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/Module.h"
19 #include "llvm/MC/MCObjectFileInfo.h"
20 #include "llvm/MC/SectionKind.h"
21 #include "llvm/ADT/ArrayRef.h"
24 class MachineModuleInfo;
34 class TargetLoweringObjectFile : public MCObjectFileInfo {
37 TargetLoweringObjectFile(
38 const TargetLoweringObjectFile&) LLVM_DELETED_FUNCTION;
39 void operator=(const TargetLoweringObjectFile&) LLVM_DELETED_FUNCTION;
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 /// emitModuleFlags - Emit the module flags that the platform cares about.
58 virtual void emitModuleFlags(MCStreamer &,
59 ArrayRef<Module::ModuleFlagEntry>,
60 Mangler *, const TargetMachine &) const {
63 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
64 /// decide not to emit the UsedDirective for some symbols in llvm.used.
65 /// FIXME: REMOVE this (rdar://7071300)
66 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
71 /// getSectionForConstant - Given a constant with the SectionKind, return a
72 /// section that it should be placed in.
73 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
75 /// getKindForGlobal - Classify the specified global variable into a set of
76 /// target independent categories embodied in SectionKind.
77 static SectionKind getKindForGlobal(const GlobalValue *GV,
78 const TargetMachine &TM);
80 /// SectionForGlobal - This method computes the appropriate section to emit
81 /// the specified global variable or function definition. This should not
82 /// be passed external (or available externally) globals.
83 const MCSection *SectionForGlobal(const GlobalValue *GV,
84 SectionKind Kind, Mangler *Mang,
85 const TargetMachine &TM) const;
87 /// SectionForGlobal - This method computes the appropriate section to emit
88 /// the specified global variable or function definition. This should not
89 /// be passed external (or available externally) globals.
90 const MCSection *SectionForGlobal(const GlobalValue *GV,
92 const TargetMachine &TM) const {
93 return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
96 /// getExplicitSectionGlobal - Targets should implement this method to assign
97 /// a section to globals with an explicit section specfied. The
98 /// implementation of this method can assume that GV->hasSection() is true.
99 virtual const MCSection *
100 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
101 Mangler *Mang, const TargetMachine &TM) const = 0;
103 /// getSpecialCasedSectionGlobals - Allow the target to completely override
104 /// section assignment of a global.
105 virtual const MCSection *
106 getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
107 SectionKind Kind) const {
111 /// getExprForDwarfGlobalReference - Return an MCExpr to use for a reference
112 /// to the specified global variable from exception handling information.
114 virtual const MCExpr *
115 getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
116 MachineModuleInfo *MMI, unsigned Encoding,
117 MCStreamer &Streamer) const;
119 // getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
121 getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
122 MachineModuleInfo *MMI) const;
126 getExprForDwarfReference(const MCSymbol *Sym, unsigned Encoding,
127 MCStreamer &Streamer) const;
129 virtual const MCSection *
130 getStaticCtorSection(unsigned Priority = 65535) const {
132 return StaticCtorSection;
134 virtual const MCSection *
135 getStaticDtorSection(unsigned Priority = 65535) const {
137 return StaticDtorSection;
141 virtual const MCSection *
142 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
143 Mangler *Mang, const TargetMachine &TM) const;
146 } // end namespace llvm