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//===-- llvm/MC/MCObjectFileInfo.h - Object File Info -----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file describes common object file formats.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCOBJECTFILEINFO_H
#define LLVM_MC_MCOBJECTFILEINFO_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/VersionTuple.h"
namespace llvm {
class MCContext;
class MCSection;
class MCObjectFileInfo {
protected:
/// 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 = false;
/// True if target object file supports a weak_definition of constant 0 for an
/// omitted EH frame.
bool SupportsWeakOmittedEHFrame = false;
/// True if the target object file supports emitting a compact unwind section
/// without an associated EH frame section.
bool SupportsCompactUnwindWithoutEHFrame = false;
/// OmitDwarfIfHaveCompactUnwind - True if the target object file
/// supports having some functions with compact unwind and other with
/// dwarf unwind.
bool OmitDwarfIfHaveCompactUnwind = false;
/// FDE CFI encoding. Controls the encoding of the begin label in the
/// .eh_frame section. Unlike the LSDA encoding, personality encoding, and
/// type encodings, this is something that the assembler just "knows" about
/// its target
unsigned FDECFIEncoding = 0;
/// Compact unwind encoding indicating that we should emit only an EH frame.
unsigned CompactUnwindDwarfEHFrameOnly = 0;
/// Section directive for standard text.
MCSection *TextSection = nullptr;
/// Section directive for standard data.
MCSection *DataSection = nullptr;
/// Section that is default initialized to zero.
MCSection *BSSSection = nullptr;
/// 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.
MCSection *ReadOnlySection = nullptr;
/// If exception handling is supported by the target, this is the section the
/// Language Specific Data Area information is emitted to.
MCSection *LSDASection = nullptr;
/// 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.
MCSection *CompactUnwindSection = nullptr;
// Dwarf sections for debug info. If a target supports debug info, these must
// be set.
MCSection *DwarfAbbrevSection = nullptr;
MCSection *DwarfInfoSection = nullptr;
MCSection *DwarfLineSection = nullptr;
MCSection *DwarfLineStrSection = nullptr;
MCSection *DwarfFrameSection = nullptr;
MCSection *DwarfPubTypesSection = nullptr;
const MCSection *DwarfDebugInlineSection = nullptr;
MCSection *DwarfStrSection = nullptr;
MCSection *DwarfLocSection = nullptr;
MCSection *DwarfARangesSection = nullptr;
MCSection *DwarfRangesSection = nullptr;
MCSection *DwarfMacinfoSection = nullptr;
// The pubnames section is no longer generated by default. The generation
// can be enabled by a compiler flag.
MCSection *DwarfPubNamesSection = nullptr;
/// Accelerator table sections. DwarfDebugNamesSection is the DWARF v5
/// accelerator table, while DwarfAccelNamesSection, DwarfAccelObjCSection,
/// DwarfAccelNamespaceSection, DwarfAccelTypesSection are pre-DWARF v5
/// extensions.
MCSection *DwarfDebugNamesSection = nullptr;
MCSection *DwarfAccelNamesSection = nullptr;
MCSection *DwarfAccelObjCSection = nullptr;
MCSection *DwarfAccelNamespaceSection = nullptr;
MCSection *DwarfAccelTypesSection = nullptr;
// These are used for the Fission separate debug information files.
MCSection *DwarfInfoDWOSection = nullptr;
MCSection *DwarfTypesDWOSection = nullptr;
MCSection *DwarfAbbrevDWOSection = nullptr;
MCSection *DwarfStrDWOSection = nullptr;
MCSection *DwarfLineDWOSection = nullptr;
MCSection *DwarfLocDWOSection = nullptr;
MCSection *DwarfStrOffDWOSection = nullptr;
MCSection *DwarfMacinfoDWOSection = nullptr;
/// The DWARF v5 string offset and address table sections.
MCSection *DwarfStrOffSection = nullptr;
MCSection *DwarfAddrSection = nullptr;
/// The DWARF v5 range list section.
