1 //===-- X86AsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly --------===//
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 contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to AT&T format assembly
12 // language. This printer is the output mechanism used by `llc'.
14 //===----------------------------------------------------------------------===//
16 #define DEBUG_TYPE "asm-printer"
17 #include "X86AsmPrinter.h"
18 #include "X86ATTInstPrinter.h"
19 #include "X86IntelInstPrinter.h"
20 #include "X86MCInstLower.h"
23 #include "X86COFFMachineModuleInfo.h"
24 #include "X86MachineFunctionInfo.h"
25 #include "X86TargetMachine.h"
26 #include "llvm/CallingConv.h"
27 #include "llvm/DerivedTypes.h"
28 #include "llvm/Module.h"
29 #include "llvm/Type.h"
30 #include "llvm/Assembly/Writer.h"
31 #include "llvm/MC/MCContext.h"
32 #include "llvm/MC/MCSectionMachO.h"
33 #include "llvm/MC/MCStreamer.h"
34 #include "llvm/MC/MCSymbol.h"
35 #include "llvm/CodeGen/MachineJumpTableInfo.h"
36 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
37 #include "llvm/Support/ErrorHandling.h"
38 #include "llvm/Support/FormattedStream.h"
39 #include "llvm/MC/MCAsmInfo.h"
40 #include "llvm/Target/TargetLoweringObjectFile.h"
41 #include "llvm/Target/TargetOptions.h"
42 #include "llvm/Target/TargetRegistry.h"
43 #include "llvm/ADT/SmallString.h"
44 #include "llvm/ADT/Statistic.h"
47 STATISTIC(EmittedInsts, "Number of machine instrs printed");
49 //===----------------------------------------------------------------------===//
50 // Primitive Helper Functions.
51 //===----------------------------------------------------------------------===//
53 void X86AsmPrinter::printMCInst(const MCInst *MI) {
54 if (MAI->getAssemblerDialect() == 0)
55 X86ATTInstPrinter(O, *MAI).printInstruction(MI);
57 X86IntelInstPrinter(O, *MAI).printInstruction(MI);
60 void X86AsmPrinter::PrintPICBaseSymbol() const {
61 // FIXME: Gross const cast hack.
62 X86AsmPrinter *AP = const_cast<X86AsmPrinter*>(this);
63 O << *X86MCInstLower(OutContext, 0, *AP).GetPICBaseSymbol();
66 void X86AsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
67 unsigned FnAlign = MF.getAlignment();
68 const Function *F = MF.getFunction();
70 if (Subtarget->isTargetCygMing()) {
71 X86COFFMachineModuleInfo &COFFMMI =
72 MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
73 COFFMMI.DecorateCygMingName(CurrentFnSym, OutContext, F,
77 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
78 EmitAlignment(FnAlign, F);
80 switch (F->getLinkage()) {
81 default: llvm_unreachable("Unknown linkage type!");
82 case Function::InternalLinkage: // Symbols default to internal.
83 case Function::PrivateLinkage:
85 case Function::DLLExportLinkage:
86 case Function::ExternalLinkage:
87 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_Global);
89 case Function::LinkerPrivateLinkage:
90 case Function::LinkOnceAnyLinkage:
91 case Function::LinkOnceODRLinkage:
92 case Function::WeakAnyLinkage:
93 case Function::WeakODRLinkage:
94 if (Subtarget->isTargetDarwin()) {
95 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_Global);
96 O << MAI->getWeakDefDirective() << *CurrentFnSym << '\n';
97 } else if (Subtarget->isTargetCygMing()) {
98 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_Global);
99 // FIXME: linkonce should be a section attribute, handled by COFF Section
101 // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
102 O << "\t.linkonce discard\n";
104 O << "\t.weak\t" << *CurrentFnSym << '\n';
109 printVisibility(CurrentFnSym, F->getVisibility());
111 if (MAI->hasDotTypeDotSizeDirective()) {
112 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
113 } else if (Subtarget->isTargetCygMing()) {
114 O << "\t.def\t " << *CurrentFnSym;
116 (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
117 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
121 O << *CurrentFnSym << ':';
123 O.PadToColumn(MAI->getCommentColumn());
124 O << MAI->getCommentString() << ' ';
125 WriteAsOperand(O, F, /*PrintType=*/false, F->getParent());
129 // Add some workaround for linkonce linkage on Cygwin\MinGW
130 if (Subtarget->isTargetCygMing() &&
131 (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
132 O << "Lllvm$workaround$fake$stub$" << *CurrentFnSym << ":\n";
135 /// runOnMachineFunction - This uses the printMachineInstruction()
136 /// method to print assembly for each instruction.
