1 //===- RegAllocPBQP.h -------------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines the PBQPBuilder interface, for classes which build PBQP 11 // instances to represent register allocation problems, and the RegAllocPBQP 12 // interface. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #ifndef LLVM_CODEGEN_PBQPRACONSTRAINT_H 17 #define LLVM_CODEGEN_PBQPRACONSTRAINT_H 18 19 #include <algorithm> 20 #include <memory> 21 #include <vector> 22 23 namespace llvm { 24 25 namespace PBQP { 26 namespace RegAlloc { 27 28 // Forward declare PBQP graph class. 29 class PBQPRAGraph; 30 31 } // end namespace RegAlloc 32 } // end namespace PBQP 33 34 using PBQPRAGraph = PBQP::RegAlloc::PBQPRAGraph; 35 36 /// @brief Abstract base for classes implementing PBQP register allocation 37 /// constraints (e.g. Spill-costs, interference, coalescing). 38 class PBQPRAConstraint { 39 public: 40 virtual ~PBQPRAConstraint() = 0; 41 virtual void apply(PBQPRAGraph &G) = 0; 42 43 private: 44 virtual void anchor(); 45 }; 46 47 /// @brief PBQP register allocation constraint composer. 48 /// 49 /// Constraints added to this list will be applied, in the order that they are 50 /// added, to the PBQP graph. 51 class PBQPRAConstraintList : public PBQPRAConstraint { 52 public: 53 void apply(PBQPRAGraph &G) override { 54 for (auto &C : Constraints) 55 C->apply(G); 56 } 57 58 void addConstraint(std::unique_ptr<PBQPRAConstraint> C) { 59 if (C) 60 Constraints.push_back(std::move(C)); 61 } 62 63 private: 64 std::vector<std::unique_ptr<PBQPRAConstraint>> Constraints; 65 66 void anchor() override; 67 }; 68 69 } // end namespace llvm 70 71 #endif // LLVM_CODEGEN_PBQPRACONSTRAINT_H 72
