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 "llvm/CallingConv.h"
23 #include "llvm/DerivedTypes.h"
24 #include "llvm/Module.h"
25 #include "llvm/Type.h"
26 #include "llvm/Assembly/Writer.h"
27 #include "llvm/MC/MCContext.h"
28 #include "llvm/MC/MCSectionMachO.h"
29 #include "llvm/MC/MCStreamer.h"
30 #include "llvm/MC/MCSymbol.h"
31 #include "llvm/CodeGen/MachineJumpTableInfo.h"
32 #include "llvm/Support/CommandLine.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/Support/FormattedStream.h"
35 #include "llvm/Support/Mangler.h"
36 #include "llvm/MC/MCAsmInfo.h"
37 #include "llvm/Target/TargetLoweringObjectFile.h"
38 #include "llvm/Target/TargetOptions.h"
39 #include "llvm/ADT/SmallString.h"
40 #include "llvm/ADT/Statistic.h"
43 STATISTIC(EmittedInsts, "Number of machine instrs printed");
45 static cl::opt<bool> NewAsmPrinter("experimental-asm-printer",
46 cl::Hidden, cl::init(false));
48 //===----------------------------------------------------------------------===//
49 // Primitive Helper Functions.
50 //===----------------------------------------------------------------------===//
52 void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
53 // FIXME: the actual label generated doesn't matter here! Just mangle in
54 // something unique (the function number) with Private prefix.
55 if (Subtarget->isTargetDarwin())
56 O << "\"L" << getFunctionNumber() << "$pb\"";
58 assert(Subtarget->isTargetELF() && "Don't know how to print PIC label!");
59 O << ".Lllvm$" << getFunctionNumber() << ".$piclabel";
63 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
64 const TargetData *TD) {
65 X86MachineFunctionInfo Info;
68 switch (F->getCallingConv()) {
69 case CallingConv::X86_StdCall:
70 Info.setDecorationStyle(StdCall);
72 case CallingConv::X86_FastCall:
73 Info.setDecorationStyle(FastCall);
80 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
81 AI != AE; ++AI, ++argNum) {
82 const Type* Ty = AI->getType();
84 // 'Dereference' type in case of byval parameter attribute
85 if (F->paramHasAttr(argNum, Attribute::ByVal))
86 Ty = cast<PointerType>(Ty)->getElementType();
88 // Size should be aligned to DWORD boundary
89 Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
92 // We're not supporting tooooo huge arguments :)
93 Info.setBytesToPopOnReturn((unsigned int)Size);
97 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
98 /// various name decorations for Cygwin and MingW.
99 void X86ATTAsmPrinter::DecorateCygMingName(SmallVectorImpl<char> &Name,
100 const GlobalValue *GV) {
101 assert(Subtarget->isTargetCygMing() && "This is only for cygwin and mingw");
103 const Function *F = dyn_cast<Function>(GV);
106 // Save function name for later type emission.
107 if (F->isDeclaration())
108 CygMingStubs.insert(StringRef(Name.data(), Name.size()));
110 // We don't want to decorate non-stdcall or non-fastcall functions right now
111 CallingConv::ID CC = F->getCallingConv();
112 if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
116 const X86MachineFunctionInfo *Info;
118 FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
119 if (info_item == FunctionInfoMap.end()) {
120 // Calculate apropriate function info and populate map
121 FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
122 Info = &FunctionInfoMap[F];
124 Info = &info_item->second;
127 if (Info->getDecorationStyle() == None) return;
128 const FunctionType *FT = F->getFunctionType();
130 // "Pure" variadic functions do not receive @0 suffix.
131 if (!FT->isVarArg() || FT->getNumParams() == 0 ||
132 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
133 raw_svector_ostream(Name) << '@' << Info->getBytesToPopOnReturn();
135 if (Info->getDecorationStyle() == FastCall) {
139 Name.insert(Name.begin(), '@');
143 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
144 /// various name decorations for Cygwin and MingW.
