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_ExternalSymbol: {
418 // Computing the address of an external symbol, not calling it.
419 std::string Name(MAI->getGlobalPrefix());
420 Name += MO.getSymbolName();
422 if (TM.getRelocationModel() != Reloc::Static) {
423 GVStubs[Name] = Name+"$non_lazy_ptr";
424 Name += "$non_lazy_ptr";
429 case MachineOperand::MO_GlobalAddress: {
430 // Computing the address of a global symbol, not calling it.
431 GlobalValue *GV = MO.getGlobal();
434 // External or weakly linked global variables need non-lazily-resolved stubs
435 if (TM.getRelocationModel() != Reloc::Static &&
436 (GV->isDeclaration() || GV->isWeakForLinker())) {
437 if (!GV->hasHiddenVisibility()) {
438 Name = Mang->getMangledName(GV, "$non_lazy_ptr", true);
439 GVStubs[Mang->getMangledName(GV)] = Name;
440 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
441 GV->hasAvailableExternallyLinkage()) {
442 Name = Mang->getMangledName(GV, "$non_lazy_ptr", true);
443 HiddenGVStubs[Mang->getMangledName(GV)] = Name;
445 Name = Mang->getMangledName(GV);
448 Name = Mang->getMangledName(GV);
452 printOffset(MO.getOffset());
457 O << "<unknown operand type: " << MO.getType() << ">";
462 /// PrintAsmOperand - Print out an operand for an inline asm expression.
464 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
466 const char *ExtraCode) {
467 // Does this asm operand have a single letter operand modifier?
468 if (ExtraCode && ExtraCode[0]) {
469 if (ExtraCode[1] != 0) return true; // Unknown modifier.
471 switch (ExtraCode[0]) {
472 default: return true; // Unknown modifier.
473 case 'c': // Don't print "$" before a global var name or constant.
474 // PPC never has a prefix.
475 printOperand(MI, OpNo);
477 case 'L': // Write second word of DImode reference.
478 // Verify that this operand has two consecutive registers.
479 if (!MI->getOperand(OpNo).isReg() ||
480 OpNo+1 == MI->getNumOperands() ||
481 !MI->getOperand(OpNo+1).isReg())
483 ++OpNo; // Return the high-part.
486 // Write 'i' if an integer constant, otherwise nothing. Used to print
488 if (MI->getOperand(OpNo).isImm())
494 printOperand(MI, OpNo);
498 // At the moment, all inline asm memory operands are a single register.
499 // In any case, the output of this routine should always be just one
500 // assembler operand.
502 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
504 const char *ExtraCode) {
505 if (ExtraCode && ExtraCode[0])
506 return true; // Unknown modifier.
507 assert (MI->getOperand(OpNo).isReg());
509 printOperand(MI, OpNo);
514 void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
515 const char *Modifier) {
516 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
517 unsigned Code = MI->getOperand(OpNo).getImm();
518 if (!strcmp(Modifier, "cc")) {
519 switch ((PPC::Predicate)Code) {
520 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
521 case PPC::PRED_LT: O << "lt"; return;
522 case PPC::PRED_LE: O << "le"; return;
523 case PPC::PRED_EQ: O << "eq"; return;
524 case PPC::PRED_GE: O << "ge"; return;
525 case PPC::PRED_GT: O << "gt"; return;
526 case PPC::PRED_NE: O << "ne"; return;
527 case PPC::PRED_UN: O << "un"; return;
528 case PPC::PRED_NU: O << "nu"; return;
532 assert(!strcmp(Modifier, "reg") &&
533 "Need to specify 'cc' or 'reg' as predicate op modifier!");
534 // Don't print the register for 'always'.
535 if (Code == PPC::PRED_ALWAYS) return;
536 printOperand(MI, OpNo+1);
541 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
542 /// the current output stream.
544 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
547 processDebugLoc(MI, true);
549 // Check for slwi/srwi mnemonics.
