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/ErrorHandling.h"
37 #include "llvm/Support/FormattedStream.h"
38 #include "llvm/Support/Mangler.h"
39 #include "llvm/Target/TargetAsmInfo.h"
40 #include "llvm/Target/TargetLoweringObjectFile.h"
41 #include "llvm/Target/TargetOptions.h"
44 STATISTIC(EmittedInsts, "Number of machine instrs printed");
46 static cl::opt<bool> NewAsmPrinter("experimental-asm-printer",
49 //===----------------------------------------------------------------------===//
50 // Primitive Helper Functions.
51 //===----------------------------------------------------------------------===//
53 void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
54 if (Subtarget->isTargetDarwin())
55 O << "\"L" << getFunctionNumber() << "$pb\"";
56 else if (Subtarget->isTargetELF())
57 O << ".Lllvm$" << getFunctionNumber() << ".$piclabel";
59 llvm_unreachable("Don't know how to print PIC label!");
62 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
63 /// Don't print things like \\n or \\0.
64 static void PrintUnmangledNameSafely(const Value *V,
65 formatted_raw_ostream &OS) {
66 for (StringRef::iterator it = V->getName().begin(),
67 ie = V->getName().end(); it != ie; ++it)
72 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
73 const TargetData *TD) {
74 X86MachineFunctionInfo Info;
77 switch (F->getCallingConv()) {
78 case CallingConv::X86_StdCall:
79 Info.setDecorationStyle(StdCall);
81 case CallingConv::X86_FastCall:
82 Info.setDecorationStyle(FastCall);
89 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
90 AI != AE; ++AI, ++argNum) {
91 const Type* Ty = AI->getType();
93 // 'Dereference' type in case of byval parameter attribute
94 if (F->paramHasAttr(argNum, Attribute::ByVal))
95 Ty = cast<PointerType>(Ty)->getElementType();
97 // Size should be aligned to DWORD boundary
98 Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
101 // We're not supporting tooooo huge arguments :)
102 Info.setBytesToPopOnReturn((unsigned int)Size);
106 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
107 /// various name decorations for Cygwin and MingW.
108 void X86ATTAsmPrinter::DecorateCygMingName(std::string &Name,
109 const GlobalValue *GV) {
110 assert(Subtarget->isTargetCygMing() && "This is only for cygwin and mingw");
112 const Function *F = dyn_cast<Function>(GV);
115 // Save function name for later type emission.
116 if (F->isDeclaration())
117 CygMingStubs.insert(Name);
119 // We don't want to decorate non-stdcall or non-fastcall functions right now
120 unsigned CC = F->getCallingConv();
121 if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
125 const X86MachineFunctionInfo *Info;
127 FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
128 if (info_item == FunctionInfoMap.end()) {
129 // Calculate apropriate function info and populate map
130 FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
131 Info = &FunctionInfoMap[F];
133 Info = &info_item->second;
136 const FunctionType *FT = F->getFunctionType();
137 switch (Info->getDecorationStyle()) {
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());
147 // "Pure" variadic functions do not receive @0 suffix.
148 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
149 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
150 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
152 if (Name[0] == '_') {
159 llvm_unreachable("Unsupported DecorationStyle");
163 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
164 unsigned FnAlign = MF.getAlignment();
165 const Function *F = MF.getFunction();
167 if (Subtarget->isTargetCygMing())
168 DecorateCygMingName(CurrentFnName, F);
170 SwitchToSection(getObjFileLowering().SectionForGlobal(F, TM));
171 switch (F->getLinkage()) {
172 default: llvm_unreachable("Unknown linkage type!");
173 case Function::InternalLinkage: // Symbols default to internal.
174 case Function::PrivateLinkage:
175 case Function::LinkerPrivateLinkage:
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->getMangledName(F));
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 /// printSymbolOperand - Print a raw symbol reference operand. This handles
294 /// jump tables, constant pools, global address and external symbols, all of
295 /// which print to a label with various suffixes for relocation types etc.
296 void X86ATTAsmPrinter::printSymbolOperand(const MachineOperand &MO) {
297 switch (MO.getType()) {
298 default: llvm_unreachable("unknown symbol type!");
299 case MachineOperand::MO_JumpTableIndex:
300 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
303 case MachineOperand::MO_ConstantPoolIndex:
304 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
306 printOffset(MO.getOffset());
308 case MachineOperand::MO_GlobalAddress: {
309 const GlobalValue *GV = MO.getGlobal();
311 const char *Suffix = "";
312 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
314 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
315 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
316 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
317 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
318 Suffix = "$non_lazy_ptr";
320 std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
321 if (Subtarget->isTargetCygMing())
322 DecorateCygMingName(Name, GV);
324 // Handle dllimport linkage.
