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 "PPCMachineFunctionInfo.h"
22 #include "MCTargetDesc/PPCMCExpr.h"
23 #include "MCTargetDesc/PPCPredicates.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, MCStreamer &Streamer)
76 : AsmPrinter(TM, Streamer),
77 Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0), SM(*this) {}
79 const char *getPassName() const override {
80 return "PowerPC Assembly Printer";
83 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
85 void EmitInstruction(const MachineInstr *MI) override;
87 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
89 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
90 unsigned AsmVariant, const char *ExtraCode,
91 raw_ostream &O) override;
92 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
93 unsigned AsmVariant, const char *ExtraCode,
94 raw_ostream &O) override;
96 void EmitEndOfAsmFile(Module &M) override;
98 void LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
99 const MachineInstr &MI);
100 void LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
101 const MachineInstr &MI);
104 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
105 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
107 explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
108 : PPCAsmPrinter(TM, Streamer) {}
110 const char *getPassName() const override {
111 return "Linux PPC Assembly Printer";
114 bool doFinalization(Module &M) override;
115 void EmitStartOfAsmFile(Module &M) override;
117 void EmitFunctionEntryLabel() override;
119 void EmitFunctionBodyStart() override;
120 void EmitFunctionBodyEnd() override;
123 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
125 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
127 explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
128 : PPCAsmPrinter(TM, Streamer) {}
130 const char *getPassName() const override {
131 return "Darwin PPC Assembly Printer";
134 bool doFinalization(Module &M) override;
135 void EmitStartOfAsmFile(Module &M) override;
137 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
139 } // end of anonymous namespace
141 /// stripRegisterPrefix - This method strips the character prefix from a
142 /// register name so that only the number is left. Used by for linux asm.
143 static const char *stripRegisterPrefix(const char *RegName) {
144 switch (RegName[0]) {
148 if (RegName[1] == 's')
151 case 'c': if (RegName[1] == 'r') return RegName + 2;
157 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
159 const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout();
160 const MachineOperand &MO = MI->getOperand(OpNo);
162 switch (MO.getType()) {
163 case MachineOperand::MO_Register: {
164 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
165 // Linux assembler (Others?) does not take register mnemonics.
166 // FIXME - What about special registers used in mfspr/mtspr?
167 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
171 case MachineOperand::MO_Immediate:
175 case MachineOperand::MO_MachineBasicBlock:
176 O << *MO.getMBB()->getSymbol();
178 case MachineOperand::MO_ConstantPoolIndex:
179 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
180 << '_' << MO.getIndex();
182 case MachineOperand::MO_BlockAddress:
183 O << *GetBlockAddressSymbol(MO.getBlockAddress());
185 case MachineOperand::MO_GlobalAddress: {
186 // Computing the address of a global symbol, not calling it.
187 const GlobalValue *GV = MO.getGlobal();
188 MCSymbol *SymToPrint;
190 // External or weakly linked global variables need non-lazily-resolved stubs
191 if (TM.getRelocationModel() != Reloc::Static &&
192 (GV->isDeclaration() || GV->isWeakForLinker())) {
193 if (!GV->hasHiddenVisibility()) {
194 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
195 MachineModuleInfoImpl::StubValueTy &StubSym =
196 MMI->getObjFileInfo<MachineModuleInfoMachO>()
197 .getGVStubEntry(SymToPrint);
198 if (!StubSym.getPointer())
199 StubSym = MachineModuleInfoImpl::
200 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
201 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
202 GV->hasAvailableExternallyLinkage()) {
203 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
205 MachineModuleInfoImpl::StubValueTy &StubSym =
206 MMI->getObjFileInfo<MachineModuleInfoMachO>().
207 getHiddenGVStubEntry(SymToPrint);
208 if (!StubSym.getPointer())
209 StubSym = MachineModuleInfoImpl::
210 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
212 SymToPrint = getSymbol(GV);
215 SymToPrint = getSymbol(GV);
220 printOffset(MO.getOffset(), O);
225 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
230 /// PrintAsmOperand - Print out an operand for an inline asm expression.
232 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
234 const char *ExtraCode, raw_ostream &O) {
235 // Does this asm operand have a single letter operand modifier?
