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JITOpcodes.cpp
1757 lines (1452 loc) · 67.5 KB
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JITOpcodes.cpp
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/*
* Copyright (C) 2009 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)
#include "JIT.h"
#include "Arguments.h"
#include "JITInlineMethods.h"
#include "JITStubCall.h"
#include "JSArray.h"
#include "JSCell.h"
#include "JSFunction.h"
#include "JSPropertyNameIterator.h"
#include "LinkBuffer.h"
namespace JSC {
#if USE(JSVALUE64)
#define RECORD_JUMP_TARGET(targetOffset) \
do { m_labels[m_bytecodeOffset + (targetOffset)].used(); } while (false)
void JIT::privateCompileCTIMachineTrampolines(RefPtr<ExecutablePool>* executablePool, JSGlobalData* globalData, TrampolineStructure *trampolines)
{
#if ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
// (2) The second function provides fast property access for string length
Label stringLengthBegin = align();
// Check eax is a string
Jump string_failureCases1 = emitJumpIfNotJSCell(regT0);
Jump string_failureCases2 = branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsStringVPtr));
// Checks out okay! - get the length from the Ustring.
load32(Address(regT0, OBJECT_OFFSETOF(JSString, m_length)), regT0);
Jump string_failureCases3 = branch32(Above, regT0, TrustedImm32(JSImmediate::maxImmediateInt));
// regT0 contains a 64 bit value (is positive, is zero extended) so we don't need sign extend here.
emitFastArithIntToImmNoCheck(regT0, regT0);
ret();
#endif
// (3) Trampolines for the slow cases of op_call / op_call_eval / op_construct.
COMPILE_ASSERT(sizeof(CodeType) == 4, CodeTypeEnumMustBe32Bit);
// VirtualCallLink Trampoline
// regT0 holds callee, regT1 holds argCount. regT2 will hold the FunctionExecutable.
JumpList callLinkFailures;
Label virtualCallLinkBegin = align();
compileOpCallInitializeCallFrame();
preserveReturnAddressAfterCall(regT3);
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
restoreArgumentReference();
Call callLazyLinkCall = call();
callLinkFailures.append(branchTestPtr(Zero, regT0));
restoreReturnAddressBeforeReturn(regT3);
emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT1);
jump(regT0);
// VirtualConstructLink Trampoline
// regT0 holds callee, regT1 holds argCount. regT2 will hold the FunctionExecutable.
Label virtualConstructLinkBegin = align();
compileOpCallInitializeCallFrame();
preserveReturnAddressAfterCall(regT3);
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
restoreArgumentReference();
Call callLazyLinkConstruct = call();
callLinkFailures.append(branchTestPtr(Zero, regT0));
restoreReturnAddressBeforeReturn(regT3);
emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT1);
jump(regT0);
// VirtualCall Trampoline
// regT0 holds callee, regT1 holds argCount. regT2 will hold the FunctionExecutable.
Label virtualCallBegin = align();
compileOpCallInitializeCallFrame();
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
Jump hasCodeBlock3 = branch32(GreaterThanOrEqual, Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_numParametersForCall)), TrustedImm32(0));
preserveReturnAddressAfterCall(regT3);
restoreArgumentReference();
Call callCompileCall = call();
callLinkFailures.append(branchTestPtr(Zero, regT0));
emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT1);
restoreReturnAddressBeforeReturn(regT3);
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
hasCodeBlock3.link(this);
loadPtr(Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_jitCodeForCallWithArityCheck)), regT0);
jump(regT0);
// VirtualConstruct Trampoline
// regT0 holds callee, regT1 holds argCount. regT2 will hold the FunctionExecutable.
