1/*
2 * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
3 * Copyright (C) 2018 Yusuke Suzuki <yusukesuzuki@slowstart.org>.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28#include "WasmSectionParser.h"
29
30#if ENABLE(WEBASSEMBLY)
31
32#include "IdentifierInlines.h"
33#include "WasmMemoryInformation.h"
34#include "WasmNameSectionParser.h"
35#include "WasmOps.h"
36#include "WasmSections.h"
37#include "WasmSignatureInlines.h"
38#include <wtf/Optional.h>
39
40namespace JSC { namespace Wasm {
41
42auto SectionParser::parseType() -> PartialResult
43{
44 uint32_t count;
45
46 WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get Type section's count");
47 WASM_PARSER_FAIL_IF(count > maxTypes, "Type section's count is too big ", count, " maximum ", maxTypes);
48 WASM_PARSER_FAIL_IF(!m_info->usedSignatures.tryReserveCapacity(count), "can't allocate enough memory for Type section's ", count, " entries");
49
50 for (uint32_t i = 0; i < count; ++i) {
51 int8_t type;
52 uint32_t argumentCount;
53 Vector<Type> argumentTypes;
54
55 WASM_PARSER_FAIL_IF(!parseInt7(type), "can't get ", i, "th Type's type");
56 WASM_PARSER_FAIL_IF(type != Func, i, "th Type is non-Func ", type);
57 WASM_PARSER_FAIL_IF(!parseVarUInt32(argumentCount), "can't get ", i, "th Type's argument count");
58 WASM_PARSER_FAIL_IF(argumentCount > maxFunctionParams, i, "th argument count is too big ", argumentCount, " maximum ", maxFunctionParams);
59 RefPtr<Signature> maybeSignature = Signature::tryCreate(argumentCount);
60 WASM_PARSER_FAIL_IF(!maybeSignature, "can't allocate enough memory for Type section's ", i, "th signature");
61 Ref<Signature> signature = maybeSignature.releaseNonNull();
62
63 for (unsigned i = 0; i < argumentCount; ++i) {
64 Type argumentType;
65 WASM_PARSER_FAIL_IF(!parseValueType(argumentType), "can't get ", i, "th argument Type");
66 signature->argument(i) = argumentType;
67 }
68
69 uint8_t returnCount;
70 WASM_PARSER_FAIL_IF(!parseVarUInt1(returnCount), "can't get ", i, "th Type's return count");
71 Type returnType;
72 if (returnCount) {
73 Type value;
74 WASM_PARSER_FAIL_IF(!parseValueType(value), "can't get ", i, "th Type's return value");
75 returnType = static_cast<Type>(value);
76 } else
77 returnType = Type::Void;
78 signature->returnType() = returnType;
79
80 m_info->usedSignatures.uncheckedAppend(SignatureInformation::adopt(WTFMove(signature)));
81 }
82 return { };
83}
84
85auto SectionParser::parseImport() -> PartialResult
86{
87 uint32_t importCount;
88 WASM_PARSER_FAIL_IF(!parseVarUInt32(importCount), "can't get Import section's count");
89 WASM_PARSER_FAIL_IF(importCount > maxImports, "Import section's count is too big ", importCount, " maximum ", maxImports);
90 WASM_PARSER_FAIL_IF(!m_info->globals.tryReserveCapacity(importCount), "can't allocate enough memory for ", importCount, " globals"); // FIXME this over-allocates when we fix the FIXMEs below.
91 WASM_PARSER_FAIL_IF(!m_info->imports.tryReserveCapacity(importCount), "can't allocate enough memory for ", importCount, " imports"); // FIXME this over-allocates when we fix the FIXMEs below.
92 WASM_PARSER_FAIL_IF(!m_info->importFunctionSignatureIndices.tryReserveCapacity(importCount), "can't allocate enough memory for ", importCount, " import function signatures"); // FIXME this over-allocates when we fix the FIXMEs below.
