Line data Source code
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/interpreter/bytecode-array-accessor.h"
6 :
7 : #include "src/feedback-vector.h"
8 : #include "src/interpreter/bytecode-decoder.h"
9 : #include "src/interpreter/interpreter-intrinsics.h"
10 : #include "src/objects-inl.h"
11 : #include "src/objects/code-inl.h"
12 :
13 : namespace v8 {
14 : namespace internal {
15 : namespace interpreter {
16 :
17 4882844 : BytecodeArrayAccessor::BytecodeArrayAccessor(
18 : Handle<BytecodeArray> bytecode_array, int initial_offset)
19 : : bytecode_array_(bytecode_array),
20 : bytecode_offset_(initial_offset),
21 : operand_scale_(OperandScale::kSingle),
22 4882844 : prefix_offset_(0) {
23 4882844 : UpdateOperandScale();
24 4882846 : }
25 :
26 48790042 : void BytecodeArrayAccessor::SetOffset(int offset) {
27 48790042 : bytecode_offset_ = offset;
28 48790042 : UpdateOperandScale();
29 48790062 : }
30 :
31 3807422 : void BytecodeArrayAccessor::ApplyDebugBreak() {
32 : // Get the raw bytecode from the bytecode array. This may give us a
33 : // scaling prefix, which we can patch with the matching debug-break
34 : // variant.
35 : interpreter::Bytecode bytecode =
36 3807422 : interpreter::Bytecodes::FromByte(bytecode_array_->get(bytecode_offset_));
37 3807422 : if (interpreter::Bytecodes::IsDebugBreak(bytecode)) return;
38 : interpreter::Bytecode debugbreak =
39 3776517 : interpreter::Bytecodes::GetDebugBreak(bytecode);
40 3776517 : bytecode_array_->set(bytecode_offset_,
41 : interpreter::Bytecodes::ToByte(debugbreak));
42 : }
43 :
44 53672820 : void BytecodeArrayAccessor::UpdateOperandScale() {
45 53672820 : if (OffsetInBounds()) {
46 : uint8_t current_byte = bytecode_array()->get(bytecode_offset_);
47 : Bytecode current_bytecode = Bytecodes::FromByte(current_byte);
48 52590913 : if (Bytecodes::IsPrefixScalingBytecode(current_bytecode)) {
49 : operand_scale_ =
50 2961917 : Bytecodes::PrefixBytecodeToOperandScale(current_bytecode);
51 2961917 : prefix_offset_ = 1;
52 : } else {
53 49628996 : operand_scale_ = OperandScale::kSingle;
54 49628996 : prefix_offset_ = 0;
55 : }
56 : }
57 53672820 : }
58 :
59 0 : bool BytecodeArrayAccessor::OffsetInBounds() const {
60 107345656 : return bytecode_offset_ >= 0 && bytecode_offset_ < bytecode_array()->length();
61 : }
62 :
63 45894180 : Bytecode BytecodeArrayAccessor::current_bytecode() const {
64 : DCHECK(OffsetInBounds());
65 : uint8_t current_byte =
66 117096520 : bytecode_array()->get(bytecode_offset_ + current_prefix_offset());
67 : Bytecode current_bytecode = Bytecodes::FromByte(current_byte);
68 : DCHECK(!Bytecodes::IsPrefixScalingBytecode(current_bytecode));
69 45894180 : return current_bytecode;
70 : }
71 :
72 31067404 : int BytecodeArrayAccessor::current_bytecode_size() const {
73 : return current_prefix_offset() +
74 31067404 : Bytecodes::Size(current_bytecode(), current_operand_scale());
75 : }
76 :
77 10794350 : uint32_t BytecodeArrayAccessor::GetUnsignedOperand(
78 : int operand_index, OperandType operand_type) const {
79 : DCHECK_GE(operand_index, 0);
80 : DCHECK_LT(operand_index, Bytecodes::NumberOfOperands(current_bytecode()));
81 : DCHECK_EQ(operand_type,
82 : Bytecodes::GetOperandType(current_bytecode(), operand_index));
83 : DCHECK(Bytecodes::IsUnsignedOperandType(operand_type));
84 : Address operand_start =
85 10794350 : bytecode_array()->GetFirstBytecodeAddress() + bytecode_offset_ +
86 10794348 : current_prefix_offset() +
87 10794350 : Bytecodes::GetOperandOffset(current_bytecode(), operand_index,
88 10794348 : current_operand_scale());
