| 1 | //===- llvm/CodeGen/PBQPRAConstraint.h --------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file defines the PBQPBuilder interface, for classes which build PBQP |
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| 10 | // instances to represent register allocation problems, and the RegAllocPBQP |
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| 11 | // interface. |
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| 12 | // |
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| 13 | //===----------------------------------------------------------------------===// |
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| 14 | |
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| 15 | #ifndef LLVM_CODEGEN_PBQPRACONSTRAINT_H |
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| 16 | #define LLVM_CODEGEN_PBQPRACONSTRAINT_H |
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| 17 | |
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| 18 | #include <algorithm> |
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| 19 | #include <memory> |
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| 20 | #include <vector> |
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| 21 | |
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| 22 | namespace llvm { |
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| 23 | |
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| 24 | namespace PBQP { |
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| 25 | namespace RegAlloc { |
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| 26 | |
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| 27 | // Forward declare PBQP graph class. |
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| 28 | class PBQPRAGraph; |
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| 29 | |
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| 30 | } // end namespace RegAlloc |
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| 31 | } // end namespace PBQP |
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| 32 | |
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| 33 | using PBQPRAGraph = PBQP::RegAlloc::PBQPRAGraph; |
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| 34 | |
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| 35 | /// Abstract base for classes implementing PBQP register allocation |
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| 36 | /// constraints (e.g. Spill-costs, interference, coalescing). |
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| 37 | class PBQPRAConstraint { |
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| 38 | public: |
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| 39 | virtual ~PBQPRAConstraint() = 0; |
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| 40 | virtual void apply(PBQPRAGraph &G) = 0; |
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| 41 | |
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| 42 | private: |
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| 43 | virtual void anchor(); |
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| 44 | }; |
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| 45 | |
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| 46 | /// PBQP register allocation constraint composer. |
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| 47 | /// |
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| 48 | /// Constraints added to this list will be applied, in the order that they are |
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| 49 | /// added, to the PBQP graph. |
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| 50 | class PBQPRAConstraintList : public PBQPRAConstraint { |
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| 51 | public: |
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| 52 | void apply(PBQPRAGraph &G) override { |
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| 53 | for (auto &C : Constraints) |
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| 54 | C->apply(G); |
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| 55 | } |
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| 56 | |
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| 57 | void addConstraint(std::unique_ptr<PBQPRAConstraint> C) { |
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| 58 | if (C) |
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| 59 | Constraints.push_back(x: std::move(C)); |
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| 60 | } |
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| 61 | |
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| 62 | private: |
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| 63 | std::vector<std::unique_ptr<PBQPRAConstraint>> Constraints; |
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| 64 | |
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| 65 | void anchor() override; |
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| 66 | }; |
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| 67 | |
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| 68 | } // end namespace llvm |
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| 69 | |
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| 70 | #endif // LLVM_CODEGEN_PBQPRACONSTRAINT_H |
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| 71 | |
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