145 void X86ATTAsmPrinter::DecorateCygMingName(std::string &Name,
146 const GlobalValue *GV) {
147 SmallString<128> NameStr(Name.begin(), Name.end());
148 DecorateCygMingName(NameStr, GV);
149 Name.assign(NameStr.begin(), NameStr.end());
152 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
153 unsigned FnAlign = MF.getAlignment();
154 const Function *F = MF.getFunction();
156 if (Subtarget->isTargetCygMing())
157 DecorateCygMingName(CurrentFnName, F);
159 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
160 EmitAlignment(FnAlign, F);
162 switch (F->getLinkage()) {
163 default: llvm_unreachable("Unknown linkage type!");
164 case Function::InternalLinkage: // Symbols default to internal.
165 case Function::PrivateLinkage:
167 case Function::DLLExportLinkage:
168 case Function::ExternalLinkage:
169 O << "\t.globl\t" << CurrentFnName << '\n';
171 case Function::LinkerPrivateLinkage:
172 case Function::LinkOnceAnyLinkage:
173 case Function::LinkOnceODRLinkage:
174 case Function::WeakAnyLinkage:
175 case Function::WeakODRLinkage:
176 if (Subtarget->isTargetDarwin()) {
177 O << "\t.globl\t" << CurrentFnName << '\n';
178 O << MAI->getWeakDefDirective() << CurrentFnName << '\n';
179 } else if (Subtarget->isTargetCygMing()) {
180 O << "\t.globl\t" << CurrentFnName << "\n"
181 "\t.linkonce discard\n";
183 O << "\t.weak\t" << CurrentFnName << '\n';
188 printVisibility(CurrentFnName, F->getVisibility());
190 if (Subtarget->isTargetELF())
191 O << "\t.type\t" << CurrentFnName << ",@function\n";
192 else if (Subtarget->isTargetCygMing()) {
193 O << "\t.def\t " << CurrentFnName
195 (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
196 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
200 O << CurrentFnName << ':';
202 O.PadToColumn(MAI->getCommentColumn());
203 O << MAI->getCommentString() << ' ';
204 WriteAsOperand(O, F, /*PrintType=*/false, F->getParent());
208 // Add some workaround for linkonce linkage on Cygwin\MinGW
209 if (Subtarget->isTargetCygMing() &&
210 (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
211 O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
214 /// runOnMachineFunction - This uses the printMachineInstruction()
215 /// method to print assembly for each instruction.
217 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
218 const Function *F = MF.getFunction();
220 CallingConv::ID CC = F->getCallingConv();
222 SetupMachineFunction(MF);
225 // Populate function information map. Actually, We don't want to populate
226 // non-stdcall or non-fastcall functions' information right now.
227 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
228 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
230 // Print out constants referenced by the function
231 EmitConstantPool(MF.getConstantPool());
233 if (F->hasDLLExportLinkage())
234 DLLExportedFns.insert(Mang->getMangledName(F));
236 // Print the 'header' of function
237 emitFunctionHeader(MF);
239 // Emit pre-function debug and/or EH information.
240 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
241 DW->BeginFunction(&MF);
243 // Print out code for the function.
244 bool hasAnyRealCode = false;
245 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
247 // Print a label for the basic block.
248 if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
249 // This is an entry block or a block that's only reachable via a
250 // fallthrough edge. In non-VerboseAsm mode, don't print the label.
252 printBasicBlockLabel(I, true, true, VerboseAsm);
255 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
257 // Print the assembly for the instruction.
259 hasAnyRealCode = true;
260 printMachineInstruction(II);
264 if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
265 // If the function is empty, then we need to emit *something*. Otherwise,
266 // the function's label might be associated with something that it wasn't
267 // meant to be associated with. We emit a noop in this situation.
268 // We are assuming inline asms are code.
272 if (MAI->hasDotTypeDotSizeDirective())
273 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
275 // Emit post-function debug information.
276 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
277 DW->EndFunction(&MF);
279 // Print out jump tables referenced by the function.
280 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
282 // We didn't modify anything.
