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), SM(*this) {
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);
104 void EmitTlsCall(const MachineInstr *MI, MCSymbolRefExpr::VariantKind VK);
107 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
108 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
110 explicit PPCLinuxAsmPrinter(TargetMachine &TM,
111 std::unique_ptr<MCStreamer> Streamer)
112 : PPCAsmPrinter(TM, std::move(Streamer)) {}
114 const char *getPassName() const override {
115 return "Linux PPC Assembly Printer";
118 bool doFinalization(Module &M) override;
119 void EmitStartOfAsmFile(Module &M) override;
121 void EmitFunctionEntryLabel() override;
123 void EmitFunctionBodyStart() override;
124 void EmitFunctionBodyEnd() override;
127 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
129 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
131 explicit PPCDarwinAsmPrinter(TargetMachine &TM,
132 std::unique_ptr<MCStreamer> Streamer)
133 : PPCAsmPrinter(TM, std::move(Streamer)) {}
135 const char *getPassName() const override {
136 return "Darwin PPC Assembly Printer";
139 bool doFinalization(Module &M) override;
140 void EmitStartOfAsmFile(Module &M) override;
142 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
144 } // end of anonymous namespace
146 /// stripRegisterPrefix - This method strips the character prefix from a
147 /// register name so that only the number is left. Used by for linux asm.
148 static const char *stripRegisterPrefix(const char *RegName) {
149 switch (RegName[0]) {
153 if (RegName[1] == 's')
156 case 'c': if (RegName[1] == 'r') return RegName + 2;
162 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
164 const DataLayout *DL = TM.getDataLayout();
165 const MachineOperand &MO = MI->getOperand(OpNo);
167 switch (MO.getType()) {
168 case MachineOperand::MO_Register: {
169 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
170 // Linux assembler (Others?) does not take register mnemonics.
171 // FIXME - What about special registers used in mfspr/mtspr?
172 if (!Subtarget.isDarwin()) 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()) RegName = stripRegisterPrefix(RegName);
288 O << RegName << ", ";
289 printOperand(MI, OpNo, O);
292 case 'U': // Print 'u' for update form.
293 case 'X': // Print 'x' for indexed form.
295 // FIXME: Currently for PowerPC memory operands are always loaded
296 // into a register, so we never get an update or indexed form.
297 // This is bad even for offset forms, since even if we know we
298 // have a value in -16(r1), we will generate a load into r<n>
299 // and then load from 0(r<n>). Until that issue is fixed,
300 // tolerate 'U' and 'X' but don't output anything.
301 assert(MI->getOperand(OpNo).isReg());
307 assert(MI->getOperand(OpNo).isReg());
309 printOperand(MI, OpNo, O);
315 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
316 /// exists for it. If not, create one. Then return a symbol that references
318 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
319 const DataLayout *DL = TM.getDataLayout();
320 MCSymbol *&TOCEntry = TOC[Sym];
322 // To avoid name clash check if the name already exists.
324 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
325 "C" + Twine(TOCLabelID++)) == nullptr) {
326 TOCEntry = GetTempSymbol("C", TOCLabelID);
333 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
334 SM.serializeToStackMapSection();
337 void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
338 const MachineInstr &MI) {
339 unsigned NumNOPBytes = MI.getOperand(1).getImm();
341 SM.recordStackMap(MI);
342 assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
344 // Scan ahead to trim the shadow.
345 const MachineBasicBlock &MBB = *MI.getParent();
346 MachineBasicBlock::const_iterator MII(MI);
348 while (NumNOPBytes > 0) {
349 if (MII == MBB.end() || MII->isCall() ||
350 MII->getOpcode() == PPC::DBG_VALUE ||
351 MII->getOpcode() == TargetOpcode::PATCHPOINT ||
352 MII->getOpcode() == TargetOpcode::STACKMAP)
359 for (unsigned i = 0; i < NumNOPBytes; i += 4)
360 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
363 // Lower a patchpoint of the form:
364 // [<def>], <id>, <numBytes>, <target>, <numArgs>
365 void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
366 const MachineInstr &MI) {
367 SM.recordPatchPoint(MI);
368 PatchPointOpers Opers(&MI);
370 int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
371 unsigned EncodedBytes = 0;
373 assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
374 "High 16 bits of call target should be zero.");
375 unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
377 // Materialize the jump address:
378 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8)
380 .addImm((CallTarget >> 32) & 0xFFFF));
381 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC)
384 .addImm(32).addImm(16));
385 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8)
388 .addImm((CallTarget >> 16) & 0xFFFF));
389 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8)
392 .addImm(CallTarget & 0xFFFF));
394 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg));
395 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8));
399 unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
400 assert(NumBytes >= EncodedBytes &&
401 "Patchpoint can't request size less than the length of a call.");
402 assert((NumBytes - EncodedBytes) % 4 == 0 &&
403 "Invalid number of NOP bytes requested!");
404 for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
405 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
408 /// EmitTlsCall -- Given a GETtls[ld]ADDR[32] instruction, print a
409 /// call to __tls_get_addr to the current output stream.
