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 X86 machine code.
13 //===----------------------------------------------------------------------===//
15 #include "X86AsmPrinter.h"
16 #include "InstPrinter/X86ATTInstPrinter.h"
17 #include "MCTargetDesc/X86BaseInfo.h"
18 #include "X86COFFMachineModuleInfo.h"
19 #include "X86InstrInfo.h"
20 #include "X86MachineFunctionInfo.h"
21 #include "llvm/ADT/SmallString.h"
22 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
23 #include "llvm/CodeGen/MachineValueType.h"
24 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
25 #include "llvm/IR/DebugInfo.h"
26 #include "llvm/IR/DerivedTypes.h"
27 #include "llvm/IR/Mangler.h"
28 #include "llvm/IR/Module.h"
29 #include "llvm/IR/Type.h"
30 #include "llvm/MC/MCAsmInfo.h"
31 #include "llvm/MC/MCContext.h"
32 #include "llvm/MC/MCExpr.h"
33 #include "llvm/MC/MCSectionMachO.h"
34 #include "llvm/MC/MCStreamer.h"
35 #include "llvm/MC/MCSymbol.h"
36 #include "llvm/Support/COFF.h"
37 #include "llvm/Support/Debug.h"
38 #include "llvm/Support/ErrorHandling.h"
39 #include "llvm/Support/TargetRegistry.h"
42 //===----------------------------------------------------------------------===//
43 // Primitive Helper Functions.
44 //===----------------------------------------------------------------------===//
46 /// runOnMachineFunction - Emit the function body.
48 bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
49 SetupMachineFunction(MF);
51 if (Subtarget->isTargetCOFF()) {
52 bool Intrn = MF.getFunction()->hasInternalLinkage();
53 OutStreamer.BeginCOFFSymbolDef(CurrentFnSym);
54 OutStreamer.EmitCOFFSymbolStorageClass(Intrn ? COFF::IMAGE_SYM_CLASS_STATIC
55 : COFF::IMAGE_SYM_CLASS_EXTERNAL);
56 OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
57 << COFF::SCT_COMPLEX_TYPE_SHIFT);
58 OutStreamer.EndCOFFSymbolDef();
61 // Have common code print out the function header with linkage info etc.
64 // Emit the rest of the function body.
67 // We didn't modify anything.
71 /// printSymbolOperand - Print a raw symbol reference operand. This handles
72 /// jump tables, constant pools, global address and external symbols, all of
73 /// which print to a label with various suffixes for relocation types etc.
74 static void printSymbolOperand(X86AsmPrinter &P, const MachineOperand &MO,
76 switch (MO.getType()) {
77 default: llvm_unreachable("unknown symbol type!");
78 case MachineOperand::MO_ConstantPoolIndex:
79 O << *P.GetCPISymbol(MO.getIndex());
80 P.printOffset(MO.getOffset(), O);
82 case MachineOperand::MO_GlobalAddress: {
83 const GlobalValue *GV = MO.getGlobal();
86 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
87 GVSym = P.getSymbolWithGlobalValueBase(GV, "$stub");
88 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
89 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
90 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
91 GVSym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
93 GVSym = P.getSymbol(GV);
95 // Handle dllimport linkage.
96 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
98 P.OutContext.GetOrCreateSymbol(Twine("__imp_") + GVSym->getName());
100 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
101 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
102 MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
103 MachineModuleInfoImpl::StubValueTy &StubSym =
104 P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
105 if (StubSym.getPointer() == 0)
106 StubSym = MachineModuleInfoImpl::
107 StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage());
108 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
109 MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
110 MachineModuleInfoImpl::StubValueTy &StubSym =
111 P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(
113 if (StubSym.getPointer() == 0)
114 StubSym = MachineModuleInfoImpl::
115 StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage());
116 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
117 MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$stub");
118 MachineModuleInfoImpl::StubValueTy &StubSym =
119 P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
120 if (StubSym.getPointer() == 0)
121 StubSym = MachineModuleInfoImpl::
122 StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage());
125 // If the name begins with a dollar-sign, enclose it in parens. We do this
126 // to avoid having it look like an integer immediate to the assembler.
