1 //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to PowerPC assembly language. This printer is
12 // the output mechanism used by `llc'.
14 // Documentation at http://developer.apple.com/documentation/DeveloperTools/
15 // Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
17 //===----------------------------------------------------------------------===//
20 #include "InstPrinter/PPCInstPrinter.h"
21 #include "MCTargetDesc/PPCMCExpr.h"
22 #include "MCTargetDesc/PPCPredicates.h"
23 #include "PPCSubtarget.h"
24 #include "PPCTargetMachine.h"
25 #include "PPCTargetStreamer.h"
26 #include "llvm/ADT/MapVector.h"
27 #include "llvm/ADT/SmallString.h"
28 #include "llvm/ADT/StringExtras.h"
29 #include "llvm/CodeGen/AsmPrinter.h"
30 #include "llvm/CodeGen/MachineFunctionPass.h"
31 #include "llvm/CodeGen/MachineInstr.h"
32 #include "llvm/CodeGen/MachineInstrBuilder.h"
33 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
34 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
35 #include "llvm/IR/Constants.h"
36 #include "llvm/IR/DebugInfo.h"
37 #include "llvm/IR/DerivedTypes.h"
38 #include "llvm/IR/Mangler.h"
39 #include "llvm/IR/Module.h"
40 #include "llvm/MC/MCAsmInfo.h"
41 #include "llvm/MC/MCContext.h"
42 #include "llvm/MC/MCExpr.h"
43 #include "llvm/MC/MCInst.h"
44 #include "llvm/MC/MCInstBuilder.h"
45 #include "llvm/MC/MCSectionELF.h"
46 #include "llvm/MC/MCSectionMachO.h"
47 #include "llvm/MC/MCStreamer.h"
48 #include "llvm/MC/MCSymbol.h"
49 #include "llvm/Support/CommandLine.h"
50 #include "llvm/Support/Debug.h"
51 #include "llvm/Support/ELF.h"
52 #include "llvm/Support/ErrorHandling.h"
53 #include "llvm/Support/MathExtras.h"
54 #include "llvm/Support/TargetRegistry.h"
55 #include "llvm/Support/raw_ostream.h"
56 #include "llvm/Target/TargetInstrInfo.h"
57 #include "llvm/Target/TargetOptions.h"
58 #include "llvm/Target/TargetRegisterInfo.h"
61 #define DEBUG_TYPE "asmprinter"
64 class PPCAsmPrinter : public AsmPrinter {
66 MapVector<MCSymbol*, MCSymbol*> TOC;
67 const PPCSubtarget &Subtarget;
70 explicit PPCAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
71 : AsmPrinter(TM, Streamer),
72 Subtarget(TM.getSubtarget<PPCSubtarget>()), TOCLabelID(0) {}
74 const char *getPassName() const override {
75 return "PowerPC Assembly Printer";
78 MCSymbol *lookUpOrCreateTOCEntry(MCSymbol *Sym);
80 void EmitInstruction(const MachineInstr *MI) override;
82 void printOperand(const MachineInstr *MI, unsigned OpNo, raw_ostream &O);
84 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
85 unsigned AsmVariant, const char *ExtraCode,
86 raw_ostream &O) override;
87 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
88 unsigned AsmVariant, const char *ExtraCode,
89 raw_ostream &O) override;
92 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
93 class PPCLinuxAsmPrinter : public PPCAsmPrinter {
95 explicit PPCLinuxAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
96 : PPCAsmPrinter(TM, Streamer) {}
98 const char *getPassName() const override {
99 return "Linux PPC Assembly Printer";
102 bool doFinalization(Module &M) override;
104 void EmitFunctionEntryLabel() override;
106 void EmitFunctionBodyEnd() override;
109 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
111 class PPCDarwinAsmPrinter : public PPCAsmPrinter {
113 explicit PPCDarwinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
114 : PPCAsmPrinter(TM, Streamer) {}
116 const char *getPassName() const override {
117 return "Darwin PPC Assembly Printer";
120 bool doFinalization(Module &M) override;
121 void EmitStartOfAsmFile(Module &M) override;
123 void EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs);
125 } // end of anonymous namespace
127 /// stripRegisterPrefix - This method strips the character prefix from a
128 /// register name so that only the number is left. Used by for linux asm.
129 static const char *stripRegisterPrefix(const char *RegName) {
130 switch (RegName[0]) {
134 if (RegName[1] == 's')
137 case 'c': if (RegName[1] == 'r') return RegName + 2;
143 void PPCAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
145 const DataLayout *DL = TM.getDataLayout();
146 const MachineOperand &MO = MI->getOperand(OpNo);
148 switch (MO.getType()) {
149 case MachineOperand::MO_Register: {
150 const char *RegName = PPCInstPrinter::getRegisterName(MO.getReg());
151 // Linux assembler (Others?) does not take register mnemonics.
152 // FIXME - What about special registers used in mfspr/mtspr?
