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/TargetLoweringObjectFileImpl.h"
38 #include "llvm/IR/Constants.h"
39 #include "llvm/IR/DebugInfo.h"
40 #include "llvm/IR/DerivedTypes.h"
41 #include "llvm/IR/Mangler.h"
42 #include "llvm/IR/Module.h"
43 #include "llvm/MC/MCAsmInfo.h"
44 #include "llvm/MC/MCContext.h"
45 #include "llvm/MC/MCExpr.h"
46 #include "llvm/MC/MCInst.h"
47 #include "llvm/MC/MCInstBuilder.h"
48 #include "llvm/MC/MCSectionELF.h"
49 #include "llvm/MC/MCSectionMachO.h"
50 #include "llvm/MC/MCStreamer.h"
51 #include "llvm/MC/MCSymbol.h"
52 #include "llvm/Support/CommandLine.h"
53 #include "llvm/Support/Debug.h"
54 #include "llvm/Support/ELF.h"
55 #include "llvm/Support/ErrorHandling.h"
56 #include "llvm/Support/MathExtras.h"
57 #include "llvm/Support/TargetRegistry.h"
58 #include "llvm/Support/raw_ostream.h"
59 #include "llvm/Target/TargetInstrInfo.h"
60 #include "llvm/Target/TargetOptions.h"
61 #include "llvm/Target/TargetRegisterInfo.h"
64 #define DEBUG_TYPE "asmprinter"
67 class PPCAsmPrinter : public AsmPrinter {
69 MapVector<MCSymbol*, MCSymbol*> TOC;
70 const PPCSubtarget &Subtarget;
73 explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
74 : AsmPrinter(TM, Streamer),
75 Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
77 const char *getPassName() const override {
78 return "PowerPC Assembly Printer";
81 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
83 void EmitInstruction(const MachineInstr *MI) override;
85 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
87 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
88 unsigned AsmVariant, const char *ExtraCode,
89 raw_ostream &O) override;
90 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
91 unsigned AsmVariant, const char *ExtraCode,
92 raw_ostream &O) override;
95 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
96 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
98 explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
99 : PPCAsmPrinter(TM, Streamer) {}
101 const char *getPassName() const override {
102 return "Linux PPC Assembly Printer";
105 bool doFinalization(Module &M) override;
106 void EmitStartOfAsmFile(Module &M) override;
108 void EmitFunctionEntryLabel() override;
110 void EmitFunctionBodyStart() override;
111 void EmitFunctionBodyEnd() override;
114 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
116 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
118 explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
119 : PPCAsmPrinter(TM, Streamer) {}
121 const char *getPassName() const override {
122 return "Darwin PPC Assembly Printer";
125 bool doFinalization(Module &M) override;
126 void EmitStartOfAsmFile(Module &M) override;
128 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
130 } // end of anonymous namespace
132 /// stripRegisterPrefix - This method strips the character prefix from a
133 /// register name so that only the number is left. Used by for linux asm.
134 static const char *stripRegisterPrefix(const char *RegName) {
135 switch (RegName[0]) {
139 if (RegName[1] == 's')
142 case 'c': if (RegName[1] == 'r') return RegName + 2;
148 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
150 const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout();
151 const MachineOperand &MO = MI->getOperand(OpNo);
153 switch (MO.getType()) {
154 case MachineOperand::MO_Register: {
155 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
156 // Linux assembler (Others?) does not take register mnemonics.
157 // FIXME - What about special registers used in mfspr/mtspr?
158 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
162 case MachineOperand::MO_Immediate:
166 case MachineOperand::MO_MachineBasicBlock:
167 O << *MO.getMBB()->getSymbol();
169 case MachineOperand::MO_ConstantPoolIndex:
170 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
171 << '_' << MO.getIndex();
173 case MachineOperand::MO_BlockAddress:
174 O << *GetBlockAddressSymbol(MO.getBlockAddress());
176 case MachineOperand::MO_GlobalAddress: {
177 // Computing the address of a global symbol, not calling it.
178 const GlobalValue *GV = MO.getGlobal();
179 MCSymbol *SymToPrint;
181 // External or weakly linked global variables need non-lazily-resolved stubs
182 if (TM.getRelocationModel() != Reloc::Static &&
183 (GV->isDeclaration() || GV->isWeakForLinker())) {
184 if (!GV->hasHiddenVisibility()) {
185 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
186 MachineModuleInfoImpl::StubValueTy &StubSym =
187 MMI->getObjFileInfo<MachineModuleInfoMachO>()
188 .getGVStubEntry(SymToPrint);
189 if (!StubSym.getPointer())
190 StubSym = MachineModuleInfoImpl::
191 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
192 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
193 GV->hasAvailableExternallyLinkage()) {
194 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
196 MachineModuleInfoImpl::StubValueTy &StubSym =
197 MMI->getObjFileInfo<MachineModuleInfoMachO>().
198 getHiddenGVStubEntry(SymToPrint);
199 if (!StubSym.getPointer())
200 StubSym = MachineModuleInfoImpl::
201 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
203 SymToPrint = getSymbol(GV);
206 SymToPrint = getSymbol(GV);
211 printOffset(MO.getOffset(), O);
216 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
221 /// PrintAsmOperand - Print out an operand for an inline asm expression.
