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);
106 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
107 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
109 explicit PPCLinuxAsmPrinter(TargetMachine &TM,
110 std::unique_ptr<MCStreamer> Streamer)
111 : PPCAsmPrinter(TM, std::move(Streamer)) {}
113 const char *getPassName() const override {
114 return "Linux PPC Assembly Printer";
117 bool doFinalization(Module &M) override;
118 void EmitStartOfAsmFile(Module &M) override;
120 void EmitFunctionEntryLabel() override;
122 void EmitFunctionBodyStart() override;
123 void EmitFunctionBodyEnd() override;
126 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
128 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
130 explicit PPCDarwinAsmPrinter(TargetMachine &TM,
131 std::unique_ptr<MCStreamer> Streamer)
132 : PPCAsmPrinter(TM, std::move(Streamer)) {}
134 const char *getPassName() const override {
135 return "Darwin PPC Assembly Printer";
138 bool doFinalization(Module &M) override;
139 void EmitStartOfAsmFile(Module &M) override;
141 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
143 } // end of anonymous namespace
145 /// stripRegisterPrefix - This method strips the character prefix from a
146 /// register name so that only the number is left. Used by for linux asm.
147 static const char *stripRegisterPrefix(const char *RegName) {
148 switch (RegName[0]) {
152 if (RegName[1] == 's')
155 case 'c': if (RegName[1] == 'r') return RegName + 2;
161 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
163 const DataLayout *DL = TM.getDataLayout();
164 const MachineOperand &MO = MI->getOperand(OpNo);
166 switch (MO.getType()) {
167 case MachineOperand::MO_Register: {
168 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
169 // Linux assembler (Others?) does not take register mnemonics.
170 // FIXME - What about special registers used in mfspr/mtspr?
171 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
175 case MachineOperand::MO_Immediate:
179 case MachineOperand::MO_MachineBasicBlock:
180 O << *MO.getMBB()->getSymbol();
182 case MachineOperand::MO_ConstantPoolIndex:
183 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
184 << '_' << MO.getIndex();
186 case MachineOperand::MO_BlockAddress:
187 O << *GetBlockAddressSymbol(MO.getBlockAddress());
189 case MachineOperand::MO_GlobalAddress: {
190 // Computing the address of a global symbol, not calling it.
191 const GlobalValue *GV = MO.getGlobal();
192 MCSymbol *SymToPrint;
194 // External or weakly linked global variables need non-lazily-resolved stubs
195 if (TM.getRelocationModel() != Reloc::Static &&
196 (GV->isDeclaration() || GV->isWeakForLinker())) {
197 if (!GV->hasHiddenVisibility()) {
198 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
199 MachineModuleInfoImpl::StubValueTy &StubSym =
200 MMI->getObjFileInfo<MachineModuleInfoMachO>()
201 .getGVStubEntry(SymToPrint);
202 if (!StubSym.getPointer())
203 StubSym = MachineModuleInfoImpl::
204 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
205 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
206 GV->hasAvailableExternallyLinkage()) {
207 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
209 MachineModuleInfoImpl::StubValueTy &StubSym =
210 MMI->getObjFileInfo<MachineModuleInfoMachO>().
211 getHiddenGVStubEntry(SymToPrint);
212 if (!StubSym.getPointer())
213 StubSym = MachineModuleInfoImpl::
214 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
216 SymToPrint = getSymbol(GV);
219 SymToPrint = getSymbol(GV);
224 printOffset(MO.getOffset(), O);
229 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
234 /// PrintAsmOperand - Print out an operand for an inline asm expression.
236 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
238 const char *ExtraCode, raw_ostream &O) {
239 // Does this asm operand have a single letter operand modifier?
240 if (ExtraCode && ExtraCode[0]) {
241 if (ExtraCode[1] != 0) return true; // Unknown modifier.
243 switch (ExtraCode[0]) {
245 // See if this is a generic print operand
246 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
247 case 'c': // Don't print "$" before a global var name or constant.
248 break; // PPC never has a prefix.
249 case 'L': // Write second word of DImode reference.
250 // Verify that this operand has two consecutive registers.
251 if (!MI->getOperand(OpNo).isReg() ||
252 OpNo+1 == MI->getNumOperands() ||
253 !MI->getOperand(OpNo+1).isReg())
255 ++OpNo; // Return the high-part.
258 // Write 'i' if an integer constant, otherwise nothing. Used to print
260 if (MI->getOperand(OpNo).isImm())
266 printOperand(MI, OpNo, O);
270 // At the moment, all inline asm memory operands are a single register.
271 // In any case, the output of this routine should always be just one
272 // assembler operand.