153 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
157 case MachineOperand::MO_Immediate:
161 case MachineOperand::MO_MachineBasicBlock:
162 O << *MO.getMBB()->getSymbol();
164 case MachineOperand::MO_ConstantPoolIndex:
165 O << DL->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
166 << '_' << MO.getIndex();
168 case MachineOperand::MO_BlockAddress:
169 O << *GetBlockAddressSymbol(MO.getBlockAddress());
171 case MachineOperand::MO_GlobalAddress: {
172 // Computing the address of a global symbol, not calling it.
173 const GlobalValue *GV = MO.getGlobal();
174 MCSymbol *SymToPrint;
176 // External or weakly linked global variables need non-lazily-resolved stubs
177 if (TM.getRelocationModel() != Reloc::Static &&
178 (GV->isDeclaration() || GV->isWeakForLinker())) {
179 if (!GV->hasHiddenVisibility()) {
180 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
181 MachineModuleInfoImpl::StubValueTy &StubSym =
182 MMI->getObjFileInfo<MachineModuleInfoMachO>()
183 .getGVStubEntry(SymToPrint);
184 if (!StubSym.getPointer())
185 StubSym = MachineModuleInfoImpl::
186 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
187 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
188 GV->hasAvailableExternallyLinkage()) {
189 SymToPrint = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr");
191 MachineModuleInfoImpl::StubValueTy &StubSym =
192 MMI->getObjFileInfo<MachineModuleInfoMachO>().
193 getHiddenGVStubEntry(SymToPrint);
194 if (!StubSym.getPointer())
195 StubSym = MachineModuleInfoImpl::
196 StubValueTy(getSymbol(GV), !GV->hasInternalLinkage());
198 SymToPrint = getSymbol(GV);
201 SymToPrint = getSymbol(GV);
206 printOffset(MO.getOffset(), O);
211 O << "<unknown operand type: " << (unsigned)MO.getType() << ">";
216 /// PrintAsmOperand - Print out an operand for an inline asm expression.
218 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
220 const char *ExtraCode, raw_ostream &O) {
221 // Does this asm operand have a single letter operand modifier?
222 if (ExtraCode && ExtraCode[0]) {
223 if (ExtraCode[1] != 0) return true; // Unknown modifier.
225 switch (ExtraCode[0]) {
227 // See if this is a generic print operand
228 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
229 case 'c': // Don't print "$" before a global var name or constant.
230 break; // PPC never has a prefix.
231 case 'L': // Write second word of DImode reference.
232 // Verify that this operand has two consecutive registers.
233 if (!MI->getOperand(OpNo).isReg() ||
234 OpNo+1 == MI->getNumOperands() ||
235 !MI->getOperand(OpNo+1).isReg())
237 ++OpNo; // Return the high-part.
240 // Write 'i' if an integer constant, otherwise nothing. Used to print
242 if (MI->getOperand(OpNo).isImm())
248 printOperand(MI, OpNo, O);
252 // At the moment, all inline asm memory operands are a single register.
253 // In any case, the output of this routine should always be just one
254 // assembler operand.
256 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
258 const char *ExtraCode,
260 if (ExtraCode && ExtraCode[0]) {
261 if (ExtraCode[1] != 0) return true; // Unknown modifier.
263 switch (ExtraCode[0]) {
264 default: return true; // Unknown modifier.
265 case 'y': // A memory reference for an X-form instruction
267 const char *RegName = "r0";
268 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
269 O << RegName << ", ";
270 printOperand(MI, OpNo, O);
276 assert(MI->getOperand(OpNo).isReg());
278 printOperand(MI, OpNo, O);
284 /// lookUpOrCreateTOCEntry -- Given a symbol, look up whether a TOC entry
285 /// exists for it. If not, create one. Then return a symbol that references
287 MCSymbol *PPCAsmPrinter::lookUpOrCreateTOCEntry(MCSymbol *Sym) {
288 const DataLayout *DL = TM.getDataLayout();
289 MCSymbol *&TOCEntry = TOC[Sym];
291 // To avoid name clash check if the name already exists.
293 if (OutContext.LookupSymbol(Twine(DL->getPrivateGlobalPrefix()) +
294 "C" + Twine(TOCLabelID++)) == nullptr) {
295 TOCEntry = GetTempSymbol("C", TOCLabelID);
303 /// EmitInstruction -- Print out a single PowerPC MI in Darwin syntax to
304 /// the current output stream.
306 void PPCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
308 bool isPPC64 = Subtarget.isPPC64();
310 // Lower multi-instruction pseudo operations.
311 switch (MI->getOpcode()) {
313 case TargetOpcode::DBG_VALUE:
314 llvm_unreachable("Should be handled target independently");
315 case PPC::MovePCtoLR:
316 case PPC::MovePCtoLR8: {
317 // Transform %LR = MovePCtoLR
318 // Into this, where the label is the PIC base:
321 MCSymbol *PICBase = MF->getPICBaseSymbol();
324 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL)
325 // FIXME: We would like an efficient form for this, so we don't have to do
326 // a lot of extra uniquing.
