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/ArrayRef.h"
19 #include "llvm/IR/Module.h"
20 #include "llvm/MC/MCObjectFileInfo.h"
21 #include "llvm/MC/SectionKind.h"
24 class MachineModuleInfo;
30 class MCSymbolRefExpr;
35 class TargetLoweringObjectFile : public MCObjectFileInfo {
38 TargetLoweringObjectFile(
39 const TargetLoweringObjectFile&) LLVM_DELETED_FUNCTION;
40 void operator=(const TargetLoweringObjectFile&) LLVM_DELETED_FUNCTION;
43 MCContext &getContext() const { return *Ctx; }
45 TargetLoweringObjectFile() : MCObjectFileInfo(), Ctx(0) {}
47 virtual ~TargetLoweringObjectFile();
49 /// Initialize - this method must be called before any actual lowering is
50 /// done. This specifies the current context for codegen, and gives the
51 /// lowering implementations a chance to set up their default sections.
52 virtual void Initialize(MCContext &ctx, const TargetMachine &TM);
54 virtual void emitPersonalityValue(MCStreamer &Streamer,
55 const TargetMachine &TM,
56 const MCSymbol *Sym) const;
58 /// emitModuleFlags - Emit the module flags that the platform cares about.
59 virtual void emitModuleFlags(MCStreamer &,
60 ArrayRef<Module::ModuleFlagEntry>,
61 Mangler *, const TargetMachine &) const {
64 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
65 /// decide not to emit the UsedDirective for some symbols in llvm.used.
66 /// FIXME: REMOVE this (rdar://7071300)
67 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
72 /// getSectionForConstant - Given a constant with the SectionKind, return a
73 /// section that it should be placed in.
74 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
76 /// getKindForGlobal - Classify the specified global variable into a set of
77 /// target independent categories embodied in SectionKind.
78 static SectionKind getKindForGlobal(const GlobalValue *GV,
79 const TargetMachine &TM);
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,
85 SectionKind Kind, Mangler *Mang,
86 const TargetMachine &TM) const;
88 /// SectionForGlobal - This method computes the appropriate section to emit
89 /// the specified global variable or function definition. This should not
90 /// be passed external (or available externally) globals.
91 const MCSection *SectionForGlobal(const GlobalValue *GV,
93 const TargetMachine &TM) const {
94 return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
97 /// getExplicitSectionGlobal - Targets should implement this method to assign
98 /// a section to globals with an explicit section specfied. The
99 /// implementation of this method can assume that GV->hasSection() is true.
100 virtual const MCSection *
101 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
102 Mangler *Mang, const TargetMachine &TM) const = 0;
104 /// getSpecialCasedSectionGlobals - Allow the target to completely override
105 /// section assignment of a global.
106 virtual const MCSection *
107 getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
108 SectionKind Kind) const {
112 /// getTTypeGlobalReference - Return an MCExpr to use for a reference
113 /// to the specified global variable from exception handling information.
115 virtual const MCExpr *
116 getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang,
117 MachineModuleInfo *MMI, unsigned Encoding,
118 MCStreamer &Streamer) const;
120 // getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
122 getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
123 MachineModuleInfo *MMI) const;
127 getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding,
128 MCStreamer &Streamer) const;
130 virtual const MCSection *
131 getStaticCtorSection(unsigned Priority = 65535) const {
133 return StaticCtorSection;
135 virtual const MCSection *
136 getStaticDtorSection(unsigned Priority = 65535) const {
138 return StaticDtorSection;
142 virtual const MCSection *
143 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
144 Mangler *Mang, const TargetMachine &TM) const;
147 } // end namespace llvm