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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.
#if !V8_ENABLE_WEBASSEMBLY
#error This header should only be included if WebAssembly is enabled.
#endif // !V8_ENABLE_WEBASSEMBLY
#ifndef V8_WASM_FUNCTION_COMPILER_H_
#define V8_WASM_FUNCTION_COMPILER_H_
#include <memory>
#include "src/codegen/assembler.h"
#include "src/codegen/code-desc.h"
#include "src/wasm/compilation-environment.h"
#include "src/wasm/function-body-decoder.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;
class TurbofanCompilationJob;
namespace wasm {
class NativeModule;
class WasmCode;
class WasmEngine;
struct WasmFunction;
// Stores assumptions that a Wasm compilation job made while executing,
// so they can be checked for continued validity when the job finishes.
class AssumptionsJournal {
public:
AssumptionsJournal() = default;
void RecordAssumption(uint32_t func_index, WellKnownImport status) {
imports_.push_back(std::make_pair(func_index, status));
}
const std::vector<std::pair<uint32_t, WellKnownImport>>& import_statuses() {
return imports_;
}
bool empty() const { return imports_.empty(); }
private:
// This is not particularly efficient, but it's probably good enough.
// For most compilations, this won't hold any entries. If it does
// hold entries, their number is expected to be small, because most
// functions don't call many imports, and many imports won't be
// specially recognized.
std::vector<std::pair<uint32_t, WellKnownImport>> imports_;
};
struct WasmCompilationResult {
public:
MOVE_ONLY_WITH_DEFAULT_CONSTRUCTORS(WasmCompilationResult);
enum Kind : int8_t {
kFunction,
kWasmToJsWrapper,
};
bool succeeded() const { return code_desc.buffer != nullptr; }
bool failed() const { return !succeeded(); }
explicit operator bool() const { return succeeded(); }
CodeDesc code_desc;
std::unique_ptr<AssemblerBuffer> instr_buffer;
uint32_t frame_slot_count = 0;
uint32_t tagged_parameter_slots = 0;
base::OwnedVector<uint8_t> source_positions;
base::OwnedVector<uint8_t> inlining_positions;
base::OwnedVector<uint8_t> protected_instructions_data;
std::unique_ptr<AssumptionsJournal> assumptions;
int func_index = kAnonymousFuncIndex;
ExecutionTier requested_tier;
ExecutionTier result_tier;
Kind kind = kFunction;
ForDebugging for_debugging = kNotForDebugging;
bool frame_has_feedback_slot = false;
};
class V8_EXPORT_PRIVATE WasmCompilationUnit final {
public:
WasmCompilationUnit(int index, ExecutionTier tier, ForDebugging for_debugging)
: func_index_(index), tier_(tier), for_debugging_(for_debugging) {
DCHECK_IMPLIES(for_debugging != ForDebugging::kNotForDebugging,
tier_ == ExecutionTier::kLiftoff);
}
WasmCompilationResult ExecuteCompilation(CompilationEnv*,
const WireBytesStorage*, Counters*,
WasmFeatures* detected);
ExecutionTier tier() const { return tier_; }
ForDebugging for_debugging() const { return for_debugging_; }
int func_index() const { return func_index_; }
static void CompileWasmFunction(Counters*, NativeModule*,
WasmFeatures* detected, const WasmFunction*,
ExecutionTier);
private:
WasmCompilationResult ExecuteFunctionCompilation(CompilationEnv*,
const WireBytesStorage*,
Counters*,
WasmFeatures* detected);
WasmCompilationResult ExecuteImportWrapperCompilation(CompilationEnv*);
int func_index_;
ExecutionTier tier_;
ForDebugging for_debugging_;
};
// {WasmCompilationUnit} should be trivially copyable and small enough so we can
// efficiently pass it by value.
ASSERT_TRIVIALLY_COPYABLE(WasmCompilationUnit);
static_assert(sizeof(WasmCompilationUnit) <= 2 * kSystemPointerSize);
class V8_EXPORT_PRIVATE JSToWasmWrapperCompilationUnit final {
public:
// A flag to mark whether the compilation unit can skip the compilation
// and return the builtin (generic) wrapper, when available.
enum AllowGeneric : bool { kAllowGeneric = true, kDontAllowGeneric = false };
JSToWasmWrapperCompilationUnit(Isolate* isolate, const FunctionSig* sig,
uint32_t canonical_sig_index,
const wasm::WasmModule* module, bool is_import,
WasmFeatures enabled_features,
AllowGeneric allow_generic);
~JSToWasmWrapperCompilationUnit();
Isolate* isolate() const { return isolate_; }
void Execute();
Handle<Code> Finalize();
bool is_import() const { return is_import_; }
const FunctionSig* sig() const { return sig_; }
uint32_t canonical_sig_index() const { return canonical_sig_index_; }
// Run a compilation unit synchronously.
static Handle<Code> CompileJSToWasmWrapper(Isolate* isolate,
const FunctionSig* sig,
uint32_t canonical_sig_index,
const WasmModule* module,
bool is_import);
// Run a compilation unit synchronously, but ask for the specific
// wrapper.
static Handle<Code> CompileSpecificJSToWasmWrapper(
Isolate* isolate, const FunctionSig* sig, uint32_t canonical_sig_index,
const WasmModule* module);
private:
// Wrapper compilation is bound to an isolate. Concurrent accesses to the
// isolate (during the "Execute" phase) must be audited carefully, i.e. we
// should only access immutable information (like the root table). The isolate
// is guaranteed to be alive when this unit executes.
Isolate* isolate_;
bool is_import_;
const FunctionSig* sig_;
uint32_t canonical_sig_index_;
bool use_generic_wrapper_;
std::unique_ptr<TurbofanCompilationJob> job_;
};
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_FUNCTION_COMPILER_H_
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