274 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
276 const char *ExtraCode,
278 if (ExtraCode && ExtraCode[0]) {
279 if (ExtraCode[1] != 0) return true; // Unknown modifier.
281 switch (ExtraCode[0]) {
282 default: return true; // Unknown modifier.
283 case 'y': // A memory reference for an X-form instruction
285 const char *RegName = "r0";
286 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
287 O << RegName << ", ";
288 printOperand(MI, OpNo, O);
291 case 'U': // Print 'u' for update form.
292 case 'X': // Print 'x' for indexed form.
294 // FIXME: Currently for PowerPC memory operands are always loaded
295 // into a register, so we never get an update or indexed form.
296 // This is bad even for offset forms, since even if we know we
297 // have a value in -16(r1), we will generate a load into r<n>
298 // and then load from 0(r<n>). Until that issue is fixed,
299 // tolerate 'U' and 'X' but don't output anything.
300 assert(MI->getOperand(OpNo).isReg());
306 assert(MI->getOperand(OpNo).isReg());
308 printOperand(MI, OpNo, O);
314 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
315 /// exists for it. If not, create one. Then return a symbol that references
317 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
318 const DataLayout *DL = TM.getDataLayout();
319 MCSymbol *&TOCEntry = TOC[Sym];
321 // To avoid name clash check if the name already exists.
323 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
324 "C" + Twine(TOCLabelID++)) == nullptr) {
325 TOCEntry = GetTempSymbol("C", TOCLabelID);
332 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
333 SM.serializeToStackMapSection();
336 void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
337 const MachineInstr &MI) {
338 unsigned NumNOPBytes = MI.getOperand(1).getImm();
340 SM.recordStackMap(MI);
341 assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
343 // Scan ahead to trim the shadow.
344 const MachineBasicBlock &MBB = *MI.getParent();
345 MachineBasicBlock::const_iterator MII(MI);
347 while (NumNOPBytes > 0) {
348 if (MII == MBB.end() || MII->isCall() ||
349 MII->getOpcode() == PPC::DBG_VALUE ||
350 MII->getOpcode() == TargetOpcode::PATCHPOINT ||
351 MII->getOpcode() == TargetOpcode::STACKMAP)
358 for (unsigned i = 0; i < NumNOPBytes; i += 4)
359 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
362 // Lower a patchpoint of the form:
363 // [<def>], <id>, <numBytes>, <target>, <numArgs>
364 void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
365 const MachineInstr &MI) {
366 SM.recordPatchPoint(MI);
367 PatchPointOpers Opers(&MI);
369 int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
370 unsigned EncodedBytes = 0;
372 assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
373 "High 16 bits of call target should be zero.");
374 unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
376 // Materialize the jump address:
377 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8)
379 .addImm((CallTarget >> 32) & 0xFFFF));
380 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC)
383 .addImm(32).addImm(16));
384 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8)
387 .addImm((CallTarget >> 16) & 0xFFFF));
388 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8)
391 .addImm(CallTarget & 0xFFFF));
393 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg));
394 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8));
398 unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
399 assert(NumBytes >= EncodedBytes &&
400 "Patchpoint can't request size less than the length of a call.");
401 assert((NumBytes - EncodedBytes) % 4 == 0 &&
402 "Invalid number of NOP bytes requested!");
403 for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
404 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
407 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
408 /// the current output stream.
410 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
412 bool isPPC64 = Subtarget.isPPC64();
413 bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
414 const Module *M = MF->getFunction()->getParent();
415 PICLevel::Level PL = M->getPICLevel();
417 // Lower multi-instruction pseudo operations.
418 switch (MI->getOpcode()) {
420 case TargetOpcode::DBG_VALUE:
421 llvm_unreachable("Should be handled target independently");
422 case TargetOpcode::STACKMAP:
423 return LowerSTACKMAP(OutStreamer, SM, *MI);
424 case TargetOpcode::PATCHPOINT:
425 return LowerPATCHPOINT(OutStreamer, SM, *MI);
427 case PPC::MoveGOTtoLR: {
428 // Transform %LR = MoveGOTtoLR
429 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
430 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
431 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
433 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
434 MCSymbol *GOTSymbol =
435 OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
436 const MCExpr *OffsExpr =
437 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol,
438 MCSymbolRefExpr::VK_PPC_LOCAL,
440 MCConstantExpr::Create(4, OutContext),
444 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
447 case PPC::MovePCtoLR:
448 case PPC::MovePCtoLR8: {
449 // Transform %LR = MovePCtoLR
450 // Into this, where the label is the PIC base:
453 MCSymbol *PICBase = MF->getPICBaseSymbol();
456 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
457 // FIXME: We would like an efficient form for this, so we don't have to do
458 // a lot of extra uniquing.
