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"
18 #include "X86ATTInstPrinter.h"
19 #include "X86MCInstLower.h"
22 #include "X86MachineFunctionInfo.h"
23 #include "X86TargetMachine.h"
24 #include "llvm/CallingConv.h"
25 #include "llvm/DerivedTypes.h"
26 #include "llvm/Module.h"
27 #include "llvm/Type.h"
28 #include "llvm/Assembly/Writer.h"
29 #include "llvm/MC/MCContext.h"
30 #include "llvm/MC/MCSectionMachO.h"
31 #include "llvm/MC/MCStreamer.h"
32 #include "llvm/MC/MCSymbol.h"
33 #include "llvm/CodeGen/MachineJumpTableInfo.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/FormattedStream.h"
36 #include "llvm/Support/Mangler.h"
37 #include "llvm/MC/MCAsmInfo.h"
38 #include "llvm/Target/TargetLoweringObjectFile.h"
39 #include "llvm/Target/TargetOptions.h"
40 #include "llvm/ADT/SmallString.h"
41 #include "llvm/ADT/Statistic.h"
44 STATISTIC(EmittedInsts, "Number of machine instrs printed");
46 //===----------------------------------------------------------------------===//
47 // Primitive Helper Functions.
48 //===----------------------------------------------------------------------===//
50 void X86ATTAsmPrinter::printMCInst(const MCInst *MI) {
51 X86ATTInstPrinter(O, *MAI).printInstruction(MI);
54 void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
55 // FIXME: Gross const cast hack.
56 X86ATTAsmPrinter *AP = const_cast<X86ATTAsmPrinter*>(this);
57 X86MCInstLower(OutContext, 0, *AP).GetPICBaseSymbol()->print(O, MAI);
60 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
61 const TargetData *TD) {
62 X86MachineFunctionInfo Info;
65 switch (F->getCallingConv()) {
66 case CallingConv::X86_StdCall:
67 Info.setDecorationStyle(StdCall);
69 case CallingConv::X86_FastCall:
70 Info.setDecorationStyle(FastCall);
77 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
78 AI != AE; ++AI, ++argNum) {
79 const Type* Ty = AI->getType();
81 // 'Dereference' type in case of byval parameter attribute
82 if (F->paramHasAttr(argNum, Attribute::ByVal))
83 Ty = cast<PointerType>(Ty)->getElementType();
85 // Size should be aligned to DWORD boundary
86 Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
89 // We're not supporting tooooo huge arguments :)
90 Info.setBytesToPopOnReturn((unsigned int)Size);
94 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
95 /// various name decorations for Cygwin and MingW.
96 void X86ATTAsmPrinter::DecorateCygMingName(SmallVectorImpl<char> &Name,
97 const GlobalValue *GV) {
98 assert(Subtarget->isTargetCygMing() && "This is only for cygwin and mingw");
100 const Function *F = dyn_cast<Function>(GV);
103 // Save function name for later type emission.
104 if (F->isDeclaration())
105 CygMingStubs.insert(StringRef(Name.data(), Name.size()));
107 // We don't want to decorate non-stdcall or non-fastcall functions right now
108 CallingConv::ID CC = F->getCallingConv();
109 if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
113 const X86MachineFunctionInfo *Info;
115 FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
116 if (info_item == FunctionInfoMap.end()) {
117 // Calculate apropriate function info and populate map
118 FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
119 Info = &FunctionInfoMap[F];
121 Info = &info_item->second;
124 if (Info->getDecorationStyle() == None) return;
125 const FunctionType *FT = F->getFunctionType();
127 // "Pure" variadic functions do not receive @0 suffix.
128 if (!FT->isVarArg() || FT->getNumParams() == 0 ||
129 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
130 raw_svector_ostream(Name) << '@' << Info->getBytesToPopOnReturn();
132 if (Info->getDecorationStyle() == FastCall) {
136 Name.insert(Name.begin(), '@');
140 /// DecorateCygMingName - Query FunctionInfoMap and use this information for
141 /// various name decorations for Cygwin and MingW.
