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();
327 // Lower multi-instruction pseudo operations.
328 switch (MI->getOpcode()) {
330 case TargetOpcode::DBG_VALUE:
331 llvm_unreachable("Should be handled target independently");
332 case PPC::MovePCtoLR:
333 case PPC::MovePCtoLR8: {
334 // Transform %LR = MovePCtoLR
335 // Into this, where the label is the PIC base:
338 MCSymbol *PICBase = MF->getPICBaseSymbol();
341 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
342 // FIXME: We would like an efficient form for this, so we don't have to do
343 // a lot of extra uniquing.
344 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
347 OutStreamer.EmitLabel(PICBase);
351 // Get the offset from the GOT Base Register to the GOT
352 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
353 MCSymbol *PICOffset = MF->getInfo<PPCFunctionInfo>()->getPICOffsetSymbol();
354 TmpInst.setOpcode(PPC::LWZ);
356 MCSymbolRefExpr::Create(PICOffset, MCSymbolRefExpr::VK_None, OutContext);
358 MCSymbolRefExpr::Create(MF->getPICBaseSymbol(),
359 MCSymbolRefExpr::VK_None,
361 const MCOperand MO = TmpInst.getOperand(1);
362 TmpInst.getOperand(1) = MCOperand::CreateExpr(MCBinaryExpr::CreateSub(Exp,
365 TmpInst.addOperand(MO);
366 EmitToStreamer(OutStreamer, TmpInst);
369 case PPC::UpdateGBR: {
370 // Update the GOT Base Register to point to the GOT. It may be possible to
371 // merge this with the PPC::GetGBRO, doing it all in one step.
372 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
373 TmpInst.setOpcode(PPC::ADD4);
374 TmpInst.addOperand(TmpInst.getOperand(0));
375 EmitToStreamer(OutStreamer, TmpInst);
379 // Transform %X3 = LWZtoc <ga:@min1>, %X2
380 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
382 // Change the opcode to LWZ, and the global address operand to be a
383 // reference to the GOT entry we will synthesize later.
384 TmpInst.setOpcode(PPC::LWZ);
385 const MachineOperand &MO = MI->getOperand(1);
387 // Map symbol -> label of TOC entry
388 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
389 MCSymbol *MOSymbol = nullptr;
391 MOSymbol = getSymbol(MO.getGlobal());
393 MOSymbol = GetCPISymbol(MO.getIndex());
395 MOSymbol = GetJTISymbol(MO.getIndex());
396 else if (MO.isBlockAddress())
397 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
399 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
402 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_None,
405 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".L.TOC.")),
407 Exp = MCBinaryExpr::CreateSub(Exp, PB, OutContext);
408 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
409 EmitToStreamer(OutStreamer, TmpInst);
416 // Transform %X3 = LDtoc <ga:@min1>, %X2
417 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
419 // Change the opcode to LD, and the global address operand to be a
420 // reference to the TOC entry we will synthesize later.
421 TmpInst.setOpcode(PPC::LD);
422 const MachineOperand &MO = MI->getOperand(1);
424 // Map symbol -> label of TOC entry
425 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress());
426 MCSymbol *MOSymbol = nullptr;
428 MOSymbol = getSymbol(MO.getGlobal());
430 MOSymbol = GetCPISymbol(MO.getIndex());
432 MOSymbol = GetJTISymbol(MO.getIndex());
433 else if (MO.isBlockAddress())
434 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
436 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
439 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
441 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
442 EmitToStreamer(OutStreamer, TmpInst);
446 case PPC::ADDIStocHA: {
447 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
448 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
450 // Change the opcode to ADDIS8. If the global address is external, has
451 // common linkage, is a non-local function address, or is a jump table
452 // address, then generate a TOC entry and reference that. Otherwise
453 // reference the symbol directly.