89 : return BytecodeDecoder::DecodeUnsignedOperand(operand_start, operand_type,
90 10794348 : current_operand_scale());
91 : }
92 :
93 755336 : int32_t BytecodeArrayAccessor::GetSignedOperand(
94 : int operand_index, OperandType operand_type) const {
95 : DCHECK_GE(operand_index, 0);
96 : DCHECK_LT(operand_index, Bytecodes::NumberOfOperands(current_bytecode()));
97 : DCHECK_EQ(operand_type,
98 : Bytecodes::GetOperandType(current_bytecode(), operand_index));
99 : DCHECK(!Bytecodes::IsUnsignedOperandType(operand_type));
100 : Address operand_start =
101 755336 : bytecode_array()->GetFirstBytecodeAddress() + bytecode_offset_ +
102 755336 : current_prefix_offset() +
103 755336 : Bytecodes::GetOperandOffset(current_bytecode(), operand_index,
104 755336 : current_operand_scale());
105 : return BytecodeDecoder::DecodeSignedOperand(operand_start, operand_type,
106 755336 : current_operand_scale());
107 : }
108 :
109 540916 : uint32_t BytecodeArrayAccessor::GetFlagOperand(int operand_index) const {
110 : DCHECK_EQ(Bytecodes::GetOperandType(current_bytecode(), operand_index),
111 : OperandType::kFlag8);
112 540916 : return GetUnsignedOperand(operand_index, OperandType::kFlag8);
113 : }
114 :
115 141716 : uint32_t BytecodeArrayAccessor::GetUnsignedImmediateOperand(
116 : int operand_index) const {
117 : DCHECK_EQ(Bytecodes::GetOperandType(current_bytecode(), operand_index),
118 : OperandType::kUImm);
119 1724782 : return GetUnsignedOperand(operand_index, OperandType::kUImm);
120 : }
121 :
122 746600 : int32_t BytecodeArrayAccessor::GetImmediateOperand(int operand_index) const {
123 : DCHECK_EQ(Bytecodes::GetOperandType(current_bytecode(), operand_index),
124 : OperandType::kImm);
125 755336 : return GetSignedOperand(operand_index, OperandType::kImm);
126 : }
127 :
128 963486 : uint32_t BytecodeArrayAccessor::GetRegisterCountOperand(
129 : int operand_index) const {
130 : DCHECK_EQ(Bytecodes::GetOperandType(current_bytecode(), operand_index),
131 : OperandType::kRegCount);
132 963490 : return GetUnsignedOperand(operand_index, OperandType::kRegCount);
133 : }
134 :
135 7378435 : uint32_t BytecodeArrayAccessor::GetIndexOperand(int operand_index) const {
136 : OperandType operand_type =
137 : Bytecodes::GetOperandType(current_bytecode(), operand_index);
138 : DCHECK_EQ(operand_type, OperandType::kIdx);
139 7378435 : return GetUnsignedOperand(operand_index, operand_type);
140 : }
141 :
142 1251035 : FeedbackSlot BytecodeArrayAccessor::GetSlotOperand(int operand_index) const {
143 1251035 : int index = GetIndexOperand(operand_index);
144 1251035 : return FeedbackVector::ToSlot(index);
145 : }
146 :
147 19417918 : Register BytecodeArrayAccessor::GetRegisterOperand(int operand_index) const {
148 : OperandType operand_type =
149 : Bytecodes::GetOperandType(current_bytecode(), operand_index);
150 : Address operand_start =
151 19417918 : bytecode_array()->GetFirstBytecodeAddress() + bytecode_offset_ +
152 19417901 : current_prefix_offset() +
153 19417918 : Bytecodes::GetOperandOffset(current_bytecode(), operand_index,
154 19417901 : current_operand_scale());
155 : return BytecodeDecoder::DecodeRegisterOperand(operand_start, operand_type,
156 19417901 : current_operand_scale());
157 : }
158 :
159 40 : int BytecodeArrayAccessor::GetRegisterOperandRange(int operand_index) const {
160 : DCHECK_LE(operand_index, Bytecodes::NumberOfOperands(current_bytecode()));
161 : const OperandType* operand_types =
162 : Bytecodes::GetOperandTypes(current_bytecode());
163 40 : OperandType operand_type = operand_types[operand_index];