236 if (ExtraCode && ExtraCode[0]) {
237 if (ExtraCode[1] != 0) return true; // Unknown modifier.
239 switch (ExtraCode[0]) {
241 // See if this is a generic print operand
242 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
243 case 'c': // Don't print "$" before a global var name or constant.
244 break; // PPC never has a prefix.
245 case 'L': // Write second word of DImode reference.
246 // Verify that this operand has two consecutive registers.
247 if (!MI->getOperand(OpNo).isReg() ||
248 OpNo+1 == MI->getNumOperands() ||
249 !MI->getOperand(OpNo+1).isReg())
251 ++OpNo; // Return the high-part.
254 // Write 'i' if an integer constant, otherwise nothing. Used to print
256 if (MI->getOperand(OpNo).isImm())
262 printOperand(MI, OpNo, O);
266 // At the moment, all inline asm memory operands are a single register.
267 // In any case, the output of this routine should always be just one
268 // assembler operand.
270 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
272 const char *ExtraCode,
274 if (ExtraCode && ExtraCode[0]) {
275 if (ExtraCode[1] != 0) return true; // Unknown modifier.
277 switch (ExtraCode[0]) {
278 default: return true; // Unknown modifier.
279 case 'y': // A memory reference for an X-form instruction
281 const char *RegName = "r0";
282 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
283 O << RegName << ", ";
284 printOperand(MI, OpNo, O);
287 case 'U': // Print 'u' for update form.
288 case 'X': // Print 'x' for indexed form.
290 // FIXME: Currently for PowerPC memory operands are always loaded
291 // into a register, so we never get an update or indexed form.
292 // This is bad even for offset forms, since even if we know we
293 // have a value in -16(r1), we will generate a load into r<n>
294 // and then load from 0(r<n>). Until that issue is fixed,
295 // tolerate 'U' and 'X' but don't output anything.
296 assert(MI->getOperand(OpNo).isReg());
302 assert(MI->getOperand(OpNo).isReg());
304 printOperand(MI, OpNo, O);
310 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
311 /// exists for it. If not, create one. Then return a symbol that references
313 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
314 const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout();
315 MCSymbol *&TOCEntry = TOC[Sym];
317 // To avoid name clash check if the name already exists.
319 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
320 "C" + Twine(TOCLabelID++)) == nullptr) {
321 TOCEntry = GetTempSymbol("C", TOCLabelID);
328 void PPCAsmPrinter::EmitEndOfAsmFile(Module &M) {
329 SM.serializeToStackMapSection();
332 void PPCAsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
333 const MachineInstr &MI) {
334 unsigned NumNOPBytes = MI.getOperand(1).getImm();
336 SM.recordStackMap(MI);
337 assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
339 // Scan ahead to trim the shadow.
340 const MachineBasicBlock &MBB = *MI.getParent();
341 MachineBasicBlock::const_iterator MII(MI);
343 while (NumNOPBytes > 0) {
344 if (MII == MBB.end() || MII->isCall() ||
345 MII->getOpcode() == PPC::DBG_VALUE ||
346 MII->getOpcode() == TargetOpcode::PATCHPOINT ||
347 MII->getOpcode() == TargetOpcode::STACKMAP)
354 for (unsigned i = 0; i < NumNOPBytes; i += 4)
355 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
358 // Lower a patchpoint of the form:
359 // [<def>], <id>, <numBytes>, <target>, <numArgs>
360 void PPCAsmPrinter::LowerPATCHPOINT(MCStreamer &OutStreamer, StackMaps &SM,
361 const MachineInstr &MI) {
362 SM.recordPatchPoint(MI);
363 PatchPointOpers Opers(&MI);
365 int64_t CallTarget = Opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
366 unsigned EncodedBytes = 0;
368 assert((CallTarget & 0xFFFFFFFFFFFF) == CallTarget &&
369 "High 16 bits of call target should be zero.");
370 unsigned ScratchReg = MI.getOperand(Opers.getNextScratchIdx()).getReg();
372 // Materialize the jump address:
373 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI8)
375 .addImm((CallTarget >> 32) & 0xFFFF));
376 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::RLDIC)
379 .addImm(32).addImm(16));
380 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORIS8)
383 .addImm((CallTarget >> 16) & 0xFFFF));
384 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ORI8)
387 .addImm(CallTarget & 0xFFFF));
389 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR8).addReg(ScratchReg));
390 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTRL8));
394 unsigned NumBytes = Opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
395 assert(NumBytes >= EncodedBytes &&
396 "Patchpoint can't request size less than the length of a call.");
397 assert((NumBytes - EncodedBytes) % 4 == 0 &&
398 "Invalid number of NOP bytes requested!");
399 for (unsigned i = EncodedBytes; i < NumBytes; i += 4)
400 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::NOP));
403 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
404 /// the current output stream.
