Rollup of 7 pull requests

Cargo.lock

@@ -1835,7 +1835,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "openssl-src"
-version = "111.1.0+1.1.1a"
+version = "111.3.0+1.1.1c"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1848,7 +1848,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-src 111.1.0+1.1.1a (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-src 111.3.0+1.1.1c (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)",
@@ -4384,7 +4384,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum opener 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "998c59e83d9474c01127a96e023b7a04bb061dd286bf8bb939d31dc8d31a7448"
 "checksum openssl 0.10.16 (registry+https://github.com/rust-lang/crates.io-index)" = "ec7bd7ca4cce6dbdc77e7c1230682740d307d1218a87fb0349a571272be749f9"
 "checksum openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "77af24da69f9d9341038eba93a073b1fdaaa1b788221b00a69bce9e762cb32de"
-"checksum openssl-src 111.1.0+1.1.1a (registry+https://github.com/rust-lang/crates.io-index)" = "26bb632127731bf4ac49bf86a5dde12d2ca0918c2234fc39d79d4da2ccbc6da7"
+"checksum openssl-src 111.3.0+1.1.1c (registry+https://github.com/rust-lang/crates.io-index)" = "53ed5f31d294bdf5f7a4ba0a206c2754b0f60e9a63b7e3076babc5317873c797"
 "checksum openssl-sys 0.9.43 (registry+https://github.com/rust-lang/crates.io-index)" = "33c86834957dd5b915623e94f2f4ab2c70dd8f6b70679824155d5ae21dbd495d"
 "checksum ordermap 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "a86ed3f5f244b372d6b1a00b72ef7f8876d0bc6a78a4c9985c53614041512063"
 "checksum ordslice 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dd20eec3dbe4376829cb7d80ae6ac45e0a766831dca50202ff2d40db46a8a024"

src/liballoc/tests/heap.rs

@@ -1,6 +1,6 @@
 use std::alloc::{Global, Alloc, Layout, System};
 
-/// Issue #45955.
+/// Issue #45955 and #62251.
 #[test]
 fn alloc_system_overaligned_request() {
     check_overalign_requests(System)
@@ -12,21 +12,23 @@ fn std_heap_overaligned_request() {
 }
 
 fn check_overalign_requests<T: Alloc>(mut allocator: T) {
-    let size = 8;
-    let align = 16; // greater than size
-    let iterations = 100;
-    unsafe {
-        let pointers: Vec<_> = (0..iterations).map(|_| {
-            allocator.alloc(Layout::from_size_align(size, align).unwrap()).unwrap()
-        }).collect();
-        for &ptr in &pointers {
-            assert_eq!((ptr.as_ptr() as usize) % align, 0,
-                       "Got a pointer less aligned than requested")
-        }
+    for &align in &[4, 8, 16, 32] { // less than and bigger than `MIN_ALIGN`
+        for &size in &[align/2, align-1] { // size less than alignment
+            let iterations = 128;
+            unsafe {
+                let pointers: Vec<_> = (0..iterations).map(|_| {
+                    allocator.alloc(Layout::from_size_align(size, align).unwrap()).unwrap()
+                }).collect();
+                for &ptr in &pointers {
+                    assert_eq!((ptr.as_ptr() as usize) % align, 0,
+                               "Got a pointer less aligned than requested")
+                }
 
-        // Clean up
-        for &ptr in &pointers {
-            allocator.dealloc(ptr, Layout::from_size_align(size, align).unwrap())
+                // Clean up
+                for &ptr in &pointers {
+                    allocator.dealloc(ptr, Layout::from_size_align(size, align).unwrap())
+                }
+            }
         }
     }
 }

src/librustc_mir/const_eval.rs

@@ -11,7 +11,7 @@ use rustc::hir::def::DefKind;
 use rustc::hir::def_id::DefId;
 use rustc::mir::interpret::{ConstEvalErr, ErrorHandled, ScalarMaybeUndef};
 use rustc::mir;
-use rustc::ty::{self, TyCtxt, query::TyCtxtAt};
+use rustc::ty::{self, TyCtxt};
 use rustc::ty::layout::{self, LayoutOf, VariantIdx};
 use rustc::ty::subst::Subst;
 use rustc::traits::Reveal;
@@ -23,7 +23,7 @@ use crate::interpret::{self,
     PlaceTy, MPlaceTy, OpTy, ImmTy, Immediate, Scalar,
     RawConst, ConstValue,
     InterpResult, InterpErrorInfo, InterpError, GlobalId, InterpCx, StackPopCleanup,
-    Allocation, AllocId, MemoryKind, Memory,
+    Allocation, AllocId, MemoryKind,
     snapshot, RefTracking, intern_const_alloc_recursive,
 };
 