223 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
225 const char *ExtraCode, raw_ostream &O) {
226 // Does this asm operand have a single letter operand modifier?
227 if (ExtraCode && ExtraCode[0]) {
228 if (ExtraCode[1] != 0) return true; // Unknown modifier.
230 switch (ExtraCode[0]) {
232 // See if this is a generic print operand
233 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
234 case 'c': // Don't print "$" before a global var name or constant.
235 break; // PPC never has a prefix.
236 case 'L': // Write second word of DImode reference.
237 // Verify that this operand has two consecutive registers.
238 if (!MI->getOperand(OpNo).isReg() ||
239 OpNo+1 == MI->getNumOperands() ||
240 !MI->getOperand(OpNo+1).isReg())
242 ++OpNo; // Return the high-part.
245 // Write 'i' if an integer constant, otherwise nothing. Used to print
247 if (MI->getOperand(OpNo).isImm())
253 printOperand(MI, OpNo, O);
257 // At the moment, all inline asm memory operands are a single register.
258 // In any case, the output of this routine should always be just one
259 // assembler operand.
261 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
263 const char *ExtraCode,
265 if (ExtraCode && ExtraCode[0]) {
266 if (ExtraCode[1] != 0) return true; // Unknown modifier.
268 switch (ExtraCode[0]) {
269 default: return true; // Unknown modifier.
270 case 'y': // A memory reference for an X-form instruction
272 const char *RegName = "r0";
273 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
274 O << RegName << ", ";
275 printOperand(MI, OpNo, O);
278 case 'U': // Print 'u' for update form.
279 case 'X': // Print 'x' for indexed form.
281 // FIXME: Currently for PowerPC memory operands are always loaded
282 // into a register, so we never get an update or indexed form.
283 // This is bad even for offset forms, since even if we know we
284 // have a value in -16(r1), we will generate a load into r<n>
285 // and then load from 0(r<n>). Until that issue is fixed,
286 // tolerate 'U' and 'X' but don't output anything.
287 assert(MI->getOperand(OpNo).isReg());
293 assert(MI->getOperand(OpNo).isReg());
295 printOperand(MI, OpNo, O);
301 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
302 /// exists for it. If not, create one. Then return a symbol that references
304 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
305 const DataLayout *DL = TM.getSubtargetImpl()->getDataLayout();
306 MCSymbol *&TOCEntry = TOC[Sym];
308 // To avoid name clash check if the name already exists.
310 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
311 "C" + Twine(TOCLabelID++)) == nullptr) {
312 TOCEntry = GetTempSymbol("C", TOCLabelID);
320 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
321 /// the current output stream.
323 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
325 bool isPPC64 = Subtarget.isPPC64();
326 bool isDarwin = Triple(TM.getTargetTriple()).isOSDarwin();
327 const Module *M = MF->getFunction()->getParent();
328 PICLevel::Level PL = M->getPICLevel();
330 // Lower multi-instruction pseudo operations.
331 switch (MI->getOpcode()) {
333 case TargetOpcode::DBG_VALUE:
334 llvm_unreachable("Should be handled target independently");
335 case PPC::MoveGOTtoLR: {
336 // Transform %LR = MoveGOTtoLR
337 // Into this: bl _GLOBAL_OFFSET_TABLE_@local-4
338 // _GLOBAL_OFFSET_TABLE_@local-4 (instruction preceding
339 // _GLOBAL_OFFSET_TABLE_) has exactly one instruction:
341 // This will return the pointer to _GLOBAL_OFFSET_TABLE_@local
342 MCSymbol *GOTSymbol =
343 OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
344 const MCExpr *OffsExpr =
345 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol,
346 MCSymbolRefExpr::VK_PPC_LOCAL,
348 MCConstantExpr::Create(4, OutContext),
352 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL).addExpr(OffsExpr));
355 case PPC::MovePCtoLR:
356 case PPC::MovePCtoLR8: {
357 // Transform %LR = MovePCtoLR
358 // Into this, where the label is the PIC base:
361 MCSymbol *PICBase = MF->getPICBaseSymbol();
364 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
365 // FIXME: We would like an efficient form for this, so we don't have to do
366 // a lot of extra uniquing.
