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 "MCTargetDesc/PPCMCExpr.h"
22 #include "MCTargetDesc/PPCPredicates.h"
23 #include "PPCMachineFunctionInfo.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/StackMaps.h"
38 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
39 #include "llvm/IR/Constants.h"
40 #include "llvm/IR/DebugInfo.h"
41 #include "llvm/IR/DerivedTypes.h"
42 #include "llvm/IR/Mangler.h"
43 #include "llvm/IR/Module.h"
44 #include "llvm/MC/MCAsmInfo.h"
45 #include "llvm/MC/MCContext.h"
46 #include "llvm/MC/MCExpr.h"
47 #include "llvm/MC/MCInst.h"
48 #include "llvm/MC/MCInstBuilder.h"
49 #include "llvm/MC/MCSectionELF.h"
50 #include "llvm/MC/MCSectionMachO.h"
51 #include "llvm/MC/MCStreamer.h"
52 #include "llvm/MC/MCSymbol.h"
53 #include "llvm/Support/CommandLine.h"
54 #include "llvm/Support/Debug.h"
55 #include "llvm/Support/ELF.h"
56 #include "llvm/Support/ErrorHandling.h"
57 #include "llvm/Support/MathExtras.h"
58 #include "llvm/Support/TargetRegistry.h"
59 #include "llvm/Support/raw_ostream.h"
60 #include "llvm/Target/TargetInstrInfo.h"
61 #include "llvm/Target/TargetOptions.h"
62 #include "llvm/Target/TargetRegisterInfo.h"
65 #define DEBUG_TYPE "asmprinter"
68 class PPCAsmPrinter : public AsmPrinter {
70 MapVector<MCSymbol*, MCSymbol*> TOC;
71 const PPCSubtarget *Subtarget;
75 explicit PPCAsmPrinter(TargetMachine &TM,
76 std::unique_ptr<MCStreamer> Streamer)
77 : AsmPrinter(TM, std::move(Streamer)), TOCLabelID(0), SM(*this) {}
79 const char *getPassName() const override {
80 return "PowerPC Assembly Printer";
83 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
85 void EmitInstruction(const MachineInstr *MI) override;
87 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
89 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
90 unsigned AsmVariant, const char *ExtraCode,
91 raw_ostream &O) override;
92 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
93 unsigned AsmVariant, const char *ExtraCode,
94 raw_ostream &O) override;
96 void EmitEndOfAsmFile(Module &M) override;
98 void LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
99 const MachineInstr &MI);
100 void LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
101 const MachineInstr &MI);
102 void EmitTlsCall(const MachineInstr *MI, MCSymbolRefExpr::VariantKind VK);
103 bool runOnMachineFunction(MachineFunction &MF) override {
104 Subtarget = &MF.getSubtarget<PPCSubtarget>();
105 return AsmPrinter::runOnMachineFunction(MF);
109 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
110 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
112 explicit PPCLinuxAsmPrinter(TargetMachine &TM,
113 std::unique_ptr<MCStreamer> Streamer)
114 : PPCAsmPrinter(TM, std::move(Streamer)) {}
116 const char *getPassName() const override {
117 return "Linux PPC Assembly Printer";
120 bool doFinalization(Module &M) override;
121 void EmitStartOfAsmFile(Module &M) override;
123 void EmitFunctionEntryLabel() override;
125 void EmitFunctionBodyStart() override;
126 void EmitFunctionBodyEnd() override;
129 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
131 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
133 explicit PPCDarwinAsmPrinter(TargetMachine &TM,
134 std::unique_ptr<MCStreamer> Streamer)
135 : PPCAsmPrinter(TM, std::move(Streamer)) {}
137 const char *getPassName() const override {
138 return "Darwin PPC Assembly Printer";
141 bool doFinalization(Module &M) override;
142 void EmitStartOfAsmFile(Module &M) override;
144 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
146 } // end of anonymous namespace
148 /// stripRegisterPrefix - This method strips the character prefix from a
149 /// register name so that only the number is left. Used by for linux asm.
150 static const char *stripRegisterPrefix(const char *RegName) {
151 switch (RegName[0]) {
156 if (RegName[1] == 's')
159 case 'c': if (RegName[1] == 'r') return RegName + 2;
165 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
167 const DataLayout *DL = TM.getDataLayout();
168 const MachineOperand &MO = MI->getOperand(OpNo);
170 switch (MO.getType()) {
171 case MachineOperand::MO_Register: {
172 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
173 // Linux assembler (Others?) does not take register mnemonics.
174 // FIXME - What about special registers used in mfspr/mtspr?
175 if (!Subtarget->isDarwin())
176 RegName = stripRegisterPrefix(RegName);
180 case MachineOperand::MO_Immediate:
184 case MachineOperand::MO_MachineBasicBlock:
185 O << *MO.getMBB()->getSymbol();
187 case MachineOperand::MO_ConstantPoolIndex:
188 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
189 << '_' << MO.getIndex();
191 case MachineOperand::MO_BlockAddress:
192 O << *GetBlockAddressSymbol(MO.getBlockAddress());
194 case MachineOperand::MO_GlobalAddress: {
195 // Computing the address of a global symbol, not calling it.
