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/Analysis/DebugInfo.h"
25 #include "llvm/Constants.h"
26 #include "llvm/DerivedTypes.h"
27 #include "llvm/Module.h"
28 #include "llvm/Assembly/Writer.h"
29 #include "llvm/CodeGen/AsmPrinter.h"
30 #include "llvm/CodeGen/MachineFunctionPass.h"
31 #include "llvm/CodeGen/MachineInstr.h"
32 #include "llvm/CodeGen/MachineInstrBuilder.h"
33 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
34 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
35 #include "llvm/MC/MCAsmInfo.h"
36 #include "llvm/MC/MCContext.h"
37 #include "llvm/MC/MCExpr.h"
38 #include "llvm/MC/MCInst.h"
39 #include "llvm/MC/MCSectionMachO.h"
40 #include "llvm/MC/MCStreamer.h"
41 #include "llvm/MC/MCSymbol.h"
42 #include "llvm/Target/Mangler.h"
43 #include "llvm/Target/TargetRegisterInfo.h"
44 #include "llvm/Target/TargetInstrInfo.h"
45 #include "llvm/Target/TargetOptions.h"
46 #include "llvm/Target/TargetRegistry.h"
47 #include "llvm/Support/CommandLine.h"
48 #include "llvm/Support/Debug.h"
49 #include "llvm/Support/MathExtras.h"
50 #include "llvm/Support/ErrorHandling.h"
51 #include "llvm/Support/raw_ostream.h"
52 #include "llvm/ADT/StringExtras.h"
53 #include "llvm/ADT/StringSet.h"
54 #include "llvm/ADT/SmallString.h"
55 #include "InstPrinter/PPCInstPrinter.h"
58 // This option tells the asmprinter to use the new (experimental) MCInstPrinter
60 static cl::opt<bool> UseInstPrinter("enable-ppc-inst-printer",
66 class PPCAsmPrinter : public AsmPrinter {
68 DenseMap<MCSymbol*, MCSymbol*> TOC;
69 const PPCSubtarget &Subtarget;
72 explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
73 : AsmPrinter(TM, Streamer),
74 Subtarget(TM.getSubtarget<PPCSubtarget>()), LabelID(0) {}
76 virtual const char *getPassName() const {
77 return "PowerPC Assembly Printer";
80 unsigned enumRegToMachineReg(unsigned enumReg) {
82 default: llvm_unreachable("Unhandled register!");
83 case PPC::CR0: return 0;
84 case PPC::CR1: return 1;
85 case PPC::CR2: return 2;
86 case PPC::CR3: return 3;
87 case PPC::CR4: return 4;
88 case PPC::CR5: return 5;
89 case PPC::CR6: return 6;
90 case PPC::CR7: return 7;
95 /// printInstruction - This method is automatically generated by tablegen
96 /// from the instruction set description. This method returns true if the
97 /// machine instruction was sufficiently described to print it, otherwise it
99 void printInstruction(const MachineInstr *MI, raw_ostream &O);
100 static const char *getRegisterName(unsigned RegNo);
103 virtual void EmitInstruction(const MachineInstr *MI);
104 void printOp(const MachineOperand &MO, raw_ostream &O);
106 /// stripRegisterPrefix - This method strips the character prefix from a
107 /// register name so that only the number is left. Used by for linux asm.
108 const char *stripRegisterPrefix(const char *RegName) {
109 switch (RegName[0]) {
112 case 'v': return RegName + 1;
113 case 'c': if (RegName[1] == 'r') return RegName + 2;
119 /// printRegister - Print register according to target requirements.
121 void printRegister(const MachineOperand &MO, bool R0AsZero, raw_ostream &O){
122 unsigned RegNo = MO.getReg();
123 assert(TargetRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??");
125 // If we should use 0 for R0.
126 if (R0AsZero && RegNo == PPC::R0) {
131 const char *RegName = getRegisterName(RegNo);
132 // Linux assembler (Others?) does not take register mnemonics.
133 // FIXME - What about special registers used in mfspr/mtspr?
