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JITOpcodes.cpp
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1794 lines (1470 loc) · 67.4 KB
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/*
* Copyright (C) 2009-2020 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 "BasicBlockLocation.h"
#include "BytecodeGenerator.h"
#include "Exception.h"
#include "JITInlines.h"
#include "JSCast.h"
#include "JSFunction.h"
#include "JSPropertyNameEnumerator.h"
#include "LinkBuffer.h"
#include "SuperSampler.h"
#include "TypeLocation.h"
#include "TypeProfilerLog.h"
#include "VirtualRegister.h"
namespace JSC {
#if USE(JSVALUE64)
void JIT::emit_op_mov(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpMov>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister src = bytecode.m_src;
if (src.isConstant()) {
JSValue value = m_codeBlock->getConstant(src);
if (!value.isNumber())
store64(TrustedImm64(JSValue::encode(value)), addressFor(dst));
else
store64(Imm64(JSValue::encode(value)), addressFor(dst));
return;
}
load64(addressFor(src), regT0);
store64(regT0, addressFor(dst));
}
void JIT::emit_op_end(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpEnd>();
RELEASE_ASSERT(returnValueGPR != callFrameRegister);
emitGetVirtualRegister(bytecode.m_value, returnValueGPR);
emitRestoreCalleeSaves();
emitFunctionEpilogue();
ret();
}
void JIT::emit_op_jmp(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpJmp>();
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
addJump(jump(), target);
}
void JIT::emit_op_new_object(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpNewObject>();
auto& metadata = bytecode.metadata(m_codeBlock);
Structure* structure = metadata.m_objectAllocationProfile.structure();
size_t allocationSize = JSFinalObject::allocationSize(structure->inlineCapacity());
Allocator allocator = allocatorForNonVirtualConcurrently<JSFinalObject>(*m_vm, allocationSize, AllocatorForMode::AllocatorIfExists);
RegisterID resultReg = regT0;
RegisterID allocatorReg = regT1;
RegisterID scratchReg = regT2;
if (!allocator)
addSlowCase(jump());
else {
JumpList slowCases;
auto butterfly = TrustedImmPtr(nullptr);
emitAllocateJSObject(resultReg, JITAllocator::constant(allocator), allocatorReg, TrustedImmPtr(structure), butterfly, scratchReg, slowCases);
emitInitializeInlineStorage(resultReg, structure->inlineCapacity());
addSlowCase(slowCases);
emitPutVirtualRegister(bytecode.m_dst);
}
}
void JIT::emitSlow_op_new_object(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkAllSlowCases(iter);
auto bytecode = currentInstruction->as<OpNewObject>();
auto& metadata = bytecode.metadata(m_codeBlock);
VirtualRegister dst = bytecode.m_dst;
Structure* structure = metadata.m_objectAllocationProfile.structure();
callOperation(operationNewObject, TrustedImmPtr(&vm()), structure);
emitStoreCell(dst, returnValueGPR);
}
void JIT::emit_op_overrides_has_instance(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpOverridesHasInstance>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister constructor = bytecode.m_constructor;
VirtualRegister hasInstanceValue = bytecode.m_hasInstanceValue;
emitGetVirtualRegister(hasInstanceValue, regT0);
// We don't jump if we know what Symbol.hasInstance would do.
Jump customhasInstanceValue = branchPtr(NotEqual, regT0, TrustedImmPtr(m_codeBlock->globalObject()->functionProtoHasInstanceSymbolFunction()));
emitGetVirtualRegister(constructor, regT0);
// Check that constructor 'ImplementsDefaultHasInstance' i.e. the object is not a C-API user nor a bound function.
test8(Zero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(ImplementsDefaultHasInstance), regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
Jump done = jump();
customhasInstanceValue.link(this);
move(TrustedImm32(JSValue::ValueTrue), regT0);
done.link(this);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_instanceof(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpInstanceof>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister value = bytecode.m_value;
VirtualRegister proto = bytecode.m_prototype;
// 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 the get_by_id for Symbol.hasInstance.
