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diff --git a/js/src/wasm/WasmSerialize.cpp b/js/src/wasm/WasmSerialize.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "wasm/WasmSerialize.h"
+
+#include "mozilla/EnumeratedRange.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/Vector.h"
+
+#include <cstdint>
+#include <cstring>
+#include <type_traits>
+#include <utility>
+
+#include "js/StreamConsumer.h"
+#include "wasm/WasmCode.h"
+#include "wasm/WasmCodegenTypes.h"
+#include "wasm/WasmGC.h"
+#include "wasm/WasmInitExpr.h"
+#include "wasm/WasmModule.h"
+#include "wasm/WasmModuleTypes.h"
+#include "wasm/WasmTypeDef.h"
+#include "wasm/WasmValType.h"
+#include "wasm/WasmValue.h"
+
+using namespace js;
+using namespace js::wasm;
+
+using mozilla::Err;
+using mozilla::Ok;
+
+namespace js {
+namespace wasm {
+
+// The following assert is used as a tripwire for for new fields being added to
+// types. If this assertion is broken by your code, verify the serialization
+// code is correct, and then update the assertion.
+//
+// We only check serialized type sizes on one 'golden' platform. The platform
+// is arbitrary, but must remain consistent. The platform should be as specific
+// as possible so these assertions don't erroneously fire. Checkout the
+// definition of ENABLE_WASM_VERIFY_SERIALIZATION_FOR_SIZE in js/moz.configure
+// for the current platform.
+//
+// If this mechanism becomes a hassle, we can investigate other methods of
+// achieving the same goal.
+#if defined(ENABLE_WASM_VERIFY_SERIALIZATION_FOR_SIZE)
+
+template <typename T, size_t Size>
+struct Tripwire {
+ // The following will print a compile error that contains the size of type,
+ // and can be used for updating the assertion to the correct size.
+ static char (*_Error)[sizeof(T)] = 1;
+
+ // We must reference the bad declaration to work around SFINAE.
+ static const bool Value = !_Error;
+};
+
+template <typename T>
+struct Tripwire<T, sizeof(T)> {
+ static const bool Value = true;
+};
+
+# define WASM_VERIFY_SERIALIZATION_FOR_SIZE(Type, Size) \
+ static_assert(Tripwire<Type, Size>::Value);
+
+#else
+# define WASM_VERIFY_SERIALIZATION_FOR_SIZE(Type, Size) static_assert(true);
+#endif
+
+// A pointer is not cacheable POD
+static_assert(!is_cacheable_pod<const uint8_t*>);
+
+// A non-fixed sized array is not cacheable POD
+static_assert(!is_cacheable_pod<uint8_t[]>);
+
+// Cacheable POD is not inherited
+struct TestPodBase {};
+WASM_DECLARE_CACHEABLE_POD(TestPodBase);
+struct InheritTestPodBase : public TestPodBase {};
+static_assert(is_cacheable_pod<TestPodBase> &&
+ !is_cacheable_pod<InheritTestPodBase>);
+
+// Coding functions for containers and smart pointers need to know which code
+// function to apply to the inner value. 'CodeFunc' is the common signature to
+// be used for this.
+template <CoderMode mode, typename T>
+using CodeFunc = CoderResult (*)(Coder<mode>&, CoderArg<mode, T>);
+
+// Some functions are generic for MODE_SIZE and MODE_ENCODE, but not
+// MODE_DECODE. This assert is used to ensure that the right function overload
+// is chosen in these cases.
+#define STATIC_ASSERT_ENCODING_OR_SIZING \
+ static_assert(mode == MODE_ENCODE || mode == MODE_SIZE, "wrong overload");
+
+CoderResult Coder<MODE_SIZE>::writeBytes(const void* unusedSrc, size_t length) {
+ size_ += length;
+ if (!size_.isValid()) {
+ return Err(OutOfMemory());
+ }
+ return Ok();
+}
+
+CoderResult Coder<MODE_ENCODE>::writeBytes(const void* src, size_t length) {
+ MOZ_RELEASE_ASSERT(buffer_ + length <= end_);
+ memcpy(buffer_, src, length);
+ buffer_ += length;
+ return Ok();
+}
+
+CoderResult Coder<MODE_DECODE>::readBytes(void* dest, size_t length) {
+ MOZ_RELEASE_ASSERT(buffer_ + length <= end_);
+ memcpy(dest, buffer_, length);
+ buffer_ += length;
+ return Ok();
+}
+
+// Cacheable POD coding functions
+
+template <typename T,
+ typename std::enable_if_t<is_cacheable_pod<T>, bool> = true>
+CoderResult CodePod(Coder<MODE_DECODE>& coder, T* item) {
+ return coder.readBytes((void*)item, sizeof(T));
+}
+
+template <CoderMode mode, typename T,
+ typename std::enable_if_t<is_cacheable_pod<T>, bool> = true>
+CoderResult CodePod(Coder<mode>& coder, const T* item) {
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+ return coder.writeBytes((const void*)item, sizeof(T));
+}
+
+// "Magic Marker". Use to sanity check the serialization process.
+
+enum class Marker : uint32_t {
+ LinkData = 0x49102278,
+ Imports,
+ Exports,
+ DataSegments,
+ ElemSegments,
+ CustomSections,
+ Code,
+ Metadata,
+ MetadataTier,
+ CodeTier,
+ ModuleSegment,
+};
+
+template <CoderMode mode>
+CoderResult Magic(Coder<mode>& coder, Marker item) {
+ if constexpr (mode == MODE_DECODE) {
+ // Assert the specified marker is in the binary
+ Marker decoded;
+ MOZ_TRY(CodePod(coder, &decoded));
+ MOZ_RELEASE_ASSERT(decoded == item);
+ return Ok();
+ } else {
+ // Encode the specified marker in the binary
+ return CodePod(coder, &item);
+ }
+}
+
+// mozilla::Maybe coding functions
+//
+// These functions will only code the inner value if Maybe.isSome(). The
+// coding function to use for the inner value is specified by a template
+// parameter.