550 if (MI->getOpcode() == PPC::RLWINM) {
551 bool FoundMnemonic = false;
552 unsigned char SH = MI->getOperand(2).getImm();
553 unsigned char MB = MI->getOperand(3).getImm();
554 unsigned char ME = MI->getOperand(4).getImm();
555 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
556 O << "\tslwi "; FoundMnemonic = true;
558 if (SH <= 31 && MB == (32-SH) && ME == 31) {
559 O << "\tsrwi "; FoundMnemonic = true;
566 O << ", " << (unsigned int)SH << '\n';
569 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
570 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
578 } else if (MI->getOpcode() == PPC::RLDICR) {
579 unsigned char SH = MI->getOperand(2).getImm();
580 unsigned char ME = MI->getOperand(3).getImm();
581 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
587 O << ", " << (unsigned int)SH << '\n';
592 printInstruction(MI);
594 if (VerboseAsm && !MI->getDebugLoc().isUnknown())
598 processDebugLoc(MI, false);
601 /// runOnMachineFunction - This uses the printMachineInstruction()
602 /// method to print assembly for each instruction.
604 bool PPCLinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
607 SetupMachineFunction(MF);
610 // Print out constants referenced by the function
611 EmitConstantPool(MF.getConstantPool());
613 // Print out labels for the function.
614 const Function *F = MF.getFunction();
615 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
617 switch (F->getLinkage()) {
618 default: llvm_unreachable("Unknown linkage type!");
619 case Function::PrivateLinkage:
620 case Function::InternalLinkage: // Symbols default to internal.
622 case Function::ExternalLinkage:
623 O << "\t.global\t" << CurrentFnName << '\n'
624 << "\t.type\t" << CurrentFnName << ", @function\n";
626 case Function::LinkerPrivateLinkage:
627 case Function::WeakAnyLinkage:
628 case Function::WeakODRLinkage:
629 case Function::LinkOnceAnyLinkage:
630 case Function::LinkOnceODRLinkage:
631 O << "\t.global\t" << CurrentFnName << '\n';
632 O << "\t.weak\t" << CurrentFnName << '\n';
636 printVisibility(CurrentFnName, F->getVisibility());
638 EmitAlignment(MF.getAlignment(), F);
640 if (Subtarget.isPPC64()) {
641 // Emit an official procedure descriptor.
642 // FIXME 64-bit SVR4: Use MCSection here?
643 O << "\t.section\t\".opd\",\"aw\"\n";
645 O << CurrentFnName << ":\n";
646 O << "\t.quad .L." << CurrentFnName << ",.TOC.@tocbase\n";
647 O << "\t.previous\n";
648 O << ".L." << CurrentFnName << ":\n";
650 O << CurrentFnName << ":\n";
653 // Emit pre-function debug information.
654 DW->BeginFunction(&MF);
656 // Print out code for the function.
657 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
659 // Print a label for the basic block.
660 if (I != MF.begin()) {
661 EmitBasicBlockStart(I);
663 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
665 // Print the assembly for the instruction.
666 printMachineInstruction(II);
670 O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << '\n';
672 // Print out jump tables referenced by the function.
673 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
675 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
677 // Emit post-function debug information.
678 DW->EndFunction(&MF);
680 // We didn't modify anything.
684 void PPCLinuxAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
685 const TargetData *TD = TM.getTargetData();
687 if (!GVar->hasInitializer())
688 return; // External global require no code
690 // Check to see if this is a special global used by LLVM, if so, emit it.
691 if (EmitSpecialLLVMGlobal(GVar))
694 std::string name = Mang->getMangledName(GVar);
696 printVisibility(name, GVar->getVisibility());
698 Constant *C = GVar->getInitializer();
699 const Type *Type = C->getType();
700 unsigned Size = TD->getTypeAllocSize(Type);
701 unsigned Align = TD->getPreferredAlignmentLog(GVar);
703 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GVar, Mang,
706 if (C->isNullValue() && /* FIXME: Verify correct */
707 !GVar->hasSection() &&
708 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
709 GVar->isWeakForLinker())) {
710 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
712 if (GVar->hasExternalLinkage()) {
713 O << "\t.global " << name << '\n';
714 O << "\t.type " << name << ", @object\n";
716 O << "\t.zero " << Size << '\n';
717 } else if (GVar->hasLocalLinkage()) {
718 O << MAI->getLCOMMDirective() << name << ',' << Size;
720 O << ".comm " << name << ',' << Size;
723 O << "\t\t" << MAI->getCommentString() << " '";
724 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
731 switch (GVar->getLinkage()) {
732 case GlobalValue::LinkOnceAnyLinkage:
733 case GlobalValue::LinkOnceODRLinkage:
734 case GlobalValue::WeakAnyLinkage:
735 case GlobalValue::WeakODRLinkage:
736 case GlobalValue::CommonLinkage:
737 case GlobalValue::LinkerPrivateLinkage:
738 O << "\t.global " << name << '\n'
739 << "\t.type " << name << ", @object\n"
740 << "\t.weak " << name << '\n';
742 case GlobalValue::AppendingLinkage:
743 // FIXME: appending linkage variables should go into a section of
744 // their name or something. For now, just emit them as external.
