/*
* Copyright (C) 2009, 2012, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2010 Patrick Gansterer
*
* 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 "CopiedSpaceInlines.h"
#include "Debugger.h"
#include "Heap.h"
#include "JITInlines.h"
#include "JSArray.h"
#include "JSCell.h"
#include "JSFunction.h"
#include "JSPropertyNameIterator.h"
#include "LinkBuffer.h"
#include "SlowPathCall.h"
#include "VirtualRegister.h"
namespace JSC {
#if USE(JSVALUE64)
JIT::CodeRef JIT::privateCompileCTINativeCall(VM* vm, NativeFunction)
{
return vm->getCTIStub(nativeCallGenerator);
}
void JIT::emit_op_mov(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitGetVirtualRegister(src, regT0);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_captured_mov(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitGetVirtualRegister(src, regT0);
emitNotifyWrite(regT0, regT1, currentInstruction[3].u.watchpointSet);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_end(Instruction* currentInstruction)
{
RELEASE_ASSERT(returnValueGPR != callFrameRegister);
emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueGPR);
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);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emitSlow_op_new_object(Instruction* currentInstruction, Vector::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;
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(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 (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(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(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(TrustedImm64(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);
load64(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(TrustedImm64(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_is_undefined(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitGetVirtualRegister(value, regT0);
Jump isCell = emitJumpIfJSCell(regT0);
compare64(Equal, regT0, TrustedImm32(ValueUndefined), 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);
comparePtr(Equal, regT0, regT1, regT0);
notMasqueradesAsUndefined.link(this);
done.link(this);
emitTagAsBoolImmediate(regT0);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_is_boolean(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitGetVirtualRegister(value, regT0);
xor64(TrustedImm32(static_cast(ValueFalse)), regT0);
test64(Zero, regT0, TrustedImm32(static_cast(~1)), regT0);
emitTagAsBoolImmediate(regT0);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_is_number(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitGetVirtualRegister(value, regT0);
test64(NonZero, regT0, tagTypeNumberRegister, regT0);
emitTagAsBoolImmediate(regT0);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_is_string(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int value = currentInstruction[2].u.operand;
emitGetVirtualRegister(value, regT0);
Jump isNotCell = emitJumpIfNotJSCell(regT0);
loadPtr(Address(regT0, JSCell::structureOffset()), regT1);
compare8(Equal, Address(regT1, Structure::typeInfoTypeOffset()), TrustedImm32(StringType), regT0);
emitTagAsBoolImmediate(regT0);
Jump done = jump();
isNotCell.link(this);
move(TrustedImm32(ValueFalse), regT0);
done.link(this);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_tear_off_activation(Instruction* currentInstruction)
{
int activation = currentInstruction[1].u.operand;
Jump activationNotCreated = branchTest64(Zero, addressFor(activation));
emitGetVirtualRegister(activation, regT0);
callOperation(operationTearOffActivation, regT0);
activationNotCreated.link(this);
}
void JIT::emit_op_tear_off_arguments(Instruction* currentInstruction)
{
int arguments = currentInstruction[1].u.operand;
int activation = currentInstruction[2].u.operand;
Jump argsNotCreated = branchTest64(Zero, Address(callFrameRegister, sizeof(Register) * (unmodifiedArgumentsRegister(VirtualRegister(arguments)).offset())));
emitGetVirtualRegister(unmodifiedArgumentsRegister(VirtualRegister(arguments)).offset(), regT0);
emitGetVirtualRegister(activation, regT1);
callOperation(operationTearOffArguments, regT0, regT1);
argsNotCreated.link(this);
}
void JIT::emit_op_ret(Instruction* currentInstruction)
{
ASSERT(callFrameRegister != regT1);
ASSERT(regT1 != returnValueGPR);
ASSERT(returnValueGPR != callFrameRegister);
// Return the result in %eax.
emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueGPR);
// Grab the return address.
emitGetReturnPCFromCallFrameHeaderPtr(regT1);
// Restore our caller's "r".
emitGetCallerFrameFromCallFrameHeaderPtr(callFrameRegister);
// Return.
restoreReturnAddressBeforeReturn(regT1);
ret();
}
void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
{
ASSERT(callFrameRegister != regT1);
ASSERT(regT1 != returnValueGPR);
ASSERT(returnValueGPR != callFrameRegister);
// Return the result in %eax.
emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueGPR);
Jump notJSCell = emitJumpIfNotJSCell(returnValueGPR);
loadPtr(Address(returnValueGPR, JSCell::structureOffset()), regT2);
Jump notObject = emitJumpIfNotObject(regT2);
// Grab the return address.
emitGetReturnPCFromCallFrameHeaderPtr(regT1);
// Restore our caller's "r".
emitGetCallerFrameFromCallFrameHeaderPtr(callFrameRegister);
// Return.
restoreReturnAddressBeforeReturn(regT1);
ret();
// Return 'this' in %eax.
notJSCell.link(this);
notObject.link(this);
emitGetVirtualRegister(currentInstruction[2].u.operand, returnValueGPR);
// Grab the return address.
emitGetReturnPCFromCallFrameHeaderPtr(regT1);
// Restore our caller's "r".
emitGetCallerFrameFromCallFrameHeaderPtr(callFrameRegister);
// Return.
restoreReturnAddressBeforeReturn(regT1);
ret();
}
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, JSCell::structureOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
isImm.link(this);
if (dst != src)
emitPutVirtualRegister(dst);
}
void JIT::emit_op_strcat(Instruction* currentInstruction)
{
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_strcat);
slowPathCall.call();
}
void JIT::emit_op_not(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
// Invert against JSValue(false); if the value was tagged as a boolean, then all bits will be
// clear other than the low bit (which will be 0 or 1 for false or true inputs respectively).
// Then invert against JSValue(true), which will add the tag back in, and flip the low bit.
xor64(TrustedImm32(static_cast(ValueFalse)), regT0);
addSlowCase(branchTestPtr(NonZero, regT0, TrustedImm32(static_cast(~1))));
xor64(TrustedImm32(static_cast(ValueTrue)), 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(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNumber(0)))), target);
Jump isNonZero = emitJumpIfImmediateInteger(regT0);
addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsBoolean(false)))), target);
addSlowCase(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsBoolean(true)))));
isNonZero.link(this);
}
void JIT::emit_op_jeq_null(Instruction* currentInstruction)
{
int 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);
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);
and64(TrustedImm32(~TagBitUndefined), regT0);
addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNull()))), 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;
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);
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);
and64(TrustedImm32(~TagBitUndefined), regT0);
addJump(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsNull()))), 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;
emitGetVirtualRegister(src, regT0);
addJump(branchPtr(NotEqual, regT0, TrustedImmPtr(actualPointerFor(m_codeBlock, ptr))), target);
}
void JIT::emit_op_eq(Instruction* currentInstruction)
{
emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
compare32(Equal, regT1, regT0, regT0);
emitTagAsBoolImmediate(regT0);
emitPutVirtualRegister(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 = branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNumber(0))));
addJump(emitJumpIfImmediateInteger(regT0), target);
addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsBoolean(true)))), target);
addSlowCase(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsBoolean(false)))));
isZero.link(this);
}
void JIT::emit_op_neq(Instruction* currentInstruction)
{
emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
compare32(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);
xor64(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);
or64(regT1, regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_throw(Instruction* currentInstruction)
{
ASSERT(regT0 == returnValueGPR);
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
callOperationNoExceptionCheck(operationThrow, 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;
emitGetVirtualRegister(base, regT0);
if (!m_codeBlock->isKnownNotImmediate(base))
isNotObject.append(emitJumpIfNotJSCell(regT0));
if (base != m_codeBlock->thisRegister().offset() || 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);
store64(tagTypeNumberRegister, addressFor(i));
store32(TrustedImm32(Int32Tag), intTagFor(size));
store32(regT3, intPayloadFor(size));
Jump end = jump();
isNotObject.link(this);
move(regT0, regT1);
and32(TrustedImm32(~TagBitUndefined), regT1);
addJump(branch32(Equal, regT1, TrustedImm32(ValueNull)), breakTarget);
callOperation(operationToObject, base, 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(addressFor(it), regT1);
loadPtr(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStrings)), regT2);
load64(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);
load64(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);
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)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
callOperation(operationPushWithScope, regT0);
}
void JIT::emit_op_pop_scope(Instruction*)
{
callOperation(operationPopScope);
}
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;
emitGetVirtualRegisters(src1, regT0, src2, regT1);
// Jump slow if both are cells (to cover strings).
move(regT0, regT2);
or64(regT1, regT2);
addSlowCase(emitJumpIfJSCell(regT2));
// Jump slow if either is a double. First test if it's an integer, which is fine, and then test
// if it's a double.
