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author | rdivacky <rdivacky@FreeBSD.org> | 2009-10-14 17:57:32 +0000 |
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committer | rdivacky <rdivacky@FreeBSD.org> | 2009-10-14 17:57:32 +0000 |
commit | cd749a9c07f1de2fb8affde90537efa4bc3e7c54 (patch) | |
tree | b21f6de4e08b89bb7931806bab798fc2a5e3a686 /lib/CodeGen/ELFWriter.h | |
parent | 72621d11de5b873f1695f391eb95f0b336c3d2d4 (diff) | |
download | FreeBSD-src-cd749a9c07f1de2fb8affde90537efa4bc3e7c54.zip FreeBSD-src-cd749a9c07f1de2fb8affde90537efa4bc3e7c54.tar.gz |
Update llvm to r84119.
Diffstat (limited to 'lib/CodeGen/ELFWriter.h')
-rw-r--r-- | lib/CodeGen/ELFWriter.h | 191 |
1 files changed, 95 insertions, 96 deletions
diff --git a/lib/CodeGen/ELFWriter.h b/lib/CodeGen/ELFWriter.h index bab118c..b61b484 100644 --- a/lib/CodeGen/ELFWriter.h +++ b/lib/CodeGen/ELFWriter.h @@ -16,23 +16,35 @@ #include "llvm/ADT/SetVector.h" #include "llvm/CodeGen/MachineFunctionPass.h" -#include <list> #include <map> namespace llvm { class BinaryObject; class Constant; + class ConstantInt; class ConstantStruct; class ELFCodeEmitter; + class ELFRelocation; + class ELFSection; + struct ELFSym; class GlobalVariable; + class JITDebugRegisterer; class Mangler; class MachineCodeEmitter; - class TargetAsmInfo; + class MachineConstantPoolEntry; + class ObjectCodeEmitter; + class MCAsmInfo; class TargetELFWriterInfo; + class TargetLoweringObjectFile; class raw_ostream; - class ELFSection; - class ELFSym; - class ELFRelocation; + class SectionKind; + class MCContext; + + typedef std::vector<ELFSym*>::iterator ELFSymIter; + typedef std::vector<ELFSection*>::iterator ELFSectionIter; + typedef SetVector<const GlobalValue*>::const_iterator PendingGblsIter; + typedef SetVector<const char *>::const_iterator PendingExtsIter; + typedef std::pair<const Constant *, int64_t> CstExprResTy; /// ELFWriter - This class implements the common target-independent code for /// writing ELF files. Targets should derive a class from this to @@ -40,18 +52,18 @@ namespace llvm { /// class ELFWriter : public MachineFunctionPass { friend class ELFCodeEmitter; + friend class JITDebugRegisterer; public: static char ID; - MachineCodeEmitter &getMachineCodeEmitter() const { - return *(MachineCodeEmitter*)MCE; + /// Return the ELFCodeEmitter as an instance of ObjectCodeEmitter + ObjectCodeEmitter *getObjectCodeEmitter() { + return reinterpret_cast<ObjectCodeEmitter*>(ElfCE); } ELFWriter(raw_ostream &O, TargetMachine &TM); ~ELFWriter(); - typedef std::vector<unsigned char> DataBuffer; - protected: /// Output stream to send the resultant object file to. raw_ostream &O; @@ -59,6 +71,9 @@ namespace llvm { /// Target machine description. TargetMachine &TM; + /// Context object for machine code objects. + MCContext &OutContext; + /// Target Elf Writer description. const TargetELFWriterInfo *TEW; @@ -67,11 +82,15 @@ namespace llvm { /// MCE - The MachineCodeEmitter object that we are exposing to emit machine /// code for functions to the .o file. - ELFCodeEmitter *MCE; + ELFCodeEmitter *ElfCE; - /// TAI - Target Asm Info, provide information about section names for + /// TLOF - Target Lowering Object File, provide section names for globals + /// and other object file specific stuff + const TargetLoweringObjectFile &TLOF; + + /// MAI - Target Asm Info, provide information about section names for /// globals and other target specific stuff. - const TargetAsmInfo *TAI; + const MCAsmInfo *MAI; //===------------------------------------------------------------------===// // Properties inferred automatically from the target machine. @@ -95,59 +114,49 @@ namespace llvm { BinaryObject ElfHdr; /// SectionList - This is the list of sections that we have emitted to the - /// file. Once the file has been completely built, the section header table + /// file. Once the file has been completely built, the section header table /// is constructed from this