406 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
408 bool isPPC64 = Subtarget.isPPC64();
409 bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
410 const Module *M = MF->getFunction()->getParent();
411 PICLevel::Level PL = M->getPICLevel();
413 // Lower multi-instruction pseudo operations.
414 switch (MI->getOpcode()) {
416 case TargetOpcode::DBG_VALUE:
417 llvm_unreachable("Should be handled target independently");
418 case TargetOpcode::STACKMAP:
419 return LowerSTACKMAP(OutStreamer, SM, *MI);
420 case TargetOpcode::PATCHPOINT:
421 return LowerPATCHPOINT(OutStreamer, SM, *MI);
423 case PPC::MoveGOTtoLR: {
424 // Transform %LR = MoveGOTtoLR
425 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
426 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
427 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
429 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
430 MCSymbol *GOTSymbol =
431 OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
432 const MCExpr *OffsExpr =
433 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol,
434 MCSymbolRefExpr::VK_PPC_LOCAL,
436 MCConstantExpr::Create(4, OutContext),
440 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
443 case PPC::MovePCtoLR:
444 case PPC::MovePCtoLR8: {
445 // Transform %LR = MovePCtoLR
446 // Into this, where the label is the PIC base:
449 MCSymbol *PICBase = MF->getPICBaseSymbol();
452 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
453 // FIXME: We would like an efficient form for this, so we don't have to do
454 // a lot of extra uniquing.
455 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
458 OutStreamer.EmitLabel(PICBase);
461 case PPC::UpdateGBR: {
462 // Transform %Rd = UpdateGBR(%Rt, %Ri)
463 // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
465 // Get the offset from the GOT Base Register to the GOT
466 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
467 MCSymbol *PICOffset =
468 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
469 TmpInst.setOpcode(PPC::LWZ);
471 MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
473 MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
474 MCSymbolRefExpr::VK_None,
476 const MCOperand TR = TmpInst.getOperand(1);
477 const MCOperand PICR = TmpInst.getOperand(0);
479 // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
480 TmpInst.getOperand(1) =
481 MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp, PB, OutContext));
482 TmpInst.getOperand(0) = TR;
483 TmpInst.getOperand(2) = PICR;
484 EmitToStreamer(OutStreamer, TmpInst);
486 TmpInst.setOpcode(PPC::ADD4);
487 TmpInst.getOperand(0) = PICR;
488 TmpInst.getOperand(1) = TR;
489 TmpInst.getOperand(2) = PICR;
490 EmitToStreamer(OutStreamer, TmpInst);
494 // Transform %R3 = LWZtoc <ga:@min1>, %R2
495 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
497 // Change the opcode to LWZ, and the global address operand to be a
498 // reference to the GOT entry we will synthesize later.
499 TmpInst.setOpcode(PPC::LWZ);
500 const MachineOperand &MO = MI->getOperand(1);
502 // Map symbol -> label of TOC entry
503 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
504 MCSymbol *MOSymbol = nullptr;
506 MOSymbol = getSymbol(MO.getGlobal());
508 MOSymbol = GetCPISymbol(MO.getIndex());
510 MOSymbol = GetJTISymbol(MO.getIndex());
511 else if (MO.isBlockAddress())
512 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
514 if (PL == PICLevel::Small) {
516 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_GOT,
518 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
520 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
523 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
526 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
528 Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
529 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
531 EmitToStreamer(OutStreamer, TmpInst);
538 // Transform %X3 = LDtoc <ga:@min1>, %X2
539 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
541 // Change the opcode to LD, and the global address operand to be a
542 // reference to the TOC entry we will synthesize later.