459 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
462 OutStreamer.EmitLabel(PICBase);
465 case PPC::UpdateGBR: {
466 // Transform %Rd = UpdateGBR(%Rt, %Ri)
467 // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
469 // Get the offset from the GOT Base Register to the GOT
470 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
471 MCSymbol *PICOffset =
472 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
473 TmpInst.setOpcode(PPC::LWZ);
475 MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
477 MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
478 MCSymbolRefExpr::VK_None,
480 const MCOperand TR = TmpInst.getOperand(1);
481 const MCOperand PICR = TmpInst.getOperand(0);
483 // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
484 TmpInst.getOperand(1) =
485 MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp, PB, OutContext));
486 TmpInst.getOperand(0) = TR;
487 TmpInst.getOperand(2) = PICR;
488 EmitToStreamer(OutStreamer, TmpInst);
490 TmpInst.setOpcode(PPC::ADD4);
491 TmpInst.getOperand(0) = PICR;
492 TmpInst.getOperand(1) = TR;
493 TmpInst.getOperand(2) = PICR;
494 EmitToStreamer(OutStreamer, TmpInst);
498 // Transform %R3 = LWZtoc <ga:@min1>, %R2
499 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
501 // Change the opcode to LWZ, and the global address operand to be a
502 // reference to the GOT entry we will synthesize later.
503 TmpInst.setOpcode(PPC::LWZ);
504 const MachineOperand &MO = MI->getOperand(1);
506 // Map symbol -> label of TOC entry
507 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
508 MCSymbol *MOSymbol = nullptr;
510 MOSymbol = getSymbol(MO.getGlobal());
512 MOSymbol = GetCPISymbol(MO.getIndex());
514 MOSymbol = GetJTISymbol(MO.getIndex());
515 else if (MO.isBlockAddress())
516 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
518 if (PL == PICLevel::Small) {
520 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_GOT,
522 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
524 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
527 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
530 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
532 Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
533 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
535 EmitToStreamer(OutStreamer, TmpInst);
542 // Transform %X3 = LDtoc <ga:@min1>, %X2
543 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
545 // Change the opcode to LD, and the global address operand to be a
546 // reference to the TOC entry we will synthesize later.
547 TmpInst.setOpcode(PPC::LD);
548 const MachineOperand &MO = MI->getOperand(1);
550 // Map symbol -> label of TOC entry
551 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
552 MCSymbol *MOSymbol = nullptr;
554 MOSymbol = getSymbol(MO.getGlobal());
556 MOSymbol = GetCPISymbol(MO.getIndex());
558 MOSymbol = GetJTISymbol(MO.getIndex());
559 else if (MO.isBlockAddress())
560 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
562 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
565 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
567 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
568 EmitToStreamer(OutStreamer, TmpInst);
572 case PPC::ADDIStocHA: {
573 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
574 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
576 // Change the opcode to ADDIS8. If the global address is external, has
577 // common linkage, is a non-local function address, or is a jump table
578 // address, then generate a TOC entry and reference that. Otherwise
579 // reference the symbol directly.
580 TmpInst.setOpcode(PPC::ADDIS8);
581 const MachineOperand &MO = MI->getOperand(2);
582 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
583 MO.isBlockAddress()) &&
584 "Invalid operand for ADDIStocHA!");
585 MCSymbol *MOSymbol = nullptr;
586 bool IsExternal = false;
587 bool IsNonLocalFunction = false;
588 bool IsCommon = false;
589 bool IsAvailExt = false;
592 const GlobalValue *GV = MO.getGlobal();
593 MOSymbol = getSymbol(GV);
594 IsExternal = GV->isDeclaration();
595 IsCommon = GV->hasCommonLinkage();
596 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
597 (GV->isDeclaration() || GV->isWeakForLinker());
598 IsAvailExt = GV->hasAvailableExternallyLinkage();
599 } else if (MO.isCPI())
600 MOSymbol = GetCPISymbol(MO.getIndex());
602 MOSymbol = GetJTISymbol(MO.getIndex());
603 else if (MO.isBlockAddress())
604 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
606 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
607 MO.isJTI() || MO.isBlockAddress() ||
608 TM.getCodeModel() == CodeModel::Large)
609 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
612 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
614 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
615 EmitToStreamer(OutStreamer, TmpInst);
619 // Transform %Xd = LDtocL <ga:@sym>, %Xs
620 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
622 // Change the opcode to LD. If the global address is external, has
623 // common linkage, or is a jump table address, then reference the
624 // associated TOC entry. Otherwise reference the symbol directly.
