| /* |
| * Copyright (C) 2016-2023 Apple Inc. All rights reserved. |
| * Copyright (C) 2018 Yusuke Suzuki <[email protected]>. |
| * |
| * 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 "WasmBranchHintsSectionParser.h" |
| #include "WasmConstExprGenerator.h" |
| #include "WasmMemoryInformation.h" |
| #include "WasmNameSectionParser.h" |
| #include "WasmOps.h" |
| #include "WasmSIMDOpcodes.h" |
| #include "WasmSourceMappingURLSectionParser.h" |
| #include "WasmTypeDefinitionInlines.h" |
| #include <wtf/HexNumber.h> |
| #include <wtf/SetForScope.h> |
| #include <wtf/text/MakeString.h> |
| |
| namespace JSC { namespace Wasm { |
| |
| auto SectionParser::parseType() -> PartialResult |
| { |
| uint32_t count; |
| uint32_t recursionGroupCount = 0; |
| |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get Type section's count"_s); |
| WASM_PARSER_FAIL_IF(count > maxTypes, "Type section's count is too big "_s, count, " maximum "_s, maxTypes); |
| RELEASE_ASSERT(!m_info->typeSignatures.capacity()); |
| RELEASE_ASSERT(!m_info->rtts.capacity()); |
| WASM_ALLOCATOR_FAIL_IF(!m_info->typeSignatures.tryReserveInitialCapacity(count), "can't allocate enough memory for Type section's "_s, count, " entries"_s); |
| WASM_ALLOCATOR_FAIL_IF(!m_info->rtts.tryReserveInitialCapacity(count), "can't allocate enough memory for Type section's "_s, count, " canonical RTT entries"_s); |
| |
| for (uint32_t i = 0; i < count; ++i) { |
| int8_t typeKind; |
| WASM_PARSER_FAIL_IF(!parseInt7(typeKind), "can't get "_s, i, "th Type's type"_s); |
| RefPtr<TypeDefinition> signature; |
| |
| // When GC is enabled, recursive references can show up in any of these cases. |
| SetForScope<RecursionGroupInformation> recursionGroupInfo(m_recursionGroupInformation, RecursionGroupInformation { true, m_info->typeCount(), m_info->typeCount() + 1 }); |
| |
| switch (static_cast<TypeKind>(typeKind)) { |
| case TypeKind::Func: { |
| WASM_FAIL_IF_HELPER_FAILS(parseFunctionType(i, signature)); |
| break; |
| } |
| case TypeKind::Struct: { |
| WASM_FAIL_IF_HELPER_FAILS(parseStructType(i, signature)); |
| break; |
| } |
| case TypeKind::Array: { |
| WASM_FAIL_IF_HELPER_FAILS(parseArrayType(i, signature)); |
| break; |
| } |
| case TypeKind::Rec: { |
| WASM_FAIL_IF_HELPER_FAILS(parseRecursionGroup(i, signature)); |
| ++recursionGroupCount; |
| WASM_PARSER_FAIL_IF(recursionGroupCount > maxNumberOfRecursionGroups, "number of recursion groups exceeded the limit of "_s, maxNumberOfRecursionGroups); |
| break; |
| } |
| case TypeKind::Sub: |
| case TypeKind::Subfinal: { |
| Vector<TypeIndex> empty; |
| WASM_FAIL_IF_HELPER_FAILS(parseSubtype(i, signature, empty, static_cast<TypeKind>(typeKind) == TypeKind::Subfinal)); |
| break; |
| } |
| default: |
| return fail(i, "th Type is non-Func, non-Struct, and non-Array ", typeKind); |
| } |
| |
| WASM_PARSER_FAIL_IF(!signature, "can't allocate enough memory for Type section's "_s, i, "th signature"_s); |
| |
| // When GC is enabled, type definitions that appear on their own are shorthand |
| // notations for recursion groups with one type. Here we ensure that if such a |
| // shorthand type is actually recursive, it is represented with a recursion group. |
| // Subtyping checks are also done here to ensure sub types are subtypes of their parents. |
| // Recursion group parsing will append the entries itself, as there may |
| // be multiple entries that need to be added to the type section for |
| // each recursion group. |
| if (signature->is<RecursionGroup>()) |
| m_info->recursionGroups.append(signature.releaseNonNull()); |
| else { |
| if (signature->hasRecursiveReference()) { |
| Vector<TypeIndex> types; |
| bool result = types.tryAppend(signature->index()); |
| WASM_PARSER_FAIL_IF(!result, "can't allocate enough memory for Type section's "_s, i, "th signature"_s); |
| // group takes ownership of signature via types, and projection takes ownership of group. |
| RefPtr<TypeDefinition> group = TypeInformation::typeDefinitionForRecursionGroup(types); |
| RefPtr<TypeDefinition> projection = TypeInformation::typeDefinitionForProjection(group->index(), 0); |
| signature = WTFMove(projection); |
| } |
| TypeInformation::registerCanonicalRTTForType(signature->index()); |
| m_info->rtts.append(TypeInformation::getCanonicalRTT(signature->index())); |
| const TypeDefinition& unrolled = signature->unroll(); |
| if (unrolled.is<Subtype>()) { |
| WASM_PARSER_FAIL_IF(m_info->rtts.last()->displaySizeExcludingThis() > maxSubtypeDepth, "subtype depth for Type section's "_s, i, "th signature exceeded the limits of "_s, maxSubtypeDepth); |
| WASM_FAIL_IF_HELPER_FAILS(checkSubtypeValidity(unrolled)); |
| } |
| m_info->typeSignatures.append(signature.releaseNonNull()); |
| } |
| } |
| |
| RELEASE_ASSERT(m_info->typeSignatures.size() == m_info->rtts.size()); |
| return { }; |
| } |
| |
| auto SectionParser::parseImport() -> PartialResult |
| { |
| uint32_t importCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(importCount), "can't get Import section's count"_s); |
| WASM_PARSER_FAIL_IF(importCount > maxImports, "Import section's count is too big "_s, importCount, " maximum "_s, maxImports); |
| RELEASE_ASSERT(!m_info->globals.capacity()); |
| RELEASE_ASSERT(!m_info->imports.capacity()); |
| RELEASE_ASSERT(!m_info->importFunctionTypeIndices.capacity()); |
| RELEASE_ASSERT(!m_info->importExceptionTypeIndices.capacity()); |
| WASM_ALLOCATOR_FAIL_IF(!m_info->globals.tryReserveInitialCapacity(importCount), "can't allocate enough memory for "_s, importCount, " globals"_s); // FIXME this over-allocates when we fix the FIXMEs below. |
| WASM_ALLOCATOR_FAIL_IF(!m_info->imports.tryReserveInitialCapacity(importCount), "can't allocate enough memory for "_s, importCount, " imports"_s); // FIXME this over-allocates when we fix the FIXMEs below. |
| WASM_ALLOCATOR_FAIL_IF(!m_info->importFunctionTypeIndices.tryReserveInitialCapacity(importCount), "can't allocate enough memory for "_s, importCount, " import function signatures"_s); // FIXME this over-allocates when we fix the FIXMEs below. |
| WASM_ALLOCATOR_FAIL_IF(!m_info->importExceptionTypeIndices.tryReserveInitialCapacity(importCount), "can't allocate enough memory for "_s, importCount, " import exception signatures"_s); // 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 "_s, importNumber, "th Import's module name length"_s); |
| WASM_ALLOCATOR_FAIL_IF(!consumeUTF8String(moduleString, moduleLen), "can't get "_s, importNumber, "th Import's module name of length "_s, moduleLen); |
| |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(fieldLen), "can't get "_s, importNumber, "th Import's field name length in module '"_s, moduleString, "'"_s); |
| WASM_ALLOCATOR_FAIL_IF(!consumeUTF8String(fieldString, fieldLen), "can't get "_s, importNumber, "th Import's field name of length "_s, moduleLen, " in module '"_s, moduleString, "'"_s); |
| |
| WASM_PARSER_FAIL_IF(!parseExternalKind(kind), "can't get "_s, importNumber, "th Import's kind in module '"_s, moduleString, "' field '"_s, fieldString, "'"_s); |
| switch (kind) { |
| case ExternalKind::Function: { |
| uint32_t functionTypeIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(functionTypeIndex), "can't get "_s, importNumber, "th Import's function signature in module '"_s, moduleString, "' field '"_s, fieldString, "'"_s); |
| WASM_PARSER_FAIL_IF(functionTypeIndex >= m_info->typeCount(), "invalid function signature for "_s, importNumber, "th Import, "_s, functionTypeIndex, " is out of range of "_s, m_info->typeCount(), " in module '"_s, moduleString, "' field '"_s, fieldString, "'"_s); |
| kindIndex = m_info->importFunctionTypeIndices.size(); |
| TypeIndex typeIndex = TypeInformation::get(m_info->typeSignatures[functionTypeIndex]); |
| auto signature = TypeInformation::tryGetFunctionSignature(typeIndex); |
| WASM_PARSER_FAIL_IF(!signature.has_value(), importNumber, "th Function type "_s, functionTypeIndex, " doesn't have a function signature"_s); |
