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// 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
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