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// Copyright 2015 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/interpreter/interpreter.h"
#include <fstream>
#include <memory>
#include "builtins-generated/bytecodes-builtins-list.h"
#include "src/ast/prettyprinter.h"
#include "src/ast/scopes.h"
#include "src/codegen/compiler.h"
#include "src/codegen/unoptimized-compilation-info.h"
#include "src/execution/local-isolate.h"
#include "src/heap/parked-scope.h"
#include "src/init/bootstrapper.h"
#include "src/init/setup-isolate.h"
#include "src/interpreter/bytecode-generator.h"
#include "src/interpreter/bytecodes.h"
#include "src/logging/runtime-call-stats-scope.h"
#include "src/objects/objects-inl.h"
#include "src/objects/shared-function-info.h"
#include "src/objects/slots.h"
#include "src/objects/visitors.h"
#include "src/parsing/parse-info.h"
#include "src/snapshot/snapshot.h"
#include "src/utils/ostreams.h"
namespace v8 {
namespace internal {
namespace interpreter {
class InterpreterCompilationJob final : public UnoptimizedCompilationJob {
public:
InterpreterCompilationJob(ParseInfo* parse_info, FunctionLiteral* literal,
AccountingAllocator* allocator,
std::vector<FunctionLiteral*>* eager_inner_literals,
LocalIsolate* local_isolate);
InterpreterCompilationJob(const InterpreterCompilationJob&) = delete;
InterpreterCompilationJob& operator=(const InterpreterCompilationJob&) =
delete;
protected:
Status ExecuteJobImpl() final;
Status FinalizeJobImpl(Handle<SharedFunctionInfo> shared_info,
Isolate* isolate) final;
Status FinalizeJobImpl(Handle<SharedFunctionInfo> shared_info,
LocalIsolate* isolate) final;
private:
BytecodeGenerator* generator() { return &generator_; }
template <typename IsolateT>
void CheckAndPrintBytecodeMismatch(IsolateT* isolate, Handle<Script> script,
Handle<BytecodeArray> bytecode);
template <typename IsolateT>
Status DoFinalizeJobImpl(Handle<SharedFunctionInfo> shared_info,
IsolateT* isolate);
Zone zone_;
UnoptimizedCompilationInfo compilation_info_;
LocalIsolate* local_isolate_;
BytecodeGenerator generator_;
};
Interpreter::Interpreter(Isolate* isolate)
: isolate_(isolate),
interpreter_entry_trampoline_instruction_start_(kNullAddress) {
memset(dispatch_table_, 0, sizeof(dispatch_table_));
if (V8_IGNITION_DISPATCH_COUNTING_BOOL) {
InitDispatchCounters();
}
}
void Interpreter::InitDispatchCounters() {
static const int kBytecodeCount = static_cast<int>(Bytecode::kLast) + 1;
bytecode_dispatch_counters_table_.reset(
new uintptr_t[kBytecodeCount * kBytecodeCount]);
memset(bytecode_dispatch_counters_table_.get(), 0,
sizeof(uintptr_t) * kBytecodeCount * kBytecodeCount);
}
namespace {
Builtin BuiltinIndexFromBytecode(Bytecode bytecode,
OperandScale operand_scale) {
int index = static_cast<int>(bytecode);
if (operand_scale == OperandScale::kSingle) {
if (Bytecodes::IsShortStar(bytecode)) {
index = static_cast<int>(Bytecode::kFirstShortStar);
} else if (bytecode > Bytecode::kLastShortStar) {
// Adjust the index due to repeated handlers.
index -= Bytecodes::kShortStarCount - 1;
}
} else {
// The table contains uint8_t offsets starting at 0 with
// kIllegalBytecodeHandlerEncoding for illegal bytecode/scale combinations.
