1 //===-- llvm/Target/TargetLoweringObjectFile.h - Object Info ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements classes used to handle lowerings specific to common
11 // object file formats.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
16 #define LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
18 #include "llvm/ADT/StringRef.h"
19 #include "llvm/MC/MCObjectFileInfo.h"
20 #include "llvm/MC/SectionKind.h"
23 class MachineModuleInfo;
35 class TargetLoweringObjectFile : public MCObjectFileInfo {
38 TargetLoweringObjectFile(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
39 void operator=(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
42 MCContext &getContext() const { return *Ctx; }
44 TargetLoweringObjectFile() : MCObjectFileInfo(), Ctx(0) {}
46 virtual ~TargetLoweringObjectFile();
48 /// Initialize - this method must be called before any actual lowering is
49 /// done. This specifies the current context for codegen, and gives the
50 /// lowering implementations a chance to set up their default sections.
51 virtual void Initialize(MCContext &ctx, const TargetMachine &TM);
53 virtual void emitPersonalityValue(MCStreamer &Streamer,
54 const TargetMachine &TM,
55 const MCSymbol *Sym) const;
57 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
58 /// decide not to emit the UsedDirective for some symbols in llvm.used.
59 /// FIXME: REMOVE this (rdar://7071300)
60 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
65 /// getSectionForConstant - Given a constant with the SectionKind, return a
66 /// section that it should be placed in.
67 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
69 /// getKindForGlobal - Classify the specified global variable into a set of
70 /// target independent categories embodied in SectionKind.
71 static SectionKind getKindForGlobal(const GlobalValue *GV,
72 const TargetMachine &TM);
74 /// SectionForGlobal - This method computes the appropriate section to emit
75 /// the specified global variable or function definition. This should not
76 /// be passed external (or available externally) globals.
77 const MCSection *SectionForGlobal(const GlobalValue *GV,
78 SectionKind Kind, Mangler *Mang,
79 const TargetMachine &TM) const;
81 /// SectionForGlobal - This method computes the appropriate section to emit
82 /// the specified global variable or function definition. This should not
83 /// be passed external (or available externally) globals.
84 const MCSection *SectionForGlobal(const GlobalValue *GV,
86 const TargetMachine &TM) const {
87 return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
92 /// getExplicitSectionGlobal - Targets should implement this method to assign
93 /// a section to globals with an explicit section specfied. The
94 /// implementation of this method can assume that GV->hasSection() is true.
95 virtual const MCSection *
96 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
97 Mangler *Mang, const TargetMachine &TM) const = 0;
99 /// getSpecialCasedSectionGlobals - Allow the target to completely override
100 /// section assignment of a global.
101 virtual const MCSection *
102 getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
103 SectionKind Kind) const {
107 /// getExprForDwarfGlobalReference - Return an MCExpr to use for a reference
108 /// to the specified global variable from exception handling information.
110 virtual const MCExpr *
111 getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
112 MachineModuleInfo *MMI, unsigned Encoding,
113 MCStreamer &Streamer) const;
115 // getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
117 getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
118 MachineModuleInfo *MMI) const;
122 getExprForDwarfReference(const MCSymbol *Sym, unsigned Encoding,
123 MCStreamer &Streamer) const;
125 virtual const MCSection *
126 getStaticCtorSection(unsigned Priority = 65535) const {
128 return StaticCtorSection;
130 virtual const MCSection *
131 getStaticDtorSection(unsigned Priority = 65535) const {
133 return StaticDtorSection;
137 virtual const MCSection *
138 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
139 Mangler *Mang, const TargetMachine &TM) const;
142 } // end namespace llvm