1// Copyright (C) 2016 The Qt Company Ltd.
2// Copyright (C) 2018 Intel Corporation.
3// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
4
5#include <qv4compiler_p.h>
6#include <qv4codegen_p.h>
7#include <private/qv4compileddata_p.h>
8#include <private/qv4staticvalue_p.h>
9#include <private/qv4alloca_p.h>
10#include <private/qqmljslexer_p.h>
11#include <private/qqmljsast_p.h>
12#include <private/qml_compile_hash_p.h>
13#include <private/qqmlirbuilder_p.h>
14#include <QCryptographicHash>
15#include <QtEndian>
16
17// Efficient implementation that takes advantage of powers of two.
18
19QT_BEGIN_NAMESPACE
20namespace QtPrivate { // Disambiguate from WTF::roundUpToMultipleOf
21static inline size_t roundUpToMultipleOf(size_t divisor, size_t x)
22{
23 Q_ASSERT(divisor && !(divisor & (divisor - 1)));
24 const size_t remainderMask = divisor - 1;
25 return (x + remainderMask) & ~remainderMask;
26}
27}
28QT_END_NAMESPACE
29
30QV4::Compiler::StringTableGenerator::StringTableGenerator()
31{
32 clear();
33}
34
35int QV4::Compiler::StringTableGenerator::registerString(const QString &str)
36{
37 Q_ASSERT(!frozen);
38 QHash<QString, int>::ConstIterator it = stringToId.constFind(key: str);
39 if (it != stringToId.cend())
40 return *it;
41 stringToId.insert(key: str, value: strings.size());
42 strings.append(t: str);
43 stringDataSize += QV4::CompiledData::String::calculateSize(str);
44 return strings.size() - 1;
45}
46
47int QV4::Compiler::StringTableGenerator::getStringId(const QString &string) const
48{
49 Q_ASSERT(stringToId.contains(string));
50 return stringToId.value(key: string);
51}
52
53void QV4::Compiler::StringTableGenerator::clear()
54{
55 strings.clear();
56 stringToId.clear();
57 stringDataSize = 0;
58 frozen = false;
59}
60
61void QV4::Compiler::StringTableGenerator::initializeFromBackingUnit(const QV4::CompiledData::Unit *unit)
62{
63 clear();
64 for (uint i = 0; i < unit->stringTableSize; ++i)
65 registerString(str: unit->stringAtInternal(idx: i));
66 backingUnitTableSize = unit->stringTableSize;
67 stringDataSize = 0;
68}
69
70void QV4::Compiler::StringTableGenerator::serialize(CompiledData::Unit *unit)
71{
72 char *dataStart = reinterpret_cast<char *>(unit);
73 quint32_le *stringTable = reinterpret_cast<quint32_le *>(dataStart + unit->offsetToStringTable);
74 char *stringData = reinterpret_cast<char *>(stringTable)
75 + QtPrivate::roundUpToMultipleOf(divisor: 8, x: unit->stringTableSize * sizeof(uint));
76 for (int i = backingUnitTableSize ; i < strings.size(); ++i) {
77 const int index = i - backingUnitTableSize;
78 stringTable[index] = stringData - dataStart;
79 const QString &qstr = strings.at(i);
80
81 QV4::CompiledData::String *s = reinterpret_cast<QV4::CompiledData::String *>(stringData);
82 Q_ASSERT(reinterpret_cast<uintptr_t>(s) % alignof(QV4::CompiledData::String) == 0);
83 Q_ASSERT(qstr.size() >= 0);
84 s->size = qstr.size();
85
86 ushort *uc = reinterpret_cast<ushort *>(reinterpret_cast<char *>(s) + sizeof(*s));
87 qToLittleEndian<ushort>(source: qstr.constData(), count: s->size, dest: uc);
88 uc[s->size] = 0;
89
90 stringData += QV4::CompiledData::String::calculateSize(str: qstr);
91 }
92}
93
94void QV4::Compiler::JSUnitGenerator::generateUnitChecksum(QV4::CompiledData::Unit *unit)
95{
96#ifndef QT_CRYPTOGRAPHICHASH_ONLY_SHA1
97 QCryptographicHash hash(QCryptographicHash::Md5);
98
99 const int checksummableDataOffset
100 = offsetof(QV4::CompiledData::Unit, md5Checksum) + sizeof(unit->md5Checksum);
101
102 const char *dataPtr = reinterpret_cast<const char *>(unit) + checksummableDataOffset;
103 hash.addData(data: {dataPtr, qsizetype(unit->unitSize - checksummableDataOffset)});
104
