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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/base/platform/time.h"
#include "src/base/strings.h"
#include "src/codegen/compiler.h"
#include "src/codegen/macro-assembler-inl.h"
#include "src/codegen/optimized-compilation-info.h"
#include "src/compiler/wasm-compiler.h"
#include "src/diagnostics/code-tracer.h"
#include "src/logging/counters-scopes.h"
#include "src/logging/log.h"
#include "src/utils/ostreams.h"
#include "src/wasm/baseline/liftoff-compiler.h"
#include "src/wasm/wasm-code-manager.h"
#include "src/wasm/wasm-debug.h"
#include "src/wasm/wasm-engine.h"
namespace v8 {
namespace internal {
namespace wasm {
// static
ExecutionTier WasmCompilationUnit::GetBaselineExecutionTier(
const WasmModule* module) {
// Liftoff does not support the special asm.js opcodes, thus always compile
// asm.js modules with TurboFan.
if (is_asmjs_module(module)) return ExecutionTier::kTurbofan;
return FLAG_liftoff ? ExecutionTier::kLiftoff : ExecutionTier::kTurbofan;
}
WasmCompilationResult WasmCompilationUnit::ExecuteCompilation(
CompilationEnv* env, const WireBytesStorage* wire_bytes_storage,
Counters* counters, WasmFeatures* detected) {
WasmCompilationResult result;
if (func_index_ < static_cast<int>(env->module->num_imported_functions)) {
result = ExecuteImportWrapperCompilation(env);
} else {
result =
ExecuteFunctionCompilation(env, wire_bytes_storage, counters, detected);
}
if (result.succeeded() && counters) {
counters->wasm_generated_code_size()->Increment(
result.code_desc.instr_size);
counters->wasm_reloc_size()->Increment(result.code_desc.reloc_size);
}
result.func_index = func_index_;
result.requested_tier = tier_;
return result;
}
WasmCompilationResult WasmCompilationUnit::ExecuteImportWrapperCompilation(
CompilationEnv* env) {
const FunctionSig* sig = env->module->functions[func_index_].sig;
// Assume the wrapper is going to be a JS function with matching arity at
// instantiation time.
auto kind = compiler::kDefaultImportCallKind;
bool source_positions = is_asmjs_module(env->module);
WasmCompilationResult result = compiler::CompileWasmImportCallWrapper(
env, kind, sig, source_positions,
static_cast<int>(sig->parameter_count()));
return result;
}
WasmCompilationResult WasmCompilationUnit::ExecuteFunctionCompilation(
CompilationEnv* env, const WireBytesStorage* wire_bytes_storage,
Counters* counters, WasmFeatures* detected) {
auto* func = &env->module->functions[func_index_];
base::Vector<const uint8_t> code = wire_bytes_storage->GetCode(func->code);
wasm::FunctionBody func_body{func->sig, func->code.offset(), code.begin(),
code.end()};
base::Optional<TimedHistogramScope> wasm_compile_function_time_scope;
base::Optional<TimedHistogramScope> wasm_compile_huge_function_time_scope;
if (counters) {
if (func_body.end - func_body.start >= 100 * KB) {
auto huge_size_histogram = SELECT_WASM_COUNTER(
counters, env->module->origin, wasm, huge_function_size_bytes);
huge_size_histogram->AddSample(
static_cast<int>(func_body.end - func_body.start));
wasm_compile_huge_function_time_scope.emplace(
counters->wasm_compile_huge_function_time());
}
auto timed_histogram = SELECT_WASM_COUNTER(counters, env->module->origin,
wasm_compile, function_time);
wasm_compile_function_time_scope.emplace(timed_histogram);
}
if (FLAG_trace_wasm_compiler) {
PrintF("Compiling wasm function %d with %s\n", func_index_,
ExecutionTierToString(tier_));
}
WasmCompilationResult result;
switch (tier_) {
case ExecutionTier::kNone:
UNREACHABLE();
case ExecutionTier::kLiftoff:
// The --wasm-tier-mask-for-testing flag can force functions to be
// compiled with TurboFan, and the --wasm-debug-mask-for-testing can force
// them to be compiled for debugging, see documentation.
if (V8_LIKELY(FLAG_wasm_tier_mask_for_testing == 0) ||
func_index_ >= 32 ||
((FLAG_wasm_tier_mask_for_testing & (1 << func_index_)) == 0)) {
// We do not use the debug side table, we only (optionally) pass it to
// cover different code paths in Liftoff for testing.
std::unique_ptr<DebugSideTable> unused_debug_sidetable;
std::unique_ptr<DebugSideTable>* debug_sidetable_ptr = nullptr;
if (V8_UNLIKELY(func_index_ < 32 && (FLAG_wasm_debug_mask_for_testing &
(1 << func_index_)) != 0)) {
debug_sidetable_ptr = &unused_debug_sidetable;
}
result = ExecuteLiftoffCompilation(
env, func_body, func_index_, for_debugging_,
LiftoffOptions{}
.set_counters(counters)
.set_detected_features(detected)
.set_debug_sidetable(debug_sidetable_ptr));
if (result.succeeded()) break;
}
// If Liftoff failed, fall back to turbofan.
// TODO(wasm): We could actually stop or remove the tiering unit for this
// function to avoid compiling it twice with TurboFan.
