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)),
78 Subtarget(&TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0),
81 const char *getPassName() const override {
82 return "PowerPC Assembly Printer";
85 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
87 void EmitInstruction(const MachineInstr *MI) override;
89 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
91 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
92 unsigned AsmVariant, const char *ExtraCode,
93 raw_ostream &O) override;
94 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
95 unsigned AsmVariant, const char *ExtraCode,
96 raw_ostream &O) override;
98 void EmitEndOfAsmFile(Module &M) override;
100 void LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
101 const MachineInstr &MI);
102 void LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
103 const MachineInstr &MI);
106 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
107 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
109 explicit PPCLinuxAsmPrinter(TargetMachine &TM,
110 std::unique_ptr<MCStreamer> Streamer)
111 : PPCAsmPrinter(TM, std::move(Streamer)) {}
113 const char *getPassName() const override {
114 return "Linux PPC Assembly Printer";
117 bool doFinalization(Module &M) override;
118 void EmitStartOfAsmFile(Module &M) override;
120 void EmitFunctionEntryLabel() override;
122 void EmitFunctionBodyStart() override;
123 void EmitFunctionBodyEnd() override;
126 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
128 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
130 explicit PPCDarwinAsmPrinter(TargetMachine &TM,
131 std::unique_ptr<MCStreamer> Streamer)
132 : PPCAsmPrinter(TM, std::move(Streamer)) {}
134 const char *getPassName() const override {
135 return "Darwin PPC Assembly Printer";
138 bool doFinalization(Module &M) override;
139 void EmitStartOfAsmFile(Module &M) override;
141 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
143 } // end of anonymous namespace
145 /// stripRegisterPrefix - This method strips the character prefix from a
146 /// register name so that only the number is left. Used by for linux asm.
147 static const char *stripRegisterPrefix(const char *RegName) {
148 switch (RegName[0]) {
152 if (RegName[1] == 's')
155 case 'c': if (RegName[1] == 'r') return RegName + 2;
161 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
163 const DataLayout *DL = TM.getDataLayout();
164 const MachineOperand &MO = MI->getOperand(OpNo);
166 switch (MO.getType()) {
167 case MachineOperand::MO_Register: {
168 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
169 // Linux assembler (Others?) does not take register mnemonics.
170 // FIXME - What about special registers used in mfspr/mtspr?
171 if (!Subtarget->isDarwin())
172 RegName = stripRegisterPrefix(RegName);
176 case MachineOperand::MO_Immediate:
180 case MachineOperand::MO_MachineBasicBlock:
181 O << *MO.getMBB()->getSymbol();
183 case MachineOperand::MO_ConstantPoolIndex:
184 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
185 << '_' << MO.getIndex();
187 case MachineOperand::MO_BlockAddress:
188 O << *GetBlockAddressSymbol(MO.getBlockAddress());
190 case MachineOperand::MO_GlobalAddress: {
191 // Computing the address of a global symbol, not calling it.
192 const GlobalValue *GV = MO.getGlobal();
193 MCSymbol *SymToPrint;
195 // External or weakly linked global variables need non-lazily-resolved stubs
196 if (TM.getRelocationModel() != Reloc::Static &&
197 (GV->isDeclaration() || GV->isWeakForLinker())) {
198 if (!GV->hasHiddenVisibility()) {
199 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
200 MachineModuleInfoImpl::StubValueTy &StubSym =
201 MMI->getObjFileInfo<MachineModuleInfoMachO>()
202 .getGVStubEntry(SymToPrint);
203 if (!StubSym.getPointer())
204 StubSym = MachineModuleInfoImpl::
205 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
206 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
207 GV->hasAvailableExternallyLinkage()) {
208 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
210 MachineModuleInfoImpl::StubValueTy &StubSym =
211 MMI->getObjFileInfo<MachineModuleInfoMachO>().
212 getHiddenGVStubEntry(SymToPrint);
213 if (!StubSym.getPointer())
214 StubSym = MachineModuleInfoImpl::
215 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
217 SymToPrint = getSymbol(GV);
220 SymToPrint = getSymbol(GV);
225 printOffset(MO.getOffset(), O);
230 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
235 /// PrintAsmOperand - Print out an operand for an inline asm expression.
237 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
239 const char *ExtraCode, raw_ostream &O) {
240 // Does this asm operand have a single letter operand modifier?
241 if (ExtraCode && ExtraCode[0]) {
242 if (ExtraCode[1] != 0) return true; // Unknown modifier.
244 switch (ExtraCode[0]) {
246 // See if this is a generic print operand
247 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
248 case 'c': // Don't print "$" before a global var name or constant.
249 break; // PPC never has a prefix.
250 case 'L': // Write second word of DImode reference.
251 // Verify that this operand has two consecutive registers.
