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->getTypeAllocSize(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()) {
459 O << "@GOTTPOFF(%rip)";
464 case TLSModel::LocalExec:
465 if (Subtarget->is64Bit())
471 assert (0 && "Unknown TLS model");
473 } else if (isMemOp) {
474 if (shouldPrintGOT(TM, Subtarget)) {
475 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
479 } else if (Subtarget->isPICStyleRIPRel() && !NotRIPRel) {
480 if (TM.getRelocationModel() != Reloc::Static) {
481 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
484 if (needCloseParen) {
485 needCloseParen = false;
490 // Use rip when possible to reduce code size, except when
491 // index or base register are also part of the address. e.g.
492 // foo(%rip)(%rcx,%rax,4) is not legal
502 case MachineOperand::MO_ExternalSymbol: {
503 bool isCallOp = Modifier && !strcmp(Modifier, "call");
504 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
505 bool needCloseParen = false;
506 std::string Name(TAI->getGlobalPrefix());
507 Name += MO.getSymbolName();
508 // Print function stub suffix unless it's Mac OS X 10.5 and up.
509 if (isCallOp && shouldPrintStub(TM, Subtarget) &&
510 !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) {
511 FnStubs.insert(Name);
512 printSuffixedName(Name, "$stub");
515 if (!isMemOp && !isCallOp)
517 else if (Name[0] == '$') {
518 // The name begins with a dollar-sign. In order to avoid having it look
519 // like an integer immediate to the assembler, enclose it in parens.
521 needCloseParen = true;
526 if (shouldPrintPLT(TM, Subtarget)) {
527 std::string GOTName(TAI->getGlobalPrefix());
528 GOTName+="_GLOBAL_OFFSET_TABLE_";
530 // HACK! Emit extra offset to PC during printing GOT offset to
531 // compensate for the size of popl instruction. The resulting code
535 // popl %some_register
536 // addl $_GLOBAL_ADDRESS_TABLE_ + [.-piclabel], %some_register
538 << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << ']';
547 if (!isCallOp && Subtarget->isPICStyleRIPRel())
553 O << "<unknown operand type>"; return;
557 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
558 unsigned char value = MI->getOperand(Op).getImm();
559 assert(value <= 7 && "Invalid ssecc argument!");
561 case 0: O << "eq"; break;
562 case 1: O << "lt"; break;
563 case 2: O << "le"; break;
564 case 3: O << "unord"; break;
565 case 4: O << "neq"; break;
566 case 5: O << "nlt"; break;
567 case 6: O << "nle"; break;
568 case 7: O << "ord"; break;
572 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
573 const char *Modifier,
575 MachineOperand BaseReg = MI->getOperand(Op);
576 MachineOperand IndexReg = MI->getOperand(Op+2);
577 const MachineOperand &DispSpec = MI->getOperand(Op+3);
579 NotRIPRel |= IndexReg.getReg() || BaseReg.getReg();
580 if (DispSpec.isGlobal() ||
583 DispSpec.isSymbol()) {
584 printOperand(MI, Op+3, "mem", NotRIPRel);
586 int DispVal = DispSpec.getImm();
587 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
591 if (IndexReg.getReg() || BaseReg.getReg()) {
592 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
593 unsigned BaseRegOperand = 0, IndexRegOperand = 2;
595 // There are cases where we can end up with ESP/RSP in the indexreg slot.
596 // If this happens, swap the base/index register to support assemblers that
597 // don't work when the index is *SP.
