| /* |
| * Copyright (C) 2016-2018 Apple Inc. All rights reserved. |
| * Copyright (C) 2018 Yusuke Suzuki <yusukesuzuki@slowstart.org>. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "WasmSectionParser.h" |
| |
| #if ENABLE(WEBASSEMBLY) |
| |
| #include "JSCJSValueInlines.h" |
| #include "WasmMemoryInformation.h" |
| #include "WasmNameSectionParser.h" |
| #include "WasmOps.h" |
| #include "WasmSignatureInlines.h" |
| #include <wtf/HexNumber.h> |
| |
| namespace JSC { namespace Wasm { |
| |
| auto SectionParser::parseType() -> PartialResult |
| { |
| uint32_t count; |
| |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get Type section's count"); |
| WASM_PARSER_FAIL_IF(count > maxTypes, "Type section's count is too big ", count, " maximum ", maxTypes); |
| WASM_PARSER_FAIL_IF(!m_info->usedSignatures.tryReserveCapacity(count), "can't allocate enough memory for Type section's ", count, " entries"); |
| |
| for (uint32_t i = 0; i < count; ++i) { |
| int8_t type; |
| uint32_t argumentCount; |
| Vector<Type> argumentTypes; |
| |
| WASM_PARSER_FAIL_IF(!parseInt7(type), "can't get ", i, "th Type's type"); |
| WASM_PARSER_FAIL_IF(type != static_cast<int8_t>(TypeKind::Func), i, "th Type is non-Func ", type); |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(argumentCount), "can't get ", i, "th Type's argument count"); |
| WASM_PARSER_FAIL_IF(argumentCount > maxFunctionParams, i, "th argument count is too big ", argumentCount, " maximum ", maxFunctionParams); |
| Vector<Type> arguments; |
| WASM_PARSER_FAIL_IF(!arguments.tryReserveCapacity(argumentCount), "can't allocate enough memory for Type section's ", i, "th signature"); |
| |
| for (unsigned i = 0; i < argumentCount; ++i) { |
| Type argumentType; |
| WASM_PARSER_FAIL_IF(!parseValueType(m_info, argumentType), "can't get ", i, "th argument Type"); |
| arguments.append(argumentType); |
| } |
| |
| uint32_t returnCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(returnCount), "can't get ", i, "th Type's return count"); |
| |
| Vector<Type, 1> returnTypes; |
| WASM_PARSER_FAIL_IF(!returnTypes.tryReserveCapacity(argumentCount), "can't allocate enough memory for Type section's ", i, "th signature"); |
| for (unsigned i = 0; i < returnCount; ++i) { |
| Type value; |
| WASM_PARSER_FAIL_IF(!parseValueType(m_info, value), "can't get ", i, "th Type's return value"); |
| returnTypes.append(value); |
| } |
| |
| RefPtr<Signature> signature = SignatureInformation::signatureFor(returnTypes, arguments); |
| WASM_PARSER_FAIL_IF(!signature, "can't allocate enough memory for Type section's ", i, "th signature"); |
| |
| m_info->usedSignatures.uncheckedAppend(signature.releaseNonNull()); |
| } |
| return { }; |
| } |
| |
| auto SectionParser::parseImport() -> PartialResult |
| { |
| uint32_t importCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(importCount), "can't get Import section's count"); |
| WASM_PARSER_FAIL_IF(importCount > maxImports, "Import section's count is too big ", importCount, " maximum ", maxImports); |
| 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. |
| 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. |
| 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. |
| if (Options::useWebAssemblyExceptions()) |
| WASM_PARSER_FAIL_IF(!m_info->importExceptionSignatureIndices.tryReserveCapacity(importCount), "can't allocate enough memory for ", importCount, " import exception signatures"); // FIXME this over-allocates when we fix the FIXMEs below. |
| |
| for (uint32_t importNumber = 0; importNumber < importCount; ++importNumber) { |
| uint32_t moduleLen; |
| uint32_t fieldLen; |
| Name moduleString; |
| Name fieldString; |
| ExternalKind kind; |
| unsigned kindIndex { 0 }; |
| |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(moduleLen), "can't get ", importNumber, "th Import's module name length"); |
| WASM_PARSER_FAIL_IF(!consumeUTF8String(moduleString, moduleLen), "can't get ", importNumber, "th Import's module name of length ", moduleLen); |
| |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(fieldLen), "can't get ", importNumber, "th Import's field name length in module '", moduleString, "'"); |
| WASM_PARSER_FAIL_IF(!consumeUTF8String(fieldString, fieldLen), "can't get ", importNumber, "th Import's field name of length ", moduleLen, " in module '", moduleString, "'"); |
| |
| WASM_PARSER_FAIL_IF(!parseExternalKind(kind), "can't get ", importNumber, "th Import's kind in module '", moduleString, "' field '", fieldString, "'"); |
| switch (kind) { |
| case ExternalKind::Function: { |
| uint32_t functionSignatureIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(functionSignatureIndex), "can't get ", importNumber, "th Import's function signature in module '", moduleString, "' field '", fieldString, "'"); |
| 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, "'"); |
| kindIndex = m_info->importFunctionSignatureIndices.size(); |
| SignatureIndex signatureIndex = SignatureInformation::get(m_info->usedSignatures[functionSignatureIndex]); |
| m_info->importFunctionSignatureIndices.uncheckedAppend(signatureIndex); |
| break; |
| } |
| case ExternalKind::Table: { |
| bool isImport = true; |
| kindIndex = m_info->tables.size(); |
