src/llvm/include/llvm/CodeGen/PBQPRAConstraint.h

   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 <memory>
  20 #include <vector>
  21
  22 namespace llvm {
  23 namespace PBQP {
  24 namespace RegAlloc {
  25 // Forward declare PBQP graph class.
  26 class PBQPRAGraph;
  27 }
  28 }
  29
  30 class LiveIntervals;
  31 class MachineBlockFrequencyInfo;
  32 class MachineFunction;
  33 class TargetRegisterInfo;
  34
  35 typedef PBQP::RegAlloc::PBQPRAGraph PBQPRAGraph;
  36
  37 /// @brief Abstract base for classes implementing PBQP register allocation
  38 ///        constraints (e.g. Spill-costs, interference, coalescing).
  39 class PBQPRAConstraint {
  40 public:
  41   virtual ~PBQPRAConstraint() = 0;
  42   virtual void apply(PBQPRAGraph &G) = 0;
  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 private:
  63   std::vector<std::unique_ptr<PBQPRAConstraint>> Constraints;
  64   void anchor() override;
  65 };
  66
  67 }
  68
  69 #endif /* LLVM_CODEGEN_PBQPRACONSTRAINT_H */