327 .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
330 OutStreamer.EmitLabel(PICBase);
336 // Transform %X3 = LDtoc <ga:@min1>, %X2
337 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
339 // Change the opcode to LD, and the global address operand to be a
340 // reference to the TOC entry we will synthesize later.
341 TmpInst.setOpcode(PPC::LD);
342 const MachineOperand &MO = MI->getOperand(1);
344 // Map symbol -> label of TOC entry
345 assert(MO.isGlobal() || MO.isCPI() || MO.isJTI());
346 MCSymbol *MOSymbol = nullptr;
348 MOSymbol = getSymbol(MO.getGlobal());
350 MOSymbol = GetCPISymbol(MO.getIndex());
352 MOSymbol = GetJTISymbol(MO.getIndex());
354 MCSymbol *TOCEntry = lookUpOrCreateTOCEntry(MOSymbol);
357 MCSymbolRefExpr::Create(TOCEntry, MCSymbolRefExpr::VK_PPC_TOC,
359 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
360 EmitToStreamer(OutStreamer, TmpInst);
364 case PPC::ADDIStocHA: {
365 // Transform %Xd = ADDIStocHA %X2, <ga:@sym>
366 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
368 // Change the opcode to ADDIS8. If the global address is external, has
369 // common linkage, is a non-local function address, or is a jump table
370 // address, then generate a TOC entry and reference that. Otherwise
371 // reference the symbol directly.
372 TmpInst.setOpcode(PPC::ADDIS8);
373 const MachineOperand &MO = MI->getOperand(2);
374 assert((MO.isGlobal() || MO.isCPI() || MO.isJTI()) &&
375 "Invalid operand for ADDIStocHA!");
376 MCSymbol *MOSymbol = nullptr;
377 bool IsExternal = false;
378 bool IsNonLocalFunction = false;
379 bool IsCommon = false;
380 bool IsAvailExt = false;
383 const GlobalValue *GV = MO.getGlobal();
384 MOSymbol = getSymbol(GV);
385 IsExternal = GV->isDeclaration();
386 IsCommon = GV->hasCommonLinkage();
387 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
388 (GV->isDeclaration() || GV->isWeakForLinker());
389 IsAvailExt = GV->hasAvailableExternallyLinkage();
390 } else if (MO.isCPI())
391 MOSymbol = GetCPISymbol(MO.getIndex());
393 MOSymbol = GetJTISymbol(MO.getIndex());
395 if (IsExternal || IsNonLocalFunction || IsCommon || IsAvailExt ||
396 MO.isJTI() || TM.getCodeModel() == CodeModel::Large)
397 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
400 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_HA,
402 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
403 EmitToStreamer(OutStreamer, TmpInst);
407 // Transform %Xd = LDtocL <ga:@sym>, %Xs
408 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
410 // Change the opcode to LD. If the global address is external, has
411 // common linkage, or is a jump table address, then reference the
412 // associated TOC entry. Otherwise reference the symbol directly.
413 TmpInst.setOpcode(PPC::LD);
414 const MachineOperand &MO = MI->getOperand(1);
415 assert((MO.isGlobal() || MO.isJTI() || MO.isCPI()) &&
416 "Invalid operand for LDtocL!");
417 MCSymbol *MOSymbol = nullptr;
420 MOSymbol = lookUpOrCreateTOCEntry(GetJTISymbol(MO.getIndex()));
421 else if (MO.isCPI()) {
422 MOSymbol = GetCPISymbol(MO.getIndex());
423 if (TM.getCodeModel() == CodeModel::Large)
424 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
426 else if (MO.isGlobal()) {
427 const GlobalValue *GValue = MO.getGlobal();
428 MOSymbol = getSymbol(GValue);
429 if (GValue->getType()->getElementType()->isFunctionTy() ||
430 GValue->isDeclaration() || GValue->hasCommonLinkage() ||
431 GValue->hasAvailableExternallyLinkage() ||
432 TM.getCodeModel() == CodeModel::Large)
433 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
437 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
439 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
440 EmitToStreamer(OutStreamer, TmpInst);
443 case PPC::ADDItocL: {
444 // Transform %Xd = ADDItocL %Xs, <ga:@sym>
445 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
447 // Change the opcode to ADDI8. If the global address is external, then
448 // generate a TOC entry and reference that. Otherwise reference the
450 TmpInst.setOpcode(PPC::ADDI8);
451 const MachineOperand &MO = MI->getOperand(2);
452 assert((MO.isGlobal() || MO.isCPI()) && "Invalid operand for ADDItocL");
453 MCSymbol *MOSymbol = nullptr;
454 bool IsExternal = false;
455 bool IsNonLocalFunction = false;
458 const GlobalValue *GV = MO.getGlobal();
459 MOSymbol = getSymbol(GV);
460 IsExternal = GV->isDeclaration();
461 IsNonLocalFunction = GV->getType()->getElementType()->isFunctionTy() &&
462 (GV->isDeclaration() || GV->isWeakForLinker());
463 } else if (MO.isCPI())
464 MOSymbol = GetCPISymbol(MO.getIndex());
466 if (IsNonLocalFunction || IsExternal ||
467 TM.getCodeModel() == CodeModel::Large)
468 MOSymbol = lookUpOrCreateTOCEntry(MOSymbol);
471 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TOC_LO,
473 TmpInst.getOperand(2) = MCOperand::CreateExpr(Exp);
474 EmitToStreamer(OutStreamer, TmpInst);
477 case PPC::ADDISgotTprelHA: {
478 // Transform: %Xd = ADDISgotTprelHA %X2, <ga:@sym>
479 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
480 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
481 const MachineOperand &MO = MI->getOperand(2);
482 const GlobalValue *GValue = MO.getGlobal();
483 MCSymbol *MOSymbol = getSymbol(GValue);
484 const MCExpr *SymGotTprel =
485 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA,
487 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
488 .addReg(MI->getOperand(0).getReg())
490 .addExpr(SymGotTprel));
493 case PPC::LDgotTprelL:
494 case PPC::LDgotTprelL32: {
495 // Transform %Xd = LDgotTprelL <ga:@sym>, %Xs
496 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
498 // Change the opcode to LD.