+
+template <CoderMode _, typename T, CodeFunc<MODE_DECODE, T> CodeT>
+CoderResult CodeMaybe(Coder<MODE_DECODE>& coder, Maybe<T>* item) {
+ // Decode 'isSome()'
+ uint8_t isSome;
+ MOZ_TRY(CodePod(coder, &isSome));
+
+ if (isSome == 1) {
+ // Initialize to Some with default constructor
+ item->emplace();
+ // Code the inner type
+ MOZ_TRY(CodeT(coder, item->ptr()));
+ } else {
+ // Initialize to nothing
+ *item = mozilla::Nothing();
+ }
+ return Ok();
+}
+
+template <CoderMode mode, typename T, CodeFunc<mode, T> CodeT>
+CoderResult CodeMaybe(Coder<mode>& coder, const Maybe<T>* item) {
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+
+ // Encode or size 'isSome()'
+ const uint8_t isSome = item->isSome() ? 1 : 0;
+ MOZ_TRY(CodePod(coder, &isSome));
+
+ if (item->isSome()) {
+ // Encode or size the inner value
+ MOZ_TRY(CodeT(coder, item->ptr()));
+ }
+ return Ok();
+}
+
+// Cacheable POD mozilla::Vector coding functions
+//
+// These functions are only available if the element type is cacheable POD. In
+// this case, the whole contents of the vector are copied directly to/from the
+// buffer.
+
+template <typename T, size_t N,
+ typename std::enable_if_t<is_cacheable_pod<T>, bool> = true>
+CoderResult CodePodVector(Coder<MODE_DECODE>& coder,
+ Vector<T, N, SystemAllocPolicy>* item) {
+ // Decode the length
+ size_t length;
+ MOZ_TRY(CodePod(coder, &length));
+
+ // Prepare to copy into the vector
+ if (!item->initLengthUninitialized(length)) {
+ return Err(OutOfMemory());
+ }
+
+ // Copy directly from the buffer to the vector
+ const size_t byteLength = length * sizeof(T);
+ return coder.readBytes((void*)item->begin(), byteLength);
+}
+
+template <CoderMode mode, typename T, size_t N,
+ typename std::enable_if_t<is_cacheable_pod<T>, bool> = true>
+CoderResult CodePodVector(Coder<mode>& coder,
+ const Vector<T, N, SystemAllocPolicy>* item) {
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+
+ // Encode the length
+ const size_t length = item->length();
+ MOZ_TRY(CodePod(coder, &length));
+
+ // Copy directly from the vector to the buffer
+ const size_t byteLength = length * sizeof(T);
+ return coder.writeBytes((const void*)item->begin(), byteLength);
+}
+
+// Non-cacheable-POD mozilla::Vector coding functions
+//
+// These functions implement the general case of coding a vector of some type.
+// The coding function to use on the vector elements is provided through a
+// template parameter.
+
+template <CoderMode _, typename T, CodeFunc<MODE_DECODE, T> CodeT, size_t N,
+ typename std::enable_if_t<!is_cacheable_pod<T>, bool> = true>
+CoderResult CodeVector(Coder<MODE_DECODE>& coder,
+ Vector<T, N, SystemAllocPolicy>* item) {
+ // Decode the length
+ size_t length;
+ MOZ_TRY(CodePod(coder, &length));
+
+ // Attempt to grow the buffer to length, this will default initialize each
+ // element
+ if (!item->resize(length)) {
+ return Err(OutOfMemory());
+ }
+
+ // Decode each child element from the buffer
+ for (auto iter = item->begin(); iter != item->end(); iter++) {
+ MOZ_TRY(CodeT(coder, iter));
+ }
+ return Ok();
+}
+
+template <CoderMode mode, typename T, CodeFunc<mode, T> CodeT, size_t N,
+ typename std::enable_if_t<!is_cacheable_pod<T>, bool> = true>
+CoderResult CodeVector(Coder<mode>& coder,
+ const Vector<T, N, SystemAllocPolicy>* item) {
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+
+ // Encode the length
+ const size_t length = item->length();
+ MOZ_TRY(CodePod(coder, &length));
+
+ // Encode each child element
+ for (auto iter = item->begin(); iter != item->end(); iter++) {
+ MOZ_TRY(CodeT(coder, iter));
+ }
+ return Ok();
+}
+
+// This function implements encoding and decoding of RefPtr<T>. A coding
+// function is provided for the inner value through a template parameter.
+//
+// The special handling of const qualification allows a RefPtr<const T> to be
+// decoded correctly.
+template <CoderMode mode, typename T,
+ CodeFunc<mode, std::remove_const_t<T>> CodeT>
+CoderResult CodeRefPtr(Coder<mode>& coder, CoderArg<mode, RefPtr<T>> item) {
+ if constexpr (mode == MODE_DECODE) {
+ // The RefPtr should not be initialized yet
+ MOZ_ASSERT(!item->get());
+
+ // Allocate and default construct the inner type
+ auto* allocated = js_new<std::remove_const_t<T>>();
+ if (!allocated) {
+ return Err(OutOfMemory());
+ }
+
+ // Initialize the RefPtr
+ *item = allocated;
+
+ // Decode the inner type
+ MOZ_TRY(CodeT(coder, allocated));
+ return Ok();
+ } else {
+ // Encode the inner type
+ return CodeT(coder, item->get());
+ }
+}
+
+// This function implements encoding and decoding of UniquePtr<T>.
+// A coding function is provided for the inner value as a function parameter.
+// The coding function may accept additional parameters to forward to the inner
+// coding function.
+//
+// The inner coding function is provided as an argument instead of a template
+// parameter in order to make the variable arguments template parameter
+// simpler.
