1 //===-- X86ATTAsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly -----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to AT&T format assembly
12 // language. This printer is the output mechanism used by `llc'.
14 //===----------------------------------------------------------------------===//
16 #define DEBUG_TYPE "asm-printer"
17 #include "X86ATTAsmPrinter.h"
20 #include "X86MachineFunctionInfo.h"
21 #include "X86TargetMachine.h"
22 #include "X86TargetAsmInfo.h"
23 #include "llvm/CallingConv.h"
24 #include "llvm/DerivedTypes.h"
25 #include "llvm/Module.h"
26 #include "llvm/Type.h"
27 #include "llvm/ADT/Statistic.h"
28 #include "llvm/ADT/StringExtras.h"
29 #include "llvm/CodeGen/DwarfWriter.h"
30 #include "llvm/CodeGen/MachineJumpTableInfo.h"
31 #include "llvm/Support/Mangler.h"
32 #include "llvm/Support/raw_ostream.h"
33 #include "llvm/Target/TargetAsmInfo.h"
34 #include "llvm/Target/TargetOptions.h"
37 STATISTIC(EmittedInsts, "Number of machine instrs printed");
39 static std::string getPICLabelString(unsigned FnNum,
40 const TargetAsmInfo *TAI,
41 const X86Subtarget* Subtarget) {
43 if (Subtarget->isTargetDarwin())
44 label = "\"L" + utostr_32(FnNum) + "$pb\"";
45 else if (Subtarget->isTargetELF())
46 label = ".Lllvm$" + utostr_32(FnNum) + "." "$piclabel";
48 assert(0 && "Don't know how to print PIC label!\n");
53 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
54 const TargetData *TD) {
55 X86MachineFunctionInfo Info;
58 switch (F->getCallingConv()) {
59 case CallingConv::X86_StdCall:
60 Info.setDecorationStyle(StdCall);
62 case CallingConv::X86_FastCall:
63 Info.setDecorationStyle(FastCall);
70 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
71 AI != AE; ++AI, ++argNum) {
72 const Type* Ty = AI->getType();
74 // 'Dereference' type in case of byval parameter attribute
75 if (F->paramHasAttr(argNum, Attribute::ByVal))
76 Ty = cast<PointerType>(Ty)->getElementType();
78 // Size should be aligned to DWORD boundary
79 Size += ((TD->getTypePaddedSize(Ty) + 3)/4)*4;
82 // We're not supporting tooooo huge arguments :)
83 Info.setBytesToPopOnReturn((unsigned int)Size);
87 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
88 /// Don't print things like \\n or \\0.
89 static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
90 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
96 /// decorateName - Query FunctionInfoMap and use this information for various
98 void X86ATTAsmPrinter::decorateName(std::string &Name,
99 const GlobalValue *GV) {
100 const Function *F = dyn_cast<Function>(GV);
103 // We don't want to decorate non-stdcall or non-fastcall functions right now
104 unsigned CC = F->getCallingConv();
105 if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
108 // Decorate names only when we're targeting Cygwin/Mingw32 targets
109 if (!Subtarget->isTargetCygMing())
112 FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
114 const X86MachineFunctionInfo *Info;
115 if (info_item == FunctionInfoMap.end()) {
116 // Calculate apropriate function info and populate map
117 FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
118 Info = &FunctionInfoMap[F];
120 Info = &info_item->second;
123 const FunctionType *FT = F->getFunctionType();
124 switch (Info->getDecorationStyle()) {
128 // "Pure" variadic functions do not receive @0 suffix.
129 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
130 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
131 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
134 // "Pure" variadic functions do not receive @0 suffix.
135 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
136 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
137 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
139 if (Name[0] == '_') {
146 assert(0 && "Unsupported DecorationStyle");
150 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
151 const Function *F = MF.getFunction();
153 decorateName(CurrentFnName, F);
155 SwitchToSection(TAI->SectionForGlobal(F));
157 unsigned FnAlign = 4;
158 if (F->hasFnAttr(Attribute::OptimizeForSize))
160 switch (F->getLinkage()) {
161 default: assert(0 && "Unknown linkage type!");
162 case Function::InternalLinkage: // Symbols default to internal.
