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 /// print_pcrel_imm - This is used to print an immediate value that ends up
286 /// being encoded as a pc-relative value. These print slightly differently, for
287 /// example, a $ is not emitted.
288 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
289 const MachineOperand &MO = MI->getOperand(OpNo);
290 switch (MO.getType()) {
291 default: assert(0 && "Unknown pcrel immediate operand");
292 case MachineOperand::MO_Immediate:
295 case MachineOperand::MO_MachineBasicBlock:
296 printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
299 case MachineOperand::MO_GlobalAddress: {
300 const GlobalValue *GV = MO.getGlobal();
301 std::string Name = Mang->getValueName(GV);
302 decorateName(Name, GV);
304 bool needCloseParen = false;
305 if (Name[0] == '$') {
306 // The name begins with a dollar-sign. In order to avoid having it look
307 // like an integer immediate to the assembler, enclose it in parens.
309 needCloseParen = true;
312 if (Subtarget->isPICStyleStub()) {
313 // DARWIN/X86-32 in != static mode.
315 // Link-once, declaration, or Weakly-linked global variables need
316 // non-lazily-resolved stubs
317 if (GV->isDeclaration() || GV->isWeakForLinker()) {
318 // Dynamically-resolved functions need a stub for the function.
319 if (isa<Function>(GV)) {
320 // Function stubs are no longer needed for Mac OS X 10.5 and up.
321 if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
324 FnStubs.insert(Name);
325 printSuffixedName(Name, "$stub");
327 assert(MO.getTargetFlags() == 0);
328 } else if (GV->hasHiddenVisibility()) {
329 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
330 // Definition is not definitely in the current translation unit.
333 HiddenGVStubs.insert(Name);
334 printSuffixedName(Name, "$non_lazy_ptr");
335 assert(MO.getTargetFlags() == 0);
338 GVStubs.insert(Name);
339 printSuffixedName(Name, "$non_lazy_ptr");
340 assert(MO.getTargetFlags() == 0);
346 // Handle dllimport linkage.
347 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
351 // Assemble call via PLT for externally visible symbols.
352 if (MO.getTargetFlags() == X86II::MO_PLT)
355 if (Subtarget->isTargetCygMing() && GV->isDeclaration())
356 // Save function name for later type emission
357 CygMingStubs.insert(Name);
360 printOffset(MO.getOffset());
367 case MachineOperand::MO_ExternalSymbol: {
368 bool needCloseParen = false;
369 std::string Name(TAI->getGlobalPrefix());
370 Name += MO.getSymbolName();
371 // Print function stub suffix unless it's Mac OS X 10.5 and up.
372 if (Subtarget->isPICStyleStub() &&
373 // DARWIN/X86-32 in != static mode.
374 Subtarget->getDarwinVers() < 9) {
375 FnStubs.insert(Name);
376 printSuffixedName(Name, "$stub");
380 if (Name[0] == '$') {
381 // The name begins with a dollar-sign. In order to avoid having it look
382 // like an integer immediate to the assembler, enclose it in parens.
384 needCloseParen = true;
389 if (MO.getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS) {
391 PrintPICBaseSymbol();
395 if (MO.getTargetFlags() == X86II::MO_PLT)
406 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
407 const char *Modifier) {
408 const MachineOperand &MO = MI->getOperand(OpNo);
409 switch (MO.getType()) {
410 default: assert(0 && "unknown operand type!");
411 case MachineOperand::MO_Register: {
412 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
413 "Virtual registers should not make it this far!");
415 unsigned Reg = MO.getReg();
416 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
417 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
418 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
419 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
420 Reg = getX86SubSuperRegister(Reg, VT);
422 O << TRI->getAsmName(Reg);
426 case MachineOperand::MO_Immediate:
427 if (!Modifier || (strcmp(Modifier, "debug") && strcmp(Modifier, "mem")))
431 case MachineOperand::MO_JumpTableIndex: {
432 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
433 if (!isMemOp) O << '$';
434 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
438 case MachineOperand::MO_ConstantPoolIndex: {
439 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
440 if (!isMemOp) O << '$';
441 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
444 printOffset(MO.getOffset());
447 case MachineOperand::MO_GlobalAddress: {
448 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
449 const GlobalValue *GV = MO.getGlobal();
450 std::string Name = Mang->getValueName(GV);
451 decorateName(Name, GV);
453 bool needCloseParen = false;
456 else if (Name[0] == '$') {
457 // The name begins with a dollar-sign. In order to avoid having it look
458 // like an integer immediate to the assembler, enclose it in parens.
