[x86] fix assert with horizontal math + broadcast of vector (PR43402)
[llvm-core.git] / lib / Target / X86 / X86AsmPrinter.cpp
blob7f6927df9db2a841cd9f9e26c09e3f9a531b9d65
1 //===-- X86AsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly --------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains a printer that converts from our internal representation
10 // of machine-dependent LLVM code to X86 machine code.
12 //===----------------------------------------------------------------------===//
14 #include "X86AsmPrinter.h"
15 #include "MCTargetDesc/X86ATTInstPrinter.h"
16 #include "MCTargetDesc/X86BaseInfo.h"
17 #include "MCTargetDesc/X86TargetStreamer.h"
18 #include "TargetInfo/X86TargetInfo.h"
19 #include "X86InstrInfo.h"
20 #include "X86MachineFunctionInfo.h"
21 #include "llvm/BinaryFormat/COFF.h"
22 #include "llvm/BinaryFormat/ELF.h"
23 #include "llvm/CodeGen/MachineConstantPool.h"
24 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
25 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
26 #include "llvm/IR/DerivedTypes.h"
27 #include "llvm/IR/InlineAsm.h"
28 #include "llvm/IR/Mangler.h"
29 #include "llvm/IR/Module.h"
30 #include "llvm/IR/Type.h"
31 #include "llvm/MC/MCCodeEmitter.h"
32 #include "llvm/MC/MCContext.h"
33 #include "llvm/MC/MCExpr.h"
34 #include "llvm/MC/MCSectionCOFF.h"
35 #include "llvm/MC/MCSectionELF.h"
36 #include "llvm/MC/MCSectionMachO.h"
37 #include "llvm/MC/MCStreamer.h"
38 #include "llvm/MC/MCSymbol.h"
39 #include "llvm/Support/Debug.h"
40 #include "llvm/Support/ErrorHandling.h"
41 #include "llvm/Support/MachineValueType.h"
42 #include "llvm/Support/TargetRegistry.h"
43 using namespace llvm;
45 X86AsmPrinter::X86AsmPrinter(TargetMachine &TM,
46 std::unique_ptr<MCStreamer> Streamer)
47 : AsmPrinter(TM, std::move(Streamer)), SM(*this), FM(*this) {}
49 //===----------------------------------------------------------------------===//
50 // Primitive Helper Functions.
51 //===----------------------------------------------------------------------===//
53 /// runOnMachineFunction - Emit the function body.
54 ///
55 bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
56 Subtarget = &MF.getSubtarget<X86Subtarget>();
58 SMShadowTracker.startFunction(MF);
59 CodeEmitter.reset(TM.getTarget().createMCCodeEmitter(
60 *Subtarget->getInstrInfo(), *Subtarget->getRegisterInfo(),
61 MF.getContext()));
63 EmitFPOData =
64 Subtarget->isTargetWin32() && MF.getMMI().getModule()->getCodeViewFlag();
66 SetupMachineFunction(MF);
68 if (Subtarget->isTargetCOFF()) {
69 bool Local = MF.getFunction().hasLocalLinkage();
70 OutStreamer->BeginCOFFSymbolDef(CurrentFnSym);
71 OutStreamer->EmitCOFFSymbolStorageClass(
72 Local ? COFF::IMAGE_SYM_CLASS_STATIC : COFF::IMAGE_SYM_CLASS_EXTERNAL);
73 OutStreamer->EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
74 << COFF::SCT_COMPLEX_TYPE_SHIFT);
75 OutStreamer->EndCOFFSymbolDef();
78 // Emit the rest of the function body.
79 EmitFunctionBody();
81 // Emit the XRay table for this function.
82 emitXRayTable();
84 EmitFPOData = false;
86 // We didn't modify anything.
87 return false;
90 void X86AsmPrinter::EmitFunctionBodyStart() {
91 if (EmitFPOData) {
92 if (auto *XTS =
93 static_cast<X86TargetStreamer *>(OutStreamer->getTargetStreamer()))
94 XTS->emitFPOProc(
95 CurrentFnSym,
96 MF->getInfo<X86MachineFunctionInfo>()->getArgumentStackSize());
100 void X86AsmPrinter::EmitFunctionBodyEnd() {
101 if (EmitFPOData) {
102 if (auto *XTS =
103 static_cast<X86TargetStreamer *>(OutStreamer->getTargetStreamer()))
104 XTS->emitFPOEndProc();
108 /// PrintSymbolOperand - Print a raw symbol reference operand. This handles
109 /// jump tables, constant pools, global address and external symbols, all of
110 /// which print to a label with various suffixes for relocation types etc.
