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(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
38 void operator=(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
41 MCContext &getContext() const { return *Ctx; }
43 TargetLoweringObjectFile() : MCObjectFileInfo(), Ctx(0) {}
45 virtual ~TargetLoweringObjectFile();
47 /// Initialize - this method must be called before any actual lowering is
48 /// done. This specifies the current context for codegen, and gives the
49 /// lowering implementations a chance to set up their default sections.
50 virtual void Initialize(MCContext &ctx, const TargetMachine &TM);
52 virtual void emitPersonalityValue(MCStreamer &Streamer,
53 const TargetMachine &TM,
54 const MCSymbol *Sym) const;
56 /// emitModuleFlags - Emit the module flags that the platform cares about.
57 virtual void emitModuleFlags(MCStreamer &,
58 ArrayRef<Module::ModuleFlagEntry>,
59 Mangler *, const TargetMachine &) const {
62 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
63 /// decide not to emit the UsedDirective for some symbols in llvm.used.
64 /// FIXME: REMOVE this (rdar://7071300)
65 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
70 /// getSectionForConstant - Given a constant with the SectionKind, return a
71 /// section that it should be placed in.
72 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
74 /// getKindForGlobal - Classify the specified global variable into a set of
75 /// target independent categories embodied in SectionKind.
76 static SectionKind getKindForGlobal(const GlobalValue *GV,
77 const TargetMachine &TM);
79 /// SectionForGlobal - This method computes the appropriate section to emit
80 /// the specified global variable or function definition. This should not
81 /// be passed external (or available externally) globals.
82 const MCSection *SectionForGlobal(const GlobalValue *GV,
83 SectionKind Kind, Mangler *Mang,
84 const TargetMachine &TM) const;
86 /// SectionForGlobal - This method computes the appropriate section to emit
87 /// the specified global variable or function definition. This should not
88 /// be passed external (or available externally) globals.
89 const MCSection *SectionForGlobal(const GlobalValue *GV,
91 const TargetMachine &TM) const {
92 return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
95 /// getExplicitSectionGlobal - Targets should implement this method to assign
96 /// a section to globals with an explicit section specfied. The
97 /// implementation of this method can assume that GV->hasSection() is true.
98 virtual const MCSection *
99 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
100 Mangler *Mang, const TargetMachine &TM) const = 0;
102 /// getSpecialCasedSectionGlobals - Allow the target to completely override
103 /// section assignment of a global.
104 virtual const MCSection *
105 getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
106 SectionKind Kind) const {
110 /// getExprForDwarfGlobalReference - Return an MCExpr to use for a reference
111 /// to the specified global variable from exception handling information.
113 virtual const MCExpr *
114 getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
115 MachineModuleInfo *MMI, unsigned Encoding,
116 MCStreamer &Streamer) const;
118 // getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
120 getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
121 MachineModuleInfo *MMI) const;
125 getExprForDwarfReference(const MCSymbol *Sym, unsigned Encoding,
126 MCStreamer &Streamer) const;
128 virtual const MCSection *
129 getStaticCtorSection(unsigned Priority = 65535) const {
131 return StaticCtorSection;
133 virtual const MCSection *
134 getStaticDtorSection(unsigned Priority = 65535) const {
136 return StaticDtorSection;
140 virtual const MCSection *
141 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
142 Mangler *Mang, const TargetMachine &TM) const;
145 } // end namespace llvm