| PartialResult result = parseTableHelper(isImport); |
| if (UNLIKELY(!result)) |
| return makeUnexpected(WTFMove(result.error())); |
| break; |
| } |
| case ExternalKind::Memory: { |
| bool isImport = true; |
| PartialResult result = parseMemoryHelper(isImport); |
| if (UNLIKELY(!result)) |
| return makeUnexpected(WTFMove(result.error())); |
| break; |
| } |
| case ExternalKind::Global: { |
| GlobalInformation global; |
| WASM_FAIL_IF_HELPER_FAILS(parseGlobalType(global)); |
| // Only mutable globals need floating bindings. |
| if (global.mutability == GlobalInformation::Mutability::Mutable) |
| global.bindingMode = GlobalInformation::BindingMode::Portable; |
| kindIndex = m_info->globals.size(); |
| m_info->globals.uncheckedAppend(WTFMove(global)); |
| break; |
| } |
| case ExternalKind::Exception: { |
| WASM_PARSER_FAIL_IF(!Options::useWebAssemblyExceptions(), "wasm exceptions are not enabled"); |
| |
| uint8_t tagType; |
| WASM_PARSER_FAIL_IF(!parseUInt8(tagType), "can't get ", importNumber, "th Import exception's tag type"); |
| WASM_PARSER_FAIL_IF(tagType, importNumber, "th Import exception has tag type ", tagType, " but the only supported tag type is 0"); |
| |
| uint32_t exceptionSignatureIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(exceptionSignatureIndex), "can't get ", importNumber, "th Import's exception signature in module '", moduleString, "' field '", fieldString, "'"); |
| WASM_PARSER_FAIL_IF(exceptionSignatureIndex >= m_info->usedSignatures.size(), "invalid exception signature for ", importNumber, "th Import, ", exceptionSignatureIndex, " is out of range of ", m_info->usedSignatures.size(), " in module '", moduleString, "' field '", fieldString, "'"); |
| kindIndex = m_info->importExceptionSignatureIndices.size(); |
| SignatureIndex signatureIndex = SignatureInformation::get(m_info->usedSignatures[exceptionSignatureIndex]); |
| m_info->importExceptionSignatureIndices.uncheckedAppend(signatureIndex); |
| break; |
| } |
| } |
| |
| m_info->imports.uncheckedAppend({ WTFMove(moduleString), WTFMove(fieldString), kind, kindIndex }); |
| } |
| |
| m_info->firstInternalGlobal = m_info->globals.size(); |
| return { }; |
| } |
| |
| auto SectionParser::parseFunction() -> PartialResult |
| { |
| uint32_t count; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get Function section's count"); |
| WASM_PARSER_FAIL_IF(count > maxFunctions, "Function section's count is too big ", count, " maximum ", maxFunctions); |
| WASM_PARSER_FAIL_IF(!m_info->internalFunctionSignatureIndices.tryReserveCapacity(count), "can't allocate enough memory for ", count, " Function signatures"); |
| WASM_PARSER_FAIL_IF(!m_info->functions.tryReserveCapacity(count), "can't allocate enough memory for ", count, "Function locations"); |
| |
| for (uint32_t i = 0; i < count; ++i) { |
| uint32_t typeNumber; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(typeNumber), "can't get ", i, "th Function's type number"); |
| WASM_PARSER_FAIL_IF(typeNumber >= m_info->usedSignatures.size(), i, "th Function type number is invalid ", typeNumber); |
| |
| SignatureIndex signatureIndex = SignatureInformation::get(m_info->usedSignatures[typeNumber]); |
| // The Code section fixes up start and end. |
| size_t start = 0; |
| size_t end = 0; |
| m_info->internalFunctionSignatureIndices.uncheckedAppend(signatureIndex); |
| m_info->functions.uncheckedAppend({ start, end, Vector<uint8_t>() }); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseResizableLimits(uint32_t& initial, std::optional<uint32_t>& maximum, bool& isShared, LimitsType limitsType) -> PartialResult |
| { |
| ASSERT(!maximum); |
| |
| uint8_t flags; |
| WASM_PARSER_FAIL_IF(!parseUInt8(flags), "can't parse resizable limits flags"); |
| WASM_PARSER_FAIL_IF(flags != 0x0 && flags != 0x1 && flags != 0x3, "resizable limits flag should be 0x00, 0x01, or 0x03 but 0x", hex(flags, 2, Lowercase)); |
| WASM_PARSER_FAIL_IF(flags == 0x3 && limitsType != LimitsType::Memory, "can't use shared limits for non memory"); |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(initial), "can't parse resizable limits initial page count"); |
| |
| isShared = flags == 0x3; |
| WASM_PARSER_FAIL_IF(isShared && !Options::useSharedArrayBuffer(), "shared memory is not enabled"); |
| |
| if (flags) { |
| uint32_t maximumInt; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(maximumInt), "can't parse resizable limits maximum page count"); |
| WASM_PARSER_FAIL_IF(initial > maximumInt, "resizable limits has an initial page count of ", initial, " which is greater than its maximum ", maximumInt); |
| maximum = maximumInt; |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseTableHelper(bool isImport) -> PartialResult |
| { |
| WASM_PARSER_FAIL_IF(m_info->tableCount() >= maxTables, "Table count of ", m_info->tableCount(), " is too big, maximum ", maxTables); |
| |
| int8_t type; |
| WASM_PARSER_FAIL_IF(!parseInt7(type), "can't parse Table type"); |
| WASM_PARSER_FAIL_IF(type != static_cast<int8_t>(TypeKind::Funcref) && type != static_cast<int8_t>(TypeKind::Externref), "Table type should be funcref or anyref, got ", type); |
| |
| uint32_t initial; |
| std::optional<uint32_t> maximum; |
| bool isShared = false; |
