llvm-6502/include/llvm/MC/MCObjectFileInfo.h
Tim Northover bc702ae152 MC-exceptions: add support for compact-unwind without .eh_frame
ARM64 has compact-unwind information, but doesn't necessarily want to
emit .eh_frame directives as well. This teaches MC about such a
situation so that it will skip .eh_frame info when compact unwind has
been successfully produced.

For functions incompatible with compact unwind, the normal information
is still written.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205087 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-29 09:03:13 +00:00

399 lines
14 KiB
C++

//===-- llvm/MC/MCObjectFileInfo.h - Object File Info -----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file describes common object file formats.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCBJECTFILEINFO_H
#define LLVM_MC_MCBJECTFILEINFO_H
#include "llvm/Support/CodeGen.h"
namespace llvm {
class MCContext;
class MCSection;
class StringRef;
class Triple;
class MCObjectFileInfo {
protected:
/// CommDirectiveSupportsAlignment - True if .comm supports alignment. This
/// is a hack for as long as we support 10.4 Tiger, whose assembler doesn't
/// support alignment on comm.
bool CommDirectiveSupportsAlignment;
/// SupportsWeakEmptyEHFrame - True if target object file supports a
/// weak_definition of constant 0 for an omitted EH frame.
bool SupportsWeakOmittedEHFrame;
/// IsFunctionEHFrameSymbolPrivate - This flag is set to true if the
/// "EH_frame" symbol for EH information should be an assembler temporary (aka
/// private linkage, aka an L or .L label) or false if it should be a normal
/// non-.globl label. This defaults to true.
bool IsFunctionEHFrameSymbolPrivate;
/// SupportsCompactUnwindWithoutEHFrame - True if the target object file
/// supports emitting a compact unwind section without an associated EH frame
/// section.
bool SupportsCompactUnwindWithoutEHFrame;
/// PersonalityEncoding, LSDAEncoding, FDEEncoding, TTypeEncoding - Some
/// encoding values for EH.
unsigned PersonalityEncoding;
unsigned LSDAEncoding;
unsigned FDEEncoding;
unsigned FDECFIEncoding;
unsigned TTypeEncoding;
/// Section flags for eh_frame
unsigned EHSectionType;
unsigned EHSectionFlags;
/// CompactUnwindDwarfEHFrameOnly - Compact unwind encoding indicating that we
/// should emit only an EH frame.
unsigned CompactUnwindDwarfEHFrameOnly;
/// TextSection - Section directive for standard text.
///
const MCSection *TextSection;
/// DataSection - Section directive for standard 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;
/// StaticCtorSection - This section contains the static constructor pointer
/// list.
const MCSection *StaticCtorSection;
/// 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;
/// CompactUnwindSection - If exception handling is supported by the target
/// and the target can support a compact representation of the CIE and FDE,
/// this is the section to emit them into.
const MCSection *CompactUnwindSection;
// 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 *DwarfPubTypesSection;
const MCSection *DwarfDebugInlineSection;
const MCSection *DwarfStrSection;
const MCSection *DwarfLocSection;
const MCSection *DwarfARangesSection;
const MCSection *DwarfRangesSection;
const MCSection *DwarfMacroInfoSection;
// The pubnames section is no longer generated by default. The generation
// can be enabled by a compiler flag.
const MCSection *DwarfPubNamesSection;
// DWARF5 Experimental Debug Info Sections
/// DwarfAccelNamesSection, DwarfAccelObjCSection,
/// DwarfAccelNamespaceSection, DwarfAccelTypesSection -
/// If we use the DWARF accelerated hash tables then we want to emit these
/// sections.
const MCSection *DwarfAccelNamesSection;
const MCSection *DwarfAccelObjCSection;
const MCSection *DwarfAccelNamespaceSection;
const MCSection *DwarfAccelTypesSection;
/// These are used for the Fission separate debug information files.
const MCSection *DwarfInfoDWOSection;
const MCSection *DwarfAbbrevDWOSection;
const MCSection *DwarfStrDWOSection;
const MCSection *DwarfLineDWOSection;
const MCSection *DwarfLocDWOSection;
const MCSection *DwarfStrOffDWOSection;
const MCSection *DwarfAddrSection;
/// Sections for newer gnu pubnames and pubtypes.
const MCSection *DwarfGnuPubNamesSection;
const MCSection *DwarfGnuPubTypesSection;
const MCSection *COFFDebugSymbolsSection;
// Extra TLS Variable Data section. If the target needs to put additional
// information for a TLS variable, it'll go here.
const MCSection *TLSExtraDataSection;
/// TLSDataSection - Section directive for Thread Local data.