@@ -316,6 +316,7 @@ impl interpret::MayLeak for ! {
 impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir, 'tcx> {
     type MemoryKinds = !;
     type PointerTag = ();
+    type ExtraFnVal = !;
 
     type FrameExtra = ();
     type MemoryExtra = ();
@@ -370,6 +371,16 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
         }))
     }
 
+    fn call_extra_fn(
+        _ecx: &mut InterpCx<'mir, 'tcx, Self>,
+        fn_val: !,
+        _args: &[OpTy<'tcx>],
+        _dest: Option<PlaceTy<'tcx>>,
+        _ret: Option<mir::BasicBlock>,
+    ) -> InterpResult<'tcx> {
+        match fn_val {}
+    }
+
     fn call_intrinsic(
         ecx: &mut InterpCx<'mir, 'tcx, Self>,
         instance: ty::Instance<'tcx>,
@@ -398,27 +409,27 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
     }
 
     fn find_foreign_static(
+        _tcx: TyCtxt<'tcx>,
         _def_id: DefId,
-        _tcx: TyCtxtAt<'tcx>,
     ) -> InterpResult<'tcx, Cow<'tcx, Allocation<Self::PointerTag>>> {
         err!(ReadForeignStatic)
     }
 
     #[inline(always)]
     fn tag_allocation<'b>(
+        _memory_extra: &(),
         _id: AllocId,
         alloc: Cow<'b, Allocation>,
         _kind: Option<MemoryKind<!>>,
-        _memory: &Memory<'mir, 'tcx, Self>,
     ) -> (Cow<'b, Allocation<Self::PointerTag>>, Self::PointerTag) {
         // We do not use a tag so we can just cheaply forward the allocation
         (alloc, ())
     }
 
     #[inline(always)]
     fn tag_static_base_pointer(
+        _memory_extra: &(),
         _id: AllocId,
-        _memory: &Memory<'mir, 'tcx, Self>,
     ) -> Self::PointerTag {
         ()
     }

src/librustc_mir/interpret/cast.rs

@@ -11,7 +11,7 @@ use rustc::mir::interpret::{
 };
 use rustc::mir::CastKind;
 
-use super::{InterpCx, Machine, PlaceTy, OpTy, Immediate};
+use super::{InterpCx, Machine, PlaceTy, OpTy, Immediate, FnVal};
 
 impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
     fn type_is_fat_ptr(&self, ty: Ty<'tcx>) -> bool {
@@ -86,7 +86,7 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                             def_id,
                             substs,
                         ).ok_or_else(|| InterpError::TooGeneric.into());
-                        let fn_ptr = self.memory.create_fn_alloc(instance?);
+                        let fn_ptr = self.memory.create_fn_alloc(FnVal::Instance(instance?));
                         self.write_scalar(Scalar::Ptr(fn_ptr.into()), dest)?;
                     }
                     _ => bug!("reify fn pointer on {:?}", src.layout.ty),
@@ -115,7 +115,7 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                             substs,
                             ty::ClosureKind::FnOnce,
                         );
-                        let fn_ptr = self.memory.create_fn_alloc(instance);
+                        let fn_ptr = self.memory.create_fn_alloc(FnVal::Instance(instance));
                         let val = Immediate::Scalar(Scalar::Ptr(fn_ptr.into()).into());
                         self.write_immediate(val, dest)?;
                     }

src/librustc_mir/interpret/eval_context.rs

@@ -222,6 +222,23 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         &mut self.memory
     }
 
