diff --git a/.circleci/config.yml b/.circleci/config.yml
index e2905a42523..ea0a99bd73b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -89,7 +89,7 @@ jobs:
       - restore_cache:
           keys:
             - v8-cargo-cache-darwin-stable-{{ arch }}-{{ checksum "Cargo.lock" }}
-            - v8-cargo-cache-darwin-stable-{{ arch }}
+            # - v8-cargo-cache-darwin-stable-{{ arch }}
       - run:
           name: Install crate dependencies
           command: |
@@ -372,7 +372,6 @@ jobs:
                     -d build_parameters[CIRCLE_JOB]=bench \
                     https://circleci.com/api/v1.1/project/github/wasmerio/wasmer-bench/tree/master
             fi
-
 workflows:
   version: 2
   main:
diff --git a/Cargo.lock b/Cargo.lock
index 4a0e4d5d0a9..7edac3c951c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,13 +1,5 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-[[package]]
-name = "MacTypes-sys"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "adler32"
 version = "1.0.3"
@@ -62,8 +54,8 @@ name = "atty"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termion 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -80,8 +72,8 @@ dependencies = [
  "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -90,8 +82,8 @@ name = "backtrace-sys"
 version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -111,15 +103,15 @@ dependencies = [
  "cexpr 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "clang-sys 0.26.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashbrown 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "peeking_take_while 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -139,15 +131,6 @@ dependencies = [
  "constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "blob"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "build_const"
 version = "0.2.1"
@@ -173,7 +156,7 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bzip2-sys 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -181,8 +164,8 @@ name = "bzip2-sys"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -198,7 +181,7 @@ name = "capstone-sys"
 version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -208,24 +191,24 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cbindgen"
-version = "0.8.3"
+version = "0.8.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cc"
-version = "1.0.34"
+version = "1.0.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -250,20 +233,20 @@ version = "0.26.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "libloading 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "clap"
-version = "2.32.0"
+version = "2.33.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -278,10 +261,10 @@ dependencies = [
 
 [[package]]
 name = "cmake"
-version = "0.1.38"
+version = "0.1.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -290,22 +273,47 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "core-foundation"
-version = "0.5.1"
+name = "cookie"
+version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "core-foundation-sys"
+name = "cookie_store"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cookie 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "publicsuffix 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "try_from 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "core-foundation"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "cranelift-bforest"
 version = "0.30.0"
@@ -394,23 +402,25 @@ dependencies = [
 
 [[package]]
 name = "criterion"
-version = "0.2.10"
+version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "cast 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "criterion-plot 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "csv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "criterion-plot 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "csv 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xoshiro 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon-core 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "tinytemplate 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -418,7 +428,7 @@ dependencies = [
 
 [[package]]
 name = "criterion-plot"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -498,13 +508,13 @@ dependencies = [
 
 [[package]]
 name = "csv"
-version = "1.0.6"
+version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "csv-core 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -525,21 +535,21 @@ dependencies = [
 
 [[package]]
 name = "dtoa"
-version = "0.4.3"
+version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "dynasm"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -582,7 +592,7 @@ dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "humantime 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -592,7 +602,7 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "errno-dragonfly 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -602,7 +612,16 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "gcc 0.3.55 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "error-chain"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -619,9 +638,9 @@ name = "failure_derive"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -632,12 +651,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "filetime"
-version = "0.2.4"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.52 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -646,7 +665,7 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz_oxide_c_api 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -689,7 +708,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "futures"
-version = "0.1.26"
+version = "0.1.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -697,7 +716,7 @@ name = "futures-cpupool"
 version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -739,13 +758,13 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.1.17"
+version = "0.1.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "indexmap 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -761,7 +780,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -784,7 +803,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -802,27 +821,27 @@ dependencies = [
 
 [[package]]
 name = "hyper"
-version = "0.12.25"
+version = "0.12.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "h2 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "h2 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "want 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -833,9 +852,9 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "native-tls 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "native-tls 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -862,7 +881,7 @@ dependencies = [
  "either 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "enum-methods 0.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "inkwell_internal_macros 0.1.0 (git+https://github.com/wasmerio/inkwell?branch=llvm7-0)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "llvm-sys 70.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -871,8 +890,8 @@ name = "inkwell_internal_macros"
 version = "0.1.0"
 source = "git+https://github.com/wasmerio/inkwell?branch=llvm7-0#a14e62977504ef574dc2e933edc559cc79781ca7"
 dependencies = [
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -880,7 +899,7 @@ name = "iovec"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -894,9 +913,13 @@ dependencies = [
 
 [[package]]
 name = "itoa"
-version = "0.4.3"
+version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "kernel-net"
+version = "0.1.0"
+
 [[package]]
 name = "kernel32-sys"
 version = "0.2.2"
@@ -918,12 +941,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.51"
+version = "0.2.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libflate"
-version = "0.1.21"
+version = "0.1.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "adler32 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -936,7 +959,7 @@ name = "libloading"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -945,8 +968,8 @@ name = "linked-hash-map"
 version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_test 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_test 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -954,10 +977,10 @@ name = "llvm-sys"
 version = "70.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -983,7 +1006,7 @@ name = "lz4"
 version = "1.23.1"
 source = "git+https://github.com/zboxfs/lz4-rs.git#4704144553d827a96d4fedeb683dbde1360e06e3"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "lz4-sys 1.8.3 (git+https://github.com/zboxfs/lz4-rs.git)",
 ]
 
@@ -992,8 +1015,8 @@ name = "lz4-sys"
 version = "1.8.3"
 source = "git+https://github.com/zboxfs/lz4-rs.git#4704144553d827a96d4fedeb683dbde1360e06e3"
 dependencies = [
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1006,7 +1029,7 @@ name = "memchr"
 version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1014,7 +1037,7 @@ name = "memmap"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1023,7 +1046,7 @@ name = "memmap"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1037,7 +1060,7 @@ name = "mime"
 version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "unicase 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicase 2.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1064,9 +1087,9 @@ name = "miniz_oxide_c_api"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz_oxide 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1080,7 +1103,7 @@ dependencies = [
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1101,18 +1124,18 @@ dependencies = [
 
 [[package]]
 name = "native-tls"
-version = "0.2.2"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl 0.10.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl 0.10.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "schannel 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1122,7 +1145,7 @@ version = "0.2.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1132,9 +1155,9 @@ version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1144,9 +1167,9 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1182,20 +1205,25 @@ name = "num_cpus"
 version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "numtoa"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "openssl"
-version = "0.10.20"
+version = "0.10.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1205,13 +1233,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.43"
+version = "0.9.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1237,7 +1265,7 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1255,7 +1283,7 @@ name = "parking_lot_core"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1328,12 +1356,24 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.27"
+version = "0.4.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "publicsuffix"
+version = "1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "error-chain 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "quick-error"
 version = "1.2.2"
@@ -1346,10 +1386,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "quote"
-version = "0.6.11"
+version = "0.6.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1358,7 +1398,7 @@ version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1370,12 +1410,12 @@ version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_jitter 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_jitter 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_pcg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1422,10 +1462,10 @@ dependencies = [
 
 [[package]]
 name = "rand_jitter"
-version = "0.1.3"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1437,7 +1477,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1475,7 +1515,7 @@ version = "6.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1496,7 +1536,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-deque 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1510,7 +1550,7 @@ dependencies = [
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.52"
+version = "0.1.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1518,12 +1558,12 @@ name = "redox_termios"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "redox_syscall 0.1.52 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex"
-version = "1.1.5"
+version = "1.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aho-corasick 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1551,28 +1591,31 @@ dependencies = [
 
 [[package]]
 name = "reqwest"
-version = "0.9.13"
+version = "0.9.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cookie 0.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cookie_store 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "encoding_rs 0.8.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "flate2 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper-tls 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime_guess 2.0.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "native-tls 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "native-tls 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_urlencoded 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_urlencoded 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "uuid 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1594,12 +1637,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rmp 0.8.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rustc-demangle"
-version = "0.1.13"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1612,7 +1655,7 @@ dependencies = [
 
 [[package]]
 name = "ryu"
-version = "0.2.7"
+version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1651,30 +1694,28 @@ name = "scroll_derive"
 version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "security-framework"
-version = "0.2.2"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "core-foundation 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework-sys 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework-sys 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "security-framework-sys"
-version = "0.2.3"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "MacTypes-sys 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "core-foundation-sys 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1692,10 +1733,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.90"
+version = "1.0.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1704,7 +1745,7 @@ version = "0.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1712,17 +1753,17 @@ name = "serde_bytes"
 version = "0.10.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.90"
+version = "1.0.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1730,27 +1771,27 @@ name = "serde_json"
 version = "1.0.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_test"
-version = "1.0.90"
+version = "1.0.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_urlencoded"
-version = "0.5.4"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "dtoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dtoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1781,7 +1822,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "strsim"
-version = "0.7.0"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1789,7 +1830,7 @@ name = "structopt"
 version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "structopt-derive 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1799,9 +1840,9 @@ version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1816,11 +1857,11 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "0.15.30"
+version = "0.15.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1837,9 +1878,9 @@ name = "synstructure"
 version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1850,12 +1891,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "tar"
-version = "0.4.22"
+version = "0.4.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "filetime 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.52 (registry+https://github.com/rust-lang/crates.io-index)",
+ "filetime 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "xattr 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1884,9 +1925,9 @@ version = "3.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.52 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1901,17 +1942,18 @@ dependencies = [
 
 [[package]]
 name = "termion"
-version = "1.5.1"
+version = "1.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.52 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "textwrap"
-version = "0.10.0"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1930,8 +1972,8 @@ name = "time"
 version = "0.1.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.52 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1940,24 +1982,25 @@ name = "tinytemplate"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tokio"
-version = "0.1.18"
+version = "0.1.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-current-thread 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-trace-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1967,7 +2010,7 @@ name = "tokio-current-thread"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1977,7 +2020,7 @@ version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1986,7 +2029,7 @@ version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1996,7 +2039,7 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2005,16 +2048,16 @@ dependencies = [
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-sync 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-sync 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tokio-sync"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2023,7 +2066,7 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2032,13 +2075,13 @@ dependencies = [
 
 [[package]]
 name = "tokio-threadpool"
-version = "0.1.13"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-deque 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-queue 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2052,7 +2095,7 @@ version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2070,7 +2113,7 @@ name = "toml"
 version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2078,6 +2121,14 @@ name = "try-lock"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "try_from"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "typenum"
 version = "1.10.0"
@@ -2098,7 +2149,7 @@ dependencies = [
 
 [[package]]
 name = "unicase"
-version = "2.3.0"
+version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2188,8 +2239,8 @@ name = "wabt"
 version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "wabt-sys 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2199,8 +2250,8 @@ name = "wabt-sys"
 version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
- "cmake 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cmake 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2219,7 +2270,7 @@ name = "want"
 version = "0.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "try-lock 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2228,6 +2279,7 @@ dependencies = [
 name = "wasmer"
 version = "0.4.1"
 dependencies = [
+ "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "errno 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashbrown 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2236,6 +2288,7 @@ dependencies = [
  "wabt 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-clif-backend 0.4.1",
  "wasmer-emscripten 0.4.1",
+ "wasmer-kernel-loader 0.1.0",
  "wasmer-llvm-backend 0.4.1",
  "wasmer-middleware-common 0.4.1",
  "wasmer-runtime 0.4.1",
@@ -2255,13 +2308,13 @@ dependencies = [
  "cranelift-native 0.30.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cranelift-wasm 0.30.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashbrown 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde-bench 0.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_bytes 0.10.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
  "target-lexicon 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-runtime-core 0.4.1",
  "wasmer-win-exception-handler 0.4.1",
@@ -2276,7 +2329,7 @@ dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
  "wabt 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2286,19 +2339,27 @@ dependencies = [
  "wasmer-singlepass-backend 0.4.1",
 ]
 
+[[package]]
+name = "wasmer-kernel-loader"
+version = "0.1.0"
+dependencies = [
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasmer-runtime-core 0.4.1",
+]
+
 [[package]]
 name = "wasmer-llvm-backend"
 version = "0.4.1"
 dependencies = [
  "capstone 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.36 (registry+https://github.com/rust-lang/crates.io-index)",
  "goblin 0.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashbrown 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "inkwell 0.1.0 (git+https://github.com/wasmerio/inkwell?branch=llvm7-0)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2318,7 +2379,7 @@ dependencies = [
 name = "wasmer-runtime"
 version = "0.4.1"
 dependencies = [
- "criterion 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "criterion 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memmap 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2335,21 +2396,21 @@ version = "0.4.1"
 dependencies = [
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashbrown 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "tar 0.4.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tar 0.4.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-runtime-core 0.4.1",
  "wasmparser 0.29.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "zbox 0.6.1 (git+https://github.com/wasmerio/zbox?branch=bundle-libsodium)",
- "zstd 0.4.22+zstd.1.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "zstd 0.4.24+zstd.1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "wasmer-runtime-c-api"
 version = "0.4.1"
 dependencies = [
- "cbindgen 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cbindgen 0.8.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-runtime 0.4.1",
  "wasmer-runtime-core 0.4.1",
 ]
@@ -2366,15 +2427,15 @@ dependencies = [
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "indexmap 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "page_size 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde-bench 0.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_bytes 0.10.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmparser 0.29.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2385,11 +2446,11 @@ name = "wasmer-singlepass-backend"
 version = "0.4.1"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "dynasm 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dynasm 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "dynasmrt 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashbrown 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-runtime-core 0.4.1",
@@ -2414,7 +2475,7 @@ dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "generational-arena 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hashbrown 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-runtime-core 0.4.1",
@@ -2425,9 +2486,9 @@ name = "wasmer-win-exception-handler"
 version = "0.4.1"
 dependencies = [
  "bindgen 0.46.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "cmake 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cmake 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasmer-runtime-core 0.4.1",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2443,7 +2504,7 @@ version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2506,74 +2567,72 @@ name = "xattr"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "zbox"
 version = "0.6.1"
-source = "git+https://github.com/wasmerio/zbox?branch=bundle-libsodium#113c62bf3f94124c4978959043efcf98222fa626"
+source = "git+https://github.com/wasmerio/zbox?branch=bundle-libsodium#2636be2907eddfdaa23e1cd385416e804663a2dd"
 dependencies = [
  "android_logger 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libflate 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libflate 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "lz4 1.23.1 (git+https://github.com/zboxfs/lz4-rs.git)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "reqwest 0.9.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "reqwest 0.9.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "rmp-serde 0.13.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
- "tar 0.4.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -2837,7 +2901,7 @@ dependencies = [
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 "checksum zbox 0.6.1 (git+https://github.com/wasmerio/zbox?branch=bundle-libsodium)" = "<none>"
-"checksum zip 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1cbbddef6339155bc4fa8e2609040078ff18f3011117b55caa9f0516d544a357"
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diff --git a/Cargo.toml b/Cargo.toml
index 5de0f17ee41..408ccfa376c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,6 +19,7 @@ include = [
 ]
 
 [dependencies]
+byteorder = "1.3.1"
 errno = "0.2.4"
 structopt = "0.2.11"
 wabt = "0.7.2"
@@ -32,9 +33,10 @@ wasmer-runtime-core = { path = "lib/runtime-core" }
 wasmer-emscripten = { path = "lib/emscripten" }
 wasmer-llvm-backend = { path = "lib/llvm-backend", optional = true }
 wasmer-wasi = { path = "lib/wasi", optional = true }
+wasmer-kernel-loader = { path = "lib/kernel-loader", optional = true }
 
 [workspace]
-members = ["lib/clif-backend", "lib/singlepass-backend", "lib/runtime", "lib/runtime-abi", "lib/runtime-core", "lib/emscripten", "lib/spectests", "lib/win-exception-handler", "lib/runtime-c-api", "lib/llvm-backend", "lib/wasi", "lib/middleware-common", "examples/plugin-for-example"]
+members = ["lib/clif-backend", "lib/singlepass-backend", "lib/runtime", "lib/runtime-abi", "lib/runtime-core", "lib/emscripten", "lib/spectests", "lib/win-exception-handler", "lib/runtime-c-api", "lib/llvm-backend", "lib/wasi", "lib/middleware-common", "lib/kernel-loader", "lib/kernel-net", "examples/plugin-for-example"]
 