745 case GlobalValue::ExternalLinkage:
746 // If external or appending, declare as a global symbol
747 O << "\t.global " << name << '\n'
748 << "\t.type " << name << ", @object\n";
750 case GlobalValue::InternalLinkage:
751 case GlobalValue::PrivateLinkage:
754 llvm_unreachable("Unknown linkage type!");
757 EmitAlignment(Align, GVar);
760 O << "\t\t\t\t" << MAI->getCommentString() << " '";
761 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
766 EmitGlobalConstant(C);
770 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
771 const TargetData *TD = TM.getTargetData();
773 bool isPPC64 = TD->getPointerSizeInBits() == 64;
775 if (isPPC64 && !TOC.empty()) {
776 // FIXME 64-bit SVR4: Use MCSection here?
777 O << "\t.section\t\".toc\",\"aw\"\n";
779 for (StringMap<std::string>::iterator I = TOC.begin(), E = TOC.end();
781 O << I->second << ":\n";
782 O << "\t.tc " << I->getKeyData() << "[TC]," << I->getKeyData() << '\n';
786 return AsmPrinter::doFinalization(M);
789 /// runOnMachineFunction - This uses the printMachineInstruction()
790 /// method to print assembly for each instruction.
792 bool PPCDarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
795 SetupMachineFunction(MF);
798 // Print out constants referenced by the function
799 EmitConstantPool(MF.getConstantPool());
801 // Print out labels for the function.
802 const Function *F = MF.getFunction();
803 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
805 switch (F->getLinkage()) {
806 default: llvm_unreachable("Unknown linkage type!");
807 case Function::PrivateLinkage:
808 case Function::InternalLinkage: // Symbols default to internal.
810 case Function::ExternalLinkage:
811 O << "\t.globl\t" << CurrentFnName << '\n';
813 case Function::WeakAnyLinkage:
814 case Function::WeakODRLinkage:
815 case Function::LinkOnceAnyLinkage:
816 case Function::LinkOnceODRLinkage:
817 case Function::LinkerPrivateLinkage:
818 O << "\t.globl\t" << CurrentFnName << '\n';
819 O << "\t.weak_definition\t" << CurrentFnName << '\n';
823 printVisibility(CurrentFnName, F->getVisibility());
825 EmitAlignment(MF.getAlignment(), F);
826 O << CurrentFnName << ":\n";
828 // Emit pre-function debug information.
829 DW->BeginFunction(&MF);
831 // If the function is empty, then we need to emit *something*. Otherwise, the
832 // function's label might be associated with something that it wasn't meant to
833 // be associated with. We emit a noop in this situation.
834 MachineFunction::iterator I = MF.begin();
836 if (++I == MF.end() && MF.front().empty())
839 // Print out code for the function.
840 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
842 // Print a label for the basic block.
843 if (I != MF.begin()) {
844 EmitBasicBlockStart(I);
846 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
848 // Print the assembly for the instruction.
849 printMachineInstruction(II);
853 // Print out jump tables referenced by the function.
854 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
856 // Emit post-function debug information.
857 DW->EndFunction(&MF);
859 // We didn't modify anything.
864 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
865 static const char *const CPUDirectives[] = {
877 unsigned Directive = Subtarget.getDarwinDirective();
878 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
879 Directive = PPC::DIR_970;
880 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
881 Directive = PPC::DIR_7400;
882 if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
883 Directive = PPC::DIR_64;
884 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
885 O << "\t.machine " << CPUDirectives[Directive] << '\n';
887 // Prime text sections so they are adjacent. This reduces the likelihood a
888 // large data or debug section causes a branch to exceed 16M limit.
