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");
159 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
160 const Function *F = MF.getFunction();
162 decorateName(CurrentFnName, F);
164 SwitchToSection(TAI->SectionForGlobal(F));
166 // FIXME: A function's alignment should be part of MachineFunction. There
167 // shouldn't be a policy decision here.
168 unsigned FnAlign = 4;
169 if (F->hasFnAttr(Attribute::OptimizeForSize))
172 switch (F->getLinkage()) {
173 default: assert(0 && "Unknown linkage type!");
174 case Function::InternalLinkage: // Symbols default to internal.
175 case Function::PrivateLinkage:
176 EmitAlignment(FnAlign, F);
178 case Function::DLLExportLinkage:
179 case Function::ExternalLinkage:
180 EmitAlignment(FnAlign, F);
181 O << "\t.globl\t" << CurrentFnName << '\n';
183 case Function::LinkOnceAnyLinkage:
184 case Function::LinkOnceODRLinkage:
185 case Function::WeakAnyLinkage:
186 case Function::WeakODRLinkage:
187 EmitAlignment(FnAlign, F);
188 if (Subtarget->isTargetDarwin()) {
189 O << "\t.globl\t" << CurrentFnName << '\n';
190 O << TAI->getWeakDefDirective() << CurrentFnName << '\n';
191 } else if (Subtarget->isTargetCygMing()) {
192 O << "\t.globl\t" << CurrentFnName << "\n"
193 "\t.linkonce discard\n";
195 O << "\t.weak\t" << CurrentFnName << '\n';
200 printVisibility(CurrentFnName, F->getVisibility());
202 if (Subtarget->isTargetELF())
203 O << "\t.type\t" << CurrentFnName << ",@function\n";
204 else if (Subtarget->isTargetCygMing()) {
205 O << "\t.def\t " << CurrentFnName
207 (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
208 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
212 O << CurrentFnName << ":\n";
213 // Add some workaround for linkonce linkage on Cygwin\MinGW
214 if (Subtarget->isTargetCygMing() &&
215 (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
216 O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
219 /// runOnMachineFunction - This uses the printMachineInstruction()
220 /// method to print assembly for each instruction.
222 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
223 const Function *F = MF.getFunction();
225 unsigned CC = F->getCallingConv();
227 SetupMachineFunction(MF);
230 // Populate function information map. Actually, We don't want to populate
231 // non-stdcall or non-fastcall functions' information right now.
232 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
233 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
235 // Print out constants referenced by the function
236 EmitConstantPool(MF.getConstantPool());
238 if (F->hasDLLExportLinkage())
239 DLLExportedFns.insert(Mang->makeNameProper(F->getName(), ""));
241 // Print the 'header' of function
242 emitFunctionHeader(MF);
244 // Emit pre-function debug and/or EH information.
245 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
246 DW->BeginFunction(&MF);
248 // Print out code for the function.
249 bool hasAnyRealCode = false;
250 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
252 // Print a label for the basic block.
253 if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
254 // This is an entry block or a block that's only reachable via a
255 // fallthrough edge. In non-VerboseAsm mode, don't print the label.
257 printBasicBlockLabel(I, true, true, VerboseAsm);
260 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
262 // Print the assembly for the instruction.
264 hasAnyRealCode = true;
265 printMachineInstruction(II);
269 if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
270 // If the function is empty, then we need to emit *something*. Otherwise,
271 // the function's label might be associated with something that it wasn't
272 // meant to be associated with. We emit a noop in this situation.
273 // We are assuming inline asms are code.
277 if (TAI->hasDotTypeDotSizeDirective())
278 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
280 // Emit post-function debug information.
281 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
282 DW->EndFunction(&MF);
284 // Print out jump tables referenced by the function.
285 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
289 // We didn't modify anything.
