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/MC/MCAsmInfo.h"
33 #include "llvm/Target/TargetData.h"
34 #include "llvm/Target/TargetMachine.h"
35 #include "llvm/Target/TargetMachOWriterInfo.h"
36 #include "llvm/Support/Debug.h"
37 #include "llvm/Support/Mangler.h"
38 #include "llvm/Support/OutputBuffer.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/raw_ostream.h"
44 /// AddMachOWriter - Concrete function to add the Mach-O writer to the function
46 ObjectCodeEmitter *AddMachOWriter(PassManagerBase &PM,
49 MachOWriter *MOW = new MachOWriter(O, TM);
51 return MOW->getObjectCodeEmitter();
54 //===----------------------------------------------------------------------===//
55 // MachOWriter Implementation
56 //===----------------------------------------------------------------------===//
58 char MachOWriter::ID = 0;
60 MachOWriter::MachOWriter(raw_ostream &o, TargetMachine &tm)
61 : MachineFunctionPass(&ID), O(o), TM(tm) {
62 is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
63 isLittleEndian = TM.getTargetData()->isLittleEndian();
65 MAI = TM.getMCAsmInfo();
67 // Create the machine code emitter object for this target.
68 MachOCE = new MachOCodeEmitter(*this, *getTextSection(true));
71 MachOWriter::~MachOWriter() {
75 bool MachOWriter::doInitialization(Module &M) {
76 // Set the magic value, now that we know the pointer size and endianness
77 Header.setMagic(isLittleEndian, is64Bit);
80 // FIXME: this only works for object files, we do not support the creation
81 // of dynamic libraries or executables at this time.
82 Header.filetype = MachOHeader::MH_OBJECT;
84 Mang = new Mangler(M);
88 bool MachOWriter::runOnMachineFunction(MachineFunction &MF) {
92 /// doFinalization - Now that the module has been completely processed, emit
93 /// the Mach-O file to 'O'.
94 bool MachOWriter::doFinalization(Module &M) {
95 // FIXME: we don't handle debug info yet, we should probably do that.
96 // Okay, the.text section has been completed, build the .data, .bss, and
97 // "common" sections next.
99 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
103 // Emit the header and load commands.
104 EmitHeaderAndLoadCommands();
106 // Emit the various sections and their relocation info.
110 // Write the symbol table and the string table to the end of the file.
111 O.write((char*)&SymT[0], SymT.size());
112 O.write((char*)&StrT[0], StrT.size());
114 // We are done with the abstract symbols.
117 DynamicSymbolTable.clear();
119 // Release the name mangler object.
120 delete Mang; Mang = 0;
124 // getConstSection - Get constant section for Constant 'C'
125 MachOSection *MachOWriter::getConstSection(Constant *C) {
126 const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
127 if (CVA && CVA->isCString())
128 return getSection("__TEXT", "__cstring",
129 MachOSection::S_CSTRING_LITERALS);
131 const Type *Ty = C->getType();
132 if (Ty->isPrimitiveType() || Ty->isInteger()) {
133 unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty);
135 default: break; // Fall through to __TEXT,__const
137 return getSection("__TEXT", "__literal4",
138 MachOSection::S_4BYTE_LITERALS);
140 return getSection("__TEXT", "__literal8",
141 MachOSection::S_8BYTE_LITERALS);
143 return getSection("__TEXT", "__literal16",
144 MachOSection::S_16BYTE_LITERALS);
147 return getSection("__TEXT", "__const");
150 // getJumpTableSection - Select the Jump Table section
151 MachOSection *MachOWriter::getJumpTableSection() {
152 if (TM.getRelocationModel() == Reloc::PIC_)
153 return getTextSection(false);
155 return getSection("__TEXT", "__const");
158 // getSection - Return the section with the specified name, creating a new
159 // section if one does not already exist.
