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comparison lib/Target/X86/X86AsmPrinter.cpp @ 0:95c75e76d11b

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children e4204d083e25
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-1:000000000000 0:95c75e76d11b
1 //===-- X86AsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly --------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to X86 machine code.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "X86AsmPrinter.h"
16 #include "InstPrinter/X86ATTInstPrinter.h"
17 #include "X86.h"
18 #include "X86COFFMachineModuleInfo.h"
19 #include "X86MachineFunctionInfo.h"
20 #include "X86TargetMachine.h"
21 #include "llvm/ADT/SmallString.h"
22 #include "llvm/Assembly/Writer.h"
23 #include "llvm/CodeGen/MachineJumpTableInfo.h"
24 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
25 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
26 #include "llvm/DebugInfo.h"
27 #include "llvm/IR/CallingConv.h"
28 #include "llvm/IR/DerivedTypes.h"
29 #include "llvm/IR/Module.h"
30 #include "llvm/IR/Type.h"
31 #include "llvm/MC/MCAsmInfo.h"
32 #include "llvm/MC/MCContext.h"
33 #include "llvm/MC/MCExpr.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"
41 #include "llvm/Target/Mangler.h"
42 #include "llvm/Target/TargetOptions.h"
43 using namespace llvm;
44
45 //===----------------------------------------------------------------------===//
46 // Primitive Helper Functions.
47 //===----------------------------------------------------------------------===//
48
49 /// runOnMachineFunction - Emit the function body.
50 ///
51 bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
52 SetupMachineFunction(MF);
53
54 if (Subtarget->isTargetCOFF() && !Subtarget->isTargetEnvMacho()) {
55 bool Intrn = MF.getFunction()->hasInternalLinkage();
56 OutStreamer.BeginCOFFSymbolDef(CurrentFnSym);
57 OutStreamer.EmitCOFFSymbolStorageClass(Intrn ? COFF::IMAGE_SYM_CLASS_STATIC
58 : COFF::IMAGE_SYM_CLASS_EXTERNAL);
59 OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
60 << COFF::SCT_COMPLEX_TYPE_SHIFT);
61 OutStreamer.EndCOFFSymbolDef();
62 }
63
64 // Have common code print out the function header with linkage info etc.
65 EmitFunctionHeader();
66
67 // Emit the rest of the function body.
68 EmitFunctionBody();
69
70 // We didn't modify anything.
71 return false;
72 }
73
74 /// printSymbolOperand - Print a raw symbol reference operand. This handles
75 /// jump tables, constant pools, global address and external symbols, all of
76 /// which print to a label with various suffixes for relocation types etc.
77 void X86AsmPrinter::printSymbolOperand(const MachineOperand &MO,
78 raw_ostream &O) {
79 switch (MO.getType()) {
80 default: llvm_unreachable("unknown symbol type!");
81 case MachineOperand::MO_JumpTableIndex:
82 O << *GetJTISymbol(MO.getIndex());
83 break;
84 case MachineOperand::MO_ConstantPoolIndex:
85 O << *GetCPISymbol(MO.getIndex());
86 printOffset(MO.getOffset(), O);
87 break;
88 case MachineOperand::MO_GlobalAddress: {
89 const GlobalValue *GV = MO.getGlobal();
90
91 MCSymbol *GVSym;
92 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
93 GVSym = GetSymbolWithGlobalValueBase(GV, "$stub");
94 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
95 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
96 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
97 GVSym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
98 else
99 GVSym = getSymbol(GV);
100
101 // Handle dllimport linkage.
102 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
103 GVSym = OutContext.GetOrCreateSymbol(Twine("__imp_") + GVSym->getName());
104
105 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
106 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
107 MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
108 MachineModuleInfoImpl::StubValueTy &StubSym =
109 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym);
110 if (StubSym.getPointer() == 0)
111 StubSym = MachineModuleInfoImpl::
112 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
113 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
114 MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
115 MachineModuleInfoImpl::StubValueTy &StubSym =
116 MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry(Sym);
117 if (StubSym.getPointer() == 0)
118 StubSym = MachineModuleInfoImpl::
119 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
120 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
121 MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$stub");
122 MachineModuleInfoImpl::StubValueTy &StubSym =
123 MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
124 if (StubSym.getPointer() == 0)
125 StubSym = MachineModuleInfoImpl::
126 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
127 }
128
129 // If the name begins with a dollar-sign, enclose it in parens. We do this
130 // to avoid having it look like an integer immediate to the assembler.