543 TmpInst.setOpcode(PPC::LD);
544 const MachineOperand &MO = MI->getOperand(1);
546 // Map symbol -> label of TOC entry
547 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
548 MCSymbol *MOSymbol = nullptr;
550 MOSymbol = getSymbol(MO.getGlobal());
552 MOSymbol = GetCPISymbol(MO.getIndex());
554 MOSymbol = GetJTISymbol(MO.getIndex());
555 else if (MO.isBlockAddress())
556 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
558 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
561 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
563 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
564 EmitToStreamer(OutStreamer, TmpInst);
568 case PPC::ADDIStocHA: {
569 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
570 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
572 // Change the opcode to ADDIS8. If the global address is external, has
573 // common linkage, is a non-local function address, or is a jump table
574 // address, then generate a TOC entry and reference that. Otherwise
575 // reference the symbol directly.
576 TmpInst.setOpcode(PPC::ADDIS8);
577 const MachineOperand &MO = MI->getOperand(2);
578 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
579 MO.isBlockAddress()) &&
580 "Invalid operand for ADDIStocHA!");
581 MCSymbol *MOSymbol = nullptr;
582 bool IsExternal = false;
583 bool IsNonLocalFunction = false;
584 bool IsCommon = false;
585 bool IsAvailExt = false;
588 const GlobalValue *GV = MO.getGlobal();
589 MOSymbol = getSymbol(GV);
590 IsExternal = GV->isDeclaration();
591 IsCommon = GV->hasCommonLinkage();
592 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
593 (GV->isDeclaration() || GV->isWeakForLinker());
594 IsAvailExt = GV->hasAvailableExternallyLinkage();
595 } else if (MO.isCPI())
596 MOSymbol = GetCPISymbol(MO.getIndex());
598 MOSymbol = GetJTISymbol(MO.getIndex());
599 else if (MO.isBlockAddress())
600 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
602 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
603 MO.isJTI() || MO.isBlockAddress() ||
604 TM.getCodeModel() == CodeModel::Large)
605 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
608 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
610 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
611 EmitToStreamer(OutStreamer, TmpInst);
615 // Transform %Xd = LDtocL <ga:@sym>, %Xs
616 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
618 // Change the opcode to LD. If the global address is external, has
619 // common linkage, or is a jump table address, then reference the
620 // associated TOC entry. Otherwise reference the symbol directly.
621 TmpInst.setOpcode(PPC::LD);
622 const MachineOperand &MO = MI->getOperand(1);
623 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
624 MO.isBlockAddress()) &&
625 "Invalid operand for LDtocL!");
626 MCSymbol *MOSymbol = nullptr;
629 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
630 else if (MO.isBlockAddress()) {
631 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
632 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
634 else if (MO.isCPI()) {
635 MOSymbol = GetCPISymbol(MO.getIndex());
636 if (TM.getCodeModel() == CodeModel::Large)
637 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
639 else if (MO.isGlobal()) {
640 const GlobalValue *GValue = MO.getGlobal();
641 MOSymbol = getSymbol(GValue);
642 if (GValue->getType()->getElementType()->isFunctionTy() ||
643 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
644 GValue->hasAvailableExternallyLinkage() ||
645 TM.getCodeModel() == CodeModel::Large)
646 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
650 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
652 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
653 EmitToStreamer(OutStreamer, TmpInst);
656 case PPC::ADDItocL: {
657 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
658 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
660 // Change the opcode to ADDI8. If the global address is external, then
661 // generate a TOC entry and reference that. Otherwise reference the
663 TmpInst.setOpcode(PPC::ADDI8);
664 const MachineOperand &MO = MI->getOperand(2);
665 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
666 MCSymbol *MOSymbol = nullptr;
667 bool IsExternal = false;
668 bool IsNonLocalFunction = false;
671 const GlobalValue *GV = MO.getGlobal();
672 MOSymbol = getSymbol(GV);
673 IsExternal = GV->isDeclaration();
674 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
675 (GV->isDeclaration() || GV->isWeakForLinker());
676 } else if (MO.isCPI())
677 MOSymbol = GetCPISymbol(MO.getIndex());
679 if (IsNonLocalFunction || IsExternal ||
680 TM.getCodeModel() == CodeModel::Large)
681 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
684 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
686 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
687 EmitToStreamer(OutStreamer, TmpInst);
690 case PPC::ADDISgotTprelHA: {
691 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
692 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
693 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
694 const MachineOperand &MO = MI->getOperand(2);
695 const GlobalValue *GValue = MO.getGlobal();
696 MCSymbol *MOSymbol = getSymbol(GValue);
697 const MCExpr *SymGotTprel =
698 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
700 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
701 .addReg(MI->getOperand(0).getReg())
703 .addExpr(SymGotTprel));
706 case PPC::LDgotTprelL:
707 case PPC::LDgotTprelL32: {
708 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
709 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
711 // Change the opcode to LD.