111 void X86AsmPrinter::PrintSymbolOperand(const MachineOperand &MO,
112 raw_ostream &O) {
113 switch (MO.getType()) {
114 default: llvm_unreachable("unknown symbol type!");
115 case MachineOperand::MO_ConstantPoolIndex:
116 GetCPISymbol(MO.getIndex())->print(O, MAI);
117 printOffset(MO.getOffset(), O);
118 break;
119 case MachineOperand::MO_GlobalAddress: {
120 const GlobalValue *GV = MO.getGlobal();
122 MCSymbol *GVSym;
123 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
124 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE)
125 GVSym = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
126 else
127 GVSym = getSymbol(GV);
129 // Handle dllimport linkage.
130 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
131 GVSym = OutContext.getOrCreateSymbol(Twine("__imp_") + GVSym->getName());
132 else if (MO.getTargetFlags() == X86II::MO_COFFSTUB)
133 GVSym =
134 OutContext.getOrCreateSymbol(Twine(".refptr.") + GVSym->getName());
136 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
137 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
138 MCSymbol *Sym = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
139 MachineModuleInfoImpl::StubValueTy &StubSym =
140 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
141 if (!StubSym.getPointer())
142 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(GV),
143 !GV->hasInternalLinkage());
146 // If the name begins with a dollar-sign, enclose it in parens. We do this
147 // to avoid having it look like an integer immediate to the assembler.
148 if (GVSym->getName()[0] != '$')
149 GVSym->print(O, MAI);
150 else {
151 O << '(';
152 GVSym->print(O, MAI);
153 O << ')';
155 printOffset(MO.getOffset(), O);
156 break;
160 switch (MO.getTargetFlags()) {
161 default:
162 llvm_unreachable("Unknown target flag on GV operand");
163 case X86II::MO_NO_FLAG: // No flag.
164 break;
165 case X86II::MO_DARWIN_NONLAZY:
166 case X86II::MO_DLLIMPORT:
167 case X86II::MO_COFFSTUB:
168 // These affect the name of the symbol, not any suffix.
169 break;
170 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
171 O << " + [.-";
172 MF->getPICBaseSymbol()->print(O, MAI);
173 O << ']';
174 break;
175 case X86II::MO_PIC_BASE_OFFSET:
176 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
177 O << '-';
178 MF->getPICBaseSymbol()->print(O, MAI);
179 break;
180 case X86II::MO_TLSGD: O << "@TLSGD"; break;
181 case X86II::MO_TLSLD: O << "@TLSLD"; break;
182 case X86II::MO_TLSLDM: O << "@TLSLDM"; break;
183 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
184 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
185 case X86II::MO_TPOFF: O << "@TPOFF"; break;
186 case X86II::MO_DTPOFF: O << "@DTPOFF"; break;
187 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
188 case X86II::MO_GOTNTPOFF: O << "@GOTNTPOFF"; break;
189 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
190 case X86II::MO_GOT: O << "@GOT"; break;
191 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
192 case X86II::MO_PLT: O << "@PLT"; break;
193 case X86II::MO_TLVP: O << "@TLVP"; break;
194 case X86II::MO_TLVP_PIC_BASE:
195 O << "@TLVP" << '-';
196 MF->getPICBaseSymbol()->print(O, MAI);
197 break;
198 case X86II::MO_SECREL: O << "@SECREL32"; break;
202 void X86AsmPrinter::PrintOperand(const MachineInstr *MI, unsigned OpNo,
203 raw_ostream &O) {
204 const MachineOperand &MO = MI->getOperand(OpNo);
205 const bool IsATT = MI->getInlineAsmDialect() == InlineAsm::AD_ATT;
206 switch (MO.getType()) {
207 default: llvm_unreachable("unknown operand type!");
208 case MachineOperand::MO_Register: {
209 if (IsATT)
210 O << '%';
211 O << X86ATTInstPrinter::getRegisterName(MO.getReg());
212 return;
215 case MachineOperand::MO_Immediate:
216 if (IsATT)
217 O << '$';
218 O << MO.getImm();
219 return;
221 case MachineOperand::MO_GlobalAddress: {
222 if (IsATT)
223 O << '$';
224 PrintSymbolOperand(MO, O);
225 break;
227 case MachineOperand::MO_BlockAddress: {
228 MCSymbol *Sym = GetBlockAddressSymbol(MO.getBlockAddress());
229 Sym->print(O, MAI);
230 break;
235 /// PrintModifiedOperand - Print subregisters based on supplied modifier,
236 /// deferring to PrintOperand() if no modifier was supplied or if operand is not
237 /// a register.