325 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
326 Name = "__imp_" + Name;
328 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
329 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE)
330 GVStubs[Name] = Mang->getMangledName(GV);
331 else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
332 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
333 HiddenGVStubs[Name] = Mang->getMangledName(GV);
334 else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
335 FnStubs[Name] = Mang->getMangledName(GV);
337 // If the name begins with a dollar-sign, enclose it in parens. We do this
338 // to avoid having it look like an integer immediate to the assembler.
340 O << '(' << Name << ')';
344 printOffset(MO.getOffset());
347 case MachineOperand::MO_ExternalSymbol: {
348 std::string Name = Mang->makeNameProper(MO.getSymbolName());
349 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
350 FnStubs[Name+"$stub"] = Name;
354 // If the name begins with a dollar-sign, enclose it in parens. We do this
355 // to avoid having it look like an integer immediate to the assembler.
357 O << '(' << Name << ')';
364 switch (MO.getTargetFlags()) {
366 llvm_unreachable("Unknown target flag on GV operand");
367 case X86II::MO_NO_FLAG: // No flag.
369 case X86II::MO_DARWIN_NONLAZY:
370 case X86II::MO_DARWIN_HIDDEN_NONLAZY:
371 case X86II::MO_DLLIMPORT:
372 case X86II::MO_DARWIN_STUB:
373 // These affect the name of the symbol, not any suffix.
375 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
377 PrintPICBaseSymbol();
380 case X86II::MO_PIC_BASE_OFFSET:
381 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
382 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
384 PrintPICBaseSymbol();
386 case X86II::MO_TLSGD: O << "@TLSGD"; break;
387 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
388 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
389 case X86II::MO_TPOFF: O << "@TPOFF"; break;
390 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
391 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
392 case X86II::MO_GOT: O << "@GOT"; break;
393 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
394 case X86II::MO_PLT: O << "@PLT"; break;
398 /// print_pcrel_imm - This is used to print an immediate value that ends up
399 /// being encoded as a pc-relative value. These print slightly differently, for
400 /// example, a $ is not emitted.
401 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
402 const MachineOperand &MO = MI->getOperand(OpNo);
403 switch (MO.getType()) {
404 default: llvm_unreachable("Unknown pcrel immediate operand");
405 case MachineOperand::MO_Immediate:
408 case MachineOperand::MO_MachineBasicBlock:
409 printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
411 case MachineOperand::MO_GlobalAddress:
412 case MachineOperand::MO_ExternalSymbol:
413 printSymbolOperand(MO);
420 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
421 const char *Modifier) {
422 const MachineOperand &MO = MI->getOperand(OpNo);
423 switch (MO.getType()) {
424 default: llvm_unreachable("unknown operand type!");
425 case MachineOperand::MO_Register: {
426 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
427 "Virtual registers should not make it this far!");
429 unsigned Reg = MO.getReg();
430 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
431 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
432 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
433 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
434 Reg = getX86SubSuperRegister(Reg, VT);
436 O << TRI->getAsmName(Reg);
440 case MachineOperand::MO_Immediate:
441 O << '$' << MO.getImm();
444 case MachineOperand::MO_JumpTableIndex:
445 case MachineOperand::MO_ConstantPoolIndex:
446 case MachineOperand::MO_GlobalAddress:
447 case MachineOperand::MO_ExternalSymbol: {
449 printSymbolOperand(MO);
455 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
456 unsigned char value = MI->getOperand(Op).getImm();
457 assert(value <= 7 && "Invalid ssecc argument!");
459 case 0: O << "eq"; break;
460 case 1: O << "lt"; break;
461 case 2: O << "le"; break;
462 case 3: O << "unord"; break;
463 case 4: O << "neq"; break;
464 case 5: O << "nlt"; break;
465 case 6: O << "nle"; break;
466 case 7: O << "ord"; break;
470 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
471 const char *Modifier) {
472 const MachineOperand &BaseReg = MI->getOperand(Op);
473 const MachineOperand &IndexReg = MI->getOperand(Op+2);
474 const MachineOperand &DispSpec = MI->getOperand(Op+3);
476 // If we really don't want to print out (rip), don't.
477 bool HasBaseReg = BaseReg.getReg() != 0;
478 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
479 BaseReg.getReg() == X86::RIP)
482 // HasParenPart - True if we will print out the () part of the mem ref.
