| // 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 "src/compiler/bytecode-branch-analysis.h" |
| |
| #include "src/interpreter/bytecode-array-iterator.h" |
| #include "src/objects-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace compiler { |
| |
| BytecodeBranchAnalysis::BytecodeBranchAnalysis( |
| Handle<BytecodeArray> bytecode_array, Zone* zone) |
| : bytecode_array_(bytecode_array), |
| is_backward_target_(bytecode_array->length(), zone), |
| is_forward_target_(bytecode_array->length(), zone), |
| zone_(zone) {} |
| |
| void BytecodeBranchAnalysis::Analyze() { |
| interpreter::BytecodeArrayIterator iterator(bytecode_array()); |
| while (!iterator.done()) { |
| interpreter::Bytecode bytecode = iterator.current_bytecode(); |
| int current_offset = iterator.current_offset(); |
| if (interpreter::Bytecodes::IsJump(bytecode)) { |
| AddBranch(current_offset, iterator.GetJumpTargetOffset()); |
| } |
| iterator.Advance(); |
| } |
| } |
| |
| void BytecodeBranchAnalysis::AddBranch(int source_offset, int target_offset) { |
| if (source_offset < target_offset) { |
| is_forward_target_.Add(target_offset); |
| } else { |
| is_backward_target_.Add(target_offset); |
| } |
| } |
| |
| } // namespace compiler |
| } // namespace internal |
| } // namespace v8 |