93
94 for (uint32_t importNumber = 0; importNumber < importCount; ++importNumber) {
95 uint32_t moduleLen;
96 uint32_t fieldLen;
97 Name moduleString;
98 Name fieldString;
99 ExternalKind kind;
100 unsigned kindIndex { 0 };
101
102 WASM_PARSER_FAIL_IF(!parseVarUInt32(moduleLen), "can't get ", importNumber, "th Import's module name length");
103 WASM_PARSER_FAIL_IF(!consumeUTF8String(moduleString, moduleLen), "can't get ", importNumber, "th Import's module name of length ", moduleLen);
104
105 WASM_PARSER_FAIL_IF(!parseVarUInt32(fieldLen), "can't get ", importNumber, "th Import's field name length in module '", moduleString, "'");
106 WASM_PARSER_FAIL_IF(!consumeUTF8String(fieldString, fieldLen), "can't get ", importNumber, "th Import's field name of length ", moduleLen, " in module '", moduleString, "'");
107
108 WASM_PARSER_FAIL_IF(!parseExternalKind(kind), "can't get ", importNumber, "th Import's kind in module '", moduleString, "' field '", fieldString, "'");
109 switch (kind) {
110 case ExternalKind::Function: {
111 uint32_t functionSignatureIndex;
112 WASM_PARSER_FAIL_IF(!parseVarUInt32(functionSignatureIndex), "can't get ", importNumber, "th Import's function signature in module '", moduleString, "' field '", fieldString, "'");
113 WASM_PARSER_FAIL_IF(functionSignatureIndex >= m_info->usedSignatures.size(), "invalid function signature for ", importNumber, "th Import, ", functionSignatureIndex, " is out of range of ", m_info->usedSignatures.size(), " in module '", moduleString, "' field '", fieldString, "'");
114 kindIndex = m_info->importFunctionSignatureIndices.size();
115 SignatureIndex signatureIndex = SignatureInformation::get(m_info->usedSignatures[functionSignatureIndex]);
116 m_info->importFunctionSignatureIndices.uncheckedAppend(signatureIndex);
117 break;
118 }
119 case ExternalKind::Table: {
120 bool isImport = true;
121 PartialResult result = parseTableHelper(isImport);
122 if (UNLIKELY(!result))
123 return makeUnexpected(WTFMove(result.error()));
124 break;
125 }
126 case ExternalKind::Memory: {
127 bool isImport = true;
128 PartialResult result = parseMemoryHelper(isImport);
129 if (UNLIKELY(!result))
130 return makeUnexpected(WTFMove(result.error()));
131 break;
132 }
133 case ExternalKind::Global: {
134 Global global;
135 WASM_FAIL_IF_HELPER_FAILS(parseGlobalType(global));
136 WASM_PARSER_FAIL_IF(global.mutability == Global::Mutable, "Mutable Globals aren't supported");
137
138 kindIndex = m_info->globals.size();
139 m_info->globals.uncheckedAppend(WTFMove(global));
140 break;
141 }
142 }
143
144 m_info->imports.uncheckedAppend({ WTFMove(moduleString), WTFMove(fieldString), kind, kindIndex });
145 }
146
147 m_info->firstInternalGlobal = m_info->globals.size();
148 return { };
149}
150
151auto SectionParser::parseFunction() -> PartialResult
152{
153 uint32_t count;
154 WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get Function section's count");
155 WASM_PARSER_FAIL_IF(count > maxFunctions, "Function section's count is too big ", count, " maximum ", maxFunctions);
156 WASM_PARSER_FAIL_IF(!m_info->internalFunctionSignatureIndices.tryReserveCapacity(count), "can't allocate enough memory for ", count, " Function signatures");
157 WASM_PARSER_FAIL_IF(!m_info->functions.tryReserveCapacity(count), "can't allocate enough memory for ", count, "Function locations");
158
159 for (uint32_t i = 0; i < count; ++i) {
160 uint32_t typeNumber;
161 WASM_PARSER_FAIL_IF(!parseVarUInt32(typeNumber), "can't get ", i, "th Function's type number");
162 WASM_PARSER_FAIL_IF(typeNumber >= m_info->usedSignatures.size(), i, "th Function type number is invalid ", typeNumber);
163
164 SignatureIndex signatureIndex = SignatureInformation::get(m_info->usedSignatures[typeNumber]);
165 // The Code section fixes up start and end.
