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 4880325 : 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 4880325 : prefix_offset_(0) {
23 4880325 : UpdateOperandScale();
24 4880340 : }
25 :
26 50584652 : void BytecodeArrayAccessor::SetOffset(int offset) {
27 50584652 : bytecode_offset_ = offset;
28 50584652 : UpdateOperandScale();
29 50584694 : }
30 :
31 3807404 : 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 3807404 : interpreter::Bytecodes::FromByte(bytecode_array_->get(bytecode_offset_));
37 3807404 : if (interpreter::Bytecodes::IsDebugBreak(bytecode)) return;
38 : interpreter::Bytecode debugbreak =
39 3776499 : interpreter::Bytecodes::GetDebugBreak(bytecode);
40 3776499 : bytecode_array_->set(bytecode_offset_,
41 : interpreter::Bytecodes::ToByte(debugbreak));
42 : }
43 :
44 55464952 : void BytecodeArrayAccessor::UpdateOperandScale() {
45 55464952 : if (OffsetInBounds()) {
46 : uint8_t current_byte = bytecode_array()->get(bytecode_offset_);
47 : Bytecode current_bytecode = Bytecodes::FromByte(current_byte);
48 54385512 : if (Bytecodes::IsPrefixScalingBytecode(current_bytecode)) {
49 : operand_scale_ =
50 3997104 : Bytecodes::PrefixBytecodeToOperandScale(current_bytecode);
51 3997104 : prefix_offset_ = 1;
52 : } else {
53 50388408 : operand_scale_ = OperandScale::kSingle;
54 50388408 : prefix_offset_ = 0;
55 : }
56 : }
57 55464952 : }
58 :
59 0 : bool BytecodeArrayAccessor::OffsetInBounds() const {
60 110929923 : return bytecode_offset_ >= 0 && bytecode_offset_ < bytecode_array()->length();
61 : }
62 :
63 47684610 : Bytecode BytecodeArrayAccessor::current_bytecode() const {
64 : DCHECK(OffsetInBounds());
65 : uint8_t current_byte =
66 121691818 : bytecode_array()->get(bytecode_offset_ + current_prefix_offset());
67 : Bytecode current_bytecode = Bytecodes::FromByte(current_byte);
68 : DCHECK(!Bytecodes::IsPrefixScalingBytecode(current_bytecode));
69 47684610 : return current_bytecode;
70 : }
71 :
72 32274424 : int BytecodeArrayAccessor::current_bytecode_size() const {
73 : return current_prefix_offset() +
74 32274424 : Bytecodes::Size(current_bytecode(), current_operand_scale());
75 : }
76 :
77 11340260 : 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 11340260 : bytecode_array()->GetFirstBytecodeAddress() + bytecode_offset_ +
86 11340254 : current_prefix_offset() +
87 11340260 : Bytecodes::GetOperandOffset(current_bytecode(), operand_index,
88 11340254 : current_operand_scale());
89 : return BytecodeDecoder::DecodeUnsignedOperand(operand_start, operand_type,
90 11340254 : current_operand_scale());
91 : }
92 :
93 906469 : 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 906469 : bytecode_array()->GetFirstBytecodeAddress() + bytecode_offset_ +
102 906467 : current_prefix_offset() +
103 906469 : Bytecodes::GetOperandOffset(current_bytecode(), operand_index,
104 906467 : current_operand_scale());
105 : return BytecodeDecoder::DecodeSignedOperand(operand_start, operand_type,
106 906467 : current_operand_scale());
107 : }
108 :
109 544255 : uint32_t BytecodeArrayAccessor::GetFlagOperand(int operand_index) const {
110 : DCHECK_EQ(Bytecodes::GetOperandType(current_bytecode(), operand_index),
111 : OperandType::kFlag8);
112 544255 : return GetUnsignedOperand(operand_index, OperandType::kFlag8);
113 : }
114 :
115 142562 : uint32_t BytecodeArrayAccessor::GetUnsignedImmediateOperand(
116 : int operand_index) const {
117 : DCHECK_EQ(Bytecodes::GetOperandType(current_bytecode(), operand_index),
118 : OperandType::kUImm);
119 1714128 : return GetUnsignedOperand(operand_index, OperandType::kUImm);
120 : }
121 :
122 896022 : int32_t BytecodeArrayAccessor::GetImmediateOperand(int operand_index) const {
123 : DCHECK_EQ(Bytecodes::GetOperandType(current_bytecode(), operand_index),
124 : OperandType::kImm);
125 906468 : return GetSignedOperand(operand_index, OperandType::kImm);
126 : }
127 :
128 970889 : uint32_t BytecodeArrayAccessor::GetRegisterCountOperand(
129 : int operand_index) const {
130 : DCHECK_EQ(Bytecodes::GetOperandType(current_bytecode(), operand_index),
131 : OperandType::kRegCount);
132 970893 : return GetUnsignedOperand(operand_index, OperandType::kRegCount);
133 : }
134 :
135 7926579 : 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 7926579 : return GetUnsignedOperand(operand_index, operand_type);
140 : }
141 :
142 1268866 : FeedbackSlot BytecodeArrayAccessor::GetSlotOperand(int operand_index) const {
143 1268866 : int index = GetIndexOperand(operand_index);
144 1268866 : return FeedbackVector::ToSlot(index);
145 : }
146 :
147 19784629 : Register BytecodeArrayAccessor::GetRegisterOperand(int operand_index) const {
148 : OperandType operand_type =
149 : Bytecodes::GetOperandType(current_bytecode(), operand_index);
150 : Address operand_start =
151 19784629 : bytecode_array()->GetFirstBytecodeAddress() + bytecode_offset_ +
