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 //===----------------------------------------------------------------------===//
20 #include "InstPrinter/PPCInstPrinter.h"
21 #include "PPCMachineFunctionInfo.h"
22 #include "MCTargetDesc/PPCMCExpr.h"
23 #include "MCTargetDesc/PPCPredicates.h"
24 #include "PPCSubtarget.h"
25 #include "PPCTargetMachine.h"
26 #include "PPCTargetStreamer.h"
27 #include "llvm/ADT/MapVector.h"
28 #include "llvm/ADT/SmallString.h"
29 #include "llvm/ADT/StringExtras.h"
30 #include "llvm/CodeGen/AsmPrinter.h"
31 #include "llvm/CodeGen/MachineConstantPool.h"
32 #include "llvm/CodeGen/MachineFunctionPass.h"
33 #include "llvm/CodeGen/MachineInstr.h"
34 #include "llvm/CodeGen/MachineInstrBuilder.h"
35 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
36 #include "llvm/CodeGen/MachineRegisterInfo.h"
37 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
38 #include "llvm/IR/Constants.h"
39 #include "llvm/IR/DebugInfo.h"
40 #include "llvm/IR/DerivedTypes.h"
41 #include "llvm/IR/Mangler.h"
42 #include "llvm/IR/Module.h"
43 #include "llvm/MC/MCAsmInfo.h"
44 #include "llvm/MC/MCContext.h"
45 #include "llvm/MC/MCExpr.h"
46 #include "llvm/MC/MCInst.h"
47 #include "llvm/MC/MCInstBuilder.h"
48 #include "llvm/MC/MCSectionELF.h"
49 #include "llvm/MC/MCSectionMachO.h"
50 #include "llvm/MC/MCStreamer.h"
51 #include "llvm/MC/MCSymbol.h"
52 #include "llvm/Support/CommandLine.h"
53 #include "llvm/Support/Debug.h"
54 #include "llvm/Support/ELF.h"
55 #include "llvm/Support/ErrorHandling.h"
56 #include "llvm/Support/MathExtras.h"
57 #include "llvm/Support/TargetRegistry.h"
58 #include "llvm/Support/raw_ostream.h"
59 #include "llvm/Target/TargetInstrInfo.h"
60 #include "llvm/Target/TargetOptions.h"
61 #include "llvm/Target/TargetRegisterInfo.h"
64 #define DEBUG_TYPE "asmprinter"
67 class PPCAsmPrinter : public AsmPrinter {
69 MapVector<MCSymbol*, MCSymbol*> TOC;
70 const PPCSubtarget &Subtarget;
73 explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
74 : AsmPrinter(TM, Streamer),
75 Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
77 const char *getPassName() const override {
78 return "PowerPC Assembly Printer";
81 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
83 void EmitInstruction(const MachineInstr *MI) override;
85 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
87 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
88 unsigned AsmVariant, const char *ExtraCode,
89 raw_ostream &O) override;
90 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
91 unsigned AsmVariant, const char *ExtraCode,
92 raw_ostream &O) override;
95 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
96 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
98 explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
99 : PPCAsmPrinter(TM, Streamer) {}
101 const char *getPassName() const override {
102 return "Linux PPC Assembly Printer";
105 bool doFinalization(Module &M) override;
106 void EmitStartOfAsmFile(Module &M) override;
108 void EmitFunctionEntryLabel() override;
110 void EmitFunctionBodyStart() override;
111 void EmitFunctionBodyEnd() override;
114 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
116 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
118 explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
119 : PPCAsmPrinter(TM, Streamer) {}
121 const char *getPassName() const override {
122 return "Darwin PPC Assembly Printer";
125 bool doFinalization(Module &M) override;
126 void EmitStartOfAsmFile(Module &M) override;
128 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
130 } // end of anonymous namespace
132 /// stripRegisterPrefix - This method strips the character prefix from a
133 /// register name so that only the number is left. Used by for linux asm.
134 static const char *stripRegisterPrefix(const char *RegName) {
135 switch (RegName[0]) {
139 if (RegName[1] == 's')
142 case 'c': if (RegName[1] == 'r') return RegName + 2;
148 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
150 const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout();
151 const MachineOperand &MO = MI->getOperand(OpNo);
153 switch (MO.getType()) {
154 case MachineOperand::MO_Register: {
155 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
156 // Linux assembler (Others?) does not take register mnemonics.
157 // FIXME - What about special registers used in mfspr/mtspr?
158 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
162 case MachineOperand::MO_Immediate:
166 case MachineOperand::MO_MachineBasicBlock:
167 O << *MO.getMBB()->getSymbol();
169 case MachineOperand::MO_ConstantPoolIndex:
170 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
171 << '_' << MO.getIndex();
173 case MachineOperand::MO_BlockAddress:
174 O << *GetBlockAddressSymbol(MO.getBlockAddress());
176 case MachineOperand::MO_GlobalAddress: {
177 // Computing the address of a global symbol, not calling it.