196 const GlobalValue *GV = MO.getGlobal();
197 MCSymbol *SymToPrint;
199 // External or weakly linked global variables need non-lazily-resolved stubs
200 if (TM.getRelocationModel() != Reloc::Static &&
201 (GV->isDeclaration() || GV->isWeakForLinker())) {
202 if (!GV->hasHiddenVisibility()) {
203 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
204 MachineModuleInfoImpl::StubValueTy &StubSym =
205 MMI->getObjFileInfo<MachineModuleInfoMachO>()
206 .getGVStubEntry(SymToPrint);
207 if (!StubSym.getPointer())
208 StubSym = MachineModuleInfoImpl::
209 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
210 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
211 GV->hasAvailableExternallyLinkage()) {
212 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
214 MachineModuleInfoImpl::StubValueTy &StubSym =
215 MMI->getObjFileInfo<MachineModuleInfoMachO>().
216 getHiddenGVStubEntry(SymToPrint);
217 if (!StubSym.getPointer())
218 StubSym = MachineModuleInfoImpl::
219 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
221 SymToPrint = getSymbol(GV);
224 SymToPrint = getSymbol(GV);
229 printOffset(MO.getOffset(), O);
234 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
239 /// PrintAsmOperand - Print out an operand for an inline asm expression.
241 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
243 const char *ExtraCode, raw_ostream &O) {
244 // Does this asm operand have a single letter operand modifier?
245 if (ExtraCode && ExtraCode[0]) {
246 if (ExtraCode[1] != 0) return true; // Unknown modifier.
248 switch (ExtraCode[0]) {
250 // See if this is a generic print operand
251 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
252 case 'c': // Don't print "$" before a global var name or constant.
253 break; // PPC never has a prefix.
254 case 'L': // Write second word of DImode reference.
255 // Verify that this operand has two consecutive registers.
256 if (!MI->getOperand(OpNo).isReg() ||
257 OpNo+1 == MI->getNumOperands() ||
258 !MI->getOperand(OpNo+1).isReg())
260 ++OpNo; // Return the high-part.
263 // Write 'i' if an integer constant, otherwise nothing. Used to print
265 if (MI->getOperand(OpNo).isImm())
271 printOperand(MI, OpNo, O);
275 // At the moment, all inline asm memory operands are a single register.
276 // In any case, the output of this routine should always be just one
277 // assembler operand.
279 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
281 const char *ExtraCode,
283 if (ExtraCode && ExtraCode[0]) {
284 if (ExtraCode[1] != 0) return true; // Unknown modifier.
286 switch (ExtraCode[0]) {
287 default: return true; // Unknown modifier.
288 case 'y': // A memory reference for an X-form instruction
290 const char *RegName = "r0";
291 if (!Subtarget->isDarwin())
292 RegName = stripRegisterPrefix(RegName);
293 O << RegName << ", ";
294 printOperand(MI, OpNo, O);
297 case 'U': // Print 'u' for update form.
298 case 'X': // Print 'x' for indexed form.
300 // FIXME: Currently for PowerPC memory operands are always loaded
301 // into a register, so we never get an update or indexed form.
302 // This is bad even for offset forms, since even if we know we
303 // have a value in -16(r1), we will generate a load into r<n>
304 // and then load from 0(r<n>). Until that issue is fixed,
305 // tolerate 'U' and 'X' but don't output anything.
306 assert(MI->getOperand(OpNo).isReg());
312 assert(MI->getOperand(OpNo).isReg());
314 printOperand(MI, OpNo, O);
320 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
321 /// exists for it. If not, create one. Then return a symbol that references
323 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
324 const DataLayout *DL = TM.getDataLayout();
325 MCSymbol *&TOCEntry = TOC[Sym];
327 // To avoid name clash check if the name already exists.
329 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
330 "C" + Twine(TOCLabelID++)) == nullptr) {
331 TOCEntry = GetTempSymbol("C", TOCLabelID);
338 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
339 SM.serializeToStackMapSection();
342 void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
343 const MachineInstr &MI) {
344 unsigned NumNOPBytes = MI.getOperand(1).getImm();
346 SM.recordStackMap(MI);
347 assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
349 // Scan ahead to trim the shadow.
350 const MachineBasicBlock &MBB = *MI.getParent();
351 MachineBasicBlock::const_iterator MII(MI);
353 while (NumNOPBytes > 0) {
354 if (MII == MBB.end() || MII->isCall() ||
355 MII->getOpcode() == PPC::DBG_VALUE ||
356 MII->getOpcode() == TargetOpcode::PATCHPOINT ||
357 MII->getOpcode() == TargetOpcode::STACKMAP)
364 for (unsigned i = 0; i < NumNOPBytes; i += 4)
365 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
368 // Lower a patchpoint of the form:
369 // [<def>], <id>, <numBytes>, <target>, <numArgs>
370 void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
371 const MachineInstr &MI) {
372 SM.recordPatchPoint(MI);
373 PatchPointOpers Opers(&MI);
375 int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
376 unsigned EncodedBytes = 0;
378 assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
379 "High 16 bits of call target should be zero.");
380 unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
382 // Materialize the jump address:
383 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8)
385 .addImm((CallTarget >> 32) & 0xFFFF));
386 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC)
389 .addImm(32).addImm(16));
390 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8)
393 .addImm((CallTarget >> 16) & 0xFFFF));
394 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8)
397 .addImm(CallTarget & 0xFFFF));
399 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg));
400 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8));
404 unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
405 assert(NumBytes >= EncodedBytes &&
406 "Patchpoint can't request size less than the length of a call.");
407 assert((NumBytes - EncodedBytes) % 4 == 0 &&
408 "Invalid number of NOP bytes requested!");
409 for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
410 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
413 /// EmitTlsCall -- Given a GETtls[ld]ADDR[32] instruction, print a
414 /// call to __tls_get_addr to the current output stream.