| PartialResult limits = parseResizableLimits(initial, maximum, isShared, LimitsType::Table); |
| if (UNLIKELY(!limits)) |
| return makeUnexpected(WTFMove(limits.error())); |
| WASM_PARSER_FAIL_IF(initial > maxTableEntries, "Table's initial page count of ", initial, " is too big, maximum ", maxTableEntries); |
| |
| ASSERT(!maximum || *maximum >= initial); |
| |
| TableElementType tableType = type == static_cast<int8_t>(TypeKind::Funcref) ? TableElementType::Funcref : TableElementType::Externref; |
| m_info->tables.append(TableInformation(initial, maximum, isImport, tableType)); |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseTable() -> PartialResult |
| { |
| uint32_t count; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get Table's count"); |
| |
| for (unsigned i = 0; i < count; ++i) { |
| bool isImport = false; |
| PartialResult result = parseTableHelper(isImport); |
| if (UNLIKELY(!result)) |
| return makeUnexpected(WTFMove(result.error())); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseMemoryHelper(bool isImport) -> PartialResult |
| { |
| WASM_PARSER_FAIL_IF(m_info->memoryCount(), "there can at most be one Memory section for now"); |
| |
| PageCount initialPageCount; |
| PageCount maximumPageCount; |
| bool isShared = false; |
| { |
| uint32_t initial; |
| std::optional<uint32_t> maximum; |
| PartialResult limits = parseResizableLimits(initial, maximum, isShared, LimitsType::Memory); |
| if (UNLIKELY(!limits)) |
| return makeUnexpected(WTFMove(limits.error())); |
| ASSERT(!maximum || *maximum >= initial); |
| WASM_PARSER_FAIL_IF(!PageCount::isValid(initial), "Memory's initial page count of ", initial, " is invalid"); |
| |
| initialPageCount = PageCount(initial); |
| |
| if (maximum) { |
| WASM_PARSER_FAIL_IF(!PageCount::isValid(*maximum), "Memory's maximum page count of ", *maximum, " is invalid"); |
| maximumPageCount = PageCount(*maximum); |
| } |
| } |
| ASSERT(initialPageCount); |
| ASSERT(!maximumPageCount || maximumPageCount >= initialPageCount); |
| |
| m_info->memory = MemoryInformation(initialPageCount, maximumPageCount, isShared, isImport); |
| return { }; |
| } |
| |
| auto SectionParser::parseMemory() -> PartialResult |
| { |
| uint32_t count; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't parse Memory section's count"); |
| |
| if (!count) |
| return { }; |
| |
| WASM_PARSER_FAIL_IF(count != 1, "Memory section has more than one memory, WebAssembly currently only allows zero or one"); |
| |
| bool isImport = false; |
| return parseMemoryHelper(isImport); |
| } |
| |
| auto SectionParser::parseGlobal() -> PartialResult |
| { |
| uint32_t globalCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(globalCount), "can't get Global section's count"); |
| WASM_PARSER_FAIL_IF(globalCount > maxGlobals, "Global section's count is too big ", globalCount, " maximum ", maxGlobals); |
| size_t totalBytes = globalCount + m_info->firstInternalGlobal; |
| WASM_PARSER_FAIL_IF((static_cast<uint32_t>(totalBytes) < globalCount) || !m_info->globals.tryReserveCapacity(totalBytes), "can't allocate memory for ", totalBytes, " globals"); |
| |
| for (uint32_t globalIndex = 0; globalIndex < globalCount; ++globalIndex) { |
| GlobalInformation global; |
| uint8_t initOpcode; |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseGlobalType(global)); |
| Type typeForInitOpcode; |
| WASM_FAIL_IF_HELPER_FAILS(parseInitExpr(initOpcode, global.initialBitsOrImportNumber, typeForInitOpcode)); |
| if (initOpcode == GetGlobal) |
| global.initializationType = GlobalInformation::FromGlobalImport; |
| else if (initOpcode == RefFunc) |
| global.initializationType = GlobalInformation::FromRefFunc; |
| else |
| global.initializationType = GlobalInformation::FromExpression; |
| WASM_PARSER_FAIL_IF(!isSubtype(typeForInitOpcode, global.type), "Global init_expr opcode of type ", typeForInitOpcode.kind, " doesn't match global's type ", global.type.kind); |
| |
| if (initOpcode == RefFunc) |
| m_info->addDeclaredFunction(global.initialBitsOrImportNumber); |
| |
| m_info->globals.uncheckedAppend(WTFMove(global)); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseExport() -> PartialResult |
| { |
| uint32_t exportCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(exportCount), "can't get Export section's count"); |
| WASM_PARSER_FAIL_IF(exportCount > maxExports, "Export section's count is too big ", exportCount, " maximum ", maxExports); |
| WASM_PARSER_FAIL_IF(!m_info->exports.tryReserveCapacity(exportCount), "can't allocate enough memory for ", exportCount, " exports"); |
| |
| HashSet<String> exportNames; |
| for (uint32_t exportNumber = 0; exportNumber < exportCount; ++exportNumber) { |
| uint32_t fieldLen; |
| Name fieldString; |
| ExternalKind kind; |
| unsigned kindIndex; |
| |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(fieldLen), "can't get ", exportNumber, "th Export's field name length"); |
| WASM_PARSER_FAIL_IF(!consumeUTF8String(fieldString, fieldLen), "can't get ", exportNumber, "th Export's field name of length ", fieldLen); |
| String fieldName = String::fromUTF8(fieldString); |
| WASM_PARSER_FAIL_IF(exportNames.contains(fieldName), "duplicate export: '", fieldString, "'"); |
