1b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes//===- MCSectionELF.h - ELF Machine Code Sections ---------------*- C++ -*-===// 2b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes// 3b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes// The LLVM Compiler Infrastructure 4b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes// 5b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes// This file is distributed under the University of Illinois Open Source 6b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes// License. See LICENSE.TXT for details. 7b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes// 8b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes//===----------------------------------------------------------------------===// 9b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes// 10b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes// This file declares the MCSectionELF class. 11b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes// 12b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes//===----------------------------------------------------------------------===// 13b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes 14b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes#ifndef LLVM_MC_MCSECTIONELF_H 15b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes#define LLVM_MC_MCSECTIONELF_H 16b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes 17dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines#include "llvm/ADT/Twine.h" 18b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes#include "llvm/MC/MCSection.h" 196948897e478cbd66626159776a8017b3c18579b9Pirama Arumuga Nainar#include "llvm/MC/MCSymbolELF.h" 2058a2cbef4aac9ee7d530dfb690c78d6fc11a2371Chandler Carruth#include "llvm/Support/Debug.h" 211c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola#include "llvm/Support/ELF.h" 22b1cc6f3dff96bfb26e0f5b62a187374b6a7629a1Eric Christopher#include "llvm/Support/raw_ostream.h" 23b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes 24b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopesnamespace llvm { 254778643912832bc8118eace1aee16554117a8eefMichael J. Spencer 262ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindolaclass MCSymbol; 272ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 28cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar/// This represents a section on linux, lots of unix variants and some bare 29cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar/// metal systems. 30cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainarclass MCSectionELF final : public MCSection { 31cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar /// This is the name of the section. The referenced memory is owned by 32cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar /// TargetLoweringObjectFileELF's ELFUniqueMap. 331f8008cf214b984954de2e986fb8cb0e5cc58606Chris Lattner StringRef SectionName; 344778643912832bc8118eace1aee16554117a8eefMichael J. Spencer 35cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar /// This is the sh_type field of a section, drawn from the enums below. 36b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes unsigned Type; 374778643912832bc8118eace1aee16554117a8eefMichael J. Spencer 38cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar /// This is the sh_flags field of a section, drawn from the enums below. 39b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes unsigned Flags; 40b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes 410c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar unsigned UniqueID; 42ebe69fe11e48d322045d5949c83283927a0d790bStephen Hines 43cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar /// The size of each entry in this section. This size only makes sense for 44cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar /// sections that contain fixed-sized entries. If a section does not contain 45cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar /// fixed-sized entries 'EntrySize' will be 0. 463e09669bc44aeb053e58ae8245ad0e49570b0e21Matt Fleming unsigned EntrySize; 474778643912832bc8118eace1aee16554117a8eefMichael J. Spencer 486948897e478cbd66626159776a8017b3c18579b9Pirama Arumuga Nainar const MCSymbolELF *Group; 492ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 500c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar /// Depending on the type of the section this is sh_link or sh_info. 510c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar const MCSectionELF *Associated; 520c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar 5374aae4726a66733c5872588287535a984f9a94c7Chris Lattnerprivate: 5474aae4726a66733c5872588287535a984f9a94c7Chris Lattner friend class MCContext; 55ebe69fe11e48d322045d5949c83283927a0d790bStephen Hines MCSectionELF(StringRef Section, unsigned type, unsigned flags, SectionKind K, 566948897e478cbd66626159776a8017b3c18579b9Pirama Arumuga Nainar unsigned entrySize, const MCSymbolELF *group, unsigned UniqueID, 570c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar MCSymbol *Begin, const MCSectionELF *Associated) 584c5e43da7792f75567b693105cc53e3f1992ad98Pirama Arumuga Nainar : MCSection(SV_ELF, K, Begin), SectionName(Section), Type(type), 590c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar Flags(flags), UniqueID(UniqueID), EntrySize(entrySize), Group(group), 606948897e478cbd66626159776a8017b3c18579b9Pirama Arumuga Nainar Associated(Associated) { 616948897e478cbd66626159776a8017b3c18579b9Pirama Arumuga Nainar if (Group) 626948897e478cbd66626159776a8017b3c18579b9Pirama Arumuga Nainar Group->setIsSignature(); 636948897e478cbd66626159776a8017b3c18579b9Pirama Arumuga Nainar } 64dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines 65dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines void setSectionName(StringRef Name) { SectionName = Name; } 66dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines 67b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopespublic: 68cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar ~MCSectionELF(); 69b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes 70cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar /// Decides whether a '.section' directive should be printed before the 71cddc3e03e4ec99c0268c03a126195173e519ed58Pirama Arumuga Nainar /// section name 72a46918d2b1b63aa3db94aa10b9ea70209b84e274Benjamin Kramer bool ShouldOmitSectionDirective(StringRef Name, const MCAsmInfo &MAI) const; 73b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes 741f8008cf214b984954de2e986fb8cb0e5cc58606Chris Lattner StringRef getSectionName() const { return SectionName; } 75b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes unsigned getType() const { return Type; } 76b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes unsigned getFlags() const { return Flags; } 776b2e257e74b2c8e2f93bb244e0c80cb73005b74aMatt Fleming unsigned getEntrySize() const { return EntrySize; } 786948897e478cbd66626159776a8017b3c18579b9Pirama Arumuga Nainar const MCSymbolELF *getGroup() const { return Group; } 794778643912832bc8118eace1aee16554117a8eefMichael J. Spencer 8036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines void PrintSwitchToSection(const MCAsmInfo &MAI, raw_ostream &OS, 8136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const MCExpr *Subsection) const override; 8236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines bool UseCodeAlign() const override; 8336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines bool isVirtualSection() const override; 84083cf1574facc9ce468fba1735c794bd7e520108Jan Wen Voung 850c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar bool isUnique() const { return UniqueID != ~0U; } 860c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar unsigned getUniqueID() const { return UniqueID; } 870c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar 880c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar const MCSectionELF *getAssociatedSection() const { return Associated; } 890c7f116bb6950ef819323d855415b2f2b0aad987Pirama Arumuga Nainar 909a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar static bool classof(const MCSection *S) { 919a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar return S->getVariant() == SV_ELF; 929a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar } 93b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes}; 94b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes 95b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes} // end namespace llvm 96b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes 97b808588a3a5febe931896b3779d159ba90d836f7Bruno Cardoso Lopes#endif 98