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]) {
155 if (RegName[1] == 's')
158 case 'c': if (RegName[1] == 'r') return RegName + 2;
164 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
166 const DataLayout *DL = TM.getDataLayout();
167 const MachineOperand &MO = MI->getOperand(OpNo);
169 switch (MO.getType()) {
170 case MachineOperand::MO_Register: {
171 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
172 // Linux assembler (Others?) does not take register mnemonics.
173 // FIXME - What about special registers used in mfspr/mtspr?
174 if (!Subtarget->isDarwin())
175 RegName = stripRegisterPrefix(RegName);
179 case MachineOperand::MO_Immediate:
183 case MachineOperand::MO_MachineBasicBlock:
184 O << *MO.getMBB()->getSymbol();
186 case MachineOperand::MO_ConstantPoolIndex:
187 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
188 << '_' << MO.getIndex();
190 case MachineOperand::MO_BlockAddress:
191 O << *GetBlockAddressSymbol(MO.getBlockAddress());
193 case MachineOperand::MO_GlobalAddress: {
194 // Computing the address of a global symbol, not calling it.
195 const GlobalValue *GV = MO.getGlobal();
196 MCSymbol *SymToPrint;
198 // External or weakly linked global variables need non-lazily-resolved stubs
199 if (TM.getRelocationModel() != Reloc::Static &&
200 (GV->isDeclaration() || GV->isWeakForLinker())) {
201 if (!GV->hasHiddenVisibility()) {
202 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
203 MachineModuleInfoImpl::StubValueTy &StubSym =
204 MMI->getObjFileInfo<MachineModuleInfoMachO>()
205 .getGVStubEntry(SymToPrint);
206 if (!StubSym.getPointer())
207 StubSym = MachineModuleInfoImpl::
208 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
209 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
210 GV->hasAvailableExternallyLinkage()) {
211 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
213 MachineModuleInfoImpl::StubValueTy &StubSym =
214 MMI->getObjFileInfo<MachineModuleInfoMachO>().
215 getHiddenGVStubEntry(SymToPrint);
216 if (!StubSym.getPointer())
217 StubSym = MachineModuleInfoImpl::
218 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
220 SymToPrint = getSymbol(GV);
223 SymToPrint = getSymbol(GV);
228 printOffset(MO.getOffset(), O);
233 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
238 /// PrintAsmOperand - Print out an operand for an inline asm expression.
240 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
242 const char *ExtraCode, raw_ostream &O) {
243 // Does this asm operand have a single letter operand modifier?
244 if (ExtraCode && ExtraCode[0]) {
245 if (ExtraCode[1] != 0) return true; // Unknown modifier.
247 switch (ExtraCode[0]) {
249 // See if this is a generic print operand
250 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
251 case 'c': // Don't print "$" before a global var name or constant.
252 break; // PPC never has a prefix.
253 case 'L': // Write second word of DImode reference.
254 // Verify that this operand has two consecutive registers.
255 if (!MI->getOperand(OpNo).isReg() ||
256 OpNo+1 == MI->getNumOperands() ||
257 !MI->getOperand(OpNo+1).isReg())
259 ++OpNo; // Return the high-part.
262 // Write 'i' if an integer constant, otherwise nothing. Used to print
264 if (MI->getOperand(OpNo).isImm())
270 printOperand(MI, OpNo, O);
274 // At the moment, all inline asm memory operands are a single register.
275 // In any case, the output of this routine should always be just one
276 // assembler operand.
278 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
280 const char *ExtraCode,
282 if (ExtraCode && ExtraCode[0]) {
283 if (ExtraCode[1] != 0) return true; // Unknown modifier.
285 switch (ExtraCode[0]) {
286 default: return true; // Unknown modifier.
287 case 'y': // A memory reference for an X-form instruction
289 const char *RegName = "r0";
290 if (!Subtarget->isDarwin())
291 RegName = stripRegisterPrefix(RegName);
292 O << RegName << ", ";
293 printOperand(MI, OpNo, O);
296 case 'U': // Print 'u' for update form.
297 case 'X': // Print 'x' for indexed form.
299 // FIXME: Currently for PowerPC memory operands are always loaded
300 // into a register, so we never get an update or indexed form.
301 // This is bad even for offset forms, since even if we know we
302 // have a value in -16(r1), we will generate a load into r<n>
303 // and then load from 0(r<n>). Until that issue is fixed,
304 // tolerate 'U' and 'X' but don't output anything.
305 assert(MI->getOperand(OpNo).isReg());
311 assert(MI->getOperand(OpNo).isReg());
313 printOperand(MI, OpNo, O);
319 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
320 /// exists for it. If not, create one. Then return a symbol that references
322 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
323 const DataLayout *DL = TM.getDataLayout();
324 MCSymbol *&TOCEntry = TOC[Sym];
326 // To avoid name clash check if the name already exists.