127 if (GVSym->getName()[0] != '$')
130 O << '(' << *GVSym << ')';
131 P.printOffset(MO.getOffset(), O);
136 switch (MO.getTargetFlags()) {
138 llvm_unreachable("Unknown target flag on GV operand");
139 case X86II::MO_NO_FLAG: // No flag.
141 case X86II::MO_DARWIN_NONLAZY:
142 case X86II::MO_DLLIMPORT:
143 case X86II::MO_DARWIN_STUB:
144 // These affect the name of the symbol, not any suffix.
146 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
147 O << " + [.-" << *P.MF->getPICBaseSymbol() << ']';
149 case X86II::MO_PIC_BASE_OFFSET:
150 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
151 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
152 O << '-' << *P.MF->getPICBaseSymbol();
154 case X86II::MO_TLSGD: O << "@TLSGD"; break;
155 case X86II::MO_TLSLD: O << "@TLSLD"; break;
156 case X86II::MO_TLSLDM: O << "@TLSLDM"; break;
157 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
158 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
159 case X86II::MO_TPOFF: O << "@TPOFF"; break;
160 case X86II::MO_DTPOFF: O << "@DTPOFF"; break;
161 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
162 case X86II::MO_GOTNTPOFF: O << "@GOTNTPOFF"; break;
163 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
164 case X86II::MO_GOT: O << "@GOT"; break;
165 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
166 case X86II::MO_PLT: O << "@PLT"; break;
167 case X86II::MO_TLVP: O << "@TLVP"; break;
168 case X86II::MO_TLVP_PIC_BASE:
169 O << "@TLVP" << '-' << *P.MF->getPICBaseSymbol();
171 case X86II::MO_SECREL: O << "@SECREL32"; break;
175 static void printOperand(X86AsmPrinter &P, const MachineInstr *MI,
176 unsigned OpNo, raw_ostream &O,
177 const char *Modifier = 0, unsigned AsmVariant = 0);
179 /// printPCRelImm - This is used to print an immediate value that ends up
180 /// being encoded as a pc-relative value. These print slightly differently, for
181 /// example, a $ is not emitted.
182 static void printPCRelImm(X86AsmPrinter &P, const MachineInstr *MI,
183 unsigned OpNo, raw_ostream &O) {
184 const MachineOperand &MO = MI->getOperand(OpNo);
185 switch (MO.getType()) {
186 default: llvm_unreachable("Unknown pcrel immediate operand");
187 case MachineOperand::MO_Register:
188 // pc-relativeness was handled when computing the value in the reg.
189 printOperand(P, MI, OpNo, O);
191 case MachineOperand::MO_Immediate:
194 case MachineOperand::MO_GlobalAddress:
195 printSymbolOperand(P, MO, O);
200 static void printOperand(X86AsmPrinter &P, const MachineInstr *MI,
201 unsigned OpNo, raw_ostream &O, const char *Modifier,
202 unsigned AsmVariant) {
203 const MachineOperand &MO = MI->getOperand(OpNo);
204 switch (MO.getType()) {
205 default: llvm_unreachable("unknown operand type!");
206 case MachineOperand::MO_Register: {
207 // FIXME: Enumerating AsmVariant, so we can remove magic number.
208 if (AsmVariant == 0) O << '%';
209 unsigned Reg = MO.getReg();
210 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
211 MVT::SimpleValueType VT = (strcmp(Modifier+6,"64") == 0) ?
212 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
213 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
214 Reg = getX86SubSuperRegister(Reg, VT);
216 O << X86ATTInstPrinter::getRegisterName(Reg);
220 case MachineOperand::MO_Immediate:
221 if (AsmVariant == 0) O << '$';
225 case MachineOperand::MO_GlobalAddress: {
226 if (AsmVariant == 0) O << '$';
227 printSymbolOperand(P, MO, O);
233 static void printLeaMemReference(X86AsmPrinter &P, const MachineInstr *MI,
234 unsigned Op, raw_ostream &O,
235 const char *Modifier = NULL) {
236 const MachineOperand &BaseReg = MI->getOperand(Op+X86::AddrBaseReg);
237 const MachineOperand &IndexReg = MI->getOperand(Op+X86::AddrIndexReg);
238 const MachineOperand &DispSpec = MI->getOperand(Op+X86::AddrDisp);
240 // If we really don't want to print out (rip), don't.
