#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
+#include "llvm/MC/SectionKind.h"
namespace llvm {
class MCSection;
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,
-
- /// 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,
-
- /// 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,
-
- /// 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,
-
- /// DataNoRel - This is writeable data that has a non-zero
- /// initializer, but whose initializer is known to have no
- /// relocations.
- DataNoRel,
-
- /// 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; }
-
- bool isMetadata() const { return K == Metadata; }
- bool isText() const { return K == Text; }
-
- bool isReadOnly() const {
- return K == ReadOnly || K == MergeableCString || isMergeableConst();
- }
-
- 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();
- }
-
- 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;
- }
-
- bool isDataNoRel() const { return K == DataNoRel; }
-
- bool isReadOnlyWithRel() const {
- return K == ReadOnlyWithRel || K == ReadOnlyWithRelLocal;
- }
-
- bool isReadOnlyWithRelLocal() const {
- return K == ReadOnlyWithRelLocal;
- }
-
- static SectionKind get(Kind K) {
- SectionKind Res;
- Res.K = K;
- return Res;
- }
-};
-
-
-/// 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:
/// TextSection - Section directive for standard text.
///
- const MCSection *TextSection; // Defaults to ".text".
+ const MCSection *TextSection;
/// DataSection - Section directive for standard data.
///
- const MCSection *DataSection; // Defaults to ".data".
+ const MCSection *DataSection;
+ /// BSSSection - Section that is default initialized to zero.
+ const MCSection *BSSSection;
+ /// ReadOnlySection - Section that is readonly and can contain arbitrary
+ /// initialized data. Targets are not required to have a readonly section.
+ /// If they don't, various bits of code will fall back to using the data
+ /// section for constants.
+ const MCSection *ReadOnlySection;
- // FIXME: SINK THESE.
- const MCSection *BSSSection_;
+ /// StaticCtorSection - This section contains the static constructor pointer
+ /// list.
+ const MCSection *StaticCtorSection;
- /// 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".
+ /// StaticDtorSection - This section contains the static destructor pointer
+ /// list.
+ const MCSection *StaticDtorSection;
+
+ /// LSDASection - If exception handling is supported by the target, this is
+ /// the section the Language Specific Data Area information is emitted to.
+ const MCSection *LSDASection;
+
+ /// EHFrameSection - If exception handling is supported by the target, this is
+ /// the section the EH Frame is emitted to.
+ const MCSection *EHFrameSection;
+
+ // Dwarf sections for debug info. If a target supports debug info, these must
+ // be set.
+ const MCSection *DwarfAbbrevSection;
+ const MCSection *DwarfInfoSection;
+ const MCSection *DwarfLineSection;
+ const MCSection *DwarfFrameSection;
+ const MCSection *DwarfPubNamesSection;
+ const MCSection *DwarfPubTypesSection;
+ const MCSection *DwarfDebugInlineSection;
+ const MCSection *DwarfStrSection;
+ const MCSection *DwarfLocSection;
+ const MCSection *DwarfARangesSection;
+ const MCSection *DwarfRangesSection;
+ const MCSection *DwarfMacroInfoSection;
- const MCSection *CStringSection_;
-
-public:
- // FIXME: NONPUB.
- const MCSection *getOrCreateSection(const char *Name,
- bool isDirective,
- SectionKind K) const;
public:
+ MCContext &getContext() const { return *Ctx; }
+
+
virtual ~TargetLoweringObjectFile();
/// Initialize - this method must be called before any actual lowering is
const MCSection *getTextSection() const { return TextSection; }
const MCSection *getDataSection() const { return DataSection; }
+ const MCSection *getStaticCtorSection() const { return StaticCtorSection; }
+ const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
+ const MCSection *getLSDASection() const { return LSDASection; }
+ const MCSection *getEHFrameSection() const { return EHFrameSection; }
+ const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
+ const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
+ const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
+ const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
+ const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;}
+ const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
+ const MCSection *getDwarfDebugInlineSection() const {
+ return DwarfDebugInlineSection;
+ }
+ const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
+ const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
+ const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
+ const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
+ const MCSection *getDwarfMacroInfoSection() const {
+ return DwarfMacroInfoSection;
+ }
/// 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);
+ 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;
- }
+ /// getSectionForConstant - Given a constant with the SectionKind, return a
+ /// section that it should be placed in.
+ virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
+
+ /// getKindForGlobal - Classify the specified global variable into a set of
+ /// target independent categories embodied in SectionKind.
+ static SectionKind getKindForGlobal(const GlobalValue *GV,
+ const TargetMachine &TM);
/// 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.
const MCSection *SectionForGlobal(const GlobalValue *GV,
- Mangler *Mang,
+ SectionKind Kind, Mangler *Mang,
const TargetMachine &TM) const;
+ /// 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.
+ const MCSection *SectionForGlobal(const GlobalValue *GV,
+ Mangler *Mang,
+ const TargetMachine &TM) const {
+ return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
+ }
+
+
+
+ /// getExplicitSectionGlobal - 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 *
+ getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
+ Mangler *Mang, const TargetMachine &TM) const = 0;
+
/// getSpecialCasedSectionGlobals - Allow the target to completely override
/// section assignment of a global.
- /// FIXME: ELIMINATE this by making PIC16 implement ADDRESS with
- /// getFlagsForNamedSection.
virtual const MCSection *
getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
- SectionInfo Kind) const {
+ SectionKind Kind) const {
return 0;
}
protected:
virtual const MCSection *
- SelectSectionForGlobal(const GlobalValue *GV, SectionInfo Kind,
+ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
};
class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
bool AtIsCommentChar; // True if @ is the comment character on this target.
bool HasCrazyBSS;
+protected:
+ /// 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 *DataRelSection;
+ const MCSection *DataRelLocalSection;
+ const MCSection *DataRelROSection;
+ const MCSection *DataRelROLocalSection;
+
+ const MCSection *MergeableConst4Section;
+ const MCSection *MergeableConst8Section;
+ const MCSection *MergeableConst16Section;
+
+protected:
+ const MCSection *getELFSection(const char *Name, bool isDirective,
+ SectionKind Kind) const;
public:
/// ELF Constructor - AtIsCommentChar is true if the CommentCharacter from TAI
/// is "@".
// FIXME: REMOVE AFTER UNIQUING IS FIXED.
bool hasCrazyBSS = false)
: AtIsCommentChar(atIsCommentChar), HasCrazyBSS(hasCrazyBSS) {}
-
+
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
+ /// getSectionForConstant - Given a constant with the SectionKind, return a
+ /// section that it should be placed in.
+ virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
+
- /// 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;
+ getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
+ Mangler *Mang, const TargetMachine &TM) 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,
+ SelectSectionForGlobal(const GlobalValue *GV, SectionKind 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;
};
class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
+ const MCSection *CStringSection;
+ const MCSection *UStringSection;
const MCSection *TextCoalSection;
const MCSection *ConstTextCoalSection;
const MCSection *ConstDataCoalSection;
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
virtual const MCSection *
- SelectSectionForGlobal(const GlobalValue *GV, SectionInfo Kind,
+ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
virtual const MCSection *
- getSectionForMergeableConstant(SectionKind Kind) const;
+ getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
+ Mangler *Mang, const TargetMachine &TM) const;
+
+ virtual const MCSection *getSectionForConstant(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;
+
+ /// getMachOSection - Return the MCSection for the specified mach-o section.
+ /// FIXME: Switch this to a semantic view eventually.
+ const MCSection *getMachOSection(const char *Name, bool isDirective,
+ SectionKind K) const;
};
public:
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
+ virtual const MCSection *
+ getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
+ Mangler *Mang, const TargetMachine &TM) const;
+
virtual void getSectionFlagsAsString(SectionKind Kind,
SmallVectorImpl<char> &Str) const;
virtual const MCSection *
- SelectSectionForGlobal(const GlobalValue *GV, SectionInfo Kind,
+ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
+
+ /// getCOFFSection - Return the MCSection for the specified COFF section.
+ /// FIXME: Switch this to a semantic view eventually.
+ const MCSection *getCOFFSection(const char *Name, bool isDirective,
+ SectionKind K) const;
};
} // end namespace llvm
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