410 void PPCAsmPrinter::EmitTlsCall(const MachineInstr *MI,
411 MCSymbolRefExpr::VariantKind VK) {
412 StringRef Name = "__tls_get_addr";
413 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
414 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
416 assert(MI->getOperand(0).isReg() &&
417 ((Subtarget.isPPC64() && MI->getOperand(0).getReg() == PPC::X3) ||
418 (!Subtarget.isPPC64() && MI->getOperand(0).getReg() == PPC::R3)) &&
419 "GETtls[ld]ADDR[32] must define GPR3");
420 assert(MI->getOperand(1).isReg() &&
421 ((Subtarget.isPPC64() && MI->getOperand(1).getReg() == PPC::X3) ||
422 (!Subtarget.isPPC64() && MI->getOperand(1).getReg() == PPC::R3)) &&
423 "GETtls[ld]ADDR[32] must read GPR3");
425 if (!Subtarget.isPPC64() && !Subtarget.isDarwin() &&
426 TM.getRelocationModel() == Reloc::PIC_)
427 Kind = MCSymbolRefExpr::VK_PLT;
428 const MCSymbolRefExpr *TlsRef =
429 MCSymbolRefExpr::Create(TlsGetAddr, Kind, OutContext);
430 const MachineOperand &MO = MI->getOperand(2);
431 const GlobalValue *GValue = MO.getGlobal();
432 MCSymbol *MOSymbol = getSymbol(GValue);
433 const MCExpr *SymVar = MCSymbolRefExpr::Create(MOSymbol, VK, OutContext);
434 EmitToStreamer(OutStreamer,
435 MCInstBuilder(Subtarget.isPPC64() ?
436 PPC::BL8_NOP_TLS : PPC::BL_TLS)
441 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
442 /// the current output stream.
444 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
446 bool isPPC64 = Subtarget.isPPC64();
447 bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
448 const Module *M = MF->getFunction()->getParent();
449 PICLevel::Level PL = M->getPICLevel();
451 // Lower multi-instruction pseudo operations.
452 switch (MI->getOpcode()) {
454 case TargetOpcode::DBG_VALUE:
455 llvm_unreachable("Should be handled target independently");
456 case TargetOpcode::STACKMAP:
457 return LowerSTACKMAP(OutStreamer, SM, *MI);
458 case TargetOpcode::PATCHPOINT:
459 return LowerPATCHPOINT(OutStreamer, SM, *MI);
461 case PPC::MoveGOTtoLR: {
462 // Transform %LR = MoveGOTtoLR
463 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
464 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
465 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
467 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
468 MCSymbol *GOTSymbol =
469 OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
470 const MCExpr *OffsExpr =
471 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol,
472 MCSymbolRefExpr::VK_PPC_LOCAL,
474 MCConstantExpr::Create(4, OutContext),
478 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
481 case PPC::MovePCtoLR:
482 case PPC::MovePCtoLR8: {
483 // Transform %LR = MovePCtoLR
484 // Into this, where the label is the PIC base:
487 MCSymbol *PICBase = MF->getPICBaseSymbol();
490 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
491 // FIXME: We would like an efficient form for this, so we don't have to do
492 // a lot of extra uniquing.
493 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
496 OutStreamer.EmitLabel(PICBase);
499 case PPC::UpdateGBR: {
500 // Transform %Rd = UpdateGBR(%Rt, %Ri)
501 // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
503 // Get the offset from the GOT Base Register to the GOT
504 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
505 MCSymbol *PICOffset =
506 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
507 TmpInst.setOpcode(PPC::LWZ);
509 MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
511 MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
512 MCSymbolRefExpr::VK_None,
514 const MCOperand TR = TmpInst.getOperand(1);
515 const MCOperand PICR = TmpInst.getOperand(0);
517 // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
518 TmpInst.getOperand(1) =
519 MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp, PB, OutContext));
520 TmpInst.getOperand(0) = TR;
521 TmpInst.getOperand(2) = PICR;
522 EmitToStreamer(OutStreamer, TmpInst);
524 TmpInst.setOpcode(PPC::ADD4);
525 TmpInst.getOperand(0) = PICR;
526 TmpInst.getOperand(1) = TR;
527 TmpInst.getOperand(2) = PICR;
528 EmitToStreamer(OutStreamer, TmpInst);
532 // Transform %R3 = LWZtoc <ga:@min1>, %R2
533 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
535 // Change the opcode to LWZ, and the global address operand to be a
536 // reference to the GOT entry we will synthesize later.
