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/MDNode.h"
27 #include "llvm/Type.h"
28 #include "llvm/ADT/Statistic.h"
29 #include "llvm/ADT/StringExtras.h"
30 #include "llvm/MC/MCContext.h"
31 #include "llvm/MC/MCInst.h"
32 #include "llvm/MC/MCStreamer.h"
33 #include "llvm/CodeGen/DwarfWriter.h"
34 #include "llvm/CodeGen/MachineJumpTableInfo.h"
35 #include "llvm/Support/CommandLine.h"
36 #include "llvm/Support/Mangler.h"
37 #include "llvm/Support/raw_ostream.h"
38 #include "llvm/Target/TargetAsmInfo.h"
39 #include "llvm/Target/TargetOptions.h"
42 STATISTIC(EmittedInsts, "Number of machine instrs printed");
44 static cl::opt<bool> NewAsmPrinter("experimental-asm-printer",
47 //===----------------------------------------------------------------------===//
48 // Primitive Helper Functions.
49 //===----------------------------------------------------------------------===//
51 void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
52 if (Subtarget->isTargetDarwin())
53 O << "\"L" << getFunctionNumber() << "$pb\"";
54 else if (Subtarget->isTargetELF())
55 O << ".Lllvm$" << getFunctionNumber() << ".$piclabel";
57 assert(0 && "Don't know how to print PIC label!\n");
60 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
61 /// Don't print things like \\n or \\0.
62 static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
63 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
69 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
70 const TargetData *TD) {
71 X86MachineFunctionInfo Info;
74 switch (F->getCallingConv()) {
75 case CallingConv::X86_StdCall:
76 Info.setDecorationStyle(StdCall);
78 case CallingConv::X86_FastCall:
79 Info.setDecorationStyle(FastCall);
86 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
87 AI != AE; ++AI, ++argNum) {
88 const Type* Ty = AI->getType();
90 // 'Dereference' type in case of byval parameter attribute
91 if (F->paramHasAttr(argNum, Attribute::ByVal))
92 Ty = cast<PointerType>(Ty)->getElementType();
94 // Size should be aligned to DWORD boundary
95 Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
98 // We're not supporting tooooo huge arguments :)
99 Info.setBytesToPopOnReturn((unsigned int)Size);
103 /// decorateName - Query FunctionInfoMap and use this information for various
105 void X86ATTAsmPrinter::decorateName(std::string &Name,
106 const GlobalValue *GV) {
107 const Function *F = dyn_cast<Function>(GV);
110 // We don't want to decorate non-stdcall or non-fastcall functions right now
111 unsigned CC = F->getCallingConv();
112 if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
115 // Decorate names only when we're targeting Cygwin/Mingw32 targets
116 if (!Subtarget->isTargetCygMing())
119 FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
121 const X86MachineFunctionInfo *Info;
122 if (info_item == FunctionInfoMap.end()) {
123 // Calculate apropriate function info and populate map
124 FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
125 Info = &FunctionInfoMap[F];
127 Info = &info_item->second;
130 const FunctionType *FT = F->getFunctionType();
131 switch (Info->getDecorationStyle()) {
135 // "Pure" variadic functions do not receive @0 suffix.
136 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
137 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
138 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
141 // "Pure" variadic functions do not receive @0 suffix.
142 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
143 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
144 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
146 if (Name[0] == '_') {
153 assert(0 && "Unsupported DecorationStyle");
157 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
158 unsigned FnAlign = MF.getAlignment();
159 const Function *F = MF.getFunction();
161 decorateName(CurrentFnName, F);
163 SwitchToSection(TAI->SectionForGlobal(F));
164 switch (F->getLinkage()) {
165 default: assert(0 && "Unknown linkage type!");
166 case Function::InternalLinkage: // Symbols default to internal.