712 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
713 const MachineOperand &MO = MI->getOperand(1);
714 const GlobalValue *GValue = MO.getGlobal();
715 MCSymbol *MOSymbol = getSymbol(GValue);
717 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
719 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
720 EmitToStreamer(OutStreamer, TmpInst);
724 case PPC::PPC32PICGOT: {
725 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
726 MCSymbol *GOTRef = OutContext.CreateTempSymbol();
727 MCSymbol *NextInstr = OutContext.CreateTempSymbol();
729 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
730 // FIXME: We would like an efficient form for this, so we don't have to do
731 // a lot of extra uniquing.
732 .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
733 const MCExpr *OffsExpr =
734 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
735 MCSymbolRefExpr::Create(GOTRef, OutContext),
737 OutStreamer.EmitLabel(GOTRef);
738 OutStreamer.EmitValue(OffsExpr, 4);
739 OutStreamer.EmitLabel(NextInstr);
740 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
741 .addReg(MI->getOperand(0).getReg()));
742 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
743 .addReg(MI->getOperand(1).getReg())
745 .addReg(MI->getOperand(0).getReg()));
746 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
747 .addReg(MI->getOperand(0).getReg())
748 .addReg(MI->getOperand(1).getReg())
749 .addReg(MI->getOperand(0).getReg()));
752 case PPC::PPC32GOT: {
753 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
754 const MCExpr *SymGotTlsL =
755 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
757 const MCExpr *SymGotTlsHA =
758 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
760 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
761 .addReg(MI->getOperand(0).getReg())
762 .addExpr(SymGotTlsL));
763 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
764 .addReg(MI->getOperand(0).getReg())
765 .addReg(MI->getOperand(0).getReg())
766 .addExpr(SymGotTlsHA));
769 case PPC::ADDIStlsgdHA: {
770 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
771 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
772 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
773 const MachineOperand &MO = MI->getOperand(2);
774 const GlobalValue *GValue = MO.getGlobal();
775 MCSymbol *MOSymbol = getSymbol(GValue);
776 const MCExpr *SymGotTlsGD =
777 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
779 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
780 .addReg(MI->getOperand(0).getReg())
782 .addExpr(SymGotTlsGD));
785 case PPC::ADDItlsgdL:
786 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
787 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
788 case PPC::ADDItlsgdL32: {
789 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
790 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
791 const MachineOperand &MO = MI->getOperand(2);
792 const GlobalValue *GValue = MO.getGlobal();
793 MCSymbol *MOSymbol = getSymbol(GValue);
794 const MCExpr *SymGotTlsGD =
795 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
796 MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO :
797 MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
799 EmitToStreamer(OutStreamer,
800 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
801 .addReg(MI->getOperand(0).getReg())
802 .addReg(MI->getOperand(1).getReg())
803 .addExpr(SymGotTlsGD));
806 case PPC::ADDIStlsldHA: {
807 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
808 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
809 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
810 const MachineOperand &MO = MI->getOperand(2);
811 const GlobalValue *GValue = MO.getGlobal();
812 MCSymbol *MOSymbol = getSymbol(GValue);
813 const MCExpr *SymGotTlsLD =
814 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
816 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
817 .addReg(MI->getOperand(0).getReg())
819 .addExpr(SymGotTlsLD));
822 case PPC::ADDItlsldL:
823 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
824 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
825 case PPC::ADDItlsldL32: {
826 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
827 // Into: %Rd = ADDI %Rs, sym@got@tlsld
828 const MachineOperand &MO = MI->getOperand(2);
829 const GlobalValue *GValue = MO.getGlobal();
