// 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/counters.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 { #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