367 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
370 OutStreamer.EmitLabel(PICBase);
373 case PPC::UpdateGBR: {
374 // Transform %Rd = UpdateGBR(%Rt, %Ri)
375 // Into: lwz %Rt, .L0$poff - .L0$pb(%Ri)
377 // Get the offset from the GOT Base Register to the GOT
378 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
379 MCSymbol *PICOffset =
380 MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
381 TmpInst.setOpcode(PPC::LWZ);
383 MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
385 MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
386 MCSymbolRefExpr::VK_None,
388 const MCOperand TR = TmpInst.getOperand(1);
389 const MCOperand PICR = TmpInst.getOperand(0);
391 // Step 1: lwz %Rt, .L$poff - .L$pb(%Ri)
392 TmpInst.getOperand(1) =
393 MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp, PB, OutContext));
394 TmpInst.getOperand(0) = TR;
395 TmpInst.getOperand(2) = PICR;
396 EmitToStreamer(OutStreamer, TmpInst);
398 TmpInst.setOpcode(PPC::ADD4);
399 TmpInst.getOperand(0) = PICR;
400 TmpInst.getOperand(1) = TR;
401 TmpInst.getOperand(2) = PICR;
402 EmitToStreamer(OutStreamer, TmpInst);
406 // Transform %R3 = LWZtoc <ga:@min1>, %R2
407 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
409 // Change the opcode to LWZ, and the global address operand to be a
410 // reference to the GOT entry we will synthesize later.
411 TmpInst.setOpcode(PPC::LWZ);
412 const MachineOperand &MO = MI->getOperand(1);
414 // Map symbol -> label of TOC entry
415 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
416 MCSymbol *MOSymbol = nullptr;
418 MOSymbol = getSymbol(MO.getGlobal());
420 MOSymbol = GetCPISymbol(MO.getIndex());
422 MOSymbol = GetJTISymbol(MO.getIndex());
423 else if (MO.isBlockAddress())
424 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
426 if (PL == PICLevel::Small) {
428 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_GOT,
430 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
432 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
435 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
438 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
440 Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
441 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
443 EmitToStreamer(OutStreamer, TmpInst);
450 // Transform %X3 = LDtoc <ga:@min1>, %X2
451 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
453 // Change the opcode to LD, and the global address operand to be a
454 // reference to the TOC entry we will synthesize later.
455 TmpInst.setOpcode(PPC::LD);
456 const MachineOperand &MO = MI->getOperand(1);
458 // Map symbol -> label of TOC entry
459 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
460 MCSymbol *MOSymbol = nullptr;
462 MOSymbol = getSymbol(MO.getGlobal());
464 MOSymbol = GetCPISymbol(MO.getIndex());
466 MOSymbol = GetJTISymbol(MO.getIndex());
467 else if (MO.isBlockAddress())
468 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
470 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
473 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
475 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
476 EmitToStreamer(OutStreamer, TmpInst);
480 case PPC::ADDIStocHA: {
481 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
482 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
484 // Change the opcode to ADDIS8. If the global address is external, has
485 // common linkage, is a non-local function address, or is a jump table
486 // address, then generate a TOC entry and reference that. Otherwise
487 // reference the symbol directly.
488 TmpInst.setOpcode(PPC::ADDIS8);
489 const MachineOperand &MO = MI->getOperand(2);
490 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
491 MO.isBlockAddress()) &&
492 "Invalid operand for ADDIStocHA!");
493 MCSymbol *MOSymbol = nullptr;
494 bool IsExternal = false;
495 bool IsNonLocalFunction = false;
496 bool IsCommon = false;
497 bool IsAvailExt = false;
500 const GlobalValue *GV = MO.getGlobal();
501 MOSymbol = getSymbol(GV);
502 IsExternal = GV->isDeclaration();
503 IsCommon = GV->hasCommonLinkage();
504 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
505 (GV->isDeclaration() || GV->isWeakForLinker());
506 IsAvailExt = GV->hasAvailableExternallyLinkage();
507 } else if (MO.isCPI())
508 MOSymbol = GetCPISymbol(MO.getIndex());
510 MOSymbol = GetJTISymbol(MO.getIndex());
511 else if (MO.isBlockAddress())
512 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
514 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
515 MO.isJTI() || MO.isBlockAddress() ||
516 TM.getCodeModel() == CodeModel::Large)
517 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
520 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
522 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
523 EmitToStreamer(OutStreamer, TmpInst);
527 // Transform %Xd = LDtocL <ga:@sym>, %Xs
528 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
530 // Change the opcode to LD. If the global address is external, has
531 // common linkage, or is a jump table address, then reference the
532 // associated TOC entry. Otherwise reference the symbol directly.