138 bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
139 const Function *F = MF.getFunction();
141 CallingConv::ID CC = F->getCallingConv();
143 SetupMachineFunction(MF);
146 if (Subtarget->isTargetCOFF()) {
147 X86COFFMachineModuleInfo &COFFMMI =
148 MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
150 // Populate function information map. Don't want to populate
151 // non-stdcall or non-fastcall functions' information right now.
152 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
153 COFFMMI.AddFunctionInfo(F, *MF.getInfo<X86MachineFunctionInfo>());
156 // Print out constants referenced by the function
157 EmitConstantPool(MF.getConstantPool());
159 // Print the 'header' of function
160 emitFunctionHeader(MF);
162 // Emit pre-function debug and/or EH information.
163 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
164 DW->BeginFunction(&MF);
166 // Print out code for the function.
167 bool hasAnyRealCode = false;
168 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
170 // Print a label for the basic block.
171 EmitBasicBlockStart(I);
172 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
174 // Print the assembly for the instruction.
176 hasAnyRealCode = true;
177 printMachineInstruction(II);
181 if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
182 // If the function is empty, then we need to emit *something*. Otherwise,
183 // the function's label might be associated with something that it wasn't
184 // meant to be associated with. We emit a noop in this situation.
185 // We are assuming inline asms are code.
189 if (MAI->hasDotTypeDotSizeDirective())
190 O << "\t.size\t" << *CurrentFnSym << ", .-" << *CurrentFnSym << '\n';
192 // Emit post-function debug information.
193 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
194 DW->EndFunction(&MF);
196 // Print out jump tables referenced by the function.
197 EmitJumpTableInfo(MF);
199 // We didn't modify anything.
203 /// printSymbolOperand - Print a raw symbol reference operand. This handles
204 /// jump tables, constant pools, global address and external symbols, all of
205 /// which print to a label with various suffixes for relocation types etc.
206 void X86AsmPrinter::printSymbolOperand(const MachineOperand &MO) {
207 switch (MO.getType()) {
208 default: llvm_unreachable("unknown symbol type!");
209 case MachineOperand::MO_JumpTableIndex:
210 O << *GetJTISymbol(MO.getIndex());
212 case MachineOperand::MO_ConstantPoolIndex:
213 O << *GetCPISymbol(MO.getIndex());
214 printOffset(MO.getOffset());
216 case MachineOperand::MO_GlobalAddress: {
217 const GlobalValue *GV = MO.getGlobal();
220 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
221 GVSym = GetSymbolWithGlobalValueBase(GV, "$stub");
222 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
223 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
224 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
225 GVSym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
227 GVSym = GetGlobalValueSymbol(GV);
229 if (Subtarget->isTargetCygMing()) {
230 X86COFFMachineModuleInfo &COFFMMI =
231 MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
232 COFFMMI.DecorateCygMingName(GVSym, OutContext, GV, *TM.getTargetData());
235 // Handle dllimport linkage.
236 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
237 GVSym = OutContext.GetOrCreateSymbol(Twine("__imp_") + GVSym->getName());
239 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
240 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
241 MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
243 const MCSymbol *&StubSym =
244 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
246 StubSym = GetGlobalValueSymbol(GV);
248 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
249 MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
250 const MCSymbol *&StubSym =
251 MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(Sym);
253 StubSym = GetGlobalValueSymbol(GV);
254 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
255 MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$stub");
256 const MCSymbol *&StubSym =
257 MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
259 StubSym = GetGlobalValueSymbol(GV);
262 // If the name begins with a dollar-sign, enclose it in parens. We do this
263 // to avoid having it look like an integer immediate to the assembler.
264 if (GVSym->getName()[0] != '$')
267 O << '(' << *GVSym << ')';
268 printOffset(MO.getOffset());
271 case MachineOperand::MO_ExternalSymbol: {
272 const MCSymbol *SymToPrint;
273 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
274 SmallString<128> TempNameStr;
275 TempNameStr += StringRef(MO.getSymbolName());
276 TempNameStr += StringRef("$stub");
278 const MCSymbol *Sym = GetExternalSymbolSymbol(TempNameStr.str());
279 const MCSymbol *&StubSym =
280 MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
282 TempNameStr.erase(TempNameStr.end()-5, TempNameStr.end());
283 StubSym = OutContext.GetOrCreateSymbol(TempNameStr.str());
285 SymToPrint = StubSym;
287 SymToPrint = GetExternalSymbolSymbol(MO.getSymbolName());
290 // If the name begins with a dollar-sign, enclose it in parens. We do this
291 // to avoid having it look like an integer immediate to the assembler.
