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/MC/MCInst.h"
30 #include "llvm/CodeGen/DwarfWriter.h"
31 #include "llvm/CodeGen/MachineJumpTableInfo.h"
32 #include "llvm/Support/CommandLine.h"
33 #include "llvm/Support/Mangler.h"
34 #include "llvm/Support/raw_ostream.h"
35 #include "llvm/Target/TargetAsmInfo.h"
36 #include "llvm/Target/TargetOptions.h"
39 STATISTIC(EmittedInsts, "Number of machine instrs printed");
41 static cl::opt<bool> NewAsmPrinter("experimental-asm-printer",
44 static std::string getPICLabelString(unsigned FnNum,
45 const TargetAsmInfo *TAI,
46 const X86Subtarget* Subtarget) {
48 if (Subtarget->isTargetDarwin())
49 label = "\"L" + utostr_32(FnNum) + "$pb\"";
50 else if (Subtarget->isTargetELF())
51 label = ".Lllvm$" + utostr_32(FnNum) + "." "$piclabel";
53 assert(0 && "Don't know how to print PIC label!\n");
58 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
59 const TargetData *TD) {
60 X86MachineFunctionInfo Info;
63 switch (F->getCallingConv()) {
64 case CallingConv::X86_StdCall:
65 Info.setDecorationStyle(StdCall);
67 case CallingConv::X86_FastCall:
68 Info.setDecorationStyle(FastCall);
75 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
76 AI != AE; ++AI, ++argNum) {
77 const Type* Ty = AI->getType();
79 // 'Dereference' type in case of byval parameter attribute
80 if (F->paramHasAttr(argNum, Attribute::ByVal))
81 Ty = cast<PointerType>(Ty)->getElementType();
83 // Size should be aligned to DWORD boundary
84 Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
87 // We're not supporting tooooo huge arguments :)
88 Info.setBytesToPopOnReturn((unsigned int)Size);
92 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
93 /// Don't print things like \\n or \\0.
94 static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
95 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
101 /// decorateName - Query FunctionInfoMap and use this information for various
103 void X86ATTAsmPrinter::decorateName(std::string &Name,
104 const GlobalValue *GV) {
105 const Function *F = dyn_cast<Function>(GV);
108 // We don't want to decorate non-stdcall or non-fastcall functions right now
109 unsigned CC = F->getCallingConv();
110 if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
113 // Decorate names only when we're targeting Cygwin/Mingw32 targets
114 if (!Subtarget->isTargetCygMing())
117 FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
119 const X86MachineFunctionInfo *Info;
120 if (info_item == FunctionInfoMap.end()) {
121 // Calculate apropriate function info and populate map
122 FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
123 Info = &FunctionInfoMap[F];
125 Info = &info_item->second;
128 const FunctionType *FT = F->getFunctionType();
129 switch (Info->getDecorationStyle()) {
133 // "Pure" variadic functions do not receive @0 suffix.
134 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
135 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
136 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
139 // "Pure" variadic functions do not receive @0 suffix.
140 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
141 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
142 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
144 if (Name[0] == '_') {
151 assert(0 && "Unsupported DecorationStyle");
155 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
156 const Function *F = MF.getFunction();
158 decorateName(CurrentFnName, F);
160 SwitchToSection(TAI->SectionForGlobal(F));
162 unsigned FnAlign = 4;
163 if (F->hasFnAttr(Attribute::OptimizeForSize))
165 switch (F->getLinkage()) {
166 default: assert(0 && "Unknown linkage type!");
167 case Function::InternalLinkage: // Symbols default to internal.