+template <CoderMode mode, typename T, typename CodeTFunctor, typename... Args>
+CoderResult CodeUniquePtr(Coder<mode>& coder, CoderArg<mode, UniquePtr<T>> item,
+ CodeTFunctor innerCode, Args&&... args) {
+ if constexpr (mode == MODE_DECODE) {
+ // The UniquePtr should not be initialized yet
+ MOZ_ASSERT(!item->get());
+
+ // Allocate and default construct the inner type
+ auto allocated = js::MakeUnique<std::remove_const_t<T>>();
+ if (!allocated.get()) {
+ return Err(OutOfMemory());
+ }
+
+ // Decode the inner type
+ MOZ_TRY(innerCode(coder, allocated.get(), std::forward<Args>(args)...));
+
+ // Initialize the UniquePtr
+ *item = std::move(allocated);
+ return Ok();
+ } else {
+ // Encode the inner type
+ return innerCode(coder, item->get(), std::forward<Args>(args)...);
+ }
+}
+
+// CacheableChars coding functions
+
+static size_t StringLengthWithNullChar(const char* chars) {
+ return chars ? strlen(chars) + 1 : 0;
+}
+
+CoderResult CodeCacheableChars(Coder<MODE_DECODE>& coder,
+ CacheableChars* item) {
+ uint32_t lengthWithNullChar;
+ MOZ_TRY(CodePod(coder, &lengthWithNullChar));
+
+ // Decode the bytes, if any
+ if (lengthWithNullChar) {
+ item->reset(js_pod_malloc<char>(lengthWithNullChar));
+ if (!item->get()) {
+ return Err(OutOfMemory());
+ }
+ return coder.readBytes((char*)item->get(), lengthWithNullChar);
+ }
+
+ // If there were no bytes to write, the string should be null
+ MOZ_ASSERT(!item->get());
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeCacheableChars(Coder<mode>& coder, const CacheableChars* item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::CacheableChars, 8);
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+
+ // Encode the length
+ const uint32_t lengthWithNullChar = StringLengthWithNullChar(item->get());
+ MOZ_TRY(CodePod(coder, &lengthWithNullChar));
+
+ // Write the bytes, if any
+ if (lengthWithNullChar) {
+ return coder.writeBytes((const void*)item->get(), lengthWithNullChar);
+ }
+
+ // If there were no bytes to write, the string should be null
+ MOZ_ASSERT(!item->get());
+ return Ok();
+}
+
+// Code a CacheableName
+
+template <CoderMode mode>
+CoderResult CodeCacheableName(Coder<mode>& coder,
+ CoderArg<mode, CacheableName> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::CacheableName, 40);
+ MOZ_TRY(CodePodVector(coder, &item->bytes_));
+ return Ok();
+}
+
+// Code a ShareableBytes. This function only needs to forward to the inner
+// bytes vector.
+template <CoderMode mode>
+CoderResult CodeShareableBytes(Coder<mode>& coder,
+ CoderArg<mode, ShareableBytes> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::ShareableBytes, 48);
+ return CodePodVector(coder, &item->bytes);
+}
+
+// WasmValType.h
+
+/* static */
+SerializableTypeCode SerializableTypeCode::serialize(PackedTypeCode ptc,
+ const TypeContext& types) {
+ SerializableTypeCode stc = {};
+ stc.typeCode = PackedRepr(ptc.typeCode());
+ stc.typeIndex = ptc.typeDef() ? types.indexOf(*ptc.typeDef())
+ : SerializableTypeCode::NoTypeIndex;
+ stc.nullable = ptc.isNullable();
+ return stc;
+}
+
+PackedTypeCode SerializableTypeCode::deserialize(const TypeContext& types) {
+ if (typeIndex == SerializableTypeCode::NoTypeIndex) {
+ return PackedTypeCode::pack(TypeCode(typeCode), nullable);
+ }
+ const TypeDef* typeDef = &types.type(typeIndex);
+ return PackedTypeCode::pack(TypeCode(typeCode), typeDef, nullable);
+}
+
+template <CoderMode mode>
+CoderResult CodePackedTypeCode(Coder<mode>& coder,
+ CoderArg<mode, PackedTypeCode> item) {
+ if constexpr (mode == MODE_DECODE) {
+ SerializableTypeCode stc;
+ MOZ_TRY(CodePod(coder, &stc));
+ *item = stc.deserialize(*coder.types_);
+ return Ok();
+ } else if constexpr (mode == MODE_SIZE) {
+ return coder.writeBytes(nullptr, sizeof(SerializableTypeCode));
+ } else {
+ SerializableTypeCode stc =
+ SerializableTypeCode::serialize(*item, *coder.types_);
+ return CodePod(coder, &stc);
+ }
+}
+
+template <CoderMode mode>
+CoderResult CodeValType(Coder<mode>& coder, CoderArg<mode, ValType> item) {
+ return CodePackedTypeCode(coder, item->addressOfPacked());
+}
+
+template <CoderMode mode>
+CoderResult CodeFieldType(Coder<mode>& coder, CoderArg<mode, FieldType> item) {
+ return CodePackedTypeCode(coder, item->addressOfPacked());
+}
+
+template <CoderMode mode>
+CoderResult CodeRefType(Coder<mode>& coder, CoderArg<mode, RefType> item) {
+ return CodePackedTypeCode(coder, item->addressOfPacked());
+}
+
+// WasmValue.h
+
+template <CoderMode mode>
+CoderResult CodeLitVal(Coder<mode>& coder, CoderArg<mode, LitVal> item) {
+ MOZ_TRY(CodeValType(coder, &item->type_));
+ MOZ_TRY(CodePod(coder, &item->cell_));
+ return Ok();
+}
+
+// WasmInitExpr.h
+
+template <CoderMode mode>
+CoderResult CodeInitExpr(Coder<mode>& coder, CoderArg<mode, InitExpr> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::InitExpr, 80);
+ MOZ_TRY(CodePod(coder, &item->kind_));
+ MOZ_TRY(CodeValType(coder, &item->type_));
+ switch (item->kind_) {
+ case InitExprKind::Literal:
+ MOZ_TRY(CodeLitVal(coder, &item->literal_));
+ break;
+ case InitExprKind::Variable:
+ MOZ_TRY(CodePodVector(coder, &item->bytecode_));
+ break;
+ default:
+ MOZ_CRASH();
+ }
+ return Ok();
+}
+
+// WasmTypeDef.h
+
+template <CoderMode mode>
+CoderResult CodeFuncType(Coder<mode>& coder, CoderArg<mode, FuncType> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::FuncType, 344);
+ MOZ_TRY((CodeVector<mode, ValType, &CodeValType<mode>>(coder, &item->args_)));
+ MOZ_TRY(
+ (CodeVector<mode, ValType, &CodeValType<mode>>(coder, &item->results_)));
+ MOZ_TRY(CodePod(coder, &item->immediateTypeId_));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeStructField(Coder<mode>& coder,
+ CoderArg<mode, StructField> item) {
+ MOZ_TRY(CodeFieldType(coder, &item->type));
+ MOZ_TRY(CodePod(coder, &item->offset));
+ MOZ_TRY(CodePod(coder, &item->isMutable));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeStructType(Coder<mode>& coder,
+ CoderArg<mode, StructType> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::StructType, 136);
+ MOZ_TRY((CodeVector<mode, StructField, &CodeStructField<mode>>(
+ coder, &item->fields_)));
+ MOZ_TRY(CodePod(coder, &item->size_));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeArrayType(Coder<mode>& coder, CoderArg<mode, ArrayType> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::ArrayType, 16);
+ MOZ_TRY(CodeFieldType(coder, &item->elementType_));
+ MOZ_TRY(CodePod(coder, &item->isMutable_));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeTypeDef(Coder<mode>& coder, CoderArg<mode, TypeDef> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::TypeDef, 376);
+ // TypeDef is a tagged union that begins with kind = None. This implies that
+ // we must manually initialize the variant that we decode.
