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// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2018 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Qt-Security score:significant
#include <qv4compiler_p.h>
#include <qv4codegen_p.h>
#include <private/qv4compileddata_p.h>
#include <private/qv4staticvalue_p.h>
#include <private/qv4alloca_p.h>
#include <private/qqmljslexer_p.h>
#include <private/qqmljsast_p.h>
#include <private/qqmlirbuilder_p.h>
#include <QCryptographicHash>
#include <QtEndian>
// Efficient implementation that takes advantage of powers of two.
QT_BEGIN_NAMESPACE
namespace QtPrivate { // Disambiguate from WTF::roundUpToMultipleOf
static inline size_t roundUpToMultipleOf(size_t divisor, size_t x)
{
Q_ASSERT(divisor && !(divisor & (divisor - 1)));
const size_t remainderMask = divisor - 1;
return (x + remainderMask) & ~remainderMask;
}
}
QT_END_NAMESPACE
QV4::Compiler::StringTableGenerator::StringTableGenerator()
{
clear();
}
int QV4::Compiler::StringTableGenerator::registerString(const QString &str)
{
Q_ASSERT(!frozen);
QHash<QString, int>::ConstIterator it = stringToId.constFind(str);
if (it != stringToId.cend())
return *it;
stringToId.insert(str, strings.size());
strings.append(str);
stringDataSize += QV4::CompiledData::String::calculateSize(str);
return strings.size() - 1;
}
int QV4::Compiler::StringTableGenerator::getStringId(const QString &string) const
{
Q_ASSERT(stringToId.contains(string));
return stringToId.value(string);
}
void QV4::Compiler::StringTableGenerator::clear()
{
strings.clear();
stringToId.clear();
stringDataSize = 0;
frozen = false;
}
void QV4::Compiler::StringTableGenerator::initializeFromBackingUnit(const QV4::CompiledData::Unit *unit)
{
clear();
for (uint i = 0; i < unit->stringTableSize; ++i)
registerString(unit->stringAtInternal(i));
backingUnitTableSize = unit->stringTableSize;
stringDataSize = 0;
}
void QV4::Compiler::StringTableGenerator::serialize(CompiledData::Unit *unit)
{
char *dataStart = reinterpret_cast<char *>(unit);
quint32_le *stringTable = reinterpret_cast<quint32_le *>(dataStart + unit->offsetToStringTable);
char *stringData = reinterpret_cast<char *>(stringTable)
+ QtPrivate::roundUpToMultipleOf(8, unit->stringTableSize * sizeof(uint));
for (int i = backingUnitTableSize ; i < strings.size(); ++i) {
const int index = i - backingUnitTableSize;
stringTable[index] = stringData - dataStart;
const QString &qstr = strings.at(i);
QV4::CompiledData::String *s = reinterpret_cast<QV4::CompiledData::String *>(stringData);
Q_ASSERT(reinterpret_cast<uintptr_t>(s) % alignof(QV4::CompiledData::String) == 0);
Q_ASSERT(qstr.size() >= 0);
s->size = qstr.size();
ushort *uc = reinterpret_cast<ushort *>(reinterpret_cast<char *>(s) + sizeof(*s));
qToLittleEndian<ushort>(qstr.constData(), s->size, uc);
uc[s->size] = 0;
stringData += QV4::CompiledData::String::calculateSize(qstr);
}
}
void QV4::Compiler::JSUnitGenerator::generateUnitChecksum(QV4::CompiledData::Unit *unit)
{
#ifndef QT_CRYPTOGRAPHICHASH_ONLY_SHA1
QCryptographicHash hash(QCryptographicHash::Md5);
const int checksummableDataOffset
= offsetof(QV4::CompiledData::Unit, md5Checksum) + sizeof(unit->md5Checksum);
