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 /// print_pcrel_imm - This is used to print an immediate value that ends up
290 /// being encoded as a pc-relative value. These print slightly differently, for
291 /// example, a $ is not emitted.
292 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
293 const MachineOperand &MO = MI->getOperand(OpNo);
294 switch (MO.getType()) {
295 default: assert(0 && "Unknown pcrel immediate operand");
296 case MachineOperand::MO_Immediate:
299 case MachineOperand::MO_MachineBasicBlock:
300 printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
303 case MachineOperand::MO_GlobalAddress: {
304 const GlobalValue *GV = MO.getGlobal();
305 std::string Name = Mang->getValueName(GV);
306 decorateName(Name, GV);
308 bool needCloseParen = false;
309 if (Name[0] == '$') {
310 // The name begins with a dollar-sign. In order to avoid having it look
311 // like an integer immediate to the assembler, enclose it in parens.
313 needCloseParen = true;
316 if (Subtarget->isPICStyleStub()) {
317 // DARWIN/X86-32 in != static mode.
319 // Link-once, declaration, or Weakly-linked global variables need
320 // non-lazily-resolved stubs
321 if (GV->isDeclaration() || GV->isWeakForLinker()) {
322 // Dynamically-resolved functions need a stub for the function.
323 if (isa<Function>(GV)) {
324 // Function stubs are no longer needed for Mac OS X 10.5 and up.
325 if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
328 FnStubs.insert(Name);
329 printSuffixedName(Name, "$stub");
331 assert(MO.getTargetFlags() == 0);
332 } else if (GV->hasHiddenVisibility()) {
333 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
334 // Definition is not definitely in the current translation unit.
337 HiddenGVStubs.insert(Name);
338 printSuffixedName(Name, "$non_lazy_ptr");
339 assert(MO.getTargetFlags() == 0);
342 GVStubs.insert(Name);
343 printSuffixedName(Name, "$non_lazy_ptr");
344 assert(MO.getTargetFlags() == 0);
350 // Handle dllimport linkage.
351 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
355 if (shouldPrintPLT(TM, Subtarget)) {
356 // Assemble call via PLT for externally visible symbols
357 if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
358 !GV->hasLocalLinkage()) {
360 assert(MO.getTargetFlags() == 0);
363 if (Subtarget->isTargetCygMing() && GV->isDeclaration())
364 // Save function name for later type emission
365 FnStubs.insert(Name);
368 printOffset(MO.getOffset());
375 case MachineOperand::MO_ExternalSymbol: {
376 bool needCloseParen = false;
377 std::string Name(TAI->getGlobalPrefix());
378 Name += MO.getSymbolName();
379 // Print function stub suffix unless it's Mac OS X 10.5 and up.
380 if (Subtarget->isPICStyleStub() &&
381 // DARWIN/X86-32 in != static mode.
382 Subtarget->getDarwinVers() < 9) {
383 FnStubs.insert(Name);
384 printSuffixedName(Name, "$stub");
388 if (Name[0] == '$') {
389 // The name begins with a dollar-sign. In order to avoid having it look
390 // like an integer immediate to the assembler, enclose it in parens.
392 needCloseParen = true;
397 if (MO.getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS) {
399 PrintPICBaseSymbol();
403 if (shouldPrintPLT(TM, Subtarget)) {
405 assert(MO.getTargetFlags() == 0);
416 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
417 const char *Modifier) {
418 const MachineOperand &MO = MI->getOperand(OpNo);
419 switch (MO.getType()) {
420 default: assert(0 && "unknown operand type!");
421 case MachineOperand::MO_Register: {
422 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
423 "Virtual registers should not make it this far!");
425 unsigned Reg = MO.getReg();
426 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
427 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
428 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
429 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
430 Reg = getX86SubSuperRegister(Reg, VT);
432 O << TRI->getAsmName(Reg);
436 case MachineOperand::MO_Immediate:
437 if (!Modifier || (strcmp(Modifier, "debug") && strcmp(Modifier, "mem")))
441 case MachineOperand::MO_JumpTableIndex: {
442 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
443 if (!isMemOp) O << '$';
444 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
448 case MachineOperand::MO_ConstantPoolIndex: {
449 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
450 if (!isMemOp) O << '$';
451 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
454 printOffset(MO.getOffset());
457 case MachineOperand::MO_GlobalAddress: {
458 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
459 const GlobalValue *GV = MO.getGlobal();
460 std::string Name = Mang->getValueName(GV);
461 decorateName(Name, GV);
463 bool needCloseParen = false;
466 else if (Name[0] == '$') {
467 // The name begins with a dollar-sign. In order to avoid having it look
468 // like an integer immediate to the assembler, enclose it in parens.