286 /// printSymbolOperand - Print a raw symbol reference operand. This handles
287 /// jump tables, constant pools, global address and external symbols, all of
288 /// which print to a label with various suffixes for relocation types etc.
289 void X86ATTAsmPrinter::printSymbolOperand(const MachineOperand &MO) {
290 switch (MO.getType()) {
291 default: llvm_unreachable("unknown symbol type!");
292 case MachineOperand::MO_JumpTableIndex:
293 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
296 case MachineOperand::MO_ConstantPoolIndex:
297 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
299 printOffset(MO.getOffset());
301 case MachineOperand::MO_GlobalAddress: {
302 const GlobalValue *GV = MO.getGlobal();
304 const char *Suffix = "";
305 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
307 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
308 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
309 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
310 Suffix = "$non_lazy_ptr";
312 std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
313 if (Subtarget->isTargetCygMing())
314 DecorateCygMingName(Name, GV);
316 // Handle dllimport linkage.
317 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
318 Name = "__imp_" + Name;
320 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
321 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
322 SmallString<128> NameStr;
323 Mang->getNameWithPrefix(NameStr, GV, true);
324 NameStr += "$non_lazy_ptr";
325 MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
326 MCSymbol *&StubSym = GVStubs[Sym];
329 Mang->getNameWithPrefix(NameStr, GV, false);
330 StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
332 } else if (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 SmallString<128> NameStr;
336 Mang->getNameWithPrefix(NameStr, GV, true);
338 MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
339 MCSymbol *&StubSym = FnStubs[Sym];
342 Mang->getNameWithPrefix(NameStr, GV, false);
343 StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
347 // If the name begins with a dollar-sign, enclose it in parens. We do this
348 // to avoid having it look like an integer immediate to the assembler.
350 O << '(' << Name << ')';
354 printOffset(MO.getOffset());
357 case MachineOperand::MO_ExternalSymbol: {
358 std::string Name = Mang->makeNameProper(MO.getSymbolName());
359 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
361 MCSymbol *&StubSym = FnStubs[OutContext.GetOrCreateSymbol(Name)];
363 Name.erase(Name.end()-5, Name.end());
364 StubSym = OutContext.GetOrCreateSymbol(Name);
368 // If the name begins with a dollar-sign, enclose it in parens. We do this
369 // to avoid having it look like an integer immediate to the assembler.
371 O << '(' << Name << ')';
378 switch (MO.getTargetFlags()) {
380 llvm_unreachable("Unknown target flag on GV operand");
381 case X86II::MO_NO_FLAG: // No flag.
383 case X86II::MO_DARWIN_NONLAZY:
384 case X86II::MO_DLLIMPORT:
385 case X86II::MO_DARWIN_STUB:
386 // These affect the name of the symbol, not any suffix.
388 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
390 PrintPICBaseSymbol();
393 case X86II::MO_PIC_BASE_OFFSET:
394 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
395 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
397 PrintPICBaseSymbol();
399 case X86II::MO_TLSGD: O << "@TLSGD"; break;
400 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
401 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
402 case X86II::MO_TPOFF: O << "@TPOFF"; break;
403 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
404 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
405 case X86II::MO_GOT: O << "@GOT"; break;
406 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
407 case X86II::MO_PLT: O << "@PLT"; break;
411 /// print_pcrel_imm - This is used to print an immediate value that ends up
412 /// being encoded as a pc-relative value. These print slightly differently, for
413 /// example, a $ is not emitted.
414 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
415 const MachineOperand &MO = MI->getOperand(OpNo);
416 switch (MO.getType()) {
417 default: llvm_unreachable("Unknown pcrel immediate operand");
418 case MachineOperand::MO_Immediate:
421 case MachineOperand::MO_MachineBasicBlock:
422 printBasicBlockLabel(MO.getMBB(), false, false, false);
424 case MachineOperand::MO_GlobalAddress:
425 case MachineOperand::MO_ExternalSymbol:
426 printSymbolOperand(MO);
433 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
434 const char *Modifier) {
435 const MachineOperand &MO = MI->getOperand(OpNo);
436 switch (MO.getType()) {
437 default: llvm_unreachable("unknown operand type!");
438 case MachineOperand::MO_Register: {
439 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
440 "Virtual registers should not make it this far!");
442 unsigned Reg = MO.getReg();
