1 //===-- MachOWriter.cpp - Target-independent Mach-O Writer code -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the target-independent Mach-O writer. This file writes
11 // out the Mach-O file in the following order:
13 // #1 FatHeader (universal-only)
14 // #2 FatArch (universal-only, 1 per universal arch)
23 //===----------------------------------------------------------------------===//
26 #include "MachOWriter.h"
27 #include "MachOCodeEmitter.h"
28 #include "llvm/Constants.h"
29 #include "llvm/DerivedTypes.h"
30 #include "llvm/Module.h"
31 #include "llvm/PassManager.h"
32 #include "llvm/Target/TargetAsmInfo.h"
33 #include "llvm/Target/TargetData.h"
34 #include "llvm/Target/TargetMachine.h"
35 #include "llvm/Target/TargetMachOWriterInfo.h"
36 #include "llvm/Support/Mangler.h"
37 #include "llvm/Support/OutputBuffer.h"
38 #include "llvm/Support/raw_ostream.h"
42 /// AddMachOWriter - Concrete function to add the Mach-O writer to the function
44 ObjectCodeEmitter *AddMachOWriter(PassManagerBase &PM,
47 MachOWriter *MOW = new MachOWriter(O, TM);
49 return MOW->getObjectCodeEmitter();
52 //===----------------------------------------------------------------------===//
53 // MachOWriter Implementation
54 //===----------------------------------------------------------------------===//
56 char MachOWriter::ID = 0;
58 MachOWriter::MachOWriter(raw_ostream &o, TargetMachine &tm)
59 : MachineFunctionPass(&ID), O(o), TM(tm) {
60 is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
61 isLittleEndian = TM.getTargetData()->isLittleEndian();
63 TAI = TM.getTargetAsmInfo();
65 // Create the machine code emitter object for this target.
66 MachOCE = new MachOCodeEmitter(*this, *getTextSection(true));
69 MachOWriter::~MachOWriter() {
73 bool MachOWriter::doInitialization(Module &M) {
74 // Set the magic value, now that we know the pointer size and endianness
75 Header.setMagic(isLittleEndian, is64Bit);
78 // FIXME: this only works for object files, we do not support the creation
79 // of dynamic libraries or executables at this time.
80 Header.filetype = MachOHeader::MH_OBJECT;
82 Mang = new Mangler(M);
86 bool MachOWriter::runOnMachineFunction(MachineFunction &MF) {
90 /// doFinalization - Now that the module has been completely processed, emit
91 /// the Mach-O file to 'O'.
92 bool MachOWriter::doFinalization(Module &M) {
93 // FIXME: we don't handle debug info yet, we should probably do that.
94 // Okay, the.text section has been completed, build the .data, .bss, and
95 // "common" sections next.
97 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
101 // Emit the header and load commands.
102 EmitHeaderAndLoadCommands();
104 // Emit the various sections and their relocation info.
108 // Write the symbol table and the string table to the end of the file.
109 O.write((char*)&SymT[0], SymT.size());
110 O.write((char*)&StrT[0], StrT.size());
112 // We are done with the abstract symbols.
115 DynamicSymbolTable.clear();
117 // Release the name mangler object.
118 delete Mang; Mang = 0;
122 // getConstSection - Get constant section for Constant 'C'
123 MachOSection *MachOWriter::getConstSection(Constant *C) {
124 const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
125 if (CVA && CVA->isCString())
126 return getSection("__TEXT", "__cstring",
127 MachOSection::S_CSTRING_LITERALS);
129 const Type *Ty = C->getType();
130 if (Ty->isPrimitiveType() || Ty->isInteger()) {
131 unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty);
133 default: break; // Fall through to __TEXT,__const
135 return getSection("__TEXT", "__literal4",
136 MachOSection::S_4BYTE_LITERALS);
138 return getSection("__TEXT", "__literal8",
139 MachOSection::S_8BYTE_LITERALS);
141 return getSection("__TEXT", "__literal16",
142 MachOSection::S_16BYTE_LITERALS);
145 return getSection("__TEXT", "__const");
148 // getJumpTableSection - Select the Jump Table section
149 MachOSection *MachOWriter::getJumpTableSection() {
150 if (TM.getRelocationModel() == Reloc::PIC_)
151 return getTextSection(false);
153 return getSection("__TEXT", "__const");
156 // getSection - Return the section with the specified name, creating a new
157 // section if one does not already exist.
