1 //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC 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 PowerPC assembly language. This printer is
12 // the output mechanism used by `llc'.
14 // Documentation at http://developer.apple.com/documentation/DeveloperTools/
15 // Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
17 //===----------------------------------------------------------------------===//
19 #define DEBUG_TYPE "asmprinter"
21 #include "PPCPredicates.h"
22 #include "PPCTargetMachine.h"
23 #include "PPCSubtarget.h"
24 #include "llvm/Constants.h"
25 #include "llvm/DerivedTypes.h"
26 #include "llvm/Module.h"
27 #include "llvm/Assembly/Writer.h"
28 #include "llvm/CodeGen/AsmPrinter.h"
29 #include "llvm/CodeGen/DwarfWriter.h"
30 #include "llvm/CodeGen/MachineModuleInfo.h"
31 #include "llvm/CodeGen/MachineFunctionPass.h"
32 #include "llvm/CodeGen/MachineInstr.h"
33 #include "llvm/CodeGen/MachineInstrBuilder.h"
34 #include "llvm/MC/MCAsmInfo.h"
35 #include "llvm/MC/MCSectionMachO.h"
36 #include "llvm/MC/MCStreamer.h"
37 #include "llvm/MC/MCSymbol.h"
38 #include "llvm/Target/TargetLoweringObjectFile.h"
39 #include "llvm/Target/TargetRegisterInfo.h"
40 #include "llvm/Target/TargetInstrInfo.h"
41 #include "llvm/Target/TargetOptions.h"
42 #include "llvm/Target/TargetRegistry.h"
43 #include "llvm/Support/Mangler.h"
44 #include "llvm/Support/MathExtras.h"
45 #include "llvm/Support/CommandLine.h"
46 #include "llvm/Support/Debug.h"
47 #include "llvm/Support/ErrorHandling.h"
48 #include "llvm/Support/FormattedStream.h"
49 #include "llvm/ADT/Statistic.h"
50 #include "llvm/ADT/StringExtras.h"
51 #include "llvm/ADT/StringSet.h"
54 STATISTIC(EmittedInsts, "Number of machine instrs printed");
57 class PPCAsmPrinter : public AsmPrinter {
60 std::string Stub, LazyPtr, AnonSymbol;
64 void Init(const GlobalValue *GV, Mangler *Mang) {
65 // Already initialized.
66 if (!Stub.empty()) return;
67 Stub = Mang->getMangledName(GV, "$stub", true);
68 LazyPtr = Mang->getMangledName(GV, "$lazy_ptr", true);
69 AnonSymbol = Mang->getMangledName(GV, "$stub$tmp", true);
72 void Init(const std::string &GV, Mangler *Mang) {
73 // Already initialized.
74 if (!Stub.empty()) return;
75 Stub = Mang->makeNameProper(GV + "$stub",
77 LazyPtr = Mang->makeNameProper(GV + "$lazy_ptr",
79 AnonSymbol = Mang->makeNameProper(GV + "$stub$tmp",
84 StringMap<FnStubInfo> FnStubs;
85 StringMap<std::string> GVStubs, HiddenGVStubs, TOC;
86 const PPCSubtarget &Subtarget;
89 explicit PPCAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
90 const MCAsmInfo *T, bool V)
91 : AsmPrinter(O, TM, T, V),
92 Subtarget(TM.getSubtarget<PPCSubtarget>()), LabelID(0) {}
94 virtual const char *getPassName() const {
95 return "PowerPC Assembly Printer";
98 PPCTargetMachine &getTM() {
99 return static_cast<PPCTargetMachine&>(TM);
102 unsigned enumRegToMachineReg(unsigned enumReg) {
104 default: llvm_unreachable("Unhandled register!");
105 case PPC::CR0: return 0;
106 case PPC::CR1: return 1;
107 case PPC::CR2: return 2;
108 case PPC::CR3: return 3;
109 case PPC::CR4: return 4;
110 case PPC::CR5: return 5;
111 case PPC::CR6: return 6;
112 case PPC::CR7: return 7;
117 /// printInstruction - This method is automatically generated by tablegen
118 /// from the instruction set description. This method returns true if the
119 /// machine instruction was sufficiently described to print it, otherwise it
121 void printInstruction(const MachineInstr *MI);
122 static const char *getRegisterName(unsigned RegNo);
125 void printMachineInstruction(const MachineInstr *MI);
126 void printOp(const MachineOperand &MO);
128 /// stripRegisterPrefix - This method strips the character prefix from a
129 /// register name so that only the number is left. Used by for linux asm.