| m_info->importFunctionTypeIndices.append(typeIndex); |
| break; |
| } |
| case ExternalKind::Table: { |
| bool isImport = true; |
| kindIndex = m_info->tables.size(); |
| PartialResult result = parseTableHelper(isImport); |
| if (!result) [[unlikely]] |
| return makeUnexpected(WTFMove(result.error())); |
| break; |
| } |
| case ExternalKind::Memory: { |
| bool isImport = true; |
| PartialResult result = parseMemoryHelper(isImport); |
| if (!result) [[unlikely]] |
| 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 == Mutability::Mutable) |
| global.bindingMode = GlobalInformation::BindingMode::Portable; |
| kindIndex = m_info->globals.size(); |
| m_info->globals.append(WTFMove(global)); |
| break; |
| } |
| case ExternalKind::Exception: { |
| uint8_t tagType; |
| WASM_PARSER_FAIL_IF(!parseUInt8(tagType), "can't get "_s, importNumber, "th Import exception's tag type"_s); |
| WASM_PARSER_FAIL_IF(tagType, importNumber, "th Import exception has tag type "_s, tagType, " but the only supported tag type is 0"_s); |
| |
| uint32_t exceptionSignatureIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(exceptionSignatureIndex), "can't get "_s, importNumber, "th Import's exception signature in module '"_s, moduleString, "' field '"_s, fieldString, "'"_s); |
| WASM_PARSER_FAIL_IF(exceptionSignatureIndex >= m_info->typeCount(), "invalid exception signature for "_s, importNumber, "th Import, "_s, exceptionSignatureIndex, " is out of range of "_s, m_info->typeCount(), " in module '"_s, moduleString, "' field '"_s, fieldString, "'"_s); |
| kindIndex = m_info->importExceptionTypeIndices.size(); |
| TypeIndex typeIndex = TypeInformation::get(m_info->typeSignatures[exceptionSignatureIndex]); |
| auto signature = TypeInformation::tryGetFunctionSignature(typeIndex); |
| WASM_PARSER_FAIL_IF(!signature.has_value(), importNumber, "th Exception type "_s, exceptionSignatureIndex, " doesn't have a function signature"_s); |
| WASM_PARSER_FAIL_IF(!signature.value()->returnsVoid(), importNumber, "th Exception type cannot have a non-void return type "_s, exceptionSignatureIndex); |
| m_info->importExceptionTypeIndices.append(typeIndex); |
| break; |
| } |
| } |
| |
| m_info->imports.append({ 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"_s); |
| WASM_PARSER_FAIL_IF(count > maxFunctions, "Function section's count is too big "_s, count, " maximum "_s, maxFunctions); |
| RELEASE_ASSERT(!m_info->internalFunctionTypeIndices.capacity()); |
| RELEASE_ASSERT(!m_info->functions.capacity()); |
| WASM_ALLOCATOR_FAIL_IF(!m_info->internalFunctionTypeIndices.tryReserveInitialCapacity(count), "can't allocate enough memory for "_s, count, " Function signatures"_s); |
| WASM_ALLOCATOR_FAIL_IF(!m_info->functions.tryReserveInitialCapacity(count), "can't allocate enough memory for "_s, count, "Function locations"_s); |
| |
| for (uint32_t i = 0; i < count; ++i) { |
| uint32_t typeNumber; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(typeNumber), "can't get "_s, i, "th Function's type number"_s); |
| WASM_PARSER_FAIL_IF(typeNumber >= m_info->typeCount(), i, "th Function type number is invalid "_s, typeNumber); |
| |
| TypeIndex typeIndex = TypeInformation::get(m_info->typeSignatures[typeNumber]); |
| auto signature = TypeInformation::tryGetFunctionSignature(typeIndex); |
| // The Code section fixes up start and end. |
| size_t start = 0; |
| size_t end = 0; |
| WASM_PARSER_FAIL_IF(!signature.has_value(), i, "th Function type "_s, typeNumber, " doesn't have a function signature"_s); |
| m_info->internalFunctionTypeIndices.append(typeIndex); |
| m_info->functions.append({ start, end, Vector<uint8_t>() }); |
| } |
| |
| // Note that `initializeFunctionTrackers` should only be used after both parseImport and parseFunction |
| // finish updating importFunctionTypeIndices and internalFunctionTypeIndices. |
| m_info->initializeFunctionTrackers(); |
| return { }; |
| } |
| |
| static bool limitsFlagIsValid(uint8_t flags) |
| { |
| constexpr uint8_t invalidFlagsMask = ~0x07; |
| const uint8_t hasInvalidFlags = flags & invalidFlagsMask; |
| return !hasInvalidFlags; |
| } |
| |
| template <SectionParser::LimitsType LimitType> |
| auto SectionParser::parseResizableLimits(uint64_t& initial, std::optional<uint64_t>& maximum, bool& isShared, bool& is64bit) -> PartialResult |
| { |
| ASSERT(!maximum); |
| |
| uint8_t flags; |
| constexpr uint8_t hasMaxMask = 1; |
| constexpr uint8_t isSharedMask = 1 << 1; |
| constexpr uint8_t is64bitMask = 1 << 2; |
| |
| WASM_PARSER_FAIL_IF(!parseUInt8(flags), "can't parse resizable limits flags"_s); |
| WASM_PARSER_FAIL_IF(!limitsFlagIsValid(flags), "resizable limits flag are not valid "_s, hex(flags, 2, Lowercase)); |
| if constexpr (LimitType != LimitsType::Memory) |
| WASM_PARSER_FAIL_IF(flags & isSharedMask, "can't use shared limits for non memory"_s); |
| |
| isShared = flags & isSharedMask; |
| is64bit = flags & is64bitMask; |
| WASM_PARSER_FAIL_IF(isShared && !Options::useWasmFaultSignalHandler(), "shared memory is not enabled"_s); |
| WASM_PARSER_FAIL_IF(is64bit && !Options::useWasmMemory64(), "Memory64 is not enabled"_s); |
| |
| if (is64bit) |
| WASM_PARSER_FAIL_IF(!parseVarUInt64(initial), "can't parse resizable limits initial page count"_s); |
| else { |
| uint32_t initial32; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(initial32), "can't parse resizable limits initial page count"_s); |
| initial = initial32; |
| } |
| |
| if (flags & hasMaxMask) { |
| if (is64bit) { |
| uint64_t maximumInt; |
| WASM_PARSER_FAIL_IF(!parseVarUInt64(maximumInt), "can't parse resizable limits maximum page count"_s); |
| WASM_PARSER_FAIL_IF(initial > maximumInt, "resizable limits has an initial page count of "_s, initial, " which is greater than its maximum "_s, maximumInt); |
| maximum = maximumInt; |
| } else { |
| uint32_t maximumInt; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(maximumInt), "can't parse resizable limits maximum page count"_s); |
| WASM_PARSER_FAIL_IF(initial > maximumInt, "resizable limits has an initial page count of "_s, initial, " which is greater than its maximum "_s, maximumInt); |
| maximum = maximumInt; |
| } |
| } |
| |
| WASM_PARSER_FAIL_IF(isShared && !maximum, "shared memory must have a maximum size"_s); |
| return { }; |
| } |
| |
| auto SectionParser::parseTableHelper(bool isImport) -> PartialResult |
| { |
| WASM_PARSER_FAIL_IF(m_info->tableCount() >= maxTables, "Table count of "_s, m_info->tableCount(), " is too big, maximum "_s, maxTables); |
| |
| Type type; |
| bool hasInitExpr = false; |
| TableInformation::InitializationType tableInitType = TableInformation::Default; |
| uint64_t initialBitsOrImportNumber = 0; |
| |
| int8_t firstByte = 0; |
| WASM_PARSER_FAIL_IF(!peekInt7(firstByte), "can't parse Table information"_s); |
| if (!isImport && static_cast<TypeKind>(firstByte) == TypeKind::Void) { |
| hasInitExpr = true; |
| m_offset++; |
| uint8_t reservedByte; |
| WASM_PARSER_FAIL_IF(!parseUInt8(reservedByte) || reservedByte, "can't parse explicitly initialized Table's reserved byte"_s); |
| } |
| |
| WASM_PARSER_FAIL_IF(!parseValueType(m_info, type), "can't parse Table type"_s); |
| WASM_PARSER_FAIL_IF(!isRefType(type), "Table type should be a ref type, got "_s, type); |
| if (!hasInitExpr && !isImport) |
| WASM_PARSER_FAIL_IF(!isDefaultableType(type), "Table's type must be defaultable"_s); |
| |
| uint64_t initial; |
| std::optional<uint64_t> maximum; |
| bool isShared = false; |
| bool isTable64; |
| PartialResult limits = parseResizableLimits<LimitsType::Table>(initial, maximum, isShared, isTable64); |
| ASSERT(!isShared); |
| if (!limits) [[unlikely]] |
| return makeUnexpected(WTFMove(limits.error())); |
| WASM_PARSER_FAIL_IF(initial > maxTableEntries, "Table's initial page count of "_s, initial, " is too big, maximum "_s, maxTableEntries); |
| |
| ASSERT(!maximum || *maximum >= initial); |
| |
| if (hasInitExpr) { |
| uint8_t initOpcode; |
| Type typeForInitOpcode; |
| bool isExtendedConstantExpression; |