533 TmpInst.setOpcode(PPC::LD);
534 const MachineOperand &MO = MI->getOperand(1);
535 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
536 MO.isBlockAddress()) &&
537 "Invalid operand for LDtocL!");
538 MCSymbol *MOSymbol = nullptr;
541 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
542 else if (MO.isBlockAddress()) {
543 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
544 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
546 else if (MO.isCPI()) {
547 MOSymbol = GetCPISymbol(MO.getIndex());
548 if (TM.getCodeModel() == CodeModel::Large)
549 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
551 else if (MO.isGlobal()) {
552 const GlobalValue *GValue = MO.getGlobal();
553 MOSymbol = getSymbol(GValue);
554 if (GValue->getType()->getElementType()->isFunctionTy() ||
555 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
556 GValue->hasAvailableExternallyLinkage() ||
557 TM.getCodeModel() == CodeModel::Large)
558 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
562 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
564 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
565 EmitToStreamer(OutStreamer, TmpInst);
568 case PPC::ADDItocL: {
569 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
570 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
572 // Change the opcode to ADDI8. If the global address is external, then
573 // generate a TOC entry and reference that. Otherwise reference the
575 TmpInst.setOpcode(PPC::ADDI8);
576 const MachineOperand &MO = MI->getOperand(2);
577 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
578 MCSymbol *MOSymbol = nullptr;
579 bool IsExternal = false;
580 bool IsNonLocalFunction = false;
583 const GlobalValue *GV = MO.getGlobal();
584 MOSymbol = getSymbol(GV);
585 IsExternal = GV->isDeclaration();
586 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
587 (GV->isDeclaration() || GV->isWeakForLinker());
588 } else if (MO.isCPI())
589 MOSymbol = GetCPISymbol(MO.getIndex());
591 if (IsNonLocalFunction || IsExternal ||
592 TM.getCodeModel() == CodeModel::Large)
593 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
596 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
598 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
599 EmitToStreamer(OutStreamer, TmpInst);
602 case PPC::ADDISgotTprelHA: {
603 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
604 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
605 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
606 const MachineOperand &MO = MI->getOperand(2);
607 const GlobalValue *GValue = MO.getGlobal();
608 MCSymbol *MOSymbol = getSymbol(GValue);
609 const MCExpr *SymGotTprel =
610 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
612 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
613 .addReg(MI->getOperand(0).getReg())
615 .addExpr(SymGotTprel));
618 case PPC::LDgotTprelL:
619 case PPC::LDgotTprelL32: {
620 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
621 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
623 // Change the opcode to LD.
624 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
625 const MachineOperand &MO = MI->getOperand(1);
626 const GlobalValue *GValue = MO.getGlobal();
627 MCSymbol *MOSymbol = getSymbol(GValue);
629 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
631 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
632 EmitToStreamer(OutStreamer, TmpInst);
636 case PPC::PPC32PICGOT: {
637 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
638 MCSymbol *GOTRef = OutContext.CreateTempSymbol();
639 MCSymbol *NextInstr = OutContext.CreateTempSymbol();
641 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
642 // FIXME: We would like an efficient form for this, so we don't have to do
643 // a lot of extra uniquing.
644 .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
645 const MCExpr *OffsExpr =
646 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
647 MCSymbolRefExpr::Create(GOTRef, OutContext),
649 OutStreamer.EmitLabel(GOTRef);
650 OutStreamer.EmitValue(OffsExpr, 4);
651 OutStreamer.EmitLabel(NextInstr);
652 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
653 .addReg(MI->getOperand(0).getReg()));
654 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
655 .addReg(MI->getOperand(1).getReg())
657 .addReg(MI->getOperand(0).getReg()));
658 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
659 .addReg(MI->getOperand(0).getReg())
660 .addReg(MI->getOperand(1).getReg())
661 .addReg(MI->getOperand(0).getReg()));
664 case PPC::PPC32GOT: {
665 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
666 const MCExpr *SymGotTlsL =
667 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
669 const MCExpr *SymGotTlsHA =
670 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
672 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
673 .addReg(MI->getOperand(0).getReg())
674 .addExpr(SymGotTlsL));
675 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
676 .addReg(MI->getOperand(0).getReg())
677 .addReg(MI->getOperand(0).getReg())
678 .addExpr(SymGotTlsHA));
681 case PPC::ADDIStlsgdHA: {
682 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
683 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
684 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
685 const MachineOperand &MO = MI->getOperand(2);
686 const GlobalValue *GValue = MO.getGlobal();