470 needCloseParen = true;
473 if (Subtarget->isPICStyleStub()) {
474 // DARWIN/X86-32 in != static mode.
476 // Link-once, declaration, or Weakly-linked global variables need
477 // non-lazily-resolved stubs
478 if (GV->isDeclaration() || GV->isWeakForLinker()) {
479 if (GV->hasHiddenVisibility()) {
480 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
481 // Definition is not definitely in the current translation unit.
484 HiddenGVStubs.insert(Name);
485 printSuffixedName(Name, "$non_lazy_ptr");
486 assert(MO.getTargetFlags() == 0);
489 GVStubs.insert(Name);
490 printSuffixedName(Name, "$non_lazy_ptr");
491 assert(MO.getTargetFlags() == 0);
497 if (TM.getRelocationModel() == Reloc::PIC_) {
499 PrintPICBaseSymbol();
502 // Handle dllimport linkage.
503 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
508 printOffset(MO.getOffset());
515 case MachineOperand::MO_ExternalSymbol:
516 /// NOTE: MO_ExternalSymbol in a non-pcrel_imm context is *only* generated
517 /// by _GLOBAL_OFFSET_TABLE_ on X86-32. All others are call operands, which
519 assert(!Subtarget->is64Bit() && !Subtarget->isPICStyleRIPRel());
520 // These are never used as memory operands.
521 assert(Modifier == 0 || strcmp(Modifier, "mem"));
523 O << TAI->getGlobalPrefix();
524 O << MO.getSymbolName();
528 switch (MO.getTargetFlags()) {
530 assert(0 && "Unknown target flag on GV operand");
531 case X86II::MO_NO_FLAG: // No flag.
532 case X86II::MO_DLLIMPORT: // Prefix, not a suffix.
534 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
536 PrintPICBaseSymbol();
539 case X86II::MO_PIC_BASE_OFFSET:
541 PrintPICBaseSymbol();
543 case X86II::MO_TLSGD: O << "@TLSGD"; break;
544 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
545 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
546 case X86II::MO_TPOFF: O << "@TPOFF"; break;
547 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
548 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
549 case X86II::MO_GOT: O << "@GOT"; break;
550 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
554 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
555 unsigned char value = MI->getOperand(Op).getImm();
556 assert(value <= 7 && "Invalid ssecc argument!");
558 case 0: O << "eq"; break;
559 case 1: O << "lt"; break;
560 case 2: O << "le"; break;
561 case 3: O << "unord"; break;
562 case 4: O << "neq"; break;
563 case 5: O << "nlt"; break;
564 case 6: O << "nle"; break;
565 case 7: O << "ord"; break;
569 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
570 const char *Modifier) {
571 const MachineOperand &BaseReg = MI->getOperand(Op);
572 const MachineOperand &IndexReg = MI->getOperand(Op+2);
573 const MachineOperand &DispSpec = MI->getOperand(Op+3);
575 // If we really don't want to print out (rip), don't.
576 bool HasBaseReg = BaseReg.getReg() != 0;
577 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
578 BaseReg.getReg() == X86::RIP)
581 // HasParenPart - True if we will print out the () part of the mem ref.