105 QByteArray checksum = hash.result();
106 Q_ASSERT(checksum.size() == sizeof(unit->md5Checksum));
107 memcpy(dest: unit->md5Checksum, src: checksum.constData(), n: sizeof(unit->md5Checksum));
108#else
109 memset(unit->md5Checksum, 0, sizeof(unit->md5Checksum));
110#endif
111}
112
113QV4::Compiler::JSUnitGenerator::JSUnitGenerator(QV4::Compiler::Module *module)
114 : module(module)
115{
116 // Make sure the empty string always gets index 0
117 registerString(str: QString());
118}
119
120int QV4::Compiler::JSUnitGenerator::registerGetterLookup(const QString &name, LookupMode mode)
121{
122 return registerGetterLookup(nameIndex: registerString(str: name), mode);
123}
124
125static QV4::CompiledData::Lookup::Mode lookupMode(QV4::Compiler::JSUnitGenerator::LookupMode mode)
126{
127 return mode == QV4::Compiler::JSUnitGenerator::LookupForCall
128 ? QV4::CompiledData::Lookup::Mode_ForCall
129 : QV4::CompiledData::Lookup::Mode_ForStorage;
130}
131
132int QV4::Compiler::JSUnitGenerator::registerGetterLookup(int nameIndex, LookupMode mode)
133{
134 lookups << CompiledData::Lookup(
135 CompiledData::Lookup::Type_Getter, lookupMode(mode), nameIndex);
136 return lookups.size() - 1;
137}
138
139int QV4::Compiler::JSUnitGenerator::registerSetterLookup(const QString &name)
140{
141 return registerSetterLookup(nameIndex: registerString(str: name));
142}
143
144int QV4::Compiler::JSUnitGenerator::registerSetterLookup(int nameIndex)
145{
146 lookups << CompiledData::Lookup(
147 CompiledData::Lookup::Type_Setter,
148 CompiledData::Lookup::Mode_ForStorage, nameIndex);
149 return lookups.size() - 1;
150}
151
152int QV4::Compiler::JSUnitGenerator::registerGlobalGetterLookup(int nameIndex, LookupMode mode)
153{
154 lookups << CompiledData::Lookup(
155 CompiledData::Lookup::Type_GlobalGetter, lookupMode(mode), nameIndex);
156 return lookups.size() - 1;
157}
158
159int QV4::Compiler::JSUnitGenerator::registerQmlContextPropertyGetterLookup(
160 int nameIndex, LookupMode mode)
161{
162 lookups << CompiledData::Lookup(
163 CompiledData::Lookup::Type_QmlContextPropertyGetter, lookupMode(mode),
164 nameIndex);
165 return lookups.size() - 1;
166}
167
168int QV4::Compiler::JSUnitGenerator::registerRegExp(QQmlJS::AST::RegExpLiteral *regexp)
169{
170 quint32 flags = 0;
171 if (regexp->flags & QQmlJS::Lexer::RegExp_Global)
172 flags |= CompiledData::RegExp::RegExp_Global;
173 if (regexp->flags & QQmlJS::Lexer::RegExp_IgnoreCase)
174 flags |= CompiledData::RegExp::RegExp_IgnoreCase;
175 if (regexp->flags & QQmlJS::Lexer::RegExp_Multiline)
176 flags |= CompiledData::RegExp::RegExp_Multiline;
177 if (regexp->flags & QQmlJS::Lexer::RegExp_Unicode)
178 flags |= CompiledData::RegExp::RegExp_Unicode;
179 if (regexp->flags & QQmlJS::Lexer::RegExp_Sticky)
180 flags |= CompiledData::RegExp::RegExp_Sticky;
181
182 regexps.append(t: CompiledData::RegExp(flags, registerString(str: regexp->pattern.toString())));
183 return regexps.size() - 1;
184}
185
186int QV4::Compiler::JSUnitGenerator::registerConstant(QV4::ReturnedValue v)
187{
188 int idx = constants.indexOf(t: v);
189 if (idx >= 0)
190 return idx;
191 constants.append(t: v);
192 return constants.size() - 1;
193}
194
195QV4::ReturnedValue QV4::Compiler::JSUnitGenerator::constant(int idx) const
196{
197 return constants.at(i: idx);
198}
199
200// The JSClass object and its members are stored contiguously in the jsClassData.
201// In order to get to the members you have to skip over the JSClass, therefore +1.
202static constexpr qsizetype jsClassMembersOffset = 1;
203
204int QV4::Compiler::JSUnitGenerator::registerJSClass(const QStringList &members)
205{
206 // ### re-use existing class definitions.