MCSection *DwarfRnglistsSection = nullptr;
/// The DWARF v5 locations list section.
MCSection *DwarfLoclistsSection = nullptr;
/// The DWARF v5 range and location list sections for fission.
MCSection *DwarfRnglistsDWOSection = nullptr;
MCSection *DwarfLoclistsDWOSection = nullptr;
// These are for Fission DWP files.
MCSection *DwarfCUIndexSection = nullptr;
MCSection *DwarfTUIndexSection = nullptr;
/// Section for newer gnu pubnames.
MCSection *DwarfGnuPubNamesSection = nullptr;
/// Section for newer gnu pubtypes.
MCSection *DwarfGnuPubTypesSection = nullptr;
// Section for Swift AST
MCSection *DwarfSwiftASTSection = nullptr;
MCSection *COFFDebugSymbolsSection = nullptr;
MCSection *COFFDebugTypesSection = nullptr;
MCSection *COFFGlobalTypeHashesSection = nullptr;
/// Extra TLS Variable Data section.
///
/// If the target needs to put additional information for a TLS variable,
/// it'll go here.
MCSection *TLSExtraDataSection = nullptr;
/// Section directive for Thread Local data. ELF, MachO, COFF, and Wasm.
MCSection *TLSDataSection = nullptr; // Defaults to ".tdata".
/// Section directive for Thread Local uninitialized data.
///
/// Null if this target doesn't support a BSS section. ELF and MachO only.
MCSection *TLSBSSSection = nullptr; // Defaults to ".tbss".
/// StackMap section.
MCSection *StackMapSection = nullptr;
/// FaultMap section.
MCSection *FaultMapSection = nullptr;
/// Remarks section.
MCSection *RemarksSection = nullptr;
/// EH frame section.
///
/// It is initialized on demand so it can be overwritten (with uniquing).
MCSection *EHFrameSection = nullptr;
/// Section containing metadata on function stack sizes.
MCSection *StackSizesSection = nullptr;
mutable DenseMap<const MCSymbol *, unsigned> StackSizesUniquing;
// ELF specific sections.
MCSection *DataRelROSection = nullptr;
MCSection *MergeableConst4Section = nullptr;
MCSection *MergeableConst8Section = nullptr;
MCSection *MergeableConst16Section = nullptr;
MCSection *MergeableConst32Section = nullptr;
// MachO specific sections.
/// 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).
MCSection *TLSTLVSection = nullptr; // Defaults to ".tlv".
/// Section for thread local data initialization functions.
// Defaults to ".thread_init_func".
const MCSection *TLSThreadInitSection = nullptr;
MCSection *CStringSection = nullptr;
MCSection *UStringSection = nullptr;
MCSection *TextCoalSection = nullptr;
MCSection *ConstTextCoalSection = nullptr;
MCSection *ConstDataSection = nullptr;
MCSection *DataCoalSection = nullptr;
MCSection *ConstDataCoalSection = nullptr;
MCSection *DataCommonSection = nullptr;
MCSection *DataBSSSection = nullptr;
MCSection *FourByteConstantSection = nullptr;
MCSection *EightByteConstantSection = nullptr;
MCSection *SixteenByteConstantSection = nullptr;
MCSection *LazySymbolPointerSection = nullptr;
MCSection *NonLazySymbolPointerSection = nullptr;
MCSection *ThreadLocalPointerSection = nullptr;
/// COFF specific sections.