483 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
485 if (DispSpec.isImm()) {
486 int DispVal = DispSpec.getImm();
487 if (DispVal || !HasParenPart)
490 assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
491 DispSpec.isJTI() || DispSpec.isSymbol());
492 printSymbolOperand(MI->getOperand(Op+3));
496 assert(IndexReg.getReg() != X86::ESP &&
497 "X86 doesn't allow scaling by ESP");
501 printOperand(MI, Op, Modifier);
503 if (IndexReg.getReg()) {
505 printOperand(MI, Op+2, Modifier);
506 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
508 O << ',' << ScaleVal;
514 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
515 const char *Modifier) {
516 assert(isMem(MI, Op) && "Invalid memory reference!");
517 const MachineOperand &Segment = MI->getOperand(Op+4);
518 if (Segment.getReg()) {
519 printOperand(MI, Op+4, Modifier);
522 printLeaMemReference(MI, Op, Modifier);
525 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
526 const MachineBasicBlock *MBB) const {
527 if (!TAI->getSetDirective())
530 // We don't need .set machinery if we have GOT-style relocations
531 if (Subtarget->isPICStyleGOT())
534 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
535 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
536 printBasicBlockLabel(MBB, false, false, false);
537 if (Subtarget->isPICStyleRIPRel())
538 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
539 << '_' << uid << '\n';
542 PrintPICBaseSymbol();
548 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
549 PrintPICBaseSymbol();
551 PrintPICBaseSymbol();
556 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
557 const MachineBasicBlock *MBB,
558 unsigned uid) const {
559 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
560 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
562 O << JTEntryDirective << ' ';
564 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
565 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
566 << '_' << uid << "_set_" << MBB->getNumber();
567 } else if (Subtarget->isPICStyleGOT()) {
568 printBasicBlockLabel(MBB, false, false, false);
571 printBasicBlockLabel(MBB, false, false, false);
574 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
575 unsigned Reg = MO.getReg();
577 default: return true; // Unknown mode.
578 case 'b': // Print QImode register
579 Reg = getX86SubSuperRegister(Reg, MVT::i8);
581 case 'h': // Print QImode high register
582 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
584 case 'w': // Print HImode register
585 Reg = getX86SubSuperRegister(Reg, MVT::i16);
587 case 'k': // Print SImode register
588 Reg = getX86SubSuperRegister(Reg, MVT::i32);
590 case 'q': // Print DImode register
591 Reg = getX86SubSuperRegister(Reg, MVT::i64);
595 O << '%'<< TRI->getAsmName(Reg);
599 /// PrintAsmOperand - Print out an operand for an inline asm expression.
601 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
603 const char *ExtraCode) {
604 // Does this asm operand have a single letter operand modifier?
605 if (ExtraCode && ExtraCode[0]) {
606 if (ExtraCode[1] != 0) return true; // Unknown modifier.
608 const MachineOperand &MO = MI->getOperand(OpNo);
610 switch (ExtraCode[0]) {
611 default: return true; // Unknown modifier.
612 case 'c': // Don't print "$" before a global var name or constant.
615 else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
616 printSymbolOperand(MO);
618 printOperand(MI, OpNo);
621 case 'A': // Print '*' before a register (it must be a register)
624 printOperand(MI, OpNo);
629 case 'b': // Print QImode register
630 case 'h': // Print QImode high register
631 case 'w': // Print HImode register
632 case 'k': // Print SImode register
633 case 'q': // Print DImode register
635 return printAsmMRegister(MO, ExtraCode[0]);
636 printOperand(MI, OpNo);
639 case 'P': // This is the operand of a call, treat specially.
640 print_pcrel_imm(MI, OpNo);
643 case 'n': // Negate the immediate or print a '-' before the operand.
644 // Note: this is a temporary solution. It should be handled target
645 // independently as part of the 'MC' work.
654 printOperand(MI, OpNo);
658 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
661 const char *ExtraCode) {
662 if (ExtraCode && ExtraCode[0]) {
663 if (ExtraCode[1] != 0) return true; // Unknown modifier.
665 switch (ExtraCode[0]) {
666 default: return true; // Unknown modifier.
667 case 'b': // Print QImode register
668 case 'h': // Print QImode high register
669 case 'w': // Print HImode register
670 case 'k': // Print SImode register
671 case 'q': // Print SImode register
672 // These only apply to registers, ignore on mem.
674 case 'P': // Don't print @PLT, but do print as memory.
675 printMemReference(MI, OpNo, "no-rip");
679 printMemReference(MI, OpNo);
683 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
684 // Convert registers in the addr mode according to subreg64.
