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/Mangler.h"
38 #include "llvm/Support/raw_ostream.h"
39 #include "llvm/Target/TargetAsmInfo.h"
40 #include "llvm/Target/TargetOptions.h"
43 STATISTIC(EmittedInsts, "Number of machine instrs printed");
45 static cl::opt<bool> NewAsmPrinter("experimental-asm-printer",
48 //===----------------------------------------------------------------------===//
49 // Primitive Helper Functions.
50 //===----------------------------------------------------------------------===//
52 void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
53 if (Subtarget->isTargetDarwin())
54 O << "\"L" << getFunctionNumber() << "$pb\"";
55 else if (Subtarget->isTargetELF())
56 O << ".Lllvm$" << getFunctionNumber() << ".$piclabel";
58 LLVM_UNREACHABLE( "Don't know how to print PIC label!");
61 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
62 /// Don't print things like \\n or \\0.
63 static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
64 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
70 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
71 const TargetData *TD) {
72 X86MachineFunctionInfo Info;
75 switch (F->getCallingConv()) {
76 case CallingConv::X86_StdCall:
77 Info.setDecorationStyle(StdCall);
79 case CallingConv::X86_FastCall:
80 Info.setDecorationStyle(FastCall);
87 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
88 AI != AE; ++AI, ++argNum) {
89 const Type* Ty = AI->getType();
91 // 'Dereference' type in case of byval parameter attribute
92 if (F->paramHasAttr(argNum, Attribute::ByVal))
93 Ty = cast<PointerType>(Ty)->getElementType();
95 // Size should be aligned to DWORD boundary
96 Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
99 // We're not supporting tooooo huge arguments :)
100 Info.setBytesToPopOnReturn((unsigned int)Size);
104 /// decorateName - Query FunctionInfoMap and use this information for various
106 void X86ATTAsmPrinter::decorateName(std::string &Name,
107 const GlobalValue *GV) {
108 const Function *F = dyn_cast<Function>(GV);
111 // Save function name for later type emission.
112 if (Subtarget->isTargetCygMing() && F->isDeclaration())
113 CygMingStubs.insert(Name);
115 // We don't want to decorate non-stdcall or non-fastcall functions right now
116 unsigned CC = F->getCallingConv();
117 if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
120 // Decorate names only when we're targeting Cygwin/Mingw32 targets
121 if (!Subtarget->isTargetCygMing())
124 FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
126 const X86MachineFunctionInfo *Info;
127 if (info_item == FunctionInfoMap.end()) {
128 // Calculate apropriate function info and populate map
129 FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
130 Info = &FunctionInfoMap[F];
132 Info = &info_item->second;
135 const FunctionType *FT = F->getFunctionType();
136 switch (Info->getDecorationStyle()) {
140 // "Pure" variadic functions do not receive @0 suffix.
141 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
142 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
143 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
146 // "Pure" variadic functions do not receive @0 suffix.
147 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
148 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
149 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
151 if (Name[0] == '_') {
158 LLVM_UNREACHABLE( "Unsupported DecorationStyle");
162 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
163 unsigned FnAlign = MF.getAlignment();
164 const Function *F = MF.getFunction();
166 decorateName(CurrentFnName, F);
168 SwitchToSection(TAI->SectionForGlobal(F));
169 switch (F->getLinkage()) {
170 default: LLVM_UNREACHABLE( "Unknown linkage type!");
171 case Function::InternalLinkage: // Symbols default to internal.