830 MCSymbol *MOSymbol = getSymbol(GValue);
831 const MCExpr *SymGotTlsLD =
832 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
833 MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO :
834 MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
836 EmitToStreamer(OutStreamer,
837 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
838 .addReg(MI->getOperand(0).getReg())
839 .addReg(MI->getOperand(1).getReg())
840 .addExpr(SymGotTlsLD));
843 case PPC::ADDISdtprelHA:
844 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
845 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
846 case PPC::ADDISdtprelHA32: {
847 // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
848 // Into: %Rd = ADDIS %R3, sym@dtprel@ha
849 const MachineOperand &MO = MI->getOperand(2);
850 const GlobalValue *GValue = MO.getGlobal();
851 MCSymbol *MOSymbol = getSymbol(GValue);
852 const MCExpr *SymDtprel =
853 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
855 EmitToStreamer(OutStreamer,
856 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
857 .addReg(MI->getOperand(0).getReg())
858 .addReg(Subtarget.isPPC64() ? PPC::X3 : PPC::R3)
859 .addExpr(SymDtprel));
862 case PPC::ADDIdtprelL:
863 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
864 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
865 case PPC::ADDIdtprelL32: {
866 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
867 // Into: %Rd = ADDI %Rs, sym@dtprel@l
868 const MachineOperand &MO = MI->getOperand(2);
869 const GlobalValue *GValue = MO.getGlobal();
870 MCSymbol *MOSymbol = getSymbol(GValue);
871 const MCExpr *SymDtprel =
872 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
874 EmitToStreamer(OutStreamer,
875 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
876 .addReg(MI->getOperand(0).getReg())
877 .addReg(MI->getOperand(1).getReg())
878 .addExpr(SymDtprel));
883 if (!Subtarget.hasMFOCRF()) {
884 // Transform: %R3 = MFOCRF %CR7
885 // Into: %R3 = MFCR ;; cr7
887 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
888 OutStreamer.AddComment(PPCInstPrinter::
889 getRegisterName(MI->getOperand(1).getReg()));
890 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
891 .addReg(MI->getOperand(0).getReg()));
897 if (!Subtarget.hasMFOCRF()) {
898 // Transform: %CR7 = MTOCRF %R3
899 // Into: MTCRF mask, %R3 ;; cr7
901 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
902 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
903 ->getEncodingValue(MI->getOperand(0).getReg());
904 OutStreamer.AddComment(PPCInstPrinter::
905 getRegisterName(MI->getOperand(0).getReg()));
906 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
908 .addReg(MI->getOperand(1).getReg()));
916 // Verify alignment is legal, so we don't create relocations
917 // that can't be supported.
918 // FIXME: This test is currently disabled for Darwin. The test
919 // suite shows a handful of test cases that fail this check for
920 // Darwin. Those need to be investigated before this sanity test
921 // can be enabled for those subtargets.
922 if (!Subtarget.isDarwin()) {
923 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
924 const MachineOperand &MO = MI->getOperand(OpNum);
925 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
926 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
928 // Now process the instruction normally.
933 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
934 EmitToStreamer(OutStreamer, TmpInst);
937 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
938 if (Subtarget.isELFv2ABI()) {
939 PPCTargetStreamer *TS =
940 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
943 TS->emitAbiVersion(2);
946 if (Subtarget.isPPC64() || TM.getRelocationModel() != Reloc::PIC_)
947 return AsmPrinter::EmitStartOfAsmFile(M);
949 if (M.getPICLevel() == PICLevel::Small)
950 return AsmPrinter::EmitStartOfAsmFile(M);
952 OutStreamer.SwitchSection(OutContext.getELFSection(".got2",
953 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
954 SectionKind::getReadOnly()));
956 MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".LTOC"));
957 MCSymbol *CurrentPos = OutContext.CreateTempSymbol();
959 OutStreamer.EmitLabel(CurrentPos);
961 // The GOT pointer points to the middle of the GOT, in order to reference the
962 // entire 64kB range. 0x8000 is the midpoint.