178 const GlobalValue *GV = MO.getGlobal();
179 MCSymbol *SymToPrint;
181 // External or weakly linked global variables need non-lazily-resolved stubs
182 if (TM.getRelocationModel() != Reloc::Static &&
183 (GV->isDeclaration() || GV->isWeakForLinker())) {
184 if (!GV->hasHiddenVisibility()) {
185 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
186 MachineModuleInfoImpl::StubValueTy &StubSym =
187 MMI->getObjFileInfo<MachineModuleInfoMachO>()
188 .getGVStubEntry(SymToPrint);
189 if (!StubSym.getPointer())
190 StubSym = MachineModuleInfoImpl::
191 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
192 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
193 GV->hasAvailableExternallyLinkage()) {
194 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
196 MachineModuleInfoImpl::StubValueTy &StubSym =
197 MMI->getObjFileInfo<MachineModuleInfoMachO>().
198 getHiddenGVStubEntry(SymToPrint);
199 if (!StubSym.getPointer())
200 StubSym = MachineModuleInfoImpl::
201 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
203 SymToPrint = getSymbol(GV);
206 SymToPrint = getSymbol(GV);
211 printOffset(MO.getOffset(), O);
216 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
221 /// PrintAsmOperand - Print out an operand for an inline asm expression.
223 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
225 const char *ExtraCode, raw_ostream &O) {
226 // Does this asm operand have a single letter operand modifier?
227 if (ExtraCode && ExtraCode[0]) {
228 if (ExtraCode[1] != 0) return true; // Unknown modifier.
230 switch (ExtraCode[0]) {
232 // See if this is a generic print operand
233 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
234 case 'c': // Don't print "$" before a global var name or constant.
235 break; // PPC never has a prefix.
236 case 'L': // Write second word of DImode reference.
237 // Verify that this operand has two consecutive registers.
238 if (!MI->getOperand(OpNo).isReg() ||
239 OpNo+1 == MI->getNumOperands() ||
240 !MI->getOperand(OpNo+1).isReg())
242 ++OpNo; // Return the high-part.
245 // Write 'i' if an integer constant, otherwise nothing. Used to print
247 if (MI->getOperand(OpNo).isImm())
253 printOperand(MI, OpNo, O);
257 // At the moment, all inline asm memory operands are a single register.
258 // In any case, the output of this routine should always be just one
259 // assembler operand.
261 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
263 const char *ExtraCode,
265 if (ExtraCode && ExtraCode[0]) {
266 if (ExtraCode[1] != 0) return true; // Unknown modifier.
268 switch (ExtraCode[0]) {
269 default: return true; // Unknown modifier.
270 case 'y': // A memory reference for an X-form instruction
272 const char *RegName = "r0";
273 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
274 O << RegName << ", ";
275 printOperand(MI, OpNo, O);
281 assert(MI->getOperand(OpNo).isReg());
283 printOperand(MI, OpNo, O);
289 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
290 /// exists for it. If not, create one. Then return a symbol that references
292 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
293 const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout();
294 MCSymbol *&TOCEntry = TOC[Sym];
296 // To avoid name clash check if the name already exists.
298 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
299 "C" + Twine(TOCLabelID++)) == nullptr) {
300 TOCEntry = GetTempSymbol("C", TOCLabelID);
308 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
309 /// the current output stream.
311 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
313 bool isPPC64 = Subtarget.isPPC64();
315 // Lower multi-instruction pseudo operations.
316 switch (MI->getOpcode()) {
318 case TargetOpcode::DBG_VALUE:
319 llvm_unreachable("Should be handled target independently");
320 case PPC::MovePCtoLR:
321 case PPC::MovePCtoLR8: {
322 // Transform %LR = MovePCtoLR
323 // Into this, where the label is the PIC base:
326 MCSymbol *PICBase = MF->getPICBaseSymbol();
329 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
330 // FIXME: We would like an efficient form for this, so we don't have to do
331 // a lot of extra uniquing.
332 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
335 OutStreamer.EmitLabel(PICBase);
339 // Get the offset from the GOT Base Register to the GOT
340 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
341 MCSymbol *PICOffset = MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
342 TmpInst.setOpcode(PPC::LWZ);
344 MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
346 MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
347 MCSymbolRefExpr::VK_None,
349 const MCOperand MO = TmpInst.getOperand(1);
350 TmpInst.getOperand(1) = MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp,
353 TmpInst.addOperand(MO);
354 EmitToStreamer(OutStreamer, TmpInst);
357 case PPC::UpdateGBR: {
358 // Update the GOT Base Register to point to the GOT. It may be possible to
359 // merge this with the PPC::GetGBRO, doing it all in one step.
