#include "llvm/ADT/SetVector.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Target/TargetAsmInfo.h"
-#include "llvm/Target/TargetELFWriterInfo.h"
-#include "ELF.h"
-#include <list>
#include <map>
namespace llvm {
class BinaryObject;
+ class Constant;
class ConstantStruct;
class ELFCodeEmitter;
+ class ELFRelocation;
+ class ELFSection;
+ struct ELFSym;
class GlobalVariable;
class Mangler;
class MachineCodeEmitter;
+ class MachineConstantPoolEntry;
+ class ObjectCodeEmitter;
+ class TargetAsmInfo;
+ class TargetELFWriterInfo;
class raw_ostream;
+ typedef std::vector<ELFSym*>::iterator ELFSymIter;
+ typedef std::vector<ELFSection*>::iterator ELFSectionIter;
+
/// ELFWriter - This class implements the common target-independent code for
/// writing ELF files. Targets should derive a class from this to
/// parameterize the output format.
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;
/// 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
/// globals and other target specific stuff.
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 TAI names
std::map<std::string, ELFSection*> SectionLookup;
/// 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;
+ /// 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;
/// 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 elf unused chars. 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);
+ }
+
/// 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) {
- ELFSection *&SN = SectionLookup[Name];
- if (SN) return *SN;
+ std::string SName(Name);
+ fixNameForSection(SName);
- // Remove tab from section name prefix. This is necessary becase TAI
- // sometimes return a section name prefixed with a "\t" char.
- std::string SectionName(Name);
- size_t Pos = SectionName.find("\t");
- if (Pos != std::string::npos)
- SectionName.erase(Pos, 1);
+ ELFSection *&SN = SectionLookup[SName];
+ if (SN) return *SN;
- SectionList.push_back(ELFSection(SectionName, isLittleEndian, is64Bit));
- SN = &SectionList.back();
+ SectionList.push_back(new ELFSection(SName, isLittleEndian, is64Bit));
+ SN = SectionList.back();
SN->SectionIdx = NumSections++;
SN->Type = Type;
SN->Flags = Flags;
ELFSection::SHF_EXECINSTR | ELFSection::SHF_ALLOC);
}
- /// 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) {
- 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, TEW->getPrefELFAlignment());
- }
-
ELFSection &getNonExecStackSection() {
return getSection(".note.GNU-stack", ELFSection::SHT_PROGBITS, 0, 1);
}
return getSection("", ELFSection::SHT_NULL, 0);
}
+ ELFSection &getJumpTableSection();
+ ELFSection &getConstantPoolSection(MachineConstantPoolEntry &CPE);
+ ELFSection &getRelocSection(ELFSection &S);
+
+ // Helpers for obtaining ELF specific info.
+ unsigned getGlobalELFBinding(const GlobalValue *GV);
+ unsigned getGlobalELFType(const GlobalValue *GV);
+ unsigned getGlobalELFVisibility(const GlobalValue *GV);
+ unsigned getElfSectionFlags(unsigned Flags);
+
+ // setGlobalSymLookup - Set global value 'GV' with 'Index' in the lookup map
+ void setGlobalSymLookup(const GlobalValue *GV, unsigned Index) {
+ GblSymLookup[GV] = Index;
+ }
+
// 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
// the offset in ELFHeader of these various pieces to update and other
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);
- unsigned getGlobalELFLinkage(const GlobalVariable *GV);
ELFSection &getGlobalSymELFSection(const GlobalVariable *GV, ELFSym &Sym);
void EmitRelocations();
void EmitRelocation(BinaryObject &RelSec, ELFRelocation &Rel, bool HasRelA);
void EmitSymbolTable();
void EmitStringTable();
void OutputSectionsAndSectionTable();
+ void RelocateField(BinaryObject &BO, uint32_t Offset, int64_t Value,
+ unsigned Size);
+ unsigned SortSymbols();
};
}
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