| v128_t unusedVector { }; |
| WASM_FAIL_IF_HELPER_FAILS(parseInitExpr(initOpcode, isExtendedConstantExpression, initialBitsOrImportNumber, unusedVector, type, typeForInitOpcode)); |
| WASM_PARSER_FAIL_IF(!isSubtype(typeForInitOpcode, type), "Table init_expr opcode of type "_s, typeForInitOpcode.kind, " doesn't match table's type "_s, type.kind); |
| |
| if (isExtendedConstantExpression) |
| tableInitType = TableInformation::FromExtendedExpression; |
| else if (initOpcode == GetGlobal) |
| tableInitType = TableInformation::FromGlobalImport; |
| else if (initOpcode == RefFunc) |
| tableInitType = TableInformation::FromRefFunc; |
| else if (initOpcode == RefNull) |
| tableInitType = TableInformation::FromRefNull; |
| else |
| RELEASE_ASSERT_NOT_REACHED(); |
| } |
| |
| TableElementType tableType = isSubtype(type, funcrefType()) ? TableElementType::Funcref : TableElementType::Externref; |
| m_info->tables.append(TableInformation(initial, maximum, isImport, tableType, type, tableInitType, initialBitsOrImportNumber)); |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseTable() -> PartialResult |
| { |
| uint32_t count; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't get Table's count"_s); |
| |
| for (unsigned i = 0; i < count; ++i) { |
| bool isImport = false; |
| PartialResult result = parseTableHelper(isImport); |
| if (!result) [[unlikely]] |
| 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"_s); |
| |
| PageCount initialPageCount; |
| PageCount maximumPageCount; |
| bool isShared { false }; |
| bool isMemory64 { false }; |
| { |
| uint64_t initial; |
| std::optional<uint64_t> maximum; |
| PartialResult limits = parseResizableLimits<LimitsType::Memory>(initial, maximum, isShared, isMemory64); |
| if (!limits) [[unlikely]] |
| return makeUnexpected(WTFMove(limits.error())); |
| ASSERT(!maximum || *maximum >= initial); |
| WASM_PARSER_FAIL_IF(!PageCount::isValid(initial), "Memory's initial page count of "_s, initial, " is invalid"_s); |
| |
| initialPageCount = PageCount(initial); |
| |
| if (maximum) { |
| WASM_PARSER_FAIL_IF(!PageCount::isValid(*maximum), "Memory's maximum page count of "_s, *maximum, " is invalid"_s); |
| maximumPageCount = PageCount(*maximum); |
| } |
| } |
| ASSERT(initialPageCount); |
| ASSERT(!maximumPageCount || maximumPageCount >= initialPageCount); |
| |
| m_info->memory = MemoryInformation(initialPageCount, maximumPageCount, isShared, isImport, isMemory64); |
| return { }; |
| } |
| |
| auto SectionParser::parseMemory() -> PartialResult |
| { |
| uint32_t count; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(count), "can't parse Memory section's count"_s); |
| |
| if (!count) |
| return { }; |
| |
| WASM_PARSER_FAIL_IF(count != 1, "Memory section has more than one memory, WebAssembly currently only allows zero or one"_s); |
| |
| 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"_s); |
| WASM_PARSER_FAIL_IF(globalCount > maxGlobals, "Global section's count is too big "_s, globalCount, " maximum "_s, maxGlobals); |
| size_t totalGlobals = globalCount + m_info->firstInternalGlobal; |
| ASSERT(m_info->firstInternalGlobal == m_info->globals.size()); |
| WASM_PARSER_FAIL_IF(!m_info->globals.tryGrowCapacityBy(globalCount), "can't allocate memory for "_s, totalGlobals, " globals"_s); |
| |
| for (uint32_t globalIndex = 0; globalIndex < globalCount; ++globalIndex) { |
| GlobalInformation global; |
| uint8_t initOpcode; |
| v128_t initVector { }; |
| uint64_t initialBitsOrImportNumber = 0; |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseGlobalType(global)); |
| Type typeForInitOpcode; |
| bool isExtendedConstantExpression; |
| WASM_FAIL_IF_HELPER_FAILS(parseInitExpr(initOpcode, isExtendedConstantExpression, initialBitsOrImportNumber, initVector, global.type, typeForInitOpcode)); |
| if (initOpcode == ExtSIMD && !isExtendedConstantExpression) { |
| RELEASE_ASSERT(typeForInitOpcode.isV128()); |
| global.initialBits.initialVector = initVector; |
| } else |
| global.initialBits.initialBitsOrImportNumber = initialBitsOrImportNumber; |
| |
| if (isExtendedConstantExpression) |
| global.initializationType = GlobalInformation::FromExtendedExpression; |
| else 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 "_s, typeForInitOpcode.kind, " doesn't match global's type "_s, global.type.kind); |
| |
| if (initOpcode == RefFunc) { |
| ASSERT(global.initializationType != GlobalInformation::FromVector); |
| m_info->addDeclaredFunction(FunctionSpaceIndex(global.initialBits.initialBitsOrImportNumber)); |
| } |
| |
| m_info->globals.append(WTFMove(global)); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseExport() -> PartialResult |
| { |
| uint32_t exportCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(exportCount), "can't get Export section's count"_s); |
| WASM_PARSER_FAIL_IF(exportCount > maxExports, "Export section's count is too big "_s, exportCount, " maximum "_s, maxExports); |
| RELEASE_ASSERT(!m_info->exports.capacity()); |
| WASM_ALLOCATOR_FAIL_IF(!m_info->exports.tryReserveInitialCapacity(exportCount), "can't allocate enough memory for "_s, exportCount, " exports"_s); |
| |
| UncheckedKeyHashSet<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 "_s, exportNumber, "th Export's field name length"_s); |
| WASM_ALLOCATOR_FAIL_IF(!consumeUTF8String(fieldString, fieldLen), "can't get "_s, exportNumber, "th Export's field name of length "_s, fieldLen); |
| String fieldName = WTF::makeString(fieldString); |
| WASM_PARSER_FAIL_IF(exportNames.contains(fieldName), "duplicate export: '"_s, fieldString, "'"_s); |
| exportNames.add(fieldName); |
| |
| WASM_PARSER_FAIL_IF(!parseExternalKind(kind), "can't get "_s, exportNumber, "th Export's kind, named '"_s, fieldString, "'"_s); |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(kindIndex), "can't get "_s, exportNumber, "th Export's kind index, named '"_s, fieldString, "'"_s); |
| switch (kind) { |
| case ExternalKind::Function: { |
| WASM_PARSER_FAIL_IF(kindIndex >= m_info->functionIndexSpaceSize(), exportNumber, "th Export has invalid function number "_s, kindIndex, " it exceeds the function index space "_s, m_info->functionIndexSpaceSize(), ", named '"_s, fieldString, "'"_s); |
| m_info->addDeclaredFunction(FunctionSpaceIndex(kindIndex)); |
| break; |
| } |
| case ExternalKind::Table: { |
| WASM_PARSER_FAIL_IF(kindIndex >= m_info->tableCount(), "can't export Table "_s, kindIndex, " there are "_s, m_info->tableCount(), " Tables"_s); |
| break; |
| } |
| case ExternalKind::Memory: { |
| WASM_PARSER_FAIL_IF(!m_info->memory, "can't export a non-existent Memory"_s); |
| WASM_PARSER_FAIL_IF(kindIndex, "can't export Memory "_s, kindIndex, " only one Table is currently supported"_s); |
| break; |
| } |
| case ExternalKind::Global: { |
| WASM_PARSER_FAIL_IF(kindIndex >= m_info->globals.size(), exportNumber, "th Export has invalid global number "_s, kindIndex, " it exceeds the globals count "_s, m_info->globals.size(), ", named '"_s, fieldString, "'"_s); |
| // Only mutable globals need floating bindings. |
| GlobalInformation& global = m_info->globals[kindIndex]; |
| if (global.mutability == Mutability::Mutable) |
| global.bindingMode = GlobalInformation::BindingMode::Portable; |
| break; |
| } |
| case ExternalKind::Exception: { |
| WASM_PARSER_FAIL_IF(kindIndex >= m_info->exceptionIndexSpaceSize(), exportNumber, "th Export has invalid exception number "_s, kindIndex, " it exceeds the exception index space "_s, m_info->exceptionIndexSpaceSize(), ", named '"_s, fieldString, "'"_s); |
| m_info->addDeclaredException(kindIndex); |
| break; |
| } |
| } |
| |
| m_info->exports.append({ WTFMove(fieldString), kind, kindIndex }); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseStart() -> PartialResult |
| { |
| uint32_t startFunctionIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(startFunctionIndex), "can't get Start index"_s); |
