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538dfe3e23
Implement options in clang to enable recording the driver command-line in an ELF section. Implement a new special named metadata, llvm.commandline, to support frontends embedding their command-line options in IR/ASM/ELF. This differs from the GCC implementation in some key ways: * In GCC there is only one command-line possible per compilation-unit, in LLVM it mirrors llvm.ident and multiple are allowed. * In GCC individual options are separated by NULL bytes, in LLVM entire command-lines are separated by NULL bytes. The advantage of the GCC approach is to clearly delineate options in the face of embedded spaces. The advantage of the LLVM approach is to support merging multiple command-lines unambiguously, while handling embedded spaces with escaping. Differential Revision: https://reviews.llvm.org/D54487 Clang Differential Revision: https://reviews.llvm.org/D54489 llvm-svn: 349155
213 lines
8.9 KiB
C++
213 lines
8.9 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/IR/Module.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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namespace llvm {
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class GlobalValue;
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class MachineModuleInfo;
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class Mangler;
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class MCContext;
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class MCSection;
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class MCSymbol;
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class TargetMachine;
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class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
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bool UseInitArray = false;
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mutable unsigned NextUniqueID = 1; // ID 0 is reserved for execute-only sections
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protected:
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MCSymbolRefExpr::VariantKind PLTRelativeVariantKind =
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MCSymbolRefExpr::VK_None;
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const TargetMachine *TM;
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public:
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TargetLoweringObjectFileELF() = default;
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~TargetLoweringObjectFileELF() override = default;
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void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
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/// Emit Obj-C garbage collection and linker options.
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void emitModuleMetadata(MCStreamer &Streamer, Module &M) const override;
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void emitPersonalityValue(MCStreamer &Streamer, const DataLayout &DL,
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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(const DataLayout &DL, SectionKind Kind,
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const Constant *C,
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unsigned &Align) const override;
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MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
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const TargetMachine &TM) const override;
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MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
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const TargetMachine &TM) const override;
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MCSection *getSectionForJumpTable(const Function &F,
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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 *getTTypeGlobalReference(const GlobalValue *GV,
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unsigned Encoding,
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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,
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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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const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
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const GlobalValue *RHS,
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const TargetMachine &TM) const override;
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MCSection *getSectionForCommandLines() const override;
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};
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class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
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public:
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TargetLoweringObjectFileMachO();
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~TargetLoweringObjectFileMachO() override = default;
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void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
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/// Emit the module flags that specify the garbage collection information.
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void emitModuleMetadata(MCStreamer &Streamer, Module &M) const override;
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MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
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const TargetMachine &TM) const override;
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MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
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const TargetMachine &TM) const override;
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MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
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const Constant *C,
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unsigned &Align) 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 *getTTypeGlobalReference(const GlobalValue *GV,
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unsigned Encoding,
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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,
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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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void getNameWithPrefix(SmallVectorImpl<char> &OutName, const GlobalValue *GV,
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const TargetMachine &TM) const override;
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};
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class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
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mutable unsigned NextUniqueID = 0;
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public:
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~TargetLoweringObjectFileCOFF() override = default;
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void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
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MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
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const TargetMachine &TM) const override;
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MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
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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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const TargetMachine &TM) const override;
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MCSection *getSectionForJumpTable(const Function &F,
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const TargetMachine &TM) const override;
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/// Emit Obj-C garbage collection and linker options.
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void emitModuleMetadata(MCStreamer &Streamer, Module &M) 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,
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const GlobalValue *GV) const override;
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void emitLinkerFlagsForUsed(raw_ostream &OS,
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const GlobalValue *GV) const override;
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const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
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const GlobalValue *RHS,
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const TargetMachine &TM) const override;
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/// Given a mergeable constant with the specified size and relocation
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/// information, return a section that it should be placed in.
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MCSection *getSectionForConstant(const DataLayout &DL, SectionKind Kind,
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const Constant *C,
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unsigned &Align) const override;
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};
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class TargetLoweringObjectFileWasm : public TargetLoweringObjectFile {
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mutable unsigned NextUniqueID = 0;
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public:
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TargetLoweringObjectFileWasm() = default;
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~TargetLoweringObjectFileWasm() override = default;
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MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
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const TargetMachine &TM) const override;
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MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
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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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void InitializeWasm();
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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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const MCExpr *lowerRelativeReference(const GlobalValue *LHS,
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const GlobalValue *RHS,
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const TargetMachine &TM) const override;
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};
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} // end namespace llvm
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#endif // LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
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