172 case Function::PrivateLinkage:
173 EmitAlignment(FnAlign, F);
175 case Function::DLLExportLinkage:
176 case Function::ExternalLinkage:
177 EmitAlignment(FnAlign, F);
178 O << "\t.globl\t" << CurrentFnName << '\n';
180 case Function::LinkOnceAnyLinkage:
181 case Function::LinkOnceODRLinkage:
182 case Function::WeakAnyLinkage:
183 case Function::WeakODRLinkage:
184 EmitAlignment(FnAlign, F);
185 if (Subtarget->isTargetDarwin()) {
186 O << "\t.globl\t" << CurrentFnName << '\n';
187 O << TAI->getWeakDefDirective() << CurrentFnName << '\n';
188 } else if (Subtarget->isTargetCygMing()) {
189 O << "\t.globl\t" << CurrentFnName << "\n"
190 "\t.linkonce discard\n";
192 O << "\t.weak\t" << CurrentFnName << '\n';
197 printVisibility(CurrentFnName, F->getVisibility());
199 if (Subtarget->isTargetELF())
200 O << "\t.type\t" << CurrentFnName << ",@function\n";
201 else if (Subtarget->isTargetCygMing()) {
202 O << "\t.def\t " << CurrentFnName
204 (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
205 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
209 O << CurrentFnName << ":\n";
210 // Add some workaround for linkonce linkage on Cygwin\MinGW
211 if (Subtarget->isTargetCygMing() &&
212 (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
213 O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
216 /// runOnMachineFunction - This uses the printMachineInstruction()
217 /// method to print assembly for each instruction.
219 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
220 const Function *F = MF.getFunction();
222 unsigned CC = F->getCallingConv();
224 SetupMachineFunction(MF);
227 // Populate function information map. Actually, We don't want to populate
228 // non-stdcall or non-fastcall functions' information right now.
229 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
230 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
232 // Print out constants referenced by the function
233 EmitConstantPool(MF.getConstantPool());
235 if (F->hasDLLExportLinkage())
236 DLLExportedFns.insert(Mang->makeNameProper(F->getName(), ""));
238 // Print the 'header' of function
239 emitFunctionHeader(MF);
241 // Emit pre-function debug and/or EH information.
242 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
243 DW->BeginFunction(&MF);
245 // Print out code for the function.
246 bool hasAnyRealCode = false;
247 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
249 // Print a label for the basic block.
250 if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
251 // This is an entry block or a block that's only reachable via a
252 // fallthrough edge. In non-VerboseAsm mode, don't print the label.
254 printBasicBlockLabel(I, true, true, VerboseAsm);
257 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
259 // Print the assembly for the instruction.
261 hasAnyRealCode = true;
262 printMachineInstruction(II);
266 if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
267 // If the function is empty, then we need to emit *something*. Otherwise,
268 // the function's label might be associated with something that it wasn't
269 // meant to be associated with. We emit a noop in this situation.
270 // We are assuming inline asms are code.
274 if (TAI->hasDotTypeDotSizeDirective())
275 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
277 // Emit post-function debug information.
278 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
279 DW->EndFunction(&MF);
281 // Print out jump tables referenced by the function.
282 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
286 // We didn't modify anything.
290 /// print_pcrel_imm - This is used to print an immediate value that ends up
291 /// being encoded as a pc-relative value. These print slightly differently, for
292 /// example, a $ is not emitted.
293 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
294 const MachineOperand &MO = MI->getOperand(OpNo);
295 switch (MO.getType()) {
296 default: LLVM_UNREACHABLE( "Unknown pcrel immediate operand");
297 case MachineOperand::MO_Immediate:
300 case MachineOperand::MO_MachineBasicBlock:
301 printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
304 case MachineOperand::MO_GlobalAddress: {
305 const GlobalValue *GV = MO.getGlobal();
306 std::string Name = Mang->getValueName(GV);
307 decorateName(Name, GV);
309 bool needCloseParen = false;
310 if (Name[0] == '$') {
311 // The name begins with a dollar-sign. In order to avoid having it look
312 // like an integer immediate to the assembler, enclose it in parens.
314 needCloseParen = true;
317 // Handle dllimport linkage.
318 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
319 O << "__imp_" << Name;
320 else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
321 FnStubs.insert(Name);
322 printSuffixedName(Name, "$stub");
330 // Assemble call via PLT for externally visible symbols.