130 const char *stripRegisterPrefix(const char *RegName) {
131 switch (RegName[0]) {
134 case 'v': return RegName + 1;
135 case 'c': if (RegName[1] == 'r') return RegName + 2;
141 /// printRegister - Print register according to target requirements.
143 void printRegister(const MachineOperand &MO, bool R0AsZero) {
144 unsigned RegNo = MO.getReg();
145 assert(TargetRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??");
147 // If we should use 0 for R0.
148 if (R0AsZero && RegNo == PPC::R0) {
153 const char *RegName = getRegisterName(RegNo);
154 // Linux assembler (Others?) does not take register mnemonics.
155 // FIXME - What about special registers used in mfspr/mtspr?
156 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
160 void printOperand(const MachineInstr *MI, unsigned OpNo) {
161 const MachineOperand &MO = MI->getOperand(OpNo);
163 printRegister(MO, false);
164 } else if (MO.isImm()) {
171 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
172 unsigned AsmVariant, const char *ExtraCode);
173 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
174 unsigned AsmVariant, const char *ExtraCode);
177 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
178 char value = MI->getOperand(OpNo).getImm();
179 value = (value << (32-5)) >> (32-5);
182 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
183 unsigned char value = MI->getOperand(OpNo).getImm();
184 assert(value <= 31 && "Invalid u5imm argument!");
185 O << (unsigned int)value;
187 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) {
188 unsigned char value = MI->getOperand(OpNo).getImm();
189 assert(value <= 63 && "Invalid u6imm argument!");
190 O << (unsigned int)value;
192 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
193 O << (short)MI->getOperand(OpNo).getImm();
195 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
196 O << (unsigned short)MI->getOperand(OpNo).getImm();
198 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
199 if (MI->getOperand(OpNo).isImm()) {
200 O << (short)(MI->getOperand(OpNo).getImm()*4);
203 printOp(MI->getOperand(OpNo));
204 if (TM.getRelocationModel() == Reloc::PIC_)
205 O << "-\"L" << getFunctionNumber() << "$pb\")";
210 void printBranchOperand(const MachineInstr *MI, unsigned OpNo) {
211 // Branches can take an immediate operand. This is used by the branch
212 // selection pass to print $+8, an eight byte displacement from the PC.
213 if (MI->getOperand(OpNo).isImm()) {
214 O << "$+" << MI->getOperand(OpNo).getImm()*4;
216 printOp(MI->getOperand(OpNo));
219 void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
220 const MachineOperand &MO = MI->getOperand(OpNo);
221 if (TM.getRelocationModel() != Reloc::Static) {
222 if (MO.getType() == MachineOperand::MO_GlobalAddress) {
223 GlobalValue *GV = MO.getGlobal();
224 if (GV->isDeclaration() || GV->isWeakForLinker()) {
225 // Dynamically-resolved functions need a stub for the function.
226 FnStubInfo &FnInfo = FnStubs[Mang->getMangledName(GV)];
227 FnInfo.Init(GV, Mang);
232 if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
233 FnStubInfo &FnInfo =FnStubs[Mang->makeNameProper(MO.getSymbolName())];
234 FnInfo.Init(MO.getSymbolName(), Mang);
240 printOp(MI->getOperand(OpNo));
242 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
243 O << (int)MI->getOperand(OpNo).getImm()*4;
245 void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
246 O << "\"L" << getFunctionNumber() << "$pb\"\n";
247 O << "\"L" << getFunctionNumber() << "$pb\":";
249 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
250 if (MI->getOperand(OpNo).isImm()) {
251 printS16ImmOperand(MI, OpNo);
253 if (Subtarget.isDarwin()) O << "ha16(";
254 printOp(MI->getOperand(OpNo));
255 if (TM.getRelocationModel() == Reloc::PIC_)
256 O << "-\"L" << getFunctionNumber() << "$pb\"";
257 if (Subtarget.isDarwin())
263 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
264 if (MI->getOperand(OpNo).isImm()) {
265 printS16ImmOperand(MI, OpNo);
267 if (Subtarget.isDarwin()) O << "lo16(";
268 printOp(MI->getOperand(OpNo));
269 if (TM.getRelocationModel() == Reloc::PIC_)
270 O << "-\"L" << getFunctionNumber() << "$pb\"";
271 if (Subtarget.isDarwin())
277 void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
278 unsigned CCReg = MI->getOperand(OpNo).getReg();
279 unsigned RegNo = enumRegToMachineReg(CCReg);
280 O << (0x80 >> RegNo);
282 // The new addressing mode printers.
