js/src/jit/x86/SharedICHelpers-x86.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: set ts=8 sts=2 et sw=2 tw=80:
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef jit_x86_SharedICHelpers_x86_h
   8 #define jit_x86_SharedICHelpers_x86_h
   9
  10 #include "jit/BaselineIC.h"
  11 #include "jit/JitFrames.h"
  12 #include "jit/MacroAssembler.h"
  13 #include "jit/SharedICRegisters.h"
  14
  15 namespace js {
  16 namespace jit {
  17
  18 // Distance from stack top to the top Value inside an IC stub (this is the
  19 // return address).
  20 static const size_t ICStackValueOffset = sizeof(void*);
  21
  22 inline void EmitRestoreTailCallReg(MacroAssembler& masm) {
  23   masm.Pop(ICTailCallReg);
  24 }
  25
  26 inline void EmitRepushTailCallReg(MacroAssembler& masm) {
  27   masm.Push(ICTailCallReg);
  28 }
  29
  30 inline void EmitCallIC(MacroAssembler& masm, CodeOffset* callOffset) {
  31   // The stub pointer must already be in ICStubReg.
  32   // Call the stubcode.
  33   masm.call(Address(ICStubReg, ICStub::offsetOfStubCode()));
  34   *callOffset = CodeOffset(masm.currentOffset());
  35 }
  36
  37 inline void EmitReturnFromIC(MacroAssembler& masm) { masm.ret(); }
  38
  39 inline void EmitBaselineLeaveStubFrame(MacroAssembler& masm) {
  40   Address stubAddr(FramePointer, BaselineStubFrameLayout::ICStubOffsetFromFP);
  41   masm.loadPtr(stubAddr, ICStubReg);
  42
  43   masm.mov(FramePointer, StackPointer);
  44   masm.Pop(FramePointer);
  45
  46   // The return address is on top of the stack, followed by the frame
  47   // descriptor. Use a pop instruction to overwrite the frame descriptor
  48   // with the return address. Note that pop increments the stack pointer
  49   // before computing the address.
  50   masm.Pop(Operand(StackPointer, 0));
  51 }
  52
  53 template <typename AddrType>
  54 inline void EmitPreBarrier(MacroAssembler& masm, const AddrType& addr,
  55                            MIRType type) {
  56   masm.guardedCallPreBarrier(addr, type);
  57 }
  58
  59 inline void EmitStubGuardFailure(MacroAssembler& masm) {
  60   // Load next stub into ICStubReg
  61   masm.loadPtr(Address(ICStubReg, ICCacheIRStub::offsetOfNext()), ICStubReg);
  62
  63   // Return address is already loaded, just jump to the next stubcode.
  64   masm.jmp(Operand(ICStubReg, ICStub::offsetOfStubCode()));
  65 }
  66
  67 }  // namespace jit
  68 }  // namespace js
  69
  70 #endif /* jit_x86_SharedICHelpers_x86_h */