454 TmpInst.setOpcode(PPC::ADDIS8);
455 const MachineOperand &MO = MI->getOperand(2);
456 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
457 MO.isBlockAddress()) &&
458 "Invalid operand for ADDIStocHA!");
459 MCSymbol *MOSymbol = nullptr;
460 bool IsExternal = false;
461 bool IsNonLocalFunction = false;
462 bool IsCommon = false;
463 bool IsAvailExt = false;
466 const GlobalValue *GV = MO.getGlobal();
467 MOSymbol = getSymbol(GV);
468 IsExternal = GV->isDeclaration();
469 IsCommon = GV->hasCommonLinkage();
470 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
471 (GV->isDeclaration() || GV->isWeakForLinker());
472 IsAvailExt = GV->hasAvailableExternallyLinkage();
473 } else if (MO.isCPI())
474 MOSymbol = GetCPISymbol(MO.getIndex());
476 MOSymbol = GetJTISymbol(MO.getIndex());
477 else if (MO.isBlockAddress())
478 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
480 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
481 MO.isJTI() || MO.isBlockAddress() ||
482 TM.getCodeModel() == CodeModel::Large)
483 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
486 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
488 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
489 EmitToStreamer(OutStreamer, TmpInst);
493 // Transform %Xd = LDtocL <ga:@sym>, %Xs
494 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
496 // Change the opcode to LD. If the global address is external, has
497 // common linkage, or is a jump table address, then reference the
498 // associated TOC entry. Otherwise reference the symbol directly.
499 TmpInst.setOpcode(PPC::LD);
500 const MachineOperand &MO = MI->getOperand(1);
501 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() ||
502 MO.isBlockAddress()) &&
503 "Invalid operand for LDtocL!");
504 MCSymbol *MOSymbol = nullptr;
507 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
508 else if (MO.isBlockAddress()) {
509 MOSymbol = GetBlockAddressSymbol(MO.getBlockAddress());
510 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
512 else if (MO.isCPI()) {
513 MOSymbol = GetCPISymbol(MO.getIndex());
514 if (TM.getCodeModel() == CodeModel::Large)
515 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
517 else if (MO.isGlobal()) {
518 const GlobalValue *GValue = MO.getGlobal();
519 MOSymbol = getSymbol(GValue);
520 if (GValue->getType()->getElementType()->isFunctionTy() ||
521 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
522 GValue->hasAvailableExternallyLinkage() ||
523 TM.getCodeModel() == CodeModel::Large)
524 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
528 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
530 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
531 EmitToStreamer(OutStreamer, TmpInst);
534 case PPC::ADDItocL: {
535 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
536 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
538 // Change the opcode to ADDI8. If the global address is external, then
539 // generate a TOC entry and reference that. Otherwise reference the
541 TmpInst.setOpcode(PPC::ADDI8);
542 const MachineOperand &MO = MI->getOperand(2);
543 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
544 MCSymbol *MOSymbol = nullptr;
545 bool IsExternal = false;
546 bool IsNonLocalFunction = false;
549 const GlobalValue *GV = MO.getGlobal();
550 MOSymbol = getSymbol(GV);
551 IsExternal = GV->isDeclaration();
552 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
553 (GV->isDeclaration() || GV->isWeakForLinker());
554 } else if (MO.isCPI())
555 MOSymbol = GetCPISymbol(MO.getIndex());
557 if (IsNonLocalFunction || IsExternal ||
558 TM.getCodeModel() == CodeModel::Large)
559 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
562 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
564 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
565 EmitToStreamer(OutStreamer, TmpInst);
568 case PPC::ADDISgotTprelHA: {
569 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
570 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
571 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
572 const MachineOperand &MO = MI->getOperand(2);
573 const GlobalValue *GValue = MO.getGlobal();
574 MCSymbol *MOSymbol = getSymbol(GValue);
575 const MCExpr *SymGotTprel =
576 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
578 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
579 .addReg(MI->getOperand(0).getReg())
581 .addExpr(SymGotTprel));
584 case PPC::LDgotTprelL:
585 case PPC::LDgotTprelL32: {
586 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
587 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
589 // Change the opcode to LD.
590 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
591 const MachineOperand &MO = MI->getOperand(1);
592 const GlobalValue *GValue = MO.getGlobal();
593 MCSymbol *MOSymbol = getSymbol(GValue);
595 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
597 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
598 EmitToStreamer(OutStreamer, TmpInst);
602 case PPC::PPC32PICGOT: {
603 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
604 MCSymbol *GOTRef = OutContext.CreateTempSymbol();
605 MCSymbol *NextInstr = OutContext.CreateTempSymbol();
607 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
608 // FIXME: We would like an efficient form for this, so we don't have to do
609 // a lot of extra uniquing.
