#ifndef LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
#define LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/IR/Module.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/SectionKind.h"
namespace llvm {
- class MCSection;
+ class MachineModuleInfo;
+ class Mangler;
class MCContext;
+ class MCExpr;
+ class MCSection;
+ class MCSymbol;
+ class MCSymbolRefExpr;
+ class MCStreamer;
+ class ConstantExpr;
class GlobalValue;
- class Mangler;
class TargetMachine;
-
-/// SectionKind - This is a simple POD value that classifies the properties of
-/// a section. A global variable is classified into the deepest possible
-/// classification, and then the target maps them onto their sections based on
-/// what capabilities they have.
-///
-/// The comments below describe these as if they were an inheritance hierarchy
-/// in order to explain the predicates below.
-class SectionKind {
-public:
- enum Kind {
- /// Metadata - Debug info sections or other metadata.
- Metadata,
-
- /// Text - Text section, used for functions and other executable code.
- Text,
-
- /// ReadOnly - Data that is never written to at program runtime by the
- /// program or the dynamic linker. Things in the top-level readonly
- /// SectionKind are not mergeable.
- ReadOnly,
- /// MergeableCString - This is a special section for nul-terminated
- /// strings. The linker can unique the C strings, knowing their
- /// semantics. Because it uniques based on the nul terminators, the
- /// compiler can't put strings in this section that have embeded nuls
- /// in them.
- MergeableCString,
-
- /// MergeableConst - These are sections for merging fixed-length
- /// constants together. For example, this can be used to unique
- /// constant pool entries etc.
- MergeableConst,
-
- /// MergeableConst4 - This is a section used by 4-byte constants,
- /// for example, floats.
- MergeableConst4,
-
- /// MergeableConst8 - This is a section used by 8-byte constants,
- /// for example, doubles.
- MergeableConst8,
+class TargetLoweringObjectFile : public MCObjectFileInfo {
+ MCContext *Ctx;
+ const DataLayout *DL;
- /// MergeableConst16 - This is a section used by 16-byte constants,
- /// for example, vectors.
- MergeableConst16,
-
- /// Writeable - This is the base of all segments that need to be written
- /// to during program runtime.
-
- /// ThreadLocal - This is the base of all TLS segments. All TLS
- /// objects must be writeable, otherwise there is no reason for them to
- /// be thread local!
-
- /// ThreadBSS - Zero-initialized TLS data objects.
- ThreadBSS,
-
- /// ThreadData - Initialized TLS data objects.
- ThreadData,
-
- /// GlobalWriteableData - Writeable data that is global (not thread
- /// local).
-
- /// BSS - Zero initialized writeable data.
- BSS,
+ TargetLoweringObjectFile(
+ const TargetLoweringObjectFile&) LLVM_DELETED_FUNCTION;
+ void operator=(const TargetLoweringObjectFile&) LLVM_DELETED_FUNCTION;
- /// DataRel - This is the most general form of data that is written
- /// to by the program, it can have random relocations to arbitrary
- /// globals.
- DataRel,
+public:
+ MCContext &getContext() const { return *Ctx; }
- /// DataRelLocal - This is writeable data that has a non-zero
- /// initializer and has relocations in it, but all of the
- /// relocations are known to be within the final linked image
- /// the global is linked into.
- DataRelLocal,
+ TargetLoweringObjectFile() : MCObjectFileInfo(), Ctx(0), DL(0) {}
- /// DataNoRel - This is writeable data that has a non-zero
- /// initializer, but whose initializer is known to have no
- /// relocations.
- DataNoRel,
+ virtual ~TargetLoweringObjectFile();
- /// ReadOnlyWithRel - These are global variables that are never
- /// written to by the program, but that have relocations, so they
- /// must be stuck in a writeable section so that the dynamic linker
- /// can write to them. If it chooses to, the dynamic linker can
- /// mark the pages these globals end up on as read-only after it is
- /// done with its relocation phase.
- ReadOnlyWithRel,
-
- /// ReadOnlyWithRelLocal - This is data that is readonly by the
- /// program, but must be writeable so that the dynamic linker
- /// can perform relocations in it. This is used when we know
- /// that all the relocations are to globals in this final
- /// linked image.
- ReadOnlyWithRelLocal
-
- };
-
-protected:
- Kind K : 6;
-
-public:
-
- // FIXME: REMOVE.
- Kind getKind() const { return K; }
+ /// This method must be called before any actual lowering is done. This
+ /// specifies the current context for codegen, and gives the lowering
+ /// implementations a chance to set up their default sections.