328 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
329 "C" + Twine(TOCLabelID++)) == nullptr) {
330 TOCEntry = GetTempSymbol("C", TOCLabelID);
337 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
338 SM.serializeToStackMapSection();
341 void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
342 const MachineInstr &MI) {
343 unsigned NumNOPBytes = MI.getOperand(1).getImm();
345 SM.recordStackMap(MI);
346 assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
348 // Scan ahead to trim the shadow.
349 const MachineBasicBlock &MBB = *MI.getParent();
350 MachineBasicBlock::const_iterator MII(MI);
352 while (NumNOPBytes > 0) {
353 if (MII == MBB.end() || MII->isCall() ||
354 MII->getOpcode() == PPC::DBG_VALUE ||
355 MII->getOpcode() == TargetOpcode::PATCHPOINT ||
356 MII->getOpcode() == TargetOpcode::STACKMAP)
363 for (unsigned i = 0; i < NumNOPBytes; i += 4)
364 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
367 // Lower a patchpoint of the form:
368 // [<def>], <id>, <numBytes>, <target>, <numArgs>
369 void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
370 const MachineInstr &MI) {
371 SM.recordPatchPoint(MI);
372 PatchPointOpers Opers(&MI);
374 int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
375 unsigned EncodedBytes = 0;
377 assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
378 "High 16 bits of call target should be zero.");
379 unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
381 // Materialize the jump address:
382 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8)
384 .addImm((CallTarget >> 32) & 0xFFFF));
385 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC)
388 .addImm(32).addImm(16));
389 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8)
392 .addImm((CallTarget >> 16) & 0xFFFF));
393 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8)
396 .addImm(CallTarget & 0xFFFF));
398 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg));
399 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8));
403 unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
404 assert(NumBytes >= EncodedBytes &&
405 "Patchpoint can't request size less than the length of a call.");
406 assert((NumBytes - EncodedBytes) % 4 == 0 &&
407 "Invalid number of NOP bytes requested!");
408 for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
409 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
412 /// EmitTlsCall -- Given a GETtls[ld]ADDR[32] instruction, print a
413 /// call to __tls_get_addr to the current output stream.
414 void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
415 MCSymbolRefExpr::VariantKind VK) {
416 StringRef Name = "__tls_get_addr";
417 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
418 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
420 assert(MI->getOperand(0).isReg() &&
421 ((Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::X3) ||
422 (!Subtarget->isPPC64() && MI->getOperand(0).getReg() == PPC::R3)) &&
423 "GETtls[ld]ADDR[32] must define GPR3");
424 assert(MI->getOperand(1).isReg() &&
425 ((Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::X3) ||
426 (!Subtarget->isPPC64() && MI->getOperand(1).getReg() == PPC::R3)) &&
427 "GETtls[ld]ADDR[32] must read GPR3");
429 if (!Subtarget->isPPC64() && !Subtarget->isDarwin() &&
430 TM.getRelocationModel() == Reloc::PIC_)
431 Kind = MCSymbolRefExpr::VK_PLT;
432 const MCSymbolRefExpr *TlsRef =
433 MCSymbolRefExpr::Create(TlsGetAddr, Kind, OutContext);
434 const MachineOperand &MO = MI->getOperand(2);
435 const GlobalValue *GValue = MO.getGlobal();
436 MCSymbol *MOSymbol = getSymbol(GValue);
437 const MCExpr *SymVar = MCSymbolRefExpr::Create(MOSymbol, VK, OutContext);
438 EmitToStreamer(OutStreamer,
439 MCInstBuilder(Subtarget->isPPC64() ?
440 PPC::BL8_NOP_TLS : PPC::BL_TLS)
445 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
446 /// the current output stream.
448 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
450 bool isPPC64 = Subtarget->isPPC64();
451 bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
452 const Module *M = MF->getFunction()->getParent();
453 PICLevel::Level PL = M->getPICLevel();
455 // Lower multi-instruction pseudo operations.
456 switch (MI->getOpcode()) {
458 case TargetOpcode::DBG_VALUE:
459 llvm_unreachable("Should be handled target independently");
460 case TargetOpcode::STACKMAP:
461 return LowerSTACKMAP(OutStreamer, SM, *MI);
462 case TargetOpcode::PATCHPOINT:
463 return LowerPATCHPOINT(OutStreamer, SM, *MI);
465 case PPC::MoveGOTtoLR: {
466 // Transform %LR = MoveGOTtoLR
467 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
468 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
469 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
471 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
472 MCSymbol *GOTSymbol =
473 OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
474 const MCExpr *OffsExpr =
475 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol,
476 MCSymbolRefExpr::VK_PPC_LOCAL,
478 MCConstantExpr::Create(4, OutContext),
482 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
485 case PPC::MovePCtoLR:
486 case PPC::MovePCtoLR8: {
487 // Transform %LR = MovePCtoLR
488 // Into this, where the label is the PIC base:
491 MCSymbol *PICBase = MF->getPICBaseSymbol();
494 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
495 // FIXME: We would like an efficient form for this, so we don't have to do
496 // a lot of extra uniquing.