160 MachOSection *MachOWriter::getSection(const std::string &seg,
161 const std::string §,
162 unsigned Flags /* = 0 */ ) {
163 MachOSection *MOS = SectionLookup[seg+sect];
166 MOS = new MachOSection(seg, sect);
167 SectionList.push_back(MOS);
168 MOS->Index = SectionList.size();
169 MOS->flags = MachOSection::S_REGULAR | Flags;
170 SectionLookup[seg+sect] = MOS;
174 // getTextSection - Return text section with different flags for code/data
175 MachOSection *MachOWriter::getTextSection(bool isCode /* = true */ ) {
177 return getSection("__TEXT", "__text",
178 MachOSection::S_ATTR_PURE_INSTRUCTIONS |
179 MachOSection::S_ATTR_SOME_INSTRUCTIONS);
181 return getSection("__TEXT", "__text");
184 MachOSection *MachOWriter::getBSSSection() {
185 return getSection("__DATA", "__bss", MachOSection::S_ZEROFILL);
188 // GetJTRelocation - Get a relocation a new BB relocation based
189 // on target information.
190 MachineRelocation MachOWriter::GetJTRelocation(unsigned Offset,
191 MachineBasicBlock *MBB) const {
192 return TM.getMachOWriterInfo()->GetJTRelocation(Offset, MBB);
195 // GetTargetRelocation - Returns the number of relocations.
196 unsigned MachOWriter::GetTargetRelocation(MachineRelocation &MR,
197 unsigned FromIdx, unsigned ToAddr,
198 unsigned ToIndex, OutputBuffer &RelocOut,
199 OutputBuffer &SecOut, bool Scattered,
201 return TM.getMachOWriterInfo()->GetTargetRelocation(MR, FromIdx, ToAddr,
207 void MachOWriter::AddSymbolToSection(MachOSection *Sec, GlobalVariable *GV) {
208 const Type *Ty = GV->getType()->getElementType();
209 unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty);
210 unsigned Align = TM.getTargetData()->getPreferredAlignment(GV);
212 // Reserve space in the .bss section for this symbol while maintaining the
213 // desired section alignment, which must be at least as much as required by
215 OutputBuffer SecDataOut(Sec->getData(), is64Bit, isLittleEndian);
218 Align = Log2_32(Align);
219 Sec->align = std::max(unsigned(Sec->align), Align);
221 Sec->emitAlignment(Sec->align);
223 // Globals without external linkage apparently do not go in the symbol table.
224 if (!GV->hasLocalLinkage()) {
225 MachOSym Sym(GV, Mang->getMangledName(GV), Sec->Index, MAI);
226 Sym.n_value = Sec->size();
227 SymbolTable.push_back(Sym);
230 // Record the offset of the symbol, and then allocate space for it.
231 // FIXME: remove when we have unified size + output buffer
233 // Now that we know what section the GlovalVariable is going to be emitted
234 // into, update our mappings.
235 // FIXME: We may also need to update this when outputting non-GlobalVariable
236 // GlobalValues such as functions.
239 GVOffset[GV] = Sec->size();
241 // Allocate space in the section for the global.
242 for (unsigned i = 0; i < Size; ++i)
243 SecDataOut.outbyte(0);
246 void MachOWriter::EmitGlobal(GlobalVariable *GV) {
247 const Type *Ty = GV->getType()->getElementType();
248 unsigned Size = TM.getTargetData()->getTypeAllocSize(Ty);
249 bool NoInit = !GV->hasInitializer();
251 // If this global has a zero initializer, it is part of the .bss or common
253 if (NoInit || GV->getInitializer()->isNullValue()) {
254 // If this global is part of the common block, add it now. Variables are
255 // part of the common block if they are zero initialized and allowed to be
256 // merged with other symbols.
257 if (NoInit || GV->hasLinkOnceLinkage() || GV->hasWeakLinkage() ||
258 GV->hasCommonLinkage()) {
259 MachOSym ExtOrCommonSym(GV, Mang->getMangledName(GV),
260 MachOSym::NO_SECT, MAI);
261 // For undefined (N_UNDF) external (N_EXT) types, n_value is the size in
262 // bytes of the symbol.