252 if (!MI->getOperand(OpNo).isReg() ||
253 OpNo+1 == MI->getNumOperands() ||
254 !MI->getOperand(OpNo+1).isReg())
256 ++OpNo; // Return the high-part.
259 // Write 'i' if an integer constant, otherwise nothing. Used to print
261 if (MI->getOperand(OpNo).isImm())
267 printOperand(MI, OpNo, O);
271 // At the moment, all inline asm memory operands are a single register.
272 // In any case, the output of this routine should always be just one
273 // assembler operand.
275 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
277 const char *ExtraCode,
279 if (ExtraCode && ExtraCode[0]) {
280 if (ExtraCode[1] != 0) return true; // Unknown modifier.
282 switch (ExtraCode[0]) {
283 default: return true; // Unknown modifier.
284 case 'y': // A memory reference for an X-form instruction
286 const char *RegName = "r0";
287 if (!Subtarget->isDarwin())
288 RegName = stripRegisterPrefix(RegName);
289 O << RegName << ", ";
290 printOperand(MI, OpNo, O);
293 case 'U': // Print 'u' for update form.
294 case 'X': // Print 'x' for indexed form.
296 // FIXME: Currently for PowerPC memory operands are always loaded
297 // into a register, so we never get an update or indexed form.
298 // This is bad even for offset forms, since even if we know we
299 // have a value in -16(r1), we will generate a load into r<n>
300 // and then load from 0(r<n>). Until that issue is fixed,
301 // tolerate 'U' and 'X' but don't output anything.
302 assert(MI->getOperand(OpNo).isReg());
308 assert(MI->getOperand(OpNo).isReg());
310 printOperand(MI, OpNo, O);
316 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
317 /// exists for it. If not, create one. Then return a symbol that references
319 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
320 const DataLayout *DL = TM.getDataLayout();
321 MCSymbol *&TOCEntry = TOC[Sym];
323 // To avoid name clash check if the name already exists.
325 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
326 "C" + Twine(TOCLabelID++)) == nullptr) {
327 TOCEntry = GetTempSymbol("C", TOCLabelID);
334 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
335 SM.serializeToStackMapSection();
338 void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
339 const MachineInstr &MI) {
340 unsigned NumNOPBytes = MI.getOperand(1).getImm();
342 SM.recordStackMap(MI);
343 assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
345 // Scan ahead to trim the shadow.
346 const MachineBasicBlock &MBB = *MI.getParent();
347 MachineBasicBlock::const_iterator MII(MI);
349 while (NumNOPBytes > 0) {
350 if (MII == MBB.end() || MII->isCall() ||
351 MII->getOpcode() == PPC::DBG_VALUE ||
352 MII->getOpcode() == TargetOpcode::PATCHPOINT ||
353 MII->getOpcode() == TargetOpcode::STACKMAP)
360 for (unsigned i = 0; i < NumNOPBytes; i += 4)
361 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
364 // Lower a patchpoint of the form:
365 // [<def>], <id>, <numBytes>, <target>, <numArgs>
366 void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
367 const MachineInstr &MI) {
368 SM.recordPatchPoint(MI);
369 PatchPointOpers Opers(&MI);
371 int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
372 unsigned EncodedBytes = 0;
374 assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
375 "High 16 bits of call target should be zero.");
376 unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
378 // Materialize the jump address:
379 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8)
381 .addImm((CallTarget >> 32) & 0xFFFF));
382 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC)
385 .addImm(32).addImm(16));
386 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8)
389 .addImm((CallTarget >> 16) & 0xFFFF));
390 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8)
393 .addImm(CallTarget & 0xFFFF));
395 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg));
396 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8));
400 unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
401 assert(NumBytes >= EncodedBytes &&
402 "Patchpoint can't request size less than the length of a call.");
403 assert((NumBytes - EncodedBytes) % 4 == 0 &&
404 "Invalid number of NOP bytes requested!");
405 for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
406 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
409 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
410 /// the current output stream.
412 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
414 bool isPPC64 = Subtarget->isPPC64();
415 bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
416 const Module *M = MF->getFunction()->getParent();
417 PICLevel::Level PL = M->getPICLevel();
419 // Lower multi-instruction pseudo operations.
420 switch (MI->getOpcode()) {
422 case TargetOpcode::DBG_VALUE:
423 llvm_unreachable("Should be handled target independently");
424 case TargetOpcode::STACKMAP:
425 return LowerSTACKMAP(OutStreamer, SM, *MI);
426 case TargetOpcode::PATCHPOINT:
427 return LowerPATCHPOINT(OutStreamer, SM, *MI);
429 case PPC::MoveGOTtoLR: {
430 // Transform %LR = MoveGOTtoLR
431 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
432 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
433 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
435 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
436 MCSymbol *GOTSymbol =
437 OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
438 const MCExpr *OffsExpr =
439 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol,
440 MCSymbolRefExpr::VK_PPC_LOCAL,
442 MCConstantExpr::Create(4, OutContext),
446 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
449 case PPC::MovePCtoLR:
450 case PPC::MovePCtoLR8: {
451 // Transform %LR = MovePCtoLR
452 // Into this, where the label is the PIC base:
455 MCSymbol *PICBase = MF->getPICBaseSymbol();
458 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
459 // FIXME: We would like an efficient form for this, so we don't have to do
460 // a lot of extra uniquing.