Label virtualConstructBegin = align();
compileOpCallInitializeCallFrame();
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
Jump hasCodeBlock4 = branch32(GreaterThanOrEqual, Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_numParametersForConstruct)), TrustedImm32(0));
preserveReturnAddressAfterCall(regT3);
restoreArgumentReference();
Call callCompileConstruct = call();
callLinkFailures.append(branchTestPtr(Zero, regT0));
emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT1);
restoreReturnAddressBeforeReturn(regT3);
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
hasCodeBlock4.link(this);
loadPtr(Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_jitCodeForConstructWithArityCheck)), regT0);
jump(regT0);
// If the parser fails we want to be able to be able to keep going,
// So we handle this as a parse failure.
callLinkFailures.link(this);
emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT1);
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn(regT1);
move(TrustedImmPtr(&globalData->exceptionLocation), regT2);
storePtr(regT1, regT2);
poke(callFrameRegister, 1 + OBJECT_OFFSETOF(struct JITStackFrame, callFrame) / sizeof(void*));
poke(TrustedImmPtr(FunctionPtr(ctiVMThrowTrampoline).value()));
ret();
// NativeCall Trampoline
Label nativeCallThunk = privateCompileCTINativeCall(globalData);
Label nativeConstructThunk = privateCompileCTINativeCall(globalData, true);
#if ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
Call string_failureCases1Call = makeTailRecursiveCall(string_failureCases1);
Call string_failureCases2Call = makeTailRecursiveCall(string_failureCases2);
Call string_failureCases3Call = makeTailRecursiveCall(string_failureCases3);
#endif
// All trampolines constructed! copy the code, link up calls, and set the pointers on the Machine object.
LinkBuffer patchBuffer(this, m_globalData->executableAllocator.poolForSize(m_assembler.size()), 0);
#if ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
patchBuffer.link(string_failureCases1Call, FunctionPtr(cti_op_get_by_id_string_fail));
patchBuffer.link(string_failureCases2Call, FunctionPtr(cti_op_get_by_id_string_fail));
patchBuffer.link(string_failureCases3Call, FunctionPtr(cti_op_get_by_id_string_fail));
#endif
#if ENABLE(JIT_OPTIMIZE_CALL)
patchBuffer.link(callLazyLinkCall, FunctionPtr(cti_vm_lazyLinkCall));
patchBuffer.link(callLazyLinkConstruct, FunctionPtr(cti_vm_lazyLinkConstruct));
#endif
patchBuffer.link(callCompileCall, FunctionPtr(cti_op_call_jitCompile));
patchBuffer.link(callCompileConstruct, FunctionPtr(cti_op_construct_jitCompile));
CodeRef finalCode = patchBuffer.finalizeCode();
*executablePool = finalCode.m_executablePool;
trampolines->ctiVirtualCallLink = patchBuffer.trampolineAt(virtualCallLinkBegin);
trampolines->ctiVirtualConstructLink = patchBuffer.trampolineAt(virtualConstructLinkBegin);
trampolines->ctiVirtualCall = patchBuffer.trampolineAt(virtualCallBegin);
trampolines->ctiVirtualConstruct = patchBuffer.trampolineAt(virtualConstructBegin);
trampolines->ctiNativeCall = patchBuffer.trampolineAt(nativeCallThunk);
trampolines->ctiNativeConstruct = patchBuffer.trampolineAt(nativeConstructThunk);
#if ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
trampolines->ctiStringLengthTrampoline = patchBuffer.trampolineAt(stringLengthBegin);
#endif
}
JIT::Label JIT::privateCompileCTINativeCall(JSGlobalData* globalData, bool isConstruct)
{
int executableOffsetToFunction = isConstruct ? OBJECT_OFFSETOF(NativeExecutable, m_constructor) : OBJECT_OFFSETOF(NativeExecutable, m_function);
Label nativeCallThunk = align();
emitPutImmediateToCallFrameHeader(0, RegisterFile::CodeBlock);
#if CPU(X86_64)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT0);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT0);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
peek(regT1);
emitPutToCallFrameHeader(regT1, RegisterFile::ReturnPC);
// Calling convention: f(edi, esi, edx, ecx, ...);
// Host function signature: f(ExecState*);
move(callFrameRegister, X86Registers::edi);
subPtr(TrustedImm32(16 - sizeof(void*)), stackPointerRegister); // Align stack after call.
emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, X86Registers::esi);
loadPtr(Address(X86Registers::esi, OBJECT_OFFSETOF(JSFunction, m_executable)), X86Registers::r9);
move(regT0, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
call(Address(X86Registers::r9, executableOffsetToFunction));
addPtr(TrustedImm32(16 - sizeof(void*)), stackPointerRegister);
#elif CPU(ARM)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT2);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
preserveReturnAddressAfterCall(regT3); // Callee preserved
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
// Calling convention: f(r0 == regT0, r1 == regT1, ...);
// Host function signature: f(ExecState*);
move(callFrameRegister, ARMRegisters::r0);
emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, ARMRegisters::r1);
move(regT2, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
loadPtr(Address(ARMRegisters::r1, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
call(Address(regT2, executableOffsetToFunction));
restoreReturnAddressBeforeReturn(regT3);
#elif CPU(MIPS)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT0);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT0);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
preserveReturnAddressAfterCall(regT3); // Callee preserved
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
// Calling convention: f(a0, a1, a2, a3);
// Host function signature: f(ExecState*);
// Allocate stack space for 16 bytes (8-byte aligned)
// 16 bytes (unused) for 4 arguments
subPtr(TrustedImm32(16), stackPointerRegister);
// Setup arg0
move(callFrameRegister, MIPSRegisters::a0);
// Call
emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, MIPSRegisters::a2);
loadPtr(Address(MIPSRegisters::a2, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
move(regT0, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
call(Address(regT2, executableOffsetToFunction));
// Restore stack space
addPtr(TrustedImm32(16), stackPointerRegister);
restoreReturnAddressBeforeReturn(regT3);
#elif ENABLE(JIT_OPTIMIZE_NATIVE_CALL)
#error "JIT_OPTIMIZE_NATIVE_CALL not yet supported on this platform."
#else
UNUSED_PARAM(executableOffsetToFunction);
breakpoint();
#endif
// Check for an exception
loadPtr(&(globalData->exception), regT2);
Jump exceptionHandler = branchTestPtr(NonZero, regT2);
// Return.
ret();
// Handle an exception
exceptionHandler.link(this);
// Grab the return address.
preserveReturnAddressAfterCall(regT1);
move(TrustedImmPtr(&globalData->exceptionLocation), regT2);
storePtr(regT1, regT2);
poke(callFrameRegister, OBJECT_OFFSETOF(struct JITStackFrame, callFrame) / sizeof(void*));
// Set the return address.
move(TrustedImmPtr(FunctionPtr(ctiVMThrowTrampoline).value()), regT1);
restoreReturnAddressBeforeReturn(regT1);
ret();
return nativeCallThunk;
}
JIT::CodePtr JIT::privateCompileCTINativeCall(PassRefPtr<ExecutablePool>, JSGlobalData* globalData, NativeFunction)
{
return globalData->jitStubs->ctiNativeCall();
}
void JIT::emit_op_mov(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
if (m_codeBlock->isConstantRegisterIndex(src)) {
storePtr(ImmPtr(JSValue::encode(getConstantOperand(src))), Address(callFrameRegister, dst * sizeof(Register)));
if (dst == m_lastResultBytecodeRegister)
killLastResultRegister();
} else if ((src == m_lastResultBytecodeRegister) || (dst == m_lastResultBytecodeRegister)) {
// If either the src or dst is the cached register go though
// get/put registers to make sure we track this correctly.
emitGetVirtualRegister(src, regT0);
emitPutVirtualRegister(dst);
} else {
// Perform the copy via regT1; do not disturb any mapping in regT0.