537 TmpInst.setOpcode(PPC::LWZ);
538 const MachineOperand &MO = MI->getOperand(1);
540 // Map symbol -> label of TOC entry
541 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
542 MCSymbol *MOSymbol = nullptr;
544 MOSymbol = getSymbol(MO.getGlobal());
546 MOSymbol = GetCPISymbol(MO.getIndex());
548 MOSymbol = GetJTISymbol(MO.getIndex());
549 else if (MO.isBlockAddress())
550 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
552 if (PL == PICLevel::Small) {
554 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_GOT,
556 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
558 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
561 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
564 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
566 Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
567 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
569 EmitToStreamer(OutStreamer, TmpInst);
576 // Transform %X3 = LDtoc <ga:@min1>, %X2
577 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
579 // Change the opcode to LD, and the global address operand to be a
580 // reference to the TOC entry we will synthesize later.
581 TmpInst.setOpcode(PPC::LD);
582 const MachineOperand &MO = MI->getOperand(1);
584 // Map symbol -> label of TOC entry
585 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
586 MCSymbol *MOSymbol = nullptr;
588 MOSymbol = getSymbol(MO.getGlobal());
590 MOSymbol = GetCPISymbol(MO.getIndex());
592 MOSymbol = GetJTISymbol(MO.getIndex());
593 else if (MO.isBlockAddress())
594 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
596 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
599 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
601 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
602 EmitToStreamer(OutStreamer, TmpInst);
606 case PPC::ADDIStocHA: {
607 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
608 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
610 // Change the opcode to ADDIS8. If the global address is external, has
611 // common linkage, is a non-local function address, or is a jump table
612 // address, then generate a TOC entry and reference that. Otherwise
613 // reference the symbol directly.
614 TmpInst.setOpcode(PPC::ADDIS8);
615 const MachineOperand &MO = MI->getOperand(2);
616 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
617 MO.isBlockAddress()) &&
618 "Invalid operand for ADDIStocHA!");
619 MCSymbol *MOSymbol = nullptr;
620 bool IsExternal = false;
621 bool IsNonLocalFunction = false;
622 bool IsCommon = false;
623 bool IsAvailExt = false;
626 const GlobalValue *GV = MO.getGlobal();
627 MOSymbol = getSymbol(GV);
628 IsExternal = GV->isDeclaration();
629 IsCommon = GV->hasCommonLinkage();
630 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
631 (GV->isDeclaration() || GV->isWeakForLinker());
632 IsAvailExt = GV->hasAvailableExternallyLinkage();
633 } else if (MO.isCPI())
634 MOSymbol = GetCPISymbol(MO.getIndex());
636 MOSymbol = GetJTISymbol(MO.getIndex());
637 else if (MO.isBlockAddress())
638 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
640 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
641 MO.isJTI() || MO.isBlockAddress() ||
642 TM.getCodeModel() == CodeModel::Large)
643 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
646 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
648 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
649 EmitToStreamer(OutStreamer, TmpInst);
653 // Transform %Xd = LDtocL <ga:@sym>, %Xs
654 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
656 // Change the opcode to LD. If the global address is external, has
657 // common linkage, or is a jump table address, then reference the
658 // associated TOC entry. Otherwise reference the symbol directly.