293 static inline bool shouldPrintGOT(TargetMachine &TM, const X86Subtarget* ST) {
294 return ST->isPICStyleGOT() && TM.getRelocationModel() == Reloc::PIC_;
297 static inline bool shouldPrintPLT(TargetMachine &TM, const X86Subtarget* ST) {
298 return ST->isTargetELF() && TM.getRelocationModel() == Reloc::PIC_;
301 static inline bool shouldPrintStub(TargetMachine &TM, const X86Subtarget* ST) {
302 return ST->isPICStyleStub() && TM.getRelocationModel() != Reloc::Static;
305 /// print_pcrel_imm - This is used to print an immediate value that ends up
306 /// being encoded as a pc-relative value. These print slightly differently, for
307 /// example, a $ is not emitted.
308 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
309 const MachineOperand &MO = MI->getOperand(OpNo);
310 switch (MO.getType()) {
311 default: assert(0 && "Unknown pcrel immediate operand");
312 case MachineOperand::MO_Immediate:
315 case MachineOperand::MO_MachineBasicBlock:
316 printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
319 case MachineOperand::MO_GlobalAddress: {
320 const GlobalValue *GV = MO.getGlobal();
321 std::string Name = Mang->getValueName(GV);
322 decorateName(Name, GV);
324 bool needCloseParen = false;
325 if (Name[0] == '$') {
326 // The name begins with a dollar-sign. In order to avoid having it look
327 // like an integer immediate to the assembler, enclose it in parens.
329 needCloseParen = true;
332 if (shouldPrintStub(TM, Subtarget)) {
333 // DARWIN/X86-32 in != static mode.
335 // Link-once, declaration, or Weakly-linked global variables need
336 // non-lazily-resolved stubs
337 if (GV->isDeclaration() || GV->isWeakForLinker()) {
338 // Dynamically-resolved functions need a stub for the function.
339 if (isa<Function>(GV)) {
340 // Function stubs are no longer needed for Mac OS X 10.5 and up.
341 if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
344 FnStubs.insert(Name);
345 printSuffixedName(Name, "$stub");
347 } else if (GV->hasHiddenVisibility()) {
348 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
349 // Definition is not definitely in the current translation unit.
352 HiddenGVStubs.insert(Name);
353 printSuffixedName(Name, "$non_lazy_ptr");
356 GVStubs.insert(Name);
357 printSuffixedName(Name, "$non_lazy_ptr");
360 if (GV->hasDLLImportLinkage())
365 if (GV->hasDLLImportLinkage())
369 if (shouldPrintPLT(TM, Subtarget)) {
370 // Assemble call via PLT for externally visible symbols
371 if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
372 !GV->hasLocalLinkage())
375 if (Subtarget->isTargetCygMing() && GV->isDeclaration())
376 // Save function name for later type emission
377 FnStubs.insert(Name);
380 printOffset(MO.getOffset());
387 case MachineOperand::MO_ExternalSymbol: {
388 bool needCloseParen = false;
389 std::string Name(TAI->getGlobalPrefix());
390 Name += MO.getSymbolName();
391 // Print function stub suffix unless it's Mac OS X 10.5 and up.
392 if (shouldPrintStub(TM, Subtarget) &&
393 // DARWIN/X86-32 in != static mode.
394 !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) {
396 FnStubs.insert(Name);
397 printSuffixedName(Name, "$stub");
401 if (Name[0] == '$') {
402 // The name begins with a dollar-sign. In order to avoid having it look
403 // like an integer immediate to the assembler, enclose it in parens.
405 needCloseParen = true;
410 if (MO.getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS) {
412 PrintPICBaseSymbol();
416 if (shouldPrintPLT(TM, Subtarget))
427 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
428 const char *Modifier, bool NotRIPRel) {
429 const MachineOperand &MO = MI->getOperand(OpNo);
430 switch (MO.getType()) {
431 case MachineOperand::MO_Register: {
432 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
433 "Virtual registers should not make it this far!");
435 unsigned Reg = MO.getReg();
436 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
437 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
438 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
439 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
440 Reg = getX86SubSuperRegister(Reg, VT);
442 O << TRI->getAsmName(Reg);
446 case MachineOperand::MO_Immediate:
447 if (!Modifier || (strcmp(Modifier, "debug") &&
448 strcmp(Modifier, "mem")))
452 case MachineOperand::MO_JumpTableIndex: {
453 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
454 if (!isMemOp) O << '$';
455 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
458 switch (MO.getTargetFlags()) {
460 assert(0 && "Unknown target flag on jump table operand");
461 case X86II::MO_NO_FLAG:
462 // FIXME: REMOVE EVENTUALLY.