167 case Function::PrivateLinkage:
168 EmitAlignment(FnAlign, F);
170 case Function::DLLExportLinkage:
171 case Function::ExternalLinkage:
172 EmitAlignment(FnAlign, F);
173 O << "\t.globl\t" << CurrentFnName << '\n';
175 case Function::LinkOnceAnyLinkage:
176 case Function::LinkOnceODRLinkage:
177 case Function::WeakAnyLinkage:
178 case Function::WeakODRLinkage:
179 EmitAlignment(FnAlign, F);
180 if (Subtarget->isTargetDarwin()) {
181 O << "\t.globl\t" << CurrentFnName << '\n';
182 O << TAI->getWeakDefDirective() << CurrentFnName << '\n';
183 } else if (Subtarget->isTargetCygMing()) {
184 O << "\t.globl\t" << CurrentFnName << "\n"
185 "\t.linkonce discard\n";
187 O << "\t.weak\t" << CurrentFnName << '\n';
192 printVisibility(CurrentFnName, F->getVisibility());
194 if (Subtarget->isTargetELF())
195 O << "\t.type\t" << CurrentFnName << ",@function\n";
196 else if (Subtarget->isTargetCygMing()) {
197 O << "\t.def\t " << CurrentFnName
199 (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
200 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
204 O << CurrentFnName << ":\n";
205 // Add some workaround for linkonce linkage on Cygwin\MinGW
206 if (Subtarget->isTargetCygMing() &&
207 (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
208 O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
211 /// runOnMachineFunction - This uses the printMachineInstruction()
212 /// method to print assembly for each instruction.
214 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
215 const Function *F = MF.getFunction();
217 unsigned CC = F->getCallingConv();
219 SetupMachineFunction(MF);
222 // Populate function information map. Actually, We don't want to populate
223 // non-stdcall or non-fastcall functions' information right now.
224 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
225 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
227 // Print out constants referenced by the function
228 EmitConstantPool(MF.getConstantPool());
230 if (F->hasDLLExportLinkage())
231 DLLExportedFns.insert(Mang->makeNameProper(F->getName(), ""));
233 // Print the 'header' of function
234 emitFunctionHeader(MF);
236 // Emit pre-function debug and/or EH information.
237 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
238 DW->BeginFunction(&MF);
240 // Print out code for the function.
241 bool hasAnyRealCode = false;
242 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
244 // Print a label for the basic block.
245 if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
246 // This is an entry block or a block that's only reachable via a
247 // fallthrough edge. In non-VerboseAsm mode, don't print the label.
249 printBasicBlockLabel(I, true, true, VerboseAsm);
252 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
254 // Print the assembly for the instruction.
256 hasAnyRealCode = true;
257 printMachineInstruction(II);
261 if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
262 // If the function is empty, then we need to emit *something*. Otherwise,
263 // the function's label might be associated with something that it wasn't
264 // meant to be associated with. We emit a noop in this situation.
265 // We are assuming inline asms are code.
269 if (TAI->hasDotTypeDotSizeDirective())
270 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
272 // Emit post-function debug information.
273 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
274 DW->EndFunction(&MF);
276 // Print out jump tables referenced by the function.
277 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
281 // We didn't modify anything.
285 static inline bool shouldPrintPLT(TargetMachine &TM, const X86Subtarget* ST) {
286 return ST->isTargetELF() && TM.getRelocationModel() == Reloc::PIC_;
289 static inline bool shouldPrintStub(TargetMachine &TM, const X86Subtarget* ST) {
290 return ST->isPICStyleStub() && TM.getRelocationModel() != Reloc::Static;
293 /// print_pcrel_imm - This is used to print an immediate value that ends up
294 /// being encoded as a pc-relative value. These print slightly differently, for
295 /// example, a $ is not emitted.