610 .addExpr(MCSymbolRefExpr::Create(NextInstr, OutContext)));
611 const MCExpr *OffsExpr =
612 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(GOTSymbol, OutContext),
613 MCSymbolRefExpr::Create(GOTRef, OutContext),
615 OutStreamer.EmitLabel(GOTRef);
616 OutStreamer.EmitValue(OffsExpr, 4);
617 OutStreamer.EmitLabel(NextInstr);
618 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR)
619 .addReg(MI->getOperand(0).getReg()));
620 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LWZ)
621 .addReg(MI->getOperand(1).getReg())
623 .addReg(MI->getOperand(0).getReg()));
624 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADD4)
625 .addReg(MI->getOperand(0).getReg())
626 .addReg(MI->getOperand(1).getReg())
627 .addReg(MI->getOperand(0).getReg()));
630 case PPC::PPC32GOT: {
631 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
632 const MCExpr *SymGotTlsL =
633 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
635 const MCExpr *SymGotTlsHA =
636 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
638 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
639 .addReg(MI->getOperand(0).getReg())
640 .addExpr(SymGotTlsL));
641 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
642 .addReg(MI->getOperand(0).getReg())
643 .addReg(MI->getOperand(0).getReg())
644 .addExpr(SymGotTlsHA));
647 case PPC::ADDIStlsgdHA: {
648 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
649 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
650 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
651 const MachineOperand &MO = MI->getOperand(2);
652 const GlobalValue *GValue = MO.getGlobal();
653 MCSymbol *MOSymbol = getSymbol(GValue);
654 const MCExpr *SymGotTlsGD =
655 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
657 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
658 .addReg(MI->getOperand(0).getReg())
660 .addExpr(SymGotTlsGD));
663 case PPC::ADDItlsgdL:
664 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
665 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
666 case PPC::ADDItlsgdL32: {
667 // Transform: %Rd = ADDItlsgdL32 %Rs, <ga:@sym>
668 // Into: %Rd = ADDI %Rs, sym@got@tlsgd
669 const MachineOperand &MO = MI->getOperand(2);
670 const GlobalValue *GValue = MO.getGlobal();
671 MCSymbol *MOSymbol = getSymbol(GValue);
672 const MCExpr *SymGotTlsGD =
673 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
674 MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO :
675 MCSymbolRefExpr::VK_PPC_GOT_TLSGD,
677 EmitToStreamer(OutStreamer,
678 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
679 .addReg(MI->getOperand(0).getReg())
680 .addReg(MI->getOperand(1).getReg())
681 .addExpr(SymGotTlsGD));
684 case PPC::GETtlsADDR:
685 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
686 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsgd)
687 case PPC::GETtlsADDR32: {
688 // Transform: %R3 = GETtlsADDR32 %R3, <ga:@sym>
689 // Into: BL_TLS __tls_get_addr(sym@tlsgd)@PLT
691 StringRef Name = "__tls_get_addr";
692 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
693 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
695 if (!Subtarget.isPPC64() && !Subtarget.isDarwin() &&
696 TM.getRelocationModel() == Reloc::PIC_)
697 Kind = MCSymbolRefExpr::VK_PLT;
698 const MCSymbolRefExpr *TlsRef =
699 MCSymbolRefExpr::Create(TlsGetAddr, Kind, OutContext);
700 const MachineOperand &MO = MI->getOperand(2);
701 const GlobalValue *GValue = MO.getGlobal();