331 if (MO.getTargetFlags() == X86II::MO_PLT)
334 printOffset(MO.getOffset());
339 case MachineOperand::MO_ExternalSymbol: {
340 bool needCloseParen = false;
341 std::string Name(TAI->getGlobalPrefix());
342 Name += MO.getSymbolName();
344 if (Name[0] == '$') {
345 // The name begins with a dollar-sign. In order to avoid having it look
346 // like an integer immediate to the assembler, enclose it in parens.
348 needCloseParen = true;
351 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
352 FnStubs.insert(Name);
353 printSuffixedName(Name, "$stub");
358 if (MO.getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS) {
360 PrintPICBaseSymbol();
364 if (MO.getTargetFlags() == X86II::MO_PLT)
376 void X86ATTAsmPrinter::printSymbolOperand(const MachineOperand &MO) {
377 switch (MO.getType()) {
378 default: LLVM_UNREACHABLE("unknown symbol type!");
379 case MachineOperand::MO_JumpTableIndex: {
380 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
384 case MachineOperand::MO_ConstantPoolIndex: {
385 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
387 printOffset(MO.getOffset());
390 case MachineOperand::MO_GlobalAddress: {
391 const GlobalValue *GV = MO.getGlobal();
392 std::string Name = Mang->getValueName(GV);
393 decorateName(Name, GV);
395 bool needCloseParen = false;
396 if (Name[0] == '$') {
397 // The name begins with a dollar-sign. In order to avoid having it look
398 // like an integer immediate to the assembler, enclose it in parens.
400 needCloseParen = true;
403 // Handle dllimport linkage.
404 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT) {
405 O << "__imp_" << Name;
406 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
407 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
408 GVStubs.insert(Name);
409 printSuffixedName(Name, "$non_lazy_ptr");
410 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
411 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
412 HiddenGVStubs.insert(Name);
413 printSuffixedName(Name, "$non_lazy_ptr");
414 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
415 FnStubs.insert(Name);
416 printSuffixedName(Name, "$stub");
424 // Assemble call via PLT for externally visible symbols.
425 if (MO.getTargetFlags() == X86II::MO_PLT)
428 printOffset(MO.getOffset());
431 case MachineOperand::MO_ExternalSymbol:
432 /// NOTE: MO_ExternalSymbol in a non-pcrel_imm context is *only* generated
433 /// by _GLOBAL_OFFSET_TABLE_ on X86-32. All others are call operands, which
435 assert(!Subtarget->is64Bit());
436 O << TAI->getGlobalPrefix();
437 O << MO.getSymbolName();
441 switch (MO.getTargetFlags()) {
443 LLVM_UNREACHABLE( "Unknown target flag on GV operand");
444 case X86II::MO_NO_FLAG: // No flag.
446 case X86II::MO_DARWIN_NONLAZY:
447 case X86II::MO_DARWIN_HIDDEN_NONLAZY:
448 case X86II::MO_DLLIMPORT:
449 // These affect the name of the symbol, not any suffix.
