LLVM  10.0.0svn
LiveStacks.h
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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 
20 #include "llvm/Pass.h"
21 #include <cassert>
22 #include <map>
23 #include <unordered_map>
24 
25 namespace llvm {
26 
27 class TargetRegisterClass;
28 class TargetRegisterInfo;
29 
31  const TargetRegisterInfo *TRI;
32 
33  /// Special pool allocator for VNInfo's (LiveInterval val#).
34  ///
35  VNInfo::Allocator VNInfoAllocator;
36 
37  /// S2IMap - Stack slot indices to live interval mapping.
38  using SS2IntervalMap = std::unordered_map<int, LiveInterval>;
39  SS2IntervalMap S2IMap;
40 
41  /// S2RCMap - Stack slot indices to register class mapping.
42  std::map<int, const TargetRegisterClass *> S2RCMap;
43 
44 public:
45  static char ID; // Pass identification, replacement for typeid
46 
49  }
50 
51  using iterator = SS2IntervalMap::iterator;
52  using const_iterator = SS2IntervalMap::const_iterator;
53 
54  const_iterator begin() const { return S2IMap.begin(); }
55  const_iterator end() const { return S2IMap.end(); }
56  iterator begin() { return S2IMap.begin(); }
57  iterator end() { return S2IMap.end(); }
58 
59  unsigned getNumIntervals() const { return (unsigned)S2IMap.size(); }
60 
62 
64  assert(Slot >= 0 && "Spill slot indice must be >= 0");
65  SS2IntervalMap::iterator I = S2IMap.find(Slot);
66  assert(I != S2IMap.end() && "Interval does not exist for stack slot");
67  return I->second;
68  }
69 
70  const LiveInterval &getInterval(int Slot) const {
71  assert(Slot >= 0 && "Spill slot indice must be >= 0");
72  SS2IntervalMap::const_iterator I = S2IMap.find(Slot);
73  assert(I != S2IMap.end() && "Interval does not exist for stack slot");
74  return I->second;
75  }
76 
77  bool hasInterval(int Slot) const { return S2IMap.count(Slot); }
78 
79  const TargetRegisterClass *getIntervalRegClass(int Slot) const {
80  assert(Slot >= 0 && "Spill slot indice must be >= 0");
81  std::map<int, const TargetRegisterClass *>::const_iterator I =
82  S2RCMap.find(Slot);
83  assert(I != S2RCMap.end() &&
84  "Register class info does not exist for stack slot");
85  return I->second;
86  }
87 
88  VNInfo::Allocator &getVNInfoAllocator() { return VNInfoAllocator; }
89 
90  void getAnalysisUsage(AnalysisUsage &AU) const override;
91  void releaseMemory() override;
92 
93  /// runOnMachineFunction - pass entry point
94  bool runOnMachineFunction(MachineFunction &) override;
95 
96  /// print - Implement the dump method.
97  void print(raw_ostream &O, const Module * = nullptr) const override;
98 };
99 
100 } // end namespace llvm
101 
102 #endif
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
This class represents lattice values for constants.
Definition: AllocatorList.h:23
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:66
SS2IntervalMap::const_iterator const_iterator
Definition: LiveStacks.h:52
LiveInterval - This class represents the liveness of a register, or stack slot.
Definition: LiveInterval.h:679
LiveInterval & getInterval(int Slot)
Definition: LiveStacks.h:63
VNInfo::Allocator & getVNInfoAllocator()
Definition: LiveStacks.h:88
MachineFunctionPass - This class adapts the FunctionPass interface to allow convenient creation of pa...
const LiveInterval & getInterval(int Slot) const
Definition: LiveStacks.h:70
LiveInterval & getOrCreateInterval(int Slot, const TargetRegisterClass *RC)
Definition: LiveStacks.cpp:57
static char ID
Definition: LiveStacks.h:45
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - This function should be overriden by passes that need analysis information to do t...
Definition: LiveStacks.cpp:35
const_iterator begin() const
Definition: LiveStacks.h:54
iterator begin()
Definition: LiveStacks.h:56
Allocate memory in an ever growing pool, as if by bump-pointer.
Definition: Allocator.h:141
void initializeLiveStacksPass(PassRegistry &)
Represent the analysis usage information of a pass.
TargetRegisterInfo base class - We assume that the target defines a static array of TargetRegisterDes...
SS2IntervalMap::iterator iterator
Definition: LiveStacks.h:51
bool runOnMachineFunction(MachineFunction &) override
runOnMachineFunction - pass entry point
Definition: LiveStacks.cpp:49
unsigned getNumIntervals() const
Definition: LiveStacks.h:59
#define I(x, y, z)
Definition: MD5.cpp:58
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
bool hasInterval(int Slot) const
Definition: LiveStacks.h:77
const TargetRegisterClass * getIntervalRegClass(int Slot) const
Definition: LiveStacks.h:79
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:45
void releaseMemory() override
releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memo...
Definition: LiveStacks.cpp:42
iterator end()
Definition: LiveStacks.h:57
const_iterator end() const
Definition: LiveStacks.h:55
void print(raw_ostream &O, const Module *=nullptr) const override
print - Implement the dump method.
Definition: LiveStacks.cpp:76