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JITOpcodes32_64.cpp
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1315 lines (1025 loc) · 48.1 KB
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/*
* Copyright (C) 2009, 2012, 2013, 2014, 2015 Apple Inc. All rights reserved.
* Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(JIT)
#if USE(JSVALUE32_64)
#include "JIT.h"
#include "CCallHelpers.h"
#include "Debugger.h"
#include "Exception.h"
#include "JITInlines.h"
#include "JSArray.h"
#include "JSArrowFunction.h"
#include "JSCell.h"
#include "JSEnvironmentRecord.h"
#include "JSFunction.h"
#include "JSPropertyNameEnumerator.h"
#include "LinkBuffer.h"
#include "MaxFrameExtentForSlowPathCall.h"
#include "SlowPathCall.h"
#include "TypeProfilerLog.h"
#include "VirtualRegister.h"
namespace JSC {
JIT::CodeRef JIT::privateCompileCTINativeCall(VM* vm, NativeFunction func)
{
Call nativeCall;
emitFunctionPrologue();
emitPutImmediateToCallFrameHeader(0, JSStack::CodeBlock);
storePtr(callFrameRegister, &m_vm->topCallFrame);
#if CPU(X86)
// Calling convention: f(ecx, edx, ...);
// Host function signature: f(ExecState*);
move(callFrameRegister, X86Registers::ecx);
subPtr(TrustedImm32(8), stackPointerRegister); // Align stack for call.
storePtr(X86Registers::ecx, Address(stackPointerRegister));
// call the function
nativeCall = call();
addPtr(TrustedImm32(8), stackPointerRegister);
#elif CPU(ARM) || CPU(SH4) || CPU(MIPS)
#if CPU(MIPS)
// Allocate stack space for (unused) 16 bytes (8-byte aligned) for 4 arguments.
subPtr(TrustedImm32(16), stackPointerRegister);
#endif
// Calling convention is f(argumentGPR0, argumentGPR1, ...).
// Host function signature is f(ExecState*).
move(callFrameRegister, argumentGPR0);
emitGetFromCallFrameHeaderPtr(JSStack::Callee, argumentGPR1);
loadPtr(Address(argumentGPR1, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
// call the function
nativeCall = call();
#if CPU(MIPS)
// Restore stack space
addPtr(TrustedImm32(16), stackPointerRegister);
#endif
restoreReturnAddressBeforeReturn(regT3);
#else
#error "JIT not supported on this platform."
abortWithReason(JITNotSupported);
#endif // CPU(X86)
// Check for an exception
Jump sawException = branch32(NotEqual, AbsoluteAddress(vm->addressOfException()), TrustedImm32(0));
emitFunctionEpilogue();
// Return.
ret();
// Handle an exception
sawException.link(this);
storePtr(callFrameRegister, &m_vm->topCallFrame);
#if CPU(X86)
addPtr(TrustedImm32(-4), stackPointerRegister);
loadPtr(Address(callFrameRegister), X86Registers::ecx);
push(X86Registers::ecx);
#else
loadPtr(Address(callFrameRegister), argumentGPR0);
#endif
move(TrustedImmPtr(FunctionPtr(operationVMHandleException).value()), regT3);
call(regT3);
#if CPU(X86)
addPtr(TrustedImm32(8), stackPointerRegister);
#endif
jumpToExceptionHandler();
// All trampolines constructed! copy the code, link up calls, and set the pointers on the Machine object.