166 size_t start = 0;
167 size_t end = 0;
168 m_info->internalFunctionSignatureIndices.uncheckedAppend(signatureIndex);
169 m_info->functions.uncheckedAppend({ start, end, Vector<uint8_t>() });
170 }
171
172 return { };
173}
174
175auto SectionParser::parseResizableLimits(uint32_t& initial, Optional<uint32_t>& maximum) -> PartialResult
176{
177 ASSERT(!maximum);
178
179 uint8_t flags;
180 WASM_PARSER_FAIL_IF(!parseVarUInt1(flags), "can't parse resizable limits flags");
181 WASM_PARSER_FAIL_IF(!parseVarUInt32(initial), "can't parse resizable limits initial page count");
182
183 if (flags) {
184 uint32_t maximumInt;
185 WASM_PARSER_FAIL_IF(!parseVarUInt32(maximumInt), "can't parse resizable limits maximum page count");
186 WASM_PARSER_FAIL_IF(initial > maximumInt, "resizable limits has a initial page count of ", initial, " which is greater than its maximum ", maximumInt);
187 maximum = maximumInt;
188 }
189
190 return { };
191}
192
193auto SectionParser::parseTableHelper(bool isImport) -> PartialResult
194{
195 WASM_PARSER_FAIL_IF(m_info->tableCount() > 0, "Cannot have more than one Table for now");
196
197 int8_t type;
198 WASM_PARSER_FAIL_IF(!parseInt7(type), "can't parse Table type");
199 WASM_PARSER_FAIL_IF(type != Wasm::Anyfunc, "Table type should be anyfunc, got ", type);
200
201 uint32_t initial;
202 Optional<uint32_t> maximum;
203 PartialResult limits = parseResizableLimits(initial, maximum);
204 if (UNLIKELY(!limits))
205 return makeUnexpected(WTFMove(limits.error()));
206 WASM_PARSER_FAIL_IF(initial > maxTableEntries, "Table's initial page count of ", initial, " is too big, maximum ", maxTableEntries);
207
208 ASSERT(!maximum || *maximum >= initial);
209
210 m_info->tableInformation = TableInformation(initial, maximum, isImport);
211
212 return { };
213}
214
215auto SectionParser::parseTable() -> PartialResult
216{
217 uint32_t count;
218 WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get Table's count");
219 WASM_PARSER_FAIL_IF(count > 1, "Table count of ", count, " is invalid, at most 1 is allowed for now");
220
221 if (!count)
222 return { };
223
224 bool isImport = false;
225 PartialResult result = parseTableHelper(isImport);
226 if (UNLIKELY(!result))
227 return makeUnexpected(WTFMove(result.error()));
228
229 return { };
230}
231
232auto SectionParser::parseMemoryHelper(bool isImport) -> PartialResult
233{
234 WASM_PARSER_FAIL_IF(m_info->memoryCount(), "there can at most be one Memory section for now");
235
236 PageCount initialPageCount;
237 PageCount maximumPageCount;
238 {
239 uint32_t initial;
240 Optional<uint32_t> maximum;
241 PartialResult limits = parseResizableLimits(initial, maximum);
242 if (UNLIKELY(!limits))
243 return makeUnexpected(WTFMove(limits.error()));
244 ASSERT(!maximum || *maximum >= initial);
245 WASM_PARSER_FAIL_IF(!PageCount::isValid(initial), "Memory's initial page count of ", initial, " is invalid");
246
247 initialPageCount = PageCount(initial);
248
249 if (maximum) {
250 WASM_PARSER_FAIL_IF(!PageCount::isValid(*maximum), "Memory's maximum page count of ", *maximum, " is invalid");
251 maximumPageCount = PageCount(*maximum);
252 }
253 }
254 ASSERT(initialPageCount);
255 ASSERT(!maximumPageCount || maximumPageCount >= initialPageCount);
256
257 m_info->memory = MemoryInformation(initialPageCount, maximumPageCount, isImport);
258 return { };
259}
260
261auto SectionParser::parseMemory() -> PartialResult
262{
263 uint8_t count;
264 WASM_PARSER_FAIL_IF(!parseVarUInt1(count), "can't parse Memory section's count");
265
266 if (!count)
267 return { };
268
269 WASM_PARSER_FAIL_IF(count != 1, "Memory section has more than one memory, WebAssembly currently only allows zero or one");