360 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
361 TmpInst.setOpcode(PPC::ADD4);
362 TmpInst.addOperand(TmpInst.getOperand(0));
363 EmitToStreamer(OutStreamer, TmpInst);
367 // Transform %X3 = LWZtoc <ga:@min1>, %X2
368 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
370 // Change the opcode to LWZ, and the global address operand to be a
371 // reference to the GOT entry we will synthesize later.
372 TmpInst.setOpcode(PPC::LWZ);
373 const MachineOperand &MO = MI->getOperand(1);
375 // Map symbol -> label of TOC entry
376 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI());
377 MCSymbol *MOSymbol = nullptr;
379 MOSymbol = getSymbol(MO.getGlobal());
381 MOSymbol = GetCPISymbol(MO.getIndex());
383 MOSymbol = GetJTISymbol(MO.getIndex());
385 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
388 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
391 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".L.TOC.")),
393 Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
394 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
395 EmitToStreamer(OutStreamer, TmpInst);
401 // Transform %X3 = LDtoc <ga:@min1>, %X2
402 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
404 // Change the opcode to LD, and the global address operand to be a
405 // reference to the TOC entry we will synthesize later.
406 TmpInst.setOpcode(PPC::LD);
407 const MachineOperand &MO = MI->getOperand(1);
409 // Map symbol -> label of TOC entry
410 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI());
411 MCSymbol *MOSymbol = nullptr;
413 MOSymbol = getSymbol(MO.getGlobal());
415 MOSymbol = GetCPISymbol(MO.getIndex());
417 MOSymbol = GetJTISymbol(MO.getIndex());
419 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
422 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
424 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
425 EmitToStreamer(OutStreamer, TmpInst);
429 case PPC::ADDIStocHA: {
430 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
431 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
433 // Change the opcode to ADDIS8. If the global address is external, has
434 // common linkage, is a non-local function address, or is a jump table
435 // address, then generate a TOC entry and reference that. Otherwise
436 // reference the symbol directly.
437 TmpInst.setOpcode(PPC::ADDIS8);
438 const MachineOperand &MO = MI->getOperand(2);
439 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI()) &&
440 "Invalid operand for ADDIStocHA!");
441 MCSymbol *MOSymbol = nullptr;
442 bool IsExternal = false;
443 bool IsNonLocalFunction = false;
444 bool IsCommon = false;
445 bool IsAvailExt = false;
448 const GlobalValue *GV = MO.getGlobal();
449 MOSymbol = getSymbol(GV);
450 IsExternal = GV->isDeclaration();
451 IsCommon = GV->hasCommonLinkage();
452 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
453 (GV->isDeclaration() || GV->isWeakForLinker());
454 IsAvailExt = GV->hasAvailableExternallyLinkage();
455 } else if (MO.isCPI())
456 MOSymbol = GetCPISymbol(MO.getIndex());
458 MOSymbol = GetJTISymbol(MO.getIndex());
460 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
461 MO.isJTI() || TM.getCodeModel() == CodeModel::Large)
462 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
465 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
467 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
468 EmitToStreamer(OutStreamer, TmpInst);
472 // Transform %Xd = LDtocL <ga:@sym>, %Xs
473 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
475 // Change the opcode to LD. If the global address is external, has
476 // common linkage, or is a jump table address, then reference the
477 // associated TOC entry. Otherwise reference the symbol directly.
478 TmpInst.setOpcode(PPC::LD);
479 const MachineOperand &MO = MI->getOperand(1);
480 assert((MO.isGlobal() || MO.isJTI() || MO.isCPI()) &&
481 "Invalid operand for LDtocL!");
482 MCSymbol *MOSymbol = nullptr;
485 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
486 else if (MO.isCPI()) {
487 MOSymbol = GetCPISymbol(MO.getIndex());
488 if (TM.getCodeModel() == CodeModel::Large)
489 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
491 else if (MO.isGlobal()) {
492 const GlobalValue *GValue = MO.getGlobal();
493 MOSymbol = getSymbol(GValue);
494 if (GValue->getType()->getElementType()->isFunctionTy() ||
495 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
496 GValue->hasAvailableExternallyLinkage() ||
497 TM.getCodeModel() == CodeModel::Large)
498 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
502 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
504 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
505 EmitToStreamer(OutStreamer, TmpInst);
508 case PPC::ADDItocL: {
509 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
510 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
512 // Change the opcode to ADDI8. If the global address is external, then
513 // generate a TOC entry and reference that. Otherwise reference the
515 TmpInst.setOpcode(PPC::ADDI8);
516 const MachineOperand &MO = MI->getOperand(2);
517 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
518 MCSymbol *MOSymbol = nullptr;
519 bool IsExternal = false;
520 bool IsNonLocalFunction = false;
523 const GlobalValue *GV = MO.getGlobal();
524 MOSymbol = getSymbol(GV);
525 IsExternal = GV->isDeclaration();
526 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
527 (GV->isDeclaration() || GV->isWeakForLinker());
528 } else if (MO.isCPI())
529 MOSymbol = GetCPISymbol(MO.getIndex());
531 if (IsNonLocalFunction || IsExternal ||
532 TM.getCodeModel() == CodeModel::Large)
533 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
536 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
538 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
539 EmitToStreamer(OutStreamer, TmpInst);
542 case PPC::ADDISgotTprelHA: {
543 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
544 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
545 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
546 const MachineOperand &MO = MI->getOperand(2);
547 const GlobalValue *GValue = MO.getGlobal();
548 MCSymbol *MOSymbol = getSymbol(GValue);
549 const MCExpr *SymGotTprel =
550 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
552 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
553 .addReg(MI->getOperand(0).getReg())
555 .addExpr(SymGotTprel));
558 case PPC::LDgotTprelL:
559 case PPC::LDgotTprelL32: {
560 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
561 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
563 // Change the opcode to LD.