loadPtr(Address(callFrameRegister, src * sizeof(Register)), regT1);
storePtr(regT1, Address(callFrameRegister, dst * sizeof(Register)));
}
}
void JIT::emit_op_end(Instruction* currentInstruction)
{
ASSERT(returnValueRegister != callFrameRegister);
emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
restoreReturnAddressBeforeReturn(Address(callFrameRegister, RegisterFile::ReturnPC * static_cast<int>(sizeof(Register))));
ret();
}
void JIT::emit_op_jmp(Instruction* currentInstruction)
{
unsigned target = currentInstruction[1].u.operand;
addJump(jump(), target);
RECORD_JUMP_TARGET(target);
}
void JIT::emit_op_loop_if_lesseq(Instruction* currentInstruction)
{
emitTimeoutCheck();
unsigned op1 = currentInstruction[1].u.operand;
unsigned op2 = currentInstruction[2].u.operand;
unsigned target = currentInstruction[3].u.operand;
if (isOperandConstantImmediateInt(op2)) {
emitGetVirtualRegister(op1, regT0);
emitJumpSlowCaseIfNotImmediateInteger(regT0);
int32_t op2imm = getConstantOperandImmediateInt(op2);
addJump(branch32(LessThanOrEqual, regT0, Imm32(op2imm)), target);
} else {
emitGetVirtualRegisters(op1, regT0, op2, regT1);
emitJumpSlowCaseIfNotImmediateInteger(regT0);
emitJumpSlowCaseIfNotImmediateInteger(regT1);
addJump(branch32(LessThanOrEqual, regT0, regT1), target);
}
}
void JIT::emit_op_new_object(Instruction* currentInstruction)
{
JITStubCall(this, cti_op_new_object).call(currentInstruction[1].u.operand);
}
void JIT::emit_op_check_has_instance(Instruction* currentInstruction)
{
unsigned baseVal = currentInstruction[1].u.operand;
emitGetVirtualRegister(baseVal, regT0);
// Check that baseVal is a cell.
emitJumpSlowCaseIfNotJSCell(regT0, baseVal);
// Check that baseVal 'ImplementsHasInstance'.
loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
addSlowCase(branchTest8(Zero, Address(regT0, Structure::typeInfoFlagsOffset()), TrustedImm32(ImplementsHasInstance)));
}
void JIT::emit_op_instanceof(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned value = currentInstruction[2].u.operand;
unsigned baseVal = currentInstruction[3].u.operand;
unsigned proto = currentInstruction[4].u.operand;
// Load the operands (baseVal, proto, and value respectively) into registers.
// We use regT0 for baseVal since we will be done with this first, and we can then use it for the result.
emitGetVirtualRegister(value, regT2);
emitGetVirtualRegister(baseVal, regT0);
emitGetVirtualRegister(proto, regT1);
// Check that proto are cells. baseVal must be a cell - this is checked by op_check_has_instance.
emitJumpSlowCaseIfNotJSCell(regT2, value);
emitJumpSlowCaseIfNotJSCell(regT1, proto);
// Check that prototype is an object
loadPtr(Address(regT1, JSCell::structureOffset()), regT3);
addSlowCase(branch8(NotEqual, Address(regT3, Structure::typeInfoTypeOffset()), TrustedImm32(ObjectType)));
// Fixme: this check is only needed because the JSC API allows HasInstance to be overridden; we should deprecate this.
// Check that baseVal 'ImplementsDefaultHasInstance'.
loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
addSlowCase(branchTest8(Zero, Address(regT0, Structure::typeInfoFlagsOffset()), TrustedImm32(ImplementsDefaultHasInstance)));
// 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(TrustedImmPtr(JSValue::encode(jsBoolean(true))), regT0);
Label loop(this);
// Load the prototype of the object 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);
loadPtr(Address(regT2, Structure::prototypeOffset()), regT2);
Jump isInstance = branchPtr(Equal, regT2, regT1);
emitJumpIfJSCell(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(TrustedImmPtr(JSValue::encode(jsBoolean(false))), regT0);
// isInstance jumps right down to here, to skip setting the result to false (it has already set true).