283 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
284 printSymbolLo(MI, OpNo);
286 if (MI->getOperand(OpNo+1).isReg() &&
287 MI->getOperand(OpNo+1).getReg() == PPC::R0)
290 printOperand(MI, OpNo+1);
293 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) {
294 if (MI->getOperand(OpNo).isImm())
295 printS16X4ImmOperand(MI, OpNo);
297 printSymbolLo(MI, OpNo);
299 if (MI->getOperand(OpNo+1).isReg() &&
300 MI->getOperand(OpNo+1).getReg() == PPC::R0)
303 printOperand(MI, OpNo+1);
307 void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
308 // When used as the base register, r0 reads constant zero rather than
309 // the value contained in the register. For this reason, the darwin
310 // assembler requires that we print r0 as 0 (no r) when used as the base.
311 const MachineOperand &MO = MI->getOperand(OpNo);
312 printRegister(MO, true);
314 printOperand(MI, OpNo+1);
317 void printTOCEntryLabel(const MachineInstr *MI, unsigned OpNo) {
318 const MachineOperand &MO = MI->getOperand(OpNo);
320 assert(MO.getType() == MachineOperand::MO_GlobalAddress);
322 GlobalValue *GV = MO.getGlobal();
324 std::string Name = Mang->getMangledName(GV);
326 // Map symbol -> label of TOC entry.
327 if (TOC.count(Name) == 0) {
329 Label += MAI->getPrivateGlobalPrefix();
331 Label += utostr(LabelID++);
336 O << TOC[Name] << "@toc";
339 void printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
340 const char *Modifier);
342 virtual bool runOnMachineFunction(MachineFunction &F) = 0;
345 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
346 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
348 explicit PPCLinuxAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
349 const MCAsmInfo *T, bool V)
350 : PPCAsmPrinter(O, TM, T, V){}
352 virtual const char *getPassName() const {
353 return "Linux PPC Assembly Printer";
356 bool runOnMachineFunction(MachineFunction &F);
357 bool doFinalization(Module &M);
359 void getAnalysisUsage(AnalysisUsage &AU) const {
360 AU.setPreservesAll();
361 AU.addRequired<MachineModuleInfo>();
362 AU.addRequired<DwarfWriter>();
363 PPCAsmPrinter::getAnalysisUsage(AU);
366 void PrintGlobalVariable(const GlobalVariable *GVar);
369 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
371 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
372 formatted_raw_ostream &OS;
374 explicit PPCDarwinAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
375 const MCAsmInfo *T, bool V)
376 : PPCAsmPrinter(O, TM, T, V), OS(O) {}
378 virtual const char *getPassName() const {
379 return "Darwin PPC Assembly Printer";
382 bool runOnMachineFunction(MachineFunction &F);
383 bool doFinalization(Module &M);
384 void EmitStartOfAsmFile(Module &M);
386 void getAnalysisUsage(AnalysisUsage &AU) const {
387 AU.setPreservesAll();
388 AU.addRequired<MachineModuleInfo>();
389 AU.addRequired<DwarfWriter>();
390 PPCAsmPrinter::getAnalysisUsage(AU);
393 void PrintGlobalVariable(const GlobalVariable *GVar);
395 } // end of anonymous namespace
397 // Include the auto-generated portion of the assembly writer
398 #include "PPCGenAsmWriter.inc"
400 void PPCAsmPrinter::printOp(const MachineOperand &MO) {
401 switch (MO.getType()) {
402 case MachineOperand::MO_Immediate:
403 llvm_unreachable("printOp() does not handle immediate values");
405 case MachineOperand::MO_MachineBasicBlock:
406 GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
408 case MachineOperand::MO_JumpTableIndex:
409 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
410 << '_' << MO.getIndex();
411 // FIXME: PIC relocation model
413 case MachineOperand::MO_ConstantPoolIndex:
414 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
415 << '_' << MO.getIndex();
417 case MachineOperand::MO_BlockAddress:
418 GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI);
420 case MachineOperand::MO_ExternalSymbol: {
421 // Computing the address of an external symbol, not calling it.
