64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
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// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_LIVE_RANGE_BUILDER_H_
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#define V8_LIVE_RANGE_BUILDER_H_
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#include "src/compiler/register-allocator.h"
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namespace v8 {
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namespace internal {
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namespace compiler {
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// Utility offering shorthand syntax for building up a range by providing its ID
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// and pairs (start, end) specifying intervals. Circumvents current incomplete
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// support for C++ features such as instantiation lists, on OS X and Android.
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class TestRangeBuilder {
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public:
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explicit TestRangeBuilder(Zone* zone) : id_(-1), pairs_(), zone_(zone) {}
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TestRangeBuilder& Id(int id) {
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id_ = id;
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return *this;
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}
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TestRangeBuilder& Add(int start, int end) {
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pairs_.push_back({start, end});
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return *this;
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}
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LiveRange* Build(int start, int end) { return Add(start, end).Build(); }
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LiveRange* Build() {
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TopLevelLiveRange* range =
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new (zone_) TopLevelLiveRange(id_, MachineType::kRepTagged);
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// Traverse the provided interval specifications backwards, because that is
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// what LiveRange expects.
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for (int i = static_cast<int>(pairs_.size()) - 1; i >= 0; --i) {
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Interval pair = pairs_[i];
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LifetimePosition start = LifetimePosition::FromInt(pair.first);
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LifetimePosition end = LifetimePosition::FromInt(pair.second);
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CHECK(start < end);
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range->AddUseInterval(start, end, zone_);
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}
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pairs_.clear();
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return range;
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}
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private:
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typedef std::pair<int, int> Interval;
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typedef std::vector<Interval> IntervalList;
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int id_;
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IntervalList pairs_;
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Zone* zone_;
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};
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} // namespace compiler
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} // namespace internal
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} // namespace v8
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#endif // V8_LIVE_RANGE_BUILDER_H_
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