const char *dataPtr = reinterpret_cast<const char *>(unit) + checksummableDataOffset;
hash.addData({dataPtr, qsizetype(unit->unitSize - checksummableDataOffset)});
QByteArray checksum = hash.result();
Q_ASSERT(checksum.size() == sizeof(unit->md5Checksum));
memcpy(unit->md5Checksum, checksum.constData(), sizeof(unit->md5Checksum));
#else
memset(unit->md5Checksum, 0, sizeof(unit->md5Checksum));
#endif
}
QV4::Compiler::JSUnitGenerator::JSUnitGenerator(QV4::Compiler::Module *module)
: module(module)
{
// Make sure the empty string always gets index 0
registerString(QString());
}
int QV4::Compiler::JSUnitGenerator::registerGetterLookup(const QString &name, LookupMode mode)
{
return registerGetterLookup(registerString(name), mode);
}
static QV4::CompiledData::Lookup::Mode lookupMode(QV4::Compiler::JSUnitGenerator::LookupMode mode)
{
return mode == QV4::Compiler::JSUnitGenerator::LookupForCall
? QV4::CompiledData::Lookup::Mode_ForCall
: QV4::CompiledData::Lookup::Mode_ForStorage;
}
int QV4::Compiler::JSUnitGenerator::registerGetterLookup(int nameIndex, LookupMode mode)
{
lookups << CompiledData::Lookup(
CompiledData::Lookup::Type_Getter, lookupMode(mode), nameIndex);
return lookups.size() - 1;
}
int QV4::Compiler::JSUnitGenerator::registerSetterLookup(const QString &name)
{
return registerSetterLookup(registerString(name));
}
int QV4::Compiler::JSUnitGenerator::registerSetterLookup(int nameIndex)
{
lookups << CompiledData::Lookup(
CompiledData::Lookup::Type_Setter,
CompiledData::Lookup::Mode_ForStorage, nameIndex);
return lookups.size() - 1;
}
int QV4::Compiler::JSUnitGenerator::registerGlobalGetterLookup(int nameIndex, LookupMode mode)
{
lookups << CompiledData::Lookup(
CompiledData::Lookup::Type_GlobalGetter, lookupMode(mode), nameIndex);
return lookups.size() - 1;
}
int QV4::Compiler::JSUnitGenerator::registerQmlContextPropertyGetterLookup(
int nameIndex, LookupMode mode)
{
lookups << CompiledData::Lookup(
CompiledData::Lookup::Type_QmlContextPropertyGetter, lookupMode(mode),
nameIndex);
return lookups.size() - 1;
}
int QV4::Compiler::JSUnitGenerator::registerRegExp(QQmlJS::AST::RegExpLiteral *regexp)
{
quint32 flags = 0;
if (regexp->flags & QQmlJS::Lexer::RegExp_Global)
flags |= CompiledData::RegExp::RegExp_Global;
if (regexp->flags & QQmlJS::Lexer::RegExp_IgnoreCase)
flags |= CompiledData::RegExp::RegExp_IgnoreCase;
if (regexp->flags & QQmlJS::Lexer::RegExp_Multiline)
flags |= CompiledData::RegExp::RegExp_Multiline;
if (regexp->flags & QQmlJS::Lexer::RegExp_Unicode)
flags |= CompiledData::RegExp::RegExp_Unicode;
if (regexp->flags & QQmlJS::Lexer::RegExp_Sticky)
flags |= CompiledData::RegExp::RegExp_Sticky;
regexps.append(CompiledData::RegExp(flags, registerString(regexp->pattern.toString())));
return regexps.size() - 1;
}
int QV4::Compiler::JSUnitGenerator::registerConstant(QV4::ReturnedValue v)
{
int idx = constants.indexOf(v);
if (idx >= 0)
return idx;
constants.append(v);
return constants.size() - 1;
}
QV4::ReturnedValue QV4::Compiler::JSUnitGenerator::constant(int idx) const
{
return constants.at(idx);
}
// The JSClass object and its members are stored contiguously in the jsClassData.