+ if constexpr (mode == MODE_DECODE) {
+ MOZ_RELEASE_ASSERT(item->kind_ == TypeDefKind::None);
+ }
+ MOZ_TRY(CodePod(coder, &item->kind_));
+ switch (item->kind_) {
+ case TypeDefKind::Struct: {
+ if constexpr (mode == MODE_DECODE) {
+ new (&item->structType_) StructType();
+ }
+ MOZ_TRY(CodeStructType(coder, &item->structType_));
+ break;
+ }
+ case TypeDefKind::Func: {
+ if constexpr (mode == MODE_DECODE) {
+ new (&item->funcType_) FuncType();
+ }
+ MOZ_TRY(CodeFuncType(coder, &item->funcType_));
+ break;
+ }
+ case TypeDefKind::Array: {
+ if constexpr (mode == MODE_DECODE) {
+ new (&item->arrayType_) ArrayType();
+ }
+ MOZ_TRY(CodeArrayType(coder, &item->arrayType_));
+ break;
+ }
+ case TypeDefKind::None: {
+ break;
+ }
+ default:
+ MOZ_ASSERT_UNREACHABLE();
+ }
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeTypeContext(Coder<mode>& coder,
+ CoderArg<mode, TypeContext> item) {
+ if constexpr (mode == MODE_DECODE) {
+ // Decoding type definitions needs to reference the type context of the
+ // module
+ MOZ_ASSERT(!coder.types_);
+ coder.types_ = item;
+
+ // Decode the number of recursion groups in the module
+ uint32_t numRecGroups;
+ MOZ_TRY(CodePod(coder, &numRecGroups));
+
+ // Decode each recursion group
+ for (uint32_t recGroupIndex = 0; recGroupIndex < numRecGroups;
+ recGroupIndex++) {
+ // Decode the number of types in the recursion group
+ uint32_t numTypes;
+ MOZ_TRY(CodePod(coder, &numTypes));
+
+ MutableRecGroup recGroup = item->startRecGroup(numTypes);
+ if (!recGroup) {
+ return Err(OutOfMemory());
+ }
+
+ // Decode the type definitions
+ for (uint32_t groupTypeIndex = 0; groupTypeIndex < numTypes;
+ groupTypeIndex++) {
+ MOZ_TRY(CodeTypeDef(coder, &recGroup->type(groupTypeIndex)));
+ }
+
+ // Finish the recursion group
+ if (!item->endRecGroup()) {
+ return Err(OutOfMemory());
+ }
+ }
+ } else {
+ // Encode the number of recursion groups in the module
+ uint32_t numRecGroups = item->groups().length();
+ MOZ_TRY(CodePod(coder, &numRecGroups));
+
+ // Encode each recursion group
+ for (uint32_t groupIndex = 0; groupIndex < numRecGroups; groupIndex++) {
+ SharedRecGroup group = item->groups()[groupIndex];
+
+ // Encode the number of types in the recursion group
+ uint32_t numTypes = group->numTypes();
+ MOZ_TRY(CodePod(coder, &numTypes));
+
+ // Encode the type definitions
+ for (uint32_t i = 0; i < numTypes; i++) {
+ MOZ_TRY(CodeTypeDef(coder, &group->type(i)));
+ }
+ }
+ }
+ return Ok();
+}
+
+// WasmModuleTypes.h
+
+template <CoderMode mode>
+CoderResult CodeImport(Coder<mode>& coder, CoderArg<mode, Import> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::Import, 88);
+ MOZ_TRY(CodeCacheableName(coder, &item->module));
+ MOZ_TRY(CodeCacheableName(coder, &item->field));
+ MOZ_TRY(CodePod(coder, &item->kind));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeExport(Coder<mode>& coder, CoderArg<mode, Export> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::Export, 48);
+ MOZ_TRY(CodeCacheableName(coder, &item->fieldName_));
+ MOZ_TRY(CodePod(coder, &item->pod));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeGlobalDesc(Coder<mode>& coder,
+ CoderArg<mode, GlobalDesc> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::GlobalDesc, 104);
+ MOZ_TRY(CodePod(coder, &item->kind_));
+ MOZ_TRY(CodeInitExpr(coder, &item->initial_));
+ MOZ_TRY(CodePod(coder, &item->offset_));
+ MOZ_TRY(CodePod(coder, &item->isMutable_));
+ MOZ_TRY(CodePod(coder, &item->isWasm_));
+ MOZ_TRY(CodePod(coder, &item->isExport_));
+ MOZ_TRY(CodePod(coder, &item->importIndex_));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeTagType(Coder<mode>& coder, CoderArg<mode, TagType> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::TagType, 232);
+ MOZ_TRY(
+ (CodeVector<mode, ValType, &CodeValType<mode>>(coder, &item->argTypes_)));
+ MOZ_TRY(CodePodVector(coder, &item->argOffsets_));
+ MOZ_TRY(CodePod(coder, &item->size_));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeTagDesc(Coder<mode>& coder, CoderArg<mode, TagDesc> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::TagDesc, 24);
+ MOZ_TRY(CodePod(coder, &item->kind));
+ MOZ_TRY((
+ CodeRefPtr<mode, const TagType, &CodeTagType<mode>>(coder, &item->type)));
+ MOZ_TRY(CodePod(coder, &item->isExport));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeElemSegment(Coder<mode>& coder,
+ CoderArg<mode, ElemSegment> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::ElemSegment, 184);
+ MOZ_TRY(CodePod(coder, &item->kind));