270
271 bool isImport = false;
272 return parseMemoryHelper(isImport);
273}
274
275auto SectionParser::parseGlobal() -> PartialResult
276{
277 uint32_t globalCount;
278 WASM_PARSER_FAIL_IF(!parseVarUInt32(globalCount), "can't get Global section's count");
279 WASM_PARSER_FAIL_IF(globalCount > maxGlobals, "Global section's count is too big ", globalCount, " maximum ", maxGlobals);
280 size_t totalBytes = globalCount + m_info->firstInternalGlobal;
281 WASM_PARSER_FAIL_IF((static_cast<uint32_t>(totalBytes) < globalCount) || !m_info->globals.tryReserveCapacity(totalBytes), "can't allocate memory for ", totalBytes, " globals");
282
283 for (uint32_t globalIndex = 0; globalIndex < globalCount; ++globalIndex) {
284 Global global;
285 uint8_t initOpcode;
286
287 WASM_FAIL_IF_HELPER_FAILS(parseGlobalType(global));
288 Type typeForInitOpcode;
289 WASM_FAIL_IF_HELPER_FAILS(parseInitExpr(initOpcode, global.initialBitsOrImportNumber, typeForInitOpcode));
290 if (initOpcode == GetGlobal)
291 global.initializationType = Global::FromGlobalImport;
292 else
293 global.initializationType = Global::FromExpression;
294 WASM_PARSER_FAIL_IF(typeForInitOpcode != global.type, "Global init_expr opcode of type ", typeForInitOpcode, " doesn't match global's type ", global.type);
295
296 m_info->globals.uncheckedAppend(WTFMove(global));
297 }
298
299 return { };
300}
301
302auto SectionParser::parseExport() -> PartialResult
303{
304 uint32_t exportCount;
305 WASM_PARSER_FAIL_IF(!parseVarUInt32(exportCount), "can't get Export section's count");
306 WASM_PARSER_FAIL_IF(exportCount > maxExports, "Export section's count is too big ", exportCount, " maximum ", maxExports);
307 WASM_PARSER_FAIL_IF(!m_info->exports.tryReserveCapacity(exportCount), "can't allocate enough memory for ", exportCount, " exports");
308
309 HashSet<String> exportNames;
310 for (uint32_t exportNumber = 0; exportNumber < exportCount; ++exportNumber) {
311 uint32_t fieldLen;
312 Name fieldString;
313 ExternalKind kind;
314 unsigned kindIndex;
315
316 WASM_PARSER_FAIL_IF(!parseVarUInt32(fieldLen), "can't get ", exportNumber, "th Export's field name length");
317 WASM_PARSER_FAIL_IF(!consumeUTF8String(fieldString, fieldLen), "can't get ", exportNumber, "th Export's field name of length ", fieldLen);
318 String fieldName = String::fromUTF8(fieldString);
319 WASM_PARSER_FAIL_IF(exportNames.contains(fieldName), "duplicate export: '", fieldString, "'");
320 exportNames.add(fieldName);
321
322 WASM_PARSER_FAIL_IF(!parseExternalKind(kind), "can't get ", exportNumber, "th Export's kind, named '", fieldString, "'");
323 WASM_PARSER_FAIL_IF(!parseVarUInt32(kindIndex), "can't get ", exportNumber, "th Export's kind index, named '", fieldString, "'");
324 switch (kind) {
325 case ExternalKind::Function: {
326 WASM_PARSER_FAIL_IF(kindIndex >= m_info->functionIndexSpaceSize(), exportNumber, "th Export has invalid function number ", kindIndex, " it exceeds the function index space ", m_info->functionIndexSpaceSize(), ", named '", fieldString, "'");
327 break;
328 }
329 case ExternalKind::Table: {
330 WASM_PARSER_FAIL_IF(kindIndex >= m_info->tableCount(), "can't export Table ", kindIndex, " there are ", m_info->tableCount(), " Tables");
331 break;
332 }
333 case ExternalKind::Memory: {
334 WASM_PARSER_FAIL_IF(!m_info->memory, "can't export a non-existent Memory");
335 WASM_PARSER_FAIL_IF(kindIndex, "can't export Memory ", kindIndex, " only one Table is currently supported");
336 break;
337 }
338 case ExternalKind::Global: {