Jump leftOK = emitJumpIfImmediateInteger(regT0);
addSlowCase(emitJumpIfImmediateNumber(regT0));
leftOK.link(this);
Jump rightOK = emitJumpIfImmediateInteger(regT1);
addSlowCase(emitJumpIfImmediateNumber(regT1));
rightOK.link(this);
if (type == OpStrictEq)
compare64(Equal, regT1, regT0, regT0);
else
compare64(NotEqual, regT1, regT0, regT0);
emitTagAsBoolImmediate(regT0);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_stricteq(Instruction* currentInstruction)
{
compileOpStrictEq(currentInstruction, OpStrictEq);
}
void JIT::emit_op_nstricteq(Instruction* currentInstruction)
{
compileOpStrictEq(currentInstruction, OpNStrictEq);
}
void JIT::emit_op_to_number(Instruction* currentInstruction)
{
int srcVReg = currentInstruction[2].u.operand;
emitGetVirtualRegister(srcVReg, regT0);
addSlowCase(emitJumpIfNotImmediateNumber(regT0));
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_push_name_scope(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
callOperation(operationPushNameScope, &m_codeBlock->identifier(currentInstruction[1].u.operand), regT0, currentInstruction[3].u.operand);
}
void JIT::emit_op_catch(Instruction* currentInstruction)
{
move(TrustedImmPtr(m_vm), regT3);
load64(Address(regT3, VM::callFrameForThrowOffset()), callFrameRegister);
load64(Address(regT3, VM::exceptionOffset()), regT0);
store64(TrustedImm64(JSValue::encode(JSValue())), Address(regT3, VM::exceptionOffset()));
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
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());
emitGetVirtualRegister(scrutinee, regT0);
callOperation(operationSwitchImmWithUnknownKeyType, 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());
emitGetVirtualRegister(scrutinee, regT0);
callOperation(operationSwitchCharWithUnknownKeyType, 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));
emitGetVirtualRegister(scrutinee, regT0);
callOperation(operationSwitchStringWithUnknownKeyType, regT0, tableIndex);
jump(returnValueGPR);
}
void JIT::emit_op_throw_static_error(Instruction* currentInstruction)
{
move(TrustedImm64(JSValue::encode(m_codeBlock->getConstant(currentInstruction[1].u.operand))), regT0);
callOperation(operationThrowStaticError, 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();
char* debuggerAddress = reinterpret_cast(globalObject) + JSGlobalObject::debuggerOffset();
Jump noDebugger = branchTestPtr(Zero, AbsoluteAddress(debuggerAddress));
char* flagAddress = reinterpret_cast(debugger) + Debugger::needsOpDebugCallbacksOffset();
Jump skipDebugHook = branchTest8(Zero, AbsoluteAddress(flagAddress));
callOperation(operationDebug, currentInstruction[1].u.operand);
skipDebugHook.link(this);
noDebugger.link(this);
#else
UNUSED_PARAM(currentInstruction);
#endif
}
void JIT::emit_op_eq_null(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src1 = currentInstruction[2].u.operand;
emitGetVirtualRegister(src1, regT0);
Jump isImmediate = emitJumpIfNotJSCell(regT0);
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(0), regT0);
Jump wasNotMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
loadPtr(Address(regT2, Structure::globalObjectOffset()), regT2);
comparePtr(Equal, regT0, regT2, regT0);
Jump wasNotImmediate = jump();
isImmediate.link(this);
and64(TrustedImm32(~TagBitUndefined), regT0);
compare64(Equal, regT0, TrustedImm32(ValueNull), regT0);
wasNotImmediate.link(this);
wasNotMasqueradesAsUndefined.link(this);
emitTagAsBoolImmediate(regT0);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_neq_null(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src1 = currentInstruction[2].u.operand;
emitGetVirtualRegister(src1, regT0);
Jump isImmediate = emitJumpIfNotJSCell(regT0);
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(1), regT0);
Jump wasNotMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
loadPtr(Address(regT2, Structure::globalObjectOffset()), regT2);
comparePtr(NotEqual, regT0, regT2, regT0);
Jump wasNotImmediate = jump();
isImmediate.link(this);
and64(TrustedImm32(~TagBitUndefined), regT0);
compare64(NotEqual, regT0, TrustedImm32(ValueNull), regT0);
wasNotImmediate.link(this);
wasNotMasqueradesAsUndefined.link(this);
emitTagAsBoolImmediate(regT0);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_enter(Instruction* currentInstruction)
{
emitEnterOptimizationCheck();
// Even though CTI doesn't use them, we initialize our constant
// registers to zap stale pointers, to avoid unnecessarily prolonging
// object lifetime and increasing GC pressure.