 [build-dependencies]
 wabt = "0.7.2"
@@ -43,6 +45,7 @@ rustc_version = "0.2.3"
 
 [features]
 default = ["fast-tests", "wasi"]
+"loader:kernel" = ["wasmer-kernel-loader"]
 debug = ["wasmer-runtime-core/debug"]
 extra-debug = ["wasmer-clif-backend/debug", "wasmer-runtime-core/debug"]
 # This feature will allow cargo test to run much faster
diff --git a/Makefile b/Makefile
index 06e66e7356c..d598e422016 100644
--- a/Makefile
+++ b/Makefile
@@ -67,13 +67,13 @@ test-emscripten-singlepass:
 	cargo test --manifest-path lib/emscripten/Cargo.toml --features singlepass -- --test-threads=1 $(runargs)
 
 singlepass-debug-release:
-	cargo +nightly build --features "backend:singlepass debug" --release
+	cargo +nightly build --features backend:singlepass,debug --release
 
 singlepass-release:
-	cargo +nightly build --features "backend:singlepass" --release
+	cargo +nightly build --features backend:singlepass --release
 
 singlepass-build:
-	cargo +nightly build --features "backend:singlepass debug"
+	cargo +nightly build --features backend:singlepass,debug
 
 release:
 	# If you are in OS-X, you will need mingw-w64 for cross compiling to windows
@@ -81,13 +81,13 @@ release:
 	cargo build --release
 
 production-release:
-	cargo build --release --features backend:singlepass,backend:llvm
+	cargo build --release --features backend:singlepass,backend:llvm,loader:kernel
 
 debug-release:
-	cargo build --release --features "debug"
+	cargo build --release --features debug
 
 extra-debug-release:
-	cargo build --release --features "extra-debug"
+	cargo build --release --features extra-debug
 