292 if (SymToPrint->getName()[0] != '$')
295 O << '(' << *SymToPrint << '(';
300 switch (MO.getTargetFlags()) {
302 llvm_unreachable("Unknown target flag on GV operand");
303 case X86II::MO_NO_FLAG: // No flag.
305 case X86II::MO_DARWIN_NONLAZY:
306 case X86II::MO_DLLIMPORT:
307 case X86II::MO_DARWIN_STUB:
308 // These affect the name of the symbol, not any suffix.
310 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
312 PrintPICBaseSymbol();
315 case X86II::MO_PIC_BASE_OFFSET:
316 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
317 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
319 PrintPICBaseSymbol();
321 case X86II::MO_TLSGD: O << "@TLSGD"; break;
322 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
323 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
324 case X86II::MO_TPOFF: O << "@TPOFF"; break;
325 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
326 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
327 case X86II::MO_GOT: O << "@GOT"; break;
328 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
329 case X86II::MO_PLT: O << "@PLT"; break;
333 /// print_pcrel_imm - This is used to print an immediate value that ends up
334 /// being encoded as a pc-relative value. These print slightly differently, for
335 /// example, a $ is not emitted.
336 void X86AsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
337 const MachineOperand &MO = MI->getOperand(OpNo);
338 switch (MO.getType()) {
339 default: llvm_unreachable("Unknown pcrel immediate operand");
340 case MachineOperand::MO_Immediate:
343 case MachineOperand::MO_MachineBasicBlock:
344 O << *GetMBBSymbol(MO.getMBB()->getNumber());
346 case MachineOperand::MO_GlobalAddress:
347 case MachineOperand::MO_ExternalSymbol:
348 printSymbolOperand(MO);
354 void X86AsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
355 const char *Modifier) {
356 const MachineOperand &MO = MI->getOperand(OpNo);
357 switch (MO.getType()) {
358 default: llvm_unreachable("unknown operand type!");
359 case MachineOperand::MO_Register: {
361 unsigned Reg = MO.getReg();
362 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
363 EVT VT = (strcmp(Modifier+6,"64") == 0) ?
364 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
365 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
366 Reg = getX86SubSuperRegister(Reg, VT);
368 O << X86ATTInstPrinter::getRegisterName(Reg);
372 case MachineOperand::MO_Immediate:
373 O << '$' << MO.getImm();
376 case MachineOperand::MO_JumpTableIndex:
377 case MachineOperand::MO_ConstantPoolIndex:
378 case MachineOperand::MO_GlobalAddress:
379 case MachineOperand::MO_ExternalSymbol: {
381 printSymbolOperand(MO);
387 void X86AsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
388 unsigned char value = MI->getOperand(Op).getImm();
389 assert(value <= 7 && "Invalid ssecc argument!");
391 case 0: O << "eq"; break;
392 case 1: O << "lt"; break;
393 case 2: O << "le"; break;
394 case 3: O << "unord"; break;
395 case 4: O << "neq"; break;
396 case 5: O << "nlt"; break;
397 case 6: O << "nle"; break;
398 case 7: O << "ord"; break;
402 void X86AsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
403 const char *Modifier) {
404 const MachineOperand &BaseReg = MI->getOperand(Op);
405 const MachineOperand &IndexReg = MI->getOperand(Op+2);
406 const MachineOperand &DispSpec = MI->getOperand(Op+3);
408 // If we really don't want to print out (rip), don't.
409 bool HasBaseReg = BaseReg.getReg() != 0;
410 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
411 BaseReg.getReg() == X86::RIP)
414 // HasParenPart - True if we will print out the () part of the mem ref.
415 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
417 if (DispSpec.isImm()) {
418 int DispVal = DispSpec.getImm();
419 if (DispVal || !HasParenPart)
422 assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
423 DispSpec.isJTI() || DispSpec.isSymbol());
424 printSymbolOperand(MI->getOperand(Op+3));
428 assert(IndexReg.getReg() != X86::ESP &&
429 "X86 doesn't allow scaling by ESP");
433 printOperand(MI, Op, Modifier);
435 if (IndexReg.getReg()) {
437 printOperand(MI, Op+2, Modifier);
438 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
440 O << ',' << ScaleVal;
446 void X86AsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
447 const char *Modifier) {
448 assert(isMem(MI, Op) && "Invalid memory reference!");
449 const MachineOperand &Segment = MI->getOperand(Op+4);
450 if (Segment.getReg()) {
451 printOperand(MI, Op+4, Modifier);
454 printLeaMemReference(MI, Op, Modifier);
457 void X86AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
458 const MachineBasicBlock *MBB) const {
459 if (!MAI->getSetDirective())
462 // We don't need .set machinery if we have GOT-style relocations
463 if (Subtarget->isPICStyleGOT()) // X86-32 on ELF.