263 ExtOrCommonSym.n_value = Size;
264 SymbolTable.push_back(ExtOrCommonSym);
265 // Remember that we've seen this symbol
269 // Otherwise, this symbol is part of the .bss section.
270 MachOSection *BSS = getBSSSection();
271 AddSymbolToSection(BSS, GV);
275 // Scalar read-only data goes in a literal section if the scalar is 4, 8, or
276 // 16 bytes, or a cstring. Other read only data goes into a regular const
277 // section. Read-write data goes in the data section.
278 MachOSection *Sec = GV->isConstant() ? getConstSection(GV->getInitializer()) :
280 AddSymbolToSection(Sec, GV);
281 InitMem(GV->getInitializer(), GVOffset[GV], TM.getTargetData(), Sec);
286 void MachOWriter::EmitHeaderAndLoadCommands() {
287 // Step #0: Fill in the segment load command size, since we need it to figure
288 // out the rest of the header fields
290 MachOSegment SEG("", is64Bit);
291 SEG.nsects = SectionList.size();
292 SEG.cmdsize = SEG.cmdSize(is64Bit) +
293 SEG.nsects * SectionList[0]->cmdSize(is64Bit);
295 // Step #1: calculate the number of load commands. We always have at least
296 // one, for the LC_SEGMENT load command, plus two for the normal
297 // and dynamic symbol tables, if there are any symbols.
298 Header.ncmds = SymbolTable.empty() ? 1 : 3;
300 // Step #2: calculate the size of the load commands
301 Header.sizeofcmds = SEG.cmdsize;
302 if (!SymbolTable.empty())
303 Header.sizeofcmds += SymTab.cmdsize + DySymTab.cmdsize;
305 // Step #3: write the header to the file
306 // Local alias to shortenify coming code.
307 std::vector<unsigned char> &FH = Header.HeaderData;
308 OutputBuffer FHOut(FH, is64Bit, isLittleEndian);
310 FHOut.outword(Header.magic);
311 FHOut.outword(TM.getMachOWriterInfo()->getCPUType());
312 FHOut.outword(TM.getMachOWriterInfo()->getCPUSubType());
313 FHOut.outword(Header.filetype);
314 FHOut.outword(Header.ncmds);
315 FHOut.outword(Header.sizeofcmds);
316 FHOut.outword(Header.flags);
318 FHOut.outword(Header.reserved);
320 // Step #4: Finish filling in the segment load command and write it out
321 for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
322 E = SectionList.end(); I != E; ++I)
323 SEG.filesize += (*I)->size();
325 SEG.vmsize = SEG.filesize;
326 SEG.fileoff = Header.cmdSize(is64Bit) + Header.sizeofcmds;
328 FHOut.outword(SEG.cmd);
329 FHOut.outword(SEG.cmdsize);
330 FHOut.outstring(SEG.segname, 16);
331 FHOut.outaddr(SEG.vmaddr);
332 FHOut.outaddr(SEG.vmsize);
333 FHOut.outaddr(SEG.fileoff);
334 FHOut.outaddr(SEG.filesize);
335 FHOut.outword(SEG.maxprot);
336 FHOut.outword(SEG.initprot);
337 FHOut.outword(SEG.nsects);
338 FHOut.outword(SEG.flags);
340 // Step #5: Finish filling in the fields of the MachOSections
341 uint64_t currentAddr = 0;
342 for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
343 E = SectionList.end(); I != E; ++I) {
344 MachOSection *MOS = *I;
345 MOS->addr = currentAddr;
346 MOS->offset = currentAddr + SEG.fileoff;
347 // FIXME: do we need to do something with alignment here?
348 currentAddr += MOS->size();
351 // Step #6: Emit the symbol table to temporary buffers, so that we know the
352 // size of the string table when we write the next load command. This also
353 // sorts and assigns indices to each of the symbols, which is necessary for
354 // emitting relocations to externally-defined objects.
