mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-16 11:30:51 +00:00
f26e03bc7e
initialize method, which can be called when an MCContext is available. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77687 91177308-0d34-0410-b5e6-96231b3b80d8
265 lines
9.6 KiB
C++
265 lines
9.6 KiB
C++
//===-- ELFWriter.h - Target-independent ELF writer support -----*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines the ELFWriter class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef ELFWRITER_H
|
|
#define ELFWRITER_H
|
|
|
|
#include "llvm/ADT/SetVector.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#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;
|
|
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;
|
|
|
|
/// 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.
|
|
///
|
|
class ELFWriter : public MachineFunctionPass {
|
|
friend class ELFCodeEmitter;
|
|
public:
|
|
static char ID;
|
|
|
|
/// Return the ELFCodeEmitter as an instance of ObjectCodeEmitter
|
|
ObjectCodeEmitter *getObjectCodeEmitter() {
|
|
return reinterpret_cast<ObjectCodeEmitter*>(ElfCE);
|
|
}
|
|
|
|
ELFWriter(raw_ostream &O, TargetMachine &TM);
|
|
~ELFWriter();
|
|
|
|
protected:
|
|
/// Output stream to send the resultant object file to.
|
|
raw_ostream &O;
|
|
|
|
/// Target machine description.
|
|
TargetMachine &TM;
|
|
|
|
MCContext &OutContext;
|
|
|
|
/// 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 *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.
|
|
//===------------------------------------------------------------------===//
|
|
|
|
/// is64Bit/isLittleEndian - This information is inferred from the target
|
|
/// machine directly, indicating whether to emit a 32- or 64-bit ELF file.
|
|
bool is64Bit, isLittleEndian;
|
|
|
|
/// doInitialization - Emit the file header and all of the global variables
|
|
/// for the module to the ELF file.
|
|
bool doInitialization(Module &M);
|
|
bool runOnMachineFunction(MachineFunction &MF);
|
|
|
|
/// doFinalization - Now that the module has been completely processed, emit
|
|
/// the ELF file to 'O'.
|
|
bool doFinalization(Module &M);
|
|
|
|
private:
|
|
/// 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
|
|
/// is constructed from this info.
|
|
std::vector<ELFSection*> SectionList;
|
|
unsigned NumSections; // Always = SectionList.size()
|
|
|
|
/// SectionLookup - This is a mapping from section name to section number in
|
|
/// the SectionList. Used to quickly gather the Section Index from TAI 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 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;
|
|
|
|
/// 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;
|
|
|
|
// 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) {
|
|
std::string SName(Name);
|
|
fixNameForSection(SName);
|
|
|
|
ELFSection *&SN = SectionLookup[SName];
|
|
if (SN) return *SN;
|
|
|
|
SectionList.push_back(new ELFSection(SName, 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);
|
|
}
|
|
|
|
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, 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 &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(SectionKind Kind);
|
|
|
|
// addGlobalSymbol - Add a global to be processed and to the
|
|
// global symbol lookup, use a zero index for non private symbols
|
|
// because the table index will be determined later.
|
|
void addGlobalSymbol(const GlobalValue *GV);
|
|
|
|
// addExternalSymbol - 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 addExternalSymbol(const char *External);
|
|
|
|
// 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
|
|
// locations in the file.
|
|
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(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 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(const std::string &ModuleName);
|
|
void OutputSectionsAndSectionTable();
|
|
void RelocateField(BinaryObject &BO, uint32_t Offset, int64_t Value,
|
|
unsigned Size);
|
|
unsigned SortSymbols();
|
|
};
|
|
}
|
|
|
|
#endif
|