MCSection *DrectveSection = nullptr;
MCSection *PDataSection = nullptr;
MCSection *XDataSection = nullptr;
MCSection *SXDataSection = nullptr;
MCSection *GFIDsSection = nullptr;
MCSection *GLJMPSection = nullptr;
public:
void InitMCObjectFileInfo(const Triple &TT, bool PIC, MCContext &ctx,
bool LargeCodeModel = false);
bool getSupportsWeakOmittedEHFrame() const {
return SupportsWeakOmittedEHFrame;
}
bool getSupportsCompactUnwindWithoutEHFrame() const {
return SupportsCompactUnwindWithoutEHFrame;
}
bool getOmitDwarfIfHaveCompactUnwind() const {
return OmitDwarfIfHaveCompactUnwind;
}
bool getCommDirectiveSupportsAlignment() const {
return CommDirectiveSupportsAlignment;
}
unsigned getFDEEncoding() const { return FDECFIEncoding; }
unsigned getCompactUnwindDwarfEHFrameOnly() const {
return CompactUnwindDwarfEHFrameOnly;
}
MCSection *getTextSection() const { return TextSection; }
MCSection *getDataSection() const { return DataSection; }
MCSection *getBSSSection() const { return BSSSection; }
MCSection *getReadOnlySection() const { return ReadOnlySection; }
MCSection *getLSDASection() const { return LSDASection; }
MCSection *getCompactUnwindSection() const { return CompactUnwindSection; }
MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
MCSection *getDwarfInfoSection(uint64_t Hash) const {
return getDwarfComdatSection(".debug_info", Hash);
}
MCSection *getDwarfLineSection() const { return DwarfLineSection; }
MCSection *getDwarfLineStrSection() const { return DwarfLineStrSection; }
MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
MCSection *getDwarfPubNamesSection() const { return DwarfPubNamesSection; }
MCSection *getDwarfPubTypesSection() const { return DwarfPubTypesSection; }
MCSection *getDwarfGnuPubNamesSection() const {
return DwarfGnuPubNamesSection;
}
MCSection *getDwarfGnuPubTypesSection() const {
return DwarfGnuPubTypesSection;
}
const MCSection *getDwarfDebugInlineSection() const {
return DwarfDebugInlineSection;
}
MCSection *getDwarfStrSection() const { return DwarfStrSection; }
MCSection *getDwarfLocSection() const { return DwarfLocSection; }
MCSection *getDwarfARangesSection() const { return DwarfARangesSection; }
MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
MCSection *getDwarfRnglistsSection() const { return DwarfRnglistsSection; }
MCSection *getDwarfLoclistsSection() const { return DwarfLoclistsSection; }
MCSection *getDwarfMacinfoSection() const { return DwarfMacinfoSection; }
MCSection *getDwarfDebugNamesSection() const {
return DwarfDebugNamesSection;
}
MCSection *getDwarfAccelNamesSection() const {
return DwarfAccelNamesSection;
}
MCSection *getDwarfAccelObjCSection() const { return DwarfAccelObjCSection; }
MCSection *getDwarfAccelNamespaceSection() const {
return DwarfAccelNamespaceSection;
}
MCSection *getDwarfAccelTypesSection() const {
return DwarfAccelTypesSection;
}
MCSection *getDwarfInfoDWOSection() const { return DwarfInfoDWOSection; }
MCSection *getDwarfTypesSection(uint64_t Hash) const {
return getDwarfComdatSection(".debug_types", Hash);
}
MCSection *getDwarfTypesDWOSection() const { return DwarfTypesDWOSection; }
MCSection *getDwarfAbbrevDWOSection() const { return DwarfAbbrevDWOSection; }
MCSection *getDwarfStrDWOSection() const { return DwarfStrDWOSection; }
MCSection *getDwarfLineDWOSection() const { return DwarfLineDWOSection; }
MCSection *getDwarfLocDWOSection() const { return DwarfLocDWOSection; }
MCSection *getDwarfStrOffDWOSection() const { return DwarfStrOffDWOSection; }
MCSection *getDwarfStrOffSection() const { return DwarfStrOffSection; }
MCSection *getDwarfAddrSection() const { return DwarfAddrSection; }
MCSection *getDwarfRnglistsDWOSection() const {
return DwarfRnglistsDWOSection;
}
MCSection *getDwarfLoclistsDWOSection() const {