659 TmpInst.setOpcode(PPC::LD);
660 const MachineOperand &MO = MI->getOperand(1);
661 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
662 MO.isBlockAddress()) &&
663 "Invalid operand for LDtocL!");
664 MCSymbol *MOSymbol = nullptr;
667 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
668 else if (MO.isBlockAddress()) {
669 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
670 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
672 else if (MO.isCPI()) {
673 MOSymbol = GetCPISymbol(MO.getIndex());
674 if (TM.getCodeModel() == CodeModel::Large)
675 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
677 else if (MO.isGlobal()) {
678 const GlobalValue *GValue = MO.getGlobal();
679 MOSymbol = getSymbol(GValue);
680 if (GValue->getType()->getElementType()->isFunctionTy() ||
681 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
682 GValue->hasAvailableExternallyLinkage() ||
683 TM.getCodeModel() == CodeModel::Large)
684 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
688 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
690 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
691 EmitToStreamer(OutStreamer, TmpInst);
694 case PPC::ADDItocL: {
695 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
696 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
698 // Change the opcode to ADDI8. If the global address is external, then
699 // generate a TOC entry and reference that. Otherwise reference the
701 TmpInst.setOpcode(PPC::ADDI8);
702 const MachineOperand &MO = MI->getOperand(2);
703 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
704 MCSymbol *MOSymbol = nullptr;
705 bool IsExternal = false;
706 bool IsNonLocalFunction = false;
709 const GlobalValue *GV = MO.getGlobal();
710 MOSymbol = getSymbol(GV);
711 IsExternal = GV->isDeclaration();
712 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
713 (GV->isDeclaration() || GV->isWeakForLinker());
714 } else if (MO.isCPI())
715 MOSymbol = GetCPISymbol(MO.getIndex());
717 if (IsNonLocalFunction || IsExternal ||
718 TM.getCodeModel() == CodeModel::Large)
719 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
722 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
724 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
725 EmitToStreamer(OutStreamer, TmpInst);
728 case PPC::ADDISgotTprelHA: {
729 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
730 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
731 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
732 const MachineOperand &MO = MI->getOperand(2);
733 const GlobalValue *GValue = MO.getGlobal();
734 MCSymbol *MOSymbol = getSymbol(GValue);
735 const MCExpr *SymGotTprel =
736 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
738 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
739 .addReg(MI->getOperand(0).getReg())
740 .addReg(MI->getOperand(1).getReg())
741 .addExpr(SymGotTprel));
744 case PPC::LDgotTprelL:
745 case PPC::LDgotTprelL32: {
746 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
747 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
749 // Change the opcode to LD.
750 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
751 const MachineOperand &MO = MI->getOperand(1);
752 const GlobalValue *GValue = MO.getGlobal();
753 MCSymbol *MOSymbol = getSymbol(GValue);
755 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
757 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
758 EmitToStreamer(OutStreamer, TmpInst);
762 case PPC::PPC32PICGOT: {
763 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
764 MCSymbol *GOTRef = OutContext.CreateTempSymbol();
765 MCSymbol *NextInstr = OutContext.CreateTempSymbol();
767 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
768 // FIXME: We would like an efficient form for this, so we don't have to do
769 // a lot of extra uniquing.
770 .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
771 const MCExpr *OffsExpr =
772 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
773 MCSymbolRefExpr::Create(GOTRef, OutContext),
775 OutStreamer.EmitLabel(GOTRef);
776 OutStreamer.EmitValue(OffsExpr, 4);
777 OutStreamer.EmitLabel(NextInstr);
778 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
779 .addReg(MI->getOperand(0).getReg()));
780 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
781 .addReg(MI->getOperand(1).getReg())
783 .addReg(MI->getOperand(0).getReg()));
784 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
785 .addReg(MI->getOperand(0).getReg())
786 .addReg(MI->getOperand(1).getReg())
787 .addReg(MI->getOperand(0).getReg()));
790 case PPC::PPC32GOT: {
791 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
792 const MCExpr *SymGotTlsL =
793 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
795 const MCExpr *SymGotTlsHA =
796 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
798 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
799 .addReg(MI->getOperand(0).getReg())
800 .addExpr(SymGotTlsL));
801 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
802 .addReg(MI->getOperand(0).getReg())
803 .addReg(MI->getOperand(0).getReg())
804 .addExpr(SymGotTlsHA));
807 case PPC::ADDIStlsgdHA: {
808 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
809 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
810 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
811 const MachineOperand &MO = MI->getOperand(2);
812 const GlobalValue *GValue = MO.getGlobal();
813 MCSymbol *MOSymbol = getSymbol(GValue);
814 const MCExpr *SymGotTlsGD =
815 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
817 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
818 .addReg(MI->getOperand(0).getReg())
819 .addReg(MI->getOperand(1).getReg())
820 .addExpr(SymGotTlsGD));
823 case PPC::ADDItlsgdL:
824 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