339 WASM_PARSER_FAIL_IF(kindIndex >= m_info->globals.size(), exportNumber, "th Export has invalid global number ", kindIndex, " it exceeds the globals count ", m_info->globals.size(), ", named '", fieldString, "'");
340 WASM_PARSER_FAIL_IF(m_info->globals[kindIndex].mutability != Global::Immutable, exportNumber, "th Export isn't immutable, named '", fieldString, "'");
341 break;
342 }
343 }
344
345 m_info->exports.uncheckedAppend({ WTFMove(fieldString), kind, kindIndex });
346 }
347
348 return { };
349}
350
351auto SectionParser::parseStart() -> PartialResult
352{
353 uint32_t startFunctionIndex;
354 WASM_PARSER_FAIL_IF(!parseVarUInt32(startFunctionIndex), "can't get Start index");
355 WASM_PARSER_FAIL_IF(startFunctionIndex >= m_info->functionIndexSpaceSize(), "Start index ", startFunctionIndex, " exceeds function index space ", m_info->functionIndexSpaceSize());
356 SignatureIndex signatureIndex = m_info->signatureIndexFromFunctionIndexSpace(startFunctionIndex);
357 const Signature& signature = SignatureInformation::get(signatureIndex);
358 WASM_PARSER_FAIL_IF(signature.argumentCount(), "Start function can't have arguments");
359 WASM_PARSER_FAIL_IF(signature.returnType() != Void, "Start function can't return a value");
360 m_info->startFunctionIndexSpace = startFunctionIndex;
361 return { };
362}
363
364auto SectionParser::parseElement() -> PartialResult
365{
366 uint32_t elementCount;
367 WASM_PARSER_FAIL_IF(!parseVarUInt32(elementCount), "can't get Element section's count");
368 WASM_PARSER_FAIL_IF(elementCount > maxTableEntries, "Element section's count is too big ", elementCount, " maximum ", maxTableEntries);
369 WASM_PARSER_FAIL_IF(!m_info->elements.tryReserveCapacity(elementCount), "can't allocate memory for ", elementCount, " Elements");
370 for (unsigned elementNum = 0; elementNum < elementCount; ++elementNum) {
371 uint32_t tableIndex;
372 uint64_t initExprBits;
373 uint8_t initOpcode;
374 uint32_t indexCount;
375
376 WASM_PARSER_FAIL_IF(!parseVarUInt32(tableIndex), "can't get ", elementNum, "th Element table index");
377 WASM_PARSER_FAIL_IF(tableIndex >= m_info->tableCount(), "Element section for Table ", tableIndex, " exceeds available Table ", m_info->tableCount());
378 Type initExprType;
379 WASM_FAIL_IF_HELPER_FAILS(parseInitExpr(initOpcode, initExprBits, initExprType));
380 WASM_PARSER_FAIL_IF(initExprType != I32, "Element init_expr must produce an i32");
381 WASM_PARSER_FAIL_IF(!parseVarUInt32(indexCount), "can't get ", elementNum, "th index count for Element section");
382 WASM_PARSER_FAIL_IF(indexCount == std::numeric_limits<uint32_t>::max(), "Element section's ", elementNum, "th index count is too big ", indexCount);
383
384 ASSERT(!!m_info->tableInformation);
385
386 Element element(makeI32InitExpr(initOpcode, initExprBits));
387 WASM_PARSER_FAIL_IF(!element.functionIndices.tryReserveCapacity(indexCount), "can't allocate memory for ", indexCount, " Element indices");
388
389 for (unsigned index = 0; index < indexCount; ++index) {
390 uint32_t functionIndex;
391 WASM_PARSER_FAIL_IF(!parseVarUInt32(functionIndex), "can't get Element section's ", elementNum, "th element's ", index, "th index");
392 WASM_PARSER_FAIL_IF(functionIndex >= m_info->functionIndexSpaceSize(), "Element section's ", elementNum, "th element's ", index, "th index is ", functionIndex, " which exceeds the function index space size of ", m_info->functionIndexSpaceSize());
393
394 element.functionIndices.uncheckedAppend(functionIndex);
395 }
396
397 m_info->elements.uncheckedAppend(WTFMove(element));
398 }
399
400 return { };
401}
402
403// This function will be changed to be RELEASE_ASSERT_NOT_REACHED once we switch our parsing infrastructure to the streaming parser.
