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c997d45ae5
Emission for globals, using the correct data sections Function alignment can be computed for each target using TargetELFWriterInfo Some small fixes git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73201 91177308-0d34-0410-b5e6-96231b3b80d8
178 lines
6.2 KiB
C++
178 lines
6.2 KiB
C++
//===-- ELFWriter.h - Target-independent ELF writer support -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the ELFWriter class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef ELFWRITER_H
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#define ELFWRITER_H
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#include "llvm/ADT/SetVector.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Support/OutputBuffer.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetELFWriterInfo.h"
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#include "ELF.h"
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#include <list>
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#include <map>
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namespace llvm {
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class ConstantStruct;
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class ELFCodeEmitter;
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class GlobalVariable;
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class Mangler;
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class MachineCodeEmitter;
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class raw_ostream;
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/// ELFWriter - This class implements the common target-independent code for
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/// writing ELF files. Targets should derive a class from this to
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/// parameterize the output format.
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///
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class ELFWriter : public MachineFunctionPass {
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friend class ELFCodeEmitter;
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public:
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static char ID;
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MachineCodeEmitter &getMachineCodeEmitter() const {
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return *(MachineCodeEmitter*)MCE;
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}
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ELFWriter(raw_ostream &O, TargetMachine &TM);
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~ELFWriter();
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typedef std::vector<unsigned char> DataBuffer;
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protected:
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/// Output stream to send the resultant object file to.
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raw_ostream &O;
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/// Target machine description.
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TargetMachine &TM;
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/// Mang - The object used to perform name mangling for this module.
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Mangler *Mang;
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/// MCE - The MachineCodeEmitter object that we are exposing to emit machine
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/// code for functions to the .o file.
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ELFCodeEmitter *MCE;
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/// TAI - Target Asm Info, provide information about section names for
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/// globals and other target specific stuff.
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const TargetAsmInfo *TAI;
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//===------------------------------------------------------------------===//
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// Properties inferred automatically from the target machine.
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//===------------------------------------------------------------------===//
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/// is64Bit/isLittleEndian - This information is inferred from the target
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/// machine directly, indicating whether to emit a 32- or 64-bit ELF file.
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bool is64Bit, isLittleEndian;
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/// doInitialization - Emit the file header and all of the global variables
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/// for the module to the ELF file.
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bool doInitialization(Module &M);
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bool runOnMachineFunction(MachineFunction &MF);
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/// doFinalization - Now that the module has been completely processed, emit
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/// the ELF file to 'O'.
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bool doFinalization(Module &M);
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private:
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// The buffer we accumulate the file header into. Note that this should be
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// changed into something much more efficient later (and the bitcode writer
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// as well!).
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DataBuffer FileHeader;
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/// ElfHdr - Hold information about the ELF Header
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ELFHeader *ElfHdr;
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/// SectionList - This is the list of sections that we have emitted to the
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/// file. Once the file has been completely built, the section header table
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/// is constructed from this info.
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std::list<ELFSection> SectionList;
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unsigned NumSections; // Always = SectionList.size()
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/// SectionLookup - This is a mapping from section name to section number in
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/// the SectionList.
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std::map<std::string, ELFSection*> SectionLookup;
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/// getSection - Return the section with the specified name, creating a new
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/// section if one does not already exist.
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ELFSection &getSection(const std::string &Name, unsigned Type,
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unsigned Flags = 0, unsigned Align = 0) {
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ELFSection *&SN = SectionLookup[Name];
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if (SN) return *SN;
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SectionList.push_back(Name);
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SN = &SectionList.back();
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SN->SectionIdx = NumSections++;
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SN->Type = Type;
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SN->Flags = Flags;
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SN->Link = ELFSection::SHN_UNDEF;
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SN->Align = Align;
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return *SN;
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}
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ELFSection &getTextSection() {
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return getSection(".text", ELFSection::SHT_PROGBITS,
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ELFSection::SHF_EXECINSTR | ELFSection::SHF_ALLOC);
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}
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ELFSection &getSymbolTableSection() {
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return getSection(".symtab", ELFSection::SHT_SYMTAB, 0);
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}
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ELFSection &getStringTableSection() {
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return getSection(".strtab", ELFSection::SHT_STRTAB, 0, 1);
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}
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ELFSection &getDataSection() {
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return getSection(".data", ELFSection::SHT_PROGBITS,
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ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC);
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}
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ELFSection &getBSSSection() {
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return getSection(".bss", ELFSection::SHT_NOBITS,
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ELFSection::SHF_WRITE | ELFSection::SHF_ALLOC);
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}
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/// SymbolTable - This is the list of symbols we have emitted to the file.
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/// This actually gets rearranged before emission to the file (to put the
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/// local symbols first in the list).
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std::vector<ELFSym> SymbolTable;
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/// PendingSyms - This is a list of externally defined symbols that we have
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/// been asked to emit, but have not seen a reference to. When a reference
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/// is seen, the symbol will move from this list to the SymbolTable.
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SetVector<GlobalValue*> PendingGlobals;
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// As we complete the ELF file, we need to update fields in the ELF header
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// (e.g. the location of the section table). These members keep track of
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// the offset in ELFHeader of these various pieces to update and other
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// locations in the file.
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unsigned ELFHdr_e_shoff_Offset; // e_shoff in ELF header.
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unsigned ELFHdr_e_shstrndx_Offset; // e_shstrndx in ELF header.
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unsigned ELFHdr_e_shnum_Offset; // e_shnum in ELF header.
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private:
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void EmitGlobal(GlobalVariable *GV);
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void EmitGlobalConstant(const Constant *C, OutputBuffer &GblCstTab);
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void EmitGlobalConstantStruct(const ConstantStruct *CVS,
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OutputBuffer &GblCstTab);
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void EmitRelocations();
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void EmitSectionHeader(OutputBuffer &TableOut, const ELFSection &Section);
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void EmitSectionTableStringTable();
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void EmitSymbol(OutputBuffer &SymTabOut, ELFSym &Sym);
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void EmitSymbolTable();
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void OutputSectionsAndSectionTable();
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};
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}
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#endif
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