463 if (TM.getRelocationModel() == Reloc::PIC_) {
464 assert(!Subtarget->isPICStyleStub() &&
465 !Subtarget->isPICStyleGOT() &&
466 "Should have operand flag!");
470 case X86II::MO_PIC_BASE_OFFSET:
472 PrintPICBaseSymbol();
474 case X86II::MO_GOTOFF:
479 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
483 case MachineOperand::MO_ConstantPoolIndex: {
484 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
485 if (!isMemOp) O << '$';
486 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
489 printOffset(MO.getOffset());
491 switch (MO.getTargetFlags()) {
493 assert(0 && "Unknown target flag on constant pool operand");
494 case X86II::MO_NO_FLAG:
495 // FIXME: REMOVE EVENTUALLY.
496 if (TM.getRelocationModel() == Reloc::PIC_) {
497 assert(!Subtarget->isPICStyleStub() &&
498 !Subtarget->isPICStyleGOT() &&
499 "Should have operand flag!");
503 case X86II::MO_PIC_BASE_OFFSET:
505 PrintPICBaseSymbol();
507 case X86II::MO_GOTOFF:
512 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
516 case MachineOperand::MO_GlobalAddress: {
517 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
518 bool needCloseParen = false;
520 const GlobalValue *GV = MO.getGlobal();
521 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
523 // If GV is an alias then use the aliasee for determining
525 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
526 GVar =dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
529 bool isThreadLocal = GVar && GVar->isThreadLocal();
531 std::string Name = Mang->getValueName(GV);
532 decorateName(Name, GV);
536 else if (Name[0] == '$') {
537 // The name begins with a dollar-sign. In order to avoid having it look
538 // like an integer immediate to the assembler, enclose it in parens.
540 needCloseParen = true;
543 if (shouldPrintStub(TM, Subtarget)) {
544 // DARWIN/X86-32 in != static mode.
546 // Link-once, declaration, or Weakly-linked global variables need
547 // non-lazily-resolved stubs
548 if (GV->isDeclaration() || GV->isWeakForLinker()) {
549 // Dynamically-resolved functions need a stub for the function.
550 if (GV->hasHiddenVisibility()) {
551 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
552 // Definition is not definitely in the current translation unit.
555 HiddenGVStubs.insert(Name);
556 printSuffixedName(Name, "$non_lazy_ptr");
559 GVStubs.insert(Name);
560 printSuffixedName(Name, "$non_lazy_ptr");
563 if (GV->hasDLLImportLinkage())
568 if (TM.getRelocationModel() == Reloc::PIC_) {
570 PrintPICBaseSymbol();
573 if (GV->hasDLLImportLinkage())
578 printOffset(MO.getOffset());
583 bool isRIPRelative = false;
585 switch (MO.getTargetFlags()) {
587 assert(0 && "Unknown target flag on GV operand");
588 case X86II::MO_NO_FLAG:
589 // FIXME: RIP THIS CHECKING CODE OUT EVENTUALLY.
591 assert(0 && "Not lowered right");
593 case X86II::MO_TLSGD:
596 case X86II::MO_GOTTPOFF:
599 isRIPRelative = true;
601 case X86II::MO_INDNTPOFF:
604 case X86II::MO_TPOFF:
607 case X86II::MO_NTPOFF:
614 } else if (isMemOp) {
615 if (shouldPrintGOT(TM, Subtarget)) {
616 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
620 } else if (Subtarget->isPICStyleRIPRel() &&
622 if (TM.getRelocationModel() != Reloc::Static) {
623 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
627 isRIPRelative = true;
631 // Use rip when possible to reduce code size, except when
632 // index or base register are also part of the address. e.g.