| WASM_PARSER_FAIL_IF(startFunctionIndex >= m_info->functionIndexSpaceSize(), "Start index "_s, startFunctionIndex, " exceeds function index space "_s, m_info->functionIndexSpaceSize()); |
| TypeIndex typeIndex = m_info->typeIndexFromFunctionIndexSpace(FunctionSpaceIndex(startFunctionIndex)); |
| auto signature = TypeInformation::tryGetFunctionSignature(typeIndex); |
| WASM_PARSER_FAIL_IF(!signature.has_value(), "can't get Start function signature"_s); |
| WASM_PARSER_FAIL_IF(signature.value()->argumentCount(), "Start function can't have arguments"_s); |
| WASM_PARSER_FAIL_IF(!signature.value()->returnsVoid(), "Start function can't return a value"_s); |
| 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"_s); |
| WASM_PARSER_FAIL_IF(elementCount > maxTableEntries, "Element section's count is too big "_s, elementCount, " maximum "_s, maxTableEntries); |
| RELEASE_ASSERT(!m_info->elements.capacity()); |
| WASM_ALLOCATOR_FAIL_IF(!m_info->elements.tryReserveInitialCapacity(elementCount), "can't allocate memory for "_s, elementCount, " Elements"_s); |
| for (unsigned elementNum = 0; elementNum < elementCount; ++elementNum) { |
| uint32_t elementFlags; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(elementFlags), "can't get "_s, elementNum, "th Element reserved byte, which should be element flags"_s); |
| |
| switch (elementFlags) { |
| case 0x00: { |
| constexpr uint32_t tableIndex = 0; |
| WASM_FAIL_IF_HELPER_FAILS(validateElementTableIdx(tableIndex, nonNullFuncrefType())); |
| |
| 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, nonNullFuncrefType(), tableIndex, WTFMove(initExpr)); |
| WASM_ALLOCATOR_FAIL_IF(!element.initTypes.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| WASM_ALLOCATOR_FAIL_IF(!element.initialBitsOrIndices.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfIndexes(element.initTypes, element.initialBitsOrIndices, indexCount, elementNum)); |
| m_info->elements.append(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, nonNullFuncrefType()); |
| WASM_ALLOCATOR_FAIL_IF(!element.initTypes.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| WASM_ALLOCATOR_FAIL_IF(!element.initialBitsOrIndices.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfIndexes(element.initTypes, element.initialBitsOrIndices, indexCount, elementNum)); |
| m_info->elements.append(WTFMove(element)); |
| break; |
| } |
| case 0x02: { |
| uint32_t tableIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(tableIndex), "can't get "_s, elementNum, "th Element table index"_s); |
| WASM_FAIL_IF_HELPER_FAILS(validateElementTableIdx(tableIndex, nonNullFuncrefType())); |
| |
| 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, nonNullFuncrefType(), tableIndex, WTFMove(initExpr)); |
| WASM_ALLOCATOR_FAIL_IF(!element.initTypes.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| WASM_ALLOCATOR_FAIL_IF(!element.initialBitsOrIndices.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfIndexes(element.initTypes, element.initialBitsOrIndices, indexCount, elementNum)); |
| m_info->elements.append(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, nonNullFuncrefType()); |
| WASM_ALLOCATOR_FAIL_IF(!element.initTypes.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| WASM_ALLOCATOR_FAIL_IF(!element.initialBitsOrIndices.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfIndexes(element.initTypes, element.initialBitsOrIndices, indexCount, elementNum)); |
| m_info->elements.append(WTFMove(element)); |
| break; |
| } |
| case 0x04: { |
| constexpr uint32_t tableIndex = 0; |
| WASM_FAIL_IF_HELPER_FAILS(validateElementTableIdx(tableIndex, funcrefType())); |
| |
| 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, funcrefType(), tableIndex, WTFMove(initExpr)); |
| WASM_ALLOCATOR_FAIL_IF(!element.initTypes.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| WASM_ALLOCATOR_FAIL_IF(!element.initialBitsOrIndices.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfExpressions(funcrefType(), element.initTypes, element.initialBitsOrIndices, indexCount, elementNum)); |
| m_info->elements.append(WTFMove(element)); |
| break; |
| } |
| case 0x05: { |
| Type refType; |
| WASM_PARSER_FAIL_IF(!parseRefType(m_info, refType), "can't parse reftype in elem section"_s); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| |
| Element element(Element::Kind::Passive, refType); |
| WASM_ALLOCATOR_FAIL_IF(!element.initTypes.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| WASM_ALLOCATOR_FAIL_IF(!element.initialBitsOrIndices.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfExpressions(refType, element.initTypes, element.initialBitsOrIndices, indexCount, elementNum)); |
| m_info->elements.append(WTFMove(element)); |
| break; |
| } |
| case 0x06: { |
| uint32_t tableIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(tableIndex), "can't get "_s, elementNum, "th Element table index"_s); |
| |
| 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"_s); |
| WASM_FAIL_IF_HELPER_FAILS(validateElementTableIdx(tableIndex, refType)); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| ASSERT(!!m_info->tables[tableIndex]); |
| |
| Element element(Element::Kind::Active, refType, tableIndex, WTFMove(initExpr)); |
| WASM_ALLOCATOR_FAIL_IF(!element.initTypes.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| WASM_ALLOCATOR_FAIL_IF(!element.initialBitsOrIndices.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfExpressions(refType, element.initTypes, element.initialBitsOrIndices, indexCount, elementNum)); |
| m_info->elements.append(WTFMove(element)); |
| break; |
| } |
| case 0x07: { |
| Type refType; |
| WASM_PARSER_FAIL_IF(!parseRefType(m_info, refType), "can't parse reftype in elem section"_s); |
| |
| uint32_t indexCount; |
| WASM_FAIL_IF_HELPER_FAILS(parseIndexCountForElementSection(indexCount, elementNum)); |
| |
| Element element(Element::Kind::Declared, refType); |
| WASM_ALLOCATOR_FAIL_IF(!element.initTypes.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| WASM_ALLOCATOR_FAIL_IF(!element.initialBitsOrIndices.tryReserveInitialCapacity(indexCount), "can't allocate memory for "_s, indexCount, " Element init_exprs"_s); |
| |
| WASM_FAIL_IF_HELPER_FAILS(parseElementSegmentVectorOfExpressions(refType, element.initTypes, element.initialBitsOrIndices, indexCount, elementNum)); |
| m_info->elements.append(WTFMove(element)); |
| break; |
| } |
| default: |
| WASM_PARSER_FAIL_IF(true, "can't get "_s, elementNum, "th Element reserved byte"_s); |
| } |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseCode() -> PartialResult |
| { |
| // The Code section is handled specially in StreamingParser. |
| RELEASE_ASSERT_NOT_REACHED(); |
| return { }; |
| } |
| |
| auto SectionParser::parseInitExpr(uint8_t& opcode, bool& isExtendedConstantExpression, uint64_t& bitsOrImportNumber, v128_t& vectorBits, Type expectedType, Type& resultType) -> PartialResult |
| { |
| size_t initialOffset = m_offset; |
| WASM_PARSER_FAIL_IF(!parseUInt8(opcode), "can't get init_expr's opcode"_s); |
| |
| switch (opcode) { |
| case I32Const: { |
| int32_t constant; |
| WASM_PARSER_FAIL_IF(!parseVarInt32(constant), "can't get constant value for init_expr's i32.const"_s); |
| 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"_s); |
| 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"_s); |
| 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"_s); |
| bitsOrImportNumber = constant; |
| resultType = Types::F64; |
| break; |
| } |
| |
| #if ENABLE(B3_JIT) |
| case ExtSIMD: { |
| WASM_PARSER_FAIL_IF(!Options::useWasmSIMD(), "SIMD must be enabled"_s); |
| uint8_t simdOpcode; |
| WASM_PARSER_FAIL_IF(!parseUInt8(simdOpcode), "can't get init_expr's simd opcode"_s); |
| WASM_PARSER_FAIL_IF(static_cast<ExtSIMDOpType>(simdOpcode) != ExtSIMDOpType::V128Const, "unknown init_expr simd opcode "_s, opcode); |
| v128_t constant; |
| WASM_PARSER_FAIL_IF(!parseImmByteArray16(constant), "get constant value for init_expr's v128.const"_s); |
| |
| vectorBits = constant; |
| resultType = Types::V128; |
| break; |
| } |
| #else |
| case ExtSIMD: |
