1 // Copyright 2015 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/runtime/runtime-utils.h"
6
7 #include <iomanip>
8
9 #include "src/arguments.h"
10 #include "src/frames-inl.h"
11 #include "src/interpreter/bytecode-array-iterator.h"
12 #include "src/interpreter/bytecode-decoder.h"
13 #include "src/interpreter/bytecode-flags.h"
14 #include "src/interpreter/bytecode-register.h"
15 #include "src/interpreter/bytecodes.h"
16 #include "src/isolate-inl.h"
17 #include "src/ostreams.h"
18
19 namespace v8 {
20 namespace internal {
21
RUNTIME_FUNCTION(Runtime_InterpreterNewClosure)22 RUNTIME_FUNCTION(Runtime_InterpreterNewClosure) {
23 HandleScope scope(isolate);
24 DCHECK_EQ(4, args.length());
25 CONVERT_ARG_HANDLE_CHECKED(SharedFunctionInfo, shared, 0);
26 CONVERT_ARG_HANDLE_CHECKED(FeedbackVector, vector, 1);
27 CONVERT_SMI_ARG_CHECKED(index, 2);
28 CONVERT_SMI_ARG_CHECKED(pretenured_flag, 3);
29 Handle<Context> context(isolate->context(), isolate);
30 FeedbackSlot slot = FeedbackVector::ToSlot(index);
31 Handle<Cell> vector_cell(Cell::cast(vector->Get(slot)), isolate);
32 return *isolate->factory()->NewFunctionFromSharedFunctionInfo(
33 shared, context, vector_cell,
34 static_cast<PretenureFlag>(pretenured_flag));
35 }
36
37 namespace {
38
AdvanceToOffsetForTracing(interpreter::BytecodeArrayIterator & bytecode_iterator,int offset)39 void AdvanceToOffsetForTracing(
40 interpreter::BytecodeArrayIterator& bytecode_iterator, int offset) {
41 while (bytecode_iterator.current_offset() +
42 bytecode_iterator.current_bytecode_size() <=
43 offset) {
44 bytecode_iterator.Advance();
45 }
46 DCHECK(bytecode_iterator.current_offset() == offset ||
47 ((bytecode_iterator.current_offset() + 1) == offset &&
48 bytecode_iterator.current_operand_scale() >
49 interpreter::OperandScale::kSingle));
50 }
51
PrintRegisters(std::ostream & os,bool is_input,interpreter::BytecodeArrayIterator & bytecode_iterator,Handle<Object> accumulator)52 void PrintRegisters(std::ostream& os, bool is_input,
53 interpreter::BytecodeArrayIterator& bytecode_iterator,
54 Handle<Object> accumulator) {
55 static const char kAccumulator[] = "accumulator";
56 static const int kRegFieldWidth = static_cast<int>(sizeof(kAccumulator) - 1);
57 static const char* kInputColourCode = "\033[0;36m";
58 static const char* kOutputColourCode = "\033[0;35m";
59 static const char* kNormalColourCode = "\033[0;m";
60 const char* kArrowDirection = is_input ? " -> " : " <- ";
61 if (FLAG_log_colour) {
62 os << (is_input ? kInputColourCode : kOutputColourCode);
63 }
64
65 interpreter::Bytecode bytecode = bytecode_iterator.current_bytecode();
66
67 // Print accumulator.
68 if ((is_input && interpreter::Bytecodes::ReadsAccumulator(bytecode)) ||
69 (!is_input && interpreter::Bytecodes::WritesAccumulator(bytecode))) {
70 os << " [ " << kAccumulator << kArrowDirection;
71 accumulator->ShortPrint();
72 os << " ]" << std::endl;
73 }
74
75 // Print the registers.