497 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
500 OutStreamer.EmitLabel(PICBase);
503 case PPC::UpdateGBR: {
504 // Transform %Rd = UpdateGBR(%Rt, %Ri)
505 // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
507 // Get the offset from the GOT Base Register to the GOT
508 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
509 MCSymbol *PICOffset =
510 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
511 TmpInst.setOpcode(PPC::LWZ);
513 MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
515 MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
516 MCSymbolRefExpr::VK_None,
518 const MCOperand TR = TmpInst.getOperand(1);
519 const MCOperand PICR = TmpInst.getOperand(0);
521 // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
522 TmpInst.getOperand(1) =
523 MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp, PB, OutContext));
524 TmpInst.getOperand(0) = TR;
525 TmpInst.getOperand(2) = PICR;
526 EmitToStreamer(OutStreamer, TmpInst);
528 TmpInst.setOpcode(PPC::ADD4);
529 TmpInst.getOperand(0) = PICR;
530 TmpInst.getOperand(1) = TR;
531 TmpInst.getOperand(2) = PICR;
532 EmitToStreamer(OutStreamer, TmpInst);
536 // Transform %R3 = LWZtoc <ga:@min1>, %R2
537 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
539 // Change the opcode to LWZ, and the global address operand to be a
540 // reference to the GOT entry we will synthesize later.
541 TmpInst.setOpcode(PPC::LWZ);
542 const MachineOperand &MO = MI->getOperand(1);
544 // Map symbol -> label of TOC entry
545 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
546 MCSymbol *MOSymbol = nullptr;
548 MOSymbol = getSymbol(MO.getGlobal());
550 MOSymbol = GetCPISymbol(MO.getIndex());
552 MOSymbol = GetJTISymbol(MO.getIndex());
553 else if (MO.isBlockAddress())
554 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
556 if (PL == PICLevel::Small) {
558 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_GOT,
560 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
562 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
565 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
568 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
570 Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
571 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
573 EmitToStreamer(OutStreamer, TmpInst);
580 // Transform %X3 = LDtoc <ga:@min1>, %X2
581 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
583 // Change the opcode to LD, and the global address operand to be a
584 // reference to the TOC entry we will synthesize later.
585 TmpInst.setOpcode(PPC::LD);
586 const MachineOperand &MO = MI->getOperand(1);
588 // Map symbol -> label of TOC entry
589 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
590 MCSymbol *MOSymbol = nullptr;
592 MOSymbol = getSymbol(MO.getGlobal());
594 MOSymbol = GetCPISymbol(MO.getIndex());
596 MOSymbol = GetJTISymbol(MO.getIndex());
597 else if (MO.isBlockAddress())
598 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
600 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
603 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
605 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
606 EmitToStreamer(OutStreamer, TmpInst);
610 case PPC::ADDIStocHA: {
611 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
612 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
614 // Change the opcode to ADDIS8. If the global address is external, has
615 // common linkage, is a non-local function address, or is a jump table
616 // address, then generate a TOC entry and reference that. Otherwise
617 // reference the symbol directly.
618 TmpInst.setOpcode(PPC::ADDIS8);
619 const MachineOperand &MO = MI->getOperand(2);
620 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
621 MO.isBlockAddress()) &&
622 "Invalid operand for ADDIStocHA!");
623 MCSymbol *MOSymbol = nullptr;
624 bool IsExternal = false;
625 bool IsNonLocalFunction = false;
626 bool IsCommon = false;
627 bool IsAvailExt = false;
630 const GlobalValue *GV = MO.getGlobal();
631 MOSymbol = getSymbol(GV);
632 IsExternal = GV->isDeclaration();
633 IsCommon = GV->hasCommonLinkage();
634 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
635 (GV->isDeclaration() || GV->isWeakForLinker());
636 IsAvailExt = GV->hasAvailableExternallyLinkage();
637 } else if (MO.isCPI())
638 MOSymbol = GetCPISymbol(MO.getIndex());
640 MOSymbol = GetJTISymbol(MO.getIndex());
641 else if (MO.isBlockAddress())
642 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
644 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
645 MO.isJTI() || MO.isBlockAddress() ||
646 TM.getCodeModel() == CodeModel::Large)
647 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
650 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
652 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
653 EmitToStreamer(OutStreamer, TmpInst);
657 // Transform %Xd = LDtocL <ga:@sym>, %Xs
658 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
660 // Change the opcode to LD. If the global address is external, has
661 // common linkage, or is a jump table address, then reference the
662 // associated TOC entry. Otherwise reference the symbol directly.
