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/*
* Copyright (C) 2019-2021 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.
*/
#include "config.h"
#include "UnlinkedCodeBlockGenerator.h"
#include "BytecodeRewriter.h"
#include "InstructionStream.h"
#include "JSCJSValueInlines.h"
#include "PreciseJumpTargets.h"
#include "UnlinkedMetadataTableInlines.h"
namespace JSC {
inline void UnlinkedCodeBlockGenerator::getLineAndColumn(const ExpressionRangeInfo& info, unsigned& line, unsigned& column) const
{
switch (info.mode) {
case ExpressionRangeInfo::FatLineMode:
info.decodeFatLineMode(line, column);
break;
case ExpressionRangeInfo::FatColumnMode:
info.decodeFatColumnMode(line, column);
break;
case ExpressionRangeInfo::FatLineAndColumnMode: {
unsigned fatIndex = info.position;
const ExpressionRangeInfo::FatPosition& fatPos = m_expressionInfoFatPositions[fatIndex];
line = fatPos.line;
column = fatPos.column;
break;
}
} // switch
}
void UnlinkedCodeBlockGenerator::addExpressionInfo(unsigned instructionOffset, int divot, int startOffset, int endOffset, unsigned line, unsigned column)
{
if (divot > ExpressionRangeInfo::MaxDivot) {
// Overflow has occurred, we can only give line number info for errors for this region
divot = 0;
startOffset = 0;
endOffset = 0;
} else if (startOffset > ExpressionRangeInfo::MaxOffset) {
// If the start offset is out of bounds we clear both offsets
// so we only get the divot marker. Error message will have to be reduced
// to line and charPosition number.
startOffset = 0;
endOffset = 0;
} else if (endOffset > ExpressionRangeInfo::MaxOffset) {
// The end offset is only used for additional context, and is much more likely
// to overflow (eg. function call arguments) so we are willing to drop it without
// dropping the rest of the range.
endOffset = 0;
}
unsigned positionMode =
(line <= ExpressionRangeInfo::MaxFatLineModeLine && column <= ExpressionRangeInfo::MaxFatLineModeColumn)
? ExpressionRangeInfo::FatLineMode
: (line <= ExpressionRangeInfo::MaxFatColumnModeLine && column <= ExpressionRangeInfo::MaxFatColumnModeColumn)
? ExpressionRangeInfo::FatColumnMode
: ExpressionRangeInfo::FatLineAndColumnMode;
ExpressionRangeInfo info;
info.instructionOffset = instructionOffset;
info.divotPoint = divot;
info.startOffset = startOffset;
info.endOffset = endOffset;
info.mode = positionMode;
switch (positionMode) {
case ExpressionRangeInfo::FatLineMode:
info.encodeFatLineMode(line, column);
break;
case ExpressionRangeInfo::FatColumnMode:
info.encodeFatColumnMode(line, column);
break;
case ExpressionRangeInfo::FatLineAndColumnMode: {
unsigned fatIndex = m_expressionInfoFatPositions.size();
ExpressionRangeInfo::FatPosition fatPos = { line, column };
m_expressionInfoFatPositions.append(fatPos);
info.position = fatIndex;
}
} // switch
m_expressionInfo.append(info);
}
void UnlinkedCodeBlockGenerator::addTypeProfilerExpressionInfo(unsigned instructionOffset, unsigned startDivot, unsigned endDivot)
{
UnlinkedCodeBlock::RareData::TypeProfilerExpressionRange range;
range.m_startDivot = startDivot;
range.m_endDivot = endDivot;
m_typeProfilerInfoMap.set(instructionOffset, range);
}
void UnlinkedCodeBlockGenerator::finalize(std::unique_ptr<JSInstructionStream> instructions)
{
ASSERT(instructions);
{
Locker locker { m_codeBlock->cellLock() };
m_codeBlock->m_instructions = WTFMove(instructions);
m_codeBlock->allocateSharedProfiles(m_numBinaryArithProfiles, m_numUnaryArithProfiles);
m_codeBlock->m_metadata->finalize();
m_codeBlock->m_jumpTargets = WTFMove(m_jumpTargets);
m_codeBlock->m_identifiers = WTFMove(m_identifiers);
m_codeBlock->m_constantRegisters = WTFMove(m_constantRegisters);
m_codeBlock->m_constantsSourceCodeRepresentation = WTFMove(m_constantsSourceCodeRepresentation);
m_codeBlock->m_functionDecls = WTFMove(m_functionDecls);
m_codeBlock->m_functionExprs = WTFMove(m_functionExprs);
m_codeBlock->m_expressionInfo = WTFMove(m_expressionInfo);