296 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
297 const MachineOperand &MO = MI->getOperand(OpNo);
298 switch (MO.getType()) {
299 default: assert(0 && "Unknown pcrel immediate operand");
300 case MachineOperand::MO_Immediate:
303 case MachineOperand::MO_MachineBasicBlock:
304 printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
307 case MachineOperand::MO_GlobalAddress: {
308 const GlobalValue *GV = MO.getGlobal();
309 std::string Name = Mang->getValueName(GV);
310 decorateName(Name, GV);
312 bool needCloseParen = false;
313 if (Name[0] == '$') {
314 // The name begins with a dollar-sign. In order to avoid having it look
315 // like an integer immediate to the assembler, enclose it in parens.
317 needCloseParen = true;
320 if (shouldPrintStub(TM, Subtarget)) {
321 // DARWIN/X86-32 in != static mode.
323 // Link-once, declaration, or Weakly-linked global variables need
324 // non-lazily-resolved stubs
325 if (GV->isDeclaration() || GV->isWeakForLinker()) {
326 // Dynamically-resolved functions need a stub for the function.
327 if (isa<Function>(GV)) {
328 // Function stubs are no longer needed for Mac OS X 10.5 and up.
329 if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
332 FnStubs.insert(Name);
333 printSuffixedName(Name, "$stub");
335 assert(MO.getTargetFlags() == 0);
336 } else if (GV->hasHiddenVisibility()) {
337 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
338 // Definition is not definitely in the current translation unit.
341 HiddenGVStubs.insert(Name);
342 printSuffixedName(Name, "$non_lazy_ptr");
343 assert(MO.getTargetFlags() == 0);
346 GVStubs.insert(Name);
347 printSuffixedName(Name, "$non_lazy_ptr");
348 assert(MO.getTargetFlags() == 0);
354 if (GV->hasDLLImportLinkage()) {
355 assert(MO.getTargetFlags() == 0);
360 if (shouldPrintPLT(TM, Subtarget)) {
361 // Assemble call via PLT for externally visible symbols
362 if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
363 !GV->hasLocalLinkage()) {
365 assert(MO.getTargetFlags() == 0);
368 if (Subtarget->isTargetCygMing() && GV->isDeclaration())
369 // Save function name for later type emission
370 FnStubs.insert(Name);
373 printOffset(MO.getOffset());
380 case MachineOperand::MO_ExternalSymbol: {
381 bool needCloseParen = false;
382 std::string Name(TAI->getGlobalPrefix());
383 Name += MO.getSymbolName();
384 // Print function stub suffix unless it's Mac OS X 10.5 and up.
385 if (shouldPrintStub(TM, Subtarget) &&
386 // DARWIN/X86-32 in != static mode.
387 !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) {
389 FnStubs.insert(Name);
390 printSuffixedName(Name, "$stub");
394 if (Name[0] == '$') {
395 // The name begins with a dollar-sign. In order to avoid having it look
396 // like an integer immediate to the assembler, enclose it in parens.
398 needCloseParen = true;
403 if (MO.getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS) {
405 PrintPICBaseSymbol();
409 if (shouldPrintPLT(TM, Subtarget))
420 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
421 const char *Modifier) {
422 const MachineOperand &MO = MI->getOperand(OpNo);
423 switch (MO.getType()) {
424 default: assert(0 && "unknown operand type!");
425 case MachineOperand::MO_Register: {
426 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
427 "Virtual registers should not make it this far!");
429 unsigned Reg = MO.getReg();
430 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
431 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
432 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
433 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
434 Reg = getX86SubSuperRegister(Reg, VT);
436 O << TRI->getAsmName(Reg);
440 case MachineOperand::MO_Immediate:
441 if (!Modifier || (strcmp(Modifier, "debug") && strcmp(Modifier, "mem")))
445 case MachineOperand::MO_JumpTableIndex: {
446 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
447 if (!isMemOp) O << '$';
448 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
452 case MachineOperand::MO_ConstantPoolIndex: {
453 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
454 if (!isMemOp) O << '$';
455 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
458 printOffset(MO.getOffset());
461 case MachineOperand::MO_GlobalAddress: {
462 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
463 const GlobalValue *GV = MO.getGlobal();
464 std::string Name = Mang->getValueName(GV);
465 decorateName(Name, GV);
467 bool needCloseParen = false;
470 else if (Name[0] == '$') {
471 // The name begins with a dollar-sign. In order to avoid having it look
472 // like an integer immediate to the assembler, enclose it in parens.