76 JavaScriptFrameIterator frame_iterator(
77 bytecode_iterator.bytecode_array()->GetIsolate());
78 InterpretedFrame* frame =
79 reinterpret_cast<InterpretedFrame*>(frame_iterator.frame());
80 int operand_count = interpreter::Bytecodes::NumberOfOperands(bytecode);
81 for (int operand_index = 0; operand_index < operand_count; operand_index++) {
82 interpreter::OperandType operand_type =
83 interpreter::Bytecodes::GetOperandType(bytecode, operand_index);
84 bool should_print =
85 is_input
86 ? interpreter::Bytecodes::IsRegisterInputOperandType(operand_type)
87 : interpreter::Bytecodes::IsRegisterOutputOperandType(operand_type);
88 if (should_print) {
89 interpreter::Register first_reg =
90 bytecode_iterator.GetRegisterOperand(operand_index);
91 int range = bytecode_iterator.GetRegisterOperandRange(operand_index);
92 for (int reg_index = first_reg.index();
93 reg_index < first_reg.index() + range; reg_index++) {
94 Object* reg_object = frame->ReadInterpreterRegister(reg_index);
95 os << " [ " << std::setw(kRegFieldWidth)
96 << interpreter::Register(reg_index).ToString(
97 bytecode_iterator.bytecode_array()->parameter_count())
98 << kArrowDirection;
99 reg_object->ShortPrint(os);
100 os << " ]" << std::endl;
101 }
102 }
103 }
104 if (FLAG_log_colour) {
105 os << kNormalColourCode;
106 }
107 }
108
109 } // namespace
110
RUNTIME_FUNCTION(Runtime_InterpreterTraceBytecodeEntry)111 RUNTIME_FUNCTION(Runtime_InterpreterTraceBytecodeEntry) {
112 SealHandleScope shs(isolate);
113 DCHECK_EQ(3, args.length());
114 CONVERT_ARG_HANDLE_CHECKED(BytecodeArray, bytecode_array, 0);
115 CONVERT_SMI_ARG_CHECKED(bytecode_offset, 1);
116 CONVERT_ARG_HANDLE_CHECKED(Object, accumulator, 2);
117 OFStream os(stdout);
118
119 int offset = bytecode_offset - BytecodeArray::kHeaderSize + kHeapObjectTag;
120 interpreter::BytecodeArrayIterator bytecode_iterator(bytecode_array);
121 AdvanceToOffsetForTracing(bytecode_iterator, offset);
122 if (offset == bytecode_iterator.current_offset()) {
123 // Print bytecode.
124 const uint8_t* base_address = bytecode_array->GetFirstBytecodeAddress();
125 const uint8_t* bytecode_address = base_address + offset;
126 os << " -> " << static_cast<const void*>(bytecode_address) << " @ "
127 << std::setw(4) << offset << " : ";
128 interpreter::BytecodeDecoder::Decode(os, bytecode_address,
129 bytecode_array->parameter_count());
130 os << std::endl;
131 // Print all input registers and accumulator.
132 PrintRegisters(os, true, bytecode_iterator, accumulator);
133
134 os << std::flush;
135 }
136 return isolate->heap()->undefined_value();
137 }
138
RUNTIME_FUNCTION(Runtime_InterpreterTraceBytecodeExit)139 RUNTIME_FUNCTION(Runtime_InterpreterTraceBytecodeExit) {
140 SealHandleScope shs(isolate);
141 DCHECK_EQ(3, args.length());
142 CONVERT_ARG_HANDLE_CHECKED(BytecodeArray, bytecode_array, 0);
143 CONVERT_SMI_ARG_CHECKED(bytecode_offset, 1);
144 CONVERT_ARG_HANDLE_CHECKED(Object, accumulator, 2);
145
146 int offset = bytecode_offset - BytecodeArray::kHeaderSize + kHeapObjectTag;
147 interpreter::BytecodeArrayIterator bytecode_iterator(bytecode_array);
148 AdvanceToOffsetForTracing(bytecode_iterator, offset);
149 // The offset comparison here ensures registers only printed when the
150 // (potentially) widened bytecode has completed. The iterator reports
151 // the offset as the offset of the prefix bytecode.
152 if (bytecode_iterator.current_operand_scale() ==
153 interpreter::OperandScale::kSingle ||
154 offset > bytecode_iterator.current_offset()) {
155 OFStream os(stdout);
156 // Print all output registers and accumulator.
157 PrintRegisters(os, false, bytecode_iterator, accumulator);
158 os << std::flush;
159 }
160 return isolate->heap()->undefined_value();
161 }
162
RUNTIME_FUNCTION(Runtime_InterpreterAdvanceBytecodeOffset)163 RUNTIME_FUNCTION(Runtime_InterpreterAdvanceBytecodeOffset) {
164 SealHandleScope shs(isolate);
165 DCHECK_EQ(2, args.length());
166 CONVERT_ARG_HANDLE_CHECKED(BytecodeArray, bytecode_array, 0);
167 CONVERT_SMI_ARG_CHECKED(bytecode_offset, 1);
168 interpreter::BytecodeArrayIterator it(bytecode_array);
169 int offset = bytecode_offset - BytecodeArray::kHeaderSize + kHeapObjectTag;
170 while (it.current_offset() < offset) it.Advance();
171 DCHECK_EQ(offset, it.current_offset());
172 it.Advance(); // Advance by one bytecode.
173 offset = it.current_offset() + BytecodeArray::kHeaderSize - kHeapObjectTag;
174 return Smi::FromInt(offset);
175 }
176
177 } // namespace internal
178 } // namespace v8
179