+    #[inline(always)]
+    pub fn force_ptr(
+        &self,
+        scalar: Scalar<M::PointerTag>,
+    ) -> InterpResult<'tcx, Pointer<M::PointerTag>> {
+        self.memory.force_ptr(scalar)
+    }
+
+    #[inline(always)]
+    pub fn force_bits(
+        &self,
+        scalar: Scalar<M::PointerTag>,
+        size: Size
+    ) -> InterpResult<'tcx, u128> {
+        self.memory.force_bits(scalar, size)
+    }
+
     #[inline(always)]
     pub fn tag_static_base_pointer(&self, ptr: Pointer) -> Pointer<M::PointerTag> {
         self.memory.tag_static_base_pointer(ptr)
@@ -253,6 +270,27 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         self.frame().body
     }
 
+    #[inline(always)]
+    pub fn sign_extend(&self, value: u128, ty: TyLayout<'_>) -> u128 {
+        assert!(ty.abi.is_signed());
+        sign_extend(value, ty.size)
+    }
+
+    #[inline(always)]
+    pub fn truncate(&self, value: u128, ty: TyLayout<'_>) -> u128 {
+        truncate(value, ty.size)
+    }
+
+    #[inline]
+    pub fn type_is_sized(&self, ty: Ty<'tcx>) -> bool {
+        ty.is_sized(self.tcx, self.param_env)
+    }
+
+    #[inline]
+    pub fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool {
+        ty.is_freeze(*self.tcx, self.param_env, DUMMY_SP)
+    }
+
     pub(super) fn subst_and_normalize_erasing_regions<T: TypeFoldable<'tcx>>(
         &self,
         substs: T,
@@ -288,14 +326,6 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         ).ok_or_else(|| InterpError::TooGeneric.into())
     }
 
-    pub fn type_is_sized(&self, ty: Ty<'tcx>) -> bool {
-        ty.is_sized(self.tcx, self.param_env)
-    }
-
-    pub fn type_is_freeze(&self, ty: Ty<'tcx>) -> bool {
-        ty.is_freeze(*self.tcx, self.param_env, DUMMY_SP)
-    }
-
     pub fn load_mir(
         &self,
         instance: ty::InstanceDef<'tcx>,
@@ -766,32 +796,4 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         trace!("generate stacktrace: {:#?}, {:?}", frames, explicit_span);
         frames
     }
-
-    #[inline(always)]
-    pub fn sign_extend(&self, value: u128, ty: TyLayout<'_>) -> u128 {
-        assert!(ty.abi.is_signed());
-        sign_extend(value, ty.size)
-    }
-
-    #[inline(always)]
-    pub fn truncate(&self, value: u128, ty: TyLayout<'_>) -> u128 {
-        truncate(value, ty.size)
-    }
-
-    #[inline(always)]
-    pub fn force_ptr(
-        &self,
-        scalar: Scalar<M::PointerTag>,
-    ) -> InterpResult<'tcx, Pointer<M::PointerTag>> {
-        self.memory.force_ptr(scalar)
-    }
-
-    #[inline(always)]
-    pub fn force_bits(
-        &self,
-        scalar: Scalar<M::PointerTag>,
-        size: Size
-    ) -> InterpResult<'tcx, u128> {
-        self.memory.force_bits(scalar, size)
-    }
 }

src/librustc_mir/interpret/machine.rs

@@ -7,11 +7,11 @@ use std::hash::Hash;
 
 use rustc::hir::def_id::DefId;
 use rustc::mir;
-use rustc::ty::{self, query::TyCtxtAt};
+use rustc::ty::{self, TyCtxt};
 
 use super::{
-    Allocation, AllocId, InterpResult, Scalar, AllocationExtra,
-    InterpCx, PlaceTy, OpTy, ImmTy, MemoryKind, Pointer, Memory
+    Allocation, AllocId, InterpResult, InterpError, Scalar, AllocationExtra,
+    InterpCx, PlaceTy, OpTy, ImmTy, MemoryKind, Pointer, Memory,
 };
 
 /// Whether this kind of memory is allowed to leak
@@ -67,6 +67,11 @@ pub trait Machine<'mir, 'tcx>: Sized {
     /// The `default()` is used for pointers to consts, statics, vtables and functions.
     type PointerTag: ::std::fmt::Debug + Copy + Eq + Hash + 'static;
 