422 std::string Name(MAI->getGlobalPrefix());
423 Name += MO.getSymbolName();
425 if (TM.getRelocationModel() != Reloc::Static) {
426 GVStubs[Name] = Name+"$non_lazy_ptr";
427 Name += "$non_lazy_ptr";
432 case MachineOperand::MO_GlobalAddress: {
433 // Computing the address of a global symbol, not calling it.
434 GlobalValue *GV = MO.getGlobal();
437 // External or weakly linked global variables need non-lazily-resolved stubs
438 if (TM.getRelocationModel() != Reloc::Static &&
439 (GV->isDeclaration() || GV->isWeakForLinker())) {
440 if (!GV->hasHiddenVisibility()) {
441 Name = Mang->getMangledName(GV, "$non_lazy_ptr", true);
442 GVStubs[Mang->getMangledName(GV)] = Name;
443 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
444 GV->hasAvailableExternallyLinkage()) {
445 Name = Mang->getMangledName(GV, "$non_lazy_ptr", true);
446 HiddenGVStubs[Mang->getMangledName(GV)] = Name;
448 Name = Mang->getMangledName(GV);
451 Name = Mang->getMangledName(GV);
455 printOffset(MO.getOffset());
460 O << "<unknown operand type: " << MO.getType() << ">";
465 /// PrintAsmOperand - Print out an operand for an inline asm expression.
467 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
469 const char *ExtraCode) {
470 // Does this asm operand have a single letter operand modifier?
471 if (ExtraCode && ExtraCode[0]) {
472 if (ExtraCode[1] != 0) return true; // Unknown modifier.
474 switch (ExtraCode[0]) {
475 default: return true; // Unknown modifier.
476 case 'c': // Don't print "$" before a global var name or constant.
477 // PPC never has a prefix.
478 printOperand(MI, OpNo);
480 case 'L': // Write second word of DImode reference.
481 // Verify that this operand has two consecutive registers.
482 if (!MI->getOperand(OpNo).isReg() ||
483 OpNo+1 == MI->getNumOperands() ||
484 !MI->getOperand(OpNo+1).isReg())
486 ++OpNo; // Return the high-part.
489 // Write 'i' if an integer constant, otherwise nothing. Used to print
491 if (MI->getOperand(OpNo).isImm())
497 printOperand(MI, OpNo);
501 // At the moment, all inline asm memory operands are a single register.
502 // In any case, the output of this routine should always be just one
503 // assembler operand.
505 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
507 const char *ExtraCode) {
508 if (ExtraCode && ExtraCode[0])
509 return true; // Unknown modifier.
510 assert (MI->getOperand(OpNo).isReg());
512 printOperand(MI, OpNo);
517 void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
518 const char *Modifier) {
519 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
520 unsigned Code = MI->getOperand(OpNo).getImm();
521 if (!strcmp(Modifier, "cc")) {
522 switch ((PPC::Predicate)Code) {
523 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
524 case PPC::PRED_LT: O << "lt"; return;
525 case PPC::PRED_LE: O << "le"; return;
526 case PPC::PRED_EQ: O << "eq"; return;
527 case PPC::PRED_GE: O << "ge"; return;
528 case PPC::PRED_GT: O << "gt"; return;
529 case PPC::PRED_NE: O << "ne"; return;
530 case PPC::PRED_UN: O << "un"; return;
531 case PPC::PRED_NU: O << "nu"; return;
535 assert(!strcmp(Modifier, "reg") &&
536 "Need to specify 'cc' or 'reg' as predicate op modifier!");
537 // Don't print the register for 'always'.
538 if (Code == PPC::PRED_ALWAYS) return;
539 printOperand(MI, OpNo+1);
544 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
545 /// the current output stream.
547 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
550 processDebugLoc(MI, true);
552 // Check for slwi/srwi mnemonics.