404auto SectionParser::parseCode() -> PartialResult
405{
406 uint32_t count;
407 WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get Code section's count");
408 WASM_PARSER_FAIL_IF(count == std::numeric_limits<uint32_t>::max(), "Code section's count is too big ", count);
409 WASM_PARSER_FAIL_IF(count != m_info->functions.size(), "Code section count ", count, " exceeds the declared number of functions ", m_info->functions.size());
410
411 for (uint32_t i = 0; i < count; ++i) {
412 uint32_t functionSize;
413 WASM_PARSER_FAIL_IF(!parseVarUInt32(functionSize), "can't get ", i, "th Code function's size");
414 WASM_PARSER_FAIL_IF(functionSize > length(), "Code function's size ", functionSize, " exceeds the module's size ", length());
415 WASM_PARSER_FAIL_IF(functionSize > length() - m_offset, "Code function's size ", functionSize, " exceeds the module's remaining size", length() - m_offset);
416 WASM_PARSER_FAIL_IF(functionSize > maxFunctionSize, "Code function's size ", functionSize, " is too big");
417
418 Vector<uint8_t> data(functionSize);
419 std::memcpy(data.data(), source() + m_offset, functionSize);
420 m_info->functions[i].start = m_offsetInSource + m_offset;
421 m_info->functions[i].end = m_offsetInSource + m_offset + functionSize;
422 m_info->functions[i].data = WTFMove(data);
423 m_offset += functionSize;
424 }
425
426 return { };
427}
428
429auto SectionParser::parseInitExpr(uint8_t& opcode, uint64_t& bitsOrImportNumber, Type& resultType) -> PartialResult
430{
431 WASM_PARSER_FAIL_IF(!parseUInt8(opcode), "can't get init_expr's opcode");
432
433 switch (opcode) {
434 case I32Const: {
435 int32_t constant;
436 WASM_PARSER_FAIL_IF(!parseVarInt32(constant), "can't get constant value for init_expr's i32.const");
437 bitsOrImportNumber = static_cast<uint64_t>(constant);
438 resultType = I32;
439 break;
440 }
441
442 case I64Const: {
443 int64_t constant;
444 WASM_PARSER_FAIL_IF(!parseVarInt64(constant), "can't get constant value for init_expr's i64.const");
445 bitsOrImportNumber = constant;
446 resultType = I64;
447 break;
448 }
449
450 case F32Const: {
451 uint32_t constant;
452 WASM_PARSER_FAIL_IF(!parseUInt32(constant), "can't get constant value for init_expr's f32.const");
453 bitsOrImportNumber = constant;
454 resultType = F32;
455 break;
456 }
457
458 case F64Const: {
459 uint64_t constant;
460 WASM_PARSER_FAIL_IF(!parseUInt64(constant), "can't get constant value for init_expr's f64.const");
461 bitsOrImportNumber = constant;
462 resultType = F64;
463 break;
464 }
465
466 case GetGlobal: {
467 uint32_t index;
468 WASM_PARSER_FAIL_IF(!parseVarUInt32(index), "can't get get_global's index");
469
470 WASM_PARSER_FAIL_IF(index >= m_info->globals.size(), "get_global's index ", index, " exceeds the number of globals ", m_info->globals.size());
471 WASM_PARSER_FAIL_IF(index >= m_info->firstInternalGlobal, "get_global import kind index ", index, " exceeds the first internal global ", m_info->firstInternalGlobal);
472
473 ASSERT(m_info->globals[index].mutability == Global::Immutable);
474 resultType = m_info->globals[index].type;
475 bitsOrImportNumber = index;
476 break;
477 }
478
479 default:
480 WASM_PARSER_FAIL_IF(true, "unknown init_expr opcode ", opcode);
481 }
482
483 uint8_t endOpcode;
484 WASM_PARSER_FAIL_IF(!parseUInt8(endOpcode), "can't get init_expr's end opcode");
485 WASM_PARSER_FAIL_IF(endOpcode != OpType::End, "init_expr should end with end, ended with ", endOpcode);
486
487 return { };
488}
489
490auto SectionParser::parseGlobalType(Global& global) -> PartialResult
491{
492 uint8_t mutability;
493 WASM_PARSER_FAIL_IF(!parseValueType(global.type), "can't get Global's value type");
494 WASM_PARSER_FAIL_IF(!parseVarUInt1(mutability), "can't get Global type's mutability");
