#include "llvm/ADT/SetVector.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
-#include "ELF.h"
#include <list>
#include <map>
namespace llvm {
+ class BinaryObject;
+ class Constant;
+ class ConstantStruct;
+ class ELFCodeEmitter;
+ class ELFRelocation;
+ class ELFSection;
+ class ELFSym;
class GlobalVariable;
class Mangler;
class MachineCodeEmitter;
- class ELFCodeEmitter;
+ class ObjectCodeEmitter;
+ class TargetAsmInfo;
+ class TargetELFWriterInfo;
class raw_ostream;
/// ELFWriter - This class implements the common target-independent code for
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;
/// Target machine description.
TargetMachine &TM;
+ /// Target Elf Writer description.
+ const TargetELFWriterInfo *TEW;
+
/// Mang - The object used to perform name mangling for this module.
Mangler *Mang;
/// 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.
+ const TargetAsmInfo *TAI;
//===------------------------------------------------------------------===//
// Properties inferred automatically from the target machine.
bool doFinalization(Module &M);
private:
- // The buffer we accumulate the file header into. Note that this should be
- // changed into something much more efficient later (and the bitcode writer
- // as well!).
- DataBuffer FileHeader;
-
- /// ElfHdr - Hold information about the ELF Header
- ELFHeader *ElfHdr;
+ /// Blob containing the Elf header
+ 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
/// the SectionList.
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
+ 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);
+ }
+
/// 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) {
- ELFSection *&SN = SectionLookup[Name];
+ ELFSection &getSection(const std::string &Name, unsigned Type,
+ unsigned Flags = 0, unsigned Align = 0) {
+ std::string SectionName(Name);
+ fixNameForSection(SectionName);
+
+ ELFSection *&SN = SectionLookup[SectionName];
if (SN) return *SN;
- SectionList.push_back(Name);
+ SectionList.push_back(ELFSection(SectionName, isLittleEndian, is64Bit));
SN = &SectionList.back();
SN->SectionIdx = NumSections++;
SN->Type = Type;
SN->Flags = Flags;
SN->Link = ELFSection::SHN_UNDEF;
+ SN->Align = Align;
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);
+ }
+
+ ELFSection &getSymbolTableSection() {
+ return getSection(".symtab", ELFSection::SHT_SYMTAB, 0);
+ }
+
+ ELFSection &getStringTableSection() {
+ return getSection(".strtab", ELFSection::SHT_STRTAB, 0, 1);
+ }
+
+ ELFSection &getSectionHeaderStringTableSection() {
+ return getSection(".shstrtab", ELFSection::SHT_STRTAB, 0, 1);
+ }
+
ELFSection &getDataSection() {
return getSection(".data", ELFSection::SHT_PROGBITS,
- ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC);
+ ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC, 4);
}
+
ELFSection &getBSSSection() {
return getSection(".bss", ELFSection::SHT_NOBITS,
- ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC);
+ ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC, 4);
}
- /// SymbolTable - This is the list of symbols we have emitted to the file.
- /// This actually gets rearranged before emission to the file (to put the
- /// local symbols first in the list).
- std::vector<ELFSym> SymbolTable;
+ ELFSection &getNullSection() {
+ return getSection("", ELFSection::SHT_NULL, 0);
+ }
- /// PendingSyms - This is a 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 SymbolTable.
- SetVector<GlobalValue*> PendingGlobals;
+ // Helpers for obtaining ELF specific info.
+ unsigned getGlobalELFLinkage(const GlobalValue *GV);
+ unsigned getGlobalELFVisibility(const GlobalValue *GV);
+ unsigned getElfSectionFlags(unsigned Flags);
// 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
unsigned ELFHdr_e_shoff_Offset; // e_shoff in ELF header.
unsigned ELFHdr_e_shstrndx_Offset; // e_shstrndx in ELF header.
unsigned ELFHdr_e_shnum_Offset; // e_shnum in ELF header.
+
private:
- void EmitGlobal(GlobalVariable *GV);
- void EmitSymbolTable();
+ void EmitFunctionDeclaration(const Function *F);
+ void EmitGlobalVar(const GlobalVariable *GV);
+ void EmitGlobalConstant(const Constant *C, ELFSection &GblS);
+ void EmitGlobalConstantStruct(const ConstantStruct *CVS,
+ ELFSection &GblS);
+ ELFSection &getGlobalSymELFSection(const GlobalVariable *GV, ELFSym &Sym);
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 OutputSectionsAndSectionTable();
};
}
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