isInstance.link(this);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_call(Instruction* currentInstruction)
{
compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
}
void JIT::emit_op_call_eval(Instruction* currentInstruction)
{
compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex++);
}
void JIT::emit_op_call_varargs(Instruction* currentInstruction)
{
compileOpCallVarargs(currentInstruction);
}
void JIT::emit_op_construct(Instruction* currentInstruction)
{
compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
}
void JIT::emit_op_get_global_var(Instruction* currentInstruction)
{
JSVariableObject* globalObject = m_codeBlock->globalObject();
loadPtr(&globalObject->m_registers, regT0);
loadPtr(Address(regT0, currentInstruction[2].u.operand * sizeof(Register)), regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_put_global_var(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[2].u.operand, regT1);
JSVariableObject* globalObject = m_codeBlock->globalObject();
loadPtr(&globalObject->m_registers, regT0);
storePtr(regT1, Address(regT0, currentInstruction[1].u.operand * sizeof(Register)));
}
void JIT::emit_op_get_scoped_var(Instruction* currentInstruction)
{
int skip = currentInstruction[3].u.operand;
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT0);
bool checkTopLevel = m_codeBlock->codeType() == FunctionCode && m_codeBlock->needsFullScopeChain();
ASSERT(skip || !checkTopLevel);
if (checkTopLevel && skip--) {
Jump activationNotCreated;
if (checkTopLevel)
activationNotCreated = branchTestPtr(Zero, addressFor(m_codeBlock->activationRegister()));
loadPtr(Address(regT0, OBJECT_OFFSETOF(ScopeChainNode, next)), regT0);
activationNotCreated.link(this);
}
while (skip--)
loadPtr(Address(regT0, OBJECT_OFFSETOF(ScopeChainNode, next)), regT0);
loadPtr(Address(regT0, OBJECT_OFFSETOF(ScopeChainNode, object)), regT0);
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSVariableObject, m_registers)), regT0);
loadPtr(Address(regT0, currentInstruction[2].u.operand * sizeof(Register)), regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_put_scoped_var(Instruction* currentInstruction)
{
int skip = currentInstruction[2].u.operand;
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1);
emitGetVirtualRegister(currentInstruction[3].u.operand, regT0);
bool checkTopLevel = m_codeBlock->codeType() == FunctionCode && m_codeBlock->needsFullScopeChain();
ASSERT(skip || !checkTopLevel);
if (checkTopLevel && skip--) {
Jump activationNotCreated;
if (checkTopLevel)
activationNotCreated = branchTestPtr(Zero, addressFor(m_codeBlock->activationRegister()));
loadPtr(Address(regT1, OBJECT_OFFSETOF(ScopeChainNode, next)), regT1);
activationNotCreated.link(this);
}
while (skip--)
loadPtr(Address(regT1, OBJECT_OFFSETOF(ScopeChainNode, next)), regT1);
loadPtr(Address(regT1, OBJECT_OFFSETOF(ScopeChainNode, object)), regT1);
loadPtr(Address(regT1, OBJECT_OFFSETOF(JSVariableObject, m_registers)), regT1);
storePtr(regT0, Address(regT1, currentInstruction[1].u.operand * sizeof(Register)));
}
void JIT::emit_op_tear_off_activation(Instruction* currentInstruction)
{
unsigned activation = currentInstruction[1].u.operand;
unsigned arguments = currentInstruction[2].u.operand;
Jump activationCreated = branchTestPtr(NonZero, addressFor(activation));
Jump argumentsNotCreated = branchTestPtr(Zero, addressFor(arguments));
activationCreated.link(this);
JITStubCall stubCall(this, cti_op_tear_off_activation);
stubCall.addArgument(activation, regT2);
stubCall.addArgument(unmodifiedArgumentsRegister(arguments), regT2);
stubCall.call();
argumentsNotCreated.link(this);
}
void JIT::emit_op_tear_off_arguments(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
Jump argsNotCreated = branchTestPtr(Zero, Address(callFrameRegister, sizeof(Register) * (unmodifiedArgumentsRegister(dst))));
JITStubCall stubCall(this, cti_op_tear_off_arguments);
stubCall.addArgument(unmodifiedArgumentsRegister(dst), regT2);
stubCall.call();
argsNotCreated.link(this);
}
void JIT::emit_op_ret(Instruction* currentInstruction)
{
ASSERT(callFrameRegister != regT1);
ASSERT(regT1 != returnValueRegister);
ASSERT(returnValueRegister != callFrameRegister);
// Return the result in %eax.
emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
// Grab the return address.
emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT1);
// Restore our caller's "r".
