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 "X86InstrInfo.h"
19 #include "X86MachineFunctionInfo.h"
20 #include "llvm/ADT/SmallString.h"
21 #include "llvm/CodeGen/MachineConstantPool.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/MCSectionCOFF.h"
34 #include "llvm/MC/MCSectionMachO.h"
35 #include "llvm/MC/MCStreamer.h"
36 #include "llvm/MC/MCSymbol.h"
37 #include "llvm/Support/COFF.h"
38 #include "llvm/Support/Debug.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/TargetRegistry.h"
43 //===----------------------------------------------------------------------===//
44 // Primitive Helper Functions.
45 //===----------------------------------------------------------------------===//
47 /// runOnMachineFunction - Emit the function body.
49 bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
50 Subtarget = &MF.getSubtarget<X86Subtarget>();
52 SMShadowTracker.startFunction(MF);
54 SetupMachineFunction(MF);
56 if (Subtarget->isTargetCOFF()) {
57 bool Intrn = MF.getFunction()->hasInternalLinkage();
58 OutStreamer->BeginCOFFSymbolDef(CurrentFnSym);
59 OutStreamer->EmitCOFFSymbolStorageClass(Intrn ? COFF::IMAGE_SYM_CLASS_STATIC
60 : COFF::IMAGE_SYM_CLASS_EXTERNAL);
61 OutStreamer->EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
62 << COFF::SCT_COMPLEX_TYPE_SHIFT);
63 OutStreamer->EndCOFFSymbolDef();
66 // Emit the rest of the function body.
69 // We didn't modify anything.
73 /// printSymbolOperand - Print a raw symbol reference operand. This handles
74 /// jump tables, constant pools, global address and external symbols, all of
75 /// which print to a label with various suffixes for relocation types etc.
76 static void printSymbolOperand(X86AsmPrinter &P, const MachineOperand &MO,
78 switch (MO.getType()) {
79 default: llvm_unreachable("unknown symbol type!");
80 case MachineOperand::MO_ConstantPoolIndex:
81 O << *P.GetCPISymbol(MO.getIndex());
82 P.printOffset(MO.getOffset(), O);
84 case MachineOperand::MO_GlobalAddress: {
85 const GlobalValue *GV = MO.getGlobal();
88 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
89 GVSym = P.getSymbolWithGlobalValueBase(GV, "$stub");
90 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
91 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
92 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
93 GVSym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
95 GVSym = P.getSymbol(GV);
97 // Handle dllimport linkage.
98 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
100 P.OutContext.GetOrCreateSymbol(Twine("__imp_") + GVSym->getName());
102 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
103 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
104 MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
105 MachineModuleInfoImpl::StubValueTy &StubSym =
106 P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
107 if (!StubSym.getPointer())
108 StubSym = MachineModuleInfoImpl::
109 StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage());
110 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
111 MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
112 MachineModuleInfoImpl::StubValueTy &StubSym =
113 P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(
115 if (!StubSym.getPointer())
116 StubSym = MachineModuleInfoImpl::
117 StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage());
118 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
119 MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$stub");
120 MachineModuleInfoImpl::StubValueTy &StubSym =
121 P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
122 if (!StubSym.getPointer())
123 StubSym = MachineModuleInfoImpl::
124 StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage());
127 // If the name begins with a dollar-sign, enclose it in parens. We do this
128 // to avoid having it look like an integer immediate to the assembler.
129 if (GVSym->getName()[0] != '$')
132 O << '(' << *GVSym << ')';
133 P.printOffset(MO.getOffset(), O);
138 switch (MO.getTargetFlags()) {
140 llvm_unreachable("Unknown target flag on GV operand");
141 case X86II::MO_NO_FLAG: // No flag.
143 case X86II::MO_DARWIN_NONLAZY:
144 case X86II::MO_DLLIMPORT:
145 case X86II::MO_DARWIN_STUB:
146 // These affect the name of the symbol, not any suffix.