355 BufferSymbolAndStringTable();
357 // Step #7: Calculate the number of relocations for each section and write out
358 // the section commands for each section
359 currentAddr += SEG.fileoff;
360 for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
361 E = SectionList.end(); I != E; ++I) {
362 MachOSection *MOS = *I;
364 // Convert the relocations to target-specific relocations, and fill in the
365 // relocation offset for this section.
366 CalculateRelocations(*MOS);
367 MOS->reloff = MOS->nreloc ? currentAddr : 0;
368 currentAddr += MOS->nreloc * 8;
370 // write the finalized section command to the output buffer
371 FHOut.outstring(MOS->sectname, 16);
372 FHOut.outstring(MOS->segname, 16);
373 FHOut.outaddr(MOS->addr);
374 FHOut.outaddr(MOS->size());
375 FHOut.outword(MOS->offset);
376 FHOut.outword(MOS->align);
377 FHOut.outword(MOS->reloff);
378 FHOut.outword(MOS->nreloc);
379 FHOut.outword(MOS->flags);
380 FHOut.outword(MOS->reserved1);
381 FHOut.outword(MOS->reserved2);
383 FHOut.outword(MOS->reserved3);
386 // Step #8: Emit LC_SYMTAB/LC_DYSYMTAB load commands
387 SymTab.symoff = currentAddr;
388 SymTab.nsyms = SymbolTable.size();
389 SymTab.stroff = SymTab.symoff + SymT.size();
390 SymTab.strsize = StrT.size();
391 FHOut.outword(SymTab.cmd);
392 FHOut.outword(SymTab.cmdsize);
393 FHOut.outword(SymTab.symoff);
394 FHOut.outword(SymTab.nsyms);
395 FHOut.outword(SymTab.stroff);
396 FHOut.outword(SymTab.strsize);
398 // FIXME: set DySymTab fields appropriately
399 // We should probably just update these in BufferSymbolAndStringTable since
400 // thats where we're partitioning up the different kinds of symbols.
401 FHOut.outword(DySymTab.cmd);
402 FHOut.outword(DySymTab.cmdsize);
403 FHOut.outword(DySymTab.ilocalsym);
404 FHOut.outword(DySymTab.nlocalsym);
405 FHOut.outword(DySymTab.iextdefsym);
406 FHOut.outword(DySymTab.nextdefsym);
407 FHOut.outword(DySymTab.iundefsym);
408 FHOut.outword(DySymTab.nundefsym);
409 FHOut.outword(DySymTab.tocoff);
410 FHOut.outword(DySymTab.ntoc);
411 FHOut.outword(DySymTab.modtaboff);
412 FHOut.outword(DySymTab.nmodtab);
413 FHOut.outword(DySymTab.extrefsymoff);
414 FHOut.outword(DySymTab.nextrefsyms);
415 FHOut.outword(DySymTab.indirectsymoff);
416 FHOut.outword(DySymTab.nindirectsyms);
417 FHOut.outword(DySymTab.extreloff);
418 FHOut.outword(DySymTab.nextrel);
419 FHOut.outword(DySymTab.locreloff);
420 FHOut.outword(DySymTab.nlocrel);
422 O.write((char*)&FH[0], FH.size());
425 /// EmitSections - Now that we have constructed the file header and load
426 /// commands, emit the data for each section to the file.
427 void MachOWriter::EmitSections() {
428 for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
429 E = SectionList.end(); I != E; ++I)
430 // Emit the contents of each section
432 O.write((char*)&(*I)->getData()[0], (*I)->size());
435 /// EmitRelocations - emit relocation data from buffer.
436 void MachOWriter::EmitRelocations() {
437 for (std::vector<MachOSection*>::iterator I = SectionList.begin(),
438 E = SectionList.end(); I != E; ++I)
439 // Emit the relocation entry data for each section.