889 TargetLoweringObjectFileMachO &TLOFMacho =
890 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
891 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
892 if (TM.getRelocationModel() == Reloc::PIC_) {
893 OutStreamer.SwitchSection(
894 TLOFMacho.getMachOSection("__TEXT", "__picsymbolstub1",
895 MCSectionMachO::S_SYMBOL_STUBS |
896 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
897 32, SectionKind::getText()));
898 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
899 OutStreamer.SwitchSection(
900 TLOFMacho.getMachOSection("__TEXT","__symbol_stub1",
901 MCSectionMachO::S_SYMBOL_STUBS |
902 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
903 16, SectionKind::getText()));
905 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
908 void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
909 const TargetData *TD = TM.getTargetData();
911 if (!GVar->hasInitializer())
912 return; // External global require no code
914 // Check to see if this is a special global used by LLVM, if so, emit it.
915 if (EmitSpecialLLVMGlobal(GVar)) {
916 if (TM.getRelocationModel() == Reloc::Static) {
917 if (GVar->getName() == "llvm.global_ctors")
918 O << ".reference .constructors_used\n";
919 else if (GVar->getName() == "llvm.global_dtors")
920 O << ".reference .destructors_used\n";
925 std::string name = Mang->getMangledName(GVar);
926 printVisibility(name, GVar->getVisibility());
928 Constant *C = GVar->getInitializer();
929 const Type *Type = C->getType();
930 unsigned Size = TD->getTypeAllocSize(Type);
931 unsigned Align = TD->getPreferredAlignmentLog(GVar);
933 const MCSection *TheSection =
934 getObjFileLowering().SectionForGlobal(GVar, Mang, TM);
935 OutStreamer.SwitchSection(TheSection);
937 /// FIXME: Drive this off the section!
938 if (C->isNullValue() && /* FIXME: Verify correct */
939 !GVar->hasSection() &&
940 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
941 GVar->isWeakForLinker()) &&
942 // Don't put things that should go in the cstring section into "comm".
943 !TheSection->getKind().isMergeableCString()) {
944 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
946 if (GVar->hasExternalLinkage()) {
947 O << "\t.globl " << name << '\n';
948 O << "\t.zerofill __DATA, __common, " << name << ", "
949 << Size << ", " << Align;
950 } else if (GVar->hasLocalLinkage()) {
951 O << MAI->getLCOMMDirective() << name << ',' << Size << ',' << Align;
952 } else if (!GVar->hasCommonLinkage()) {
953 O << "\t.globl " << name << '\n'
954 << MAI->getWeakDefDirective() << name << '\n';
955 EmitAlignment(Align, GVar);
958 O << "\t\t\t\t" << MAI->getCommentString() << " ";
959 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
962 EmitGlobalConstant(C);
965 O << ".comm " << name << ',' << Size;
966 // Darwin 9 and above support aligned common data.
967 if (Subtarget.isDarwin9())
971 O << "\t\t" << MAI->getCommentString() << " '";
972 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
979 switch (GVar->getLinkage()) {
980 case GlobalValue::LinkOnceAnyLinkage:
981 case GlobalValue::LinkOnceODRLinkage:
982 case GlobalValue::WeakAnyLinkage:
983 case GlobalValue::WeakODRLinkage:
984 case GlobalValue::CommonLinkage:
985 case GlobalValue::LinkerPrivateLinkage:
986 O << "\t.globl " << name << '\n'
987 << "\t.weak_definition " << name << '\n';
989 case GlobalValue::AppendingLinkage:
990 // FIXME: appending linkage variables should go into a section of
991 // their name or something. For now, just emit them as external.
992 case GlobalValue::ExternalLinkage:
993 // If external or appending, declare as a global symbol
994 O << "\t.globl " << name << '\n';
996 case GlobalValue::InternalLinkage:
997 case GlobalValue::PrivateLinkage:
1000 llvm_unreachable("Unknown linkage type!");
1003 EmitAlignment(Align, GVar);
1006 O << "\t\t\t\t" << MAI->getCommentString() << " '";
1007 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
1012 EmitGlobalConstant(C);
1016 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1017 const TargetData *TD = TM.getTargetData();
1019 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1021 // Darwin/PPC always uses mach-o.
