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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:
* Copyright 2015 Mozilla Foundation
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#ifndef wasm_compile_h
#define wasm_compile_h
#include "wasm/WasmModule.h"
namespace js {
namespace wasm {
// Return a uint32_t which captures the observed properties of the CPU that
// affect compilation. If code compiled now is to be serialized and executed
// later, the ObservedCPUFeatures() must be ensured to be the same.
uint32_t ObservedCPUFeatures();
// Describes the JS scripted caller of a request to compile a wasm module.
struct ScriptedCaller {
UniqueChars filename;
bool filenameIsURL;
unsigned line;
ScriptedCaller() : filenameIsURL(false), line(0) {}
// Describes all the parameters that control wasm compilation.
struct CompileArgs;
using MutableCompileArgs = RefPtr<CompileArgs>;
using SharedCompileArgs = RefPtr<const CompileArgs>;
struct CompileArgs : ShareableBase<CompileArgs> {
ScriptedCaller scriptedCaller;
UniqueChars sourceMapURL;
bool baselineEnabled;
bool ionEnabled;
bool craneliftEnabled;
bool debugEnabled;
bool sharedMemoryEnabled;
bool forceTiering;
bool reftypesEnabled;
bool gcEnabled;
bool hugeMemory;
bool multiValuesEnabled;
bool v128Enabled;
// CompileArgs has two constructors:
// - one through a factory function `build`, which checks that flags are
// consistent with each other.
// - one that gives complete access to underlying fields.
// You should use the first one in general, unless you have a very good
// reason (i.e. no JSContext around and you know which flags have been used).
static SharedCompileArgs build(JSContext* cx,
ScriptedCaller&& scriptedCaller);
explicit CompileArgs(ScriptedCaller&& scriptedCaller)
: scriptedCaller(std::move(scriptedCaller)),
v128Enabled(false) {}
// Return the estimated compiled (machine) code size for the given bytecode size
// compiled at the given tier.
double EstimateCompiledCodeSize(Tier tier, size_t bytecodeSize);
// Compile the given WebAssembly bytecode with the given arguments into a
// wasm::Module. On success, the Module is returned. On failure, the returned
// SharedModule pointer is null and either:
// - *error points to a string description of the error
// - *error is null and the caller should report out-of-memory.
SharedModule CompileBuffer(const CompileArgs& args,
const ShareableBytes& bytecode, UniqueChars* error,
UniqueCharsVector* warnings,
JS::OptimizedEncodingListener* listener = nullptr);
// Attempt to compile the second tier of the given wasm::Module.
void CompileTier2(const CompileArgs& args, const Bytes& bytecode,
const Module& module, Atomic<bool>* cancelled);
// Compile the given WebAssembly module which has been broken into three
// partitions:
// - envBytes contains a complete ModuleEnvironment that has already been
// copied in from the stream.
// - codeBytes is pre-sized to hold the complete code section when the stream
// completes.
// - The range [codeBytes.begin(), codeBytesEnd) contains the bytes currently
// read from the stream and codeBytesEnd will advance until either
// the stream is cancelled or codeBytesEnd == codeBytes.end().
// - streamEnd contains the final information received after the code section:
// the remaining module bytecodes and maybe a JS::OptimizedEncodingListener.
// When the stream is successfully closed, streamEnd.reached is set.
// The ExclusiveWaitableData are notified when CompileStreaming() can make
// progress (i.e., codeBytesEnd advances or streamEnd.reached is set).
// If cancelled is set to true, compilation aborts and returns null. After
// cancellation is set, both ExclusiveWaitableData will be notified and so every
// wait() loop must check cancelled.
using ExclusiveBytesPtr = ExclusiveWaitableData<const uint8_t*>;
struct StreamEndData {
bool reached;
const Bytes* tailBytes;
Tier2Listener tier2Listener;
StreamEndData() : reached(false) {}
using ExclusiveStreamEndData = ExclusiveWaitableData<StreamEndData>;
SharedModule CompileStreaming(const CompileArgs& args, const Bytes& envBytes,
const Bytes& codeBytes,
const ExclusiveBytesPtr& codeBytesEnd,
const ExclusiveStreamEndData& streamEnd,
const Atomic<bool>& cancelled, UniqueChars* error,
UniqueCharsVector* warnings);
} // namespace wasm
} // namespace js
#endif // namespace wasm_compile_h