158 MachOSection *MachOWriter::getSection(const std::string &seg,
159 const std::string §,
160 unsigned Flags /* = 0 */ ) {
161 MachOSection *MOS = SectionLookup[seg+sect];
164 MOS = new MachOSection(seg, sect);
165 SectionList.push_back(MOS);
166 MOS->Index = SectionList.size();
167 MOS->flags = MachOSection::S_REGULAR | Flags;
168 SectionLookup[seg+sect] = MOS;
172 // getTextSection - Return text section with different flags for code/data
173 MachOSection *MachOWriter::getTextSection(bool isCode /* = true */ ) {
175 return getSection("__TEXT", "__text",
176 MachOSection::S_ATTR_PURE_INSTRUCTIONS |
177 MachOSection::S_ATTR_SOME_INSTRUCTIONS);
179 return getSection("__TEXT", "__text");
182 MachOSection *MachOWriter::getBSSSection() {
183 return getSection("__DATA", "__bss", MachOSection::S_ZEROFILL);
186 // GetJTRelocation - Get a relocation a new BB relocation based
187 // on target information.
188 MachineRelocation MachOWriter::GetJTRelocation(unsigned Offset,
189 MachineBasicBlock *MBB) const {
190 return TM.getMachOWriterInfo()->GetJTRelocation(Offset, MBB);
193 // GetTargetRelocation - Returns the number of relocations.
194 unsigned MachOWriter::GetTargetRelocation(MachineRelocation &MR,
195 unsigned FromIdx, unsigned ToAddr,
196 unsigned ToIndex, OutputBuffer &RelocOut,
197 OutputBuffer &SecOut, bool Scattered,
199 return TM.getMachOWriterInfo()->GetTargetRelocation(MR, FromIdx, ToAddr,
205 void MachOWriter::AddSymbolToSection(MachOSection *Sec, GlobalVariable *GV) {
206 const Type *Ty = GV->getType()->getElementType();
207 unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty);
208 unsigned Align = TM.getTargetData()->getPreferredAlignment(GV);
210 // Reserve space in the .bss section for this symbol while maintaining the
211 // desired section alignment, which must be at least as much as required by
213 OutputBuffer SecDataOut(Sec->getData(), is64Bit, isLittleEndian);
216 Align = Log2_32(Align);
217 Sec->align = std::max(unsigned(Sec->align), Align);
219 Sec->emitAlignment(Sec->align);
221 // Globals without external linkage apparently do not go in the symbol table.
222 if (!GV->hasLocalLinkage()) {
223 MachOSym Sym(GV, Mang->getValueName(GV), Sec->Index, TAI);
224 Sym.n_value = Sec->size();
225 SymbolTable.push_back(Sym);
228 // Record the offset of the symbol, and then allocate space for it.
229 // FIXME: remove when we have unified size + output buffer
231 // Now that we know what section the GlovalVariable is going to be emitted
232 // into, update our mappings.
233 // FIXME: We may also need to update this when outputting non-GlobalVariable
234 // GlobalValues such as functions.
237 GVOffset[GV] = Sec->size();
239 // Allocate space in the section for the global.
240 for (unsigned i = 0; i < Size; ++i)
241 SecDataOut.outbyte(0);
244 void MachOWriter::EmitGlobal(GlobalVariable *GV) {
245 const Type *Ty = GV->getType()->getElementType();
246 unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty);
247 bool NoInit = !GV->hasInitializer();
249 // If this global has a zero initializer, it is part of the .bss or common
251 if (NoInit || GV->getInitializer()->isNullValue()) {
252 // If this global is part of the common block, add it now. Variables are
253 // part of the common block if they are zero initialized and allowed to be
254 // merged with other symbols.