131 if (GVSym->getName()[0] != '$')
132 O << *GVSym;
133 else
134 O << '(' << *GVSym << ')';
135 printOffset(MO.getOffset(), O);
136 break;
137 }
138 case MachineOperand::MO_ExternalSymbol: {
139 const MCSymbol *SymToPrint;
140 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
141 SmallString<128> TempNameStr;
142 TempNameStr += StringRef(MO.getSymbolName());
143 TempNameStr += StringRef("$stub");
144
145 MCSymbol *Sym = GetExternalSymbolSymbol(TempNameStr.str());
146 MachineModuleInfoImpl::StubValueTy &StubSym =
147 MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
148 if (StubSym.getPointer() == 0) {
149 TempNameStr.erase(TempNameStr.end()-5, TempNameStr.end());
150 StubSym = MachineModuleInfoImpl::
151 StubValueTy(OutContext.GetOrCreateSymbol(TempNameStr.str()),
152 true);
153 }
154 SymToPrint = StubSym.getPointer();
155 } else {
156 SymToPrint = GetExternalSymbolSymbol(MO.getSymbolName());
157 }
158
159 // If the name begins with a dollar-sign, enclose it in parens. We do this
160 // to avoid having it look like an integer immediate to the assembler.
161 if (SymToPrint->getName()[0] != '$')
162 O << *SymToPrint;
163 else
164 O << '(' << *SymToPrint << '(';
165 break;
166 }
167 }
168
169 switch (MO.getTargetFlags()) {
170 default:
171 llvm_unreachable("Unknown target flag on GV operand");
172 case X86II::MO_NO_FLAG: // No flag.
173 break;
174 case X86II::MO_DARWIN_NONLAZY:
175 case X86II::MO_DLLIMPORT:
176 case X86II::MO_DARWIN_STUB:
177 // These affect the name of the symbol, not any suffix.
178 break;
179 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
180 O << " + [.-" << *MF->getPICBaseSymbol() << ']';
181 break;
182 case X86II::MO_PIC_BASE_OFFSET:
183 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
184 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
185 O << '-' << *MF->getPICBaseSymbol();
186 break;
187 case X86II::MO_TLSGD: O << "@TLSGD"; break;
188 case X86II::MO_TLSLD: O << "@TLSLD"; break;
189 case X86II::MO_TLSLDM: O << "@TLSLDM"; break;
190 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
191 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
192 case X86II::MO_TPOFF: O << "@TPOFF"; break;
193 case X86II::MO_DTPOFF: O << "@DTPOFF"; break;
194 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
195 case X86II::MO_GOTNTPOFF: O << "@GOTNTPOFF"; break;
196 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
197 case X86II::MO_GOT: O << "@GOT"; break;
198 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
199 case X86II::MO_PLT: O << "@PLT"; break;
200 case X86II::MO_TLVP: O << "@TLVP"; break;
201 case X86II::MO_TLVP_PIC_BASE:
202 O << "@TLVP" << '-' << *MF->getPICBaseSymbol();
203 break;
204 case X86II::MO_SECREL: O << "@SECREL32"; break;
205 }
206 }
207
208 /// printPCRelImm - This is used to print an immediate value that ends up
209 /// being encoded as a pc-relative value. These print slightly differently, for
210 /// example, a $ is not emitted.
211 void X86AsmPrinter::printPCRelImm(const MachineInstr *MI, unsigned OpNo,
212 raw_ostream &O) {
213 const MachineOperand &MO = MI->getOperand(OpNo);
214 switch (MO.getType()) {
215 default: llvm_unreachable("Unknown pcrel immediate operand");
216 case MachineOperand::MO_Register:
217 // pc-relativeness was handled when computing the value in the reg.
218 printOperand(MI, OpNo, O);
219 return;
220 case MachineOperand::MO_Immediate:
221 O << MO.getImm();
222 return;
223 case MachineOperand::MO_MachineBasicBlock:
224 O << *MO.getMBB()->getSymbol();
225 return;
226 case MachineOperand::MO_GlobalAddress:
227 case MachineOperand::MO_ExternalSymbol:
228 printSymbolOperand(MO, O);
229 return;
230 }
231 }
232
233
234 void X86AsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
235 raw_ostream &O, const char *Modifier,
236 unsigned AsmVariant) {
237 const MachineOperand &MO = MI->getOperand(OpNo);
238 switch (MO.getType()) {
239 default: llvm_unreachable("unknown operand type!");
240 case MachineOperand::MO_Register: {
241 // FIXME: Enumerating AsmVariant, so we can remove magic number.