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
// Return.
restoreReturnAddressBeforeReturn(regT1);
ret();
}
void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
{
ASSERT(callFrameRegister != regT1);
ASSERT(regT1 != returnValueRegister);
ASSERT(returnValueRegister != callFrameRegister);
// Return the result in %eax.
emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
Jump notJSCell = emitJumpIfNotJSCell(returnValueRegister);
loadPtr(Address(returnValueRegister, JSCell::structureOffset()), regT2);
Jump notObject = branch8(NotEqual, Address(regT2, Structure::typeInfoTypeOffset()), TrustedImm32(ObjectType));
// Grab the return address.
emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT1);
// Restore our caller's "r".
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
// Return.
restoreReturnAddressBeforeReturn(regT1);
ret();
// Return 'this' in %eax.
notJSCell.link(this);
notObject.link(this);
emitGetVirtualRegister(currentInstruction[2].u.operand, returnValueRegister);
// Grab the return address.
emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT1);
// Restore our caller's "r".
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
// Return.
restoreReturnAddressBeforeReturn(regT1);
ret();
}
void JIT::emit_op_new_array(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_new_array);
stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
stubCall.call(currentInstruction[1].u.operand);
}
void JIT::emit_op_resolve(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_resolve);
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.call(currentInstruction[1].u.operand);
}
void JIT::emit_op_to_primitive(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitGetVirtualRegister(src, regT0);
Jump isImm = emitJumpIfNotJSCell(regT0);
addSlowCase(branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsStringVPtr)));
isImm.link(this);
if (dst != src)
emitPutVirtualRegister(dst);
}
void JIT::emit_op_strcat(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_strcat);
stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
stubCall.call(currentInstruction[1].u.operand);
}
void JIT::emit_op_resolve_base(Instruction* currentInstruction)
{
JITStubCall stubCall(this, currentInstruction[3].u.operand ? cti_op_resolve_base_strict_put : cti_op_resolve_base);
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.call(currentInstruction[1].u.operand);
}
void JIT::emit_op_ensure_property_exists(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_ensure_property_exists);
stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.call(currentInstruction[1].u.operand);
}
void JIT::emit_op_resolve_skip(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_resolve_skip);
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
stubCall.call(currentInstruction[1].u.operand);
}
void JIT::emit_op_resolve_global(Instruction* currentInstruction, bool)
{
// Fast case
void* globalObject = m_codeBlock->globalObject();
unsigned currentIndex = m_globalResolveInfoIndex++;
void* structureAddress = &(m_codeBlock->globalResolveInfo(currentIndex).structure);
void* offsetAddr = &(m_codeBlock->globalResolveInfo(currentIndex).offset);
// Check Structure of global object
move(TrustedImmPtr(globalObject), regT0);
loadPtr(structureAddress, regT1);
addSlowCase(branchPtr(NotEqual, regT1, Address(regT0, JSCell::structureOffset()))); // Structures don't match
// Load cached property
// Assume that the global object always uses external storage.