164 : DCHECK(Bytecodes::IsRegisterOperandType(operand_type));
165 80 : if (operand_type == OperandType::kRegList ||
166 40 : operand_type == OperandType::kRegOutList) {
167 8 : return GetRegisterCountOperand(operand_index + 1);
168 : } else {
169 36 : return Bytecodes::GetNumberOfRegistersRepresentedBy(operand_type);
170 : }
171 : }
172 :
173 168574 : Runtime::FunctionId BytecodeArrayAccessor::GetRuntimeIdOperand(
174 : int operand_index) const {
175 : OperandType operand_type =
176 : Bytecodes::GetOperandType(current_bytecode(), operand_index);
177 : DCHECK_EQ(operand_type, OperandType::kRuntimeId);
178 168574 : uint32_t raw_id = GetUnsignedOperand(operand_index, operand_type);
179 168574 : return static_cast<Runtime::FunctionId>(raw_id);
180 : }
181 :
182 192 : uint32_t BytecodeArrayAccessor::GetNativeContextIndexOperand(
183 : int operand_index) const {
184 : OperandType operand_type =
185 : Bytecodes::GetOperandType(current_bytecode(), operand_index);
186 : DCHECK_EQ(operand_type, OperandType::kNativeContextIndex);
187 192 : return GetUnsignedOperand(operand_index, operand_type);
188 : }
189 :
190 17991 : Runtime::FunctionId BytecodeArrayAccessor::GetIntrinsicIdOperand(
191 : int operand_index) const {
192 : OperandType operand_type =
193 : Bytecodes::GetOperandType(current_bytecode(), operand_index);
194 : DCHECK_EQ(operand_type, OperandType::kIntrinsicId);
195 17991 : uint32_t raw_id = GetUnsignedOperand(operand_index, operand_type);
196 17991 : return IntrinsicsHelper::ToRuntimeId(
197 17991 : static_cast<IntrinsicsHelper::IntrinsicId>(raw_id));
198 : }
199 :
200 2879213 : Object BytecodeArrayAccessor::GetConstantAtIndex(int index) const {
201 2879213 : return bytecode_array()->constant_pool()->get(index);
202 : }
203 :
204 2820412 : Object BytecodeArrayAccessor::GetConstantForIndexOperand(
205 : int operand_index) const {
206 2839446 : return GetConstantAtIndex(GetIndexOperand(operand_index));
207 : }
208 :
209 1588916 : int BytecodeArrayAccessor::GetJumpTargetOffset() const {
210 : Bytecode bytecode = current_bytecode();
211 1588916 : if (interpreter::Bytecodes::IsJumpImmediate(bytecode)) {
212 1569883 : int relative_offset = GetUnsignedImmediateOperand(0);
213 1569883 : if (bytecode == Bytecode::kJumpLoop) {
214 156688 : relative_offset = -relative_offset;
215 : }
216 1569883 : return GetAbsoluteOffset(relative_offset);
217 19034 : } else if (interpreter::Bytecodes::IsJumpConstant(bytecode)) {
218 : Smi smi = Smi::cast(GetConstantForIndexOperand(0));
219 : return GetAbsoluteOffset(smi->value());
220 : } else {
221 0 : UNREACHABLE();
222 : }
223 : }
224 :
225 13184 : JumpTableTargetOffsets BytecodeArrayAccessor::GetJumpTableTargetOffsets()
226 : const {
227 : uint32_t table_start, table_size;
228 : int32_t case_value_base;
229 13184 : if (current_bytecode() == Bytecode::kSwitchOnGeneratorState) {
230 4448 : table_start = GetIndexOperand(1);
231 : table_size = GetUnsignedImmediateOperand(2);
232 : case_value_base = 0;
233 : } else {
234 : DCHECK_EQ(current_bytecode(), Bytecode::kSwitchOnSmiNoFeedback);
235 8736 : table_start = GetIndexOperand(0);
236 : table_size = GetUnsignedImmediateOperand(1);
237 : case_value_base = GetImmediateOperand(2);
238 : }
239 26368 : return JumpTableTargetOffsets(this, table_start, table_size, case_value_base);
240 : }
241 :
242 0 : int BytecodeArrayAccessor::GetAbsoluteOffset(int relative_offset) const {
243 1619970 : return current_offset() + relative_offset + current_prefix_offset();
244 : }
245 :