 publish-release:
 	ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} -delete ${VERSION} ./artifacts/
diff --git a/examples/echo-server/Cargo.lock b/examples/echo-server/Cargo.lock
new file mode 100644
index 00000000000..87e71d056e3
--- /dev/null
+++ b/examples/echo-server/Cargo.lock
@@ -0,0 +1,13 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "echo-server"
+version = "0.1.0"
+dependencies = [
+ "kernel-net 0.1.0",
+]
+
+[[package]]
+name = "kernel-net"
+version = "0.1.0"
+
diff --git a/examples/echo-server/Cargo.toml b/examples/echo-server/Cargo.toml
new file mode 100644
index 00000000000..68643e4cd70
--- /dev/null
+++ b/examples/echo-server/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "echo-server"
+version = "0.1.0"
+authors = ["Heyang Zhou <zhy20000919@hotmail.com>"]
+edition = "2018"
+
+[workspace]
+
+[dependencies]
+kernel-net = { path = "../../lib/kernel-net" }
\ No newline at end of file
diff --git a/examples/echo-server/src/main.rs b/examples/echo-server/src/main.rs
new file mode 100644
index 00000000000..93bacc09a1d
--- /dev/null
+++ b/examples/echo-server/src/main.rs
@@ -0,0 +1,49 @@
+#![feature(wasi_ext)]
+
+use kernel_net::{schedule, Epoll, Tcp4Listener, TcpStream};
+use std::sync::Arc;
+
+fn do_echo(stream: Arc<TcpStream>, buf: Vec<u8>) {
+    let stream2 = stream.clone();
+    stream.read_async(buf, move |result| match result {
+        Ok(buf) => {
+            if buf.len() == 0 {
+                return;
+            }
+            let stream = stream2.clone();
+            stream2.write_all_async(buf, move |result| match result {
+                Ok(buf) => {
+                    schedule(|| {
+                        do_echo(stream, buf);
+                    });
+                }
+                Err(code) => {
+                    println!("failed to write; code = {}", code);
+                }
+            });
+        }
+        Err(code) => {
+            println!("failed to read; code = {}", code);
+        }
+    });
+}
+
+fn main() {
+    let epoll = Arc::new(Epoll::new());
+    let listener = Arc::new(Tcp4Listener::new("0.0.0.0", 2001, 128).unwrap());
+
+    listener.accept_async(epoll.clone(), |stream| match stream {
+        Ok(stream) => {
+            do_echo(stream, Vec::with_capacity(16384));
+            Ok(())
+        }
+        Err(code) => {
+            println!("failed to accept; code = {}", code);
+            Err(())
+        }
+    });
+    println!("start epoll");
+    unsafe {
+        epoll.run();
+    }
+}
diff --git a/examples/http-server/Cargo.lock b/examples/http-server/Cargo.lock
new file mode 100644
index 00000000000..4b927b8e98d
--- /dev/null
+++ b/examples/http-server/Cargo.lock
@@ -0,0 +1,13 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "http-server"
+version = "0.1.0"
+dependencies = [
+ "kernel-net 0.1.0",
+]
+
+[[package]]
+name = "kernel-net"
+version = "0.1.0"
+
diff --git a/examples/http-server/Cargo.toml b/examples/http-server/Cargo.toml
new file mode 100644
index 00000000000..f394f7f5d66
--- /dev/null
+++ b/examples/http-server/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "http-server"
+version = "0.1.0"
+authors = ["Heyang Zhou <zhy20000919@hotmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[workspace]
+
+[dependencies]
+kernel-net = { path = "../../lib/kernel-net" }
diff --git a/examples/http-server/src/main.rs b/examples/http-server/src/main.rs
new file mode 100644
index 00000000000..12ba4615126
--- /dev/null
+++ b/examples/http-server/src/main.rs
@@ -0,0 +1,72 @@
+#![feature(wasi_ext)]
+
+use kernel_net::{schedule, Epoll, Tcp4Listener, TcpStream};
+use std::sync::Arc;
+
+fn serve(stream: Arc<TcpStream>, mut all: Vec<u8>) {
+    let stream2 = stream.clone();
+    stream.read_async(
+        Vec::with_capacity(512),
+        move |result| {
+            match result {
+                Ok(buf) => {
+                    if buf.len() == 0 {
+                        return;
+                    }
+                    all.extend_from_slice(&buf);
+                    if all.len() > 4096 {
+                        println!("header too large");
+                        return;
+                    }
+                    let s = match ::std::str::from_utf8(&all) {
+                        Ok(x) => x,
+                        Err(e) => {
+                            println!("not utf8: {:?}", e);
+                            return;
+                        }
+                    };
+                    if let Some(_pos) = s.find("\r\n\r\n") {
+                        let body = format!(
+                            "Hello, world!\n",
+                        ).into_bytes();
+                        let stream = stream2.clone();
+                        stream2.write_all_async(
+                            format!(
+                                "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nConnection: close\r\nContent-Length: {}\r\n\r\n",
+                                body.len()
+                            ).into_bytes(),
+                            |_| {
+                                stream.write_all_async(body, |_| {});
+                            }
+                        );
+                    } else {
+                        schedule(|| serve(stream2, all));
+                    }
+                }
+                Err(code) => {
+                    println!("failed to read; code = {}", code);
+                }
+            }
+        }
+    );
+}
+
+fn main() {
+    let epoll = Arc::new(Epoll::new());
+    let listener = Arc::new(Tcp4Listener::new("0.0.0.0", 2011, 128).unwrap());
+
+    listener.accept_async(epoll.clone(), |stream| match stream {
+        Ok(stream) => {
+            serve(stream, vec![]);
+            Ok(())
+        }
+        Err(code) => {
+            println!("failed to accept; code = {}", code);
+            Err(())
+        }
+    });
+    println!("start epoll");
+    unsafe {
+        epoll.run();
+    }
+}
diff --git a/examples/pipe/Cargo.toml b/examples/pipe/Cargo.toml
new file mode 100644
index 00000000000..3dec721486a
--- /dev/null
+++ b/examples/pipe/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "pipe"
+version = "0.1.0"
+authors = ["Heyang Zhou <zhy20000919@hotmail.com>"]
+edition = "2018"
+
+[workspace]
+
+[dependencies]
diff --git a/examples/pipe/src/main.rs b/examples/pipe/src/main.rs
new file mode 100644
index 00000000000..5192c539ae3
--- /dev/null
+++ b/examples/pipe/src/main.rs
@@ -0,0 +1,13 @@
+use std::io::{Read, Write};
+
+fn main() {
+    let mut stdin = ::std::io::stdin();
+    let mut stdout = ::std::io::stdout();
+    let mut buf: Vec<u8> = vec![0; 512];
+    let mut total: u64 = 0;
+    while total < 1048576u64 * 2048 {
+        let n = stdin.read(&mut buf).unwrap();
+        stdout.write_all(&buf[..n]).unwrap();
+        total += n as u64;
+    }
+}
diff --git a/lib/kernel-loader/Cargo.toml b/lib/kernel-loader/Cargo.toml
new file mode 100644
index 00000000000..921e71f9ab7
--- /dev/null
+++ b/lib/kernel-loader/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "wasmer-kernel-loader"
+version = "0.1.0"
+authors = ["Heyang Zhou <zhy20000919@hotmail.com>"]
+edition = "2018"
+
+[dependencies]
+libc = "0.2.49"
+wasmer-runtime-core = { path = "../runtime-core" }
diff --git a/lib/kernel-loader/src/lib.rs b/lib/kernel-loader/src/lib.rs
new file mode 100644
index 00000000000..8abc850af33
--- /dev/null
+++ b/lib/kernel-loader/src/lib.rs
@@ -0,0 +1,168 @@
+pub mod service;
+
+use service::{ImportInfo, LoadProfile, RunProfile, ServiceContext, TableEntryRequest};
+use wasmer_runtime_core::{
+    backend::RunnableModule,
+    loader::{Instance, Loader},
+    module::ModuleInfo,
+    structures::TypedIndex,
+    types::{
+        FuncIndex, ImportedMemoryIndex, ImportedTableIndex, LocalMemoryIndex, LocalTableIndex,
+        Value,
+    },
+    vm::{Anyfunc, Ctx, LocalGlobal, SigId},
+};
+
+pub struct KernelLoader;
+
+impl Loader for KernelLoader {
+    type Instance = KernelInstance;
+    type Error = String;
+
+    fn load(
+        &self,
+        rm: &dyn RunnableModule,
+        module: &ModuleInfo,
+        full_ctx: &Ctx,
+    ) -> Result<Self::Instance, Self::Error> {
+        let ctx = &full_ctx.internal;
+        let code = rm.get_code().unwrap();
+        let memory = if let Some(_) = module.memories.get(LocalMemoryIndex::new(0)) {
+            Some(unsafe {
+                ::std::slice::from_raw_parts((**ctx.memories).base, (**ctx.memories).bound)
+            })
+        } else if let Some(_) = module.imported_memories.get(ImportedMemoryIndex::new(0)) {
+            return Err("imported memory is not supported".into());
+        } else {
+            None
+        };
+        let table: Option<Vec<TableEntryRequest>> =
+            if let Some(_) = module.tables.get(LocalTableIndex::new(0)) {
+                Some(unsafe {
+                    let table = &**ctx.tables;
+                    let elements: &[Anyfunc];
+                    #[allow(clippy::cast_ptr_alignment)]
+                    {
+                        elements =
+                            ::std::slice::from_raw_parts(table.base as *const Anyfunc, table.count);
+                    }
+
+                    let base_addr = code.as_ptr() as usize;
+                    let end_addr = base_addr + code.len();
+                    elements
+                        .iter()
+                        .map(|x| {
+                            let func_addr = x.func as usize;
+                            TableEntryRequest {
+                                offset: if x.func.is_null()
+                                    || func_addr < base_addr
+                                    || func_addr >= end_addr
+                                {
+                                    ::std::usize::MAX
+                                } else {
+                                    x.func as usize - base_addr
+                                },
+                                sig_id: x.sig_id.0,
+                            }
+                        })
+                        .collect()
+                })
+            } else if let Some(_) = module.imported_tables.get(ImportedTableIndex::new(0)) {
+                return Err("imported table is not supported".into());
+            } else {
+                None
+            };
+        if module.imported_globals.len() > 0 {
+            return Err("imported globals are not supported".into());
+        }
+        let globals: Vec<u64> = unsafe {
+            let globals: &[*mut LocalGlobal] =
+                ::std::slice::from_raw_parts(ctx.globals, module.globals.len());
+            globals.iter().map(|x| (**x).data).collect()
+        };
+        let mut import_names: Vec<ImportInfo> = vec![];
+        for (idx, import) in &module.imported_functions {
+            let name = format!(
+                "{}##{}",
+                module.namespace_table.get(import.namespace_index),
+                module.name_table.get(import.name_index)
+            );
+            let sig = module
+                .signatures
+                .get(*module.func_assoc.get(FuncIndex::new(idx.index())).unwrap())
+                .unwrap();
+            import_names.push(ImportInfo {
+                name: name,
+                param_count: sig.params().len(),
+            });
+        }
+        let dynamic_sigindices: &[u32] = unsafe {
+            ::std::mem::transmute::<&[SigId], &[u32]>(::std::slice::from_raw_parts(
+                ctx.dynamic_sigindices,
+                full_ctx.dynamic_sigindice_count(),
+            ))
+        };
+        let param_counts: Vec<usize> = (0..module.func_assoc.len())
+            .map(|x| {
+                module
+                    .signatures
+                    .get(*module.func_assoc.get(FuncIndex::new(x)).unwrap())
+                    .unwrap()
+                    .params()
+                    .len()
+            })
+            .collect();
+        let profile = LoadProfile {
+            code: code,
+            memory: memory,
+            memory_max: 0,
+            globals: &globals,
+            imports: &import_names,
+            dynamic_sigindices: dynamic_sigindices,
+            table: table.as_ref().map(|x| x.as_slice()),
+        };
+        let sc = ServiceContext::new(profile).map_err(|x| format!("{:?}", x))?;
+        Ok(KernelInstance {
+            context: sc,
+            offsets: rm.get_offsets().unwrap(),
+            param_counts: param_counts,
+        })
+    }
+}
+
+pub struct KernelInstance {
+    context: ServiceContext,
+    offsets: Vec<usize>,
+    param_counts: Vec<usize>, // FIXME: Full signature check
+}
+
+impl Instance for KernelInstance {
+    type Error = String;
+    fn call(&mut self, id: usize, args: &[Value]) -> Result<u64, String> {
+        if args.len() != self.param_counts[id] {
+            return Err("param count mismatch".into());
+        }
+        let args: Vec<u64> = args.iter().map(|x| x.to_u64()).collect();
+
+        let ret = self
+            .context
+            .run_code(RunProfile {
+                entry_offset: self.offsets[id] as u32,
+                params: &args,
+            })
+            .map_err(|x| format!("{:?}", x))?;
+        Ok(ret)
+    }
+
+    fn read_memory(&mut self, offset: u32, len: u32) -> Result<Vec<u8>, String> {
+        self.context
+            .read_memory(offset, len)
+            .map_err(|x| format!("{:?}", x))
+    }
+
+    fn write_memory(&mut self, offset: u32, len: u32, buf: &[u8]) -> Result<(), String> {
+        self.context
+            .write_memory(offset, len, buf)
+            .map_err(|x| format!("{:?}", x))
+    }
+}
diff --git a/lib/kernel-loader/src/service.rs b/lib/kernel-loader/src/service.rs
new file mode 100644
index 00000000000..45ccdd869be
--- /dev/null
+++ b/lib/kernel-loader/src/service.rs
@@ -0,0 +1,255 @@
+use std::error::Error;
+use std::fs::File;
+use std::io;
+use std::os::unix::io::AsRawFd;
+
+macro_rules! impl_debug_display {
+    ($target:ident) => {
+        impl ::std::fmt::Display for $target {
+            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+                <Self as ::std::fmt::Debug>::fmt(self, f)
+            }
+        }
+    };
+}
+
+#[repr(i32)]
+pub enum Command {
+    LoadCode = 0x1001,
+    RunCode = 0x1002,
+    ReadMemory = 0x1003,
+    WriteMemory = 0x1004,
+}
+
+#[derive(Debug)]
+pub enum ServiceError {
+    Io(io::Error),
+    Code(i32),
+    InvalidInput,
+    Rejected,
+}
+
+pub type ServiceResult<T> = Result<T, ServiceError>;
+
+impl_debug_display!(ServiceError);
+
+impl Error for ServiceError {
+    fn description(&self) -> &str {
+        "ServiceError"
+    }
+}
+
+impl From<io::Error> for ServiceError {
+    fn from(other: io::Error) -> ServiceError {
+        ServiceError::Io(other)
+    }
+}
+
+#[repr(C)]
+struct LoadCodeRequest {
+    code: *const u8,
+    code_len: u32,
+    memory: *const u8,
+    memory_len: u32,
+    memory_max: u32,
+    table: *const TableEntryRequest,
+    table_count: u32,
+    globals: *const u64,
+    global_count: u32,
+
+    imported_funcs: *const ImportRequest,
+    imported_func_count: u32,
+
+    dynamic_sigindices: *const u32,
+    dynamic_sigindice_count: u32,
+}
+
+#[repr(C)]
+struct RunCodeRequest {
+    entry_offset: u32,
+    params: *const u64,
+    param_count: u32,
+    result: *mut RunCodeResult,
+}
+
+#[repr(C)]
+struct RunCodeResult {
+    success: u32,
+    retval: u64,
+}
+
+#[repr(C)]
+struct ReadMemoryRequest {
+    out: *mut u8,
+    offset: u32,
+    len: u32,
+}
+
+#[repr(C)]
+struct WriteMemoryRequest {
+    _in: *const u8,
+    offset: u32,
+    len: u32,
+}
+
+#[repr(C)]
+struct ImportRequest {
+    name: [u8; 64],
+    param_count: u32,
+}
+
+#[repr(C)]
+pub struct TableEntryRequest {
+    pub offset: usize,
+    pub sig_id: u32,
+}
+
+pub struct LoadProfile<'a> {
+    pub code: &'a [u8],
+    pub memory: Option<&'a [u8]>,
+    pub memory_max: usize,
+    pub globals: &'a [u64],
+    pub imports: &'a [ImportInfo],
+    pub dynamic_sigindices: &'a [u32],
+    pub table: Option<&'a [TableEntryRequest]>,
+}
+
+pub struct ImportInfo {
+    pub name: String,
+    pub param_count: usize,
+}
+
+pub struct RunProfile<'a> {
+    pub entry_offset: u32,
+    pub params: &'a [u64],
+}
+
+pub struct ServiceContext {
+    dev: File,
+}
+
+impl ServiceContext {
+    pub fn new(load: LoadProfile) -> ServiceResult<ServiceContext> {
+        let dev = File::open("/dev/wasmctl")?;
+        let imports: Vec<ImportRequest> = load
+            .imports
+            .iter()
+            .map(|x| {
+                let mut req = ImportRequest {
+                    name: [0u8; 64],
+                    param_count: x.param_count as u32,
+                };
+                let name = x.name.as_bytes();
+                let mut count = req.name.len() - 1;
+                if name.len() < count {
+                    count = name.len();
+                }
+                req.name[..count].copy_from_slice(&name[..count]);
+                req
+            })
+            .collect();
+        let req = LoadCodeRequest {
+            code: load.code.as_ptr(),
+            code_len: load.code.len() as u32,
+            memory: load
+                .memory
+                .map(|x| x.as_ptr())
+                .unwrap_or(::std::ptr::null()),
+            memory_len: load.memory.map(|x| x.len() as u32).unwrap_or(0),
+            memory_max: load.memory_max as u32,
+            table: load.table.map(|x| x.as_ptr()).unwrap_or(::std::ptr::null()),
+            table_count: load.table.map(|x| x.len() as u32).unwrap_or(0),
+            globals: load.globals.as_ptr(),
+            global_count: load.globals.len() as u32,
+            imported_funcs: imports.as_ptr(),
+            imported_func_count: imports.len() as u32,
+            dynamic_sigindices: load.dynamic_sigindices.as_ptr(),
+            dynamic_sigindice_count: load.dynamic_sigindices.len() as u32,
+        };
+        let fd = dev.as_raw_fd();
+        let ret = unsafe {
+            ::libc::ioctl(
+                fd,
+                Command::LoadCode as i32 as ::libc::c_ulong,
+                &req as *const _ as ::libc::c_ulong,
+            )
+        };
+        if ret != 0 {
+            Err(ServiceError::Code(ret))
+        } else {
+            Ok(ServiceContext { dev: dev })
+        }
+    }
+
+    pub fn run_code(&mut self, run: RunProfile) -> ServiceResult<u64> {
+        let mut result: RunCodeResult = unsafe { ::std::mem::zeroed() };
+        let mut req = RunCodeRequest {
+            entry_offset: run.entry_offset,
+            params: run.params.as_ptr(),
+            param_count: run.params.len() as u32,
+            result: &mut result,
+        };
+        let fd = self.dev.as_raw_fd();
+        let err = unsafe {
+            ::libc::ioctl(
+                fd,
+                Command::RunCode as i32 as ::libc::c_ulong,
+                &mut req as *mut _ as ::libc::c_ulong,
+            )
+        };
+        if err < 0 {
+            Err(ServiceError::Code(err))
+        } else if result.success == 0 {
+            println!("Rejected {} {}", result.success, result.retval);
+            Err(ServiceError::Rejected)
+        } else {
+            Ok(result.retval)
+        }
+    }
+
+    pub fn read_memory(&mut self, offset: u32, len: u32) -> ServiceResult<Vec<u8>> {
+        let fd = self.dev.as_raw_fd();
+        let mut ret = Vec::with_capacity(len as usize);
+        unsafe {
+            ret.set_len(len as usize);
+        }
+        let req = ReadMemoryRequest {
+            out: ret.as_mut_ptr(),
+            offset: offset,
+            len: len,
+        };
+        let err = unsafe {
+            ::libc::ioctl(
+                fd,
+                Command::ReadMemory as i32 as ::libc::c_ulong,
+                &req as *const _ as ::libc::c_ulong,
+            )
+        };
+        if err < 0 {
+            Err(ServiceError::Code(err))
+        } else {
+            Ok(ret)
+        }
+    }
+
+    pub fn write_memory(&mut self, offset: u32, len: u32, buf: &[u8]) -> ServiceResult<()> {
+        let fd = self.dev.as_raw_fd();
+        let req = WriteMemoryRequest {
+            _in: buf.as_ptr(),
+            offset: offset,
+            len: len,
+        };
+        let err = unsafe {
+            ::libc::ioctl(
+                fd,
+                Command::WriteMemory as i32 as ::libc::c_ulong,
+                &req as *const _ as ::libc::c_ulong,
+            )
+        };
+        if err < 0 {
+            Err(ServiceError::Code(err))
+        } else {
+            Ok(())
+        }
+    }
+}
diff --git a/lib/kernel-net/Cargo.toml b/lib/kernel-net/Cargo.toml
new file mode 100644
index 00000000000..28db6bf4d4f
--- /dev/null
+++ b/lib/kernel-net/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "kernel-net"
+version = "0.1.0"
+authors = ["Heyang Zhou <zhy20000919@hotmail.com>"]
+edition = "2018"
+
+[dependencies]
+#runtime = "0.3.0-alpha.4"
+#runtime-raw = "0.3.0-alpha.3"
diff --git a/lib/kernel-net/src/lib.rs b/lib/kernel-net/src/lib.rs
new file mode 100644
index 00000000000..98746a68f95
--- /dev/null
+++ b/lib/kernel-net/src/lib.rs
@@ -0,0 +1,466 @@
+#![cfg(all(target_arch = "wasm32", target_os = "wasi"))]
+#![feature(wasi_ext)]
+
+use std::cell::RefCell;
+use std::fs::File;
+use std::net::{AddrParseError, Ipv4Addr};
+use std::os::wasi::io::FromRawFd;
+use std::sync::{Arc, Mutex};
+
+const AF_INET: i32 = 2;
+const SOCK_STREAM: i32 = 1;
+const O_NONBLOCK: u32 = 2048;
+const F_GETFL: i32 = 3;
+const F_SETFL: i32 = 4;
+const EPOLLIN: u32 = 1u32;
+const EPOLLOUT: u32 = 4u32;
+const EPOLLONESHOT: u32 = 1u32 << 30;
+const EPOLLET: u32 = 1u32 << 31;
+const EAGAIN: i32 = 11;
+const EWOULDBLOCK: i32 = EAGAIN;
+const EPOLL_CTL_ADD: i32 = 1;
+const EPOLL_CTL_DEL: i32 = 2;
+
+#[link(wasm_import_module = "net")]
+extern "C" {
+    fn _socket(family: i32, _type: i32, proto: i32) -> i32;
+    fn _bind(fd: i32, sa: *const SockaddrIn, sa_len: usize) -> i32;
+    fn _listen(fd: i32, backlog: i32) -> i32;
+    fn _accept4(fd: i32, sa: *mut SockaddrIn, sa_len: *mut usize, flags: u32) -> i32;
+    fn _sendto(
+        fd: i32,
+        buf: *const u8,
+        buf_len: usize,
+        flags: u32,
+        addr: *const SockaddrIn,
+        addr_len: usize,
+    ) -> i32;
+    fn _recvfrom(
+        fd: i32,
+        buf: *mut u8,
+        buf_len: usize,
+        flags: u32,
+        addr: *mut SockaddrIn,
+        addr_len: *mut usize,
+    ) -> i32;
+    fn _eventfd_sem(initial: u32) -> i32;
+    fn _epoll_create() -> i32;
+    fn _epoll_ctl(epfd: i32, op: i32, fd: i32, event: *const EpollEvent) -> i32;
+    fn _epoll_wait(epfd: i32, events: *mut EpollEvent, maxevents: usize, timeout: i32) -> i32;
+    fn _fcntl(fd: i32, cmd: i32, arg: u32) -> i32;
+}
+
+thread_local! {
+    static GLOBAL_EPOLL: RefCell<Option<Arc<Epoll>>> = RefCell::new(None);
+    static ASYNC_STATE_POOL: RefCell<Vec<Box<AsyncState>>> = RefCell::new(Vec::new());
+}
+
+#[derive(Default)]
+struct AsyncState {
+    callback: Option<Box<FnOnce()>>,
+    _epoll: Option<Arc<Epoll>>,
+}
+
+pub struct Epoll {
+    fd: i32,
+    imm_queue: Mutex<Vec<Box<FnOnce()>>>,
+}
+
+impl Epoll {
+    pub fn new() -> Epoll {
+        let fd = unsafe { _epoll_create() };
+        assert!(fd >= 0);
+        Epoll {
+            fd: fd,
+            imm_queue: Mutex::new(Vec::new()),
+        }
+    }
+
+    pub fn schedule<F: FnOnce() + 'static>(&self, f: F) {
+        self.imm_queue.lock().unwrap().push(Box::new(f));
+    }
+
+    pub unsafe fn run(self: Arc<Self>) -> ! {
+        GLOBAL_EPOLL.with(|x| {
+            *x.borrow_mut() = Some(self.clone());
+        });
+        let mut events: Vec<EpollEvent> = vec![EpollEvent::default(); 32];
+        loop {
+            loop {
+                let imm_queue =
+                    ::std::mem::replace(&mut *self.imm_queue.lock().unwrap(), Vec::new());
+                if imm_queue.len() == 0 {
+                    break;
+                }
+                for f in imm_queue {
+                    f();
+                }
+            }
+            let events_len = events.len();
+            let n_ready = _epoll_wait(self.fd, events.as_mut_ptr(), events_len, -1);
+            assert!(n_ready >= 0);
+            /*if n_ready > 1 {
+                println!("n_ready = {}", n_ready);
+            }*/
+            for ev in &events[..n_ready as usize] {
+                if ev.events & (EPOLLIN | EPOLLOUT) != 0 {
+                    //println!("Free event {:x} {:?}", ev.events, ev.data as usize as *mut AsyncState);
+                    let mut state = Box::from_raw(ev.data as usize as *mut AsyncState);
+                    (state.callback.take().unwrap())();
+                    put_async_state(state);
+                //println!("After callback");
+                } else {
+                    println!("unknown event(s): 0x{:x}", ev.events);
+                }
+            }
+        }
+    }
+}
+
+impl Drop for Epoll {
+    fn drop(&mut self) {
+        unsafe {
+            File::from_raw_fd(self.fd as _);
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug)]
+pub enum EpollDirection {
+    In,
+    Out,
+}
+
+fn get_async_state() -> Box<AsyncState> {
+    ASYNC_STATE_POOL.with(|pool| {
+        pool.borrow_mut()
+            .pop()
+            .unwrap_or_else(|| Box::new(AsyncState::default()))
+    })
+}
+
+fn put_async_state(mut x: Box<AsyncState>) {
+    x.callback = None;
+    x._epoll = None;
+    ASYNC_STATE_POOL.with(|pool| pool.borrow_mut().push(x));
+}
+
+pub fn schedule<F: FnOnce() + 'static>(f: F) {
+    //println!("schedule");
+    let epoll = GLOBAL_EPOLL.with(|x| x.borrow().as_ref().unwrap().clone());
+    epoll.schedule(f);
+}
+
+fn get_async_io_payload<
+    T: 'static,
+    P: FnMut(i32) -> Result<T, i32> + 'static,
+    F: FnOnce(Result<T, i32>) + 'static,
+>(
+    epoll: Arc<Epoll>,
+    fd: i32,
+    direction: EpollDirection,
+    poll_action: P,
+    on_ready: F,
+) -> Box<FnOnce()> {
+    __get_async_io_payload(epoll, fd, direction, poll_action, on_ready, false)
+}
+
+fn __get_async_io_payload<
+    T: 'static,
+    P: FnMut(i32) -> Result<T, i32> + 'static,
+    F: FnOnce(Result<T, i32>) + 'static,
+>(
+    epoll: Arc<Epoll>,
+    fd: i32,
+    direction: EpollDirection,
+    mut poll_action: P,
+    on_ready: F,
+    registered: bool,
+) -> Box<FnOnce()> {
+    let epfd = epoll.fd;
+    Box::new(move || {
+        //println!("async io payload");
+        let ret = poll_action(fd);
+        //println!("async io payload (after poll_action)");
+        match ret {
+            Err(x) if x == -EAGAIN || x == -EWOULDBLOCK => {
+                let mut state = get_async_state();
+                state.callback = Some(__get_async_io_payload(
+                    epoll.clone(),
+                    fd,
+                    direction,
+                    poll_action,
+                    on_ready,
+                    true,
+                ));
+                state._epoll = Some(epoll);
+                let direction_flag = match direction {
+                    EpollDirection::In => EPOLLIN,
+                    EpollDirection::Out => EPOLLOUT,
+                };
+                let ev = EpollEvent {
+                    events: direction_flag | EPOLLET | EPOLLONESHOT,
+                    data: Box::into_raw(state) as usize as _,
+                };
+                //println!("Alloc event {:?}", ev.data as usize as *mut AsyncState);
+                let ret = unsafe { _epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev) };
+                assert!(ret >= 0);
+            }
+            x => {
+                if registered {
+                    assert!(
+                        unsafe { _epoll_ctl(epfd, EPOLL_CTL_DEL, fd, ::std::ptr::null(),) } >= 0
+                    );
+                }
+                on_ready(x); // fast path
+            }
+        }
+    })
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+struct SockaddrIn {
+    sin_family: u16, // e.g. AF_INET
+    sin_port: u16,   // e.g. htons(3490)
+    sin_addr: InAddr,
+    sin_zero: [u8; 8],
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+struct InAddr {
+    s_addr: u32,
+}
+
+#[repr(C, packed)]
+#[derive(Copy, Clone, Default)]
+struct EpollEvent {
+    events: u32,
+    data: u64,
+}
+
+fn invert_byteorder_u16(x: u16) -> u16 {
+    unsafe {
+        use std::mem::transmute;
+        let buf: [u8; 2] = transmute(x);
+        let out: [u8; 2] = [buf[1], buf[0]];
+        transmute(out)
+    }
+}
+
+#[derive(Debug)]
+pub enum SocketError {
+    AddrParse(AddrParseError),
+    SocketCreate,
+    Bind,
+    Listen,
+    Accept,
+    Message(String),
+}
+
+pub struct Tcp4Listener {
+    _addr: Ipv4Addr,
+    _port: u16,
+    fd: i32,
+}
+
+impl Tcp4Listener {
+    pub fn new<A: AsRef<str>>(
+        addr: A,
+        port: u16,
+        backlog: u32,
+    ) -> Result<Tcp4Listener, SocketError> {
+        let addr: Ipv4Addr = addr.as_ref().parse().map_err(SocketError::AddrParse)?;
+        let sa = SockaddrIn {
+            sin_family: AF_INET as _,
+            sin_port: invert_byteorder_u16(port),
+            sin_addr: InAddr {
+                s_addr: unsafe { ::std::mem::transmute(addr.octets()) },
+            },
+            sin_zero: [0; 8],
+        };
+        let fd = unsafe { _socket(AF_INET, SOCK_STREAM, 0) };
+        if fd < 0 {
+            return Err(SocketError::SocketCreate);
+        }
+        if unsafe { _bind(fd, &sa, ::std::mem::size_of::<SockaddrIn>()) } < 0 {
+            return Err(SocketError::Bind);
+        }
+        if unsafe { _listen(fd, backlog as _) } < 0 {
+            return Err(SocketError::Listen);
+        }
+
+        unsafe {
+            let mut socket_flags = _fcntl(fd, F_GETFL, 0) as u32;
+            socket_flags |= O_NONBLOCK;
+            assert!(_fcntl(fd, F_SETFL, socket_flags) >= 0);
+        }
+
+        Ok(Tcp4Listener {
+            _addr: addr,
+            _port: port,
+            fd: fd,
+        })
+    }
+
+    pub fn accept_async<F: Fn(Result<Arc<TcpStream>, i32>) -> Result<(), ()> + 'static>(
+        self: Arc<Self>,
+        ep: Arc<Epoll>,
+        cb: F,
+    ) {
+        let ep2 = ep.clone();
+        (get_async_io_payload(
+            ep.clone(),
+            self.fd,
+            EpollDirection::In,
+            move |fd| -> Result<Arc<TcpStream>, i32> {
+                let mut incoming_sa: SockaddrIn = unsafe { ::std::mem::uninitialized() };
+                let mut real_len: usize = ::std::mem::size_of::<SockaddrIn>();
+                let conn = unsafe { _accept4(fd, &mut incoming_sa, &mut real_len, O_NONBLOCK) };
+                if conn >= 0 {
+                    unsafe {
+                        let mut socket_flags = _fcntl(conn, F_GETFL, 0) as u32;
+                        socket_flags |= O_NONBLOCK;
+                        assert!(_fcntl(conn, F_SETFL, socket_flags) >= 0);
+                    }
+                    Ok(Arc::new(TcpStream {
+                        fd: conn,
+                        epoll: ep.clone(),
+                    }))
+                } else {
+                    Err(conn)
+                }
+            },
+            move |x| {
+                schedule(|| {
+                    if let Ok(()) = cb(x) {
+                        self.accept_async(ep2, cb);
+                    }
+                });
+            },
+        ))();
+    }
+}
+
+pub struct TcpStream {
+    fd: i32,
+    epoll: Arc<Epoll>,
+}
+
+impl TcpStream {
+    pub fn __write_async(
+        self: Arc<Self>,
+        data: Vec<u8>,
+        offset: usize,
+        cb: impl FnOnce(Result<(usize, Vec<u8>), i32>) + 'static,
+    ) {
+        let mut data = Some(data);
+
+        (get_async_io_payload(
+            self.epoll.clone(),
+            self.fd,
+            EpollDirection::Out,
+            move |fd| -> Result<(usize, Vec<u8>), i32> {
+                let _data = data.as_ref().unwrap();
+                let _data = &_data[offset..];
+                let ret =
+                    unsafe { _sendto(fd, _data.as_ptr(), _data.len(), 0, ::std::ptr::null(), 0) };
+                if ret >= 0 {
+                    Ok((ret as usize, data.take().unwrap()))
+                } else {
+                    Err(ret)
+                }
+            },
+            move |x| {
+                drop(self);
+                cb(x);
+            },
+        ))();
+    }
+
+    pub fn write_async(
+        self: Arc<Self>,
+        data: Vec<u8>,
+        cb: impl FnOnce(Result<(usize, Vec<u8>), i32>) + 'static,
+    ) {
+        self.__write_async(data, 0, cb)
+    }
+
+    pub fn write_all_async(
+        self: Arc<Self>,
+        data: Vec<u8>,
+        cb: impl FnOnce(Result<Vec<u8>, i32>) + 'static,
+    ) {
+        fn inner(
+            me: Arc<TcpStream>,
+            data: Vec<u8>,
+            offset: usize,
+            cb: impl FnOnce(Result<Vec<u8>, i32>) + 'static,
+        ) {
+            let me2 = me.clone();
+            me.__write_async(data, offset, move |result| match result {
+                Ok((len, data)) => {
+                    let new_offset = offset + len;
+                    if new_offset == data.len() {
+                        cb(Ok(data));
+                    } else {
+                        inner(me2, data, new_offset, cb);
+                    }
+                }
+                Err(code) => {
+                    cb(Err(code));
+                }
+            })
+        }
+        inner(self, data, 0, cb);
+    }
+
+    pub fn read_async(
+        self: Arc<Self>,
+        out: Vec<u8>,
+        cb: impl FnOnce(Result<Vec<u8>, i32>) + 'static,
+    ) {
+        let mut out = Some(out);
+        (get_async_io_payload(
+            self.epoll.clone(),
+            self.fd,
+            EpollDirection::In,
+            move |fd| -> Result<Vec<u8>, i32> {
+                let _out = out.as_mut().unwrap();
+                let out_cap = _out.capacity();
+                let ret = unsafe {
+                    _recvfrom(
+                        fd,
+                        _out.as_mut_ptr(),
+                        out_cap,
+                        0,
+                        ::std::ptr::null_mut(),
+                        ::std::ptr::null_mut(),
+                    )
+                };
+                if ret >= 0 {
+                    assert!(ret as usize <= out_cap);
+                    unsafe {
+                        _out.set_len(ret as usize);
+                    }
+                    Ok(out.take().unwrap())
+                } else {
+                    Err(ret)
+                }
+            },
+            move |x| {
+                drop(self);
+                cb(x);
+            },
+        ))();
+    }
+}
+
+impl Drop for TcpStream {
+    fn drop(&mut self) {
+        unsafe {
+            File::from_raw_fd(self.fd as _);
+        }
+    }
+}
diff --git a/lib/llvm-backend/src/code.rs b/lib/llvm-backend/src/code.rs
index 028207a8c4f..8514208ad54 100644
--- a/lib/llvm-backend/src/code.rs
+++ b/lib/llvm-backend/src/code.rs
@@ -285,13 +285,16 @@ fn resolve_memory_ptr(
     ctx: &mut CtxType,
     memarg: &MemoryImmediate,
     ptr_ty: PointerType,
+    value_size: usize,
 ) -> Result<PointerValue, BinaryReaderError> {
     // Ignore alignment hint for the time being.
     let imm_offset = intrinsics.i64_ty.const_int(memarg.offset as u64, false);
+    let value_size_v = intrinsics.i64_ty.const_int(value_size as u64, false);
     let var_offset_i32 = state.pop1()?.into_int_value();
     let var_offset =
         builder.build_int_z_extend(var_offset_i32, intrinsics.i64_ty, &state.var_name());
     let effective_offset = builder.build_int_add(var_offset, imm_offset, &state.var_name());
+    let end_offset = builder.build_int_add(effective_offset, value_size_v, &state.var_name());
     let memory_cache = ctx.memory(MemoryIndex::new(0), intrinsics);
 