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSGlobalObject, m_propertyStorage)), regT0);
load32(offsetAddr, regT1);
loadPtr(BaseIndex(regT0, regT1, ScalePtr), regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emitSlow_op_resolve_global(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned dst = currentInstruction[1].u.operand;
Identifier* ident = &m_codeBlock->identifier(currentInstruction[2].u.operand);
unsigned currentIndex = m_globalResolveInfoIndex++;
linkSlowCase(iter);
JITStubCall stubCall(this, cti_op_resolve_global);
stubCall.addArgument(TrustedImmPtr(ident));
stubCall.addArgument(Imm32(currentIndex));
stubCall.addArgument(regT0);
stubCall.call(dst);
}
void JIT::emit_op_not(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
xorPtr(TrustedImm32(static_cast<int32_t>(JSImmediate::FullTagTypeBool)), regT0);
addSlowCase(branchTestPtr(NonZero, regT0, TrustedImm32(static_cast<int32_t>(~JSImmediate::ExtendedPayloadBitBoolValue))));
xorPtr(TrustedImm32(static_cast<int32_t>(JSImmediate::FullTagTypeBool | JSImmediate::ExtendedPayloadBitBoolValue)), regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_jfalse(Instruction* currentInstruction)
{
unsigned target = currentInstruction[2].u.operand;
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
addJump(branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(jsNumber(0)))), target);
Jump isNonZero = emitJumpIfImmediateInteger(regT0);
addJump(branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(jsBoolean(false)))), target);
addSlowCase(branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(jsBoolean(true)))));
isNonZero.link(this);
RECORD_JUMP_TARGET(target);
}
void JIT::emit_op_jeq_null(Instruction* currentInstruction)
{
unsigned src = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitGetVirtualRegister(src, regT0);
Jump isImmediate = emitJumpIfNotJSCell(regT0);
// First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
addJump(branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
Jump wasNotImmediate = jump();
// Now handle the immediate cases - undefined & null
isImmediate.link(this);
andPtr(TrustedImm32(~JSImmediate::ExtendedTagBitUndefined), regT0);
addJump(branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(jsNull()))), target);
wasNotImmediate.link(this);
RECORD_JUMP_TARGET(target);
};
void JIT::emit_op_jneq_null(Instruction* currentInstruction)
{
unsigned src = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitGetVirtualRegister(src, regT0);
Jump isImmediate = emitJumpIfNotJSCell(regT0);
// 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);
Jump wasNotImmediate = jump();
// Now handle the immediate cases - undefined & null
isImmediate.link(this);
andPtr(TrustedImm32(~JSImmediate::ExtendedTagBitUndefined), regT0);
addJump(branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(jsNull()))), target);
wasNotImmediate.link(this);
RECORD_JUMP_TARGET(target);
}
void JIT::emit_op_jneq_ptr(Instruction* currentInstruction)
{
unsigned src = currentInstruction[1].u.operand;
JSCell* ptr = currentInstruction[2].u.jsCell;
unsigned target = currentInstruction[3].u.operand;
emitGetVirtualRegister(src, regT0);
addJump(branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(JSValue(ptr)))), target);
RECORD_JUMP_TARGET(target);
}
void JIT::emit_op_jsr(Instruction* currentInstruction)
{
int retAddrDst = currentInstruction[1].u.operand;
int target = currentInstruction[2].u.operand;
DataLabelPtr storeLocation = storePtrWithPatch(TrustedImmPtr(0), Address(callFrameRegister, sizeof(Register) * retAddrDst));
addJump(jump(), target);
m_jsrSites.append(JSRInfo(storeLocation, label()));
killLastResultRegister();
RECORD_JUMP_TARGET(target);
}
void JIT::emit_op_sret(Instruction* currentInstruction)
{
jump(Address(callFrameRegister, sizeof(Register) * currentInstruction[1].u.operand));
killLastResultRegister();
}
void JIT::emit_op_eq(Instruction* currentInstruction)
{
emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
set32Compare32(Equal, regT1, regT0, regT0);
emitTagAsBoolImmediate(regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_bitnot(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
emitJumpSlowCaseIfNotImmediateInteger(regT0);
not32(regT0);
emitFastArithIntToImmNoCheck(regT0, regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_resolve_with_base(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_resolve_with_base);