564 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
565 const MachineOperand &MO = MI->getOperand(1);
566 const GlobalValue *GValue = MO.getGlobal();
567 MCSymbol *MOSymbol = getSymbol(GValue);
569 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
571 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
572 EmitToStreamer(OutStreamer, TmpInst);
576 case PPC::PPC32PICGOT: {
577 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
578 MCSymbol *GOTRef = OutContext.CreateTempSymbol();
579 MCSymbol *NextInstr = OutContext.CreateTempSymbol();
581 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
582 // FIXME: We would like an efficient form for this, so we don't have to do
583 // a lot of extra uniquing.
584 .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
585 const MCExpr *OffsExpr =
586 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
587 MCSymbolRefExpr::Create(GOTRef, OutContext),
589 OutStreamer.EmitLabel(GOTRef);
590 OutStreamer.EmitValue(OffsExpr, 4);
591 OutStreamer.EmitLabel(NextInstr);
592 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
593 .addReg(MI->getOperand(0).getReg()));
594 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
595 .addReg(MI->getOperand(1).getReg())
597 .addReg(MI->getOperand(0).getReg()));
598 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
599 .addReg(MI->getOperand(0).getReg())
600 .addReg(MI->getOperand(1).getReg())
601 .addReg(MI->getOperand(0).getReg()));
604 case PPC::PPC32GOT: {
605 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
606 const MCExpr *SymGotTlsL =
607 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
609 const MCExpr *SymGotTlsHA =
610 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
612 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
613 .addReg(MI->getOperand(0).getReg())
614 .addExpr(SymGotTlsL));
615 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
616 .addReg(MI->getOperand(0).getReg())
617 .addReg(MI->getOperand(0).getReg())
618 .addExpr(SymGotTlsHA));
621 case PPC::ADDIStlsgdHA: {
622 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
623 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
624 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
625 const MachineOperand &MO = MI->getOperand(2);
626 const GlobalValue *GValue = MO.getGlobal();
627 MCSymbol *MOSymbol = getSymbol(GValue);
628 const MCExpr *SymGotTlsGD =
629 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
631 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
632 .addReg(MI->getOperand(0).getReg())
634 .addExpr(SymGotTlsGD));
637 case PPC::ADDItlsgdL:
638 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
639 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
640 case PPC::ADDItlsgdL32: {
641 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
642 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
643 const MachineOperand &MO = MI->getOperand(2);
644 const GlobalValue *GValue = MO.getGlobal();
645 MCSymbol *MOSymbol = getSymbol(GValue);
646 const MCExpr *SymGotTlsGD =
647 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
648 MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO :
649 MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
651 EmitToStreamer(OutStreamer,
652 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
653 .addReg(MI->getOperand(0).getReg())
654 .addReg(MI->getOperand(1).getReg())
655 .addExpr(SymGotTlsGD));
658 case PPC::GETtlsADDR:
659 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
660 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsgd)
661 case PPC::GETtlsADDR32: {
662 // Transform: %R3 = GETtlsADDR32 %R3, <ga:@sym>
663 // Into: BL_TLS __tls_get_addr(sym@tlsgd)@PLT
665 StringRef Name = "__tls_get_addr";
666 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
667 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
669 if (!Subtarget.isPPC64() && !Subtarget.isDarwin() &&
670 TM.getRelocationModel() == Reloc::PIC_)
671 Kind = MCSymbolRefExpr::VK_PLT;
672 const MCSymbolRefExpr *TlsRef =
673 MCSymbolRefExpr::Create(TlsGetAddr, Kind, OutContext);
674 const MachineOperand &MO = MI->getOperand(2);
675 const GlobalValue *GValue = MO.getGlobal();