emitJumpSlowCaseIfNotJSCell(regT2, value);
emitJumpSlowCaseIfNotJSCell(regT1, proto);
JITInstanceOfGenerator gen(
m_codeBlock, CodeOrigin(m_bytecodeIndex), CallSiteIndex(m_bytecodeIndex),
RegisterSet::stubUnavailableRegisters(),
regT0, // result
regT2, // value
regT1, // proto
regT3, regT4); // scratch
gen.generateFastPath(*this);
m_instanceOfs.append(gen);
emitPutVirtualRegister(dst);
}
void JIT::emitSlow_op_instanceof(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkAllSlowCases(iter);
auto bytecode = currentInstruction->as<OpInstanceof>();
VirtualRegister resultVReg = bytecode.m_dst;
JITInstanceOfGenerator& gen = m_instanceOfs[m_instanceOfIndex++];
Label coldPathBegin = label();
Call call = callOperation(operationInstanceOfOptimize, resultVReg, TrustedImmPtr(m_codeBlock->globalObject()), gen.stubInfo(), regT2, regT1);
gen.reportSlowPathCall(coldPathBegin, call);
}
void JIT::emit_op_instanceof_custom(const Instruction*)
{
// This always goes to slow path since we expect it to be rare.
addSlowCase(jump());
}
void JIT::emit_op_is_empty(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpIsEmpty>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister value = bytecode.m_operand;
emitGetVirtualRegister(value, regT0);
compare64(Equal, regT0, TrustedImm32(JSValue::encode(JSValue())), regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
emitPutVirtualRegister(dst);
}
void JIT::emit_op_typeof_is_undefined(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpTypeofIsUndefined>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister value = bytecode.m_operand;
emitGetVirtualRegister(value, regT0);
Jump isCell = branchIfCell(regT0);
compare64(Equal, regT0, TrustedImm32(JSValue::ValueUndefined), regT0);
Jump done = jump();
isCell.link(this);
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(0), regT0);
Jump notMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
emitLoadStructure(vm(), regT0, regT1, regT2);
move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
loadPtr(Address(regT1, Structure::globalObjectOffset()), regT1);
comparePtr(Equal, regT0, regT1, regT0);
notMasqueradesAsUndefined.link(this);
done.link(this);
boxBoolean(regT0, JSValueRegs { regT0 });
emitPutVirtualRegister(dst);
}
void JIT::emit_op_is_undefined_or_null(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpIsUndefinedOrNull>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister value = bytecode.m_operand;
emitGetVirtualRegister(value, regT0);
and64(TrustedImm32(~JSValue::UndefinedTag), regT0);
compare64(Equal, regT0, TrustedImm32(JSValue::ValueNull), regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
emitPutVirtualRegister(dst);
}
void JIT::emit_op_is_boolean(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpIsBoolean>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister value = bytecode.m_operand;
emitGetVirtualRegister(value, regT0);
xor64(TrustedImm32(JSValue::ValueFalse), regT0);
test64(Zero, regT0, TrustedImm32(static_cast<int32_t>(~1)), regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
emitPutVirtualRegister(dst);
}
void JIT::emit_op_is_number(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpIsNumber>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister value = bytecode.m_operand;
emitGetVirtualRegister(value, regT0);
test64(NonZero, regT0, numberTagRegister, regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
emitPutVirtualRegister(dst);
}
#if USE(BIGINT32)
void JIT::emit_op_is_big_int(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpIsBigInt>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister value = bytecode.m_operand;
emitGetVirtualRegister(value, regT0);
Jump isCell = branchIfCell(regT0);
move(TrustedImm64(JSValue::BigInt32Mask), regT1);
and64(regT1, regT0);
compare64(Equal, regT0, TrustedImm32(JSValue::BigInt32Tag), regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
Jump done = jump();
isCell.link(this);
compare8(Equal, Address(regT0, JSCell::typeInfoTypeOffset()), TrustedImm32(HeapBigIntType), regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
done.link(this);
emitPutVirtualRegister(dst);
}
#else // if !USE(BIGINT32)
NO_RETURN void JIT::emit_op_is_big_int(const Instruction*)
{
// If we only have HeapBigInts, then we emit isCellWithType instead of isBigInt.