633 // foo(%rip)(%rcx,%rax,4) is not legal.
639 case MachineOperand::MO_ExternalSymbol: {
640 /// NOTE: MO_ExternalSymbol in a non-pcrel_imm context is *only* generated
641 /// by _GLOBAL_OFFSET_TABLE_ on X86-32. All others are call operands, which
643 assert(!Subtarget->is64Bit() && !Subtarget->isPICStyleRIPRel());
644 // These are never used as memory operands.
645 assert(!(Modifier && !strcmp(Modifier, "mem")));
648 O << TAI->getGlobalPrefix();
649 O << MO.getSymbolName();
651 if (MO.getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS) {
653 PrintPICBaseSymbol();
656 assert(MO.getTargetFlags() == X86II::MO_NO_FLAG &&
657 "Unknown operand flag for external symbol");
662 O << "<unknown operand type>"; return;
666 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
667 unsigned char value = MI->getOperand(Op).getImm();
668 assert(value <= 7 && "Invalid ssecc argument!");
670 case 0: O << "eq"; break;
671 case 1: O << "lt"; break;
672 case 2: O << "le"; break;
673 case 3: O << "unord"; break;
674 case 4: O << "neq"; break;
675 case 5: O << "nlt"; break;
676 case 6: O << "nle"; break;
677 case 7: O << "ord"; break;
681 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
682 const char *Modifier,
684 MachineOperand BaseReg = MI->getOperand(Op);
685 MachineOperand IndexReg = MI->getOperand(Op+2);
686 const MachineOperand &DispSpec = MI->getOperand(Op+3);
688 NotRIPRel |= IndexReg.getReg() || BaseReg.getReg();
689 if (DispSpec.isGlobal() ||
692 DispSpec.isSymbol()) {
693 printOperand(MI, Op+3, "mem", NotRIPRel);
695 int DispVal = DispSpec.getImm();
696 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
700 if (IndexReg.getReg() || BaseReg.getReg()) {
701 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
702 unsigned BaseRegOperand = 0, IndexRegOperand = 2;
704 // There are cases where we can end up with ESP/RSP in the indexreg slot.
705 // If this happens, swap the base/index register to support assemblers that
706 // don't work when the index is *SP.
707 if (IndexReg.getReg() == X86::ESP || IndexReg.getReg() == X86::RSP) {
708 assert(ScaleVal == 1 && "Scale not supported for stack pointer!");
709 std::swap(BaseReg, IndexReg);
710 std::swap(BaseRegOperand, IndexRegOperand);
714 if (BaseReg.getReg())
715 printOperand(MI, Op+BaseRegOperand, Modifier);
717 if (IndexReg.getReg()) {
719 printOperand(MI, Op+IndexRegOperand, Modifier);
721 O << ',' << ScaleVal;
727 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
728 const char *Modifier, bool NotRIPRel){
729 assert(isMem(MI, Op) && "Invalid memory reference!");
730 MachineOperand Segment = MI->getOperand(Op+4);
731 if (Segment.getReg()) {
732 printOperand(MI, Op+4, Modifier);
735 printLeaMemReference(MI, Op, Modifier, NotRIPRel);
738 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
739 const MachineBasicBlock *MBB) const {
740 if (!TAI->getSetDirective())
743 // We don't need .set machinery if we have GOT-style relocations
744 if (Subtarget->isPICStyleGOT())
747 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
748 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
749 printBasicBlockLabel(MBB, false, false, false);
750 if (Subtarget->isPICStyleRIPRel())
751 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
752 << '_' << uid << '\n';
755 PrintPICBaseSymbol();
761 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
762 PrintPICBaseSymbol();
764 PrintPICBaseSymbol();
769 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
770 const MachineBasicBlock *MBB,
773 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
774 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
776 O << JTEntryDirective << ' ';
778 if (TM.getRelocationModel() == Reloc::PIC_) {
779 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) {
780 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
781 << '_' << uid << "_set_" << MBB->getNumber();
782 } else if (Subtarget->isPICStyleGOT()) {
783 printBasicBlockLabel(MBB, false, false, false);
786 assert(0 && "Don't know how to print MBB label for this PIC mode");
788 printBasicBlockLabel(MBB, false, false, false);
791 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
792 unsigned Reg = MO.getReg();
794 default: return true; // Unknown mode.
