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JITOpcodes32_64.cpp
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1202 lines (949 loc) · 43.5 KB
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/*
* Copyright (C) 2009, 2012, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2010 Patrick Gansterer <[email protected]>
*
* 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 "JITInlines.h"
#include "JSArray.h"
#include "JSCell.h"
#include "JSFunction.h"
#include "JSPropertyNameIterator.h"
#include "JSVariableObject.h"
#include "LinkBuffer.h"
#include "SlowPathCall.h"
#include "VirtualRegister.h"
namespace JSC {
JIT::CodeRef JIT::privateCompileCTINativeCall(VM* vm, NativeFunction func)
{
Call nativeCall;
emitPutImmediateToCallFrameHeader(0, JSStack::CodeBlock);
storePtr(callFrameRegister, &m_vm->topCallFrame);
#if CPU(X86)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetCallerFrameFromCallFrameHeaderPtr(regT0);
emitGetFromCallFrameHeaderPtr(JSStack::ScopeChain, regT1, regT0);
emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
peek(regT1);
emitPutReturnPCToCallFrameHeader(regT1);
// Calling convention: f(ecx, edx, ...);
// Host function signature: f(ExecState*);
move(callFrameRegister, X86Registers::ecx);
subPtr(TrustedImm32(16 - sizeof(void*)), stackPointerRegister); // Align stack after call.
move(regT0, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
// call the function
nativeCall = call();
addPtr(TrustedImm32(16 - sizeof(void*)), stackPointerRegister);
#elif CPU(ARM) || CPU(SH4) || CPU(MIPS)
// Load caller frame's scope chain into this callframe so that whatever we call can get to its global data.
emitGetCallerFrameFromCallFrameHeaderPtr(regT2);
emitGetFromCallFrameHeaderPtr(JSStack::ScopeChain, regT1, regT2);
emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
preserveReturnAddressAfterCall(regT3); // Callee preserved
emitPutReturnPCToCallFrameHeader(regT3);
#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);
move(regT2, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
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."
breakpoint();
#endif // CPU(X86)
// Check for an exception
Jump sawException = branch32(NotEqual, AbsoluteAddress(reinterpret_cast<char*>(vm->addressOfException()) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), TrustedImm32(JSValue::EmptyValueTag));
// Return.
ret();
// Handle an exception
sawException.link(this);
// Grab the return address.
preserveReturnAddressAfterCall(regT1);
move(TrustedImmPtr(&vm->exceptionLocation), regT2);
storePtr(regT1, regT2);
storePtr(callFrameRegister, &m_vm->topCallFrame);
#if CPU(X86)
addPtr(TrustedImm32(-12), stackPointerRegister);
push(callFrameRegister);
#else
move(callFrameRegister, argumentGPR0);
#endif
move(TrustedImmPtr(FunctionPtr(operationVMHandleException).value()), regT3);
call(regT3);
#if CPU(X86)
addPtr(TrustedImm32(16), 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_captured_mov(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
emitNotifyWrite(regT1, regT0, regT2, currentInstruction[3].u.watchpointSet);
emitStore(dst, regT1, regT0);
}
void JIT::emit_op_end(Instruction* currentInstruction)
{
ASSERT(returnValueGPR != callFrameRegister);
emitLoad(currentInstruction[1].u.operand, regT1, regT0);
restoreReturnAddressBeforeReturn(Address(callFrameRegister, CallFrame::returnPCOffset()));
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 = regT0;
RegisterID allocatorReg = regT1;
RegisterID scratchReg = regT2;
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'.
loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
addSlowCase(branchTest8(Zero, Address(regT0, Structure::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
loadPtr(Address(regT1, JSCell::structureOffset()), regT3);
addSlowCase(emitJumpIfNotObject(regT3));
// 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::structureOffset()), 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);
loadPtr(Address(regT0, JSCell::structureOffset()), regT1);
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT1, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(0), regT0);
Jump notMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
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));
loadPtr(Address(regT0, JSCell::structureOffset()), regT1);
compare8(Equal, Address(regT1, Structure::typeInfoTypeOffset()), TrustedImm32(StringType), regT0);
Jump done = jump();
isNotCell.link(this);
move(TrustedImm32(0), regT0);
done.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_tear_off_activation(Instruction* currentInstruction)
{
int activation = currentInstruction[1].u.operand;
Jump activationNotCreated = branch32(Equal, tagFor(activation), TrustedImm32(JSValue::EmptyValueTag));
emitLoadPayload(activation, regT0);
callOperation(operationTearOffActivation, regT0);
activationNotCreated.link(this);
}
void JIT::emit_op_tear_off_arguments(Instruction* currentInstruction)
{
VirtualRegister arguments = VirtualRegister(currentInstruction[1].u.operand);
int activation = currentInstruction[2].u.operand;
Jump argsNotCreated = branch32(Equal, tagFor(unmodifiedArgumentsRegister(arguments).offset()), TrustedImm32(JSValue::EmptyValueTag));
emitLoadPayload(unmodifiedArgumentsRegister(VirtualRegister(arguments)).offset(), regT0);
emitLoadPayload(activation, regT1);
callOperation(operationTearOffArguments, regT0, regT1);
argsNotCreated.link(this);
}
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(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
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));
// First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
Jump isNotMasqueradesAsUndefined = branchTest8(Zero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
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));
// First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
addJump(branchTest8(Zero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
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::structureOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
genericCase.append(branchPtr(NotEqual, Address(regT2, JSCell::structureOffset()), 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::structureOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
genericCase.append(branchPtr(NotEqual, Address(regT2, JSCell::structureOffset()), 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.