553 if (MI->getOpcode() == PPC::RLWINM) {
554 bool FoundMnemonic = false;
555 unsigned char SH = MI->getOperand(2).getImm();
556 unsigned char MB = MI->getOperand(3).getImm();
557 unsigned char ME = MI->getOperand(4).getImm();
558 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
559 O << "\tslwi "; FoundMnemonic = true;
561 if (SH <= 31 && MB == (32-SH) && ME == 31) {
562 O << "\tsrwi "; FoundMnemonic = true;
569 O << ", " << (unsigned int)SH << '\n';
572 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
573 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
581 } else if (MI->getOpcode() == PPC::RLDICR) {
582 unsigned char SH = MI->getOperand(2).getImm();
583 unsigned char ME = MI->getOperand(3).getImm();
584 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
590 O << ", " << (unsigned int)SH << '\n';
595 printInstruction(MI);
597 if (VerboseAsm && !MI->getDebugLoc().isUnknown())
601 processDebugLoc(MI, false);
604 /// runOnMachineFunction - This uses the printMachineInstruction()
605 /// method to print assembly for each instruction.
607 bool PPCLinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
610 SetupMachineFunction(MF);
613 // Print out constants referenced by the function
614 EmitConstantPool(MF.getConstantPool());
616 // Print out labels for the function.
617 const Function *F = MF.getFunction();
618 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
620 switch (F->getLinkage()) {
621 default: llvm_unreachable("Unknown linkage type!");
622 case Function::PrivateLinkage:
623 case Function::InternalLinkage: // Symbols default to internal.
625 case Function::ExternalLinkage:
626 O << "\t.global\t" << CurrentFnName << '\n'
627 << "\t.type\t" << CurrentFnName << ", @function\n";
629 case Function::LinkerPrivateLinkage:
630 case Function::WeakAnyLinkage:
631 case Function::WeakODRLinkage:
632 case Function::LinkOnceAnyLinkage:
633 case Function::LinkOnceODRLinkage:
634 O << "\t.global\t" << CurrentFnName << '\n';
635 O << "\t.weak\t" << CurrentFnName << '\n';
639 printVisibility(CurrentFnName, F->getVisibility());
641 EmitAlignment(MF.getAlignment(), F);
643 if (Subtarget.isPPC64()) {
644 // Emit an official procedure descriptor.
645 // FIXME 64-bit SVR4: Use MCSection here?
646 O << "\t.section\t\".opd\",\"aw\"\n";
648 O << CurrentFnName << ":\n";
649 O << "\t.quad .L." << CurrentFnName << ",.TOC.@tocbase\n";
650 O << "\t.previous\n";
651 O << ".L." << CurrentFnName << ":\n";
653 O << CurrentFnName << ":\n";
656 // Emit pre-function debug information.
657 DW->BeginFunction(&MF);
659 // Print out code for the function.
660 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
662 // Print a label for the basic block.
663 if (I != MF.begin()) {
664 EmitBasicBlockStart(I);
666 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
668 // Print the assembly for the instruction.
669 printMachineInstruction(II);
673 O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << '\n';
675 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
677 // Emit post-function debug information.
678 DW->EndFunction(&MF);
680 // Print out jump tables referenced by the function.
681 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
683 // We didn't modify anything.
687 void PPCLinuxAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
688 const TargetData *TD = TM.getTargetData();
690 if (!GVar->hasInitializer())
691 return; // External global require no code
693 // Check to see if this is a special global used by LLVM, if so, emit it.
694 if (EmitSpecialLLVMGlobal(GVar))
697 std::string name = Mang->getMangledName(GVar);
699 printVisibility(name, GVar->getVisibility());
701 Constant *C = GVar->getInitializer();
702 const Type *Type = C->getType();
703 unsigned Size = TD->getTypeAllocSize(Type);
704 unsigned Align = TD->getPreferredAlignmentLog(GVar);
706 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GVar, Mang,
709 if (C->isNullValue() && /* FIXME: Verify correct */
710 !GVar->hasSection() &&
711 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
712 GVar->isWeakForLinker())) {
713 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
715 if (GVar->hasExternalLinkage()) {
716 O << "\t.global " << name << '\n';
717 O << "\t.type " << name << ", @object\n";
719 O << "\t.zero " << Size << '\n';
720 } else if (GVar->hasLocalLinkage()) {
721 O << MAI->getLCOMMDirective() << name << ',' << Size;
723 O << ".comm " << name << ',' << Size;
726 O << "\t\t" << MAI->getCommentString() << " '";
727 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
734 switch (GVar->getLinkage()) {
735 case GlobalValue::LinkOnceAnyLinkage:
736 case GlobalValue::LinkOnceODRLinkage:
737 case GlobalValue::WeakAnyLinkage:
738 case GlobalValue::WeakODRLinkage:
739 case GlobalValue::CommonLinkage:
740 case GlobalValue::LinkerPrivateLinkage:
741 O << "\t.global " << name << '\n'
742 << "\t.type " << name << ", @object\n"
743 << "\t.weak " << name << '\n';
745 case GlobalValue::AppendingLinkage:
746 // FIXME: appending linkage variables should go into a section of
747 // their name or something. For now, just emit them as external.