     let mem_base_int = match memory_cache {
@@ -306,12 +309,20 @@ fn resolve_memory_ptr(
 
             let base_as_int = builder.build_ptr_to_int(base, intrinsics.i64_ty, "base_as_int");
 
-            let base_in_bounds = builder.build_int_compare(
+            let base_in_bounds_1 = builder.build_int_compare(
+                IntPredicate::ULE,
+                end_offset,
+                bounds,
+                "base_in_bounds_1",
+            );
+            let base_in_bounds_2 = builder.build_int_compare(
                 IntPredicate::ULT,
                 effective_offset,
-                bounds,
-                "base_in_bounds",
+                end_offset,
+                "base_in_bounds_2",
             );
+            let base_in_bounds =
+                builder.build_and(base_in_bounds_1, base_in_bounds_2, "base_in_bounds");
 
             let base_in_bounds = builder
                 .build_call(
@@ -2000,6 +2011,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i32_ptr_ty,
+                    4,
                 )?;
                 let result = builder.build_load(effective_address, &state.var_name());
                 state.push1(result);
@@ -2014,6 +2026,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i64_ptr_ty,
+                    8,
                 )?;
                 let result = builder.build_load(effective_address, &state.var_name());
                 state.push1(result);
@@ -2028,6 +2041,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.f32_ptr_ty,
+                    4,
                 )?;
                 let result = builder.build_load(effective_address, &state.var_name());
                 state.push1(result);
@@ -2042,6 +2056,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.f64_ptr_ty,
+                    8,
                 )?;
                 let result = builder.build_load(effective_address, &state.var_name());
                 state.push1(result);
@@ -2058,6 +2073,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i32_ptr_ty,
+                    4,
                 )?;
                 builder.build_store(effective_address, value);
             }
@@ -2072,6 +2088,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i64_ptr_ty,
+                    8,
                 )?;
                 builder.build_store(effective_address, value);
             }
@@ -2086,6 +2103,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.f32_ptr_ty,
+                    4,
                 )?;
                 builder.build_store(effective_address, value);
             }
@@ -2100,6 +2118,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.f64_ptr_ty,
+                    8,
                 )?;
                 builder.build_store(effective_address, value);
             }
@@ -2114,6 +2133,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i8_ptr_ty,
+                    1,
                 )?;
                 let narrow_result = builder
                     .build_load(effective_address, &state.var_name())
@@ -2132,6 +2152,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i16_ptr_ty,
+                    2,
                 )?;
                 let narrow_result = builder
                     .build_load(effective_address, &state.var_name())
@@ -2150,6 +2171,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i8_ptr_ty,
+                    1,
                 )?;
                 let narrow_result = builder
                     .build_load(effective_address, &state.var_name())
@@ -2168,6 +2190,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i16_ptr_ty,
+                    2,
                 )?;
                 let narrow_result = builder
                     .build_load(effective_address, &state.var_name())
@@ -2186,6 +2209,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i32_ptr_ty,
+                    4,
                 )?;
                 let narrow_result = builder
                     .build_load(effective_address, &state.var_name())
@@ -2205,6 +2229,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i8_ptr_ty,
+                    1,
                 )?;
                 let narrow_result = builder
                     .build_load(effective_address, &state.var_name())
@@ -2223,6 +2248,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i16_ptr_ty,
+                    2,
                 )?;
                 let narrow_result = builder
                     .build_load(effective_address, &state.var_name())
@@ -2241,6 +2267,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i8_ptr_ty,
+                    1,
                 )?;
                 let narrow_result = builder
                     .build_load(effective_address, &state.var_name())
@@ -2259,6 +2286,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i16_ptr_ty,
+                    2,
                 )?;
                 let narrow_result = builder
                     .build_load(effective_address, &state.var_name())
@@ -2277,6 +2305,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i32_ptr_ty,
+                    4,
                 )?;
                 let narrow_result = builder
                     .build_load(effective_address, &state.var_name())
@@ -2297,6 +2326,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i8_ptr_ty,
+                    1,
                 )?;
                 let narrow_value =
                     builder.build_int_truncate(value, intrinsics.i8_ty, &state.var_name());
@@ -2313,6 +2343,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i16_ptr_ty,
+                    2,
                 )?;
                 let narrow_value =
                     builder.build_int_truncate(value, intrinsics.i16_ty, &state.var_name());
@@ -2329,6 +2360,7 @@ impl FunctionCodeGenerator<CodegenError> for LLVMFunctionCodeGenerator {
                     &mut ctx,
                     memarg,
                     intrinsics.i32_ptr_ty,
+                    4,
                 )?;
                 let narrow_value =
                     builder.build_int_truncate(value, intrinsics.i32_ty, &state.var_name());
diff --git a/lib/llvm-backend/src/intrinsics.rs b/lib/llvm-backend/src/intrinsics.rs
index 6250fd4fd44..ebee5a3882d 100644
--- a/lib/llvm-backend/src/intrinsics.rs
+++ b/lib/llvm-backend/src/intrinsics.rs
@@ -16,6 +16,7 @@ use wasmer_runtime_core::{
         GlobalIndex, ImportedFuncIndex, LocalFuncIndex, LocalOrImport, MemoryIndex, SigIndex,
         TableIndex, Type,
     },
+    vm::Ctx,
 };
 
 fn type_to_llvm_ptr(intrinsics: &Intrinsics, ty: Type) -> PointerType {
@@ -158,6 +159,10 @@ impl Intrinsics {
         let imported_func_ty =
             context.struct_type(&[i8_ptr_ty_basic, ctx_ptr_ty.as_basic_type_enum()], false);
         let sigindex_ty = i32_ty;
+        let rt_intrinsics_ty = void_ty;
+        let stack_lower_bound_ty = i8_ty;
+        let memory_base_ty = i8_ty;
+        let memory_bound_ty = void_ty;
         let local_function_ty = i8_ptr_ty;
 
         let anyfunc_ty = context.struct_type(
@@ -201,6 +206,18 @@ impl Intrinsics {
                 sigindex_ty
                     .ptr_type(AddressSpace::Generic)
                     .as_basic_type_enum(),
+                rt_intrinsics_ty
+                    .ptr_type(AddressSpace::Generic)
+                    .as_basic_type_enum(),
+                stack_lower_bound_ty
+                    .ptr_type(AddressSpace::Generic)
+                    .as_basic_type_enum(),
+                memory_base_ty
+                    .ptr_type(AddressSpace::Generic)
+                    .as_basic_type_enum(),
+                memory_bound_ty
+                    .ptr_type(AddressSpace::Generic)
+                    .as_basic_type_enum(),
                 local_function_ty
                     .ptr_type(AddressSpace::Generic)
                     .as_basic_type_enum(),
@@ -416,6 +433,10 @@ pub struct CtxType<'a> {
     _phantom: PhantomData<&'a FunctionValue>,
 }
 
+fn offset_to_index(offset: u8) -> u32 {
+    (offset as usize / ::std::mem::size_of::<usize>()) as u32
+}
+
 impl<'a> CtxType<'a> {
     pub fn new(
         info: &'a ModuleInfo,
@@ -454,14 +475,22 @@ impl<'a> CtxType<'a> {
             let (memory_array_ptr_ptr, index, memory_type) = match index.local_or_import(info) {
                 LocalOrImport::Local(local_mem_index) => (
                     unsafe {
-                        cache_builder.build_struct_gep(ctx_ptr_value, 0, "memory_array_ptr_ptr")
+                        cache_builder.build_struct_gep(
+                            ctx_ptr_value,
+                            offset_to_index(Ctx::offset_memories()),
+                            "memory_array_ptr_ptr",
+                        )
                     },
                     local_mem_index.index() as u64,
                     info.memories[local_mem_index].memory_type(),
                 ),
                 LocalOrImport::Import(import_mem_index) => (
                     unsafe {
-                        cache_builder.build_struct_gep(ctx_ptr_value, 3, "memory_array_ptr_ptr")
+                        cache_builder.build_struct_gep(
+                            ctx_ptr_value,
+                            offset_to_index(Ctx::offset_imported_memories()),
+                            "memory_array_ptr_ptr",
+                        )
                     },
                     import_mem_index.index() as u64,
                     info.imported_memories[import_mem_index].1.memory_type(),
@@ -527,13 +556,21 @@ impl<'a> CtxType<'a> {
             let (table_array_ptr_ptr, index) = match index.local_or_import(info) {
                 LocalOrImport::Local(local_table_index) => (
                     unsafe {
-                        cache_builder.build_struct_gep(ctx_ptr_value, 1, "table_array_ptr_ptr")
+                        cache_builder.build_struct_gep(
+                            ctx_ptr_value,
+                            offset_to_index(Ctx::offset_tables()),
+                            "table_array_ptr_ptr",
+                        )
                     },
                     local_table_index.index() as u64,
                 ),
                 LocalOrImport::Import(import_table_index) => (
                     unsafe {
-                        cache_builder.build_struct_gep(ctx_ptr_value, 4, "table_array_ptr_ptr")
+                        cache_builder.build_struct_gep(
+                            ctx_ptr_value,
+                            offset_to_index(Ctx::offset_imported_tables()),
+                            "table_array_ptr_ptr",
+                        )
                     },
                     import_table_index.index() as u64,
                 ),
@@ -578,8 +615,13 @@ impl<'a> CtxType<'a> {
         intrinsics: &Intrinsics,
         builder: &Builder,
     ) -> PointerValue {
-        let local_func_array_ptr_ptr =
-            unsafe { builder.build_struct_gep(self.ctx_ptr_value, 8, "local_func_array_ptr_ptr") };
+        let local_func_array_ptr_ptr = unsafe {
+            builder.build_struct_gep(
+                self.ctx_ptr_value,
+                offset_to_index(Ctx::offset_local_functions()),
+                "local_func_array_ptr_ptr",
+            )
+        };
         let local_func_array_ptr = builder
             .build_load(local_func_array_ptr_ptr, "local_func_array_ptr")
             .into_pointer_value();
@@ -609,7 +651,11 @@ impl<'a> CtxType<'a> {
 