168 case Function::PrivateLinkage:
169 EmitAlignment(FnAlign, F);
171 case Function::DLLExportLinkage:
172 case Function::ExternalLinkage:
173 EmitAlignment(FnAlign, F);
174 O << "\t.globl\t" << CurrentFnName << '\n';
176 case Function::LinkOnceAnyLinkage:
177 case Function::LinkOnceODRLinkage:
178 case Function::WeakAnyLinkage:
179 case Function::WeakODRLinkage:
180 EmitAlignment(FnAlign, F);
181 if (Subtarget->isTargetDarwin()) {
182 O << "\t.globl\t" << CurrentFnName << '\n';
183 O << TAI->getWeakDefDirective() << CurrentFnName << '\n';
184 } else if (Subtarget->isTargetCygMing()) {
185 O << "\t.globl\t" << CurrentFnName << "\n"
186 "\t.linkonce discard\n";
188 O << "\t.weak\t" << CurrentFnName << '\n';
193 printVisibility(CurrentFnName, F->getVisibility());
195 if (Subtarget->isTargetELF())
196 O << "\t.type\t" << CurrentFnName << ",@function\n";
197 else if (Subtarget->isTargetCygMing()) {
198 O << "\t.def\t " << CurrentFnName
200 (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
201 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
205 O << CurrentFnName << ":\n";
206 // Add some workaround for linkonce linkage on Cygwin\MinGW
207 if (Subtarget->isTargetCygMing() &&
208 (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
209 O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
212 /// runOnMachineFunction - This uses the printMachineInstruction()
213 /// method to print assembly for each instruction.
215 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
216 const Function *F = MF.getFunction();
218 unsigned CC = F->getCallingConv();
220 SetupMachineFunction(MF);
223 // Populate function information map. Actually, We don't want to populate
224 // non-stdcall or non-fastcall functions' information right now.
225 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
226 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
228 // Print out constants referenced by the function
229 EmitConstantPool(MF.getConstantPool());
231 if (F->hasDLLExportLinkage())
232 DLLExportedFns.insert(Mang->makeNameProper(F->getName(), ""));
234 // Print the 'header' of function
235 emitFunctionHeader(MF);
237 // Emit pre-function debug and/or EH information.
238 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
239 DW->BeginFunction(&MF);
241 // Print out code for the function.
242 bool hasAnyRealCode = false;
243 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
245 // Print a label for the basic block.
246 if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
247 // This is an entry block or a block that's only reachable via a
248 // fallthrough edge. In non-VerboseAsm mode, don't print the label.
250 printBasicBlockLabel(I, true, true, VerboseAsm);
253 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
255 // Print the assembly for the instruction.
257 hasAnyRealCode = true;
258 printMachineInstruction(II);
262 if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
263 // If the function is empty, then we need to emit *something*. Otherwise,
264 // the function's label might be associated with something that it wasn't
265 // meant to be associated with. We emit a noop in this situation.
266 // We are assuming inline asms are code.
270 if (TAI->hasDotTypeDotSizeDirective())
271 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
273 // Emit post-function debug information.
274 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
275 DW->EndFunction(&MF);
277 // Print out jump tables referenced by the function.
278 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
282 // We didn't modify anything.
286 static inline bool shouldPrintGOT(TargetMachine &TM, const X86Subtarget* ST) {
287 return ST->isPICStyleGOT() && TM.getRelocationModel() == Reloc::PIC_;
290 static inline bool shouldPrintPLT(TargetMachine &TM, const X86Subtarget* ST) {
291 return ST->isTargetELF() && TM.getRelocationModel() == Reloc::PIC_ &&
292 (ST->isPICStyleRIPRel() || ST->isPICStyleGOT());
295 static inline bool shouldPrintStub(TargetMachine &TM, const X86Subtarget* ST) {
296 return ST->isPICStyleStub() && TM.getRelocationModel() != Reloc::Static;
299 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
300 const char *Modifier, bool NotRIPRel) {
301 const MachineOperand &MO = MI->getOperand(OpNo);
302 switch (MO.getType()) {
303 case MachineOperand::MO_Register: {
304 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
305 "Virtual registers should not make it this far!");
307 unsigned Reg = MO.getReg();
308 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
309 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
310 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
311 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
312 Reg = getX86SubSuperRegister(Reg, VT);