702 MCSymbol *MOSymbol = getSymbol(GValue);
703 const MCExpr *SymVar =
704 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSGD,
706 EmitToStreamer(OutStreamer,
707 MCInstBuilder(Subtarget.isPPC64() ?
708 PPC::BL8_NOP_TLS : PPC::BL_TLS)
713 case PPC::ADDIStlsldHA: {
714 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
715 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
716 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
717 const MachineOperand &MO = MI->getOperand(2);
718 const GlobalValue *GValue = MO.getGlobal();
719 MCSymbol *MOSymbol = getSymbol(GValue);
720 const MCExpr *SymGotTlsLD =
721 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
723 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
724 .addReg(MI->getOperand(0).getReg())
726 .addExpr(SymGotTlsLD));
729 case PPC::ADDItlsldL:
730 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
731 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
732 case PPC::ADDItlsldL32: {
733 // Transform: %Rd = ADDItlsldL32 %Rs, <ga:@sym>
734 // Into: %Rd = ADDI %Rs, sym@got@tlsld
735 const MachineOperand &MO = MI->getOperand(2);
736 const GlobalValue *GValue = MO.getGlobal();
737 MCSymbol *MOSymbol = getSymbol(GValue);
738 const MCExpr *SymGotTlsLD =
739 MCSymbolRefExpr::Create(MOSymbol, Subtarget.isPPC64() ?
740 MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO :
741 MCSymbolRefExpr::VK_PPC_GOT_TLSLD,
743 EmitToStreamer(OutStreamer,
744 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
745 .addReg(MI->getOperand(0).getReg())
746 .addReg(MI->getOperand(1).getReg())
747 .addExpr(SymGotTlsLD));
750 case PPC::GETtlsldADDR:
751 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
752 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsld)
753 case PPC::GETtlsldADDR32: {
754 // Transform: %R3 = GETtlsldADDR32 %R3, <ga:@sym>
755 // Into: BL_TLS __tls_get_addr(sym@tlsld)@PLT
757 StringRef Name = "__tls_get_addr";
758 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
759 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
761 if (!Subtarget.isPPC64() && !Subtarget.isDarwin() &&
762 TM.getRelocationModel() == Reloc::PIC_)
763 Kind = MCSymbolRefExpr::VK_PLT;
765 const MCSymbolRefExpr *TlsRef =
766 MCSymbolRefExpr::Create(TlsGetAddr, Kind, OutContext);
767 const MachineOperand &MO = MI->getOperand(2);
768 const GlobalValue *GValue = MO.getGlobal();
769 MCSymbol *MOSymbol = getSymbol(GValue);
770 const MCExpr *SymVar =
771 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSLD,
773 EmitToStreamer(OutStreamer,
774 MCInstBuilder(Subtarget.isPPC64() ?
775 PPC::BL8_NOP_TLS : PPC::BL_TLS)
780 case PPC::ADDISdtprelHA:
781 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
782 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
783 case PPC::ADDISdtprelHA32: {
784 // Transform: %Rd = ADDISdtprelHA32 %R3, <ga:@sym>
785 // Into: %Rd = ADDIS %R3, sym@dtprel@ha
786 const MachineOperand &MO = MI->getOperand(2);
787 const GlobalValue *GValue = MO.getGlobal();
788 MCSymbol *MOSymbol = getSymbol(GValue);
789 const MCExpr *SymDtprel =
790 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
792 EmitToStreamer(OutStreamer,
793 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDIS8 : PPC::ADDIS)
794 .addReg(MI->getOperand(0).getReg())
795 .addReg(Subtarget.isPPC64() ? PPC::X3 : PPC::R3)
796 .addExpr(SymDtprel));
799 case PPC::ADDIdtprelL:
800 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
801 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
802 case PPC::ADDIdtprelL32: {
803 // Transform: %Rd = ADDIdtprelL32 %Rs, <ga:@sym>
804 // Into: %Rd = ADDI %Rs, sym@dtprel@l
805 const MachineOperand &MO = MI->getOperand(2);
806 const GlobalValue *GValue = MO.getGlobal();
807 MCSymbol *MOSymbol = getSymbol(GValue);
808 const MCExpr *SymDtprel =
809 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
811 EmitToStreamer(OutStreamer,
812 MCInstBuilder(Subtarget.isPPC64() ? PPC::ADDI8 : PPC::ADDI)
813 .addReg(MI->getOperand(0).getReg())
814 .addReg(MI->getOperand(1).getReg())
815 .addExpr(SymDtprel));
820 if (!Subtarget.hasMFOCRF()) {
821 // Transform: %R3 = MFOCRF %CR7
822 // Into: %R3 = MFCR ;; cr7
824 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
825 OutStreamer.AddComment(PPCInstPrinter::
826 getRegisterName(MI->getOperand(1).getReg()));
827 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
828 .addReg(MI->getOperand(0).getReg()));
834 if (!Subtarget.hasMFOCRF()) {
835 // Transform: %CR7 = MTOCRF %R3
836 // Into: MTCRF mask, %R3 ;; cr7
838 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
839 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
840 ->getEncodingValue(MI->getOperand(0).getReg());
841 OutStreamer.AddComment(PPCInstPrinter::
842 getRegisterName(MI->getOperand(0).getReg()));
843 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
845 .addReg(MI->getOperand(1).getReg()));
853 // Verify alignment is legal, so we don't create relocations
854 // that can't be supported.