440 if ((*I)->RelocBuffer.size())
441 O.write((char*)&(*I)->RelocBuffer[0], (*I)->RelocBuffer.size());
444 /// BufferSymbolAndStringTable - Sort the symbols we encountered and assign them
445 /// each a string table index so that they appear in the correct order in the
447 void MachOWriter::BufferSymbolAndStringTable() {
448 // The order of the symbol table is:
450 // 2. defined external symbols (sorted by name)
451 // 3. undefined external symbols (sorted by name)
453 // Before sorting the symbols, check the PendingGlobals for any undefined
454 // globals that need to be put in the symbol table.
455 for (std::vector<GlobalValue*>::iterator I = PendingGlobals.begin(),
456 E = PendingGlobals.end(); I != E; ++I) {
457 if (GVOffset[*I] == 0 && GVSection[*I] == 0) {
458 MachOSym UndfSym(*I, Mang->getMangledName(*I), MachOSym::NO_SECT, MAI);
459 SymbolTable.push_back(UndfSym);
464 // Sort the symbols by name, so that when we partition the symbols by scope
465 // of definition, we won't have to sort by name within each partition.
466 std::sort(SymbolTable.begin(), SymbolTable.end(), MachOSym::SymCmp());
468 // Parition the symbol table entries so that all local symbols come before
469 // all symbols with external linkage. { 1 | 2 3 }
470 std::partition(SymbolTable.begin(), SymbolTable.end(),
471 MachOSym::PartitionByLocal);
473 // Advance iterator to beginning of external symbols and partition so that
474 // all external symbols defined in this module come before all external
475 // symbols defined elsewhere. { 1 | 2 | 3 }
476 for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
477 E = SymbolTable.end(); I != E; ++I) {
478 if (!MachOSym::PartitionByLocal(*I)) {
479 std::partition(I, E, MachOSym::PartitionByDefined);
484 // Calculate the starting index for each of the local, extern defined, and
485 // undefined symbols, as well as the number of each to put in the LC_DYSYMTAB
487 for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
488 E = SymbolTable.end(); I != E; ++I) {
489 if (MachOSym::PartitionByLocal(*I)) {
490 ++DySymTab.nlocalsym;
491 ++DySymTab.iextdefsym;
492 ++DySymTab.iundefsym;
493 } else if (MachOSym::PartitionByDefined(*I)) {
494 ++DySymTab.nextdefsym;
495 ++DySymTab.iundefsym;
497 ++DySymTab.nundefsym;
501 // Write out a leading zero byte when emitting string table, for n_strx == 0
502 // which means an empty string.
503 OutputBuffer StrTOut(StrT, is64Bit, isLittleEndian);
506 // The order of the string table is:
507 // 1. strings for external symbols
508 // 2. strings for local symbols
509 // Since this is the opposite order from the symbol table, which we have just
510 // sorted, we can walk the symbol table backwards to output the string table.
511 for (std::vector<MachOSym>::reverse_iterator I = SymbolTable.rbegin(),
512 E = SymbolTable.rend(); I != E; ++I) {
513 if (I->GVName == "") {
516 I->n_strx = StrT.size();
517 StrTOut.outstring(I->GVName, I->GVName.length()+1);
521 OutputBuffer SymTOut(SymT, is64Bit, isLittleEndian);
524 for (std::vector<MachOSym>::iterator I = SymbolTable.begin(),
525 E = SymbolTable.end(); I != E; ++I, ++index) {
526 // Add the section base address to the section offset in the n_value field
527 // to calculate the full address.
528 // FIXME: handle symbols where the n_value field is not the address
529 GlobalValue *GV = const_cast<GlobalValue*>(I->GV);
530 if (GV && GVSection[GV])
531 I->n_value += GVSection[GV]->addr;
532 if (GV && (GVOffset[GV] == -1))
533 GVOffset[GV] = index;
535 // Emit nlist to buffer
536 SymTOut.outword(I->n_strx);
537 SymTOut.outbyte(I->n_type);
538 SymTOut.outbyte(I->n_sect);
539 SymTOut.outhalf(I->n_desc);
540 SymTOut.outaddr(I->n_value);
544 /// CalculateRelocations - For each MachineRelocation in the current section,
545 /// calculate the index of the section containing the object to be relocated,
546 /// and the offset into that section. From this information, create the
547 /// appropriate target-specific MachORelocation type and add buffer it to be
548 /// written out after we are finished writing out sections.