207
208 const int size = CompiledData::JSClass::calculateSize(nMembers: members.size());
209 jsClassOffsets.append(t: jsClassData.size());
210 const int oldSize = jsClassData.size();
211 jsClassData.resize(size: jsClassData.size() + size);
212 memset(s: jsClassData.data() + oldSize, c: 0, n: size);
213
214 CompiledData::JSClass *jsClass = reinterpret_cast<CompiledData::JSClass*>(jsClassData.data() + oldSize);
215 jsClass->nMembers = members.size();
216 CompiledData::JSClassMember *member
217 = reinterpret_cast<CompiledData::JSClassMember*>(jsClass + jsClassMembersOffset);
218
219 for (const auto &name : members) {
220 member->set(nameOffset: registerString(str: name), isAccessor: false);
221 ++member;
222 }
223
224 return jsClassOffsets.size() - 1;
225}
226
227int QV4::Compiler::JSUnitGenerator::jsClassSize(int jsClassId) const
228{
229 const CompiledData::JSClass *jsClass
230 = reinterpret_cast<const CompiledData::JSClass*>(
231 jsClassData.data() + jsClassOffsets[jsClassId]);
232 return jsClass->nMembers;
233}
234
235QString QV4::Compiler::JSUnitGenerator::jsClassMember(int jsClassId, int member) const
236{
237 const CompiledData::JSClass *jsClass = reinterpret_cast<const CompiledData::JSClass*>(
238 jsClassData.data() + jsClassOffsets[jsClassId]);
239 Q_ASSERT(member >= 0);
240 Q_ASSERT(uint(member) < jsClass->nMembers);
241 const CompiledData::JSClassMember *members
242 = reinterpret_cast<const CompiledData::JSClassMember*>(jsClass + jsClassMembersOffset);
243 return stringForIndex(index: members[member].nameOffset());
244}
245
246int QV4::Compiler::JSUnitGenerator::registerTranslation(const QV4::CompiledData::TranslationData &translation)
247{
248 translations.append(t: translation);
249 return translations.size() - 1;
250}
251
252QV4::CompiledData::Unit *QV4::Compiler::JSUnitGenerator::generateUnit(GeneratorOption option)
253{
254 const auto registerTypeStrings = [this](QQmlJS::AST::Type *type) {
255 if (!type)
256 return;
257
258 if (type->typeArgument) {
259 registerString(str: type->typeArgument->toString());
260 registerString(str: type->typeId->toString());
261 }
262 registerString(str: type->toString());
263 };
264
265 registerString(str: module->fileName);
266 registerString(str: module->finalUrl);
267 for (Context *f : std::as_const(t&: module->functions)) {
268 registerString(str: f->name);
269 registerTypeStrings(f->returnType);
270 for (int i = 0; i < f->arguments.size(); ++i) {
271 registerString(str: f->arguments.at(i).id);
272 if (const QQmlJS::AST::TypeAnnotation *annotation
273 = f->arguments.at(i).typeAnnotation.data()) {
274 registerTypeStrings(annotation->type);
275 }
276 }
277 for (int i = 0; i < f->locals.size(); ++i)
278 registerString(str: f->locals.at(i));
279 }
280 for (Context *c : std::as_const(t&: module->blocks)) {
281 for (int i = 0; i < c->locals.size(); ++i)
282 registerString(str: c->locals.at(i));
283 }
284 {
285 const auto registerExportEntry = [this](const Compiler::ExportEntry &entry) {
286 registerString(str: entry.exportName);
287 registerString(str: entry.moduleRequest);
288 registerString(str: entry.importName);
289 registerString(str: entry.localName);
290 };
291 std::for_each(first: module->localExportEntries.constBegin(), last: module->localExportEntries.constEnd(), f: registerExportEntry);
292 std::for_each(first: module->indirectExportEntries.constBegin(), last: module->indirectExportEntries.constEnd(), f: registerExportEntry);
293 std::for_each(first: module->starExportEntries.constBegin(), last: module->starExportEntries.constEnd(), f: registerExportEntry);
294 }
295 {
296 for (const auto &entry: module->importEntries) {
297 registerString(str: entry.moduleRequest);
298 registerString(str: entry.importName);
299 registerString(str: entry.localName);
300 }
301
302 for (const QString &request: module->moduleRequests)
303 registerString(str: request);
304 }
305
306 Q_ALLOCA_VAR(quint32_le, blockClassAndFunctionOffsets, (module->functions.size() + module->classes.size() + module->templateObjects.size() + module->blocks.size()) * sizeof(quint32_le));