855 // FIXME: This test is currently disabled for Darwin. The test
856 // suite shows a handful of test cases that fail this check for
857 // Darwin. Those need to be investigated before this sanity test
858 // can be enabled for those subtargets.
859 if (!Subtarget.isDarwin()) {
860 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
861 const MachineOperand &MO = MI->getOperand(OpNum);
862 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
863 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
865 // Now process the instruction normally.
870 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
871 EmitToStreamer(OutStreamer, TmpInst);
874 void PPCLinuxAsmPrinter::EmitStartOfAsmFile(Module &M) {
875 if (Subtarget.isELFv2ABI()) {
876 PPCTargetStreamer *TS =
877 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
880 TS->emitAbiVersion(2);
883 if (Subtarget.isPPC64() || TM.getRelocationModel() != Reloc::PIC_)
884 return AsmPrinter::EmitStartOfAsmFile(M);
886 // FIXME: The use of .got2 assumes large GOT model (-fPIC), which is not
887 // optimal for some cases. We should consider supporting small model (-fpic)
888 // as well in the future.
889 assert(TM.getCodeModel() != CodeModel::Small &&
890 "Small code model PIC is currently unsupported.");
891 OutStreamer.SwitchSection(OutContext.getELFSection(".got2",
892 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
893 SectionKind::getReadOnly()));
895 MCSymbol *TOCSym = OutContext.GetOrCreateSymbol(Twine(".L.TOC."));
896 MCSymbol *CurrentPos = OutContext.CreateTempSymbol();
898 OutStreamer.EmitLabel(CurrentPos);
900 // The GOT pointer points to the middle of the GOT, in order to reference the
901 // entire 64kB range. 0x8000 is the midpoint.
902 const MCExpr *tocExpr =
903 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(CurrentPos, OutContext),
904 MCConstantExpr::Create(0x8000, OutContext),
907 OutStreamer.EmitAssignment(TOCSym, tocExpr);
909 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
912 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
913 // linux/ppc32 - Normal entry label.
914 if (!Subtarget.isPPC64() && TM.getRelocationModel() != Reloc::PIC_)
915 return AsmPrinter::EmitFunctionEntryLabel();
917 if (!Subtarget.isPPC64()) {
918 const PPCFunctionInfo *PPCFI = MF->getInfo<PPCFunctionInfo>();
919 if (PPCFI->usesPICBase()) {
920 MCSymbol *RelocSymbol = PPCFI->getPICOffsetSymbol();
921 MCSymbol *PICBase = MF->getPICBaseSymbol();
922 OutStreamer.EmitLabel(RelocSymbol);
924 const MCExpr *OffsExpr =
925 MCBinaryExpr::CreateSub(
926 MCSymbolRefExpr::Create(OutContext.GetOrCreateSymbol(Twine(".L.TOC.")),
928 MCSymbolRefExpr::Create(PICBase, OutContext),
930 OutStreamer.EmitValue(OffsExpr, 4);
931 OutStreamer.EmitLabel(CurrentFnSym);
934 return AsmPrinter::EmitFunctionEntryLabel();
937 // ELFv2 ABI - Normal entry label.
938 if (Subtarget.isELFv2ABI())
939 return AsmPrinter::EmitFunctionEntryLabel();
941 // Emit an official procedure descriptor.
942 MCSectionSubPair Current = OutStreamer.getCurrentSection();
943 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
944 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
945 SectionKind::getReadOnly());
946 OutStreamer.SwitchSection(Section);
947 OutStreamer.EmitLabel(CurrentFnSym);
948 OutStreamer.EmitValueToAlignment(8);
950 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
951 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
953 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
955 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
956 // Generates a R_PPC64_TOC relocation for TOC base insertion.