314 O << TRI->getAsmName(Reg);
318 case MachineOperand::MO_Immediate:
319 if (!Modifier || (strcmp(Modifier, "debug") &&
320 strcmp(Modifier, "mem") &&
321 strcmp(Modifier, "call")))
325 case MachineOperand::MO_MachineBasicBlock:
326 printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
328 case MachineOperand::MO_JumpTableIndex: {
329 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
330 if (!isMemOp) O << '$';
331 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
334 if (TM.getRelocationModel() == Reloc::PIC_) {
335 if (Subtarget->isPICStyleStub())
336 O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
338 else if (Subtarget->isPICStyleGOT())
342 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
346 case MachineOperand::MO_ConstantPoolIndex: {
347 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
348 if (!isMemOp) O << '$';
349 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
352 if (TM.getRelocationModel() == Reloc::PIC_) {
353 if (Subtarget->isPICStyleStub())
354 O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
356 else if (Subtarget->isPICStyleGOT())
360 printOffset(MO.getOffset());
362 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
366 case MachineOperand::MO_GlobalAddress: {
367 bool isCallOp = Modifier && !strcmp(Modifier, "call");
368 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
369 bool needCloseParen = false;
371 const GlobalValue *GV = MO.getGlobal();
372 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
374 // If GV is an alias then use the aliasee for determining
376 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
377 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
380 bool isThreadLocal = GVar && GVar->isThreadLocal();
382 std::string Name = Mang->getValueName(GV);
383 decorateName(Name, GV);
385 if (!isMemOp && !isCallOp)
387 else if (Name[0] == '$') {
388 // The name begins with a dollar-sign. In order to avoid having it look
389 // like an integer immediate to the assembler, enclose it in parens.
391 needCloseParen = true;
394 if (shouldPrintStub(TM, Subtarget)) {
395 // Link-once, declaration, or Weakly-linked global variables need
396 // non-lazily-resolved stubs
397 if (GV->isDeclaration() || GV->isWeakForLinker()) {
398 // Dynamically-resolved functions need a stub for the function.
399 if (isCallOp && isa<Function>(GV)) {
400 // Function stubs are no longer needed for Mac OS X 10.5 and up.
401 if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
404 FnStubs.insert(Name);
405 printSuffixedName(Name, "$stub");
407 } else if (GV->hasHiddenVisibility()) {
408 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
409 // Definition is not definitely in the current translation unit.
412 HiddenGVStubs.insert(Name);
413 printSuffixedName(Name, "$non_lazy_ptr");
416 GVStubs.insert(Name);
417 printSuffixedName(Name, "$non_lazy_ptr");
420 if (GV->hasDLLImportLinkage())
425 if (!isCallOp && TM.getRelocationModel() == Reloc::PIC_)
426 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget);
428 if (GV->hasDLLImportLinkage()) {
434 if (shouldPrintPLT(TM, Subtarget)) {
435 // Assemble call via PLT for externally visible symbols
436 if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
437 !GV->hasLocalLinkage())
440 if (Subtarget->isTargetCygMing() && GV->isDeclaration())
441 // Save function name for later type emission
442 FnStubs.insert(Name);
446 if (GV->hasExternalWeakLinkage())
447 ExtWeakSymbols.insert(GV);
449 printOffset(MO.getOffset());
452 TLSModel::Model model = getTLSModel(GVar, TM.getRelocationModel());
454 case TLSModel::GeneralDynamic:
457 case TLSModel::LocalDynamic:
458 // O << "@TLSLD"; // local dynamic not implemented
461 case TLSModel::InitialExec:
462 if (Subtarget->is64Bit()) {
464 O << "@GOTTPOFF(%rip)";
469 case TLSModel::LocalExec:
470 if (Subtarget->is64Bit())
476 assert (0 && "Unknown TLS model");
478 } else if (isMemOp) {
479 if (shouldPrintGOT(TM, Subtarget)) {
480 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
484 } else if (Subtarget->isPICStyleRIPRel() && !NotRIPRel) {
485 if (TM.getRelocationModel() != Reloc::Static) {
486 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
489 if (needCloseParen) {
490 needCloseParen = false;
495 // Use rip when possible to reduce code size, except when
496 // index or base register are also part of the address. e.g.
497 // foo(%rip)(%rcx,%rax,4) is not legal
507 case MachineOperand::MO_ExternalSymbol: {
508 bool isCallOp = Modifier && !strcmp(Modifier, "call");
509 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
510 bool needCloseParen = false;
511 std::string Name(TAI->getGlobalPrefix());
512 Name += MO.getSymbolName();
513 // Print function stub suffix unless it's Mac OS X 10.5 and up.