255 if (NoInit || GV->hasLinkOnceLinkage() || GV->hasWeakLinkage() ||
256 GV->hasCommonLinkage()) {
257 MachOSym ExtOrCommonSym(GV, Mang->getValueName(GV),
258 MachOSym::NO_SECT, TAI);
259 // For undefined (N_UNDF) external (N_EXT) types, n_value is the size in
260 // bytes of the symbol.
261 ExtOrCommonSym.n_value = Size;
262 SymbolTable.push_back(ExtOrCommonSym);
263 // Remember that we've seen this symbol
267 // Otherwise, this symbol is part of the .bss section.
268 MachOSection *BSS = getBSSSection();
269 AddSymbolToSection(BSS, GV);
273 // Scalar read-only data goes in a literal section if the scalar is 4, 8, or
274 // 16 bytes, or a cstring. Other read only data goes into a regular const
275 // section. Read-write data goes in the data section.
276 MachOSection *Sec = GV->isConstant() ? getConstSection(GV->getInitializer()) :
278 AddSymbolToSection(Sec, GV);
279 InitMem(GV->getInitializer(), GVOffset[GV], TM.getTargetData(), Sec);
284 void MachOWriter::EmitHeaderAndLoadCommands() {
285 // Step #0: Fill in the segment load command size, since we need it to figure
286 // out the rest of the header fields
288 MachOSegment SEG("", is64Bit);
289 SEG.nsects = SectionList.size();
290 SEG.cmdsize = SEG.cmdSize(is64Bit) +
291 SEG.nsects * SectionList[0]->cmdSize(is64Bit);
293 // Step #1: calculate the number of load commands. We always have at least
294 // one, for the LC_SEGMENT load command, plus two for the normal
295 // and dynamic symbol tables, if there are any symbols.
296 Header.ncmds = SymbolTable.empty() ? 1 : 3;
298 // Step #2: calculate the size of the load commands
299 Header.sizeofcmds = SEG.cmdsize;
300 if (!SymbolTable.empty())
301 Header.sizeofcmds += SymTab.cmdsize + DySymTab.cmdsize;
303 // Step #3: write the header to the file
304 // Local alias to shortenify coming code.
305 std::vector<unsigned char> &FH = Header.HeaderData;
306 OutputBuffer FHOut(FH, is64Bit, isLittleEndian);
308 FHOut.outword(Header.magic);
309 FHOut.outword(TM.getMachOWriterInfo()->getCPUType());
310 FHOut.outword(TM.getMachOWriterInfo()->getCPUSubType());
311 FHOut.outword(Header.filetype);
312 FHOut.outword(Header.ncmds);
313 FHOut.outword(Header.sizeofcmds);
314 FHOut.outword(Header.flags);
316 FHOut.outword(Header.reserved);
318 // Step #4: Finish filling in the segment load command and write it out
319 for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
320 E = SectionList.end(); I != E; ++I)
321 SEG.filesize += (*I)->size();
323 SEG.vmsize = SEG.filesize;
324 SEG.fileoff = Header.cmdSize(is64Bit) + Header.sizeofcmds;
326 FHOut.outword(SEG.cmd);
327 FHOut.outword(SEG.cmdsize);
328 FHOut.outstring(SEG.segname, 16);
329 FHOut.outaddr(SEG.vmaddr);
330 FHOut.outaddr(SEG.vmsize);
331 FHOut.outaddr(SEG.fileoff);
332 FHOut.outaddr(SEG.filesize);
333 FHOut.outword(SEG.maxprot);
334 FHOut.outword(SEG.initprot);
335 FHOut.outword(SEG.nsects);
336 FHOut.outword(SEG.flags);
338 // Step #5: Finish filling in the fields of the MachOSections
339 uint64_t currentAddr = 0;
340 for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
341 E = SectionList.end(); I != E; ++I) {
342 MachOSection *MOS = *I;
343 MOS->addr = currentAddr;
344 MOS->offset = currentAddr + SEG.fileoff;
345 // FIXME: do we need to do something with alignment here?