148 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
149 O << " + [.-" << *P.MF->getPICBaseSymbol() << ']';
151 case X86II::MO_PIC_BASE_OFFSET:
152 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
153 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
154 O << '-' << *P.MF->getPICBaseSymbol();
156 case X86II::MO_TLSGD: O << "@TLSGD"; break;
157 case X86II::MO_TLSLD: O << "@TLSLD"; break;
158 case X86II::MO_TLSLDM: O << "@TLSLDM"; break;
159 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
160 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
161 case X86II::MO_TPOFF: O << "@TPOFF"; break;
162 case X86II::MO_DTPOFF: O << "@DTPOFF"; break;
163 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
164 case X86II::MO_GOTNTPOFF: O << "@GOTNTPOFF"; break;
165 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
166 case X86II::MO_GOT: O << "@GOT"; break;
167 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
168 case X86II::MO_PLT: O << "@PLT"; break;
169 case X86II::MO_TLVP: O << "@TLVP"; break;
170 case X86II::MO_TLVP_PIC_BASE:
171 O << "@TLVP" << '-' << *P.MF->getPICBaseSymbol();
173 case X86II::MO_SECREL: O << "@SECREL32"; break;
177 static void printOperand(X86AsmPrinter &P, const MachineInstr *MI,
178 unsigned OpNo, raw_ostream &O,
179 const char *Modifier = nullptr, unsigned AsmVariant = 0);
181 /// printPCRelImm - This is used to print an immediate value that ends up
182 /// being encoded as a pc-relative value. These print slightly differently, for
183 /// example, a $ is not emitted.
184 static void printPCRelImm(X86AsmPrinter &P, const MachineInstr *MI,
185 unsigned OpNo, raw_ostream &O) {
186 const MachineOperand &MO = MI->getOperand(OpNo);
187 switch (MO.getType()) {
188 default: llvm_unreachable("Unknown pcrel immediate operand");
189 case MachineOperand::MO_Register:
190 // pc-relativeness was handled when computing the value in the reg.
191 printOperand(P, MI, OpNo, O);
193 case MachineOperand::MO_Immediate:
196 case MachineOperand::MO_GlobalAddress:
197 printSymbolOperand(P, MO, O);
202 static void printOperand(X86AsmPrinter &P, const MachineInstr *MI,
203 unsigned OpNo, raw_ostream &O, const char *Modifier,
204 unsigned AsmVariant) {
205 const MachineOperand &MO = MI->getOperand(OpNo);
206 switch (MO.getType()) {
207 default: llvm_unreachable("unknown operand type!");
208 case MachineOperand::MO_Register: {
209 // FIXME: Enumerating AsmVariant, so we can remove magic number.
210 if (AsmVariant == 0) O << '%';
211 unsigned Reg = MO.getReg();
212 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
213 MVT::SimpleValueType VT = (strcmp(Modifier+6,"64") == 0) ?
214 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
215 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
216 Reg = getX86SubSuperRegister(Reg, VT);
218 O << X86ATTInstPrinter::getRegisterName(Reg);
222 case MachineOperand::MO_Immediate:
223 if (AsmVariant == 0) O << '$';
227 case MachineOperand::MO_GlobalAddress: {
228 if (AsmVariant == 0) O << '$';
229 printSymbolOperand(P, MO, O);
235 static void printLeaMemReference(X86AsmPrinter &P, const MachineInstr *MI,
236 unsigned Op, raw_ostream &O,
237 const char *Modifier = nullptr) {
238 const MachineOperand &BaseReg = MI->getOperand(Op+X86::AddrBaseReg);
239 const MachineOperand &IndexReg = MI->getOperand(Op+X86::AddrIndexReg);
240 const MachineOperand &DispSpec = MI->getOperand(Op+X86::AddrDisp);
242 // If we really don't want to print out (rip), don't.
243 bool HasBaseReg = BaseReg.getReg() != 0;
244 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
245 BaseReg.getReg() == X86::RIP)
248 // HasParenPart - True if we will print out the () part of the mem ref.