307 uint jsClassDataOffset = 0;
308
309 char *dataPtr;
310 CompiledData::Unit *unit;
311 {
312 QV4::CompiledData::Unit tempHeader = generateHeader(option, functionOffsets: blockClassAndFunctionOffsets, jsClassDataOffset: &jsClassDataOffset);
313 dataPtr = reinterpret_cast<char *>(malloc(size: tempHeader.unitSize));
314 memset(s: dataPtr, c: 0, n: tempHeader.unitSize);
315 memcpy(dest: &unit, src: &dataPtr, n: sizeof(CompiledData::Unit*));
316 memcpy(dest: unit, src: &tempHeader, n: sizeof(tempHeader));
317 }
318
319 memcpy(dest: dataPtr + unit->offsetToFunctionTable, src: blockClassAndFunctionOffsets, n: unit->functionTableSize * sizeof(quint32_le));
320 memcpy(dest: dataPtr + unit->offsetToClassTable, src: blockClassAndFunctionOffsets + unit->functionTableSize, n: unit->classTableSize * sizeof(quint32_le));
321 memcpy(dest: dataPtr + unit->offsetToTemplateObjectTable, src: blockClassAndFunctionOffsets + unit->functionTableSize + unit->classTableSize, n: unit->templateObjectTableSize * sizeof(quint32_le));
322 memcpy(dest: dataPtr + unit->offsetToBlockTable, src: blockClassAndFunctionOffsets + unit->functionTableSize + unit->classTableSize + unit->templateObjectTableSize, n: unit->blockTableSize * sizeof(quint32_le));
323
324 for (int i = 0; i < module->functions.size(); ++i) {
325 Context *function = module->functions.at(i);
326 if (function == module->rootContext)
327 unit->indexOfRootFunction = i;
328
329 writeFunction(f: dataPtr + blockClassAndFunctionOffsets[i], irFunction: function);
330 }
331
332 for (int i = 0; i < module->classes.size(); ++i) {
333 const Class &c = module->classes.at(i);
334
335 writeClass(f: dataPtr + blockClassAndFunctionOffsets[i + module->functions.size()], c);
336 }
337
338 for (int i = 0; i < module->templateObjects.size(); ++i) {
339 const TemplateObject &t = module->templateObjects.at(i);
340
341 writeTemplateObject(f: dataPtr + blockClassAndFunctionOffsets[i + module->functions.size() + module->classes.size()], o: t);
342 }
343
344 for (int i = 0; i < module->blocks.size(); ++i) {
345 Context *block = module->blocks.at(i);
346
347 writeBlock(f: dataPtr + blockClassAndFunctionOffsets[i + module->classes.size() + module->templateObjects.size() + module->functions.size()], irBlock: block);
348 }
349
350 CompiledData::Lookup *lookupsToWrite = reinterpret_cast<CompiledData::Lookup*>(dataPtr + unit->offsetToLookupTable);
351 for (const CompiledData::Lookup &l : std::as_const(t&: lookups))
352 *lookupsToWrite++ = l;
353
354 CompiledData::RegExp *regexpTable = reinterpret_cast<CompiledData::RegExp *>(dataPtr + unit->offsetToRegexpTable);
355 if (regexps.size())
356 memcpy(dest: regexpTable, src: regexps.constData(), n: regexps.size() * sizeof(*regexpTable));
357
358#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
359 ReturnedValue *constantTable = reinterpret_cast<ReturnedValue *>(dataPtr + unit->offsetToConstantTable);
360 if (constants.size())
361 memcpy(dest: constantTable, src: constants.constData(), n: constants.size() * sizeof(ReturnedValue));
362#else
363 quint64_le *constantTable = reinterpret_cast<quint64_le *>(dataPtr + unit->offsetToConstantTable);
364 for (int i = 0; i < constants.count(); ++i)
365 constantTable[i] = constants.at(i);
366#endif
367
368 {
369 if (jsClassData.size())
370 memcpy(dest: dataPtr + jsClassDataOffset, src: jsClassData.constData(), n: jsClassData.size());
371
372 // write js classes and js class lookup table
373 quint32_le *jsClassOffsetTable = reinterpret_cast<quint32_le *>(dataPtr + unit->offsetToJSClassTable);
374 for (int i = 0; i < jsClassOffsets.size(); ++i)
375 jsClassOffsetTable[i] = jsClassDataOffset + jsClassOffsets.at(i);
376 }
377
378 if (translations.size()) {
379 memcpy(dest: dataPtr + unit->offsetToTranslationTable, src: translations.constData(), n: translations.size() * sizeof(CompiledData::TranslationData));
380 }
381
382 {
383 const auto populateExportEntryTable = [this, dataPtr](const QVector<Compiler::ExportEntry> &table, quint32_le offset) {
384 CompiledData::ExportEntry *entryToWrite = reinterpret_cast<CompiledData::ExportEntry *>(dataPtr + offset);