687 MCSymbol *MOSymbol = getSymbol(GValue);
688 const MCExpr *SymGotTlsGD =
689 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
691 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
692 .addReg(MI->getOperand(0).getReg())
694 .addExpr(SymGotTlsGD));
697 case PPC::ADDItlsgdL:
698 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
699 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
700 case PPC::ADDItlsgdL32: {
701 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
702 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
703 const MachineOperand &MO = MI->getOperand(2);
704 const GlobalValue *GValue = MO.getGlobal();
705 MCSymbol *MOSymbol = getSymbol(GValue);
706 const MCExpr *SymGotTlsGD =
707 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
708 MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO :
709 MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
711 EmitToStreamer(OutStreamer,
712 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
713 .addReg(MI->getOperand(0).getReg())
714 .addReg(MI->getOperand(1).getReg())
715 .addExpr(SymGotTlsGD));
718 case PPC::ADDIStlsldHA: {
719 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
720 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
721 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
722 const MachineOperand &MO = MI->getOperand(2);
723 const GlobalValue *GValue = MO.getGlobal();
724 MCSymbol *MOSymbol = getSymbol(GValue);
725 const MCExpr *SymGotTlsLD =
726 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
728 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
729 .addReg(MI->getOperand(0).getReg())
731 .addExpr(SymGotTlsLD));
734 case PPC::ADDItlsldL:
735 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
736 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
737 case PPC::ADDItlsldL32: {
738 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
739 // Into: %Rd = ADDI %Rs, sym@got@tlsld
740 const MachineOperand &MO = MI->getOperand(2);
741 const GlobalValue *GValue = MO.getGlobal();
742 MCSymbol *MOSymbol = getSymbol(GValue);
743 const MCExpr *SymGotTlsLD =
744 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
745 MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO :
746 MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
748 EmitToStreamer(OutStreamer,
749 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
750 .addReg(MI->getOperand(0).getReg())
751 .addReg(MI->getOperand(1).getReg())
752 .addExpr(SymGotTlsLD));
755 case PPC::ADDISdtprelHA:
756 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
757 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
758 case PPC::ADDISdtprelHA32: {
759 // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
760 // Into: %Rd = ADDIS %R3, sym@dtprel@ha
761 const MachineOperand &MO = MI->getOperand(2);
762 const GlobalValue *GValue = MO.getGlobal();
763 MCSymbol *MOSymbol = getSymbol(GValue);
764 const MCExpr *SymDtprel =
765 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
767 EmitToStreamer(OutStreamer,
768 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
769 .addReg(MI->getOperand(0).getReg())
770 .addReg(Subtarget.isPPC64() ? PPC::X3 : PPC::R3)
771 .addExpr(SymDtprel));
774 case PPC::ADDIdtprelL:
775 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
776 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
777 case PPC::ADDIdtprelL32: {
778 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
779 // Into: %Rd = ADDI %Rs, sym@dtprel@l
780 const MachineOperand &MO = MI->getOperand(2);
781 const GlobalValue *GValue = MO.getGlobal();
782 MCSymbol *MOSymbol = getSymbol(GValue);
783 const MCExpr *SymDtprel =
784 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
786 EmitToStreamer(OutStreamer,
787 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
788 .addReg(MI->getOperand(0).getReg())
789 .addReg(MI->getOperand(1).getReg())
790 .addExpr(SymDtprel));
795 if (!Subtarget.hasMFOCRF()) {
796 // Transform: %R3 = MFOCRF %CR7
797 // Into: %R3 = MFCR ;; cr7
799 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
800 OutStreamer.AddComment(PPCInstPrinter::
801 getRegisterName(MI->getOperand(1).getReg()));
802 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
803 .addReg(MI->getOperand(0).getReg()));
809 if (!Subtarget.hasMFOCRF()) {
810 // Transform: %CR7 = MTOCRF %R3
811 // Into: MTCRF mask, %R3 ;; cr7
813 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
814 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
815 ->getEncodingValue(MI->getOperand(0).getReg());
816 OutStreamer.AddComment(PPCInstPrinter::
817 getRegisterName(MI->getOperand(0).getReg()));
818 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
820 .addReg(MI->getOperand(1).getReg()));
828 // Verify alignment is legal, so we don't create relocations
829 // that can't be supported.
830 // FIXME: This test is currently disabled for Darwin. The test
831 // suite shows a handful of test cases that fail this check for
832 // Darwin. Those need to be investigated before this sanity test
833 // can be enabled for those subtargets.
834 if (!Subtarget.isDarwin()) {
835 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
836 const MachineOperand &MO = MI->getOperand(OpNum);
837 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
838 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
840 // Now process the instruction normally.