415 void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
416 MCSymbolRefExpr::VariantKind VK) {
417 StringRef Name = "__tls_get_addr";
418 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
419 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
421 assert(MI->getOperand(0).isReg() &&
422 ((Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::X3) ||
423 (!Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::R3)) &&
424 "GETtls[ld]ADDR[32] must define GPR3");
425 assert(MI->getOperand(1).isReg() &&
426 ((Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::X3) ||
427 (!Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::R3)) &&
428 "GETtls[ld]ADDR[32] must read GPR3");
430 if (!Subtarget->isPPC64() && !Subtarget->isDarwin() &&
431 TM.getRelocationModel() == Reloc::PIC_)
432 Kind = MCSymbolRefExpr::VK_PLT;
433 const MCSymbolRefExpr *TlsRef =
434 MCSymbolRefExpr::Create(TlsGetAddr, Kind, OutContext);
435 const MachineOperand &MO = MI->getOperand(2);
436 const GlobalValue *GValue = MO.getGlobal();
437 MCSymbol *MOSymbol = getSymbol(GValue);
438 const MCExpr *SymVar = MCSymbolRefExpr::Create(MOSymbol, VK, OutContext);
439 EmitToStreamer(OutStreamer,
440 MCInstBuilder(Subtarget->isPPC64() ?
441 PPC::BL8_NOP_TLS : PPC::BL_TLS)
446 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
447 /// the current output stream.
449 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
451 bool isPPC64 = Subtarget->isPPC64();
452 bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
453 const Module *M = MF->getFunction()->getParent();
454 PICLevel::Level PL = M->getPICLevel();
456 // Lower multi-instruction pseudo operations.
457 switch (MI->getOpcode()) {
459 case TargetOpcode::DBG_VALUE:
460 llvm_unreachable("Should be handled target independently");
461 case TargetOpcode::STACKMAP:
462 return LowerSTACKMAP(OutStreamer, SM, *MI);
463 case TargetOpcode::PATCHPOINT:
464 return LowerPATCHPOINT(OutStreamer, SM, *MI);
466 case PPC::MoveGOTtoLR: {
467 // Transform %LR = MoveGOTtoLR
468 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
469 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
470 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
472 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
473 MCSymbol *GOTSymbol =
474 OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
475 const MCExpr *OffsExpr =
476 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol,
477 MCSymbolRefExpr::VK_PPC_LOCAL,
479 MCConstantExpr::Create(4, OutContext),
483 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
486 case PPC::MovePCtoLR:
487 case PPC::MovePCtoLR8: {
488 // Transform %LR = MovePCtoLR
489 // Into this, where the label is the PIC base:
492 MCSymbol *PICBase = MF->getPICBaseSymbol();
495 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
496 // FIXME: We would like an efficient form for this, so we don't have to do
497 // a lot of extra uniquing.
498 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
501 OutStreamer.EmitLabel(PICBase);
504 case PPC::UpdateGBR: {
505 // Transform %Rd = UpdateGBR(%Rt, %Ri)
506 // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
508 // Get the offset from the GOT Base Register to the GOT
509 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
510 MCSymbol *PICOffset =
511 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
512 TmpInst.setOpcode(PPC::LWZ);
514 MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
516 MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
517 MCSymbolRefExpr::VK_None,
519 const MCOperand TR = TmpInst.getOperand(1);
520 const MCOperand PICR = TmpInst.getOperand(0);
522 // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
523 TmpInst.getOperand(1) =
524 MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp, PB, OutContext));
525 TmpInst.getOperand(0) = TR;
526 TmpInst.getOperand(2) = PICR;
527 EmitToStreamer(OutStreamer, TmpInst);
529 TmpInst.setOpcode(PPC::ADD4);
530 TmpInst.getOperand(0) = PICR;
531 TmpInst.getOperand(1) = TR;
532 TmpInst.getOperand(2) = PICR;
533 EmitToStreamer(OutStreamer, TmpInst);
537 // Transform %R3 = LWZtoc <ga:@min1>, %R2
538 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
540 // Change the opcode to LWZ, and the global address operand to be a
541 // reference to the GOT entry we will synthesize later.
542 TmpInst.setOpcode(PPC::LWZ);
543 const MachineOperand &MO = MI->getOperand(1);
545 // Map symbol -> label of TOC entry
546 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
547 MCSymbol *MOSymbol = nullptr;
549 MOSymbol = getSymbol(MO.getGlobal());
551 MOSymbol = GetCPISymbol(MO.getIndex());
553 MOSymbol = GetJTISymbol(MO.getIndex());
554 else if (MO.isBlockAddress())
555 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
557 if (PL == PICLevel::Small) {
559 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_GOT,
561 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
563 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
566 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
569 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
571 Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
572 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
574 EmitToStreamer(OutStreamer, TmpInst);
581 // Transform %X3 = LDtoc <ga:@min1>, %X2
582 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
584 // Change the opcode to LD, and the global address operand to be a
585 // reference to the TOC entry we will synthesize later.