241 bool HasBaseReg = BaseReg.getReg() != 0;
242 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
243 BaseReg.getReg() == X86::RIP)
246 // HasParenPart - True if we will print out the () part of the mem ref.
247 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
249 switch (DispSpec.getType()) {
251 llvm_unreachable("unknown operand type!");
252 case MachineOperand::MO_Immediate: {
253 int DispVal = DispSpec.getImm();
254 if (DispVal || !HasParenPart)
258 case MachineOperand::MO_GlobalAddress:
259 case MachineOperand::MO_ConstantPoolIndex:
260 printSymbolOperand(P, DispSpec, O);
263 if (Modifier && strcmp(Modifier, "H") == 0)
267 assert(IndexReg.getReg() != X86::ESP &&
268 "X86 doesn't allow scaling by ESP");
272 printOperand(P, MI, Op+X86::AddrBaseReg, O, Modifier);
274 if (IndexReg.getReg()) {
276 printOperand(P, MI, Op+X86::AddrIndexReg, O, Modifier);
277 unsigned ScaleVal = MI->getOperand(Op+X86::AddrScaleAmt).getImm();
279 O << ',' << ScaleVal;
285 static void printMemReference(X86AsmPrinter &P, const MachineInstr *MI,
286 unsigned Op, raw_ostream &O,
287 const char *Modifier = NULL) {
288 assert(isMem(MI, Op) && "Invalid memory reference!");
289 const MachineOperand &Segment = MI->getOperand(Op+X86::AddrSegmentReg);
290 if (Segment.getReg()) {
291 printOperand(P, MI, Op+X86::AddrSegmentReg, O, Modifier);
294 printLeaMemReference(P, MI, Op, O, Modifier);
297 static void printIntelMemReference(X86AsmPrinter &P, const MachineInstr *MI,
298 unsigned Op, raw_ostream &O,
299 const char *Modifier = NULL,
300 unsigned AsmVariant = 1) {
301 const MachineOperand &BaseReg = MI->getOperand(Op+X86::AddrBaseReg);
302 unsigned ScaleVal = MI->getOperand(Op+X86::AddrScaleAmt).getImm();
303 const MachineOperand &IndexReg = MI->getOperand(Op+X86::AddrIndexReg);
304 const MachineOperand &DispSpec = MI->getOperand(Op+X86::AddrDisp);
305 const MachineOperand &SegReg = MI->getOperand(Op+X86::AddrSegmentReg);
307 // If this has a segment register, print it.
308 if (SegReg.getReg()) {
309 printOperand(P, MI, Op+X86::AddrSegmentReg, O, Modifier, AsmVariant);
315 bool NeedPlus = false;
316 if (BaseReg.getReg()) {
317 printOperand(P, MI, Op+X86::AddrBaseReg, O, Modifier, AsmVariant);
321 if (IndexReg.getReg()) {
322 if (NeedPlus) O << " + ";
324 O << ScaleVal << '*';
325 printOperand(P, MI, Op+X86::AddrIndexReg, O, Modifier, AsmVariant);
329 if (!DispSpec.isImm()) {
330 if (NeedPlus) O << " + ";
331 printOperand(P, MI, Op+X86::AddrDisp, O, Modifier, AsmVariant);
333 int64_t DispVal = DispSpec.getImm();
334 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg())) {
349 static bool printAsmMRegister(X86AsmPrinter &P, const MachineOperand &MO,
350 char Mode, raw_ostream &O) {
351 unsigned Reg = MO.getReg();
353 default: return true; // Unknown mode.