| exportNames.add(fieldName); |
| |
| WASM_PARSER_FAIL_IF(!parseExternalKind(kind), "can't get ", exportNumber, "th Export's kind, named '", fieldString, "'"); |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(kindIndex), "can't get ", exportNumber, "th Export's kind index, named '", fieldString, "'"); |
| switch (kind) { |
| case ExternalKind::Function: { |
| 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, "'"); |
| m_info->addDeclaredFunction(kindIndex); |
| break; |
| } |
| case ExternalKind::Table: { |
| WASM_PARSER_FAIL_IF(kindIndex >= m_info->tableCount(), "can't export Table ", kindIndex, " there are ", m_info->tableCount(), " Tables"); |
| break; |
| } |
| case ExternalKind::Memory: { |
| WASM_PARSER_FAIL_IF(!m_info->memory, "can't export a non-existent Memory"); |
| WASM_PARSER_FAIL_IF(kindIndex, "can't export Memory ", kindIndex, " only one Table is currently supported"); |
| break; |
| } |
| case ExternalKind::Global: { |
| 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, "'"); |
| // Only mutable globals need floating bindings. |
| GlobalInformation& global = m_info->globals[kindIndex]; |
| if (global.mutability == GlobalInformation::Mutability::Mutable) |
| global.bindingMode = GlobalInformation::BindingMode::Portable; |
| break; |
| } |
| case ExternalKind::Exception: { |
| WASM_PARSER_FAIL_IF(!Options::useWebAssemblyExceptions(), "wasm exceptions are not enabled"); |
| |
| WASM_PARSER_FAIL_IF(kindIndex >= m_info->exceptionIndexSpaceSize(), exportNumber, "th Export has invalid exception number ", kindIndex, " it exceeds the exception index space ", m_info->exceptionIndexSpaceSize(), ", named '", fieldString, "'"); |
| m_info->addDeclaredException(kindIndex); |
| break; |
| } |
| } |
| |
| m_info->exports.uncheckedAppend({ WTFMove(fieldString), kind, kindIndex }); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseStart() -> PartialResult |
| { |
| uint32_t startFunctionIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(startFunctionIndex), "can't get Start index"); |
| WASM_PARSER_FAIL_IF(startFunctionIndex >= m_info->functionIndexSpaceSize(), "Start index ", startFunctionIndex, " exceeds function index space ", m_info->functionIndexSpaceSize()); |
| SignatureIndex signatureIndex = m_info->signatureIndexFromFunctionIndexSpace(startFunctionIndex); |
| const Signature& signature = SignatureInformation::get(signatureIndex); |
| WASM_PARSER_FAIL_IF(signature.argumentCount(), "Start function can't have arguments"); |
| WASM_PARSER_FAIL_IF(!signature.returnsVoid(), "Start function can't return a value"); |
| m_info->startFunctionIndexSpace = startFunctionIndex; |
| return { }; |
| } |
| |
| auto SectionParser::parseElement() -> PartialResult |
| { |
| uint32_t elementCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(elementCount), "can't get Element section's count"); |
| WASM_PARSER_FAIL_IF(elementCount > maxTableEntries, "Element section's count is too big ", elementCount, " maximum ", maxTableEntries); |
| WASM_PARSER_FAIL_IF(!m_info->elements.tryReserveCapacity(elementCount), "can't allocate memory for ", elementCount, " Elements"); |
| for (unsigned elementNum = 0; elementNum < elementCount; ++elementNum) { |
| uint8_t elementFlags; |
| WASM_PARSER_FAIL_IF(!parseUInt8(elementFlags), "can't get ", elementNum, "th Element reserved byte, which should be element flags"); |
| |
| switch (elementFlags) { |
| case 0x00: { |
| constexpr uint32_t tableIndex = 0; |
| WASM_FAIL_IF_HELPER_FAILS(validateElementTableIdx(tableIndex)); |
| |
| std::optional<I32InitExpr> initExpr; |
| WASM_FAIL_IF_HELPER_FAILS(parseI32InitExprForElementSection(initExpr)); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| ASSERT(!!m_info->tables[tableIndex]); |
| |
| Element element(Element::Kind::Active, TableElementType::Funcref, tableIndex, WTFMove(initExpr)); |
| WASM_PARSER_FAIL_IF(!element.functionIndices.tryReserveCapacity(indexCount), "can't allocate memory for ", indexCount, " Element indices"); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfIndexes(element.functionIndices, indexCount, elementNum)); |
| m_info->elements.uncheckedAppend(WTFMove(element)); |
| break; |
| } |
| case 0x01: { |
| uint8_t elementKind; |
| WASM_FAIL_IF_HELPER_FAILS(parseElementKind(elementKind)); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| Element element(Element::Kind::Passive, TableElementType::Funcref); |
| WASM_PARSER_FAIL_IF(!element.functionIndices.tryReserveCapacity(indexCount), "can't allocate memory for ", indexCount, " Element indices"); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfIndexes(element.functionIndices, indexCount, elementNum)); |
| m_info->elements.uncheckedAppend(WTFMove(element)); |
| break; |
| } |
| case 0x02: { |
| uint32_t tableIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(tableIndex), "can't get ", elementNum, "th Element table index"); |
| WASM_FAIL_IF_HELPER_FAILS(validateElementTableIdx(tableIndex)); |
| |
| std::optional<I32InitExpr> initExpr; |
| WASM_FAIL_IF_HELPER_FAILS(parseI32InitExprForElementSection(initExpr)); |
| |
| uint8_t elementKind; |
| WASM_FAIL_IF_HELPER_FAILS(parseElementKind(elementKind)); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| ASSERT(!!m_info->tables[tableIndex]); |