RELEASE_ASSERT_NOT_REACHED();
}
#endif
void JIT::emit_op_is_cell_with_type(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpIsCellWithType>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister value = bytecode.m_operand;
int type = bytecode.m_type;
emitGetVirtualRegister(value, regT0);
Jump isNotCell = branchIfNotCell(regT0);
compare8(Equal, Address(regT0, JSCell::typeInfoTypeOffset()), TrustedImm32(type), regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
Jump done = jump();
isNotCell.link(this);
move(TrustedImm32(JSValue::ValueFalse), regT0);
done.link(this);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_is_object(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpIsObject>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister value = bytecode.m_operand;
emitGetVirtualRegister(value, regT0);
Jump isNotCell = branchIfNotCell(regT0);
compare8(AboveOrEqual, Address(regT0, JSCell::typeInfoTypeOffset()), TrustedImm32(ObjectType), regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
Jump done = jump();
isNotCell.link(this);
move(TrustedImm32(JSValue::ValueFalse), regT0);
done.link(this);
emitPutVirtualRegister(dst);
}
void JIT::emit_op_ret(const Instruction* currentInstruction)
{
ASSERT(callFrameRegister != regT1);
ASSERT(regT1 != returnValueGPR);
ASSERT(returnValueGPR != callFrameRegister);
// Return the result in %eax.
auto bytecode = currentInstruction->as<OpRet>();
emitGetVirtualRegister(bytecode.m_value, returnValueGPR);
checkStackPointerAlignment();
emitRestoreCalleeSaves();
emitFunctionEpilogue();
ret();
}
void JIT::emit_op_to_primitive(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpToPrimitive>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister src = bytecode.m_src;
emitGetVirtualRegister(src, regT0);
Jump isImm = branchIfNotCell(regT0);
addSlowCase(branchIfObject(regT0));
isImm.link(this);
if (dst != src)
emitPutVirtualRegister(dst);
}
void JIT::emit_op_to_property_key(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpToPropertyKey>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister src = bytecode.m_src;
emitGetVirtualRegister(src, regT0);
addSlowCase(branchIfNotCell(regT0));
Jump done = branchIfSymbol(regT0);
addSlowCase(branchIfNotString(regT0));
done.link(this);
if (src != dst)
emitPutVirtualRegister(dst);
}
void JIT::emit_op_set_function_name(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpSetFunctionName>();
emitGetVirtualRegister(bytecode.m_function, regT0);
emitGetVirtualRegister(bytecode.m_name, regT1);
callOperation(operationSetFunctionName, TrustedImmPtr(m_codeBlock->globalObject()), regT0, regT1);
}
void JIT::emit_op_not(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpNot>();
emitGetVirtualRegister(bytecode.m_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(JSValue::ValueFalse), regT0);
addSlowCase(branchTestPtr(NonZero, regT0, TrustedImm32(static_cast<int32_t>(~1))));
xor64(TrustedImm32(JSValue::ValueTrue), regT0);
emitPutVirtualRegister(bytecode.m_dst);
}
void JIT::emit_op_jfalse(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpJfalse>();
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
GPRReg value = regT0;
GPRReg scratch1 = regT1;
GPRReg scratch2 = regT2;
bool shouldCheckMasqueradesAsUndefined = true;
emitGetVirtualRegister(bytecode.m_condition, value);
addJump(branchIfFalsey(vm(), JSValueRegs(value), scratch1, scratch2, fpRegT0, fpRegT1, shouldCheckMasqueradesAsUndefined, m_codeBlock->globalObject()), target);
}
void JIT::emit_op_jeq_null(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpJeqNull>();
VirtualRegister src = bytecode.m_value;
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
emitGetVirtualRegister(src, regT0);
Jump isImmediate = branchIfNotCell(regT0);
// First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
Jump isNotMasqueradesAsUndefined = branchTest8(Zero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
emitLoadStructure(vm(), regT0, regT2, regT1);