Jump notCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
Jump firstNotString = branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(m_vm->stringStructure.get()));
addSlowCase(branchPtr(Equal, Address(regT2, JSCell::structureOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
notCell.link(this);
firstNotString.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));
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(0), regT1);
Jump wasNotMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
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));
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(1), regT1);
Jump wasNotMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
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);
emitLoad(currentInstruction[1].u.operand, regT1, regT0);
callOperationNoExceptionCheck(operationThrow, regT1, regT0);
jumpToExceptionHandler();
}
void JIT::emit_op_get_pnames(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int i = currentInstruction[3].u.operand;
int size = currentInstruction[4].u.operand;
int breakTarget = currentInstruction[5].u.operand;
JumpList isNotObject;
emitLoad(base, regT1, regT0);
if (!m_codeBlock->isKnownNotImmediate(base))
isNotObject.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
if (VirtualRegister(base) != m_codeBlock->thisRegister() || m_codeBlock->isStrictMode()) {
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
isNotObject.append(emitJumpIfNotObject(regT2));
}
// We could inline the case where you have a valid cache, but
// this call doesn't seem to be hot.
Label isObject(this);
callOperation(operationGetPNames, regT0);
emitStoreCell(dst, returnValueGPR);
load32(Address(regT0, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStringsSize)), regT3);
store32(TrustedImm32(Int32Tag), intTagFor(i));
store32(TrustedImm32(0), intPayloadFor(i));
store32(TrustedImm32(Int32Tag), intTagFor(size));
store32(regT3, payloadFor(size));
Jump end = jump();
isNotObject.link(this);
addJump(branch32(Equal, regT1, TrustedImm32(JSValue::NullTag)), breakTarget);
addJump(branch32(Equal, regT1, TrustedImm32(JSValue::UndefinedTag)), breakTarget);
callOperation(operationToObject, base, regT1, regT0);
jump().linkTo(isObject, this);
end.link(this);
}
void JIT::emit_op_next_pname(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
int i = currentInstruction[3].u.operand;
int size = currentInstruction[4].u.operand;
int it = currentInstruction[5].u.operand;
int target = currentInstruction[6].u.operand;
JumpList callHasProperty;
Label begin(this);
load32(intPayloadFor(i), regT0);
Jump end = branch32(Equal, regT0, intPayloadFor(size));
// Grab key @ i
loadPtr(payloadFor(it), regT1);
loadPtr(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStrings)), regT2);
load32(BaseIndex(regT2, regT0, TimesEight), regT2);
store32(TrustedImm32(JSValue::CellTag), tagFor(dst));
store32(regT2, payloadFor(dst));
// Increment i
add32(TrustedImm32(1), regT0);
store32(regT0, intPayloadFor(i));
// Verify that i is valid:
loadPtr(payloadFor(base), regT0);
// Test base's structure
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
callHasProperty.append(branchPtr(NotEqual, regT2, Address(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructure)))));
// Test base's prototype chain
loadPtr(Address(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedPrototypeChain))), regT3);
loadPtr(Address(regT3, OBJECT_OFFSETOF(StructureChain, m_vector)), regT3);
addJump(branchTestPtr(Zero, Address(regT3)), target);
Label checkPrototype(this);
callHasProperty.append(branch32(Equal, Address(regT2, Structure::prototypeOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), TrustedImm32(JSValue::NullTag)));
loadPtr(Address(regT2, Structure::prototypeOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT2);
loadPtr(Address(regT2, JSCell::structureOffset()), regT2);
callHasProperty.append(branchPtr(NotEqual, regT2, Address(regT3)));
addPtr(TrustedImm32(sizeof(Structure*)), regT3);
branchTestPtr(NonZero, Address(regT3)).linkTo(checkPrototype, this);
// Continue loop.
addJump(jump(), target);
// Slow case: Ask the object if i is valid.
callHasProperty.link(this);
loadPtr(addressFor(dst), regT1);
callOperation(operationHasProperty, regT0, regT1);
// Test for valid key.
addJump(branchTest32(NonZero, regT0), target);
jump().linkTo(begin, this);
// End of loop.
end.link(this);
}
void JIT::emit_op_push_with_scope(Instruction* currentInstruction)
{
emitLoad(currentInstruction[1].u.operand, regT1, regT0);
callOperation(operationPushWithScope, regT1, regT0);
}
void JIT::emit_op_pop_scope(Instruction*)
{
callOperation(operationPopScope);
}
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_push_name_scope(Instruction* currentInstruction)
{
emitLoad(currentInstruction[2].u.operand, regT1, regT0);
callOperation(operationPushNameScope, &m_codeBlock->identifier(currentInstruction[1].u.operand), regT1, regT0, currentInstruction[3].u.operand);
}
void JIT::emit_op_catch(Instruction* currentInstruction)
{
move(TrustedImmPtr(m_vm), regT3);
// operationThrow returns the callFrame for the handler.
load32(Address(regT3, VM::callFrameForThrowOffset()), callFrameRegister);
// Now store the exception returned by operationThrow.
load32(Address(regT3, VM::exceptionOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0);
load32(Address(regT3, VM::exceptionOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1);
store32(TrustedImm32(JSValue().payload()), Address(regT3, VM::exceptionOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)));
store32(TrustedImm32(JSValue().tag()), Address(regT3, VM::exceptionOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.tag)));
unsigned exception = currentInstruction[1].u.operand;
emitStore(exception, regT1, 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->ctiOffsets.grow(jumpTable->branchOffsets.size());
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->ctiOffsets.grow(jumpTable->branchOffsets.size());
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)
{
#if ENABLE(DEBUG_WITH_BREAKPOINT)
UNUSED_PARAM(currentInstruction);
breakpoint();
#elif ENABLE(JAVASCRIPT_DEBUGGER)
JSGlobalObject* globalObject = codeBlock()->globalObject();
Debugger* debugger = globalObject->debugger();