586 TmpInst.setOpcode(PPC::LD);
587 const MachineOperand &MO = MI->getOperand(1);
589 // Map symbol -> label of TOC entry
590 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
591 MCSymbol *MOSymbol = nullptr;
593 MOSymbol = getSymbol(MO.getGlobal());
595 MOSymbol = GetCPISymbol(MO.getIndex());
597 MOSymbol = GetJTISymbol(MO.getIndex());
598 else if (MO.isBlockAddress())
599 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
601 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
604 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
606 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
607 EmitToStreamer(OutStreamer, TmpInst);
611 case PPC::ADDIStocHA: {
612 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
613 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
615 // Change the opcode to ADDIS8. If the global address is external, has
616 // common linkage, is a non-local function address, or is a jump table
617 // address, then generate a TOC entry and reference that. Otherwise
618 // reference the symbol directly.
619 TmpInst.setOpcode(PPC::ADDIS8);
620 const MachineOperand &MO = MI->getOperand(2);
621 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
622 MO.isBlockAddress()) &&
623 "Invalid operand for ADDIStocHA!");
624 MCSymbol *MOSymbol = nullptr;
625 bool IsExternal = false;
626 bool IsNonLocalFunction = false;
627 bool IsCommon = false;
628 bool IsAvailExt = false;
631 const GlobalValue *GV = MO.getGlobal();
632 MOSymbol = getSymbol(GV);
633 IsExternal = GV->isDeclaration();
634 IsCommon = GV->hasCommonLinkage();
635 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
636 (GV->isDeclaration() || GV->isWeakForLinker());
637 IsAvailExt = GV->hasAvailableExternallyLinkage();
638 } else if (MO.isCPI())
639 MOSymbol = GetCPISymbol(MO.getIndex());
641 MOSymbol = GetJTISymbol(MO.getIndex());
642 else if (MO.isBlockAddress())
643 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
645 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
646 MO.isJTI() || MO.isBlockAddress() ||
647 TM.getCodeModel() == CodeModel::Large)
648 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
651 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
653 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
654 EmitToStreamer(OutStreamer, TmpInst);
658 // Transform %Xd = LDtocL <ga:@sym>, %Xs
659 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
661 // Change the opcode to LD. If the global address is external, has
662 // common linkage, or is a jump table address, then reference the
663 // associated TOC entry. Otherwise reference the symbol directly.
664 TmpInst.setOpcode(PPC::LD);
665 const MachineOperand &MO = MI->getOperand(1);
666 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
667 MO.isBlockAddress()) &&
668 "Invalid operand for LDtocL!");
669 MCSymbol *MOSymbol = nullptr;
672 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
673 else if (MO.isBlockAddress()) {
674 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
675 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
677 else if (MO.isCPI()) {
678 MOSymbol = GetCPISymbol(MO.getIndex());
679 if (TM.getCodeModel() == CodeModel::Large)
680 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
682 else if (MO.isGlobal()) {
683 const GlobalValue *GValue = MO.getGlobal();
684 MOSymbol = getSymbol(GValue);
685 if (GValue->getType()->getElementType()->isFunctionTy() ||
686 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
687 GValue->hasAvailableExternallyLinkage() ||
688 TM.getCodeModel() == CodeModel::Large)
689 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
693 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
695 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
696 EmitToStreamer(OutStreamer, TmpInst);
699 case PPC::ADDItocL: {
700 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
701 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
703 // Change the opcode to ADDI8. If the global address is external, then
704 // generate a TOC entry and reference that. Otherwise reference the
706 TmpInst.setOpcode(PPC::ADDI8);
707 const MachineOperand &MO = MI->getOperand(2);
708 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
709 MCSymbol *MOSymbol = nullptr;
710 bool IsExternal = false;
711 bool IsNonLocalFunction = false;
714 const GlobalValue *GV = MO.getGlobal();
715 MOSymbol = getSymbol(GV);
716 IsExternal = GV->isDeclaration();
717 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
718 (GV->isDeclaration() || GV->isWeakForLinker());
719 } else if (MO.isCPI())
720 MOSymbol = GetCPISymbol(MO.getIndex());
722 if (IsNonLocalFunction || IsExternal ||
723 TM.getCodeModel() == CodeModel::Large)
724 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
727 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
729 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
730 EmitToStreamer(OutStreamer, TmpInst);
733 case PPC::ADDISgotTprelHA: {
734 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
735 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
736 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
737 const MachineOperand &MO = MI->getOperand(2);
738 const GlobalValue *GValue = MO.getGlobal();
739 MCSymbol *MOSymbol = getSymbol(GValue);
740 const MCExpr *SymGotTprel =
741 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
743 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
744 .addReg(MI->getOperand(0).getReg())
745 .addReg(MI->getOperand(1).getReg())
746 .addExpr(SymGotTprel));
749 case PPC::LDgotTprelL:
750 case PPC::LDgotTprelL32: {
751 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
752 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
754 // Change the opcode to LD.
755 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
756 const MachineOperand &MO = MI->getOperand(1);
757 const GlobalValue *GValue = MO.getGlobal();
758 MCSymbol *MOSymbol = getSymbol(GValue);
760 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
762 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
763 EmitToStreamer(OutStreamer, TmpInst);
767 case PPC::PPC32PICGOT: {
768 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
769 MCSymbol *GOTRef = OutContext.CreateTempSymbol();
770 MCSymbol *NextInstr = OutContext.CreateTempSymbol();
772 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
773 // FIXME: We would like an efficient form for this, so we don't have to do
774 // a lot of extra uniquing.