443 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
444 EVT VT = (strcmp(Modifier+6,"64") == 0) ?
445 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
446 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
447 Reg = getX86SubSuperRegister(Reg, VT);
449 O << TRI->getAsmName(Reg);
453 case MachineOperand::MO_Immediate:
454 O << '$' << MO.getImm();
457 case MachineOperand::MO_JumpTableIndex:
458 case MachineOperand::MO_ConstantPoolIndex:
459 case MachineOperand::MO_GlobalAddress:
460 case MachineOperand::MO_ExternalSymbol: {
462 printSymbolOperand(MO);
468 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
469 unsigned char value = MI->getOperand(Op).getImm();
470 assert(value <= 7 && "Invalid ssecc argument!");
472 case 0: O << "eq"; break;
473 case 1: O << "lt"; break;
474 case 2: O << "le"; break;
475 case 3: O << "unord"; break;
476 case 4: O << "neq"; break;
477 case 5: O << "nlt"; break;
478 case 6: O << "nle"; break;
479 case 7: O << "ord"; break;
483 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
484 const char *Modifier) {
485 const MachineOperand &BaseReg = MI->getOperand(Op);
486 const MachineOperand &IndexReg = MI->getOperand(Op+2);
487 const MachineOperand &DispSpec = MI->getOperand(Op+3);
489 // If we really don't want to print out (rip), don't.
490 bool HasBaseReg = BaseReg.getReg() != 0;
491 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
492 BaseReg.getReg() == X86::RIP)
495 // HasParenPart - True if we will print out the () part of the mem ref.
496 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
498 if (DispSpec.isImm()) {
499 int DispVal = DispSpec.getImm();
500 if (DispVal || !HasParenPart)
503 assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
504 DispSpec.isJTI() || DispSpec.isSymbol());
505 printSymbolOperand(MI->getOperand(Op+3));
509 assert(IndexReg.getReg() != X86::ESP &&
510 "X86 doesn't allow scaling by ESP");
514 printOperand(MI, Op, Modifier);
516 if (IndexReg.getReg()) {
518 printOperand(MI, Op+2, Modifier);
519 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
521 O << ',' << ScaleVal;
527 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
528 const char *Modifier) {
529 assert(isMem(MI, Op) && "Invalid memory reference!");
530 const MachineOperand &Segment = MI->getOperand(Op+4);
531 if (Segment.getReg()) {
532 printOperand(MI, Op+4, Modifier);
535 printLeaMemReference(MI, Op, Modifier);
538 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
539 const MachineBasicBlock *MBB) const {
540 if (!MAI->getSetDirective())
543 // We don't need .set machinery if we have GOT-style relocations
544 if (Subtarget->isPICStyleGOT())
547 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
548 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
549 printBasicBlockLabel(MBB, false, false, false);
550 if (Subtarget->isPICStyleRIPRel())
551 O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
552 << '_' << uid << '\n';
555 PrintPICBaseSymbol();
561 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
562 PrintPICBaseSymbol();
564 PrintPICBaseSymbol();
569 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
570 const MachineBasicBlock *MBB,
571 unsigned uid) const {
572 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
573 MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
575 O << JTEntryDirective << ' ';
577 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
578 O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
579 << '_' << uid << "_set_" << MBB->getNumber();
580 } else if (Subtarget->isPICStyleGOT()) {
581 printBasicBlockLabel(MBB, false, false, false);
584 printBasicBlockLabel(MBB, false, false, false);
587 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
588 unsigned Reg = MO.getReg();
590 default: return true; // Unknown mode.