676 MCSymbol *MOSymbol = getSymbol(GValue);
677 const MCExpr *SymVar =
678 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSGD,
680 EmitToStreamer(OutStreamer,
681 MCInstBuilder(Subtarget.isPPC64() ?
682 PPC::BL8_NOP_TLS : PPC::BL_TLS)
687 case PPC::ADDIStlsldHA: {
688 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
689 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
690 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
691 const MachineOperand &MO = MI->getOperand(2);
692 const GlobalValue *GValue = MO.getGlobal();
693 MCSymbol *MOSymbol = getSymbol(GValue);
694 const MCExpr *SymGotTlsLD =
695 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
697 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
698 .addReg(MI->getOperand(0).getReg())
700 .addExpr(SymGotTlsLD));
703 case PPC::ADDItlsldL:
704 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
705 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
706 case PPC::ADDItlsldL32: {
707 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
708 // Into: %Rd = ADDI %Rs, sym@got@tlsld
709 const MachineOperand &MO = MI->getOperand(2);
710 const GlobalValue *GValue = MO.getGlobal();
711 MCSymbol *MOSymbol = getSymbol(GValue);
712 const MCExpr *SymGotTlsLD =
713 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
714 MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO :
715 MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
717 EmitToStreamer(OutStreamer,
718 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
719 .addReg(MI->getOperand(0).getReg())
720 .addReg(MI->getOperand(1).getReg())
721 .addExpr(SymGotTlsLD));
724 case PPC::GETtlsldADDR:
725 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
726 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsld)
727 case PPC::GETtlsldADDR32: {
728 // Transform: %R3 = GETtlsldADDR32 %R3, <ga:@sym>
729 // Into: BL_TLS __tls_get_addr(sym@tlsld)@PLT
731 StringRef Name = "__tls_get_addr";
732 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
733 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
735 if (!Subtarget.isPPC64() && !Subtarget.isDarwin() &&
736 TM.getRelocationModel() == Reloc::PIC_)
737 Kind = MCSymbolRefExpr::VK_PLT;
739 const MCSymbolRefExpr *TlsRef =
740 MCSymbolRefExpr::Create(TlsGetAddr, Kind, OutContext);
741 const MachineOperand &MO = MI->getOperand(2);
742 const GlobalValue *GValue = MO.getGlobal();
743 MCSymbol *MOSymbol = getSymbol(GValue);
744 const MCExpr *SymVar =
745 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSLD,
747 EmitToStreamer(OutStreamer,
748 MCInstBuilder(Subtarget.isPPC64() ?
749 PPC::BL8_NOP_TLS : PPC::BL_TLS)
754 case PPC::ADDISdtprelHA:
755 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
756 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
757 case PPC::ADDISdtprelHA32: {
758 // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
759 // Into: %Rd = ADDIS %R3, sym@dtprel@ha
760 const MachineOperand &MO = MI->getOperand(2);
761 const GlobalValue *GValue = MO.getGlobal();
762 MCSymbol *MOSymbol = getSymbol(GValue);
763 const MCExpr *SymDtprel =
764 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
766 EmitToStreamer(OutStreamer,
767 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
768 .addReg(MI->getOperand(0).getReg())
769 .addReg(Subtarget.isPPC64() ? PPC::X3 : PPC::R3)
770 .addExpr(SymDtprel));
773 case PPC::ADDIdtprelL:
774 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
775 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
776 case PPC::ADDIdtprelL32: {
777 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
778 // Into: %Rd = ADDI %Rs, sym@dtprel@l
779 const MachineOperand &MO = MI->getOperand(2);
780 const GlobalValue *GValue = MO.getGlobal();
781 MCSymbol *MOSymbol = getSymbol(GValue);
782 const MCExpr *SymDtprel =
783 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
785 EmitToStreamer(OutStreamer,
786 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
787 .addReg(MI->getOperand(0).getReg())
788 .addReg(MI->getOperand(1).getReg())
789 .addExpr(SymDtprel));
794 if (!Subtarget.hasMFOCRF()) {
795 // Transform: %R3 = MFOCRF %CR7
796 // Into: %R3 = MFCR ;; cr7
798 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
799 OutStreamer.AddComment(PPCInstPrinter::
800 getRegisterName(MI->getOperand(1).getReg()));
801 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
802 .addReg(MI->getOperand(0).getReg()));
808 if (!Subtarget.hasMFOCRF()) {
809 // Transform: %CR7 = MTOCRF %R3
810 // Into: MTCRF mask, %R3 ;; cr7
812 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
813 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
814 ->getEncodingValue(MI->getOperand(0).getReg());
815 OutStreamer.AddComment(PPCInstPrinter::
816 getRegisterName(MI->getOperand(0).getReg()));
817 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
819 .addReg(MI->getOperand(1).getReg()));
827 // Verify alignment is legal, so we don't create relocations
828 // that can't be supported.
829 // FIXME: This test is currently disabled for Darwin. The test
830 // suite shows a handful of test cases that fail this check for
831 // Darwin. Those need to be investigated before this sanity test
832 // can be enabled for those subtargets.