775 .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
776 const MCExpr *OffsExpr =
777 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
778 MCSymbolRefExpr::Create(GOTRef, OutContext),
780 OutStreamer.EmitLabel(GOTRef);
781 OutStreamer.EmitValue(OffsExpr, 4);
782 OutStreamer.EmitLabel(NextInstr);
783 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
784 .addReg(MI->getOperand(0).getReg()));
785 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
786 .addReg(MI->getOperand(1).getReg())
788 .addReg(MI->getOperand(0).getReg()));
789 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
790 .addReg(MI->getOperand(0).getReg())
791 .addReg(MI->getOperand(1).getReg())
792 .addReg(MI->getOperand(0).getReg()));
795 case PPC::PPC32GOT: {
796 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
797 const MCExpr *SymGotTlsL =
798 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
800 const MCExpr *SymGotTlsHA =
801 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
803 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
804 .addReg(MI->getOperand(0).getReg())
805 .addExpr(SymGotTlsL));
806 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
807 .addReg(MI->getOperand(0).getReg())
808 .addReg(MI->getOperand(0).getReg())
809 .addExpr(SymGotTlsHA));
812 case PPC::ADDIStlsgdHA: {
813 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
814 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
815 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
816 const MachineOperand &MO = MI->getOperand(2);
817 const GlobalValue *GValue = MO.getGlobal();
818 MCSymbol *MOSymbol = getSymbol(GValue);
819 const MCExpr *SymGotTlsGD =
820 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
822 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
823 .addReg(MI->getOperand(0).getReg())
824 .addReg(MI->getOperand(1).getReg())
825 .addExpr(SymGotTlsGD));
828 case PPC::ADDItlsgdL:
829 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
830 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
831 case PPC::ADDItlsgdL32: {
832 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
833 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
834 const MachineOperand &MO = MI->getOperand(2);
835 const GlobalValue *GValue = MO.getGlobal();
836 MCSymbol *MOSymbol = getSymbol(GValue);
837 const MCExpr *SymGotTlsGD = MCSymbolRefExpr::Create(
838 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO
839 : MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
841 EmitToStreamer(OutStreamer,
842 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
843 .addReg(MI->getOperand(0).getReg())
844 .addReg(MI->getOperand(1).getReg())
845 .addExpr(SymGotTlsGD));
848 case PPC::GETtlsADDR:
849 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
850 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsgd)
851 case PPC::GETtlsADDR32: {
852 // Transform: %R3 = GETtlsADDR32 %R3, <ga:@sym>
853 // Into: BL_TLS __tls_get_addr(sym at tlsgd)@PLT
854 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSGD);
857 case PPC::ADDIStlsldHA: {
858 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
859 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
860 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
861 const MachineOperand &MO = MI->getOperand(2);
862 const GlobalValue *GValue = MO.getGlobal();
863 MCSymbol *MOSymbol = getSymbol(GValue);
864 const MCExpr *SymGotTlsLD =
865 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
867 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
868 .addReg(MI->getOperand(0).getReg())
869 .addReg(MI->getOperand(1).getReg())
870 .addExpr(SymGotTlsLD));
873 case PPC::ADDItlsldL:
874 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
875 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
876 case PPC::ADDItlsldL32: {
877 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
878 // Into: %Rd = ADDI %Rs, sym@got@tlsld
879 const MachineOperand &MO = MI->getOperand(2);
880 const GlobalValue *GValue = MO.getGlobal();
881 MCSymbol *MOSymbol = getSymbol(GValue);
882 const MCExpr *SymGotTlsLD = MCSymbolRefExpr::Create(
883 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO
884 : MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
886 EmitToStreamer(OutStreamer,
887 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
888 .addReg(MI->getOperand(0).getReg())
889 .addReg(MI->getOperand(1).getReg())
890 .addExpr(SymGotTlsLD));
893 case PPC::GETtlsldADDR:
894 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
895 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsld)
896 case PPC::GETtlsldADDR32: {
897 // Transform: %R3 = GETtlsldADDR32 %R3, <ga:@sym>
898 // Into: BL_TLS __tls_get_addr(sym at tlsld)@PLT
899 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSLD);
902 case PPC::ADDISdtprelHA:
903 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
904 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
905 case PPC::ADDISdtprelHA32: {
906 // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
907 // Into: %Rd = ADDIS %R3, sym@dtprel@ha
908 const MachineOperand &MO = MI->getOperand(2);
909 const GlobalValue *GValue = MO.getGlobal();
910 MCSymbol *MOSymbol = getSymbol(GValue);
911 const MCExpr *SymDtprel =
912 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
916 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
917 .addReg(MI->getOperand(0).getReg())
918 .addReg(Subtarget->isPPC64() ? PPC::X3 : PPC::R3)
919 .addExpr(SymDtprel));
922 case PPC::ADDIdtprelL:
923 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
924 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
925 case PPC::ADDIdtprelL32: {
926 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
927 // Into: %Rd = ADDI %Rs, sym@dtprel@l
928 const MachineOperand &MO = MI->getOperand(2);
929 const GlobalValue *GValue = MO.getGlobal();
930 MCSymbol *MOSymbol = getSymbol(GValue);
931 const MCExpr *SymDtprel =
932 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
934 EmitToStreamer(OutStreamer,
935 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
936 .addReg(MI->getOperand(0).getReg())
937 .addReg(MI->getOperand(1).getReg())
938 .addExpr(SymDtprel));
943 if (!Subtarget->hasMFOCRF()) {
944 // Transform: %R3 = MFOCRF %CR7
945 // Into: %R3 = MFCR ;; cr7
947 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
948 OutStreamer.AddComment(PPCInstPrinter::
949 getRegisterName(MI->getOperand(1).getReg()));
950 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
951 .addReg(MI->getOperand(0).getReg()));
957 if (!Subtarget->hasMFOCRF()) {
958 // Transform: %CR7 = MTOCRF %R3
959 // Into: MTCRF mask, %R3 ;; cr7
961 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
962 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
963 ->getEncodingValue(MI->getOperand(0).getReg());
964 OutStreamer.AddComment(PPCInstPrinter::
965 getRegisterName(MI->getOperand(0).getReg()));
966 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
968 .addReg(MI->getOperand(1).getReg()));
976 // Verify alignment is legal, so we don't create relocations
977 // that can't be supported.
