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/*
* Copyright (C) 2012-2019 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "SymbolTable.h"
#include "CodeBlock.h"
#include "JSDestructibleObject.h"
#include "JSCInlines.h"
#include "SlotVisitorInlines.h"
#include "TypeProfiler.h"
namespace JSC {
const ClassInfo SymbolTable::s_info = { "SymbolTable", nullptr, nullptr, nullptr, CREATE_METHOD_TABLE(SymbolTable) };
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(SymbolTableEntryFatEntry);
SymbolTableEntry& SymbolTableEntry::copySlow(const SymbolTableEntry& other)
{
ASSERT(other.isFat());
FatEntry* newFatEntry = new FatEntry(*other.fatEntry());
freeFatEntry();
m_bits = bitwise_cast<intptr_t>(newFatEntry);
return *this;
}
void SymbolTable::destroy(JSCell* cell)
{
SymbolTable* thisObject = static_cast<SymbolTable*>(cell);
thisObject->SymbolTable::~SymbolTable();
}
void SymbolTableEntry::freeFatEntrySlow()
{
ASSERT(isFat());
delete fatEntry();
}
void SymbolTableEntry::prepareToWatch()
{
if (!isWatchable())
return;
FatEntry* entry = inflate();
if (entry->m_watchpoints)
return;
entry->m_watchpoints = adoptRef(new WatchpointSet(ClearWatchpoint));
}
SymbolTableEntry::FatEntry* SymbolTableEntry::inflateSlow()
{
FatEntry* entry = new FatEntry(m_bits);
m_bits = bitwise_cast<intptr_t>(entry);
return entry;
}
SymbolTable::SymbolTable(VM& vm)
: JSCell(vm, vm.symbolTableStructure.get())
, m_usesNonStrictEval(false)
, m_nestedLexicalScope(false)
, m_scopeType(VarScope)
{
}
SymbolTable::~SymbolTable() { }
void SymbolTable::finishCreation(VM& vm)
{
Base::finishCreation(vm);
}
void SymbolTable::visitChildren(JSCell* thisCell, SlotVisitor& visitor)
{
SymbolTable* thisSymbolTable = jsCast<SymbolTable*>(thisCell);
ASSERT_GC_OBJECT_INHERITS(thisSymbolTable, info());
Base::visitChildren(thisSymbolTable, visitor);
visitor.append(thisSymbolTable->m_arguments);
if (thisSymbolTable->m_rareData)
visitor.append(thisSymbolTable->m_rareData->m_codeBlock);
// Save some memory. This is O(n) to rebuild and we do so on the fly.
ConcurrentJSLocker locker(thisSymbolTable->m_lock);
thisSymbolTable->m_localToEntry = nullptr;
}
const SymbolTable::LocalToEntryVec& SymbolTable::localToEntry(const ConcurrentJSLocker&)
{
if (UNLIKELY(!m_localToEntry)) {
unsigned size = 0;
for (auto& entry : m_map) {
VarOffset offset = entry.value.varOffset();
if (offset.isScope())
size = std::max(size, offset.scopeOffset().offset() + 1);
}
m_localToEntry = makeUnique<LocalToEntryVec>(size, nullptr);
for (auto& entry : m_map) {
VarOffset offset = entry.value.varOffset();
if (offset.isScope())
m_localToEntry->at(offset.scopeOffset().offset()) = &entry.value;
}
}
return *m_localToEntry;
}
SymbolTableEntry* SymbolTable::entryFor(const ConcurrentJSLocker& locker, ScopeOffset offset)
{
auto& toEntryVector = localToEntry(locker);
if (offset.offset() >= toEntryVector.size())
return nullptr;
return toEntryVector[offset.offset()];
}
SymbolTable* SymbolTable::cloneScopePart(VM& vm)
{
SymbolTable* result = SymbolTable::create(vm);
result->m_usesNonStrictEval = m_usesNonStrictEval;
result->m_nestedLexicalScope = m_nestedLexicalScope;
result->m_scopeType = m_scopeType;
for (auto iter = m_map.begin(), end = m_map.end(); iter != end; ++iter) {
if (!iter->value.varOffset().isScope())
continue;
result->m_map.add(
iter->key,
SymbolTableEntry(iter->value.varOffset(), iter->value.getAttributes()));