591 case 'b': // Print QImode register
592 Reg = getX86SubSuperRegister(Reg, MVT::i8);
594 case 'h': // Print QImode high register
595 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
597 case 'w': // Print HImode register
598 Reg = getX86SubSuperRegister(Reg, MVT::i16);
600 case 'k': // Print SImode register
601 Reg = getX86SubSuperRegister(Reg, MVT::i32);
603 case 'q': // Print DImode register
604 Reg = getX86SubSuperRegister(Reg, MVT::i64);
608 O << '%'<< TRI->getAsmName(Reg);
612 /// PrintAsmOperand - Print out an operand for an inline asm expression.
614 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
616 const char *ExtraCode) {
617 // Does this asm operand have a single letter operand modifier?
618 if (ExtraCode && ExtraCode[0]) {
619 if (ExtraCode[1] != 0) return true; // Unknown modifier.
621 const MachineOperand &MO = MI->getOperand(OpNo);
623 switch (ExtraCode[0]) {
624 default: return true; // Unknown modifier.
625 case 'a': // This is an address. Currently only 'i' and 'r' are expected.
630 if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
631 printSymbolOperand(MO);
636 printOperand(MI, OpNo);
642 case 'c': // Don't print "$" before a global var name or constant.
645 else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
646 printSymbolOperand(MO);
648 printOperand(MI, OpNo);
651 case 'A': // Print '*' before a register (it must be a register)
654 printOperand(MI, OpNo);
659 case 'b': // Print QImode register
660 case 'h': // Print QImode high register
661 case 'w': // Print HImode register
662 case 'k': // Print SImode register
663 case 'q': // Print DImode register
665 return printAsmMRegister(MO, ExtraCode[0]);
666 printOperand(MI, OpNo);
669 case 'P': // This is the operand of a call, treat specially.
670 print_pcrel_imm(MI, OpNo);
673 case 'n': // Negate the immediate or print a '-' before the operand.
674 // Note: this is a temporary solution. It should be handled target
675 // independently as part of the 'MC' work.
684 printOperand(MI, OpNo);
688 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
691 const char *ExtraCode) {
692 if (ExtraCode && ExtraCode[0]) {
693 if (ExtraCode[1] != 0) return true; // Unknown modifier.
695 switch (ExtraCode[0]) {
696 default: return true; // Unknown modifier.
697 case 'b': // Print QImode register
698 case 'h': // Print QImode high register
699 case 'w': // Print HImode register
700 case 'k': // Print SImode register
701 case 'q': // Print SImode register
702 // These only apply to registers, ignore on mem.
704 case 'P': // Don't print @PLT, but do print as memory.
705 printMemReference(MI, OpNo, "no-rip");
709 printMemReference(MI, OpNo);
715 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
716 /// AT&T syntax to the current output stream.
718 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
721 processDebugLoc(MI->getDebugLoc());
723 // Call the autogenerated instruction printer routines.
725 printInstructionThroughMCStreamer(MI);
727 printInstruction(MI);
729 if (VerboseAsm && !MI->getDebugLoc().isUnknown())
734 void X86ATTAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
735 const TargetData *TD = TM.getTargetData();
737 if (!GVar->hasInitializer())
738 return; // External global require no code
740 // Check to see if this is a special global used by LLVM, if so, emit it.
741 if (EmitSpecialLLVMGlobal(GVar)) {
742 if (Subtarget->isTargetDarwin() &&
743 TM.getRelocationModel() == Reloc::Static) {
744 if (GVar->getName() == "llvm.global_ctors")
745 O << ".reference .constructors_used\n";
746 else if (GVar->getName() == "llvm.global_dtors")
747 O << ".reference .destructors_used\n";
752 std::string name = Mang->getMangledName(GVar);
753 Constant *C = GVar->getInitializer();
754 const Type *Type = C->getType();
755 unsigned Size = TD->getTypeAllocSize(Type);
756 unsigned Align = TD->getPreferredAlignmentLog(GVar);
758 printVisibility(name, GVar->getVisibility());
760 if (Subtarget->isTargetELF())
761 O << "\t.type\t" << name << ",@object\n";
764 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GVar, TM);
765 const MCSection *TheSection =
766 getObjFileLowering().SectionForGlobal(GVar, GVKind, Mang, TM);
767 OutStreamer.SwitchSection(TheSection);
769 // FIXME: get this stuff from section kind flags.