514 if (isCallOp && shouldPrintStub(TM, Subtarget) &&
515 !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) {
516 FnStubs.insert(Name);
517 printSuffixedName(Name, "$stub");
520 if (!isMemOp && !isCallOp)
522 else if (Name[0] == '$') {
523 // The name begins with a dollar-sign. In order to avoid having it look
524 // like an integer immediate to the assembler, enclose it in parens.
526 needCloseParen = true;
531 if (shouldPrintPLT(TM, Subtarget)) {
532 std::string GOTName(TAI->getGlobalPrefix());
533 GOTName+="_GLOBAL_OFFSET_TABLE_";
535 // HACK! Emit extra offset to PC during printing GOT offset to
536 // compensate for the size of popl instruction. The resulting code
540 // popl %some_register
541 // addl $_GLOBAL_ADDRESS_TABLE_ + [.-piclabel], %some_register
543 << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << ']';
552 if (!isCallOp && Subtarget->isPICStyleRIPRel())
558 O << "<unknown operand type>"; return;
562 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
563 unsigned char value = MI->getOperand(Op).getImm();
564 assert(value <= 7 && "Invalid ssecc argument!");
566 case 0: O << "eq"; break;
567 case 1: O << "lt"; break;
568 case 2: O << "le"; break;
569 case 3: O << "unord"; break;
570 case 4: O << "neq"; break;
571 case 5: O << "nlt"; break;
572 case 6: O << "nle"; break;
573 case 7: O << "ord"; break;
577 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
578 const char *Modifier,
580 MachineOperand BaseReg = MI->getOperand(Op);
581 MachineOperand IndexReg = MI->getOperand(Op+2);
582 const MachineOperand &DispSpec = MI->getOperand(Op+3);
584 NotRIPRel |= IndexReg.getReg() || BaseReg.getReg();
585 if (DispSpec.isGlobal() ||
588 DispSpec.isSymbol()) {
589 printOperand(MI, Op+3, "mem", NotRIPRel);
591 int DispVal = DispSpec.getImm();
592 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
596 if (IndexReg.getReg() || BaseReg.getReg()) {
597 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
598 unsigned BaseRegOperand = 0, IndexRegOperand = 2;
600 // There are cases where we can end up with ESP/RSP in the indexreg slot.
601 // If this happens, swap the base/index register to support assemblers that
602 // don't work when the index is *SP.
603 if (IndexReg.getReg() == X86::ESP || IndexReg.getReg() == X86::RSP) {
604 assert(ScaleVal == 1 && "Scale not supported for stack pointer!");
605 std::swap(BaseReg, IndexReg);
606 std::swap(BaseRegOperand, IndexRegOperand);
610 if (BaseReg.getReg())
611 printOperand(MI, Op+BaseRegOperand, Modifier);
613 if (IndexReg.getReg()) {
615 printOperand(MI, Op+IndexRegOperand, Modifier);
617 O << ',' << ScaleVal;
623 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
624 const char *Modifier, bool NotRIPRel){
625 assert(isMem(MI, Op) && "Invalid memory reference!");
626 MachineOperand Segment = MI->getOperand(Op+4);
627 if (Segment.getReg()) {
628 printOperand(MI, Op+4, Modifier);
631 printLeaMemReference(MI, Op, Modifier, NotRIPRel);
634 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
635 const MachineBasicBlock *MBB) const {
636 if (!TAI->getSetDirective())
639 // We don't need .set machinery if we have GOT-style relocations
640 if (Subtarget->isPICStyleGOT())
643 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
644 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
645 printBasicBlockLabel(MBB, false, false, false);
646 if (Subtarget->isPICStyleRIPRel())
647 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
648 << '_' << uid << '\n';
650 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << '\n';
653 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
654 std::string label = getPICLabelString(getFunctionNumber(), TAI, Subtarget);
655 O << label << '\n' << label << ':';
659 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
660 const MachineBasicBlock *MBB,
663 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
664 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
666 O << JTEntryDirective << ' ';
668 if (TM.getRelocationModel() == Reloc::PIC_) {
669 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) {
670 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
671 << '_' << uid << "_set_" << MBB->getNumber();
672 } else if (Subtarget->isPICStyleGOT()) {
673 printBasicBlockLabel(MBB, false, false, false);
676 assert(0 && "Don't know how to print MBB label for this PIC mode");
678 printBasicBlockLabel(MBB, false, false, false);
681 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
682 unsigned Reg = MO.getReg();
684 default: return true; // Unknown mode.