152 19784619 : current_prefix_offset() +
153 19784629 : Bytecodes::GetOperandOffset(current_bytecode(), operand_index,
154 19784619 : current_operand_scale());
155 : return BytecodeDecoder::DecodeRegisterOperand(operand_start, operand_type,
156 19784619 : 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 164614 : 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 164614 : uint32_t raw_id = GetUnsignedOperand(operand_index, operand_type);
179 164614 : return static_cast<Runtime::FunctionId>(raw_id);
180 : }
181 :
182 187 : 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);
187 187 : return GetUnsignedOperand(operand_index, operand_type);
188 : }
189 :
190 19626 : 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 19626 : uint32_t raw_id = GetUnsignedOperand(operand_index, operand_type);
196 19626 : return IntrinsicsHelper::ToRuntimeId(
197 19626 : static_cast<IntrinsicsHelper::IntrinsicId>(raw_id));
198 : }
199 :
200 3170472 : Object BytecodeArrayAccessor::GetConstantAtIndex(int index) const {
201 3170472 : return bytecode_array()->constant_pool()->get(index);
202 : }
203 :
204 3105077 : Object BytecodeArrayAccessor::GetConstantForIndexOperand(
205 : int operand_index) const {
206 3123891 : return GetConstantAtIndex(GetIndexOperand(operand_index));
207 : }
208 :
209 1575408 : int BytecodeArrayAccessor::GetJumpTargetOffset() const {
210 : Bytecode bytecode = current_bytecode();
211 1575408 : if (interpreter::Bytecodes::IsJumpImmediate(bytecode)) {
212 1556595 : int relative_offset = GetUnsignedImmediateOperand(0);
213 1556595 : if (bytecode == Bytecode::kJumpLoop) {
214 156013 : relative_offset = -relative_offset;
215 : }
216 1556595 : return GetAbsoluteOffset(relative_offset);
217 18814 : } 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 14972 : JumpTableTargetOffsets BytecodeArrayAccessor::GetJumpTableTargetOffsets()
226 : const {
227 : uint32_t table_start, table_size;
228 : int32_t case_value_base;
229 14972 : if (current_bytecode() == Bytecode::kSwitchOnGeneratorState) {
230 4526 : table_start = GetIndexOperand(1);
231 : table_size = GetUnsignedImmediateOperand(2);
232 : case_value_base = 0;
233 : } else {
234 : DCHECK_EQ(current_bytecode(), Bytecode::kSwitchOnSmiNoFeedback);
235 10446 : table_start = GetIndexOperand(0);
236 : table_size = GetUnsignedImmediateOperand(1);
237 : case_value_base = GetImmediateOperand(2);
238 : }
239 29944 : return JumpTableTargetOffsets(this, table_start, table_size, case_value_base);
240 : }
241 :
242 0 : int BytecodeArrayAccessor::GetAbsoluteOffset(int relative_offset) const {
243 1611542 : 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 14972 : case_value_base_(case_value_base) {}
265 :
266 14972 : JumpTableTargetOffsets::iterator JumpTableTargetOffsets::begin() const {
267 39912 : return iterator(case_value_base_, table_start_, table_start_ + table_size_,
268 54884 : accessor_);
269 : }
270 14972 : JumpTableTargetOffsets::iterator JumpTableTargetOffsets::end() const {
271 19956 : return iterator(case_value_base_ + table_size_, table_start_ + table_size_,
272 54884 : table_start_ + table_size_, accessor_);
273 : }
274 4984 : int JumpTableTargetOffsets::size() const {
275 : int ret = 0;
276 : // TODO(leszeks): Is there a more efficient way of doing this than iterating?
277 15141 : for (const auto& entry : *this) {
278 : USE(entry);
279 10157 : ret++;
280 : }
281 4984 : 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 39912 : table_end_(table_end) {
292 39912 : UpdateAndAdvanceToValid();
293 0 : }
294 :
295 36133 : JumpTableTargetOffset JumpTableTargetOffsets::iterator::operator*() {
296 : DCHECK_LT(table_offset_, table_end_);
297 108399 : return {index_, accessor_->GetAbsoluteOffset(Smi::ToInt(current_))};
298 : }
299 :
300 36133 : JumpTableTargetOffsets::iterator& JumpTableTargetOffsets::iterator::
301 : operator++() {
302 : DCHECK_LT(table_offset_, table_end_);
303 46290 : ++table_offset_;
304 46290 : ++index_;
305 46290 : UpdateAndAdvanceToValid();
306 36133 : return *this;
307 : }
308 :
309 51105 : 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 66246 : return index_ != other.index_;
315 : }
316 :
317 86202 : void JumpTableTargetOffsets::iterator::UpdateAndAdvanceToValid() {
318 86202 : if (table_offset_ >= table_end_) return;
319 :
320 46564 : Object current = accessor_->GetConstantAtIndex(table_offset_);
321 46596 : while (!current->IsSmi()) {
322 : DCHECK(current->IsTheHole());
323 290 : ++table_offset_;
324 290 : ++index_;
325 290 : 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 46564 : if (current->IsSmi()) {
330 46290 : current_ = Smi::cast(current);
331 : }
332 : }
333 :
334 : } // namespace interpreter
335 : } // namespace internal
336 120216 : } // namespace v8
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