| WASM_PARSER_FAIL_IF(true, "wasm-simd is not supported"_s); |
| (void) vectorBits; |
| break; |
| #endif |
| |
| case GetGlobal: { |
| uint32_t index; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(index), "can't get get_global's index"_s); |
| |
| WASM_PARSER_FAIL_IF(index >= m_info->globals.size(), "get_global's index "_s, index, " exceeds the number of globals "_s, m_info->globals.size()); |
| WASM_PARSER_FAIL_IF(m_info->globals[index].mutability != Mutability::Immutable, "get_global import kind index "_s, index, " is mutable "_s); |
| |
| resultType = m_info->globals[index].type; |
| bitsOrImportNumber = index; |
| break; |
| } |
| |
| case RefNull: { |
| Type typeOfNull; |
| int32_t heapType; |
| WASM_PARSER_FAIL_IF(!parseHeapType(m_info, heapType), "ref.null heaptype must be funcref, externref or type_idx"_s); |
| if (isTypeIndexHeapType(heapType)) { |
| TypeIndex typeIndex = TypeInformation::get(m_info->typeSignatures[heapType].get()); |
| typeOfNull = Type { TypeKind::RefNull, typeIndex }; |
| } else |
| typeOfNull = Type { TypeKind::RefNull, static_cast<TypeIndex>(heapType) }; |
| resultType = typeOfNull; |
| bitsOrImportNumber = JSValue::encode(jsNull()); |
| break; |
| } |
| |
| case RefFunc: { |
| uint32_t index; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(index), "can't get ref.func index"_s); |
| WASM_PARSER_FAIL_IF(index >= m_info->functionIndexSpaceSize(), "ref.func index "_s, index, " exceeds the number of functions "_s, m_info->functionIndexSpaceSize()); |
| auto spaceIndex = FunctionSpaceIndex(index); |
| m_info->addReferencedFunction(spaceIndex); |
| TypeIndex typeIndex = m_info->typeIndexFromFunctionIndexSpace(spaceIndex); |
| resultType = { TypeKind::Ref, typeIndex }; |
| bitsOrImportNumber = index; |
| break; |
| } |
| |
| case ExtGC: |
| break; |
| |
| default: |
| WASM_PARSER_FAIL_IF(true, "unknown init_expr opcode "_s, opcode); |
| } |
| |
| uint8_t endOpcode; |
| // Don't consume the opcode byte unless it's an End so that the extended |
| // parsing mode below can consume it if needed. |
| WASM_PARSER_FAIL_IF(offset() >= source().size(), "can't get init_expr's end opcode"_s); |
| endOpcode = source()[offset()]; |
| |
| if (endOpcode == OpType::End && opcode != OpType::ExtGC) { |
| m_offset++; |
| isExtendedConstantExpression = false; |
| return { }; |
| } |
| |
| // If an End doesn't appear, we have to assume it's an extended constant expression |
| // and use the full Wasm expression parser to validate. |
| size_t initExprOffset; |
| WASM_FAIL_IF_HELPER_FAILS(parseExtendedConstExpr(source().subspan(initialOffset), initialOffset + m_offsetInSource, initExprOffset, m_info, expectedType)); |
| m_offset += (initExprOffset - (m_offset - initialOffset)); |
| WASM_PARSER_FAIL_IF(!m_info->constantExpressions.tryConstructAndAppend(source().subspan(initialOffset, initExprOffset)), "could not allocate memory for init expr"_s); |
| bitsOrImportNumber = m_info->constantExpressions.size() - 1; |
| isExtendedConstantExpression = true; |
| resultType = expectedType; |
| |
| return { }; |
| } |
| |
| auto SectionParser::validateElementTableIdx(uint32_t tableIndex, Type type) -> PartialResult |
| { |
| WASM_PARSER_FAIL_IF(tableIndex >= m_info->tableCount(), "Element section for Table "_s, tableIndex, " exceeds available Table "_s, m_info->tableCount()); |
| WASM_PARSER_FAIL_IF(!isSubtype(type, m_info->tables[tableIndex].wasmType()), "Table "_s, tableIndex, " must have type '"_s, type, "' to have an element section"_s); |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseI32InitExpr(std::optional<I32InitExpr>& initExpr, ASCIILiteral failMessage) -> PartialResult |
| { |
| uint8_t initOpcode; |
| bool isExtendedConstantExpression; |
| uint64_t initExprBits; |
| Type initExprType; |
| v128_t unused; |
| WASM_FAIL_IF_HELPER_FAILS(parseInitExpr(initOpcode, isExtendedConstantExpression, initExprBits, unused, Types::I32, initExprType)); |
| WASM_PARSER_FAIL_IF(!initExprType.isI32(), failMessage); |
| initExpr = makeI32InitExpr(initOpcode, isExtendedConstantExpression, initExprBits); |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseFunctionType(uint32_t position, RefPtr<TypeDefinition>& functionSignature) -> PartialResult |
| { |
| uint32_t argumentCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(argumentCount), "can't get Type's argument count at index "_s, position); |
| WASM_PARSER_FAIL_IF(argumentCount > maxFunctionParams, "argument count of Type at index "_s, position, " is too big "_s, argumentCount, " maximum "_s, maxFunctionParams); |
| Vector<Type, 16> argumentTypes; |
| WASM_ALLOCATOR_FAIL_IF(!argumentTypes.tryReserveInitialCapacity(argumentCount), "can't allocate enough memory for Type section's "_s, position, "th signature"_s); |
| |
| argumentTypes.grow(argumentCount); |
| for (unsigned i = 0; i < argumentCount; ++i) { |
| Type argumentType; |
| WASM_PARSER_FAIL_IF(!parseValueType(m_info, argumentType), "can't get "_s, i, "th argument Type"_s); |
| argumentTypes[i] = argumentType; |
| } |
| |
| uint32_t returnCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(returnCount), "can't get Type's return count at index "_s, position); |
| WASM_PARSER_FAIL_IF(returnCount > maxFunctionReturns, "return count of Type at index "_s, position, " is too big "_s, returnCount, " maximum "_s, maxFunctionReturns); |
| |
| Vector<Type, 16> returnTypes; |
| WASM_ALLOCATOR_FAIL_IF(!returnTypes.tryReserveInitialCapacity(returnCount), "can't allocate enough memory for Type section's "_s, position, "th signature"_s); |
| returnTypes.grow(returnCount); |
| for (unsigned i = 0; i < returnCount; ++i) { |
| Type value; |
| WASM_PARSER_FAIL_IF(!parseValueType(m_info, value), "can't get "_s, i, "th Type's return value"_s); |
| returnTypes[i] = value; |
| } |
| |
| functionSignature = TypeInformation::typeDefinitionForFunction(returnTypes, argumentTypes); |
| return { }; |
| } |
| |
| auto SectionParser::parsePackedType(PackedType& packedType) -> PartialResult |
| { |
| int8_t kind; |
| WASM_PARSER_FAIL_IF(!parseInt7(kind), "invalid type in struct field or array element"_s); |
| if (isValidPackedType(kind)) { |
| packedType = static_cast<PackedType>(kind); |
| return { }; |
| } |
| return fail("expected a packed type but got "_s, kind); |
| } |
| |
| auto SectionParser::parseStorageType(StorageType& storageType) -> PartialResult |
| { |
| int8_t kind; |
| WASM_PARSER_FAIL_IF(!peekInt7(kind), "invalid type in struct field or array element"_s); |
| if (isValidTypeKind(kind)) { |
| Type elementType; |
| WASM_PARSER_FAIL_IF(!parseValueType(m_info, elementType), "invalid type in struct field or array element"_s); |
| storageType = StorageType { elementType }; |
| return { }; |
| } |
| |
| PackedType elementType; |
| WASM_PARSER_FAIL_IF(!parsePackedType(elementType), "invalid type in struct field or array element"_s); |
| storageType = StorageType { elementType }; |
| return { }; |
| } |
| |
| auto SectionParser::parseStructType(uint32_t position, RefPtr<TypeDefinition>& structType) -> PartialResult |
| { |
| uint32_t fieldCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(fieldCount), "can't get "_s, position, "th struct type's field count"_s); |
| WASM_PARSER_FAIL_IF(fieldCount > maxStructFieldCount, "number of fields for struct type at position "_s, position, " is too big "_s, fieldCount, " maximum "_s, maxStructFieldCount); |
| Vector<FieldType> fields; |
| WASM_ALLOCATOR_FAIL_IF(!fields.tryReserveInitialCapacity(fieldCount), "can't allocate enough memory for struct fields "_s, fieldCount, " entries"_s); |
| fields.grow(fieldCount); |
| |
| Checked<unsigned, RecordOverflow> structInstancePayloadSize { 0 }; |
| for (uint32_t fieldIndex = 0; fieldIndex < fieldCount; ++fieldIndex) { |
| StorageType fieldType; |
| WASM_PARSER_FAIL_IF(!parseStorageType(fieldType), "can't get "_s, fieldIndex, "th field Type"_s); |
| |
| uint8_t mutability; |
| WASM_PARSER_FAIL_IF(!parseUInt8(mutability), position, "can't get "_s, fieldIndex, "th field mutability"_s); |