242 if (AsmVariant == 0) O << '%';
243 unsigned Reg = MO.getReg();
244 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
245 MVT::SimpleValueType VT = (strcmp(Modifier+6,"64") == 0) ?
246 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
247 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
248 Reg = getX86SubSuperRegister(Reg, VT);
249 }
250 O << X86ATTInstPrinter::getRegisterName(Reg);
251 return;
252 }
253
254 case MachineOperand::MO_Immediate:
255 if (AsmVariant == 0) O << '$';
256 O << MO.getImm();
257 return;
258
259 case MachineOperand::MO_JumpTableIndex:
260 case MachineOperand::MO_ConstantPoolIndex:
261 case MachineOperand::MO_GlobalAddress:
262 case MachineOperand::MO_ExternalSymbol: {
263 if (AsmVariant == 0) O << '$';
264 printSymbolOperand(MO, O);
265 break;
266 }
267 }
268 }
269
270 void X86AsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
271 raw_ostream &O, const char *Modifier) {
272 const MachineOperand &BaseReg = MI->getOperand(Op);
273 const MachineOperand &IndexReg = MI->getOperand(Op+2);
274 const MachineOperand &DispSpec = MI->getOperand(Op+3);
275
276 // If we really don't want to print out (rip), don't.
277 bool HasBaseReg = BaseReg.getReg() != 0;
278 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
279 BaseReg.getReg() == X86::RIP)
280 HasBaseReg = false;
281
282 // HasParenPart - True if we will print out the () part of the mem ref.
283 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
284
285 if (DispSpec.isImm()) {
286 int DispVal = DispSpec.getImm();
287 if (DispVal || !HasParenPart)
288 O << DispVal;
289 } else {
290 assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
291 DispSpec.isJTI() || DispSpec.isSymbol());
292 printSymbolOperand(MI->getOperand(Op+3), O);
293 }
294
295 if (Modifier && strcmp(Modifier, "H") == 0)
296 O << "+8";
297
298 if (HasParenPart) {
299 assert(IndexReg.getReg() != X86::ESP &&
300 "X86 doesn't allow scaling by ESP");
301
302 O << '(';
303 if (HasBaseReg)
304 printOperand(MI, Op, O, Modifier);
305
306 if (IndexReg.getReg()) {
307 O << ',';
308 printOperand(MI, Op+2, O, Modifier);
309 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
310 if (ScaleVal != 1)
311 O << ',' << ScaleVal;
312 }
313 O << ')';
314 }
315 }
316
317 void X86AsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
318 raw_ostream &O, const char *Modifier) {
319 assert(isMem(MI, Op) && "Invalid memory reference!");
320 const MachineOperand &Segment = MI->getOperand(Op+4);
321 if (Segment.getReg()) {
322 printOperand(MI, Op+4, O, Modifier);
323 O << ':';
324 }
325 printLeaMemReference(MI, Op, O, Modifier);
326 }
327
328 void X86AsmPrinter::printIntelMemReference(const MachineInstr *MI, unsigned Op,
329 raw_ostream &O, const char *Modifier,
330 unsigned AsmVariant){
331 const MachineOperand &BaseReg = MI->getOperand(Op);
332 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
333 const MachineOperand &IndexReg = MI->getOperand(Op+2);
334 const MachineOperand &DispSpec = MI->getOperand(Op+3);
335 const MachineOperand &SegReg = MI->getOperand(Op+4);
336
337 // If this has a segment register, print it.
338 if (SegReg.getReg()) {
339 printOperand(MI, Op+4, O, Modifier, AsmVariant);
340 O << ':';
341 }
342
343 O << '[';
344
345 bool NeedPlus = false;
346 if (BaseReg.getReg()) {
347 printOperand(MI, Op, O, Modifier, AsmVariant);
348 NeedPlus = true;
349 }
350
351 if (IndexReg.getReg()) {
352 if (NeedPlus) O << " + ";
353 if (ScaleVal != 1)
354 O << ScaleVal << '*';
355 printOperand(MI, Op+2, O, Modifier, AsmVariant);
356 NeedPlus = true;
357 }
358
359 if (!DispSpec.isImm()) {
360 if (NeedPlus) O << " + ";
361 printOperand(MI, Op+3, O, Modifier, AsmVariant);
362 } else {
363 int64_t DispVal = DispSpec.getImm();
364 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg())) {
365 if (NeedPlus) {
366 if (DispVal > 0)
367 O << " + ";
368 else {
369 O << " - ";
370 DispVal = -DispVal;
371 }
372 }
373 O << DispVal;
374 }
375 }
376 O << ']';
377 }
378
379 bool X86AsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode,
380 raw_ostream &O) {
381 unsigned Reg = MO.getReg();
382 switch (Mode) {
383 default: return true; // Unknown mode.