249 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
251 switch (DispSpec.getType()) {
253 llvm_unreachable("unknown operand type!");
254 case MachineOperand::MO_Immediate: {
255 int DispVal = DispSpec.getImm();
256 if (DispVal || !HasParenPart)
260 case MachineOperand::MO_GlobalAddress:
261 case MachineOperand::MO_ConstantPoolIndex:
262 printSymbolOperand(P, DispSpec, O);
265 if (Modifier && strcmp(Modifier, "H") == 0)
269 assert(IndexReg.getReg() != X86::ESP &&
270 "X86 doesn't allow scaling by ESP");
274 printOperand(P, MI, Op+X86::AddrBaseReg, O, Modifier);
276 if (IndexReg.getReg()) {
278 printOperand(P, MI, Op+X86::AddrIndexReg, O, Modifier);
279 unsigned ScaleVal = MI->getOperand(Op+X86::AddrScaleAmt).getImm();
281 O << ',' << ScaleVal;
287 static void printMemReference(X86AsmPrinter &P, const MachineInstr *MI,
288 unsigned Op, raw_ostream &O,
289 const char *Modifier = nullptr) {
290 assert(isMem(MI, Op) && "Invalid memory reference!");
291 const MachineOperand &Segment = MI->getOperand(Op+X86::AddrSegmentReg);
292 if (Segment.getReg()) {
293 printOperand(P, MI, Op+X86::AddrSegmentReg, O, Modifier);
296 printLeaMemReference(P, MI, Op, O, Modifier);
299 static void printIntelMemReference(X86AsmPrinter &P, const MachineInstr *MI,
300 unsigned Op, raw_ostream &O,
301 const char *Modifier = nullptr,
302 unsigned AsmVariant = 1) {
303 const MachineOperand &BaseReg = MI->getOperand(Op+X86::AddrBaseReg);
304 unsigned ScaleVal = MI->getOperand(Op+X86::AddrScaleAmt).getImm();
305 const MachineOperand &IndexReg = MI->getOperand(Op+X86::AddrIndexReg);
306 const MachineOperand &DispSpec = MI->getOperand(Op+X86::AddrDisp);
307 const MachineOperand &SegReg = MI->getOperand(Op+X86::AddrSegmentReg);
309 // If this has a segment register, print it.
310 if (SegReg.getReg()) {
311 printOperand(P, MI, Op+X86::AddrSegmentReg, O, Modifier, AsmVariant);
317 bool NeedPlus = false;
318 if (BaseReg.getReg()) {
319 printOperand(P, MI, Op+X86::AddrBaseReg, O, Modifier, AsmVariant);
323 if (IndexReg.getReg()) {
324 if (NeedPlus) O << " + ";
326 O << ScaleVal << '*';
327 printOperand(P, MI, Op+X86::AddrIndexReg, O, Modifier, AsmVariant);
331 if (!DispSpec.isImm()) {
332 if (NeedPlus) O << " + ";
333 printOperand(P, MI, Op+X86::AddrDisp, O, Modifier, AsmVariant);
335 int64_t DispVal = DispSpec.getImm();
336 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg())) {
351 static bool printAsmMRegister(X86AsmPrinter &P, const MachineOperand &MO,
352 char Mode, raw_ostream &O) {
353 unsigned Reg = MO.getReg();
355 default: return true; // Unknown mode.
356 case 'b': // Print QImode register
357 Reg = getX86SubSuperRegister(Reg, MVT::i8);
359 case 'h': // Print QImode high register
360 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
362 case 'w': // Print HImode register
363 Reg = getX86SubSuperRegister(Reg, MVT::i16);
365 case 'k': // Print SImode register
366 Reg = getX86SubSuperRegister(Reg, MVT::i32);
369 // Print 64-bit register names if 64-bit integer registers are available.
370 // Otherwise, print 32-bit register names.
371 MVT::SimpleValueType Ty = P.getSubtarget().is64Bit() ? MVT::i64 : MVT::i32;
372 Reg = getX86SubSuperRegister(Reg, Ty);
376 O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
380 /// PrintAsmOperand - Print out an operand for an inline asm expression.