LinkBuffer patchBuffer(*m_vm, *this, GLOBAL_THUNK_ID);
patchBuffer.link(nativeCall, FunctionPtr(func));
return FINALIZE_CODE(patchBuffer, ("JIT CTI native call"));
}
void JIT::emit_op_mov(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
if (m_codeBlock->isConstantRegisterIndex(src))
emitStore(dst, getConstantOperand(src));
else {
emitLoad(src, regT1, regT0);
emitStore(dst, regT1, regT0);
}
}
void JIT::emit_op_end(Instruction* currentInstruction)
{
ASSERT(returnValueGPR != callFrameRegister);
emitLoad(currentInstruction[1].u.operand, regT1, returnValueGPR);
emitRestoreCalleeSaves();
emitFunctionEpilogue();
ret();
}
void JIT::emit_op_jmp(Instruction* currentInstruction)
{
unsigned target = currentInstruction[1].u.operand;
addJump(jump(), target);
}
void JIT::emit_op_new_object(Instruction* currentInstruction)
{
Structure* structure = currentInstruction[3].u.objectAllocationProfile->structure();
size_t allocationSize = JSFinalObject::allocationSize(structure->inlineCapacity());
MarkedAllocator* allocator = &m_vm->heap.allocatorForObjectWithoutDestructor(allocationSize);
RegisterID resultReg = returnValueGPR;
RegisterID allocatorReg = regT1;
RegisterID scratchReg = regT3;
move(TrustedImmPtr(allocator), allocatorReg);
emitAllocateJSObject(allocatorReg, TrustedImmPtr(structure), resultReg, scratchReg);
emitStoreCell(currentInstruction[1].u.operand, resultReg);
}
void JIT::emitSlow_op_new_object(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
int dst = currentInstruction[1].u.operand;
Structure* structure = currentInstruction[3].u.objectAllocationProfile->structure();
callOperation(operationNewObject, structure);
emitStoreCell(dst, returnValueGPR);
}
void JIT::emit_op_check_has_instance(Instruction* currentInstruction)
{
int baseVal = currentInstruction[3].u.operand;
emitLoadPayload(baseVal, regT0);
// Check that baseVal is a cell.
emitJumpSlowCaseIfNotJSCell(baseVal);
// Check that baseVal 'ImplementsHasInstance'.
addSlowCase(branchTest8(Zero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(ImplementsDefaultHasInstance)));
}
void JIT::emit_op_instanceof(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
int proto = currentInstruction[3].u.operand;
// Load the operands into registers.
// We use regT0 for baseVal since we will be done with this first, and we can then use it for the result.
emitLoadPayload(value, regT2);
emitLoadPayload(proto, regT1);
// Check that proto are cells. baseVal must be a cell - this is checked by op_check_has_instance.
emitJumpSlowCaseIfNotJSCell(value);
emitJumpSlowCaseIfNotJSCell(proto);
// Check that prototype is an object
addSlowCase(emitJumpIfCellNotObject(regT1));
// Optimistically load the result true, and start looping.
// Initially, regT1 still contains proto and regT2 still contains value.
// As we loop regT2 will be updated with its prototype, recursively walking the prototype chain.
move(TrustedImm32(1), regT0);
Label loop(this);
// Load the prototype of the cell in regT2. If this is equal to regT1 - WIN!
// Otherwise, check if we've hit null - if we have then drop out of the loop, if not go again.
loadPtr(Address(regT2, JSCell::structureIDOffset()), regT2);
load32(Address(regT2, Structure::prototypeOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT2);
Jump isInstance = branchPtr(Equal, regT2, regT1);
branchTest32(NonZero, regT2).linkTo(loop, this);
// We get here either by dropping out of the loop, or if value was not an Object. Result is false.
move(TrustedImm32(0), regT0);
// isInstance jumps right down to here, to skip setting the result to false (it has already set true).