461 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
464 OutStreamer.EmitLabel(PICBase);
467 case PPC::UpdateGBR: {
468 // Transform %Rd = UpdateGBR(%Rt, %Ri)
469 // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
471 // Get the offset from the GOT Base Register to the GOT
472 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
473 MCSymbol *PICOffset =
474 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
475 TmpInst.setOpcode(PPC::LWZ);
477 MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
479 MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
480 MCSymbolRefExpr::VK_None,
482 const MCOperand TR = TmpInst.getOperand(1);
483 const MCOperand PICR = TmpInst.getOperand(0);
485 // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
486 TmpInst.getOperand(1) =
487 MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp, PB, OutContext));
488 TmpInst.getOperand(0) = TR;
489 TmpInst.getOperand(2) = PICR;
490 EmitToStreamer(OutStreamer, TmpInst);
492 TmpInst.setOpcode(PPC::ADD4);
493 TmpInst.getOperand(0) = PICR;
494 TmpInst.getOperand(1) = TR;
495 TmpInst.getOperand(2) = PICR;
496 EmitToStreamer(OutStreamer, TmpInst);
500 // Transform %R3 = LWZtoc <ga:@min1>, %R2
501 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
503 // Change the opcode to LWZ, and the global address operand to be a
504 // reference to the GOT entry we will synthesize later.
505 TmpInst.setOpcode(PPC::LWZ);
506 const MachineOperand &MO = MI->getOperand(1);
508 // Map symbol -> label of TOC entry
509 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
510 MCSymbol *MOSymbol = nullptr;
512 MOSymbol = getSymbol(MO.getGlobal());
514 MOSymbol = GetCPISymbol(MO.getIndex());
516 MOSymbol = GetJTISymbol(MO.getIndex());
517 else if (MO.isBlockAddress())
518 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
520 if (PL == PICLevel::Small) {
522 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_GOT,
524 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
526 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
529 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
532 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
534 Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
535 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
537 EmitToStreamer(OutStreamer, TmpInst);
544 // Transform %X3 = LDtoc <ga:@min1>, %X2
545 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
547 // Change the opcode to LD, and the global address operand to be a
548 // reference to the TOC entry we will synthesize later.
549 TmpInst.setOpcode(PPC::LD);
550 const MachineOperand &MO = MI->getOperand(1);
552 // Map symbol -> label of TOC entry
553 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
554 MCSymbol *MOSymbol = nullptr;
556 MOSymbol = getSymbol(MO.getGlobal());
558 MOSymbol = GetCPISymbol(MO.getIndex());
560 MOSymbol = GetJTISymbol(MO.getIndex());
561 else if (MO.isBlockAddress())
562 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
564 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
567 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
569 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
570 EmitToStreamer(OutStreamer, TmpInst);
574 case PPC::ADDIStocHA: {
575 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
576 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
578 // Change the opcode to ADDIS8. If the global address is external, has
579 // common linkage, is a non-local function address, or is a jump table
580 // address, then generate a TOC entry and reference that. Otherwise
581 // reference the symbol directly.
582 TmpInst.setOpcode(PPC::ADDIS8);
583 const MachineOperand &MO = MI->getOperand(2);
584 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
585 MO.isBlockAddress()) &&
586 "Invalid operand for ADDIStocHA!");
587 MCSymbol *MOSymbol = nullptr;
588 bool IsExternal = false;
589 bool IsNonLocalFunction = false;
590 bool IsCommon = false;
591 bool IsAvailExt = false;
594 const GlobalValue *GV = MO.getGlobal();
595 MOSymbol = getSymbol(GV);
596 IsExternal = GV->isDeclaration();
597 IsCommon = GV->hasCommonLinkage();
598 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
599 (GV->isDeclaration() || GV->isWeakForLinker());
600 IsAvailExt = GV->hasAvailableExternallyLinkage();
601 } else if (MO.isCPI())
602 MOSymbol = GetCPISymbol(MO.getIndex());
604 MOSymbol = GetJTISymbol(MO.getIndex());
605 else if (MO.isBlockAddress())
606 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
608 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
609 MO.isJTI() || MO.isBlockAddress() ||
610 TM.getCodeModel() == CodeModel::Large)
611 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
614 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
616 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
617 EmitToStreamer(OutStreamer, TmpInst);
621 // Transform %Xd = LDtocL <ga:@sym>, %Xs
622 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
624 // Change the opcode to LD. If the global address is external, has
625 // common linkage, or is a jump table address, then reference the
626 // associated TOC entry. Otherwise reference the symbol directly.