uint8_t offset = kWideBytecodeToBuiltinsMapping[index];
if (offset == kIllegalBytecodeHandlerEncoding) {
return Builtin::kIllegalHandler;
} else {
index = kNumberOfBytecodeHandlers + offset;
if (operand_scale == OperandScale::kQuadruple) {
index += kNumberOfWideBytecodeHandlers;
}
}
}
return Builtins::FromInt(static_cast<int>(Builtin::kFirstBytecodeHandler) +
index);
}
} // namespace
Code Interpreter::GetBytecodeHandler(Bytecode bytecode,
OperandScale operand_scale) {
Builtin builtin = BuiltinIndexFromBytecode(bytecode, operand_scale);
return isolate_->builtins()->code(builtin);
}
void Interpreter::SetBytecodeHandler(Bytecode bytecode,
OperandScale operand_scale, Code handler) {
DCHECK(handler.is_off_heap_trampoline());
DCHECK(handler.kind() == CodeKind::BYTECODE_HANDLER);
size_t index = GetDispatchTableIndex(bytecode, operand_scale);
dispatch_table_[index] = handler.InstructionStart();
}
// static
size_t Interpreter::GetDispatchTableIndex(Bytecode bytecode,
OperandScale operand_scale) {
static const size_t kEntriesPerOperandScale = 1u << kBitsPerByte;
size_t index = static_cast<size_t>(bytecode);
return index + BytecodeOperands::OperandScaleAsIndex(operand_scale) *
kEntriesPerOperandScale;
}
namespace {
void MaybePrintAst(ParseInfo* parse_info,
UnoptimizedCompilationInfo* compilation_info) {
if (!FLAG_print_ast) return;
StdoutStream os;
std::unique_ptr<char[]> name = compilation_info->literal()->GetDebugName();
os << "[generating bytecode for function: " << name.get() << "]" << std::endl;
#ifdef DEBUG
os << "--- AST ---" << std::endl
<< AstPrinter(parse_info->stack_limit())
.PrintProgram(compilation_info->literal())
<< std::endl;
#endif // DEBUG
}
bool ShouldPrintBytecode(Handle<SharedFunctionInfo> shared) {
if (!FLAG_print_bytecode) return false;
// Checks whether function passed the filter.
if (shared->is_toplevel()) {
base::Vector<const char> filter =
base::CStrVector(FLAG_print_bytecode_filter);
return (filter.length() == 0) || (filter.length() == 1 && filter[0] == '*');
} else {
return shared->PassesFilter(FLAG_print_bytecode_filter);
}
}
} // namespace
InterpreterCompilationJob::InterpreterCompilationJob(
ParseInfo* parse_info, FunctionLiteral* literal,
AccountingAllocator* allocator,
std::vector<FunctionLiteral*>* eager_inner_literals,
LocalIsolate* local_isolate)
: UnoptimizedCompilationJob(parse_info->stack_limit(), parse_info,
&compilation_info_),
zone_(allocator, ZONE_NAME),
compilation_info_(&zone_, parse_info, literal),
local_isolate_(local_isolate),
generator_(&zone_, &compilation_info_, parse_info->ast_string_constants(),
eager_inner_literals) {}
InterpreterCompilationJob::Status InterpreterCompilationJob::ExecuteJobImpl() {
RCS_SCOPE(parse_info()->runtime_call_stats(),
RuntimeCallCounterId::kCompileIgnition,
RuntimeCallStats::kThreadSpecific);
// TODO(lpy): add support for background compilation RCS trace.
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.CompileIgnition");
// Print AST if flag is enabled. Note, if compiling on a background thread
// then ASTs from different functions may be intersperse when printed.