663 TmpInst.setOpcode(PPC::LD);
664 const MachineOperand &MO = MI->getOperand(1);
665 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
666 MO.isBlockAddress()) &&
667 "Invalid operand for LDtocL!");
668 MCSymbol *MOSymbol = nullptr;
671 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
672 else if (MO.isBlockAddress()) {
673 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
674 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
676 else if (MO.isCPI()) {
677 MOSymbol = GetCPISymbol(MO.getIndex());
678 if (TM.getCodeModel() == CodeModel::Large)
679 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
681 else if (MO.isGlobal()) {
682 const GlobalValue *GValue = MO.getGlobal();
683 MOSymbol = getSymbol(GValue);
684 if (GValue->getType()->getElementType()->isFunctionTy() ||
685 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
686 GValue->hasAvailableExternallyLinkage() ||
687 TM.getCodeModel() == CodeModel::Large)
688 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
692 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
694 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
695 EmitToStreamer(OutStreamer, TmpInst);
698 case PPC::ADDItocL: {
699 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
700 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
702 // Change the opcode to ADDI8. If the global address is external, then
703 // generate a TOC entry and reference that. Otherwise reference the
705 TmpInst.setOpcode(PPC::ADDI8);
706 const MachineOperand &MO = MI->getOperand(2);
707 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
708 MCSymbol *MOSymbol = nullptr;
709 bool IsExternal = false;
710 bool IsNonLocalFunction = false;
713 const GlobalValue *GV = MO.getGlobal();
714 MOSymbol = getSymbol(GV);
715 IsExternal = GV->isDeclaration();
716 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
717 (GV->isDeclaration() || GV->isWeakForLinker());
718 } else if (MO.isCPI())
719 MOSymbol = GetCPISymbol(MO.getIndex());
721 if (IsNonLocalFunction || IsExternal ||
722 TM.getCodeModel() == CodeModel::Large)
723 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
726 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
728 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
729 EmitToStreamer(OutStreamer, TmpInst);
732 case PPC::ADDISgotTprelHA: {
733 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
734 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
735 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
736 const MachineOperand &MO = MI->getOperand(2);
737 const GlobalValue *GValue = MO.getGlobal();
738 MCSymbol *MOSymbol = getSymbol(GValue);
739 const MCExpr *SymGotTprel =
740 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
742 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
743 .addReg(MI->getOperand(0).getReg())
744 .addReg(MI->getOperand(1).getReg())
745 .addExpr(SymGotTprel));
748 case PPC::LDgotTprelL:
749 case PPC::LDgotTprelL32: {
750 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
751 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
753 // Change the opcode to LD.
754 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
755 const MachineOperand &MO = MI->getOperand(1);
756 const GlobalValue *GValue = MO.getGlobal();
757 MCSymbol *MOSymbol = getSymbol(GValue);
759 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
761 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
762 EmitToStreamer(OutStreamer, TmpInst);
766 case PPC::PPC32PICGOT: {
767 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
768 MCSymbol *GOTRef = OutContext.CreateTempSymbol();
769 MCSymbol *NextInstr = OutContext.CreateTempSymbol();
771 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
772 // FIXME: We would like an efficient form for this, so we don't have to do
773 // a lot of extra uniquing.
774 .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
775 const MCExpr *OffsExpr =
776 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
777 MCSymbolRefExpr::Create(GOTRef, OutContext),
779 OutStreamer.EmitLabel(GOTRef);
780 OutStreamer.EmitValue(OffsExpr, 4);
781 OutStreamer.EmitLabel(NextInstr);
782 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
783 .addReg(MI->getOperand(0).getReg()));
784 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
785 .addReg(MI->getOperand(1).getReg())
787 .addReg(MI->getOperand(0).getReg()));
788 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
789 .addReg(MI->getOperand(0).getReg())
790 .addReg(MI->getOperand(1).getReg())
791 .addReg(MI->getOperand(0).getReg()));
794 case PPC::PPC32GOT: {
795 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
796 const MCExpr *SymGotTlsL =
797 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
799 const MCExpr *SymGotTlsHA =
800 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
802 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
803 .addReg(MI->getOperand(0).getReg())
804 .addExpr(SymGotTlsL));
805 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
806 .addReg(MI->getOperand(0).getReg())
807 .addReg(MI->getOperand(0).getReg())
808 .addExpr(SymGotTlsHA));
811 case PPC::ADDIStlsgdHA: {
812 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
813 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@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 *SymGotTlsGD =
819 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
821 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
822 .addReg(MI->getOperand(0).getReg())
823 .addReg(MI->getOperand(1).getReg())
824 .addExpr(SymGotTlsGD));
827 case PPC::ADDItlsgdL:
828 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