354 case 'b': // Print QImode register
355 Reg = getX86SubSuperRegister(Reg, MVT::i8);
357 case 'h': // Print QImode high register
358 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
360 case 'w': // Print HImode register
361 Reg = getX86SubSuperRegister(Reg, MVT::i16);
363 case 'k': // Print SImode register
364 Reg = getX86SubSuperRegister(Reg, MVT::i32);
366 case 'q': // Print DImode register
367 // FIXME: gcc will actually print e instead of r for 32-bit.
368 Reg = getX86SubSuperRegister(Reg, MVT::i64);
372 O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
376 /// PrintAsmOperand - Print out an operand for an inline asm expression.
378 bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
380 const char *ExtraCode, raw_ostream &O) {
381 // Does this asm operand have a single letter operand modifier?
382 if (ExtraCode && ExtraCode[0]) {
383 if (ExtraCode[1] != 0) return true; // Unknown modifier.
385 const MachineOperand &MO = MI->getOperand(OpNo);
387 switch (ExtraCode[0]) {
389 // See if this is a generic print operand
390 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
391 case 'a': // This is an address. Currently only 'i' and 'r' are expected.
392 switch (MO.getType()) {
395 case MachineOperand::MO_Immediate:
398 case MachineOperand::MO_ConstantPoolIndex:
399 case MachineOperand::MO_JumpTableIndex:
400 case MachineOperand::MO_ExternalSymbol:
401 llvm_unreachable("unexpected operand type!");
402 case MachineOperand::MO_GlobalAddress:
403 printSymbolOperand(*this, MO, O);
404 if (Subtarget->isPICStyleRIPRel())
407 case MachineOperand::MO_Register:
409 printOperand(*this, MI, OpNo, O);
414 case 'c': // Don't print "$" before a global var name or constant.
415 switch (MO.getType()) {
417 printOperand(*this, MI, OpNo, O);
419 case MachineOperand::MO_Immediate:
422 case MachineOperand::MO_ConstantPoolIndex:
423 case MachineOperand::MO_JumpTableIndex:
424 case MachineOperand::MO_ExternalSymbol:
425 llvm_unreachable("unexpected operand type!");
426 case MachineOperand::MO_GlobalAddress:
427 printSymbolOperand(*this, MO, O);
432 case 'A': // Print '*' before a register (it must be a register)
435 printOperand(*this, MI, OpNo, O);
440 case 'b': // Print QImode register
441 case 'h': // Print QImode high register
442 case 'w': // Print HImode register
443 case 'k': // Print SImode register
444 case 'q': // Print DImode register
446 return printAsmMRegister(*this, MO, ExtraCode[0], O);
447 printOperand(*this, MI, OpNo, O);
450 case 'P': // This is the operand of a call, treat specially.
451 printPCRelImm(*this, MI, OpNo, O);
454 case 'n': // Negate the immediate or print a '-' before the operand.
455 // Note: this is a temporary solution. It should be handled target
456 // independently as part of the 'MC' work.
465 printOperand(*this, MI, OpNo, O, /*Modifier*/ 0, AsmVariant);
469 bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
470 unsigned OpNo, unsigned AsmVariant,
471 const char *ExtraCode,
474 printIntelMemReference(*this, MI, OpNo, O);
478 if (ExtraCode && ExtraCode[0]) {
479 if (ExtraCode[1] != 0) return true; // Unknown modifier.
481 switch (ExtraCode[0]) {
482 default: return true; // Unknown modifier.
483 case 'b': // Print QImode register
484 case 'h': // Print QImode high register
485 case 'w': // Print HImode register
486 case 'k': // Print SImode register
487 case 'q': // Print SImode register
488 // These only apply to registers, ignore on mem.
491 printMemReference(*this, MI, OpNo, O, "H");
493 case 'P': // Don't print @PLT, but do print as memory.
494 printMemReference(*this, MI, OpNo, O, "no-rip");
498 printMemReference(*this, MI, OpNo, O);
502 void X86AsmPrinter::EmitStartOfAsmFile(Module &M) {
503 if (Subtarget->isTargetMacho())
504 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
506 if (Subtarget->isTargetCOFF()) {
507 // Emit an absolute @feat.00 symbol. This appears to be some kind of
508 // compiler features bitfield read by link.exe.