346 currentAddr += MOS->size();
349 // Step #6: Emit the symbol table to temporary buffers, so that we know the
350 // size of the string table when we write the next load command. This also
351 // sorts and assigns indices to each of the symbols, which is necessary for
352 // emitting relocations to externally-defined objects.
353 BufferSymbolAndStringTable();
355 // Step #7: Calculate the number of relocations for each section and write out
356 // the section commands for each section
357 currentAddr += SEG.fileoff;
358 for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
359 E = SectionList.end(); I != E; ++I) {
360 MachOSection *MOS = *I;
362 // Convert the relocations to target-specific relocations, and fill in the
363 // relocation offset for this section.
364 CalculateRelocations(*MOS);
365 MOS->reloff = MOS->nreloc ? currentAddr : 0;
366 currentAddr += MOS->nreloc * 8;
368 // write the finalized section command to the output buffer
369 FHOut.outstring(MOS->sectname, 16);
370 FHOut.outstring(MOS->segname, 16);
371 FHOut.outaddr(MOS->addr);
372 FHOut.outaddr(MOS->size());
373 FHOut.outword(MOS->offset);
374 FHOut.outword(MOS->align);
375 FHOut.outword(MOS->reloff);
376 FHOut.outword(MOS->nreloc);
377 FHOut.outword(MOS->flags);
378 FHOut.outword(MOS->reserved1);
379 FHOut.outword(MOS->reserved2);
381 FHOut.outword(MOS->reserved3);
384 // Step #8: Emit LC_SYMTAB/LC_DYSYMTAB load commands
385 SymTab.symoff = currentAddr;
386 SymTab.nsyms = SymbolTable.size();
387 SymTab.stroff = SymTab.symoff + SymT.size();
388 SymTab.strsize = StrT.size();
389 FHOut.outword(SymTab.cmd);
390 FHOut.outword(SymTab.cmdsize);
391 FHOut.outword(SymTab.symoff);
392 FHOut.outword(SymTab.nsyms);
393 FHOut.outword(SymTab.stroff);
394 FHOut.outword(SymTab.strsize);
396 // FIXME: set DySymTab fields appropriately
397 // We should probably just update these in BufferSymbolAndStringTable since
398 // thats where we're partitioning up the different kinds of symbols.
399 FHOut.outword(DySymTab.cmd);
400 FHOut.outword(DySymTab.cmdsize);
401 FHOut.outword(DySymTab.ilocalsym);
402 FHOut.outword(DySymTab.nlocalsym);
403 FHOut.outword(DySymTab.iextdefsym);
404 FHOut.outword(DySymTab.nextdefsym);
405 FHOut.outword(DySymTab.iundefsym);
406 FHOut.outword(DySymTab.nundefsym);
407 FHOut.outword(DySymTab.tocoff);
408 FHOut.outword(DySymTab.ntoc);
409 FHOut.outword(DySymTab.modtaboff);
410 FHOut.outword(DySymTab.nmodtab);
411 FHOut.outword(DySymTab.extrefsymoff);
412 FHOut.outword(DySymTab.nextrefsyms);
413 FHOut.outword(DySymTab.indirectsymoff);
414 FHOut.outword(DySymTab.nindirectsyms);
415 FHOut.outword(DySymTab.extreloff);
416 FHOut.outword(DySymTab.nextrel);
417 FHOut.outword(DySymTab.locreloff);
418 FHOut.outword(DySymTab.nlocrel);
420 O.write((char*)&FH[0], FH.size());
423 /// EmitSections - Now that we have constructed the file header and load
424 /// commands, emit the data for each section to the file.
425 void MachOWriter::EmitSections() {
426 for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
427 E = SectionList.end(); I != E; ++I)
428 // Emit the contents of each section
430 O.write((char*)&(*I)->getData()[0], (*I)->size());
433 /// EmitRelocations - emit relocation data from buffer.