627 TmpInst.setOpcode(PPC::LD);
628 const MachineOperand &MO = MI->getOperand(1);
629 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
630 MO.isBlockAddress()) &&
631 "Invalid operand for LDtocL!");
632 MCSymbol *MOSymbol = nullptr;
635 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
636 else if (MO.isBlockAddress()) {
637 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
638 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
640 else if (MO.isCPI()) {
641 MOSymbol = GetCPISymbol(MO.getIndex());
642 if (TM.getCodeModel() == CodeModel::Large)
643 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
645 else if (MO.isGlobal()) {
646 const GlobalValue *GValue = MO.getGlobal();
647 MOSymbol = getSymbol(GValue);
648 if (GValue->getType()->getElementType()->isFunctionTy() ||
649 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
650 GValue->hasAvailableExternallyLinkage() ||
651 TM.getCodeModel() == CodeModel::Large)
652 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
656 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
658 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
659 EmitToStreamer(OutStreamer, TmpInst);
662 case PPC::ADDItocL: {
663 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
664 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
666 // Change the opcode to ADDI8. If the global address is external, then
667 // generate a TOC entry and reference that. Otherwise reference the
669 TmpInst.setOpcode(PPC::ADDI8);
670 const MachineOperand &MO = MI->getOperand(2);
671 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
672 MCSymbol *MOSymbol = nullptr;
673 bool IsExternal = false;
674 bool IsNonLocalFunction = false;
677 const GlobalValue *GV = MO.getGlobal();
678 MOSymbol = getSymbol(GV);
679 IsExternal = GV->isDeclaration();
680 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
681 (GV->isDeclaration() || GV->isWeakForLinker());
682 } else if (MO.isCPI())
683 MOSymbol = GetCPISymbol(MO.getIndex());
685 if (IsNonLocalFunction || IsExternal ||
686 TM.getCodeModel() == CodeModel::Large)
687 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
690 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
692 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
693 EmitToStreamer(OutStreamer, TmpInst);
696 case PPC::ADDISgotTprelHA: {
697 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
698 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
699 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
700 const MachineOperand &MO = MI->getOperand(2);
701 const GlobalValue *GValue = MO.getGlobal();
702 MCSymbol *MOSymbol = getSymbol(GValue);
703 const MCExpr *SymGotTprel =
704 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
706 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
707 .addReg(MI->getOperand(0).getReg())
708 .addReg(MI->getOperand(1).getReg())
709 .addExpr(SymGotTprel));
712 case PPC::LDgotTprelL:
713 case PPC::LDgotTprelL32: {
714 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
715 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
717 // Change the opcode to LD.
718 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
719 const MachineOperand &MO = MI->getOperand(1);
720 const GlobalValue *GValue = MO.getGlobal();
721 MCSymbol *MOSymbol = getSymbol(GValue);
723 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
725 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
726 EmitToStreamer(OutStreamer, TmpInst);
730 case PPC::PPC32PICGOT: {
731 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
732 MCSymbol *GOTRef = OutContext.CreateTempSymbol();
733 MCSymbol *NextInstr = OutContext.CreateTempSymbol();
735 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
736 // FIXME: We would like an efficient form for this, so we don't have to do
737 // a lot of extra uniquing.