598 if (IndexReg.getReg() == X86::ESP || IndexReg.getReg() == X86::RSP) {
599 assert(ScaleVal == 1 && "Scale not supported for stack pointer!");
600 std::swap(BaseReg, IndexReg);
601 std::swap(BaseRegOperand, IndexRegOperand);
605 if (BaseReg.getReg())
606 printOperand(MI, Op+BaseRegOperand, Modifier);
608 if (IndexReg.getReg()) {
610 printOperand(MI, Op+IndexRegOperand, Modifier);
612 O << ',' << ScaleVal;
618 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
619 const char *Modifier, bool NotRIPRel){
620 assert(isMem(MI, Op) && "Invalid memory reference!");
621 MachineOperand Segment = MI->getOperand(Op+4);
622 if (Segment.getReg()) {
623 printOperand(MI, Op+4, Modifier);
626 printLeaMemReference(MI, Op, Modifier, NotRIPRel);
629 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
630 const MachineBasicBlock *MBB) const {
631 if (!TAI->getSetDirective())
634 // We don't need .set machinery if we have GOT-style relocations
635 if (Subtarget->isPICStyleGOT())
638 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
639 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
640 printBasicBlockLabel(MBB, false, false, false);
641 if (Subtarget->isPICStyleRIPRel())
642 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
643 << '_' << uid << '\n';
645 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << '\n';
648 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
649 std::string label = getPICLabelString(getFunctionNumber(), TAI, Subtarget);
650 O << label << '\n' << label << ':';
654 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
655 const MachineBasicBlock *MBB,
658 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
659 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
661 O << JTEntryDirective << ' ';
663 if (TM.getRelocationModel() == Reloc::PIC_) {
664 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) {
665 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
666 << '_' << uid << "_set_" << MBB->getNumber();
667 } else if (Subtarget->isPICStyleGOT()) {
668 printBasicBlockLabel(MBB, false, false, false);
671 assert(0 && "Don't know how to print MBB label for this PIC mode");
673 printBasicBlockLabel(MBB, false, false, false);
676 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO,
678 unsigned Reg = MO.getReg();
680 default: return true; // Unknown mode.
681 case 'b': // Print QImode register
682 Reg = getX86SubSuperRegister(Reg, MVT::i8);
684 case 'h': // Print QImode high register
685 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
687 case 'w': // Print HImode register
688 Reg = getX86SubSuperRegister(Reg, MVT::i16);
690 case 'k': // Print SImode register
691 Reg = getX86SubSuperRegister(Reg, MVT::i32);
693 case 'q': // Print DImode register
694 Reg = getX86SubSuperRegister(Reg, MVT::i64);
698 O << '%'<< TRI->getAsmName(Reg);
702 /// PrintAsmOperand - Print out an operand for an inline asm expression.
704 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
706 const char *ExtraCode) {
707 // Does this asm operand have a single letter operand modifier?
708 if (ExtraCode && ExtraCode[0]) {
709 if (ExtraCode[1] != 0) return true; // Unknown modifier.
711 switch (ExtraCode[0]) {
712 default: return true; // Unknown modifier.
713 case 'c': // Don't print "$" before a global var name or constant.
714 printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true);
716 case 'b': // Print QImode register
717 case 'h': // Print QImode high register
718 case 'w': // Print HImode register
719 case 'k': // Print SImode register
720 case 'q': // Print DImode register
721 if (MI->getOperand(OpNo).isReg())
722 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
723 printOperand(MI, OpNo);
726 case 'P': // Don't print @PLT, but do print as memory.
727 printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true);
732 printOperand(MI, OpNo);
736 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
739 const char *ExtraCode) {
740 if (ExtraCode && ExtraCode[0]) {
741 if (ExtraCode[1] != 0) return true; // Unknown modifier.
743 switch (ExtraCode[0]) {
744 default: return true; // Unknown modifier.
745 case 'b': // Print QImode register
746 case 'h': // Print QImode high register
747 case 'w': // Print HImode register
748 case 'k': // Print SImode register
749 case 'q': // Print SImode register
750 // These only apply to registers, ignore on mem.
752 case 'P': // Don't print @PLT, but do print as memory.
753 printMemReference(MI, OpNo, "mem", /*NotRIPRel=*/true);
757 printMemReference(MI, OpNo);
761 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
762 /// AT&T syntax to the current output stream.
764 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
767 // Call the autogenerated instruction printer routines.
768 printInstruction(MI);
772 bool X86ATTAsmPrinter::doInitialization(Module &M) {
774 bool Result = AsmPrinter::doInitialization(M);
776 if (TAI->doesSupportDebugInformation()) {
777 // Let PassManager know we need debug information and relay
778 // the MachineModuleInfo address on to DwarfWriter.
779 // AsmPrinter::doInitialization did this analysis.
780 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
781 DW = getAnalysisIfAvailable<DwarfWriter>();
782 DW->BeginModule(&M, MMI, O, this, TAI);
785 // Darwin wants symbols to be quoted if they have complex names.
786 if (Subtarget->isTargetDarwin())
787 Mang->setUseQuotes(true);
793 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
794 const TargetData *TD = TM.getTargetData();
796 if (!GVar->hasInitializer())
797 return; // External global require no code
799 // Check to see if this is a special global used by LLVM, if so, emit it.
