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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 <iomanip>
#include "src/arguments-inl.h"
#include "src/frames-inl.h"
#include "src/interpreter/bytecode-array-iterator.h"
#include "src/interpreter/bytecode-decoder.h"
#include "src/interpreter/bytecode-flags.h"
#include "src/interpreter/bytecode-register.h"
#include "src/interpreter/bytecodes.h"
#include "src/interpreter/interpreter.h"
#include "src/isolate-inl.h"
#include "src/ostreams.h"
#include "src/runtime/runtime-utils.h"
#include "src/snapshot/snapshot.h"
namespace v8 {
namespace internal {
RUNTIME_FUNCTION(Runtime_InterpreterDeserializeLazy) {
HandleScope scope(isolate);
DCHECK(FLAG_lazy_handler_deserialization);
DCHECK(FLAG_lazy_deserialization);
DCHECK_EQ(2, args.length());
CONVERT_SMI_ARG_CHECKED(bytecode_int, 0);
CONVERT_SMI_ARG_CHECKED(operand_scale_int, 1);
using interpreter::Bytecode;
using interpreter::Bytecodes;
using interpreter::OperandScale;
Bytecode bytecode = Bytecodes::FromByte(bytecode_int);
OperandScale operand_scale = static_cast<OperandScale>(operand_scale_int);
return isolate->interpreter()->GetAndMaybeDeserializeBytecodeHandler(
bytecode, operand_scale);
}
#ifdef V8_TRACE_IGNITION
namespace {
void AdvanceToOffsetForTracing(
interpreter::BytecodeArrayIterator& bytecode_iterator, int offset) {
while (bytecode_iterator.current_offset() +
bytecode_iterator.current_bytecode_size() <=
offset) {
bytecode_iterator.Advance();
}
DCHECK(bytecode_iterator.current_offset() == offset ||
((bytecode_iterator.current_offset() + 1) == offset &&
bytecode_iterator.current_operand_scale() >
interpreter::OperandScale::kSingle));
}
void PrintRegisters(Isolate* isolate, std::ostream& os, bool is_input,
interpreter::BytecodeArrayIterator& bytecode_iterator,
Handle<Object> accumulator) {
static const char kAccumulator[] = "accumulator";
static const int kRegFieldWidth = static_cast<int>(sizeof(kAccumulator) - 1);
static const char* kInputColourCode = "\033[0;36m";
static const char* kOutputColourCode = "\033[0;35m";
static const char* kNormalColourCode = "\033[0;m";
const char* kArrowDirection = is_input ? " -> " : " <- ";
if (FLAG_log_colour) {
os << (is_input ? kInputColourCode : kOutputColourCode);
}
interpreter::Bytecode bytecode = bytecode_iterator.current_bytecode();
// Print accumulator.
if ((is_input && interpreter::Bytecodes::ReadsAccumulator(bytecode)) ||
(!is_input && interpreter::Bytecodes::WritesAccumulator(bytecode))) {
os << " [ " << kAccumulator << kArrowDirection;
accumulator->ShortPrint();
os << " ]" << std::endl;
}
// Print the registers.