738 .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
739 const MCExpr *OffsExpr =
740 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
741 MCSymbolRefExpr::Create(GOTRef, OutContext),
743 OutStreamer.EmitLabel(GOTRef);
744 OutStreamer.EmitValue(OffsExpr, 4);
745 OutStreamer.EmitLabel(NextInstr);
746 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
747 .addReg(MI->getOperand(0).getReg()));
748 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
749 .addReg(MI->getOperand(1).getReg())
751 .addReg(MI->getOperand(0).getReg()));
752 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
753 .addReg(MI->getOperand(0).getReg())
754 .addReg(MI->getOperand(1).getReg())
755 .addReg(MI->getOperand(0).getReg()));
758 case PPC::PPC32GOT: {
759 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
760 const MCExpr *SymGotTlsL =
761 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
763 const MCExpr *SymGotTlsHA =
764 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
766 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
767 .addReg(MI->getOperand(0).getReg())
768 .addExpr(SymGotTlsL));
769 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
770 .addReg(MI->getOperand(0).getReg())
771 .addReg(MI->getOperand(0).getReg())
772 .addExpr(SymGotTlsHA));
775 case PPC::ADDIStlsgdHA: {
776 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
777 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
778 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
779 const MachineOperand &MO = MI->getOperand(2);
780 const GlobalValue *GValue = MO.getGlobal();
781 MCSymbol *MOSymbol = getSymbol(GValue);
782 const MCExpr *SymGotTlsGD =
783 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
785 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
786 .addReg(MI->getOperand(0).getReg())
787 .addReg(MI->getOperand(1).getReg())
788 .addExpr(SymGotTlsGD));
791 case PPC::ADDItlsgdL:
792 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
793 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
794 case PPC::ADDItlsgdL32: {
795 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
796 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
797 const MachineOperand &MO = MI->getOperand(2);
798 const GlobalValue *GValue = MO.getGlobal();
799 MCSymbol *MOSymbol = getSymbol(GValue);
800 const MCExpr *SymGotTlsGD = MCSymbolRefExpr::Create(
801 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO
802 : MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
804 EmitToStreamer(OutStreamer,
805 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
806 .addReg(MI->getOperand(0).getReg())
807 .addReg(MI->getOperand(1).getReg())
808 .addExpr(SymGotTlsGD));
811 case PPC::ADDIStlsldHA: {
812 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
813 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
814 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
815 const MachineOperand &MO = MI->getOperand(2);
816 const GlobalValue *GValue = MO.getGlobal();
817 MCSymbol *MOSymbol = getSymbol(GValue);
818 const MCExpr *SymGotTlsLD =
819 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
821 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
822 .addReg(MI->getOperand(0).getReg())
823 .addReg(MI->getOperand(1).getReg())
824 .addExpr(SymGotTlsLD));
827 case PPC::ADDItlsldL:
828 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
829 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
830 case PPC::ADDItlsldL32: {
831 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
832 // Into: %Rd = ADDI %Rs, sym@got@tlsld
833 const MachineOperand &MO = MI->getOperand(2);
834 const GlobalValue *GValue = MO.getGlobal();
835 MCSymbol *MOSymbol = getSymbol(GValue);
836 const MCExpr *SymGotTlsLD = MCSymbolRefExpr::Create(
837 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO
838 : MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
840 EmitToStreamer(OutStreamer,
841 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
842 .addReg(MI->getOperand(0).getReg())
843 .addReg(MI->getOperand(1).getReg())
844 .addExpr(SymGotTlsLD));
847 case PPC::ADDISdtprelHA:
848 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
849 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
850 case PPC::ADDISdtprelHA32: {
851 // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
852 // Into: %Rd = ADDIS %R3, sym@dtprel@ha
853 const MachineOperand &MO = MI->getOperand(2);
854 const GlobalValue *GValue = MO.getGlobal();
855 MCSymbol *MOSymbol = getSymbol(GValue);
856 const MCExpr *SymDtprel =
857 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
861 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
862 .addReg(MI->getOperand(0).getReg())
863 .addReg(Subtarget->isPPC64() ? PPC::X3 : PPC::R3)
864 .addExpr(SymDtprel));
867 case PPC::ADDIdtprelL:
868 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
869 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
870 case PPC::ADDIdtprelL32: {
871 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
872 // Into: %Rd = ADDI %Rs, sym@dtprel@l
873 const MachineOperand &MO = MI->getOperand(2);
874 const GlobalValue *GValue = MO.getGlobal();
875 MCSymbol *MOSymbol = getSymbol(GValue);
876 const MCExpr *SymDtprel =
877 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
879 EmitToStreamer(OutStreamer,
880 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
881 .addReg(MI->getOperand(0).getReg())
882 .addReg(MI->getOperand(1).getReg())
883 .addExpr(SymDtprel));
888 if (!Subtarget->hasMFOCRF()) {
889 // Transform: %R3 = MFOCRF %CR7
890 // Into: %R3 = MFCR ;; cr7
892 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
893 OutStreamer.AddComment(PPCInstPrinter::
894 getRegisterName(MI->getOperand(1).getReg()));
895 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
896 .addReg(MI->getOperand(0).getReg()));
902 if (!Subtarget->hasMFOCRF()) {
903 // Transform: %CR7 = MTOCRF %R3
904 // Into: MTCRF mask, %R3 ;; cr7
906 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
907 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
908 ->getEncodingValue(MI->getOperand(0).getReg());
909 OutStreamer.AddComment(PPCInstPrinter::
910 getRegisterName(MI->getOperand(0).getReg()));
911 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
913 .addReg(MI->getOperand(1).getReg()));
921 // Verify alignment is legal, so we don't create relocations
922 // that can't be supported.
923 // FIXME: This test is currently disabled for Darwin. The test
924 // suite shows a handful of test cases that fail this check for
925 // Darwin. Those need to be investigated before this sanity test
926 // can be enabled for those subtargets.
927 if (!Subtarget->isDarwin()) {
928 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
929 const MachineOperand &MO = MI->getOperand(OpNum);
930 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
931 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
933 // Now process the instruction normally.