685 case 'b': // Print QImode register
686 Reg = getX86SubSuperRegister(Reg, MVT::i8);
688 case 'h': // Print QImode high register
689 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
691 case 'w': // Print HImode register
692 Reg = getX86SubSuperRegister(Reg, MVT::i16);
694 case 'k': // Print SImode register
695 Reg = getX86SubSuperRegister(Reg, MVT::i32);
697 case 'q': // Print DImode register
698 Reg = getX86SubSuperRegister(Reg, MVT::i64);
702 O << '%'<< TRI->getAsmName(Reg);
706 /// PrintAsmOperand - Print out an operand for an inline asm expression.
708 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
710 const char *ExtraCode) {
711 // Does this asm operand have a single letter operand modifier?
712 if (ExtraCode && ExtraCode[0]) {
713 if (ExtraCode[1] != 0) return true; // Unknown modifier.
715 switch (ExtraCode[0]) {
716 default: return true; // Unknown modifier.
717 case 'c': // Don't print "$" before a global var name or constant.
718 printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true);
720 case 'b': // Print QImode register
721 case 'h': // Print QImode high register
722 case 'w': // Print HImode register
723 case 'k': // Print SImode register
724 case 'q': // Print DImode register
725 if (MI->getOperand(OpNo).isReg())
726 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
727 printOperand(MI, OpNo);
730 case 'P': // Don't print @PLT, but do print as memory.
731 printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true);
736 printOperand(MI, OpNo);
740 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
743 const char *ExtraCode) {
744 if (ExtraCode && ExtraCode[0]) {
745 if (ExtraCode[1] != 0) return true; // Unknown modifier.
747 switch (ExtraCode[0]) {
748 default: return true; // Unknown modifier.
749 case 'b': // Print QImode register
750 case 'h': // Print QImode high register
751 case 'w': // Print HImode register
752 case 'k': // Print SImode register
753 case 'q': // Print SImode register
754 // These only apply to registers, ignore on mem.
756 case 'P': // Don't print @PLT, but do print as memory.
757 printMemReference(MI, OpNo, "mem", /*NotRIPRel=*/true);
761 printMemReference(MI, OpNo);
765 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
766 /// AT&T syntax to the current output stream.
768 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
775 TmpInst.setOpcode(MI->getOpcode());
777 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
778 const MachineOperand &MO = MI->getOperand(i);
782 MCOp.MakeReg(MO.getReg());
783 } else if (MO.isImm()) {
784 MCOp.MakeImm(MO.getImm());
786 assert(0 && "Unimp");
789 TmpInst.addOperand(MCOp);
792 if (MI->getOpcode() == X86::LEA64_32r) {
793 // Should handle the 'subreg rewriting' for the lea64_32mem operand.
797 // FIXME: Convert TmpInst.
798 printInstruction(&TmpInst);
802 // Call the autogenerated instruction printer routines.
803 printInstruction(MI);
807 bool X86ATTAsmPrinter::doInitialization(Module &M) {
808 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
809 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
810 return AsmPrinter::doInitialization(M);
813 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
814 const TargetData *TD = TM.getTargetData();
816 if (!GVar->hasInitializer())
817 return; // External global require no code
819 // Check to see if this is a special global used by LLVM, if so, emit it.