+ MOZ_TRY(CodePod(coder, &item->tableIndex));
+ MOZ_TRY(CodeRefType(coder, &item->elemType));
+ MOZ_TRY((CodeMaybe<mode, InitExpr, &CodeInitExpr<mode>>(
+ coder, &item->offsetIfActive)));
+ MOZ_TRY(CodePodVector(coder, &item->elemFuncIndices));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeDataSegment(Coder<mode>& coder,
+ CoderArg<mode, DataSegment> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::DataSegment, 136);
+ MOZ_TRY((CodeMaybe<mode, InitExpr, &CodeInitExpr<mode>>(
+ coder, &item->offsetIfActive)));
+ MOZ_TRY(CodePodVector(coder, &item->bytes));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeCustomSection(Coder<mode>& coder,
+ CoderArg<mode, CustomSection> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::CustomSection, 48);
+ MOZ_TRY(CodePodVector(coder, &item->name));
+ MOZ_TRY((CodeRefPtr<mode, const ShareableBytes, &CodeShareableBytes<mode>>(
+ coder, &item->payload)));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeTableDesc(Coder<mode>& coder, CoderArg<mode, TableDesc> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::TableDesc, 112);
+ MOZ_TRY(CodeRefType(coder, &item->elemType));
+ MOZ_TRY(CodePod(coder, &item->isImported));
+ MOZ_TRY(CodePod(coder, &item->isExported));
+ MOZ_TRY(CodePod(coder, &item->isAsmJS));
+ MOZ_TRY(CodePod(coder, &item->initialLength));
+ MOZ_TRY(CodePod(coder, &item->maximumLength));
+ MOZ_TRY(
+ (CodeMaybe<mode, InitExpr, &CodeInitExpr<mode>>(coder, &item->initExpr)));
+ return Ok();
+}
+
+// WasmCodegenTypes.h
+
+template <CoderMode mode>
+CoderResult CodeTrapSiteVectorArray(Coder<mode>& coder,
+ CoderArg<mode, TrapSiteVectorArray> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::TrapSiteVectorArray, 520);
+ for (Trap trap : mozilla::MakeEnumeratedRange(Trap::Limit)) {
+ MOZ_TRY(CodePodVector(coder, &(*item)[trap]));
+ }
+ return Ok();
+}
+
+// WasmGC.h
+
+CoderResult CodeStackMap(Coder<MODE_DECODE>& coder,
+ CoderArg<MODE_DECODE, wasm::StackMap*> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::StackMap, 12);
+ // Decode the stack map header
+ StackMapHeader header;
+ MOZ_TRY(CodePod(coder, &header));
+
+ // Allocate a stack map for the header
+ StackMap* map = StackMap::create(header);
+ if (!map) {
+ return Err(OutOfMemory());
+ }
+
+ // Decode the bitmap into the stackmap
+ MOZ_TRY(coder.readBytes(map->rawBitmap(), map->rawBitmapLengthInBytes()));
+
+ *item = map;
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeStackMap(Coder<mode>& coder,
+ CoderArg<mode, wasm::StackMap> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::StackMap, 12);
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+
+ // Encode the stackmap header
+ MOZ_TRY(CodePod(coder, &item->header));
+
+ // Encode the stackmap bitmap
+ MOZ_TRY(coder.writeBytes(item->rawBitmap(), item->rawBitmapLengthInBytes()));
+
+ return Ok();
+}
+
+static uint32_t ComputeCodeOffset(const uint8_t* codeStart,
+ const uint8_t* codePtr) {
+ MOZ_RELEASE_ASSERT(codePtr >= codeStart);
+#ifdef JS_64BIT
+ MOZ_RELEASE_ASSERT(codePtr < codeStart + UINT32_MAX);
+#endif
+ return (uint32_t)(codePtr - codeStart);
+}
+
+CoderResult CodeStackMaps(Coder<MODE_DECODE>& coder,
+ CoderArg<MODE_DECODE, wasm::StackMaps> item,
+ const uint8_t* codeStart) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::StackMaps, 48);
+ // Decode the amount of stack maps
+ size_t length;
+ MOZ_TRY(CodePod(coder, &length));
+
+ for (size_t i = 0; i < length; i++) {
+ // Decode the offset relative to codeStart
+ uint32_t codeOffset;
+ MOZ_TRY(CodePod(coder, &codeOffset));
+
+ // Decode the stack map
+ StackMap* map;
+ MOZ_TRY(CodeStackMap(coder, &map));
+
+ // Add it to the map
+ const uint8_t* nextInsnAddr = codeStart + codeOffset;
+ if (!item->add(nextInsnAddr, map)) {
+ return Err(OutOfMemory());
+ }
+ }
+
+ // Finish the maps, asserting they are sorted
+ item->finishAlreadySorted();
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeStackMaps(Coder<mode>& coder,
+ CoderArg<mode, wasm::StackMaps> item,
+ const uint8_t* codeStart) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::StackMaps, 48);
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+
+ // Encode the amount of stack maps
+ size_t length = item->length();
+ MOZ_TRY(CodePod(coder, &length));
+
+ for (size_t i = 0; i < length; i++) {
+ StackMaps::Maplet maplet = item->get(i);
+ uint32_t codeOffset = ComputeCodeOffset(codeStart, maplet.nextInsnAddr);
+
+ // Encode the offset relative to codeStart