582 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
584 if (DispSpec.isImm()) {
585 int DispVal = DispSpec.getImm();
586 if (DispVal || !HasParenPart)
589 assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
590 DispSpec.isJTI() || DispSpec.isSymbol());
591 printOperand(MI, Op+3, "mem");
595 assert(IndexReg.getReg() != X86::ESP &&
596 "X86 doesn't allow scaling by ESP");
600 printOperand(MI, Op, Modifier);
602 if (IndexReg.getReg()) {
604 printOperand(MI, Op+2, Modifier);
605 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
607 O << ',' << ScaleVal;
613 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
614 const char *Modifier) {
615 assert(isMem(MI, Op) && "Invalid memory reference!");
616 const MachineOperand &Segment = MI->getOperand(Op+4);
617 if (Segment.getReg()) {
618 printOperand(MI, Op+4, Modifier);
621 printLeaMemReference(MI, Op, Modifier);
624 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
625 const MachineBasicBlock *MBB) const {
626 if (!TAI->getSetDirective())
629 // We don't need .set machinery if we have GOT-style relocations
630 if (Subtarget->isPICStyleGOT())
633 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
634 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
635 printBasicBlockLabel(MBB, false, false, false);
636 if (Subtarget->isPICStyleRIPRel())
637 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
638 << '_' << uid << '\n';
641 PrintPICBaseSymbol();
647 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
648 PrintPICBaseSymbol();
650 PrintPICBaseSymbol();
655 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
656 const MachineBasicBlock *MBB,
659 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
660 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
662 O << JTEntryDirective << ' ';
664 if (TM.getRelocationModel() == Reloc::PIC_) {
665 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) {
666 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
667 << '_' << uid << "_set_" << MBB->getNumber();
668 } else if (Subtarget->isPICStyleGOT()) {
669 printBasicBlockLabel(MBB, false, false, false);
672 assert(0 && "Don't know how to print MBB label for this PIC mode");
674 printBasicBlockLabel(MBB, false, false, false);
677 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
678 unsigned Reg = MO.getReg();
680 default: return true; // Unknown mode.
681 case 'b': // Print QImode register
682 Reg = getX86SubSuperRegister(Reg, MVT::i8);
684 case 'h': // Print QImode high register
685 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
687 case 'w': // Print HImode register
688 Reg = getX86SubSuperRegister(Reg, MVT::i16);
690 case 'k': // Print SImode register
691 Reg = getX86SubSuperRegister(Reg, MVT::i32);
693 case 'q': // Print DImode register
694 Reg = getX86SubSuperRegister(Reg, MVT::i64);
698 O << '%'<< TRI->getAsmName(Reg);
702 /// PrintAsmOperand - Print out an operand for an inline asm expression.
704 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
706 const char *ExtraCode) {
707 // Does this asm operand have a single letter operand modifier?
708 if (ExtraCode && ExtraCode[0]) {
709 if (ExtraCode[1] != 0) return true; // Unknown modifier.
711 switch (ExtraCode[0]) {
712 default: return true; // Unknown modifier.
713 case 'c': // Don't print "$" before a global var name or constant.
714 printOperand(MI, OpNo, "mem");
716 case 'b': // Print QImode register
717 case 'h': // Print QImode high register
718 case 'w': // Print HImode register
719 case 'k': // Print SImode register
720 case 'q': // Print DImode register
721 if (MI->getOperand(OpNo).isReg())
722 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
723 printOperand(MI, OpNo);
726 case 'P': // This is the operand of a call, treat specially.
727 print_pcrel_imm(MI, OpNo);
730 case 'n': { // Negate the immediate or print a '-' before the operand.
731 // Note: this is a temporary solution. It should be handled target
732 // independently as part of the 'MC' work.
733 const MachineOperand &MO = MI->getOperand(OpNo);
743 printOperand(MI, OpNo);
747 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
750 const char *ExtraCode) {
751 if (ExtraCode && ExtraCode[0]) {
752 if (ExtraCode[1] != 0) return true; // Unknown modifier.
754 switch (ExtraCode[0]) {
755 default: return true; // Unknown modifier.
756 case 'b': // Print QImode register
757 case 'h': // Print QImode high register
758 case 'w': // Print HImode register
759 case 'k': // Print SImode register
760 case 'q': // Print SImode register
761 // These only apply to registers, ignore on mem.
763 case 'P': // Don't print @PLT, but do print as memory.
764 printMemReference(MI, OpNo, "no-rip");
768 printMemReference(MI, OpNo);
772 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
773 // Convert registers in the addr mode according to subreg64.
774 for (unsigned i = 0; i != 4; ++i) {
775 if (!MI->getOperand(i).isReg()) continue;
777 unsigned Reg = MI->getOperand(i).getReg();
778 if (Reg == 0) continue;
780 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
784 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
785 /// AT&T syntax to the current output stream.