/// ELF, MachO and COFF.
const MCSection *TLSDataSection; // Defaults to ".tdata".
/// TLSBSSSection - Section directive for Thread Local uninitialized data.
/// Null if this target doesn't support a BSS section.
/// ELF and MachO only.
const MCSection *TLSBSSSection; // Defaults to ".tbss".
/// StackMap section.
const MCSection *StackMapSection;
/// EHFrameSection - EH frame section. It is initialized on demand so it
/// can be overwritten (with uniquing).
const MCSection *EHFrameSection;
/// ELF specific sections.
///
const MCSection *DataRelSection;
const MCSection *DataRelLocalSection;
const MCSection *DataRelROSection;
const MCSection *DataRelROLocalSection;
const MCSection *MergeableConst4Section;
const MCSection *MergeableConst8Section;
const MCSection *MergeableConst16Section;
/// MachO specific sections.
///
/// TLSTLVSection - Section for thread local structure information.
/// Contains the source code name of the variable, visibility and a pointer
/// to the initial value (.tdata or .tbss).
const MCSection *TLSTLVSection; // Defaults to ".tlv".
/// TLSThreadInitSection - Section for thread local data initialization
/// functions.
const MCSection *TLSThreadInitSection; // Defaults to ".thread_init_func".
const MCSection *CStringSection;
const MCSection *UStringSection;
const MCSection *TextCoalSection;
const MCSection *ConstTextCoalSection;
const MCSection *ConstDataSection;
const MCSection *DataCoalSection;
const MCSection *DataCommonSection;
const MCSection *DataBSSSection;
const MCSection *FourByteConstantSection;
const MCSection *EightByteConstantSection;
const MCSection *SixteenByteConstantSection;
const MCSection *LazySymbolPointerSection;
const MCSection *NonLazySymbolPointerSection;
/// COFF specific sections.
///
const MCSection *DrectveSection;
const MCSection *PDataSection;
const MCSection *XDataSection;
public:
void InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, CodeModel::Model CM,
MCContext &ctx);
bool isFunctionEHFrameSymbolPrivate() const {
return IsFunctionEHFrameSymbolPrivate;
}
bool getSupportsWeakOmittedEHFrame() const {
return SupportsWeakOmittedEHFrame;
}
bool getSupportsCompactUnwindWithoutEHFrame() const {
return SupportsCompactUnwindWithoutEHFrame;
}
bool getCommDirectiveSupportsAlignment() const {
return CommDirectiveSupportsAlignment;
}
unsigned getPersonalityEncoding() const { return PersonalityEncoding; }
unsigned getLSDAEncoding() const { return LSDAEncoding; }
unsigned getFDEEncoding(bool CFI) const {
return CFI ? FDECFIEncoding : FDEEncoding;
}
unsigned getTTypeEncoding() const { return TTypeEncoding; }
unsigned getCompactUnwindDwarfEHFrameOnly() const {
return CompactUnwindDwarfEHFrameOnly;
}
const MCSection *getTextSection() const { return TextSection; }
const MCSection *getDataSection() const { return DataSection; }
const MCSection *getBSSSection() const { return BSSSection; }
const MCSection *getLSDASection() const { return LSDASection; }
const MCSection *getCompactUnwindSection() const{
return CompactUnwindSection;
}
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 *getDwarfGnuPubNamesSection() const {
return DwarfGnuPubNamesSection;
}
const MCSection *getDwarfGnuPubTypesSection() const {
return DwarfGnuPubTypesSection;
}
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;
}
// DWARF5 Experimental Debug Info Sections
const MCSection *getDwarfAccelNamesSection() const {
return DwarfAccelNamesSection;
}
const MCSection *getDwarfAccelObjCSection() const {
return DwarfAccelObjCSection;
}
const MCSection *getDwarfAccelNamespaceSection() const {
return DwarfAccelNamespaceSection;
}
const MCSection *getDwarfAccelTypesSection() const {
return DwarfAccelTypesSection;
}