957 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
958 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
960 // Emit a null environment pointer.
961 OutStreamer.EmitIntValue(0, 8 /* size */);
962 OutStreamer.SwitchSection(Current.first, Current.second);
964 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
965 ".L." + Twine(CurrentFnSym->getName()));
966 OutStreamer.EmitLabel(RealFnSym);
967 CurrentFnSymForSize = RealFnSym;
971 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
972 const DataLayout *TD = TM.getSubtargetImpl()->getDataLayout();
974 bool isPPC64 = TD->getPointerSizeInBits() == 64;
976 PPCTargetStreamer &TS =
977 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
980 const MCSectionELF *Section;
983 Section = OutStreamer.getContext().getELFSection(".toc",
984 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
985 SectionKind::getReadOnly());
987 Section = OutStreamer.getContext().getELFSection(".got2",
988 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
989 SectionKind::getReadOnly());
990 OutStreamer.SwitchSection(Section);
992 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
993 E = TOC.end(); I != E; ++I) {
994 OutStreamer.EmitLabel(I->second);
995 MCSymbol *S = I->first;
999 OutStreamer.EmitSymbolValue(S, 4);
1003 MachineModuleInfoELF &MMIELF =
1004 MMI->getObjFileInfo<MachineModuleInfoELF>();
1006 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
1007 if (!Stubs.empty()) {
1008 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1009 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1011 OutStreamer.EmitLabel(Stubs[i].first);
1013 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
1015 isPPC64 ? 8 : 4/*size*/);
1019 OutStreamer.AddBlankLine();
1022 return AsmPrinter::doFinalization(M);
1025 /// EmitFunctionBodyStart - Emit a global entry point prefix for ELFv2.
1026 void PPCLinuxAsmPrinter::EmitFunctionBodyStart() {
1027 // In the ELFv2 ABI, in functions that use the TOC register, we need to
1028 // provide two entry points. The ABI guarantees that when calling the
1029 // local entry point, r2 is set up by the caller to contain the TOC base
1030 // for this function, and when calling the global entry point, r12 is set
1031 // up by the caller to hold the address of the global entry point. We
1032 // thus emit a prefix sequence along the following lines:
1035 // # global entry point
1036 // addis r2,r12,(.TOC.-func)@ha
1037 // addi r2,r2,(.TOC.-func)@l
1038 // .localentry func, .-func
1039 // # local entry point, followed by function body
1041 // This ensures we have r2 set up correctly while executing the function
1042 // body, no matter which entry point is called.
1043 if (Subtarget.isELFv2ABI()
1044 // Only do all that if the function uses r2 in the first place.
1045 && !MF->getRegInfo().use_empty(PPC::X2)) {
1047 MCSymbol *GlobalEntryLabel = OutContext.CreateTempSymbol();
1048 OutStreamer.EmitLabel(GlobalEntryLabel);
1049 const MCSymbolRefExpr *GlobalEntryLabelExp =
1050 MCSymbolRefExpr::Create(GlobalEntryLabel, OutContext);
1052 MCSymbol *TOCSymbol = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
1053 const MCExpr *TOCDeltaExpr =
1054 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(TOCSymbol, OutContext),
1055 GlobalEntryLabelExp, OutContext);
1057 const MCExpr *TOCDeltaHi =
1058 PPCMCExpr::CreateHa(TOCDeltaExpr, false, OutContext);
1059 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1062 .addExpr(TOCDeltaHi));
1064 const MCExpr *TOCDeltaLo =
1065 PPCMCExpr::CreateLo(TOCDeltaExpr, false, OutContext);
1066 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI)
1069 .addExpr(TOCDeltaLo));
1071 MCSymbol *LocalEntryLabel = OutContext.CreateTempSymbol();
1072 OutStreamer.EmitLabel(LocalEntryLabel);
1073 const MCSymbolRefExpr *LocalEntryLabelExp =
1074 MCSymbolRefExpr::Create(LocalEntryLabel, OutContext);
1075 const MCExpr *LocalOffsetExp =
1076 MCBinaryExpr::CreateSub(LocalEntryLabelExp,
1077 GlobalEntryLabelExp, OutContext);
1079 PPCTargetStreamer *TS =
1080 static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1083 TS->emitLocalEntry(CurrentFnSym, LocalOffsetExp);
1087 /// EmitFunctionBodyEnd - Print the traceback table before the .size
1090 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
1091 // Only the 64-bit target requires a traceback table. For now,
1092 // we only emit the word of zeroes that GDB requires to find
1093 // the end of the function, and zeroes for the eight-byte
1094 // mandatory fields.