134 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
138 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
139 const MachineOperand &MO = MI->getOperand(OpNo);
141 printRegister(MO, false, O);
142 } else if (MO.isImm()) {
149 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
150 unsigned AsmVariant, const char *ExtraCode,
152 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
153 unsigned AsmVariant, const char *ExtraCode,
157 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo,
159 char value = MI->getOperand(OpNo).getImm();
160 value = (value << (32-5)) >> (32-5);
163 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo,
165 unsigned char value = MI->getOperand(OpNo).getImm();
166 assert(value <= 31 && "Invalid u5imm argument!");
167 O << (unsigned int)value;
169 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo,
171 unsigned char value = MI->getOperand(OpNo).getImm();
172 assert(value <= 63 && "Invalid u6imm argument!");
173 O << (unsigned int)value;
175 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo,
177 O << (short)MI->getOperand(OpNo).getImm();
179 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo,
181 O << (unsigned short)MI->getOperand(OpNo).getImm();
183 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo,
185 if (MI->getOperand(OpNo).isImm()) {
186 O << (short)(MI->getOperand(OpNo).getImm()*4);
189 printOp(MI->getOperand(OpNo), O);
190 if (TM.getRelocationModel() == Reloc::PIC_)
191 O << "-\"L" << getFunctionNumber() << "$pb\")";
196 void printBranchOperand(const MachineInstr *MI, unsigned OpNo,
198 // Branches can take an immediate operand. This is used by the branch
199 // selection pass to print $+8, an eight byte displacement from the PC.
200 if (MI->getOperand(OpNo).isImm()) {
201 O << "$+" << MI->getOperand(OpNo).getImm()*4;
203 printOp(MI->getOperand(OpNo), O);
206 void printCallOperand(const MachineInstr *MI, unsigned OpNo,
208 const MachineOperand &MO = MI->getOperand(OpNo);
209 if (TM.getRelocationModel() != Reloc::Static) {
211 const GlobalValue *GV = MO.getGlobal();
212 if (GV->isDeclaration() || GV->isWeakForLinker()) {
213 // Dynamically-resolved functions need a stub for the function.
214 MCSymbol *Sym = GetSymbolWithGlobalValueBase(GV, "$stub");
215 MachineModuleInfoImpl::StubValueTy &StubSym =
216 MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
217 if (StubSym.getPointer() == 0)
218 StubSym = MachineModuleInfoImpl::
219 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
225 SmallString<128> TempNameStr;
226 TempNameStr += StringRef(MO.getSymbolName());
227 TempNameStr += StringRef("$stub");
229 MCSymbol *Sym = GetExternalSymbolSymbol(TempNameStr.str());
230 MachineModuleInfoImpl::StubValueTy &StubSym =
231 MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym);
232 if (StubSym.getPointer() == 0)
233 StubSym = MachineModuleInfoImpl::
234 StubValueTy(GetExternalSymbolSymbol(MO.getSymbolName()), true);
240 printOp(MI->getOperand(OpNo), O);
242 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo,
244 O << (int)MI->getOperand(OpNo).getImm()*4;
246 void printPICLabel(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
247 O << "\"L" << getFunctionNumber() << "$pb\"\n";
248 O << "\"L" << getFunctionNumber() << "$pb\":";
250 void printSymbolHi(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
251 if (MI->getOperand(OpNo).isImm()) {
252 printS16ImmOperand(MI, OpNo, O);
254 if (Subtarget.isDarwin()) O << "ha16(";
255 printOp(MI->getOperand(OpNo), O);
256 if (TM.getRelocationModel() == Reloc::PIC_)
257 O << "-\"L" << getFunctionNumber() << "$pb\"";
258 if (Subtarget.isDarwin())
264 void printSymbolLo(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
265 if (MI->getOperand(OpNo).isImm()) {
266 printS16ImmOperand(MI, OpNo, O);
268 if (Subtarget.isDarwin()) O << "lo16(";
269 printOp(MI->getOperand(OpNo), O);
270 if (TM.getRelocationModel() == Reloc::PIC_)
271 O << "-\"L" << getFunctionNumber() << "$pb\"";
272 if (Subtarget.isDarwin())
278 void printcrbitm(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
279 unsigned CCReg = MI->getOperand(OpNo).getReg();
280 unsigned RegNo = enumRegToMachineReg(CCReg);
281 O << (0x80 >> RegNo);
283 // The new addressing mode printers.