384 case 'b': // Print QImode register
385 Reg = getX86SubSuperRegister(Reg, MVT::i8);
386 break;
387 case 'h': // Print QImode high register
388 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
389 break;
390 case 'w': // Print HImode register
391 Reg = getX86SubSuperRegister(Reg, MVT::i16);
392 break;
393 case 'k': // Print SImode register
394 Reg = getX86SubSuperRegister(Reg, MVT::i32);
395 break;
396 case 'q': // Print DImode register
397 // FIXME: gcc will actually print e instead of r for 32-bit.
398 Reg = getX86SubSuperRegister(Reg, MVT::i64);
399 break;
400 }
401
402 O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
403 return false;
404 }
405
406 /// PrintAsmOperand - Print out an operand for an inline asm expression.
407 ///
408 bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
409 unsigned AsmVariant,
410 const char *ExtraCode, raw_ostream &O) {
411 // Does this asm operand have a single letter operand modifier?
412 if (ExtraCode && ExtraCode[0]) {
413 if (ExtraCode[1] != 0) return true; // Unknown modifier.
414
415 const MachineOperand &MO = MI->getOperand(OpNo);
416
417 switch (ExtraCode[0]) {
418 default:
419 // See if this is a generic print operand
420 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
421 case 'a': // This is an address. Currently only 'i' and 'r' are expected.
422 if (MO.isImm()) {
423 O << MO.getImm();
424 return false;
425 }
426 if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
427 printSymbolOperand(MO, O);
428 if (Subtarget->isPICStyleRIPRel())
429 O << "(%rip)";
430 return false;
431 }
432 if (MO.isReg()) {
433 O << '(';
434 printOperand(MI, OpNo, O);
435 O << ')';
436 return false;
437 }
438 return true;
439
440 case 'c': // Don't print "$" before a global var name or constant.
441 if (MO.isImm())
442 O << MO.getImm();
443 else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
444 printSymbolOperand(MO, O);
445 else
446 printOperand(MI, OpNo, O);
447 return false;
448
449 case 'A': // Print '*' before a register (it must be a register)
450 if (MO.isReg()) {
451 O << '*';
452 printOperand(MI, OpNo, O);
453 return false;
454 }
455 return true;
456
457 case 'b': // Print QImode register
458 case 'h': // Print QImode high register
459 case 'w': // Print HImode register
460 case 'k': // Print SImode register
461 case 'q': // Print DImode register
462 if (MO.isReg())
463 return printAsmMRegister(MO, ExtraCode[0], O);
464 printOperand(MI, OpNo, O);
465 return false;
466
467 case 'P': // This is the operand of a call, treat specially.
468 printPCRelImm(MI, OpNo, O);
469 return false;
470
471 case 'n': // Negate the immediate or print a '-' before the operand.
472 // Note: this is a temporary solution. It should be handled target
473 // independently as part of the 'MC' work.
474 if (MO.isImm()) {
475 O << -MO.getImm();
476 return false;
477 }
478 O << '-';
479 }
480 }
481
482 printOperand(MI, OpNo, O, /*Modifier*/ 0, AsmVariant);
483 return false;
484 }
485
486 bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
487 unsigned OpNo, unsigned AsmVariant,
488 const char *ExtraCode,
489 raw_ostream &O) {
490 if (AsmVariant) {
491 printIntelMemReference(MI, OpNo, O);
492 return false;
493 }
494
495 if (ExtraCode && ExtraCode[0]) {
496 if (ExtraCode[1] != 0) return true; // Unknown modifier.
497
498 switch (ExtraCode[0]) {
499 default: return true; // Unknown modifier.
500 case 'b': // Print QImode register
501 case 'h': // Print QImode high register
502 case 'w': // Print HImode register
503 case 'k': // Print SImode register
504 case 'q': // Print SImode register
505 // These only apply to registers, ignore on mem.
506 break;
507 case 'H':
508 printMemReference(MI, OpNo, O, "H");
509 return false;
510 case 'P': // Don't print @PLT, but do print as memory.