434 void MachOWriter::EmitRelocations() {
435 for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
436 E = SectionList.end(); I != E; ++I)
437 // Emit the relocation entry data for each section.
438 if ((*I)->RelocBuffer.size())
439 O.write((char*)&(*I)->RelocBuffer[0], (*I)->RelocBuffer.size());
442 /// BufferSymbolAndStringTable - Sort the symbols we encountered and assign them
443 /// each a string table index so that they appear in the correct order in the
445 void MachOWriter::BufferSymbolAndStringTable() {
446 // The order of the symbol table is:
448 // 2. defined external symbols (sorted by name)
449 // 3. undefined external symbols (sorted by name)
451 // Before sorting the symbols, check the PendingGlobals for any undefined
452 // globals that need to be put in the symbol table.
453 for (std::vector<GlobalValue*>::iterator I = PendingGlobals.begin(),
454 E = PendingGlobals.end(); I != E; ++I) {
455 if (GVOffset[*I] == 0 && GVSection[*I] == 0) {
456 MachOSym UndfSym(*I, Mang->getValueName(*I), MachOSym::NO_SECT, TAI);
457 SymbolTable.push_back(UndfSym);
462 // Sort the symbols by name, so that when we partition the symbols by scope
463 // of definition, we won't have to sort by name within each partition.
464 std::sort(SymbolTable.begin(), SymbolTable.end(), MachOSym::SymCmp());
466 // Parition the symbol table entries so that all local symbols come before
467 // all symbols with external linkage. { 1 | 2 3 }
468 std::partition(SymbolTable.begin(), SymbolTable.end(),
469 MachOSym::PartitionByLocal);
471 // Advance iterator to beginning of external symbols and partition so that
472 // all external symbols defined in this module come before all external
473 // symbols defined elsewhere. { 1 | 2 | 3 }
474 for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
475 E = SymbolTable.end(); I != E; ++I) {
476 if (!MachOSym::PartitionByLocal(*I)) {
477 std::partition(I, E, MachOSym::PartitionByDefined);
482 // Calculate the starting index for each of the local, extern defined, and
483 // undefined symbols, as well as the number of each to put in the LC_DYSYMTAB
485 for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
486 E = SymbolTable.end(); I != E; ++I) {
487 if (MachOSym::PartitionByLocal(*I)) {
488 ++DySymTab.nlocalsym;
489 ++DySymTab.iextdefsym;
490 ++DySymTab.iundefsym;
491 } else if (MachOSym::PartitionByDefined(*I)) {
492 ++DySymTab.nextdefsym;
493 ++DySymTab.iundefsym;
495 ++DySymTab.nundefsym;
499 // Write out a leading zero byte when emitting string table, for n_strx == 0
500 // which means an empty string.
501 OutputBuffer StrTOut(StrT, is64Bit, isLittleEndian);
504 // The order of the string table is:
505 // 1. strings for external symbols
506 // 2. strings for local symbols
507 // Since this is the opposite order from the symbol table, which we have just
508 // sorted, we can walk the symbol table backwards to output the string table.
509 for (std::vector<MachOSym>::reverse_iterator I = SymbolTable.rbegin(),
510 E = SymbolTable.rend(); I != E; ++I) {
511 if (I->GVName == "") {
514 I->n_strx = StrT.size();
515 StrTOut.outstring(I->GVName, I->GVName.length()+1);
519 OutputBuffer SymTOut(SymT, is64Bit, isLittleEndian);
522 for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
523 E = SymbolTable.end(); I != E; ++I, ++index) {
524 // Add the section base address to the section offset in the n_value field
525 // to calculate the full address.