451 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
453 PrintPICBaseSymbol();
456 case X86II::MO_PIC_BASE_OFFSET:
457 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
458 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
460 PrintPICBaseSymbol();
462 case X86II::MO_TLSGD: O << "@TLSGD"; break;
463 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
464 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
465 case X86II::MO_TPOFF: O << "@TPOFF"; break;
466 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
467 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
468 case X86II::MO_GOT: O << "@GOT"; break;
469 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
474 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
475 const char *Modifier) {
476 const MachineOperand &MO = MI->getOperand(OpNo);
477 switch (MO.getType()) {
478 default: LLVM_UNREACHABLE("unknown operand type!");
479 case MachineOperand::MO_Register: {
480 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
481 "Virtual registers should not make it this far!");
483 unsigned Reg = MO.getReg();
484 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
485 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
486 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
487 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
488 Reg = getX86SubSuperRegister(Reg, VT);
490 O << TRI->getAsmName(Reg);
494 case MachineOperand::MO_Immediate:
495 O << '$' << MO.getImm();
498 case MachineOperand::MO_JumpTableIndex:
499 case MachineOperand::MO_ConstantPoolIndex:
500 case MachineOperand::MO_GlobalAddress:
501 case MachineOperand::MO_ExternalSymbol: {
502 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
503 if (!isMemOp) O << '$';
505 printSymbolOperand(MO);
511 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
512 unsigned char value = MI->getOperand(Op).getImm();
513 assert(value <= 7 && "Invalid ssecc argument!");
515 case 0: O << "eq"; break;
516 case 1: O << "lt"; break;
517 case 2: O << "le"; break;
518 case 3: O << "unord"; break;
519 case 4: O << "neq"; break;
520 case 5: O << "nlt"; break;
521 case 6: O << "nle"; break;
522 case 7: O << "ord"; break;
526 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
527 const char *Modifier) {
528 const MachineOperand &BaseReg = MI->getOperand(Op);
529 const MachineOperand &IndexReg = MI->getOperand(Op+2);
530 const MachineOperand &DispSpec = MI->getOperand(Op+3);
532 // If we really don't want to print out (rip), don't.
533 bool HasBaseReg = BaseReg.getReg() != 0;
534 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
535 BaseReg.getReg() == X86::RIP)
538 // HasParenPart - True if we will print out the () part of the mem ref.
539 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
541 if (DispSpec.isImm()) {
542 int DispVal = DispSpec.getImm();
543 if (DispVal || !HasParenPart)
546 assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
547 DispSpec.isJTI() || DispSpec.isSymbol());
548 printOperand(MI, Op+3, "mem");
552 assert(IndexReg.getReg() != X86::ESP &&
553 "X86 doesn't allow scaling by ESP");
557 printOperand(MI, Op, Modifier);
559 if (IndexReg.getReg()) {
561 printOperand(MI, Op+2, Modifier);
562 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
564 O << ',' << ScaleVal;
570 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
571 const char *Modifier) {
572 assert(isMem(MI, Op) && "Invalid memory reference!");
573 const MachineOperand &Segment = MI->getOperand(Op+4);
574 if (Segment.getReg()) {
575 printOperand(MI, Op+4, Modifier);
578 printLeaMemReference(MI, Op, Modifier);
581 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
582 const MachineBasicBlock *MBB) const {
583 if (!TAI->getSetDirective())
586 // We don't need .set machinery if we have GOT-style relocations
587 if (Subtarget->isPICStyleGOT())
590 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
591 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
592 printBasicBlockLabel(MBB, false, false, false);
593 if (Subtarget->isPICStyleRIPRel())
594 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
595 << '_' << uid << '\n';
598 PrintPICBaseSymbol();
604 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
605 PrintPICBaseSymbol();
607 PrintPICBaseSymbol();
612 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
613 const MachineBasicBlock *MBB,
614 unsigned uid) const {
615 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
616 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
618 O << JTEntryDirective << ' ';
620 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
621 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
622 << '_' << uid << "_set_" << MBB->getNumber();
623 } else if (Subtarget->isPICStyleGOT()) {
624 printBasicBlockLabel(MBB, false, false, false);
627 printBasicBlockLabel(MBB, false, false, false);
630 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
631 unsigned Reg = MO.getReg();
633 default: return true; // Unknown mode.
634 case 'b': // Print QImode register
635 Reg = getX86SubSuperRegister(Reg, MVT::i8);
637 case 'h': // Print QImode high register
638 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
640 case 'w': // Print HImode register
641 Reg = getX86SubSuperRegister(Reg, MVT::i16);
643 case 'k': // Print SImode register
644 Reg = getX86SubSuperRegister(Reg, MVT::i32);
646 case 'q': // Print DImode register
647 Reg = getX86SubSuperRegister(Reg, MVT::i64);
651 O << '%'<< TRI->getAsmName(Reg);
655 /// PrintAsmOperand - Print out an operand for an inline asm expression.