163 case Function::PrivateLinkage:
164 EmitAlignment(FnAlign, F);
166 case Function::DLLExportLinkage:
167 case Function::ExternalLinkage:
168 EmitAlignment(FnAlign, F);
169 O << "\t.globl\t" << CurrentFnName << '\n';
171 case Function::LinkOnceAnyLinkage:
172 case Function::LinkOnceODRLinkage:
173 case Function::WeakAnyLinkage:
174 case Function::WeakODRLinkage:
175 EmitAlignment(FnAlign, F);
176 if (Subtarget->isTargetDarwin()) {
177 O << "\t.globl\t" << CurrentFnName << '\n';
178 O << TAI->getWeakDefDirective() << CurrentFnName << '\n';
179 } else if (Subtarget->isTargetCygMing()) {
180 O << "\t.globl\t" << CurrentFnName << "\n"
181 "\t.linkonce discard\n";
183 O << "\t.weak\t" << CurrentFnName << '\n';
188 printVisibility(CurrentFnName, F->getVisibility());
190 if (Subtarget->isTargetELF())
191 O << "\t.type\t" << CurrentFnName << ",@function\n";
192 else if (Subtarget->isTargetCygMing()) {
193 O << "\t.def\t " << CurrentFnName
195 (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
196 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
200 O << CurrentFnName << ":\n";
201 // Add some workaround for linkonce linkage on Cygwin\MinGW
202 if (Subtarget->isTargetCygMing() &&
203 (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
204 O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
207 /// runOnMachineFunction - This uses the printMachineInstruction()
208 /// method to print assembly for each instruction.
210 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
211 const Function *F = MF.getFunction();
213 unsigned CC = F->getCallingConv();
215 SetupMachineFunction(MF);
218 // Populate function information map. Actually, We don't want to populate
219 // non-stdcall or non-fastcall functions' information right now.
220 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
221 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
223 // Print out constants referenced by the function
224 EmitConstantPool(MF.getConstantPool());
226 if (F->hasDLLExportLinkage())
227 DLLExportedFns.insert(Mang->makeNameProper(F->getName(), ""));
229 // Print the 'header' of function
230 emitFunctionHeader(MF);
232 // Emit pre-function debug and/or EH information.
233 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
234 DW->BeginFunction(&MF);
236 // Print out code for the function.
237 bool hasAnyRealCode = false;
238 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
240 // Print a label for the basic block.
241 if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
242 // This is an entry block or a block that's only reachable via a
243 // fallthrough edge. In non-VerboseAsm mode, don't print the label.
245 printBasicBlockLabel(I, true, true, VerboseAsm);
248 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
250 // Print the assembly for the instruction.
252 hasAnyRealCode = true;
253 printMachineInstruction(II);
257 if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
258 // If the function is empty, then we need to emit *something*. Otherwise,
259 // the function's label might be associated with something that it wasn't
260 // meant to be associated with. We emit a noop in this situation.
261 // We are assuming inline asms are code.
265 if (TAI->hasDotTypeDotSizeDirective())
266 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
268 // Emit post-function debug information.
269 if (TAI->doesSupportDebugInformation())
270 DW->EndFunction(&MF);
272 // Print out jump tables referenced by the function.
273 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
277 // We didn't modify anything.