549 void MachOWriter::CalculateRelocations(MachOSection &MOS) {
550 std::vector<MachineRelocation> Relocations = MOS.getRelocations();
551 for (unsigned i = 0, e = Relocations.size(); i != e; ++i) {
552 MachineRelocation &MR = Relocations[i];
553 unsigned TargetSection = MR.getConstantVal();
554 unsigned TargetAddr = 0;
555 unsigned TargetIndex = 0;
557 // This is a scattered relocation entry if it points to a global value with
558 // a non-zero offset.
559 bool Scattered = false;
562 // Since we may not have seen the GlobalValue we were interested in yet at
563 // the time we emitted the relocation for it, fix it up now so that it
564 // points to the offset into the correct section.
565 if (MR.isGlobalValue()) {
566 GlobalValue *GV = MR.getGlobalValue();
567 MachOSection *MOSPtr = GVSection[GV];
568 intptr_t Offset = GVOffset[GV];
570 // If we have never seen the global before, it must be to a symbol
571 // defined in another module (N_UNDF).
573 // FIXME: need to append stub suffix
576 TargetIndex = GVOffset[GV];
578 Scattered = TargetSection != 0;
579 TargetSection = MOSPtr->Index;
581 MR.setResultPointer((void*)Offset);
584 // If the symbol is locally defined, pass in the address of the section and
585 // the section index to the code which will generate the target relocation.
587 MachOSection &To = *SectionList[TargetSection - 1];
588 TargetAddr = To.addr;
589 TargetIndex = To.Index;
592 OutputBuffer RelocOut(MOS.RelocBuffer, is64Bit, isLittleEndian);
593 OutputBuffer SecOut(MOS.getData(), is64Bit, isLittleEndian);
595 MOS.nreloc += GetTargetRelocation(MR, MOS.Index, TargetAddr, TargetIndex,
596 RelocOut, SecOut, Scattered, Extern);
600 // InitMem - Write the value of a Constant to the specified memory location,
601 // converting it into bytes and relocations.
602 void MachOWriter::InitMem(const Constant *C, uintptr_t Offset,
603 const TargetData *TD, MachOSection* mos) {
604 typedef std::pair<const Constant*, intptr_t> CPair;
605 std::vector<CPair> WorkList;
606 uint8_t *Addr = &mos->getData()[0];
608 WorkList.push_back(CPair(C,(intptr_t)Addr + Offset));
610 intptr_t ScatteredOffset = 0;
612 while (!WorkList.empty()) {
613 const Constant *PC = WorkList.back().first;
614 intptr_t PA = WorkList.back().second;
617 if (isa<UndefValue>(PC)) {
619 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(PC)) {
620 unsigned ElementSize =
621 TD->getTypeAllocSize(CP->getType()->getElementType());
622 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
623 WorkList.push_back(CPair(CP->getOperand(i), PA+i*ElementSize));
624 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(PC)) {
626 // FIXME: Handle ConstantExpression. See EE::getConstantValue()
628 switch (CE->getOpcode()) {
629 case Instruction::GetElementPtr: {
630 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
631 ScatteredOffset = TD->getIndexedOffset(CE->getOperand(0)->getType(),
632 &Indices[0], Indices.size());
633 WorkList.push_back(CPair(CE->getOperand(0), PA));
636 case Instruction::Add:
638 dbgs() << "ConstantExpr not handled as global var init: " << *CE <<"\n";
641 } else if (PC->getType()->isSingleValueType()) {
642 unsigned char *ptr = (unsigned char *)PA;
643 switch (PC->getType()->getTypeID()) {
644 case Type::IntegerTyID: {
645 unsigned NumBits = cast<IntegerType>(PC->getType())->getBitWidth();
646 uint64_t val = cast<ConstantInt>(PC)->getZExtValue();
649 else if (NumBits <= 16) {
650 if (TD->isBigEndian())
651 val = ByteSwap_16(val);
654 } else if (NumBits <= 32) {
655 if (TD->isBigEndian())
656 val = ByteSwap_32(val);
661 } else if (NumBits <= 64) {
662 if (TD->isBigEndian())
663 val = ByteSwap_64(val);
673 llvm_unreachable("Not implemented: bit widths > 64");
677 case Type::FloatTyID: {
678 uint32_t val = cast<ConstantFP>(PC)->getValueAPF().bitcastToAPInt().