511 printMemReference(MI, OpNo, O, "no-rip");
512 return false;
513 }
514 }
515 printMemReference(MI, OpNo, O);
516 return false;
517 }
518
519 void X86AsmPrinter::EmitStartOfAsmFile(Module &M) {
520 if (Subtarget->isTargetEnvMacho())
521 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
522
523 if (Subtarget->isTargetCOFF()) {
524 // Emit an absolute @feat.00 symbol. This appears to be some kind of
525 // compiler features bitfield read by link.exe.
526 if (!Subtarget->is64Bit()) {
527 MCSymbol *S = MMI->getContext().GetOrCreateSymbol(StringRef("@feat.00"));
528 OutStreamer.BeginCOFFSymbolDef(S);
529 OutStreamer.EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_STATIC);
530 OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_NULL);
531 OutStreamer.EndCOFFSymbolDef();
532 // According to the PE-COFF spec, the LSB of this value marks the object
533 // for "registered SEH". This means that all SEH handler entry points
534 // must be registered in .sxdata. Use of any unregistered handlers will
535 // cause the process to terminate immediately. LLVM does not know how to
536 // register any SEH handlers, so its object files should be safe.
537 S->setAbsolute();
538 OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
539 OutStreamer.EmitAssignment(
540 S, MCConstantExpr::Create(int64_t(1), MMI->getContext()));
541 }
542 }
543 }
544
545
546 void X86AsmPrinter::EmitEndOfAsmFile(Module &M) {
547 if (Subtarget->isTargetEnvMacho()) {
548 // All darwin targets use mach-o.
549 MachineModuleInfoMachO &MMIMacho =
550 MMI->getObjFileInfo<MachineModuleInfoMachO>();
551
552 // Output stubs for dynamically-linked functions.
553 MachineModuleInfoMachO::SymbolListTy Stubs;
554
555 Stubs = MMIMacho.GetFnStubList();
556 if (!Stubs.empty()) {
557 const MCSection *TheSection =
558 OutContext.getMachOSection("__IMPORT", "__jump_table",
559 MCSectionMachO::S_SYMBOL_STUBS |
560 MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
561 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
562 5, SectionKind::getMetadata());
563 OutStreamer.SwitchSection(TheSection);
564
565 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
566 // L_foo$stub:
567 OutStreamer.EmitLabel(Stubs[i].first);
568 // .indirect_symbol _foo
569 OutStreamer.EmitSymbolAttribute(Stubs[i].second.getPointer(),
570 MCSA_IndirectSymbol);
571 // hlt; hlt; hlt; hlt; hlt hlt = 0xf4.
572 const char HltInsts[] = "\xf4\xf4\xf4\xf4\xf4";
573 OutStreamer.EmitBytes(StringRef(HltInsts, 5));
574 }
575
576 Stubs.clear();
577 OutStreamer.AddBlankLine();
578 }
579
580 // Output stubs for external and common global variables.
581 Stubs = MMIMacho.GetGVStubList();
582 if (!Stubs.empty()) {
583 const MCSection *TheSection =
584 OutContext.getMachOSection("__IMPORT", "__pointers",
585 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
586 SectionKind::getMetadata());
587 OutStreamer.SwitchSection(TheSection);
588
589 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
590 // L_foo$non_lazy_ptr:
591 OutStreamer.EmitLabel(Stubs[i].first);
592 // .indirect_symbol _foo
593 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
594 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(),
595 MCSA_IndirectSymbol);
596 // .long 0
597 if (MCSym.getInt())
598 // External to current translation unit.
599 OutStreamer.EmitIntValue(0, 4/*size*/);
600 else
601 // Internal to current translation unit.
602 //
603 // When we place the LSDA into the TEXT section, the type info
604 // pointers need to be indirect and pc-rel. We accomplish this by
605 // using NLPs. However, sometimes the types are local to the file. So
606 // we need to fill in the value for the NLP in those cases.