978 // FIXME: This test is currently disabled for Darwin. The test
979 // suite shows a handful of test cases that fail this check for
980 // Darwin. Those need to be investigated before this sanity test
981 // can be enabled for those subtargets.
982 if (!Subtarget->isDarwin()) {
983 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
984 const MachineOperand &MO = MI->getOperand(OpNum);
985 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
986 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
988 // Now process the instruction normally.
993 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
994 EmitToStreamer(OutStreamer, TmpInst);
997 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
998 if (static_cast<const PPCTargetMachine &>(TM).isELFv2ABI()) {
999 PPCTargetStreamer *TS =
1000 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1003 TS->emitAbiVersion(2);
1006 if (static_cast<const PPCTargetMachine &>(TM).isPPC64() ||
1007 TM.getRelocationModel() != Reloc::PIC_)
1008 return AsmPrinter::EmitStartOfAsmFile(M);
1010 if (M.getPICLevel() == PICLevel::Small)
1011 return AsmPrinter::EmitStartOfAsmFile(M);
1013 OutStreamer.SwitchSection(OutContext.getELFSection(
1014 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));
1016 MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".LTOC"));
1017 MCSymbol *CurrentPos = OutContext.CreateTempSymbol();
1019 OutStreamer.EmitLabel(CurrentPos);
1021 // The GOT pointer points to the middle of the GOT, in order to reference the
1022 // entire 64kB range. 0x8000 is the midpoint.
1023 const MCExpr *tocExpr =
1024 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
1025 MCConstantExpr::Create(0x8000, OutContext),
1028 OutStreamer.EmitAssignment(TOCSym, tocExpr);
1030 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1033 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
1034 // linux/ppc32 - Normal entry label.
1035 if (!Subtarget->isPPC64() &&
1036 (TM.getRelocationModel() != Reloc::PIC_ ||
1037 MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
1038 return AsmPrinter::EmitFunctionEntryLabel();
1040 if (!Subtarget->isPPC64()) {
1041 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
1042 if (PPCFI->usesPICBase()) {
1043 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
1044 MCSymbol *PICBase = MF->getPICBaseSymbol();
1045 OutStreamer.EmitLabel(RelocSymbol);
1047 const MCExpr *OffsExpr =
1048 MCBinaryExpr::CreateSub(
1049 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
1051 MCSymbolRefExpr::Create(PICBase, OutContext),
1053 OutStreamer.EmitValue(OffsExpr, 4);
1054 OutStreamer.EmitLabel(CurrentFnSym);
1057 return AsmPrinter::EmitFunctionEntryLabel();
1060 // ELFv2 ABI - Normal entry label.
1061 if (Subtarget->isELFv2ABI())
1062 return AsmPrinter::EmitFunctionEntryLabel();
1064 // Emit an official procedure descriptor.
1065 MCSectionSubPair Current = OutStreamer.getCurrentSection();
1066 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(
1067 ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1068 OutStreamer.SwitchSection(Section);
1069 OutStreamer.EmitLabel(CurrentFnSym);
1070 OutStreamer.EmitValueToAlignment(8);
1071 MCSymbol *Symbol1 = CurrentFnSymForSize;
1072 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
1074 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
1076 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1077 // Generates a R_PPC64_TOC relocation for TOC base insertion.
1078 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
1079 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
1081 // Emit a null environment pointer.
1082 OutStreamer.EmitIntValue(0, 8 /* size */);
1083 OutStreamer.SwitchSection(Current.first, Current.second);
1087 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1088 const DataLayout *TD = TM.getDataLayout();
1090 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1092 PPCTargetStreamer &TS =
1093 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
1096 const MCSectionELF *Section;
1099 Section = OutStreamer.getContext().getELFSection(
1100 ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1102 Section = OutStreamer.getContext().getELFSection(
1103 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1104 OutStreamer.SwitchSection(Section);
1106 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
1107 E = TOC.end(); I != E; ++I) {
1108 OutStreamer.EmitLabel(I->second);
1109 MCSymbol *S = I->first;
1113 OutStreamer.EmitSymbolValue(S, 4);
1117 MachineModuleInfoELF &MMIELF =
1118 MMI->getObjFileInfo<MachineModuleInfoELF>();
1120 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1121 if (!Stubs.empty()) {
1122 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1123 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1125 OutStreamer.EmitLabel(Stubs[i].first);
1127 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
1129 isPPC64 ? 8 : 4/*size*/);
1133 OutStreamer.AddBlankLine();
1136 return AsmPrinter::doFinalization(M);
1139 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1140 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1141 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1142 // provide two entry points. The ABI guarantees that when calling the
1143 // local entry point, r2 is set up by the caller to contain the TOC base
1144 // for this function, and when calling the global entry point, r12 is set
1145 // up by the caller to hold the address of the global entry point. We
1146 // thus emit a prefix sequence along the following lines:
1149 // # global entry point
1150 // addis r2,r12,(.TOC.-func)@ha
1151 // addi r2,r2,(.TOC.-func)@l
1152 // .localentry func, .-func
1153 // # local entry point, followed by function body
1155 // This ensures we have r2 set up correctly while executing the function
1156 // body, no matter which entry point is called.