238 void X86AsmPrinter::PrintModifiedOperand(const MachineInstr *MI, unsigned OpNo,
239 raw_ostream &O, const char *Modifier) {
240 const MachineOperand &MO = MI->getOperand(OpNo);
241 if (!Modifier || MO.getType() != MachineOperand::MO_Register)
242 return PrintOperand(MI, OpNo, O);
243 if (MI->getInlineAsmDialect() == InlineAsm::AD_ATT)
244 O << '%';
245 Register Reg = MO.getReg();
246 if (strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
247 unsigned Size = (strcmp(Modifier+6,"64") == 0) ? 64 :
248 (strcmp(Modifier+6,"32") == 0) ? 32 :
249 (strcmp(Modifier+6,"16") == 0) ? 16 : 8;
250 Reg = getX86SubSuperRegister(Reg, Size);
252 O << X86ATTInstPrinter::getRegisterName(Reg);
255 /// PrintPCRelImm - This is used to print an immediate value that ends up
256 /// being encoded as a pc-relative value. These print slightly differently, for
257 /// example, a $ is not emitted.
258 void X86AsmPrinter::PrintPCRelImm(const MachineInstr *MI, unsigned OpNo,
259 raw_ostream &O) {
260 const MachineOperand &MO = MI->getOperand(OpNo);
261 switch (MO.getType()) {
262 default: llvm_unreachable("Unknown pcrel immediate operand");
263 case MachineOperand::MO_Register:
264 // pc-relativeness was handled when computing the value in the reg.
265 PrintOperand(MI, OpNo, O);
266 return;
267 case MachineOperand::MO_Immediate:
268 O << MO.getImm();
269 return;
270 case MachineOperand::MO_GlobalAddress:
271 PrintSymbolOperand(MO, O);
272 return;
276 void X86AsmPrinter::PrintLeaMemReference(const MachineInstr *MI, unsigned OpNo,
277 raw_ostream &O, const char *Modifier) {
278 const MachineOperand &BaseReg = MI->getOperand(OpNo + X86::AddrBaseReg);
279 const MachineOperand &IndexReg = MI->getOperand(OpNo + X86::AddrIndexReg);
280 const MachineOperand &DispSpec = MI->getOperand(OpNo + X86::AddrDisp);
282 // If we really don't want to print out (rip), don't.
283 bool HasBaseReg = BaseReg.getReg() != 0;
284 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
285 BaseReg.getReg() == X86::RIP)
286 HasBaseReg = false;
288 // HasParenPart - True if we will print out the () part of the mem ref.