+ virtual void Initialize(MCContext &ctx, const TargetMachine &TM);
- bool isMetadata() const { return K == Metadata; }
- bool isText() const { return K == Text; }
-
- bool isReadOnly() const {
- return K == ReadOnly || K == MergeableCString || isMergeableConst();
- }
+ virtual void emitPersonalityValue(MCStreamer &Streamer,
+ const TargetMachine &TM,
+ const MCSymbol *Sym) const;
- bool isMergeableCString() const { return K == MergeableCString; }
- bool isMergeableConst() const {
- return K == MergeableConst || K == MergeableConst4 ||
- K == MergeableConst8 || K == MergeableConst16;
- }
-
- bool isMergeableConst4() const { return K == MergeableConst4; }
- bool isMergeableConst8() const { return K == MergeableConst8; }
- bool isMergeableConst16() const { return K == MergeableConst16; }
-
- bool isWriteable() const {
- return isThreadLocal() || isGlobalWriteableData();
+ /// Extract the dependent library name from a linker option string. Returns
+ /// StringRef() if the option does not specify a library.
+ virtual StringRef getDepLibFromLinkerOpt(StringRef LinkerOption) const {
+ return StringRef();
}
-
- bool isThreadLocal() const {
- return K == ThreadData || K == ThreadBSS;
- }
-
- bool isThreadBSS() const { return K == ThreadBSS; }
- bool isThreadData() const { return K == ThreadData; }
- bool isGlobalWriteableData() const {
- return isBSS() || isDataRel() || isReadOnlyWithRel();
- }
-
- bool isBSS() const { return K == BSS; }
-
- bool isDataRel() const {
- return K == DataRel || K == DataRelLocal || K == DataNoRel;
- }
-
- bool isDataRelLocal() const {
- return K == DataRelLocal || K == DataNoRel;
- }
+ /// Emit the module flags that the platform cares about.
+ virtual void emitModuleFlags(MCStreamer &Streamer,
+ ArrayRef<Module::ModuleFlagEntry> Flags,
+ Mangler &Mang, const TargetMachine &TM) const {}
- bool isDataNoRel() const { return K == DataNoRel; }
-
- bool isReadOnlyWithRel() const {
- return K == ReadOnlyWithRel || K == ReadOnlyWithRelLocal;
+ /// This hook allows targets to selectively decide not to emit the
+ /// UsedDirective for some symbols in llvm.used.
+ /// FIXME: REMOVE this (rdar://7071300)
+ virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler &Mang,
+ TargetMachine &TM) const {
+ return GV != 0;
}
- bool isReadOnlyWithRelLocal() const {
- return K == ReadOnlyWithRelLocal;
- }
-
- static SectionKind get(Kind K) {
- SectionKind Res;
- Res.K = K;
- return Res;
- }
-};
+ /// Given a constant with the SectionKind, return a section that it should be
+ /// placed in.
+ virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
-
-/// SectionInfo - This class is a target-independent classification of a global
-/// which is used to simplify target-specific code by exposing common
-/// predicates.
-class SectionInfo : public SectionKind {
- /// Weak - This is true if the referenced symbol is weak (i.e. linkonce,
- /// weak, weak_odr, etc). This is orthogonal from the categorization.
- bool Weak : 1;
-
-public:
-
- /// Weak - This is true if the referenced symbol is weak (i.e. linkonce,
- /// weak, weak_odr, etc). This is orthogonal from the categorization.
- bool isWeak() const { return Weak; }
-
- static SectionInfo get(Kind K, bool isWeak = false) {
- SectionInfo Res;
- Res.K = K;
- Res.Weak = isWeak;
- return Res;
- }
- static SectionInfo get(SectionKind K, bool isWeak = false) {
- SectionInfo Res;
- *(SectionKind*)&Res = K;
- Res.Weak = isWeak;
- return Res;
- }
-};
-
-class TargetLoweringObjectFile {
- MCContext *Ctx;
-protected:
-
- TargetLoweringObjectFile();
-
- /// TextSection - Section directive for standard text.
- ///
- const MCSection *TextSection; // Defaults to ".text".
-
- /// DataSection - Section directive for standard data.
- ///
- const MCSection *DataSection; // Defaults to ".data".
-
-
-
- // FIXME: SINK THESE.
- const MCSection *BSSSection_;
+ /// Classify the specified global variable into a set of target independent
+ /// categories embodied in SectionKind.