685 for (unsigned i = 0; i != 4; ++i) {
686 if (!MI->getOperand(i).isReg()) continue;
688 unsigned Reg = MI->getOperand(i).getReg();
689 if (Reg == 0) continue;
691 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
695 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
696 /// AT&T syntax to the current output stream.
698 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
702 if (MI->getOpcode() == TargetInstrInfo::INLINEASM) {
706 } else if (MI->isLabel()) {
709 } else if (MI->getOpcode() == TargetInstrInfo::DECLARE) {
712 } else if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
713 printImplicitDef(MI);
720 TmpInst.setOpcode(MI->getOpcode());
722 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
723 const MachineOperand &MO = MI->getOperand(i);
727 MCOp.MakeReg(MO.getReg());
728 } else if (MO.isImm()) {
729 MCOp.MakeImm(MO.getImm());
730 } else if (MO.isMBB()) {
731 MCOp.MakeMBBLabel(getFunctionNumber(), MO.getMBB()->getNumber());
733 llvm_unreachable("Unimp");
736 TmpInst.addOperand(MCOp);
739 switch (TmpInst.getOpcode()) {
741 // Handle the 'subreg rewriting' for the lea64_32mem operand.
742 lower_lea64_32mem(&TmpInst, 1);
746 // FIXME: Convert TmpInst.
747 printInstruction(&TmpInst);
751 // Call the autogenerated instruction printer routines.
752 printInstruction(MI);
755 void X86ATTAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
756 const TargetData *TD = TM.getTargetData();
758 if (!GVar->hasInitializer())
759 return; // External global require no code
761 // Check to see if this is a special global used by LLVM, if so, emit it.
762 if (EmitSpecialLLVMGlobal(GVar)) {
763 if (Subtarget->isTargetDarwin() &&
764 TM.getRelocationModel() == Reloc::Static) {
765 if (GVar->getName() == "llvm.global_ctors")
766 O << ".reference .constructors_used\n";
767 else if (GVar->getName() == "llvm.global_dtors")
768 O << ".reference .destructors_used\n";
773 std::string name = Mang->getMangledName(GVar);
774 Constant *C = GVar->getInitializer();
775 if (isa<MDNode>(C) || isa<MDString>(C))
777 const Type *Type = C->getType();
778 unsigned Size = TD->getTypeAllocSize(Type);
779 unsigned Align = TD->getPreferredAlignmentLog(GVar);
781 printVisibility(name, GVar->getVisibility());
783 if (Subtarget->isTargetELF())
784 O << "\t.type\t" << name << ",@object\n";
786 const Section *TheSection = getObjFileLowering().SectionForGlobal(GVar, TM);
787 SwitchToSection(TheSection);
789 if (C->isNullValue() && !GVar->hasSection() &&
790 // Don't put things that should go in the cstring section into "comm".
791 !TheSection->getKind().isMergeableCString()) {
792 if (GVar->hasExternalLinkage()) {
793 if (const char *Directive = TAI->getZeroFillDirective()) {
794 O << "\t.globl " << name << '\n';
795 O << Directive << "__DATA, __common, " << name << ", "
796 << Size << ", " << Align << '\n';
801 if (!GVar->isThreadLocal() &&
802 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
803 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
805 if (TAI->getLCOMMDirective() != NULL) {
806 if (GVar->hasLocalLinkage()) {
807 O << TAI->getLCOMMDirective() << name << ',' << Size;
808 if (Subtarget->isTargetDarwin())
810 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
811 O << "\t.globl " << name << '\n'
812 << TAI->getWeakDefDirective() << name << '\n';
813 EmitAlignment(Align, GVar);
816 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
817 PrintUnmangledNameSafely(GVar, O);
820 EmitGlobalConstant(C);
823 O << TAI->getCOMMDirective() << name << ',' << Size;
824 if (TAI->getCOMMDirectiveTakesAlignment())
825 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
828 if (!Subtarget->isTargetCygMing()) {
829 if (GVar->hasLocalLinkage())
830 O << "\t.local\t" << name << '\n';
832 O << TAI->getCOMMDirective() << name << ',' << Size;
833 if (TAI->getCOMMDirectiveTakesAlignment())
834 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
837 O << "\t\t" << TAI->getCommentString() << ' ';
838 PrintUnmangledNameSafely(GVar, O);
845 switch (GVar->getLinkage()) {
846 case GlobalValue::CommonLinkage:
847 case GlobalValue::LinkOnceAnyLinkage:
848 case GlobalValue::LinkOnceODRLinkage:
849 case GlobalValue::WeakAnyLinkage:
850 case GlobalValue::WeakODRLinkage:
851 if (Subtarget->isTargetDarwin()) {
852 O << "\t.globl " << name << '\n'
853 << TAI->getWeakDefDirective() << name << '\n';
854 } else if (Subtarget->isTargetCygMing()) {
855 O << "\t.globl\t" << name << "\n"
856 "\t.linkonce same_size\n";
858 O << "\t.weak\t" << name << '\n';
861 case GlobalValue::DLLExportLinkage:
862 case GlobalValue::AppendingLinkage:
863 // FIXME: appending linkage variables should go into a section of
864 // their name or something. For now, just emit them as external.