657 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
659 const char *ExtraCode) {
660 // Does this asm operand have a single letter operand modifier?
661 if (ExtraCode && ExtraCode[0]) {
662 if (ExtraCode[1] != 0) return true; // Unknown modifier.
664 switch (ExtraCode[0]) {
665 default: return true; // Unknown modifier.
666 case 'c': // Don't print "$" before a global var name or constant.
667 if (MI->getOperand(OpNo).isImm())
668 O << MI->getOperand(OpNo).getImm();
670 printOperand(MI, OpNo, "mem");
673 case 'A': // Print '*' before a register (it must be a register)
674 if (MI->getOperand(OpNo).isReg()) {
676 printOperand(MI, OpNo);
681 case 'b': // Print QImode register
682 case 'h': // Print QImode high register
683 case 'w': // Print HImode register
684 case 'k': // Print SImode register
685 case 'q': // Print DImode register
686 if (MI->getOperand(OpNo).isReg())
687 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
688 printOperand(MI, OpNo);
691 case 'P': // This is the operand of a call, treat specially.
692 print_pcrel_imm(MI, OpNo);
695 case 'n': { // Negate the immediate or print a '-' before the operand.
696 // Note: this is a temporary solution. It should be handled target
697 // independently as part of the 'MC' work.
698 const MachineOperand &MO = MI->getOperand(OpNo);
708 printOperand(MI, OpNo);
712 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
715 const char *ExtraCode) {
716 if (ExtraCode && ExtraCode[0]) {
717 if (ExtraCode[1] != 0) return true; // Unknown modifier.
719 switch (ExtraCode[0]) {
720 default: return true; // Unknown modifier.
721 case 'b': // Print QImode register
722 case 'h': // Print QImode high register
723 case 'w': // Print HImode register
724 case 'k': // Print SImode register
725 case 'q': // Print SImode register
726 // These only apply to registers, ignore on mem.
728 case 'P': // Don't print @PLT, but do print as memory.
729 printMemReference(MI, OpNo, "no-rip");
733 printMemReference(MI, OpNo);
737 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
738 // Convert registers in the addr mode according to subreg64.
739 for (unsigned i = 0; i != 4; ++i) {
740 if (!MI->getOperand(i).isReg()) continue;
742 unsigned Reg = MI->getOperand(i).getReg();
743 if (Reg == 0) continue;
745 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
749 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
750 /// AT&T syntax to the current output stream.
752 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
756 if (MI->getOpcode() == TargetInstrInfo::INLINEASM) {
760 } else if (MI->isLabel()) {
763 } else if (MI->getOpcode() == TargetInstrInfo::DECLARE) {
766 } else if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
767 printImplicitDef(MI);
774 TmpInst.setOpcode(MI->getOpcode());
776 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
777 const MachineOperand &MO = MI->getOperand(i);
781 MCOp.MakeReg(MO.getReg());
782 } else if (MO.isImm()) {
783 MCOp.MakeImm(MO.getImm());
784 } else if (MO.isMBB()) {
785 MCOp.MakeMBBLabel(getFunctionNumber(), MO.getMBB()->getNumber());
787 LLVM_UNREACHABLE( "Unimp");
790 TmpInst.addOperand(MCOp);
793 switch (TmpInst.getOpcode()) {
795 // Handle the 'subreg rewriting' for the lea64_32mem operand.
796 lower_lea64_32mem(&TmpInst, 1);
800 // FIXME: Convert TmpInst.
801 printInstruction(&TmpInst);
805 // Call the autogenerated instruction printer routines.
806 printInstruction(MI);
810 bool X86ATTAsmPrinter::doInitialization(Module &M) {
812 Context = new MCContext();
813 // FIXME: Send this to "O" instead of outs(). For now, we force it to
814 // stdout to make it easy to compare.
