71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
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//===- llvm/CodeGen/PBQPRAConstraint.h --------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the PBQPBuilder interface, for classes which build PBQP
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// instances to represent register allocation problems, and the RegAllocPBQP
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// interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_PBQPRACONSTRAINT_H
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#define LLVM_CODEGEN_PBQPRACONSTRAINT_H
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#include <algorithm>
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#include <memory>
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#include <vector>
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namespace llvm {
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namespace PBQP {
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namespace RegAlloc {
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// Forward declare PBQP graph class.
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class PBQPRAGraph;
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} // end namespace RegAlloc
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} // end namespace PBQP
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using PBQPRAGraph = PBQP::RegAlloc::PBQPRAGraph;
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/// Abstract base for classes implementing PBQP register allocation
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/// constraints (e.g. Spill-costs, interference, coalescing).
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class PBQPRAConstraint {
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public:
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virtual ~PBQPRAConstraint() = 0;
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virtual void apply(PBQPRAGraph &G) = 0;
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private:
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virtual void anchor();
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};
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/// PBQP register allocation constraint composer.
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///
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/// Constraints added to this list will be applied, in the order that they are
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/// added, to the PBQP graph.
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class PBQPRAConstraintList : public PBQPRAConstraint {
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public:
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void apply(PBQPRAGraph &G) override {
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for (auto &C : Constraints)
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C->apply(G);
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}
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void addConstraint(std::unique_ptr<PBQPRAConstraint> C) {
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if (C)
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Constraints.push_back(std::move(C));
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}
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private:
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std::vector<std::unique_ptr<PBQPRAConstraint>> Constraints;
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void anchor() override;
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};
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} // end namespace llvm
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#endif // LLVM_CODEGEN_PBQPRACONSTRAINT_H
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