825 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
826 case PPC::ADDItlsgdL32: {
827 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
828 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
829 const MachineOperand &MO = MI->getOperand(2);
830 const GlobalValue *GValue = MO.getGlobal();
831 MCSymbol *MOSymbol = getSymbol(GValue);
832 const MCExpr *SymGotTlsGD =
833 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
834 MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO :
835 MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
837 EmitToStreamer(OutStreamer,
838 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
839 .addReg(MI->getOperand(0).getReg())
840 .addReg(MI->getOperand(1).getReg())
841 .addExpr(SymGotTlsGD));
844 case PPC::GETtlsADDR:
845 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
846 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsgd)
847 case PPC::GETtlsADDR32: {
848 // Transform: %R3 = GETtlsADDR32 %R3, <ga:@sym>
849 // Into: BL_TLS __tls_get_addr(sym@tlsgd)@PLT
850 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSGD);
853 case PPC::ADDIStlsldHA: {
854 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
855 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
856 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
857 const MachineOperand &MO = MI->getOperand(2);
858 const GlobalValue *GValue = MO.getGlobal();
859 MCSymbol *MOSymbol = getSymbol(GValue);
860 const MCExpr *SymGotTlsLD =
861 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
863 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
864 .addReg(MI->getOperand(0).getReg())
865 .addReg(MI->getOperand(1).getReg())
866 .addExpr(SymGotTlsLD));
869 case PPC::ADDItlsldL:
870 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
871 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
872 case PPC::ADDItlsldL32: {
873 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
874 // Into: %Rd = ADDI %Rs, sym@got@tlsld
875 const MachineOperand &MO = MI->getOperand(2);
876 const GlobalValue *GValue = MO.getGlobal();
877 MCSymbol *MOSymbol = getSymbol(GValue);
878 const MCExpr *SymGotTlsLD =
879 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
880 MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO :
881 MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
883 EmitToStreamer(OutStreamer,
884 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
885 .addReg(MI->getOperand(0).getReg())
886 .addReg(MI->getOperand(1).getReg())
887 .addExpr(SymGotTlsLD));
890 case PPC::GETtlsldADDR:
891 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
892 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsld)
893 case PPC::GETtlsldADDR32: {
894 // Transform: %R3 = GETtlsldADDR32 %R3, <ga:@sym>
895 // Into: BL_TLS __tls_get_addr(sym@tlsld)@PLT
896 EmitTlsCall(MI, MCSymbolRefExpr::VK_PPC_TLSLD);
899 case PPC::ADDISdtprelHA:
900 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
901 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
902 case PPC::ADDISdtprelHA32: {
903 // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
904 // Into: %Rd = ADDIS %R3, sym@dtprel@ha
905 const MachineOperand &MO = MI->getOperand(2);
906 const GlobalValue *GValue = MO.getGlobal();
907 MCSymbol *MOSymbol = getSymbol(GValue);
908 const MCExpr *SymDtprel =
909 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
911 EmitToStreamer(OutStreamer,
912 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
913 .addReg(MI->getOperand(0).getReg())
914 .addReg(Subtarget.isPPC64() ? PPC::X3 : PPC::R3)
915 .addExpr(SymDtprel));
918 case PPC::ADDIdtprelL:
919 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
920 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
921 case PPC::ADDIdtprelL32: {
922 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
923 // Into: %Rd = ADDI %Rs, sym@dtprel@l
924 const MachineOperand &MO = MI->getOperand(2);
925 const GlobalValue *GValue = MO.getGlobal();
926 MCSymbol *MOSymbol = getSymbol(GValue);
927 const MCExpr *SymDtprel =
928 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
930 EmitToStreamer(OutStreamer,
931 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
932 .addReg(MI->getOperand(0).getReg())
933 .addReg(MI->getOperand(1).getReg())
934 .addExpr(SymDtprel));
939 if (!Subtarget.hasMFOCRF()) {
940 // Transform: %R3 = MFOCRF %CR7
941 // Into: %R3 = MFCR ;; cr7
943 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
944 OutStreamer.AddComment(PPCInstPrinter::
945 getRegisterName(MI->getOperand(1).getReg()));
946 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
947 .addReg(MI->getOperand(0).getReg()));
953 if (!Subtarget.hasMFOCRF()) {
954 // Transform: %CR7 = MTOCRF %R3
955 // Into: MTCRF mask, %R3 ;; cr7
957 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
958 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
959 ->getEncodingValue(MI->getOperand(0).getReg());
960 OutStreamer.AddComment(PPCInstPrinter::
961 getRegisterName(MI->getOperand(0).getReg()));
962 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
964 .addReg(MI->getOperand(1).getReg()));
972 // Verify alignment is legal, so we don't create relocations
973 // that can't be supported.
974 // FIXME: This test is currently disabled for Darwin. The test
975 // suite shows a handful of test cases that fail this check for
976 // Darwin. Those need to be investigated before this sanity test
977 // can be enabled for those subtargets.
978 if (!Subtarget.isDarwin()) {
979 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
980 const MachineOperand &MO = MI->getOperand(OpNum);
981 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
982 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
984 // Now process the instruction normally.