size_t count = m_codeBlock->m_numVars;
for (size_t j = 0; j * cachedStructure = ¤tInstruction[2].u.structure;
emitGetVirtualRegister(currentInstruction[1].u.operand, regT1);
emitJumpSlowCaseIfNotJSCell(regT1);
loadPtr(Address(regT1, JSCell::structureOffset()), regT0);
addSlowCase(branch8(NotEqual, Address(regT0, Structure::typeInfoTypeOffset()), TrustedImm32(FinalObjectType)));
loadPtr(cachedStructure, regT2);
addSlowCase(branchPtr(NotEqual, regT0, regT2));
}
void JIT::emit_op_get_callee(Instruction* currentInstruction)
{
int result = currentInstruction[1].u.operand;
WriteBarrierBase* cachedFunction = ¤tInstruction[2].u.jsCell;
emitGetFromCallFrameHeaderPtr(JSStack::Callee, regT0);
loadPtr(cachedFunction, regT2);
addSlowCase(branchPtr(NotEqual, regT0, regT2));
emitPutVirtualRegister(result);
}
void JIT::emitSlow_op_get_callee(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_get_callee);
slowPathCall.call();
}
void JIT::emit_op_create_this(Instruction* currentInstruction)
{
int callee = currentInstruction[2].u.operand;
RegisterID calleeReg = regT0;
RegisterID resultReg = regT0;
RegisterID allocatorReg = regT1;
RegisterID structureReg = regT2;
RegisterID scratchReg = regT3;
emitGetVirtualRegister(callee, calleeReg);
loadPtr(Address(calleeReg, JSFunction::offsetOfAllocationProfile() + ObjectAllocationProfile::offsetOfAllocator()), allocatorReg);
loadPtr(Address(calleeReg, JSFunction::offsetOfAllocationProfile() + ObjectAllocationProfile::offsetOfStructure()), structureReg);
addSlowCase(branchTestPtr(Zero, allocatorReg));
emitAllocateJSObject(allocatorReg, structureReg, resultReg, scratchReg);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emitSlow_op_create_this(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter); // doesn't have an allocation profile
linkSlowCase(iter); // allocation failed
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_create_this);
slowPathCall.call();
}
void JIT::emit_op_profile_will_call(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
callOperation(operationProfileWillCall, regT0);
}
void JIT::emit_op_profile_did_call(Instruction* currentInstruction)
{
emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
callOperation(operationProfileDidCall, regT0);
}
// Slow cases
void JIT::emitSlow_op_to_this(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
linkSlowCase(iter);
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_this);
slowPathCall.call();
}
void JIT::emitSlow_op_to_primitive(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_primitive);
slowPathCall.call();
}
void JIT::emitSlow_op_not(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_not);
slowPathCall.call();
}
void JIT::emitSlow_op_jfalse(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
callOperation(operationConvertJSValueToBoolean, regT0);
emitJumpSlowToHot(branchTest32(Zero, returnValueGPR), currentInstruction[2].u.operand); // inverted!