509 if (!Subtarget->is64Bit()) {
510 MCSymbol *S = MMI->getContext().GetOrCreateSymbol(StringRef("@feat.00"));
511 OutStreamer.BeginCOFFSymbolDef(S);
512 OutStreamer.EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_STATIC);
513 OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_NULL);
514 OutStreamer.EndCOFFSymbolDef();
515 // According to the PE-COFF spec, the LSB of this value marks the object
516 // for "registered SEH". This means that all SEH handler entry points
517 // must be registered in .sxdata. Use of any unregistered handlers will
518 // cause the process to terminate immediately. LLVM does not know how to
519 // register any SEH handlers, so its object files should be safe.
521 OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
522 OutStreamer.EmitAssignment(
523 S, MCConstantExpr::Create(int64_t(1), MMI->getContext()));
529 void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
530 if (Subtarget->isTargetMacho()) {
531 // All darwin targets use mach-o.
532 MachineModuleInfoMachO &MMIMacho =
533 MMI->getObjFileInfo<MachineModuleInfoMachO>();
535 // Output stubs for dynamically-linked functions.
536 MachineModuleInfoMachO::SymbolListTy Stubs;
538 Stubs = MMIMacho.GetFnStubList();
539 if (!Stubs.empty()) {
540 const MCSection *TheSection =
541 OutContext.getMachOSection("__IMPORT", "__jump_table",
542 MachO::S_SYMBOL_STUBS |
543 MachO::S_ATTR_SELF_MODIFYING_CODE |
544 MachO::S_ATTR_PURE_INSTRUCTIONS,
545 5, SectionKind::getMetadata());
546 OutStreamer.SwitchSection(TheSection);
548 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
550 OutStreamer.EmitLabel(Stubs[i].first);
551 // .indirect_symbol _foo
552 OutStreamer.EmitSymbolAttribute(Stubs[i].second.getPointer(),
553 MCSA_IndirectSymbol);
554 // hlt; hlt; hlt; hlt; hlt hlt = 0xf4.
555 const char HltInsts[] = "\xf4\xf4\xf4\xf4\xf4";
556 OutStreamer.EmitBytes(StringRef(HltInsts, 5));
560 OutStreamer.AddBlankLine();
563 // Output stubs for external and common global variables.
564 Stubs = MMIMacho.GetGVStubList();
565 if (!Stubs.empty()) {
566 const MCSection *TheSection =
567 OutContext.getMachOSection("__IMPORT", "__pointers",
568 MachO::S_NON_LAZY_SYMBOL_POINTERS,
569 SectionKind::getMetadata());
570 OutStreamer.SwitchSection(TheSection);
572 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
573 // L_foo$non_lazy_ptr:
574 OutStreamer.EmitLabel(Stubs[i].first);
575 // .indirect_symbol _foo
576 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
577 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(),
578 MCSA_IndirectSymbol);
581 // External to current translation unit.
582 OutStreamer.EmitIntValue(0, 4/*size*/);
584 // Internal to current translation unit.
586 // When we place the LSDA into the TEXT section, the type info
587 // pointers need to be indirect and pc-rel. We accomplish this by
588 // using NLPs. However, sometimes the types are local to the file. So
589 // we need to fill in the value for the NLP in those cases.
590 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
591 OutContext), 4/*size*/);
594 OutStreamer.AddBlankLine();
597 Stubs = MMIMacho.GetHiddenGVStubList();
598 if (!Stubs.empty()) {
599 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
602 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
603 // L_foo$non_lazy_ptr:
604 OutStreamer.EmitLabel(Stubs[i].first);
606 OutStreamer.EmitValue(MCSymbolRefExpr::
607 Create(Stubs[i].second.getPointer(),
608 OutContext), 4/*size*/);
611 OutStreamer.AddBlankLine();
614 SM.serializeToStackMapSection();
616 // Funny Darwin hack: This flag tells the linker that no global symbols
617 // contain code that falls through to other global symbols (e.g. the obvious
618 // implementation of multiple entry points). If this doesn't occur, the
619 // linker can safely perform dead code stripping. Since LLVM never
620 // generates code that does this, it is always safe to set.