748 case GlobalValue::ExternalLinkage:
749 // If external or appending, declare as a global symbol
750 O << "\t.global " << name << '\n'
751 << "\t.type " << name << ", @object\n";
753 case GlobalValue::InternalLinkage:
754 case GlobalValue::PrivateLinkage:
757 llvm_unreachable("Unknown linkage type!");
760 EmitAlignment(Align, GVar);
763 O << "\t\t\t\t" << MAI->getCommentString() << " '";
764 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
769 EmitGlobalConstant(C);
773 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
774 const TargetData *TD = TM.getTargetData();
776 bool isPPC64 = TD->getPointerSizeInBits() == 64;
778 if (isPPC64 && !TOC.empty()) {
779 // FIXME 64-bit SVR4: Use MCSection here?
780 O << "\t.section\t\".toc\",\"aw\"\n";
782 for (StringMap<std::string>::iterator I = TOC.begin(), E = TOC.end();
784 O << I->second << ":\n";
785 O << "\t.tc " << I->getKeyData() << "[TC]," << I->getKeyData() << '\n';
789 return AsmPrinter::doFinalization(M);
792 /// runOnMachineFunction - This uses the printMachineInstruction()
793 /// method to print assembly for each instruction.
795 bool PPCDarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
798 SetupMachineFunction(MF);
801 // Print out constants referenced by the function
802 EmitConstantPool(MF.getConstantPool());
804 // Print out labels for the function.
805 const Function *F = MF.getFunction();
806 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
808 switch (F->getLinkage()) {
809 default: llvm_unreachable("Unknown linkage type!");
810 case Function::PrivateLinkage:
811 case Function::InternalLinkage: // Symbols default to internal.
813 case Function::ExternalLinkage:
814 O << "\t.globl\t" << CurrentFnName << '\n';
816 case Function::WeakAnyLinkage:
817 case Function::WeakODRLinkage:
818 case Function::LinkOnceAnyLinkage:
819 case Function::LinkOnceODRLinkage:
820 case Function::LinkerPrivateLinkage:
821 O << "\t.globl\t" << CurrentFnName << '\n';
822 O << "\t.weak_definition\t" << CurrentFnName << '\n';
826 printVisibility(CurrentFnName, F->getVisibility());
828 EmitAlignment(MF.getAlignment(), F);
829 O << CurrentFnName << ":\n";
831 // Emit pre-function debug information.
832 DW->BeginFunction(&MF);
834 // If the function is empty, then we need to emit *something*. Otherwise, the
835 // function's label might be associated with something that it wasn't meant to
836 // be associated with. We emit a noop in this situation.
837 MachineFunction::iterator I = MF.begin();
839 if (++I == MF.end() && MF.front().empty())
842 // Print out code for the function.
843 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
845 // Print a label for the basic block.
846 if (I != MF.begin()) {
847 EmitBasicBlockStart(I);
849 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
851 // Print the assembly for the instruction.
852 printMachineInstruction(II);
856 // Emit post-function debug information.
857 DW->EndFunction(&MF);
859 // Print out jump tables referenced by the function.
860 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
862 // We didn't modify anything.
867 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
868 static const char *const CPUDirectives[] = {
880 unsigned Directive = Subtarget.getDarwinDirective();
881 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
882 Directive = PPC::DIR_970;
883 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
884 Directive = PPC::DIR_7400;
885 if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
886 Directive = PPC::DIR_64;
887 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
888 O << "\t.machine " << CPUDirectives[Directive] << '\n';
890 // Prime text sections so they are adjacent. This reduces the likelihood a
891 // large data or debug section causes a branch to exceed 16M limit.
892 TargetLoweringObjectFileMachO &TLOFMacho =
893 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
894 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
895 if (TM.getRelocationModel() == Reloc::PIC_) {
896 OutStreamer.SwitchSection(
897 TLOFMacho.getMachOSection("__TEXT", "__picsymbolstub1",
898 MCSectionMachO::S_SYMBOL_STUBS |
899 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
900 32, SectionKind::getText()));
901 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
902 OutStreamer.SwitchSection(
903 TLOFMacho.getMachOSection("__TEXT","__symbol_stub1",
904 MCSectionMachO::S_SYMBOL_STUBS |
905 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
906 16, SectionKind::getText()));
908 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
911 void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
912 const TargetData *TD = TM.getTargetData();
914 if (!GVar->hasInitializer())
915 return; // External global require no code
917 // Check to see if this is a special global used by LLVM, if so, emit it.
