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a6367d9136
This change unifies how LTOModule and the backend obtain linker flags for globals: via a new TargetLoweringObjectFile member function named emitLinkerFlagsForGlobal. A new function LTOModule::getLinkerOpts() returns the list of linker flags as a single concatenated string. This change affects the C libLTO API: the function lto_module_get_*deplibs now exposes an empty list, and lto_module_get_*linkeropts exposes a single element which combines the contents of all observed flags. libLTO should never have tried to parse the linker flags; it is the linker's job to do so. Because linkers will need to be able to parse flags in regular object files, it makes little sense for libLTO to have a redundant mechanism for doing so. The new API is compatible with the old one. It is valid for a user to specify multiple linker flags in a single pragma directive like this: #pragma comment(linker, "/defaultlib:foo /defaultlib:bar") The previous implementation would not have exposed either flag via lto_module_get_*deplibs (as the test in TargetLoweringObjectFileCOFF::getDepLibFromLinkerOpt was case sensitive) and would have exposed "/defaultlib:foo /defaultlib:bar" as a single flag via lto_module_get_*linkeropts. This may have been a bug in the implementation, but it does give us a chance to fix the interface. Differential Revision: http://reviews.llvm.org/D10548 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241010 91177308-0d34-0410-b5e6-96231b3b80d8
167 lines
6.7 KiB
C++
167 lines
6.7 KiB
C++
//==-- llvm/CodeGen/TargetLoweringObjectFileImpl.h - Object Info -*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements classes used to handle lowerings specific to common
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// object file formats.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
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#define LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/MC/SectionKind.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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namespace llvm {
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class MachineModuleInfo;
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class Mangler;
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class MCAsmInfo;
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class MCExpr;
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class MCSection;
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class MCSectionMachO;
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class MCSymbol;
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class MCContext;
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class GlobalValue;
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class TargetMachine;
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class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
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bool UseInitArray;
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mutable unsigned NextUniqueID = 0;
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public:
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TargetLoweringObjectFileELF() : UseInitArray(false) {}
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~TargetLoweringObjectFileELF() override {}
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void emitPersonalityValue(MCStreamer &Streamer, const TargetMachine &TM,
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const MCSymbol *Sym) const override;
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/// Given a constant with the SectionKind, return a section that it should be
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/// placed in.
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MCSection *getSectionForConstant(SectionKind Kind,
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const Constant *C) const override;
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MCSection *getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler &Mang,
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const TargetMachine &TM) const override;
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MCSection *SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler &Mang,
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const TargetMachine &TM) const override;
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MCSection *getSectionForJumpTable(const Function &F, Mangler &Mang,
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const TargetMachine &TM) const override;
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bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference,
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const Function &F) const override;
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/// Return an MCExpr to use for a reference to the specified type info global
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/// variable from exception handling information.
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const MCExpr *
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getTTypeGlobalReference(const GlobalValue *GV, unsigned Encoding,
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Mangler &Mang, const TargetMachine &TM,
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MachineModuleInfo *MMI,
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MCStreamer &Streamer) const override;
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// The symbol that gets passed to .cfi_personality.
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MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV, Mangler &Mang,
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const TargetMachine &TM,
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MachineModuleInfo *MMI) const override;
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void InitializeELF(bool UseInitArray_);
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MCSection *getStaticCtorSection(unsigned Priority,
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const MCSymbol *KeySym) const override;
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MCSection *getStaticDtorSection(unsigned Priority,
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const MCSymbol *KeySym) const override;
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};
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class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
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public:
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~TargetLoweringObjectFileMachO() override {}
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TargetLoweringObjectFileMachO();
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/// Emit the module flags that specify the garbage collection information.
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void emitModuleFlags(MCStreamer &Streamer,
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ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
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Mangler &Mang, const TargetMachine &TM) const override;
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MCSection *SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler &Mang,
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const TargetMachine &TM) const override;
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MCSection *getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler &Mang,
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const TargetMachine &TM) const override;
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MCSection *getSectionForConstant(SectionKind Kind,
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const Constant *C) const override;
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/// The mach-o version of this method defaults to returning a stub reference.
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const MCExpr *
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getTTypeGlobalReference(const GlobalValue *GV, unsigned Encoding,
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Mangler &Mang, const TargetMachine &TM,
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MachineModuleInfo *MMI,
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MCStreamer &Streamer) const override;
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// The symbol that gets passed to .cfi_personality.
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MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV, Mangler &Mang,
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const TargetMachine &TM,
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MachineModuleInfo *MMI) const override;
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/// Get MachO PC relative GOT entry relocation
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const MCExpr *getIndirectSymViaGOTPCRel(const MCSymbol *Sym,
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const MCValue &MV, int64_t Offset,
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MachineModuleInfo *MMI,
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MCStreamer &Streamer) const override;
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};
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class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
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public:
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~TargetLoweringObjectFileCOFF() override {}
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MCSection *getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler &Mang,
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const TargetMachine &TM) const override;
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MCSection *SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler &Mang,
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const TargetMachine &TM) const override;
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void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV,
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bool CannotUsePrivateLabel, Mangler &Mang,
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const TargetMachine &TM) const override;
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MCSection *getSectionForJumpTable(const Function &F, Mangler &Mang,
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const TargetMachine &TM) const override;
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/// Emit Obj-C garbage collection and linker options. Only linker option
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/// emission is implemented for COFF.
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void emitModuleFlags(MCStreamer &Streamer,
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ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
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Mangler &Mang, const TargetMachine &TM) const override;
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MCSection *getStaticCtorSection(unsigned Priority,
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const MCSymbol *KeySym) const override;
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MCSection *getStaticDtorSection(unsigned Priority,
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const MCSymbol *KeySym) const override;
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void emitLinkerFlagsForGlobal(raw_ostream &OS, const GlobalValue *GV,
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const Mangler &Mang) const override;
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};
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} // end namespace llvm
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#endif
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