795 case 'b': // Print QImode register
796 Reg = getX86SubSuperRegister(Reg, MVT::i8);
798 case 'h': // Print QImode high register
799 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
801 case 'w': // Print HImode register
802 Reg = getX86SubSuperRegister(Reg, MVT::i16);
804 case 'k': // Print SImode register
805 Reg = getX86SubSuperRegister(Reg, MVT::i32);
807 case 'q': // Print DImode register
808 Reg = getX86SubSuperRegister(Reg, MVT::i64);
812 O << '%'<< TRI->getAsmName(Reg);
816 /// PrintAsmOperand - Print out an operand for an inline asm expression.
818 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
820 const char *ExtraCode) {
821 // Does this asm operand have a single letter operand modifier?
822 if (ExtraCode && ExtraCode[0]) {
823 if (ExtraCode[1] != 0) return true; // Unknown modifier.
825 switch (ExtraCode[0]) {
826 default: return true; // Unknown modifier.
827 case 'c': // Don't print "$" before a global var name or constant.
828 printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true);
830 case 'b': // Print QImode register
831 case 'h': // Print QImode high register
832 case 'w': // Print HImode register
833 case 'k': // Print SImode register
834 case 'q': // Print DImode register
835 if (MI->getOperand(OpNo).isReg())
836 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
837 printOperand(MI, OpNo);
840 case 'P': // Don't print @PLT, but do print as memory.
841 printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true);
846 printOperand(MI, OpNo);
850 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
853 const char *ExtraCode) {
854 if (ExtraCode && ExtraCode[0]) {
855 if (ExtraCode[1] != 0) return true; // Unknown modifier.
857 switch (ExtraCode[0]) {
858 default: return true; // Unknown modifier.
859 case 'b': // Print QImode register
860 case 'h': // Print QImode high register
861 case 'w': // Print HImode register
862 case 'k': // Print SImode register
863 case 'q': // Print SImode register
864 // These only apply to registers, ignore on mem.
866 case 'P': // Don't print @PLT, but do print as memory.
867 printMemReference(MI, OpNo, "mem", /*NotRIPRel=*/true);
871 printMemReference(MI, OpNo);
875 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
876 // Convert registers in the addr mode according to subreg64.
877 for (unsigned i = 0; i != 4; ++i) {
878 if (!MI->getOperand(i).isReg()) continue;
880 unsigned Reg = MI->getOperand(i).getReg();
881 if (Reg == 0) continue;
883 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
887 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
888 /// AT&T syntax to the current output stream.
890 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
894 if (MI->getOpcode() == TargetInstrInfo::INLINEASM) {
898 } else if (MI->isLabel()) {
901 } else if (MI->getOpcode() == TargetInstrInfo::DECLARE) {
904 } else if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
905 printImplicitDef(MI);
912 TmpInst.setOpcode(MI->getOpcode());
914 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
915 const MachineOperand &MO = MI->getOperand(i);
919 MCOp.MakeReg(MO.getReg());
920 } else if (MO.isImm()) {
921 MCOp.MakeImm(MO.getImm());
922 } else if (MO.isMBB()) {
923 MCOp.MakeMBBLabel(getFunctionNumber(), MO.getMBB()->getNumber());
925 assert(0 && "Unimp");
928 TmpInst.addOperand(MCOp);
931 switch (TmpInst.getOpcode()) {
933 // Handle the 'subreg rewriting' for the lea64_32mem operand.
934 lower_lea64_32mem(&TmpInst, 1);
938 // FIXME: Convert TmpInst.
939 printInstruction(&TmpInst);
943 // Call the autogenerated instruction printer routines.
944 printInstruction(MI);
948 bool X86ATTAsmPrinter::doInitialization(Module &M) {
950 Context = new MCContext();
951 // FIXME: Send this to "O" instead of outs(). For now, we force it to
952 // stdout to make it easy to compare.