495 global.mutability = static_cast<Global::Mutability>(mutability);
496 return { };
497}
498
499auto SectionParser::parseData() -> PartialResult
500{
501 uint32_t segmentCount;
502 WASM_PARSER_FAIL_IF(!parseVarUInt32(segmentCount), "can't get Data section's count");
503 WASM_PARSER_FAIL_IF(segmentCount > maxDataSegments, "Data section's count is too big ", segmentCount, " maximum ", maxDataSegments);
504 WASM_PARSER_FAIL_IF(!m_info->data.tryReserveCapacity(segmentCount), "can't allocate enough memory for Data section's ", segmentCount, " segments");
505
506 for (uint32_t segmentNumber = 0; segmentNumber < segmentCount; ++segmentNumber) {
507 uint32_t memoryIndex;
508 uint64_t initExprBits;
509 uint8_t initOpcode;
510 uint32_t dataByteLength;
511
512 WASM_PARSER_FAIL_IF(!parseVarUInt32(memoryIndex), "can't get ", segmentNumber, "th Data segment's index");
513 WASM_PARSER_FAIL_IF(memoryIndex >= m_info->memoryCount(), segmentNumber, "th Data segment has index ", memoryIndex, " which exceeds the number of Memories ", m_info->memoryCount());
514 Type initExprType;
515 WASM_FAIL_IF_HELPER_FAILS(parseInitExpr(initOpcode, initExprBits, initExprType));
516 WASM_PARSER_FAIL_IF(initExprType != I32, segmentNumber, "th Data segment's init_expr must produce an i32");
517 WASM_PARSER_FAIL_IF(!parseVarUInt32(dataByteLength), "can't get ", segmentNumber, "th Data segment's data byte length");
518 WASM_PARSER_FAIL_IF(dataByteLength > maxModuleSize, segmentNumber, "th Data segment's data byte length is too big ", dataByteLength, " maximum ", maxModuleSize);
519
520 Segment* segment = Segment::create(makeI32InitExpr(initOpcode, initExprBits), dataByteLength);
521 WASM_PARSER_FAIL_IF(!segment, "can't allocate enough memory for ", segmentNumber, "th Data segment of size ", dataByteLength);
522 m_info->data.uncheckedAppend(Segment::adoptPtr(segment));
523 for (uint32_t dataByte = 0; dataByte < dataByteLength; ++dataByte) {
524 uint8_t byte;
525 WASM_PARSER_FAIL_IF(!parseUInt8(byte), "can't get ", dataByte, "th data byte from ", segmentNumber, "th Data segment");
526 segment->byte(dataByte) = byte;
527 }
528 }
529 return { };
530}
531
532auto SectionParser::parseCustom() -> PartialResult
533{
534 CustomSection section;
535 uint32_t customSectionNumber = m_info->customSections.size() + 1;
536 uint32_t nameLen;
537 WASM_PARSER_FAIL_IF(!m_info->customSections.tryReserveCapacity(customSectionNumber), "can't allocate enough memory for ", customSectionNumber, "th custom section");
538 WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get ", customSectionNumber, "th custom section's name length");
539 WASM_PARSER_FAIL_IF(!consumeUTF8String(section.name, nameLen), "nameLen get ", customSectionNumber, "th custom section's name of length ", nameLen);
540
541 uint32_t payloadBytes = length() - m_offset;
542 WASM_PARSER_FAIL_IF(!section.payload.tryReserveCapacity(payloadBytes), "can't allocate enough memory for ", customSectionNumber, "th custom section's ", payloadBytes, " bytes");
543 for (uint32_t byteNumber = 0; byteNumber < payloadBytes; ++byteNumber) {
544 uint8_t byte;
545 WASM_PARSER_FAIL_IF(!parseUInt8(byte), "can't get ", byteNumber, "th data byte from ", customSectionNumber, "th custom section");
546 section.payload.uncheckedAppend(byte);
547 }
548
549 Name nameName = { 'n', 'a', 'm', 'e' };
550 if (section.name == nameName) {
551 NameSectionParser nameSectionParser(section.payload.begin(), section.payload.size(), m_info);
552 if (auto nameSection = nameSectionParser.parse())
553 m_info->nameSection = WTFMove(*nameSection);
554 }
555
556 m_info->customSections.uncheckedAppend(WTFMove(section));
557
558 return { };
559}
560
561} } // namespace JSC::Wasm
562
563#endif // ENABLE(WEBASSEMBLY)
564