770 if (C->isNullValue() && !GVar->hasSection() &&
771 // Don't put things that should go in the cstring section into "comm".
772 !TheSection->getKind().isMergeableCString()) {
773 if (GVar->hasExternalLinkage()) {
774 if (const char *Directive = MAI->getZeroFillDirective()) {
775 O << "\t.globl " << name << '\n';
776 O << Directive << "__DATA, __common, " << name << ", "
777 << Size << ", " << Align << '\n';
782 if (!GVar->isThreadLocal() &&
783 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
784 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
786 if (MAI->getLCOMMDirective() != NULL) {
787 if (GVar->hasLocalLinkage()) {
788 O << MAI->getLCOMMDirective() << name << ',' << Size;
789 if (Subtarget->isTargetDarwin())
791 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
792 O << "\t.globl " << name << '\n'
793 << MAI->getWeakDefDirective() << name << '\n';
794 EmitAlignment(Align, GVar);
797 O.PadToColumn(MAI->getCommentColumn());
798 O << MAI->getCommentString() << ' ';
799 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
802 EmitGlobalConstant(C);
805 O << MAI->getCOMMDirective() << name << ',' << Size;
806 if (MAI->getCOMMDirectiveTakesAlignment())
807 O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
810 if (!Subtarget->isTargetCygMing()) {
811 if (GVar->hasLocalLinkage())
812 O << "\t.local\t" << name << '\n';
814 O << MAI->getCOMMDirective() << name << ',' << Size;
815 if (MAI->getCOMMDirectiveTakesAlignment())
816 O << ',' << (MAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
819 O.PadToColumn(MAI->getCommentColumn());
820 O << MAI->getCommentString() << ' ';
821 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
828 switch (GVar->getLinkage()) {
829 case GlobalValue::CommonLinkage:
830 case GlobalValue::LinkOnceAnyLinkage:
831 case GlobalValue::LinkOnceODRLinkage:
832 case GlobalValue::WeakAnyLinkage:
833 case GlobalValue::WeakODRLinkage:
834 case GlobalValue::LinkerPrivateLinkage:
835 if (Subtarget->isTargetDarwin()) {
836 O << "\t.globl " << name << '\n'
837 << MAI->getWeakDefDirective() << name << '\n';
838 } else if (Subtarget->isTargetCygMing()) {
839 O << "\t.globl\t" << name << "\n"
840 "\t.linkonce same_size\n";
842 O << "\t.weak\t" << name << '\n';
845 case GlobalValue::DLLExportLinkage:
846 case GlobalValue::AppendingLinkage:
847 // FIXME: appending linkage variables should go into a section of
848 // their name or something. For now, just emit them as external.
849 case GlobalValue::ExternalLinkage:
850 // If external or appending, declare as a global symbol
851 O << "\t.globl " << name << '\n';
853 case GlobalValue::PrivateLinkage:
854 case GlobalValue::InternalLinkage:
857 llvm_unreachable("Unknown linkage type!");
860 EmitAlignment(Align, GVar);
863 O.PadToColumn(MAI->getCommentColumn());
864 O << MAI->getCommentString() << ' ';
865 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
869 EmitGlobalConstant(C);
871 if (MAI->hasDotTypeDotSizeDirective())
872 O << "\t.size\t" << name << ", " << Size << '\n';
875 bool X86ATTAsmPrinter::doFinalization(Module &M) {
876 // Print out module-level global variables here.
877 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
879 if (I->hasDLLExportLinkage())
880 DLLExportedGVs.insert(Mang->getMangledName(I));
883 if (Subtarget->isTargetDarwin()) {
884 // All darwin targets use mach-o.
885 TargetLoweringObjectFileMachO &TLOFMacho =
886 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
888 // Add the (possibly multiple) personalities to the set of global value
889 // stubs. Only referenced functions get into the Personalities list.