829 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
830 case PPC::ADDItlsgdL32: {
831 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
832 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
833 const MachineOperand &MO = MI->getOperand(2);
834 const GlobalValue *GValue = MO.getGlobal();
835 MCSymbol *MOSymbol = getSymbol(GValue);
836 const MCExpr *SymGotTlsGD = MCSymbolRefExpr::Create(
837 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO
838 : MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
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(SymGotTlsGD));
847 case PPC::GETtlsADDR:
848 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
849 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsgd)
850 case PPC::GETtlsADDR32: {
851 // Transform: %R3 = GETtlsADDR32 %R3, <ga:@sym>
852 // Into: BL_TLS __tls_get_addr(sym at tlsgd)@PLT
853 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSGD);
856 case PPC::ADDIStlsldHA: {
857 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
858 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
859 assert(Subtarget->isPPC64() && "Not supported for 32-bit PowerPC");
860 const MachineOperand &MO = MI->getOperand(2);
861 const GlobalValue *GValue = MO.getGlobal();
862 MCSymbol *MOSymbol = getSymbol(GValue);
863 const MCExpr *SymGotTlsLD =
864 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
866 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
867 .addReg(MI->getOperand(0).getReg())
868 .addReg(MI->getOperand(1).getReg())
869 .addExpr(SymGotTlsLD));
872 case PPC::ADDItlsldL:
873 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
874 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
875 case PPC::ADDItlsldL32: {
876 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
877 // Into: %Rd = ADDI %Rs, sym@got@tlsld
878 const MachineOperand &MO = MI->getOperand(2);
879 const GlobalValue *GValue = MO.getGlobal();
880 MCSymbol *MOSymbol = getSymbol(GValue);
881 const MCExpr *SymGotTlsLD = MCSymbolRefExpr::Create(
882 MOSymbol, Subtarget->isPPC64() ? MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO
883 : MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
885 EmitToStreamer(OutStreamer,
886 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
887 .addReg(MI->getOperand(0).getReg())
888 .addReg(MI->getOperand(1).getReg())
889 .addExpr(SymGotTlsLD));
892 case PPC::GETtlsldADDR:
893 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
894 // Into: BL8_NOP_TLS __tls_get_addr(sym at tlsld)
895 case PPC::GETtlsldADDR32: {
896 // Transform: %R3 = GETtlsldADDR32 %R3, <ga:@sym>
897 // Into: BL_TLS __tls_get_addr(sym at tlsld)@PLT
898 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSLD);
901 case PPC::ADDISdtprelHA:
902 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
903 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
904 case PPC::ADDISdtprelHA32: {
905 // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
906 // Into: %Rd = ADDIS %R3, sym@dtprel@ha
907 const MachineOperand &MO = MI->getOperand(2);
908 const GlobalValue *GValue = MO.getGlobal();
909 MCSymbol *MOSymbol = getSymbol(GValue);
910 const MCExpr *SymDtprel =
911 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
915 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
916 .addReg(MI->getOperand(0).getReg())
917 .addReg(Subtarget->isPPC64() ? PPC::X3 : PPC::R3)
918 .addExpr(SymDtprel));
921 case PPC::ADDIdtprelL:
922 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
923 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
924 case PPC::ADDIdtprelL32: {
925 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
926 // Into: %Rd = ADDI %Rs, sym@dtprel@l
927 const MachineOperand &MO = MI->getOperand(2);
928 const GlobalValue *GValue = MO.getGlobal();
929 MCSymbol *MOSymbol = getSymbol(GValue);
930 const MCExpr *SymDtprel =
931 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
933 EmitToStreamer(OutStreamer,
934 MCInstBuilder(Subtarget->isPPC64() ? PPC::ADDI8 : PPC::ADDI)
935 .addReg(MI->getOperand(0).getReg())
936 .addReg(MI->getOperand(1).getReg())
937 .addExpr(SymDtprel));
942 if (!Subtarget->hasMFOCRF()) {
943 // Transform: %R3 = MFOCRF %CR7
944 // Into: %R3 = MFCR ;; cr7
946 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
947 OutStreamer.AddComment(PPCInstPrinter::
948 getRegisterName(MI->getOperand(1).getReg()));
949 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
950 .addReg(MI->getOperand(0).getReg()));
956 if (!Subtarget->hasMFOCRF()) {
957 // Transform: %CR7 = MTOCRF %R3
958 // Into: MTCRF mask, %R3 ;; cr7
960 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
961 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
962 ->getEncodingValue(MI->getOperand(0).getReg());
963 OutStreamer.AddComment(PPCInstPrinter::
964 getRegisterName(MI->getOperand(0).getReg()));
965 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
967 .addReg(MI->getOperand(1).getReg()));
975 // Verify alignment is legal, so we don't create relocations
976 // that can't be supported.
977 // FIXME: This test is currently disabled for Darwin. The test
978 // suite shows a handful of test cases that fail this check for
979 // Darwin. Those need to be investigated before this sanity test
980 // can be enabled for those subtargets.
981 if (!Subtarget->isDarwin()) {
982 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
983 const MachineOperand &MO = MI->getOperand(OpNum);
984 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
985 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
987 // Now process the instruction normally.