+ static SectionKind getKindForGlobal(const GlobalValue *GV,
+ const TargetMachine &TM);
- /// ReadOnlySection - This is the directive that is emitted to switch to a
- /// read-only section for constant data (e.g. data declared const,
- /// jump tables).
- const MCSection *ReadOnlySection; // Defaults to NULL
-
- /// TLSDataSection - Section directive for Thread Local data.
- ///
- const MCSection *TLSDataSection; // Defaults to ".tdata".
-
- /// TLSBSSSection - Section directive for Thread Local uninitialized data.
- /// Null if this target doesn't support a BSS section.
- ///
- const MCSection *TLSBSSSection; // Defaults to ".tbss".
-
- const MCSection *CStringSection_;
-
-public:
- // FIXME: NONPUB.
- const MCSection *getOrCreateSection(const char *Name,
- bool isDirective,
- SectionKind K) const;
-public:
-
- virtual ~TargetLoweringObjectFile();
-
- /// Initialize - this method must be called before any actual lowering is
- /// done. This specifies the current context for codegen, and gives the
- /// lowering implementations a chance to set up their default sections.
- virtual void Initialize(MCContext &ctx, const TargetMachine &TM) {
- Ctx = &ctx;
- }
-
-
- const MCSection *getTextSection() const { return TextSection; }
- const MCSection *getDataSection() const { return DataSection; }
-
- /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
- /// decide not to emit the UsedDirective for some symbols in llvm.used.
- /// FIXME: REMOVE this (rdar://7071300)
- virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
- Mangler *) const {
- return (GV!=0);
- }
-
- /// getSectionForMergeableConstant - Given a mergeable constant with the
- /// specified size and relocation information, return a section that it
- /// should be placed in.
- virtual const MCSection *
- getSectionForMergeableConstant(SectionKind Kind) const;
-
- /// getKindForNamedSection - If this target wants to be able to override
- /// section flags based on the name of the section specified for a global
- /// variable, it can implement this. This is used on ELF systems so that
- /// ".tbss" gets the TLS bit set etc.
- virtual SectionKind getKindForNamedSection(const char *Section,
- SectionKind K) const {
- return K;
- }
-
- /// SectionForGlobal - This method computes the appropriate section to emit
- /// the specified global variable or function definition. This should not
- /// be passed external (or available externally) globals.
+ /// This method computes the appropriate section to emit the specified global
+ /// variable or function definition. This should not be passed external (or
+ /// available externally) globals.
const MCSection *SectionForGlobal(const GlobalValue *GV,
- Mangler *Mang,
+ SectionKind Kind, Mangler &Mang,
const TargetMachine &TM) const;
-
- /// getSpecialCasedSectionGlobals - Allow the target to completely override
- /// section assignment of a global.
- /// FIXME: ELIMINATE this by making PIC16 implement ADDRESS with
- /// getFlagsForNamedSection.
+
+ /// This method computes the appropriate section to emit the specified global
+ /// variable or function definition. This should not be passed external (or
+ /// available externally) globals.
+ const MCSection *SectionForGlobal(const GlobalValue *GV,
+ Mangler &Mang,
+ const TargetMachine &TM) const {
+ return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
+ }
+
+ /// Targets should implement this method to assign a section to globals with
+ /// an explicit section specfied. The implementation of this method can
+ /// assume that GV->hasSection() is true.
virtual const MCSection *
- getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
- SectionInfo Kind) const {
+ getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
+ Mangler &Mang, const TargetMachine &TM) const = 0;
+
+ /// Allow the target to completely override section assignment of a global.
+ virtual const MCSection *getSpecialCasedSectionGlobals(const GlobalValue *GV,
+ SectionKind Kind,
+ Mangler &Mang) const {
return 0;
}
-
- /// getSectionFlagsAsString - Turn the flags in the specified SectionKind
- /// into a string that can be printed to the assembly file after the
- /// ".section foo" part of a section directive.
- virtual void getSectionFlagsAsString(SectionKind Kind,
- SmallVectorImpl<char> &Str) const {
- }
-
-protected:
- virtual const MCSection *
- SelectSectionForGlobal(const GlobalValue *GV, SectionInfo Kind,
- Mangler *Mang, const TargetMachine &TM) const;
-};
-
-
-
-class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
- bool AtIsCommentChar; // True if @ is the comment character on this target.
- bool HasCrazyBSS;
-public:
- /// ELF Constructor - AtIsCommentChar is true if the CommentCharacter from TAI
- /// is "@".