info. - std::list<ELFSection> SectionList; + std::vector<ELFSection*> SectionList; unsigned NumSections; // Always = SectionList.size() /// SectionLookup - This is a mapping from section name to section number in - /// the SectionList. + /// the SectionList. Used to quickly gather the Section Index from MAI names std::map<std::string, ELFSection*> SectionLookup; + /// PendingGlobals - Globals not processed as symbols yet. + SetVector<const GlobalValue*> PendingGlobals; + /// GblSymLookup - This is a mapping from global value to a symbol index - /// in the symbol table. This is useful since relocations symbol references - /// must be quickly mapped to a symbol table index + /// in the symbol table or private symbols list. This is useful since reloc + /// symbol references must be quickly mapped to their indices on the lists. std::map<const GlobalValue*, uint32_t> GblSymLookup; - /// SymbolList - This is the list of symbols emitted to the symbol table - /// Local symbols go to the front and Globals to the back. - std::list<ELFSym> SymbolList; - - /// PendingGlobals - List of externally defined symbols that we have been - /// asked to emit, but have not seen a reference to. When a reference - /// is seen, the symbol will move from this list to the SymbolList. - SetVector<GlobalValue*> PendingGlobals; - - // Remove tab from section name prefix. This is necessary becase TAI - // sometimes return a section name prefixed with a "\t" char. This is - // a little bit dirty. FIXME: find a better approach, maybe add more - // methods to TAI to get the clean name? - void fixNameForSection(std::string &Name) { - size_t Pos = Name.find("\t"); - if (Pos != std::string::npos) - Name.erase(Pos, 1); - - Pos = Name.find(".section "); - if (Pos != std::string::npos) - Name.erase(Pos, 9); - - Pos = Name.find("\n"); - if (Pos != std::string::npos) - Name.erase(Pos, 1); - } + /// PendingExternals - Externals not processed as symbols yet. + SetVector<const char *> PendingExternals; + + /// ExtSymLookup - This is a mapping from externals to a symbol index + /// in the symbol table list. This is useful since reloc symbol references + /// must be quickly mapped to their symbol table indices. + std::map<const char *, uint32_t> ExtSymLookup; + + /// SymbolList - This is the list of symbols emitted to the symbol table. + /// When the SymbolList is finally built, local symbols must be placed in + /// the beginning while non-locals at the end. + std::vector<ELFSym*> SymbolList; + + /// PrivateSyms - Record private symbols, every symbol here must never be + /// present in the SymbolList. + std::vector<ELFSym*> PrivateSyms; /// getSection - Return the section with the specified name, creating a new /// section if one does not already exist. ELFSection &getSection(const std::string &Name, unsigned Type, unsigned Flags = 0, unsigned Align = 0) { - std::string SectionName(Name); - fixNameForSection(SectionName); - - ELFSection *&SN = SectionLookup[SectionName]; + ELFSection *&SN = SectionLookup[Name]; if (SN) return *SN; - SectionList.push_back(ELFSection(SectionName, isLittleEndian, is64Bit)); - SN = &SectionList.back(); + SectionList.push_back(new ELFSection(Name, isLittleEndian, is64Bit)); + SN = SectionList.back(); SN->SectionIdx = NumSections++; SN->Type = Type; SN->Flags = Flags; @@ -156,37 +165,6 @@ namespace llvm { return *SN; } - /// TODO: support mangled names here to emit the right .text section - /// for c++ object files. - ELFSection &getTextSection() { - return getSection(".text", ELFSection::SHT_PROGBITS, - ELFSection::SHF_EXECINSTR | ELFSection::SHF_ALLOC); - } - - /// Get jump table section on the section name returned by TAI - ELFSection &getJumpTableSection(std::string SName, unsigned Align) { - return getSection(SName, ELFSection::SHT_PROGBITS, - ELFSection::SHF_ALLOC, Align); - } - - /// Get a constant pool section based on the section name returned by TAI - ELFSection &getConstantPoolSection(std::string SName, unsigned Align) { - return getSection(SName, ELFSection::SHT_PROGBITS, - ELFSection::SHF_MERGE | ELFSection::SHF_ALLOC, Align); - } - - /// Return the relocation section of section 'S'. 