499 TmpInst.setOpcode(isPPC64 ? PPC::LD : PPC::LWZ);
500 const MachineOperand &MO = MI->getOperand(1);
501 const GlobalValue *GValue = MO.getGlobal();
502 MCSymbol *MOSymbol = getSymbol(GValue);
504 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO,
506 TmpInst.getOperand(1) = MCOperand::CreateExpr(Exp);
507 EmitToStreamer(OutStreamer, TmpInst);
511 case PPC::PPC32GOT: {
512 MCSymbol *GOTSymbol = OutContext.GetOrCreateSymbol(StringRef("_GLOBAL_OFFSET_TABLE_"));
513 const MCExpr *SymGotTlsL =
514 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_LO,
516 const MCExpr *SymGotTlsHA =
517 MCSymbolRefExpr::Create(GOTSymbol, MCSymbolRefExpr::VK_PPC_HA,
519 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LI)
520 .addReg(MI->getOperand(0).getReg())
521 .addExpr(SymGotTlsL));
522 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
523 .addReg(MI->getOperand(0).getReg())
524 .addReg(MI->getOperand(0).getReg())
525 .addExpr(SymGotTlsHA));
528 case PPC::ADDIStlsgdHA: {
529 // Transform: %Xd = ADDIStlsgdHA %X2, <ga:@sym>
530 // Into: %Xd = ADDIS8 %X2, sym@got@tlsgd@ha
531 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
532 const MachineOperand &MO = MI->getOperand(2);
533 const GlobalValue *GValue = MO.getGlobal();
534 MCSymbol *MOSymbol = getSymbol(GValue);
535 const MCExpr *SymGotTlsGD =
536 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA,
538 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
539 .addReg(MI->getOperand(0).getReg())
541 .addExpr(SymGotTlsGD));
544 case PPC::ADDItlsgdL: {
545 // Transform: %Xd = ADDItlsgdL %Xs, <ga:@sym>
546 // Into: %Xd = ADDI8 %Xs, sym@got@tlsgd@l
547 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
548 const MachineOperand &MO = MI->getOperand(2);
549 const GlobalValue *GValue = MO.getGlobal();
550 MCSymbol *MOSymbol = getSymbol(GValue);
551 const MCExpr *SymGotTlsGD =
552 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO,
554 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI8)
555 .addReg(MI->getOperand(0).getReg())
556 .addReg(MI->getOperand(1).getReg())
557 .addExpr(SymGotTlsGD));
560 case PPC::GETtlsADDR: {
561 // Transform: %X3 = GETtlsADDR %X3, <ga:@sym>
562 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsgd)
563 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
565 StringRef Name = "__tls_get_addr";
566 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
567 const MCSymbolRefExpr *TlsRef =
568 MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
569 const MachineOperand &MO = MI->getOperand(2);
570 const GlobalValue *GValue = MO.getGlobal();
571 MCSymbol *MOSymbol = getSymbol(GValue);
572 const MCExpr *SymVar =
573 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSGD,
575 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL8_NOP_TLS)
580 case PPC::ADDIStlsldHA: {
581 // Transform: %Xd = ADDIStlsldHA %X2, <ga:@sym>
582 // Into: %Xd = ADDIS8 %X2, sym@got@tlsld@ha
583 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
584 const MachineOperand &MO = MI->getOperand(2);
585 const GlobalValue *GValue = MO.getGlobal();
586 MCSymbol *MOSymbol = getSymbol(GValue);
587 const MCExpr *SymGotTlsLD =
588 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA,
590 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
591 .addReg(MI->getOperand(0).getReg())
593 .addExpr(SymGotTlsLD));
596 case PPC::ADDItlsldL: {
597 // Transform: %Xd = ADDItlsldL %Xs, <ga:@sym>
598 // Into: %Xd = ADDI8 %Xs, sym@got@tlsld@l
599 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
600 const MachineOperand &MO = MI->getOperand(2);
601 const GlobalValue *GValue = MO.getGlobal();
602 MCSymbol *MOSymbol = getSymbol(GValue);
603 const MCExpr *SymGotTlsLD =
604 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO,