385 for (const Compiler::ExportEntry &entry: table) {
386 entryToWrite->exportName = getStringId(string: entry.exportName);
387 entryToWrite->moduleRequest = getStringId(string: entry.moduleRequest);
388 entryToWrite->importName = getStringId(string: entry.importName);
389 entryToWrite->localName = getStringId(string: entry.localName);
390 entryToWrite->location = entry.location;
391 entryToWrite++;
392 }
393 };
394 populateExportEntryTable(module->localExportEntries, unit->offsetToLocalExportEntryTable);
395 populateExportEntryTable(module->indirectExportEntries, unit->offsetToIndirectExportEntryTable);
396 populateExportEntryTable(module->starExportEntries, unit->offsetToStarExportEntryTable);
397 }
398
399 {
400 CompiledData::ImportEntry *entryToWrite = reinterpret_cast<CompiledData::ImportEntry *>(dataPtr + unit->offsetToImportEntryTable);
401 for (const Compiler::ImportEntry &entry: module->importEntries) {
402 entryToWrite->moduleRequest = getStringId(string: entry.moduleRequest);
403 entryToWrite->importName = getStringId(string: entry.importName);
404 entryToWrite->localName = getStringId(string: entry.localName);
405 entryToWrite->location = entry.location;
406 entryToWrite++;
407 }
408 }
409
410 {
411 quint32_le *moduleRequestEntryToWrite = reinterpret_cast<quint32_le *>(dataPtr + unit->offsetToModuleRequestTable);
412 for (const QString &moduleRequest: module->moduleRequests) {
413 *moduleRequestEntryToWrite = getStringId(string: moduleRequest);
414 moduleRequestEntryToWrite++;
415 }
416 }
417
418 // write strings and string table
419 if (option == GenerateWithStringTable)
420 stringTable.serialize(unit);
421
422 generateUnitChecksum(unit);
423
424 return unit;
425}
426
427void QV4::Compiler::JSUnitGenerator::writeFunction(char *f, QV4::Compiler::Context *irFunction) const
428{
429 QV4::CompiledData::Function *function = (QV4::CompiledData::Function *)f;
430
431 quint32 currentOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(divisor: 8, x: sizeof(*function)));
432
433 function->nameIndex = getStringId(string: irFunction->name);
434 function->flags = 0;
435 if (irFunction->isStrict)
436 function->flags |= CompiledData::Function::IsStrict;
437 if (irFunction->isArrowFunction)
438 function->flags |= CompiledData::Function::IsArrowFunction;
439 if (irFunction->isGenerator)
440 function->flags |= CompiledData::Function::IsGenerator;
441 if (irFunction->returnsClosure)
442 function->flags |= CompiledData::Function::IsClosureWrapper;
443
444 if (!irFunction->returnsClosure
445 || irFunction->innerFunctionAccessesThis
446 || irFunction->innerFunctionAccessesNewTarget) {
447 // If the inner function does things with this and new.target we need to do some work in
448 // the outer function. Then we shouldn't directly access the nested function.
449 function->nestedFunctionIndex = std::numeric_limits<uint32_t>::max();
450 } else {
451 // Otherwise we can directly use the nested function.
452 function->nestedFunctionIndex
453 = quint32(module->functions.indexOf(t: irFunction->nestedContexts.first()));
454 }
455
456 function->length = irFunction->formals ? irFunction->formals->length() : 0;
457 function->nFormals = irFunction->arguments.size();
458 function->formalsOffset = currentOffset;
459 currentOffset += function->nFormals * sizeof(CompiledData::Parameter);
460
461 const auto idGenerator = [this](const QString &str) { return getStringId(string: str); };
462
463 QmlIR::Parameter::initType(type: &function->returnType, idGenerator, annotation: irFunction->returnType);
464
465 function->sizeOfLocalTemporalDeadZone = irFunction->sizeOfLocalTemporalDeadZone;
466 function->sizeOfRegisterTemporalDeadZone = irFunction->sizeOfRegisterTemporalDeadZone;
467 function->firstTemporalDeadZoneRegister = irFunction->firstTemporalDeadZoneRegister;
468
469 function->nLocals = irFunction->locals.size();
470 function->localsOffset = currentOffset;
471 currentOffset += function->nLocals * sizeof(quint32);
472
473 function->nLineAndStatementNumbers