865 case GlobalValue::ExternalLinkage:
866 // If external or appending, declare as a global symbol
867 O << "\t.globl " << name << '\n';
869 case GlobalValue::PrivateLinkage:
870 case GlobalValue::LinkerPrivateLinkage:
871 case GlobalValue::InternalLinkage:
874 llvm_unreachable("Unknown linkage type!");
877 EmitAlignment(Align, GVar);
880 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
881 PrintUnmangledNameSafely(GVar, O);
884 if (TAI->hasDotTypeDotSizeDirective())
885 O << "\t.size\t" << name << ", " << Size << '\n';
887 EmitGlobalConstant(C);
890 bool X86ATTAsmPrinter::doFinalization(Module &M) {
891 // Print out module-level global variables here.
892 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
894 if (I->hasDLLExportLinkage())
895 DLLExportedGVs.insert(Mang->getMangledName(I));
898 if (Subtarget->isTargetDarwin()) {
899 SwitchToDataSection("");
901 // Add the (possibly multiple) personalities to the set of global value
902 // stubs. Only referenced functions get into the Personalities list.
903 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
904 const std::vector<Function*> &Personalities = MMI->getPersonalities();
905 for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
906 if (Personalities[i])
907 GVStubs[Mang->getMangledName(Personalities[i], "$non_lazy_ptr",
908 true /*private label*/)] =
909 Mang->getMangledName(Personalities[i]);
913 // Output stubs for dynamically-linked functions
914 if (!FnStubs.empty()) {
915 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
916 "self_modifying_code+pure_instructions,5", 0);
917 for (StringMap<std::string>::iterator I = FnStubs.begin(),
918 E = FnStubs.end(); I != E; ++I)
919 O << I->getKeyData() << ":\n" << "\t.indirect_symbol " << I->second
920 << "\n\thlt ; hlt ; hlt ; hlt ; hlt\n";
924 // Output stubs for external and common global variables.
925 if (!GVStubs.empty()) {
927 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
928 for (StringMap<std::string>::iterator I = GVStubs.begin(),
929 E = GVStubs.end(); I != E; ++I)
930 O << I->getKeyData() << ":\n\t.indirect_symbol "
931 << I->second << "\n\t.long\t0\n";
934 if (!HiddenGVStubs.empty()) {
935 SwitchToSection(getObjFileLowering().getDataSection());
937 for (StringMap<std::string>::iterator I = HiddenGVStubs.begin(),
938 E = HiddenGVStubs.end(); I != E; ++I)
939 O << I->getKeyData() << ":\n" << TAI->getData32bitsDirective()
940 << I->second << '\n';
943 // Funny Darwin hack: This flag tells the linker that no global symbols
944 // contain code that falls through to other global symbols (e.g. the obvious
945 // implementation of multiple entry points). If this doesn't occur, the
946 // linker can safely perform dead code stripping. Since LLVM never
947 // generates code that does this, it is always safe to set.
948 O << "\t.subsections_via_symbols\n";
949 } else if (Subtarget->isTargetCygMing()) {
950 // Emit type information for external functions
951 for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
953 O << "\t.def\t " << i->getKeyData()
954 << ";\t.scl\t" << COFF::C_EXT
955 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
961 // Output linker support code for dllexported globals on windows.
962 if (!DLLExportedGVs.empty()) {
963 SwitchToDataSection(".section .drectve");
965 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
966 e = DLLExportedGVs.end(); i != e; ++i)
967 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
970 if (!DLLExportedFns.empty()) {
971 SwitchToDataSection(".section .drectve");
973 for (StringSet<>::iterator i = DLLExportedFns.begin(),
974 e = DLLExportedFns.end();
976 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
979 // Do common shutdown.
980 return AsmPrinter::doFinalization(M);
983 // Include the auto-generated portion of the assembly writer.
984 #include "X86GenAsmWriter.inc"