918 if (EmitSpecialLLVMGlobal(GVar)) {
919 if (TM.getRelocationModel() == Reloc::Static) {
920 if (GVar->getName() == "llvm.global_ctors")
921 O << ".reference .constructors_used\n";
922 else if (GVar->getName() == "llvm.global_dtors")
923 O << ".reference .destructors_used\n";
928 std::string name = Mang->getMangledName(GVar);
929 printVisibility(name, GVar->getVisibility());
931 Constant *C = GVar->getInitializer();
932 const Type *Type = C->getType();
933 unsigned Size = TD->getTypeAllocSize(Type);
934 unsigned Align = TD->getPreferredAlignmentLog(GVar);
936 const MCSection *TheSection =
937 getObjFileLowering().SectionForGlobal(GVar, Mang, TM);
938 OutStreamer.SwitchSection(TheSection);
940 /// FIXME: Drive this off the section!
941 if (C->isNullValue() && /* FIXME: Verify correct */
942 !GVar->hasSection() &&
943 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
944 GVar->isWeakForLinker()) &&
945 // Don't put things that should go in the cstring section into "comm".
946 !TheSection->getKind().isMergeableCString()) {
947 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
949 if (GVar->hasExternalLinkage()) {
950 O << "\t.globl " << name << '\n';
951 O << "\t.zerofill __DATA, __common, " << name << ", "
952 << Size << ", " << Align;
953 } else if (GVar->hasLocalLinkage()) {
954 O << MAI->getLCOMMDirective() << name << ',' << Size << ',' << Align;
955 } else if (!GVar->hasCommonLinkage()) {
956 O << "\t.globl " << name << '\n'
957 << MAI->getWeakDefDirective() << name << '\n';
958 EmitAlignment(Align, GVar);
961 O << "\t\t\t\t" << MAI->getCommentString() << " ";
962 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
965 EmitGlobalConstant(C);
968 O << ".comm " << name << ',' << Size;
969 // Darwin 9 and above support aligned common data.
970 if (Subtarget.isDarwin9())
974 O << "\t\t" << MAI->getCommentString() << " '";
975 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
982 switch (GVar->getLinkage()) {
983 case GlobalValue::LinkOnceAnyLinkage:
984 case GlobalValue::LinkOnceODRLinkage:
985 case GlobalValue::WeakAnyLinkage:
986 case GlobalValue::WeakODRLinkage:
987 case GlobalValue::CommonLinkage:
988 case GlobalValue::LinkerPrivateLinkage:
989 O << "\t.globl " << name << '\n'
990 << "\t.weak_definition " << name << '\n';
992 case GlobalValue::AppendingLinkage:
993 // FIXME: appending linkage variables should go into a section of
994 // their name or something. For now, just emit them as external.
995 case GlobalValue::ExternalLinkage:
996 // If external or appending, declare as a global symbol
997 O << "\t.globl " << name << '\n';
999 case GlobalValue::InternalLinkage:
1000 case GlobalValue::PrivateLinkage:
1003 llvm_unreachable("Unknown linkage type!");
1006 EmitAlignment(Align, GVar);
1009 O << "\t\t\t\t" << MAI->getCommentString() << " '";
1010 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
1015 EmitGlobalConstant(C);
1019 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1020 const TargetData *TD = TM.getTargetData();
1022 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1024 // Darwin/PPC always uses mach-o.