const MCSection *getDwarfInfoDWOSection() const {
return DwarfInfoDWOSection;
}
const MCSection *getDwarfTypesSection(uint64_t Hash) const;
const MCSection *getDwarfTypesDWOSection(uint64_t Hash) const;
const MCSection *getDwarfAbbrevDWOSection() const {
return DwarfAbbrevDWOSection;
}
const MCSection *getDwarfStrDWOSection() const {
return DwarfStrDWOSection;
}
const MCSection *getDwarfLineDWOSection() const {
return DwarfLineDWOSection;
}
const MCSection *getDwarfLocDWOSection() const {
return DwarfLocDWOSection;
}
const MCSection *getDwarfStrOffDWOSection() const {
return DwarfStrOffDWOSection;
}
const MCSection *getDwarfAddrSection() const {
return DwarfAddrSection;
}
const MCSection *getCOFFDebugSymbolsSection() const {
return COFFDebugSymbolsSection;
}
const MCSection *getTLSExtraDataSection() const {
return TLSExtraDataSection;
}
const MCSection *getTLSDataSection() const { return TLSDataSection; }
const MCSection *getTLSBSSSection() const { return TLSBSSSection; }
const MCSection *getStackMapSection() const { return StackMapSection; }
/// ELF specific sections.
///
const MCSection *getDataRelSection() const { return DataRelSection; }
const MCSection *getDataRelLocalSection() const {
return DataRelLocalSection;
}
const MCSection *getDataRelROSection() const { return DataRelROSection; }
const MCSection *getDataRelROLocalSection() const {
return DataRelROLocalSection;
}
const MCSection *getMergeableConst4Section() const {
return MergeableConst4Section;
}
const MCSection *getMergeableConst8Section() const {
return MergeableConst8Section;
}
const MCSection *getMergeableConst16Section() const {
return MergeableConst16Section;
}
/// MachO specific sections.
///
const MCSection *getTLSTLVSection() const { return TLSTLVSection; }
const MCSection *getTLSThreadInitSection() const {
return TLSThreadInitSection;
}
const MCSection *getCStringSection() const { return CStringSection; }
const MCSection *getUStringSection() const { return UStringSection; }
const MCSection *getTextCoalSection() const { return TextCoalSection; }
const MCSection *getConstTextCoalSection() const {
return ConstTextCoalSection;
}
const MCSection *getConstDataSection() const { return ConstDataSection; }
const MCSection *getDataCoalSection() const { return DataCoalSection; }
const MCSection *getDataCommonSection() const { return DataCommonSection; }
const MCSection *getDataBSSSection() const { return DataBSSSection; }
const MCSection *getFourByteConstantSection() const {
return FourByteConstantSection;
}
const MCSection *getEightByteConstantSection() const {
return EightByteConstantSection;
}
const MCSection *getSixteenByteConstantSection() const {
return SixteenByteConstantSection;
}
const MCSection *getLazySymbolPointerSection() const {
return LazySymbolPointerSection;
}
const MCSection *getNonLazySymbolPointerSection() const {
return NonLazySymbolPointerSection;
}
/// COFF specific sections.
///
const MCSection *getDrectveSection() const { return DrectveSection; }
const MCSection *getPDataSection() const { return PDataSection; }
const MCSection *getXDataSection() const { return XDataSection; }
const MCSection *getEHFrameSection() {
if (!EHFrameSection)
InitEHFrameSection();
return EHFrameSection;
}
enum Environment { IsMachO, IsELF, IsCOFF };
Environment getObjectFileType() const {
return Env;
}
Reloc::Model getRelocM() const {
return RelocM;
}
private:
Environment Env;
Reloc::Model RelocM;
CodeModel::Model CMModel;
MCContext *Ctx;
void InitMachOMCObjectFileInfo(Triple T);
void InitELFMCObjectFileInfo(Triple T);
void InitCOFFMCObjectFileInfo(Triple T);
/// InitEHFrameSection - Initialize EHFrameSection on demand.
///
void InitEHFrameSection();
};
} // end namespace llvm
#endif