460 needCloseParen = true;
463 if (Subtarget->isPICStyleStub()) {
464 // DARWIN/X86-32 in != static mode.
466 // Link-once, declaration, or Weakly-linked global variables need
467 // non-lazily-resolved stubs
468 if (GV->isDeclaration() || GV->isWeakForLinker()) {
469 if (GV->hasHiddenVisibility()) {
470 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
471 // Definition is not definitely in the current translation unit.
474 HiddenGVStubs.insert(Name);
475 printSuffixedName(Name, "$non_lazy_ptr");
476 assert(MO.getTargetFlags() == 0);
479 GVStubs.insert(Name);
480 printSuffixedName(Name, "$non_lazy_ptr");
481 assert(MO.getTargetFlags() == 0);
487 if (TM.getRelocationModel() == Reloc::PIC_) {
489 PrintPICBaseSymbol();
492 // Handle dllimport linkage.
493 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
498 printOffset(MO.getOffset());
505 case MachineOperand::MO_ExternalSymbol:
506 /// NOTE: MO_ExternalSymbol in a non-pcrel_imm context is *only* generated
507 /// by _GLOBAL_OFFSET_TABLE_ on X86-32. All others are call operands, which
509 assert(!Subtarget->is64Bit() && !Subtarget->isPICStyleRIPRel());
510 // These are never used as memory operands.
511 assert(Modifier == 0 || strcmp(Modifier, "mem"));
513 O << TAI->getGlobalPrefix();
514 O << MO.getSymbolName();
518 switch (MO.getTargetFlags()) {
520 assert(0 && "Unknown target flag on GV operand");
521 case X86II::MO_NO_FLAG: // No flag.
522 case X86II::MO_DLLIMPORT: // Prefix, not a suffix.
524 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
526 PrintPICBaseSymbol();
529 case X86II::MO_PIC_BASE_OFFSET:
531 PrintPICBaseSymbol();
533 case X86II::MO_TLSGD: O << "@TLSGD"; break;
534 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
535 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
536 case X86II::MO_TPOFF: O << "@TPOFF"; break;
537 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
538 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
539 case X86II::MO_GOT: O << "@GOT"; break;
540 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
544 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
545 unsigned char value = MI->getOperand(Op).getImm();
546 assert(value <= 7 && "Invalid ssecc argument!");
548 case 0: O << "eq"; break;
549 case 1: O << "lt"; break;
550 case 2: O << "le"; break;
551 case 3: O << "unord"; break;
552 case 4: O << "neq"; break;
553 case 5: O << "nlt"; break;
554 case 6: O << "nle"; break;
555 case 7: O << "ord"; break;
559 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
560 const char *Modifier) {
561 const MachineOperand &BaseReg = MI->getOperand(Op);
562 const MachineOperand &IndexReg = MI->getOperand(Op+2);
563 const MachineOperand &DispSpec = MI->getOperand(Op+3);
565 // If we really don't want to print out (rip), don't.
566 bool HasBaseReg = BaseReg.getReg() != 0;
567 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
568 BaseReg.getReg() == X86::RIP)
571 // HasParenPart - True if we will print out the () part of the mem ref.