989 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
990 EmitToStreamer(OutStreamer, TmpInst);
993 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
994 if (Subtarget.isELFv2ABI()) {
995 PPCTargetStreamer *TS =
996 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
999 TS->emitAbiVersion(2);
1002 if (Subtarget.isPPC64() || TM.getRelocationModel() != Reloc::PIC_)
1003 return AsmPrinter::EmitStartOfAsmFile(M);
1005 if (M.getPICLevel() == PICLevel::Small)
1006 return AsmPrinter::EmitStartOfAsmFile(M);
1008 OutStreamer.SwitchSection(OutContext.getELFSection(
1009 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));
1011 MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".LTOC"));
1012 MCSymbol *CurrentPos = OutContext.CreateTempSymbol();
1014 OutStreamer.EmitLabel(CurrentPos);
1016 // The GOT pointer points to the middle of the GOT, in order to reference the
1017 // entire 64kB range. 0x8000 is the midpoint.
1018 const MCExpr *tocExpr =
1019 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
1020 MCConstantExpr::Create(0x8000, OutContext),
1023 OutStreamer.EmitAssignment(TOCSym, tocExpr);
1025 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1028 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
1029 // linux/ppc32 - Normal entry label.
1030 if (!Subtarget.isPPC64() &&
1031 (TM.getRelocationModel() != Reloc::PIC_ ||
1032 MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
1033 return AsmPrinter::EmitFunctionEntryLabel();
1035 if (!Subtarget.isPPC64()) {
1036 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
1037 if (PPCFI->usesPICBase()) {
1038 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
1039 MCSymbol *PICBase = MF->getPICBaseSymbol();
1040 OutStreamer.EmitLabel(RelocSymbol);
1042 const MCExpr *OffsExpr =
1043 MCBinaryExpr::CreateSub(
1044 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
1046 MCSymbolRefExpr::Create(PICBase, OutContext),
1048 OutStreamer.EmitValue(OffsExpr, 4);
1049 OutStreamer.EmitLabel(CurrentFnSym);
1052 return AsmPrinter::EmitFunctionEntryLabel();
1055 // ELFv2 ABI - Normal entry label.
1056 if (Subtarget.isELFv2ABI())
1057 return AsmPrinter::EmitFunctionEntryLabel();
1059 // Emit an official procedure descriptor.
1060 MCSectionSubPair Current = OutStreamer.getCurrentSection();
1061 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(
1062 ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1063 OutStreamer.SwitchSection(Section);
1064 OutStreamer.EmitLabel(CurrentFnSym);
1065 OutStreamer.EmitValueToAlignment(8);
1067 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
1068 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
1070 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
1072 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1073 // Generates a R_PPC64_TOC relocation for TOC base insertion.
1074 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
1075 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
1077 // Emit a null environment pointer.
1078 OutStreamer.EmitIntValue(0, 8 /* size */);
1079 OutStreamer.SwitchSection(Current.first, Current.second);
1081 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
1082 ".L." + Twine(CurrentFnSym->getName()));
1083 OutStreamer.EmitLabel(RealFnSym);
1084 CurrentFnSymForSize = RealFnSym;
1088 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1089 const DataLayout *TD = TM.getDataLayout();
1091 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1093 PPCTargetStreamer &TS =
1094 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
1097 const MCSectionELF *Section;
1100 Section = OutStreamer.getContext().getELFSection(
1101 ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1103 Section = OutStreamer.getContext().getELFSection(
1104 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1105 OutStreamer.SwitchSection(Section);
1107 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
1108 E = TOC.end(); I != E; ++I) {
1109 OutStreamer.EmitLabel(I->second);
1110 MCSymbol *S = I->first;
1114 OutStreamer.EmitSymbolValue(S, 4);
1118 MachineModuleInfoELF &MMIELF =
1119 MMI->getObjFileInfo<MachineModuleInfoELF>();
1121 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1122 if (!Stubs.empty()) {
1123 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1124 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1126 OutStreamer.EmitLabel(Stubs[i].first);
1128 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
1130 isPPC64 ? 8 : 4/*size*/);
1134 OutStreamer.AddBlankLine();
1137 return AsmPrinter::doFinalization(M);
1140 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1141 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1142 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1143 // provide two entry points. The ABI guarantees that when calling the
1144 // local entry point, r2 is set up by the caller to contain the TOC base
1145 // for this function, and when calling the global entry point, r12 is set
1146 // up by the caller to hold the address of the global entry point. We
1147 // thus emit a prefix sequence along the following lines:
1150 // # global entry point
1151 // addis r2,r12,(.TOC.-func)@ha
1152 // addi r2,r2,(.TOC.-func)@l
1153 // .localentry func, .-func
1154 // # local entry point, followed by function body
1156 // This ensures we have r2 set up correctly while executing the function
1157 // body, no matter which entry point is called.