284 void printMemRegImm(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
285 printSymbolLo(MI, OpNo, O);
287 if (MI->getOperand(OpNo+1).isReg() &&
288 MI->getOperand(OpNo+1).getReg() == PPC::R0)
291 printOperand(MI, OpNo+1, O);
294 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo,
296 if (MI->getOperand(OpNo).isImm())
297 printS16X4ImmOperand(MI, OpNo, O);
299 printSymbolLo(MI, OpNo, O);
301 if (MI->getOperand(OpNo+1).isReg() &&
302 MI->getOperand(OpNo+1).getReg() == PPC::R0)
305 printOperand(MI, OpNo+1, O);
309 void printMemRegReg(const MachineInstr *MI, unsigned OpNo, raw_ostream &O) {
310 // When used as the base register, r0 reads constant zero rather than
311 // the value contained in the register. For this reason, the darwin
312 // assembler requires that we print r0 as 0 (no r) when used as the base.
313 const MachineOperand &MO = MI->getOperand(OpNo);
314 printRegister(MO, true, O);
316 printOperand(MI, OpNo+1, O);
319 void printTOCEntryLabel(const MachineInstr *MI, unsigned OpNo,
321 const MachineOperand &MO = MI->getOperand(OpNo);
322 assert(MO.isGlobal());
323 MCSymbol *Sym = Mang->getSymbol(MO.getGlobal());
325 // Map symbol -> label of TOC entry.
326 MCSymbol *&TOCEntry = TOC[Sym];
328 TOCEntry = OutContext.
329 GetOrCreateSymbol(StringRef(MAI->getPrivateGlobalPrefix()) +
330 "C" + Twine(LabelID++));
332 O << *TOCEntry << "@toc";
335 void printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
336 raw_ostream &O, const char *Modifier);
338 MachineLocation getDebugValueLocation(const MachineInstr *MI) const {
340 MachineLocation Location;
341 assert (MI->getNumOperands() == 4 && "Invalid no. of machine operands!");
342 // Frame address. Currently handles register +- offset only.
343 if (MI->getOperand(0).isReg() && MI->getOperand(2).isImm())
344 Location.set(MI->getOperand(0).getReg(), MI->getOperand(2).getImm());
346 DEBUG(dbgs() << "DBG_VALUE instruction ignored! " << *MI << "\n");
352 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
353 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
355 explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
356 : PPCAsmPrinter(TM, Streamer) {}
358 virtual const char *getPassName() const {
359 return "Linux PPC Assembly Printer";
362 bool doFinalization(Module &M);
364 virtual void EmitFunctionEntryLabel();
367 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
369 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
371 explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
372 : PPCAsmPrinter(TM, Streamer) {}
374 virtual const char *getPassName() const {
375 return "Darwin PPC Assembly Printer";
378 bool doFinalization(Module &M);
379 void EmitStartOfAsmFile(Module &M);
381 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
383 } // end of anonymous namespace
385 // Include the auto-generated portion of the assembly writer
386 #include "PPCGenAsmWriter.inc"
388 void PPCAsmPrinter::printOp(const MachineOperand &MO, raw_ostream &O) {
389 switch (MO.getType()) {
390 case MachineOperand::MO_Immediate:
391 llvm_unreachable("printOp() does not handle immediate values");
393 case MachineOperand::MO_MachineBasicBlock:
394 O << *MO.getMBB()->getSymbol();
396 case MachineOperand::MO_JumpTableIndex:
397 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
398 << '_' << MO.getIndex();
399 // FIXME: PIC relocation model
401 case MachineOperand::MO_ConstantPoolIndex:
402 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
403 << '_' << MO.getIndex();
405 case MachineOperand::MO_BlockAddress:
406 O << *GetBlockAddressSymbol(MO.getBlockAddress());
408 case MachineOperand::MO_ExternalSymbol: {
409 // Computing the address of an external symbol, not calling it.
410 if (TM.getRelocationModel() == Reloc::Static) {
411 O << *GetExternalSymbolSymbol(MO.getSymbolName());
416 OutContext.GetOrCreateSymbol(StringRef(MAI->getGlobalPrefix())+
417 MO.getSymbolName()+"$non_lazy_ptr");
418 MachineModuleInfoImpl::StubValueTy &StubSym =
419 MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(NLPSym);
420 if (StubSym.getPointer() == 0)
421 StubSym = MachineModuleInfoImpl::
422 StubValueTy(GetExternalSymbolSymbol(MO.getSymbolName()), true);
427 case MachineOperand::MO_GlobalAddress: {
428 // Computing the address of a global symbol, not calling it.