142 void X86ATTAsmPrinter::DecorateCygMingName(std::string &Name,
143 const GlobalValue *GV) {
144 SmallString<128> NameStr(Name.begin(), Name.end());
145 DecorateCygMingName(NameStr, GV);
146 Name.assign(NameStr.begin(), NameStr.end());
149 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
150 unsigned FnAlign = MF.getAlignment();
151 const Function *F = MF.getFunction();
153 if (Subtarget->isTargetCygMing())
154 DecorateCygMingName(CurrentFnName, F);
156 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
157 EmitAlignment(FnAlign, F);
159 switch (F->getLinkage()) {
160 default: llvm_unreachable("Unknown linkage type!");
161 case Function::InternalLinkage: // Symbols default to internal.
162 case Function::PrivateLinkage:
164 case Function::DLLExportLinkage:
165 case Function::ExternalLinkage:
166 O << "\t.globl\t" << CurrentFnName << '\n';
168 case Function::LinkerPrivateLinkage:
169 case Function::LinkOnceAnyLinkage:
170 case Function::LinkOnceODRLinkage:
171 case Function::WeakAnyLinkage:
172 case Function::WeakODRLinkage:
173 if (Subtarget->isTargetDarwin()) {
174 O << "\t.globl\t" << CurrentFnName << '\n';
175 O << MAI->getWeakDefDirective() << CurrentFnName << '\n';
176 } else if (Subtarget->isTargetCygMing()) {
177 O << "\t.globl\t" << CurrentFnName << "\n"
178 "\t.linkonce discard\n";
180 O << "\t.weak\t" << CurrentFnName << '\n';
185 printVisibility(CurrentFnName, F->getVisibility());
187 if (Subtarget->isTargetELF())
188 O << "\t.type\t" << CurrentFnName << ",@function\n";
189 else if (Subtarget->isTargetCygMing()) {
190 O << "\t.def\t " << CurrentFnName
192 (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
193 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
197 O << CurrentFnName << ':';
199 O.PadToColumn(MAI->getCommentColumn());
200 O << MAI->getCommentString() << ' ';
201 WriteAsOperand(O, F, /*PrintType=*/false, F->getParent());
205 // Add some workaround for linkonce linkage on Cygwin\MinGW
206 if (Subtarget->isTargetCygMing() &&
207 (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
208 O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
211 /// runOnMachineFunction - This uses the printMachineInstruction()
212 /// method to print assembly for each instruction.
214 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
215 const Function *F = MF.getFunction();
217 CallingConv::ID CC = F->getCallingConv();
219 SetupMachineFunction(MF);
222 // Populate function information map. Actually, We don't want to populate
223 // non-stdcall or non-fastcall functions' information right now.
224 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
225 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
227 // Print out constants referenced by the function
228 EmitConstantPool(MF.getConstantPool());
230 if (F->hasDLLExportLinkage())
231 DLLExportedFns.insert(Mang->getMangledName(F));
233 // Print the 'header' of function
234 emitFunctionHeader(MF);
236 // Emit pre-function debug and/or EH information.
237 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
238 DW->BeginFunction(&MF);
240 // Print out code for the function.
241 bool hasAnyRealCode = false;
242 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
244 // Print a label for the basic block.
245 if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
246 // This is an entry block or a block that's only reachable via a
247 // fallthrough edge. In non-VerboseAsm mode, don't print the label.
249 EmitBasicBlockStart(I);
252 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
254 // Print the assembly for the instruction.
256 hasAnyRealCode = true;
257 printMachineInstruction(II);
261 if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
262 // If the function is empty, then we need to emit *something*. Otherwise,
263 // the function's label might be associated with something that it wasn't
264 // meant to be associated with. We emit a noop in this situation.
265 // We are assuming inline asms are code.
269 if (MAI->hasDotTypeDotSizeDirective())
270 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
272 // Emit post-function debug information.
273 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
274 DW->EndFunction(&MF);
276 // Print out jump tables referenced by the function.
277 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
279 // We didn't modify anything.
283 /// printSymbolOperand - Print a raw symbol reference operand. This handles
284 /// jump tables, constant pools, global address and external symbols, all of
285 /// which print to a label with various suffixes for relocation types etc.
