LLVM  8.0.0svn
Comdat.h
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1 //===- llvm/IR/Comdat.h - Comdat definitions --------------------*- 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 /// @file
11 /// This file contains the declaration of the Comdat class, which represents a
12 /// single COMDAT in LLVM.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_IR_COMDAT_H
17 #define LLVM_IR_COMDAT_H
18 
19 #include "llvm-c/Types.h"
21 
22 namespace llvm {
23 
24 class raw_ostream;
25 class StringRef;
26 template <typename ValueTy> class StringMapEntry;
27 
28 // This is a Name X SelectionKind pair. The reason for having this be an
29 // independent object instead of just adding the name and the SelectionKind
30 // to a GlobalObject is that it is invalid to have two Comdats with the same
31 // name but different SelectionKind. This structure makes that unrepresentable.
32 class Comdat {
33 public:
35  Any, ///< The linker may choose any COMDAT.
36  ExactMatch, ///< The data referenced by the COMDAT must be the same.
37  Largest, ///< The linker will choose the largest COMDAT.
38  NoDuplicates, ///< No other Module may specify this COMDAT.
39  SameSize, ///< The data referenced by the COMDAT must be the same size.
40  };
41 
42  Comdat(const Comdat &) = delete;
43  Comdat(Comdat &&C);
44 
45  SelectionKind getSelectionKind() const { return SK; }
46  void setSelectionKind(SelectionKind Val) { SK = Val; }
47  StringRef getName() const;
48  void print(raw_ostream &OS, bool IsForDebug = false) const;
49  void dump() const;
50 
51 private:
52  friend class Module;
53 
54  Comdat();
55 
56  // Points to the map in Module.
57  StringMapEntry<Comdat> *Name = nullptr;
58  SelectionKind SK = Any;
59 };
60 
61 // Create wrappers for C Binding types (see CBindingWrapping.h).
63 
65  C.print(OS);
66  return OS;
67 }
68 
69 } // end namespace llvm
70 
71 #endif // LLVM_IR_COMDAT_H
uint64_t CallInst * C
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
StringMapEntry - This is used to represent one value that is inserted into a StringMap.
Definition: StringMap.h:126
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:64
The data referenced by the COMDAT must be the same size.
Definition: Comdat.h:39
struct LLVMComdat * LLVMComdatRef
Definition: Types.h:154
amdgpu Simplify well known AMD library false Value Value const Twine & Name
#define DEFINE_SIMPLE_CONVERSION_FUNCTIONS(ty, ref)
The linker may choose any COMDAT.
Definition: Comdat.h:35
void dump() const
Definition: AsmWriter.cpp:4285
No other Module may specify this COMDAT.
Definition: Comdat.h:38
StringRef getName() const
Definition: Comdat.cpp:27
void print(raw_ostream &OS, bool IsForDebug=false) const
Definition: AsmWriter.cpp:4069
amdgpu inline
The data referenced by the COMDAT must be the same.
Definition: Comdat.h:36
void setSelectionKind(SelectionKind Val)
Definition: Comdat.h:46
The linker will choose the largest COMDAT.
Definition: Comdat.h:37
aarch64 promote const
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
SelectionKind getSelectionKind() const
Definition: Comdat.h:45