845 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
846 EmitToStreamer(OutStreamer, TmpInst);
849 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
850 if (Subtarget.isELFv2ABI()) {
851 PPCTargetStreamer *TS =
852 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
855 TS->emitAbiVersion(2);
858 if (Subtarget.isPPC64() || TM.getRelocationModel() != Reloc::PIC_)
859 return AsmPrinter::EmitStartOfAsmFile(M);
861 if (M.getPICLevel() == PICLevel::Small)
862 return AsmPrinter::EmitStartOfAsmFile(M);
864 OutStreamer.SwitchSection(OutContext.getELFSection(".got2",
865 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
866 SectionKind::getReadOnly()));
868 MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".LTOC"));
869 MCSymbol *CurrentPos = OutContext.CreateTempSymbol();
871 OutStreamer.EmitLabel(CurrentPos);
873 // The GOT pointer points to the middle of the GOT, in order to reference the
874 // entire 64kB range. 0x8000 is the midpoint.
875 const MCExpr *tocExpr =
876 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
877 MCConstantExpr::Create(0x8000, OutContext),
880 OutStreamer.EmitAssignment(TOCSym, tocExpr);
882 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
885 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
886 // linux/ppc32 - Normal entry label.
887 if (!Subtarget.isPPC64() &&
888 (TM.getRelocationModel() != Reloc::PIC_ ||
889 MF->getFunction()->getParent()->getPICLevel() == PICLevel::Small))
890 return AsmPrinter::EmitFunctionEntryLabel();
892 if (!Subtarget.isPPC64()) {
893 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
894 if (PPCFI->usesPICBase()) {
895 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
896 MCSymbol *PICBase = MF->getPICBaseSymbol();
897 OutStreamer.EmitLabel(RelocSymbol);
899 const MCExpr *OffsExpr =
900 MCBinaryExpr::CreateSub(
901 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".LTOC")),
903 MCSymbolRefExpr::Create(PICBase, OutContext),
905 OutStreamer.EmitValue(OffsExpr, 4);
906 OutStreamer.EmitLabel(CurrentFnSym);
909 return AsmPrinter::EmitFunctionEntryLabel();
912 // ELFv2 ABI - Normal entry label.
913 if (Subtarget.isELFv2ABI())
914 return AsmPrinter::EmitFunctionEntryLabel();
916 // Emit an official procedure descriptor.
917 MCSectionSubPair Current = OutStreamer.getCurrentSection();
918 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
919 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
920 SectionKind::getReadOnly());
921 OutStreamer.SwitchSection(Section);
922 OutStreamer.EmitLabel(CurrentFnSym);
923 OutStreamer.EmitValueToAlignment(8);
925 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
926 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
928 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
930 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
931 // Generates a R_PPC64_TOC relocation for TOC base insertion.
932 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
933 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
935 // Emit a null environment pointer.
936 OutStreamer.EmitIntValue(0, 8 /* size */);
937 OutStreamer.SwitchSection(Current.first, Current.second);
939 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
940 ".L." + Twine(CurrentFnSym->getName()));
941 OutStreamer.EmitLabel(RealFnSym);
942 CurrentFnSymForSize = RealFnSym;
946 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
947 const DataLayout *TD = TM.getSubtargetImpl()->getDataLayout();
949 bool isPPC64 = TD->getPointerSizeInBits() == 64;
951 PPCTargetStreamer &TS =
952 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
955 const MCSectionELF *Section;
958 Section = OutStreamer.getContext().getELFSection(".toc",
959 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
960 SectionKind::getReadOnly());
962 Section = OutStreamer.getContext().getELFSection(".got2",
963 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
964 SectionKind::getReadOnly());
965 OutStreamer.SwitchSection(Section);
967 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
968 E = TOC.end(); I != E; ++I) {
969 OutStreamer.EmitLabel(I->second);
970 MCSymbol *S = I->first;
974 OutStreamer.EmitSymbolValue(S, 4);
978 MachineModuleInfoELF &MMIELF =
979 MMI->getObjFileInfo<MachineModuleInfoELF>();
981 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
982 if (!Stubs.empty()) {
983 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
984 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
986 OutStreamer.EmitLabel(Stubs[i].first);
988 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
990 isPPC64 ? 8 : 4/*size*/);
994 OutStreamer.AddBlankLine();
997 return AsmPrinter::doFinalization(M);
1000 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1001 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1002 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1003 // provide two entry points. The ABI guarantees that when calling the
1004 // local entry point, r2 is set up by the caller to contain the TOC base
1005 // for this function, and when calling the global entry point, r12 is set
1006 // up by the caller to hold the address of the global entry point. We
1007 // thus emit a prefix sequence along the following lines:
1010 // # global entry point
1011 // addis r2,r12,(.TOC.-func)@ha
1012 // addi r2,r2,(.TOC.-func)@l
1013 // .localentry func, .-func
1014 // # local entry point, followed by function body
1016 // This ensures we have r2 set up correctly while executing the function
1017 // body, no matter which entry point is called.