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(~JSValue::UndefinedTag), regT0);
addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNull()))), target);
isNotMasqueradesAsUndefined.link(this);
masqueradesGlobalObjectIsForeign.link(this);
};
void JIT::emit_op_jneq_null(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpJneqNull>();
VirtualRegister src = bytecode.m_value;
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
emitGetVirtualRegister(src, regT0);
Jump isImmediate = branchIfNotCell(regT0);
// First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
addJump(branchTest8(Zero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
emitLoadStructure(vm(), regT0, regT2, regT1);
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(~JSValue::UndefinedTag), regT0);
addJump(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsNull()))), target);
wasNotImmediate.link(this);
}
void JIT::emit_op_jundefined_or_null(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpJundefinedOrNull>();
VirtualRegister value = bytecode.m_value;
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
emitGetVirtualRegister(value, regT0);
and64(TrustedImm32(~JSValue::UndefinedTag), regT0);
addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNull()))), target);
}
void JIT::emit_op_jnundefined_or_null(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpJnundefinedOrNull>();
VirtualRegister value = bytecode.m_value;
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
emitGetVirtualRegister(value, regT0);
and64(TrustedImm32(~JSValue::UndefinedTag), regT0);
addJump(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsNull()))), target);
}
void JIT::emit_op_jneq_ptr(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpJneqPtr>();
auto& metadata = bytecode.metadata(m_codeBlock);
VirtualRegister src = bytecode.m_value;
JSValue specialPointer = getConstantOperand(bytecode.m_specialPointer);
ASSERT(specialPointer.isCell());
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
emitGetVirtualRegister(src, regT0);
CCallHelpers::Jump equal = branchPtr(Equal, regT0, TrustedImmPtr(specialPointer.asCell()));
store8(TrustedImm32(1), &metadata.m_hasJumped);
addJump(jump(), target);
equal.link(this);
}
void JIT::emit_op_eq(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpEq>();
emitGetVirtualRegisters(bytecode.m_lhs, regT0, bytecode.m_rhs, regT1);
emitJumpSlowCaseIfNotInt(regT0, regT1, regT2);
compare32(Equal, regT1, regT0, regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
emitPutVirtualRegister(bytecode.m_dst);
}
void JIT::emit_op_jeq(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpJeq>();
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
emitGetVirtualRegisters(bytecode.m_lhs, regT0, bytecode.m_rhs, regT1);
emitJumpSlowCaseIfNotInt(regT0, regT1, regT2);
addJump(branch32(Equal, regT0, regT1), target);
}
void JIT::emit_op_jtrue(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpJtrue>();
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
GPRReg value = regT0;
GPRReg scratch1 = regT1;
GPRReg scratch2 = regT2;
bool shouldCheckMasqueradesAsUndefined = true;
emitGetVirtualRegister(bytecode.m_condition, value);
addJump(branchIfTruthy(vm(), JSValueRegs(value), scratch1, scratch2, fpRegT0, fpRegT1, shouldCheckMasqueradesAsUndefined, m_codeBlock->globalObject()), target);
}
void JIT::emit_op_neq(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpNeq>();
emitGetVirtualRegisters(bytecode.m_lhs, regT0, bytecode.m_rhs, regT1);
emitJumpSlowCaseIfNotInt(regT0, regT1, regT2);
compare32(NotEqual, regT1, regT0, regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
emitPutVirtualRegister(bytecode.m_dst);
}
void JIT::emit_op_jneq(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpJneq>();
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
emitGetVirtualRegisters(bytecode.m_lhs, regT0, bytecode.m_rhs, regT1);
emitJumpSlowCaseIfNotInt(regT0, regT1, regT2);
addJump(branch32(NotEqual, regT0, regT1), target);
}