// In order to get to the members you have to skip over the JSClass, therefore +1.
static constexpr qsizetype jsClassMembersOffset = 1;
int QV4::Compiler::JSUnitGenerator::registerJSClass(const QStringList &members)
{
// ### re-use existing class definitions.
const int size = CompiledData::JSClass::calculateSize(members.size());
jsClassOffsets.append(jsClassData.size());
const int oldSize = jsClassData.size();
jsClassData.resize(jsClassData.size() + size);
memset(jsClassData.data() + oldSize, 0, size);
CompiledData::JSClass *jsClass = reinterpret_cast<CompiledData::JSClass*>(jsClassData.data() + oldSize);
jsClass->nMembers = members.size();
CompiledData::JSClassMember *member
= reinterpret_cast<CompiledData::JSClassMember*>(jsClass + jsClassMembersOffset);
for (const auto &name : members) {
member->set(registerString(name), false);
++member;
}
return jsClassOffsets.size() - 1;
}
int QV4::Compiler::JSUnitGenerator::jsClassSize(int jsClassId) const
{
const CompiledData::JSClass *jsClass
= reinterpret_cast<const CompiledData::JSClass*>(
jsClassData.data() + jsClassOffsets[jsClassId]);
return jsClass->nMembers;
}
QString QV4::Compiler::JSUnitGenerator::jsClassMember(int jsClassId, int member) const
{
const CompiledData::JSClass *jsClass = reinterpret_cast<const CompiledData::JSClass*>(
jsClassData.data() + jsClassOffsets[jsClassId]);
Q_ASSERT(member >= 0);
Q_ASSERT(uint(member) < jsClass->nMembers);
const CompiledData::JSClassMember *members
= reinterpret_cast<const CompiledData::JSClassMember*>(jsClass + jsClassMembersOffset);
return stringForIndex(members[member].nameOffset());
}
int QV4::Compiler::JSUnitGenerator::registerTranslation(const QV4::CompiledData::TranslationData &translation)
{
translations.append(translation);
return translations.size() - 1;
}
QV4::CompiledData::Unit *QV4::Compiler::JSUnitGenerator::generateUnit(GeneratorOption option)
{
Q_ALLOCA_INIT();
const auto registerTypeStrings = [this](QQmlJS::AST::Type *type) {
if (!type)
return;
if (type->typeArgument) {
registerString(type->typeArgument->toString());
registerString(type->typeId->toString());
}
registerString(type->toString());
};
registerString(module->fileName);
registerString(module->finalUrl);
for (Context *f : std::as_const(module->functions)) {
registerString(f->name);
registerTypeStrings(f->returnType);
for (int i = 0; i < f->arguments.size(); ++i) {
registerString(f->arguments.at(i).id);
if (const QQmlJS::AST::TypeAnnotation *annotation
= f->arguments.at(i).typeAnnotation.data()) {
registerTypeStrings(annotation->type);
}
}
for (int i = 0; i < f->locals.size(); ++i)
registerString(f->locals.at(i));
}
for (Context *c : std::as_const(module->blocks)) {
for (int i = 0; i < c->locals.size(); ++i)
registerString(c->locals.at(i));
}
{
const auto registerExportEntry = [this](const Compiler::ExportEntry &entry) {
registerString(entry.exportName);
registerString(entry.moduleRequest);
registerString(entry.importName);
registerString(entry.localName);
};
std::for_each(module->localExportEntries.constBegin(), module->localExportEntries.constEnd(), registerExportEntry);
std::for_each(module->indirectExportEntries.constBegin(), module->indirectExportEntries.constEnd(), registerExportEntry);
std::for_each(module->starExportEntries.constBegin(), module->starExportEntries.constEnd(), registerExportEntry);
}
{
for (const auto &entry: std::as_const(module->importEntries)) {
registerString(entry.moduleRequest);
registerString(entry.importName);
registerString(entry.localName);
}
for (const QString &request: std::as_const(module->moduleRequests))
registerString(request);
}
