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Changed to use the OutputBuffer instead of the methods in MachO and ELF

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writers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33311 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2007-01-17 22:22:31 +00:00
parent f341ccbff9
commit 203d3e4386
5 changed files with 199 additions and 347 deletions
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112
lib/CodeGen/ELFWriter.cpp
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@@ -38,6 +38,7 @@
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/OutputBuffer.h"
#include "llvm/Support/Streams.h"
using namespace llvm;
@@ -50,11 +51,12 @@ namespace llvm {
/// functions to the ELF file.
class ELFCodeEmitter : public MachineCodeEmitter {
ELFWriter &EW;
TargetMachine &TM;
ELFWriter::ELFSection *ES; // Section to write to.
std::vector<unsigned char> *OutBuffer;
size_t FnStart;
public:
ELFCodeEmitter(ELFWriter &ew) : EW(ew), OutBuffer(0) {}
ELFCodeEmitter(ELFWriter &ew) : EW(ew), TM(EW.TM), OutBuffer(0) {}
void startFunction(MachineFunction &F);
bool finishFunction(MachineFunction &F);
@@ -103,8 +105,8 @@ void ELFCodeEmitter::startFunction(MachineFunction &F) {
ELFWriter::ELFSection::SHF_EXECINSTR |
ELFWriter::ELFSection::SHF_ALLOC);
OutBuffer = &ES->SectionData;
cerr << "FIXME: This code needs to be updated for changes in the"
<< " CodeEmitter interfaces. In particular, this should set "
cerr << "FIXME: This code needs to be updated for changes in the "
<< "CodeEmitter interfaces. In particular, this should set "
<< "BufferBegin/BufferEnd/CurBufferPtr, not deal with OutBuffer!";
abort();
@@ -113,8 +115,8 @@ void ELFCodeEmitter::startFunction(MachineFunction &F) {
// Add padding zeros to the end of the buffer to make sure that the
// function will start on the correct byte alignment within the section.
ELFWriter::align(*OutBuffer, Align);
OutputBuffer OB(TM, *OutBuffer);
OB.align(Align);
FnStart = OutBuffer->size();
}
@@ -145,7 +147,7 @@ bool ELFCodeEmitter::finishFunction(MachineFunction &F) {
FnSym.SetType(ELFWriter::ELFSym::STT_FUNC);
FnSym.SectionIdx = ES->SectionIdx;
FnSym.Value = FnStart; // Value = Offset from start of Section.
FnSym.Value = FnStart; // Value = Offset from start of Section.
FnSym.Size = OutBuffer->size()-FnStart;
// Finally, add it to the symtab.
@@ -180,37 +182,38 @@ bool ELFWriter::doInitialization(Module &M) {
// Local alias to shortenify coming code.
std::vector<unsigned char> &FH = FileHeader;
OutputBuffer FHOut(TM, FH);
outbyte(FH, 0x7F); // EI_MAG0
outbyte(FH, 'E'); // EI_MAG1
outbyte(FH, 'L'); // EI_MAG2
outbyte(FH, 'F'); // EI_MAG3
outbyte(FH, is64Bit ? 2 : 1); // EI_CLASS
outbyte(FH, isLittleEndian ? 1 : 2); // EI_DATA
outbyte(FH, 1); // EI_VERSION
FHOut.outbyte(0x7F); // EI_MAG0
FHOut.outbyte('E'); // EI_MAG1
FHOut.outbyte('L'); // EI_MAG2
FHOut.outbyte('F'); // EI_MAG3
FHOut.outbyte(is64Bit ? 2 : 1); // EI_CLASS
FHOut.outbyte(isLittleEndian ? 1 : 2); // EI_DATA
FHOut.outbyte(1); // EI_VERSION
FH.resize(16); // EI_PAD up to 16 bytes.