281 static inline bool shouldPrintGOT(TargetMachine &TM, const X86Subtarget* ST) {
282 return ST->isPICStyleGOT() && TM.getRelocationModel() == Reloc::PIC_;
285 static inline bool shouldPrintPLT(TargetMachine &TM, const X86Subtarget* ST) {
286 return ST->isTargetELF() && TM.getRelocationModel() == Reloc::PIC_ &&
287 (ST->isPICStyleRIPRel() || ST->isPICStyleGOT());
290 static inline bool shouldPrintStub(TargetMachine &TM, const X86Subtarget* ST) {
291 return ST->isPICStyleStub() && TM.getRelocationModel() != Reloc::Static;
294 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
295 const char *Modifier, bool NotRIPRel) {
296 const MachineOperand &MO = MI->getOperand(OpNo);
297 switch (MO.getType()) {
298 case MachineOperand::MO_Register: {
299 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
300 "Virtual registers should not make it this far!");
302 unsigned Reg = MO.getReg();
303 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
304 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
305 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
306 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
307 Reg = getX86SubSuperRegister(Reg, VT);
309 O << TRI->getAsmName(Reg);
313 case MachineOperand::MO_Immediate:
314 if (!Modifier || (strcmp(Modifier, "debug") &&
315 strcmp(Modifier, "mem") &&
316 strcmp(Modifier, "call")))
320 case MachineOperand::MO_MachineBasicBlock:
321 printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
323 case MachineOperand::MO_JumpTableIndex: {
324 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
325 if (!isMemOp) O << '$';
326 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
329 if (TM.getRelocationModel() == Reloc::PIC_) {
330 if (Subtarget->isPICStyleStub())
331 O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
333 else if (Subtarget->isPICStyleGOT())
337 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
341 case MachineOperand::MO_ConstantPoolIndex: {
342 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
343 if (!isMemOp) O << '$';
344 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
347 if (TM.getRelocationModel() == Reloc::PIC_) {
348 if (Subtarget->isPICStyleStub())
349 O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
351 else if (Subtarget->isPICStyleGOT())
355 printOffset(MO.getOffset());
357 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
361 case MachineOperand::MO_GlobalAddress: {
362 bool isCallOp = Modifier && !strcmp(Modifier, "call");
363 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
364 bool needCloseParen = false;
366 const GlobalValue *GV = MO.getGlobal();
367 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
369 // If GV is an alias then use the aliasee for determining
371 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
372 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
375 bool isThreadLocal = GVar && GVar->isThreadLocal();
377 std::string Name = Mang->getValueName(GV);
378 decorateName(Name, GV);
380 if (!isMemOp && !isCallOp)
382 else if (Name[0] == '$') {
383 // The name begins with a dollar-sign. In order to avoid having it look
384 // like an integer immediate to the assembler, enclose it in parens.
386 needCloseParen = true;
389 if (shouldPrintStub(TM, Subtarget)) {
390 // Link-once, declaration, or Weakly-linked global variables need
391 // non-lazily-resolved stubs
392 if (GV->isDeclaration() || GV->isWeakForLinker()) {
393 // Dynamically-resolved functions need a stub for the function.
394 if (isCallOp && isa<Function>(GV)) {
395 // Function stubs are no longer needed for Mac OS X 10.5 and up.
396 if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
399 FnStubs.insert(Name);
400 printSuffixedName(Name, "$stub");
402 } else if (GV->hasHiddenVisibility()) {
403 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
404 // Definition is not definitely in the current translation unit.
407 HiddenGVStubs.insert(Name);
408 printSuffixedName(Name, "$non_lazy_ptr");
411 GVStubs.insert(Name);
412 printSuffixedName(Name, "$non_lazy_ptr");
415 if (GV->hasDLLImportLinkage())
420 if (!isCallOp && TM.getRelocationModel() == Reloc::PIC_)
421 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget);
423 if (GV->hasDLLImportLinkage()) {
429 if (shouldPrintPLT(TM, Subtarget)) {
430 // Assemble call via PLT for externally visible symbols
431 if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
432 !GV->hasLocalLinkage())
435 if (Subtarget->isTargetCygMing() && GV->isDeclaration())
436 // Save function name for later type emission
437 FnStubs.insert(Name);
441 if (GV->hasExternalWeakLinkage())
442 ExtWeakSymbols.insert(GV);
444 printOffset(MO.getOffset());
447 TLSModel::Model model = getTLSModel(GVar, TM.getRelocationModel());
449 case TLSModel::GeneralDynamic:
452 case TLSModel::LocalDynamic:
453 // O << "@TLSLD"; // local dynamic not implemented
456 case TLSModel::InitialExec:
457 if (Subtarget->is64Bit())
458 O << "@TLSGD"; // 64 bit intial exec not implemented
462 case TLSModel::LocalExec:
463 if (Subtarget->is64Bit())
464 O << "@TLSGD"; // 64 bit local exec not implemented
469 assert (0 && "Unknown TLS model");
471 } else if (isMemOp) {
472 if (shouldPrintGOT(TM, Subtarget)) {
473 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
477 } else if (Subtarget->isPICStyleRIPRel() && !NotRIPRel) {
478 if (TM.getRelocationModel() != Reloc::Static) {
479 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
482 if (needCloseParen) {
483 needCloseParen = false;
488 // Use rip when possible to reduce code size, except when
489 // index or base register are also part of the address. e.g.