{
DisallowGarbageCollection no_heap_access;
MaybePrintAst(parse_info(), compilation_info());
}
base::Optional<ParkedScope> parked_scope;
if (local_isolate_) parked_scope.emplace(local_isolate_);
generator()->GenerateBytecode(stack_limit());
if (generator()->HasStackOverflow()) {
return FAILED;
}
return SUCCEEDED;
}
#ifdef DEBUG
template <typename IsolateT>
void InterpreterCompilationJob::CheckAndPrintBytecodeMismatch(
IsolateT* isolate, Handle<Script> script, Handle<BytecodeArray> bytecode) {
int first_mismatch = generator()->CheckBytecodeMatches(*bytecode);
if (first_mismatch >= 0) {
parse_info()->ast_value_factory()->Internalize(isolate);
DeclarationScope::AllocateScopeInfos(parse_info(), isolate);
Handle<BytecodeArray> new_bytecode =
generator()->FinalizeBytecode(isolate, script);
std::cerr << "Bytecode mismatch";
#ifdef OBJECT_PRINT
std::cerr << " found for function: ";
MaybeHandle<String> maybe_name = parse_info()->literal()->GetName(isolate);
Handle<String> name;
if (maybe_name.ToHandle(&name) && name->length() != 0) {
name->PrintUC16(std::cerr);
} else {
std::cerr << "anonymous";
}
Object script_name = script->GetNameOrSourceURL();
if (script_name.IsString()) {
std::cerr << " ";
String::cast(script_name).PrintUC16(std::cerr);
std::cerr << ":" << parse_info()->literal()->start_position();
}
#endif
std::cerr << "\nOriginal bytecode:\n";
bytecode->Disassemble(std::cerr);
std::cerr << "\nNew bytecode:\n";
new_bytecode->Disassemble(std::cerr);
FATAL("Bytecode mismatch at offset %d\n", first_mismatch);
}
}
#endif
InterpreterCompilationJob::Status InterpreterCompilationJob::FinalizeJobImpl(
Handle<SharedFunctionInfo> shared_info, Isolate* isolate) {
RCS_SCOPE(parse_info()->runtime_call_stats(),
RuntimeCallCounterId::kCompileIgnitionFinalization);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
"V8.CompileIgnitionFinalization");
return DoFinalizeJobImpl(shared_info, isolate);
}
InterpreterCompilationJob::Status InterpreterCompilationJob::FinalizeJobImpl(
Handle<SharedFunctionInfo> shared_info, LocalIsolate* isolate) {
RCS_SCOPE(parse_info()->runtime_call_stats(),
RuntimeCallCounterId::kCompileBackgroundIgnitionFinalization);
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"),
"V8.CompileIgnitionFinalization");
return DoFinalizeJobImpl(shared_info, isolate);
}
template <typename IsolateT>
InterpreterCompilationJob::Status InterpreterCompilationJob::DoFinalizeJobImpl(
Handle<SharedFunctionInfo> shared_info, IsolateT* isolate) {
Handle<BytecodeArray> bytecodes = compilation_info_.bytecode_array();
if (bytecodes.is_null()) {
bytecodes = generator()->FinalizeBytecode(
isolate, handle(Script::cast(shared_info->script()), isolate));
if (generator()->HasStackOverflow()) {
return FAILED;
}
compilation_info()->SetBytecodeArray(bytecodes);
}
if (compilation_info()->SourcePositionRecordingMode() ==
SourcePositionTableBuilder::RecordingMode::RECORD_SOURCE_POSITIONS) {
Handle<ByteArray> source_position_table =
generator()->FinalizeSourcePositionTable(isolate);
bytecodes->set_source_position_table(*source_position_table, kReleaseStore);
}
if (ShouldPrintBytecode(shared_info)) {
StdoutStream os;
std::unique_ptr<char[]> name =
compilation_info()->literal()->GetDebugName();
os << "[generated bytecode for function: " << name.get() << " ("
<< shared_info << ")]" << std::endl;
os << "Bytecode length: " << bytecodes->length() << std::endl;
bytecodes->Disassemble(os);
os << std::flush;
}
#ifdef DEBUG
CheckAndPrintBytecodeMismatch(
isolate, handle(Script::cast(shared_info->script()), isolate), bytecodes);
#endif
return SUCCEEDED;
}
std::unique_ptr<UnoptimizedCompilationJob> Interpreter::NewCompilationJob(
ParseInfo* parse_info, FunctionLiteral* literal,
AccountingAllocator* allocator,
std::vector<FunctionLiteral*>* eager_inner_literals,
LocalIsolate* local_isolate) {
return std::make_unique<InterpreterCompilationJob>(
parse_info, literal, allocator, eager_inner_literals, local_isolate);
}
std::unique_ptr<UnoptimizedCompilationJob>
Interpreter::NewSourcePositionCollectionJob(
ParseInfo* parse_info, FunctionLiteral* literal,
Handle<BytecodeArray> existing_bytecode, AccountingAllocator* allocator,
LocalIsolate* local_isolate) {
auto job = std::make_unique<InterpreterCompilationJob>(
parse_info, literal, allocator, nullptr, local_isolate);
job->compilation_info()->SetBytecodeArray(existing_bytecode);
return job;
}
void Interpreter::ForEachBytecode(
const std::function<void(Bytecode, OperandScale)>& f) {
constexpr OperandScale kOperandScales[] = {
#define VALUE(Name, _) OperandScale::k##Name,
OPERAND_SCALE_LIST(VALUE)
#undef VALUE
};
for (OperandScale operand_scale : kOperandScales) {
for (int i = 0; i < Bytecodes::kBytecodeCount; i++) {
f(Bytecodes::FromByte(i), operand_scale);
}
}
}
void Interpreter::Initialize() {
Builtins* builtins = isolate_->builtins();
// Set the interpreter entry trampoline entry point now that builtins are
// initialized.