}
void JIT::emitSlow_op_jtrue(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
callOperation(operationConvertJSValueToBoolean, regT0);
emitJumpSlowToHot(branchTest32(NonZero, returnValueGPR), currentInstruction[2].u.operand);
}
void JIT::emitSlow_op_bitxor(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_bitxor);
slowPathCall.call();
}
void JIT::emitSlow_op_bitor(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_bitor);
slowPathCall.call();
}
void JIT::emitSlow_op_eq(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
callOperation(operationCompareEq, regT0, regT1);
emitTagAsBoolImmediate(returnValueGPR);
emitPutVirtualRegister(currentInstruction[1].u.operand, returnValueGPR);
}
void JIT::emitSlow_op_neq(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
callOperation(operationCompareEq, regT0, regT1);
xor32(TrustedImm32(0x1), regT0);
emitTagAsBoolImmediate(returnValueGPR);
emitPutVirtualRegister(currentInstruction[1].u.operand, returnValueGPR);
}
void JIT::emitSlow_op_stricteq(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
linkSlowCase(iter);
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_stricteq);
slowPathCall.call();
}
void JIT::emitSlow_op_nstricteq(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
linkSlowCase(iter);
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_nstricteq);
slowPathCall.call();
}
void JIT::emitSlow_op_check_has_instance(Instruction* currentInstruction, Vector::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);
emitGetVirtualRegister(value, regT0);
emitGetVirtualRegister(baseVal, regT1);
callOperation(operationCheckHasInstance, dst, regT0, regT1);
emitJumpSlowToHot(jump(), currentInstruction[4].u.operand);
}
void JIT::emitSlow_op_instanceof(Instruction* currentInstruction, Vector::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);
emitGetVirtualRegister(value, regT0);
emitGetVirtualRegister(proto, regT1);
callOperation(operationInstanceOf, dst, regT0, regT1);
}
void JIT::emitSlow_op_to_number(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_number);
slowPathCall.call();
}
void JIT::emit_op_get_arguments_length(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int argumentsRegister = currentInstruction[2].u.operand;
addSlowCase(branchTest64(NonZero, addressFor(argumentsRegister)));
emitGetFromCallFrameHeader32(JSStack::ArgumentCount, regT0);
sub32(TrustedImm32(1), regT0);
emitFastArithReTagImmediate(regT0, regT0);
emitPutVirtualRegister(dst, regT0);
}
void JIT::emitSlow_op_get_arguments_length(Instruction* currentInstruction, Vector::iterator& iter)
{
linkSlowCase(iter);
int dst = currentInstruction[1].u.operand;
int base = currentInstruction[2].u.operand;
callOperation(operationGetArgumentsLength, dst, base);
}
void JIT::emit_op_get_argument_by_val(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int argumentsRegister = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
addSlowCase(branchTest64(NonZero, addressFor(argumentsRegister)));
emitGetVirtualRegister(property, regT1);
addSlowCase(emitJumpIfNotImmediateInteger(regT1));
add32(TrustedImm32(1), regT1);
// regT1 now contains the integer index of the argument we want, including this
emitGetFromCallFrameHeader32(JSStack::ArgumentCount, regT2);
addSlowCase(branch32(AboveOrEqual, regT1, regT2));
signExtend32ToPtr(regT1, regT1);
load64(BaseIndex(callFrameRegister, regT1, TimesEight, CallFrame::thisArgumentOffset() * static_cast(sizeof(Register))), regT0);
emitValueProfilingSite(regT4);
emitPutVirtualRegister(dst, regT0);
}
void JIT::emitSlow_op_get_argument_by_val(Instruction* currentInstruction, Vector::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
int arguments = currentInstruction[2].u.operand;
int property = currentInstruction[3].u.operand;
linkSlowCase(iter);
Jump skipArgumentsCreation = jump();
linkSlowCase(iter);
linkSlowCase(iter);
callOperation(operationCreateArguments);
emitStoreCell(arguments, returnValueGPR);
emitStoreCell(unmodifiedArgumentsRegister(VirtualRegister(arguments)), returnValueGPR);
skipArgumentsCreation.link(this);
emitGetVirtualRegister(arguments, regT0);
emitGetVirtualRegister(property, regT1);
callOperation(WithProfile, operationGetByValGeneric, dst, regT0, regT1);
}
#endif // USE(JSVALUE64)
void JIT::emit_op_touch_entry(Instruction* currentInstruction)
{
if (m_codeBlock->symbolTable()->m_functionEnteredOnce.hasBeenInvalidated())
return;
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_touch_entry);
slowPathCall.call();
}
void JIT::emit_op_loop_hint(Instruction*)
{
// Emit the JIT optimization check:
if (canBeOptimized()) {
if (Options::enableOSREntryInLoops()) {
addSlowCase(branchAdd32(PositiveOrZero, TrustedImm32(Options::executionCounterIncrementForLoop()),
AbsoluteAddress(m_codeBlock->addressOfJITExecuteCounter())));
} else {
// Add with saturation.