1158 if (Subtarget.isELFv2ABI()
1159 // Only do all that if the function uses r2 in the first place.
1160 && !MF->getRegInfo().use_empty(PPC::X2)) {
1162 MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol();
1163 OutStreamer.EmitLabel(GlobalEntryLabel);
1164 const MCSymbolRefExpr *GlobalEntryLabelExp =
1165 MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext);
1167 MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1168 const MCExpr *TOCDeltaExpr =
1169 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext),
1170 GlobalEntryLabelExp, OutContext);
1172 const MCExpr *TOCDeltaHi =
1173 PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext);
1174 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1177 .addExpr(TOCDeltaHi));
1179 const MCExpr *TOCDeltaLo =
1180 PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext);
1181 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI)
1184 .addExpr(TOCDeltaLo));
1186 MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol();
1187 OutStreamer.EmitLabel(LocalEntryLabel);
1188 const MCSymbolRefExpr *LocalEntryLabelExp =
1189 MCSymbolRefExpr::Create(LocalEntryLabel, OutContext);
1190 const MCExpr *LocalOffsetExp =
1191 MCBinaryExpr::CreateSub(LocalEntryLabelExp,
1192 GlobalEntryLabelExp, OutContext);
1194 PPCTargetStreamer *TS =
1195 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1198 TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp);
1202 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1205 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1206 // Only the 64-bit target requires a traceback table. For now,
1207 // we only emit the word of zeroes that GDB requires to find
1208 // the end of the function, and zeroes for the eight-byte
1209 // mandatory fields.
1210 // FIXME: We should fill in the eight-byte mandatory fields as described in
1211 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1212 // currently make use of these fields).
1213 if (Subtarget.isPPC64()) {
1214 OutStreamer.EmitIntValue(0, 4/*size*/);
1215 OutStreamer.EmitIntValue(0, 8/*size*/);
1219 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1220 static const char *const CPUDirectives[] = {
1244 unsigned Directive = Subtarget.getDarwinDirective();
1245 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
1246 Directive = PPC::DIR_970;
1247 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
1248 Directive = PPC::DIR_7400;
1249 if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
1250 Directive = PPC::DIR_64;
1251 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1253 assert(Directive < array_lengthof(CPUDirectives) &&
1254 "CPUDirectives[] might not be up-to-date!");
1255 PPCTargetStreamer &TStreamer =
1256 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1257 TStreamer.emitMachine(CPUDirectives[Directive]);
1259 // Prime text sections so they are adjacent. This reduces the likelihood a
1260 // large data or debug section causes a branch to exceed 16M limit.
1261 const TargetLoweringObjectFileMachO &TLOFMacho =
1262 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1263 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
1264 if (TM.getRelocationModel() == Reloc::PIC_) {
1265 OutStreamer.SwitchSection(
1266 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1267 MachO::S_SYMBOL_STUBS |
1268 MachO::S_ATTR_PURE_INSTRUCTIONS,
1269 32, SectionKind::getText()));
1270 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1271 OutStreamer.SwitchSection(
1272 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1273 MachO::S_SYMBOL_STUBS |
1274 MachO::S_ATTR_PURE_INSTRUCTIONS,
1275 16, SectionKind::getText()));
1277 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1280 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1281 // Remove $stub suffix, add $lazy_ptr.
1282 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1283 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
1286 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1287 // Add $tmp suffix to $stub, yielding $stub$tmp.