606 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI8)
607 .addReg(MI->getOperand(0).getReg())
608 .addReg(MI->getOperand(1).getReg())
609 .addExpr(SymGotTlsLD));
612 case PPC::GETtlsldADDR: {
613 // Transform: %X3 = GETtlsldADDR %X3, <ga:@sym>
614 // Into: BL8_NOP_TLS __tls_get_addr(sym@tlsld)
615 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
617 StringRef Name = "__tls_get_addr";
618 MCSymbol *TlsGetAddr = OutContext.GetOrCreateSymbol(Name);
619 const MCSymbolRefExpr *TlsRef =
620 MCSymbolRefExpr::Create(TlsGetAddr, MCSymbolRefExpr::VK_None, OutContext);
621 const MachineOperand &MO = MI->getOperand(2);
622 const GlobalValue *GValue = MO.getGlobal();
623 MCSymbol *MOSymbol = getSymbol(GValue);
624 const MCExpr *SymVar =
625 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_TLSLD,
627 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BL8_NOP_TLS)
632 case PPC::ADDISdtprelHA: {
633 // Transform: %Xd = ADDISdtprelHA %X3, <ga:@sym>
634 // Into: %Xd = ADDIS8 %X3, sym@dtprel@ha
635 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
636 const MachineOperand &MO = MI->getOperand(2);
637 const GlobalValue *GValue = MO.getGlobal();
638 MCSymbol *MOSymbol = getSymbol(GValue);
639 const MCExpr *SymDtprel =
640 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_HA,
642 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS8)
643 .addReg(MI->getOperand(0).getReg())
645 .addExpr(SymDtprel));
648 case PPC::ADDIdtprelL: {
649 // Transform: %Xd = ADDIdtprelL %Xs, <ga:@sym>
650 // Into: %Xd = ADDI8 %Xs, sym@dtprel@l
651 assert(Subtarget.isPPC64() && "Not supported for 32-bit PowerPC");
652 const MachineOperand &MO = MI->getOperand(2);
653 const GlobalValue *GValue = MO.getGlobal();
654 MCSymbol *MOSymbol = getSymbol(GValue);
655 const MCExpr *SymDtprel =
656 MCSymbolRefExpr::Create(MOSymbol, MCSymbolRefExpr::VK_PPC_DTPREL_LO,
658 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDI8)
659 .addReg(MI->getOperand(0).getReg())
660 .addReg(MI->getOperand(1).getReg())
661 .addExpr(SymDtprel));
666 if (!Subtarget.hasMFOCRF()) {
667 // Transform: %R3 = MFOCRF %CR7
668 // Into: %R3 = MFCR ;; cr7
670 MI->getOpcode() == PPC::MFOCRF ? PPC::MFCR : PPC::MFCR8;
671 OutStreamer.AddComment(PPCInstPrinter::
672 getRegisterName(MI->getOperand(1).getReg()));
673 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
674 .addReg(MI->getOperand(0).getReg()));
680 if (!Subtarget.hasMFOCRF()) {
681 // Transform: %CR7 = MTOCRF %R3
682 // Into: MTCRF mask, %R3 ;; cr7
684 MI->getOpcode() == PPC::MTOCRF ? PPC::MTCRF : PPC::MTCRF8;
685 unsigned Mask = 0x80 >> OutContext.getRegisterInfo()
686 ->getEncodingValue(MI->getOperand(0).getReg());
687 OutStreamer.AddComment(PPCInstPrinter::
688 getRegisterName(MI->getOperand(0).getReg()));
689 EmitToStreamer(OutStreamer, MCInstBuilder(NewOpcode)
691 .addReg(MI->getOperand(1).getReg()));
699 // Verify alignment is legal, so we don't create relocations
700 // that can't be supported.
701 // FIXME: This test is currently disabled for Darwin. The test
702 // suite shows a handful of test cases that fail this check for
703 // Darwin. Those need to be investigated before this sanity test
704 // can be enabled for those subtargets.
705 if (!Subtarget.isDarwin()) {
706 unsigned OpNum = (MI->getOpcode() == PPC::STD) ? 2 : 1;
707 const MachineOperand &MO = MI->getOperand(OpNum);
708 if (MO.isGlobal() && MO.getGlobal()->getAlignment() < 4)
709 llvm_unreachable("Global must be word-aligned for LD, STD, LWA!");
711 // Now process the instruction normally.
716 LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, Subtarget.isDarwin());
717 EmitToStreamer(OutStreamer, TmpInst);
720 void PPCLinuxAsmPrinter::EmitFunctionEntryLabel() {
721 if (!Subtarget.isPPC64()) // linux/ppc32 - Normal entry label.
