1 //===-- X86ATTAsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly -----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to AT&T format assembly
12 // language. This printer is the output mechanism used by `llc'.
14 //===----------------------------------------------------------------------===//
16 #define DEBUG_TYPE "asm-printer"
17 #include "X86ATTAsmPrinter.h"
20 #include "X86MachineFunctionInfo.h"
21 #include "X86TargetMachine.h"
22 #include "X86TargetAsmInfo.h"
23 #include "llvm/CallingConv.h"
24 #include "llvm/DerivedTypes.h"
25 #include "llvm/Module.h"
26 #include "llvm/MDNode.h"
27 #include "llvm/Type.h"
28 #include "llvm/ADT/Statistic.h"
29 #include "llvm/ADT/StringExtras.h"
30 #include "llvm/MC/MCContext.h"
31 #include "llvm/MC/MCInst.h"
32 #include "llvm/MC/MCStreamer.h"
33 #include "llvm/CodeGen/DwarfWriter.h"
34 #include "llvm/CodeGen/MachineJumpTableInfo.h"
35 #include "llvm/Support/CommandLine.h"
36 #include "llvm/Support/Mangler.h"
37 #include "llvm/Support/raw_ostream.h"
38 #include "llvm/Target/TargetAsmInfo.h"
39 #include "llvm/Target/TargetOptions.h"
42 STATISTIC(EmittedInsts, "Number of machine instrs printed");
44 static cl::opt<bool> NewAsmPrinter("experimental-asm-printer",
47 //===----------------------------------------------------------------------===//
48 // Primitive Helper Functions.
49 //===----------------------------------------------------------------------===//
51 void X86ATTAsmPrinter::PrintPICBaseSymbol() const {
52 if (Subtarget->isTargetDarwin())
53 O << "\"L" << getFunctionNumber() << "$pb\"";
54 else if (Subtarget->isTargetELF())
55 O << ".Lllvm$" << getFunctionNumber() << ".$piclabel";
57 assert(0 && "Don't know how to print PIC label!\n");
60 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
61 /// Don't print things like \\n or \\0.
62 static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
63 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
69 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
70 const TargetData *TD) {
71 X86MachineFunctionInfo Info;
74 switch (F->getCallingConv()) {
75 case CallingConv::X86_StdCall:
76 Info.setDecorationStyle(StdCall);
78 case CallingConv::X86_FastCall:
79 Info.setDecorationStyle(FastCall);
86 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
87 AI != AE; ++AI, ++argNum) {
88 const Type* Ty = AI->getType();
90 // 'Dereference' type in case of byval parameter attribute
91 if (F->paramHasAttr(argNum, Attribute::ByVal))
92 Ty = cast<PointerType>(Ty)->getElementType();
94 // Size should be aligned to DWORD boundary
95 Size += ((TD->getTypeAllocSize(Ty) + 3)/4)*4;
98 // We're not supporting tooooo huge arguments :)
99 Info.setBytesToPopOnReturn((unsigned int)Size);
103 /// decorateName - Query FunctionInfoMap and use this information for various
105 void X86ATTAsmPrinter::decorateName(std::string &Name,
106 const GlobalValue *GV) {
107 const Function *F = dyn_cast<Function>(GV);
110 // We don't want to decorate non-stdcall or non-fastcall functions right now
111 unsigned CC = F->getCallingConv();
112 if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
115 // Decorate names only when we're targeting Cygwin/Mingw32 targets
116 if (!Subtarget->isTargetCygMing())
119 FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
121 const X86MachineFunctionInfo *Info;
122 if (info_item == FunctionInfoMap.end()) {
123 // Calculate apropriate function info and populate map
124 FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
125 Info = &FunctionInfoMap[F];
127 Info = &info_item->second;
130 const FunctionType *FT = F->getFunctionType();
131 switch (Info->getDecorationStyle()) {
135 // "Pure" variadic functions do not receive @0 suffix.