833 if (!Subtarget.isDarwin()) {
834 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
835 const MachineOperand &MO = MI->getOperand(OpNum);
836 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
837 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
839 // Now process the instruction normally.
844 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
845 EmitToStreamer(OutStreamer, TmpInst);
848 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
849 if (Subtarget.isELFv2ABI()) {
850 PPCTargetStreamer *TS =
851 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
854 TS->emitAbiVersion(2);
857 if (Subtarget.isPPC64() || TM.getRelocationModel() != Reloc::PIC_)
858 return AsmPrinter::EmitStartOfAsmFile(M);
860 // FIXME: The use of .got2 assumes large GOT model (-fPIC), which is not
861 // optimal for some cases. We should consider supporting small model (-fpic)
862 // as well in the future.
863 assert(TM.getCodeModel() != CodeModel::Small &&
864 "Small code model PIC is currently unsupported.");
865 OutStreamer.SwitchSection(OutContext.getELFSection(".got2",
866 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
867 SectionKind::getReadOnly()));
869 MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".L.TOC."));
870 MCSymbol *CurrentPos = OutContext.CreateTempSymbol();
872 OutStreamer.EmitLabel(CurrentPos);
874 // The GOT pointer points to the middle of the GOT, in order to reference the
875 // entire 64kB range. 0x8000 is the midpoint.
876 const MCExpr *tocExpr =
877 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
878 MCConstantExpr::Create(0x8000, OutContext),
881 OutStreamer.EmitAssignment(TOCSym, tocExpr);
883 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
886 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
887 // linux/ppc32 - Normal entry label.
888 if (!Subtarget.isPPC64() && TM.getRelocationModel() != Reloc::PIC_)
889 return AsmPrinter::EmitFunctionEntryLabel();
891 if (!Subtarget.isPPC64()) {
892 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
893 if (PPCFI->usesPICBase()) {
894 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
895 MCSymbol *PICBase = MF->getPICBaseSymbol();
896 OutStreamer.EmitLabel(RelocSymbol);
898 const MCExpr *OffsExpr =
899 MCBinaryExpr::CreateSub(
900 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".L.TOC.")),
902 MCSymbolRefExpr::Create(PICBase, OutContext),
904 OutStreamer.EmitValue(OffsExpr, 4);
905 OutStreamer.EmitLabel(CurrentFnSym);
908 return AsmPrinter::EmitFunctionEntryLabel();
911 // ELFv2 ABI - Normal entry label.
912 if (Subtarget.isELFv2ABI())
913 return AsmPrinter::EmitFunctionEntryLabel();
915 // Emit an official procedure descriptor.
916 MCSectionSubPair Current = OutStreamer.getCurrentSection();
917 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
918 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
919 SectionKind::getReadOnly());
920 OutStreamer.SwitchSection(Section);
921 OutStreamer.EmitLabel(CurrentFnSym);
922 OutStreamer.EmitValueToAlignment(8);
924 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
925 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
927 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
929 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
930 // Generates a R_PPC64_TOC relocation for TOC base insertion.
931 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
932 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
934 // Emit a null environment pointer.
935 OutStreamer.EmitIntValue(0, 8 /* size */);
936 OutStreamer.SwitchSection(Current.first, Current.second);
938 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
939 ".L." + Twine(CurrentFnSym->getName()));
940 OutStreamer.EmitLabel(RealFnSym);
941 CurrentFnSymForSize = RealFnSym;
945 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
946 const DataLayout *TD = TM.getSubtargetImpl()->getDataLayout();
948 bool isPPC64 = TD->getPointerSizeInBits() == 64;
950 PPCTargetStreamer &TS =
951 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
954 const MCSectionELF *Section;
957 Section = OutStreamer.getContext().getELFSection(".toc",
958 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
959 SectionKind::getReadOnly());
961 Section = OutStreamer.getContext().getELFSection(".got2",
962 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
963 SectionKind::getReadOnly());
964 OutStreamer.SwitchSection(Section);
966 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
967 E = TOC.end(); I != E; ++I) {
968 OutStreamer.EmitLabel(I->second);
969 MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
973 OutStreamer.EmitSymbolValue(S, 4);
977 MachineModuleInfoELF &MMIELF =
978 MMI->getObjFileInfo<MachineModuleInfoELF>();
980 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
981 if (!Stubs.empty()) {
982 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
983 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
985 OutStreamer.EmitLabel(Stubs[i].first);
987 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
989 isPPC64 ? 8 : 4/*size*/);
993 OutStreamer.AddBlankLine();
996 return AsmPrinter::doFinalization(M);
999 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1000 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1001 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1002 // provide two entry points. The ABI guarantees that when calling the
1003 // local entry point, r2 is set up by the caller to contain the TOC base
1004 // for this function, and when calling the global entry point, r12 is set
1005 // up by the caller to hold the address of the global entry point. We
1006 // thus emit a prefix sequence along the following lines:
1009 // # global entry point
1010 // addis r2,r12,(.TOC.-func)@ha
1011 // addi r2,r2,(.TOC.-func)@l
1012 // .localentry func, .-func
1013 // # local entry point, followed by function body
1015 // This ensures we have r2 set up correctly while executing the function
1016 // body, no matter which entry point is called.