void JIT::emit_op_throw(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpThrow>();
ASSERT(regT0 == returnValueGPR);
copyCalleeSavesToEntryFrameCalleeSavesBuffer(vm().topEntryFrame);
emitGetVirtualRegister(bytecode.m_value, regT0);
callOperationNoExceptionCheck(operationThrow, TrustedImmPtr(m_codeBlock->globalObject()), regT0);
jumpToExceptionHandler(vm());
}
template<typename Op>
void JIT::compileOpStrictEq(const Instruction* currentInstruction, CompileOpStrictEqType type)
{
auto bytecode = currentInstruction->as<Op>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister src1 = bytecode.m_lhs;
VirtualRegister src2 = bytecode.m_rhs;
emitGetVirtualRegisters(src1, regT0, src2, regT1);
#if USE(BIGINT32)
/* At a high level we do (assuming 'type' to be StrictEq):
If (left is Double || right is Double)
goto slowPath;
result = (left == right);
if (result)
goto done;
if (left is Cell || right is Cell)
goto slowPath;
done:
return result;
*/
// This fragment implements (left is Double || right is Double), with a single branch instead of the 4 that would be naively required if we used branchIfInt32/branchIfNumber
// The trick is that if a JSValue is an Int32, then adding 1<<49 to it will make it overflow, leaving all high bits at 0
// If it is not a number at all, then 1<<49 will be its only high bit set
// Leaving only doubles above or equal 1<<50.
move(regT0, regT2);
move(regT1, regT3);
move(TrustedImm64(JSValue::LowestOfHighBits), regT5);
add64(regT5, regT2);
add64(regT5, regT3);
lshift64(TrustedImm32(1), regT5);
or64(regT2, regT3);
addSlowCase(branch64(AboveOrEqual, regT3, regT5));
compare64(Equal, regT0, regT1, regT5);
Jump done = branchTest64(NonZero, regT5);
move(regT0, regT2);
// Jump slow if at least one is a cell (to cover strings and BigInts).
and64(regT1, regT2);
// FIXME: we could do something more precise: unless there is a BigInt32, we only need to do the slow path if both are strings
addSlowCase(branchIfCell(regT2));
done.link(this);
if (type == CompileOpStrictEqType::NStrictEq)
xor64(TrustedImm64(1), regT5);
boxBoolean(regT5, JSValueRegs { regT5 });
emitPutVirtualRegister(dst, regT5);
#else // if !USE(BIGINT32)
// Jump slow if both are cells (to cover strings).
move(regT0, regT2);
or64(regT1, regT2);
addSlowCase(branchIfCell(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 = branchIfInt32(regT0);
addSlowCase(branchIfNumber(regT0));
leftOK.link(this);
Jump rightOK = branchIfInt32(regT1);
addSlowCase(branchIfNumber(regT1));
rightOK.link(this);
if (type == CompileOpStrictEqType::StrictEq)
compare64(Equal, regT1, regT0, regT0);
else
compare64(NotEqual, regT1, regT0, regT0);
boxBoolean(regT0, JSValueRegs { regT0 });
emitPutVirtualRegister(dst);
#endif
}
void JIT::emit_op_stricteq(const Instruction* currentInstruction)
{
compileOpStrictEq<OpStricteq>(currentInstruction, CompileOpStrictEqType::StrictEq);
}
void JIT::emit_op_nstricteq(const Instruction* currentInstruction)
{
compileOpStrictEq<OpNstricteq>(currentInstruction, CompileOpStrictEqType::NStrictEq);
}
template<typename Op>
void JIT::compileOpStrictEqJump(const Instruction* currentInstruction, CompileOpStrictEqType type)
{
auto bytecode = currentInstruction->as<Op>();
int target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
VirtualRegister src1 = bytecode.m_lhs;
VirtualRegister src2 = bytecode.m_rhs;
emitGetVirtualRegisters(src1, regT0, src2, regT1);
#if USE(BIGINT32)
/* At a high level we do (assuming 'type' to be StrictEq):
If (left is Double || right is Double)
goto slowPath;
if (left == right)
goto taken;
if (left is Cell || right is Cell)
goto slowPath;
goto notTaken;
*/
// This fragment implements (left is Double || right is Double), with a single branch instead of the 4 that would be naively required if we used branchIfInt32/branchIfNumber
// The trick is that if a JSValue is an Int32, then adding 1<<49 to it will make it overflow, leaving all high bits at 0
// If it is not a number at all, then 1<<49 will be its only high bit set
// Leaving only doubles above or equal 1<<50.