136 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
137 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
138 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
141 // "Pure" variadic functions do not receive @0 suffix.
142 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
143 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
144 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
146 if (Name[0] == '_') {
153 assert(0 && "Unsupported DecorationStyle");
157 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
158 unsigned FnAlign = MF.getAlignment();
159 const Function *F = MF.getFunction();
161 decorateName(CurrentFnName, F);
163 SwitchToSection(TAI->SectionForGlobal(F));
164 switch (F->getLinkage()) {
165 default: assert(0 && "Unknown linkage type!");
166 case Function::InternalLinkage: // Symbols default to internal.
167 case Function::PrivateLinkage:
168 EmitAlignment(FnAlign, F);
170 case Function::DLLExportLinkage:
171 case Function::ExternalLinkage:
172 EmitAlignment(FnAlign, F);
173 O << "\t.globl\t" << CurrentFnName << '\n';
175 case Function::LinkOnceAnyLinkage:
176 case Function::LinkOnceODRLinkage:
177 case Function::WeakAnyLinkage:
178 case Function::WeakODRLinkage:
179 EmitAlignment(FnAlign, F);
180 if (Subtarget->isTargetDarwin()) {
181 O << "\t.globl\t" << CurrentFnName << '\n';
182 O << TAI->getWeakDefDirective() << CurrentFnName << '\n';
183 } else if (Subtarget->isTargetCygMing()) {
184 O << "\t.globl\t" << CurrentFnName << "\n"
185 "\t.linkonce discard\n";
187 O << "\t.weak\t" << CurrentFnName << '\n';
192 printVisibility(CurrentFnName, F->getVisibility());
194 if (Subtarget->isTargetELF())
195 O << "\t.type\t" << CurrentFnName << ",@function\n";
196 else if (Subtarget->isTargetCygMing()) {
197 O << "\t.def\t " << CurrentFnName
199 (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT)
200 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
204 O << CurrentFnName << ":\n";
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 unsigned 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->makeNameProper(F->getName(), ""));
233 // Print the 'header' of function
234 emitFunctionHeader(MF);
236 // Emit pre-function debug and/or EH information.
237 if (TAI->doesSupportDebugInformation() || TAI->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 printBasicBlockLabel(I, true, true, VerboseAsm);
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 (TAI->hasDotTypeDotSizeDirective())
270 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
272 // Emit post-function debug information.
273 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
274 DW->EndFunction(&MF);
276 // Print out jump tables referenced by the function.
277 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
281 // We didn't modify anything.
285 /// print_pcrel_imm - This is used to print an immediate value that ends up
286 /// being encoded as a pc-relative value. These print slightly differently, for
287 /// example, a $ is not emitted.
288 void X86ATTAsmPrinter::print_pcrel_imm(const MachineInstr *MI, unsigned OpNo) {
289 const MachineOperand &MO = MI->getOperand(OpNo);
290 switch (MO.getType()) {
291 default: assert(0 && "Unknown pcrel immediate operand");
292 case MachineOperand::MO_Immediate:
295 case MachineOperand::MO_MachineBasicBlock:
296 printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm);
299 case MachineOperand::MO_GlobalAddress: {
300 const GlobalValue *GV = MO.getGlobal();
301 std::string Name = Mang->getValueName(GV);
302 decorateName(Name, GV);
304 bool needCloseParen = false;
305 if (Name[0] == '$') {
306 // The name begins with a dollar-sign. In order to avoid having it look
307 // like an integer immediate to the assembler, enclose it in parens.
309 needCloseParen = true;
312 // Handle dllimport linkage.
313 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT)
314 O << "__imp_" << Name;
315 else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
316 FnStubs.insert(Name);
317 printSuffixedName(Name, "$stub");
322 // Assemble call via PLT for externally visible symbols.