1288 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
1291 void PPCDarwinAsmPrinter::
1292 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1293 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1294 bool isDarwin = Subtarget.isDarwin();
1296 const TargetLoweringObjectFileMachO &TLOFMacho =
1297 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1299 // .lazy_symbol_pointer
1300 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1302 // Output stubs for dynamically-linked functions
1303 if (TM.getRelocationModel() == Reloc::PIC_) {
1304 const MCSection *StubSection =
1305 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1306 MachO::S_SYMBOL_STUBS |
1307 MachO::S_ATTR_PURE_INSTRUCTIONS,
1308 32, SectionKind::getText());
1309 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1310 OutStreamer.SwitchSection(StubSection);
1313 MCSymbol *Stub = Stubs[i].first;
1314 MCSymbol *RawSym = Stubs[i].second.getPointer();
1315 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1316 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1318 OutStreamer.EmitLabel(Stub);
1319 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1321 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
1322 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1324 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
1327 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1328 // bcl 20, 31, AnonSymbol
1329 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1330 OutStreamer.EmitLabel(AnonSymbol);
1332 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1333 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1334 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
1335 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1340 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1342 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1343 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1344 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
1345 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1347 .addExpr(SubLo16).addExpr(SubLo16)
1350 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1352 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1354 OutStreamer.SwitchSection(LSPSection);
1355 OutStreamer.EmitLabel(LazyPtr);
1356 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1358 MCSymbol *DyldStubBindingHelper =
1359 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1361 // .quad dyld_stub_binding_helper
1362 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1364 // .long dyld_stub_binding_helper
1365 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1368 OutStreamer.AddBlankLine();
1372 const MCSection *StubSection =
1373 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1374 MachO::S_SYMBOL_STUBS |
1375 MachO::S_ATTR_PURE_INSTRUCTIONS,
1376 16, SectionKind::getText());
1377 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1378 MCSymbol *Stub = Stubs[i].first;
1379 MCSymbol *RawSym = Stubs[i].second.getPointer();
1380 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1381 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1383 OutStreamer.SwitchSection(StubSection);
1385 OutStreamer.EmitLabel(Stub);
1386 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1388 // lis r11, ha16(LazyPtr)
1389 const MCExpr *LazyPtrHa16 =
1390 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
1391 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
1393 .addExpr(LazyPtrHa16));
1395 // ldu r12, lo16(LazyPtr)(r11)
1396 // lwzu r12, lo16(LazyPtr)(r11)
1397 const MCExpr *LazyPtrLo16 =
1398 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1399 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1401 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1405 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1407 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1409 OutStreamer.SwitchSection(LSPSection);
1410 OutStreamer.EmitLabel(LazyPtr);
1411 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1413 MCSymbol *DyldStubBindingHelper =
1414 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1416 // .quad dyld_stub_binding_helper
1417 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1419 // .long dyld_stub_binding_helper
1420 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1424 OutStreamer.AddBlankLine();
1428 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1429 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1431 // Darwin/PPC always uses mach-o.
1432 const TargetLoweringObjectFileMachO &TLOFMacho =
1433 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1434 MachineModuleInfoMachO &MMIMacho =
1435 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1437 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1439 EmitFunctionStubs(Stubs);
1441 if (MAI->doesSupportExceptionHandling() && MMI) {
1442 // Add the (possibly multiple) personalities to the set of global values.
1443 // Only referenced functions get into the Personalities list.
1444 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1445 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1446 E = Personalities.end(); I != E; ++I) {
1448 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1449 MachineModuleInfoImpl::StubValueTy &StubSym =
1450 MMIMacho.getGVStubEntry(NLPSym);
1451 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1456 // Output stubs for dynamically-linked functions.
1457 Stubs = MMIMacho.GetGVStubList();
1459 // Output macho stubs for external and common global variables.
1460 if (!Stubs.empty()) {
1461 // Switch with ".non_lazy_symbol_pointer" directive.
1462 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1463 EmitAlignment(isPPC64 ? 3 : 2);
1465 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1467 OutStreamer.EmitLabel(Stubs[i].first);
1468 // .indirect_symbol _foo
1469 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1470 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1473 // External to current translation unit.
1474 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1476 // Internal to current translation unit.
1478 // When we place the LSDA into the TEXT section, the type info pointers
1479 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1480 // However, sometimes the types are local to the file. So we need to
1481 // fill in the value for the NLP in those cases.
1482 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1484 isPPC64 ? 8 : 4/*size*/);
1488 OutStreamer.AddBlankLine();
1491 Stubs = MMIMacho.GetHiddenGVStubList();
1492 if (!Stubs.empty()) {
1493 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1494 EmitAlignment(isPPC64 ? 3 : 2);
1496 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1498 OutStreamer.EmitLabel(Stubs[i].first);
1500 OutStreamer.EmitValue(MCSymbolRefExpr::
1501 Create(Stubs[i].second.getPointer(),
1503 isPPC64 ? 8 : 4/*size*/);
1507 OutStreamer.AddBlankLine();
1510 // Funny Darwin hack: This flag tells the linker that no global symbols
1511 // contain code that falls through to other global symbols (e.g. the obvious
1512 // implementation of multiple entry points). If this doesn't occur, the
1513 // linker can safely perform dead code stripping. Since LLVM never generates
1514 // code that does this, it is always safe to set.
1515 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1517 return AsmPrinter::doFinalization(M);
1520 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1521 /// for a MachineFunction to the given output stream, in a format that the
1522 /// Darwin assembler can deal with.
1525 createPPCAsmPrinterPass(TargetMachine &tm,
1526 std::unique_ptr<MCStreamer> &&Streamer) {
1527 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1529 if (Subtarget->isDarwin())
1530 return new PPCDarwinAsmPrinter(tm, std::move(Streamer));
1531 return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
1534 // Force static initialization.
1535 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1536 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1537 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1538 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);