474 needCloseParen = true;
477 if (shouldPrintStub(TM, Subtarget)) {
478 // DARWIN/X86-32 in != static mode.
480 // Link-once, declaration, or Weakly-linked global variables need
481 // non-lazily-resolved stubs
482 if (GV->isDeclaration() || GV->isWeakForLinker()) {
483 if (GV->hasHiddenVisibility()) {
484 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
485 // Definition is not definitely in the current translation unit.
488 HiddenGVStubs.insert(Name);
489 printSuffixedName(Name, "$non_lazy_ptr");
490 assert(MO.getTargetFlags() == 0);
493 GVStubs.insert(Name);
494 printSuffixedName(Name, "$non_lazy_ptr");
495 assert(MO.getTargetFlags() == 0);
501 if (TM.getRelocationModel() == Reloc::PIC_) {
503 PrintPICBaseSymbol();
506 if (GV->hasDLLImportLinkage()) {
508 assert(MO.getTargetFlags() == 0);
513 printOffset(MO.getOffset());
520 case MachineOperand::MO_ExternalSymbol:
521 /// NOTE: MO_ExternalSymbol in a non-pcrel_imm context is *only* generated
522 /// by _GLOBAL_OFFSET_TABLE_ on X86-32. All others are call operands, which
524 assert(!Subtarget->is64Bit() && !Subtarget->isPICStyleRIPRel());
525 // These are never used as memory operands.
526 assert(Modifier == 0 || strcmp(Modifier, "mem"));
528 O << TAI->getGlobalPrefix();
529 O << MO.getSymbolName();
533 switch (MO.getTargetFlags()) {
535 assert(0 && "Unknown target flag on GV operand");
536 case X86II::MO_NO_FLAG:
538 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
540 PrintPICBaseSymbol();
543 case X86II::MO_PIC_BASE_OFFSET:
545 PrintPICBaseSymbol();
547 case X86II::MO_TLSGD: O << "@TLSGD"; break;
548 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
549 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
550 case X86II::MO_TPOFF: O << "@TPOFF"; break;
551 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
552 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
553 case X86II::MO_GOT: O << "@GOT"; break;
554 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
558 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
559 unsigned char value = MI->getOperand(Op).getImm();
560 assert(value <= 7 && "Invalid ssecc argument!");
562 case 0: O << "eq"; break;
563 case 1: O << "lt"; break;
564 case 2: O << "le"; break;
565 case 3: O << "unord"; break;
566 case 4: O << "neq"; break;
567 case 5: O << "nlt"; break;
568 case 6: O << "nle"; break;
569 case 7: O << "ord"; break;
573 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
574 const char *Modifier) {
575 const MachineOperand &BaseReg = MI->getOperand(Op);
576 const MachineOperand &IndexReg = MI->getOperand(Op+2);
577 const MachineOperand &DispSpec = MI->getOperand(Op+3);
579 // If we really don't want to print out (rip), don't.
580 bool HasBaseReg = BaseReg.getReg() != 0;
581 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
582 BaseReg.getReg() == X86::RIP)
585 // HasParenPart - True if we will print out the () part of the mem ref.