787 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
791 if (MI->getOpcode() == TargetInstrInfo::INLINEASM) {
795 } else if (MI->isLabel()) {
798 } else if (MI->getOpcode() == TargetInstrInfo::DECLARE) {
801 } else if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
802 printImplicitDef(MI);
809 TmpInst.setOpcode(MI->getOpcode());
811 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
812 const MachineOperand &MO = MI->getOperand(i);
816 MCOp.MakeReg(MO.getReg());
817 } else if (MO.isImm()) {
818 MCOp.MakeImm(MO.getImm());
819 } else if (MO.isMBB()) {
820 MCOp.MakeMBBLabel(getFunctionNumber(), MO.getMBB()->getNumber());
822 assert(0 && "Unimp");
825 TmpInst.addOperand(MCOp);
828 switch (TmpInst.getOpcode()) {
830 // Handle the 'subreg rewriting' for the lea64_32mem operand.
831 lower_lea64_32mem(&TmpInst, 1);
835 // FIXME: Convert TmpInst.
836 printInstruction(&TmpInst);
840 // Call the autogenerated instruction printer routines.
841 printInstruction(MI);
845 bool X86ATTAsmPrinter::doInitialization(Module &M) {
847 Context = new MCContext();
848 // FIXME: Send this to "O" instead of outs(). For now, we force it to
849 // stdout to make it easy to compare.
850 Streamer = createAsmStreamer(*Context, outs());
853 return AsmPrinter::doInitialization(M);
856 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
857 const TargetData *TD = TM.getTargetData();
859 if (!GVar->hasInitializer())
860 return; // External global require no code
862 // Check to see if this is a special global used by LLVM, if so, emit it.
863 if (EmitSpecialLLVMGlobal(GVar)) {
864 if (Subtarget->isTargetDarwin() &&
865 TM.getRelocationModel() == Reloc::Static) {
866 if (GVar->getName() == "llvm.global_ctors")
867 O << ".reference .constructors_used\n";
868 else if (GVar->getName() == "llvm.global_dtors")
869 O << ".reference .destructors_used\n";
874 std::string name = Mang->getValueName(GVar);
875 Constant *C = GVar->getInitializer();
876 if (isa<MDNode>(C) || isa<MDString>(C))
878 const Type *Type = C->getType();
879 unsigned Size = TD->getTypeAllocSize(Type);
880 unsigned Align = TD->getPreferredAlignmentLog(GVar);
882 printVisibility(name, GVar->getVisibility());
884 if (Subtarget->isTargetELF())
885 O << "\t.type\t" << name << ",@object\n";
887 SwitchToSection(TAI->SectionForGlobal(GVar));
889 if (C->isNullValue() && !GVar->hasSection() &&
890 !(Subtarget->isTargetDarwin() &&
891 TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
892 // FIXME: This seems to be pretty darwin-specific
893 if (GVar->hasExternalLinkage()) {
894 if (const char *Directive = TAI->getZeroFillDirective()) {
895 O << "\t.globl " << name << '\n';
896 O << Directive << "__DATA, __common, " << name << ", "
897 << Size << ", " << Align << '\n';
902 if (!GVar->isThreadLocal() &&
903 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
904 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
906 if (TAI->getLCOMMDirective() != NULL) {
907 if (GVar->hasLocalLinkage()) {
908 O << TAI->getLCOMMDirective() << name << ',' << Size;
909 if (Subtarget->isTargetDarwin())
911 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
912 O << "\t.globl " << name << '\n'
913 << TAI->getWeakDefDirective() << name << '\n';
914 EmitAlignment(Align, GVar);
917 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
918 PrintUnmangledNameSafely(GVar, O);
921 EmitGlobalConstant(C);
924 O << TAI->getCOMMDirective() << name << ',' << Size;
925 if (TAI->getCOMMDirectiveTakesAlignment())
926 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
929 if (!Subtarget->isTargetCygMing()) {
930 if (GVar->hasLocalLinkage())
931 O << "\t.local\t" << name << '\n';
933 O << TAI->getCOMMDirective() << name << ',' << Size;
934 if (TAI->getCOMMDirectiveTakesAlignment())
935 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
938 O << "\t\t" << TAI->getCommentString() << ' ';
939 PrintUnmangledNameSafely(GVar, O);
946 switch (GVar->getLinkage()) {
947 case GlobalValue::CommonLinkage:
948 case GlobalValue::LinkOnceAnyLinkage:
949 case GlobalValue::LinkOnceODRLinkage:
950 case GlobalValue::WeakAnyLinkage:
951 case GlobalValue::WeakODRLinkage:
952 if (Subtarget->isTargetDarwin()) {
953 O << "\t.globl " << name << '\n'
954 << TAI->getWeakDefDirective() << name << '\n';
955 } else if (Subtarget->isTargetCygMing()) {
956 O << "\t.globl\t" << name << "\n"
957 "\t.linkonce same_size\n";
959 O << "\t.weak\t" << name << '\n';
962 case GlobalValue::DLLExportLinkage:
963 case GlobalValue::AppendingLinkage:
964 // FIXME: appending linkage variables should go into a section of
965 // their name or something. For now, just emit them as external.
