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  1. //===- LiveStacks.h - Live Stack Slot Analysis ------------------*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. //
  9. // This file implements the live stack slot analysis pass. It is analogous to
  10. // live interval analysis except it's analyzing liveness of stack slots rather
  11. // than registers.
  12. //
  13. //===----------------------------------------------------------------------===//
  14.  
  15. #ifndef LLVM_CODEGEN_LIVESTACKS_H
  16. #define LLVM_CODEGEN_LIVESTACKS_H
  17.  
  18. #include "llvm/CodeGen/LiveInterval.h"
  19. #include "llvm/CodeGen/MachineFunctionPass.h"
  20. #include "llvm/InitializePasses.h"
  21. #include "llvm/PassRegistry.h"
  22. #include <cassert>
  23. #include <map>
  24. #include <unordered_map>
  25.  
  26. namespace llvm {
  27.  
  28. class AnalysisUsage;
  29. class MachineFunction;
  30. class Module;
  31. class raw_ostream;
  32. class TargetRegisterClass;
  33. class TargetRegisterInfo;
  34.  
  35. class LiveStacks : public MachineFunctionPass {
  36.   const TargetRegisterInfo *TRI;
  37.  
  38.   /// Special pool allocator for VNInfo's (LiveInterval val#).
  39.   ///
  40.   VNInfo::Allocator VNInfoAllocator;
  41.  
  42.   /// S2IMap - Stack slot indices to live interval mapping.
  43.   using SS2IntervalMap = std::unordered_map<int, LiveInterval>;
  44.   SS2IntervalMap S2IMap;
  45.  
  46.   /// S2RCMap - Stack slot indices to register class mapping.
  47.   std::map<int, const TargetRegisterClass *> S2RCMap;
  48.  
  49. public:
  50.   static char ID; // Pass identification, replacement for typeid
  51.  
  52.   LiveStacks() : MachineFunctionPass(ID) {
  53.     initializeLiveStacksPass(*PassRegistry::getPassRegistry());
  54.   }
  55.  
  56.   using iterator = SS2IntervalMap::iterator;
  57.   using const_iterator = SS2IntervalMap::const_iterator;
  58.  
  59.   const_iterator begin() const { return S2IMap.begin(); }
  60.   const_iterator end() const { return S2IMap.end(); }
  61.   iterator begin() { return S2IMap.begin(); }
  62.   iterator end() { return S2IMap.end(); }
  63.  
  64.   unsigned getNumIntervals() const { return (unsigned)S2IMap.size(); }
  65.  
  66.   LiveInterval &getOrCreateInterval(int Slot, const TargetRegisterClass *RC);
  67.  
  68.   LiveInterval &getInterval(int Slot) {
  69.     assert(Slot >= 0 && "Spill slot indice must be >= 0");
  70.     SS2IntervalMap::iterator I = S2IMap.find(Slot);
  71.     assert(I != S2IMap.end() && "Interval does not exist for stack slot");
  72.     return I->second;
  73.   }
  74.  
  75.   const LiveInterval &getInterval(int Slot) const {
  76.     assert(Slot >= 0 && "Spill slot indice must be >= 0");
  77.     SS2IntervalMap::const_iterator I = S2IMap.find(Slot);
  78.     assert(I != S2IMap.end() && "Interval does not exist for stack slot");
  79.     return I->second;
  80.   }
  81.  
  82.   bool hasInterval(int Slot) const { return S2IMap.count(Slot); }
  83.  
  84.   const TargetRegisterClass *getIntervalRegClass(int Slot) const {
  85.     assert(Slot >= 0 && "Spill slot indice must be >= 0");
  86.     std::map<int, const TargetRegisterClass *>::const_iterator I =
  87.         S2RCMap.find(Slot);
  88.     assert(I != S2RCMap.end() &&
  89.            "Register class info does not exist for stack slot");
  90.     return I->second;
  91.   }
  92.  
  93.   VNInfo::Allocator &getVNInfoAllocator() { return VNInfoAllocator; }
  94.  
  95.   void getAnalysisUsage(AnalysisUsage &AU) const override;
  96.   void releaseMemory() override;
  97.  
  98.   /// runOnMachineFunction - pass entry point
  99.   bool runOnMachineFunction(MachineFunction &) override;
  100.  
  101.   /// print - Implement the dump method.
  102.   void print(raw_ostream &O, const Module * = nullptr) const override;
  103. };
  104.  
  105. } // end namespace llvm
  106.  
  107. #endif
  108.