         *cached_sigindices.entry(index).or_insert_with(|| {
             let sigindex_array_ptr_ptr = unsafe {
-                cache_builder.build_struct_gep(ctx_ptr_value, 7, "sigindex_array_ptr_ptr")
+                cache_builder.build_struct_gep(
+                    ctx_ptr_value,
+                    offset_to_index(Ctx::offset_signatures()),
+                    "sigindex_array_ptr_ptr",
+                )
             };
             let sigindex_array_ptr = cache_builder
                 .build_load(sigindex_array_ptr_ptr, "sigindex_array_ptr")
@@ -647,7 +693,7 @@ impl<'a> CtxType<'a> {
                             unsafe {
                                 cache_builder.build_struct_gep(
                                     ctx_ptr_value,
-                                    2,
+                                    offset_to_index(Ctx::offset_globals()),
                                     "globals_array_ptr_ptr",
                                 )
                             },
@@ -662,7 +708,7 @@ impl<'a> CtxType<'a> {
                             unsafe {
                                 cache_builder.build_struct_gep(
                                     ctx_ptr_value,
-                                    5,
+                                    offset_to_index(Ctx::offset_imported_globals()),
                                     "globals_array_ptr_ptr",
                                 )
                             },
@@ -718,7 +764,11 @@ impl<'a> CtxType<'a> {
 
         let imported_func_cache = cached_imported_functions.entry(index).or_insert_with(|| {
             let func_array_ptr_ptr = unsafe {
-                cache_builder.build_struct_gep(ctx_ptr_value, 6, "imported_func_array_ptr_ptr")
+                cache_builder.build_struct_gep(
+                    ctx_ptr_value,
+                    offset_to_index(Ctx::offset_imported_funcs()),
+                    "imported_func_array_ptr_ptr",
+                )
             };
             let func_array_ptr = cache_builder
                 .build_load(func_array_ptr_ptr, "func_array_ptr")
diff --git a/lib/runtime-core/src/backend.rs b/lib/runtime-core/src/backend.rs
index d465cda5834..1d493c31475 100644
--- a/lib/runtime-core/src/backend.rs
+++ b/lib/runtime-core/src/backend.rs
@@ -39,16 +39,26 @@ impl Token {
     }
 }
 
+#[derive(Copy, Clone, Debug)]
+pub enum MemoryBoundCheckMode {
+    Default,
+    Enable,
+    Disable,
+}
+
+impl Default for MemoryBoundCheckMode {
+    fn default() -> MemoryBoundCheckMode {
+        MemoryBoundCheckMode::Default
+    }
+}
+
 /// Configuration data for the compiler
+#[derive(Default)]
 pub struct CompilerConfig {
     /// Symbol information generated from emscripten; used for more detailed debug messages
     pub symbol_map: Option<HashMap<u32, String>>,
-}
-
-impl Default for CompilerConfig {
-    fn default() -> CompilerConfig {
-        CompilerConfig { symbol_map: None }
-    }
+    pub memory_bound_check_mode: MemoryBoundCheckMode,
+    pub enforce_stack_check: bool,
 }
 
 pub trait Compiler {
@@ -80,6 +90,16 @@ pub trait RunnableModule: Send + Sync {
     fn get_trampoline(&self, info: &ModuleInfo, sig_index: SigIndex) -> Option<Wasm>;
 
     unsafe fn do_early_trap(&self, data: Box<dyn Any>) -> !;
+
+    /// Returns the machine code associated with this module.
+    fn get_code(&self) -> Option<&[u8]> {
+        None
+    }
+
+    /// Returns the beginning offsets of all functions, including import trampolines.
+    fn get_offsets(&self) -> Option<Vec<usize>> {
+        None
+    }
 }
 
 pub trait CacheGen: Send + Sync {
diff --git a/lib/runtime-core/src/backing.rs b/lib/runtime-core/src/backing.rs
index b3d529460ef..821ff379f4d 100644
--- a/lib/runtime-core/src/backing.rs
+++ b/lib/runtime-core/src/backing.rs
@@ -456,10 +456,17 @@ fn import_functions(
                 });
             }
             None => {
-                link_errors.push(LinkError::ImportNotFound {
-                    namespace: namespace.to_string(),
-                    name: name.to_string(),
-                });
+                if imports.allow_missing_functions {
+                    functions.push(vm::ImportedFunc {
+                        func: ::std::ptr::null(),
+                        vmctx: ::std::ptr::null_mut(),
+                    });
+                } else {
+                    link_errors.push(LinkError::ImportNotFound {
+                        namespace: namespace.to_string(),
+                        name: name.to_string(),
+                    });
+                }
             }
         }
     }
diff --git a/lib/runtime-core/src/codegen.rs b/lib/runtime-core/src/codegen.rs
index b61ce58bb88..1d9f30f1a4e 100644
--- a/lib/runtime-core/src/codegen.rs
+++ b/lib/runtime-core/src/codegen.rs
@@ -42,21 +42,29 @@ impl fmt::Debug for InternalEvent {
 pub struct BkptInfo {}
 
 pub trait ModuleCodeGenerator<FCG: FunctionCodeGenerator<E>, RM: RunnableModule, E: Debug> {
+    /// Creates a new module code generator.
     fn new() -> Self;
+
+    /// Returns the backend id associated with this MCG.
     fn backend_id() -> Backend;
-    fn check_precondition(&mut self, module_info: &ModuleInfo) -> Result<(), E>;
 
-    /// Creates a new function and returns the function-scope code generator for it.
-    fn next_function(&mut self) -> Result<&mut FCG, E>;
-    fn finalize(self, module_info: &ModuleInfo) -> Result<(RM, Box<dyn CacheGen>), E>;
+    /// Feeds the compiler config.
+    fn feed_compiler_config(&mut self, _config: &CompilerConfig) -> Result<(), E> {
+        Ok(())
+    }
+    /// Adds an import function.
+    fn feed_import_function(&mut self) -> Result<(), E>;
     fn feed_signatures(&mut self, signatures: Map<SigIndex, FuncSig>) -> Result<(), E>;
-
     /// Sets function signatures.
     fn feed_function_signatures(&mut self, assoc: Map<FuncIndex, SigIndex>) -> Result<(), E>;
+    /// Checks the precondition for a module.
+    fn check_precondition(&mut self, module_info: &ModuleInfo) -> Result<(), E>;
+    /// Creates a new function and returns the function-scope code generator for it.
+    fn next_function(&mut self) -> Result<&mut FCG, E>;
+    /// Finalizes this module.
+    fn finalize(self, module_info: &ModuleInfo) -> Result<(RM, Box<dyn CacheGen>), E>;
 
-    /// Adds an import function.
-    fn feed_import_function(&mut self) -> Result<(), E>;
-
+    /// Creates a module from cache.
     unsafe fn from_cache(cache: Artifact, _: Token) -> Result<ModuleInner, CacheError>;
 }
 
diff --git a/lib/runtime-core/src/import.rs b/lib/runtime-core/src/import.rs
index 14465deedd3..9522b0829fa 100644
--- a/lib/runtime-core/src/import.rs
+++ b/lib/runtime-core/src/import.rs
@@ -47,6 +47,7 @@ impl IsExport for Export {
 pub struct ImportObject {
     map: Rc<RefCell<HashMap<String, Box<dyn LikeNamespace>>>>,
     state_creator: Option<Rc<Fn() -> (*mut c_void, fn(*mut c_void))>>,
+    pub allow_missing_functions: bool,
 }
 
 impl ImportObject {
@@ -55,6 +56,7 @@ impl ImportObject {
         Self {
             map: Rc::new(RefCell::new(HashMap::new())),
             state_creator: None,
+            allow_missing_functions: false,
         }
     }
 
@@ -65,6 +67,7 @@ impl ImportObject {
         Self {
             map: Rc::new(RefCell::new(HashMap::new())),
             state_creator: Some(Rc::new(state_creator)),
+            allow_missing_functions: false,
         }
     }
 
@@ -116,6 +119,7 @@ impl ImportObject {
         Self {
             map: Rc::clone(&self.map),
             state_creator: self.state_creator.clone(),
+            allow_missing_functions: false,
         }
     }
 
diff --git a/lib/runtime-core/src/instance.rs b/lib/runtime-core/src/instance.rs
index d5f84acc2b3..69a8884c3af 100644
--- a/lib/runtime-core/src/instance.rs
+++ b/lib/runtime-core/src/instance.rs
@@ -5,9 +5,11 @@ use crate::{
     export::{Context, Export, ExportIter, FuncPointer},
     global::Global,
     import::{ImportObject, LikeNamespace},
+    loader::Loader,
     memory::Memory,
     module::{ExportIndex, Module, ModuleInfo, ModuleInner},
     sig_registry::SigRegistry,
+    structures::TypedIndex,
     table::Table,
     typed_func::{Func, Wasm, WasmTrapInfo, WasmTypeList},
     types::{FuncIndex, FuncSig, GlobalIndex, LocalOrImport, MemoryIndex, TableIndex, Type, Value},
@@ -38,7 +40,7 @@ impl Drop for InstanceInner {
 ///
 /// [`ImportObject`]: struct.ImportObject.html
 pub struct Instance {
-    module: Arc<ModuleInner>,
+    pub module: Arc<ModuleInner>,
     inner: Box<InstanceInner>,
     #[allow(dead_code)]
     import_object: ImportObject,
@@ -127,6 +129,12 @@ impl Instance {
         Ok(instance)
     }
 
+    pub fn load<T: Loader>(&self, loader: T) -> ::std::result::Result<T::Instance, T::Error> {
+        loader.load(&*self.module.runnable_module, &self.module.info, unsafe {
+            &*self.inner.vmctx
+        })
+    }
+
     /// Through generic magic and the awe-inspiring power of traits, we bring you...
     ///
     /// # "Func"
@@ -214,6 +222,26 @@ impl Instance {
         }
     }
 
+    pub fn resolve_func(&self, name: &str) -> ResolveResult<usize> {
+        let export_index =
+            self.module
+                .info
+                .exports
+                .get(name)
+                .ok_or_else(|| ResolveError::ExportNotFound {
+                    name: name.to_string(),
+                })?;
+
+        if let ExportIndex::Func(func_index) = export_index {
+            Ok(func_index.index())
+        } else {
+            Err(ResolveError::ExportWrongType {
+                name: name.to_string(),
+            }
+            .into())
+        }
+    }
+
     /// This returns the representation of a function that can be called
     /// safely.
     ///
diff --git a/lib/runtime-core/src/lib.rs b/lib/runtime-core/src/lib.rs
index da9144a2b10..20708c17a5e 100644
--- a/lib/runtime-core/src/lib.rs
+++ b/lib/runtime-core/src/lib.rs
@@ -21,6 +21,7 @@ pub mod export;
 pub mod global;
 pub mod import;
 pub mod instance;
+pub mod loader;
 pub mod memory;
 pub mod module;
 pub mod parse;
diff --git a/lib/runtime-core/src/loader.rs b/lib/runtime-core/src/loader.rs
new file mode 100644
index 00000000000..5ef127ec728
--- /dev/null
+++ b/lib/runtime-core/src/loader.rs
@@ -0,0 +1,169 @@
+use crate::{backend::RunnableModule, module::ModuleInfo, types::Value, vm::Ctx};
+#[cfg(unix)]
+use libc::{mmap, mprotect, munmap, MAP_ANON, MAP_PRIVATE, PROT_EXEC, PROT_READ, PROT_WRITE};
+use std::{
+    fmt::Debug,
+    ops::{Deref, DerefMut},
+};
+
+pub trait Loader {
+    type Instance: Instance;
+    type Error: Debug;
+
+    fn load(
+        &self,
+        rm: &dyn RunnableModule,
+        module: &ModuleInfo,
+        ctx: &Ctx,
+    ) -> Result<Self::Instance, Self::Error>;
+}
+
+pub trait Instance {
+    type Error: Debug;
+    fn call(&mut self, id: usize, args: &[Value]) -> Result<u64, Self::Error>;
+    fn read_memory(&mut self, _offset: u32, _len: u32) -> Result<Vec<u8>, Self::Error> {
+        unimplemented!()
+    }
+
+    fn write_memory(&mut self, _offset: u32, _len: u32, _buf: &[u8]) -> Result<(), Self::Error> {
+        unimplemented!()
+    }
+}
+
+pub struct LocalLoader;
+
+impl Loader for LocalLoader {
+    type Instance = LocalInstance;
+    type Error = String;
+
+    fn load(
+        &self,
+        rm: &dyn RunnableModule,
+        _module: &ModuleInfo,
+        _ctx: &Ctx,
+    ) -> Result<Self::Instance, Self::Error> {
+        let code = rm.get_code().unwrap();
+        let mut code_mem = CodeMemory::new(code.len());
+        code_mem[..code.len()].copy_from_slice(code);
+        code_mem.make_executable();
+
+        Ok(LocalInstance {
+            code: code_mem,
+            offsets: rm.get_offsets().unwrap(),
+        })
+    }
+}
+
+pub struct LocalInstance {
+    code: CodeMemory,
+    offsets: Vec<usize>,
+}
+
+impl Instance for LocalInstance {
+    type Error = String;
+    fn call(&mut self, id: usize, args: &[Value]) -> Result<u64, Self::Error> {
+        let offset = self.offsets[id];
+        let addr: *const u8 = unsafe { self.code.as_ptr().offset(offset as isize) };
+        use std::mem::transmute;
+        Ok(unsafe {
+            match args.len() {
+                0 => (transmute::<_, extern "C" fn() -> u64>(addr))(),
+                1 => (transmute::<_, extern "C" fn(u64) -> u64>(addr))(args[0].to_u64()),
+                2 => (transmute::<_, extern "C" fn(u64, u64) -> u64>(addr))(
+                    args[0].to_u64(),
+                    args[1].to_u64(),
+                ),
+                3 => (transmute::<_, extern "C" fn(u64, u64, u64) -> u64>(addr))(
+                    args[0].to_u64(),
+                    args[1].to_u64(),
+                    args[2].to_u64(),
+                ),
+                4 => (transmute::<_, extern "C" fn(u64, u64, u64, u64) -> u64>(addr))(
+                    args[0].to_u64(),
+                    args[1].to_u64(),
+                    args[2].to_u64(),
+                    args[3].to_u64(),
+                ),
+                5 => (transmute::<_, extern "C" fn(u64, u64, u64, u64, u64) -> u64>(addr))(
+                    args[0].to_u64(),
+                    args[1].to_u64(),
+                    args[2].to_u64(),
+                    args[3].to_u64(),
+                    args[4].to_u64(),
+                ),
+                _ => return Err("too many arguments".into()),
+            }
+        })
+    }
+}
+
+pub struct CodeMemory {
+    ptr: *mut u8,
+    size: usize,
+}
+
+#[cfg(not(unix))]
+impl CodeMemory {
+    pub fn new(_size: usize) -> CodeMemory {
+        unimplemented!();
+    }
+
+    pub fn make_executable(&mut self) {
+        unimplemented!();
+    }
+}
+
+#[cfg(unix)]
+impl CodeMemory {
+    pub fn new(size: usize) -> CodeMemory {
+        fn round_up_to_page_size(size: usize) -> usize {
+            (size + (4096 - 1)) & !(4096 - 1)
+        }
+        let size = round_up_to_page_size(size);
+        let ptr = unsafe {
+            mmap(
+                ::std::ptr::null_mut(),
+                size,
+                PROT_READ | PROT_WRITE,
+                MAP_PRIVATE | MAP_ANON,
+                -1,
+                0,
+            )
+        };
+        if ptr as isize == -1 {
+            panic!("cannot allocate code memory");
+        }
+        CodeMemory {
+            ptr: ptr as _,
+            size: size,
+        }
+    }
+
+    pub fn make_executable(&mut self) {
+        if unsafe { mprotect(self.ptr as _, self.size, PROT_READ | PROT_EXEC) } != 0 {
+            panic!("cannot set code memory to executable");
+        }
+    }
+}
+
+#[cfg(unix)]
+impl Drop for CodeMemory {
+    fn drop(&mut self) {
+        unsafe {
+            munmap(self.ptr as _, self.size);
+        }
+    }
+}
+
+impl Deref for CodeMemory {
+    type Target = [u8];
+    fn deref(&self) -> &[u8] {
+        unsafe { ::std::slice::from_raw_parts(self.ptr, self.size) }
+    }
+}
+
+impl DerefMut for CodeMemory {
+    fn deref_mut(&mut self) -> &mut [u8] {
+        unsafe { ::std::slice::from_raw_parts_mut(self.ptr, self.size) }
+    }
+}
diff --git a/lib/runtime-core/src/parse.rs b/lib/runtime-core/src/parse.rs
index e7e80fc2971..7fdbd095ac9 100644
--- a/lib/runtime-core/src/parse.rs
+++ b/lib/runtime-core/src/parse.rs
@@ -53,6 +53,8 @@ pub fn read_module<
     middlewares: &mut MiddlewareChain,
     compiler_config: &CompilerConfig,
 ) -> Result<ModuleInfo, LoadError> {
+    mcg.feed_compiler_config(compiler_config)
+        .map_err(|x| LoadError::Codegen(format!("{:?}", x)))?;
     let mut info = ModuleInfo {
         memories: Map::new(),
         globals: Map::new(),
diff --git a/lib/runtime-core/src/types.rs b/lib/runtime-core/src/types.rs
index 975b5cfba36..0c8f08d1a8c 100644
--- a/lib/runtime-core/src/types.rs
+++ b/lib/runtime-core/src/types.rs
@@ -45,6 +45,15 @@ impl Value {
             Value::F64(_) => Type::F64,
         }
     }
+
+    pub fn to_u64(&self) -> u64 {
+        match *self {
+            Value::I32(x) => x as u32 as u64,
+            Value::I64(x) => x as u64,
+            Value::F32(x) => f32::to_bits(x) as u64,
+            Value::F64(x) => f64::to_bits(x),
+        }
+    }
 }
 
