LLVM  8.0.0svn
RegisterUsageInfo.h
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1 //==- RegisterUsageInfo.h - Register Usage Informartion Storage --*- 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 /// \file
10 /// This pass is required to take advantage of the interprocedural register
11 /// allocation infrastructure.
12 ///
13 /// This pass is simple immutable pass which keeps RegMasks (calculated based on
14 /// actual register allocation) for functions in a module and provides simple
15 /// API to query this information.
16 ///
17 //===----------------------------------------------------------------------===//
18 
19 #ifndef LLVM_CODEGEN_PHYSICALREGISTERUSAGEINFO_H
20 #define LLVM_CODEGEN_PHYSICALREGISTERUSAGEINFO_H
21 
22 #include "llvm/ADT/ArrayRef.h"
23 #include "llvm/ADT/DenseMap.h"
24 #include "llvm/IR/Instructions.h"
25 #include "llvm/Pass.h"
26 #include <cstdint>
27 #include <vector>
28 
29 namespace llvm {
30 
31 class Function;
32 class TargetMachine;
33 
35 public:
36  static char ID;
37 
41  }
42 
43  /// Set TargetMachine which is used to print analysis.
44  void setTargetMachine(const TargetMachine &TM);
45 
46  bool doInitialization(Module &M) override;
47 
48  bool doFinalization(Module &M) override;
49 
50  /// To store RegMask for given Function *.
51  void storeUpdateRegUsageInfo(const Function &FP,
52  ArrayRef<uint32_t> RegMask);
53 
54  /// To query stored RegMask for given Function *, it will returns ane empty
55  /// array if function is not known.
57 
58  void print(raw_ostream &OS, const Module *M = nullptr) const override;
59 
60 private:
61  /// A Dense map from Function * to RegMask.
62  /// In RegMask 0 means register used (clobbered) by function.
63  /// and 1 means content of register will be preserved around function call.
65 
66  const TargetMachine *TM;
67 };
68 
69 } // end namespace llvm
70 
71 #endif // LLVM_CODEGEN_PHYSICALREGISTERUSAGEINFO_H
ArrayRef< uint32_t > getRegUsageInfo(const Function &FP)
To query stored RegMask for given Function *, it will returns ane empty array if function is not know...
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:64
A global registry used in conjunction with static constructors to make pluggable components (like tar...
Definition: Registry.h:45
void print(raw_ostream &OS, const Module *M=nullptr) const override
print - Print out the internal state of the pass.
bool doInitialization(Module &M) override
doInitialization - Virtual method overridden by subclasses to do any necessary initialization before ...
bool doFinalization(Module &M) override
doFinalization - Virtual method overriden by subclasses to do any necessary clean up after all passes...
void setTargetMachine(const TargetMachine &TM)
Set TargetMachine which is used to print analysis.
void initializePhysicalRegisterUsageInfoPass(PassRegistry &)
void storeUpdateRegUsageInfo(const Function &FP, ArrayRef< uint32_t > RegMask)
To store RegMask for given Function *.
ImmutablePass class - This class is used to provide information that does not need to be run...
Definition: Pass.h:256
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:59
PassRegistry - This class manages the registration and intitialization of the pass subsystem as appli...
Definition: PassRegistry.h:39