429 const GlobalValue *GV = MO.getGlobal();
430 MCSymbol *SymToPrint;
432 // External or weakly linked global variables need non-lazily-resolved stubs
433 if (TM.getRelocationModel() != Reloc::Static &&
434 (GV->isDeclaration() || GV->isWeakForLinker())) {
435 if (!GV->hasHiddenVisibility()) {
436 SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
437 MachineModuleInfoImpl::StubValueTy &StubSym =
438 MMI->getObjFileInfo<MachineModuleInfoMachO>()
439 .getGVStubEntry(SymToPrint);
440 if (StubSym.getPointer() == 0)
441 StubSym = MachineModuleInfoImpl::
442 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
443 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
444 GV->hasAvailableExternallyLinkage()) {
445 SymToPrint = GetSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
447 MachineModuleInfoImpl::StubValueTy &StubSym =
448 MMI->getObjFileInfo<MachineModuleInfoMachO>().
449 getHiddenGVStubEntry(SymToPrint);
450 if (StubSym.getPointer() == 0)
451 StubSym = MachineModuleInfoImpl::
452 StubValueTy(Mang->getSymbol(GV), !GV->hasInternalLinkage());
454 SymToPrint = Mang->getSymbol(GV);
457 SymToPrint = Mang->getSymbol(GV);
462 printOffset(MO.getOffset(), O);
467 O << "<unknown operand type: " << MO.getType() << ">";
472 /// PrintAsmOperand - Print out an operand for an inline asm expression.
474 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
476 const char *ExtraCode, raw_ostream &O) {
477 // Does this asm operand have a single letter operand modifier?
478 if (ExtraCode && ExtraCode[0]) {
479 if (ExtraCode[1] != 0) return true; // Unknown modifier.
481 switch (ExtraCode[0]) {
482 default: return true; // Unknown modifier.
483 case 'c': // Don't print "$" before a global var name or constant.
484 // PPC never has a prefix.
485 printOperand(MI, OpNo, O);
487 case 'L': // Write second word of DImode reference.
488 // Verify that this operand has two consecutive registers.
489 if (!MI->getOperand(OpNo).isReg() ||
490 OpNo+1 == MI->getNumOperands() ||
491 !MI->getOperand(OpNo+1).isReg())
493 ++OpNo; // Return the high-part.
496 // Write 'i' if an integer constant, otherwise nothing. Used to print
498 if (MI->getOperand(OpNo).isImm())
504 printOperand(MI, OpNo, O);
508 // At the moment, all inline asm memory operands are a single register.
509 // In any case, the output of this routine should always be just one
510 // assembler operand.
512 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
514 const char *ExtraCode,
516 if (ExtraCode && ExtraCode[0])
517 return true; // Unknown modifier.
518 assert (MI->getOperand(OpNo).isReg());
520 printOperand(MI, OpNo, O);
525 void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
526 raw_ostream &O, const char *Modifier){
527 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
528 unsigned Code = MI->getOperand(OpNo).getImm();
529 if (!strcmp(Modifier, "cc")) {
530 switch ((PPC::Predicate)Code) {
531 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
532 case PPC::PRED_LT: O << "lt"; return;
533 case PPC::PRED_LE: O << "le"; return;
534 case PPC::PRED_EQ: O << "eq"; return;
535 case PPC::PRED_GE: O << "ge"; return;
536 case PPC::PRED_GT: O << "gt"; return;
537 case PPC::PRED_NE: O << "ne"; return;
538 case PPC::PRED_UN: O << "un"; return;
539 case PPC::PRED_NU: O << "nu"; return;
543 assert(!strcmp(Modifier, "reg") &&
544 "Need to specify 'cc' or 'reg' as predicate op modifier!");
545 // Don't print the register for 'always'.
546 if (Code == PPC::PRED_ALWAYS) return;
547 printOperand(MI, OpNo+1, O);
552 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
553 /// the current output stream.
555 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
556 if (UseInstPrinter) {
557 // Lower multi-instruction pseudo operations.
558 switch (MI->getOpcode()) {
560 // TODO: implement me.