323 if (MO.getTargetFlags() == X86II::MO_PLT)
326 if (Subtarget->isTargetCygMing() && GV->isDeclaration())
327 // Save function name for later type emission
328 CygMingStubs.insert(Name);
330 printOffset(MO.getOffset());
337 case MachineOperand::MO_ExternalSymbol: {
338 bool needCloseParen = false;
339 std::string Name(TAI->getGlobalPrefix());
340 Name += MO.getSymbolName();
342 if (Name[0] == '$') {
343 // The name begins with a dollar-sign. In order to avoid having it look
344 // like an integer immediate to the assembler, enclose it in parens.
346 needCloseParen = true;
349 if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) {
350 FnStubs.insert(Name);
351 printSuffixedName(Name, "$stub");
356 if (MO.getTargetFlags() == X86II::MO_GOT_ABSOLUTE_ADDRESS) {
358 PrintPICBaseSymbol();
362 if (MO.getTargetFlags() == X86II::MO_PLT)
373 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
374 const char *Modifier) {
375 const MachineOperand &MO = MI->getOperand(OpNo);
376 switch (MO.getType()) {
377 default: assert(0 && "unknown operand type!");
378 case MachineOperand::MO_Register: {
379 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
380 "Virtual registers should not make it this far!");
382 unsigned Reg = MO.getReg();
383 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
384 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
385 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
386 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
387 Reg = getX86SubSuperRegister(Reg, VT);
389 O << TRI->getAsmName(Reg);
393 case MachineOperand::MO_Immediate:
394 if (!Modifier || (strcmp(Modifier, "debug") && strcmp(Modifier, "mem")))
398 case MachineOperand::MO_JumpTableIndex: {
399 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
400 if (!isMemOp) O << '$';
401 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
405 case MachineOperand::MO_ConstantPoolIndex: {
406 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
407 if (!isMemOp) O << '$';
408 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
411 printOffset(MO.getOffset());
414 case MachineOperand::MO_GlobalAddress: {
415 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
416 const GlobalValue *GV = MO.getGlobal();
417 std::string Name = Mang->getValueName(GV);
418 decorateName(Name, GV);
420 bool needCloseParen = false;
423 else if (Name[0] == '$') {
424 // The name begins with a dollar-sign. In order to avoid having it look
425 // like an integer immediate to the assembler, enclose it in parens.
427 needCloseParen = true;
430 // Handle dllimport linkage.
431 if (MO.getTargetFlags() == X86II::MO_DLLIMPORT) {
432 O << "__imp_" << Name;
433 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
434 MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) {
435 GVStubs.insert(Name);
436 printSuffixedName(Name, "$non_lazy_ptr");
437 } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY ||
438 MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){
439 HiddenGVStubs.insert(Name);
440 printSuffixedName(Name, "$non_lazy_ptr");
448 printOffset(MO.getOffset());
451 case MachineOperand::MO_ExternalSymbol:
452 /// NOTE: MO_ExternalSymbol in a non-pcrel_imm context is *only* generated
453 /// by _GLOBAL_OFFSET_TABLE_ on X86-32. All others are call operands, which
455 assert(!Subtarget->is64Bit());
456 // These are never used as memory operands.
457 assert(Modifier == 0 || strcmp(Modifier, "mem"));
459 O << TAI->getGlobalPrefix();
460 O << MO.getSymbolName();
464 switch (MO.getTargetFlags()) {
466 assert(0 && "Unknown target flag on GV operand");
467 case X86II::MO_NO_FLAG: // No flag.
469 case X86II::MO_DARWIN_NONLAZY:
470 case X86II::MO_DARWIN_HIDDEN_NONLAZY:
471 case X86II::MO_DLLIMPORT:
472 // These affect the name of the symbol, not any suffix.