isInstance.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emitSlow_op_check_has_instance(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
int baseVal = currentInstruction[3].u.operand;
linkSlowCaseIfNotJSCell(iter, baseVal);
linkSlowCase(iter);
emitLoad(value, regT1, regT0);
emitLoad(baseVal, regT3, regT2);
callOperation(operationCheckHasInstance, dst, regT1, regT0, regT3, regT2);
emitJumpSlowToHot(jump(), currentInstruction[4].u.operand);
}
void JIT::emitSlow_op_instanceof(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
int proto = currentInstruction[3].u.operand;
linkSlowCaseIfNotJSCell(iter, value);
linkSlowCaseIfNotJSCell(iter, proto);
linkSlowCase(iter);
emitLoad(value, regT1, regT0);
emitLoad(proto, regT3, regT2);
callOperation(operationInstanceOf, dst, regT1, regT0, regT3, regT2);
}
void JIT::emit_op_is_undefined(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitLoad(value, regT1, regT0);
Jump isCell = branch32(Equal, regT1, TrustedImm32(JSValue::CellTag));
compare32(Equal, regT1, TrustedImm32(JSValue::UndefinedTag), regT0);
Jump done = jump();
isCell.link(this);
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(0), regT0);
Jump notMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT1);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
loadPtr(Address(regT1, Structure::globalObjectOffset()), regT1);
compare32(Equal, regT0, regT1, regT0);
notMasqueradesAsUndefined.link(this);
done.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_is_boolean(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitLoadTag(value, regT0);
compare32(Equal, regT0, TrustedImm32(JSValue::BooleanTag), regT0);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_is_number(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitLoadTag(value, regT0);
add32(TrustedImm32(1), regT0);
compare32(Below, regT0, TrustedImm32(JSValue::LowestTag + 1), regT0);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_is_string(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitLoad(value, regT1, regT0);
Jump isNotCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
compare8(Equal, Address(regT0, JSCell::typeInfoTypeOffset()), TrustedImm32(StringType), regT0);
Jump done = jump();
isNotCell.link(this);
move(TrustedImm32(0), regT0);
done.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_is_object(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitLoad(value, regT1, regT0);
Jump isNotCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
compare8(AboveOrEqual, Address(regT0, JSCell::typeInfoTypeOffset()), TrustedImm32(ObjectType), regT0);
Jump done = jump();
isNotCell.link(this);
move(TrustedImm32(0), regT0);
done.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_to_primitive(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImm = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
addSlowCase(emitJumpIfCellObject(regT0));
isImm.link(this);
if (dst != src)
emitStore(dst, regT1, regT0);
}
void JIT::emitSlow_op_to_primitive(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_primitive);
slowPathCall.call();
}
void JIT::emit_op_strcat(Instruction* currentInstruction)
{
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_strcat);
slowPathCall.call();
}
void JIT::emit_op_not(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoadTag(src, regT0);
emitLoad(src, regT1, regT0);
addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::BooleanTag)));
xor32(TrustedImm32(1), regT0);
emitStoreBool(dst, regT0, (dst == src));
}
void JIT::emitSlow_op_not(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_not);
slowPathCall.call();
}
void JIT::emit_op_jfalse(Instruction* currentInstruction)
{
int cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(cond, regT1, regT0);
ASSERT((JSValue::BooleanTag + 1 == JSValue::Int32Tag) && !(JSValue::Int32Tag + 1));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::BooleanTag)));
addJump(branchTest32(Zero, regT0), target);
}
void JIT::emitSlow_op_jfalse(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
linkSlowCase(iter);
if (supportsFloatingPoint()) {
// regT1 contains the tag from the hot path.
Jump notNumber = branch32(Above, regT1, TrustedImm32(JSValue::LowestTag));
emitLoadDouble(cond, fpRegT0);
emitJumpSlowToHot(branchDoubleZeroOrNaN(fpRegT0, fpRegT1), target);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_jfalse));
notNumber.link(this);
}
callOperation(operationConvertJSValueToBoolean, regT1, regT0);
emitJumpSlowToHot(branchTest32(Zero, returnValueGPR), target); // Inverted.
}
void JIT::emit_op_jtrue(Instruction* currentInstruction)
{
int cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(cond, regT1, regT0);
ASSERT((JSValue::BooleanTag + 1 == JSValue::Int32Tag) && !(JSValue::Int32Tag + 1));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::BooleanTag)));
addJump(branchTest32(NonZero, regT0), target);
}
void JIT::emitSlow_op_jtrue(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
linkSlowCase(iter);
if (supportsFloatingPoint()) {
// regT1 contains the tag from the hot path.