 impl From<i32> for Value {
diff --git a/lib/runtime-core/src/vm.rs b/lib/runtime-core/src/vm.rs
index 6649b6a5919..323e40c219b 100644
--- a/lib/runtime-core/src/vm.rs
+++ b/lib/runtime-core/src/vm.rs
@@ -1,9 +1,10 @@
 pub use crate::backing::{ImportBacking, LocalBacking};
 use crate::{
-    memory::Memory,
-    module::ModuleInner,
+    memory::{Memory, MemoryType},
+    module::{ModuleInfo, ModuleInner},
     structures::TypedIndex,
     types::{LocalOrImport, MemoryIndex},
+    vmcalls,
 };
 use std::{ffi::c_void, mem, ptr};
 
@@ -25,7 +26,7 @@ use hashbrown::HashMap;
 #[repr(C)]
 pub struct Ctx {
     // `internal` must be the first field of `Ctx`.
-    pub(crate) internal: InternalCtx,
+    pub internal: InternalCtx,
 
     pub(crate) local_functions: *const *const Func,
 
@@ -84,6 +85,83 @@ pub struct InternalCtx {
     /// signature id. This is used to allow call-indirect to other
     /// modules safely.
     pub dynamic_sigindices: *const SigId,
+
+    pub intrinsics: *const Intrinsics,
+
+    pub stack_lower_bound: *mut u8,
+
+    pub memory_base: *mut u8,
+    pub memory_bound: usize,
+}
+
+#[repr(C)]
+pub struct Intrinsics {
+    pub memory_grow: *const Func,
+    pub memory_size: *const Func,
+    /*pub memory_grow: unsafe extern "C" fn(
+        ctx: &mut Ctx,
+        memory_index: usize,
+        delta: Pages,
+    ) -> i32,
+    pub memory_size: unsafe extern "C" fn(
+        ctx: &Ctx,
+        memory_index: usize,
+    ) -> Pages,*/
+}
+
+unsafe impl Send for Intrinsics {}
+unsafe impl Sync for Intrinsics {}
+
+impl Intrinsics {
+    #[allow(clippy::erasing_op)]
+    pub fn offset_memory_grow() -> u8 {
+        (0 * ::std::mem::size_of::<usize>()) as u8
+    }
+    pub fn offset_memory_size() -> u8 {
+        (1 * ::std::mem::size_of::<usize>()) as u8
+    }
+}
+
+pub static INTRINSICS_LOCAL_STATIC_MEMORY: Intrinsics = Intrinsics {
+    memory_grow: vmcalls::local_static_memory_grow as _,
+    memory_size: vmcalls::local_static_memory_size as _,
+};
+pub static INTRINSICS_LOCAL_DYNAMIC_MEMORY: Intrinsics = Intrinsics {
+    memory_grow: vmcalls::local_dynamic_memory_grow as _,
+    memory_size: vmcalls::local_dynamic_memory_size as _,
+};
+pub static INTRINSICS_IMPORTED_STATIC_MEMORY: Intrinsics = Intrinsics {
+    memory_grow: vmcalls::imported_static_memory_grow as _,
+    memory_size: vmcalls::imported_static_memory_size as _,
+};
+pub static INTRINSICS_IMPORTED_DYNAMIC_MEMORY: Intrinsics = Intrinsics {
+    memory_grow: vmcalls::imported_dynamic_memory_grow as _,
+    memory_size: vmcalls::imported_dynamic_memory_size as _,
+};
+
+fn get_intrinsics_for_module(m: &ModuleInfo) -> *const Intrinsics {
+    if m.memories.len() == 0 && m.imported_memories.len() == 0 {
+        ::std::ptr::null()
+    } else {
+        match MemoryIndex::new(0).local_or_import(m) {
+            LocalOrImport::Local(local_mem_index) => {
+                let mem_desc = &m.memories[local_mem_index];
+                match mem_desc.memory_type() {
+                    MemoryType::Dynamic => &INTRINSICS_LOCAL_DYNAMIC_MEMORY,
+                    MemoryType::Static => &INTRINSICS_LOCAL_STATIC_MEMORY,
+                    MemoryType::SharedStatic => unimplemented!(),
+                }
+            }
+            LocalOrImport::Import(import_mem_index) => {
+                let mem_desc = &m.imported_memories[import_mem_index].1;
+                match mem_desc.memory_type() {
+                    MemoryType::Dynamic => &INTRINSICS_IMPORTED_DYNAMIC_MEMORY,
+                    MemoryType::Static => &INTRINSICS_IMPORTED_STATIC_MEMORY,
+                    MemoryType::SharedStatic => unimplemented!(),
+                }
+            }
+        }
+    }
 }
 
 impl Ctx {
@@ -93,6 +171,16 @@ impl Ctx {
         import_backing: &mut ImportBacking,
         module: &ModuleInner,
     ) -> Self {
+        let (mem_base, mem_bound): (*mut u8, usize) =
+            if module.info.memories.len() == 0 && module.info.imported_memories.len() == 0 {
+                (::std::ptr::null_mut(), 0)
+            } else {
+                let mem = match MemoryIndex::new(0).local_or_import(&module.info) {
+                    LocalOrImport::Local(index) => local_backing.vm_memories[index],
+                    LocalOrImport::Import(index) => import_backing.vm_memories[index],
+                };
+                ((*mem).base, (*mem).bound)
+            };
         Self {
             internal: InternalCtx {
                 memories: local_backing.vm_memories.as_mut_ptr(),
@@ -105,6 +193,13 @@ impl Ctx {
                 imported_funcs: import_backing.vm_functions.as_mut_ptr(),
 
                 dynamic_sigindices: local_backing.dynamic_sigindices.as_ptr(),
+
+                intrinsics: get_intrinsics_for_module(&module.info),
+
+                stack_lower_bound: ::std::ptr::null_mut(),
+
+                memory_base: mem_base,
+                memory_bound: mem_bound,
             },
             local_functions: local_backing.local_functions.as_ptr(),
 
@@ -125,6 +220,16 @@ impl Ctx {
         data: *mut c_void,
         data_finalizer: fn(*mut c_void),
     ) -> Self {
+        let (mem_base, mem_bound): (*mut u8, usize) =
+            if module.info.memories.len() == 0 && module.info.imported_memories.len() == 0 {
+                (::std::ptr::null_mut(), 0)
+            } else {
+                let mem = match MemoryIndex::new(0).local_or_import(&module.info) {
+                    LocalOrImport::Local(index) => local_backing.vm_memories[index],
+                    LocalOrImport::Import(index) => import_backing.vm_memories[index],
+                };
+                ((*mem).base, (*mem).bound)
+            };
         Self {
             internal: InternalCtx {
                 memories: local_backing.vm_memories.as_mut_ptr(),
@@ -137,6 +242,13 @@ impl Ctx {
                 imported_funcs: import_backing.vm_functions.as_mut_ptr(),
 
                 dynamic_sigindices: local_backing.dynamic_sigindices.as_ptr(),
+
+                intrinsics: get_intrinsics_for_module(&module.info),
+
+                stack_lower_bound: ::std::ptr::null_mut(),
+
+                memory_base: mem_base,
+                memory_bound: mem_bound,
             },
             local_functions: local_backing.local_functions.as_ptr(),
 
@@ -186,6 +298,11 @@ impl Ctx {
     pub unsafe fn borrow_symbol_map(&self) -> &Option<HashMap<u32, String>> {
         &(*self.module).info.em_symbol_map
     }
+
+    /// Returns the number of dynamic sigindices.
+    pub fn dynamic_sigindice_count(&self) -> usize {
+        unsafe { (*self.local_backing).dynamic_sigindices.len() }
+    }
 }
 
 #[doc(hidden)]
@@ -223,9 +340,25 @@ impl Ctx {
         7 * (mem::size_of::<usize>() as u8)
     }
 
-    pub fn offset_local_functions() -> u8 {
+    pub fn offset_intrinsics() -> u8 {
         8 * (mem::size_of::<usize>() as u8)
     }
+
+    pub fn offset_stack_lower_bound() -> u8 {
+        9 * (mem::size_of::<usize>() as u8)
+    }
+
+    pub fn offset_memory_base() -> u8 {
+        10 * (mem::size_of::<usize>() as u8)
+    }
+
+    pub fn offset_memory_bound() -> u8 {
+        11 * (mem::size_of::<usize>() as u8)
+    }
+
+    pub fn offset_local_functions() -> u8 {
+        12 * (mem::size_of::<usize>() as u8)
+    }
 }
 
 enum InnerFunc {}
@@ -419,6 +552,26 @@ mod vm_offset_tests {
             offset_of!(InternalCtx => imported_funcs).get_byte_offset(),
         );
 
+        assert_eq!(
+            Ctx::offset_intrinsics() as usize,
+            offset_of!(InternalCtx => intrinsics).get_byte_offset(),
+        );
+
+        assert_eq!(
+            Ctx::offset_stack_lower_bound() as usize,
+            offset_of!(InternalCtx => stack_lower_bound).get_byte_offset(),
+        );
+
+        assert_eq!(
+            Ctx::offset_memory_base() as usize,
+            offset_of!(InternalCtx => memory_base).get_byte_offset(),
+        );
+
+        assert_eq!(
+            Ctx::offset_memory_bound() as usize,
+            offset_of!(InternalCtx => memory_bound).get_byte_offset(),
+        );
+
         assert_eq!(
             Ctx::offset_local_functions() as usize,
             offset_of!(Ctx => local_functions).get_byte_offset(),
diff --git a/lib/runtime-core/src/vmcalls.rs b/lib/runtime-core/src/vmcalls.rs
index 4126024bf83..5205a0d6901 100644
--- a/lib/runtime-core/src/vmcalls.rs
+++ b/lib/runtime-core/src/vmcalls.rs
@@ -20,10 +20,15 @@ pub unsafe extern "C" fn local_static_memory_grow(
     let local_memory = *ctx.internal.memories.add(memory_index.index());
     let memory = (*local_memory).memory as *mut StaticMemory;
 
-    match (*memory).grow(delta, &mut *local_memory) {
+    let ret = match (*memory).grow(delta, &mut *local_memory) {
         Ok(old) => old.0 as i32,
         Err(_) => -1,
-    }
+    };
+
+    ctx.internal.memory_base = (*local_memory).base;
+    ctx.internal.memory_bound = (*local_memory).bound;
+
+    ret
 }
 
 pub unsafe extern "C" fn local_static_memory_size(
@@ -44,10 +49,15 @@ pub unsafe extern "C" fn local_dynamic_memory_grow(
     let local_memory = *ctx.internal.memories.add(memory_index.index());
     let memory = (*local_memory).memory as *mut DynamicMemory;
 
-    match (*memory).grow(delta, &mut *local_memory) {
+    let ret = match (*memory).grow(delta, &mut *local_memory) {
         Ok(old) => old.0 as i32,
         Err(_) => -1,
-    }
+    };
+
+    ctx.internal.memory_base = (*local_memory).base;
+    ctx.internal.memory_bound = (*local_memory).bound;
+
+    ret
 }
 
 pub unsafe extern "C" fn local_dynamic_memory_size(
@@ -75,10 +85,15 @@ pub unsafe extern "C" fn imported_static_memory_grow(
         .add(import_memory_index.index());
     let memory = (*local_memory).memory as *mut StaticMemory;
 
-    match (*memory).grow(delta, &mut *local_memory) {
+    let ret = match (*memory).grow(delta, &mut *local_memory) {
         Ok(old) => old.0 as i32,
         Err(_) => -1,
-    }
+    };
+
+    ctx.internal.memory_base = (*local_memory).base;
+    ctx.internal.memory_bound = (*local_memory).bound;
+
+    ret
 }
 
 pub unsafe extern "C" fn imported_static_memory_size(
@@ -102,10 +117,15 @@ pub unsafe extern "C" fn imported_dynamic_memory_grow(
     let local_memory = *ctx.internal.imported_memories.add(memory_index.index());
     let memory = (*local_memory).memory as *mut DynamicMemory;
 
-    match (*memory).grow(delta, &mut *local_memory) {
+    let ret = match (*memory).grow(delta, &mut *local_memory) {
         Ok(old) => old.0 as i32,
         Err(_) => -1,
-    }
+    };
+
+    ctx.internal.memory_base = (*local_memory).base;
+    ctx.internal.memory_bound = (*local_memory).bound;
+
+    ret
 }
 
 pub unsafe extern "C" fn imported_dynamic_memory_size(
diff --git a/lib/singlepass-backend/Cargo.toml b/lib/singlepass-backend/Cargo.toml
index 72ec5200a8e..201a4d879c9 100644
--- a/lib/singlepass-backend/Cargo.toml
+++ b/lib/singlepass-backend/Cargo.toml
@@ -10,7 +10,7 @@ edition = "2018"
 [dependencies]
 wasmer-runtime-core = { path = "../runtime-core", version = "0.4.1" }
 wasmparser = "0.29.2"
-dynasm = "0.3.1"
+dynasm = "0.3.2"
 dynasmrt = "0.3.1"
 lazy_static = "1.2.0"
 byteorder = "1"
diff --git a/lib/singlepass-backend/src/codegen_x64.rs b/lib/singlepass-backend/src/codegen_x64.rs
index 9aa6c9151e2..7d4d0de5cc1 100644
--- a/lib/singlepass-backend/src/codegen_x64.rs
+++ b/lib/singlepass-backend/src/codegen_x64.rs
@@ -10,7 +10,9 @@ use smallvec::SmallVec;
 use std::ptr::NonNull;
 use std::{any::Any, collections::HashMap, sync::Arc};
 use wasmer_runtime_core::{
-    backend::{sys::Memory, Backend, CacheGen, RunnableModule, Token},
+    backend::{
+        sys::Memory, Backend, CacheGen, CompilerConfig, MemoryBoundCheckMode, RunnableModule, Token,
+    },
     cache::{Artifact, Error as CacheError},
     codegen::*,
     memory::MemoryType,
@@ -21,8 +23,7 @@ use wasmer_runtime_core::{
         FuncIndex, FuncSig, GlobalIndex, LocalFuncIndex, LocalOrImport, MemoryIndex, SigIndex,
         TableIndex, Type,
     },
-    vm::{self, LocalGlobal, LocalMemory, LocalTable},
-    vmcalls,
+    vm::{self, LocalGlobal, LocalTable},
 };
 use wasmparser::{Operator, Type as WpType};
 