963 const MCExpr *tocExpr =
964 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
965 MCConstantExpr::Create(0x8000, OutContext),
968 OutStreamer.EmitAssignment(TOCSym, tocExpr);
970 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
973 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
974 // linux/ppc32 - Normal entry label.
975 if (!Subtarget.isPPC64() &&
976 (TM.getRelocationModel() != Reloc::PIC_ ||
977 MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
978 return AsmPrinter::EmitFunctionEntryLabel();
980 if (!Subtarget.isPPC64()) {
981 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
982 if (PPCFI->usesPICBase()) {
983 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
984 MCSymbol *PICBase = MF->getPICBaseSymbol();
985 OutStreamer.EmitLabel(RelocSymbol);
987 const MCExpr *OffsExpr =
988 MCBinaryExpr::CreateSub(
989 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
991 MCSymbolRefExpr::Create(PICBase, OutContext),
993 OutStreamer.EmitValue(OffsExpr, 4);
994 OutStreamer.EmitLabel(CurrentFnSym);
997 return AsmPrinter::EmitFunctionEntryLabel();
1000 // ELFv2 ABI - Normal entry label.
1001 if (Subtarget.isELFv2ABI())
1002 return AsmPrinter::EmitFunctionEntryLabel();
1004 // Emit an official procedure descriptor.
1005 MCSectionSubPair Current = OutStreamer.getCurrentSection();
1006 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
1007 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
1008 SectionKind::getReadOnly());
1009 OutStreamer.SwitchSection(Section);
1010 OutStreamer.EmitLabel(CurrentFnSym);
1011 OutStreamer.EmitValueToAlignment(8);
1013 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
1014 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
1016 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
1018 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1019 // Generates a R_PPC64_TOC relocation for TOC base insertion.
1020 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
1021 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
1023 // Emit a null environment pointer.
1024 OutStreamer.EmitIntValue(0, 8 /* size */);
1025 OutStreamer.SwitchSection(Current.first, Current.second);
1027 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
1028 ".L." + Twine(CurrentFnSym->getName()));
1029 OutStreamer.EmitLabel(RealFnSym);
1030 CurrentFnSymForSize = RealFnSym;
1034 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
1035 const DataLayout *TD = TM.getSubtargetImpl()->getDataLayout();
1037 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1039 PPCTargetStreamer &TS =
1040 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
1043 const MCSectionELF *Section;
1046 Section = OutStreamer.getContext().getELFSection(".toc",
1047 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
1048 SectionKind::getReadOnly());
1050 Section = OutStreamer.getContext().getELFSection(".got2",
1051 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
1052 SectionKind::getReadOnly());
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) {
1242 TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64;
1243 bool isDarwin = Subtarget.isDarwin();
1245 const TargetLoweringObjectFileMachO &TLOFMacho =
1246 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1248 // .lazy_symbol_pointer
1249 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1251 // Output stubs for dynamically-linked functions
1252 if (TM.getRelocationModel() == Reloc::PIC_) {
1253 const MCSection *StubSection =
1254 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1255 MachO::S_SYMBOL_STUBS |
1256 MachO::S_ATTR_PURE_INSTRUCTIONS,
1257 32, SectionKind::getText());
1258 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1259 OutStreamer.SwitchSection(StubSection);
1262 MCSymbol *Stub = Stubs[i].first;
1263 MCSymbol *RawSym = Stubs[i].second.getPointer();
1264 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1265 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1267 OutStreamer.EmitLabel(Stub);
1268 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1270 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
1271 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1273 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
1276 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1277 // bcl 20, 31, AnonSymbol
1278 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1279 OutStreamer.EmitLabel(AnonSymbol);
1281 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1282 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1283 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
1284 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1289 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1291 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1292 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1293 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
1294 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1296 .addExpr(SubLo16).addExpr(SubLo16)
1299 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1301 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1303 OutStreamer.SwitchSection(LSPSection);
1304 OutStreamer.EmitLabel(LazyPtr);
1305 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1307 MCSymbol *DyldStubBindingHelper =
1308 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1310 // .quad dyld_stub_binding_helper
1311 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1313 // .long dyld_stub_binding_helper