}
result->m_maxScopeOffset = m_maxScopeOffset;
if (ScopedArgumentsTable* arguments = this->arguments())
result->m_arguments.set(vm, result, arguments);
if (m_rareData) {
result->m_rareData = makeUnique<SymbolTableRareData>();
{
auto iter = m_rareData->m_uniqueIDMap.begin();
auto end = m_rareData->m_uniqueIDMap.end();
for (; iter != end; ++iter)
result->m_rareData->m_uniqueIDMap.set(iter->key, iter->value);
}
{
auto iter = m_rareData->m_offsetToVariableMap.begin();
auto end = m_rareData->m_offsetToVariableMap.end();
for (; iter != end; ++iter)
result->m_rareData->m_offsetToVariableMap.set(iter->key, iter->value);
}
{
auto iter = m_rareData->m_uniqueTypeSetMap.begin();
auto end = m_rareData->m_uniqueTypeSetMap.end();
for (; iter != end; ++iter)
result->m_rareData->m_uniqueTypeSetMap.set(iter->key, iter->value);
}
}
return result;
}
void SymbolTable::prepareForTypeProfiling(const ConcurrentJSLocker&)
{
if (m_rareData)
return;
m_rareData = makeUnique<SymbolTableRareData>();
for (auto iter = m_map.begin(), end = m_map.end(); iter != end; ++iter) {
m_rareData->m_uniqueIDMap.set(iter->key, TypeProfilerNeedsUniqueIDGeneration);
m_rareData->m_offsetToVariableMap.set(iter->value.varOffset(), iter->key);
}
}
CodeBlock* SymbolTable::rareDataCodeBlock()
{
if (!m_rareData)
return nullptr;
return m_rareData->m_codeBlock.get();
}
void SymbolTable::setRareDataCodeBlock(CodeBlock* codeBlock)
{
if (!m_rareData)
m_rareData = makeUnique<SymbolTableRareData>();
ASSERT(!m_rareData->m_codeBlock);
m_rareData->m_codeBlock.set(codeBlock->vm(), this, codeBlock);
}
GlobalVariableID SymbolTable::uniqueIDForVariable(const ConcurrentJSLocker&, UniquedStringImpl* key, VM& vm)
{
RELEASE_ASSERT(m_rareData);
auto iter = m_rareData->m_uniqueIDMap.find(key);
auto end = m_rareData->m_uniqueIDMap.end();
if (iter == end)
return TypeProfilerNoGlobalIDExists;
GlobalVariableID id = iter->value;
if (id == TypeProfilerNeedsUniqueIDGeneration) {
id = vm.typeProfiler()->getNextUniqueVariableID();
m_rareData->m_uniqueIDMap.set(key, id);
m_rareData->m_uniqueTypeSetMap.set(key, TypeSet::create()); // Make a new global typeset for this corresponding ID.
}
return id;
}
GlobalVariableID SymbolTable::uniqueIDForOffset(const ConcurrentJSLocker& locker, VarOffset offset, VM& vm)
{
RELEASE_ASSERT(m_rareData);
auto iter = m_rareData->m_offsetToVariableMap.find(offset);
auto end = m_rareData->m_offsetToVariableMap.end();
if (iter == end)
return TypeProfilerNoGlobalIDExists;
return uniqueIDForVariable(locker, iter->value.get(), vm);
}
RefPtr<TypeSet> SymbolTable::globalTypeSetForOffset(const ConcurrentJSLocker& locker, VarOffset offset, VM& vm)
{
RELEASE_ASSERT(m_rareData);
uniqueIDForOffset(locker, offset, vm); // Lazily create the TypeSet if necessary.
auto iter = m_rareData->m_offsetToVariableMap.find(offset);
auto end = m_rareData->m_offsetToVariableMap.end();
if (iter == end)
return nullptr;
return globalTypeSetForVariable(locker, iter->value.get(), vm);
}
RefPtr<TypeSet> SymbolTable::globalTypeSetForVariable(const ConcurrentJSLocker& locker, UniquedStringImpl* key, VM& vm)
{
RELEASE_ASSERT(m_rareData);
uniqueIDForVariable(locker, key, vm); // Lazily create the TypeSet if necessary.
auto iter = m_rareData->m_uniqueTypeSetMap.find(key);
auto end = m_rareData->m_uniqueTypeSetMap.end();
if (iter == end)
return nullptr;
return iter->value;
}
} // namespace JSC