1157 if (Subtarget->isELFv2ABI()
1158 // Only do all that if the function uses r2 in the first place.
1159 && !MF->getRegInfo().use_empty(PPC::X2)) {
1161 MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol();
1162 OutStreamer.EmitLabel(GlobalEntryLabel);
1163 const MCSymbolRefExpr *GlobalEntryLabelExp =
1164 MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext);
1166 MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1167 const MCExpr *TOCDeltaExpr =
1168 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext),
1169 GlobalEntryLabelExp, OutContext);
1171 const MCExpr *TOCDeltaHi =
1172 PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext);
1173 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1176 .addExpr(TOCDeltaHi));
1178 const MCExpr *TOCDeltaLo =
1179 PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext);
1180 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI)
1183 .addExpr(TOCDeltaLo));
1185 MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol();
1186 OutStreamer.EmitLabel(LocalEntryLabel);
1187 const MCSymbolRefExpr *LocalEntryLabelExp =
1188 MCSymbolRefExpr::Create(LocalEntryLabel, OutContext);
1189 const MCExpr *LocalOffsetExp =
1190 MCBinaryExpr::CreateSub(LocalEntryLabelExp,
1191 GlobalEntryLabelExp, OutContext);
1193 PPCTargetStreamer *TS =
1194 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1197 TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp);
1201 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1204 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1205 // Only the 64-bit target requires a traceback table. For now,
1206 // we only emit the word of zeroes that GDB requires to find
1207 // the end of the function, and zeroes for the eight-byte
1208 // mandatory fields.
1209 // FIXME: We should fill in the eight-byte mandatory fields as described in
1210 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1211 // currently make use of these fields).
1212 if (Subtarget->isPPC64()) {
1213 OutStreamer.EmitIntValue(0, 4/*size*/);
1214 OutStreamer.EmitIntValue(0, 8/*size*/);
1218 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1219 static const char *const CPUDirectives[] = {
1243 // Get the numerically largest directive.
1244 // FIXME: How should we merge darwin directives?
1245 unsigned Directive = PPC::DIR_NONE;
1246 for (const Function &F : M) {
1247 const PPCSubtarget &STI = TM.getSubtarget<PPCSubtarget>(F);
1248 unsigned FDir = STI.getDarwinDirective();
1249 Directive = Directive > FDir ? FDir : STI.getDarwinDirective();
1250 if (STI.hasMFOCRF() && Directive < PPC::DIR_970)
1251 Directive = PPC::DIR_970;
1252 if (STI.hasAltivec() && Directive < PPC::DIR_7400)
1253 Directive = PPC::DIR_7400;
1254 if (STI.isPPC64() && Directive < PPC::DIR_64)
1255 Directive = PPC::DIR_64;
1258 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1260 assert(Directive < array_lengthof(CPUDirectives) &&
1261 "CPUDirectives[] might not be up-to-date!");
1262 PPCTargetStreamer &TStreamer =
1263 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1264 TStreamer.emitMachine(CPUDirectives[Directive]);
1266 // Prime text sections so they are adjacent. This reduces the likelihood a
1267 // large data or debug section causes a branch to exceed 16M limit.
1268 const TargetLoweringObjectFileMachO &TLOFMacho =
1269 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1270 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
1271 if (TM.getRelocationModel() == Reloc::PIC_) {
1272 OutStreamer.SwitchSection(
1273 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1274 MachO::S_SYMBOL_STUBS |
1275 MachO::S_ATTR_PURE_INSTRUCTIONS,
1276 32, SectionKind::getText()));
1277 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1278 OutStreamer.SwitchSection(
1279 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1280 MachO::S_SYMBOL_STUBS |
1281 MachO::S_ATTR_PURE_INSTRUCTIONS,
1282 16, SectionKind::getText()));
1284 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1287 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1288 // Remove $stub suffix, add $lazy_ptr.
1289 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1290 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
1293 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1294 // Add $tmp suffix to $stub, yielding $stub$tmp.
1295 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
1298 void PPCDarwinAsmPrinter::
1299 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1300 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1302 // Construct a local MCSubtargetInfo and shadow EmitToStreamer here.
1303 // This is because the MachineFunction won't exist (but have not yet been
1304 // freed) and since we're at the global level we can use the default
1305 // constructed subtarget.