| |
| Element element(Element::Kind::Active, TableElementType::Funcref, tableIndex, WTFMove(initExpr)); |
| WASM_PARSER_FAIL_IF(!element.functionIndices.tryReserveCapacity(indexCount), "can't allocate memory for ", indexCount, " Element indices"); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfIndexes(element.functionIndices, indexCount, elementNum)); |
| m_info->elements.uncheckedAppend(WTFMove(element)); |
| break; |
| } |
| case 0x03: { |
| uint8_t elementKind; |
| WASM_FAIL_IF_HELPER_FAILS(parseElementKind(elementKind)); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| Element element(Element::Kind::Declared, TableElementType::Funcref); |
| WASM_PARSER_FAIL_IF(!element.functionIndices.tryReserveCapacity(indexCount), "can't allocate memory for ", indexCount, " Element indices"); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfIndexes(element.functionIndices, indexCount, elementNum)); |
| m_info->elements.uncheckedAppend(WTFMove(element)); |
| break; |
| } |
| case 0x04: { |
| constexpr uint32_t tableIndex = 0; |
| WASM_FAIL_IF_HELPER_FAILS(validateElementTableIdx(tableIndex)); |
| |
| std::optional<I32InitExpr> initExpr; |
| WASM_FAIL_IF_HELPER_FAILS(parseI32InitExprForElementSection(initExpr)); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| ASSERT(!!m_info->tables[tableIndex]); |
| |
| Element element(Element::Kind::Active, TableElementType::Funcref, tableIndex, WTFMove(initExpr)); |
| WASM_PARSER_FAIL_IF(!element.functionIndices.tryReserveCapacity(indexCount), "can't allocate memory for ", indexCount, " Element indices"); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfExpressions(element.functionIndices, indexCount, elementNum)); |
| m_info->elements.uncheckedAppend(WTFMove(element)); |
| break; |
| } |
| case 0x05: { |
| Type refType; |
| WASM_PARSER_FAIL_IF(!parseRefType(m_info, refType), "can't parse reftype in elem section"); |
| WASM_PARSER_FAIL_IF(!refType.isFuncref(), "reftype in element section should be funcref"); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| |
| Element element(Element::Kind::Passive, TableElementType::Funcref); |
| WASM_PARSER_FAIL_IF(!element.functionIndices.tryReserveCapacity(indexCount), "can't allocate memory for ", indexCount, " Element indices"); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfExpressions(element.functionIndices, indexCount, elementNum)); |
| m_info->elements.uncheckedAppend(WTFMove(element)); |
| break; |
| } |
| case 0x06: { |
| uint32_t tableIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(tableIndex), "can't get ", elementNum, "th Element table index"); |
| WASM_FAIL_IF_HELPER_FAILS(validateElementTableIdx(tableIndex)); |
| |
| std::optional<I32InitExpr> initExpr; |
| WASM_FAIL_IF_HELPER_FAILS(parseI32InitExprForElementSection(initExpr)); |
| |
| Type refType; |
| WASM_PARSER_FAIL_IF(!parseRefType(m_info, refType), "can't parse reftype in elem section"); |
| WASM_PARSER_FAIL_IF(!refType.isFuncref(), "reftype in element section should be funcref"); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| ASSERT(!!m_info->tables[tableIndex]); |
| |
| Element element(Element::Kind::Active, TableElementType::Funcref, tableIndex, WTFMove(initExpr)); |
| WASM_PARSER_FAIL_IF(!element.functionIndices.tryReserveCapacity(indexCount), "can't allocate memory for ", indexCount, " Element indices"); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfExpressions(element.functionIndices, indexCount, elementNum)); |
| m_info->elements.uncheckedAppend(WTFMove(element)); |
| break; |
| } |
| case 0x07: { |
| Type refType; |
| WASM_PARSER_FAIL_IF(!parseRefType(m_info, refType), "can't parse reftype in elem section"); |
| WASM_PARSER_FAIL_IF(!refType.isFuncref(), "reftype in element section should be funcref"); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| |
| Element element(Element::Kind::Declared, TableElementType::Funcref); |
| WASM_PARSER_FAIL_IF(!element.functionIndices.tryReserveCapacity(indexCount), "can't allocate memory for ", indexCount, " Element indices"); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfExpressions(element.functionIndices, indexCount, elementNum)); |
| m_info->elements.uncheckedAppend(WTFMove(element)); |
| break; |
| } |
| default: |
| WASM_PARSER_FAIL_IF(true, "can't get ", elementNum, "th Element reserved byte"); |
| } |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseCode() -> PartialResult |
| { |
| // The Code section is handled specially in StreamingParser. |
| RELEASE_ASSERT_NOT_REACHED(); |
| return { }; |
| } |
| |
| auto SectionParser::parseInitExpr(uint8_t& opcode, uint64_t& bitsOrImportNumber, Type& resultType) -> PartialResult |
| { |
| WASM_PARSER_FAIL_IF(!parseUInt8(opcode), "can't get init_expr's opcode"); |
| |
| switch (opcode) { |
| case I32Const: { |
| int32_t constant; |
| WASM_PARSER_FAIL_IF(!parseVarInt32(constant), "can't get constant value for init_expr's i32.const"); |
| bitsOrImportNumber = static_cast<uint64_t>(constant); |
| resultType = Types::I32; |
| break; |
| } |
| |
| case I64Const: { |
| int64_t constant; |
| WASM_PARSER_FAIL_IF(!parseVarInt64(constant), "can't get constant value for init_expr's i64.const"); |