625 TmpInst.setOpcode(PPC::LD);
626 const MachineOperand &MO = MI->getOperand(1);
627 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
628 MO.isBlockAddress()) &&
629 "Invalid operand for LDtocL!");
630 MCSymbol *MOSymbol = nullptr;
633 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
634 else if (MO.isBlockAddress()) {
635 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
636 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
638 else if (MO.isCPI()) {
639 MOSymbol = GetCPISymbol(MO.getIndex());
640 if (TM.getCodeModel() == CodeModel::Large)
641 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
643 else if (MO.isGlobal()) {
644 const GlobalValue *GValue = MO.getGlobal();
645 MOSymbol = getSymbol(GValue);
646 if (GValue->getType()->getElementType()->isFunctionTy() ||
647 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
648 GValue->hasAvailableExternallyLinkage() ||
649 TM.getCodeModel() == CodeModel::Large)
650 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
654 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
656 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
657 EmitToStreamer(OutStreamer, TmpInst);
660 case PPC::ADDItocL: {
661 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
662 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
664 // Change the opcode to ADDI8. If the global address is external, then
665 // generate a TOC entry and reference that. Otherwise reference the
667 TmpInst.setOpcode(PPC::ADDI8);
668 const MachineOperand &MO = MI->getOperand(2);
669 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
670 MCSymbol *MOSymbol = nullptr;
671 bool IsExternal = false;
672 bool IsNonLocalFunction = false;
675 const GlobalValue *GV = MO.getGlobal();
676 MOSymbol = getSymbol(GV);
677 IsExternal = GV->isDeclaration();
678 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
679 (GV->isDeclaration() || GV->isWeakForLinker());
680 } else if (MO.isCPI())
681 MOSymbol = GetCPISymbol(MO.getIndex());
683 if (IsNonLocalFunction || IsExternal ||
684 TM.getCodeModel() == CodeModel::Large)
685 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
688 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
690 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
691 EmitToStreamer(OutStreamer, TmpInst);
694 case PPC::ADDISgotTprelHA: {
695 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
696 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
697 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
698 const MachineOperand &MO = MI->getOperand(2);
699 const GlobalValue *GValue = MO.getGlobal();
700 MCSymbol *MOSymbol = getSymbol(GValue);
701 const MCExpr *SymGotTprel =
702 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
704 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
705 .addReg(MI->getOperand(0).getReg())
706 .addReg(MI->getOperand(1).getReg())
707 .addExpr(SymGotTprel));
710 case PPC::LDgotTprelL:
711 case PPC::LDgotTprelL32: {
712 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
713 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
715 // Change the opcode to LD.
716 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
717 const MachineOperand &MO = MI->getOperand(1);
718 const GlobalValue *GValue = MO.getGlobal();
719 MCSymbol *MOSymbol = getSymbol(GValue);
721 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
723 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
724 EmitToStreamer(OutStreamer, TmpInst);
728 case PPC::PPC32PICGOT: {
729 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
730 MCSymbol *GOTRef = OutContext.CreateTempSymbol();
731 MCSymbol *NextInstr = OutContext.CreateTempSymbol();
733 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
734 // FIXME: We would like an efficient form for this, so we don't have to do
735 // a lot of extra uniquing.
736 .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
737 const MCExpr *OffsExpr =
738 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
739 MCSymbolRefExpr::Create(GOTRef, OutContext),
741 OutStreamer.EmitLabel(GOTRef);
742 OutStreamer.EmitValue(OffsExpr, 4);
743 OutStreamer.EmitLabel(NextInstr);
744 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
745 .addReg(MI->getOperand(0).getReg()));
746 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
747 .addReg(MI->getOperand(1).getReg())
749 .addReg(MI->getOperand(0).getReg()));
750 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
751 .addReg(MI->getOperand(0).getReg())
752 .addReg(MI->getOperand(1).getReg())
753 .addReg(MI->getOperand(0).getReg()));
756 case PPC::PPC32GOT: {
757 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
758 const MCExpr *SymGotTlsL =
759 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
761 const MCExpr *SymGotTlsHA =
762 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
764 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
765 .addReg(MI->getOperand(0).getReg())
766 .addExpr(SymGotTlsL));
767 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
768 .addReg(MI->getOperand(0).getReg())
769 .addReg(MI->getOperand(0).getReg())
770 .addExpr(SymGotTlsHA));
773 case PPC::ADDIStlsgdHA: {
774 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
775 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
776 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
777 const MachineOperand &MO = MI->getOperand(2);
778 const GlobalValue *GValue = MO.getGlobal();
779 MCSymbol *MOSymbol = getSymbol(GValue);