// This should change for shared objects.
outhalf(FH, 1); // e_type = ET_REL
outhalf(FH, e_machine); // e_machine = whatever the target wants
outword(FH, 1); // e_version = 1
outaddr(FH, 0); // e_entry = 0 -> no entry point in .o file
outaddr(FH, 0); // e_phoff = 0 -> no program header for .o
FHOut.outhalf(1); // e_type = ET_REL
FHOut.outhalf(e_machine); // e_machine = whatever the target wants
FHOut.outword(1); // e_version = 1
FHOut.outaddr(0); // e_entry = 0 -> no entry point in .o file
FHOut.outaddr(0); // e_phoff = 0 -> no program header for .o
ELFHeader_e_shoff_Offset = FH.size();
outaddr(FH, 0); // e_shoff
outword(FH, e_flags); // e_flags = whatever the target wants
FHOut.outaddr(0); // e_shoff
FHOut.outword(e_flags); // e_flags = whatever the target wants
outhalf(FH, is64Bit ? 64 : 52); // e_ehsize = ELF header size
outhalf(FH, 0); // e_phentsize = prog header entry size
outhalf(FH, 0); // e_phnum = # prog header entries = 0
outhalf(FH, is64Bit ? 64 : 40); // e_shentsize = sect hdr entry size
FHOut.outhalf(is64Bit ? 64 : 52); // e_ehsize = ELF header size
FHOut.outhalf(0); // e_phentsize = prog header entry size
FHOut.outhalf(0); // e_phnum = # prog header entries = 0
FHOut.outhalf(is64Bit ? 64 : 40); // e_shentsize = sect hdr entry size
ELFHeader_e_shnum_Offset = FH.size();
outhalf(FH, 0); // e_shnum = # of section header ents
FHOut.outhalf(0); // e_shnum = # of section header ents
ELFHeader_e_shstrndx_Offset = FH.size();
outhalf(FH, 0); // e_shstrndx = Section # of '.shstrtab'
FHOut.outhalf(0); // e_shstrndx = Section # of '.shstrtab'
// Add the null section, which is required to be first in the file.
getSection("", 0, 0);
@@ -350,9 +353,10 @@ void ELFWriter::EmitSymbolTable() {
StrTab.Align = 1;
DataBuffer &StrTabBuf = StrTab.SectionData;
OutputBuffer StrTabOut(TM, StrTabBuf);
// Set the zero'th symbol to a null byte, as required.
outbyte(StrTabBuf, 0);
StrTabOut.outbyte(0);
SymbolTable[0].NameIdx = 0;
unsigned Index = 1;
for (unsigned i = 1, e = SymbolTable.size(); i != e; ++i) {
@@ -385,26 +389,27 @@ void ELFWriter::EmitSymbolTable() {
SymTab.Info = FirstNonLocalSymbol; // First non-STB_LOCAL symbol.
SymTab.EntSize = 16; // Size of each symtab entry. FIXME: wrong for ELF64
DataBuffer &SymTabBuf = SymTab.SectionData;
OutputBuffer SymTabOut(TM, SymTabBuf);
if (!is64Bit) { // 32-bit and 64-bit formats are shuffled a bit.
for (unsigned i = 0, e = SymbolTable.size(); i != e; ++i) {
ELFSym &Sym = SymbolTable[i];
outword(SymTabBuf, Sym.NameIdx);
outaddr32(SymTabBuf, Sym.Value);
outword(SymTabBuf, Sym.Size);
outbyte(SymTabBuf, Sym.Info);
outbyte(SymTabBuf, Sym.Other);
outhalf(SymTabBuf, Sym.SectionIdx);
SymTabOut.outword(Sym.NameIdx);
SymTabOut.outaddr32(Sym.Value);
SymTabOut.outword(Sym.Size);
SymTabOut.outbyte(Sym.Info);
SymTabOut.outbyte(Sym.Other);
SymTabOut.outhalf(Sym.SectionIdx);
}
} else {
for (unsigned i = 0, e = SymbolTable.size(); i != e; ++i) {
ELFSym &Sym = SymbolTable[i];
outword(SymTabBuf, Sym.NameIdx);
outbyte(SymTabBuf, Sym.Info);
outbyte(SymTabBuf, Sym.Other);
outhalf(SymTabBuf, Sym.SectionIdx);
outaddr64(SymTabBuf, Sym.Value);
outxword(SymTabBuf, Sym.Size);
SymTabOut.outword(Sym.NameIdx);
SymTabOut.outbyte(Sym.Info);
SymTabOut.outbyte(Sym.Other);
SymTabOut.outhalf(Sym.SectionIdx);
SymTabOut.outaddr64(Sym.Value);
SymTabOut.outxword(Sym.Size);
}
}
@@ -420,7 +425,8 @@ void ELFWriter::EmitSectionTableStringTable() {
// Now that we know which section number is the .shstrtab section, update the
// e_shstrndx entry in the ELF header.