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[3].u.operand)));
stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
stubCall.call(currentInstruction[2].u.operand);
}
void JIT::emit_op_new_func_exp(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_new_func_exp);
stubCall.addArgument(TrustedImmPtr(m_codeBlock->functionExpr(currentInstruction[2].u.operand)));
stubCall.call(currentInstruction[1].u.operand);
}
void JIT::emit_op_jtrue(Instruction* currentInstruction)
{
unsigned target = currentInstruction[2].u.operand;
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
Jump isZero = branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(jsNumber(0))));
addJump(emitJumpIfImmediateInteger(regT0), target);
addJump(branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(jsBoolean(true)))), target);
addSlowCase(branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(jsBoolean(false)))));
isZero.link(this);
RECORD_JUMP_TARGET(target);
}
void JIT::emit_op_neq(Instruction* currentInstruction)
{
emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
set32Compare32(NotEqual, regT1, regT0, regT0);
emitTagAsBoolImmediate(regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_bitxor(Instruction* currentInstruction)
{
emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
xorPtr(regT1, regT0);
emitFastArithReTagImmediate(regT0, regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_bitor(Instruction* currentInstruction)
{
emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
orPtr(regT1, regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_throw(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_throw);
stubCall.addArgument(currentInstruction[1].u.operand, regT2);
stubCall.call();
ASSERT(regT0 == returnValueRegister);
#ifndef NDEBUG
// cti_op_throw always changes it's return address,
// this point in the code should never be reached.
breakpoint();
#endif
}
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;
emitGetVirtualRegister(base, regT0);
if (!m_codeBlock->isKnownNotImmediate(base))
isNotObject.append(emitJumpIfNotJSCell(regT0));
if (base != m_codeBlock->thisRegister() || m_codeBlock->isStrictMode()) {
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
isNotObject.append(branch8(NotEqual, Address(regT2, Structure::typeInfoTypeOffset()), TrustedImm32(ObjectType)));
}
// We could inline the case where you have a valid cache, but
// this call doesn't seem to be hot.
Label isObject(this);
JITStubCall getPnamesStubCall(this, cti_op_get_pnames);
getPnamesStubCall.addArgument(regT0);
getPnamesStubCall.call(dst);
load32(Address(regT0, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStringsSize)), regT3);
storePtr(tagTypeNumberRegister, payloadFor(i));
store32(TrustedImm32(Int32Tag), intTagFor(size));
store32(regT3, intPayloadFor(size));
Jump end = jump();
isNotObject.link(this);
move(regT0, regT1);
and32(TrustedImm32(~JSImmediate::ExtendedTagBitUndefined), regT1);
addJump(branch32(Equal, regT1, TrustedImm32(JSImmediate::FullTagTypeNull)), breakTarget);
JITStubCall toObjectStubCall(this, cti_to_object);
toObjectStubCall.addArgument(regT0);
toObjectStubCall.call(base);
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(addressFor(it), regT1);
loadPtr(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStrings)), regT2);
loadPtr(BaseIndex(regT2, regT0, TimesEight), regT2);
emitPutVirtualRegister(dst, regT2);
// Increment i
add32(TrustedImm32(1), regT0);
store32(regT0, intPayloadFor(i));
// Verify that i is valid:
emitGetVirtualRegister(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);
loadPtr(Address(regT2, Structure::prototypeOffset()), regT2);
callHasProperty.append(emitJumpIfNotJSCell(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);
emitGetVirtualRegister(dst, regT1);
JITStubCall stubCall(this, cti_has_property);
stubCall.addArgument(regT0);
stubCall.addArgument(regT1);
stubCall.call();
// Test for valid key.
addJump(branchTest32(NonZero, regT0), target);
jump().linkTo(begin, this);
// End of loop.
end.link(this);
}
void JIT::emit_op_push_scope(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_push_scope);
stubCall.addArgument(currentInstruction[1].u.operand, regT2);
stubCall.call(currentInstruction[1].u.operand);
}
void JIT::emit_op_pop_scope(Instruction*)
{
JITStubCall(this, cti_op_pop_scope).call();
}