Jump notNumber = branch32(Above, regT1, TrustedImm32(JSValue::LowestTag));
emitLoadDouble(cond, fpRegT0);
emitJumpSlowToHot(branchDoubleNonZero(fpRegT0, fpRegT1), target);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_jtrue));
notNumber.link(this);
}
callOperation(operationConvertJSValueToBoolean, regT1, regT0);
emitJumpSlowToHot(branchTest32(NonZero, returnValueGPR), target);
}
void JIT::emit_op_jeq_null(Instruction* currentInstruction)
{
int src = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImmediate = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
Jump isNotMasqueradesAsUndefined = branchTest8(Zero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT2);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
addJump(branchPtr(Equal, Address(regT2, Structure::globalObjectOffset()), regT0), target);
Jump masqueradesGlobalObjectIsForeign = jump();
// Now handle the immediate cases - undefined & null
isImmediate.link(this);
ASSERT((JSValue::UndefinedTag + 1 == JSValue::NullTag) && (JSValue::NullTag & 0x1));
or32(TrustedImm32(1), regT1);
addJump(branch32(Equal, regT1, TrustedImm32(JSValue::NullTag)), target);
isNotMasqueradesAsUndefined.link(this);
masqueradesGlobalObjectIsForeign.link(this);
}
void JIT::emit_op_jneq_null(Instruction* currentInstruction)
{
int src = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImmediate = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
addJump(branchTest8(Zero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT2);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
addJump(branchPtr(NotEqual, Address(regT2, Structure::globalObjectOffset()), regT0), target);
Jump wasNotImmediate = jump();
// Now handle the immediate cases - undefined & null
isImmediate.link(this);
ASSERT((JSValue::UndefinedTag + 1 == JSValue::NullTag) && (JSValue::NullTag & 0x1));
or32(TrustedImm32(1), regT1);
addJump(branch32(NotEqual, regT1, TrustedImm32(JSValue::NullTag)), target);
wasNotImmediate.link(this);
}
void JIT::emit_op_jneq_ptr(Instruction* currentInstruction)
{
int src = currentInstruction[1].u.operand;
Special::Pointer ptr = currentInstruction[2].u.specialPointer;
unsigned target = currentInstruction[3].u.operand;
emitLoad(src, regT1, regT0);
addJump(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)), target);
addJump(branchPtr(NotEqual, regT0, TrustedImmPtr(actualPointerFor(m_codeBlock, ptr))), target);
}
void JIT::emit_op_eq(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src1 = currentInstruction[2].u.operand;
int src2 = currentInstruction[3].u.operand;
emitLoad2(src1, regT1, regT0, src2, regT3, regT2);
addSlowCase(branch32(NotEqual, regT1, regT3));
addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::CellTag)));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::LowestTag)));
compare32(Equal, regT0, regT2, regT0);
emitStoreBool(dst, regT0);
}
void JIT::emitSlow_op_eq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int op1 = currentInstruction[2].u.operand;
int op2 = currentInstruction[3].u.operand;
JumpList storeResult;
JumpList genericCase;
genericCase.append(getSlowCase(iter)); // tags not equal
linkSlowCase(iter); // tags equal and JSCell
genericCase.append(branchPtr(NotEqual, Address(regT0, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
genericCase.append(branchPtr(NotEqual, Address(regT2, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
// String case.
callOperation(operationCompareStringEq, regT0, regT2);
storeResult.append(jump());
// Generic case.
genericCase.append(getSlowCase(iter)); // doubles
genericCase.link(this);
emitLoad(op1, regT1, regT0);
emitLoad(op2, regT3, regT2);
callOperation(operationCompareEq, regT1, regT0, regT3, regT2);
storeResult.link(this);
emitStoreBool(dst, returnValueGPR);
}
void JIT::emit_op_neq(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src1 = currentInstruction[2].u.operand;
int src2 = currentInstruction[3].u.operand;
emitLoad2(src1, regT1, regT0, src2, regT3, regT2);
addSlowCase(branch32(NotEqual, regT1, regT3));
addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::CellTag)));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::LowestTag)));
compare32(NotEqual, regT0, regT2, regT0);
emitStoreBool(dst, regT0);
}
void JIT::emitSlow_op_neq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
JumpList storeResult;
JumpList genericCase;
genericCase.append(getSlowCase(iter)); // tags not equal
linkSlowCase(iter); // tags equal and JSCell
genericCase.append(branchPtr(NotEqual, Address(regT0, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
genericCase.append(branchPtr(NotEqual, Address(regT2, JSCell::structureIDOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
// String case.
callOperation(operationCompareStringEq, regT0, regT2);
storeResult.append(jump());
// Generic case.
genericCase.append(getSlowCase(iter)); // doubles
genericCase.link(this);
callOperation(operationCompareEq, regT1, regT0, regT3, regT2);
storeResult.link(this);
xor32(TrustedImm32(0x1), returnValueGPR);
emitStoreBool(dst, returnValueGPR);
}
void JIT::compileOpStrictEq(Instruction* currentInstruction, CompileOpStrictEqType type)
{
int dst = currentInstruction[1].u.operand;
int src1 = currentInstruction[2].u.operand;
int src2 = currentInstruction[3].u.operand;
emitLoad2(src1, regT1, regT0, src2, regT3, regT2);
// Bail if the tags differ, or are double.
addSlowCase(branch32(NotEqual, regT1, regT3));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::LowestTag)));
// Jump to a slow case if both are strings or symbols (non object).