| bitsOrImportNumber = constant; |
| resultType = Types::I64; |
| break; |
| } |
| |
| case F32Const: { |
| uint32_t constant; |
| WASM_PARSER_FAIL_IF(!parseUInt32(constant), "can't get constant value for init_expr's f32.const"); |
| bitsOrImportNumber = constant; |
| resultType = Types::F32; |
| break; |
| } |
| |
| case F64Const: { |
| uint64_t constant; |
| WASM_PARSER_FAIL_IF(!parseUInt64(constant), "can't get constant value for init_expr's f64.const"); |
| bitsOrImportNumber = constant; |
| resultType = Types::F64; |
| break; |
| } |
| |
| case GetGlobal: { |
| uint32_t index; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(index), "can't get get_global's index"); |
| |
| WASM_PARSER_FAIL_IF(index >= m_info->globals.size(), "get_global's index ", index, " exceeds the number of globals ", m_info->globals.size()); |
| WASM_PARSER_FAIL_IF(index >= m_info->firstInternalGlobal, "get_global import kind index ", index, " exceeds the first internal global ", m_info->firstInternalGlobal); |
| WASM_PARSER_FAIL_IF(m_info->globals[index].mutability != GlobalInformation::Immutable, "get_global import kind index ", index, " is mutable "); |
| |
| resultType = m_info->globals[index].type; |
| bitsOrImportNumber = index; |
| break; |
| } |
| |
| case RefNull: { |
| Type typeOfNull; |
| if (Options::useWebAssemblyTypedFunctionReferences()) { |
| int32_t heapType; |
| WASM_PARSER_FAIL_IF(!parseHeapType(m_info, heapType), "ref.null heaptype must be funcref, externref or type_idx"); |
| if (isTypeIndexHeapType(heapType)) { |
| SignatureIndex signatureIndex = SignatureInformation::get(m_info->usedSignatures[heapType].get()); |
| typeOfNull = Type { TypeKind::RefNull, Nullable::Yes, signatureIndex }; |
| } else |
| typeOfNull = Type { TypeKind::RefNull, Nullable::Yes, static_cast<SignatureIndex>(heapType) }; |
| } else |
| WASM_PARSER_FAIL_IF(!parseRefType(m_info, typeOfNull), "ref.null type must be a reference type"); |
| |
| resultType = typeOfNull; |
| bitsOrImportNumber = JSValue::encode(jsNull()); |
| break; |
| } |
| |
| case RefFunc: { |
| uint32_t index; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(index), "can't get ref.func index"); |
| WASM_PARSER_FAIL_IF(index >= m_info->functions.size(), "ref.func index", index, " exceeds the number of functions ", m_info->functions.size()); |
| |
| if (Options::useWebAssemblyTypedFunctionReferences()) { |
| SignatureIndex signatureIndex = m_info->signatureIndexFromFunctionIndexSpace(index); |
| resultType = { TypeKind::Ref, Nullable::No, signatureIndex }; |
| } else |
| resultType = Types::Funcref; |
| |
| bitsOrImportNumber = index; |
| break; |
| } |
| |
| default: |
| WASM_PARSER_FAIL_IF(true, "unknown init_expr opcode ", opcode); |
| } |
| |
| uint8_t endOpcode; |
| WASM_PARSER_FAIL_IF(!parseUInt8(endOpcode), "can't get init_expr's end opcode"); |
| WASM_PARSER_FAIL_IF(endOpcode != OpType::End, "init_expr should end with end, ended with ", endOpcode); |
| |
| return { }; |
| } |
| |
| auto SectionParser::validateElementTableIdx(uint32_t tableIndex) -> PartialResult |
| { |
| WASM_PARSER_FAIL_IF(tableIndex >= m_info->tableCount(), "Element section for Table ", tableIndex, " exceeds available Table ", m_info->tableCount()); |
| WASM_PARSER_FAIL_IF(m_info->tables[tableIndex].type() != TableElementType::Funcref, "Table ", tableIndex, " must have type 'funcref' to have an element section"); |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseI32InitExpr(std::optional<I32InitExpr>& initExpr, ASCIILiteral failMessage) -> PartialResult |
| { |
| uint8_t initOpcode; |
| uint64_t initExprBits; |
| Type initExprType; |
| WASM_FAIL_IF_HELPER_FAILS(parseInitExpr(initOpcode, initExprBits, initExprType)); |
| WASM_PARSER_FAIL_IF(!initExprType.isI32(), failMessage); |
| initExpr = makeI32InitExpr(initOpcode, initExprBits); |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseI32InitExprForElementSection(std::optional<I32InitExpr>& initExpr) -> PartialResult |
| { |
| return parseI32InitExpr(initExpr, "Element init_expr must produce an i32"_s); |
| } |
| |
| auto SectionParser::parseElementKind(uint8_t& resultElementKind) -> PartialResult |
| { |
| uint8_t elementKind; |
| WASM_PARSER_FAIL_IF(!parseUInt8(elementKind), "can't get element kind"); |
| WASM_PARSER_FAIL_IF(!!elementKind, "element kind must be zero"); |
| resultElementKind = elementKind; |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseIndexCountForElementSection(uint32_t& resultIndexCount, const unsigned elementNum) -> PartialResult |
| { |
| uint32_t indexCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(indexCount), "can't get ", elementNum, "th index count for Element section"); |
| WASM_PARSER_FAIL_IF(indexCount == std::numeric_limits<uint32_t>::max(), "Element section's ", elementNum, "th index count is too big ", indexCount); |
| resultIndexCount = indexCount; |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseElementSegmentVectorOfExpressions(Vector<uint32_t>& result, const unsigned indexCount, const unsigned elementNum) -> PartialResult |
| { |
| for (uint32_t index = 0; index < indexCount; ++index) { |
| uint8_t opcode; |
| WASM_PARSER_FAIL_IF(!parseUInt8(opcode), "can't get opcode for exp in element section's ", elementNum, "th element's ", index, "th index"); |