1314 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1317 OutStreamer.AddBlankLine();
1321 const MCSection *StubSection =
1322 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1323 MachO::S_SYMBOL_STUBS |
1324 MachO::S_ATTR_PURE_INSTRUCTIONS,
1325 16, SectionKind::getText());
1326 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1327 MCSymbol *Stub = Stubs[i].first;
1328 MCSymbol *RawSym = Stubs[i].second.getPointer();
1329 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1330 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1332 OutStreamer.SwitchSection(StubSection);
1334 OutStreamer.EmitLabel(Stub);
1335 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1337 // lis r11, ha16(LazyPtr)
1338 const MCExpr *LazyPtrHa16 =
1339 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
1340 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
1342 .addExpr(LazyPtrHa16));
1344 // ldu r12, lo16(LazyPtr)(r11)
1345 // lwzu r12, lo16(LazyPtr)(r11)
1346 const MCExpr *LazyPtrLo16 =
1347 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1348 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1350 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1354 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1356 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1358 OutStreamer.SwitchSection(LSPSection);
1359 OutStreamer.EmitLabel(LazyPtr);
1360 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1362 MCSymbol *DyldStubBindingHelper =
1363 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1365 // .quad dyld_stub_binding_helper
1366 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1368 // .long dyld_stub_binding_helper
1369 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1373 OutStreamer.AddBlankLine();
1377 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1379 TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64;
1381 // Darwin/PPC always uses mach-o.
1382 const TargetLoweringObjectFileMachO &TLOFMacho =
1383 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1384 MachineModuleInfoMachO &MMIMacho =
1385 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1387 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1389 EmitFunctionStubs(Stubs);
1391 if (MAI->doesSupportExceptionHandling() && MMI) {
1392 // Add the (possibly multiple) personalities to the set of global values.
1393 // Only referenced functions get into the Personalities list.
1394 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1395 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1396 E = Personalities.end(); I != E; ++I) {
1398 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1399 MachineModuleInfoImpl::StubValueTy &StubSym =
1400 MMIMacho.getGVStubEntry(NLPSym);
1401 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1406 // Output stubs for dynamically-linked functions.
1407 Stubs = MMIMacho.GetGVStubList();
1409 // Output macho stubs for external and common global variables.
1410 if (!Stubs.empty()) {
1411 // Switch with ".non_lazy_symbol_pointer" directive.
1412 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1413 EmitAlignment(isPPC64 ? 3 : 2);
1415 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1417 OutStreamer.EmitLabel(Stubs[i].first);
1418 // .indirect_symbol _foo
1419 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1420 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1423 // External to current translation unit.
1424 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1426 // Internal to current translation unit.
1428 // When we place the LSDA into the TEXT section, the type info pointers
1429 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1430 // However, sometimes the types are local to the file. So we need to
1431 // fill in the value for the NLP in those cases.
1432 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1434 isPPC64 ? 8 : 4/*size*/);
1438 OutStreamer.AddBlankLine();
1441 Stubs = MMIMacho.GetHiddenGVStubList();
1442 if (!Stubs.empty()) {
1443 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1444 EmitAlignment(isPPC64 ? 3 : 2);
1446 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1448 OutStreamer.EmitLabel(Stubs[i].first);
1450 OutStreamer.EmitValue(MCSymbolRefExpr::
1451 Create(Stubs[i].second.getPointer(),
1453 isPPC64 ? 8 : 4/*size*/);
1457 OutStreamer.AddBlankLine();
1460 // Funny Darwin hack: This flag tells the linker that no global symbols
1461 // contain code that falls through to other global symbols (e.g. the obvious
1462 // implementation of multiple entry points). If this doesn't occur, the
1463 // linker can safely perform dead code stripping. Since LLVM never generates
1464 // code that does this, it is always safe to set.
1465 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1467 return AsmPrinter::doFinalization(M);
1470 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1471 /// for a MachineFunction to the given output stream, in a format that the
1472 /// Darwin assembler can deal with.
1474 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1475 MCStreamer &Streamer) {
1476 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1478 if (Subtarget->isDarwin())
1479 return new PPCDarwinAsmPrinter(tm, Streamer);
1480 return new PPCLinuxAsmPrinter(tm, Streamer);
1483 // Force static initialization.
1484 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1485 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1486 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1487 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);