+ MOZ_TRY(CodePod(coder, &codeOffset));
+
+ // Encode the stack map
+ MOZ_TRY(CodeStackMap(coder, maplet.map));
+ }
+ return Ok();
+}
+
+// WasmCode.h
+
+template <CoderMode mode>
+CoderResult CodeSymbolicLinkArray(
+ Coder<mode>& coder,
+ CoderArg<mode, wasm::LinkData::SymbolicLinkArray> item) {
+ for (SymbolicAddress address :
+ mozilla::MakeEnumeratedRange(SymbolicAddress::Limit)) {
+ MOZ_TRY(CodePodVector(coder, &(*item)[address]));
+ }
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeLinkData(Coder<mode>& coder,
+ CoderArg<mode, wasm::LinkData> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::LinkData, 7608);
+ if constexpr (mode == MODE_ENCODE) {
+ MOZ_ASSERT(item->tier == Tier::Serialized);
+ }
+ MOZ_TRY(CodePod(coder, &item->pod()));
+ MOZ_TRY(CodePodVector(coder, &item->internalLinks));
+ MOZ_TRY(CodeSymbolicLinkArray(coder, &item->symbolicLinks));
+ return Ok();
+}
+
+CoderResult CodeModuleSegment(Coder<MODE_DECODE>& coder,
+ wasm::UniqueModuleSegment* item,
+ const wasm::LinkData& linkData) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::ModuleSegment, 48);
+ // Assert we're decoding a ModuleSegment
+ MOZ_TRY(Magic(coder, Marker::ModuleSegment));
+
+ // Decode the code bytes length
+ size_t length;
+ MOZ_TRY(CodePod(coder, &length));
+
+ // Allocate the code bytes
+ UniqueCodeBytes bytes = AllocateCodeBytes(length);
+ if (!bytes) {
+ return Err(OutOfMemory());
+ }
+
+ // Decode the code bytes
+ MOZ_TRY(coder.readBytes(bytes.get(), length));
+
+ // Initialize the ModuleSegment
+ *item = js::MakeUnique<ModuleSegment>(Tier::Serialized, std::move(bytes),
+ length, linkData);
+ if (!*item) {
+ return Err(OutOfMemory());
+ }
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeModuleSegment(Coder<mode>& coder,
+ CoderArg<mode, wasm::UniqueModuleSegment> item,
+ const wasm::LinkData& linkData) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::ModuleSegment, 48);
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+ MOZ_ASSERT((*item)->tier() == Tier::Serialized);
+
+ // Mark that we're encoding a ModuleSegment
+ MOZ_TRY(Magic(coder, Marker::ModuleSegment));
+
+ // Encode the length
+ size_t length = (*item)->length();
+ MOZ_TRY(CodePod(coder, &length));
+
+ if constexpr (mode == MODE_SIZE) {
+ // Just calculate the length of bytes written
+ MOZ_TRY(coder.writeBytes((*item)->base(), length));
+ } else {
+ // Get the start of where the code bytes will be written
+ uint8_t* serializedBase = coder.buffer_;
+
+ // Write the code bytes
+ MOZ_TRY(coder.writeBytes((*item)->base(), length));
+
+ // Unlink the code bytes written to the buffer
+ StaticallyUnlink(serializedBase, linkData);
+ }
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeMetadataTier(Coder<mode>& coder,
+ CoderArg<mode, wasm::MetadataTier> item,
+ const uint8_t* codeStart) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::MetadataTier, 856);
+ MOZ_TRY(Magic(coder, Marker::MetadataTier));
+ MOZ_TRY(CodePodVector(coder, &item->funcToCodeRange));
+ MOZ_TRY(CodePodVector(coder, &item->codeRanges));
+ MOZ_TRY(CodePodVector(coder, &item->callSites));
+ MOZ_TRY(CodeTrapSiteVectorArray(coder, &item->trapSites));
+ MOZ_TRY(CodePodVector(coder, &item->funcImports));
+ MOZ_TRY(CodePodVector(coder, &item->funcExports));
+ MOZ_TRY(CodeStackMaps(coder, &item->stackMaps, codeStart));
+ MOZ_TRY(CodePodVector(coder, &item->tryNotes));
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeMetadata(Coder<mode>& coder,
+ CoderArg<mode, wasm::Metadata> item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::Metadata, 408);
+ if constexpr (mode == MODE_ENCODE) {
+ // Serialization doesn't handle asm.js or debug enabled modules
+ MOZ_ASSERT(!item->debugEnabled && item->debugFuncTypeIndices.empty());
+ MOZ_ASSERT(!item->isAsmJS());
+ }
+
+ MOZ_TRY(Magic(coder, Marker::Metadata));
+ MOZ_TRY(CodePod(coder, &item->pod()));
+ MOZ_TRY((CodeRefPtr<mode, const TypeContext, &CodeTypeContext>(
+ coder, &item->types)));
+ MOZ_TRY((CodeVector<mode, GlobalDesc, &CodeGlobalDesc<mode>>(
+ coder, &item->globals)));
+ MOZ_TRY((
+ CodeVector<mode, TableDesc, &CodeTableDesc<mode>>(coder, &item->tables)));
+ MOZ_TRY((CodeVector<mode, TagDesc, &CodeTagDesc<mode>>(coder, &item->tags)));
+ MOZ_TRY(CodePod(coder, &item->moduleName));
+ MOZ_TRY(CodePodVector(coder, &item->funcNames));
+ MOZ_TRY(CodeCacheableChars(coder, &item->filename));
+ MOZ_TRY(CodeCacheableChars(coder, &item->sourceMapURL));
+
+ if constexpr (mode == MODE_DECODE) {