992 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
993 EmitToStreamer(OutStreamer, TmpInst);
996 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
997 if (static_cast<const PPCTargetMachine &>(TM).isELFv2ABI()) {
998 PPCTargetStreamer *TS =
999 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1002 TS->emitAbiVersion(2);
1005 if (static_cast<const PPCTargetMachine &>(TM).isPPC64() ||
1006 TM.getRelocationModel() != Reloc::PIC_)
1007 return AsmPrinter::EmitStartOfAsmFile(M);
1009 if (M.getPICLevel() == PICLevel::Small)
1010 return AsmPrinter::EmitStartOfAsmFile(M);
1012 OutStreamer.SwitchSection(OutContext.getELFSection(
1013 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));
1015 MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".LTOC"));
1016 MCSymbol *CurrentPos = OutContext.CreateTempSymbol();
1018 OutStreamer.EmitLabel(CurrentPos);
1020 // The GOT pointer points to the middle of the GOT, in order to reference the
1021 // entire 64kB range. 0x8000 is the midpoint.
1022 const MCExpr *tocExpr =
1023 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
1024 MCConstantExpr::Create(0x8000, OutContext),
1027 OutStreamer.EmitAssignment(TOCSym, tocExpr);
1029 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1032 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
1033 // linux/ppc32 - Normal entry label.
1034 if (!Subtarget->isPPC64() &&
1035 (TM.getRelocationModel() != Reloc::PIC_ ||
1036 MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
1037 return AsmPrinter::EmitFunctionEntryLabel();
1039 if (!Subtarget->isPPC64()) {
1040 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
1041 if (PPCFI->usesPICBase()) {
1042 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
1043 MCSymbol *PICBase = MF->getPICBaseSymbol();
1044 OutStreamer.EmitLabel(RelocSymbol);
1046 const MCExpr *OffsExpr =
1047 MCBinaryExpr::CreateSub(
1048 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
1050 MCSymbolRefExpr::Create(PICBase, OutContext),
1052 OutStreamer.EmitValue(OffsExpr, 4);
1053 OutStreamer.EmitLabel(CurrentFnSym);
1056 return AsmPrinter::EmitFunctionEntryLabel();
1059 // ELFv2 ABI - Normal entry label.
1060 if (Subtarget->isELFv2ABI())
1061 return AsmPrinter::EmitFunctionEntryLabel();
1063 // Emit an official procedure descriptor.
1064 MCSectionSubPair Current = OutStreamer.getCurrentSection();
1065 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(
1066 ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1067 OutStreamer.SwitchSection(Section);
1068 OutStreamer.EmitLabel(CurrentFnSym);
1069 OutStreamer.EmitValueToAlignment(8);
1071 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
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);
1085 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
1086 ".L." + Twine(CurrentFnSym->getName()));
1087 OutStreamer.EmitLabel(RealFnSym);
1088 CurrentFnSymForSize = RealFnSym;
1092 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1093 const DataLayout *TD = TM.getDataLayout();
1095 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1097 PPCTargetStreamer &TS =
1098 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
1101 const MCSectionELF *Section;
1104 Section = OutStreamer.getContext().getELFSection(
1105 ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1107 Section = OutStreamer.getContext().getELFSection(
1108 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1109 OutStreamer.SwitchSection(Section);
1111 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
1112 E = TOC.end(); I != E; ++I) {
1113 OutStreamer.EmitLabel(I->second);
1114 MCSymbol *S = I->first;
1118 OutStreamer.EmitSymbolValue(S, 4);
1122 MachineModuleInfoELF &MMIELF =
1123 MMI->getObjFileInfo<MachineModuleInfoELF>();
1125 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1126 if (!Stubs.empty()) {
1127 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1128 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1130 OutStreamer.EmitLabel(Stubs[i].first);
1132 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
1134 isPPC64 ? 8 : 4/*size*/);
1138 OutStreamer.AddBlankLine();
1141 return AsmPrinter::doFinalization(M);
1144 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1145 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1146 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1147 // provide two entry points. The ABI guarantees that when calling the
1148 // local entry point, r2 is set up by the caller to contain the TOC base
1149 // for this function, and when calling the global entry point, r12 is set
1150 // up by the caller to hold the address of the global entry point. We
1151 // thus emit a prefix sequence along the following lines:
1154 // # global entry point
1155 // addis r2,r12,(.TOC.-func)@ha
1156 // addi r2,r2,(.TOC.-func)@l
1157 // .localentry func, .-func
1158 // # local entry point, followed by function body
1160 // This ensures we have r2 set up correctly while executing the function
1161 // body, no matter which entry point is called.
1162 if (Subtarget->isELFv2ABI()
1163 // Only do all that if the function uses r2 in the first place.