572 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
574 if (DispSpec.isImm()) {
575 int DispVal = DispSpec.getImm();
576 if (DispVal || !HasParenPart)
579 assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
580 DispSpec.isJTI() || DispSpec.isSymbol());
581 printOperand(MI, Op+3, "mem");
585 assert(IndexReg.getReg() != X86::ESP &&
586 "X86 doesn't allow scaling by ESP");
590 printOperand(MI, Op, Modifier);
592 if (IndexReg.getReg()) {
594 printOperand(MI, Op+2, Modifier);
595 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
597 O << ',' << ScaleVal;
603 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
604 const char *Modifier) {
605 assert(isMem(MI, Op) && "Invalid memory reference!");
606 const MachineOperand &Segment = MI->getOperand(Op+4);
607 if (Segment.getReg()) {
608 printOperand(MI, Op+4, Modifier);
611 printLeaMemReference(MI, Op, Modifier);
614 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
615 const MachineBasicBlock *MBB) const {
616 if (!TAI->getSetDirective())
619 // We don't need .set machinery if we have GOT-style relocations
620 if (Subtarget->isPICStyleGOT())
623 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
624 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
625 printBasicBlockLabel(MBB, false, false, false);
626 if (Subtarget->isPICStyleRIPRel())
627 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
628 << '_' << uid << '\n';
631 PrintPICBaseSymbol();
637 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
638 PrintPICBaseSymbol();
640 PrintPICBaseSymbol();
645 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
646 const MachineBasicBlock *MBB,
649 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
650 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
652 O << JTEntryDirective << ' ';
654 if (TM.getRelocationModel() == Reloc::PIC_) {
655 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) {
656 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
657 << '_' << uid << "_set_" << MBB->getNumber();
658 } else if (Subtarget->isPICStyleGOT()) {
659 printBasicBlockLabel(MBB, false, false, false);
662 assert(0 && "Don't know how to print MBB label for this PIC mode");
664 printBasicBlockLabel(MBB, false, false, false);
667 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
668 unsigned Reg = MO.getReg();
670 default: return true; // Unknown mode.
671 case 'b': // Print QImode register
672 Reg = getX86SubSuperRegister(Reg, MVT::i8);
674 case 'h': // Print QImode high register
675 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
677 case 'w': // Print HImode register
678 Reg = getX86SubSuperRegister(Reg, MVT::i16);
680 case 'k': // Print SImode register
681 Reg = getX86SubSuperRegister(Reg, MVT::i32);
683 case 'q': // Print DImode register
684 Reg = getX86SubSuperRegister(Reg, MVT::i64);
688 O << '%'<< TRI->getAsmName(Reg);
692 /// PrintAsmOperand - Print out an operand for an inline asm expression.
694 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
696 const char *ExtraCode) {
697 // Does this asm operand have a single letter operand modifier?
698 if (ExtraCode && ExtraCode[0]) {
699 if (ExtraCode[1] != 0) return true; // Unknown modifier.
701 switch (ExtraCode[0]) {
702 default: return true; // Unknown modifier.
703 case 'c': // Don't print "$" before a global var name or constant.
704 printOperand(MI, OpNo, "mem");
706 case 'b': // Print QImode register
707 case 'h': // Print QImode high register
708 case 'w': // Print HImode register
709 case 'k': // Print SImode register
710 case 'q': // Print DImode register
711 if (MI->getOperand(OpNo).isReg())
712 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
713 printOperand(MI, OpNo);
716 case 'P': // This is the operand of a call, treat specially.
717 print_pcrel_imm(MI, OpNo);
720 case 'n': { // Negate the immediate or print a '-' before the operand.
721 // Note: this is a temporary solution. It should be handled target
722 // independently as part of the 'MC' work.
723 const MachineOperand &MO = MI->getOperand(OpNo);
733 printOperand(MI, OpNo);
737 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
740 const char *ExtraCode) {
741 if (ExtraCode && ExtraCode[0]) {
742 if (ExtraCode[1] != 0) return true; // Unknown modifier.
744 switch (ExtraCode[0]) {
745 default: return true; // Unknown modifier.
746 case 'b': // Print QImode register
747 case 'h': // Print QImode high register
748 case 'w': // Print HImode register
749 case 'k': // Print SImode register
750 case 'q': // Print SImode register
751 // These only apply to registers, ignore on mem.
753 case 'P': // Don't print @PLT, but do print as memory.
754 printMemReference(MI, OpNo, "no-rip");
758 printMemReference(MI, OpNo);
762 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
763 // Convert registers in the addr mode according to subreg64.
764 for (unsigned i = 0; i != 4; ++i) {
765 if (!MI->getOperand(i).isReg()) continue;
767 unsigned Reg = MI->getOperand(i).getReg();
768 if (Reg == 0) continue;
770 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
774 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
775 /// AT&T syntax to the current output stream.
777 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
781 if (MI->getOpcode() == TargetInstrInfo::INLINEASM) {
785 } else if (MI->isLabel()) {
788 } else if (MI->getOpcode() == TargetInstrInfo::DECLARE) {
791 } else if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
792 printImplicitDef(MI);
799 TmpInst.setOpcode(MI->getOpcode());
801 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
802 const MachineOperand &MO = MI->getOperand(i);
806 MCOp.MakeReg(MO.getReg());
807 } else if (MO.isImm()) {
808 MCOp.MakeImm(MO.getImm());
809 } else if (MO.isMBB()) {
810 MCOp.MakeMBBLabel(getFunctionNumber(), MO.getMBB()->getNumber());
812 assert(0 && "Unimp");
815 TmpInst.addOperand(MCOp);
818 switch (TmpInst.getOpcode()) {
820 // Handle the 'subreg rewriting' for the lea64_32mem operand.
