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/compiler/bytecode-branch-analysis.h" 6 7 #include "src/interpreter/bytecode-array-iterator.h" 8 #include "src/objects-inl.h" 9 10 namespace v8 { 11 namespace internal { 12 namespace compiler { 13 14 BytecodeBranchAnalysis::BytecodeBranchAnalysis( 15 Handle<BytecodeArray> bytecode_array, Zone* zone) 16 : bytecode_array_(bytecode_array), 17 is_backward_target_(bytecode_array->length(), zone), 18 is_forward_target_(bytecode_array->length(), zone), 19 zone_(zone) {} 20 21 void BytecodeBranchAnalysis::Analyze() { 22 interpreter::BytecodeArrayIterator iterator(bytecode_array()); 23 while (!iterator.done()) { 24 interpreter::Bytecode bytecode = iterator.current_bytecode(); 25 int current_offset = iterator.current_offset(); 26 if (interpreter::Bytecodes::IsJump(bytecode)) { 27 AddBranch(current_offset, iterator.GetJumpTargetOffset()); 28 } 29 iterator.Advance(); 30 } 31 } 32 33 void BytecodeBranchAnalysis::AddBranch(int source_offset, int target_offset) { 34 if (source_offset < target_offset) { 35 is_forward_target_.Add(target_offset); 36 } else { 37 is_backward_target_.Add(target_offset); 38 } 39 } 40 41 } // namespace compiler 42 } // namespace internal 43 } // namespace v8 44