382 bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
384 const char *ExtraCode, raw_ostream &O) {
385 // Does this asm operand have a single letter operand modifier?
386 if (ExtraCode && ExtraCode[0]) {
387 if (ExtraCode[1] != 0) return true; // Unknown modifier.
389 const MachineOperand &MO = MI->getOperand(OpNo);
391 switch (ExtraCode[0]) {
393 // See if this is a generic print operand
394 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
395 case 'a': // This is an address. Currently only 'i' and 'r' are expected.
396 switch (MO.getType()) {
399 case MachineOperand::MO_Immediate:
402 case MachineOperand::MO_ConstantPoolIndex:
403 case MachineOperand::MO_JumpTableIndex:
404 case MachineOperand::MO_ExternalSymbol:
405 llvm_unreachable("unexpected operand type!");
406 case MachineOperand::MO_GlobalAddress:
407 printSymbolOperand(*this, MO, O);
408 if (Subtarget->isPICStyleRIPRel())
411 case MachineOperand::MO_Register:
413 printOperand(*this, MI, OpNo, O);
418 case 'c': // Don't print "$" before a global var name or constant.
419 switch (MO.getType()) {
421 printOperand(*this, MI, OpNo, O);
423 case MachineOperand::MO_Immediate:
426 case MachineOperand::MO_ConstantPoolIndex:
427 case MachineOperand::MO_JumpTableIndex:
428 case MachineOperand::MO_ExternalSymbol:
429 llvm_unreachable("unexpected operand type!");
430 case MachineOperand::MO_GlobalAddress:
431 printSymbolOperand(*this, MO, O);
436 case 'A': // Print '*' before a register (it must be a register)
439 printOperand(*this, MI, OpNo, O);
444 case 'b': // Print QImode register
445 case 'h': // Print QImode high register
446 case 'w': // Print HImode register
447 case 'k': // Print SImode register
448 case 'q': // Print DImode register
450 return printAsmMRegister(*this, MO, ExtraCode[0], O);
451 printOperand(*this, MI, OpNo, O);
454 case 'P': // This is the operand of a call, treat specially.
455 printPCRelImm(*this, MI, OpNo, O);
458 case 'n': // Negate the immediate or print a '-' before the operand.
459 // Note: this is a temporary solution. It should be handled target
460 // independently as part of the 'MC' work.
469 printOperand(*this, MI, OpNo, O, /*Modifier*/ nullptr, AsmVariant);
473 bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
474 unsigned OpNo, unsigned AsmVariant,
475 const char *ExtraCode,
478 printIntelMemReference(*this, MI, OpNo, O);
482 if (ExtraCode && ExtraCode[0]) {
483 if (ExtraCode[1] != 0) return true; // Unknown modifier.
485 switch (ExtraCode[0]) {
486 default: return true; // Unknown modifier.
487 case 'b': // Print QImode register
488 case 'h': // Print QImode high register
489 case 'w': // Print HImode register
490 case 'k': // Print SImode register
491 case 'q': // Print SImode register
492 // These only apply to registers, ignore on mem.
495 printMemReference(*this, MI, OpNo, O, "H");
497 case 'P': // Don't print @PLT, but do print as memory.
498 printMemReference(*this, MI, OpNo, O, "no-rip");
502 printMemReference(*this, MI, OpNo, O);
506 void X86AsmPrinter::EmitStartOfAsmFile(Module &M) {
507 Triple TT(TM.getTargetTriple());
509 if (TT.isOSBinFormatMachO())
510 OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
512 if (TT.isOSBinFormatCOFF()) {
513 // Emit an absolute @feat.00 symbol. This appears to be some kind of
514 // compiler features bitfield read by link.exe.
515 if (TT.getArch() == Triple::x86) {
516 MCSymbol *S = MMI->getContext().GetOrCreateSymbol(StringRef("@feat.00"));
517 OutStreamer->BeginCOFFSymbolDef(S);
518 OutStreamer->EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_STATIC);
519 OutStreamer->EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_NULL);
520 OutStreamer->EndCOFFSymbolDef();
521 // According to the PE-COFF spec, the LSB of this value marks the object
522 // for "registered SEH". This means that all SEH handler entry points
523 // must be registered in .sxdata. Use of any unregistered handlers will
524 // cause the process to terminate immediately. LLVM does not know how to
525 // register any SEH handlers, so its object files should be safe.
