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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.
#include "src/wasm/function-compiler.h"
#include "src/compiler/wasm-compiler.h"
#include "src/counters.h"
#include "src/macro-assembler-inl.h"
#include "src/wasm/baseline/liftoff-compiler.h"
#include "src/wasm/wasm-code-manager.h"
namespace v8 {
namespace internal {
namespace wasm {
namespace {
const char* GetExecutionTierAsString(ExecutionTier mode) {
switch (mode) {
case ExecutionTier::kBaseline:
return "liftoff";
case ExecutionTier::kOptimized:
return "turbofan";
case ExecutionTier::kInterpreter:
return "interpreter";
}
UNREACHABLE();
}
void RecordStats(const WasmCode* code, Counters* counters) {
counters->wasm_generated_code_size()->Increment(
static_cast<int>(code->instructions().size()));
counters->wasm_reloc_size()->Increment(
static_cast<int>(code->reloc_info().size()));
}
} // namespace
// static
ExecutionTier WasmCompilationUnit::GetDefaultExecutionTier() {
return FLAG_liftoff ? ExecutionTier::kBaseline : ExecutionTier::kOptimized;
}
WasmCompilationUnit::WasmCompilationUnit(WasmEngine* wasm_engine,
ModuleEnv* env,
NativeModule* native_module,
FunctionBody body, int index,
Counters* counters, ExecutionTier mode)
: env_(env),
wasm_engine_(wasm_engine),
func_body_(body),
counters_(counters),
func_index_(index),
native_module_(native_module),
mode_(mode) {
DCHECK_GE(index, env->module->num_imported_functions);
DCHECK_LT(index, env->module->functions.size());
// Always disable Liftoff for asm.js, for two reasons:
// 1) asm-specific opcodes are not implemented, and
// 2) tier-up does not work with lazy compilation.
if (env->module->origin == kAsmJsOrigin) mode = ExecutionTier::kOptimized;
if (V8_UNLIKELY(FLAG_wasm_tier_mask_for_testing) && index < 32 &&
(FLAG_wasm_tier_mask_for_testing & (1 << index))) {
mode = ExecutionTier::kOptimized;
}
SwitchMode(mode);
}
// Declared here such that {LiftoffCompilationUnit} and
// {TurbofanWasmCompilationUnit} can be opaque in the header file.
WasmCompilationUnit::~WasmCompilationUnit() = default;
void WasmCompilationUnit::ExecuteCompilation(WasmFeatures* detected) {
auto size_histogram = SELECT_WASM_COUNTER(counters_, env_->module->origin,
wasm, function_size_bytes);
size_histogram->AddSample(
static_cast<int>(func_body_.end - func_body_.start));
auto timed_histogram = SELECT_WASM_COUNTER(counters_, env_->module->origin,
wasm_compile, function_time);
TimedHistogramScope wasm_compile_function_time_scope(timed_histogram);
if (FLAG_trace_wasm_compiler) {
PrintF("Compiling wasm function %d with %s\n\n", func_index_,
GetExecutionTierAsString(mode_));
}
switch (mode_) {
case ExecutionTier::kBaseline:
if (liftoff_unit_->ExecuteCompilation(detected)) break;
// Otherwise, fall back to turbofan.
SwitchMode(ExecutionTier::kOptimized);
V8_FALLTHROUGH;
case ExecutionTier::kOptimized:
turbofan_unit_->ExecuteCompilation(detected);
break;
case ExecutionTier::kInterpreter:
UNREACHABLE(); // TODO(titzer): compile interpreter entry stub.
}
}
WasmCode* WasmCompilationUnit::FinishCompilation(ErrorThrower* thrower) {
WasmCode* ret;
switch (mode_) {
case ExecutionTier::kBaseline:
ret = liftoff_unit_->FinishCompilation(thrower);
break;
case ExecutionTier::kOptimized:
ret = turbofan_unit_->FinishCompilation(thrower);
break;
case ExecutionTier::kInterpreter:
UNREACHABLE(); // TODO(titzer): finish interpreter entry stub.
}
if (ret == nullptr) {
thrower->RuntimeError("Error finalizing code.");
} else {
RecordStats(ret, counters_);
}
return ret;
}
void WasmCompilationUnit::SwitchMode(ExecutionTier new_mode) {
// This method is being called in the constructor, where neither
// {liftoff_unit_} nor {turbofan_unit_} are set, or to switch mode from
// kLiftoff to kTurbofan, in which case {liftoff_unit_} is already set.
mode_ = new_mode;
switch (new_mode) {
case ExecutionTier::kBaseline:
DCHECK(!turbofan_unit_);
DCHECK(!liftoff_unit_);
liftoff_unit_.reset(new LiftoffCompilationUnit(this));
return;
case ExecutionTier::kOptimized:
DCHECK(!turbofan_unit_);
liftoff_unit_.reset();
turbofan_unit_.reset(new compiler::TurbofanWasmCompilationUnit(this));
return;
case ExecutionTier::kInterpreter:
UNREACHABLE(); // TODO(titzer): allow compiling interpreter entry stub.
}
UNREACHABLE();
}
// static
WasmCode* WasmCompilationUnit::CompileWasmFunction(
Isolate* isolate, NativeModule* native_module, WasmFeatures* detected,
ErrorThrower* thrower, ModuleEnv* env, const WasmFunction* function,
ExecutionTier mode) {
ModuleWireBytes wire_bytes(native_module->wire_bytes());
FunctionBody function_body{function->sig, function->code.offset(),
wire_bytes.start() + function->code.offset(),
wire_bytes.start() + function->code.end_offset()};
WasmCompilationUnit unit(isolate->wasm_engine(), env, native_module,
function_body,
function->func_index, isolate->counters(), mode);
unit.ExecuteCompilation(detected);
return unit.FinishCompilation(thrower);
}
} // namespace wasm
} // namespace internal
} // namespace v8
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