586 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
588 if (DispSpec.isImm()) {
589 int DispVal = DispSpec.getImm();
590 if (DispVal || !HasParenPart)
593 assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
594 DispSpec.isJTI() || DispSpec.isSymbol());
595 printOperand(MI, Op+3, "mem");
599 assert(IndexReg.getReg() != X86::ESP &&
600 "X86 doesn't allow scaling by ESP");
604 printOperand(MI, Op, Modifier);
606 if (IndexReg.getReg()) {
608 printOperand(MI, Op+2, Modifier);
609 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
611 O << ',' << ScaleVal;
617 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
618 const char *Modifier) {
619 assert(isMem(MI, Op) && "Invalid memory reference!");
620 const MachineOperand &Segment = MI->getOperand(Op+4);
621 if (Segment.getReg()) {
622 printOperand(MI, Op+4, Modifier);
625 printLeaMemReference(MI, Op, Modifier);
628 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
629 const MachineBasicBlock *MBB) const {
630 if (!TAI->getSetDirective())
633 // We don't need .set machinery if we have GOT-style relocations
634 if (Subtarget->isPICStyleGOT())
637 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
638 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
639 printBasicBlockLabel(MBB, false, false, false);
640 if (Subtarget->isPICStyleRIPRel())
641 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
642 << '_' << uid << '\n';
645 PrintPICBaseSymbol();
651 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
652 PrintPICBaseSymbol();
654 PrintPICBaseSymbol();
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");
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': // This is the operand of a call, treat specially.
731 print_pcrel_imm(MI, OpNo);
734 case 'n': { // Negate the immediate or print a '-' before the operand.
735 // Note: this is a temporary solution. It should be handled target
736 // independently as part of the 'MC' work.
737 const MachineOperand &MO = MI->getOperand(OpNo);
747 printOperand(MI, OpNo);
751 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
754 const char *ExtraCode) {
755 if (ExtraCode && ExtraCode[0]) {
756 if (ExtraCode[1] != 0) return true; // Unknown modifier.
758 switch (ExtraCode[0]) {
759 default: return true; // Unknown modifier.
760 case 'b': // Print QImode register
761 case 'h': // Print QImode high register
762 case 'w': // Print HImode register
763 case 'k': // Print SImode register
764 case 'q': // Print SImode register
765 // These only apply to registers, ignore on mem.
767 case 'P': // Don't print @PLT, but do print as memory.
768 printMemReference(MI, OpNo, "no-rip");
772 printMemReference(MI, OpNo);
776 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
777 // Convert registers in the addr mode according to subreg64.
778 for (unsigned i = 0; i != 4; ++i) {
779 if (!MI->getOperand(i).isReg()) continue;
781 unsigned Reg = MI->getOperand(i).getReg();
782 if (Reg == 0) continue;
784 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
788 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
789 /// AT&T syntax to the current output stream.
791 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
795 if (MI->getOpcode() == TargetInstrInfo::INLINEASM) {
799 } else if (MI->isLabel()) {
802 } else if (MI->getOpcode() == TargetInstrInfo::DECLARE) {
805 } else if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
806 printImplicitDef(MI);
813 TmpInst.setOpcode(MI->getOpcode());
815 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
816 const MachineOperand &MO = MI->getOperand(i);
820 MCOp.MakeReg(MO.getReg());
821 } else if (MO.isImm()) {
822 MCOp.MakeImm(MO.getImm());
823 } else if (MO.isMBB()) {
824 MCOp.MakeMBBLabel(getFunctionNumber(), MO.getMBB()->getNumber());
826 assert(0 && "Unimp");
829 TmpInst.addOperand(MCOp);
832 switch (TmpInst.getOpcode()) {
834 // Handle the 'subreg rewriting' for the lea64_32mem operand.
835 lower_lea64_32mem(&TmpInst, 1);
839 // FIXME: Convert TmpInst.
840 printInstruction(&TmpInst);
844 // Call the autogenerated instruction printer routines.
845 printInstruction(MI);
849 bool X86ATTAsmPrinter::doInitialization(Module &M) {
851 Context = new MCContext();
852 // FIXME: Send this to "O" instead of outs(). For now, we force it to
853 // stdout to make it easy to compare.