953 Streamer = createAsmStreamer(*Context, outs());
956 return AsmPrinter::doInitialization(M);
959 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
960 const TargetData *TD = TM.getTargetData();
962 if (!GVar->hasInitializer())
963 return; // External global require no code
965 // Check to see if this is a special global used by LLVM, if so, emit it.
966 if (EmitSpecialLLVMGlobal(GVar)) {
967 if (Subtarget->isTargetDarwin() &&
968 TM.getRelocationModel() == Reloc::Static) {
969 if (GVar->getName() == "llvm.global_ctors")
970 O << ".reference .constructors_used\n";
971 else if (GVar->getName() == "llvm.global_dtors")
972 O << ".reference .destructors_used\n";
977 std::string name = Mang->getValueName(GVar);
978 Constant *C = GVar->getInitializer();
979 if (isa<MDNode>(C) || isa<MDString>(C))
981 const Type *Type = C->getType();
982 unsigned Size = TD->getTypeAllocSize(Type);
983 unsigned Align = TD->getPreferredAlignmentLog(GVar);
985 printVisibility(name, GVar->getVisibility());
987 if (Subtarget->isTargetELF())
988 O << "\t.type\t" << name << ",@object\n";
990 SwitchToSection(TAI->SectionForGlobal(GVar));
992 if (C->isNullValue() && !GVar->hasSection() &&
993 !(Subtarget->isTargetDarwin() &&
994 TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
995 // FIXME: This seems to be pretty darwin-specific
996 if (GVar->hasExternalLinkage()) {
997 if (const char *Directive = TAI->getZeroFillDirective()) {
998 O << "\t.globl " << name << '\n';
999 O << Directive << "__DATA, __common, " << name << ", "
1000 << Size << ", " << Align << '\n';
1005 if (!GVar->isThreadLocal() &&
1006 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
1007 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
1009 if (TAI->getLCOMMDirective() != NULL) {
1010 if (GVar->hasLocalLinkage()) {
1011 O << TAI->getLCOMMDirective() << name << ',' << Size;
1012 if (Subtarget->isTargetDarwin())
1014 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
1015 O << "\t.globl " << name << '\n'
1016 << TAI->getWeakDefDirective() << name << '\n';
1017 EmitAlignment(Align, GVar);
1020 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
1021 PrintUnmangledNameSafely(GVar, O);
1024 EmitGlobalConstant(C);
1027 O << TAI->getCOMMDirective() << name << ',' << Size;
1028 if (TAI->getCOMMDirectiveTakesAlignment())
1029 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
1032 if (!Subtarget->isTargetCygMing()) {
1033 if (GVar->hasLocalLinkage())
1034 O << "\t.local\t" << name << '\n';
1036 O << TAI->getCOMMDirective() << name << ',' << Size;
1037 if (TAI->getCOMMDirectiveTakesAlignment())
1038 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
1041 O << "\t\t" << TAI->getCommentString() << ' ';
1042 PrintUnmangledNameSafely(GVar, O);
1049 switch (GVar->getLinkage()) {
1050 case GlobalValue::CommonLinkage:
1051 case GlobalValue::LinkOnceAnyLinkage:
1052 case GlobalValue::LinkOnceODRLinkage:
1053 case GlobalValue::WeakAnyLinkage:
1054 case GlobalValue::WeakODRLinkage:
1055 if (Subtarget->isTargetDarwin()) {
1056 O << "\t.globl " << name << '\n'
1057 << TAI->getWeakDefDirective() << name << '\n';
1058 } else if (Subtarget->isTargetCygMing()) {
1059 O << "\t.globl\t" << name << "\n"
1060 "\t.linkonce same_size\n";
1062 O << "\t.weak\t" << name << '\n';
1065 case GlobalValue::DLLExportLinkage:
1066 case GlobalValue::AppendingLinkage:
1067 // FIXME: appending linkage variables should go into a section of
1068 // their name or something. For now, just emit them as external.