1017 if (Subtarget.isELFv2ABI()
1018 // Only do all that if the function uses r2 in the first place.
1019 && !MF->getRegInfo().use_empty(PPC::X2)) {
1021 MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol();
1022 OutStreamer.EmitLabel(GlobalEntryLabel);
1023 const MCSymbolRefExpr *GlobalEntryLabelExp =
1024 MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext);
1026 MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1027 const MCExpr *TOCDeltaExpr =
1028 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext),
1029 GlobalEntryLabelExp, OutContext);
1031 const MCExpr *TOCDeltaHi =
1032 PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext);
1033 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1036 .addExpr(TOCDeltaHi));
1038 const MCExpr *TOCDeltaLo =
1039 PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext);
1040 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI)
1043 .addExpr(TOCDeltaLo));
1045 MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol();
1046 OutStreamer.EmitLabel(LocalEntryLabel);
1047 const MCSymbolRefExpr *LocalEntryLabelExp =
1048 MCSymbolRefExpr::Create(LocalEntryLabel, OutContext);
1049 const MCExpr *LocalOffsetExp =
1050 MCBinaryExpr::CreateSub(LocalEntryLabelExp,
1051 GlobalEntryLabelExp, OutContext);
1053 PPCTargetStreamer *TS =
1054 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1057 TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp);
1061 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1064 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1065 // Only the 64-bit target requires a traceback table. For now,
1066 // we only emit the word of zeroes that GDB requires to find
1067 // the end of the function, and zeroes for the eight-byte
1068 // mandatory fields.
1069 // FIXME: We should fill in the eight-byte mandatory fields as described in
1070 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1071 // currently make use of these fields).
1072 if (Subtarget.isPPC64()) {
1073 OutStreamer.EmitIntValue(0, 4/*size*/);
1074 OutStreamer.EmitIntValue(0, 8/*size*/);
1078 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1079 static const char *const CPUDirectives[] = {
1103 unsigned Directive = Subtarget.getDarwinDirective();
1104 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
1105 Directive = PPC::DIR_970;
1106 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
1107 Directive = PPC::DIR_7400;
1108 if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
1109 Directive = PPC::DIR_64;
1110 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1112 assert(Directive < array_lengthof(CPUDirectives) &&
1113 "CPUDirectives[] might not be up-to-date!");
1114 PPCTargetStreamer &TStreamer =
1115 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1116 TStreamer.emitMachine(CPUDirectives[Directive]);
1118 // Prime text sections so they are adjacent. This reduces the likelihood a
1119 // large data or debug section causes a branch to exceed 16M limit.
1120 const TargetLoweringObjectFileMachO &TLOFMacho =
1121 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1122 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
1123 if (TM.getRelocationModel() == Reloc::PIC_) {
1124 OutStreamer.SwitchSection(
1125 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1126 MachO::S_SYMBOL_STUBS |
1127 MachO::S_ATTR_PURE_INSTRUCTIONS,
1128 32, SectionKind::getText()));
1129 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1130 OutStreamer.SwitchSection(
1131 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1132 MachO::S_SYMBOL_STUBS |
1133 MachO::S_ATTR_PURE_INSTRUCTIONS,
1134 16, SectionKind::getText()));
1136 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1139 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1140 // Remove $stub suffix, add $lazy_ptr.
1141 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1142 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
1145 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1146 // Add $tmp suffix to $stub, yielding $stub$tmp.