JavaScriptFrameIterator frame_iterator(isolate);
InterpretedFrame* frame =
reinterpret_cast<InterpretedFrame*>(frame_iterator.frame());
int operand_count = interpreter::Bytecodes::NumberOfOperands(bytecode);
for (int operand_index = 0; operand_index < operand_count; operand_index++) {
interpreter::OperandType operand_type =
interpreter::Bytecodes::GetOperandType(bytecode, operand_index);
bool should_print =
is_input
? interpreter::Bytecodes::IsRegisterInputOperandType(operand_type)
: interpreter::Bytecodes::IsRegisterOutputOperandType(operand_type);
if (should_print) {
interpreter::Register first_reg =
bytecode_iterator.GetRegisterOperand(operand_index);
int range = bytecode_iterator.GetRegisterOperandRange(operand_index);
for (int reg_index = first_reg.index();
reg_index < first_reg.index() + range; reg_index++) {
Object* reg_object = frame->ReadInterpreterRegister(reg_index);
os << " [ " << std::setw(kRegFieldWidth)
<< interpreter::Register(reg_index).ToString(
bytecode_iterator.bytecode_array()->parameter_count())
<< kArrowDirection;
reg_object->ShortPrint(os);
os << " ]" << std::endl;
}
}
}
if (FLAG_log_colour) {
os << kNormalColourCode;
}
}
} // namespace
RUNTIME_FUNCTION(Runtime_InterpreterTraceBytecodeEntry) {
if (!FLAG_trace_ignition) {
return ReadOnlyRoots(isolate).undefined_value();
}
SealHandleScope shs(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(BytecodeArray, bytecode_array, 0);
CONVERT_SMI_ARG_CHECKED(bytecode_offset, 1);
CONVERT_ARG_HANDLE_CHECKED(Object, accumulator, 2);
int offset = bytecode_offset - BytecodeArray::kHeaderSize + kHeapObjectTag;
interpreter::BytecodeArrayIterator bytecode_iterator(bytecode_array);
AdvanceToOffsetForTracing(bytecode_iterator, offset);
if (offset == bytecode_iterator.current_offset()) {
StdoutStream os;
// Print bytecode.
const uint8_t* base_address = reinterpret_cast<const uint8_t*>(
bytecode_array->GetFirstBytecodeAddress());
const uint8_t* bytecode_address = base_address + offset;
os << " -> " << static_cast<const void*>(bytecode_address) << " @ "
<< std::setw(4) << offset << " : ";
interpreter::BytecodeDecoder::Decode(os, bytecode_address,
bytecode_array->parameter_count());
os << std::endl;
// Print all input registers and accumulator.
PrintRegisters(isolate, os, true, bytecode_iterator, accumulator);
os << std::flush;
}
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_InterpreterTraceBytecodeExit) {
if (!FLAG_trace_ignition) {
return ReadOnlyRoots(isolate).undefined_value();
}
SealHandleScope shs(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(BytecodeArray, bytecode_array, 0);
CONVERT_SMI_ARG_CHECKED(bytecode_offset, 1);
CONVERT_ARG_HANDLE_CHECKED(Object, accumulator, 2);
int offset = bytecode_offset - BytecodeArray::kHeaderSize + kHeapObjectTag;
interpreter::BytecodeArrayIterator bytecode_iterator(bytecode_array);
AdvanceToOffsetForTracing(bytecode_iterator, offset);
// The offset comparison here ensures registers only printed when the
// (potentially) widened bytecode has completed. The iterator reports
// the offset as the offset of the prefix bytecode.
if (bytecode_iterator.current_operand_scale() ==
interpreter::OperandScale::kSingle ||
offset > bytecode_iterator.current_offset()) {
StdoutStream os;
// Print all output registers and accumulator.
PrintRegisters(isolate, os, false, bytecode_iterator, accumulator);
os << std::flush;
}
return ReadOnlyRoots(isolate).undefined_value();
}
#endif
#ifdef V8_TRACE_FEEDBACK_UPDATES
RUNTIME_FUNCTION(Runtime_InterpreterTraceUpdateFeedback) {
if (!FLAG_trace_feedback_updates) {
return ReadOnlyRoots(isolate).undefined_value();
}
SealHandleScope shs(isolate);
DCHECK_EQ(3, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
CONVERT_SMI_ARG_CHECKED(slot, 1);
CONVERT_ARG_CHECKED(String, reason, 2);
int slot_count = function->feedback_vector()->metadata()->slot_count();
StdoutStream os;
os << "[Feedback slot " << slot << "/" << slot_count << " in ";
function->shared()->ShortPrint(os);
os << " updated to ";
function->feedback_vector()->FeedbackSlotPrint(os, FeedbackSlot(slot));
os << " - ";
StringCharacterStream stream(reason);
while (stream.HasMore()) {
uint16_t character = stream.GetNext();
PrintF("%c", character);
}
os << "]" << std::endl;
return ReadOnlyRoots(isolate).undefined_value();
}
#endif
} // namespace internal
} // namespace v8
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