move(TrustedImmPtr(m_codeBlock->addressOfJITExecuteCounter()), regT3);
load32(regT3, regT2);
Jump dontAdd = branch32(
GreaterThan, regT2,
TrustedImm32(std::numeric_limits::max() - Options::executionCounterIncrementForLoop()));
add32(TrustedImm32(Options::executionCounterIncrementForLoop()), regT2);
store32(regT2, regT3);
dontAdd.link(this);
}
}
// Emit the watchdog timer check:
if (m_vm->watchdog.isEnabled())
addSlowCase(branchTest8(NonZero, AbsoluteAddress(m_vm->watchdog.timerDidFireAddress())));
}
void JIT::emitSlow_op_loop_hint(Instruction*, Vector::iterator& iter)
{
#if ENABLE(DFG_JIT)
// Emit the slow path for the JIT optimization check:
if (canBeOptimized() && Options::enableOSREntryInLoops()) {
linkSlowCase(iter);
callOperation(operationOptimize, m_bytecodeOffset);
Jump noOptimizedEntry = branchTestPtr(Zero, returnValueGPR);
jump(returnValueGPR);
noOptimizedEntry.link(this);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_loop_hint));
}
#endif
// Emit the slow path of the watchdog timer check:
if (m_vm->watchdog.isEnabled()) {
linkSlowCase(iter);
callOperation(operationHandleWatchdogTimer);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_loop_hint));
}
}
void JIT::emit_op_new_regexp(Instruction* currentInstruction)
{
callOperation(operationNewRegexp, currentInstruction[1].u.operand, m_codeBlock->regexp(currentInstruction[2].u.operand));
}
void JIT::emit_op_new_func(Instruction* currentInstruction)
{
Jump lazyJump;
int dst = currentInstruction[1].u.operand;
if (currentInstruction[3].u.operand) {
#if USE(JSVALUE32_64)
lazyJump = branch32(NotEqual, tagFor(dst), TrustedImm32(JSValue::EmptyValueTag));
#else
lazyJump = branchTest64(NonZero, addressFor(dst));
#endif
}
FunctionExecutable* funcExec = m_codeBlock->functionDecl(currentInstruction[2].u.operand);
callOperation(operationNewFunction, dst, funcExec);
if (currentInstruction[3].u.operand)
lazyJump.link(this);
}
void JIT::emit_op_new_captured_func(Instruction* currentInstruction)
{
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_new_captured_func);
slowPathCall.call();
}
void JIT::emit_op_new_func_exp(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
FunctionExecutable* funcExpr = m_codeBlock->functionExpr(currentInstruction[2].u.operand);
callOperation(operationNewFunction, dst, funcExpr);
}
void JIT::emit_op_new_array(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int valuesIndex = currentInstruction[2].u.operand;
int size = currentInstruction[3].u.operand;
addPtr(TrustedImm32(valuesIndex * sizeof(Register)), callFrameRegister, regT0);
callOperation(operationNewArrayWithProfile, dst,
currentInstruction[4].u.arrayAllocationProfile, regT0, size);
}
void JIT::emit_op_new_array_with_size(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int sizeIndex = currentInstruction[2].u.operand;
#if USE(JSVALUE64)
emitGetVirtualRegister(sizeIndex, regT0);
callOperation(operationNewArrayWithSizeAndProfile, dst,
currentInstruction[3].u.arrayAllocationProfile, regT0);
#else
emitLoad(sizeIndex, regT1, regT0);
callOperation(operationNewArrayWithSizeAndProfile, dst,
currentInstruction[3].u.arrayAllocationProfile, regT1, regT0);
#endif
}
void JIT::emit_op_new_array_buffer(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int valuesIndex = currentInstruction[2].u.operand;
int size = currentInstruction[3].u.operand;
const JSValue* values = codeBlock()->constantBuffer(valuesIndex);
callOperation(operationNewArrayBufferWithProfile, dst, currentInstruction[4].u.arrayAllocationProfile, values, size);
}
void JIT::emitSlow_op_captured_mov(Instruction* currentInstruction, Vector::iterator& iter)
{
VariableWatchpointSet* set = currentInstruction[3].u.watchpointSet;
if (!set || set->state() == IsInvalidated)
return;
linkSlowCase(iter);
JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_captured_mov);
slowPathCall.call();
}
} // namespace JSC
#endif // ENABLE(JIT)