289 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
291 switch (DispSpec.getType()) {
292 default:
293 llvm_unreachable("unknown operand type!");
294 case MachineOperand::MO_Immediate: {
295 int DispVal = DispSpec.getImm();
296 if (DispVal || !HasParenPart)
297 O << DispVal;
298 break;
300 case MachineOperand::MO_GlobalAddress:
301 case MachineOperand::MO_ConstantPoolIndex:
302 PrintSymbolOperand(DispSpec, O);
303 break;
306 if (Modifier && strcmp(Modifier, "H") == 0)
307 O << "+8";
309 if (HasParenPart) {
310 assert(IndexReg.getReg() != X86::ESP &&
311 "X86 doesn't allow scaling by ESP");
313 O << '(';
314 if (HasBaseReg)
315 PrintModifiedOperand(MI, OpNo + X86::AddrBaseReg, O, Modifier);
317 if (IndexReg.getReg()) {
318 O << ',';
319 PrintModifiedOperand(MI, OpNo + X86::AddrIndexReg, O, Modifier);
320 unsigned ScaleVal = MI->getOperand(OpNo + X86::AddrScaleAmt).getImm();
321 if (ScaleVal != 1)
322 O << ',' << ScaleVal;
324 O << ')';
328 void X86AsmPrinter::PrintMemReference(const MachineInstr *MI, unsigned OpNo,
329 raw_ostream &O, const char *Modifier) {
330 assert(isMem(*MI, OpNo) && "Invalid memory reference!");
331 const MachineOperand &Segment = MI->getOperand(OpNo + X86::AddrSegmentReg);
332 if (Segment.getReg()) {
333 PrintModifiedOperand(MI, OpNo + X86::AddrSegmentReg, O, Modifier);
334 O << ':';
336 PrintLeaMemReference(MI, OpNo, O, Modifier);
339 void X86AsmPrinter::PrintIntelMemReference(const MachineInstr *MI,
340 unsigned OpNo, raw_ostream &O) {
341 const MachineOperand &BaseReg = MI->getOperand(OpNo + X86::AddrBaseReg);
342 unsigned ScaleVal = MI->getOperand(OpNo + X86::AddrScaleAmt).getImm();
343 const MachineOperand &IndexReg = MI->getOperand(OpNo + X86::AddrIndexReg);
344 const MachineOperand &DispSpec = MI->getOperand(OpNo + X86::AddrDisp);
345 const MachineOperand &SegReg = MI->getOperand(OpNo + X86::AddrSegmentReg);
347 // If this has a segment register, print it.
348 if (SegReg.getReg()) {
349 PrintOperand(MI, OpNo + X86::AddrSegmentReg, O);
350 O << ':';
353 O << '[';
355 bool NeedPlus = false;
356 if (BaseReg.getReg()) {
357 PrintOperand(MI, OpNo + X86::AddrBaseReg, O);
358 NeedPlus = true;
361 if (IndexReg.getReg()) {
362 if (NeedPlus) O << " + ";
363 if (ScaleVal != 1)
364 O << ScaleVal << '*';
365 PrintOperand(MI, OpNo + X86::AddrIndexReg, O);
366 NeedPlus = true;
369 if (!DispSpec.isImm()) {
370 if (NeedPlus) O << " + ";
371 PrintOperand(MI, OpNo + X86::AddrDisp, O);
372 } else {
373 int64_t DispVal = DispSpec.getImm();
374 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg())) {
375 if (NeedPlus) {
376 if (DispVal > 0)
377 O << " + ";
378 else {
379 O << " - ";
380 DispVal = -DispVal;
383 O << DispVal;
386 O << ']';
389 static bool printAsmMRegister(X86AsmPrinter &P, const MachineOperand &MO,
390 char Mode, raw_ostream &O) {
391 Register Reg = MO.getReg();
392 bool EmitPercent = true;
394 if (!X86::GR8RegClass.contains(Reg) &&
395 !X86::GR16RegClass.contains(Reg) &&
396 !X86::GR32RegClass.contains(Reg) &&
397 !X86::GR64RegClass.contains(Reg))
398 return true;
400 switch (Mode) {
401 default: return true; // Unknown mode.
402 case 'b': // Print QImode register
403 Reg = getX86SubSuperRegister(Reg, 8);
404 break;
405 case 'h': // Print QImode high register
406 Reg = getX86SubSuperRegister(Reg, 8, true);
407 break;
408 case 'w': // Print HImode register
409 Reg = getX86SubSuperRegister(Reg, 16);
410 break;
411 case 'k': // Print SImode register
412 Reg = getX86SubSuperRegister(Reg, 32);
413 break;
414 case 'V':
415 EmitPercent = false;
416 LLVM_FALLTHROUGH;
417 case 'q':
418 // Print 64-bit register names if 64-bit integer registers are available.
419 // Otherwise, print 32-bit register names.