490 // foo(%rip)(%rcx,%rax,4) is not legal
500 case MachineOperand::MO_ExternalSymbol: {
501 bool isCallOp = Modifier && !strcmp(Modifier, "call");
502 bool needCloseParen = false;
503 std::string Name(TAI->getGlobalPrefix());
504 Name += MO.getSymbolName();
505 // Print function stub suffix unless it's Mac OS X 10.5 and up.
506 if (isCallOp && shouldPrintStub(TM, Subtarget) &&
507 !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) {
508 FnStubs.insert(Name);
509 printSuffixedName(Name, "$stub");
514 else if (Name[0] == '$') {
515 // The name begins with a dollar-sign. In order to avoid having it look
516 // like an integer immediate to the assembler, enclose it in parens.
518 needCloseParen = true;
523 if (shouldPrintPLT(TM, Subtarget)) {
524 std::string GOTName(TAI->getGlobalPrefix());
525 GOTName+="_GLOBAL_OFFSET_TABLE_";
527 // HACK! Emit extra offset to PC during printing GOT offset to
528 // compensate for the size of popl instruction. The resulting code
532 // popl %some_register
533 // addl $_GLOBAL_ADDRESS_TABLE_ + [.-piclabel], %some_register
535 << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << ']';
544 if (!isCallOp && Subtarget->isPICStyleRIPRel())
550 O << "<unknown operand type>"; return;
554 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
555 unsigned char value = MI->getOperand(Op).getImm();
556 assert(value <= 7 && "Invalid ssecc argument!");
558 case 0: O << "eq"; break;
559 case 1: O << "lt"; break;
560 case 2: O << "le"; break;
561 case 3: O << "unord"; break;
562 case 4: O << "neq"; break;
563 case 5: O << "nlt"; break;
564 case 6: O << "nle"; break;
565 case 7: O << "ord"; break;
569 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
570 const char *Modifier){
571 assert(isMem(MI, Op) && "Invalid memory reference!");
572 MachineOperand BaseReg = MI->getOperand(Op);
573 MachineOperand IndexReg = MI->getOperand(Op+2);
574 const MachineOperand &DispSpec = MI->getOperand(Op+3);
576 bool NotRIPRel = IndexReg.getReg() || BaseReg.getReg();
577 if (DispSpec.isGlobal() ||
580 printOperand(MI, Op+3, "mem", NotRIPRel);
582 int DispVal = DispSpec.getImm();
583 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
587 if (IndexReg.getReg() || BaseReg.getReg()) {
588 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
589 unsigned BaseRegOperand = 0, IndexRegOperand = 2;
591 // There are cases where we can end up with ESP/RSP in the indexreg slot.
592 // If this happens, swap the base/index register to support assemblers that
593 // don't work when the index is *SP.
594 if (IndexReg.getReg() == X86::ESP || IndexReg.getReg() == X86::RSP) {
595 assert(ScaleVal == 1 && "Scale not supported for stack pointer!");
596 std::swap(BaseReg, IndexReg);
597 std::swap(BaseRegOperand, IndexRegOperand);
601 if (BaseReg.getReg())
602 printOperand(MI, Op+BaseRegOperand, Modifier);
604 if (IndexReg.getReg()) {
606 printOperand(MI, Op+IndexRegOperand, Modifier);
608 O << ',' << ScaleVal;
614 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
615 const MachineBasicBlock *MBB) const {
616 if (!TAI->getSetDirective())
619 // We don't need .set machinery if we have GOT-style relocations
620 if (Subtarget->isPICStyleGOT())
623 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
624 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
625 printBasicBlockLabel(MBB, false, false, false);
626 if (Subtarget->isPICStyleRIPRel())
627 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
628 << '_' << uid << '\n';
630 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << '\n';
633 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
634 std::string label = getPICLabelString(getFunctionNumber(), TAI, Subtarget);
635 O << label << '\n' << label << ':';
639 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
640 const MachineBasicBlock *MBB,
643 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
644 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
646 O << JTEntryDirective << ' ';
648 if (TM.getRelocationModel() == Reloc::PIC_) {
649 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) {
650 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
651 << '_' << uid << "_set_" << MBB->getNumber();
652 } else if (Subtarget->isPICStyleGOT()) {
653 printBasicBlockLabel(MBB, false, false, false);
656 assert(0 && "Don't know how to print MBB label for this PIC mode");
658 printBasicBlockLabel(MBB, false, false, false);
661 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO,
663 unsigned Reg = MO.getReg();
665 default: return true; // Unknown mode.
