/* This Source Code Form is subject to the terms of the Mozilla Public *License,v.2.0.IfacopyoftheMPLwasnotdistributedwiththis
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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using BuiltinModuleFuncIdVector =
Vector<BuiltinModuleFuncId, 0, SystemAllocPolicy>;
// ==== Printing of names // // The Developer-Facing Display Conventions section of the WebAssembly Web // API spec defines two cases for displaying a wasm function name: // 1. the function name stands alone // 2. the function name precedes the location
// wasm::CodeMetadata contains metadata whose lifetime ends at the same time // that the lifetime of wasm::Code ends. This encompasses a wide variety of // uses. In practice that means metadata needed for any and all aspects of // compilation or execution of wasm code. Hence this metadata conceptually // belongs to, and is kept alive by, wasm::Code. Note also that wasm::Code is // in turn kept alive by wasm::Instance(s), hence this metadata will be kept // alive as long as any instance for it exists.
struct CodeMetadata : public ShareableBaseusing SharedModuleMetadata<const ModuleMetadata>;
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// Constant parameters for the entire compilation. These are not marked // `const` only because it breaks constructor delegation in // CodeMetadata::CodeMetadata, which is a shame.
ModuleKind kind;
// The compile arguments that were used for this module.
SharedCompileArgs compileArgs;
// The number of imported functions in the module.
uint32_t numFuncImports; // A vector of the builtin func id (or 'none') for all imported functions. // This may be empty for internally constructed modules which don't care // about this information.
BuiltinModuleFuncIdVector knownFuncImports; // Treat imported wasm functions as if they were JS functions. This is used // when compiling the module for new WebAssembly.Function. bool funcImportsAreJS; // The number of imported globals in the module.
uint32_t numGlobalImports;
// Info about all types in the module.
MutableTypeContext types; // Info about all functions in the module.
FuncDescVector funcs; // Info about all tables in the module.
TableDescVector tables; // Info about all memories in the module.
MemoryDescVector memories; // Info about all tags in the module.
TagDescVector tags; // Info about all globals in the module.
GlobalDescVector globals;
// The start function for the module, if any
mozilla::Maybe<uint32_t> startFuncIndex;
// Info about elem segments needed only for validation and compilation. // Should have the same length as ModuleMetadata::elemSegments, and each // entry here should be identical the corresponding .elemType field in // ModuleMetadata::elemSegments.
RefTypeVector elemSegmentTypes;
// The number of data segments this module will have. Pre-declared before the // code section so that we can validate instructions that reference data // segments.
mozilla::Maybe<uint32_t> dataCount;
// A sorted vector of the index of every function that is exported from this // module. An index into this vector is a 'exported function index' and can // be used to lookup exported functions on an instance.
Uint32Vector exportedFuncIndices;
// asm.js tables are homogenous and only store functions of the same type. // This maps from a function type to the table index to use for an indirect // call.
Uint32Vector asmJSSigToTableIndex;
// Branch hints to apply to functions
BranchHintCollection branchHints;
// Name section information
mozilla::Maybe<NameSection> nameSection;
// Bytecode ranges for custom sections.
CustomSectionRangeVector customSectionRanges;
// Bytecode range for the code section.
MaybeBytecodeRange codeSectionRange;
// ==== Instance layout fields // // The start offset of the FuncDefInstanceData[] section of the instance // data. There is one entry for every function definition.
uint32_t funcDefsOffsetStart; // The start offset of the FuncImportInstanceData[] section of the instance // data. There is one entry for every imported function.
uint32_t funcImportsOffsetStart; // The start offset of the FuncExportInstanceData[] section of the instance // data. There is one entry for every exported function.
uint32_t funcExportsOffsetStart; // The start offset of the TypeDefInstanceData[] section of the instance // data. There is one entry for every type.
uint32_t typeDefsOffsetStart; // The start offset of the MemoryInstanceData[] section of the instance data. // There is one entry for every memory.
uint32_t memoriesOffsetStart; // The start offset of the TableInstanceData[] section of the instance data. // There is one entry for every table.
uint32_t tablesOffsetStart; // The start offset of the tag section of the instance data. There is one // entry for every tag.
uint32_t tagsOffsetStart; // The total size of the instance data.
uint32_t instanceDataLength;
// Generates any new metadata necessary to compile this module. This must be // called after the 'module environment' (everything before the code section) // has been decoded.
[[nodiscard]] bool prepareForCompile(CompileMode mode); bool isPreparedForCompile() const { return instanceDataLength != UINT32_MAX; }
bool isAsmJS() const { return kind == ModuleKind::AsmJS; } // A builtin module is a host constructed wasm module that exports host // functionality, using special opcodes. Otherwise, it has the same rules // as wasm modules and so it does not get a new ModuleKind. bool isBuiltinModule() const { return features().isBuiltinModule; } // All builtin modules are self-hosted, but not all self-hosted modules are // builtin modules. JS-PI and WebAssembly.Function also produce self-hosted // modules without the builtin module flag. bool isSelfHostedModule() const { return scriptedCaller().isSelfHosted(); }
private: // Allocate space for `bytes`@`align` in the instance, updating // `instanceDataLength` and returning the offset in in `assignedOffset`.