'RelA' is true - /// if the relocation section contains entries with addends. - ELFSection &getRelocSection(std::string SName, bool RelA, unsigned Align) { - std::string RelSName(".rel"); - unsigned SHdrTy = RelA ? ELFSection::SHT_RELA : ELFSection::SHT_REL; - - if (RelA) RelSName.append("a"); - RelSName.append(SName); - - return getSection(RelSName, SHdrTy, 0, Align); - } - ELFSection &getNonExecStackSection() { return getSection(".note.GNU-stack", ELFSection::SHT_PROGBITS, 0, 1); } @@ -203,24 +181,38 @@ namespace llvm { return getSection(".shstrtab", ELFSection::SHT_STRTAB, 0, 1); } - ELFSection &getDataSection() { - return getSection(".data", ELFSection::SHT_PROGBITS, - ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC, 4); - } - - ELFSection &getBSSSection() { - return getSection(".bss", ELFSection::SHT_NOBITS, - ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC, 4); - } - ELFSection &getNullSection() { return getSection("", ELFSection::SHT_NULL, 0); } + ELFSection &getDataSection(); + ELFSection &getBSSSection(); + ELFSection &getCtorSection(); + ELFSection &getDtorSection(); + ELFSection &getJumpTableSection(); + ELFSection &getConstantPoolSection(MachineConstantPoolEntry &CPE); + ELFSection &getTextSection(Function *F); + ELFSection &getRelocSection(ELFSection &S); + // Helpers for obtaining ELF specific info. - unsigned getGlobalELFLinkage(const GlobalValue *GV); + unsigned getGlobalELFBinding(const GlobalValue *GV); + unsigned getGlobalELFType(const GlobalValue *GV); unsigned getGlobalELFVisibility(const GlobalValue *GV); - unsigned getElfSectionFlags(unsigned Flags); + + // AddPendingGlobalSymbol - Add a global to be processed and to + // the global symbol lookup, use a zero index because the table + // index will be determined later. + void AddPendingGlobalSymbol(const GlobalValue *GV, + bool AddToLookup = false); + + // AddPendingExternalSymbol - Add the external to be processed + // and to the external symbol lookup, use a zero index because + // the symbol table index will be determined later. + void AddPendingExternalSymbol(const char *External); + + // AddToSymbolList - Update the symbol lookup and If the symbol is + // private add it to PrivateSyms list, otherwise to SymbolList. + void AddToSymbolList(ELFSym *GblSym); // As we complete the ELF file, we need to update fields in the ELF header // (e.g. the location of the section table). These members keep track of @@ -231,20 +223,27 @@ namespace llvm { unsigned ELFHdr_e_shnum_Offset; // e_shnum in ELF header. private: - void EmitFunctionDeclaration(const Function *F); - void EmitGlobalVar(const GlobalVariable *GV); + void EmitGlobal(const GlobalValue *GV); void EmitGlobalConstant(const Constant *C, ELFSection &GblS); void EmitGlobalConstantStruct(const ConstantStruct *CVS, ELFSection &GblS); - ELFSection &getGlobalSymELFSection(const GlobalVariable *GV, ELFSym &Sym); + void EmitGlobalConstantLargeInt(const ConstantInt *CI, ELFSection &S); + void EmitGlobalDataRelocation(const GlobalValue *GV, unsigned Size, + ELFSection &GblS, int64_t Offset = 0); + bool EmitSpecialLLVMGlobal(const GlobalVariable *GV); + void EmitXXStructorList(Constant *List, ELFSection &Xtor); void EmitRelocations(); void EmitRelocation(BinaryObject &RelSec, ELFRelocation &Rel, bool HasRelA); void EmitSectionHeader(BinaryObject &SHdrTab, const ELFSection &SHdr); void EmitSectionTableStringTable(); void EmitSymbol(BinaryObject &SymbolTable, ELFSym &Sym); void EmitSymbolTable(); - void EmitStringTable(); + void EmitStringTable(const std::string &ModuleName); void OutputSectionsAndSectionTable(); + void RelocateField(BinaryObject &BO, uint32_t Offset, int64_t Value, + unsigned Size); + unsigned SortSymbols(); + CstExprResTy ResolveConstantExpr(const Constant *CV); }; } |