1018 if (Subtarget.isELFv2ABI()
1019 // Only do all that if the function uses r2 in the first place.
1020 && !MF->getRegInfo().use_empty(PPC::X2)) {
1022 MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol();
1023 OutStreamer.EmitLabel(GlobalEntryLabel);
1024 const MCSymbolRefExpr *GlobalEntryLabelExp =
1025 MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext);
1027 MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1028 const MCExpr *TOCDeltaExpr =
1029 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext),
1030 GlobalEntryLabelExp, OutContext);
1032 const MCExpr *TOCDeltaHi =
1033 PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext);
1034 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1037 .addExpr(TOCDeltaHi));
1039 const MCExpr *TOCDeltaLo =
1040 PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext);
1041 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI)
1044 .addExpr(TOCDeltaLo));
1046 MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol();
1047 OutStreamer.EmitLabel(LocalEntryLabel);
1048 const MCSymbolRefExpr *LocalEntryLabelExp =
1049 MCSymbolRefExpr::Create(LocalEntryLabel, OutContext);
1050 const MCExpr *LocalOffsetExp =
1051 MCBinaryExpr::CreateSub(LocalEntryLabelExp,
1052 GlobalEntryLabelExp, OutContext);
1054 PPCTargetStreamer *TS =
1055 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1058 TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp);
1062 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1065 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1066 // Only the 64-bit target requires a traceback table. For now,
1067 // we only emit the word of zeroes that GDB requires to find
1068 // the end of the function, and zeroes for the eight-byte
1069 // mandatory fields.
1070 // FIXME: We should fill in the eight-byte mandatory fields as described in
1071 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1072 // currently make use of these fields).
1073 if (Subtarget.isPPC64()) {
1074 OutStreamer.EmitIntValue(0, 4/*size*/);
1075 OutStreamer.EmitIntValue(0, 8/*size*/);
1079 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1080 static const char *const CPUDirectives[] = {
1104 unsigned Directive = Subtarget.getDarwinDirective();
1105 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
1106 Directive = PPC::DIR_970;
1107 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
1108 Directive = PPC::DIR_7400;
1109 if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
1110 Directive = PPC::DIR_64;
1111 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1113 assert(Directive < array_lengthof(CPUDirectives) &&
1114 "CPUDirectives[] might not be up-to-date!");
1115 PPCTargetStreamer &TStreamer =
1116 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1117 TStreamer.emitMachine(CPUDirectives[Directive]);
1119 // Prime text sections so they are adjacent. This reduces the likelihood a
1120 // large data or debug section causes a branch to exceed 16M limit.
1121 const TargetLoweringObjectFileMachO &TLOFMacho =
1122 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1123 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
1124 if (TM.getRelocationModel() == Reloc::PIC_) {
1125 OutStreamer.SwitchSection(
1126 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1127 MachO::S_SYMBOL_STUBS |
1128 MachO::S_ATTR_PURE_INSTRUCTIONS,
1129 32, SectionKind::getText()));
1130 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1131 OutStreamer.SwitchSection(
1132 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1133 MachO::S_SYMBOL_STUBS |
1134 MachO::S_ATTR_PURE_INSTRUCTIONS,
1135 16, SectionKind::getText()));
1137 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1140 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1141 // Remove $stub suffix, add $lazy_ptr.
1142 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1143 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
1146 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1147 // Add $tmp suffix to $stub, yielding $stub$tmp.