286 void X86ATTAsmPrinter::printSymbolOperand(const MachineOperand &MO) {
287 switch (MO.getType()) {
288 default: llvm_unreachable("unknown symbol type!");
289 case MachineOperand::MO_JumpTableIndex:
290 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
293 case MachineOperand::MO_ConstantPoolIndex:
294 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
296 printOffset(MO.getOffset());
298 case MachineOperand::MO_GlobalAddress: {
299 const GlobalValue *GV = MO.getGlobal();
301 const char *Suffix = "";
302 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB)
304 else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
305 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
306 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
307 Suffix = "$non_lazy_ptr";
309 std::string Name = Mang->getMangledName(GV, Suffix, Suffix[0] != '\0');
310 if (Subtarget->isTargetCygMing())
311 DecorateCygMingName(Name, GV);
313 // Handle dllimport linkage.
314 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
315 Name = "__imp_" + Name;
317 if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
318 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
319 SmallString<128> NameStr;
320 Mang->getNameWithPrefix(NameStr, GV, true);
321 NameStr += "$non_lazy_ptr";
322 MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
323 MCSymbol *&StubSym = GVStubs[Sym];
326 Mang->getNameWithPrefix(NameStr, GV, false);
327 StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
329 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
330 SmallString<128> NameStr;
331 Mang->getNameWithPrefix(NameStr, GV, true);
332 NameStr += "$non_lazy_ptr";
333 MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
334 MCSymbol *&StubSym = HiddenGVStubs[Sym];
337 Mang->getNameWithPrefix(NameStr, GV, false);
338 StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
340 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
341 SmallString<128> NameStr;
342 Mang->getNameWithPrefix(NameStr, GV, true);
344 MCSymbol *Sym = OutContext.GetOrCreateSymbol(NameStr.str());
345 MCSymbol *&StubSym = FnStubs[Sym];
348 Mang->getNameWithPrefix(NameStr, GV, false);
349 StubSym = OutContext.GetOrCreateSymbol(NameStr.str());
353 // If the name begins with a dollar-sign, enclose it in parens. We do this
354 // to avoid having it look like an integer immediate to the assembler.
356 O << '(' << Name << ')';
360 printOffset(MO.getOffset());
363 case MachineOperand::MO_ExternalSymbol: {
364 std::string Name = Mang->makeNameProper(MO.getSymbolName());
365 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
367 MCSymbol *&StubSym = FnStubs[OutContext.GetOrCreateSymbol(Name)];
369 Name.erase(Name.end()-5, Name.end());
370 StubSym = OutContext.GetOrCreateSymbol(Name);
374 // If the name begins with a dollar-sign, enclose it in parens. We do this
375 // to avoid having it look like an integer immediate to the assembler.
377 O << '(' << Name << ')';
384 switch (MO.getTargetFlags()) {
386 llvm_unreachable("Unknown target flag on GV operand");
387 case X86II::MO_NO_FLAG: // No flag.
389 case X86II::MO_DARWIN_NONLAZY:
390 case X86II::MO_DLLIMPORT:
391 case X86II::MO_DARWIN_STUB:
392 // These affect the name of the symbol, not any suffix.
394 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
396 PrintPICBaseSymbol();
399 case X86II::MO_PIC_BASE_OFFSET:
400 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
401 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
403 PrintPICBaseSymbol();
405 case X86II::MO_TLSGD: O << "@TLSGD"; break;
406 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
407 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
408 case X86II::MO_TPOFF: O << "@TPOFF"; break;
409 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
410 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
411 case X86II::MO_GOT: O << "@GOT"; break;
412 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
413 case X86II::MO_PLT: O << "@PLT"; break;
417 /// print_pcrel_imm - This is used to print an immediate value that ends up
418 /// being encoded as a pc-relative value. These print slightly differently, for
419 /// example, a $ is not emitted.