526 // FIXME: handle symbols where the n_value field is not the address
527 GlobalValue *GV = const_cast<GlobalValue*>(I->GV);
528 if (GV && GVSection[GV])
529 I->n_value += GVSection[GV]->addr;
530 if (GV && (GVOffset[GV] == -1))
531 GVOffset[GV] = index;
533 // Emit nlist to buffer
534 SymTOut.outword(I->n_strx);
535 SymTOut.outbyte(I->n_type);
536 SymTOut.outbyte(I->n_sect);
537 SymTOut.outhalf(I->n_desc);
538 SymTOut.outaddr(I->n_value);
542 /// CalculateRelocations - For each MachineRelocation in the current section,
543 /// calculate the index of the section containing the object to be relocated,
544 /// and the offset into that section. From this information, create the
545 /// appropriate target-specific MachORelocation type and add buffer it to be
546 /// written out after we are finished writing out sections.
547 void MachOWriter::CalculateRelocations(MachOSection &MOS) {
548 std::vector<MachineRelocation> Relocations = MOS.getRelocations();
549 for (unsigned i = 0, e = Relocations.size(); i != e; ++i) {
550 MachineRelocation &MR = Relocations[i];
551 unsigned TargetSection = MR.getConstantVal();
552 unsigned TargetAddr = 0;
553 unsigned TargetIndex = 0;
555 // This is a scattered relocation entry if it points to a global value with
556 // a non-zero offset.
557 bool Scattered = false;
560 // Since we may not have seen the GlobalValue we were interested in yet at
561 // the time we emitted the relocation for it, fix it up now so that it
562 // points to the offset into the correct section.
563 if (MR.isGlobalValue()) {
564 GlobalValue *GV = MR.getGlobalValue();
565 MachOSection *MOSPtr = GVSection[GV];
566 intptr_t Offset = GVOffset[GV];
568 // If we have never seen the global before, it must be to a symbol
569 // defined in another module (N_UNDF).
571 // FIXME: need to append stub suffix
574 TargetIndex = GVOffset[GV];
576 Scattered = TargetSection != 0;
577 TargetSection = MOSPtr->Index;
579 MR.setResultPointer((void*)Offset);
582 // If the symbol is locally defined, pass in the address of the section and
583 // the section index to the code which will generate the target relocation.
585 MachOSection &To = *SectionList[TargetSection - 1];
586 TargetAddr = To.addr;
587 TargetIndex = To.Index;
590 OutputBuffer RelocOut(MOS.RelocBuffer, is64Bit, isLittleEndian);
591 OutputBuffer SecOut(MOS.getData(), is64Bit, isLittleEndian);
593 MOS.nreloc += GetTargetRelocation(MR, MOS.Index, TargetAddr, TargetIndex,
594 RelocOut, SecOut, Scattered, Extern);
598 // InitMem - Write the value of a Constant to the specified memory location,
599 // converting it into bytes and relocations.
600 void MachOWriter::InitMem(const Constant *C, uintptr_t Offset,
601 const TargetData *TD, MachOSection* mos) {
602 typedef std::pair<const Constant*, intptr_t> CPair;
603 std::vector<CPair> WorkList;
604 uint8_t *Addr = &mos->getData()[0];
606 WorkList.push_back(CPair(C,(intptr_t)Addr + Offset));
608 intptr_t ScatteredOffset = 0;
610 while (!WorkList.empty()) {
611 const Constant *PC = WorkList.back().first;
612 intptr_t PA = WorkList.back().second;
615 if (isa<UndefValue>(PC)) {
617 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(PC)) {
618 unsigned ElementSize =
619 TD->getTypeAllocSize(CP->getType()->getElementType());
620 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
621 WorkList.push_back(CPair(CP->getOperand(i), PA+i*ElementSize));
622 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(PC)) {
624 // FIXME: Handle ConstantExpression. See EE::getConstantValue()
626 switch (CE->getOpcode()) {
627 case Instruction::GetElementPtr: {
628 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
629 ScatteredOffset = TD->getIndexedOffset(CE->getOperand(0)->getType(),
630 &Indices[0], Indices.size());
631 WorkList.push_back(CPair(CE->getOperand(0), PA));
634 case Instruction::Add:
636 cerr << "ConstantExpr not handled as global var init: " << *CE << "\n";
640 } else if (PC->getType()->isSingleValueType()) {
641 unsigned char *ptr = (unsigned char *)PA;
642 switch (PC->getType()->getTypeID()) {
643 case Type::IntegerTyID: {
644 unsigned NumBits = cast<IntegerType>(PC->getType())->getBitWidth();
645 uint64_t val = cast<ConstantInt>(PC)->getZExtValue();
648 else if (NumBits <= 16) {
649 if (TD->isBigEndian())
650 val = ByteSwap_16(val);
653 } else if (NumBits <= 32) {
654 if (TD->isBigEndian())
655 val = ByteSwap_32(val);
660 } else if (NumBits <= 64) {
661 if (TD->isBigEndian())
662 val = ByteSwap_64(val);
672 assert(0 && "Not implemented: bit widths > 64");
676 case Type::FloatTyID: {
677 uint32_t val = cast<ConstantFP>(PC)->getValueAPF().bitcastToAPInt().