1095 // FIXME: We should fill in the eight-byte mandatory fields as described in
1096 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
1097 // currently make use of these fields).
1098 if (Subtarget.isPPC64()) {
1099 OutStreamer.EmitIntValue(0, 4/*size*/);
1100 OutStreamer.EmitIntValue(0, 8/*size*/);
1104 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
1105 static const char *const CPUDirectives[] = {
1129 unsigned Directive = Subtarget.getDarwinDirective();
1130 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
1131 Directive = PPC::DIR_970;
1132 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
1133 Directive = PPC::DIR_7400;
1134 if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
1135 Directive = PPC::DIR_64;
1136 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
1138 assert(Directive < array_lengthof(CPUDirectives) &&
1139 "CPUDirectives[] might not be up-to-date!");
1140 PPCTargetStreamer &TStreamer =
1141 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
1142 TStreamer.emitMachine(CPUDirectives[Directive]);
1144 // Prime text sections so they are adjacent. This reduces the likelihood a
1145 // large data or debug section causes a branch to exceed 16M limit.
1146 const TargetLoweringObjectFileMachO &TLOFMacho =
1147 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1148 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
1149 if (TM.getRelocationModel() == Reloc::PIC_) {
1150 OutStreamer.SwitchSection(
1151 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1152 MachO::S_SYMBOL_STUBS |
1153 MachO::S_ATTR_PURE_INSTRUCTIONS,
1154 32, SectionKind::getText()));
1155 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
1156 OutStreamer.SwitchSection(
1157 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1158 MachO::S_SYMBOL_STUBS |
1159 MachO::S_ATTR_PURE_INSTRUCTIONS,
1160 16, SectionKind::getText()));
1162 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
1165 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
1166 // Remove $stub suffix, add $lazy_ptr.
1167 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
1168 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
1171 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
1172 // Add $tmp suffix to $stub, yielding $stub$tmp.
1173 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
1176 void PPCDarwinAsmPrinter::
1177 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
1179 TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64;
1180 bool isDarwin = Subtarget.isDarwin();
1182 const TargetLoweringObjectFileMachO &TLOFMacho =
1183 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1185 // .lazy_symbol_pointer
1186 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
1188 // Output stubs for dynamically-linked functions
1189 if (TM.getRelocationModel() == Reloc::PIC_) {
1190 const MCSection *StubSection =
1191 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
1192 MachO::S_SYMBOL_STUBS |
1193 MachO::S_ATTR_PURE_INSTRUCTIONS,
1194 32, SectionKind::getText());
1195 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1196 OutStreamer.SwitchSection(StubSection);
1199 MCSymbol *Stub = Stubs[i].first;
1200 MCSymbol *RawSym = Stubs[i].second.getPointer();
1201 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1202 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
1204 OutStreamer.EmitLabel(Stub);
1205 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1207 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
1208 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1210 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
1213 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
1214 // bcl 20, 31, AnonSymbol
1215 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
1216 OutStreamer.EmitLabel(AnonSymbol);
1218 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
1219 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
1220 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
1221 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
1226 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
1228 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
1229 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
1230 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
1231 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1233 .addExpr(SubLo16).addExpr(SubLo16)
1236 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1238 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1240 OutStreamer.SwitchSection(LSPSection);
1241 OutStreamer.EmitLabel(LazyPtr);
1242 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1244 MCSymbol *DyldStubBindingHelper =
1245 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1247 // .quad dyld_stub_binding_helper
1248 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1250 // .long dyld_stub_binding_helper
1251 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1254 OutStreamer.AddBlankLine();
1258 const MCSection *StubSection =
1259 OutContext.getMachOSection("__TEXT","__symbol_stub1",
1260 MachO::S_SYMBOL_STUBS |
1261 MachO::S_ATTR_PURE_INSTRUCTIONS,
1262 16, SectionKind::getText());
1263 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1264 MCSymbol *Stub = Stubs[i].first;
