feat: support for Windows

* fix (loader): default loader now has build tag: for linux and darwin
* feat (loader): add memory allocator support for Windows

internal/loader/loader.go

@@ -1,3 +1,6 @@
+//go:build linux || darwin
+// +build linux darwin
+
 /*
  * Copyright 2021 ByteDance Inc.
  *

internal/loader/loader_windows_amd64.go

@@ -0,0 +1,112 @@
+/*
+ * Copyright 2021 ByteDance Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package loader
+
+import (
+    `fmt`
+    `os`
+    `reflect`
+    `syscall`
+    `unsafe`
+)
+
+const (
+    MEM_COMMIT  = 0x00001000
+    MEM_RESERVE = 0x00002000
+)
+
+var (
+    libKernel32                = syscall.NewLazyDLL("KERNEL32.DLL")
+    libKernel32_VirtualAlloc   = libKernel32.NewProc("VirtualAlloc")
+    libKernel32_VirtualProtect = libKernel32.NewProc("VirtualProtect")
+)
+
+type Loader   []byte
+type Function unsafe.Pointer
+
+func (self Loader) LoadWithFaker(fn string, fp int, args int, faker interface{}) (f Function) {
+    p := os.Getpagesize()
+    n := (((len(self) - 1) / p) + 1) * p
+
+    /* register the function */
+    m := mmap(n)
+    v := fmt.Sprintf("runtime.__%s_%x", fn, m)
+    argsptr, localsptr := stackMap(faker)
+    registerFunction(v, m, uintptr(n), fp, args, uintptr(len(self)), argsptr, localsptr)
+
+    /* reference as a slice */
+    s := *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader {
+        Data : m,
+        Cap  : n,
+        Len  : len(self),
+    }))
+
+    /* copy the machine code, and make it executable */
+    copy(s, self)
+    mprotect(m, n)
+    return Function(&m)
+}
+
+func (self Loader) Load(fn string, fp int, args int) (f Function) {
+    return self.LoadWithFaker(fn, fp, args, func(){})
+}
+
+func mmap(nb int) uintptr {
+    addr, err := winapi_VirtualAlloc(0, nb, MEM_COMMIT|MEM_RESERVE, syscall.PAGE_READWRITE)
+    if err != nil {
+        panic(err)
+    }
+    return addr
+}
+
+func mprotect(p uintptr, nb int) (oldProtect int) {
+    err := winapi_VirtualProtect(p, nb, syscall.PAGE_EXECUTE_READ, &oldProtect)
+    if err != nil {
+        panic(err)
+    }
+    return
+}
+
+// winapi_VirtualAlloc allocate memory
+// Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualalloc
+func winapi_VirtualAlloc(lpAddr uintptr, dwSize int, flAllocationType int, flProtect int) (uintptr, error) {
+    r1, _, err := libKernel32_VirtualAlloc.Call(
+        lpAddr,
+        uintptr(dwSize),
+        uintptr(flAllocationType),
+        uintptr(flProtect),
+    )
+    if r1 == 0 {
+        return 0, err
+    }
+    return r1, nil
+}
+
+// winapi_VirtualProtect change memory protection
+// Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualprotect
+func winapi_VirtualProtect(lpAddr uintptr, dwSize int, flNewProtect int, lpflOldProtect *int) error {
+    r1, _, err := libKernel32_VirtualProtect.Call(
+        lpAddr,
+        uintptr(dwSize),
+        uintptr(flNewProtect),
+        uintptr(unsafe.Pointer(lpflOldProtect)),
+    )
+    if r1 == 0 {
+        return err
+    }
+    return nil
+}

issue_test/plugin_test.go

@@ -1,4 +1,5 @@
-// +build !race
+//go:build (linux && !race) || (unix && !race)
+// +build linux,!race unix,!race
 
 /*
  * Copyright 2021 ByteDance Inc.
@@ -23,9 +24,9 @@ import (
     `fmt`
     `os/exec`
     `plugin`
+    `reflect`
     `runtime`
     `testing`
-    `reflect`
 
     _ `github.com/bytedance/sonic`
 )
@@ -37,8 +38,8 @@ func buildPlugin() {
         panic(err)
     }
     cmd0 := exec.Cmd{
-        Path: bin0,
-        Args: []string{"rm", "-f", "plugin/plugin."+runtime.Version()+".so"},
+        Path:   bin0,
+        Args:   []string{"rm", "-f", "plugin/plugin." + runtime.Version() + ".so"},
         Stdout: out,
         Stderr: out,
     }
@@ -51,8 +52,8 @@ func buildPlugin() {
         panic(err)
     }
     cmd := exec.Cmd{
-        Path: bin,
-        Args: []string{"go", "build", "-buildmode", "plugin", "-o", "plugin/plugin."+runtime.Version()+".so", "plugin/main.go"},
+        Path:   bin,
+        Args:   []string{"go", "build", "-buildmode", "plugin", "-o", "plugin/plugin." + runtime.Version() + ".so", "plugin/main.go"},
         Stdout: out,
         Stderr: out,
     }
@@ -61,10 +62,9 @@ func buildPlugin() {
     }
 }
 
-
 func TestPlugin(t *testing.T) {
     buildPlugin()
-    p, err := plugin.Open("plugin/plugin."+runtime.Version()+".so")
+    p, err := plugin.Open("plugin/plugin." + runtime.Version() + ".so")
     if err != nil {
         t.Fatal(err)
     }