474 case X86II::MO_GOT_ABSOLUTE_ADDRESS:
476 PrintPICBaseSymbol();
479 case X86II::MO_PIC_BASE_OFFSET:
480 case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
481 case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
483 PrintPICBaseSymbol();
485 case X86II::MO_TLSGD: O << "@TLSGD"; break;
486 case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break;
487 case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break;
488 case X86II::MO_TPOFF: O << "@TPOFF"; break;
489 case X86II::MO_NTPOFF: O << "@NTPOFF"; break;
490 case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break;
491 case X86II::MO_GOT: O << "@GOT"; break;
492 case X86II::MO_GOTOFF: O << "@GOTOFF"; break;
496 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
497 unsigned char value = MI->getOperand(Op).getImm();
498 assert(value <= 7 && "Invalid ssecc argument!");
500 case 0: O << "eq"; break;
501 case 1: O << "lt"; break;
502 case 2: O << "le"; break;
503 case 3: O << "unord"; break;
504 case 4: O << "neq"; break;
505 case 5: O << "nlt"; break;
506 case 6: O << "nle"; break;
507 case 7: O << "ord"; break;
511 void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op,
512 const char *Modifier) {
513 const MachineOperand &BaseReg = MI->getOperand(Op);
514 const MachineOperand &IndexReg = MI->getOperand(Op+2);
515 const MachineOperand &DispSpec = MI->getOperand(Op+3);
517 // If we really don't want to print out (rip), don't.
518 bool HasBaseReg = BaseReg.getReg() != 0;
519 if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") &&
520 BaseReg.getReg() == X86::RIP)
523 // HasParenPart - True if we will print out the () part of the mem ref.
524 bool HasParenPart = IndexReg.getReg() || HasBaseReg;
526 if (DispSpec.isImm()) {
527 int DispVal = DispSpec.getImm();
528 if (DispVal || !HasParenPart)
531 assert(DispSpec.isGlobal() || DispSpec.isCPI() ||
532 DispSpec.isJTI() || DispSpec.isSymbol());
533 printOperand(MI, Op+3, "mem");
537 assert(IndexReg.getReg() != X86::ESP &&
538 "X86 doesn't allow scaling by ESP");
542 printOperand(MI, Op, Modifier);
544 if (IndexReg.getReg()) {
546 printOperand(MI, Op+2, Modifier);
547 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
549 O << ',' << ScaleVal;
555 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
556 const char *Modifier) {
557 assert(isMem(MI, Op) && "Invalid memory reference!");
558 const MachineOperand &Segment = MI->getOperand(Op+4);
559 if (Segment.getReg()) {
560 printOperand(MI, Op+4, Modifier);
563 printLeaMemReference(MI, Op, Modifier);
566 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
567 const MachineBasicBlock *MBB) const {
568 if (!TAI->getSetDirective())
571 // We don't need .set machinery if we have GOT-style relocations
572 if (Subtarget->isPICStyleGOT())
575 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
576 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
577 printBasicBlockLabel(MBB, false, false, false);
578 if (Subtarget->isPICStyleRIPRel())
579 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
580 << '_' << uid << '\n';
583 PrintPICBaseSymbol();
589 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
590 PrintPICBaseSymbol();
592 PrintPICBaseSymbol();
597 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
598 const MachineBasicBlock *MBB,
601 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
602 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
604 O << JTEntryDirective << ' ';
606 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStubPIC(TM)) {
607 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
608 << '_' << uid << "_set_" << MBB->getNumber();
609 } else if (Subtarget->isPICStyleGOT()) {
610 printBasicBlockLabel(MBB, false, false, false);
613 printBasicBlockLabel(MBB, false, false, false);
616 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, char Mode) {
617 unsigned Reg = MO.getReg();
619 default: return true; // Unknown mode.
620 case 'b': // Print QImode register
621 Reg = getX86SubSuperRegister(Reg, MVT::i8);
623 case 'h': // Print QImode high register
624 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
626 case 'w': // Print HImode register
627 Reg = getX86SubSuperRegister(Reg, MVT::i16);
629 case 'k': // Print SImode register
630 Reg = getX86SubSuperRegister(Reg, MVT::i32);
632 case 'q': // Print DImode register
633 Reg = getX86SubSuperRegister(Reg, MVT::i64);
637 O << '%'<< TRI->getAsmName(Reg);
641 /// PrintAsmOperand - Print out an operand for an inline asm expression.