V8_FALLTHROUGH;
case ExecutionTier::kTurbofan:
result = compiler::ExecuteTurbofanWasmCompilation(
env, func_body, func_index_, counters, detected);
result.for_debugging = for_debugging_;
break;
}
return result;
}
namespace {
bool must_record_function_compilation(Isolate* isolate) {
return isolate->logger()->is_listening_to_code_events() ||
isolate->is_profiling();
}
PRINTF_FORMAT(3, 4)
void RecordWasmHeapStubCompilation(Isolate* isolate, Handle<Code> code,
const char* format, ...) {
DCHECK(must_record_function_compilation(isolate));
base::ScopedVector<char> buffer(128);
va_list arguments;
va_start(arguments, format);
int len = base::VSNPrintF(buffer, format, arguments);
CHECK_LT(0, len);
va_end(arguments);
Handle<String> name_str =
isolate->factory()->NewStringFromAsciiChecked(buffer.begin());
PROFILE(isolate, CodeCreateEvent(CodeEventListener::STUB_TAG,
Handle<AbstractCode>::cast(code), name_str));
}
} // namespace
// static
void WasmCompilationUnit::CompileWasmFunction(Isolate* isolate,
NativeModule* native_module,
WasmFeatures* detected,
const WasmFunction* function,
ExecutionTier tier) {
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()};
DCHECK_LE(native_module->num_imported_functions(), function->func_index);
DCHECK_LT(function->func_index, native_module->num_functions());
WasmCompilationUnit unit(function->func_index, tier, kNoDebugging);
CompilationEnv env = native_module->CreateCompilationEnv();
WasmCompilationResult result = unit.ExecuteCompilation(
&env, native_module->compilation_state()->GetWireBytesStorage().get(),
isolate->counters(), detected);
if (result.succeeded()) {
WasmCodeRefScope code_ref_scope;
native_module->PublishCode(
native_module->AddCompiledCode(std::move(result)));
} else {
native_module->compilation_state()->SetError();
}
}
namespace {
bool UseGenericWrapper(const FunctionSig* sig) {
#if V8_TARGET_ARCH_X64
if (sig->returns().size() > 1) {
return false;
}
if (sig->returns().size() == 1 && sig->GetReturn(0).kind() != kI32 &&
sig->GetReturn(0).kind() != kI64 && sig->GetReturn(0).kind() != kF32 &&
sig->GetReturn(0).kind() != kF64) {
return false;
}
for (ValueType type : sig->parameters()) {
if (type.kind() != kI32 && type.kind() != kI64 && type.kind() != kF32 &&
type.kind() != kF64) {
return false;
}
}
return FLAG_wasm_generic_wrapper;
#else
return false;
#endif
}
} // namespace
JSToWasmWrapperCompilationUnit::JSToWasmWrapperCompilationUnit(
Isolate* isolate, const FunctionSig* sig, const WasmModule* module,
bool is_import, const WasmFeatures& enabled_features,
AllowGeneric allow_generic)
: isolate_(isolate),
is_import_(is_import),
sig_(sig),
use_generic_wrapper_(allow_generic && UseGenericWrapper(sig) &&
!is_import),
job_(use_generic_wrapper_
? nullptr
: compiler::NewJSToWasmCompilationJob(
isolate, sig, module, is_import, enabled_features)) {}
JSToWasmWrapperCompilationUnit::~JSToWasmWrapperCompilationUnit() = default;
void JSToWasmWrapperCompilationUnit::Execute() {
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.wasm.detailed"),
"wasm.CompileJSToWasmWrapper");
if (!use_generic_wrapper_) {
CompilationJob::Status status = job_->ExecuteJob(nullptr);
CHECK_EQ(status, CompilationJob::SUCCEEDED);
}
}
Handle<Code> JSToWasmWrapperCompilationUnit::Finalize() {
Handle<Code> code;
if (use_generic_wrapper_) {
code = isolate_->builtins()->code_handle(Builtin::kGenericJSToWasmWrapper);
} else {
CompilationJob::Status status = job_->FinalizeJob(isolate_);
CHECK_EQ(status, CompilationJob::SUCCEEDED);
code = job_->compilation_info()->code();
}
if (!use_generic_wrapper_ && must_record_function_compilation(isolate_)) {
RecordWasmHeapStubCompilation(
isolate_, code, "%s", job_->compilation_info()->GetDebugName().get());
}
return code;
}
// static
Handle<Code> JSToWasmWrapperCompilationUnit::CompileJSToWasmWrapper(
Isolate* isolate, const FunctionSig* sig, const WasmModule* module,
bool is_import) {
// Run the compilation unit synchronously.
WasmFeatures enabled_features = WasmFeatures::FromIsolate(isolate);
JSToWasmWrapperCompilationUnit unit(isolate, sig, module, is_import,
enabled_features, kAllowGeneric);
unit.Execute();
return unit.Finalize();
}
// static
Handle<Code> JSToWasmWrapperCompilationUnit::CompileSpecificJSToWasmWrapper(
Isolate* isolate, const FunctionSig* sig, const WasmModule* module) {
// Run the compilation unit synchronously.
const bool is_import = false;
WasmFeatures enabled_features = WasmFeatures::FromIsolate(isolate);
JSToWasmWrapperCompilationUnit unit(isolate, sig, module, is_import,
enabled_features, kDontAllowGeneric);
unit.Execute();
return unit.Finalize();
}
} // namespace wasm
} // namespace internal
} // namespace v8
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