666 case 'b': // Print QImode register
667 Reg = getX86SubSuperRegister(Reg, MVT::i8);
669 case 'h': // Print QImode high register
670 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
672 case 'w': // Print HImode register
673 Reg = getX86SubSuperRegister(Reg, MVT::i16);
675 case 'k': // Print SImode register
676 Reg = getX86SubSuperRegister(Reg, MVT::i32);
678 case 'q': // Print DImode register
679 Reg = getX86SubSuperRegister(Reg, MVT::i64);
683 O << '%'<< TRI->getAsmName(Reg);
687 /// PrintAsmOperand - Print out an operand for an inline asm expression.
689 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
691 const char *ExtraCode) {
692 // Does this asm operand have a single letter operand modifier?
693 if (ExtraCode && ExtraCode[0]) {
694 if (ExtraCode[1] != 0) return true; // Unknown modifier.
696 switch (ExtraCode[0]) {
697 default: return true; // Unknown modifier.
698 case 'c': // Don't print "$" before a global var name or constant.
699 printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true);
701 case 'b': // Print QImode register
702 case 'h': // Print QImode high register
703 case 'w': // Print HImode register
704 case 'k': // Print SImode register
705 case 'q': // Print DImode register
706 if (MI->getOperand(OpNo).isReg())
707 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
708 printOperand(MI, OpNo);
711 case 'P': // Don't print @PLT, but do print as memory.
712 printOperand(MI, OpNo, "mem");
717 printOperand(MI, OpNo);
721 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
724 const char *ExtraCode) {
725 if (ExtraCode && ExtraCode[0]) {
726 if (ExtraCode[1] != 0) return true; // Unknown modifier.
728 switch (ExtraCode[0]) {
729 default: return true; // Unknown modifier.
730 case 'b': // Print QImode register
731 case 'h': // Print QImode high register
732 case 'w': // Print HImode register
733 case 'k': // Print SImode register
734 case 'q': // Print SImode register
735 // These only apply to registers, ignore on mem.
737 case 'P': // Don't print @PLT, but do print as memory.
738 printOperand(MI, OpNo, "mem");
742 printMemReference(MI, OpNo);
746 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
747 /// AT&T syntax to the current output stream.
749 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
752 // Call the autogenerated instruction printer routines.
753 printInstruction(MI);
757 bool X86ATTAsmPrinter::doInitialization(Module &M) {
759 bool Result = AsmPrinter::doInitialization(M);
761 if (TAI->doesSupportDebugInformation()) {
762 // Let PassManager know we need debug information and relay
763 // the MachineModuleInfo address on to DwarfWriter.
764 // AsmPrinter::doInitialization did this analysis.
765 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
766 DW = getAnalysisIfAvailable<DwarfWriter>();
767 DW->BeginModule(&M, MMI, O, this, TAI);
770 // Darwin wants symbols to be quoted if they have complex names.
771 if (Subtarget->isTargetDarwin())
772 Mang->setUseQuotes(true);
778 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
779 const TargetData *TD = TM.getTargetData();
781 if (!GVar->hasInitializer())
782 return; // External global require no code
784 // Check to see if this is a special global used by LLVM, if so, emit it.