1069 case GlobalValue::ExternalLinkage:
1070 // If external or appending, declare as a global symbol
1071 O << "\t.globl " << name << '\n';
1073 case GlobalValue::PrivateLinkage:
1074 case GlobalValue::InternalLinkage:
1077 assert(0 && "Unknown linkage type!");
1080 EmitAlignment(Align, GVar);
1083 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
1084 PrintUnmangledNameSafely(GVar, O);
1087 if (TAI->hasDotTypeDotSizeDirective())
1088 O << "\t.size\t" << name << ", " << Size << '\n';
1090 EmitGlobalConstant(C);
1093 bool X86ATTAsmPrinter::doFinalization(Module &M) {
1094 // Print out module-level global variables here.
1095 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
1097 printModuleLevelGV(I);
1099 if (I->hasDLLExportLinkage())
1100 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
1103 if (Subtarget->isTargetDarwin()) {
1104 SwitchToDataSection("");
1106 // Add the (possibly multiple) personalities to the set of global value
1107 // stubs. Only referenced functions get into the Personalities list.
1108 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
1109 const std::vector<Function*> &Personalities = MMI->getPersonalities();
1110 for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
1111 if (Personalities[i] == 0)
1113 std::string Name = Mang->getValueName(Personalities[i]);
1114 decorateName(Name, Personalities[i]);
1115 GVStubs.insert(Name);
1119 // Output stubs for dynamically-linked functions
1120 if (!FnStubs.empty()) {
1121 for (StringSet<>::iterator I = FnStubs.begin(), E = FnStubs.end();
1123 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
1124 "self_modifying_code+pure_instructions,5", 0);
1125 const char *Name = I->getKeyData();
1126 printSuffixedName(Name, "$stub");
1128 "\t.indirect_symbol " << Name << "\n"
1129 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
1134 // Output stubs for external and common global variables.
1135 if (!GVStubs.empty()) {
1136 SwitchToDataSection(
1137 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1138 for (StringSet<>::iterator I = GVStubs.begin(), E = GVStubs.end();
1140 const char *Name = I->getKeyData();
1141 printSuffixedName(Name, "$non_lazy_ptr");
1142 O << ":\n\t.indirect_symbol " << Name << "\n\t.long\t0\n";
1146 if (!HiddenGVStubs.empty()) {
1147 SwitchToSection(TAI->getDataSection());
1149 for (StringSet<>::iterator I = HiddenGVStubs.begin(),
1150 E = HiddenGVStubs.end(); I != E; ++I) {
1151 const char *Name = I->getKeyData();
1152 printSuffixedName(Name, "$non_lazy_ptr");
1153 O << ":\n" << TAI->getData32bitsDirective() << Name << '\n';
1157 // Funny Darwin hack: This flag tells the linker that no global symbols
1158 // contain code that falls through to other global symbols (e.g. the obvious
1159 // implementation of multiple entry points). If this doesn't occur, the
1160 // linker can safely perform dead code stripping. Since LLVM never
1161 // generates code that does this, it is always safe to set.
1162 O << "\t.subsections_via_symbols\n";
1163 } else if (Subtarget->isTargetCygMing()) {
1164 // Emit type information for external functions
1165 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
1167 O << "\t.def\t " << i->getKeyData()
1168 << ";\t.scl\t" << COFF::C_EXT
1169 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
1175 // Output linker support code for dllexported globals on windows.
1176 if (!DLLExportedGVs.empty()) {
1177 SwitchToDataSection(".section .drectve");
1179 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
1180 e = DLLExportedGVs.end(); i != e; ++i)
1181 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1184 if (!DLLExportedFns.empty()) {
1185 SwitchToDataSection(".section .drectve");
1187 for (StringSet<>::iterator i = DLLExportedFns.begin(),
1188 e = DLLExportedFns.end();
1190 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1193 // Do common shutdown.
1194 bool Changed = AsmPrinter::doFinalization(M);
1196 if (NewAsmPrinter) {
1208 // Include the auto-generated portion of the assembly writer.
1209 #include "X86GenAsmWriter.inc"