Q_ALLOCA_VAR(quint32_le, blockClassAndFunctionOffsets, (module->functions.size() + module->classes.size() + module->templateObjects.size() + module->blocks.size()) * sizeof(quint32_le));
uint jsClassDataOffset = 0;
char *dataPtr;
CompiledData::Unit *unit;
{
QV4::CompiledData::Unit tempHeader = generateHeader(option, blockClassAndFunctionOffsets, &jsClassDataOffset);
dataPtr = reinterpret_cast<char *>(malloc(tempHeader.unitSize));
memset(dataPtr, 0, tempHeader.unitSize);
memcpy(&unit, &dataPtr, sizeof(CompiledData::Unit*));
memcpy(unit, &tempHeader, sizeof(tempHeader));
}
memcpy(dataPtr + unit->offsetToFunctionTable, blockClassAndFunctionOffsets, unit->functionTableSize * sizeof(quint32_le));
memcpy(dataPtr + unit->offsetToClassTable, blockClassAndFunctionOffsets + unit->functionTableSize, unit->classTableSize * sizeof(quint32_le));
memcpy(dataPtr + unit->offsetToTemplateObjectTable, blockClassAndFunctionOffsets + unit->functionTableSize + unit->classTableSize, unit->templateObjectTableSize * sizeof(quint32_le));
memcpy(dataPtr + unit->offsetToBlockTable, blockClassAndFunctionOffsets + unit->functionTableSize + unit->classTableSize + unit->templateObjectTableSize, unit->blockTableSize * sizeof(quint32_le));
for (int i = 0; i < module->functions.size(); ++i) {
Context *function = module->functions.at(i);
if (function == module->rootContext)
unit->indexOfRootFunction = i;
writeFunction(dataPtr + blockClassAndFunctionOffsets[i], function);
}
for (int i = 0; i < module->classes.size(); ++i) {
const Class &c = module->classes.at(i);
writeClass(dataPtr + blockClassAndFunctionOffsets[i + module->functions.size()], c);
}
for (int i = 0; i < module->templateObjects.size(); ++i) {
const TemplateObject &t = module->templateObjects.at(i);
writeTemplateObject(dataPtr + blockClassAndFunctionOffsets[i + module->functions.size() + module->classes.size()], t);
}
for (int i = 0; i < module->blocks.size(); ++i) {
Context *block = module->blocks.at(i);
writeBlock(dataPtr + blockClassAndFunctionOffsets[i + module->classes.size() + module->templateObjects.size() + module->functions.size()], block);
}
CompiledData::Lookup *lookupsToWrite = reinterpret_cast<CompiledData::Lookup*>(dataPtr + unit->offsetToLookupTable);
for (const CompiledData::Lookup &l : std::as_const(lookups))
*lookupsToWrite++ = l;
CompiledData::RegExp *regexpTable = reinterpret_cast<CompiledData::RegExp *>(dataPtr + unit->offsetToRegexpTable);
if (regexps.size())
memcpy(regexpTable, regexps.constData(), regexps.size() * sizeof(*regexpTable));
#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
ReturnedValue *constantTable = reinterpret_cast<ReturnedValue *>(dataPtr + unit->offsetToConstantTable);
if (constants.size())
memcpy(constantTable, constants.constData(), constants.size() * sizeof(ReturnedValue));
#else
quint64_le *constantTable = reinterpret_cast<quint64_le *>(dataPtr + unit->offsetToConstantTable);
for (int i = 0; i < constants.count(); ++i)
constantTable[i] = constants.at(i);
#endif
{
if (jsClassData.size())
memcpy(dataPtr + jsClassDataOffset, jsClassData.constData(), jsClassData.size());
// write js classes and js class lookup table
quint32_le *jsClassOffsetTable = reinterpret_cast<quint32_le *>(dataPtr + unit->offsetToJSClassTable);
for (int i = 0; i < jsClassOffsets.size(); ++i)
jsClassOffsetTable[i] = jsClassDataOffset + jsClassOffsets.at(i);
}
if (translations.size()) {
memcpy(dataPtr + unit->offsetToTranslationTable, translations.constData(), translations.size() * sizeof(CompiledData::TranslationData));
}
{
const auto populateExportEntryTable = [this, dataPtr](const QList<Compiler::ExportEntry> &table, quint32_le offset) {