466 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
467 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
469 O << *GetMBBSymbol(MBB->getNumber());
471 if (Subtarget->isPICStyleRIPRel())
472 O << '-' << *GetJTISymbol(uid) << '\n';
475 PrintPICBaseSymbol();
481 void X86AsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
482 PrintPICBaseSymbol();
484 PrintPICBaseSymbol();
488 void X86AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
489 const MachineBasicBlock *MBB,
490 unsigned uid) const {
491 const char *JTEntryDirective = MJTI->getEntrySize(*TM.getTargetData()) == 4 ?
492 MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
494 O << JTEntryDirective << ' ';
496 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
497 O << *GetJTSetSymbol(uid, MBB->getNumber());
498 } else if (Subtarget->isPICStyleGOT())
499 O << *GetMBBSymbol(MBB->getNumber()) << "@GOTOFF";
500 else // mdynamic-no-pic
501 O << *GetMBBSymbol(MBB->getNumber());
505 bool X86AsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
506 unsigned Reg = MO.getReg();
508 default: return true; // Unknown mode.
509 case 'b': // Print QImode register
510 Reg = getX86SubSuperRegister(Reg, MVT::i8);
512 case 'h': // Print QImode high register
513 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
515 case 'w': // Print HImode register
516 Reg = getX86SubSuperRegister(Reg, MVT::i16);
518 case 'k': // Print SImode register
519 Reg = getX86SubSuperRegister(Reg, MVT::i32);
521 case 'q': // Print DImode register
522 Reg = getX86SubSuperRegister(Reg, MVT::i64);
526 O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
530 /// PrintAsmOperand - Print out an operand for an inline asm expression.
532 bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
534 const char *ExtraCode) {
535 // Does this asm operand have a single letter operand modifier?
536 if (ExtraCode && ExtraCode[0]) {
537 if (ExtraCode[1] != 0) return true; // Unknown modifier.
539 const MachineOperand &MO = MI->getOperand(OpNo);
541 switch (ExtraCode[0]) {
542 default: return true; // Unknown modifier.
543 case 'a': // This is an address. Currently only 'i' and 'r' are expected.
548 if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
549 printSymbolOperand(MO);
554 printOperand(MI, OpNo);
560 case 'c': // Don't print "$" before a global var name or constant.
563 else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
564 printSymbolOperand(MO);
566 printOperand(MI, OpNo);
569 case 'A': // Print '*' before a register (it must be a register)
572 printOperand(MI, OpNo);
577 case 'b': // Print QImode register
578 case 'h': // Print QImode high register
579 case 'w': // Print HImode register
580 case 'k': // Print SImode register
581 case 'q': // Print DImode register
583 return printAsmMRegister(MO, ExtraCode[0]);
584 printOperand(MI, OpNo);
587 case 'P': // This is the operand of a call, treat specially.
588 print_pcrel_imm(MI, OpNo);
591 case 'n': // Negate the immediate or print a '-' before the operand.
592 // Note: this is a temporary solution. It should be handled target
593 // independently as part of the 'MC' work.
602 printOperand(MI, OpNo);
606 bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
607 unsigned OpNo, unsigned AsmVariant,
608 const char *ExtraCode) {
609 if (ExtraCode && ExtraCode[0]) {
610 if (ExtraCode[1] != 0) return true; // Unknown modifier.
612 switch (ExtraCode[0]) {
613 default: return true; // Unknown modifier.
614 case 'b': // Print QImode register
615 case 'h': // Print QImode high register
616 case 'w': // Print HImode register
617 case 'k': // Print SImode register
618 case 'q': // Print SImode register
619 // These only apply to registers, ignore on mem.
621 case 'P': // Don't print @PLT, but do print as memory.
622 printMemReference(MI, OpNo, "no-rip");
626 printMemReference(MI, OpNo);
632 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
633 /// AT&T syntax to the current output stream.
635 void X86AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
638 processDebugLoc(MI, true);
640 printInstructionThroughMCStreamer(MI);
646 processDebugLoc(MI, false);
649 void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
650 if (Subtarget->isTargetDarwin()) {
651 // All darwin targets use mach-o.
652 TargetLoweringObjectFileMachO &TLOFMacho =
653 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
655 MachineModuleInfoMachO &MMIMacho =
656 MMI->getObjFileInfo<MachineModuleInfoMachO>();
658 // Output stubs for dynamically-linked functions.