move(regT0, regT2);
move(regT1, regT3);
move(TrustedImm64(JSValue::LowestOfHighBits), regT5);
add64(regT5, regT2);
add64(regT5, regT3);
lshift64(TrustedImm32(1), regT5);
or64(regT2, regT3);
addSlowCase(branch64(AboveOrEqual, regT3, regT5));
Jump areEqual = branch64(Equal, regT0, regT1);
if (type == CompileOpStrictEqType::StrictEq)
addJump(areEqual, target);
move(regT0, regT2);
// Jump slow if at least one is a cell (to cover strings and BigInts).
and64(regT1, regT2);
// FIXME: we could do something more precise: unless there is a BigInt32, we only need to do the slow path if both are strings
addSlowCase(branchIfCell(regT2));
if (type == CompileOpStrictEqType::NStrictEq) {
addJump(jump(), target);
areEqual.link(this);
}
#else // if !USE(BIGINT32)
// Jump slow if both are cells (to cover strings).
move(regT0, regT2);
or64(regT1, regT2);
addSlowCase(branchIfCell(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 = branchIfInt32(regT0);
addSlowCase(branchIfNumber(regT0));
leftOK.link(this);
Jump rightOK = branchIfInt32(regT1);
addSlowCase(branchIfNumber(regT1));
rightOK.link(this);
if (type == CompileOpStrictEqType::StrictEq)
addJump(branch64(Equal, regT1, regT0), target);
else
addJump(branch64(NotEqual, regT1, regT0), target);
#endif
}
void JIT::emit_op_jstricteq(const Instruction* currentInstruction)
{
compileOpStrictEqJump<OpJstricteq>(currentInstruction, CompileOpStrictEqType::StrictEq);
}
void JIT::emit_op_jnstricteq(const Instruction* currentInstruction)
{
compileOpStrictEqJump<OpJnstricteq>(currentInstruction, CompileOpStrictEqType::NStrictEq);
}
void JIT::emitSlow_op_jstricteq(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkAllSlowCases(iter);
auto bytecode = currentInstruction->as<OpJstricteq>();
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
callOperation(operationCompareStrictEq, TrustedImmPtr(m_codeBlock->globalObject()), regT0, regT1);
emitJumpSlowToHot(branchTest32(NonZero, returnValueGPR), target);
}
void JIT::emitSlow_op_jnstricteq(const Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkAllSlowCases(iter);
auto bytecode = currentInstruction->as<OpJnstricteq>();
unsigned target = jumpTarget(currentInstruction, bytecode.m_targetLabel);
callOperation(operationCompareStrictEq, TrustedImmPtr(m_codeBlock->globalObject()), regT0, regT1);
emitJumpSlowToHot(branchTest32(Zero, returnValueGPR), target);
}
void JIT::emit_op_to_number(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpToNumber>();
VirtualRegister dstVReg = bytecode.m_dst;
VirtualRegister srcVReg = bytecode.m_operand;
emitGetVirtualRegister(srcVReg, regT0);
addSlowCase(branchIfNotNumber(regT0));
emitValueProfilingSite(bytecode.metadata(m_codeBlock));
if (srcVReg != dstVReg)
emitPutVirtualRegister(dstVReg);
}
void JIT::emit_op_to_numeric(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpToNumeric>();
VirtualRegister dstVReg = bytecode.m_dst;
VirtualRegister srcVReg = bytecode.m_operand;
emitGetVirtualRegister(srcVReg, regT0);
Jump isNotCell = branchIfNotCell(regT0);
addSlowCase(branchIfNotHeapBigInt(regT0));
Jump isBigInt = jump();
isNotCell.link(this);
addSlowCase(branchIfNotNumber(regT0));
isBigInt.link(this);
emitValueProfilingSite(bytecode.metadata(m_codeBlock));
if (srcVReg != dstVReg)
emitPutVirtualRegister(dstVReg);
}
void JIT::emit_op_to_string(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpToString>();