+ // Initialize debugging state to disabled
+ item->debugEnabled = false;
+ item->debugFuncTypeIndices.clear();
+ }
+
+ return Ok();
+}
+
+CoderResult CodeCodeTier(Coder<MODE_DECODE>& coder, wasm::UniqueCodeTier* item,
+ const wasm::LinkData& linkData) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::CodeTier, 248);
+ UniqueMetadataTier metadata;
+ UniqueModuleSegment segment;
+ MOZ_TRY(Magic(coder, Marker::CodeTier));
+ MOZ_TRY(CodeModuleSegment(coder, &segment, linkData));
+ MOZ_TRY((CodeUniquePtr<MODE_DECODE, MetadataTier>(
+ coder, &metadata, &CodeMetadataTier<MODE_DECODE>, segment->base())));
+ *item = js::MakeUnique<CodeTier>(std::move(metadata), std::move(segment));
+ if (!*item) {
+ return Err(OutOfMemory());
+ }
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeCodeTier(Coder<mode>& coder,
+ CoderArg<mode, wasm::CodeTier> item,
+ const wasm::LinkData& linkData) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::CodeTier, 248);
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+ MOZ_TRY(Magic(coder, Marker::CodeTier));
+ MOZ_TRY(CodeModuleSegment(coder, &item->segment_, linkData));
+ MOZ_TRY((CodeUniquePtr<mode, MetadataTier>(coder, &item->metadata_,
+ &CodeMetadataTier<mode>,
+ item->segment_->base())));
+ return Ok();
+}
+
+CoderResult CodeSharedCode(Coder<MODE_DECODE>& coder, wasm::SharedCode* item,
+ const wasm::LinkData& linkData,
+ const wasm::CustomSectionVector& customSections) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::Code, 192);
+ MutableMetadata metadata;
+ UniqueCodeTier codeTier;
+ MOZ_TRY((CodeRefPtr<MODE_DECODE, Metadata, &CodeMetadata>(coder, &metadata)));
+ MOZ_TRY(CodeCodeTier(coder, &codeTier, linkData));
+
+ // Initialize metadata's name payload from the custom section
+ if (metadata->nameCustomSectionIndex) {
+ metadata->namePayload =
+ customSections[*metadata->nameCustomSectionIndex].payload;
+ } else {
+ MOZ_RELEASE_ASSERT(!metadata->moduleName);
+ MOZ_RELEASE_ASSERT(metadata->funcNames.empty());
+ }
+
+ // Initialize the jump tables
+ JumpTables jumpTables;
+ if (!jumpTables.init(CompileMode::Once, codeTier->segment(),
+ codeTier->metadata().codeRanges)) {
+ return Err(OutOfMemory());
+ }
+
+ // Create and initialize the code
+ MutableCode code =
+ js_new<Code>(std::move(codeTier), *metadata, std::move(jumpTables));
+ if (!code || !code->initialize(linkData)) {
+ return Err(OutOfMemory());
+ }
+ *item = code;
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeSharedCode(Coder<mode>& coder,
+ CoderArg<mode, wasm::SharedCode> item,
+ const wasm::LinkData& linkData) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::Code, 192);
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+ MOZ_TRY((CodeRefPtr<mode, const Metadata, &CodeMetadata>(
+ coder, &(*item)->metadata_)));
+ MOZ_TRY(CodeCodeTier(coder, &(*item)->codeTier(Tier::Serialized), linkData));
+ return Ok();
+}
+
+// WasmModule.h
+
+CoderResult CodeModule(Coder<MODE_DECODE>& coder, MutableModule* item) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::Module, 256);
+ JS::BuildIdCharVector currentBuildId;
+ if (!GetOptimizedEncodingBuildId(&currentBuildId)) {
+ return Err(OutOfMemory());
+ }
+ JS::BuildIdCharVector deserializedBuildId;
+ MOZ_TRY(CodePodVector(coder, &deserializedBuildId));
+
+ MOZ_RELEASE_ASSERT(EqualContainers(currentBuildId, deserializedBuildId));
+
+ LinkData linkData(Tier::Serialized);
+ MOZ_TRY(Magic(coder, Marker::LinkData));
+ MOZ_TRY(CodeLinkData(coder, &linkData));
+
+ ImportVector imports;
+ MOZ_TRY(Magic(coder, Marker::Imports));
+ MOZ_TRY((CodeVector<MODE_DECODE, Import, &CodeImport<MODE_DECODE>>(
+ coder, &imports)));
+
+ ExportVector exports;
+ MOZ_TRY(Magic(coder, Marker::Exports));
+ MOZ_TRY((CodeVector<MODE_DECODE, Export, &CodeExport<MODE_DECODE>>(
+ coder, &exports)));
+
+ DataSegmentVector dataSegments;
+ MOZ_TRY(Magic(coder, Marker::DataSegments));
+ MOZ_TRY((CodeVector<MODE_DECODE, SharedDataSegment,
+ &CodeRefPtr<MODE_DECODE, const DataSegment,
+ &CodeDataSegment<MODE_DECODE>>>(
+ coder, &dataSegments)));
+
+ ElemSegmentVector elemSegments;
+ MOZ_TRY(Magic(coder, Marker::ElemSegments));
+ MOZ_TRY((CodeVector<MODE_DECODE, SharedElemSegment,
+ &CodeRefPtr<MODE_DECODE, const ElemSegment,
+ &CodeElemSegment<MODE_DECODE>>>(
+ coder, &elemSegments)));
+
+ CustomSectionVector customSections;
+ MOZ_TRY(Magic(coder, Marker::CustomSections));
+ MOZ_TRY(
+ (CodeVector<MODE_DECODE, CustomSection, &CodeCustomSection<MODE_DECODE>>(