1147 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
1150 void PPCDarwinAsmPrinter::
1151 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1153 TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64;
1154 bool isDarwin = Subtarget.isDarwin();
1156 const TargetLoweringObjectFileMachO &TLOFMacho =
1157 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1159 // .lazy_symbol_pointer
1160 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1162 // Output stubs for dynamically-linked functions
1163 if (TM.getRelocationModel() == Reloc::PIC_) {
1164 const MCSection *StubSection =
1165 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1166 MachO::S_SYMBOL_STUBS |
1167 MachO::S_ATTR_PURE_INSTRUCTIONS,
1168 32, SectionKind::getText());
1169 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1170 OutStreamer.SwitchSection(StubSection);
1173 MCSymbol *Stub = Stubs[i].first;
1174 MCSymbol *RawSym = Stubs[i].second.getPointer();
1175 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1176 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1178 OutStreamer.EmitLabel(Stub);
1179 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1181 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
1182 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1184 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
1187 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1188 // bcl 20, 31, AnonSymbol
1189 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1190 OutStreamer.EmitLabel(AnonSymbol);
1192 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1193 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1194 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
1195 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1200 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1202 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1203 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1204 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
1205 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1207 .addExpr(SubLo16).addExpr(SubLo16)
1210 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1212 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1214 OutStreamer.SwitchSection(LSPSection);
1215 OutStreamer.EmitLabel(LazyPtr);
1216 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1218 MCSymbol *DyldStubBindingHelper =
1219 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1221 // .quad dyld_stub_binding_helper
1222 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1224 // .long dyld_stub_binding_helper
1225 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1228 OutStreamer.AddBlankLine();
1232 const MCSection *StubSection =
1233 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1234 MachO::S_SYMBOL_STUBS |
1235 MachO::S_ATTR_PURE_INSTRUCTIONS,
1236 16, SectionKind::getText());
1237 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1238 MCSymbol *Stub = Stubs[i].first;
1239 MCSymbol *RawSym = Stubs[i].second.getPointer();
1240 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1241 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1243 OutStreamer.SwitchSection(StubSection);
1245 OutStreamer.EmitLabel(Stub);
1246 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1248 // lis r11, ha16(LazyPtr)
1249 const MCExpr *LazyPtrHa16 =
1250 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
1251 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
1253 .addExpr(LazyPtrHa16));
1255 // ldu r12, lo16(LazyPtr)(r11)
1256 // lwzu r12, lo16(LazyPtr)(r11)
1257 const MCExpr *LazyPtrLo16 =
1258 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1259 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1261 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1265 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1267 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1269 OutStreamer.SwitchSection(LSPSection);
1270 OutStreamer.EmitLabel(LazyPtr);
1271 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1273 MCSymbol *DyldStubBindingHelper =
1274 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1276 // .quad dyld_stub_binding_helper
1277 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1279 // .long dyld_stub_binding_helper
1280 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1284 OutStreamer.AddBlankLine();
1288 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1290 TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64;
1292 // Darwin/PPC always uses mach-o.
1293 const TargetLoweringObjectFileMachO &TLOFMacho =
1294 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1295 MachineModuleInfoMachO &MMIMacho =
1296 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1298 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1300 EmitFunctionStubs(Stubs);
1302 if (MAI->doesSupportExceptionHandling() && MMI) {
1303 // Add the (possibly multiple) personalities to the set of global values.
1304 // Only referenced functions get into the Personalities list.
1305 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1306 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1307 E = Personalities.end(); I != E; ++I) {
1309 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1310 MachineModuleInfoImpl::StubValueTy &StubSym =
1311 MMIMacho.getGVStubEntry(NLPSym);
1312 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1317 // Output stubs for dynamically-linked functions.
1318 Stubs = MMIMacho.GetGVStubList();
1320 // Output macho stubs for external and common global variables.
1321 if (!Stubs.empty()) {
1322 // Switch with ".non_lazy_symbol_pointer" directive.
1323 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1324 EmitAlignment(isPPC64 ? 3 : 2);
1326 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1328 OutStreamer.EmitLabel(Stubs[i].first);
1329 // .indirect_symbol _foo
1330 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1331 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1334 // External to current translation unit.
1335 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1337 // Internal to current translation unit.
1339 // When we place the LSDA into the TEXT section, the type info pointers
1340 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1341 // However, sometimes the types are local to the file. So we need to
1342 // fill in the value for the NLP in those cases.
1343 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1345 isPPC64 ? 8 : 4/*size*/);
1349 OutStreamer.AddBlankLine();
1352 Stubs = MMIMacho.GetHiddenGVStubList();
1353 if (!Stubs.empty()) {
1354 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1355 EmitAlignment(isPPC64 ? 3 : 2);
1357 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1359 OutStreamer.EmitLabel(Stubs[i].first);
1361 OutStreamer.EmitValue(MCSymbolRefExpr::
1362 Create(Stubs[i].second.getPointer(),
1364 isPPC64 ? 8 : 4/*size*/);
1368 OutStreamer.AddBlankLine();
1371 // Funny Darwin hack: This flag tells the linker that no global symbols
1372 // contain code that falls through to other global symbols (e.g. the obvious
1373 // implementation of multiple entry points). If this doesn't occur, the
1374 // linker can safely perform dead code stripping. Since LLVM never generates
1375 // code that does this, it is always safe to set.
1376 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1378 return AsmPrinter::doFinalization(M);
1381 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1382 /// for a MachineFunction to the given output stream, in a format that the
1383 /// Darwin assembler can deal with.
1385 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1386 MCStreamer &Streamer) {
1387 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1389 if (Subtarget->isDarwin())
1390 return new PPCDarwinAsmPrinter(tm, Streamer);
1391 return new PPCLinuxAsmPrinter(tm, Streamer);
1394 // Force static initialization.
1395 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1396 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1397 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1398 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);