820 if (EmitSpecialLLVMGlobal(GVar)) {
821 if (Subtarget->isTargetDarwin() &&
822 TM.getRelocationModel() == Reloc::Static) {
823 if (GVar->getName() == "llvm.global_ctors")
824 O << ".reference .constructors_used\n";
825 else if (GVar->getName() == "llvm.global_dtors")
826 O << ".reference .destructors_used\n";
831 std::string name = Mang->getValueName(GVar);
832 Constant *C = GVar->getInitializer();
833 const Type *Type = C->getType();
834 unsigned Size = TD->getTypeAllocSize(Type);
835 unsigned Align = TD->getPreferredAlignmentLog(GVar);
837 printVisibility(name, GVar->getVisibility());
839 if (Subtarget->isTargetELF())
840 O << "\t.type\t" << name << ",@object\n";
842 SwitchToSection(TAI->SectionForGlobal(GVar));
844 if (C->isNullValue() && !GVar->hasSection() &&
845 !(Subtarget->isTargetDarwin() &&
846 TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
847 // FIXME: This seems to be pretty darwin-specific
848 if (GVar->hasExternalLinkage()) {
849 if (const char *Directive = TAI->getZeroFillDirective()) {
850 O << "\t.globl " << name << '\n';
851 O << Directive << "__DATA, __common, " << name << ", "
852 << Size << ", " << Align << '\n';
857 if (!GVar->isThreadLocal() &&
858 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
859 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
861 if (TAI->getLCOMMDirective() != NULL) {
862 if (GVar->hasLocalLinkage()) {
863 O << TAI->getLCOMMDirective() << name << ',' << Size;
864 if (Subtarget->isTargetDarwin())
866 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
867 O << "\t.globl " << name << '\n'
868 << TAI->getWeakDefDirective() << name << '\n';
869 EmitAlignment(Align, GVar);
872 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
873 PrintUnmangledNameSafely(GVar, O);
876 EmitGlobalConstant(C);
879 O << TAI->getCOMMDirective() << name << ',' << Size;
880 if (TAI->getCOMMDirectiveTakesAlignment())
881 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
884 if (!Subtarget->isTargetCygMing()) {
885 if (GVar->hasLocalLinkage())
886 O << "\t.local\t" << name << '\n';
888 O << TAI->getCOMMDirective() << name << ',' << Size;
889 if (TAI->getCOMMDirectiveTakesAlignment())
890 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
893 O << "\t\t" << TAI->getCommentString() << ' ';
894 PrintUnmangledNameSafely(GVar, O);
901 switch (GVar->getLinkage()) {
902 case GlobalValue::CommonLinkage:
903 case GlobalValue::LinkOnceAnyLinkage:
904 case GlobalValue::LinkOnceODRLinkage:
905 case GlobalValue::WeakAnyLinkage:
906 case GlobalValue::WeakODRLinkage:
907 if (Subtarget->isTargetDarwin()) {
908 O << "\t.globl " << name << '\n'
909 << TAI->getWeakDefDirective() << name << '\n';
910 } else if (Subtarget->isTargetCygMing()) {
911 O << "\t.globl\t" << name << "\n"
912 "\t.linkonce same_size\n";
914 O << "\t.weak\t" << name << '\n';
917 case GlobalValue::DLLExportLinkage:
918 case GlobalValue::AppendingLinkage:
919 // FIXME: appending linkage variables should go into a section of
920 // their name or something. For now, just emit them as external.
921 case GlobalValue::ExternalLinkage:
922 // If external or appending, declare as a global symbol
923 O << "\t.globl " << name << '\n';
925 case GlobalValue::PrivateLinkage:
926 case GlobalValue::InternalLinkage:
929 assert(0 && "Unknown linkage type!");
932 EmitAlignment(Align, GVar);
935 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
936 PrintUnmangledNameSafely(GVar, O);
939 if (TAI->hasDotTypeDotSizeDirective())
940 O << "\t.size\t" << name << ", " << Size << '\n';
942 EmitGlobalConstant(C);
945 /// printGVStub - Print stub for a global value.
947 void X86ATTAsmPrinter::printGVStub(const char *GV, const char *Prefix) {
948 printSuffixedName(GV, "$non_lazy_ptr", Prefix);
949 O << ":\n\t.indirect_symbol ";
950 if (Prefix) O << Prefix;
951 O << GV << "\n\t.long\t0\n";
954 /// printHiddenGVStub - Print stub for a hidden global value.