1164 && !MF->getRegInfo().use_empty(PPC::X2)) {
1166 MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol();
1167 OutStreamer.EmitLabel(GlobalEntryLabel);
1168 const MCSymbolRefExpr *GlobalEntryLabelExp =
1169 MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext);
1171 MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1172 const MCExpr *TOCDeltaExpr =
1173 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext),
1174 GlobalEntryLabelExp, OutContext);
1176 const MCExpr *TOCDeltaHi =
1177 PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext);
1178 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1181 .addExpr(TOCDeltaHi));
1183 const MCExpr *TOCDeltaLo =
1184 PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext);
1185 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI)
1188 .addExpr(TOCDeltaLo));
1190 MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol();
1191 OutStreamer.EmitLabel(LocalEntryLabel);
1192 const MCSymbolRefExpr *LocalEntryLabelExp =
1193 MCSymbolRefExpr::Create(LocalEntryLabel, OutContext);
1194 const MCExpr *LocalOffsetExp =
1195 MCBinaryExpr::CreateSub(LocalEntryLabelExp,
1196 GlobalEntryLabelExp, OutContext);
1198 PPCTargetStreamer *TS =
1199 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1202 TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp);
1206 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1209 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1210 // Only the 64-bit target requires a traceback table. For now,
1211 // we only emit the word of zeroes that GDB requires to find
1212 // the end of the function, and zeroes for the eight-byte
1213 // mandatory fields.
1214 // FIXME: We should fill in the eight-byte mandatory fields as described in
1215 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1216 // currently make use of these fields).
1217 if (Subtarget->isPPC64()) {
1218 OutStreamer.EmitIntValue(0, 4/*size*/);
1219 OutStreamer.EmitIntValue(0, 8/*size*/);
1223 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1224 static const char *const CPUDirectives[] = {
1248 // Get the numerically largest directive.
1249 // FIXME: How should we merge darwin directives?
1250 unsigned Directive = PPC::DIR_NONE;
1251 for (const Function &F : M) {
1252 const PPCSubtarget &STI = TM.getSubtarget<PPCSubtarget>(F);
1253 unsigned FDir = STI.getDarwinDirective();
1254 Directive = Directive > FDir ? FDir : STI.getDarwinDirective();
1255 if (STI.hasMFOCRF() && Directive < PPC::DIR_970)
1256 Directive = PPC::DIR_970;
1257 if (STI.hasAltivec() && Directive < PPC::DIR_7400)
1258 Directive = PPC::DIR_7400;
1259 if (STI.isPPC64() && Directive < PPC::DIR_64)
1260 Directive = PPC::DIR_64;
1263 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1265 assert(Directive < array_lengthof(CPUDirectives) &&
1266 "CPUDirectives[] might not be up-to-date!");
1267 PPCTargetStreamer &TStreamer =
1268 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1269 TStreamer.emitMachine(CPUDirectives[Directive]);
1271 // Prime text sections so they are adjacent. This reduces the likelihood a
1272 // large data or debug section causes a branch to exceed 16M limit.
1273 const TargetLoweringObjectFileMachO &TLOFMacho =
1274 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1275 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
1276 if (TM.getRelocationModel() == Reloc::PIC_) {
1277 OutStreamer.SwitchSection(
1278 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1279 MachO::S_SYMBOL_STUBS |
1280 MachO::S_ATTR_PURE_INSTRUCTIONS,
1281 32, SectionKind::getText()));
1282 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1283 OutStreamer.SwitchSection(
1284 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1285 MachO::S_SYMBOL_STUBS |
1286 MachO::S_ATTR_PURE_INSTRUCTIONS,
1287 16, SectionKind::getText()));
1289 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1292 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1293 // Remove $stub suffix, add $lazy_ptr.
1294 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1295 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
1298 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1299 // Add $tmp suffix to $stub, yielding $stub$tmp.