Jump notCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
Jump firstIsObject = emitJumpIfCellObject(regT0);
addSlowCase(emitJumpIfCellNotObject(regT2));
notCell.link(this);
firstIsObject.link(this);
// Simply compare the payloads.
if (type == OpStrictEq)
compare32(Equal, regT0, regT2, regT0);
else
compare32(NotEqual, regT0, regT2, regT0);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_stricteq(Instruction* currentInstruction)
{
compileOpStrictEq(currentInstruction, OpStrictEq);
}
void JIT::emitSlow_op_stricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
linkSlowCase(iter);
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_stricteq);
slowPathCall.call();
}
void JIT::emit_op_nstricteq(Instruction* currentInstruction)
{
compileOpStrictEq(currentInstruction, OpNStrictEq);
}
void JIT::emitSlow_op_nstricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
linkSlowCase(iter);
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_nstricteq);
slowPathCall.call();
}
void JIT::emit_op_eq_null(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImmediate = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(0), regT1);
Jump wasNotMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT2);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
loadPtr(Address(regT2, Structure::globalObjectOffset()), regT2);
compare32(Equal, regT0, regT2, regT1);
Jump wasNotImmediate = jump();
isImmediate.link(this);
compare32(Equal, regT1, TrustedImm32(JSValue::NullTag), regT2);
compare32(Equal, regT1, TrustedImm32(JSValue::UndefinedTag), regT1);
or32(regT2, regT1);
wasNotImmediate.link(this);
wasNotMasqueradesAsUndefined.link(this);
emitStoreBool(dst, regT1);
}
void JIT::emit_op_neq_null(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImmediate = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(1), regT1);
Jump wasNotMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
loadPtr(Address(regT0, JSCell::structureIDOffset()), regT2);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
loadPtr(Address(regT2, Structure::globalObjectOffset()), regT2);
compare32(NotEqual, regT0, regT2, regT1);
Jump wasNotImmediate = jump();
isImmediate.link(this);
compare32(NotEqual, regT1, TrustedImm32(JSValue::NullTag), regT2);
compare32(NotEqual, regT1, TrustedImm32(JSValue::UndefinedTag), regT1);
and32(regT2, regT1);
wasNotImmediate.link(this);
wasNotMasqueradesAsUndefined.link(this);
emitStoreBool(dst, regT1);
}
void JIT::emit_op_throw(Instruction* currentInstruction)
{
ASSERT(regT0 == returnValueGPR);
copyCalleeSavesToVMCalleeSavesBuffer();
emitLoad(currentInstruction[1].u.operand, regT1, regT0);
callOperationNoExceptionCheck(operationThrow, regT1, regT0);
jumpToExceptionHandler();
}
void JIT::emit_op_push_with_scope(Instruction* currentInstruction)
{
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_push_with_scope);
slowPathCall.call();
}
void JIT::emit_op_to_number(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isInt32 = branch32(Equal, regT1, TrustedImm32(JSValue::Int32Tag));
addSlowCase(branch32(AboveOrEqual, regT1, TrustedImm32(JSValue::LowestTag)));
isInt32.link(this);
if (src != dst)
emitStore(dst, regT1, regT0);
}
void JIT::emitSlow_op_to_number(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_number);
slowPathCall.call();
}
void JIT::emit_op_to_string(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
addSlowCase(branch8(NotEqual, Address(regT0, JSCell::typeInfoTypeOffset()), TrustedImm32(StringType)));
if (src != dst)
emitStore(dst, regT1, regT0);
}
void JIT::emitSlow_op_to_string(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter); // Not JSCell.
linkSlowCase(iter); // Not JSString.