474 = irFunction->lineAndStatementNumberMapping.size();
475 Q_ASSERT(function->lineAndStatementNumberOffset() == currentOffset);
476 currentOffset += function->nLineAndStatementNumbers
477 * sizeof(CompiledData::CodeOffsetToLineAndStatement);
478
479 function->nRegisters = irFunction->registerCountInFunction;
480
481 if (!irFunction->labelInfo.empty()) {
482 function->nLabelInfos = quint32(irFunction->labelInfo.size());
483 Q_ASSERT(function->labelInfosOffset() == currentOffset);
484 currentOffset += function->nLabelInfos * sizeof(quint32);
485 }
486
487 function->location.set(line: irFunction->line, column: irFunction->column);
488
489 function->codeOffset = currentOffset;
490 function->codeSize = irFunction->code.size();
491
492 // write formals
493 CompiledData::Parameter *formals = (CompiledData::Parameter *)(f + function->formalsOffset);
494 for (int i = 0; i < irFunction->arguments.size(); ++i) {
495 auto *formal = &formals[i];
496 formal->nameIndex = getStringId(string: irFunction->arguments.at(i).id);
497 if (QQmlJS::AST::TypeAnnotation *annotation = irFunction->arguments.at(i).typeAnnotation.data())
498 QmlIR::Parameter::initType(type: &formal->type, idGenerator, annotation: annotation->type);
499 }
500
501 // write locals
502 quint32_le *locals = (quint32_le *)(f + function->localsOffset);
503 for (int i = 0; i < irFunction->locals.size(); ++i)
504 locals[i] = getStringId(string: irFunction->locals.at(i));
505
506 // write line and statement numbers
507 memcpy(dest: f + function->lineAndStatementNumberOffset(),
508 src: irFunction->lineAndStatementNumberMapping.constData(),
509 n: irFunction->lineAndStatementNumberMapping.size()
510 * sizeof(CompiledData::CodeOffsetToLineAndStatement));
511
512 quint32_le *labels = (quint32_le *)(f + function->labelInfosOffset());
513 for (unsigned u : irFunction->labelInfo) {
514 *labels++ = u;
515 }
516
517 // write byte code
518 memcpy(dest: f + function->codeOffset, src: irFunction->code.constData(), n: irFunction->code.size());
519}
520
521static_assert(int(QV4::Compiler::Class::Method::Regular) == int(QV4::CompiledData::Method::Regular), "Incompatible layout");
522static_assert(int(QV4::Compiler::Class::Method::Getter) == int(QV4::CompiledData::Method::Getter), "Incompatible layout");
523static_assert(int(QV4::Compiler::Class::Method::Setter) == int(QV4::CompiledData::Method::Setter), "Incompatible layout");
524
525void QV4::Compiler::JSUnitGenerator::writeClass(char *b, const QV4::Compiler::Class &c)
526{
527 QV4::CompiledData::Class *cls = reinterpret_cast<QV4::CompiledData::Class *>(b);
528
529 quint32 currentOffset = sizeof(QV4::CompiledData::Class);
530
531 QVector<Class::Method> allMethods = c.staticMethods;
532 allMethods += c.methods;
533
534 cls->constructorFunction = c.constructorIndex;
535 cls->nameIndex = c.nameIndex;
536 cls->nMethods = c.methods.size();
537 cls->nStaticMethods = c.staticMethods.size();
538 cls->methodTableOffset = currentOffset;
539 CompiledData::Method *method = reinterpret_cast<CompiledData::Method *>(b + currentOffset);
540
541 // write methods
542 for (int i = 0; i < allMethods.size(); ++i) {
543 method->name = allMethods.at(i).nameIndex;
544 method->type = allMethods.at(i).type;
545 method->function = allMethods.at(i).functionIndex;
546 ++method;
547 }
548
549 static const bool showCode = qEnvironmentVariableIsSet(varName: "QV4_SHOW_BYTECODE");
550 if (showCode) {
551 qDebug() << "=== Class" << stringForIndex(index: cls->nameIndex) << "static methods"
552 << cls->nStaticMethods << "methods" << cls->nMethods;
553 qDebug() << " constructor:" << cls->constructorFunction;
554 for (uint i = 0; i < cls->nStaticMethods + cls->nMethods; ++i) {
555 QDebug output = qDebug().nospace();
556 output << " " << i << ": ";
557 if (i < cls->nStaticMethods)
558 output << "static ";
559 switch (cls->methodTable()[i].type) {
560 case CompiledData::Method::Getter:
561 output << "get "; break;
562 case CompiledData::Method::Setter:
563 output << "set "; break;
564 default:
565 break;
566 }
567 output << stringForIndex(index: cls->methodTable()[i].name) << " "