800 if (EmitSpecialLLVMGlobal(GVar)) {
801 if (Subtarget->isTargetDarwin() &&
802 TM.getRelocationModel() == Reloc::Static) {
803 if (GVar->getName() == "llvm.global_ctors")
804 O << ".reference .constructors_used\n";
805 else if (GVar->getName() == "llvm.global_dtors")
806 O << ".reference .destructors_used\n";
811 std::string name = Mang->getValueName(GVar);
812 Constant *C = GVar->getInitializer();
813 const Type *Type = C->getType();
814 unsigned Size = TD->getTypeAllocSize(Type);
815 unsigned Align = TD->getPreferredAlignmentLog(GVar);
817 printVisibility(name, GVar->getVisibility());
819 if (Subtarget->isTargetELF())
820 O << "\t.type\t" << name << ",@object\n";
822 SwitchToSection(TAI->SectionForGlobal(GVar));
824 if (C->isNullValue() && !GVar->hasSection() &&
825 !(Subtarget->isTargetDarwin() &&
826 TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
827 // FIXME: This seems to be pretty darwin-specific
828 if (GVar->hasExternalLinkage()) {
829 if (const char *Directive = TAI->getZeroFillDirective()) {
830 O << "\t.globl " << name << '\n';
831 O << Directive << "__DATA, __common, " << name << ", "
832 << Size << ", " << Align << '\n';
837 if (!GVar->isThreadLocal() &&
838 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
839 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
841 if (TAI->getLCOMMDirective() != NULL) {
842 if (GVar->hasLocalLinkage()) {
843 O << TAI->getLCOMMDirective() << name << ',' << Size;
844 if (Subtarget->isTargetDarwin())
846 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
847 O << "\t.globl " << name << '\n'
848 << TAI->getWeakDefDirective() << name << '\n';
849 EmitAlignment(Align, GVar);
852 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
853 PrintUnmangledNameSafely(GVar, O);
856 EmitGlobalConstant(C);
859 O << TAI->getCOMMDirective() << name << ',' << Size;
860 if (TAI->getCOMMDirectiveTakesAlignment())
861 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
864 if (!Subtarget->isTargetCygMing()) {
865 if (GVar->hasLocalLinkage())
866 O << "\t.local\t" << name << '\n';
868 O << TAI->getCOMMDirective() << name << ',' << Size;
869 if (TAI->getCOMMDirectiveTakesAlignment())
870 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
873 O << "\t\t" << TAI->getCommentString() << ' ';
874 PrintUnmangledNameSafely(GVar, O);
881 switch (GVar->getLinkage()) {
882 case GlobalValue::CommonLinkage:
883 case GlobalValue::LinkOnceAnyLinkage:
884 case GlobalValue::LinkOnceODRLinkage:
885 case GlobalValue::WeakAnyLinkage:
886 case GlobalValue::WeakODRLinkage:
887 if (Subtarget->isTargetDarwin()) {
888 O << "\t.globl " << name << '\n'
889 << TAI->getWeakDefDirective() << name << '\n';
890 } else if (Subtarget->isTargetCygMing()) {
891 O << "\t.globl\t" << name << "\n"
892 "\t.linkonce same_size\n";
894 O << "\t.weak\t" << name << '\n';
897 case GlobalValue::DLLExportLinkage:
898 case GlobalValue::AppendingLinkage:
899 // FIXME: appending linkage variables should go into a section of
900 // their name or something. For now, just emit them as external.
901 case GlobalValue::ExternalLinkage:
902 // If external or appending, declare as a global symbol
903 O << "\t.globl " << name << '\n';
905 case GlobalValue::PrivateLinkage:
906 case GlobalValue::InternalLinkage:
909 assert(0 && "Unknown linkage type!");
912 EmitAlignment(Align, GVar);
915 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
916 PrintUnmangledNameSafely(GVar, O);
919 if (TAI->hasDotTypeDotSizeDirective())
920 O << "\t.size\t" << name << ", " << Size << '\n';
922 EmitGlobalConstant(C);
925 /// printGVStub - Print stub for a global value.
927 void X86ATTAsmPrinter::printGVStub(const char *GV, const char *Prefix) {
928 printSuffixedName(GV, "$non_lazy_ptr", Prefix);
929 O << ":\n\t.indirect_symbol ";
930 if (Prefix) O << Prefix;
931 O << GV << "\n\t.long\t0\n";
934 /// printHiddenGVStub - Print stub for a hidden global value.