420 Reg = getX86SubSuperRegister(Reg, P.getSubtarget().is64Bit() ? 64 : 32);
421 break;
424 if (EmitPercent)
425 O << '%';
427 O << X86ATTInstPrinter::getRegisterName(Reg);
428 return false;
431 /// PrintAsmOperand - Print out an operand for an inline asm expression.
433 bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
434 const char *ExtraCode, raw_ostream &O) {
435 // Does this asm operand have a single letter operand modifier?
436 if (ExtraCode && ExtraCode[0]) {
437 if (ExtraCode[1] != 0) return true; // Unknown modifier.
439 const MachineOperand &MO = MI->getOperand(OpNo);
441 switch (ExtraCode[0]) {
442 default:
443 // See if this is a generic print operand
444 return AsmPrinter::PrintAsmOperand(MI, OpNo, ExtraCode, O);
445 case 'a': // This is an address. Currently only 'i' and 'r' are expected.
446 switch (MO.getType()) {
447 default:
448 return true;
449 case MachineOperand::MO_Immediate:
450 O << MO.getImm();
451 return false;
452 case MachineOperand::MO_ConstantPoolIndex:
453 case MachineOperand::MO_JumpTableIndex:
454 case MachineOperand::MO_ExternalSymbol:
455 llvm_unreachable("unexpected operand type!");
456 case MachineOperand::MO_GlobalAddress:
457 PrintSymbolOperand(MO, O);
458 if (Subtarget->isPICStyleRIPRel())
459 O << "(%rip)";
460 return false;
461 case MachineOperand::MO_Register:
462 O << '(';
463 PrintOperand(MI, OpNo, O);
464 O << ')';
465 return false;
468 case 'c': // Don't print "$" before a global var name or constant.
469 switch (MO.getType()) {
470 default:
471 PrintOperand(MI, OpNo, O);
472 break;
473 case MachineOperand::MO_Immediate:
474 O << MO.getImm();
475 break;
476 case MachineOperand::MO_ConstantPoolIndex:
477 case MachineOperand::MO_JumpTableIndex:
478 case MachineOperand::MO_ExternalSymbol:
479 llvm_unreachable("unexpected operand type!");
480 case MachineOperand::MO_GlobalAddress:
481 PrintSymbolOperand(MO, O);
482 break;
484 return false;
486 case 'A': // Print '*' before a register (it must be a register)
487 if (MO.isReg()) {
488 O << '*';
489 PrintOperand(MI, OpNo, O);
490 return false;
492 return true;
494 case 'b': // Print QImode register
495 case 'h': // Print QImode high register
496 case 'w': // Print HImode register
497 case 'k': // Print SImode register
498 case 'q': // Print DImode register
499 case 'V': // Print native register without '%'
500 if (MO.isReg())
501 return printAsmMRegister(*this, MO, ExtraCode[0], O);
502 PrintOperand(MI, OpNo, O);
503 return false;
505 case 'P': // This is the operand of a call, treat specially.
506 PrintPCRelImm(MI, OpNo, O);
507 return false;
509 case 'n': // Negate the immediate or print a '-' before the operand.
510 // Note: this is a temporary solution. It should be handled target
511 // independently as part of the 'MC' work.
512 if (MO.isImm()) {
513 O << -MO.getImm();
514 return false;
516 O << '-';
520 PrintOperand(MI, OpNo, O);
521 return false;
524 bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
525 const char *ExtraCode,
526 raw_ostream &O) {
527 if (MI->getInlineAsmDialect() == InlineAsm::AD_Intel) {
528 PrintIntelMemReference(MI, OpNo, O);
529 return false;
532 if (ExtraCode && ExtraCode[0]) {
533 if (ExtraCode[1] != 0) return true; // Unknown modifier.
535 switch (ExtraCode[0]) {
536 default: return true; // Unknown modifier.
537 case 'b': // Print QImode register
538 case 'h': // Print QImode high register
539 case 'w': // Print HImode register
540 case 'k': // Print SImode register
541 case 'q': // Print SImode register
542 // These only apply to registers, ignore on mem.
543 break;
544 case 'H':
545 PrintMemReference(MI, OpNo, O, "H");
546 return false;
547 case 'P': // Don't print @PLT, but do print as memory.