815 Streamer = createAsmStreamer(*Context, outs());
818 return AsmPrinter::doInitialization(M);
821 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
822 const TargetData *TD = TM.getTargetData();
824 if (!GVar->hasInitializer())
825 return; // External global require no code
827 // Check to see if this is a special global used by LLVM, if so, emit it.
828 if (EmitSpecialLLVMGlobal(GVar)) {
829 if (Subtarget->isTargetDarwin() &&
830 TM.getRelocationModel() == Reloc::Static) {
831 if (GVar->getName() == "llvm.global_ctors")
832 O << ".reference .constructors_used\n";
833 else if (GVar->getName() == "llvm.global_dtors")
834 O << ".reference .destructors_used\n";
839 std::string name = Mang->getValueName(GVar);
840 Constant *C = GVar->getInitializer();
841 if (isa<MDNode>(C) || isa<MDString>(C))
843 const Type *Type = C->getType();
844 unsigned Size = TD->getTypeAllocSize(Type);
845 unsigned Align = TD->getPreferredAlignmentLog(GVar);
847 printVisibility(name, GVar->getVisibility());
849 if (Subtarget->isTargetELF())
850 O << "\t.type\t" << name << ",@object\n";
852 SwitchToSection(TAI->SectionForGlobal(GVar));
854 if (C->isNullValue() && !GVar->hasSection() &&
855 !(Subtarget->isTargetDarwin() &&
856 TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
857 // FIXME: This seems to be pretty darwin-specific
858 if (GVar->hasExternalLinkage()) {
859 if (const char *Directive = TAI->getZeroFillDirective()) {
860 O << "\t.globl " << name << '\n';
861 O << Directive << "__DATA, __common, " << name << ", "
862 << Size << ", " << Align << '\n';
867 if (!GVar->isThreadLocal() &&
868 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
869 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
871 if (TAI->getLCOMMDirective() != NULL) {
872 if (GVar->hasLocalLinkage()) {
873 O << TAI->getLCOMMDirective() << name << ',' << Size;
874 if (Subtarget->isTargetDarwin())
876 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
877 O << "\t.globl " << name << '\n'
878 << TAI->getWeakDefDirective() << name << '\n';
879 EmitAlignment(Align, GVar);
882 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
883 PrintUnmangledNameSafely(GVar, O);
886 EmitGlobalConstant(C);
889 O << TAI->getCOMMDirective() << name << ',' << Size;
890 if (TAI->getCOMMDirectiveTakesAlignment())
891 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
894 if (!Subtarget->isTargetCygMing()) {
895 if (GVar->hasLocalLinkage())
896 O << "\t.local\t" << name << '\n';
898 O << TAI->getCOMMDirective() << name << ',' << Size;
899 if (TAI->getCOMMDirectiveTakesAlignment())
900 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
903 O << "\t\t" << TAI->getCommentString() << ' ';
904 PrintUnmangledNameSafely(GVar, O);
911 switch (GVar->getLinkage()) {
912 case GlobalValue::CommonLinkage:
913 case GlobalValue::LinkOnceAnyLinkage:
914 case GlobalValue::LinkOnceODRLinkage:
915 case GlobalValue::WeakAnyLinkage:
916 case GlobalValue::WeakODRLinkage:
917 if (Subtarget->isTargetDarwin()) {
918 O << "\t.globl " << name << '\n'
919 << TAI->getWeakDefDirective() << name << '\n';
920 } else if (Subtarget->isTargetCygMing()) {
921 O << "\t.globl\t" << name << "\n"
922 "\t.linkonce same_size\n";
924 O << "\t.weak\t" << name << '\n';
927 case GlobalValue::DLLExportLinkage:
928 case GlobalValue::AppendingLinkage:
929 // FIXME: appending linkage variables should go into a section of
930 // their name or something. For now, just emit them as external.