938 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
939 EmitToStreamer(OutStreamer, TmpInst);
942 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
943 if (Subtarget->isELFv2ABI()) {
944 PPCTargetStreamer *TS =
945 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
948 TS->emitAbiVersion(2);
951 if (Subtarget->isPPC64() || TM.getRelocationModel() != Reloc::PIC_)
952 return AsmPrinter::EmitStartOfAsmFile(M);
954 if (M.getPICLevel() == PICLevel::Small)
955 return AsmPrinter::EmitStartOfAsmFile(M);
957 OutStreamer.SwitchSection(OutContext.getELFSection(
958 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));
960 MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".LTOC"));
961 MCSymbol *CurrentPos = OutContext.CreateTempSymbol();
963 OutStreamer.EmitLabel(CurrentPos);
965 // The GOT pointer points to the middle of the GOT, in order to reference the
966 // entire 64kB range. 0x8000 is the midpoint.
967 const MCExpr *tocExpr =
968 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
969 MCConstantExpr::Create(0x8000, OutContext),
972 OutStreamer.EmitAssignment(TOCSym, tocExpr);
974 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
977 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
978 // linux/ppc32 - Normal entry label.
979 if (!Subtarget->isPPC64() &&
980 (TM.getRelocationModel() != Reloc::PIC_ ||
981 MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
982 return AsmPrinter::EmitFunctionEntryLabel();
984 if (!Subtarget->isPPC64()) {
985 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
986 if (PPCFI->usesPICBase()) {
987 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
988 MCSymbol *PICBase = MF->getPICBaseSymbol();
989 OutStreamer.EmitLabel(RelocSymbol);
991 const MCExpr *OffsExpr =
992 MCBinaryExpr::CreateSub(
993 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
995 MCSymbolRefExpr::Create(PICBase, OutContext),
997 OutStreamer.EmitValue(OffsExpr, 4);
998 OutStreamer.EmitLabel(CurrentFnSym);
1001 return AsmPrinter::EmitFunctionEntryLabel();
1004 // ELFv2 ABI - Normal entry label.
1005 if (Subtarget->isELFv2ABI())
1006 return AsmPrinter::EmitFunctionEntryLabel();
1008 // Emit an official procedure descriptor.
1009 MCSectionSubPair Current = OutStreamer.getCurrentSection();
1010 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(
1011 ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1012 OutStreamer.SwitchSection(Section);
1013 OutStreamer.EmitLabel(CurrentFnSym);
1014 OutStreamer.EmitValueToAlignment(8);
1016 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
1017 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
1019 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
1021 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1022 // Generates a R_PPC64_TOC relocation for TOC base insertion.
1023 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
1024 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
1026 // Emit a null environment pointer.
1027 OutStreamer.EmitIntValue(0, 8 /* size */);
1028 OutStreamer.SwitchSection(Current.first, Current.second);
1030 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
1031 ".L." + Twine(CurrentFnSym->getName()));
1032 OutStreamer.EmitLabel(RealFnSym);
1033 CurrentFnSymForSize = RealFnSym;
1037 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1038 const DataLayout *TD = TM.getDataLayout();
1040 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1042 PPCTargetStreamer &TS =
1043 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
1046 const MCSectionELF *Section;
1049 Section = OutStreamer.getContext().getELFSection(
1050 ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1052 Section = OutStreamer.getContext().getELFSection(
1053 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1054 OutStreamer.SwitchSection(Section);
1056 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
1057 E = TOC.end(); I != E; ++I) {
1058 OutStreamer.EmitLabel(I->second);
1059 MCSymbol *S = I->first;
1063 OutStreamer.EmitSymbolValue(S, 4);
1067 MachineModuleInfoELF &MMIELF =
1068 MMI->getObjFileInfo<MachineModuleInfoELF>();
1070 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1071 if (!Stubs.empty()) {
1072 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1073 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1075 OutStreamer.EmitLabel(Stubs[i].first);
1077 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
1079 isPPC64 ? 8 : 4/*size*/);
1083 OutStreamer.AddBlankLine();
1086 return AsmPrinter::doFinalization(M);
1089 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1090 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1091 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1092 // provide two entry points. The ABI guarantees that when calling the
1093 // local entry point, r2 is set up by the caller to contain the TOC base
1094 // for this function, and when calling the global entry point, r12 is set
1095 // up by the caller to hold the address of the global entry point. We
1096 // thus emit a prefix sequence along the following lines:
1099 // # global entry point
1100 // addis r2,r12,(.TOC.-func)@ha
1101 // addi r2,r2,(.TOC.-func)@l
1102 // .localentry func, .-func
1103 // # local entry point, followed by function body
1105 // This ensures we have r2 set up correctly while executing the function
1106 // body, no matter which entry point is called.