1025 TargetLoweringObjectFileMachO &TLOFMacho =
1026 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
1029 const MCSection *LSPSection = 0;
1030 if (!FnStubs.empty()) // .lazy_symbol_pointer
1031 LSPSection = TLOFMacho.getLazySymbolPointerSection();
1034 // Output stubs for dynamically-linked functions
1035 if (TM.getRelocationModel() == Reloc::PIC_ && !FnStubs.empty()) {
1036 const MCSection *StubSection =
1037 TLOFMacho.getMachOSection("__TEXT", "__picsymbolstub1",
1038 MCSectionMachO::S_SYMBOL_STUBS |
1039 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
1040 32, SectionKind::getText());
1041 for (StringMap<FnStubInfo>::iterator I = FnStubs.begin(), E = FnStubs.end();
1043 OutStreamer.SwitchSection(StubSection);
1045 const FnStubInfo &Info = I->second;
1046 O << Info.Stub << ":\n";
1047 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1049 O << "\tbcl 20,31," << Info.AnonSymbol << '\n';
1050 O << Info.AnonSymbol << ":\n";
1051 O << "\tmflr r11\n";
1052 O << "\taddis r11,r11,ha16(" << Info.LazyPtr << "-" << Info.AnonSymbol;
1055 O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(";
1056 O << Info.LazyPtr << "-" << Info.AnonSymbol << ")(r11)\n";
1057 O << "\tmtctr r12\n";
1060 OutStreamer.SwitchSection(LSPSection);
1061 O << Info.LazyPtr << ":\n";
1062 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1063 O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
1065 } else if (!FnStubs.empty()) {
1066 const MCSection *StubSection =
1067 TLOFMacho.getMachOSection("__TEXT","__symbol_stub1",
1068 MCSectionMachO::S_SYMBOL_STUBS |
1069 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
1070 16, SectionKind::getText());
1072 for (StringMap<FnStubInfo>::iterator I = FnStubs.begin(), E = FnStubs.end();
1074 OutStreamer.SwitchSection(StubSection);
1076 const FnStubInfo &Info = I->second;
1077 O << Info.Stub << ":\n";
1078 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1079 O << "\tlis r11,ha16(" << Info.LazyPtr << ")\n";
1080 O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(";
1081 O << Info.LazyPtr << ")(r11)\n";
1082 O << "\tmtctr r12\n";
1084 OutStreamer.SwitchSection(LSPSection);
1085 O << Info.LazyPtr << ":\n";
1086 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1087 O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
1093 if (MAI->doesSupportExceptionHandling() && MMI) {
1094 // Add the (possibly multiple) personalities to the set of global values.
1095 // Only referenced functions get into the Personalities list.
1096 const std::vector<Function *> &Personalities = MMI->getPersonalities();
1097 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1098 E = Personalities.end(); I != E; ++I) {
1100 GVStubs[Mang->getMangledName(*I)] =
1101 Mang->getMangledName(*I, "$non_lazy_ptr", true);
1105 // Output macho stubs for external and common global variables.
1106 if (!GVStubs.empty()) {
1107 // Switch with ".non_lazy_symbol_pointer" directive.
1108 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1109 EmitAlignment(isPPC64 ? 3 : 2);
1111 for (StringMap<std::string>::iterator I = GVStubs.begin(),
1112 E = GVStubs.end(); I != E; ++I) {
1113 O << I->second << ":\n";
1114 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1115 O << (isPPC64 ? "\t.quad\t0\n" : "\t.long\t0\n");
1119 if (!HiddenGVStubs.empty()) {
1120 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1121 EmitAlignment(isPPC64 ? 3 : 2);
1122 for (StringMap<std::string>::iterator I = HiddenGVStubs.begin(),
1123 E = HiddenGVStubs.end(); I != E; ++I) {
1124 O << I->second << ":\n";
1125 O << (isPPC64 ? "\t.quad\t" : "\t.long\t") << I->getKeyData() << '\n';
1129 // Funny Darwin hack: This flag tells the linker that no global symbols
1130 // contain code that falls through to other global symbols (e.g. the obvious
1131 // implementation of multiple entry points). If this doesn't occur, the
1132 // linker can safely perform dead code stripping. Since LLVM never generates
1133 // code that does this, it is always safe to set.
1134 OutStreamer.EmitAssemblerFlag(MCStreamer::SubsectionsViaSymbols);
1136 return AsmPrinter::doFinalization(M);
1141 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1142 /// for a MachineFunction to the given output stream, in a format that the
1143 /// Darwin assembler can deal with.
1145 static AsmPrinter *createPPCAsmPrinterPass(formatted_raw_ostream &o,
1147 const MCAsmInfo *tai,
1149 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1151 if (Subtarget->isDarwin())
1152 return new PPCDarwinAsmPrinter(o, tm, tai, verbose);
1153 return new PPCLinuxAsmPrinter(o, tm, tai, verbose);
1156 // Force static initialization.
1157 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1158 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1159 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);