1306 std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
1307 TM.getTargetTriple(), TM.getTargetCPU(), TM.getTargetFeatureString()));
1308 auto EmitToStreamer = [&STI] (MCStreamer &S, const MCInst &Inst) {
1309 S.EmitInstruction(Inst, *STI);
1312 const TargetLoweringObjectFileMachO &TLOFMacho =
1313 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1315 // .lazy_symbol_pointer
1316 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1318 // Output stubs for dynamically-linked functions
1319 if (TM.getRelocationModel() == Reloc::PIC_) {
1320 const MCSection *StubSection =
1321 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1322 MachO::S_SYMBOL_STUBS |
1323 MachO::S_ATTR_PURE_INSTRUCTIONS,
1324 32, SectionKind::getText());
1325 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1326 OutStreamer.SwitchSection(StubSection);
1329 MCSymbol *Stub = Stubs[i].first;
1330 MCSymbol *RawSym = Stubs[i].second.getPointer();
1331 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1332 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1334 OutStreamer.EmitLabel(Stub);
1335 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1337 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
1338 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1340 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
1343 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1344 // bcl 20, 31, AnonSymbol
1345 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1346 OutStreamer.EmitLabel(AnonSymbol);
1348 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1349 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1350 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, true, OutContext);
1351 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1356 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1358 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1359 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1360 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, true, OutContext);
1361 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1363 .addExpr(SubLo16).addExpr(SubLo16)
1366 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1368 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1370 OutStreamer.SwitchSection(LSPSection);
1371 OutStreamer.EmitLabel(LazyPtr);
1372 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1374 MCSymbol *DyldStubBindingHelper =
1375 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1377 // .quad dyld_stub_binding_helper
1378 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1380 // .long dyld_stub_binding_helper
1381 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1384 OutStreamer.AddBlankLine();
1388 const MCSection *StubSection =
1389 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1390 MachO::S_SYMBOL_STUBS |
1391 MachO::S_ATTR_PURE_INSTRUCTIONS,
1392 16, SectionKind::getText());
1393 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1394 MCSymbol *Stub = Stubs[i].first;
1395 MCSymbol *RawSym = Stubs[i].second.getPointer();
1396 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1397 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1399 OutStreamer.SwitchSection(StubSection);
1401 OutStreamer.EmitLabel(Stub);
1402 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1404 // lis r11, ha16(LazyPtr)
1405 const MCExpr *LazyPtrHa16 =
1406 PPCMCExpr::CreateHa(LazyPtrExpr, true, OutContext);
1407 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
1409 .addExpr(LazyPtrHa16));
1411 // ldu r12, lo16(LazyPtr)(r11)
1412 // lwzu r12, lo16(LazyPtr)(r11)
1413 const MCExpr *LazyPtrLo16 =
1414 PPCMCExpr::CreateLo(LazyPtrExpr, true, OutContext);
1415 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1417 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1421 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1423 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1425 OutStreamer.SwitchSection(LSPSection);
1426 OutStreamer.EmitLabel(LazyPtr);
1427 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1429 MCSymbol *DyldStubBindingHelper =
1430 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1432 // .quad dyld_stub_binding_helper
1433 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1435 // .long dyld_stub_binding_helper
1436 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1440 OutStreamer.AddBlankLine();
1444 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1445 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1447 // Darwin/PPC always uses mach-o.
1448 const TargetLoweringObjectFileMachO &TLOFMacho =
1449 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1450 MachineModuleInfoMachO &MMIMacho =
1451 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1453 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1455 EmitFunctionStubs(Stubs);
1457 if (MAI->doesSupportExceptionHandling() && MMI) {
1458 // Add the (possibly multiple) personalities to the set of global values.
1459 // Only referenced functions get into the Personalities list.
1460 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1461 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1462 E = Personalities.end(); I != E; ++I) {
1464 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1465 MachineModuleInfoImpl::StubValueTy &StubSym =
1466 MMIMacho.getGVStubEntry(NLPSym);
1467 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1472 // Output stubs for dynamically-linked functions.
1473 Stubs = MMIMacho.GetGVStubList();
1475 // Output macho stubs for external and common global variables.
1476 if (!Stubs.empty()) {
1477 // Switch with ".non_lazy_symbol_pointer" directive.
1478 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1479 EmitAlignment(isPPC64 ? 3 : 2);
1481 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1483 OutStreamer.EmitLabel(Stubs[i].first);
1484 // .indirect_symbol _foo
1485 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1486 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1489 // External to current translation unit.
1490 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1492 // Internal to current translation unit.
1494 // When we place the LSDA into the TEXT section, the type info pointers
1495 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1496 // However, sometimes the types are local to the file. So we need to
1497 // fill in the value for the NLP in those cases.
1498 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1500 isPPC64 ? 8 : 4/*size*/);
1504 OutStreamer.AddBlankLine();
1507 Stubs = MMIMacho.GetHiddenGVStubList();
1508 if (!Stubs.empty()) {
1509 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1510 EmitAlignment(isPPC64 ? 3 : 2);
1512 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1514 OutStreamer.EmitLabel(Stubs[i].first);
1516 OutStreamer.EmitValue(MCSymbolRefExpr::
1517 Create(Stubs[i].second.getPointer(),
1519 isPPC64 ? 8 : 4/*size*/);
1523 OutStreamer.AddBlankLine();
1526 // Funny Darwin hack: This flag tells the linker that no global symbols
1527 // contain code that falls through to other global symbols (e.g. the obvious
1528 // implementation of multiple entry points). If this doesn't occur, the
1529 // linker can safely perform dead code stripping. Since LLVM never generates
1530 // code that does this, it is always safe to set.
1531 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1533 return AsmPrinter::doFinalization(M);
1536 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1537 /// for a MachineFunction to the given output stream, in a format that the
1538 /// Darwin assembler can deal with.
1541 createPPCAsmPrinterPass(TargetMachine &tm,
1542 std::unique_ptr<MCStreamer> &&Streamer) {
1543 if (Triple(tm.getTargetTriple()).isMacOSX())
1544 return new PPCDarwinAsmPrinter(tm, std::move(Streamer));
1545 return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
1548 // Force static initialization.
1549 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1550 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1551 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1552 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);