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_string);
slowPathCall.call();
}
void JIT::emit_op_catch(Instruction* currentInstruction)
{
restoreCalleeSavesFromVMCalleeSavesBuffer();
move(TrustedImmPtr(m_vm), regT3);
// operationThrow returns the callFrame for the handler.
load32(Address(regT3, VM::callFrameForCatchOffset()), callFrameRegister);
storePtr(TrustedImmPtr(nullptr), Address(regT3, VM::callFrameForCatchOffset()));
addPtr(TrustedImm32(stackPointerOffsetFor(codeBlock()) * sizeof(Register)), callFrameRegister, stackPointerRegister);
callOperationNoExceptionCheck(operationCheckIfExceptionIsUncatchableAndNotifyProfiler);
Jump isCatchableException = branchTest32(Zero, returnValueGPR);
jumpToExceptionHandler();
isCatchableException.link(this);
move(TrustedImmPtr(m_vm), regT3);
// Now store the exception returned by operationThrow.
load32(Address(regT3, VM::exceptionOffset()), regT2);
move(TrustedImm32(JSValue::CellTag), regT1);
store32(TrustedImm32(0), Address(regT3, VM::exceptionOffset()));
unsigned exception = currentInstruction[1].u.operand;
emitStore(exception, regT1, regT2);
load32(Address(regT2, Exception::valueOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0);
load32(Address(regT2, Exception::valueOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1);
unsigned thrownValue = currentInstruction[2].u.operand;
emitStore(thrownValue, regT1, regT0);
}
void JIT::emit_op_create_lexical_environment(Instruction* currentInstruction)
{
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_create_lexical_environment);
slowPathCall.call();
}
void JIT::emit_op_get_parent_scope(Instruction* currentInstruction)
{
int currentScope = currentInstruction[2].u.operand;
emitLoadPayload(currentScope, regT0);
loadPtr(Address(regT0, JSScope::offsetOfNext()), regT0);
emitStoreCell(currentInstruction[1].u.operand, regT0);
}
void JIT::emit_op_switch_imm(Instruction* currentInstruction)
{
size_t tableIndex = currentInstruction[1].u.operand;
unsigned defaultOffset = currentInstruction[2].u.operand;
unsigned scrutinee = currentInstruction[3].u.operand;
// create jump table for switch destinations, track this switch statement.
SimpleJumpTable* jumpTable = &m_codeBlock->switchJumpTable(tableIndex);
m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset, SwitchRecord::Immediate));
jumpTable->ensureCTITable();
emitLoad(scrutinee, regT1, regT0);
callOperation(operationSwitchImmWithUnknownKeyType, regT1, regT0, tableIndex);
jump(returnValueGPR);
}
void JIT::emit_op_switch_char(Instruction* currentInstruction)
{
size_t tableIndex = currentInstruction[1].u.operand;
unsigned defaultOffset = currentInstruction[2].u.operand;
unsigned scrutinee = currentInstruction[3].u.operand;
// create jump table for switch destinations, track this switch statement.
SimpleJumpTable* jumpTable = &m_codeBlock->switchJumpTable(tableIndex);
m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset, SwitchRecord::Character));
jumpTable->ensureCTITable();
emitLoad(scrutinee, regT1, regT0);
callOperation(operationSwitchCharWithUnknownKeyType, regT1, regT0, tableIndex);
jump(returnValueGPR);
}
void JIT::emit_op_switch_string(Instruction* currentInstruction)
{
size_t tableIndex = currentInstruction[1].u.operand;
unsigned defaultOffset = currentInstruction[2].u.operand;
unsigned scrutinee = currentInstruction[3].u.operand;
// create jump table for switch destinations, track this switch statement.