643 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
645 const char *ExtraCode) {
646 // Does this asm operand have a single letter operand modifier?
647 if (ExtraCode && ExtraCode[0]) {
648 if (ExtraCode[1] != 0) return true; // Unknown modifier.
650 switch (ExtraCode[0]) {
651 default: return true; // Unknown modifier.
652 case 'c': // Don't print "$" before a global var name or constant.
653 printOperand(MI, OpNo, "mem");
656 case 'A': // Print '*' before a register (it must be a register)
657 if (MI->getOperand(OpNo).isReg()) {
659 printOperand(MI, OpNo);
664 case 'b': // Print QImode register
665 case 'h': // Print QImode high register
666 case 'w': // Print HImode register
667 case 'k': // Print SImode register
668 case 'q': // Print DImode register
669 if (MI->getOperand(OpNo).isReg())
670 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
671 printOperand(MI, OpNo);
674 case 'P': // This is the operand of a call, treat specially.
675 print_pcrel_imm(MI, OpNo);
678 case 'n': { // Negate the immediate or print a '-' before the operand.
679 // Note: this is a temporary solution. It should be handled target
680 // independently as part of the 'MC' work.
681 const MachineOperand &MO = MI->getOperand(OpNo);
691 printOperand(MI, OpNo);
695 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
698 const char *ExtraCode) {
699 if (ExtraCode && ExtraCode[0]) {
700 if (ExtraCode[1] != 0) return true; // Unknown modifier.
702 switch (ExtraCode[0]) {
703 default: return true; // Unknown modifier.
704 case 'b': // Print QImode register
705 case 'h': // Print QImode high register
706 case 'w': // Print HImode register
707 case 'k': // Print SImode register
708 case 'q': // Print SImode register
709 // These only apply to registers, ignore on mem.
711 case 'P': // Don't print @PLT, but do print as memory.
712 printMemReference(MI, OpNo, "no-rip");
716 printMemReference(MI, OpNo);
720 static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
721 // Convert registers in the addr mode according to subreg64.
722 for (unsigned i = 0; i != 4; ++i) {
723 if (!MI->getOperand(i).isReg()) continue;
725 unsigned Reg = MI->getOperand(i).getReg();
726 if (Reg == 0) continue;
728 MI->getOperand(i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
732 /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in
733 /// AT&T syntax to the current output stream.
735 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
739 if (MI->getOpcode() == TargetInstrInfo::INLINEASM) {
743 } else if (MI->isLabel()) {
746 } else if (MI->getOpcode() == TargetInstrInfo::DECLARE) {
749 } else if (MI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF) {
750 printImplicitDef(MI);
757 TmpInst.setOpcode(MI->getOpcode());
759 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
760 const MachineOperand &MO = MI->getOperand(i);
764 MCOp.MakeReg(MO.getReg());
765 } else if (MO.isImm()) {
766 MCOp.MakeImm(MO.getImm());
767 } else if (MO.isMBB()) {
768 MCOp.MakeMBBLabel(getFunctionNumber(), MO.getMBB()->getNumber());
770 assert(0 && "Unimp");
773 TmpInst.addOperand(MCOp);
776 switch (TmpInst.getOpcode()) {
778 // Handle the 'subreg rewriting' for the lea64_32mem operand.
779 lower_lea64_32mem(&TmpInst, 1);
783 // FIXME: Convert TmpInst.
784 printInstruction(&TmpInst);
788 // Call the autogenerated instruction printer routines.
789 printInstruction(MI);
793 bool X86ATTAsmPrinter::doInitialization(Module &M) {
795 Context = new MCContext();
796 // FIXME: Send this to "O" instead of outs(). For now, we force it to
797 // stdout to make it easy to compare.