+ coder, &customSections)));
+
+ SharedCode code;
+ MOZ_TRY(Magic(coder, Marker::Code));
+ MOZ_TRY(CodeSharedCode(coder, &code, linkData, customSections));
+
+ *item = js_new<Module>(*code, std::move(imports), std::move(exports),
+ std::move(dataSegments), std::move(elemSegments),
+ std::move(customSections), nullptr,
+ /* loggingDeserialized = */ true);
+ return Ok();
+}
+
+template <CoderMode mode>
+CoderResult CodeModule(Coder<mode>& coder, CoderArg<mode, Module> item,
+ const wasm::LinkData& linkData) {
+ WASM_VERIFY_SERIALIZATION_FOR_SIZE(wasm::Module, 256);
+ STATIC_ASSERT_ENCODING_OR_SIZING;
+ MOZ_RELEASE_ASSERT(!item->metadata().debugEnabled);
+ MOZ_RELEASE_ASSERT(item->code_->hasTier(Tier::Serialized));
+
+ JS::BuildIdCharVector currentBuildId;
+ if (!GetOptimizedEncodingBuildId(&currentBuildId)) {
+ return Err(OutOfMemory());
+ }
+ MOZ_TRY(CodePodVector(coder, &currentBuildId));
+ MOZ_TRY(Magic(coder, Marker::LinkData));
+ MOZ_TRY(CodeLinkData(coder, &linkData));
+ MOZ_TRY(Magic(coder, Marker::Imports));
+ MOZ_TRY(
+ (CodeVector<mode, Import, &CodeImport<mode>>(coder, &item->imports_)));
+ MOZ_TRY(Magic(coder, Marker::Exports));
+ MOZ_TRY(
+ (CodeVector<mode, Export, &CodeExport<mode>>(coder, &item->exports_)));
+ MOZ_TRY(Magic(coder, Marker::DataSegments));
+ MOZ_TRY(
+ (CodeVector<mode, SharedDataSegment,
+ &CodeRefPtr<mode, const DataSegment, CodeDataSegment<mode>>>(
+ coder, &item->dataSegments_)));
+ MOZ_TRY(Magic(coder, Marker::ElemSegments));
+ MOZ_TRY(
+ (CodeVector<mode, SharedElemSegment,
+ &CodeRefPtr<mode, const ElemSegment, CodeElemSegment<mode>>>(
+ coder, &item->elemSegments_)));
+ MOZ_TRY(Magic(coder, Marker::CustomSections));
+ MOZ_TRY((CodeVector<mode, CustomSection, &CodeCustomSection<mode>>(
+ coder, &item->customSections_)));
+ MOZ_TRY(Magic(coder, Marker::Code));
+ MOZ_TRY(CodeSharedCode(coder, &item->code_, linkData));
+ return Ok();
+}
+
+} // namespace wasm
+} // namespace js
+
+static bool GetSerializedSize(const Module& module, const LinkData& linkData,
+ size_t* size) {
+ Coder<MODE_SIZE> coder(module.metadata().types.get());
+ auto result = CodeModule(coder, &module, linkData);
+ if (result.isErr()) {
+ return false;
+ }
+ *size = coder.size_.value();
+ return true;
+}
+
+bool Module::serialize(const LinkData& linkData, Bytes* bytes) const {
+ MOZ_RELEASE_ASSERT(!metadata().debugEnabled);
+ MOZ_RELEASE_ASSERT(code_->hasTier(Tier::Serialized));
+
+ size_t serializedSize;
+ if (!GetSerializedSize(*this, linkData, &serializedSize)) {
+ // An error is an overflow, return false
+ return false;
+ }
+
+ // Try to allocate the destination buffer
+ if (!bytes->resizeUninitialized(serializedSize)) {
+ return false;
+ }
+
+ Coder<MODE_ENCODE> coder(metadata().types.get(), bytes->begin(),
+ serializedSize);
+ CoderResult result = CodeModule(coder, this, linkData);
+ if (result.isErr()) {
+ // An error is an OOM, return false
+ return false;
+ }
+ // Every byte is accounted for
+ MOZ_RELEASE_ASSERT(coder.buffer_ == coder.end_);
+ return true;
+}
+
+/* static */
+MutableModule Module::deserialize(const uint8_t* begin, size_t size) {
+ Coder<MODE_DECODE> coder(begin, size);
+ MutableModule module;
+ CoderResult result = CodeModule(coder, &module);
+ if (result.isErr()) {
+ // An error is an OOM, return nullptr
+ return nullptr;
+ }
+ // Every byte is accounted for
+ MOZ_RELEASE_ASSERT(coder.buffer_ == coder.end_);
+ return module;
+}
+
+void Module::initGCMallocBytesExcludingCode() {
+ // The size doesn't have to be exact so use the serialization framework to
+ // calculate a value. We consume all errors, as they can only be overflow and
+ // can be ignored until the end.
+ constexpr CoderMode MODE = MODE_SIZE;
+ Coder<MODE> coder(metadata().types.get());
+ (void)CodeVector<MODE, Import, &CodeImport<MODE>>(coder, &imports_);
+ (void)CodeVector<MODE, Export, &CodeExport<MODE>>(coder, &exports_);
+ (void)CodeVector<MODE, SharedDataSegment,
+ &CodeRefPtr<MODE, const DataSegment, CodeDataSegment<MODE>>>(
+ coder, &dataSegments_);
+ (void)CodeVector<MODE, SharedElemSegment,
+ &CodeRefPtr<MODE, const ElemSegment, CodeElemSegment<MODE>>>(
+ coder, &elemSegments_);
+ (void)CodeVector<MODE, CustomSection, &CodeCustomSection<MODE>>(
+ coder, &customSections_);
+
+ // Overflow really shouldn't be possible here, but handle it anyways.
+ size_t serializedSize = coder.size_.isValid() ? coder.size_.value() : 0;
+ gcMallocBytesExcludingCode_ = sizeof(*this) + serializedSize;
+}