931 case GlobalValue::ExternalLinkage:
932 // If external or appending, declare as a global symbol
933 O << "\t.globl " << name << '\n';
935 case GlobalValue::PrivateLinkage:
936 case GlobalValue::InternalLinkage:
939 LLVM_UNREACHABLE( "Unknown linkage type!");
942 EmitAlignment(Align, GVar);
945 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
946 PrintUnmangledNameSafely(GVar, O);
949 if (TAI->hasDotTypeDotSizeDirective())
950 O << "\t.size\t" << name << ", " << Size << '\n';
952 EmitGlobalConstant(C);
955 bool X86ATTAsmPrinter::doFinalization(Module &M) {
956 // Print out module-level global variables here.
957 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
959 printModuleLevelGV(I);
961 if (I->hasDLLExportLinkage())
962 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
965 if (Subtarget->isTargetDarwin()) {
966 SwitchToDataSection("");
968 // Add the (possibly multiple) personalities to the set of global value
969 // stubs. Only referenced functions get into the Personalities list.
970 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
971 const std::vector<Function*> &Personalities = MMI->getPersonalities();
972 for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
973 if (Personalities[i] == 0)
975 std::string Name = Mang->getValueName(Personalities[i]);
976 decorateName(Name, Personalities[i]);
977 GVStubs.insert(Name);
981 // Output stubs for dynamically-linked functions
982 if (!FnStubs.empty()) {
983 for (StringSet<>::iterator I = FnStubs.begin(), E = FnStubs.end();
985 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
986 "self_modifying_code+pure_instructions,5", 0);
987 const char *Name = I->getKeyData();
988 printSuffixedName(Name, "$stub");
990 "\t.indirect_symbol " << Name << "\n"
991 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
996 // Output stubs for external and common global variables.
997 if (!GVStubs.empty()) {
999 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
1000 for (StringSet<>::iterator I = GVStubs.begin(), E = GVStubs.end();
1002 const char *Name = I->getKeyData();
1003 printSuffixedName(Name, "$non_lazy_ptr");
1004 O << ":\n\t.indirect_symbol " << Name << "\n\t.long\t0\n";
1008 if (!HiddenGVStubs.empty()) {
1009 SwitchToSection(TAI->getDataSection());
1011 for (StringSet<>::iterator I = HiddenGVStubs.begin(),
1012 E = HiddenGVStubs.end(); I != E; ++I) {
1013 const char *Name = I->getKeyData();
1014 printSuffixedName(Name, "$non_lazy_ptr");
1015 O << ":\n" << TAI->getData32bitsDirective() << Name << '\n';
1019 // Funny Darwin hack: This flag tells the linker that no global symbols
1020 // contain code that falls through to other global symbols (e.g. the obvious
1021 // implementation of multiple entry points). If this doesn't occur, the
1022 // linker can safely perform dead code stripping. Since LLVM never
1023 // generates code that does this, it is always safe to set.
1024 O << "\t.subsections_via_symbols\n";
1025 } else if (Subtarget->isTargetCygMing()) {
1026 // Emit type information for external functions
1027 for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
1029 O << "\t.def\t " << i->getKeyData()
1030 << ";\t.scl\t" << COFF::C_EXT
1031 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
1037 // Output linker support code for dllexported globals on windows.
1038 if (!DLLExportedGVs.empty()) {
1039 SwitchToDataSection(".section .drectve");
1041 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
1042 e = DLLExportedGVs.end(); i != e; ++i)
1043 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1046 if (!DLLExportedFns.empty()) {
1047 SwitchToDataSection(".section .drectve");
1049 for (StringSet<>::iterator i = DLLExportedFns.begin(),
1050 e = DLLExportedFns.end();
1052 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1055 // Do common shutdown.
1056 bool Changed = AsmPrinter::doFinalization(M);
1058 if (NewAsmPrinter) {
1070 // Include the auto-generated portion of the assembly writer.
1071 #include "X86GenAsmWriter.inc"