1265 MCSymbol *RawSym = Stubs[i].second.getPointer();
1266 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
1267 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
1269 OutStreamer.SwitchSection(StubSection);
1271 OutStreamer.EmitLabel(Stub);
1272 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1274 // lis r11, ha16(LazyPtr)
1275 const MCExpr *LazyPtrHa16 =
1276 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
1277 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
1279 .addExpr(LazyPtrHa16));
1281 // ldu r12, lo16(LazyPtr)(r11)
1282 // lwzu r12, lo16(LazyPtr)(r11)
1283 const MCExpr *LazyPtrLo16 =
1284 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
1285 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
1287 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1291 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1293 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1295 OutStreamer.SwitchSection(LSPSection);
1296 OutStreamer.EmitLabel(LazyPtr);
1297 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1299 MCSymbol *DyldStubBindingHelper =
1300 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1302 // .quad dyld_stub_binding_helper
1303 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1305 // .long dyld_stub_binding_helper
1306 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1310 OutStreamer.AddBlankLine();
1314 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1316 TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits() == 64;
1318 // Darwin/PPC always uses mach-o.
1319 const TargetLoweringObjectFileMachO &TLOFMacho =
1320 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1321 MachineModuleInfoMachO &MMIMacho =
1322 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1324 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1326 EmitFunctionStubs(Stubs);
1328 if (MAI->doesSupportExceptionHandling() && MMI) {
1329 // Add the (possibly multiple) personalities to the set of global values.
1330 // Only referenced functions get into the Personalities list.
1331 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1332 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1333 E = Personalities.end(); I != E; ++I) {
1335 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1336 MachineModuleInfoImpl::StubValueTy &StubSym =
1337 MMIMacho.getGVStubEntry(NLPSym);
1338 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1343 // Output stubs for dynamically-linked functions.
1344 Stubs = MMIMacho.GetGVStubList();
1346 // Output macho stubs for external and common global variables.
1347 if (!Stubs.empty()) {
1348 // Switch with ".non_lazy_symbol_pointer" directive.
1349 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1350 EmitAlignment(isPPC64 ? 3 : 2);
1352 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1354 OutStreamer.EmitLabel(Stubs[i].first);
1355 // .indirect_symbol _foo
1356 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1357 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1360 // External to current translation unit.
1361 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1363 // Internal to current translation unit.
1365 // When we place the LSDA into the TEXT section, the type info pointers
1366 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1367 // However, sometimes the types are local to the file. So we need to
1368 // fill in the value for the NLP in those cases.
1369 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1371 isPPC64 ? 8 : 4/*size*/);
1375 OutStreamer.AddBlankLine();
1378 Stubs = MMIMacho.GetHiddenGVStubList();
1379 if (!Stubs.empty()) {
1380 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1381 EmitAlignment(isPPC64 ? 3 : 2);
1383 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1385 OutStreamer.EmitLabel(Stubs[i].first);
1387 OutStreamer.EmitValue(MCSymbolRefExpr::
1388 Create(Stubs[i].second.getPointer(),
1390 isPPC64 ? 8 : 4/*size*/);
1394 OutStreamer.AddBlankLine();
1397 // Funny Darwin hack: This flag tells the linker that no global symbols
1398 // contain code that falls through to other global symbols (e.g. the obvious
1399 // implementation of multiple entry points). If this doesn't occur, the
1400 // linker can safely perform dead code stripping. Since LLVM never generates
1401 // code that does this, it is always safe to set.
1402 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1404 return AsmPrinter::doFinalization(M);
1407 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1408 /// for a MachineFunction to the given output stream, in a format that the
1409 /// Darwin assembler can deal with.
1411 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1412 MCStreamer &Streamer) {
1413 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1415 if (Subtarget->isDarwin())
1416 return new PPCDarwinAsmPrinter(tm, Streamer);
1417 return new PPCLinuxAsmPrinter(tm, Streamer);
1420 // Force static initialization.
1421 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1422 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1423 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1424 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);