mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 03:33:20 +01:00
1d48a4b1d7
out of PassManager.cpp and into Core.cpp with the rest of the C binding code. llvm-svn: 110494
252 lines
9.4 KiB
C++
252 lines
9.4 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 ConstantInt;
|
|
class ConstantStruct;
|
|
class ELFCodeEmitter;
|
|
class ELFRelocation;
|
|
class ELFSection;
|
|
struct ELFSym;
|
|
class GlobalVariable;
|
|
class JITDebugRegisterer;
|
|
class Mangler;
|
|
class MachineCodeEmitter;
|
|
class MachineConstantPoolEntry;
|
|
class ObjectCodeEmitter;
|
|
class MCAsmInfo;
|
|
class TargetELFWriterInfo;
|
|
class TargetLoweringObjectFile;
|
|
class raw_ostream;
|
|
class SectionKind;
|
|
class MCContext;
|
|
class TargetMachine;
|
|
|
|
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
|
|
/// parameterize the output format.
|
|
///
|
|
class ELFWriter : public MachineFunctionPass {
|
|
friend class ELFCodeEmitter;
|
|
friend class JITDebugRegisterer;
|
|
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;
|
|
|
|
/// Context object for machine code objects.
|
|
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;
|
|
|
|
/// 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 MCAsmInfo *MAI;
|
|
|
|
//===------------------------------------------------------------------===//
|
|
// 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 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 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;
|
|
|
|
/// 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;
|
|
|
|
SectionList.push_back(new ELFSection(Name, isLittleEndian, is64Bit));
|
|
SN = SectionList.back();
|
|
SN->SectionIdx = NumSections++;
|
|
SN->Type = Type;
|
|
SN->Flags = Flags;
|
|
SN->Link = ELF::SHN_UNDEF;
|
|
SN->Align = Align;
|
|
return *SN;
|
|
}
|
|
|
|
ELFSection &getNonExecStackSection() {
|
|
return getSection(".note.GNU-stack", ELF::SHT_PROGBITS, 0, 1);
|
|
}
|
|
|
|
ELFSection &getSymbolTableSection() {
|
|
return getSection(".symtab", ELF::SHT_SYMTAB, 0);
|
|
}
|
|
|
|
ELFSection &getStringTableSection() {
|
|
return getSection(".strtab", ELF::SHT_STRTAB, 0, 1);
|
|
}
|
|
|
|
ELFSection &getSectionHeaderStringTableSection() {
|
|
return getSection(".shstrtab", ELF::SHT_STRTAB, 0, 1);
|
|
}
|
|
|
|
ELFSection &getNullSection() {
|
|
return getSection("", ELF::SHT_NULL, 0);
|
|
}
|
|
|
|
ELFSection &getDataSection();
|
|
ELFSection &getBSSSection();
|
|
ELFSection &getCtorSection();
|
|
ELFSection &getDtorSection();
|
|
ELFSection &getJumpTableSection();
|
|
ELFSection &getConstantPoolSection(MachineConstantPoolEntry &CPE);
|
|
ELFSection &getTextSection(const Function *F);
|
|
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);
|
|
|
|
// 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
|
|
// 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);
|
|
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(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);
|
|
};
|
|
}
|
|
|
|
#endif
|