return DwarfLoclistsDWOSection;
}
MCSection *getDwarfMacinfoDWOSection() const {
return DwarfMacinfoDWOSection;
}
MCSection *getDwarfCUIndexSection() const { return DwarfCUIndexSection; }
MCSection *getDwarfTUIndexSection() const { return DwarfTUIndexSection; }
MCSection *getDwarfSwiftASTSection() const { return DwarfSwiftASTSection; }
MCSection *getCOFFDebugSymbolsSection() const {
return COFFDebugSymbolsSection;
}
MCSection *getCOFFDebugTypesSection() const {
return COFFDebugTypesSection;
}
MCSection *getCOFFGlobalTypeHashesSection() const {
return COFFGlobalTypeHashesSection;
}
MCSection *getTLSExtraDataSection() const { return TLSExtraDataSection; }
const MCSection *getTLSDataSection() const { return TLSDataSection; }
MCSection *getTLSBSSSection() const { return TLSBSSSection; }
MCSection *getStackMapSection() const { return StackMapSection; }
MCSection *getFaultMapSection() const { return FaultMapSection; }
MCSection *getRemarksSection() const { return RemarksSection; }
MCSection *getStackSizesSection(const MCSection &TextSec) const;
// ELF specific sections.
MCSection *getDataRelROSection() const { return DataRelROSection; }
const MCSection *getMergeableConst4Section() const {
return MergeableConst4Section;
}
const MCSection *getMergeableConst8Section() const {
return MergeableConst8Section;
}
const MCSection *getMergeableConst16Section() const {
return MergeableConst16Section;
}
const MCSection *getMergeableConst32Section() const {
return MergeableConst32Section;
}
// 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; }
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 *getConstDataCoalSection() const {
return ConstDataCoalSection;
}
const MCSection *getDataCommonSection() const { return DataCommonSection; }
MCSection *getDataBSSSection() const { return DataBSSSection; }
const MCSection *getFourByteConstantSection() const {
return FourByteConstantSection;
}
const MCSection *getEightByteConstantSection() const {
return EightByteConstantSection;
}
const MCSection *getSixteenByteConstantSection() const {
return SixteenByteConstantSection;
}
MCSection *getLazySymbolPointerSection() const {
return LazySymbolPointerSection;
}
MCSection *getNonLazySymbolPointerSection() const {
return NonLazySymbolPointerSection;
}
MCSection *getThreadLocalPointerSection() const {
return ThreadLocalPointerSection;
}
// COFF specific sections.
MCSection *getDrectveSection() const { return DrectveSection; }
MCSection *getPDataSection() const { return PDataSection; }
MCSection *getXDataSection() const { return XDataSection; }
MCSection *getSXDataSection() const { return SXDataSection; }
MCSection *getGFIDsSection() const { return GFIDsSection; }
MCSection *getGLJMPSection() const { return GLJMPSection; }
MCSection *getEHFrameSection() {
return EHFrameSection;
}
enum Environment { IsMachO, IsELF, IsCOFF, IsWasm, IsXCOFF };
Environment getObjectFileType() const { return Env; }
bool isPositionIndependent() const { return PositionIndependent; }
private:
Environment Env;
bool PositionIndependent = false;
MCContext *Ctx = nullptr;
Triple TT;
VersionTuple SDKVersion;
void initMachOMCObjectFileInfo(const Triple &T);
void initELFMCObjectFileInfo(const Triple &T, bool Large);
void initCOFFMCObjectFileInfo(const Triple &T);
void initWasmMCObjectFileInfo(const Triple &T);
void initXCOFFMCObjectFileInfo(const Triple &T);
MCSection *getDwarfComdatSection(const char *Name, uint64_t Hash) const;
public:
const Triple &getTargetTriple() const { return TT; }
void setSDKVersion(const VersionTuple &TheSDKVersion) {
SDKVersion = TheSDKVersion;
}
const VersionTuple &getSDKVersion() const { return SDKVersion; }
};
} // end namespace llvm
#endif
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