420 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
421 const MachineOperand &MO = MI->getOperand(OpNo);
422 switch (MO.getType()) {
423 default: llvm_unreachable("Unknown pcrel immediate operand");
424 case MachineOperand::MO_Immediate:
427 case MachineOperand::MO_MachineBasicBlock:
428 GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
430 case MachineOperand::MO_GlobalAddress:
431 case MachineOperand::MO_ExternalSymbol:
432 printSymbolOperand(MO);
438 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
439 const char *Modifier) {
440 const MachineOperand &MO = MI->getOperand(OpNo);
441 switch (MO.getType()) {
442 default: llvm_unreachable("unknown operand type!");
443 case MachineOperand::MO_Register: {
445 unsigned Reg = MO.getReg();
446 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
447 EVT VT = (strcmp(Modifier+6,"64") == 0) ?
448 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
449 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
450 Reg = getX86SubSuperRegister(Reg, VT);
452 O << X86ATTInstPrinter::getRegisterName(Reg);
456 case MachineOperand::MO_Immediate:
457 O << '$' << MO.getImm();
460 case MachineOperand::MO_JumpTableIndex:
461 case MachineOperand::MO_ConstantPoolIndex:
462 case MachineOperand::MO_GlobalAddress:
463 case MachineOperand::MO_ExternalSymbol: {
465 printSymbolOperand(MO);
471 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
472 unsigned char value = MI->getOperand(Op).getImm();
473 assert(value <= 7 && "Invalid ssecc argument!");
475 case 0: O << "eq"; break;
476 case 1: O << "lt"; break;
477 case 2: O << "le"; break;
478 case 3: O << "unord"; break;
479 case 4: O << "neq"; break;
480 case 5: O << "nlt"; break;
481 case 6: O << "nle"; break;
482 case 7: O << "ord"; break;
486 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
487 const char *Modifier) {
488 const MachineOperand &BaseReg = MI->getOperand(Op);
489 const MachineOperand &IndexReg = MI->getOperand(Op+2);
490 const MachineOperand &DispSpec = MI->getOperand(Op+3);
492 // If we really don't want to print out (rip), don't.
493 bool HasBaseReg = BaseReg.getReg() != 0;
494 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
495 BaseReg.getReg() == X86::RIP)
498 // HasParenPart - True if we will print out the () part of the mem ref.
499 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
501 if (DispSpec.isImm()) {
502 int DispVal = DispSpec.getImm();
503 if (DispVal || !HasParenPart)
506 assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
507 DispSpec.isJTI() || DispSpec.isSymbol());
508 printSymbolOperand(MI->getOperand(Op+3));
512 assert(IndexReg.getReg() != X86::ESP &&
513 "X86 doesn't allow scaling by ESP");
517 printOperand(MI, Op, Modifier);
519 if (IndexReg.getReg()) {
521 printOperand(MI, Op+2, Modifier);
522 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
524 O << ',' << ScaleVal;
530 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
531 const char *Modifier) {
532 assert(isMem(MI, Op) && "Invalid memory reference!");
533 const MachineOperand &Segment = MI->getOperand(Op+4);
534 if (Segment.getReg()) {
535 printOperand(MI, Op+4, Modifier);
538 printLeaMemReference(MI, Op, Modifier);
541 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
542 const MachineBasicBlock *MBB) const {
543 if (!MAI->getSetDirective())
546 // We don't need .set machinery if we have GOT-style relocations
547 if (Subtarget->isPICStyleGOT())
550 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
551 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
553 GetMBBSymbol(MBB->getNumber())->print(O, MAI);
555 if (Subtarget->isPICStyleRIPRel())
556 O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
557 << '_' << uid << '\n';
560 PrintPICBaseSymbol();
566 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
567 PrintPICBaseSymbol();
569 PrintPICBaseSymbol();
573 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
574 const MachineBasicBlock *MBB,
575 unsigned uid) const {
576 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
577 MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
579 O << JTEntryDirective << ' ';
581 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC()) {
582 O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
583 << '_' << uid << "_set_" << MBB->getNumber();
584 } else if (Subtarget->isPICStyleGOT()) {
585 GetMBBSymbol(MBB->getNumber())->print(O, MAI);
588 GetMBBSymbol(MBB->getNumber())->print(O, MAI);
591 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
592 unsigned Reg = MO.getReg();
594 default: return true; // Unknown mode.