722 return AsmPrinter::EmitFunctionEntryLabel();
724 // Emit an official procedure descriptor.
725 MCSectionSubPair Current = OutStreamer.getCurrentSection();
726 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".opd",
727 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
728 SectionKind::getReadOnly());
729 OutStreamer.SwitchSection(Section);
730 OutStreamer.EmitLabel(CurrentFnSym);
731 OutStreamer.EmitValueToAlignment(8);
733 OutContext.GetOrCreateSymbol(".L." + Twine(CurrentFnSym->getName()));
734 // Generates a R_PPC64_ADDR64 (from FK_DATA_8) relocation for the function
736 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol1, OutContext),
738 MCSymbol *Symbol2 = OutContext.GetOrCreateSymbol(StringRef(".TOC."));
739 // Generates a R_PPC64_TOC relocation for TOC base insertion.
740 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Symbol2,
741 MCSymbolRefExpr::VK_PPC_TOCBASE, OutContext),
743 // Emit a null environment pointer.
744 OutStreamer.EmitIntValue(0, 8 /* size */);
745 OutStreamer.SwitchSection(Current.first, Current.second);
747 MCSymbol *RealFnSym = OutContext.GetOrCreateSymbol(
748 ".L." + Twine(CurrentFnSym->getName()));
749 OutStreamer.EmitLabel(RealFnSym);
750 CurrentFnSymForSize = RealFnSym;
754 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
755 const DataLayout *TD = TM.getDataLayout();
757 bool isPPC64 = TD->getPointerSizeInBits() == 64;
759 PPCTargetStreamer &TS =
760 static_cast<PPCTargetStreamer &>(*OutStreamer.getTargetStreamer());
762 if (isPPC64 && !TOC.empty()) {
763 const MCSectionELF *Section = OutStreamer.getContext().getELFSection(".toc",
764 ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC,
765 SectionKind::getReadOnly());
766 OutStreamer.SwitchSection(Section);
768 for (MapVector<MCSymbol*, MCSymbol*>::iterator I = TOC.begin(),
769 E = TOC.end(); I != E; ++I) {
770 OutStreamer.EmitLabel(I->second);
771 MCSymbol *S = OutContext.GetOrCreateSymbol(I->first->getName());
776 MachineModuleInfoELF &MMIELF =
777 MMI->getObjFileInfo<MachineModuleInfoELF>();
779 MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
780 if (!Stubs.empty()) {
781 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
782 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
784 OutStreamer.EmitLabel(Stubs[i].first);
786 OutStreamer.EmitValue(MCSymbolRefExpr::Create(Stubs[i].second.getPointer(),
788 isPPC64 ? 8 : 4/*size*/);
792 OutStreamer.AddBlankLine();
795 return AsmPrinter::doFinalization(M);
798 /// EmitFunctionBodyEnd - Print the traceback table before the .size
801 void PPCLinuxAsmPrinter::EmitFunctionBodyEnd() {
802 // Only the 64-bit target requires a traceback table. For now,
803 // we only emit the word of zeroes that GDB requires to find
804 // the end of the function, and zeroes for the eight-byte
806 // FIXME: We should fill in the eight-byte mandatory fields as described in
807 // the PPC64 ELF ABI (this is a low-priority item because GDB does not
808 // currently make use of these fields).
809 if (Subtarget.isPPC64()) {
810 OutStreamer.EmitIntValue(0, 4/*size*/);
811 OutStreamer.EmitIntValue(0, 8/*size*/);
815 void PPCDarwinAsmPrinter::EmitStartOfAsmFile(Module &M) {
816 static const char *const CPUDirectives[] = {
840 unsigned Directive = Subtarget.getDarwinDirective();
841 if (Subtarget.hasMFOCRF() && Directive < PPC::DIR_970)
842 Directive = PPC::DIR_970;
843 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
844 Directive = PPC::DIR_7400;
845 if (Subtarget.isPPC64() && Directive < PPC::DIR_64)
846 Directive = PPC::DIR_64;
847 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
849 assert(Directive < array_lengthof(CPUDirectives) &&
850 "CPUDirectives[] might not be up-to-date!");
851 PPCTargetStreamer &TStreamer =
852 *static_cast<PPCTargetStreamer *>(OutStreamer.getTargetStreamer());
853 TStreamer.emitMachine(CPUDirectives[Directive]);
855 // Prime text sections so they are adjacent. This reduces the likelihood a
856 // large data or debug section causes a branch to exceed 16M limit.
857 const TargetLoweringObjectFileMachO &TLOFMacho =
858 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
859 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
860 if (TM.getRelocationModel() == Reloc::PIC_) {
861 OutStreamer.SwitchSection(
862 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
863 MachO::S_SYMBOL_STUBS |
864 MachO::S_ATTR_PURE_INSTRUCTIONS,
865 32, SectionKind::getText()));
866 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
867 OutStreamer.SwitchSection(
868 OutContext.getMachOSection("__TEXT","__symbol_stub1",
869 MachO::S_SYMBOL_STUBS |
870 MachO::S_ATTR_PURE_INSTRUCTIONS,
871 16, SectionKind::getText()));
873 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
876 static MCSymbol *GetLazyPtr(MCSymbol *Sym, MCContext &Ctx) {
877 // Remove $stub suffix, add $lazy_ptr.