780 const MCExpr *SymGotTlsGD =
781 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
783 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
784 .addReg(MI->getOperand(0).getReg())
785 .addReg(MI->getOperand(1).getReg())
786 .addExpr(SymGotTlsGD));
789 case PPC::ADDItlsgdL:
790 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
791 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
792 case PPC::ADDItlsgdL32: {
793 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
794 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
795 const MachineOperand &MO = MI->getOperand(2);
796 const GlobalValue *GValue = MO.getGlobal();
797 MCSymbol *MOSymbol = getSymbol(GValue);
798 const MCExpr *SymGotTlsGD =
799 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
800 MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO :
801 MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
803 EmitToStreamer(OutStreamer,
804 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
805 .addReg(MI->getOperand(0).getReg())
806 .addReg(MI->getOperand(1).getReg())
807 .addExpr(SymGotTlsGD));
810 case PPC::ADDIStlsldHA: {
811 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
812 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
813 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
814 const MachineOperand &MO = MI->getOperand(2);
815 const GlobalValue *GValue = MO.getGlobal();
816 MCSymbol *MOSymbol = getSymbol(GValue);
817 const MCExpr *SymGotTlsLD =
818 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
820 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
821 .addReg(MI->getOperand(0).getReg())
822 .addReg(MI->getOperand(1).getReg())
823 .addExpr(SymGotTlsLD));
826 case PPC::ADDItlsldL:
827 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
828 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
829 case PPC::ADDItlsldL32: {
830 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
831 // Into: %Rd = ADDI %Rs, sym@got@tlsld
832 const MachineOperand &MO = MI->getOperand(2);
833 const GlobalValue *GValue = MO.getGlobal();
834 MCSymbol *MOSymbol = getSymbol(GValue);
835 const MCExpr *SymGotTlsLD =
836 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
837 MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO :
838 MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
840 EmitToStreamer(OutStreamer,
841 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
842 .addReg(MI->getOperand(0).getReg())
843 .addReg(MI->getOperand(1).getReg())
844 .addExpr(SymGotTlsLD));
847 case PPC::ADDISdtprelHA:
848 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
849 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
850 case PPC::ADDISdtprelHA32: {
851 // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
852 // Into: %Rd = ADDIS %R3, sym@dtprel@ha
853 const MachineOperand &MO = MI->getOperand(2);
854 const GlobalValue *GValue = MO.getGlobal();
855 MCSymbol *MOSymbol = getSymbol(GValue);
856 const MCExpr *SymDtprel =
857 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
859 EmitToStreamer(OutStreamer,
860 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
861 .addReg(MI->getOperand(0).getReg())
862 .addReg(Subtarget.isPPC64() ? PPC::X3 : PPC::R3)
863 .addExpr(SymDtprel));
866 case PPC::ADDIdtprelL:
867 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
868 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
869 case PPC::ADDIdtprelL32: {
870 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
871 // Into: %Rd = ADDI %Rs, sym@dtprel@l
872 const MachineOperand &MO = MI->getOperand(2);
873 const GlobalValue *GValue = MO.getGlobal();
874 MCSymbol *MOSymbol = getSymbol(GValue);
875 const MCExpr *SymDtprel =
876 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
878 EmitToStreamer(OutStreamer,
879 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
880 .addReg(MI->getOperand(0).getReg())
881 .addReg(MI->getOperand(1).getReg())
882 .addExpr(SymDtprel));
887 if (!Subtarget.hasMFOCRF()) {
888 // Transform: %R3 = MFOCRF %CR7
889 // Into: %R3 = MFCR ;; cr7
891 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
892 OutStreamer.AddComment(PPCInstPrinter::
893 getRegisterName(MI->getOperand(1).getReg()));
894 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
895 .addReg(MI->getOperand(0).getReg()));
901 if (!Subtarget.hasMFOCRF()) {
902 // Transform: %CR7 = MTOCRF %R3
903 // Into: MTCRF mask, %R3 ;; cr7
905 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
906 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
907 ->getEncodingValue(MI->getOperand(0).getReg());
908 OutStreamer.AddComment(PPCInstPrinter::
909 getRegisterName(MI->getOperand(0).getReg()));
910 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
912 .addReg(MI->getOperand(1).getReg()));
920 // Verify alignment is legal, so we don't create relocations
921 // that can't be supported.
922 // FIXME: This test is currently disabled for Darwin. The test
923 // suite shows a handful of test cases that fail this check for
924 // Darwin. Those need to be investigated before this sanity test
925 // can be enabled for those subtargets.
926 if (!Subtarget.isDarwin()) {
927 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
928 const MachineOperand &MO = MI->getOperand(OpNum);
929 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
930 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
932 // Now process the instruction normally.