595 case 'b': // Print QImode register
596 Reg = getX86SubSuperRegister(Reg, MVT::i8);
598 case 'h': // Print QImode high register
599 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
601 case 'w': // Print HImode register
602 Reg = getX86SubSuperRegister(Reg, MVT::i16);
604 case 'k': // Print SImode register
605 Reg = getX86SubSuperRegister(Reg, MVT::i32);
607 case 'q': // Print DImode register
608 Reg = getX86SubSuperRegister(Reg, MVT::i64);
612 O << '%' << X86ATTInstPrinter::getRegisterName(Reg);
616 /// PrintAsmOperand - Print out an operand for an inline asm expression.
618 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
620 const char *ExtraCode) {
621 // Does this asm operand have a single letter operand modifier?
622 if (ExtraCode && ExtraCode[0]) {
623 if (ExtraCode[1] != 0) return true; // Unknown modifier.
625 const MachineOperand &MO = MI->getOperand(OpNo);
627 switch (ExtraCode[0]) {
628 default: return true; // Unknown modifier.
629 case 'a': // This is an address. Currently only 'i' and 'r' are expected.
634 if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol()) {
635 printSymbolOperand(MO);
640 printOperand(MI, OpNo);
646 case 'c': // Don't print "$" before a global var name or constant.
649 else if (MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isSymbol())
650 printSymbolOperand(MO);
652 printOperand(MI, OpNo);
655 case 'A': // Print '*' before a register (it must be a register)
658 printOperand(MI, OpNo);
663 case 'b': // Print QImode register
664 case 'h': // Print QImode high register
665 case 'w': // Print HImode register
666 case 'k': // Print SImode register
667 case 'q': // Print DImode register
669 return printAsmMRegister(MO, ExtraCode[0]);
670 printOperand(MI, OpNo);
673 case 'P': // This is the operand of a call, treat specially.
674 print_pcrel_imm(MI, OpNo);
677 case 'n': // Negate the immediate or print a '-' before the operand.
678 // Note: this is a temporary solution. It should be handled target
679 // independently as part of the 'MC' work.
688 printOperand(MI, OpNo);
692 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
695 const char *ExtraCode) {
696 if (ExtraCode && ExtraCode[0]) {
697 if (ExtraCode[1] != 0) return true; // Unknown modifier.
699 switch (ExtraCode[0]) {
700 default: return true; // Unknown modifier.
701 case 'b': // Print QImode register
702 case 'h': // Print QImode high register
703 case 'w': // Print HImode register
704 case 'k': // Print SImode register
705 case 'q': // Print SImode register
706 // These only apply to registers, ignore on mem.
708 case 'P': // Don't print @PLT, but do print as memory.
709 printMemReference(MI, OpNo, "no-rip");
713 printMemReference(MI, OpNo);
719 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
720 /// AT&T syntax to the current output stream.
722 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
725 processDebugLoc(MI->getDebugLoc());
727 printInstructionThroughMCStreamer(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 static int SortSymbolPair(const void *LHS, const void *RHS) {
876 MCSymbol *LHSS = ((const std::pair<MCSymbol*, MCSymbol*>*)LHS)->first;
877 MCSymbol *RHSS = ((const std::pair<MCSymbol*, MCSymbol*>*)RHS)->first;
878 return LHSS->getName().compare(RHSS->getName());
881 /// GetSortedStubs - Return the entries from a DenseMap in a deterministic
883 static std::vector<std::pair<MCSymbol*, MCSymbol*> >
884 GetSortedStubs(const DenseMap<MCSymbol*, MCSymbol*> &Map) {
885 assert(!Map.empty());
886 std::vector<std::pair<MCSymbol*, MCSymbol*> > List(Map.begin(), Map.end());
887 qsort(&List[0], List.size(), sizeof(List[0]), SortSymbolPair);
891 bool X86ATTAsmPrinter::doFinalization(Module &M) {
892 if (Subtarget->isTargetDarwin()) {
893 // All darwin targets use mach-o.
894 TargetLoweringObjectFileMachO &TLOFMacho =
895 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
897 // Add the (possibly multiple) personalities to the set of global value
898 // stubs. Only referenced functions get into the Personalities list.