m_codeBlock->m_outOfLineJumpTargets = WTFMove(m_outOfLineJumpTargets);
if (!m_codeBlock->m_rareData) {
if (!m_exceptionHandlers.isEmpty()
|| !m_unlinkedSwitchJumpTables.isEmpty()
|| !m_unlinkedStringSwitchJumpTables.isEmpty()
|| !m_expressionInfoFatPositions.isEmpty()
|| !m_typeProfilerInfoMap.isEmpty()
|| !m_opProfileControlFlowBytecodeOffsets.isEmpty()
|| !m_bitVectors.isEmpty()
|| !m_constantIdentifierSets.isEmpty())
m_codeBlock->createRareDataIfNecessary(locker);
}
if (m_codeBlock->m_rareData) {
m_codeBlock->m_rareData->m_exceptionHandlers = WTFMove(m_exceptionHandlers);
m_codeBlock->m_rareData->m_unlinkedSwitchJumpTables = WTFMove(m_unlinkedSwitchJumpTables);
m_codeBlock->m_rareData->m_unlinkedStringSwitchJumpTables = WTFMove(m_unlinkedStringSwitchJumpTables);
m_codeBlock->m_rareData->m_expressionInfoFatPositions = WTFMove(m_expressionInfoFatPositions);
m_codeBlock->m_rareData->m_typeProfilerInfoMap = WTFMove(m_typeProfilerInfoMap);
m_codeBlock->m_rareData->m_opProfileControlFlowBytecodeOffsets = WTFMove(m_opProfileControlFlowBytecodeOffsets);
m_codeBlock->m_rareData->m_bitVectors = WTFMove(m_bitVectors);
m_codeBlock->m_rareData->m_constantIdentifierSets = WTFMove(m_constantIdentifierSets);
}
if (UNLIKELY(Options::returnEarlyFromInfiniteLoopsForFuzzing()))
m_codeBlock->initializeLoopHintExecutionCounter();
}
m_vm.writeBarrier(m_codeBlock.get());
m_vm.heap.reportExtraMemoryAllocated(m_codeBlock->m_instructions->sizeInBytes() + m_codeBlock->m_metadata->sizeInBytes());
}
UnlinkedHandlerInfo* UnlinkedCodeBlockGenerator::handlerForBytecodeIndex(BytecodeIndex bytecodeIndex, RequiredHandler requiredHandler)
{
return handlerForIndex(bytecodeIndex.offset(), requiredHandler);
}
UnlinkedHandlerInfo* UnlinkedCodeBlockGenerator::handlerForIndex(unsigned index, RequiredHandler requiredHandler)
{
return UnlinkedHandlerInfo::handlerForIndex<UnlinkedHandlerInfo>(m_exceptionHandlers, index, requiredHandler);
}
void UnlinkedCodeBlockGenerator::applyModification(BytecodeRewriter& rewriter, JSInstructionStreamWriter& instructions)
{
// Before applying the changes, we adjust the jumps based on the original bytecode offset, the offset to the jump target, and
// the insertion information.
rewriter.adjustJumpTargets();
// Then, exception handlers should be adjusted.
for (UnlinkedHandlerInfo& handler : m_exceptionHandlers) {
handler.target = rewriter.adjustAbsoluteOffset(handler.target);
handler.start = rewriter.adjustAbsoluteOffset(handler.start);
handler.end = rewriter.adjustAbsoluteOffset(handler.end);
}
for (size_t i = 0; i < m_opProfileControlFlowBytecodeOffsets.size(); ++i)
m_opProfileControlFlowBytecodeOffsets[i] = rewriter.adjustAbsoluteOffset(m_opProfileControlFlowBytecodeOffsets[i]);
if (!m_typeProfilerInfoMap.isEmpty()) {
HashMap<unsigned, UnlinkedCodeBlock::RareData::TypeProfilerExpressionRange> adjustedTypeProfilerInfoMap;
for (auto& entry : m_typeProfilerInfoMap)
adjustedTypeProfilerInfoMap.set(rewriter.adjustAbsoluteOffset(entry.key), entry.value);
m_typeProfilerInfoMap.swap(adjustedTypeProfilerInfoMap);
}
for (size_t i = 0; i < m_expressionInfo.size(); ++i)
m_expressionInfo[i].instructionOffset = rewriter.adjustAbsoluteOffset(m_expressionInfo[i].instructionOffset);
// Then, modify the unlinked instructions.
rewriter.applyModification();
// And recompute the jump target based on the modified unlinked instructions.
m_jumpTargets.clear();
recomputePreciseJumpTargets(this, instructions, m_jumpTargets);
}
void UnlinkedCodeBlockGenerator::addOutOfLineJumpTarget(JSInstructionStream::Offset bytecodeOffset, int target)
{
RELEASE_ASSERT(target);
m_outOfLineJumpTargets.set(bytecodeOffset, target);
}
int UnlinkedCodeBlockGenerator::outOfLineJumpOffset(JSInstructionStream::Offset bytecodeOffset)
{
ASSERT(m_outOfLineJumpTargets.contains(bytecodeOffset));
return m_outOfLineJumpTargets.get(bytecodeOffset);
}
void UnlinkedCodeBlockGenerator::dump(PrintStream&) const
{
}
} // namespace JSC
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