568 << cls->methodTable()[i].function;
569 }
570 qDebug().space();
571 }
572}
573
574void QV4::Compiler::JSUnitGenerator::writeTemplateObject(char *b, const QV4::Compiler::TemplateObject &t)
575{
576 QV4::CompiledData::TemplateObject *tmpl = reinterpret_cast<QV4::CompiledData::TemplateObject *>(b);
577 tmpl->size = t.strings.size();
578
579 quint32 currentOffset = sizeof(QV4::CompiledData::TemplateObject);
580
581 quint32_le *strings = reinterpret_cast<quint32_le *>(b + currentOffset);
582
583 // write methods
584 for (int i = 0; i < t.strings.size(); ++i)
585 strings[i] = t.strings.at(i);
586 strings += t.strings.size();
587
588 for (int i = 0; i < t.rawStrings.size(); ++i)
589 strings[i] = t.rawStrings.at(i);
590
591 static const bool showCode = qEnvironmentVariableIsSet(varName: "QV4_SHOW_BYTECODE");
592 if (showCode) {
593 qDebug() << "=== TemplateObject size" << tmpl->size;
594 for (uint i = 0; i < tmpl->size; ++i) {
595 qDebug() << " " << i << stringForIndex(index: tmpl->stringIndexAt(i));
596 qDebug() << " raw: " << stringForIndex(index: tmpl->rawStringIndexAt(i));
597 }
598 qDebug();
599 }
600}
601
602void QV4::Compiler::JSUnitGenerator::writeBlock(char *b, QV4::Compiler::Context *irBlock) const
603{
604 QV4::CompiledData::Block *block = reinterpret_cast<QV4::CompiledData::Block *>(b);
605
606 quint32 currentOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(divisor: 8, x: sizeof(*block)));
607
608 block->sizeOfLocalTemporalDeadZone = irBlock->sizeOfLocalTemporalDeadZone;
609 block->nLocals = irBlock->locals.size();
610 block->localsOffset = currentOffset;
611 currentOffset += block->nLocals * sizeof(quint32);
612
613 // write locals
614 quint32_le *locals = (quint32_le *)(b + block->localsOffset);
615 for (int i = 0; i < irBlock->locals.size(); ++i)
616 locals[i] = getStringId(string: irBlock->locals.at(i));
617
618 static const bool showCode = qEnvironmentVariableIsSet(varName: "QV4_SHOW_BYTECODE");
619 if (showCode) {
620 qDebug() << "=== Variables for block" << irBlock->blockIndex;
621 for (int i = 0; i < irBlock->locals.size(); ++i)
622 qDebug() << " " << i << ":" << locals[i];
623 qDebug();
624 }
625}
626
627QV4::CompiledData::Unit QV4::Compiler::JSUnitGenerator::generateHeader(QV4::Compiler::JSUnitGenerator::GeneratorOption option, quint32_le *blockAndFunctionOffsets, uint *jsClassDataOffset)
628{
629 CompiledData::Unit unit;
630 memset(s: &unit, c: 0, n: sizeof(unit));
631 memcpy(dest: unit.magic, src: CompiledData::magic_str, n: sizeof(unit.magic));
632 unit.flags = QV4::CompiledData::Unit::IsJavascript;
633 unit.flags |= module->unitFlags;
634 unit.version = QV4_DATA_STRUCTURE_VERSION;
635 unit.qtVersion = QT_VERSION;
636 qstrcpy(dst: unit.libraryVersionHash, QML_COMPILE_HASH);
637 memset(s: unit.md5Checksum, c: 0, n: sizeof(unit.md5Checksum));
638 memset(s: unit.dependencyMD5Checksum, c: 0, n: sizeof(unit.dependencyMD5Checksum));
639
640 quint32 nextOffset = sizeof(CompiledData::Unit);
641
642 unit.functionTableSize = module->functions.size();
643 unit.offsetToFunctionTable = nextOffset;
644 nextOffset += unit.functionTableSize * sizeof(uint);
645
646 unit.classTableSize = module->classes.size();
647 unit.offsetToClassTable = nextOffset;
648 nextOffset += unit.classTableSize * sizeof(uint);
649
650 unit.templateObjectTableSize = module->templateObjects.size();
651 unit.offsetToTemplateObjectTable = nextOffset;
652 nextOffset += unit.templateObjectTableSize * sizeof(uint);
653
654 unit.blockTableSize = module->blocks.size();
655 unit.offsetToBlockTable = nextOffset;
656 nextOffset += unit.blockTableSize * sizeof(uint);
657
658 unit.lookupTableSize = lookups.size();
659 unit.offsetToLookupTable = nextOffset;
660 nextOffset += unit.lookupTableSize * sizeof(CompiledData::Lookup);
661
662 unit.regexpTableSize = regexps.size();
663 unit.offsetToRegexpTable = nextOffset;
664 nextOffset += unit.regexpTableSize * sizeof(CompiledData::RegExp);
665
666 unit.constantTableSize = constants.size();
667
668 // Ensure we load constants from well-aligned addresses into for example SSE registers.