[[nodiscard]] bool allocateInstanceDataBytes(uint32_t bytes, uint32_t align,
uint32_t* assignedOffset); // The same for an array of allocations.
[[nodiscard]] bool allocateInstanceDataBytesN(uint32_t bytes, uint32_t align,
uint32_t count,
uint32_t* assignedOffset);
};
using MutableCodeMetadata = RefPtr<CodeMetadata>; using SharedCodeMetadata = RefPtr<const CodeMetadata>;
using InliningBudget = ExclusiveData<int64_t>;
// wasm::CodeTailMetadata contains all metadata needed by wasm::Code that is // only after the whole module has been downloaded. It is sometimes available // for Ion compilation, and never available for baseline compilation. struct CodeTailMetadata : public ShareableBase<CodeTailMetadata> { // Default initializer only used for serialization.
CodeTailMetadata();
// Initialize the metadata with a given wasm::CodeMetadata. explicit CodeTailMetadata(const CodeMetadata& codeMeta);
// The code metadata for this module.
SharedCodeMetadata codeMeta;
// The bytes for the code section.
SharedBytes codeSectionBytecode;
// Whether this module was compiled with debugging support. bool debugEnabled;
// A SHA-1 hash of the module bytecode for use in display urls. Only // available if we're debugging.
ModuleHash debugHash;
// The full bytecode for this module. Only available for debuggable modules.
BytecodeBuffer debugBytecode;
// Shared and mutable inlining budget for this module. mutable InliningBudget inliningBudget;
// The ranges of every function defined in this module.
BytecodeRangeVector funcDefRanges;
// The feature usage for every function defined in this module.
FeatureUsageVector funcDefFeatureUsages;
// Tracks the range of CallRefMetrics created for each function definition in // this module.
CallRefMetricsRangeVector funcDefCallRefs;
// Tracks the range of AllocSites created for each function definition in // this module. If we are compiling with a 'once' compilation and using just // ion, this will be empty and ion will instead use per-typedef alloc sites.
AllocSitesRangeVector funcDefAllocSites;
// An array of hints to use when compiling a call_ref. // // This is written into when an instance requests a function to be tiered up, // and read from our function compilers.
MutableCallRefHints callRefHints;
// nameSectionPayload points at the name section's CustomSection::payload so // that the Names (which are use payload-relative offsets) can be used // independently of the Module without duplicating the name section.
SharedBytes nameSectionPayload;
// The number of call ref metrics in Instance::callRefs_
uint32_t numCallRefMetrics;
// The number of AllocSites in Instance::allocSites_.
uint32_t numAllocSites;
using MutableCodeTailMetadata = RefPtr<CodeTailMetadata>; using SharedCodeTailMetadata = RefPtr<const CodeTailMetadata>;
// wasm::ModuleMetadata contains metadata whose lifetime ends at the same time // that the lifetime of wasm::Module ends. In practice that means metadata // that is needed only for creating wasm::Instances. Hence this metadata // conceptually belongs to, and is held alive by, wasm::Module.
struct ModuleMetadata : public ShareableBase<ModuleMetadata> { // NOTE: if you add, remove, rename or reorder fields here, be sure to // update CodeModuleMetadata() to keep it in sync.
// The subset of module metadata that is shared between a module and // instance (i.e. wasm::Code), and is available for all compilation. It // does not contain any data that is only available after the whole module // has been downloaded.
MutableCodeMetadata codeMeta;
// The subset of module metadata that is shared between a module and // instance (i.e. wasm::Code), and is only available after the whole module // has been downloaded.
MutableCodeTailMetadata codeTailMeta;
// Module fields decoded from the module environment (or initialized while // validating an asm.js module) and immutable during compilation:
ImportVector imports;
ExportVector exports;
// Info about elem segments needed for instantiation. Should have the same // length as CodeMetadata::elemSegmentTypes.
ModuleElemSegmentVector elemSegments;
// Info about data segments needed for instantiation. These wind up having // the same length. Initially both are empty. `dataSegmentRanges` is // filled in during validation, and `dataSegments` remains empty. Later, at // module-generation time, `dataSegments` is filled in, by copying the // underlying data blocks, and so the two vectors have the same length after // that.
DataSegmentRangeVector dataSegmentRanges;
DataSegmentVector dataSegments;
CustomSectionVector customSections;
// Which features were observed when compiling this module.
FeatureUsage featureUsage = FeatureUsage::None;
// Generates any new metadata necessary to compile this module. This must be // called after the 'module environment' (everything before the code section) // has been decoded.
[[nodiscard]] bool prepareForCompile(CompileMode mode) { return codeMeta->prepareForCompile(mode);
} bool isPreparedForCompile() const { return codeMeta->isPreparedForCompile(); }
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