// #3. ".bss" entry - global variables without initializers. [ if needed ]
// ...
// #N. ".shstrtab" entry - String table for the section names.
-
//
// NOTE: This code should eventually be extended to support 64-bit ELF (this
// won't be hard), but we haven't done so yet!
//
//===----------------------------------------------------------------------===//
-#include "llvm/CodeGen/ELFWriter.h"
+#include "ELFWriter.h"
#include "llvm/Module.h"
+#include "llvm/PassManager.h"
+#include "llvm/CodeGen/FileWriters.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetELFWriterInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Mangler.h"
+#include "llvm/Support/OutputBuffer.h"
+#include "llvm/Support/Streams.h"
+#include <list>
using namespace llvm;
+/// AddELFWriter - Concrete function to add the ELF writer to the function pass
+/// manager.
+MachineCodeEmitter *llvm::AddELFWriter(FunctionPassManager &FPM,
+ std::ostream &O,
+ TargetMachine &TM) {
+ ELFWriter *EW = new ELFWriter(O, TM);
+ FPM.add(EW);
+ return &EW->getMachineCodeEmitter();
+}
+
//===----------------------------------------------------------------------===//
// ELFCodeEmitter Implementation
//===----------------------------------------------------------------------===//
/// 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);
- void finishFunction(MachineFunction &F);
+ bool finishFunction(MachineFunction &F);
- void emitConstantPool(MachineConstantPool *MCP) {
- if (MCP->isEmpty()) return;
- assert(0 && "unimp");
- }
- virtual void emitByte(unsigned char B) {
- OutBuffer->push_back(B);
- }
- virtual void emitWordAt(unsigned W, unsigned *Ptr) {
- assert(0 && "ni");
- }
- virtual void emitWord(unsigned W) {
- assert(0 && "ni");
- }
- virtual uint64_t getCurrentPCValue() {
- return OutBuffer->size();
- }
- virtual uint64_t getCurrentPCOffset() {
- return OutBuffer->size()-FnStart;
- }
void addRelocation(const MachineRelocation &MR) {
assert(0 && "relo not handled yet!");
}
- virtual uint64_t getConstantPoolEntryAddress(unsigned Index) {
+
+ virtual void StartMachineBasicBlock(MachineBasicBlock *MBB) {
+ }
+
+ virtual intptr_t getConstantPoolEntryAddress(unsigned Index) const {
assert(0 && "CP not implementated yet!");
return 0;
}
+ virtual intptr_t getJumpTableEntryAddress(unsigned Index) const {
+ assert(0 && "JT not implementated yet!");
+ return 0;
+ }
- virtual unsigned char* allocateGlobal(unsigned size, unsigned alignment) {
- assert(0 && "Globals not implemented yet!");
+ virtual intptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const {
+ assert(0 && "JT not implementated yet!");
return 0;
}
/// JIT SPECIFIC FUNCTIONS - DO NOT IMPLEMENT THESE HERE!
- void startFunctionStub(unsigned StubSize) {
+ void startFunctionStub(unsigned StubSize, unsigned Alignment = 1) {
assert(0 && "JIT specific function called!");
abort();
}
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 "
+ << "BufferBegin/BufferEnd/CurBufferPtr, not deal with OutBuffer!";
+ abort();
// Upgrade the section alignment if required.
if (ES->Align < Align) ES->Align = Align;
// 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.
- size_t SectionOff = OutBuffer->size();
- ELFWriter::align(*OutBuffer, Align);
-
+ OutputBuffer OB(*OutBuffer,
+ TM.getTargetData()->getPointerSizeInBits() == 64,
+ TM.getTargetData()->isLittleEndian());
+ OB.align(Align);
FnStart = OutBuffer->size();
}
/// finishFunction - This callback is invoked after the function is completely
/// finished.
-void ELFCodeEmitter::finishFunction(MachineFunction &F) {
+bool ELFCodeEmitter::finishFunction(MachineFunction &F) {
// We now know the size of the function, add a symbol to represent it.
ELFWriter::ELFSym FnSym(F.getFunction());
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.
EW.SymbolTable.push_back(FnSym);
+ return false;
}
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
ELFWriter::ELFWriter(std::ostream &o, TargetMachine &tm) : O(o), TM(tm) {
- e_machine = 0; // e_machine defaults to 'No Machine'
e_flags = 0; // e_flags defaults to 0, no flags.
- is64Bit = TM.getTargetData().getPointerSizeInBits() == 64;
- isLittleEndian = TM.getTargetData().isLittleEndian();
+ is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
+ isLittleEndian = TM.getTargetData()->isLittleEndian();
// Create the machine code emitter object for this target.
MCE = new ELFCodeEmitter(*this);
// Local alias to shortenify coming code.
std::vector<unsigned char> &FH = FileHeader;
-
- 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
+ OutputBuffer FHOut(FH, is64Bit, isLittleEndian);
+
+ 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.outword(TM.getELFWriterInfo()->getEMachine()); // target-defined
+ 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);
}
const Type *GVType = (const Type*)GV->getType();
- unsigned Align = TM.getTargetData().getTypeAlignment(GVType);
- unsigned Size = TM.getTargetData().getTypeSize(GVType);
+ unsigned Align = TM.getTargetData()->getPrefTypeAlignment(GVType);
+ unsigned Size = TM.getTargetData()->getTypeSize(GVType);
// If this global has a zero initializer, it is part of the .bss or common
// section.
StrTab.Align = 1;
DataBuffer &StrTabBuf = StrTab.SectionData;
+ OutputBuffer StrTabOut(StrTabBuf, is64Bit, isLittleEndian);
// 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) {
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(SymTabBuf, is64Bit, isLittleEndian);
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);
}
}
// 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(FileHeader, is64Bit, isLittleEndian);
+ 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.
// 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(FileHeader, is64Bit, isLittleEndian);
+ 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!
DataBuffer().swap(FileHeader);
DataBuffer Table;
+ OutputBuffer TableOut(Table, is64Bit, isLittleEndian);
// Emit all of the section data and build the section table itself.
while (!SectionList.empty()) {
if (S.Align)
for (size_t NewFileOff = (FileOff+S.Align-1) & ~(S.Align-1);
FileOff != NewFileOff; ++FileOff)
- O.put(0xAB);
+ O.put((char)0xAB);
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();
}
// Align output for the section table.
for (size_t NewFileOff = (FileOff+TableAlign-1) & ~(TableAlign-1);
FileOff != NewFileOff; ++FileOff)
- O.put(0xAB);
+ O.put((char)0xAB);
// Emit the section table itself.
O.write((char*)&Table[0], Table.size());
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