| WASM_PARSER_FAIL_IF(mutability != 0x0 && mutability != 0x1, "invalid Field's mutability: 0x"_s, hex(mutability, 2, Lowercase)); |
| |
| fields[fieldIndex] = FieldType { fieldType, static_cast<Mutability>(mutability) }; |
| structInstancePayloadSize += typeSizeInBytes(fieldType); |
| WASM_PARSER_FAIL_IF(structInstancePayloadSize.hasOverflowed(), "struct layout is too big"_s); |
| } |
| |
| m_info->m_hasGCObjectTypes = true; |
| structType = TypeInformation::typeDefinitionForStruct(fields); |
| return { }; |
| } |
| |
| auto SectionParser::parseArrayType(uint32_t position, RefPtr<TypeDefinition>& arrayType) -> PartialResult |
| { |
| StorageType elementType; |
| WASM_PARSER_FAIL_IF(!parseStorageType(elementType), "can't get array's element Type"_s); |
| |
| uint8_t mutability; |
| WASM_PARSER_FAIL_IF(!parseUInt8(mutability), position, "can't get array's mutability"_s); |
| WASM_PARSER_FAIL_IF(mutability != 0x0 && mutability != 0x1, "invalid array mutability: 0x"_s, hex(mutability, 2, Lowercase)); |
| |
| m_info->m_hasGCObjectTypes = true; |
| arrayType = TypeInformation::typeDefinitionForArray(FieldType { elementType, static_cast<Mutability>(mutability) }); |
| return { }; |
| } |
| |
| auto SectionParser::parseRecursionGroup(uint32_t position, RefPtr<TypeDefinition>& recursionGroup) -> PartialResult |
| { |
| uint32_t typeCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(typeCount), "can't get "_s, position, "th recursion group's type count"_s); |
| WASM_PARSER_FAIL_IF(typeCount > maxRecursionGroupCount, "number of types for recursion group at position "_s, position, " is too big "_s, typeCount, " maximum "_s, maxRecursionGroupCount); |
| Vector<TypeIndex> types; |
| WASM_ALLOCATOR_FAIL_IF(!types.tryReserveInitialCapacity(typeCount), "can't allocate enough memory for recursion group "_s, typeCount, " entries"_s); |
| Vector<Ref<TypeDefinition>> signatures; |
| WASM_ALLOCATOR_FAIL_IF(!signatures.tryReserveInitialCapacity(typeCount), "can't allocate enough memory for recursion group "_s, typeCount, " entries"_s); |
| |
| SetForScope<RecursionGroupInformation> recursionGroupInfo(m_recursionGroupInformation, RecursionGroupInformation { true, m_info->typeCount(), m_info->typeCount() + typeCount }); |
| |
| for (uint32_t i = 0; i < typeCount; ++i) { |
| int8_t typeKind; |
| WASM_PARSER_FAIL_IF(!parseInt7(typeKind), "can't get recursion group's "_s, i, "th Type's type"_s); |
| RefPtr<TypeDefinition> signature; |
| switch (static_cast<TypeKind>(typeKind)) { |
| case TypeKind::Func: { |
| WASM_FAIL_IF_HELPER_FAILS(parseFunctionType(i, signature)); |
| break; |
| } |
| case TypeKind::Struct: { |
| WASM_FAIL_IF_HELPER_FAILS(parseStructType(i, signature)); |
| break; |
| } |
| case TypeKind::Array: { |
| WASM_FAIL_IF_HELPER_FAILS(parseArrayType(i, signature)); |
| break; |
| } |
| case TypeKind::Sub: |
| case TypeKind::Subfinal: { |
| WASM_FAIL_IF_HELPER_FAILS(parseSubtype(i, signature, types, static_cast<TypeKind>(typeKind) == TypeKind::Subfinal)); |
| break; |
| } |
| default: |
| return fail(i, "th Type is non-Func, non-Struct, and non-Array "_s, typeKind); |
| } |
| |
| WASM_PARSER_FAIL_IF(!signature, "can't allocate enough memory for recursion group's "_s, i, "th signature"_s); |
| types.append(signature->index()); |
| signatures.append(signature.releaseNonNull()); |
| } |
| // Recursion group takes ownership of signatures via types. |
| recursionGroup = TypeInformation::typeDefinitionForRecursionGroup(types); |
| |
| // Type definitions are normalized such that non-recursive, singleton recursion groups |
| // are stored as the underlying concrete type without a projection. Otherwise we will |
| // store projections for each recursion group index in the type section. |
| WASM_PARSER_FAIL_IF(!m_info->typeSignatures.tryGrowCapacityBy(typeCount), "can't allocate enough memory for recursion group's "_s, typeCount, " type "_s, typeCount > 1 ? "indices"_s : "index"_s); |
| WASM_PARSER_FAIL_IF(!m_info->rtts.tryGrowCapacityBy(typeCount), "can't allocate enough memory for recursion group's "_s, typeCount, " RTT"_s, typeCount > 1 ? "s"_s : ""_s); |
| if (typeCount == 1 && !signatures[0]->hasRecursiveReference()) { |
| TypeInformation::registerCanonicalRTTForType(signatures[0]->index()); |
| m_info->rtts.append(TypeInformation::getCanonicalRTT(signatures[0]->index())); |
| if (signatures[0]->is<Subtype>()) |
| WASM_FAIL_IF_HELPER_FAILS(checkSubtypeValidity(signatures[0])); |
| m_info->typeSignatures.append(WTFMove(signatures[0])); |
| } else { |
| Vector<Ref<TypeDefinition>> projections; |
| // Take ownership of all projections before unrolling since they can refer to each other. |
| for (uint32_t i = 0; i < typeCount; ++i) { |
| RefPtr<TypeDefinition> projection = TypeInformation::typeDefinitionForProjection(recursionGroup->index(), i); |
| WASM_PARSER_FAIL_IF(!projection, "can't allocate enough memory for recursion group's "_s, i, "th projection"_s); |
| projections.append(projection.releaseNonNull()); |
| } |
| for (uint32_t i = 0; i < typeCount; ++i) { |
| TypeInformation::registerCanonicalRTTForType(projections[i]->index()); |
| m_info->rtts.append(TypeInformation::getCanonicalRTT(projections[i]->index())); |
| m_info->typeSignatures.append(projections[i]); |
| } |
| // Checking subtyping requirements has to be deferred until we construct projections in case recursive references show up in the type. |
| for (uint32_t i = 0; i < typeCount; ++i) { |
| const TypeDefinition& unrolled = projections[i]->unroll(); |
| if (unrolled.is<Subtype>()) |
| WASM_FAIL_IF_HELPER_FAILS(checkSubtypeValidity(unrolled)); |
| } |
| } |
| |
| return { }; |
| } |
| |
| // Checks subtyping between a concrete structural type and a parent type definition, |
| // following the subtyping relation described in the GC proposal specification: |
| // |
| // https://github.com/WebAssembly/gc/blob/main/proposals/gc/MVP.md#structural-types |
| // |
| // The subtype argument should be unrolled before it is passed here, if needed. |
| bool SectionParser::checkStructuralSubtype(const TypeDefinition& subtype, const TypeDefinition& supertype) |
| { |
| ASSERT(subtype.is<FunctionSignature>() || subtype.is<StructType>() || subtype.is<ArrayType>()); |
| const TypeDefinition& expanded = supertype.expand(); |
| ASSERT(expanded.is<FunctionSignature>() || expanded.is<StructType>() || expanded.is<ArrayType>()); |
| |
| if (subtype.is<FunctionSignature>() && expanded.is<FunctionSignature>()) { |
| const FunctionSignature& subFunc = *subtype.as<FunctionSignature>(); |
| const FunctionSignature& superFunc = *expanded.as<FunctionSignature>(); |
| if (subFunc.argumentCount() == superFunc.argumentCount() && subFunc.returnCount() == superFunc.returnCount()) { |
| for (FunctionArgCount i = 0; i < subFunc.argumentCount(); ++i) { |
| if (!isSubtype(superFunc.argumentType(i), subFunc.argumentType(i))) |
| return false; |
| } |
| for (FunctionArgCount i = 0; i < subFunc.returnCount(); ++i) { |
| if (!isSubtype(subFunc.returnType(i), superFunc.returnType(i))) |
| return false; |
| } |
| return true; |
| } |
| } else if (subtype.is<StructType>() && expanded.is<StructType>()) { |
| const StructType& subStruct = *subtype.as<StructType>(); |
| const StructType& superStruct = *expanded.as<StructType>(); |
| if (subStruct.fieldCount() >= superStruct.fieldCount()) { |
| for (StructFieldCount i = 0; i < superStruct.fieldCount(); ++i) { |
| FieldType subField = subStruct.field(i); |
| FieldType superField = superStruct.field(i); |
| if (subField.mutability != superField.mutability) |
| return false; |
| if (subField.mutability == Mutability::Mutable && subField.type != superField.type) |
| return false; |
| if (subField.mutability == Mutability::Immutable && !isSubtype(subField.type, superField.type)) |
| return false; |
| } |
| return true; |
| } |
| } else if (subtype.is<ArrayType>() && expanded.is<ArrayType>()) { |
| FieldType subField = subtype.as<ArrayType>()->elementType(); |