1300 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
1303 void PPCDarwinAsmPrinter::
1304 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1305 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1307 const TargetLoweringObjectFileMachO &TLOFMacho =
1308 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1310 // .lazy_symbol_pointer
1311 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1313 // Output stubs for dynamically-linked functions
1314 if (TM.getRelocationModel() == Reloc::PIC_) {
1315 const MCSection *StubSection =
1316 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1317 MachO::S_SYMBOL_STUBS |
1318 MachO::S_ATTR_PURE_INSTRUCTIONS,
1319 32, SectionKind::getText());
1320 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1321 OutStreamer.SwitchSection(StubSection);
1324 MCSymbol *Stub = Stubs[i].first;
1325 MCSymbol *RawSym = Stubs[i].second.getPointer();
1326 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1327 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1329 OutStreamer.EmitLabel(Stub);
1330 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1332 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
1333 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1335 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
1338 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1339 // bcl 20, 31, AnonSymbol
1340 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1341 OutStreamer.EmitLabel(AnonSymbol);
1343 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1344 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1345 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, true, OutContext);
1346 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1351 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1353 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1354 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1355 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, true, OutContext);
1356 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1358 .addExpr(SubLo16).addExpr(SubLo16)
1361 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1363 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1365 OutStreamer.SwitchSection(LSPSection);
1366 OutStreamer.EmitLabel(LazyPtr);
1367 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1369 MCSymbol *DyldStubBindingHelper =
1370 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1372 // .quad dyld_stub_binding_helper
1373 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1375 // .long dyld_stub_binding_helper
1376 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1379 OutStreamer.AddBlankLine();
1383 const MCSection *StubSection =
1384 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1385 MachO::S_SYMBOL_STUBS |
1386 MachO::S_ATTR_PURE_INSTRUCTIONS,
1387 16, SectionKind::getText());
1388 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1389 MCSymbol *Stub = Stubs[i].first;
1390 MCSymbol *RawSym = Stubs[i].second.getPointer();
1391 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1392 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1394 OutStreamer.SwitchSection(StubSection);
1396 OutStreamer.EmitLabel(Stub);
1397 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1399 // lis r11, ha16(LazyPtr)
1400 const MCExpr *LazyPtrHa16 =
1401 PPCMCExpr::CreateHa(LazyPtrExpr, true, OutContext);
1402 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
1404 .addExpr(LazyPtrHa16));
1406 // ldu r12, lo16(LazyPtr)(r11)
1407 // lwzu r12, lo16(LazyPtr)(r11)
1408 const MCExpr *LazyPtrLo16 =
1409 PPCMCExpr::CreateLo(LazyPtrExpr, true, OutContext);
1410 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1412 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1416 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1418 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1420 OutStreamer.SwitchSection(LSPSection);
1421 OutStreamer.EmitLabel(LazyPtr);
1422 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1424 MCSymbol *DyldStubBindingHelper =
1425 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1427 // .quad dyld_stub_binding_helper
1428 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1430 // .long dyld_stub_binding_helper
1431 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1435 OutStreamer.AddBlankLine();
1439 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1440 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1442 // Darwin/PPC always uses mach-o.
1443 const TargetLoweringObjectFileMachO &TLOFMacho =
1444 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1445 MachineModuleInfoMachO &MMIMacho =
1446 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1448 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1450 EmitFunctionStubs(Stubs);
1452 if (MAI->doesSupportExceptionHandling() && MMI) {
1453 // Add the (possibly multiple) personalities to the set of global values.
1454 // Only referenced functions get into the Personalities list.
1455 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1456 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1457 E = Personalities.end(); I != E; ++I) {
1459 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1460 MachineModuleInfoImpl::StubValueTy &StubSym =
1461 MMIMacho.getGVStubEntry(NLPSym);
1462 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1467 // Output stubs for dynamically-linked functions.
1468 Stubs = MMIMacho.GetGVStubList();
1470 // Output macho stubs for external and common global variables.
1471 if (!Stubs.empty()) {
1472 // Switch with ".non_lazy_symbol_pointer" directive.
1473 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1474 EmitAlignment(isPPC64 ? 3 : 2);
1476 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1478 OutStreamer.EmitLabel(Stubs[i].first);
1479 // .indirect_symbol _foo
1480 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1481 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1484 // External to current translation unit.
1485 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1487 // Internal to current translation unit.
1489 // When we place the LSDA into the TEXT section, the type info pointers
1490 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1491 // However, sometimes the types are local to the file. So we need to
1492 // fill in the value for the NLP in those cases.
1493 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1495 isPPC64 ? 8 : 4/*size*/);
1499 OutStreamer.AddBlankLine();
1502 Stubs = MMIMacho.GetHiddenGVStubList();
1503 if (!Stubs.empty()) {
1504 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1505 EmitAlignment(isPPC64 ? 3 : 2);
1507 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1509 OutStreamer.EmitLabel(Stubs[i].first);
1511 OutStreamer.EmitValue(MCSymbolRefExpr::
1512 Create(Stubs[i].second.getPointer(),
1514 isPPC64 ? 8 : 4/*size*/);
1518 OutStreamer.AddBlankLine();
1521 // Funny Darwin hack: This flag tells the linker that no global symbols
1522 // contain code that falls through to other global symbols (e.g. the obvious
1523 // implementation of multiple entry points). If this doesn't occur, the
1524 // linker can safely perform dead code stripping. Since LLVM never generates
1525 // code that does this, it is always safe to set.
1526 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1528 return AsmPrinter::doFinalization(M);
1531 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1532 /// for a MachineFunction to the given output stream, in a format that the
1533 /// Darwin assembler can deal with.
1536 createPPCAsmPrinterPass(TargetMachine &tm,
1537 std::unique_ptr<MCStreamer> &&Streamer) {
1538 if (Triple(tm.getTargetTriple()).isMacOSX())
1539 return new PPCDarwinAsmPrinter(tm, std::move(Streamer));
1540 return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
1543 // Force static initialization.
1544 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1545 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1546 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1547 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);