621 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
624 if (Subtarget->isTargetWindows() && !Subtarget->isTargetCygMing() &&
625 MMI->usesVAFloatArgument()) {
626 StringRef SymbolName = Subtarget->is64Bit() ? "_fltused" : "__fltused";
627 MCSymbol *S = MMI->getContext().GetOrCreateSymbol(SymbolName);
628 OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
631 if (Subtarget->isTargetCOFF()) {
632 X86COFFMachineModuleInfo &COFFMMI =
633 MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
635 // Emit type information for external functions
636 typedef X86COFFMachineModuleInfo::externals_iterator externals_iterator;
637 for (externals_iterator I = COFFMMI.externals_begin(),
638 E = COFFMMI.externals_end();
640 OutStreamer.BeginCOFFSymbolDef(CurrentFnSym);
641 OutStreamer.EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_EXTERNAL);
642 OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
643 << COFF::SCT_COMPLEX_TYPE_SHIFT);
644 OutStreamer.EndCOFFSymbolDef();
647 // Necessary for dllexport support
648 std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals;
650 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
651 if (I->hasDLLExportStorageClass())
652 DLLExportedFns.push_back(getSymbol(I));
654 for (Module::const_global_iterator I = M.global_begin(),
655 E = M.global_end(); I != E; ++I)
656 if (I->hasDLLExportStorageClass())
657 DLLExportedGlobals.push_back(getSymbol(I));
659 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
661 const GlobalValue *GV = I;
662 if (!GV->hasDLLExportStorageClass())
665 while (const GlobalAlias *A = dyn_cast<GlobalAlias>(GV))
666 GV = A->getAliasedGlobal();
668 if (isa<Function>(GV))
669 DLLExportedFns.push_back(getSymbol(I));
670 else if (isa<GlobalVariable>(GV))
671 DLLExportedGlobals.push_back(getSymbol(I));
674 // Output linker support code for dllexported globals on windows.
675 if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
676 const TargetLoweringObjectFileCOFF &TLOFCOFF =
677 static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering());
679 OutStreamer.SwitchSection(TLOFCOFF.getDrectveSection());
680 SmallString<128> name;
681 for (unsigned i = 0, e = DLLExportedGlobals.size(); i != e; ++i) {
682 if (Subtarget->isTargetWindows())
686 name += DLLExportedGlobals[i]->getName();
687 if (Subtarget->isTargetWindows())
691 OutStreamer.EmitBytes(name);
694 for (unsigned i = 0, e = DLLExportedFns.size(); i != e; ++i) {
695 if (Subtarget->isTargetWindows())
699 name += DLLExportedFns[i]->getName();
700 OutStreamer.EmitBytes(name);
705 if (Subtarget->isTargetELF()) {
706 const TargetLoweringObjectFileELF &TLOFELF =
707 static_cast<const TargetLoweringObjectFileELF &>(getObjFileLowering());
709 MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
711 // Output stubs for external and common global variables.
712 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
713 if (!Stubs.empty()) {
714 OutStreamer.SwitchSection(TLOFELF.getDataRelSection());
715 const DataLayout *TD = TM.getDataLayout();
717 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
718 OutStreamer.EmitLabel(Stubs[i].first);
719 OutStreamer.EmitSymbolValue(Stubs[i].second.getPointer(),
720 TD->getPointerSize());
727 //===----------------------------------------------------------------------===//
728 // Target Registry Stuff
729 //===----------------------------------------------------------------------===//
731 // Force static initialization.
732 extern "C" void LLVMInitializeX86AsmPrinter() {
733 RegisterAsmPrinter<X86AsmPrinter> X(TheX86_32Target);
734 RegisterAsmPrinter<X86AsmPrinter> Y(TheX86_64Target);