| FieldType superField = expanded.as<ArrayType>()->elementType(); |
| if (subField.mutability != superField.mutability) |
| return false; |
| if (subField.mutability == Mutability::Mutable && subField.type != superField.type) |
| return false; |
| if (subField.mutability == Mutability::Immutable && !isSubtype(subField.type, superField.type)) |
| return false; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| auto SectionParser::checkSubtypeValidity(const TypeDefinition& subtype) -> PartialResult |
| { |
| ASSERT(subtype.is<Subtype>()); |
| |
| if (subtype.as<Subtype>()->supertypeCount() < 1) |
| return { }; |
| TypeIndex superIndex = subtype.as<Subtype>()->firstSuperType(); |
| |
| const auto& superSignature = TypeInformation::get(superIndex); |
| ASSERT(!superSignature.is<Projection>() || !superSignature.as<Projection>()->isPlaceholder()); |
| |
| const TypeDefinition& supertype = superSignature.unroll(); |
| WASM_PARSER_FAIL_IF(!supertype.is<Subtype>() || supertype.as<Subtype>()->isFinal(), "cannot declare subtype of final supertype"_s); |
| WASM_PARSER_FAIL_IF(!checkStructuralSubtype(TypeInformation::get(subtype.as<Subtype>()->underlyingType()), supertype), "structural type is not a subtype of the specified supertype"_s); |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseSubtype(uint32_t position, RefPtr<TypeDefinition>& subtype, Vector<TypeIndex>& recursionGroupTypes, bool isFinal) -> PartialResult |
| { |
| uint32_t supertypeCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(supertypeCount), "can't get "_s, position, "th subtype's supertype count"_s); |
| WASM_PARSER_FAIL_IF(supertypeCount > maxSubtypeSupertypeCount, "number of supertypes for subtype at position "_s, position, " is too big "_s, supertypeCount, " maximum "_s, maxSubtypeSupertypeCount); |
| |
| // The following assumes the MVP restriction that only up to a single supertype is allowed. |
| TypeIndex supertypeIndex = TypeDefinition::invalidIndex; |
| if (supertypeCount > 0) { |
| uint32_t typeIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(typeIndex), "can't get subtype's supertype index"_s); |
| WASM_PARSER_FAIL_IF(typeIndex >= m_info->typeCount() + recursionGroupTypes.size(), "supertype index is a forward reference"_s); |
| if (typeIndex < m_info->typeCount()) |
| supertypeIndex = TypeInformation::get(m_info->typeSignatures[typeIndex]); |
| // If a parent type is in the same recursion group, the index needs to refer to the projection instead. |
| else { |
| RefPtr<TypeDefinition> projection = TypeInformation::getPlaceholderProjection(typeIndex - m_info->typeCount()); |
| supertypeIndex = projection->index(); // Placeholders are owned by TypeInformation singleton. |
| } |
| } |
| |
| int8_t typeKind; |
| WASM_PARSER_FAIL_IF(!parseInt7(typeKind), "can't get subtype's underlying Type's type"_s); |
| RefPtr<TypeDefinition> underlyingType; |
| switch (static_cast<TypeKind>(typeKind)) { |
| case TypeKind::Func: { |
| WASM_FAIL_IF_HELPER_FAILS(parseFunctionType(position, underlyingType)); |
| break; |
| } |
| case TypeKind::Struct: { |
| WASM_FAIL_IF_HELPER_FAILS(parseStructType(position, underlyingType)); |
| break; |
| } |
| case TypeKind::Array: { |
| WASM_FAIL_IF_HELPER_FAILS(parseArrayType(position, underlyingType)); |
| break; |
| } |
| default: |
| return fail("invalid structural type definition for subtype "_s, typeKind); |
| } |
| |
| // When no supertypes are specified and the type is final, we will normalize |
| // type definitions to not have the subtype. This ensures that type shorthands |
| // and the full subtype form are represented in the same way. |
| if (!supertypeCount && isFinal) { |
| subtype = underlyingType; |
| return { }; |
| } |
| |
| // Subtype takes ownership of underlyingType. |
| if (supertypeCount > 0) |
| subtype = TypeInformation::typeDefinitionForSubtype({ supertypeIndex }, TypeInformation::get(*underlyingType), isFinal); |
| else |
| subtype = TypeInformation::typeDefinitionForSubtype({ }, TypeInformation::get(*underlyingType), isFinal); |
| |
| 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"_s); |
| WASM_PARSER_FAIL_IF(!!elementKind, "element kind must be zero"_s); |
| 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 "_s, elementNum, "th index count for Element section"_s); |
| WASM_PARSER_FAIL_IF(indexCount == std::numeric_limits<uint32_t>::max(), "Element section's "_s, elementNum, "th index count is too big "_s, indexCount); |
| resultIndexCount = indexCount; |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseElementSegmentVectorOfExpressions(Type elementType, Vector<Element::InitializationType>& initTypes, Vector<uint64_t>& initialBitsOrIndices, const unsigned indexCount, const unsigned elementNum) -> PartialResult |
| { |
| for (uint32_t index = 0; index < indexCount; ++index) { |
| Element::InitializationType initType; |
| uint64_t initialBitsOrIndex; |
| |
| uint8_t initOpcode; |
| Type typeForInitOpcode; |
| bool isExtendedConstantExpression; |
| v128_t unusedVector { }; |
| WASM_FAIL_IF_HELPER_FAILS(parseInitExpr(initOpcode, isExtendedConstantExpression, initialBitsOrIndex, unusedVector, elementType, typeForInitOpcode)); |
| WASM_PARSER_FAIL_IF(!isSubtype(typeForInitOpcode, elementType), "Element section's "_s, elementNum, "th element's init_expr opcode of type "_s, typeForInitOpcode.kind, " doesn't match element's type "_s, elementType.kind); |
| |
| if (isExtendedConstantExpression) |
| initType = Element::InitializationType::FromExtendedExpression; |
| else if (initOpcode == GetGlobal) |
| initType = Element::InitializationType::FromGlobal; |
| else if (initOpcode == RefFunc) { |
| initType = Element::InitializationType::FromRefFunc; |
| m_info->addDeclaredFunction(FunctionSpaceIndex(initialBitsOrIndex)); |
| } else if (initOpcode == RefNull) |
| initType = Element::InitializationType::FromRefNull; |
| else |
| RELEASE_ASSERT_NOT_REACHED(); |
| |
| initTypes.append(initType); |
| initialBitsOrIndices.append(initialBitsOrIndex); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseElementSegmentVectorOfIndexes(Vector<Element::InitializationType>& initTypes, Vector<uint64_t>& initialBitsOrIndices, 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 "_s, elementNum, "th element's "_s, index, "th index"_s); |
| WASM_PARSER_FAIL_IF(functionIndex >= m_info->functionIndexSpaceSize(), "Element section's "_s, elementNum, "th element's "_s, index, "th index is "_s, functionIndex, " which exceeds the function index space size of "_s, m_info->functionIndexSpaceSize()); |
| |
| m_info->addDeclaredFunction(FunctionSpaceIndex(functionIndex)); |
| initTypes.append(Element::InitializationType::FromRefFunc); |
| initialBitsOrIndices.append(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"_s); |
| WASM_PARSER_FAIL_IF(!parseUInt8(mutability), "can't get Global type's mutability"_s); |
| WASM_PARSER_FAIL_IF(mutability != 0x0 && mutability != 0x1, "invalid Global's mutability: 0x"_s, hex(mutability, 2, Lowercase)); |
| global.mutability = static_cast<Mutability>(mutability); |
| return { }; |
| } |
| |
| auto SectionParser::parseData() -> PartialResult |
| { |
| uint32_t segmentCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(segmentCount), "can't get Data section's count"_s); |
| WASM_PARSER_FAIL_IF(segmentCount > maxDataSegments, "Data section's count is too big "_s, segmentCount, " maximum "_s, maxDataSegments); |
| if (m_info->numberOfDataSegments) |
| WASM_PARSER_FAIL_IF(segmentCount != m_info->numberOfDataSegments.value(), "Data section's count "_s, segmentCount, " is different from Data Count section's count "_s, m_info->numberOfDataSegments.value()); |
| RELEASE_ASSERT(!m_info->data.capacity()); |
| WASM_ALLOCATOR_FAIL_IF(!m_info->data.tryReserveInitialCapacity(segmentCount), "can't allocate enough memory for Data section's "_s, segmentCount, " segments"_s); |
| |
| for (uint32_t segmentNumber = 0; segmentNumber < segmentCount; ++segmentNumber) { |