878 StringRef NoStub = Sym->getName().substr(0, Sym->getName().size()-5);
879 return Ctx.GetOrCreateSymbol(NoStub + "$lazy_ptr");
882 static MCSymbol *GetAnonSym(MCSymbol *Sym, MCContext &Ctx) {
883 // Add $tmp suffix to $stub, yielding $stub$tmp.
884 return Ctx.GetOrCreateSymbol(Sym->getName() + "$tmp");
887 void PPCDarwinAsmPrinter::
888 EmitFunctionStubs(const MachineModuleInfoMachO::SymbolListTy &Stubs) {
889 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
890 bool isDarwin = Subtarget.isDarwin();
892 const TargetLoweringObjectFileMachO &TLOFMacho =
893 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
895 // .lazy_symbol_pointer
896 const MCSection *LSPSection = TLOFMacho.getLazySymbolPointerSection();
898 // Output stubs for dynamically-linked functions
899 if (TM.getRelocationModel() == Reloc::PIC_) {
900 const MCSection *StubSection =
901 OutContext.getMachOSection("__TEXT", "__picsymbolstub1",
902 MachO::S_SYMBOL_STUBS |
903 MachO::S_ATTR_PURE_INSTRUCTIONS,
904 32, SectionKind::getText());
905 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
906 OutStreamer.SwitchSection(StubSection);
909 MCSymbol *Stub = Stubs[i].first;
910 MCSymbol *RawSym = Stubs[i].second.getPointer();
911 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
912 MCSymbol *AnonSymbol = GetAnonSym(Stub, OutContext);
914 OutStreamer.EmitLabel(Stub);
915 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
917 const MCExpr *Anon = MCSymbolRefExpr::Create(AnonSymbol, OutContext);
918 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
920 MCBinaryExpr::CreateSub(LazyPtrExpr, Anon, OutContext);
923 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R0));
924 // bcl 20, 31, AnonSymbol
925 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCLalways).addExpr(Anon));
926 OutStreamer.EmitLabel(AnonSymbol);
928 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MFLR).addReg(PPC::R11));
929 // addis r11, r11, ha16(LazyPtr - AnonSymbol)
930 const MCExpr *SubHa16 = PPCMCExpr::CreateHa(Sub, isDarwin, OutContext);
931 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::ADDIS)
936 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTLR).addReg(PPC::R0));
938 // ldu r12, lo16(LazyPtr - AnonSymbol)(r11)
939 // lwzu r12, lo16(LazyPtr - AnonSymbol)(r11)
940 const MCExpr *SubLo16 = PPCMCExpr::CreateLo(Sub, isDarwin, OutContext);
941 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
943 .addExpr(SubLo16).addExpr(SubLo16)
946 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
948 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
950 OutStreamer.SwitchSection(LSPSection);
951 OutStreamer.EmitLabel(LazyPtr);
952 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
954 MCSymbol *DyldStubBindingHelper =
955 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
957 // .quad dyld_stub_binding_helper
958 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
960 // .long dyld_stub_binding_helper
961 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
964 OutStreamer.AddBlankLine();
968 const MCSection *StubSection =
969 OutContext.getMachOSection("__TEXT","__symbol_stub1",
970 MachO::S_SYMBOL_STUBS |
971 MachO::S_ATTR_PURE_INSTRUCTIONS,
972 16, SectionKind::getText());
973 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
974 MCSymbol *Stub = Stubs[i].first;
975 MCSymbol *RawSym = Stubs[i].second.getPointer();
976 MCSymbol *LazyPtr = GetLazyPtr(Stub, OutContext);
977 const MCExpr *LazyPtrExpr = MCSymbolRefExpr::Create(LazyPtr, OutContext);
979 OutStreamer.SwitchSection(StubSection);
981 OutStreamer.EmitLabel(Stub);
982 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
984 // lis r11, ha16(LazyPtr)
985 const MCExpr *LazyPtrHa16 =
986 PPCMCExpr::CreateHa(LazyPtrExpr, isDarwin, OutContext);
987 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::LIS)
989 .addExpr(LazyPtrHa16));
991 // ldu r12, lo16(LazyPtr)(r11)
992 // lwzu r12, lo16(LazyPtr)(r11)
993 const MCExpr *LazyPtrLo16 =
994 PPCMCExpr::CreateLo(LazyPtrExpr, isDarwin, OutContext);
995 EmitToStreamer(OutStreamer, MCInstBuilder(isPPC64 ? PPC::LDU : PPC::LWZU)
997 .addExpr(LazyPtrLo16).addExpr(LazyPtrLo16)
1001 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::MTCTR).addReg(PPC::R12));
1003 EmitToStreamer(OutStreamer, MCInstBuilder(PPC::BCTR));
1005 OutStreamer.SwitchSection(LSPSection);
1006 OutStreamer.EmitLabel(LazyPtr);
1007 OutStreamer.EmitSymbolAttribute(RawSym, MCSA_IndirectSymbol);
1009 MCSymbol *DyldStubBindingHelper =
1010 OutContext.GetOrCreateSymbol(StringRef("dyld_stub_binding_helper"));
1012 // .quad dyld_stub_binding_helper
1013 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 8);
1015 // .long dyld_stub_binding_helper
1016 OutStreamer.EmitSymbolValue(DyldStubBindingHelper, 4);
1020 OutStreamer.AddBlankLine();
1024 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1025 bool isPPC64 = TM.getDataLayout()->getPointerSizeInBits() == 64;
1027 // Darwin/PPC always uses mach-o.