821 lower_lea64_32mem(&TmpInst, 1);
825 // FIXME: Convert TmpInst.
826 printInstruction(&TmpInst);
830 // Call the autogenerated instruction printer routines.
831 printInstruction(MI);
835 bool X86ATTAsmPrinter::doInitialization(Module &M) {
837 Context = new MCContext();
838 // FIXME: Send this to "O" instead of outs(). For now, we force it to
839 // stdout to make it easy to compare.
840 Streamer = createAsmStreamer(*Context, outs());
843 return AsmPrinter::doInitialization(M);
846 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
847 const TargetData *TD = TM.getTargetData();
849 if (!GVar->hasInitializer())
850 return; // External global require no code
852 // Check to see if this is a special global used by LLVM, if so, emit it.
853 if (EmitSpecialLLVMGlobal(GVar)) {
854 if (Subtarget->isTargetDarwin() &&
855 TM.getRelocationModel() == Reloc::Static) {
856 if (GVar->getName() == "llvm.global_ctors")
857 O << ".reference .constructors_used\n";
858 else if (GVar->getName() == "llvm.global_dtors")
859 O << ".reference .destructors_used\n";
864 std::string name = Mang->getValueName(GVar);
865 Constant *C = GVar->getInitializer();
866 if (isa<MDNode>(C) || isa<MDString>(C))
868 const Type *Type = C->getType();
869 unsigned Size = TD->getTypeAllocSize(Type);
870 unsigned Align = TD->getPreferredAlignmentLog(GVar);
872 printVisibility(name, GVar->getVisibility());
874 if (Subtarget->isTargetELF())
875 O << "\t.type\t" << name << ",@object\n";
877 SwitchToSection(TAI->SectionForGlobal(GVar));
879 if (C->isNullValue() && !GVar->hasSection() &&
880 !(Subtarget->isTargetDarwin() &&
881 TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
882 // FIXME: This seems to be pretty darwin-specific
883 if (GVar->hasExternalLinkage()) {
884 if (const char *Directive = TAI->getZeroFillDirective()) {
885 O << "\t.globl " << name << '\n';
886 O << Directive << "__DATA, __common, " << name << ", "
887 << Size << ", " << Align << '\n';
892 if (!GVar->isThreadLocal() &&
893 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
894 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
896 if (TAI->getLCOMMDirective() != NULL) {
897 if (GVar->hasLocalLinkage()) {
898 O << TAI->getLCOMMDirective() << name << ',' << Size;
899 if (Subtarget->isTargetDarwin())
901 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
902 O << "\t.globl " << name << '\n'
903 << TAI->getWeakDefDirective() << name << '\n';
904 EmitAlignment(Align, GVar);
907 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
908 PrintUnmangledNameSafely(GVar, O);
911 EmitGlobalConstant(C);
914 O << TAI->getCOMMDirective() << name << ',' << Size;
915 if (TAI->getCOMMDirectiveTakesAlignment())
916 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
919 if (!Subtarget->isTargetCygMing()) {
920 if (GVar->hasLocalLinkage())
921 O << "\t.local\t" << name << '\n';
923 O << TAI->getCOMMDirective() << name << ',' << Size;
924 if (TAI->getCOMMDirectiveTakesAlignment())
925 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
928 O << "\t\t" << TAI->getCommentString() << ' ';
929 PrintUnmangledNameSafely(GVar, O);
936 switch (GVar->getLinkage()) {
937 case GlobalValue::CommonLinkage:
938 case GlobalValue::LinkOnceAnyLinkage:
939 case GlobalValue::LinkOnceODRLinkage:
940 case GlobalValue::WeakAnyLinkage:
941 case GlobalValue::WeakODRLinkage:
942 if (Subtarget->isTargetDarwin()) {
943 O << "\t.globl " << name << '\n'
944 << TAI->getWeakDefDirective() << name << '\n';
945 } else if (Subtarget->isTargetCygMing()) {
946 O << "\t.globl\t" << name << "\n"
947 "\t.linkonce same_size\n";
949 O << "\t.weak\t" << name << '\n';
952 case GlobalValue::DLLExportLinkage:
953 case GlobalValue::AppendingLinkage:
954 // FIXME: appending linkage variables should go into a section of
955 // their name or something. For now, just emit them as external.