966 case GlobalValue::ExternalLinkage:
967 // If external or appending, declare as a global symbol
968 O << "\t.globl " << name << '\n';
970 case GlobalValue::PrivateLinkage:
971 case GlobalValue::InternalLinkage:
974 assert(0 && "Unknown linkage type!");
977 EmitAlignment(Align, GVar);
980 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
981 PrintUnmangledNameSafely(GVar, O);
984 if (TAI->hasDotTypeDotSizeDirective())
985 O << "\t.size\t" << name << ", " << Size << '\n';
987 EmitGlobalConstant(C);
990 bool X86ATTAsmPrinter::doFinalization(Module &M) {
991 // Print out module-level global variables here.
992 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
994 printModuleLevelGV(I);
996 if (I->hasDLLExportLinkage())
997 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
1000 if (Subtarget->isTargetDarwin()) {
1001 SwitchToDataSection("");
1003 // Add the (possibly multiple) personalities to the set of global value
1004 // stubs. Only referenced functions get into the Personalities list.
1005 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
1006 const std::vector<Function*> &Personalities = MMI->getPersonalities();
1007 for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
1008 if (Personalities[i] == 0)
1010 std::string Name = Mang->getValueName(Personalities[i]);
1011 decorateName(Name, Personalities[i]);
1012 GVStubs.insert(Name);
1016 // Output stubs for dynamically-linked functions
1017 if (!FnStubs.empty()) {
1018 for (StringSet<>::iterator I = FnStubs.begin(), E = FnStubs.end();
1020 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
1021 "self_modifying_code+pure_instructions,5", 0);
1022 const char *Name = I->getKeyData();
1023 printSuffixedName(Name, "$stub");
1025 "\t.indirect_symbol " << Name << "\n"
1026 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
1031 // Output stubs for external and common global variables.
1032 if (!GVStubs.empty()) {
1033 SwitchToDataSection(
1034 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1035 for (StringSet<>::iterator I = GVStubs.begin(), E = GVStubs.end();
1037 const char *Name = I->getKeyData();
1038 printSuffixedName(Name, "$non_lazy_ptr");
1039 O << ":\n\t.indirect_symbol " << Name << "\n\t.long\t0\n";
1043 if (!HiddenGVStubs.empty()) {
1044 SwitchToSection(TAI->getDataSection());
1046 for (StringSet<>::iterator I = HiddenGVStubs.begin(),
1047 E = HiddenGVStubs.end(); I != E; ++I) {
1048 const char *Name = I->getKeyData();
1049 printSuffixedName(Name, "$non_lazy_ptr");
1050 O << ":\n" << TAI->getData32bitsDirective() << Name << '\n';
1054 // Funny Darwin hack: This flag tells the linker that no global symbols
1055 // contain code that falls through to other global symbols (e.g. the obvious
1056 // implementation of multiple entry points). If this doesn't occur, the
1057 // linker can safely perform dead code stripping. Since LLVM never
1058 // generates code that does this, it is always safe to set.
1059 O << "\t.subsections_via_symbols\n";
1060 } else if (Subtarget->isTargetCygMing()) {
1061 // Emit type information for external functions
1062 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
1064 O << "\t.def\t " << i->getKeyData()
1065 << ";\t.scl\t" << COFF::C_EXT
1066 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
1072 // Output linker support code for dllexported globals on windows.
1073 if (!DLLExportedGVs.empty()) {
1074 SwitchToDataSection(".section .drectve");
1076 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
1077 e = DLLExportedGVs.end(); i != e; ++i)
1078 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1081 if (!DLLExportedFns.empty()) {
1082 SwitchToDataSection(".section .drectve");
1084 for (StringSet<>::iterator i = DLLExportedFns.begin(),
1085 e = DLLExportedFns.end();
1087 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1090 // Do common shutdown.
1091 bool Changed = AsmPrinter::doFinalization(M);
1093 if (NewAsmPrinter) {
1105 // Include the auto-generated portion of the assembly writer.
1106 #include "X86GenAsmWriter.inc"