669 nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(divisor: 16, x: nextOffset));
670 unit.offsetToConstantTable = nextOffset;
671 nextOffset += unit.constantTableSize * sizeof(ReturnedValue);
672
673 unit.jsClassTableSize = jsClassOffsets.size();
674 unit.offsetToJSClassTable = nextOffset;
675 nextOffset += unit.jsClassTableSize * sizeof(uint);
676
677 *jsClassDataOffset = nextOffset;
678 nextOffset += jsClassData.size();
679
680 nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(divisor: 8, x: nextOffset));
681
682 unit.translationTableSize = translations.size();
683 unit.offsetToTranslationTable = nextOffset;
684 nextOffset += unit.translationTableSize * sizeof(CompiledData::TranslationData);
685 if (unit.translationTableSize != 0) {
686 constexpr auto spaceForTranslationContextId = sizeof(quint32_le);
687 nextOffset += spaceForTranslationContextId;
688 }
689
690 nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(divisor: 8, x: nextOffset));
691
692 const auto reserveExportTable = [&nextOffset](int count, quint32_le *tableSizePtr, quint32_le *offsetPtr) {
693 *tableSizePtr = count;
694 *offsetPtr = nextOffset;
695 nextOffset += count * sizeof(CompiledData::ExportEntry);
696 nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(divisor: 8, x: nextOffset));
697 };
698
699 reserveExportTable(module->localExportEntries.size(), &unit.localExportEntryTableSize, &unit.offsetToLocalExportEntryTable);
700 reserveExportTable(module->indirectExportEntries.size(), &unit.indirectExportEntryTableSize, &unit.offsetToIndirectExportEntryTable);
701 reserveExportTable(module->starExportEntries.size(), &unit.starExportEntryTableSize, &unit.offsetToStarExportEntryTable);
702
703 unit.importEntryTableSize = module->importEntries.size();
704 unit.offsetToImportEntryTable = nextOffset;
705 nextOffset += unit.importEntryTableSize * sizeof(CompiledData::ImportEntry);
706 nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(divisor: 8, x: nextOffset));
707
708 unit.moduleRequestTableSize = module->moduleRequests.size();
709 unit.offsetToModuleRequestTable = nextOffset;
710 nextOffset += unit.moduleRequestTableSize * sizeof(uint);
711 nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(divisor: 8, x: nextOffset));
712
713 quint32 functionSize = 0;
714 for (int i = 0; i < module->functions.size(); ++i) {
715 Context *f = module->functions.at(i);
716 blockAndFunctionOffsets[i] = nextOffset;
717
718 quint32 size = QV4::CompiledData::Function::calculateSize(
719 nFormals: f->arguments.size(), nLocals: f->locals.size(), nLinesAndStatements: f->lineAndStatementNumberMapping.size(),
720 nInnerfunctions: f->nestedContexts.size(), labelInfoSize: int(f->labelInfo.size()), codeSize: f->code.size());
721 functionSize += size - f->code.size();
722 nextOffset += size;
723 }
724
725 blockAndFunctionOffsets += module->functions.size();
726
727 for (int i = 0; i < module->classes.size(); ++i) {
728 const Class &c = module->classes.at(i);
729 blockAndFunctionOffsets[i] = nextOffset;
730
731 nextOffset += QV4::CompiledData::Class::calculateSize(nStaticMethods: c.staticMethods.size(), nMethods: c.methods.size());
732 }
733 blockAndFunctionOffsets += module->classes.size();
734
735 for (int i = 0; i < module->templateObjects.size(); ++i) {
736 const TemplateObject &t = module->templateObjects.at(i);
737 blockAndFunctionOffsets[i] = nextOffset;
738
739 nextOffset += QV4::CompiledData::TemplateObject::calculateSize(size: t.strings.size());
740 }
741 blockAndFunctionOffsets += module->templateObjects.size();
742
743 for (int i = 0; i < module->blocks.size(); ++i) {
744 Context *c = module->blocks.at(i);
745 blockAndFunctionOffsets[i] = nextOffset;
746
747 nextOffset += QV4::CompiledData::Block::calculateSize(nLocals: c->locals.size());
748 }
749
750 if (option == GenerateWithStringTable) {
751 unit.stringTableSize = stringTable.stringCount();
752 nextOffset = static_cast<quint32>(QtPrivate::roundUpToMultipleOf(divisor: 8, x: nextOffset));
753 unit.offsetToStringTable = nextOffset;
754 nextOffset += stringTable.sizeOfTableAndData();
755 } else {
756 unit.stringTableSize = 0;
757 unit.offsetToStringTable = 0;
758 }
759 unit.indexOfRootFunction = -1;
760 unit.sourceFileIndex = getStringId(string: module->fileName);
761 unit.finalUrlIndex = getStringId(string: module->finalUrl);
762 unit.sourceTimeStamp = module->sourceTimeStamp.isValid() ? module->sourceTimeStamp.toMSecsSinceEpoch() : 0;
763 unit.offsetToQmlUnit = 0;
764
765 unit.unitSize = nextOffset;
766
767 static const bool showStats = qEnvironmentVariableIsSet(varName: "QML_SHOW_UNIT_STATS");
768 if (showStats) {
769 qDebug() << "Generated JS unit that is" << unit.unitSize << "bytes contains:";
770 qDebug() << " " << functionSize << "bytes for non-code function data for" << unit.functionTableSize << "functions";
771 qDebug() << " " << translations.size() * sizeof(CompiledData::TranslationData) << "bytes for" << translations.size() << "translations";
772 }
773
774 return unit;
775}
776

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source code of qtdeclarative/src/qml/compiler/qv4compiler.cpp