| WASM_PARSER_FAIL_IF((opcode != RefFunc) && (opcode != RefNull), "opcode for exp in element section's should be either ref.func or ref.null ", elementNum, "th element's ", index, "th index"); |
| |
| uint32_t functionIndex; |
| if (opcode == RefFunc) { |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(functionIndex), "can't get Element section's ", elementNum, "th element's ", index, "th index"); |
| 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()); |
| m_info->addDeclaredFunction(functionIndex); |
| } else { |
| Type typeOfNull; |
| WASM_PARSER_FAIL_IF(!parseRefType(m_info, typeOfNull), "ref.null type must be a func type in elem section"); |
| WASM_PARSER_FAIL_IF(!typeOfNull.isFuncref(), "ref.null extern is forbidden in element section's, ", elementNum, "th element's ", index, "th index"); |
| functionIndex = Element::nullFuncIndex; |
| } |
| |
| WASM_PARSER_FAIL_IF(!parseUInt8(opcode), "can't get opcode for exp end in element section's ", elementNum, "th element's ", index, "th index"); |
| WASM_PARSER_FAIL_IF(opcode != End, "malformed expr in element section's", elementNum, "th element's ", index, "th index"); |
| |
| result.uncheckedAppend(functionIndex); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseElementSegmentVectorOfIndexes(Vector<uint32_t>& result, const unsigned indexCount, const unsigned elementNum) -> PartialResult |
| { |
| for (uint32_t index = 0; index < indexCount; ++index) { |
| uint32_t functionIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(functionIndex), "can't get Element section's ", elementNum, "th element's ", index, "th index"); |
| 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()); |
| |
| m_info->addDeclaredFunction(functionIndex); |
| result.uncheckedAppend(functionIndex); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseI32InitExprForDataSection(std::optional<I32InitExpr>& initExpr) -> PartialResult |
| { |
| return parseI32InitExpr(initExpr, "Data init_expr must produce an i32"_s); |
| } |
| |
| auto SectionParser::parseGlobalType(GlobalInformation& global) -> PartialResult |
| { |
| uint8_t mutability; |
| WASM_PARSER_FAIL_IF(!parseValueType(m_info, global.type), "can't get Global's value type"); |
| WASM_PARSER_FAIL_IF(!parseUInt8(mutability), "can't get Global type's mutability"); |
| WASM_PARSER_FAIL_IF(mutability != 0x0 && mutability != 0x1, "invalid Global's mutability: 0x", hex(mutability, 2, Lowercase)); |
| global.mutability = static_cast<GlobalInformation::Mutability>(mutability); |
| return { }; |
| } |
| |
| auto SectionParser::parseData() -> PartialResult |
| { |
| uint32_t segmentCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(segmentCount), "can't get Data section's count"); |
| WASM_PARSER_FAIL_IF(segmentCount > maxDataSegments, "Data section's count is too big ", segmentCount, " maximum ", maxDataSegments); |
| WASM_PARSER_FAIL_IF(!m_info->data.tryReserveCapacity(segmentCount), "can't allocate enough memory for Data section's ", segmentCount, " segments"); |
| |
| for (uint32_t segmentNumber = 0; segmentNumber < segmentCount; ++segmentNumber) { |
| uint32_t memoryIndexOrDataFlag = UINT32_MAX; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(memoryIndexOrDataFlag), "can't get ", segmentNumber, "th Data segment's flag"); |
| |
| if (!memoryIndexOrDataFlag) { |
| const uint32_t memoryIndex = memoryIndexOrDataFlag; |
| WASM_PARSER_FAIL_IF(memoryIndex >= m_info->memoryCount(), segmentNumber, "th Data segment has index ", memoryIndex, " which exceeds the number of Memories ", m_info->memoryCount()); |
| |
| std::optional<I32InitExpr> initExpr; |
| WASM_FAIL_IF_HELPER_FAILS(parseI32InitExprForDataSection(initExpr)); |
| |
| uint32_t dataByteLength; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(dataByteLength), "can't get ", segmentNumber, "th Data segment's data byte length"); |
| WASM_PARSER_FAIL_IF(dataByteLength > maxModuleSize, segmentNumber, "th Data segment's data byte length is too big ", dataByteLength, " maximum ", maxModuleSize); |
| |
| auto segment = Segment::create(*initExpr, dataByteLength, Segment::Kind::Active); |
| WASM_PARSER_FAIL_IF(!segment, "can't allocate enough memory for ", segmentNumber, "th Data segment of size ", dataByteLength); |
| for (uint32_t dataByte = 0; dataByte < dataByteLength; ++dataByte) { |
| uint8_t byte; |
| WASM_PARSER_FAIL_IF(!parseUInt8(byte), "can't get ", dataByte, "th data byte from ", segmentNumber, "th Data segment"); |
| segment->byte(dataByte) = byte; |
| } |
| m_info->data.uncheckedAppend(WTFMove(segment)); |
| continue; |
| } |
| |
| const uint32_t dataFlag = memoryIndexOrDataFlag; |
| if (dataFlag == 0x01) { |
| uint32_t dataByteLength; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(dataByteLength), "can't get ", segmentNumber, "th Data segment's data byte length"); |
| WASM_PARSER_FAIL_IF(dataByteLength > maxModuleSize, segmentNumber, "th Data segment's data byte length is too big ", dataByteLength, " maximum ", maxModuleSize); |
| |
| auto segment = Segment::create(std::nullopt, dataByteLength, Segment::Kind::Passive); |
| WASM_PARSER_FAIL_IF(!segment, "can't allocate enough memory for ", segmentNumber, "th Data segment of size ", dataByteLength); |