564 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this);
565 OutStreamer.EmitInstruction(TmpInst);
570 SmallString<128> Str;
571 raw_svector_ostream O(Str);
573 if (MI->getOpcode() == TargetOpcode::DBG_VALUE) {
574 unsigned NOps = MI->getNumOperands();
576 O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
577 // cast away const; DIetc do not take const operands for some reason.
578 DIVariable V(const_cast<MDNode *>(MI->getOperand(NOps-1).getMetadata()));
581 // Frame address. Currently handles register +- offset only.
582 assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm());
583 O << '['; printOperand(MI, 0, O); O << '+'; printOperand(MI, 1, O);
586 printOperand(MI, NOps-2, O);
587 OutStreamer.EmitRawText(O.str());
590 // Check for slwi/srwi mnemonics.
591 if (MI->getOpcode() == PPC::RLWINM) {
592 unsigned char SH = MI->getOperand(2).getImm();
593 unsigned char MB = MI->getOperand(3).getImm();
594 unsigned char ME = MI->getOperand(4).getImm();
595 bool useSubstituteMnemonic = false;
596 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
597 O << "\tslwi "; useSubstituteMnemonic = true;
599 if (SH <= 31 && MB == (32-SH) && ME == 31) {
600 O << "\tsrwi "; useSubstituteMnemonic = true;
603 if (useSubstituteMnemonic) {
604 printOperand(MI, 0, O);
606 printOperand(MI, 1, O);
607 O << ", " << (unsigned int)SH;
608 OutStreamer.EmitRawText(O.str());
613 if ((MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) &&
614 MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
616 printOperand(MI, 0, O);
618 printOperand(MI, 1, O);
619 OutStreamer.EmitRawText(O.str());
623 if (MI->getOpcode() == PPC::RLDICR) {
624 unsigned char SH = MI->getOperand(2).getImm();
625 unsigned char ME = MI->getOperand(3).getImm();
626 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
629 printOperand(MI, 0, O);
631 printOperand(MI, 1, O);
632 O << ", " << (unsigned int)SH;
633 OutStreamer.EmitRawText(O.str());
638 printInstruction(MI, O);
639 OutStreamer.EmitRawText(O.str());
642 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
643 if (!Subtarget.isPPC64()) // linux/ppc32 - Normal entry label.
644 return AsmPrinter::EmitFunctionEntryLabel();
646 // Emit an official procedure descriptor.
647 // FIXME 64-bit SVR4: Use MCSection here!
648 OutStreamer.EmitRawText(StringRef("\t.section\t\".opd\",\"aw\""));
649 OutStreamer.EmitRawText(StringRef("\t.align 3"));
650 OutStreamer.EmitLabel(CurrentFnSym);
651 OutStreamer.EmitRawText("\t.quad .L." + Twine(CurrentFnSym->getName()) +
653 OutStreamer.EmitRawText(StringRef("\t.previous"));
654 OutStreamer.EmitRawText(".L." + Twine(CurrentFnSym->getName()) + ":");
658 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
659 const TargetData *TD = TM.getTargetData();
661 bool isPPC64 = TD->getPointerSizeInBits() == 64;
663 if (isPPC64 && !TOC.empty()) {
664 // FIXME 64-bit SVR4: Use MCSection here?
665 OutStreamer.EmitRawText(StringRef("\t.section\t\".toc\",\"aw\""));
667 // FIXME: This is nondeterminstic!
668 for (DenseMap<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
669 E = TOC.end(); I != E; ++I) {
670 OutStreamer.EmitLabel(I->second);
671 OutStreamer.EmitRawText("\t.tc " + Twine(I->first->getName()) +
672 "[TC]," + I->first->getName());
676 return AsmPrinter::doFinalization(M);
679 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
680 static const char *const CPUDirectives[] = {
692 unsigned Directive = Subtarget.getDarwinDirective();
693 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
694 Directive = PPC::DIR_970;
695 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
696 Directive = PPC::DIR_7400;
697 if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
698 Directive = PPC::DIR_64;
699 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
700 OutStreamer.EmitRawText("\t.machine " + Twine(CPUDirectives[Directive]));
702 // Prime text sections so they are adjacent. This reduces the likelihood a
703 // large data or debug section causes a branch to exceed 16M limit.
