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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_WASM_COMPILATION_ENVIRONMENT_H_
#define V8_WASM_COMPILATION_ENVIRONMENT_H_
#include <memory>
#include "src/wasm/wasm-features.h"
#include "src/wasm/wasm-limits.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-tier.h"
namespace v8 {
namespace internal {
class Counters;
namespace wasm {
class NativeModule;
class WasmCode;
class WasmError;
enum RuntimeExceptionSupport : bool {
kRuntimeExceptionSupport = true,
kNoRuntimeExceptionSupport = false
};
enum UseTrapHandler : bool { kUseTrapHandler = true, kNoTrapHandler = false };
enum LowerSimd : bool { kLowerSimd = true, kNoLowerSimd = false };
// The {CompilationEnv} encapsulates the module data that is used during
// compilation. CompilationEnvs are shareable across multiple compilations.
struct CompilationEnv {
// A pointer to the decoded module's static representation.
const WasmModule* const module;
// True if trap handling should be used in compiled code, rather than
// compiling in bounds checks for each memory access.
const UseTrapHandler use_trap_handler;
// If the runtime doesn't support exception propagation,
// we won't generate stack checks, and trap handling will also
// be generated differently.
const RuntimeExceptionSupport runtime_exception_support;
// The smallest size of any memory that could be used with this module, in
// bytes.
const uint64_t min_memory_size;
// The largest size of any memory that could be used with this module, in
// bytes.
const uint64_t max_memory_size;
// Features enabled for this compilation.
const WasmFeatures enabled_features;
const LowerSimd lower_simd;
constexpr CompilationEnv(const WasmModule* module,
UseTrapHandler use_trap_handler,
RuntimeExceptionSupport runtime_exception_support,
const WasmFeatures& enabled_features,
LowerSimd lower_simd = kNoLowerSimd)
: module(module),
use_trap_handler(use_trap_handler),
runtime_exception_support(runtime_exception_support),
min_memory_size(module ? module->initial_pages * uint64_t{kWasmPageSize}
: 0),
max_memory_size((module && module->has_maximum_pages
? module->maximum_pages
: kV8MaxWasmMemoryPages) *
uint64_t{kWasmPageSize}),
enabled_features(enabled_features),
lower_simd(lower_simd) {}
};
// The wire bytes are either owned by the StreamingDecoder, or (after streaming)
// by the NativeModule. This class abstracts over the storage location.
class WireBytesStorage {
public:
virtual ~WireBytesStorage() = default;
virtual Vector<const uint8_t> GetCode(WireBytesRef) const = 0;
};
// Callbacks will receive either {kFailedCompilation} or both
// {kFinishedBaselineCompilation} and {kFinishedTopTierCompilation}, in that
// order. If tier up is off, both events are delivered right after each other.
enum class CompilationEvent : uint8_t {
kFinishedBaselineCompilation,
kFinishedTopTierCompilation,
kFailedCompilation,
// Marker:
// After an event >= kFirstFinalEvent, no further events are generated.
kFirstFinalEvent = kFinishedTopTierCompilation
};
// The implementation of {CompilationState} lives in module-compiler.cc.
// This is the PIMPL interface to that private class.
class CompilationState {
public:
using callback_t = std::function<void(CompilationEvent)>;
~CompilationState();
void AbortCompilation();
void SetError();
void SetWireBytesStorage(std::shared_ptr<WireBytesStorage>);
V8_EXPORT_PRIVATE std::shared_ptr<WireBytesStorage> GetWireBytesStorage()
const;
void AddCallback(callback_t);
bool failed() const;
V8_EXPORT_PRIVATE bool baseline_compilation_finished() const;
V8_EXPORT_PRIVATE bool top_tier_compilation_finished() const;
// Override {operator delete} to avoid implicit instantiation of {operator
// delete} with {size_t} argument. The {size_t} argument would be incorrect.
void operator delete(void* ptr) { ::operator delete(ptr); }
private:
// NativeModule is allowed to call the static {New} method.
friend class NativeModule;
CompilationState() = delete;
// The CompilationState keeps a {std::weak_ptr} back to the {NativeModule}
// such that it can keep it alive (by regaining a {std::shared_ptr}) in
// certain scopes.
static std::unique_ptr<CompilationState> New(
const std::shared_ptr<NativeModule>&, std::shared_ptr<Counters>);
};
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_COMPILATION_ENVIRONMENT_H_