CompiledData::ExportEntry *entryToWrite = reinterpret_cast<CompiledData::ExportEntry *>(dataPtr + offset);
for (const Compiler::ExportEntry &entry: table) {
entryToWrite->exportName = getStringId(entry.exportName);
entryToWrite->moduleRequest = getStringId(entry.moduleRequest);
entryToWrite->importName = getStringId(entry.importName);
entryToWrite->localName = getStringId(entry.localName);
entryToWrite->location = entry.location;
entryToWrite++;
}
};
populateExportEntryTable(module->localExportEntries, unit->offsetToLocalExportEntryTable);
populateExportEntryTable(module->indirectExportEntries, unit->offsetToIndirectExportEntryTable);
populateExportEntryTable(module->starExportEntries, unit->offsetToStarExportEntryTable);
}
{
CompiledData::ImportEntry *entryToWrite = reinterpret_cast<CompiledData::ImportEntry *>(dataPtr + unit->offsetToImportEntryTable);
for (const Compiler::ImportEntry &entry: std::as_const(module->importEntries)) {
entryToWrite->moduleRequest = getStringId(entry.moduleRequest);
entryToWrite->importName = getStringId(entry.importName);
entryToWrite->localName = getStringId(entry.localName);
entryToWrite->location = entry.location;
entryToWrite++;
}
}
{
quint32_le *moduleRequestEntryToWrite = reinterpret_cast<quint32_le *>(dataPtr + unit->offsetToModuleRequestTable);
for (const QString &moduleRequest: std::as_const(module->moduleRequests)) {
*moduleRequestEntryToWrite = getStringId(moduleRequest);
moduleRequestEntryToWrite++;
}
}
// write strings and string table
if (option == GenerateWithStringTable)
stringTable.serialize(unit);
generateUnitChecksum(unit);
return unit;
}
void QV4::Compiler::JSUnitGenerator::writeFunction(char *f, QV4::Compiler::Context *irFunction) const
{
QV4::CompiledData::Function *function = (QV4::CompiledData::Function *)f;
quint32 currentOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(8, sizeof(*function)));
function->nameIndex = getStringId(irFunction->name);
function->flags = 0;
if (irFunction->isStrict)
function->flags |= CompiledData::Function::IsStrict;
if (irFunction->isArrowFunction)
function->flags |= CompiledData::Function::IsArrowFunction;
if (irFunction->isGenerator)
function->flags |= CompiledData::Function::IsGenerator;
if (irFunction->returnsClosure)
function->flags |= CompiledData::Function::IsClosureWrapper;
if (!irFunction->returnsClosure
|| (irFunction->usesArgumentsObject == Context::UsesArgumentsObject::Used)
|| irFunction->innerFunctionAccessesThis
|| irFunction->innerFunctionAccessesNewTarget) {
// If the inner function does things with this and new.target we need to do some work in
// the outer function. Then we shouldn't directly access the nested function.
function->nestedFunctionIndex = std::numeric_limits<uint32_t>::max();
} else {
// Otherwise we can directly use the nested function.
function->nestedFunctionIndex
= quint32(module->functions.indexOf(irFunction->nestedContexts.first()));
}
function->length = irFunction->formals ? irFunction->formals->length() : 0;
function->nFormals = irFunction->arguments.size();
function->formalsOffset = currentOffset;
currentOffset += function->nFormals * sizeof(CompiledData::Parameter);
const auto idGenerator = [this](const QString &str) { return getStringId(str); };
QmlIR::Parameter::initType(&function->returnType, idGenerator, irFunction->returnType);
function->sizeOfLocalTemporalDeadZone = irFunction->sizeOfLocalTemporalDeadZone;
function->sizeOfRegisterTemporalDeadZone = irFunction->sizeOfRegisterTemporalDeadZone;
function->firstTemporalDeadZoneRegister = irFunction->firstTemporalDeadZoneRegister;
function->nLocals = irFunction->locals.size();