@@ -121,6 +122,8 @@ pub struct X64ModuleCodeGenerator {
     function_labels: Option<HashMap<usize, (DynamicLabel, Option<AssemblyOffset>)>>,
     assembler: Option<Assembler>,
     func_import_count: usize,
+
+    config: Option<Arc<CodegenConfig>>,
 }
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
@@ -135,7 +138,6 @@ pub struct X64FunctionCode {
 
     assembler: Option<Assembler>,
     function_labels: Option<HashMap<usize, (DynamicLabel, Option<AssemblyOffset>)>>,
-    br_table_data: Option<Vec<Vec<usize>>>,
     breakpoints: Option<HashMap<AssemblyOffset, Box<Fn(BkptInfo) + Send + Sync + 'static>>>,
     returns: SmallVec<[WpType; 1]>,
     locals: Vec<Location>,
@@ -145,6 +147,8 @@ pub struct X64FunctionCode {
     control_stack: Vec<ControlFrame>,
     machine: Machine,
     unreachable_depth: usize,
+
+    config: Arc<CodegenConfig>,
 }
 
 enum FuncPtrInner {}
@@ -160,8 +164,8 @@ pub struct X64ExecutionContext {
     #[allow(dead_code)]
     functions: Vec<X64FunctionCode>,
     function_pointers: Vec<FuncPtr>,
+    function_offsets: Vec<AssemblyOffset>,
     signatures: Arc<Map<SigIndex, FuncSig>>,
-    _br_table_data: Vec<Vec<usize>>,
     breakpoints: Arc<HashMap<usize, Box<Fn(BkptInfo) + Send + Sync + 'static>>>,
     func_import_count: usize,
 }
@@ -271,6 +275,14 @@ impl RunnableModule for X64ExecutionContext {
         protect_unix::TRAP_EARLY_DATA.with(|x| x.set(Some(data)));
         protect_unix::trigger_trap();
     }
+
+    fn get_code(&self) -> Option<&[u8]> {
+        Some(&self.code)
+    }
+
+    fn get_offsets(&self) -> Option<Vec<usize>> {
+        Some(self.function_offsets.iter().map(|x| x.0).collect())
+    }
 }
 
 #[derive(Debug)]
@@ -278,6 +290,12 @@ pub struct CodegenError {
     pub message: &'static str,
 }
 
+#[derive(Copy, Clone, Debug)]
+struct CodegenConfig {
+    memory_bound_check_mode: MemoryBoundCheckMode,
+    enforce_stack_check: bool,
+}
+
 impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
     for X64ModuleCodeGenerator
 {
@@ -289,6 +307,7 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
             function_labels: Some(HashMap::new()),
             assembler: Some(Assembler::new().unwrap()),
             func_import_count: 0,
+            config: None,
         }
     }
 
@@ -301,21 +320,18 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
     }
 
     fn next_function(&mut self) -> Result<&mut X64FunctionCode, CodegenError> {
-        let (mut assembler, mut function_labels, br_table_data, breakpoints) =
-            match self.functions.last_mut() {
-                Some(x) => (
-                    x.assembler.take().unwrap(),
-                    x.function_labels.take().unwrap(),
-                    x.br_table_data.take().unwrap(),
-                    x.breakpoints.take().unwrap(),
-                ),
-                None => (
-                    self.assembler.take().unwrap(),
-                    self.function_labels.take().unwrap(),
-                    vec![],
-                    HashMap::new(),
-                ),
-            };
+        let (mut assembler, mut function_labels, breakpoints) = match self.functions.last_mut() {
+            Some(x) => (
+                x.assembler.take().unwrap(),
+                x.function_labels.take().unwrap(),
+                x.breakpoints.take().unwrap(),
+            ),
+            None => (
+                self.assembler.take().unwrap(),
+                self.function_labels.take().unwrap(),
+                HashMap::new(),
+            ),
+        };
         let begin_offset = assembler.offset();
         let begin_label_info = function_labels
             .entry(self.functions.len() + self.func_import_count)
@@ -335,7 +351,6 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
 
             assembler: Some(assembler),
             function_labels: Some(function_labels),
-            br_table_data: Some(br_table_data),
             breakpoints: Some(breakpoints),
             returns: smallvec![],
             locals: vec![],
@@ -345,6 +360,7 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
             control_stack: vec![],
             machine: Machine::new(),
             unreachable_depth: 0,
+            config: self.config.as_ref().unwrap().clone(),
         };
         self.functions.push(code);
         Ok(self.functions.last_mut().unwrap())
@@ -354,12 +370,8 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
         mut self,
         _: &ModuleInfo,
     ) -> Result<(X64ExecutionContext, Box<dyn CacheGen>), CodegenError> {
-        let (assembler, mut br_table_data, breakpoints) = match self.functions.last_mut() {
-            Some(x) => (
-                x.assembler.take().unwrap(),
-                x.br_table_data.take().unwrap(),
-                x.breakpoints.take().unwrap(),
-            ),
+        let (assembler, breakpoints) = match self.functions.last_mut() {
+            Some(x) => (x.assembler.take().unwrap(), x.breakpoints.take().unwrap()),
             None => {
                 return Err(CodegenError {
                     message: "no function",
@@ -368,18 +380,13 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
         };
         let output = assembler.finalize().unwrap();
 
-        for table in &mut br_table_data {
-            for entry in table {
-                *entry = output.ptr(AssemblyOffset(*entry)) as usize;
-            }
-        }
-
         let function_labels = if let Some(x) = self.functions.last() {
             x.function_labels.as_ref().unwrap()
         } else {
             self.function_labels.as_ref().unwrap()
         };
         let mut out_labels: Vec<FuncPtr> = vec![];
+        let mut out_offsets: Vec<AssemblyOffset> = vec![];
 
         for i in 0..function_labels.len() {
             let (_, offset) = match function_labels.get(&i) {
@@ -399,6 +406,7 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
                 }
             };
             out_labels.push(FuncPtr(output.ptr(*offset) as _));
+            out_offsets.push(*offset);
         }
 
         let breakpoints: Arc<HashMap<_, _>> = Arc::new(
@@ -416,16 +424,15 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
                 ))
             }
         }
-
         Ok((
             X64ExecutionContext {
                 code: output,
                 functions: self.functions,
                 signatures: self.signatures.as_ref().unwrap().clone(),
-                _br_table_data: br_table_data,
                 breakpoints: breakpoints,
                 func_import_count: self.func_import_count,
                 function_pointers: out_labels,
+                function_offsets: out_offsets,
             },
             Box::new(Placeholder),
         ))
@@ -478,6 +485,13 @@ impl ModuleCodeGenerator<X64FunctionCode, X64ExecutionContext, CodegenError>
         Ok(())
     }
 
+    fn feed_compiler_config(&mut self, config: &CompilerConfig) -> Result<(), CodegenError> {
+        self.config = Some(Arc::new(CodegenConfig {
+            memory_bound_check_mode: config.memory_bound_check_mode,
+            enforce_stack_check: config.enforce_stack_check,
+        }));
+        Ok(())
+    }
     unsafe fn from_cache(_artifact: Artifact, _: Token) -> Result<ModuleInner, CacheError> {
         Err(CacheError::Unknown(
             "the singlepass compiler API doesn't support caching yet".to_string(),
@@ -1196,6 +1210,7 @@ impl X64FunctionCode {
     /// Emits a memory operation.
     fn emit_memory_op<F: FnOnce(&mut Assembler, &mut Machine, GPR)>(
         module_info: &ModuleInfo,
+        config: &CodegenConfig,
         a: &mut Assembler,
         m: &mut Machine,
         addr: Location,
@@ -1203,54 +1218,47 @@ impl X64FunctionCode {
         value_size: usize,
         cb: F,
     ) {
+        // If the memory is dynamic, we need to do bound checking at runtime.
+        let mem_desc = match MemoryIndex::new(0).local_or_import(module_info) {
+            LocalOrImport::Local(local_mem_index) => &module_info.memories[local_mem_index],
+            LocalOrImport::Import(import_mem_index) => {
+                &module_info.imported_memories[import_mem_index].1
+            }
+        };
+        let need_check = match config.memory_bound_check_mode {
+            MemoryBoundCheckMode::Default => match mem_desc.memory_type() {
+                MemoryType::Dynamic => true,
+                MemoryType::Static | MemoryType::SharedStatic => false,
+            },
+            MemoryBoundCheckMode::Enable => true,
+            MemoryBoundCheckMode::Disable => false,
+        };
+
         let tmp_addr = m.acquire_temp_gpr().unwrap();
         let tmp_base = m.acquire_temp_gpr().unwrap();
         let tmp_bound = m.acquire_temp_gpr().unwrap();
 
-        // Loads both base and bound into temporary registers.
+        // Load base into temporary register.
         a.emit_mov(
             Size::S64,
             Location::Memory(
                 Machine::get_vmctx_reg(),
-                match MemoryIndex::new(0).local_or_import(module_info) {
-                    LocalOrImport::Local(_) => vm::Ctx::offset_memories(),
-                    LocalOrImport::Import(_) => vm::Ctx::offset_imported_memories(),
-                } as i32,
+                vm::Ctx::offset_memory_base() as i32,
             ),
             Location::GPR(tmp_base),
         );
-        a.emit_mov(
-            Size::S64,
-            Location::Memory(tmp_base, 0),
-            Location::GPR(tmp_base),
-        );
-        a.emit_mov(
-            Size::S32,
-            Location::Memory(tmp_base, LocalMemory::offset_bound() as i32),
-            Location::GPR(tmp_bound),
-        );
-        a.emit_mov(
-            Size::S64,
-            Location::Memory(tmp_base, LocalMemory::offset_base() as i32),
-            Location::GPR(tmp_base),
-        );
-
-        // Adds base to bound so `tmp_bound` now holds the end of linear memory.
-        a.emit_add(Size::S64, Location::GPR(tmp_base), Location::GPR(tmp_bound));
-
-        // If the memory is dynamic, we need to do bound checking at runtime.
-        let mem_desc = match MemoryIndex::new(0).local_or_import(module_info) {
-            LocalOrImport::Local(local_mem_index) => &module_info.memories[local_mem_index],
-            LocalOrImport::Import(import_mem_index) => {
-                &module_info.imported_memories[import_mem_index].1
-            }
-        };
-        let need_check = match mem_desc.memory_type() {
-            MemoryType::Dynamic => true,
-            MemoryType::Static | MemoryType::SharedStatic => false,
-        };
 
         if need_check {
+            a.emit_mov(
+                Size::S64,
+                Location::Memory(
+                    Machine::get_vmctx_reg(),
+                    vm::Ctx::offset_memory_bound() as i32,
+                ),
+                Location::GPR(tmp_bound),
+            );
+            // Adds base to bound so `tmp_bound` now holds the end of linear memory.
+            a.emit_add(Size::S64, Location::GPR(tmp_base), Location::GPR(tmp_bound));
             a.emit_mov(Size::S32, addr, Location::GPR(tmp_addr));
 
             // This branch is used for emitting "faster" code for the special case of (offset + value_size) not exceeding u32 range.
@@ -1414,6 +1422,19 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
         a.emit_push(Size::S64, Location::GPR(GPR::RBP));
         a.emit_mov(Size::S64, Location::GPR(GPR::RSP), Location::GPR(GPR::RBP));
 
+        // Stack check.
+        if self.config.enforce_stack_check {
+            a.emit_cmp(
+                Size::S64,
+                Location::Memory(
+                    GPR::RDI, // first parameter is vmctx
+                    vm::Ctx::offset_stack_lower_bound() as i32,
+                ),
+                Location::GPR(GPR::RSP),
+            );
+            a.emit_conditional_trap(Condition::Below);
+        }
+
         self.locals = self
             .machine
             .init_locals(a, self.num_locals, self.num_params);
@@ -3307,33 +3328,23 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
             Operator::Nop => {}
             Operator::MemorySize { reserved } => {
                 let memory_index = MemoryIndex::new(reserved as usize);
-                let target: usize = match memory_index.local_or_import(module_info) {
-                    LocalOrImport::Local(local_mem_index) => {
-                        let mem_desc = &module_info.memories[local_mem_index];
-                        match mem_desc.memory_type() {
-                            MemoryType::Dynamic => vmcalls::local_dynamic_memory_size as usize,
-                            MemoryType::Static => vmcalls::local_static_memory_size as usize,
-                            MemoryType::SharedStatic => unimplemented!(),
-                        }
-                    }
-                    LocalOrImport::Import(import_mem_index) => {
-                        let mem_desc = &module_info.imported_memories[import_mem_index].1;
-                        match mem_desc.memory_type() {
-                            MemoryType::Dynamic => vmcalls::imported_dynamic_memory_size as usize,
-                            MemoryType::Static => vmcalls::imported_static_memory_size as usize,
-                            MemoryType::SharedStatic => unimplemented!(),
-                        }
-                    }
-                };
+                a.emit_mov(
+                    Size::S64,
+                    Location::Memory(
+                        Machine::get_vmctx_reg(),
+                        vm::Ctx::offset_intrinsics() as i32,
+                    ),
+                    Location::GPR(GPR::RAX),
+                );
+                a.emit_mov(
+                    Size::S64,
+                    Location::Memory(GPR::RAX, vm::Intrinsics::offset_memory_size() as i32),
+                    Location::GPR(GPR::RAX),
+                );
                 Self::emit_call_sysv(
                     a,
                     &mut self.machine,
                     |a| {
-                        a.emit_mov(
-                            Size::S64,
-                            Location::Imm64(target as u64),
-                            Location::GPR(GPR::RAX),
-                        );
                         a.emit_call_location(Location::GPR(GPR::RAX));
                     },
                     ::std::iter::once(Location::Imm32(memory_index.index() as u32)),
@@ -3344,40 +3355,30 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
             }
             Operator::MemoryGrow { reserved } => {
                 let memory_index = MemoryIndex::new(reserved as usize);
-                let target: usize = match memory_index.local_or_import(module_info) {
-                    LocalOrImport::Local(local_mem_index) => {
-                        let mem_desc = &module_info.memories[local_mem_index];
-                        match mem_desc.memory_type() {
-                            MemoryType::Dynamic => vmcalls::local_dynamic_memory_grow as usize,
-                            MemoryType::Static => vmcalls::local_static_memory_grow as usize,
-                            MemoryType::SharedStatic => unimplemented!(),
-                        }
-                    }
-                    LocalOrImport::Import(import_mem_index) => {
-                        let mem_desc = &module_info.imported_memories[import_mem_index].1;
-                        match mem_desc.memory_type() {
-                            MemoryType::Dynamic => vmcalls::imported_dynamic_memory_grow as usize,
-                            MemoryType::Static => vmcalls::imported_static_memory_grow as usize,
-                            MemoryType::SharedStatic => unimplemented!(),
-                        }
-                    }
-                };
-
                 let (param_pages, param_pages_lot) = self.value_stack.pop().unwrap();
 
                 if param_pages_lot == LocalOrTemp::Temp {
                     self.machine.release_locations_only_regs(&[param_pages]);
                 }
 
