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/*
* Copyright (C) 2016-2021 Apple Inc. All rights reserved.
*
* 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.
*/
#pragma once
#include "BytecodeGenerator.h"
#include "BytecodeStructs.h"
#include "InterpreterInlines.h"
#include "Opcode.h"
#include "PreciseJumpTargets.h"
namespace JSC {
#define SWITCH_JMP(CASE_OP, SWITCH_CASE) \
switch (instruction->opcodeID()) { \
CASE_OP(OpJmp) \
\
CASE_OP(OpJtrue) \
CASE_OP(OpJfalse) \
CASE_OP(OpJeqNull) \
CASE_OP(OpJneqNull) \
CASE_OP(OpJundefinedOrNull) \
CASE_OP(OpJnundefinedOrNull) \
CASE_OP(OpJeqPtr) \
CASE_OP(OpJneqPtr) \
\
CASE_OP(OpJless) \
CASE_OP(OpJlesseq) \
CASE_OP(OpJgreater) \
CASE_OP(OpJgreatereq) \
CASE_OP(OpJnless) \
CASE_OP(OpJnlesseq) \
CASE_OP(OpJngreater) \
CASE_OP(OpJngreatereq) \
CASE_OP(OpJeq) \
CASE_OP(OpJneq) \
CASE_OP(OpJstricteq) \
CASE_OP(OpJnstricteq) \
CASE_OP(OpJbelow) \
CASE_OP(OpJbeloweq) \
case op_switch_imm: { \
auto bytecode = instruction->as<OpSwitchImm>(); \
auto& table = codeBlock->unlinkedSwitchJumpTable(bytecode.m_tableIndex); \
for (unsigned i = table.m_branchOffsets.size(); i--;) \
SWITCH_CASE(table.m_branchOffsets[i]); \
SWITCH_CASE(table.m_defaultOffset); \
break; \
} \
case op_switch_char: { \
auto bytecode = instruction->as<OpSwitchChar>(); \
auto& table = codeBlock->unlinkedSwitchJumpTable(bytecode.m_tableIndex); \
for (unsigned i = table.m_branchOffsets.size(); i--;) \
SWITCH_CASE(table.m_branchOffsets[i]); \
SWITCH_CASE(table.m_defaultOffset); \
break; \
} \
case op_switch_string: { \
auto bytecode = instruction->as<OpSwitchString>(); \
auto& table = codeBlock->unlinkedStringSwitchJumpTable(bytecode.m_tableIndex); \
for (auto& entry : table.m_offsetTable) \
SWITCH_CASE(entry.value.m_branchOffset); \
SWITCH_CASE(table.m_defaultOffset); \
break; \
} \
default: \
break; \
} \
template<typename Block>
inline int jumpTargetForInstruction(Block* codeBlock, const JSInstructionStream::Ref& instruction, unsigned target)
{
if (target)
return target;
return codeBlock->outOfLineJumpOffset(instruction);
}
template<typename UncheckedKeyHashMap>
inline int jumpTargetForInstruction(UncheckedKeyHashMap& outOfLineJumpTargets, const JSInstructionStream::Ref& instruction, unsigned target)
{
if (target)
return target;
ASSERT(outOfLineJumpTargets.contains(instruction.offset()));
return outOfLineJumpTargets.get(instruction.offset());
}
template<typename Op, typename Block>
inline int jumpTargetForInstruction(Block&& codeBlock, const JSInstructionStream::Ref& instruction)
{
auto bytecode = instruction->as<Op>();
return jumpTargetForInstruction(codeBlock, instruction, bytecode.m_targetLabel);
}
template<typename Block, typename Function>
inline void extractStoredJumpTargetsForInstruction(Block&& codeBlock, const JSInstructionStream::Ref& instruction, NOESCAPE const Function& function)
{
#define CASE_OP(__op) \
case __op::opcodeID: \
function(jumpTargetForInstruction<__op>(codeBlock, instruction)); \
break;
#define SWITCH_CASE(__target) \
function(__target)
SWITCH_JMP(CASE_OP, SWITCH_CASE)
#undef CASE_OP
#undef SWITCH_CASE
}
template<typename Block, typename Function, typename CodeBlockOrHashMap>
inline void updateStoredJumpTargetsForInstruction(Block&& codeBlock, unsigned finalOffset, JSInstructionStream::MutableRef instruction, NOESCAPE const Function& function, CodeBlockOrHashMap& codeBlockOrHashMap)
{
#define CASE_OP(__op) \
case __op::opcodeID: { \
int32_t target = jumpTargetForInstruction<__op>(codeBlockOrHashMap, instruction); \
int32_t newTarget = function(target); \
instruction->cast<__op>()->setTargetLabel(BoundLabel(newTarget), [&]() { \
codeBlock->addOutOfLineJumpTarget(finalOffset + instruction.offset(), newTarget); \
return BoundLabel(); \
}); \
break; \
}
#define SWITCH_CASE(__target) \
do { \
int32_t target = __target; \
__target = function(target); \
} while (false)
SWITCH_JMP(CASE_OP, SWITCH_CASE)
#undef CASE_OP
#undef JMP_TARGET
}
template<typename Block, typename Function>
inline void updateStoredJumpTargetsForInstruction(Block* codeBlock, unsigned finalOffset, JSInstructionStream::MutableRef instruction, Function function)
{
updateStoredJumpTargetsForInstruction(codeBlock, finalOffset, instruction, function, codeBlock);
}
} // namespace JSC
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