1148 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
1151 void PPCDarwinAsmPrinter::
1152 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1154 TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64;
1155 bool isDarwin = Subtarget.isDarwin();
1157 const TargetLoweringObjectFileMachO &TLOFMacho =
1158 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1160 // .lazy_symbol_pointer
1161 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1163 // Output stubs for dynamically-linked functions
1164 if (TM.getRelocationModel() == Reloc::PIC_) {
1165 const MCSection *StubSection =
1166 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1167 MachO::S_SYMBOL_STUBS |
1168 MachO::S_ATTR_PURE_INSTRUCTIONS,
1169 32, SectionKind::getText());
1170 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1171 OutStreamer.SwitchSection(StubSection);
1174 MCSymbol *Stub = Stubs[i].first;
1175 MCSymbol *RawSym = Stubs[i].second.getPointer();
1176 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1177 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1179 OutStreamer.EmitLabel(Stub);
1180 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1182 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
1183 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1185 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
1188 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1189 // bcl 20, 31, AnonSymbol
1190 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1191 OutStreamer.EmitLabel(AnonSymbol);
1193 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1194 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1195 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
1196 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1201 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1203 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1204 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1205 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
1206 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1208 .addExpr(SubLo16).addExpr(SubLo16)
1211 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1213 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1215 OutStreamer.SwitchSection(LSPSection);
1216 OutStreamer.EmitLabel(LazyPtr);
1217 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1219 MCSymbol *DyldStubBindingHelper =
1220 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1222 // .quad dyld_stub_binding_helper
1223 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1225 // .long dyld_stub_binding_helper
1226 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1229 OutStreamer.AddBlankLine();
1233 const MCSection *StubSection =
1234 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1235 MachO::S_SYMBOL_STUBS |
1236 MachO::S_ATTR_PURE_INSTRUCTIONS,
1237 16, SectionKind::getText());
1238 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1239 MCSymbol *Stub = Stubs[i].first;
1240 MCSymbol *RawSym = Stubs[i].second.getPointer();
1241 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1242 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1244 OutStreamer.SwitchSection(StubSection);
1246 OutStreamer.EmitLabel(Stub);
1247 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1249 // lis r11, ha16(LazyPtr)
1250 const MCExpr *LazyPtrHa16 =
1251 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
1252 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
1254 .addExpr(LazyPtrHa16));
1256 // ldu r12, lo16(LazyPtr)(r11)
1257 // lwzu r12, lo16(LazyPtr)(r11)
1258 const MCExpr *LazyPtrLo16 =
1259 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1260 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1262 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1266 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1268 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1270 OutStreamer.SwitchSection(LSPSection);
1271 OutStreamer.EmitLabel(LazyPtr);
1272 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1274 MCSymbol *DyldStubBindingHelper =
1275 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1277 // .quad dyld_stub_binding_helper
1278 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1280 // .long dyld_stub_binding_helper
1281 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1285 OutStreamer.AddBlankLine();
1289 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1291 TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64;
1293 // Darwin/PPC always uses mach-o.
1294 const TargetLoweringObjectFileMachO &TLOFMacho =
1295 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1296 MachineModuleInfoMachO &MMIMacho =
1297 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1299 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1301 EmitFunctionStubs(Stubs);
1303 if (MAI->doesSupportExceptionHandling() && MMI) {
1304 // Add the (possibly multiple) personalities to the set of global values.
1305 // Only referenced functions get into the Personalities list.
1306 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1307 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1308 E = Personalities.end(); I != E; ++I) {
1310 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1311 MachineModuleInfoImpl::StubValueTy &StubSym =
1312 MMIMacho.getGVStubEntry(NLPSym);
1313 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1318 // Output stubs for dynamically-linked functions.
1319 Stubs = MMIMacho.GetGVStubList();
1321 // Output macho stubs for external and common global variables.
1322 if (!Stubs.empty()) {
1323 // Switch with ".non_lazy_symbol_pointer" directive.
1324 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1325 EmitAlignment(isPPC64 ? 3 : 2);
1327 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1329 OutStreamer.EmitLabel(Stubs[i].first);
1330 // .indirect_symbol _foo
1331 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1332 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1335 // External to current translation unit.
1336 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1338 // Internal to current translation unit.
1340 // When we place the LSDA into the TEXT section, the type info pointers
1341 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1342 // However, sometimes the types are local to the file. So we need to
1343 // fill in the value for the NLP in those cases.
1344 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1346 isPPC64 ? 8 : 4/*size*/);
1350 OutStreamer.AddBlankLine();
1353 Stubs = MMIMacho.GetHiddenGVStubList();
1354 if (!Stubs.empty()) {
1355 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1356 EmitAlignment(isPPC64 ? 3 : 2);
1358 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1360 OutStreamer.EmitLabel(Stubs[i].first);
1362 OutStreamer.EmitValue(MCSymbolRefExpr::
1363 Create(Stubs[i].second.getPointer(),
1365 isPPC64 ? 8 : 4/*size*/);
1369 OutStreamer.AddBlankLine();
1372 // Funny Darwin hack: This flag tells the linker that no global symbols
1373 // contain code that falls through to other global symbols (e.g. the obvious
1374 // implementation of multiple entry points). If this doesn't occur, the
1375 // linker can safely perform dead code stripping. Since LLVM never generates
1376 // code that does this, it is always safe to set.
1377 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1379 return AsmPrinter::doFinalization(M);
1382 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1383 /// for a MachineFunction to the given output stream, in a format that the
1384 /// Darwin assembler can deal with.
1386 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1387 MCStreamer &Streamer) {
1388 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1390 if (Subtarget->isDarwin())
1391 return new PPCDarwinAsmPrinter(tm, Streamer);
1392 return new PPCLinuxAsmPrinter(tm, Streamer);
1395 // Force static initialization.
1396 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1397 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1398 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1399 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);