function->localsOffset = currentOffset;
currentOffset += function->nLocals * sizeof(quint32);
function->nLineAndStatementNumbers
= irFunction->lineAndStatementNumberMapping.size();
Q_ASSERT(function->lineAndStatementNumberOffset() == currentOffset);
currentOffset += function->nLineAndStatementNumbers
* sizeof(CompiledData::CodeOffsetToLineAndStatement);
function->nRegisters = irFunction->registerCountInFunction;
if (!irFunction->labelInfo.empty()) {
function->nLabelInfos = quint32(irFunction->labelInfo.size());
Q_ASSERT(function->labelInfosOffset() == currentOffset);
currentOffset += function->nLabelInfos * sizeof(quint32);
}
function->location.set(irFunction->line, irFunction->column);
function->codeOffset = currentOffset;
function->codeSize = irFunction->code.size();
// write formals
CompiledData::Parameter *formals = (CompiledData::Parameter *)(f + function->formalsOffset);
for (int i = 0; i < irFunction->arguments.size(); ++i) {
auto *formal = &formals[i];
formal->nameIndex = getStringId(irFunction->arguments.at(i).id);
if (QQmlJS::AST::TypeAnnotation *annotation = irFunction->arguments.at(i).typeAnnotation.data())
QmlIR::Parameter::initType(&formal->type, idGenerator, annotation->type);
}
// write locals
quint32_le *locals = (quint32_le *)(f + function->localsOffset);
for (int i = 0; i < irFunction->locals.size(); ++i)
locals[i] = getStringId(irFunction->locals.at(i));
// write line and statement numbers
memcpy(f + function->lineAndStatementNumberOffset(),
irFunction->lineAndStatementNumberMapping.constData(),
irFunction->lineAndStatementNumberMapping.size()
* sizeof(CompiledData::CodeOffsetToLineAndStatement));
quint32_le *labels = (quint32_le *)(f + function->labelInfosOffset());
for (unsigned u : irFunction->labelInfo) {
*labels++ = u;
}
// write byte code
memcpy(f + function->codeOffset, irFunction->code.constData(), irFunction->code.size());
}
static_assert(int(QV4::Compiler::Class::Method::Regular) == int(QV4::CompiledData::Method::Regular), "Incompatible layout");
static_assert(int(QV4::Compiler::Class::Method::Getter) == int(QV4::CompiledData::Method::Getter), "Incompatible layout");
static_assert(int(QV4::Compiler::Class::Method::Setter) == int(QV4::CompiledData::Method::Setter), "Incompatible layout");
void QV4::Compiler::JSUnitGenerator::writeClass(char *b, const QV4::Compiler::Class &c)
{
QV4::CompiledData::Class *cls = reinterpret_cast<QV4::CompiledData::Class *>(b);
quint32 currentOffset = sizeof(QV4::CompiledData::Class);
QList<Class::Method> allMethods = c.staticMethods;
allMethods += c.methods;
cls->constructorFunction = c.constructorIndex;
cls->nameIndex = c.nameIndex;
cls->nMethods = c.methods.size();
cls->nStaticMethods = c.staticMethods.size();
cls->methodTableOffset = currentOffset;
CompiledData::Method *method = reinterpret_cast<CompiledData::Method *>(b + currentOffset);
// write methods
for (int i = 0; i < allMethods.size(); ++i) {
method->name = allMethods.at(i).nameIndex;
method->type = allMethods.at(i).type;
method->function = allMethods.at(i).functionIndex;
++method;
}
static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_BYTECODE");
if (showCode) {
qDebug() << "=== Class" << stringForIndex(cls->nameIndex) << "static methods"
<< cls->nStaticMethods << "methods" << cls->nMethods;
qDebug() << " constructor:" << cls->constructorFunction;
for (uint i = 0; i < cls->nStaticMethods + cls->nMethods; ++i) {
QDebug output = qDebug().nospace();
output << " " << i << ": ";
if (i < cls->nStaticMethods)
output << "static ";
switch (cls->methodTable()[i].type) {
case CompiledData::Method::Getter:
output << "get "; break;