246 0 : bool BytecodeArrayAccessor::OffsetWithinBytecode(int offset) const {
247 0 : return current_offset() <= offset &&
248 0 : offset < current_offset() + current_bytecode_size();
249 : }
250 :
251 62 : std::ostream& BytecodeArrayAccessor::PrintTo(std::ostream& os) const {
252 : const uint8_t* bytecode_addr = reinterpret_cast<const uint8_t*>(
253 62 : bytecode_array()->GetFirstBytecodeAddress() + bytecode_offset_);
254 : return BytecodeDecoder::Decode(os, bytecode_addr,
255 62 : bytecode_array()->parameter_count());
256 : }
257 :
258 0 : JumpTableTargetOffsets::JumpTableTargetOffsets(
259 : const BytecodeArrayAccessor* accessor, int table_start, int table_size,
260 : int case_value_base)
261 : : accessor_(accessor),
262 : table_start_(table_start),
263 : table_size_(table_size),
264 13184 : case_value_base_(case_value_base) {}
265 :
266 13184 : JumpTableTargetOffsets::iterator JumpTableTargetOffsets::begin() const {
267 34598 : return iterator(case_value_base_, table_start_, table_start_ + table_size_,
268 47782 : accessor_);
269 : }
270 13184 : JumpTableTargetOffsets::iterator JumpTableTargetOffsets::end() const {
271 17299 : return iterator(case_value_base_ + table_size_, table_start_ + table_size_,
272 47782 : table_start_ + table_size_, accessor_);
273 : }
274 4115 : int JumpTableTargetOffsets::size() const {
275 : int ret = 0;
276 : // TODO(leszeks): Is there a more efficient way of doing this than iterating?
277 12534 : for (const auto& entry : *this) {
278 : USE(entry);
279 8419 : ret++;
280 : }
281 4115 : return ret;
282 : }
283 :
284 0 : JumpTableTargetOffsets::iterator::iterator(
285 : int case_value, int table_offset, int table_end,
286 : const BytecodeArrayAccessor* accessor)
287 : : accessor_(accessor),
288 : current_(Smi::zero()),
289 : index_(case_value),
290 : table_offset_(table_offset),
291 34598 : table_end_(table_end) {
292 34598 : UpdateAndAdvanceToValid();
293 0 : }
294 :
295 31053 : JumpTableTargetOffset JumpTableTargetOffsets::iterator::operator*() {
296 : DCHECK_LT(table_offset_, table_end_);
297 93159 : return {index_, accessor_->GetAbsoluteOffset(Smi::ToInt(current_))};
298 : }
299 :
300 31053 : JumpTableTargetOffsets::iterator& JumpTableTargetOffsets::iterator::
301 : operator++() {
302 : DCHECK_LT(table_offset_, table_end_);
303 39472 : ++table_offset_;
304 39472 : ++index_;
305 39472 : UpdateAndAdvanceToValid();
306 31053 : return *this;
307 : }
308 :
309 44237 : bool JumpTableTargetOffsets::iterator::operator!=(
310 : const JumpTableTargetOffsets::iterator& other) {
311 : DCHECK_EQ(accessor_, other.accessor_);
312 : DCHECK_EQ(table_end_, other.table_end_);
313 : DCHECK_EQ(index_ - other.index_, table_offset_ - other.table_offset_);
314 56771 : return index_ != other.index_;
315 : }
316 :
317 74070 : void JumpTableTargetOffsets::iterator::UpdateAndAdvanceToValid() {
318 74070 : if (table_offset_ >= table_end_) return;
319 :
320 39748 : Object current = accessor_->GetConstantAtIndex(table_offset_);
321 39780 : while (!current->IsSmi()) {
322 : DCHECK(current->IsTheHole());
323 292 : ++table_offset_;
324 292 : ++index_;
325 292 : if (table_offset_ >= table_end_) break;
326 16 : current = accessor_->GetConstantAtIndex(table_offset_);
327 : }
328 : // Make sure we haven't reached the end of the table with a hole in current.
329 39748 : if (current->IsSmi()) {
330 39472 : current_ = Smi::cast(current);
331 : }
332 : }
333 :
334 : } // namespace interpreter
335 : } // namespace internal
336 122004 : } // namespace v8
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