VirtualRegister srcVReg = bytecode.m_operand;
emitGetVirtualRegister(srcVReg, regT0);
addSlowCase(branchIfNotCell(regT0));
addSlowCase(branchIfNotString(regT0));
emitPutVirtualRegister(bytecode.m_dst);
}
void JIT::emit_op_to_object(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpToObject>();
VirtualRegister dstVReg = bytecode.m_dst;
VirtualRegister srcVReg = bytecode.m_operand;
emitGetVirtualRegister(srcVReg, regT0);
addSlowCase(branchIfNotCell(regT0));
addSlowCase(branchIfNotObject(regT0));
emitValueProfilingSite(bytecode.metadata(m_codeBlock));
if (srcVReg != dstVReg)
emitPutVirtualRegister(dstVReg);
}
void JIT::emit_op_catch(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpCatch>();
restoreCalleeSavesFromEntryFrameCalleeSavesBuffer(vm().topEntryFrame);
move(TrustedImmPtr(m_vm), regT3);
load64(Address(regT3, VM::callFrameForCatchOffset()), callFrameRegister);
storePtr(TrustedImmPtr(nullptr), Address(regT3, VM::callFrameForCatchOffset()));
addPtr(TrustedImm32(stackPointerOffsetFor(codeBlock()) * sizeof(Register)), callFrameRegister, stackPointerRegister);
callOperationNoExceptionCheck(operationCheckIfExceptionIsUncatchableAndNotifyProfiler, TrustedImmPtr(&vm()));
Jump isCatchableException = branchTest32(Zero, returnValueGPR);
jumpToExceptionHandler(vm());
isCatchableException.link(this);
move(TrustedImmPtr(m_vm), regT3);
load64(Address(regT3, VM::exceptionOffset()), regT0);
store64(TrustedImm64(JSValue::encode(JSValue())), Address(regT3, VM::exceptionOffset()));
emitPutVirtualRegister(bytecode.m_exception);
load64(Address(regT0, Exception::valueOffset()), regT0);
emitPutVirtualRegister(bytecode.m_thrownValue);
#if ENABLE(DFG_JIT)
// FIXME: consider inline caching the process of doing OSR entry, including
// argument type proofs, storing locals to the buffer, etc
// https://bugs.webkit.org/show_bug.cgi?id=175598
auto& metadata = bytecode.metadata(m_codeBlock);
ValueProfileAndVirtualRegisterBuffer* buffer = metadata.m_buffer;
if (buffer || !shouldEmitProfiling())
callOperation(operationTryOSREnterAtCatch, &vm(), m_bytecodeIndex.asBits());
else
callOperation(operationTryOSREnterAtCatchAndValueProfile, &vm(), m_bytecodeIndex.asBits());
auto skipOSREntry = branchTestPtr(Zero, returnValueGPR);
emitRestoreCalleeSaves();
farJump(returnValueGPR, ExceptionHandlerPtrTag);
skipOSREntry.link(this);
if (buffer && shouldEmitProfiling()) {
buffer->forEach([&] (ValueProfileAndVirtualRegister& profile) {
JSValueRegs regs(regT0);
emitGetVirtualRegister(profile.m_operand, regs);
emitValueProfilingSite(static_cast<ValueProfile&>(profile));
});
}
#endif // ENABLE(DFG_JIT)
}
void JIT::emit_op_identity_with_profile(const Instruction*)
{
// We don't need to do anything here...
}
void JIT::emit_op_get_parent_scope(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpGetParentScope>();
VirtualRegister currentScope = bytecode.m_scope;
emitGetVirtualRegister(currentScope, regT0);
loadPtr(Address(regT0, JSScope::offsetOfNext()), regT0);
emitStoreCell(bytecode.m_dst, regT0);
}
void JIT::emit_op_switch_imm(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpSwitchImm>();
size_t tableIndex = bytecode.m_tableIndex;
unsigned defaultOffset = jumpTarget(currentInstruction, bytecode.m_defaultOffset);
VirtualRegister scrutinee = bytecode.m_scrutinee;
// create jump table for switch destinations, track this switch statement.