704 const TargetLoweringObjectFileMachO &TLOFMacho =
705 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
706 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
707 if (TM.getRelocationModel() == Reloc::PIC_) {
708 OutStreamer.SwitchSection(
709 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
710 MCSectionMachO::S_SYMBOL_STUBS |
711 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
712 32, SectionKind::getText()));
713 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
714 OutStreamer.SwitchSection(
715 OutContext.getMachOSection("__TEXT","__symbol_stub1",
716 MCSectionMachO::S_SYMBOL_STUBS |
717 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
718 16, SectionKind::getText()));
720 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
723 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
724 // Remove $stub suffix, add $lazy_ptr.
725 SmallString<128> TmpStr(Sym->getName().begin(), Sym->getName().end()-5);
726 TmpStr += "$lazy_ptr";
727 return Ctx.GetOrCreateSymbol(TmpStr.str());
730 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
731 // Add $tmp suffix to $stub, yielding $stub$tmp.
732 SmallString<128> TmpStr(Sym->getName().begin(), Sym->getName().end());
734 return Ctx.GetOrCreateSymbol(TmpStr.str());
737 void PPCDarwinAsmPrinter::
738 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
739 bool isPPC64 = TM.getTargetData()->getPointerSizeInBits() == 64;
741 const TargetLoweringObjectFileMachO &TLOFMacho =
742 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
744 // .lazy_symbol_pointer
745 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
747 // Output stubs for dynamically-linked functions
748 if (TM.getRelocationModel() == Reloc::PIC_) {
749 const MCSection *StubSection =
750 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
751 MCSectionMachO::S_SYMBOL_STUBS |
752 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
753 32, SectionKind::getText());
754 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
755 OutStreamer.SwitchSection(StubSection);
758 MCSymbol *Stub = Stubs[i].first;
759 MCSymbol *RawSym = Stubs[i].second.getPointer();
760 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
761 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
763 OutStreamer.EmitLabel(Stub);
764 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
765 // FIXME: MCize this.
766 OutStreamer.EmitRawText(StringRef("\tmflr r0"));
767 OutStreamer.EmitRawText("\tbcl 20,31," + Twine(AnonSymbol->getName()));
768 OutStreamer.EmitLabel(AnonSymbol);
769 OutStreamer.EmitRawText(StringRef("\tmflr r11"));
770 OutStreamer.EmitRawText("\taddis r11,r11,ha16("+Twine(LazyPtr->getName())+
771 "-" + AnonSymbol->getName() + ")");
772 OutStreamer.EmitRawText(StringRef("\tmtlr r0"));
775 OutStreamer.EmitRawText("\tldu r12,lo16(" + Twine(LazyPtr->getName()) +
776 "-" + AnonSymbol->getName() + ")(r11)");
778 OutStreamer.EmitRawText("\tlwzu r12,lo16(" + Twine(LazyPtr->getName()) +
779 "-" + AnonSymbol->getName() + ")(r11)");
780 OutStreamer.EmitRawText(StringRef("\tmtctr r12"));
781 OutStreamer.EmitRawText(StringRef("\tbctr"));
783 OutStreamer.SwitchSection(LSPSection);
784 OutStreamer.EmitLabel(LazyPtr);
785 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
788 OutStreamer.EmitRawText(StringRef("\t.quad dyld_stub_binding_helper"));
790 OutStreamer.EmitRawText(StringRef("\t.long dyld_stub_binding_helper"));
792 OutStreamer.AddBlankLine();
796 const MCSection *StubSection =
797 OutContext.getMachOSection("__TEXT","__symbol_stub1",
798 MCSectionMachO::S_SYMBOL_STUBS |
799 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
800 16, SectionKind::getText());
801 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
802 MCSymbol *Stub = Stubs[i].first;
803 MCSymbol *RawSym = Stubs[i].second.getPointer();
804 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
806 OutStreamer.SwitchSection(StubSection);
808 OutStreamer.EmitLabel(Stub);
809 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
810 OutStreamer.EmitRawText("\tlis r11,ha16(" + Twine(LazyPtr->getName()) +")");
812 OutStreamer.EmitRawText("\tldu r12,lo16(" + Twine(LazyPtr->getName()) +
815 OutStreamer.EmitRawText("\tlwzu r12,lo16(" + Twine(LazyPtr->getName()) +
817 OutStreamer.EmitRawText(StringRef("\tmtctr r12"));
818 OutStreamer.EmitRawText(StringRef("\tbctr"));
819 OutStreamer.SwitchSection(LSPSection);
820 OutStreamer.EmitLabel(LazyPtr);
821 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
824 OutStreamer.EmitRawText(StringRef("\t.quad dyld_stub_binding_helper"));
826 OutStreamer.EmitRawText(StringRef("\t.long dyld_stub_binding_helper"));
829 OutStreamer.AddBlankLine();
833 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
834 bool isPPC64 = TM.getTargetData()->getPointerSizeInBits() == 64;
836 // Darwin/PPC always uses mach-o.