fixhalf(FileHeader, SHStrTab.SectionIdx, ELFHeader_e_shstrndx_Offset);
OutputBuffer FHOut(TM, FileHeader);
FHOut.fixhalf(SHStrTab.SectionIdx, ELFHeader_e_shstrndx_Offset);
// Set the NameIdx of each section in the string table and emit the bytes for
// the string table.
@@ -471,11 +477,12 @@ void ELFWriter::OutputSectionsAndSectionTable() {
// Now that we know where all of the sections will be emitted, set the e_shnum
// entry in the ELF header.
fixhalf(FileHeader, NumSections, ELFHeader_e_shnum_Offset);
OutputBuffer FHOut(TM, FileHeader);
FHOut.fixhalf(NumSections, ELFHeader_e_shnum_Offset);
// Now that we know the offset in the file of the section table, update the
// e_shoff address in the ELF header.
fixaddr(FileHeader, FileOff, ELFHeader_e_shoff_Offset);
FHOut.fixaddr(FileOff, ELFHeader_e_shoff_Offset);
// Now that we know all of the data in the file header, emit it and all of the
// sections!
@@ -484,6 +491,7 @@ void ELFWriter::OutputSectionsAndSectionTable() {
DataBuffer().swap(FileHeader);
DataBuffer Table;
OutputBuffer TableOut(TM, Table);
// Emit all of the section data and build the section table itself.
while (!SectionList.empty()) {
@@ -497,16 +505,16 @@ void ELFWriter::OutputSectionsAndSectionTable() {
O.write((char*)&S.SectionData[0], S.SectionData.size());
FileOff += S.SectionData.size();
outword(Table, S.NameIdx); // sh_name - Symbol table name idx
outword(Table, S.Type); // sh_type - Section contents & semantics
outword(Table, S.Flags); // sh_flags - Section flags.
outaddr(Table, S.Addr); // sh_addr - The mem addr this section is in.
outaddr(Table, S.Offset); // sh_offset - Offset from the file start.
outword(Table, S.Size); // sh_size - The section size.
outword(Table, S.Link); // sh_link - Section header table index link.
outword(Table, S.Info); // sh_info - Auxillary information.
outword(Table, S.Align); // sh_addralign - Alignment of section.
outword(Table, S.EntSize); // sh_entsize - Size of entries in the section.
TableOut.outword(S.NameIdx); // sh_name - Symbol table name idx
TableOut.outword(S.Type); // sh_type - Section contents & semantics
TableOut.outword(S.Flags); // sh_flags - Section flags.
TableOut.outaddr(S.Addr); // sh_addr - The mem addr this section is in.
TableOut.outaddr(S.Offset); // sh_offset - Offset from the file start.
TableOut.outword(S.Size); // sh_size - The section size.
TableOut.outword(S.Link); // sh_link - Section header table index link.
TableOut.outword(S.Info); // sh_info - Auxillary information.
TableOut.outword(S.Align); // sh_addralign - Alignment of section.
TableOut.outword(S.EntSize); // sh_entsize - Size of entries in the section
SectionList.pop_front();
}