937 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
938 EmitToStreamer(OutStreamer, TmpInst);
941 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
942 if (Subtarget.isELFv2ABI()) {
943 PPCTargetStreamer *TS =
944 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
947 TS->emitAbiVersion(2);
950 if (Subtarget.isPPC64() || TM.getRelocationModel() != Reloc::PIC_)
951 return AsmPrinter::EmitStartOfAsmFile(M);
953 if (M.getPICLevel() == PICLevel::Small)
954 return AsmPrinter::EmitStartOfAsmFile(M);
956 OutStreamer.SwitchSection(OutContext.getELFSection(
957 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC));
959 MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".LTOC"));
960 MCSymbol *CurrentPos = OutContext.CreateTempSymbol();
962 OutStreamer.EmitLabel(CurrentPos);
964 // The GOT pointer points to the middle of the GOT, in order to reference the
965 // entire 64kB range. 0x8000 is the midpoint.
966 const MCExpr *tocExpr =
967 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
968 MCConstantExpr::Create(0x8000, OutContext),
971 OutStreamer.EmitAssignment(TOCSym, tocExpr);
973 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
976 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
977 // linux/ppc32 - Normal entry label.
978 if (!Subtarget.isPPC64() &&
979 (TM.getRelocationModel() != Reloc::PIC_ ||
980 MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
981 return AsmPrinter::EmitFunctionEntryLabel();
983 if (!Subtarget.isPPC64()) {
984 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
985 if (PPCFI->usesPICBase()) {
986 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
987 MCSymbol *PICBase = MF->getPICBaseSymbol();
988 OutStreamer.EmitLabel(RelocSymbol);
990 const MCExpr *OffsExpr =
991 MCBinaryExpr::CreateSub(
992 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
994 MCSymbolRefExpr::Create(PICBase, OutContext),
996 OutStreamer.EmitValue(OffsExpr, 4);
997 OutStreamer.EmitLabel(CurrentFnSym);
1000 return AsmPrinter::EmitFunctionEntryLabel();
1003 // ELFv2 ABI - Normal entry label.
1004 if (Subtarget.isELFv2ABI())
1005 return AsmPrinter::EmitFunctionEntryLabel();
1007 // Emit an official procedure descriptor.
1008 MCSectionSubPair Current = OutStreamer.getCurrentSection();
1009 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(
1010 ".opd", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1011 OutStreamer.SwitchSection(Section);
1012 OutStreamer.EmitLabel(CurrentFnSym);
1013 OutStreamer.EmitValueToAlignment(8);
1015 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
1016 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
1018 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
1020 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1021 // Generates a R_PPC64_TOC relocation for TOC base insertion.
1022 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
1023 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
1025 // Emit a null environment pointer.
1026 OutStreamer.EmitIntValue(0, 8 /* size */);
1027 OutStreamer.SwitchSection(Current.first, Current.second);
1029 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
1030 ".L." + Twine(CurrentFnSym->getName()));
1031 OutStreamer.EmitLabel(RealFnSym);
1032 CurrentFnSymForSize = RealFnSym;
1036 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1037 const DataLayout *TD = TM.getDataLayout();
1039 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1041 PPCTargetStreamer &TS =
1042 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
1045 const MCSectionELF *Section;
1048 Section = OutStreamer.getContext().getELFSection(
1049 ".toc", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1051 Section = OutStreamer.getContext().getELFSection(
1052 ".got2", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
1053 OutStreamer.SwitchSection(Section);
1055 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
1056 E = TOC.end(); I != E; ++I) {
1057 OutStreamer.EmitLabel(I->second);
1058 MCSymbol *S = I->first;
1062 OutStreamer.EmitSymbolValue(S, 4);
1066 MachineModuleInfoELF &MMIELF =
1067 MMI->getObjFileInfo<MachineModuleInfoELF>();
1069 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1070 if (!Stubs.empty()) {
1071 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1072 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1074 OutStreamer.EmitLabel(Stubs[i].first);
1076 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
1078 isPPC64 ? 8 : 4/*size*/);
1082 OutStreamer.AddBlankLine();
1085 return AsmPrinter::doFinalization(M);
1088 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1089 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1090 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1091 // provide two entry points. The ABI guarantees that when calling the
1092 // local entry point, r2 is set up by the caller to contain the TOC base
1093 // for this function, and when calling the global entry point, r12 is set
1094 // up by the caller to hold the address of the global entry point. We
1095 // thus emit a prefix sequence along the following lines:
1098 // # global entry point
1099 // addis r2,r12,(.TOC.-func)@ha
1100 // addi r2,r2,(.TOC.-func)@l
1101 // .localentry func, .-func
1102 // # local entry point, followed by function body
1104 // This ensures we have r2 set up correctly while executing the function
1105 // body, no matter which entry point is called.