+                a.emit_mov(
+                    Size::S64,
+                    Location::Memory(
+                        Machine::get_vmctx_reg(),
+                        vm::Ctx::offset_intrinsics() as i32,
+                    ),
+                    Location::GPR(GPR::RAX),
+                );
+                a.emit_mov(
+                    Size::S64,
+                    Location::Memory(GPR::RAX, vm::Intrinsics::offset_memory_grow() as i32),
+                    Location::GPR(GPR::RAX),
+                );
+
                 Self::emit_call_sysv(
                     a,
                     &mut self.machine,
                     |a| {
-                        a.emit_mov(
-                            Size::S64,
-                            Location::Imm64(target as u64),
-                            Location::GPR(GPR::RAX),
-                        );
                         a.emit_call_location(Location::GPR(GPR::RAX));
                     },
                     ::std::iter::once(Location::Imm32(memory_index.index() as u32))
@@ -3400,6 +3401,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3425,6 +3427,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3450,6 +3453,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3476,6 +3480,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3502,6 +3507,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3528,6 +3534,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3554,6 +3561,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target_addr,
@@ -3579,6 +3587,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target_addr,
@@ -3604,6 +3613,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target_addr,
@@ -3629,6 +3639,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target_addr,
@@ -3654,6 +3665,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3679,6 +3691,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3704,6 +3717,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3730,6 +3744,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3756,6 +3771,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3782,6 +3798,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3808,6 +3825,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3839,6 +3857,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target,
@@ -3865,6 +3884,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target_addr,
@@ -3890,6 +3910,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target_addr,
@@ -3915,6 +3936,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target_addr,
@@ -3940,6 +3962,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target_addr,
@@ -3965,6 +3988,7 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
 
                 Self::emit_memory_op(
                     module_info,
+                    &self.config,
                     a,
                     &mut self.machine,
                     target_addr,
@@ -4061,7 +4085,8 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
                 let (targets, default_target) = table.read_table().unwrap();
                 let cond =
                     get_location_released(a, &mut self.machine, self.value_stack.pop().unwrap());
-                let mut table = vec![0usize; targets.len()];
+                let table_label = a.get_label();
+                let mut table: Vec<DynamicLabel> = vec![];
                 let default_br = a.get_label();
                 Self::emit_relaxed_binop(
                     a,
@@ -4073,19 +4098,16 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
                 );
                 a.emit_jmp(Condition::AboveEqual, default_br);
 
-                a.emit_mov(
-                    Size::S64,
-                    Location::Imm64(table.as_ptr() as usize as u64),
-                    Location::GPR(GPR::RCX),
-                );
+                a.emit_lea_label(table_label, Location::GPR(GPR::RCX));
                 a.emit_mov(Size::S32, cond, Location::GPR(GPR::RDX));
-                a.emit_shl(Size::S32, Location::Imm8(3), Location::GPR(GPR::RDX));
+                a.emit_imul_imm32_gpr64(5, GPR::RDX);
                 a.emit_add(Size::S64, Location::GPR(GPR::RCX), Location::GPR(GPR::RDX));
-                a.emit_jmp_location(Location::Memory(GPR::RDX, 0));
+                a.emit_jmp_location(Location::GPR(GPR::RDX));
 
-                for (i, target) in targets.iter().enumerate() {
-                    let AssemblyOffset(offset) = a.offset();
-                    table[i] = offset;
+                for target in targets.iter() {
+                    let label = a.get_label();
+                    a.emit_label(label);
+                    table.push(label);
                     let frame =
                         &self.control_stack[self.control_stack.len() - 1 - (*target as usize)];
                     if !frame.loop_like && frame.returns.len() > 0 {
@@ -4120,7 +4142,10 @@ impl FunctionCodeGenerator<CodegenError> for X64FunctionCode {
                     a.emit_jmp(Condition::None, frame.label);
                 }
 
-                self.br_table_data.as_mut().unwrap().push(table);
+                a.emit_label(table_label);
+                for x in table {
+                    a.emit_jmp(Condition::None, x);
+                }
                 self.unreachable_depth = 1;
             }
             Operator::Drop => {
diff --git a/lib/singlepass-backend/src/emitter_x64.rs b/lib/singlepass-backend/src/emitter_x64.rs
index 889b1099db1..f94de7013b3 100644
--- a/lib/singlepass-backend/src/emitter_x64.rs
+++ b/lib/singlepass-backend/src/emitter_x64.rs
@@ -89,6 +89,8 @@ pub trait Emitter {
     fn get_label(&mut self) -> Self::Label;
     fn get_offset(&mut self) -> Self::Offset;
 
+    fn emit_u64(&mut self, x: u64);
+
     fn emit_label(&mut self, label: Self::Label);
 
     fn emit_mov(&mut self, sz: Size, src: Location, dst: Location);
@@ -490,6 +492,10 @@ impl Emitter for Assembler {
         self.offset()
     }
 
+    fn emit_u64(&mut self, x: u64) {
+        self.push_u64(x);
+    }
+
     fn emit_label(&mut self, label: Self::Label) {
         dynasm!(self ; => label);
     }
diff --git a/src/bin/kwasmd.rs b/src/bin/kwasmd.rs
new file mode 100644
index 00000000000..53e69060eab
--- /dev/null
+++ b/src/bin/kwasmd.rs
@@ -0,0 +1,166 @@
+extern crate byteorder;
+extern crate structopt;
+
+use std::thread;
+use structopt::StructOpt;
+use wasmer::*;
+use wasmer_runtime::Value;
+use wasmer_runtime_core::{
+    self,
+    backend::{CompilerConfig, MemoryBoundCheckMode},
+    loader::Instance as LoadedInstance,
+};
+#[cfg(feature = "loader:kernel")]
+use wasmer_singlepass_backend::SinglePassCompiler;
+
+use std::io::prelude::*;
+#[cfg(feature = "loader:kernel")]
+use std::os::unix::net::{UnixListener, UnixStream};
+
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+
+#[derive(Debug, StructOpt)]
+#[structopt(name = "kwasmd", about = "Kernel-mode WebAssembly service.")]
+enum CLIOptions {
+    #[structopt(name = "listen")]
+    Listen(Listen),
+}
+
+#[derive(Debug, StructOpt)]
+struct Listen {
+    #[structopt(long = "socket")]
+    socket: String,
+}
+
+const CMD_RUN_CODE: u32 = 0x901;
+const CMD_READ_MEMORY: u32 = 0x902;
+const CMD_WRITE_MEMORY: u32 = 0x903;
+
+#[cfg(feature = "loader:kernel")]
+fn handle_client(mut stream: UnixStream) {
+    let binary_size = stream.read_u32::<LittleEndian>().unwrap();
+    if binary_size > 1048576 * 16 {
+        println!("binary too large");
+        return;
+    }
+    let mut wasm_binary: Vec<u8> = Vec::with_capacity(binary_size as usize);
+    unsafe { wasm_binary.set_len(binary_size as usize) };
+    stream.read_exact(&mut wasm_binary).unwrap();
+    let module = webassembly::compile_with_config_with(
+        &wasm_binary[..],
+        CompilerConfig {
+            symbol_map: None,
+            memory_bound_check_mode: MemoryBoundCheckMode::Disable,
+            enforce_stack_check: true,
+        },
+        &SinglePassCompiler::new(),
+    )
+    .unwrap();
+
+    let mut import_object = wasmer_runtime_core::import::ImportObject::new();
+    import_object.allow_missing_functions = true; // Import initialization might be left to the loader.
+    let instance = module.instantiate(&import_object).unwrap();
+    let mut ins = instance.load(::wasmer_kernel_loader::KernelLoader).unwrap();
+
+    loop {
+        let cmd = stream.read_u32::<LittleEndian>().unwrap();
+        match cmd {
+            CMD_RUN_CODE => {
+                let func_name_len = stream.read_u32::<LittleEndian>().unwrap();
+                if func_name_len > 32 {
+                    println!("function name too long");
+                    return;
+                }
+                let mut func_name: Vec<u8> = Vec::with_capacity(func_name_len as usize);
+                unsafe { func_name.set_len(func_name_len as usize) };
+                stream.read_exact(&mut func_name).unwrap();
+                let func_name = ::std::str::from_utf8(&func_name).unwrap();
+                let arg_count = stream.read_u32::<LittleEndian>().unwrap();
+                if arg_count > 0 {
+                    println!("Too many arguments");
+                    return;
+                }
+                let mut args: Vec<Value> = Vec::with_capacity(arg_count as usize);
+                for _ in 0..arg_count {
+                    args.push(Value::I64(stream.read_u64::<LittleEndian>().unwrap() as _));
+                }
+
+                let index = instance.resolve_func(func_name).unwrap();
+                let ret = ins.call(index, &args);
+                match ret {
+                    Ok(x) => {
+                        stream.write_u32::<LittleEndian>(1).unwrap();
+                        stream.write_u64::<LittleEndian>(x).unwrap();
+                    }
+                    Err(e) => {
+                        println!("Execution error: {:?}", e);
+                        stream.write_u32::<LittleEndian>(0).unwrap();
+                    }
+                }
+            }
+            CMD_READ_MEMORY => {
+                let offset = stream.read_u32::<LittleEndian>().unwrap();
+                let len = stream.read_u32::<LittleEndian>().unwrap();
+                if len > 1048576 * 16 {
+                    println!("memory size too large");
+                    return;
+                }
+                let buf = ins.read_memory(offset, len).unwrap();
+                stream.write_all(&buf).unwrap();
+            }
+            CMD_WRITE_MEMORY => {
+                let offset = stream.read_u32::<LittleEndian>().unwrap();
+                let len = stream.read_u32::<LittleEndian>().unwrap();
+                if len > 1048576 * 16 {
+                    println!("memory size too large");
+                    return;
+                }
+                let mut buf: Vec<u8> = Vec::with_capacity(len as usize);
+                unsafe { buf.set_len(len as usize) };
+                stream.read_exact(&mut buf).unwrap();
+                ins.write_memory(offset, len, &buf).unwrap();
+            }
+            _ => {
+                println!("Unknown command");
+                return;
+            }
+        }
+    }
+}
+
+#[cfg(feature = "loader:kernel")]
+fn run_listen(opts: Listen) {
+    let listener = UnixListener::bind(&opts.socket).unwrap();
+    for stream in listener.incoming() {
+        match stream {
+            Ok(stream) => {
+                thread::spawn(|| {
+                    match ::std::panic::catch_unwind(::std::panic::AssertUnwindSafe(|| {
+                        handle_client(stream);
+                    })) {
+                        Ok(()) => {}
+                        Err(_) => {}
+                    }
+                });
+            }
+            Err(err) => {
+                panic!("{:?}", err);
+            }
+        }
+    }
+}
+
+#[cfg(feature = "loader:kernel")]
+fn main() {
+    let options = CLIOptions::from_args();
+    match options {
+        CLIOptions::Listen(listen) => {
+            run_listen(listen);
+        }
+    }
+}
+
+#[cfg(not(feature = "loader:kernel"))]
+fn main() {
+    panic!("Kwasm loader is not enabled during compilation.");
+}
diff --git a/src/bin/wasmer.rs b/src/bin/wasmer.rs
index 14386d1b18b..8231c60b410 100644
--- a/src/bin/wasmer.rs
+++ b/src/bin/wasmer.rs
@@ -24,7 +24,8 @@ use wasmer_runtime::{
 };
 use wasmer_runtime_core::{
     self,
-    backend::{Compiler, CompilerConfig},
+    backend::{Compiler, CompilerConfig, MemoryBoundCheckMode},
+    loader::{Instance as LoadedInstance, LocalLoader},
 };
 #[cfg(feature = "backend:singlepass")]
 use wasmer_singlepass_backend::SinglePassCompiler;
@@ -96,6 +97,13 @@ struct Run {
     #[structopt(long = "dir", multiple = true, group = "wasi")]
     pre_opened_directories: Vec<String>,
 
+    // Custom code loader
+    #[structopt(
+        long = "loader",
+        raw(possible_values = "LoaderName::variants()", case_insensitive = "true")
+    )]
+    loader: Option<LoaderName>,
+
     #[structopt(long = "command-name", hidden = true)]
     command_name: Option<String>,
 
@@ -104,6 +112,36 @@ struct Run {
     args: Vec<String>,
 }
 
+#[allow(dead_code)]
+#[derive(Debug, Copy, Clone)]
+enum LoaderName {
+    Local,
+    #[cfg(feature = "loader:kernel")]
+    Kernel,
+}
+
+impl LoaderName {
+    pub fn variants() -> &'static [&'static str] {
+        &[
+            "local",
+            #[cfg(feature = "loader:kernel")]
+            "kernel",
+        ]
+    }
+}
+
+impl FromStr for LoaderName {
+    type Err = String;
+    fn from_str(s: &str) -> Result<LoaderName, String> {
+        match s.to_lowercase().as_str() {
+            "local" => Ok(LoaderName::Local),
+            #[cfg(feature = "loader:kernel")]
+            "kernel" => Ok(LoaderName::Kernel),
+            _ => Err(format!("The loader {} doesn't exist", s)),
+        }
+    }
+}
+
 #[allow(dead_code)]
 #[derive(Debug)]
 enum Backend {
@@ -258,7 +296,38 @@ fn execute_wasm(options: &Run) -> Result<(), String> {
         Backend::LLVM => return Err("the llvm backend is not enabled".to_string()),
     };
 
-    let module = if !disable_cache {
+    #[cfg(feature = "loader:kernel")]
+    let is_kernel_loader = if let Some(LoaderName::Kernel) = options.loader {
+        true
+    } else {
+        false
+    };
+
+    #[cfg(not(feature = "loader:kernel"))]
+    let is_kernel_loader = false;
+
+    let module = if is_kernel_loader {
+        webassembly::compile_with_config_with(
+            &wasm_binary[..],
+            CompilerConfig {
+                symbol_map: em_symbol_map,
+                memory_bound_check_mode: MemoryBoundCheckMode::Disable,
+                enforce_stack_check: true,
+            },
+            &*compiler,
+        )
+        .map_err(|e| format!("Can't compile module: {:?}", e))?
+    } else if disable_cache {
+        webassembly::compile_with_config_with(
+            &wasm_binary[..],
+            CompilerConfig {
+                symbol_map: em_symbol_map,
+                ..Default::default()
+            },
+            &*compiler,
+        )
+        .map_err(|e| format!("Can't compile module: {:?}", e))?
+    } else {
         // If we have cache enabled
 
         // We generate a hash for the given binary, so we can use it as key
@@ -287,6 +356,7 @@ fn execute_wasm(options: &Run) -> Result<(), String> {
                     &wasm_binary[..],
                     CompilerConfig {
                         symbol_map: em_symbol_map,
+                        ..Default::default()
                     },
                     &*compiler,
                 )
@@ -298,17 +368,46 @@ fn execute_wasm(options: &Run) -> Result<(), String> {
             }
         };
         module
-    } else {
-        webassembly::compile_with_config_with(
-            &wasm_binary[..],
-            CompilerConfig {
-                symbol_map: em_symbol_map,
-            },
-            &*compiler,
-        )
-        .map_err(|e| format!("Can't compile module: {:?}", e))?
     };
 
+    if let Some(loader) = options.loader {
+        let mut import_object = wasmer_runtime_core::import::ImportObject::new();
+        import_object.allow_missing_functions = true; // Import initialization might be left to the loader.
+        let instance = module
+            .instantiate(&import_object)
+            .map_err(|e| format!("Can't instantiate module: {:?}", e))?;
+
+        let args: Vec<Value> = options
+            .args
+            .iter()
+            .map(|arg| arg.as_str())
+            .map(|x| {
+                Value::I32(x.parse().expect(&format!(
+                    "Can't parse the provided argument {:?} as a integer",
+                    x
+                )))
+            })
+            .collect();
+        let index = instance
+            .resolve_func("_start")
+            .expect("The loader requires a _start function to be present in the module");
+        let mut ins: Box<LoadedInstance<Error = String>> = match loader {
+            LoaderName::Local => Box::new(
+                instance
+                    .load(LocalLoader)
+                    .expect("Can't use the local loader"),
+            ),
+            #[cfg(feature = "loader:kernel")]
+            LoaderName::Kernel => Box::new(
+                instance
+                    .load(::wasmer_kernel_loader::KernelLoader)
+                    .expect("Can't use the kernel loader"),
+            ),
+        };
+        println!("{:?}", ins.call(index, &args));
+        return Ok(());
+    }
+
     // TODO: refactor this
     if wasmer_emscripten::is_emscripten_module(&module) {
         let mut emscripten_globals = wasmer_emscripten::EmscriptenGlobals::new(&module);