548 PrintMemReference(MI, OpNo, O, "no-rip");
549 return false;
552 PrintMemReference(MI, OpNo, O, nullptr);
553 return false;
556 void X86AsmPrinter::EmitStartOfAsmFile(Module &M) {
557 const Triple &TT = TM.getTargetTriple();
559 if (TT.isOSBinFormatELF()) {
560 // Assemble feature flags that may require creation of a note section.
561 unsigned FeatureFlagsAnd = 0;
562 if (M.getModuleFlag("cf-protection-branch"))
563 FeatureFlagsAnd |= ELF::GNU_PROPERTY_X86_FEATURE_1_IBT;
564 if (M.getModuleFlag("cf-protection-return"))
565 FeatureFlagsAnd |= ELF::GNU_PROPERTY_X86_FEATURE_1_SHSTK;
567 if (FeatureFlagsAnd) {
568 // Emit a .note.gnu.property section with the flags.
569 if (!TT.isArch32Bit() && !TT.isArch64Bit())
570 llvm_unreachable("CFProtection used on invalid architecture!");
571 MCSection *Cur = OutStreamer->getCurrentSectionOnly();
572 MCSection *Nt = MMI->getContext().getELFSection(
573 ".note.gnu.property", ELF::SHT_NOTE, ELF::SHF_ALLOC);
574 OutStreamer->SwitchSection(Nt);
576 // Emitting note header.
577 int WordSize = TT.isArch64Bit() ? 8 : 4;
578 EmitAlignment(WordSize == 4 ? llvm::Align(4) : llvm::Align(8));
579 OutStreamer->EmitIntValue(4, 4 /*size*/); // data size for "GNU\0"
580 OutStreamer->EmitIntValue(8 + WordSize, 4 /*size*/); // Elf_Prop size
581 OutStreamer->EmitIntValue(ELF::NT_GNU_PROPERTY_TYPE_0, 4 /*size*/);
582 OutStreamer->EmitBytes(StringRef("GNU", 4)); // note name
584 // Emitting an Elf_Prop for the CET properties.
585 OutStreamer->EmitIntValue(ELF::GNU_PROPERTY_X86_FEATURE_1_AND, 4);
586 OutStreamer->EmitIntValue(4, 4); // data size
587 OutStreamer->EmitIntValue(FeatureFlagsAnd, 4); // data
588 EmitAlignment(WordSize == 4 ? llvm::Align(4) : llvm::Align(8)); // padding
590 OutStreamer->endSection(Nt);
591 OutStreamer->SwitchSection(Cur);
595 if (TT.isOSBinFormatMachO())
596 OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
598 if (TT.isOSBinFormatCOFF()) {
599 // Emit an absolute @feat.00 symbol. This appears to be some kind of
600 // compiler features bitfield read by link.exe.
601 MCSymbol *S = MMI->getContext().getOrCreateSymbol(StringRef("@feat.00"));
602 OutStreamer->BeginCOFFSymbolDef(S);
603 OutStreamer->EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_STATIC);
604 OutStreamer->EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_NULL);
605 OutStreamer->EndCOFFSymbolDef();
606 int64_t Feat00Flags = 0;
608 if (TT.getArch() == Triple::x86) {
609 // According to the PE-COFF spec, the LSB of this value marks the object
610 // for "registered SEH". This means that all SEH handler entry points
611 // must be registered in .sxdata. Use of any unregistered handlers will
612 // cause the process to terminate immediately. LLVM does not know how to
613 // register any SEH handlers, so its object files should be safe.
614 Feat00Flags |= 1;
617 if (M.getModuleFlag("cfguardtable"))
618 Feat00Flags |= 0x800; // Object is CFG-aware.
620 OutStreamer->EmitSymbolAttribute(S, MCSA_Global);
621 OutStreamer->EmitAssignment(
622 S, MCConstantExpr::create(Feat00Flags, MMI->getContext()));
624 OutStreamer->EmitSyntaxDirective();
626 // If this is not inline asm and we're in 16-bit
627 // mode prefix assembly with .code16.