798 Streamer = createAsmStreamer(*Context, outs());
801 return AsmPrinter::doInitialization(M);
804 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
805 const TargetData *TD = TM.getTargetData();
807 if (!GVar->hasInitializer())
808 return; // External global require no code
810 // Check to see if this is a special global used by LLVM, if so, emit it.
811 if (EmitSpecialLLVMGlobal(GVar)) {
812 if (Subtarget->isTargetDarwin() &&
813 TM.getRelocationModel() == Reloc::Static) {
814 if (GVar->getName() == "llvm.global_ctors")
815 O << ".reference .constructors_used\n";
816 else if (GVar->getName() == "llvm.global_dtors")
817 O << ".reference .destructors_used\n";
822 std::string name = Mang->getValueName(GVar);
823 Constant *C = GVar->getInitializer();
824 if (isa<MDNode>(C) || isa<MDString>(C))
826 const Type *Type = C->getType();
827 unsigned Size = TD->getTypeAllocSize(Type);
828 unsigned Align = TD->getPreferredAlignmentLog(GVar);
830 printVisibility(name, GVar->getVisibility());
832 if (Subtarget->isTargetELF())
833 O << "\t.type\t" << name << ",@object\n";
835 SwitchToSection(TAI->SectionForGlobal(GVar));
837 if (C->isNullValue() && !GVar->hasSection() &&
838 !(Subtarget->isTargetDarwin() &&
839 TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) {
840 // FIXME: This seems to be pretty darwin-specific
841 if (GVar->hasExternalLinkage()) {
842 if (const char *Directive = TAI->getZeroFillDirective()) {
843 O << "\t.globl " << name << '\n';
844 O << Directive << "__DATA, __common, " << name << ", "
845 << Size << ", " << Align << '\n';
850 if (!GVar->isThreadLocal() &&
851 (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
852 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
854 if (TAI->getLCOMMDirective() != NULL) {
855 if (GVar->hasLocalLinkage()) {
856 O << TAI->getLCOMMDirective() << name << ',' << Size;
857 if (Subtarget->isTargetDarwin())
859 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
860 O << "\t.globl " << name << '\n'
861 << TAI->getWeakDefDirective() << name << '\n';
862 EmitAlignment(Align, GVar);
865 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
866 PrintUnmangledNameSafely(GVar, O);
869 EmitGlobalConstant(C);
872 O << TAI->getCOMMDirective() << name << ',' << Size;
873 if (TAI->getCOMMDirectiveTakesAlignment())
874 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
877 if (!Subtarget->isTargetCygMing()) {
878 if (GVar->hasLocalLinkage())
879 O << "\t.local\t" << name << '\n';
881 O << TAI->getCOMMDirective() << name << ',' << Size;
882 if (TAI->getCOMMDirectiveTakesAlignment())
883 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
886 O << "\t\t" << TAI->getCommentString() << ' ';
887 PrintUnmangledNameSafely(GVar, O);
894 switch (GVar->getLinkage()) {
895 case GlobalValue::CommonLinkage:
896 case GlobalValue::LinkOnceAnyLinkage:
897 case GlobalValue::LinkOnceODRLinkage:
898 case GlobalValue::WeakAnyLinkage:
899 case GlobalValue::WeakODRLinkage:
900 if (Subtarget->isTargetDarwin()) {
901 O << "\t.globl " << name << '\n'
902 << TAI->getWeakDefDirective() << name << '\n';
903 } else if (Subtarget->isTargetCygMing()) {
904 O << "\t.globl\t" << name << "\n"
905 "\t.linkonce same_size\n";
907 O << "\t.weak\t" << name << '\n';
910 case GlobalValue::DLLExportLinkage:
911 case GlobalValue::AppendingLinkage:
912 // FIXME: appending linkage variables should go into a section of
913 // their name or something. For now, just emit them as external.