956 void X86ATTAsmPrinter::printHiddenGVStub(const char *GV, const char *Prefix) {
958 printSuffixedName(GV, "$non_lazy_ptr", Prefix);
959 if (Prefix) O << Prefix;
960 O << ":\n" << TAI->getData32bitsDirective() << GV << '\n';
964 bool X86ATTAsmPrinter::doFinalization(Module &M) {
965 // Print out module-level global variables here.
966 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
968 printModuleLevelGV(I);
970 if (I->hasDLLExportLinkage())
971 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
973 // If the global is a extern weak symbol, remember to emit the weak
975 // FIXME: This is rather hacky, since we'll emit references to ALL weak
976 // stuff, not used. But currently it's the only way to deal with extern weak
977 // initializers hidden deep inside constant expressions.
978 if (I->hasExternalWeakLinkage())
979 ExtWeakSymbols.insert(I);
982 for (Module::const_iterator I = M.begin(), E = M.end();
984 // If the global is a extern weak symbol, remember to emit the weak
986 // FIXME: This is rather hacky, since we'll emit references to ALL weak
987 // stuff, not used. But currently it's the only way to deal with extern weak
988 // initializers hidden deep inside constant expressions.
989 if (I->hasExternalWeakLinkage())
990 ExtWeakSymbols.insert(I);
993 // Output linker support code for dllexported globals
994 if (!DLLExportedGVs.empty())
995 SwitchToDataSection(".section .drectve");
997 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
998 e = DLLExportedGVs.end();
1000 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1002 if (!DLLExportedFns.empty()) {
1003 SwitchToDataSection(".section .drectve");
1006 for (StringSet<>::iterator i = DLLExportedFns.begin(),
1007 e = DLLExportedFns.end();
1009 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1011 if (Subtarget->isTargetDarwin()) {
1012 SwitchToDataSection("");
1014 // Output stubs for dynamically-linked functions
1015 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
1017 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
1018 "self_modifying_code+pure_instructions,5", 0);
1019 const char *p = i->getKeyData();
1020 printSuffixedName(p, "$stub");
1022 "\t.indirect_symbol " << p << "\n"
1023 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
1028 // Print global value stubs.
1029 bool InStubSection = false;
1030 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
1031 // Add the (possibly multiple) personalities to the set of global values.
1032 // Only referenced functions get into the Personalities list.
1033 const std::vector<Function *>& Personalities = MMI->getPersonalities();
1034 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1035 E = Personalities.end(); I != E; ++I) {
1038 if (!InStubSection) {
1039 SwitchToDataSection(
1040 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1041 InStubSection = true;
1043 printGVStub((*I)->getNameStart(), "_");
1047 // Output stubs for external and common global variables.
1048 if (!InStubSection && !GVStubs.empty())
1049 SwitchToDataSection(
1050 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1051 for (StringSet<>::iterator i = GVStubs.begin(), e = GVStubs.end();
1053 printGVStub(i->getKeyData());
1055 if (!HiddenGVStubs.empty()) {
1056 SwitchToSection(TAI->getDataSection());
1057 for (StringSet<>::iterator i = HiddenGVStubs.begin(), e = HiddenGVStubs.end();
1059 printHiddenGVStub(i->getKeyData());
1062 // Emit final debug information.
1063 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
1066 // Funny Darwin hack: This flag tells the linker that no global symbols
1067 // contain code that falls through to other global symbols (e.g. the obvious
1068 // implementation of multiple entry points). If this doesn't occur, the
1069 // linker can safely perform dead code stripping. Since LLVM never
1070 // generates code that does this, it is always safe to set.
1071 O << "\t.subsections_via_symbols\n";
1072 } else if (Subtarget->isTargetCygMing()) {
1073 // Emit type information for external functions
1074 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
1076 O << "\t.def\t " << i->getKeyData()
1077 << ";\t.scl\t" << COFF::C_EXT
1078 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
1082 // Emit final debug information.
1083 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
1085 } else if (Subtarget->isTargetELF()) {
1086 // Emit final debug information.
1087 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
1091 return AsmPrinter::doFinalization(M);
1094 // Include the auto-generated portion of the assembly writer.
1095 #include "X86GenAsmWriter.inc"