case CompiledData::Method::Setter:
output << "set "; break;
default:
break;
}
output << stringForIndex(cls->methodTable()[i].name) << " "
<< cls->methodTable()[i].function;
}
qDebug().space();
}
}
void QV4::Compiler::JSUnitGenerator::writeTemplateObject(char *b, const QV4::Compiler::TemplateObject &t)
{
QV4::CompiledData::TemplateObject *tmpl = reinterpret_cast<QV4::CompiledData::TemplateObject *>(b);
tmpl->size = t.strings.size();
quint32 currentOffset = sizeof(QV4::CompiledData::TemplateObject);
quint32_le *strings = reinterpret_cast<quint32_le *>(b + currentOffset);
// write methods
for (int i = 0; i < t.strings.size(); ++i)
strings[i] = t.strings.at(i);
strings += t.strings.size();
for (int i = 0; i < t.rawStrings.size(); ++i)
strings[i] = t.rawStrings.at(i);
static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_BYTECODE");
if (showCode) {
qDebug() << "=== TemplateObject size" << tmpl->size;
for (uint i = 0; i < tmpl->size; ++i) {
qDebug() << " " << i << stringForIndex(tmpl->stringIndexAt(i));
qDebug() << " raw: " << stringForIndex(tmpl->rawStringIndexAt(i));
}
qDebug();
}
}
void QV4::Compiler::JSUnitGenerator::writeBlock(char *b, QV4::Compiler::Context *irBlock) const
{
QV4::CompiledData::Block *block = reinterpret_cast<QV4::CompiledData::Block *>(b);
quint32 currentOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(8, sizeof(*block)));
block->sizeOfLocalTemporalDeadZone = irBlock->sizeOfLocalTemporalDeadZone;
block->nLocals = irBlock->locals.size();
block->localsOffset = currentOffset;
currentOffset += block->nLocals * sizeof(quint32);
// write locals
quint32_le *locals = (quint32_le *)(b + block->localsOffset);
for (int i = 0; i < irBlock->locals.size(); ++i)
locals[i] = getStringId(irBlock->locals.at(i));
static const bool showCode = qEnvironmentVariableIsSet("QV4_SHOW_BYTECODE");
if (showCode) {
qDebug() << "=== Variables for block" << irBlock->blockIndex;
for (int i = 0; i < irBlock->locals.size(); ++i)
qDebug() << " " << i << ":" << locals[i];
qDebug();
}
}
QV4::CompiledData::Unit QV4::Compiler::JSUnitGenerator::generateHeader(QV4::Compiler::JSUnitGenerator::GeneratorOption option, quint32_le *blockAndFunctionOffsets, uint *jsClassDataOffset)
{
CompiledData::Unit unit;
memset(&unit, 0, sizeof(unit));
memcpy(unit.magic, CompiledData::magic_str, sizeof(unit.magic));
unit.flags = QV4::CompiledData::Unit::IsJavascript;
unit.flags |= module->unitFlags;
unit.version = QV4_DATA_STRUCTURE_VERSION;
memset(unit.md5Checksum, 0, sizeof(unit.md5Checksum));
memset(unit.dependencyMD5Checksum, 0, sizeof(unit.dependencyMD5Checksum));
quint32 nextOffset = sizeof(CompiledData::Unit);
unit.functionTableSize = module->functions.size();
unit.offsetToFunctionTable = nextOffset;
nextOffset += unit.functionTableSize * sizeof(uint);
unit.classTableSize = module->classes.size();
unit.offsetToClassTable = nextOffset;
nextOffset += unit.classTableSize * sizeof(uint);
unit.templateObjectTableSize = module->templateObjects.size();
unit.offsetToTemplateObjectTable = nextOffset;
nextOffset += unit.templateObjectTableSize * sizeof(uint);
unit.blockTableSize = module->blocks.size();
unit.offsetToBlockTable = nextOffset;
nextOffset += unit.blockTableSize * sizeof(uint);
unit.lookupTableSize = lookups.size();
unit.offsetToLookupTable = nextOffset;
nextOffset += unit.lookupTableSize * sizeof(CompiledData::Lookup);
unit.regexpTableSize = regexps.size();
unit.offsetToRegexpTable = nextOffset;
nextOffset += unit.regexpTableSize * sizeof(CompiledData::RegExp);
unit.constantTableSize = constants.size();
// Ensure we load constants from well-aligned addresses into for example SSE registers.
nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(16, nextOffset));
unit.offsetToConstantTable = nextOffset;
nextOffset += unit.constantTableSize * sizeof(ReturnedValue);
unit.jsClassTableSize = jsClassOffsets.size();
unit.offsetToJSClassTable = nextOffset;
nextOffset += unit.jsClassTableSize * sizeof(uint);
*jsClassDataOffset = nextOffset;
nextOffset += jsClassData.size();
nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(8, nextOffset));
unit.translationTableSize = translations.size();
unit.offsetToTranslationTable = nextOffset;
nextOffset += unit.translationTableSize * sizeof(CompiledData::TranslationData);
if (unit.translationTableSize != 0) {
constexpr auto spaceForTranslationContextId = sizeof(quint32_le);
nextOffset += spaceForTranslationContextId;
}
nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(8, nextOffset));
const auto reserveExportTable = [&nextOffset](int count, quint32_le *tableSizePtr, quint32_le *offsetPtr) {
*tableSizePtr = count;
*offsetPtr = nextOffset;
nextOffset += count * sizeof(CompiledData::ExportEntry);
nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(8, nextOffset));
};
reserveExportTable(module->localExportEntries.size(), &unit.localExportEntryTableSize, &unit.offsetToLocalExportEntryTable);
reserveExportTable(module->indirectExportEntries.size(), &unit.indirectExportEntryTableSize, &unit.offsetToIndirectExportEntryTable);
reserveExportTable(module->starExportEntries.size(), &unit.starExportEntryTableSize, &unit.offsetToStarExportEntryTable);
unit.importEntryTableSize = module->importEntries.size();
unit.offsetToImportEntryTable = nextOffset;
nextOffset += unit.importEntryTableSize * sizeof(CompiledData::ImportEntry);
nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(8, nextOffset));
unit.moduleRequestTableSize = module->moduleRequests.size();
unit.offsetToModuleRequestTable = nextOffset;
nextOffset += unit.moduleRequestTableSize * sizeof(uint);
nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(8, nextOffset));
quint32 functionSize = 0;
for (int i = 0; i < module->functions.size(); ++i) {
Context *f = module->functions.at(i);
blockAndFunctionOffsets[i] = nextOffset;
quint32 size = QV4::CompiledData::Function::calculateSize(
f->arguments.size(), f->locals.size(), f->lineAndStatementNumberMapping.size(),
int(f->labelInfo.size()), f->code.size());
functionSize += size - f->code.size();
nextOffset += size;
}
blockAndFunctionOffsets += module->functions.size();
for (int i = 0; i < module->classes.size(); ++i) {
const Class &c = module->classes.at(i);
blockAndFunctionOffsets[i] = nextOffset;
nextOffset += QV4::CompiledData::Class::calculateSize(c.staticMethods.size(), c.methods.size());
}
blockAndFunctionOffsets += module->classes.size();
for (int i = 0; i < module->templateObjects.size(); ++i) {
const TemplateObject &t = module->templateObjects.at(i);
blockAndFunctionOffsets[i] = nextOffset;
nextOffset += QV4::CompiledData::TemplateObject::calculateSize(t.strings.size());
}
blockAndFunctionOffsets += module->templateObjects.size();
for (int i = 0; i < module->blocks.size(); ++i) {
Context *c = module->blocks.at(i);
blockAndFunctionOffsets[i] = nextOffset;
nextOffset += QV4::CompiledData::Block::calculateSize(c->locals.size());
}
if (option == GenerateWithStringTable) {
unit.stringTableSize = stringTable.stringCount();
nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(8, nextOffset));
unit.offsetToStringTable = nextOffset;
nextOffset += stringTable.sizeOfTableAndData();
} else {
unit.stringTableSize = 0;
unit.offsetToStringTable = 0;
}
unit.indexOfRootFunction = -1;
unit.sourceFileIndex = getStringId(module->fileName);
unit.finalUrlIndex = getStringId(module->finalUrl);
unit.sourceTimeStamp = module->sourceTimeStamp.isValid() ? module->sourceTimeStamp.toMSecsSinceEpoch() : 0;
unit.offsetToQmlUnit = 0;
unit.unitSize = nextOffset;
static const bool showStats = qEnvironmentVariableIsSet("QML_SHOW_UNIT_STATS");
if (showStats) {
qDebug() << "Generated JS unit that is" << unit.unitSize << "bytes contains:";
qDebug() << " " << functionSize << "bytes for non-code function data for" << unit.functionTableSize << "functions";
qDebug() << " " << translations.size() * sizeof(CompiledData::TranslationData) << "bytes for" << translations.size() << "translations";
}
return unit;
}