956 case GlobalValue::ExternalLinkage:
957 // If external or appending, declare as a global symbol
958 O << "\t.globl " << name << '\n';
960 case GlobalValue::PrivateLinkage:
961 case GlobalValue::InternalLinkage:
964 assert(0 && "Unknown linkage type!");
967 EmitAlignment(Align, GVar);
970 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
971 PrintUnmangledNameSafely(GVar, O);
974 if (TAI->hasDotTypeDotSizeDirective())
975 O << "\t.size\t" << name << ", " << Size << '\n';
977 EmitGlobalConstant(C);
980 bool X86ATTAsmPrinter::doFinalization(Module &M) {
981 // Print out module-level global variables here.
982 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
984 printModuleLevelGV(I);
986 if (I->hasDLLExportLinkage())
987 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
990 if (Subtarget->isTargetDarwin()) {
991 SwitchToDataSection("");
993 // Add the (possibly multiple) personalities to the set of global value
994 // stubs. Only referenced functions get into the Personalities list.
995 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
996 const std::vector<Function*> &Personalities = MMI->getPersonalities();
997 for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
998 if (Personalities[i] == 0)
1000 std::string Name = Mang->getValueName(Personalities[i]);
1001 decorateName(Name, Personalities[i]);
1002 GVStubs.insert(Name);
1006 // Output stubs for dynamically-linked functions
1007 if (!FnStubs.empty()) {
1008 for (StringSet<>::iterator I = FnStubs.begin(), E = FnStubs.end();
1010 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
1011 "self_modifying_code+pure_instructions,5", 0);
1012 const char *Name = I->getKeyData();
1013 printSuffixedName(Name, "$stub");
1015 "\t.indirect_symbol " << Name << "\n"
1016 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
1021 // Output stubs for external and common global variables.
1022 if (!GVStubs.empty()) {
1023 SwitchToDataSection(
1024 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1025 for (StringSet<>::iterator I = GVStubs.begin(), E = GVStubs.end();
1027 const char *Name = I->getKeyData();
1028 printSuffixedName(Name, "$non_lazy_ptr");
1029 O << ":\n\t.indirect_symbol " << Name << "\n\t.long\t0\n";
1033 if (!HiddenGVStubs.empty()) {
1034 SwitchToSection(TAI->getDataSection());
1036 for (StringSet<>::iterator I = HiddenGVStubs.begin(),
1037 E = HiddenGVStubs.end(); I != E; ++I) {
1038 const char *Name = I->getKeyData();
1039 printSuffixedName(Name, "$non_lazy_ptr");
1040 O << ":\n" << TAI->getData32bitsDirective() << Name << '\n';
1044 // Funny Darwin hack: This flag tells the linker that no global symbols
1045 // contain code that falls through to other global symbols (e.g. the obvious
1046 // implementation of multiple entry points). If this doesn't occur, the
1047 // linker can safely perform dead code stripping. Since LLVM never
1048 // generates code that does this, it is always safe to set.
1049 O << "\t.subsections_via_symbols\n";
1050 } else if (Subtarget->isTargetCygMing()) {
1051 // Emit type information for external functions
1052 for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
1054 O << "\t.def\t " << i->getKeyData()
1055 << ";\t.scl\t" << COFF::C_EXT
1056 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
1062 // Output linker support code for dllexported globals on windows.
1063 if (!DLLExportedGVs.empty()) {
1064 SwitchToDataSection(".section .drectve");
1066 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
1067 e = DLLExportedGVs.end(); i != e; ++i)
1068 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1071 if (!DLLExportedFns.empty()) {
1072 SwitchToDataSection(".section .drectve");
1074 for (StringSet<>::iterator i = DLLExportedFns.begin(),
1075 e = DLLExportedFns.end();
1077 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1080 // Do common shutdown.
1081 bool Changed = AsmPrinter::doFinalization(M);
1083 if (NewAsmPrinter) {
1095 // Include the auto-generated portion of the assembly writer.
1096 #include "X86GenAsmWriter.inc"