1107 if (Subtarget->isELFv2ABI()
1108 // Only do all that if the function uses r2 in the first place.
1109 && !MF->getRegInfo().use_empty(PPC::X2)) {
1111 MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol();
1112 OutStreamer.EmitLabel(GlobalEntryLabel);
1113 const MCSymbolRefExpr *GlobalEntryLabelExp =
1114 MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext);
1116 MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1117 const MCExpr *TOCDeltaExpr =
1118 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext),
1119 GlobalEntryLabelExp, OutContext);
1121 const MCExpr *TOCDeltaHi =
1122 PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext);
1123 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1126 .addExpr(TOCDeltaHi));
1128 const MCExpr *TOCDeltaLo =
1129 PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext);
1130 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI)
1133 .addExpr(TOCDeltaLo));
1135 MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol();
1136 OutStreamer.EmitLabel(LocalEntryLabel);
1137 const MCSymbolRefExpr *LocalEntryLabelExp =
1138 MCSymbolRefExpr::Create(LocalEntryLabel, OutContext);
1139 const MCExpr *LocalOffsetExp =
1140 MCBinaryExpr::CreateSub(LocalEntryLabelExp,
1141 GlobalEntryLabelExp, OutContext);
1143 PPCTargetStreamer *TS =
1144 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1147 TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp);
1151 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1154 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1155 // Only the 64-bit target requires a traceback table. For now,
1156 // we only emit the word of zeroes that GDB requires to find
1157 // the end of the function, and zeroes for the eight-byte
1158 // mandatory fields.
1159 // FIXME: We should fill in the eight-byte mandatory fields as described in
1160 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1161 // currently make use of these fields).
1162 if (Subtarget->isPPC64()) {
1163 OutStreamer.EmitIntValue(0, 4/*size*/);
1164 OutStreamer.EmitIntValue(0, 8/*size*/);
1168 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1169 static const char *const CPUDirectives[] = {
1193 unsigned Directive = Subtarget->getDarwinDirective();
1194 if (Subtarget->hasMFOCRF() && Directive < PPC::DIR_970)
1195 Directive = PPC::DIR_970;
1196 if (Subtarget->hasAltivec() && Directive < PPC::DIR_7400)
1197 Directive = PPC::DIR_7400;
1198 if (Subtarget->isPPC64() && Directive < PPC::DIR_64)
1199 Directive = PPC::DIR_64;
1200 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1202 assert(Directive < array_lengthof(CPUDirectives) &&
1203 "CPUDirectives[] might not be up-to-date!");
1204 PPCTargetStreamer &TStreamer =
1205 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1206 TStreamer.emitMachine(CPUDirectives[Directive]);
1208 // Prime text sections so they are adjacent. This reduces the likelihood a
1209 // large data or debug section causes a branch to exceed 16M limit.
1210 const TargetLoweringObjectFileMachO &TLOFMacho =
1211 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1212 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
1213 if (TM.getRelocationModel() == Reloc::PIC_) {
1214 OutStreamer.SwitchSection(
1215 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1216 MachO::S_SYMBOL_STUBS |
1217 MachO::S_ATTR_PURE_INSTRUCTIONS,
1218 32, SectionKind::getText()));
1219 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1220 OutStreamer.SwitchSection(
1221 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1222 MachO::S_SYMBOL_STUBS |
1223 MachO::S_ATTR_PURE_INSTRUCTIONS,
1224 16, SectionKind::getText()));
1226 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1229 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1230 // Remove $stub suffix, add $lazy_ptr.
1231 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1232 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
1235 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1236 // Add $tmp suffix to $stub, yielding $stub$tmp.