1028 const TargetLoweringObjectFileMachO &TLOFMacho =
1029 static_cast<const TargetLoweringObjectFileMachO &>(getObjFileLowering());
1030 MachineModuleInfoMachO &MMIMacho =
1031 MMI->getObjFileInfo<MachineModuleInfoMachO>();
1033 MachineModuleInfoMachO::SymbolListTy Stubs = MMIMacho.GetFnStubList();
1035 EmitFunctionStubs(Stubs);
1037 if (MAI->doesSupportExceptionHandling() && MMI) {
1038 // Add the (possibly multiple) personalities to the set of global values.
1039 // Only referenced functions get into the Personalities list.
1040 const std::vector<const Function*> &Personalities = MMI->getPersonalities();
1041 for (std::vector<const Function*>::const_iterator I = Personalities.begin(),
1042 E = Personalities.end(); I != E; ++I) {
1044 MCSymbol *NLPSym = getSymbolWithGlobalValueBase(*I, "$non_lazy_ptr");
1045 MachineModuleInfoImpl::StubValueTy &StubSym =
1046 MMIMacho.getGVStubEntry(NLPSym);
1047 StubSym = MachineModuleInfoImpl::StubValueTy(getSymbol(*I), true);
1052 // Output stubs for dynamically-linked functions.
1053 Stubs = MMIMacho.GetGVStubList();
1055 // Output macho stubs for external and common global variables.
1056 if (!Stubs.empty()) {
1057 // Switch with ".non_lazy_symbol_pointer" directive.
1058 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1059 EmitAlignment(isPPC64 ? 3 : 2);
1061 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1063 OutStreamer.EmitLabel(Stubs[i].first);
1064 // .indirect_symbol _foo
1065 MachineModuleInfoImpl::StubValueTy &MCSym = Stubs[i].second;
1066 OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol);
1069 // External to current translation unit.
1070 OutStreamer.EmitIntValue(0, isPPC64 ? 8 : 4/*size*/);
1072 // Internal to current translation unit.
1074 // When we place the LSDA into the TEXT section, the type info pointers
1075 // need to be indirect and pc-rel. We accomplish this by using NLPs.
1076 // However, sometimes the types are local to the file. So we need to
1077 // fill in the value for the NLP in those cases.
1078 OutStreamer.EmitValue(MCSymbolRefExpr::Create(MCSym.getPointer(),
1080 isPPC64 ? 8 : 4/*size*/);
1084 OutStreamer.AddBlankLine();
1087 Stubs = MMIMacho.GetHiddenGVStubList();
1088 if (!Stubs.empty()) {
1089 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1090 EmitAlignment(isPPC64 ? 3 : 2);
1092 for (unsigned i = 0, e = Stubs.size(); i != e; ++i) {
1094 OutStreamer.EmitLabel(Stubs[i].first);
1096 OutStreamer.EmitValue(MCSymbolRefExpr::
1097 Create(Stubs[i].second.getPointer(),
1099 isPPC64 ? 8 : 4/*size*/);
1103 OutStreamer.AddBlankLine();
1106 // Funny Darwin hack: This flag tells the linker that no global symbols
1107 // contain code that falls through to other global symbols (e.g. the obvious
1108 // implementation of multiple entry points). If this doesn't occur, the
1109 // linker can safely perform dead code stripping. Since LLVM never generates
1110 // code that does this, it is always safe to set.
1111 OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols);
1113 return AsmPrinter::doFinalization(M);
1116 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1117 /// for a MachineFunction to the given output stream, in a format that the
1118 /// Darwin assembler can deal with.
1120 static AsmPrinter *createPPCAsmPrinterPass(TargetMachine &tm,
1121 MCStreamer &Streamer) {
1122 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1124 if (Subtarget->isDarwin())
1125 return new PPCDarwinAsmPrinter(tm, Streamer);
1126 return new PPCLinuxAsmPrinter(tm, Streamer);
1129 // Force static initialization.
1130 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1131 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1132 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);
1133 TargetRegistry::RegisterAsmPrinter(ThePPC64LETarget, createPPCAsmPrinterPass);