679 if (TD->isBigEndian())
680 val = ByteSwap_32(val);
687 case Type::DoubleTyID: {
688 uint64_t val = cast<ConstantFP>(PC)->getValueAPF().bitcastToAPInt().
690 if (TD->isBigEndian())
691 val = ByteSwap_64(val);
702 case Type::PointerTyID:
703 if (isa<ConstantPointerNull>(PC))
704 memset(ptr, 0, TD->getPointerSize());
705 else if (const GlobalValue* GV = dyn_cast<GlobalValue>(PC)) {
706 // FIXME: what about function stubs?
707 mos->addRelocation(MachineRelocation::getGV(PA-(intptr_t)Addr,
708 MachineRelocation::VANILLA,
709 const_cast<GlobalValue*>(GV),
713 assert(0 && "Unknown constant pointer type!");
716 cerr << "ERROR: Constant unimp for type: " << *PC->getType() << "\n";
719 } else if (isa<ConstantAggregateZero>(PC)) {
720 memset((void*)PA, 0, (size_t)TD->getTypeAllocSize(PC->getType()));
721 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(PC)) {
722 unsigned ElementSize =
723 TD->getTypeAllocSize(CPA->getType()->getElementType());
724 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
725 WorkList.push_back(CPair(CPA->getOperand(i), PA+i*ElementSize));
726 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(PC)) {
727 const StructLayout *SL =
728 TD->getStructLayout(cast<StructType>(CPS->getType()));
729 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
730 WorkList.push_back(CPair(CPS->getOperand(i),
731 PA+SL->getElementOffset(i)));
733 cerr << "Bad Type: " << *PC->getType() << "\n";
734 assert(0 && "Unknown constant type to initialize memory with!");
739 //===----------------------------------------------------------------------===//
740 // MachOSym Implementation
741 //===----------------------------------------------------------------------===//
743 MachOSym::MachOSym(const GlobalValue *gv, std::string name, uint8_t sect,
744 const TargetAsmInfo *TAI) :
745 GV(gv), n_strx(0), n_type(sect == NO_SECT ? N_UNDF : N_SECT), n_sect(sect),
746 n_desc(0), n_value(0) {
748 switch (GV->getLinkage()) {
750 assert(0 && "Unexpected linkage type!");
752 case GlobalValue::WeakAnyLinkage:
753 case GlobalValue::WeakODRLinkage:
754 case GlobalValue::LinkOnceAnyLinkage:
755 case GlobalValue::LinkOnceODRLinkage:
756 case GlobalValue::CommonLinkage:
757 assert(!isa<Function>(gv) && "Unexpected linkage type for Function!");
758 case GlobalValue::ExternalLinkage:
759 GVName = TAI->getGlobalPrefix() + name;
760 n_type |= GV->hasHiddenVisibility() ? N_PEXT : N_EXT;
762 case GlobalValue::PrivateLinkage:
763 GVName = TAI->getPrivateGlobalPrefix() + name;
765 case GlobalValue::InternalLinkage:
766 GVName = TAI->getGlobalPrefix() + name;
771 } // end namespace llvm