| uint32_t memoryIndexOrDataFlag = UINT32_MAX; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(memoryIndexOrDataFlag), "can't get "_s, segmentNumber, "th Data segment's flag"_s); |
| |
| if (!memoryIndexOrDataFlag) { |
| const uint32_t memoryIndex = memoryIndexOrDataFlag; |
| WASM_PARSER_FAIL_IF(memoryIndex >= m_info->memoryCount(), segmentNumber, "th Data segment has index "_s, memoryIndex, " which exceeds the number of Memories "_s, 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 "_s, segmentNumber, "th Data segment's data byte length"_s); |
| WASM_PARSER_FAIL_IF(dataByteLength > maxModuleSize, segmentNumber, "th Data segment's data byte length is too big "_s, dataByteLength, " maximum "_s, maxModuleSize); |
| |
| auto segment = Segment::tryCreate(*initExpr, dataByteLength, Segment::Kind::Active); |
| WASM_PARSER_FAIL_IF(!segment, "can't allocate enough memory for "_s, segmentNumber, "th Data segment of size "_s, dataByteLength); |
| |
| WASM_PARSER_FAIL_IF(source().size() < dataByteLength || (source().size() - dataByteLength) < m_offset, "can't get data bytes from "_s, segmentNumber, "th Data segment"_s); |
| |
| memcpySpan(segment->span(), source().subspan(m_offset, dataByteLength)); |
| m_offset += dataByteLength; |
| m_info->data.append(WTFMove(segment)); |
| continue; |
| } |
| |
| const uint32_t dataFlag = memoryIndexOrDataFlag; |
| if (dataFlag == 0x01) { |
| uint32_t dataByteLength; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(dataByteLength), "can't get "_s, segmentNumber, "th Data segment's data byte length"_s); |
| WASM_PARSER_FAIL_IF(dataByteLength > maxModuleSize, segmentNumber, "th Data segment's data byte length is too big "_s, dataByteLength, " maximum "_s, maxModuleSize); |
| |
| auto segment = Segment::tryCreate(std::nullopt, dataByteLength, Segment::Kind::Passive); |
| WASM_PARSER_FAIL_IF(!segment, "can't allocate enough memory for "_s, segmentNumber, "th Data segment of size "_s, dataByteLength); |
| |
| WASM_PARSER_FAIL_IF(source().size() < dataByteLength || (source().size() - dataByteLength) < m_offset, "can't get data bytes from "_s, segmentNumber, "th Data segment"_s); |
| |
| memcpySpan(segment->span(), source().subspan(m_offset, dataByteLength)); |
| m_offset += dataByteLength; |
| m_info->data.append(WTFMove(segment)); |
| continue; |
| |
| } |
| |
| if (dataFlag == 0x02) { |
| uint32_t memoryIndex; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(memoryIndex), "can't get "_s, segmentNumber, "th Data segment's index"_s); |
| WASM_PARSER_FAIL_IF(memoryIndex >= m_info->memoryCount(), segmentNumber, "th Data segment has index "_s, memoryIndex, " which exceeds the number of Memories "_s, 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 "_s, segmentNumber, "th Data segment's data byte length"_s); |
| WASM_PARSER_FAIL_IF(dataByteLength > maxModuleSize, segmentNumber, "th Data segment's data byte length is too big "_s, dataByteLength, " maximum "_s, maxModuleSize); |
| |
| auto segment = Segment::tryCreate(*initExpr, dataByteLength, Segment::Kind::Active); |
| WASM_PARSER_FAIL_IF(!segment, "can't allocate enough memory for "_s, segmentNumber, "th Data segment of size "_s, dataByteLength); |
| |
| WASM_PARSER_FAIL_IF(source().size() < dataByteLength || (source().size() - dataByteLength) < m_offset, "can't get data bytes from "_s, segmentNumber, "th Data segment"_s); |
| |
| memcpySpan(segment->span(), source().subspan(m_offset, dataByteLength)); |
| m_offset += dataByteLength; |
| m_info->data.append(WTFMove(segment)); |
| continue; |
| } |
| |
| WASM_PARSER_FAIL_IF(true, "unknown "_s, segmentNumber, "th Data segment's flag"_s); |
| } |
| |
| return { }; |
| } |
| |
| auto SectionParser::parseDataCount() -> PartialResult |
| { |
| uint32_t numberOfDataSegments; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(numberOfDataSegments), "can't get Data Count section's count"_s); |
| WASM_PARSER_FAIL_IF(numberOfDataSegments > maxDataSegments, "Data Count section's count is too big "_s, numberOfDataSegments , " maximum "_s, maxDataSegments); |
| |
| m_info->numberOfDataSegments = numberOfDataSegments; |
| return { }; |
| } |
| |
| auto SectionParser::parseException() -> PartialResult |
| { |
| uint32_t exceptionCount; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(exceptionCount), "can't get Exception section's count"_s); |
| WASM_PARSER_FAIL_IF(exceptionCount > maxExceptions, "Export section's count is too big "_s, exceptionCount, " maximum "_s, maxExceptions); |
| RELEASE_ASSERT(!m_info->internalExceptionTypeIndices.capacity()); |
| WASM_ALLOCATOR_FAIL_IF(!m_info->internalExceptionTypeIndices.tryReserveInitialCapacity(exceptionCount), "can't allocate enough memory for "_s, exceptionCount, " exceptions"_s); |
| |
| for (uint32_t exceptionNumber = 0; exceptionNumber < exceptionCount; ++exceptionNumber) { |
| uint8_t tagType; |
| WASM_PARSER_FAIL_IF(!parseUInt8(tagType), "can't get "_s, exceptionNumber, "th Exception tag type"_s); |
| WASM_PARSER_FAIL_IF(tagType, exceptionNumber, "th Exception has tag type "_s, tagType, " but the only supported tag type is 0"_s); |
| |
| uint32_t typeNumber; |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(typeNumber), "can't get "_s, exceptionNumber, "th Exception's type number"_s); |
| WASM_PARSER_FAIL_IF(typeNumber >= m_info->typeCount(), exceptionNumber, "th Exception type number is invalid "_s, typeNumber); |
| TypeIndex typeIndex = TypeInformation::get(m_info->typeSignatures[typeNumber]); |
| auto signature = TypeInformation::tryGetFunctionSignature(typeIndex); |
| WASM_PARSER_FAIL_IF(!signature.has_value(), exceptionNumber, "th Exception type "_s, typeNumber, " doesn't have a function signature"_s); |
| WASM_PARSER_FAIL_IF(!signature.value()->returnsVoid(), exceptionNumber, "th Exception type cannot have a non-void return type "_s, typeNumber); |
| m_info->internalExceptionTypeIndices.append(typeIndex); |
| } |
| |
| return { }; |
| } |
| auto SectionParser::parseCustom() -> PartialResult |
| { |
| CustomSection section; |
| uint32_t customSectionNumber = m_info->customSections.size() + 1; |
| uint32_t nameLen; |
| WASM_ALLOCATOR_FAIL_IF(!m_info->customSections.tryReserveCapacity(customSectionNumber), "can't allocate enough memory for "_s, customSectionNumber, "th custom section"_s); |
| WASM_PARSER_FAIL_IF(!parseVarUInt32(nameLen), "can't get "_s, customSectionNumber, "th custom section's name length"_s); |
| WASM_ALLOCATOR_FAIL_IF(!consumeUTF8String(section.name, nameLen), "nameLen get "_s, customSectionNumber, "th custom section's name of length "_s, nameLen); |
| |
| uint32_t payloadBytes = source().size() - m_offset; |
| WASM_ALLOCATOR_FAIL_IF(!section.payload.tryReserveInitialCapacity(payloadBytes), "can't allocate enough memory for "_s, customSectionNumber, "th custom section's "_s, payloadBytes, " bytes"_s); |
| |
| section.payload.grow(payloadBytes); |
| memcpySpan(section.payload.mutableSpan(), source().subspan(m_offset, payloadBytes)); |
| m_offset += payloadBytes; |
| |
| if (WTF::Unicode::equal("name"_span8, section.name.span())) { |
| NameSectionParser nameSectionParser(section.payload, m_info); |
| auto nameSection = nameSectionParser.parse(); |
| if (nameSection) |
| m_info->nameSection = WTFMove(*nameSection); |
| else |
| dataLogLnIf(Options::dumpWasmWarnings(), "Could not parse name section: ", nameSection.error()); |
| } else if (WTF::Unicode::equal("metadata.code.branch_hint"_span8, section.name.span())) { |
| BranchHintsSectionParser branchHintsSectionParser(section.payload, m_info); |
| std::ignore = branchHintsSectionParser.parse(); |
| } else if (WTF::Unicode::equal("sourceMappingURL"_span8, section.name.span())) { |
| SourceMappingURLSectionParser sourceMappingURLSectionParser(section.payload, m_info); |
| std::ignore = sourceMappingURLSectionParser.parse(); |
| } |
| |
| m_info->customSections.append(WTFMove(section)); |
| |
| return { }; |
| } |
| |
| } } // namespace JSC::Wasm |
| |
| #endif // ENABLE(WEBASSEMBLY) |