899 if (!Subtarget->is64Bit()) {
900 const std::vector<Function*> &Personalities = MMI->getPersonalities();
901 for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
902 if (Personalities[i] == 0)
905 SmallString<128> Name;
906 Mang->getNameWithPrefix(Name, Personalities[i], true /*private label*/);
907 Name += "$non_lazy_ptr";
908 MCSymbol *NLPName = OutContext.GetOrCreateSymbol(Name.str());
910 MCSymbol *&StubName = GVStubs[NLPName];
911 if (StubName != 0) continue;
915 Mang->getNameWithPrefix(Name, Personalities[i], false);
916 StubName = OutContext.GetOrCreateSymbol(Name.str());
920 // Output stubs for dynamically-linked functions
921 if (!FnStubs.empty()) {
922 const MCSection *TheSection =
923 TLOFMacho.getMachOSection("__IMPORT", "__jump_table",
924 MCSectionMachO::S_SYMBOL_STUBS |
925 MCSectionMachO::S_ATTR_SELF_MODIFYING_CODE |
926 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
927 5, SectionKind::getMetadata());
928 OutStreamer.SwitchSection(TheSection);
930 std::vector<std::pair<MCSymbol*, MCSymbol*> > Stubs
931 = GetSortedStubs(FnStubs);
932 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
933 Stubs[i].first->print(O, MAI);
934 O << ":\n" << "\t.indirect_symbol ";
935 // Get the MCSymbol without the $stub suffix.
936 Stubs[i].second->print(O, MAI);
937 O << "\n\thlt ; hlt ; hlt ; hlt ; hlt\n";
942 // Output stubs for external and common global variables.
943 if (!GVStubs.empty()) {
944 const MCSection *TheSection =
945 TLOFMacho.getMachOSection("__IMPORT", "__pointers",
946 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
947 SectionKind::getMetadata());
948 OutStreamer.SwitchSection(TheSection);
950 std::vector<std::pair<MCSymbol*, MCSymbol*> > Stubs
951 = GetSortedStubs(GVStubs);
952 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
953 Stubs[i].first->print(O, MAI);
954 O << ":\n\t.indirect_symbol ";
955 Stubs[i].second->print(O, MAI);
956 O << "\n\t.long\t0\n";
960 if (!HiddenGVStubs.empty()) {
961 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
964 std::vector<std::pair<MCSymbol*, MCSymbol*> > Stubs
965 = GetSortedStubs(HiddenGVStubs);
966 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
967 Stubs[i].first->print(O, MAI);
968 O << ":\n" << MAI->getData32bitsDirective();
969 Stubs[i].second->print(O, MAI);
974 // Funny Darwin hack: This flag tells the linker that no global symbols
975 // contain code that falls through to other global symbols (e.g. the obvious
976 // implementation of multiple entry points). If this doesn't occur, the
977 // linker can safely perform dead code stripping. Since LLVM never
978 // generates code that does this, it is always safe to set.
979 O << "\t.subsections_via_symbols\n";
982 if (Subtarget->isTargetCOFF()) {
983 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
985 if (I->hasDLLExportLinkage())
986 DLLExportedGVs.insert(Mang->getMangledName(I));
988 if (Subtarget->isTargetCygMing()) {
989 // Emit type information for external functions
990 for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
992 O << "\t.def\t " << i->getKeyData()
993 << ";\t.scl\t" << COFF::C_EXT
994 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
999 // Output linker support code for dllexported globals on windows.
1000 if (!DLLExportedGVs.empty() || !DLLExportedFns.empty()) {
1001 // dllexport symbols only exist on coff targets.
1002 TargetLoweringObjectFileCOFF &TLOFCOFF =
1003 static_cast<TargetLoweringObjectFileCOFF&>(getObjFileLowering());
1005 OutStreamer.SwitchSection(TLOFCOFF.getCOFFSection(".section .drectve",
1007 SectionKind::getMetadata()));
1009 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
1010 e = DLLExportedGVs.end(); i != e; ++i)
1011 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1013 for (StringSet<>::iterator i = DLLExportedFns.begin(),
1014 e = DLLExportedFns.end();
1016 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1020 // Do common shutdown.
1021 return AsmPrinter::doFinalization(M);