659 MachineModuleInfoMachO::SymbolListTy Stubs;
661 Stubs = MMIMacho.GetFnStubList();
662 if (!Stubs.empty()) {
663 const MCSection *TheSection =
664 TLOFMacho.getMachOSection("__IMPORT", "__jump_table",
665 MCSectionMachO::S_SYMBOL_STUBS |
666 MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
667 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
668 5, SectionKind::getMetadata());
669 OutStreamer.SwitchSection(TheSection);
671 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
672 O << *Stubs[i].first << ":\n";
673 // Get the MCSymbol without the $stub suffix.
674 O << "\t.indirect_symbol " << *Stubs[i].second;
675 O << "\n\thlt ; hlt ; hlt ; hlt ; hlt\n";
682 // Output stubs for external and common global variables.
683 Stubs = MMIMacho.GetGVStubList();
684 if (!Stubs.empty()) {
685 const MCSection *TheSection =
686 TLOFMacho.getMachOSection("__IMPORT", "__pointers",
687 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
688 SectionKind::getMetadata());
689 OutStreamer.SwitchSection(TheSection);
691 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
692 O << *Stubs[i].first << ":\n\t.indirect_symbol " << *Stubs[i].second;
693 O << "\n\t.long\t0\n";
698 Stubs = MMIMacho.GetHiddenGVStubList();
699 if (!Stubs.empty()) {
700 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
703 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
704 O << *Stubs[i].first << ":\n" << MAI->getData32bitsDirective();
705 O << *Stubs[i].second << '\n';
710 // Funny Darwin hack: This flag tells the linker that no global symbols
711 // contain code that falls through to other global symbols (e.g. the obvious
712 // implementation of multiple entry points). If this doesn't occur, the
713 // linker can safely perform dead code stripping. Since LLVM never
714 // generates code that does this, it is always safe to set.
715 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
718 if (Subtarget->isTargetCOFF()) {
719 X86COFFMachineModuleInfo &COFFMMI =
720 MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
722 // Emit type information for external functions
723 for (X86COFFMachineModuleInfo::stub_iterator I = COFFMMI.stub_begin(),
724 E = COFFMMI.stub_end(); I != E; ++I) {
725 O << "\t.def\t " << I->getKeyData()
726 << ";\t.scl\t" << COFF::C_EXT
727 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
731 if (Subtarget->isTargetCygMing()) {
732 // Necessary for dllexport support
733 std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals;
735 TargetLoweringObjectFileCOFF &TLOFCOFF =
736 static_cast<TargetLoweringObjectFileCOFF&>(getObjFileLowering());
738 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
739 if (I->hasDLLExportLinkage()) {
740 MCSymbol *Sym = GetGlobalValueSymbol(I);
741 COFFMMI.DecorateCygMingName(Sym, OutContext, I, *TM.getTargetData());
742 DLLExportedFns.push_back(Sym);
745 for (Module::const_global_iterator I = M.global_begin(),
746 E = M.global_end(); I != E; ++I)
747 if (I->hasDLLExportLinkage())
748 DLLExportedGlobals.push_back(GetGlobalValueSymbol(I));
750 // Output linker support code for dllexported globals on windows.
751 if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
752 OutStreamer.SwitchSection(TLOFCOFF.getCOFFSection(".section .drectve",
754 SectionKind::getMetadata()));
755 for (unsigned i = 0, e = DLLExportedGlobals.size(); i != e; ++i)
756 O << "\t.ascii \" -export:" << *DLLExportedGlobals[i] << ",data\"\n";
758 for (unsigned i = 0, e = DLLExportedFns.size(); i != e; ++i)
759 O << "\t.ascii \" -export:" << *DLLExportedFns[i] << "\"\n";
766 //===----------------------------------------------------------------------===//
767 // Target Registry Stuff
768 //===----------------------------------------------------------------------===//
770 static MCInstPrinter *createX86MCInstPrinter(const Target &T,
771 unsigned SyntaxVariant,
772 const MCAsmInfo &MAI,
774 if (SyntaxVariant == 0)
775 return new X86ATTInstPrinter(O, MAI);
776 if (SyntaxVariant == 1)
777 return new X86IntelInstPrinter(O, MAI);
781 // Force static initialization.
782 extern "C" void LLVMInitializeX86AsmPrinter() {
783 RegisterAsmPrinter<X86AsmPrinter> X(TheX86_32Target);
784 RegisterAsmPrinter<X86AsmPrinter> Y(TheX86_64Target);
786 TargetRegistry::RegisterMCInstPrinter(TheX86_32Target,createX86MCInstPrinter);
787 TargetRegistry::RegisterMCInstPrinter(TheX86_64Target,createX86MCInstPrinter);