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;
36 class TargetLoweringObjectFile : public MCObjectFileInfo {
40 TargetLoweringObjectFile(
41 const TargetLoweringObjectFile&) LLVM_DELETED_FUNCTION;
42 void operator=(const TargetLoweringObjectFile&) LLVM_DELETED_FUNCTION;
45 MCContext &getContext() const { return *Ctx; }
47 TargetLoweringObjectFile() : MCObjectFileInfo(), Ctx(0), DL(0) {}
49 virtual ~TargetLoweringObjectFile();
51 /// Initialize - this method must be called before any actual lowering is
52 /// done. This specifies the current context for codegen, and gives the
53 /// lowering implementations a chance to set up their default sections.
54 virtual void Initialize(MCContext &ctx, const TargetMachine &TM);
56 virtual void emitPersonalityValue(MCStreamer &Streamer,
57 const TargetMachine &TM,
58 const MCSymbol *Sym) const;
60 /// emitModuleFlags - Emit the module flags that the platform cares about.
61 virtual void emitModuleFlags(MCStreamer &,
62 ArrayRef<Module::ModuleFlagEntry>,
63 Mangler *, const TargetMachine &) const {
66 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
67 /// decide not to emit the UsedDirective for some symbols in llvm.used.
68 /// FIXME: REMOVE this (rdar://7071300)
69 virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
74 /// getSectionForConstant - Given a constant with the SectionKind, return a
75 /// section that it should be placed in.
76 virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
78 /// getKindForGlobal - Classify the specified global variable into a set of
79 /// target independent categories embodied in SectionKind.
80 static SectionKind getKindForGlobal(const GlobalValue *GV,
81 const TargetMachine &TM);
83 /// SectionForGlobal - This method computes the appropriate section to emit
84 /// the specified global variable or function definition. This should not
85 /// be passed external (or available externally) globals.
86 const MCSection *SectionForGlobal(const GlobalValue *GV,
87 SectionKind Kind, Mangler *Mang,
88 const TargetMachine &TM) const;
90 /// SectionForGlobal - This method computes the appropriate section to emit
91 /// the specified global variable or function definition. This should not
92 /// be passed external (or available externally) globals.
93 const MCSection *SectionForGlobal(const GlobalValue *GV,
95 const TargetMachine &TM) const {
96 return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
99 /// getExplicitSectionGlobal - Targets should implement this method to assign
100 /// a section to globals with an explicit section specfied. The
101 /// implementation of this method can assume that GV->hasSection() is true.
102 virtual const MCSection *
103 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
104 Mangler *Mang, const TargetMachine &TM) const = 0;
106 /// getSpecialCasedSectionGlobals - Allow the target to completely override
107 /// section assignment of a global.
108 virtual const MCSection *
109 getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
110 SectionKind Kind) const {
114 /// getTTypeGlobalReference - Return an MCExpr to use for a reference
115 /// to the specified global variable from exception handling information.
117 virtual const MCExpr *
118 getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang,
119 MachineModuleInfo *MMI, unsigned Encoding,
120 MCStreamer &Streamer) const;
122 /// Return the MCSymbol for the specified global value. This symbol is the
123 /// main label that is the address of the global
124 MCSymbol *getSymbol(Mangler &M, const GlobalValue *GV) const;
126 /// Return the MCSymbol for a private symbol with global value name as its
127 /// base, with the specified suffix.
128 MCSymbol *getSymbolWithGlobalValueBase(Mangler &M, const GlobalValue *GV,
129 StringRef Suffix) const;
131 // getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
133 getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
134 MachineModuleInfo *MMI) const;
138 getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding,
139 MCStreamer &Streamer) const;
141 virtual const MCSection *
142 getStaticCtorSection(unsigned Priority = 65535) const {
144 return StaticCtorSection;
146 virtual const MCSection *
147 getStaticDtorSection(unsigned Priority = 65535) const {
149 return StaticDtorSection;
152 /// \brief Create a symbol reference to describe the given TLS variable when
153 /// emitting the address in debug info.
154 virtual const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const;
156 virtual const MCExpr *
157 getExecutableRelativeSymbol(const ConstantExpr *CE, Mangler *Mang) const {
162 virtual const MCSection *
163 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
164 Mangler *Mang, const TargetMachine &TM) const;
167 } // end namespace llvm