680 if (TD->isBigEndian())
681 val = ByteSwap_32(val);
688 case Type::DoubleTyID: {
689 uint64_t val = cast<ConstantFP>(PC)->getValueAPF().bitcastToAPInt().
691 if (TD->isBigEndian())
692 val = ByteSwap_64(val);
703 case Type::PointerTyID:
704 if (isa<ConstantPointerNull>(PC))
705 memset(ptr, 0, TD->getPointerSize());
706 else if (const GlobalValue* GV = dyn_cast<GlobalValue>(PC)) {
707 // FIXME: what about function stubs?
708 mos->addRelocation(MachineRelocation::getGV(PA-(intptr_t)Addr,
709 MachineRelocation::VANILLA,
710 const_cast<GlobalValue*>(GV),
714 llvm_unreachable("Unknown constant pointer type!");
718 raw_string_ostream Msg(msg);
719 Msg << "ERROR: Constant unimp for type: " << *PC->getType();
720 llvm_report_error(Msg.str());
722 } else if (isa<ConstantAggregateZero>(PC)) {
723 memset((void*)PA, 0, (size_t)TD->getTypeAllocSize(PC->getType()));
724 } else if (const ConstantArray *CPA = dyn_cast<ConstantArray>(PC)) {
725 unsigned ElementSize =
726 TD->getTypeAllocSize(CPA->getType()->getElementType());
727 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
728 WorkList.push_back(CPair(CPA->getOperand(i), PA+i*ElementSize));
729 } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(PC)) {
730 const StructLayout *SL =
731 TD->getStructLayout(cast<StructType>(CPS->getType()));
732 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
733 WorkList.push_back(CPair(CPS->getOperand(i),
734 PA+SL->getElementOffset(i)));
736 dbgs() << "Bad Type: " << *PC->getType() << "\n";
737 llvm_unreachable("Unknown constant type to initialize memory with!");
742 //===----------------------------------------------------------------------===//
743 // MachOSym Implementation
744 //===----------------------------------------------------------------------===//
746 MachOSym::MachOSym(const GlobalValue *gv, std::string name, uint8_t sect,
747 const MCAsmInfo *MAI) :
748 GV(gv), n_strx(0), n_type(sect == NO_SECT ? N_UNDF : N_SECT), n_sect(sect),
749 n_desc(0), n_value(0) {
751 // FIXME: This is completely broken, it should use the mangler interface.
752 switch (GV->getLinkage()) {
754 llvm_unreachable("Unexpected linkage type!");
756 case GlobalValue::WeakAnyLinkage:
757 case GlobalValue::WeakODRLinkage:
758 case GlobalValue::LinkOnceAnyLinkage:
759 case GlobalValue::LinkOnceODRLinkage:
760 case GlobalValue::CommonLinkage:
761 assert(!isa<Function>(gv) && "Unexpected linkage type for Function!");
762 case GlobalValue::ExternalLinkage:
763 GVName = MAI->getGlobalPrefix() + name;
764 n_type |= GV->hasHiddenVisibility() ? N_PEXT : N_EXT;
766 case GlobalValue::PrivateLinkage:
767 GVName = MAI->getPrivateGlobalPrefix() + name;
769 case GlobalValue::LinkerPrivateLinkage:
770 GVName = MAI->getLinkerPrivateGlobalPrefix() + name;
772 case GlobalValue::InternalLinkage:
773 GVName = MAI->getGlobalPrefix() + name;
778 } // end namespace llvm