526 OutStreamer->EmitSymbolAttribute(S, MCSA_Global);
527 OutStreamer->EmitAssignment(
528 S, MCConstantExpr::Create(int64_t(1), MMI->getContext()));
534 emitNonLazySymbolPointer(MCStreamer &OutStreamer, MCSymbol *StubLabel,
535 MachineModuleInfoImpl::StubValueTy &MCSym) {
537 OutStreamer.EmitLabel(StubLabel);
538 // .indirect_symbol _foo
539 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
542 // External to current translation unit.
543 OutStreamer.EmitIntValue(0, 4/*size*/);
545 // Internal to current translation unit.
547 // When we place the LSDA into the TEXT section, the type info
548 // pointers need to be indirect and pc-rel. We accomplish this by
549 // using NLPs; however, sometimes the types are local to the file.
550 // We need to fill in the value for the NLP in those cases.
551 OutStreamer.EmitValue(
552 MCSymbolRefExpr::Create(MCSym.getPointer(), OutStreamer.getContext()),
556 MCSymbol *X86AsmPrinter::GetCPISymbol(unsigned CPID) const {
557 if (Subtarget->isTargetKnownWindowsMSVC()) {
558 const MachineConstantPoolEntry &CPE =
559 MF->getConstantPool()->getConstants()[CPID];
560 if (!CPE.isMachineConstantPoolEntry()) {
561 SectionKind Kind = CPE.getSectionKind(TM.getDataLayout());
562 const Constant *C = CPE.Val.ConstVal;
563 if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>(
564 getObjFileLowering().getSectionForConstant(Kind, C))) {
565 if (MCSymbol *Sym = S->getCOMDATSymbol()) {
566 if (Sym->isUndefined())
567 OutStreamer->EmitSymbolAttribute(Sym, MCSA_Global);
574 return AsmPrinter::GetCPISymbol(CPID);
577 void X86AsmPrinter::GenerateExportDirective(const MCSymbol *Sym, bool IsData) {
578 SmallString<128> Directive;
579 raw_svector_ostream OS(Directive);
580 StringRef Name = Sym->getName();
581 Triple TT(TM.getTargetTriple());
583 if (TT.isKnownWindowsMSVCEnvironment())
588 if ((TT.isWindowsGNUEnvironment() || TT.isWindowsCygwinEnvironment()) &&
589 (Name[0] == getDataLayout().getGlobalPrefix()))
590 Name = Name.drop_front();
595 if (TT.isKnownWindowsMSVCEnvironment())
602 OutStreamer->EmitBytes(Directive);
605 void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
606 Triple TT(TM.getTargetTriple());
608 if (TT.isOSBinFormatMachO()) {
609 // All darwin targets use mach-o.
610 MachineModuleInfoMachO &MMIMacho =
611 MMI->getObjFileInfo<MachineModuleInfoMachO>();
613 // Output stubs for dynamically-linked functions.
614 MachineModuleInfoMachO::SymbolListTy Stubs;
616 Stubs = MMIMacho.GetFnStubList();
617 if (!Stubs.empty()) {
618 const MCSection *TheSection =
619 OutContext.getMachOSection("__IMPORT", "__jump_table",
620 MachO::S_SYMBOL_STUBS |
621 MachO::S_ATTR_SELF_MODIFYING_CODE |
622 MachO::S_ATTR_PURE_INSTRUCTIONS,
623 5, SectionKind::getMetadata());
624 OutStreamer->SwitchSection(TheSection);
626 for (const auto &Stub : Stubs) {
628 OutStreamer->EmitLabel(Stub.first);
629 // .indirect_symbol _foo
630 OutStreamer->EmitSymbolAttribute(Stub.second.getPointer(),
631 MCSA_IndirectSymbol);
632 // hlt; hlt; hlt; hlt; hlt hlt = 0xf4.