- TargetLoweringObjectFileELF(bool atIsCommentChar = false,
- // FIXME: REMOVE AFTER UNIQUING IS FIXED.
- bool hasCrazyBSS = false)
- : AtIsCommentChar(atIsCommentChar), HasCrazyBSS(hasCrazyBSS) {}
-
- virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
-
-
- /// getSectionForMergeableConstant - Given a mergeable constant with the
- /// specified size and relocation information, return a section that it
- /// should be placed in.
- virtual const MCSection *
- getSectionForMergeableConstant(SectionKind Kind) const;
-
- virtual SectionKind getKindForNamedSection(const char *Section,
- SectionKind K) const;
- void getSectionFlagsAsString(SectionKind Kind,
- SmallVectorImpl<char> &Str) const;
-
- virtual const MCSection *
- SelectSectionForGlobal(const GlobalValue *GV, SectionInfo Kind,
- Mangler *Mang, const TargetMachine &TM) const;
-protected:
- const MCSection *DataRelSection;
- const MCSection *DataRelLocalSection;
- const MCSection *DataRelROSection;
- const MCSection *DataRelROLocalSection;
-
- const MCSection *MergeableConst4Section;
- const MCSection *MergeableConst8Section;
- const MCSection *MergeableConst16Section;
-};
+ /// Return an MCExpr to use for a reference to the specified global variable
+ /// from exception handling information.
+ virtual const MCExpr *
+ getTTypeGlobalReference(const GlobalValue *GV, unsigned Encoding,
+ Mangler &Mang, const TargetMachine &TM,
+ MachineModuleInfo *MMI, MCStreamer &Streamer) const;
-
-
-class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
- const MCSection *TextCoalSection;
- const MCSection *ConstTextCoalSection;
- const MCSection *ConstDataCoalSection;
- const MCSection *ConstDataSection;
- const MCSection *DataCoalSection;
- const MCSection *FourByteConstantSection;
- const MCSection *EightByteConstantSection;
- const MCSection *SixteenByteConstantSection;
-public:
-
- virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
+ /// Return the MCSymbol for a private symbol with global value name as its
+ /// base, with the specified suffix.
+ MCSymbol *getSymbolWithGlobalValueBase(const GlobalValue *GV,
+ StringRef Suffix, Mangler &Mang,
+ const TargetMachine &TM) const;
+
+ // The symbol that gets passed to .cfi_personality.
+ virtual MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV,
+ Mangler &Mang,
+ const TargetMachine &TM,
+ MachineModuleInfo *MMI) const;
+
+ const MCExpr *
+ getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding,
+ MCStreamer &Streamer) const;
virtual const MCSection *
- SelectSectionForGlobal(const GlobalValue *GV, SectionInfo Kind,
- Mangler *Mang, const TargetMachine &TM) const;
-
+ getStaticCtorSection(unsigned Priority = 65535) const {
+ (void)Priority;
+ return StaticCtorSection;
+ }
virtual const MCSection *
- getSectionForMergeableConstant(SectionKind Kind) const;
-
- /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
- /// decide not to emit the UsedDirective for some symbols in llvm.used.
- /// FIXME: REMOVE this (rdar://7071300)
- virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
- Mangler *) const;
-};
+ getStaticDtorSection(unsigned Priority = 65535) const {
+ (void)Priority;
+ return StaticDtorSection;
+ }
+ /// \brief Create a symbol reference to describe the given TLS variable when
+ /// emitting the address in debug info.
+ virtual const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const;
+ virtual const MCExpr *
+ getExecutableRelativeSymbol(const ConstantExpr *CE, Mangler &Mang,
+ const TargetMachine &TM) const {
+ return 0;
+ }
-class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
-public:
- virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
-
- virtual void getSectionFlagsAsString(SectionKind Kind,
- SmallVectorImpl<char> &Str) const;
-
+ /// \brief True if the section is atomized using the symbols in it.
+ /// This is false if the section is not atomized at all (most ELF sections) or
+ /// if it is atomized based on its contents (MachO' __TEXT,__cstring for
+ /// example).
+ virtual bool isSectionAtomizableBySymbols(const MCSection &Section) const;
+
+protected:
virtual const MCSection *
- SelectSectionForGlobal(const GlobalValue *GV, SectionInfo Kind,
- Mangler *Mang, const TargetMachine &TM) const;
+ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
+ Mangler &Mang, const TargetMachine &TM) const;
};
} // end namespace llvm
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