1106 if (Subtarget.isELFv2ABI()
1107 // Only do all that if the function uses r2 in the first place.
1108 && !MF->getRegInfo().use_empty(PPC::X2)) {
1110 MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol();
1111 OutStreamer.EmitLabel(GlobalEntryLabel);
1112 const MCSymbolRefExpr *GlobalEntryLabelExp =
1113 MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext);
1115 MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1116 const MCExpr *TOCDeltaExpr =
1117 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext),
1118 GlobalEntryLabelExp, OutContext);
1120 const MCExpr *TOCDeltaHi =
1121 PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext);
1122 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1125 .addExpr(TOCDeltaHi));
1127 const MCExpr *TOCDeltaLo =
1128 PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext);
1129 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI)
1132 .addExpr(TOCDeltaLo));
1134 MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol();
1135 OutStreamer.EmitLabel(LocalEntryLabel);
1136 const MCSymbolRefExpr *LocalEntryLabelExp =
1137 MCSymbolRefExpr::Create(LocalEntryLabel, OutContext);
1138 const MCExpr *LocalOffsetExp =
1139 MCBinaryExpr::CreateSub(LocalEntryLabelExp,
1140 GlobalEntryLabelExp, OutContext);
1142 PPCTargetStreamer *TS =
1143 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1146 TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp);
1150 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1153 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1154 // Only the 64-bit target requires a traceback table. For now,
1155 // we only emit the word of zeroes that GDB requires to find
1156 // the end of the function, and zeroes for the eight-byte
1157 // mandatory fields.
1158 // FIXME: We should fill in the eight-byte mandatory fields as described in
1159 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1160 // currently make use of these fields).
1161 if (Subtarget.isPPC64()) {
1162 OutStreamer.EmitIntValue(0, 4/*size*/);
1163 OutStreamer.EmitIntValue(0, 8/*size*/);
1167 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1168 static const char *const CPUDirectives[] = {
1192 unsigned Directive = Subtarget.getDarwinDirective();
1193 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
1194 Directive = PPC::DIR_970;
1195 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
1196 Directive = PPC::DIR_7400;
1197 if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
1198 Directive = PPC::DIR_64;
1199 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1201 assert(Directive < array_lengthof(CPUDirectives) &&
1202 "CPUDirectives[] might not be up-to-date!");
1203 PPCTargetStreamer &TStreamer =
1204 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1205 TStreamer.emitMachine(CPUDirectives[Directive]);
1207 // Prime text sections so they are adjacent. This reduces the likelihood a
1208 // large data or debug section causes a branch to exceed 16M limit.
1209 const TargetLoweringObjectFileMachO &TLOFMacho =
1210 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1211 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
1212 if (TM.getRelocationModel() == Reloc::PIC_) {
1213 OutStreamer.SwitchSection(
1214 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1215 MachO::S_SYMBOL_STUBS |
1216 MachO::S_ATTR_PURE_INSTRUCTIONS,
1217 32, SectionKind::getText()));
1218 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1219 OutStreamer.SwitchSection(
1220 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1221 MachO::S_SYMBOL_STUBS |
1222 MachO::S_ATTR_PURE_INSTRUCTIONS,
1223 16, SectionKind::getText()));
1225 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1228 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1229 // Remove $stub suffix, add $lazy_ptr.
1230 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1231 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
1234 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1235 // Add $tmp suffix to $stub, yielding $stub$tmp.