628 bool is16 = TT.getEnvironment() == Triple::CODE16;
629 if (M.getModuleInlineAsm().empty() && is16)
630 OutStreamer->EmitAssemblerFlag(MCAF_Code16);
633 static void
634 emitNonLazySymbolPointer(MCStreamer &OutStreamer, MCSymbol *StubLabel,
635 MachineModuleInfoImpl::StubValueTy &MCSym) {
636 // L_foo$stub:
637 OutStreamer.EmitLabel(StubLabel);
638 // .indirect_symbol _foo
639 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
641 if (MCSym.getInt())
642 // External to current translation unit.
643 OutStreamer.EmitIntValue(0, 4/*size*/);
644 else
645 // Internal to current translation unit.
647 // When we place the LSDA into the TEXT section, the type info
648 // pointers need to be indirect and pc-rel. We accomplish this by
649 // using NLPs; however, sometimes the types are local to the file.
650 // We need to fill in the value for the NLP in those cases.
651 OutStreamer.EmitValue(
652 MCSymbolRefExpr::create(MCSym.getPointer(), OutStreamer.getContext()),
653 4 /*size*/);
656 static void emitNonLazyStubs(MachineModuleInfo *MMI, MCStreamer &OutStreamer) {
658 MachineModuleInfoMachO &MMIMacho =
659 MMI->getObjFileInfo<MachineModuleInfoMachO>();
661 // Output stubs for dynamically-linked functions.
662 MachineModuleInfoMachO::SymbolListTy Stubs;
664 // Output stubs for external and common global variables.
665 Stubs = MMIMacho.GetGVStubList();
666 if (!Stubs.empty()) {
667 OutStreamer.SwitchSection(MMI->getContext().getMachOSection(
668 "__IMPORT", "__pointers", MachO::S_NON_LAZY_SYMBOL_POINTERS,
669 SectionKind::getMetadata()));
671 for (auto &Stub : Stubs)
672 emitNonLazySymbolPointer(OutStreamer, Stub.first, Stub.second);
674 Stubs.clear();
675 OutStreamer.AddBlankLine();
679 void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
680 const Triple &TT = TM.getTargetTriple();
682 if (TT.isOSBinFormatMachO()) {
683 // Mach-O uses non-lazy symbol stubs to encode per-TU information into
684 // global table for symbol lookup.
685 emitNonLazyStubs(MMI, *OutStreamer);
687 // Emit stack and fault map information.
688 emitStackMaps(SM);
689 FM.serializeToFaultMapSection();
691 // This flag tells the linker that no global symbols contain code that fall
692 // through to other global symbols (e.g. an implementation of multiple entry
693 // points). If this doesn't occur, the linker can safely perform dead code
694 // stripping. Since LLVM never generates code that does this, it is always
695 // safe to set.
696 OutStreamer->EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
697 } else if (TT.isOSBinFormatCOFF()) {
698 if (MMI->usesMSVCFloatingPoint()) {
699 // In Windows' libcmt.lib, there is a file which is linked in only if the
700 // symbol _fltused is referenced. Linking this in causes some
701 // side-effects:
703 // 1. For x86-32, it will set the x87 rounding mode to 53-bit instead of
704 // 64-bit mantissas at program start.
706 // 2. It links in support routines for floating-point in scanf and printf.
708 // MSVC emits an undefined reference to _fltused when there are any
709 // floating point operations in the program (including calls). A program
710 // that only has: `scanf("%f", &global_float);` may fail to trigger this,
711 // but oh well...that's a documented issue.
712 StringRef SymbolName =
713 (TT.getArch() == Triple::x86) ? "__fltused" : "_fltused";
714 MCSymbol *S = MMI->getContext().getOrCreateSymbol(SymbolName);
715 OutStreamer->EmitSymbolAttribute(S, MCSA_Global);
716 return;
718 emitStackMaps(SM);
719 } else if (TT.isOSBinFormatELF()) {
720 emitStackMaps(SM);
721 FM.serializeToFaultMapSection();
725 //===----------------------------------------------------------------------===//
726 // Target Registry Stuff
727 //===----------------------------------------------------------------------===//
729 // Force static initialization.
730 extern "C" void LLVMInitializeX86AsmPrinter() {
731 RegisterAsmPrinter<X86AsmPrinter> X(getTheX86_32Target());
732 RegisterAsmPrinter<X86AsmPrinter> Y(getTheX86_64Target());