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1 // Copyright 2015 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/interpreter/bytecode-array-writer.h" | 5 #include "src/interpreter/bytecode-array-writer.h" |
6 | 6 |
7 #include "src/api.h" | 7 #include "src/api.h" |
8 #include "src/interpreter/bytecode-label.h" | 8 #include "src/interpreter/bytecode-label.h" |
9 #include "src/interpreter/bytecode-register.h" | 9 #include "src/interpreter/bytecode-register.h" |
10 #include "src/interpreter/constant-array-builder.h" | 10 #include "src/interpreter/constant-array-builder.h" |
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283 // Label has been bound already so this is a backwards jump. | 283 // Label has been bound already so this is a backwards jump. |
284 size_t abs_delta = current_offset - label->offset(); | 284 size_t abs_delta = current_offset - label->offset(); |
285 int delta = -static_cast<int>(abs_delta); | 285 int delta = -static_cast<int>(abs_delta); |
286 OperandScale operand_scale = Bytecodes::ScaleForSignedOperand(delta); | 286 OperandScale operand_scale = Bytecodes::ScaleForSignedOperand(delta); |
287 if (operand_scale > OperandScale::kSingle) { | 287 if (operand_scale > OperandScale::kSingle) { |
288 // Adjust for scaling byte prefix for wide jump offset. | 288 // Adjust for scaling byte prefix for wide jump offset. |
289 DCHECK_LE(delta, 0); | 289 DCHECK_LE(delta, 0); |
290 delta -= 1; | 290 delta -= 1; |
291 } | 291 } |
292 DCHECK_EQ(Bytecode::kJumpLoop, node->bytecode()); | 292 DCHECK_EQ(Bytecode::kJumpLoop, node->bytecode()); |
293 node->set_bytecode(node->bytecode(), delta, node->operand(1)); | 293 node->update_operand0(delta); |
294 } else { | 294 } else { |
295 // The label has not yet been bound so this is a forward reference | 295 // The label has not yet been bound so this is a forward reference |
296 // that will be patched when the label is bound. We create a | 296 // that will be patched when the label is bound. We create a |
297 // reservation in the constant pool so the jump can be patched | 297 // reservation in the constant pool so the jump can be patched |
298 // when the label is bound. The reservation means the maximum size | 298 // when the label is bound. The reservation means the maximum size |
299 // of the operand for the constant is known and the jump can | 299 // of the operand for the constant is known and the jump can |
300 // be emitted into the bytecode stream with space for the operand. | 300 // be emitted into the bytecode stream with space for the operand. |
301 unbound_jumps_++; | 301 unbound_jumps_++; |
302 label->set_referrer(current_offset); | 302 label->set_referrer(current_offset); |
303 OperandSize reserved_operand_size = | 303 OperandSize reserved_operand_size = |
304 constant_array_builder()->CreateReservedEntry(); | 304 constant_array_builder()->CreateReservedEntry(); |
305 DCHECK_NE(Bytecode::kJumpLoop, node->bytecode()); | 305 DCHECK_NE(Bytecode::kJumpLoop, node->bytecode()); |
306 switch (reserved_operand_size) { | 306 switch (reserved_operand_size) { |
307 case OperandSize::kNone: | 307 case OperandSize::kNone: |
308 UNREACHABLE(); | 308 UNREACHABLE(); |
309 break; | 309 break; |
310 case OperandSize::kByte: | 310 case OperandSize::kByte: |
311 node->set_bytecode(node->bytecode(), k8BitJumpPlaceholder); | 311 node->update_operand0(k8BitJumpPlaceholder); |
312 break; | 312 break; |
313 case OperandSize::kShort: | 313 case OperandSize::kShort: |
314 node->set_bytecode(node->bytecode(), k16BitJumpPlaceholder); | 314 node->update_operand0(k16BitJumpPlaceholder); |
315 break; | 315 break; |
316 case OperandSize::kQuad: | 316 case OperandSize::kQuad: |
317 node->set_bytecode(node->bytecode(), k32BitJumpPlaceholder); | 317 node->update_operand0(k32BitJumpPlaceholder); |
318 break; | 318 break; |
319 } | 319 } |
320 } | 320 } |
321 EmitBytecode(node); | 321 EmitBytecode(node); |
322 } | 322 } |
323 | 323 |
324 } // namespace interpreter | 324 } // namespace interpreter |
325 } // namespace internal | 325 } // namespace internal |
326 } // namespace v8 | 326 } // namespace v8 |
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