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// Copyright 2017 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/snapshot/builtin-deserializer.h"
#include "src/assembler-inl.h"
#include "src/interpreter/interpreter.h"
#include "src/objects-inl.h"
#include "src/snapshot/snapshot.h"
namespace v8 {
namespace internal {
using interpreter::Bytecodes;
using interpreter::Interpreter;
// Tracks the code object currently being deserialized (required for
// allocation).
class DeserializingCodeObjectScope {
public:
DeserializingCodeObjectScope(BuiltinDeserializer* builtin_deserializer,
int code_object_id)
: builtin_deserializer_(builtin_deserializer) {
DCHECK_EQ(BuiltinDeserializer::kNoCodeObjectId,
builtin_deserializer->current_code_object_id_);
builtin_deserializer->current_code_object_id_ = code_object_id;
}
~DeserializingCodeObjectScope() {
builtin_deserializer_->current_code_object_id_ =
BuiltinDeserializer::kNoCodeObjectId;
}
private:
BuiltinDeserializer* builtin_deserializer_;
DISALLOW_COPY_AND_ASSIGN(DeserializingCodeObjectScope)
};
BuiltinDeserializer::BuiltinDeserializer(Isolate* isolate,
const BuiltinSnapshotData* data)
: Deserializer(data, false) {
code_offsets_ = data->BuiltinOffsets();
DCHECK_EQ(Builtins::builtin_count, code_offsets_.length());
DCHECK(std::is_sorted(code_offsets_.begin(), code_offsets_.end()));
Initialize(isolate);
}
void BuiltinDeserializer::DeserializeEagerBuiltins() {
DCHECK(!AllowHeapAllocation::IsAllowed());
DCHECK_EQ(0, source()->position());
// Deserialize builtins.
Builtins* builtins = isolate()->builtins();
for (int i = 0; i < Builtins::builtin_count; i++) {
if (IsLazyDeserializationEnabled() && Builtins::IsLazy(i)) {
// Do nothing. These builtins have been replaced by DeserializeLazy in
// InitializeFromReservations.
DCHECK_EQ(builtins->builtin(builtins->LazyDeserializerForBuiltin(i)),
builtins->builtin(i));
} else {
builtins->set_builtin(i, DeserializeBuiltinRaw(i));
}
}
#ifdef DEBUG
for (int i = 0; i < Builtins::builtin_count; i++) {
Object* o = builtins->builtin(i);
DCHECK(o->IsCode() && Code::cast(o)->is_builtin());
}
#endif
#ifdef ENABLE_DISASSEMBLER
if (FLAG_print_builtin_code) {
// We can't print builtins during deserialization because they may refer
// to not yet deserialized builtins.
for (int i = 0; i < Builtins::builtin_count; i++) {
if (!IsLazyDeserializationEnabled() || !Builtins::IsLazy(i)) {
Code* code = builtins->builtin(i);
const char* name = Builtins::name(i);
code->PrintBuiltinCode(isolate(), name);
}
}
}
#endif
}
Code* BuiltinDeserializer::DeserializeBuiltin(int builtin_id) {
allocator()->ReserveAndInitializeBuiltinsTableForBuiltin(builtin_id);
DisallowHeapAllocation no_gc;
Code* code = DeserializeBuiltinRaw(builtin_id);
#ifdef ENABLE_DISASSEMBLER
if (FLAG_print_builtin_code) {
const char* name = Builtins::name(builtin_id);
code->PrintBuiltinCode(isolate(), name);
}
#endif // ENABLE_DISASSEMBLER
return code;
}
Code* BuiltinDeserializer::DeserializeBuiltinRaw(int builtin_id) {
DCHECK(!AllowHeapAllocation::IsAllowed());
DCHECK(Builtins::IsBuiltinId(builtin_id));
DeserializingCodeObjectScope scope(this, builtin_id);
const int initial_position = source()->position();
source()->set_position(code_offsets_[builtin_id]);
Object* o = ReadDataSingle();
DCHECK(o->IsCode() && Code::cast(o)->is_builtin());
// Rewind.
source()->set_position(initial_position);
// Flush the instruction cache.
Code* code = Code::cast(o);
Assembler::FlushICache(code->raw_instruction_start(),
code->raw_instruction_size());
CodeEventListener::LogEventsAndTags code_tag;
switch (code->kind()) {
case AbstractCode::BUILTIN:
code_tag = CodeEventListener::BUILTIN_TAG;
break;
case AbstractCode::BYTECODE_HANDLER:
code_tag = CodeEventListener::BYTECODE_HANDLER_TAG;
break;
default:
UNREACHABLE();
}
PROFILE(isolate(), CodeCreateEvent(code_tag, AbstractCode::cast(code),
Builtins::name(builtin_id)));
LOG_CODE_EVENT(isolate(),
CodeLinePosInfoRecordEvent(
code->raw_instruction_start(),
ByteArray::cast(code->source_position_table())));
return code;
}
uint32_t BuiltinDeserializer::ExtractCodeObjectSize(int code_object_id) {
DCHECK_LT(code_object_id, Builtins::builtin_count);
const int initial_position = source()->position();
// Grab the size of the code object.
source()->set_position(code_offsets_[code_object_id]);
byte data = source()->Get();
USE(data);
DCHECK_EQ(kNewObject | kPlain | kStartOfObject | CODE_SPACE, data);
const uint32_t result = source()->GetInt() << kObjectAlignmentBits;
// Rewind.
source()->set_position(initial_position);
return result;
}
} // namespace internal
} // namespace v8
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