837 const TargetLoweringObjectFileMachO &TLOFMacho =
838 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
839 MachineModuleInfoMachO &MMIMacho =
840 MMI->getObjFileInfo<MachineModuleInfoMachO>();
842 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
844 EmitFunctionStubs(Stubs);
846 if (MAI->doesSupportExceptionHandling() && MMI) {
847 // Add the (possibly multiple) personalities to the set of global values.
848 // Only referenced functions get into the Personalities list.
849 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
850 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
851 E = Personalities.end(); I != E; ++I) {
853 MCSymbol *NLPSym = GetSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
854 MachineModuleInfoImpl::StubValueTy &StubSym =
855 MMIMacho.getGVStubEntry(NLPSym);
856 StubSym = MachineModuleInfoImpl::StubValueTy(Mang->getSymbol(*I), true);
861 // Output stubs for dynamically-linked functions.
862 Stubs = MMIMacho.GetGVStubList();
864 // Output macho stubs for external and common global variables.
865 if (!Stubs.empty()) {
866 // Switch with ".non_lazy_symbol_pointer" directive.
867 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
868 EmitAlignment(isPPC64 ? 3 : 2);
870 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
872 OutStreamer.EmitLabel(Stubs[i].first);
873 // .indirect_symbol _foo
874 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
875 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
878 // External to current translation unit.
879 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
881 // Internal to current translation unit.
883 // When we place the LSDA into the TEXT section, the type info pointers
884 // need to be indirect and pc-rel. We accomplish this by using NLPs.
885 // However, sometimes the types are local to the file. So we need to
886 // fill in the value for the NLP in those cases.
887 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
889 isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
893 OutStreamer.AddBlankLine();
896 Stubs = MMIMacho.GetHiddenGVStubList();
897 if (!Stubs.empty()) {
898 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
899 EmitAlignment(isPPC64 ? 3 : 2);
901 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
903 OutStreamer.EmitLabel(Stubs[i].first);
905 OutStreamer.EmitValue(MCSymbolRefExpr::
906 Create(Stubs[i].second.getPointer(),
908 isPPC64 ? 8 : 4/*size*/, 0/*addrspace*/);
912 OutStreamer.AddBlankLine();
915 // Funny Darwin hack: This flag tells the linker that no global symbols
916 // contain code that falls through to other global symbols (e.g. the obvious
917 // implementation of multiple entry points). If this doesn't occur, the
918 // linker can safely perform dead code stripping. Since LLVM never generates
919 // code that does this, it is always safe to set.
920 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
922 return AsmPrinter::doFinalization(M);
925 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
926 /// for a MachineFunction to the given output stream, in a format that the
927 /// Darwin assembler can deal with.
929 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
930 MCStreamer &Streamer) {
931 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
933 if (Subtarget->isDarwin())
934 return new PPCDarwinAsmPrinter(tm, Streamer);
935 return new PPCLinuxAsmPrinter(tm, Streamer);
938 static MCInstPrinter *createPPCMCInstPrinter(const Target &T,
939 unsigned SyntaxVariant,
940 const MCAsmInfo &MAI) {
941 return new PPCInstPrinter(MAI, SyntaxVariant);
945 // Force static initialization.
946 extern "C" void LLVMInitializePowerPCAsmPrinter() {
947 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
948 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
950 TargetRegistry::RegisterMCInstPrinter(ThePPC32Target, createPPCMCInstPrinter);
951 TargetRegistry::RegisterMCInstPrinter(ThePPC64Target, createPPCMCInstPrinter);