| for (uint32_t dataByte = 0; dataByte < dataByteLength; ++dataByte) { |
| uint8_t byte; |
| WASM_PARSER_FAIL_IF(!parseUInt8(byte), "can't get ", dataByte, "th data byte from ", segmentNumber, "th Data segment"); |
| segment->byte(dataByte) = byte; |
| } |
| m_info->data.uncheckedAppend(WTFMove(segment)); |
| continue; |
| |
| } |
| |
| if (dataFlag == 0x02) { |
| uint32_t memoryIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(memoryIndex), "can't get ", segmentNumber, "th Data segment's index"); |
| WASM_PARSER_FAIL_IF(memoryIndex >= m_info->memoryCount(), segmentNumber, "th Data segment has index ", memoryIndex, " which exceeds the number of Memories ", m_info->memoryCount()); |
| |
| std::optional<I32InitExpr> initExpr; |
| WASM_FAIL_IF_HELPER_FAILS(parseI32InitExprForDataSection(initExpr)); |
| |
| uint32_t dataByteLength; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(dataByteLength), "can't get ", segmentNumber, "th Data segment's data byte length"); |
| WASM_PARSER_FAIL_IF(dataByteLength > maxModuleSize, segmentNumber, "th Data segment's data byte length is too big ", dataByteLength, " maximum ", maxModuleSize); |
| |
| auto segment = Segment::create(*initExpr, dataByteLength, Segment::Kind::Active); |
| WASM_PARSER_FAIL_IF(!segment, "can't allocate enough memory for ", segmentNumber, "th Data segment of size ", dataByteLength); |
| for (uint32_t dataByte = 0; dataByte < dataByteLength; ++dataByte) { |
| uint8_t byte; |
| WASM_PARSER_FAIL_IF(!parseUInt8(byte), "can't get ", dataByte, "th data byte from ", segmentNumber, "th Data segment"); |
| segment->byte(dataByte) = byte; |
| } |
| m_info->data.uncheckedAppend(WTFMove(segment)); |
| continue; |
| } |
| |
| WASM_PARSER_FAIL_IF(true, "unknown ", segmentNumber, "th Data segment's flag"); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseDataCount() -> PartialResult |
| { |
| uint32_t numberOfDataSegments; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(numberOfDataSegments), "can't get Data Count section's count"); |
| |
| m_info->numberOfDataSegments = numberOfDataSegments; |
| return { }; |
| } |
| |
| auto SectionParser::parseException() -> PartialResult |
| { |
| WASM_PARSER_FAIL_IF(!Options::useWebAssemblyExceptions(), "wasm exceptions are not enabled"); |
| |
| uint32_t exceptionCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(exceptionCount), "can't get Exception section's count"); |
| WASM_PARSER_FAIL_IF(exceptionCount > maxExceptions, "Export section's count is too big ", exceptionCount, " maximum ", maxExceptions); |
| WASM_PARSER_FAIL_IF(!m_info->internalExceptionSignatureIndices.tryReserveCapacity(exceptionCount), "can't allocate enough memory for ", exceptionCount, " exceptions"); |
| |
| for (uint32_t exceptionNumber = 0; exceptionNumber < exceptionCount; ++exceptionNumber) { |
| uint8_t tagType; |
| WASM_PARSER_FAIL_IF(!parseUInt8(tagType), "can't get ", exceptionNumber, "th Exception tag type"); |
| WASM_PARSER_FAIL_IF(tagType, exceptionNumber, "th Exception has tag type ", tagType, " but the only supported tag type is 0"); |
| |
| uint32_t typeNumber; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(typeNumber), "can't get ", exceptionNumber, "th Exception's type number"); |
| WASM_PARSER_FAIL_IF(typeNumber >= m_info->usedSignatures.size(), exceptionNumber, "th Exception type number is invalid ", typeNumber); |
| SignatureIndex signatureIndex = SignatureInformation::get(m_info->usedSignatures[typeNumber]); |
| m_info->internalExceptionSignatureIndices.uncheckedAppend(signatureIndex); |
| } |
| |
| return { }; |
| } |
| auto SectionParser::parseCustom() -> PartialResult |
| { |
| CustomSection section; |
| uint32_t customSectionNumber = m_info->customSections.size() + 1; |
| uint32_t nameLen; |
| WASM_PARSER_FAIL_IF(!m_info->customSections.tryReserveCapacity(customSectionNumber), "can't allocate enough memory for ", customSectionNumber, "th custom section"); |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get ", customSectionNumber, "th custom section's name length"); |
| WASM_PARSER_FAIL_IF(!consumeUTF8String(section.name, nameLen), "nameLen get ", customSectionNumber, "th custom section's name of length ", nameLen); |
| |
| uint32_t payloadBytes = length() - m_offset; |
| WASM_PARSER_FAIL_IF(!section.payload.tryReserveCapacity(payloadBytes), "can't allocate enough memory for ", customSectionNumber, "th custom section's ", payloadBytes, " bytes"); |
| for (uint32_t byteNumber = 0; byteNumber < payloadBytes; ++byteNumber) { |
| uint8_t byte; |
| WASM_PARSER_FAIL_IF(!parseUInt8(byte), "can't get ", byteNumber, "th data byte from ", customSectionNumber, "th custom section"); |
| section.payload.uncheckedAppend(byte); |
| } |
| |
| Name nameName = { 'n', 'a', 'm', 'e' }; |
| if (section.name == nameName) { |
| NameSectionParser nameSectionParser(section.payload.begin(), section.payload.size(), m_info); |
| if (auto nameSection = nameSectionParser.parse()) |
| m_info->nameSection = WTFMove(*nameSection); |
| } |
| |
| m_info->customSections.uncheckedAppend(WTFMove(section)); |
| |
| return { }; |
| } |
| |
| } } // namespace JSC::Wasm |
| |
| #endif // ENABLE(WEBASSEMBLY) |