StringJumpTable* jumpTable = &m_codeBlock->stringSwitchJumpTable(tableIndex);
m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset));
emitLoad(scrutinee, regT1, regT0);
callOperation(operationSwitchStringWithUnknownKeyType, regT1, regT0, tableIndex);
jump(returnValueGPR);
}
void JIT::emit_op_throw_static_error(Instruction* currentInstruction)
{
emitLoad(m_codeBlock->getConstant(currentInstruction[1].u.operand), regT1, regT0);
callOperation(operationThrowStaticError, regT1, regT0, currentInstruction[2].u.operand);
}
void JIT::emit_op_debug(Instruction* currentInstruction)
{
load32(codeBlock()->debuggerRequestsAddress(), regT0);
Jump noDebuggerRequests = branchTest32(Zero, regT0);
callOperation(operationDebug, currentInstruction[1].u.operand);
noDebuggerRequests.link(this);
}
void JIT::emit_op_enter(Instruction* currentInstruction)
{
emitEnterOptimizationCheck();
// Even though JIT code doesn't use them, we initialize our constant
// registers to zap stale pointers, to avoid unnecessarily prolonging
// object lifetime and increasing GC pressure.
for (int i = 0; i < m_codeBlock->m_numVars; ++i)
emitStore(virtualRegisterForLocal(i).offset(), jsUndefined());
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_enter);
slowPathCall.call();
}
void JIT::emit_op_get_scope(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
emitGetFromCallFrameHeaderPtr(JSStack::Callee, regT0);
loadPtr(Address(regT0, JSFunction::offsetOfScopeChain()), regT0);
emitStoreCell(dst, regT0);
}
void JIT::emit_op_load_arrowfunction_this(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
emitGetFromCallFrameHeaderPtr(JSStack::Callee, regT0);
loadPtr(Address(regT0, JSArrowFunction::offsetOfThisValue()), regT0);
emitStoreCell(dst, regT0);
}
void JIT::emit_op_create_this(Instruction* currentInstruction)
{
int callee = currentInstruction[2].u.operand;
WriteBarrierBase<JSCell>* cachedFunction = ¤tInstruction[4].u.jsCell;
RegisterID calleeReg = regT0;
RegisterID rareDataReg = regT4;
RegisterID resultReg = regT0;
RegisterID allocatorReg = regT1;
RegisterID structureReg = regT2;
RegisterID cachedFunctionReg = regT4;
RegisterID scratchReg = regT3;
emitLoadPayload(callee, calleeReg);
loadPtr(Address(calleeReg, JSFunction::offsetOfRareData()), rareDataReg);
addSlowCase(branchTestPtr(Zero, rareDataReg));
loadPtr(Address(rareDataReg, FunctionRareData::offsetOfAllocationProfile() + ObjectAllocationProfile::offsetOfAllocator()), allocatorReg);
loadPtr(Address(rareDataReg, FunctionRareData::offsetOfAllocationProfile() + ObjectAllocationProfile::offsetOfStructure()), structureReg);
addSlowCase(branchTestPtr(Zero, allocatorReg));
loadPtr(cachedFunction, cachedFunctionReg);
Jump hasSeenMultipleCallees = branchPtr(Equal, cachedFunctionReg, TrustedImmPtr(JSCell::seenMultipleCalleeObjects()));
addSlowCase(branchPtr(NotEqual, calleeReg, cachedFunctionReg));
hasSeenMultipleCallees.link(this);
emitAllocateJSObject(allocatorReg, structureReg, resultReg, scratchReg);
emitStoreCell(currentInstruction[1].u.operand, resultReg);
}
void JIT::emitSlow_op_create_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter); // doesn't have rare data
linkSlowCase(iter); // doesn't have an allocation profile
linkSlowCase(iter); // allocation failed
linkSlowCase(iter); // cached function didn't match
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_create_this);
slowPathCall.call();
}
void JIT::emit_op_to_this(Instruction* currentInstruction)
{
WriteBarrierBase<Structure>* cachedStructure = ¤tInstruction[2].u.structure;
int thisRegister = currentInstruction[1].u.operand;
emitLoad(thisRegister, regT3, regT2);
addSlowCase(branch32(NotEqual, regT3, TrustedImm32(JSValue::CellTag)));
addSlowCase(branch8(NotEqual, Address(regT2, JSCell::typeInfoTypeOffset()), TrustedImm32(FinalObjectType)));
loadPtr(Address(regT2, JSCell::structureIDOffset()), regT0);
loadPtr(cachedStructure, regT2);
addSlowCase(branchPtr(NotEqual, regT0, regT2));
}
void JIT::emitSlow_op_to_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
linkSlowCase(iter);
linkSlowCase(iter);