SimpleJumpTable* jumpTable = &m_codeBlock->switchJumpTable(tableIndex);
m_switches.append(SwitchRecord(jumpTable, m_bytecodeIndex, defaultOffset, SwitchRecord::Immediate));
jumpTable->ensureCTITable();
emitGetVirtualRegister(scrutinee, regT0);
callOperation(operationSwitchImmWithUnknownKeyType, TrustedImmPtr(&vm()), regT0, tableIndex);
farJump(returnValueGPR, JSSwitchPtrTag);
}
void JIT::emit_op_switch_char(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpSwitchChar>();
size_t tableIndex = bytecode.m_tableIndex;
unsigned defaultOffset = jumpTarget(currentInstruction, bytecode.m_defaultOffset);
VirtualRegister scrutinee = bytecode.m_scrutinee;
// create jump table for switch destinations, track this switch statement.
SimpleJumpTable* jumpTable = &m_codeBlock->switchJumpTable(tableIndex);
m_switches.append(SwitchRecord(jumpTable, m_bytecodeIndex, defaultOffset, SwitchRecord::Character));
jumpTable->ensureCTITable();
emitGetVirtualRegister(scrutinee, regT0);
callOperation(operationSwitchCharWithUnknownKeyType, TrustedImmPtr(m_codeBlock->globalObject()), regT0, tableIndex);
farJump(returnValueGPR, JSSwitchPtrTag);
}
void JIT::emit_op_switch_string(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpSwitchString>();
size_t tableIndex = bytecode.m_tableIndex;
unsigned defaultOffset = jumpTarget(currentInstruction, bytecode.m_defaultOffset);
VirtualRegister scrutinee = bytecode.m_scrutinee;
// create jump table for switch destinations, track this switch statement.
StringJumpTable* jumpTable = &m_codeBlock->stringSwitchJumpTable(tableIndex);
m_switches.append(SwitchRecord(jumpTable, m_bytecodeIndex, defaultOffset));
emitGetVirtualRegister(scrutinee, regT0);
callOperation(operationSwitchStringWithUnknownKeyType, TrustedImmPtr(m_codeBlock->globalObject()), regT0, tableIndex);
farJump(returnValueGPR, JSSwitchPtrTag);
}
void JIT::emit_op_debug(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpDebug>();
load32(codeBlock()->debuggerRequestsAddress(), regT0);
Jump noDebuggerRequests = branchTest32(Zero, regT0);
callOperation(operationDebug, &vm(), static_cast<int>(bytecode.m_debugHookType));
noDebuggerRequests.link(this);
}
void JIT::emit_op_eq_null(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpEqNull>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister src1 = bytecode.m_operand;
emitGetVirtualRegister(src1, regT0);
Jump isImmediate = branchIfNotCell(regT0);
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(0), regT0);
Jump wasNotMasqueradesAsUndefined = jump();
isMasqueradesAsUndefined.link(this);
emitLoadStructure(vm(), regT0, regT2, regT1);
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(~JSValue::UndefinedTag), regT0);
compare64(Equal, regT0, TrustedImm32(JSValue::ValueNull), regT0);
wasNotImmediate.link(this);
wasNotMasqueradesAsUndefined.link(this);
boxBoolean(regT0, JSValueRegs { regT0 });
emitPutVirtualRegister(dst);
}
void JIT::emit_op_neq_null(const Instruction* currentInstruction)
{
auto bytecode = currentInstruction->as<OpNeqNull>();
VirtualRegister dst = bytecode.m_dst;
VirtualRegister src1 = bytecode.m_operand;
emitGetVirtualRegister(src1, regT0);
Jump isImmediate = branchIfNotCell(regT0);
Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT0, JSCell::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
move(TrustedImm32(1), regT0);
Jump wasNotMasqueradesAsUndefined = jump();