936 void X86ATTAsmPrinter::printHiddenGVStub(const char *GV, const char *Prefix) {
938 printSuffixedName(GV, "$non_lazy_ptr", Prefix);
939 if (Prefix) O << Prefix;
940 O << ":\n" << TAI->getData32bitsDirective() << GV << '\n';
944 bool X86ATTAsmPrinter::doFinalization(Module &M) {
945 // Print out module-level global variables here.
946 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
948 printModuleLevelGV(I);
950 if (I->hasDLLExportLinkage())
951 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
953 // If the global is a extern weak symbol, remember to emit the weak
955 // FIXME: This is rather hacky, since we'll emit references to ALL weak stuff,
956 // not used. But currently it's the only way to deal with extern weak
957 // initializers hidden deep inside constant expressions.
958 if (I->hasExternalWeakLinkage())
959 ExtWeakSymbols.insert(I);
962 for (Module::const_iterator I = M.begin(), E = M.end();
964 // If the global is a extern weak symbol, remember to emit the weak
966 // FIXME: This is rather hacky, since we'll emit references to ALL weak stuff,
967 // not used. But currently it's the only way to deal with extern weak
968 // initializers hidden deep inside constant expressions.
969 if (I->hasExternalWeakLinkage())
970 ExtWeakSymbols.insert(I);
973 // Output linker support code for dllexported globals
974 if (!DLLExportedGVs.empty())
975 SwitchToDataSection(".section .drectve");
977 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
978 e = DLLExportedGVs.end();
980 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
982 if (!DLLExportedFns.empty()) {
983 SwitchToDataSection(".section .drectve");
986 for (StringSet<>::iterator i = DLLExportedFns.begin(),
987 e = DLLExportedFns.end();
989 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
991 if (Subtarget->isTargetDarwin()) {
992 SwitchToDataSection("");
994 // Output stubs for dynamically-linked functions
995 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
997 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
998 "self_modifying_code+pure_instructions,5", 0);
999 const char *p = i->getKeyData();
1000 printSuffixedName(p, "$stub");
1002 "\t.indirect_symbol " << p << "\n"
1003 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
1008 // Print global value stubs.
1009 bool InStubSection = false;
1010 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
1011 // Add the (possibly multiple) personalities to the set of global values.
1012 // Only referenced functions get into the Personalities list.
1013 const std::vector<Function *>& Personalities = MMI->getPersonalities();
1014 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1015 E = Personalities.end(); I != E; ++I) {
1018 if (!InStubSection) {
1019 SwitchToDataSection(
1020 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1021 InStubSection = true;
1023 printGVStub((*I)->getNameStart(), "_");
1027 // Output stubs for external and common global variables.
1028 if (!InStubSection && !GVStubs.empty())
1029 SwitchToDataSection(
1030 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1031 for (StringSet<>::iterator i = GVStubs.begin(), e = GVStubs.end();
1033 printGVStub(i->getKeyData());
1035 if (!HiddenGVStubs.empty()) {
1036 SwitchToSection(TAI->getDataSection());
1037 for (StringSet<>::iterator i = HiddenGVStubs.begin(), e = HiddenGVStubs.end();
1039 printHiddenGVStub(i->getKeyData());
1042 // Emit final debug information.
1043 DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
1046 // Funny Darwin hack: This flag tells the linker that no global symbols
1047 // contain code that falls through to other global symbols (e.g. the obvious
1048 // implementation of multiple entry points). If this doesn't occur, the
1049 // linker can safely perform dead code stripping. Since LLVM never
1050 // generates code that does this, it is always safe to set.
1051 O << "\t.subsections_via_symbols\n";
1052 } else if (Subtarget->isTargetCygMing()) {
1053 // Emit type information for external functions
1054 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
1056 O << "\t.def\t " << i->getKeyData()
1057 << ";\t.scl\t" << COFF::C_EXT
1058 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
1062 // Emit final debug information.
1063 DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
1065 } else if (Subtarget->isTargetELF()) {
1066 // Emit final debug information.
1067 DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
1071 return AsmPrinter::doFinalization(M);
1074 // Include the auto-generated portion of the assembly writer.
1075 #include "X86GenAsmWriter.inc"