1022 TargetLoweringObjectFileMachO &TLOFMacho =
1023 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
1026 const MCSection *LSPSection = 0;
1027 if (!FnStubs.empty()) // .lazy_symbol_pointer
1028 LSPSection = TLOFMacho.getLazySymbolPointerSection();
1031 // Output stubs for dynamically-linked functions
1032 if (TM.getRelocationModel() == Reloc::PIC_ && !FnStubs.empty()) {
1033 const MCSection *StubSection =
1034 TLOFMacho.getMachOSection("__TEXT", "__picsymbolstub1",
1035 MCSectionMachO::S_SYMBOL_STUBS |
1036 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
1037 32, SectionKind::getText());
1038 for (StringMap<FnStubInfo>::iterator I = FnStubs.begin(), E = FnStubs.end();
1040 OutStreamer.SwitchSection(StubSection);
1042 const FnStubInfo &Info = I->second;
1043 O << Info.Stub << ":\n";
1044 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1046 O << "\tbcl 20,31," << Info.AnonSymbol << '\n';
1047 O << Info.AnonSymbol << ":\n";
1048 O << "\tmflr r11\n";
1049 O << "\taddis r11,r11,ha16(" << Info.LazyPtr << "-" << Info.AnonSymbol;
1052 O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(";
1053 O << Info.LazyPtr << "-" << Info.AnonSymbol << ")(r11)\n";
1054 O << "\tmtctr r12\n";
1057 OutStreamer.SwitchSection(LSPSection);
1058 O << Info.LazyPtr << ":\n";
1059 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1060 O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
1062 } else if (!FnStubs.empty()) {
1063 const MCSection *StubSection =
1064 TLOFMacho.getMachOSection("__TEXT","__symbol_stub1",
1065 MCSectionMachO::S_SYMBOL_STUBS |
1066 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
1067 16, SectionKind::getText());
1069 for (StringMap<FnStubInfo>::iterator I = FnStubs.begin(), E = FnStubs.end();
1071 OutStreamer.SwitchSection(StubSection);
1073 const FnStubInfo &Info = I->second;
1074 O << Info.Stub << ":\n";
1075 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1076 O << "\tlis r11,ha16(" << Info.LazyPtr << ")\n";
1077 O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(";
1078 O << Info.LazyPtr << ")(r11)\n";
1079 O << "\tmtctr r12\n";
1081 OutStreamer.SwitchSection(LSPSection);
1082 O << Info.LazyPtr << ":\n";
1083 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1084 O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
1090 if (MAI->doesSupportExceptionHandling() && MMI) {
1091 // Add the (possibly multiple) personalities to the set of global values.
1092 // Only referenced functions get into the Personalities list.
1093 const std::vector<Function *> &Personalities = MMI->getPersonalities();
1094 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1095 E = Personalities.end(); I != E; ++I) {
1097 GVStubs[Mang->getMangledName(*I)] =
1098 Mang->getMangledName(*I, "$non_lazy_ptr", true);
1102 // Output macho stubs for external and common global variables.
1103 if (!GVStubs.empty()) {
1104 // Switch with ".non_lazy_symbol_pointer" directive.
1105 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1106 EmitAlignment(isPPC64 ? 3 : 2);
1108 for (StringMap<std::string>::iterator I = GVStubs.begin(),
1109 E = GVStubs.end(); I != E; ++I) {
1110 O << I->second << ":\n";
1111 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1112 O << (isPPC64 ? "\t.quad\t0\n" : "\t.long\t0\n");
1116 if (!HiddenGVStubs.empty()) {
1117 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1118 EmitAlignment(isPPC64 ? 3 : 2);
1119 for (StringMap<std::string>::iterator I = HiddenGVStubs.begin(),
1120 E = HiddenGVStubs.end(); I != E; ++I) {
1121 O << I->second << ":\n";
1122 O << (isPPC64 ? "\t.quad\t" : "\t.long\t") << I->getKeyData() << '\n';
1126 // Funny Darwin hack: This flag tells the linker that no global symbols
1127 // contain code that falls through to other global symbols (e.g. the obvious
1128 // implementation of multiple entry points). If this doesn't occur, the
1129 // linker can safely perform dead code stripping. Since LLVM never generates
1130 // code that does this, it is always safe to set.
1131 OutStreamer.EmitAssemblerFlag(MCStreamer::SubsectionsViaSymbols);
1133 return AsmPrinter::doFinalization(M);
1138 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1139 /// for a MachineFunction to the given output stream, in a format that the
1140 /// Darwin assembler can deal with.
1142 static AsmPrinter *createPPCAsmPrinterPass(formatted_raw_ostream &o,
1144 const MCAsmInfo *tai,
1146 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1148 if (Subtarget->isDarwin())
1149 return new PPCDarwinAsmPrinter(o, tm, tai, verbose);
1150 return new PPCLinuxAsmPrinter(o, tm, tai, verbose);
1153 // Force static initialization.
1154 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1155 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1156 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);