607 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
608 OutContext), 4/*size*/);
609 }
610 Stubs.clear();
611 OutStreamer.AddBlankLine();
612 }
613
614 Stubs = MMIMacho.GetHiddenGVStubList();
615 if (!Stubs.empty()) {
616 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
617 EmitAlignment(2);
618
619 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
620 // L_foo$non_lazy_ptr:
621 OutStreamer.EmitLabel(Stubs[i].first);
622 // .long _foo
623 OutStreamer.EmitValue(MCSymbolRefExpr::
624 Create(Stubs[i].second.getPointer(),
625 OutContext), 4/*size*/);
626 }
627 Stubs.clear();
628 OutStreamer.AddBlankLine();
629 }
630
631 SM.serializeToStackMapSection();
632
633 // Funny Darwin hack: This flag tells the linker that no global symbols
634 // contain code that falls through to other global symbols (e.g. the obvious
635 // implementation of multiple entry points). If this doesn't occur, the
636 // linker can safely perform dead code stripping. Since LLVM never
637 // generates code that does this, it is always safe to set.
638 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
639 }
640
641 if (Subtarget->isTargetWindows() && !Subtarget->isTargetCygMing() &&
642 MMI->usesVAFloatArgument()) {
643 StringRef SymbolName = Subtarget->is64Bit() ? "_fltused" : "__fltused";
644 MCSymbol *S = MMI->getContext().GetOrCreateSymbol(SymbolName);
645 OutStreamer.EmitSymbolAttribute(S, MCSA_Global);
646 }
647
648 if (Subtarget->isTargetCOFF() && !Subtarget->isTargetEnvMacho()) {
649 X86COFFMachineModuleInfo &COFFMMI =
650 MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
651
652 // Emit type information for external functions
653 typedef X86COFFMachineModuleInfo::externals_iterator externals_iterator;
654 for (externals_iterator I = COFFMMI.externals_begin(),
655 E = COFFMMI.externals_end();
656 I != E; ++I) {
657 OutStreamer.BeginCOFFSymbolDef(CurrentFnSym);
658 OutStreamer.EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_EXTERNAL);
659 OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION
660 << COFF::SCT_COMPLEX_TYPE_SHIFT);
661 OutStreamer.EndCOFFSymbolDef();
662 }
663
664 // Necessary for dllexport support
665 std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals;
666
667 const TargetLoweringObjectFileCOFF &TLOFCOFF =
668 static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering());
669
670 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
671 if (I->hasDLLExportLinkage())
672 DLLExportedFns.push_back(getSymbol(I));
673
674 for (Module::const_global_iterator I = M.global_begin(),
675 E = M.global_end(); I != E; ++I)
676 if (I->hasDLLExportLinkage())
677 DLLExportedGlobals.push_back(getSymbol(I));
678
679 // Output linker support code for dllexported globals on windows.
680 if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) {
681 OutStreamer.SwitchSection(TLOFCOFF.getDrectveSection());
682 SmallString<128> name;
683 for (unsigned i = 0, e = DLLExportedGlobals.size(); i != e; ++i) {
684 if (Subtarget->isTargetWindows())
685 name = " /EXPORT:";
686 else
687 name = " -export:";
688 name += DLLExportedGlobals[i]->getName();
689 if (Subtarget->isTargetWindows())
690 name += ",DATA";
691 else
692 name += ",data";
693 OutStreamer.EmitBytes(name);
694 }
695
696 for (unsigned i = 0, e = DLLExportedFns.size(); i != e; ++i) {
697 if (Subtarget->isTargetWindows())
698 name = " /EXPORT:";
699 else
700 name = " -export:";
701 name += DLLExportedFns[i]->getName();
702 OutStreamer.EmitBytes(name);
703 }
704 }
705 }
706
707 if (Subtarget->isTargetELF()) {
708 const TargetLoweringObjectFileELF &TLOFELF =
709 static_cast<const TargetLoweringObjectFileELF &>(getObjFileLowering());
710
711 MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
712
713 // Output stubs for external and common global variables.
714 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
715 if (!Stubs.empty()) {
716 OutStreamer.SwitchSection(TLOFELF.getDataRelSection());
717 const DataLayout *TD = TM.getDataLayout();
718
719 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
720 OutStreamer.EmitLabel(Stubs[i].first);
721 OutStreamer.EmitSymbolValue(Stubs[i].second.getPointer(),
722 TD->getPointerSize());
723 }
724 Stubs.clear();
725 }
726 }
727 }
728
729 //===----------------------------------------------------------------------===//
730 // Target Registry Stuff
731 //===----------------------------------------------------------------------===//
732
733 // Force static initialization.
734 extern "C" void LLVMInitializeX86AsmPrinter() {
735 RegisterAsmPrinter<X86AsmPrinter> X(TheX86_32Target);
736 RegisterAsmPrinter<X86AsmPrinter> Y(TheX86_64Target);
737 }