Handle<Code> code = BUILTIN_CODE(isolate_, InterpreterEntryTrampoline);
DCHECK(builtins->is_initialized());
DCHECK(code->is_off_heap_trampoline() ||
isolate_->heap()->IsImmovable(*code));
interpreter_entry_trampoline_instruction_start_ = code->InstructionStart();
// Initialize the dispatch table.
ForEachBytecode([=](Bytecode bytecode, OperandScale operand_scale) {
Builtin builtin = BuiltinIndexFromBytecode(bytecode, operand_scale);
Code handler = builtins->code(builtin);
if (Bytecodes::BytecodeHasHandler(bytecode, operand_scale)) {
#ifdef DEBUG
std::string builtin_name(Builtins::name(builtin));
std::string expected_name =
(Bytecodes::IsShortStar(bytecode)
? "ShortStar"
: Bytecodes::ToString(bytecode, operand_scale, "")) +
"Handler";
DCHECK_EQ(expected_name, builtin_name);
#endif
}
SetBytecodeHandler(bytecode, operand_scale, handler);
});
DCHECK(IsDispatchTableInitialized());
}
bool Interpreter::IsDispatchTableInitialized() const {
return dispatch_table_[0] != kNullAddress;
}
const char* Interpreter::LookupNameOfBytecodeHandler(const Code code) {
if (code.kind() == CodeKind::BYTECODE_HANDLER) {
return Builtins::name(code.builtin_id());
}
return nullptr;
}
uintptr_t Interpreter::GetDispatchCounter(Bytecode from, Bytecode to) const {
int from_index = Bytecodes::ToByte(from);
int to_index = Bytecodes::ToByte(to);
CHECK_WITH_MSG(bytecode_dispatch_counters_table_ != nullptr,
"Dispatch counters require building with "
"v8_enable_ignition_dispatch_counting");
return bytecode_dispatch_counters_table_[from_index * kNumberOfBytecodes +
to_index];
}
Local<v8::Object> Interpreter::GetDispatchCountersObject() {
v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(isolate_);
Local<v8::Context> context = isolate->GetCurrentContext();
Local<v8::Object> counters_map = v8::Object::New(isolate);
// Output is a JSON-encoded object of objects.
//
// The keys on the top level object are source bytecodes,
// and corresponding value are objects. Keys on these last are the
// destinations of the dispatch and the value associated is a counter for
// the correspondent source-destination dispatch chain.
//
// Only non-zero counters are written to file, but an entry in the top-level
// object is always present, even if the value is empty because all counters
// for that source are zero.
for (int from_index = 0; from_index < kNumberOfBytecodes; ++from_index) {
Bytecode from_bytecode = Bytecodes::FromByte(from_index);
Local<v8::Object> counters_row = v8::Object::New(isolate);
for (int to_index = 0; to_index < kNumberOfBytecodes; ++to_index) {
Bytecode to_bytecode = Bytecodes::FromByte(to_index);
uintptr_t counter = GetDispatchCounter(from_bytecode, to_bytecode);
if (counter > 0) {
std::string to_name = Bytecodes::ToString(to_bytecode);
Local<v8::String> to_name_object =
v8::String::NewFromUtf8(isolate, to_name.c_str()).ToLocalChecked();
Local<v8::Number> counter_object = v8::Number::New(isolate, counter);
CHECK(counters_row
->DefineOwnProperty(context, to_name_object, counter_object)
.IsJust());
}
}
std::string from_name = Bytecodes::ToString(from_bytecode);
Local<v8::String> from_name_object =
v8::String::NewFromUtf8(isolate, from_name.c_str()).ToLocalChecked();
CHECK(
counters_map->DefineOwnProperty(context, from_name_object, counters_row)
.IsJust());
}
return counters_map;
}
} // namespace interpreter
} // namespace internal
} // namespace v8
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