914 case GlobalValue::ExternalLinkage:
915 // If external or appending, declare as a global symbol
916 O << "\t.globl " << name << '\n';
918 case GlobalValue::PrivateLinkage:
919 case GlobalValue::InternalLinkage:
922 assert(0 && "Unknown linkage type!");
925 EmitAlignment(Align, GVar);
928 O << "\t\t\t\t" << TAI->getCommentString() << ' ';
929 PrintUnmangledNameSafely(GVar, O);
932 if (TAI->hasDotTypeDotSizeDirective())
933 O << "\t.size\t" << name << ", " << Size << '\n';
935 EmitGlobalConstant(C);
938 bool X86ATTAsmPrinter::doFinalization(Module &M) {
939 // Print out module-level global variables here.
940 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
942 printModuleLevelGV(I);
944 if (I->hasDLLExportLinkage())
945 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
948 if (Subtarget->isTargetDarwin()) {
949 SwitchToDataSection("");
951 // Add the (possibly multiple) personalities to the set of global value
952 // stubs. Only referenced functions get into the Personalities list.
953 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
954 const std::vector<Function*> &Personalities = MMI->getPersonalities();
955 for (unsigned i = 0, e = Personalities.size(); i != e; ++i) {
956 if (Personalities[i] == 0)
958 std::string Name = Mang->getValueName(Personalities[i]);
959 decorateName(Name, Personalities[i]);
960 GVStubs.insert(Name);
964 // Output stubs for dynamically-linked functions
965 if (!FnStubs.empty()) {
966 for (StringSet<>::iterator I = FnStubs.begin(), E = FnStubs.end();
968 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
969 "self_modifying_code+pure_instructions,5", 0);
970 const char *Name = I->getKeyData();
971 printSuffixedName(Name, "$stub");
973 "\t.indirect_symbol " << Name << "\n"
974 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
979 // Output stubs for external and common global variables.
980 if (!GVStubs.empty()) {
982 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
983 for (StringSet<>::iterator I = GVStubs.begin(), E = GVStubs.end();
985 const char *Name = I->getKeyData();
986 printSuffixedName(Name, "$non_lazy_ptr");
987 O << ":\n\t.indirect_symbol " << Name << "\n\t.long\t0\n";
991 if (!HiddenGVStubs.empty()) {
992 SwitchToSection(TAI->getDataSection());
994 for (StringSet<>::iterator I = HiddenGVStubs.begin(),
995 E = HiddenGVStubs.end(); I != E; ++I) {
996 const char *Name = I->getKeyData();
997 printSuffixedName(Name, "$non_lazy_ptr");
998 O << ":\n" << TAI->getData32bitsDirective() << Name << '\n';
1002 // Funny Darwin hack: This flag tells the linker that no global symbols
1003 // contain code that falls through to other global symbols (e.g. the obvious
1004 // implementation of multiple entry points). If this doesn't occur, the
1005 // linker can safely perform dead code stripping. Since LLVM never
1006 // generates code that does this, it is always safe to set.
1007 O << "\t.subsections_via_symbols\n";
1008 } else if (Subtarget->isTargetCygMing()) {
1009 // Emit type information for external functions
1010 for (StringSet<>::iterator i = CygMingStubs.begin(), e = CygMingStubs.end();
1012 O << "\t.def\t " << i->getKeyData()
1013 << ";\t.scl\t" << COFF::C_EXT
1014 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
1020 // Output linker support code for dllexported globals on windows.
1021 if (!DLLExportedGVs.empty()) {
1022 SwitchToDataSection(".section .drectve");
1024 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
1025 e = DLLExportedGVs.end(); i != e; ++i)
1026 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
1029 if (!DLLExportedFns.empty()) {
1030 SwitchToDataSection(".section .drectve");
1032 for (StringSet<>::iterator i = DLLExportedFns.begin(),
1033 e = DLLExportedFns.end();
1035 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
1038 // Do common shutdown.
1039 bool Changed = AsmPrinter::doFinalization(M);
1041 if (NewAsmPrinter) {
1053 // Include the auto-generated portion of the assembly writer.
1054 #include "X86GenAsmWriter.inc"