890 if (MAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
891 const std::vector<Function*> &Personalities = MMI->getPersonalities();
892 for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
893 if (Personalities[i] == 0)
896 SmallString<128> Name;
897 Mang->getNameWithPrefix(Name, Personalities[i], true /*private label*/);
898 Name += "$non_lazy_ptr";
899 MCSymbol *NLPName = OutContext.GetOrCreateSymbol(Name.str());
901 MCSymbol *&StubName = GVStubs[NLPName];
902 if (StubName != 0) continue;
906 Mang->getNameWithPrefix(Name, Personalities[i], false);
907 StubName = OutContext.GetOrCreateSymbol(Name.str());
911 // Output stubs for dynamically-linked functions
912 if (!FnStubs.empty()) {
913 const MCSection *TheSection =
914 TLOFMacho.getMachOSection("__IMPORT", "__jump_table",
915 MCSectionMachO::S_SYMBOL_STUBS |
916 MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
917 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
918 5, SectionKind::getMetadata());
919 OutStreamer.SwitchSection(TheSection);
920 // FIXME: This iteration order is unstable!!
921 for (DenseMap<MCSymbol*, MCSymbol*>::iterator I = FnStubs.begin(),
922 E = FnStubs.end(); I != E; ++I) {
923 I->first->print(O, MAI);
924 O << ":\n" << "\t.indirect_symbol ";
925 // Get the MCSymbol without the $stub suffix.
926 I->second->print(O, MAI);
927 O << "\n\thlt ; hlt ; hlt ; hlt ; hlt\n";
932 // Output stubs for external and common global variables.
933 if (!GVStubs.empty()) {
934 const MCSection *TheSection =
935 TLOFMacho.getMachOSection("__IMPORT", "__pointers",
936 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
937 SectionKind::getMetadata());
938 OutStreamer.SwitchSection(TheSection);
939 // FIXME: This iteration order is unstable!!
940 for (DenseMap<MCSymbol*, MCSymbol*>::iterator I = GVStubs.begin(),
941 E = GVStubs.end(); I != E; ++I) {
942 I->first->print(O, MAI);
943 O << ":\n\t.indirect_symbol ";
944 I->second->print(O, MAI);
945 O << "\n\t.long\t0\n";
949 if (!HiddenGVStubs.empty()) {
950 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
952 for (StringMap<std::string>::iterator I = HiddenGVStubs.begin(),
953 E = HiddenGVStubs.end(); I != E; ++I)
954 O << I->getKeyData() << ":\n" << MAI->getData32bitsDirective()
955 << I->second << '\n';
958 // Funny Darwin hack: This flag tells the linker that no global symbols
959 // contain code that falls through to other global symbols (e.g. the obvious
960 // implementation of multiple entry points). If this doesn't occur, the
961 // linker can safely perform dead code stripping. Since LLVM never
962 // generates code that does this, it is always safe to set.
963 O << "\t.subsections_via_symbols\n";
964 } else if (Subtarget->isTargetCygMing()) {
965 // Emit type information for external functions
966 for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
968 O << "\t.def\t " << i->getKeyData()
969 << ";\t.scl\t" << COFF::C_EXT
970 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
976 // Output linker support code for dllexported globals on windows.
977 if (!DLLExportedGVs.empty() || !DLLExportedFns.empty()) {
978 // dllexport symbols only exist on coff targets.
979 TargetLoweringObjectFileCOFF &TLOFMacho =
980 static_cast<TargetLoweringObjectFileCOFF&>(getObjFileLowering());
982 OutStreamer.SwitchSection(TLOFMacho.getCOFFSection(".section .drectve",true,
983 SectionKind::getMetadata()));
985 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
986 e = DLLExportedGVs.end(); i != e; ++i)
987 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
989 for (StringSet<>::iterator i = DLLExportedFns.begin(),
990 e = DLLExportedFns.end();
992 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
995 // Do common shutdown.
996 return AsmPrinter::doFinalization(M);
999 // Include the auto-generated portion of the assembly writer.
1000 #include "X86GenAsmWriter.inc"