633 const char HltInsts[] = "\xf4\xf4\xf4\xf4\xf4";
634 OutStreamer->EmitBytes(StringRef(HltInsts, 5));
638 OutStreamer->AddBlankLine();
641 // Output stubs for external and common global variables.
642 Stubs = MMIMacho.GetGVStubList();
643 if (!Stubs.empty()) {
644 const MCSection *TheSection =
645 OutContext.getMachOSection("__IMPORT", "__pointers",
646 MachO::S_NON_LAZY_SYMBOL_POINTERS,
647 SectionKind::getMetadata());
648 OutStreamer->SwitchSection(TheSection);
650 for (auto &Stub : Stubs)
651 emitNonLazySymbolPointer(*OutStreamer, Stub.first, Stub.second);
654 OutStreamer->AddBlankLine();
657 Stubs = MMIMacho.GetHiddenGVStubList();
658 if (!Stubs.empty()) {
659 const MCSection *TheSection =
660 OutContext.getMachOSection("__IMPORT", "__pointers",
661 MachO::S_NON_LAZY_SYMBOL_POINTERS,
662 SectionKind::getMetadata());
663 OutStreamer->SwitchSection(TheSection);
665 for (auto &Stub : Stubs)
666 emitNonLazySymbolPointer(*OutStreamer, Stub.first, Stub.second);
669 OutStreamer->AddBlankLine();
672 SM.serializeToStackMapSection();
674 // Funny Darwin hack: This flag tells the linker that no global symbols
675 // contain code that falls through to other global symbols (e.g. the obvious
676 // implementation of multiple entry points). If this doesn't occur, the
677 // linker can safely perform dead code stripping. Since LLVM never
678 // generates code that does this, it is always safe to set.
679 OutStreamer->EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
682 if (TT.isKnownWindowsMSVCEnvironment() && MMI->usesVAFloatArgument()) {
683 StringRef SymbolName =
684 (TT.getArch() == Triple::x86_64) ? "_fltused" : "__fltused";
685 MCSymbol *S = MMI->getContext().GetOrCreateSymbol(SymbolName);
686 OutStreamer->EmitSymbolAttribute(S, MCSA_Global);
689 if (TT.isOSBinFormatCOFF()) {
690 // Necessary for dllexport support
691 std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals;
693 for (const auto &Function : M)
694 if (Function.hasDLLExportStorageClass() && !Function.isDeclaration())
695 DLLExportedFns.push_back(getSymbol(&Function));
697 for (const auto &Global : M.globals())
698 if (Global.hasDLLExportStorageClass() && !Global.isDeclaration())
699 DLLExportedGlobals.push_back(getSymbol(&Global));
701 for (const auto &Alias : M.aliases()) {
702 if (!Alias.hasDLLExportStorageClass())
705 if (Alias.getType()->getElementType()->isFunctionTy())
706 DLLExportedFns.push_back(getSymbol(&Alias));
708 DLLExportedGlobals.push_back(getSymbol(&Alias));
711 // Output linker support code for dllexported globals on windows.
712 if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
713 const TargetLoweringObjectFileCOFF &TLOFCOFF =
714 static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering());
716 OutStreamer->SwitchSection(TLOFCOFF.getDrectveSection());
718 for (auto & Symbol : DLLExportedGlobals)
719 GenerateExportDirective(Symbol, /*IsData=*/true);
720 for (auto & Symbol : DLLExportedFns)
721 GenerateExportDirective(Symbol, /*IsData=*/false);
725 if (TT.isOSBinFormatELF())
726 SM.serializeToStackMapSection();
729 //===----------------------------------------------------------------------===//
730 // Target Registry Stuff
731 //===----------------------------------------------------------------------===//
733 // Force static initialization.
734 extern "C" void LLVMInitializeX86AsmPrinter() {
735 RegisterAsmPrinter<X86AsmPrinter> X(TheX86_32Target);
736 RegisterAsmPrinter<X86AsmPrinter> Y(TheX86_64Target);