854 Streamer = createAsmStreamer(*Context, outs());
857 return AsmPrinter::doInitialization(M);
860 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
861 const TargetData *TD = TM.getTargetData();
863 if (!GVar->hasInitializer())
864 return; // External global require no code
866 // Check to see if this is a special global used by LLVM, if so, emit it.
867 if (EmitSpecialLLVMGlobal(GVar)) {
868 if (Subtarget->isTargetDarwin() &&
869 TM.getRelocationModel() == Reloc::Static) {
870 if (GVar->getName() == "llvm.global_ctors")
871 O << ".reference .constructors_used\n";
872 else if (GVar->getName() == "llvm.global_dtors")
873 O << ".reference .destructors_used\n";
878 std::string name = Mang->getValueName(GVar);
879 Constant *C = GVar->getInitializer();
880 if (isa<MDNode>(C) || isa<MDString>(C))
882 const Type *Type = C->getType();
883 unsigned Size = TD->getTypeAllocSize(Type);
884 unsigned Align = TD->getPreferredAlignmentLog(GVar);
886 printVisibility(name, GVar->getVisibility());
888 if (Subtarget->isTargetELF())
889 O << "\t.type\t" << name << ",@object\n";
891 SwitchToSection(TAI->SectionForGlobal(GVar));
893 if (C->isNullValue() && !GVar->hasSection() &&
894 !(Subtarget->isTargetDarwin() &&
895 TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
896 // FIXME: This seems to be pretty darwin-specific
897 if (GVar->hasExternalLinkage()) {
898 if (const char *Directive = TAI->getZeroFillDirective()) {
899 O << "\t.globl " << name << '\n';
900 O << Directive << "__DATA, __common, " << name << ", "
901 << Size << ", " << Align << '\n';
906 if (!GVar->isThreadLocal() &&
907 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
908 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
910 if (TAI->getLCOMMDirective() != NULL) {
911 if (GVar->hasLocalLinkage()) {
912 O << TAI->getLCOMMDirective() << name << ',' << Size;
913 if (Subtarget->isTargetDarwin())
915 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
916 O << "\t.globl " << name << '\n'
917 << TAI->getWeakDefDirective() << name << '\n';
918 EmitAlignment(Align, GVar);
921 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
922 PrintUnmangledNameSafely(GVar, O);
925 EmitGlobalConstant(C);
928 O << TAI->getCOMMDirective() << name << ',' << Size;
929 if (TAI->getCOMMDirectiveTakesAlignment())
930 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
933 if (!Subtarget->isTargetCygMing()) {
934 if (GVar->hasLocalLinkage())
935 O << "\t.local\t" << name << '\n';
937 O << TAI->getCOMMDirective() << name << ',' << Size;
938 if (TAI->getCOMMDirectiveTakesAlignment())
939 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
942 O << "\t\t" << TAI->getCommentString() << ' ';
943 PrintUnmangledNameSafely(GVar, O);
950 switch (GVar->getLinkage()) {
951 case GlobalValue::CommonLinkage:
952 case GlobalValue::LinkOnceAnyLinkage:
953 case GlobalValue::LinkOnceODRLinkage:
954 case GlobalValue::WeakAnyLinkage:
955 case GlobalValue::WeakODRLinkage:
956 if (Subtarget->isTargetDarwin()) {
957 O << "\t.globl " << name << '\n'
958 << TAI->getWeakDefDirective() << name << '\n';
959 } else if (Subtarget->isTargetCygMing()) {
960 O << "\t.globl\t" << name << "\n"
961 "\t.linkonce same_size\n";
963 O << "\t.weak\t" << name << '\n';
966 case GlobalValue::DLLExportLinkage:
967 case GlobalValue::AppendingLinkage:
968 // FIXME: appending linkage variables should go into a section of
969 // their name or something. For now, just emit them as external.