785 if (EmitSpecialLLVMGlobal(GVar)) {
786 if (Subtarget->isTargetDarwin() &&
787 TM.getRelocationModel() == Reloc::Static) {
788 if (GVar->getName() == "llvm.global_ctors")
789 O << ".reference .constructors_used\n";
790 else if (GVar->getName() == "llvm.global_dtors")
791 O << ".reference .destructors_used\n";
796 std::string name = Mang->getValueName(GVar);
797 Constant *C = GVar->getInitializer();
798 const Type *Type = C->getType();
799 unsigned Size = TD->getTypePaddedSize(Type);
800 unsigned Align = TD->getPreferredAlignmentLog(GVar);
802 printVisibility(name, GVar->getVisibility());
804 if (Subtarget->isTargetELF())
805 O << "\t.type\t" << name << ",@object\n";
807 SwitchToSection(TAI->SectionForGlobal(GVar));
809 if (C->isNullValue() && !GVar->hasSection() &&
810 !(Subtarget->isTargetDarwin() &&
811 TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
812 // FIXME: This seems to be pretty darwin-specific
813 if (GVar->hasExternalLinkage()) {
814 if (const char *Directive = TAI->getZeroFillDirective()) {
815 O << "\t.globl " << name << '\n';
816 O << Directive << "__DATA, __common, " << name << ", "
817 << Size << ", " << Align << '\n';
822 if (!GVar->isThreadLocal() &&
823 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
824 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
826 if (TAI->getLCOMMDirective() != NULL) {
827 if (GVar->hasLocalLinkage()) {
828 O << TAI->getLCOMMDirective() << name << ',' << Size;
829 if (Subtarget->isTargetDarwin())
831 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
832 O << "\t.globl " << name << '\n'
833 << TAI->getWeakDefDirective() << name << '\n';
834 EmitAlignment(Align, GVar);
837 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
838 PrintUnmangledNameSafely(GVar, O);
841 EmitGlobalConstant(C);
844 O << TAI->getCOMMDirective() << name << ',' << Size;
845 if (TAI->getCOMMDirectiveTakesAlignment())
846 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
849 if (!Subtarget->isTargetCygMing()) {
850 if (GVar->hasLocalLinkage())
851 O << "\t.local\t" << name << '\n';
853 O << TAI->getCOMMDirective() << name << ',' << Size;
854 if (TAI->getCOMMDirectiveTakesAlignment())
855 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
858 O << "\t\t" << TAI->getCommentString() << ' ';
859 PrintUnmangledNameSafely(GVar, O);
866 switch (GVar->getLinkage()) {
867 case GlobalValue::CommonLinkage:
868 case GlobalValue::LinkOnceAnyLinkage:
869 case GlobalValue::LinkOnceODRLinkage:
870 case GlobalValue::WeakAnyLinkage:
871 case GlobalValue::WeakODRLinkage:
872 if (Subtarget->isTargetDarwin()) {
873 O << "\t.globl " << name << '\n'
874 << TAI->getWeakDefDirective() << name << '\n';
875 } else if (Subtarget->isTargetCygMing()) {
876 O << "\t.globl\t" << name << "\n"
877 "\t.linkonce same_size\n";
879 O << "\t.weak\t" << name << '\n';
882 case GlobalValue::DLLExportLinkage:
883 case GlobalValue::AppendingLinkage:
884 // FIXME: appending linkage variables should go into a section of
885 // their name or something. For now, just emit them as external.
886 case GlobalValue::ExternalLinkage:
887 // If external or appending, declare as a global symbol
888 O << "\t.globl " << name << '\n';
890 case GlobalValue::PrivateLinkage:
891 case GlobalValue::InternalLinkage:
894 assert(0 && "Unknown linkage type!");
897 EmitAlignment(Align, GVar);
900 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
901 PrintUnmangledNameSafely(GVar, O);
904 if (TAI->hasDotTypeDotSizeDirective())
905 O << "\t.size\t" << name << ", " << Size << '\n';
907 EmitGlobalConstant(C);
910 /// printGVStub - Print stub for a global value.
912 void X86ATTAsmPrinter::printGVStub(const char *GV, const char *Prefix) {
913 printSuffixedName(GV, "$non_lazy_ptr", Prefix);
914 O << ":\n\t.indirect_symbol ";
915 if (Prefix) O << Prefix;
916 O << GV << "\n\t.long\t0\n";
919 /// printHiddenGVStub - Print stub for a hidden global value.