+    /// Machines can define extra (non-instance) things that represent values of function pointers.
+    /// For example, Miri uses this to return a fucntion pointer from `dlsym`
+    /// that can later be called to execute the right thing.
+    type ExtraFnVal: ::std::fmt::Debug + Copy;
+
     /// Extra data stored in every call frame.
     type FrameExtra;
 
@@ -119,6 +124,16 @@ pub trait Machine<'mir, 'tcx>: Sized {
         ret: Option<mir::BasicBlock>,
     ) -> InterpResult<'tcx, Option<&'mir mir::Body<'tcx>>>;
 
+    /// Execute `fn_val`.  it is the hook's responsibility to advance the instruction
+    /// pointer as appropriate.
+    fn call_extra_fn(
+        ecx: &mut InterpCx<'mir, 'tcx, Self>,
+        fn_val: Self::ExtraFnVal,
+        args: &[OpTy<'tcx, Self::PointerTag>],
+        dest: Option<PlaceTy<'tcx, Self::PointerTag>>,
+        ret: Option<mir::BasicBlock>,
+    ) -> InterpResult<'tcx>;
+
     /// Directly process an intrinsic without pushing a stack frame.
     /// If this returns successfully, the engine will take care of jumping to the next block.
     fn call_intrinsic(
@@ -136,8 +151,8 @@ pub trait Machine<'mir, 'tcx>: Sized {
     ///
     /// This allocation will then be fed to `tag_allocation` to initialize the "extra" state.
     fn find_foreign_static(
+        tcx: TyCtxt<'tcx>,
         def_id: DefId,
-        tcx: TyCtxtAt<'tcx>,
     ) -> InterpResult<'tcx, Cow<'tcx, Allocation>>;
 
     /// Called for all binary operations on integer(-like) types when one operand is a pointer
@@ -174,10 +189,10 @@ pub trait Machine<'mir, 'tcx>: Sized {
     /// For static allocations, the tag returned must be the same as the one returned by
     /// `tag_static_base_pointer`.
     fn tag_allocation<'b>(
+        memory_extra: &Self::MemoryExtra,
         id: AllocId,
         alloc: Cow<'b, Allocation>,
         kind: Option<MemoryKind<Self::MemoryKinds>>,
-        memory: &Memory<'mir, 'tcx, Self>,
     ) -> (Cow<'b, Allocation<Self::PointerTag, Self::AllocExtra>>, Self::PointerTag);
 
     /// Return the "base" tag for the given static allocation: the one that is used for direct
@@ -186,8 +201,8 @@ pub trait Machine<'mir, 'tcx>: Sized {
     /// Be aware that requesting the `Allocation` for that `id` will lead to cycles
     /// for cyclic statics!
     fn tag_static_base_pointer(
+        memory_extra: &Self::MemoryExtra,
         id: AllocId,
-        memory: &Memory<'mir, 'tcx, Self>,
     ) -> Self::PointerTag;
 
     /// Executes a retagging operation
@@ -209,20 +224,22 @@ pub trait Machine<'mir, 'tcx>: Sized {
         extra: Self::FrameExtra,
     ) -> InterpResult<'tcx>;
 
+    #[inline(always)]
     fn int_to_ptr(
-        int: u64,
         _mem: &Memory<'mir, 'tcx, Self>,
+        int: u64,
     ) -> InterpResult<'tcx, Pointer<Self::PointerTag>> {
-        if int == 0 {
-            err!(InvalidNullPointerUsage)
+        Err((if int == 0 {
+            InterpError::InvalidNullPointerUsage
         } else {
-            err!(ReadBytesAsPointer)
-        }
+            InterpError::ReadBytesAsPointer
+        }).into())
     }
 
+    #[inline(always)]
     fn ptr_to_int(
-        _ptr: Pointer<Self::PointerTag>,
         _mem: &Memory<'mir, 'tcx, Self>,
+        _ptr: Pointer<Self::PointerTag>,
     ) -> InterpResult<'tcx, u64> {
         err!(ReadPointerAsBytes)
     }