970 case GlobalValue::ExternalLinkage:
971 // If external or appending, declare as a global symbol
972 O << "\t.globl " << name << '\n';
974 case GlobalValue::PrivateLinkage:
975 case GlobalValue::InternalLinkage:
978 assert(0 && "Unknown linkage type!");
981 EmitAlignment(Align, GVar);
984 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
985 PrintUnmangledNameSafely(GVar, O);
988 if (TAI->hasDotTypeDotSizeDirective())
989 O << "\t.size\t" << name << ", " << Size << '\n';
991 EmitGlobalConstant(C);
994 bool X86ATTAsmPrinter::doFinalization(Module &M) {
995 // Print out module-level global variables here.
996 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
998 printModuleLevelGV(I);
1000 if (I->hasDLLExportLinkage())
1001 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
1004 if (Subtarget->isTargetDarwin()) {
1005 SwitchToDataSection("");
1007 // Add the (possibly multiple) personalities to the set of global value
1008 // stubs. Only referenced functions get into the Personalities list.
1009 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
1010 const std::vector<Function*> &Personalities = MMI->getPersonalities();
1011 for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
1012 if (Personalities[i] == 0)
1014 std::string Name = Mang->getValueName(Personalities[i]);
1015 decorateName(Name, Personalities[i]);
1016 GVStubs.insert(Name);
1020 // Output stubs for dynamically-linked functions
1021 if (!FnStubs.empty()) {
1022 for (StringSet<>::iterator I = FnStubs.begin(), E = FnStubs.end();
1024 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
1025 "self_modifying_code+pure_instructions,5", 0);
1026 const char *Name = I->getKeyData();
1027 printSuffixedName(Name, "$stub");
1029 "\t.indirect_symbol " << Name << "\n"
1030 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
1035 // Output stubs for external and common global variables.
1036 if (!GVStubs.empty()) {
1037 SwitchToDataSection(
1038 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1039 for (StringSet<>::iterator I = GVStubs.begin(), E = GVStubs.end();
1041 const char *Name = I->getKeyData();
1042 printSuffixedName(Name, "$non_lazy_ptr");
1043 O << ":\n\t.indirect_symbol " << Name << "\n\t.long\t0\n";
1047 if (!HiddenGVStubs.empty()) {
1048 SwitchToSection(TAI->getDataSection());
1050 for (StringSet<>::iterator I = HiddenGVStubs.begin(),
1051 E = HiddenGVStubs.end(); I != E; ++I) {
1052 const char *Name = I->getKeyData();
1053 printSuffixedName(Name, "$non_lazy_ptr");
1054 O << ":\n" << TAI->getData32bitsDirective() << Name << '\n';
1058 // Funny Darwin hack: This flag tells the linker that no global symbols
1059 // contain code that falls through to other global symbols (e.g. the obvious
1060 // implementation of multiple entry points). If this doesn't occur, the
1061 // linker can safely perform dead code stripping. Since LLVM never
1062 // generates code that does this, it is always safe to set.
1063 O << "\t.subsections_via_symbols\n";
1064 } else if (Subtarget->isTargetCygMing()) {
1065 // Emit type information for external functions
1066 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
1068 O << "\t.def\t " << i->getKeyData()
1069 << ";\t.scl\t" << COFF::C_EXT
1070 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
1076 // Output linker support code for dllexported globals on windows.
1077 if (!DLLExportedGVs.empty()) {
1078 SwitchToDataSection(".section .drectve");
1080 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
1081 e = DLLExportedGVs.end(); i != e; ++i)
1082 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1085 if (!DLLExportedFns.empty()) {
1086 SwitchToDataSection(".section .drectve");
1088 for (StringSet<>::iterator i = DLLExportedFns.begin(),
1089 e = DLLExportedFns.end();
1091 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1094 // Do common shutdown.
1095 bool Changed = AsmPrinter::doFinalization(M);
1097 if (NewAsmPrinter) {
1109 // Include the auto-generated portion of the assembly writer.
1110 #include "X86GenAsmWriter.inc"