921 void X86ATTAsmPrinter::printHiddenGVStub(const char *GV, const char *Prefix) {
923 printSuffixedName(GV, "$non_lazy_ptr", Prefix);
924 if (Prefix) O << Prefix;
925 O << ":\n" << TAI->getData32bitsDirective() << GV << '\n';
929 bool X86ATTAsmPrinter::doFinalization(Module &M) {
930 // Print out module-level global variables here.
931 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
933 printModuleLevelGV(I);
935 if (I->hasDLLExportLinkage())
936 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
938 // If the global is a extern weak symbol, remember to emit the weak
940 // FIXME: This is rather hacky, since we'll emit references to ALL weak stuff,
941 // not used. But currently it's the only way to deal with extern weak
942 // initializers hidden deep inside constant expressions.
943 if (I->hasExternalWeakLinkage())
944 ExtWeakSymbols.insert(I);
947 for (Module::const_iterator I = M.begin(), E = M.end();
949 // If the global is a extern weak symbol, remember to emit the weak
951 // FIXME: This is rather hacky, since we'll emit references to ALL weak stuff,
952 // not used. But currently it's the only way to deal with extern weak
953 // initializers hidden deep inside constant expressions.
954 if (I->hasExternalWeakLinkage())
955 ExtWeakSymbols.insert(I);
958 // Output linker support code for dllexported globals
959 if (!DLLExportedGVs.empty())
960 SwitchToDataSection(".section .drectve");
962 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
963 e = DLLExportedGVs.end();
965 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
967 if (!DLLExportedFns.empty()) {
968 SwitchToDataSection(".section .drectve");
971 for (StringSet<>::iterator i = DLLExportedFns.begin(),
972 e = DLLExportedFns.end();
974 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
976 if (Subtarget->isTargetDarwin()) {
977 SwitchToDataSection("");
979 // Output stubs for dynamically-linked functions
980 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
982 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
983 "self_modifying_code+pure_instructions,5", 0);
984 const char *p = i->getKeyData();
985 printSuffixedName(p, "$stub");
987 "\t.indirect_symbol " << p << "\n"
988 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
993 // Print global value stubs.
994 bool InStubSection = false;
995 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
996 // Add the (possibly multiple) personalities to the set of global values.
997 // Only referenced functions get into the Personalities list.
998 const std::vector<Function *>& Personalities = MMI->getPersonalities();
999 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1000 E = Personalities.end(); I != E; ++I) {
1003 if (!InStubSection) {
1004 SwitchToDataSection(
1005 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1006 InStubSection = true;
1008 printGVStub((*I)->getNameStart(), "_");
1012 // Output stubs for external and common global variables.
1013 if (!InStubSection && !GVStubs.empty())
1014 SwitchToDataSection(
1015 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1016 for (StringSet<>::iterator i = GVStubs.begin(), e = GVStubs.end();
1018 printGVStub(i->getKeyData());
1020 if (!HiddenGVStubs.empty()) {
1021 SwitchToSection(TAI->getDataSection());
1022 for (StringSet<>::iterator i = HiddenGVStubs.begin(), e = HiddenGVStubs.end();
1024 printHiddenGVStub(i->getKeyData());
1027 // Emit final debug information.
1028 DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
1031 // Funny Darwin hack: This flag tells the linker that no global symbols
1032 // contain code that falls through to other global symbols (e.g. the obvious
1033 // implementation of multiple entry points). If this doesn't occur, the
1034 // linker can safely perform dead code stripping. Since LLVM never
1035 // generates code that does this, it is always safe to set.
1036 O << "\t.subsections_via_symbols\n";
1037 } else if (Subtarget->isTargetCygMing()) {
1038 // Emit type information for external functions
1039 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
1041 O << "\t.def\t " << i->getKeyData()
1042 << ";\t.scl\t" << COFF::C_EXT
1043 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
1047 // Emit final debug information.
1048 DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
1050 } else if (Subtarget->isTargetELF()) {
1051 // Emit final debug information.
1052 DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
1056 return AsmPrinter::doFinalization(M);
1059 // Include the auto-generated portion of the assembly writer.
1060 #include "X86GenAsmWriter.inc"