1237 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
1240 void PPCDarwinAsmPrinter::
1241 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1242 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1243 bool isDarwin = Subtarget->isDarwin();
1245 const TargetLoweringObjectFileMachO &TLOFMacho =
1246 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1248 // .lazy_symbol_pointer
1249 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1251 // Output stubs for dynamically-linked functions
1252 if (TM.getRelocationModel() == Reloc::PIC_) {
1253 const MCSection *StubSection =
1254 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1255 MachO::S_SYMBOL_STUBS |
1256 MachO::S_ATTR_PURE_INSTRUCTIONS,
1257 32, SectionKind::getText());
1258 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1259 OutStreamer.SwitchSection(StubSection);
1262 MCSymbol *Stub = Stubs[i].first;
1263 MCSymbol *RawSym = Stubs[i].second.getPointer();
1264 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1265 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1267 OutStreamer.EmitLabel(Stub);
1268 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1270 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
1271 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1273 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
1276 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1277 // bcl 20, 31, AnonSymbol
1278 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1279 OutStreamer.EmitLabel(AnonSymbol);
1281 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1282 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1283 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
1284 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1289 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1291 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1292 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1293 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
1294 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1296 .addExpr(SubLo16).addExpr(SubLo16)
1299 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1301 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1303 OutStreamer.SwitchSection(LSPSection);
1304 OutStreamer.EmitLabel(LazyPtr);
1305 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1307 MCSymbol *DyldStubBindingHelper =
1308 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1310 // .quad dyld_stub_binding_helper
1311 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1313 // .long dyld_stub_binding_helper
1314 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1317 OutStreamer.AddBlankLine();
1321 const MCSection *StubSection =
1322 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1323 MachO::S_SYMBOL_STUBS |
1324 MachO::S_ATTR_PURE_INSTRUCTIONS,
1325 16, SectionKind::getText());
1326 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1327 MCSymbol *Stub = Stubs[i].first;
1328 MCSymbol *RawSym = Stubs[i].second.getPointer();
1329 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1330 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1332 OutStreamer.SwitchSection(StubSection);
1334 OutStreamer.EmitLabel(Stub);
1335 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1337 // lis r11, ha16(LazyPtr)
1338 const MCExpr *LazyPtrHa16 =
1339 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
1340 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
1342 .addExpr(LazyPtrHa16));
1344 // ldu r12, lo16(LazyPtr)(r11)
1345 // lwzu r12, lo16(LazyPtr)(r11)
1346 const MCExpr *LazyPtrLo16 =
1347 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1348 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1350 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1354 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1356 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1358 OutStreamer.SwitchSection(LSPSection);
1359 OutStreamer.EmitLabel(LazyPtr);
1360 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1362 MCSymbol *DyldStubBindingHelper =
1363 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1365 // .quad dyld_stub_binding_helper
1366 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1368 // .long dyld_stub_binding_helper
1369 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1373 OutStreamer.AddBlankLine();
1377 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1378 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1380 // Darwin/PPC always uses mach-o.
1381 const TargetLoweringObjectFileMachO &TLOFMacho =
1382 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1383 MachineModuleInfoMachO &MMIMacho =
1384 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1386 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1388 EmitFunctionStubs(Stubs);
1390 if (MAI->doesSupportExceptionHandling() && MMI) {
1391 // Add the (possibly multiple) personalities to the set of global values.
1392 // Only referenced functions get into the Personalities list.
1393 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1394 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1395 E = Personalities.end(); I != E; ++I) {
1397 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1398 MachineModuleInfoImpl::StubValueTy &StubSym =
1399 MMIMacho.getGVStubEntry(NLPSym);
1400 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1405 // Output stubs for dynamically-linked functions.
1406 Stubs = MMIMacho.GetGVStubList();
1408 // Output macho stubs for external and common global variables.
1409 if (!Stubs.empty()) {
1410 // Switch with ".non_lazy_symbol_pointer" directive.
1411 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1412 EmitAlignment(isPPC64 ? 3 : 2);
1414 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1416 OutStreamer.EmitLabel(Stubs[i].first);
1417 // .indirect_symbol _foo
1418 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1419 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1422 // External to current translation unit.
1423 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1425 // Internal to current translation unit.
1427 // When we place the LSDA into the TEXT section, the type info pointers
1428 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1429 // However, sometimes the types are local to the file. So we need to
1430 // fill in the value for the NLP in those cases.
1431 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1433 isPPC64 ? 8 : 4/*size*/);
1437 OutStreamer.AddBlankLine();
1440 Stubs = MMIMacho.GetHiddenGVStubList();
1441 if (!Stubs.empty()) {
1442 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1443 EmitAlignment(isPPC64 ? 3 : 2);
1445 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1447 OutStreamer.EmitLabel(Stubs[i].first);
1449 OutStreamer.EmitValue(MCSymbolRefExpr::
1450 Create(Stubs[i].second.getPointer(),
1452 isPPC64 ? 8 : 4/*size*/);
1456 OutStreamer.AddBlankLine();
1459 // Funny Darwin hack: This flag tells the linker that no global symbols
1460 // contain code that falls through to other global symbols (e.g. the obvious
1461 // implementation of multiple entry points). If this doesn't occur, the
1462 // linker can safely perform dead code stripping. Since LLVM never generates
1463 // code that does this, it is always safe to set.
1464 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1466 return AsmPrinter::doFinalization(M);
1469 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1470 /// for a MachineFunction to the given output stream, in a format that the
1471 /// Darwin assembler can deal with.
1474 createPPCAsmPrinterPass(TargetMachine &tm,
1475 std::unique_ptr<MCStreamer> &&Streamer) {
1476 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1478 if (Subtarget->isDarwin())
1479 return new PPCDarwinAsmPrinter(tm, std::move(Streamer));
1480 return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
1483 // Force static initialization.
1484 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1485 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1486 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1487 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);