1236 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
1239 void PPCDarwinAsmPrinter::
1240 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1241 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1242 bool isDarwin = Subtarget.isDarwin();
1244 const TargetLoweringObjectFileMachO &TLOFMacho =
1245 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1247 // .lazy_symbol_pointer
1248 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1250 // Output stubs for dynamically-linked functions
1251 if (TM.getRelocationModel() == Reloc::PIC_) {
1252 const MCSection *StubSection =
1253 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1254 MachO::S_SYMBOL_STUBS |
1255 MachO::S_ATTR_PURE_INSTRUCTIONS,
1256 32, SectionKind::getText());
1257 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1258 OutStreamer.SwitchSection(StubSection);
1261 MCSymbol *Stub = Stubs[i].first;
1262 MCSymbol *RawSym = Stubs[i].second.getPointer();
1263 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1264 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1266 OutStreamer.EmitLabel(Stub);
1267 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1269 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
1270 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1272 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
1275 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1276 // bcl 20, 31, AnonSymbol
1277 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1278 OutStreamer.EmitLabel(AnonSymbol);
1280 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1281 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1282 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
1283 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1288 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1290 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1291 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1292 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
1293 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1295 .addExpr(SubLo16).addExpr(SubLo16)
1298 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1300 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1302 OutStreamer.SwitchSection(LSPSection);
1303 OutStreamer.EmitLabel(LazyPtr);
1304 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1306 MCSymbol *DyldStubBindingHelper =
1307 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1309 // .quad dyld_stub_binding_helper
1310 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1312 // .long dyld_stub_binding_helper
1313 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1316 OutStreamer.AddBlankLine();
1320 const MCSection *StubSection =
1321 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1322 MachO::S_SYMBOL_STUBS |
1323 MachO::S_ATTR_PURE_INSTRUCTIONS,
1324 16, SectionKind::getText());
1325 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1326 MCSymbol *Stub = Stubs[i].first;
1327 MCSymbol *RawSym = Stubs[i].second.getPointer();
1328 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1329 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1331 OutStreamer.SwitchSection(StubSection);
1333 OutStreamer.EmitLabel(Stub);
1334 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1336 // lis r11, ha16(LazyPtr)
1337 const MCExpr *LazyPtrHa16 =
1338 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
1339 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
1341 .addExpr(LazyPtrHa16));
1343 // ldu r12, lo16(LazyPtr)(r11)
1344 // lwzu r12, lo16(LazyPtr)(r11)
1345 const MCExpr *LazyPtrLo16 =
1346 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1347 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1349 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1353 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1355 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1357 OutStreamer.SwitchSection(LSPSection);
1358 OutStreamer.EmitLabel(LazyPtr);
1359 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1361 MCSymbol *DyldStubBindingHelper =
1362 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1364 // .quad dyld_stub_binding_helper
1365 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1367 // .long dyld_stub_binding_helper
1368 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1372 OutStreamer.AddBlankLine();
1376 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1377 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1379 // Darwin/PPC always uses mach-o.
1380 const TargetLoweringObjectFileMachO &TLOFMacho =
1381 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1382 MachineModuleInfoMachO &MMIMacho =
1383 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1385 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1387 EmitFunctionStubs(Stubs);
1389 if (MAI->doesSupportExceptionHandling() && MMI) {
1390 // Add the (possibly multiple) personalities to the set of global values.
1391 // Only referenced functions get into the Personalities list.
1392 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1393 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1394 E = Personalities.end(); I != E; ++I) {
1396 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1397 MachineModuleInfoImpl::StubValueTy &StubSym =
1398 MMIMacho.getGVStubEntry(NLPSym);
1399 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1404 // Output stubs for dynamically-linked functions.
1405 Stubs = MMIMacho.GetGVStubList();
1407 // Output macho stubs for external and common global variables.
1408 if (!Stubs.empty()) {
1409 // Switch with ".non_lazy_symbol_pointer" directive.
1410 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1411 EmitAlignment(isPPC64 ? 3 : 2);
1413 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1415 OutStreamer.EmitLabel(Stubs[i].first);
1416 // .indirect_symbol _foo
1417 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1418 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1421 // External to current translation unit.
1422 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1424 // Internal to current translation unit.
1426 // When we place the LSDA into the TEXT section, the type info pointers
1427 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1428 // However, sometimes the types are local to the file. So we need to
1429 // fill in the value for the NLP in those cases.
1430 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1432 isPPC64 ? 8 : 4/*size*/);
1436 OutStreamer.AddBlankLine();
1439 Stubs = MMIMacho.GetHiddenGVStubList();
1440 if (!Stubs.empty()) {
1441 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1442 EmitAlignment(isPPC64 ? 3 : 2);
1444 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1446 OutStreamer.EmitLabel(Stubs[i].first);
1448 OutStreamer.EmitValue(MCSymbolRefExpr::
1449 Create(Stubs[i].second.getPointer(),
1451 isPPC64 ? 8 : 4/*size*/);
1455 OutStreamer.AddBlankLine();
1458 // Funny Darwin hack: This flag tells the linker that no global symbols
1459 // contain code that falls through to other global symbols (e.g. the obvious
1460 // implementation of multiple entry points). If this doesn't occur, the
1461 // linker can safely perform dead code stripping. Since LLVM never generates
1462 // code that does this, it is always safe to set.
1463 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1465 return AsmPrinter::doFinalization(M);
1468 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1469 /// for a MachineFunction to the given output stream, in a format that the
1470 /// Darwin assembler can deal with.
1473 createPPCAsmPrinterPass(TargetMachine &tm,
1474 std::unique_ptr<MCStreamer> &&Streamer) {
1475 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1477 if (Subtarget->isDarwin())
1478 return new PPCDarwinAsmPrinter(tm, std::move(Streamer));
1479 return new PPCLinuxAsmPrinter(tm, std::move(Streamer));
1482 // Force static initialization.
1483 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1484 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1485 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1486 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);