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 //===----------------------------------------------------------------------===//
19 #define DEBUG_TYPE "asmprinter"
21 #include "PPCPredicates.h"
22 #include "PPCTargetMachine.h"
23 #include "PPCSubtarget.h"
24 #include "llvm/Constants.h"
25 #include "llvm/DerivedTypes.h"
26 #include "llvm/Module.h"
27 #include "llvm/Assembly/Writer.h"
28 #include "llvm/CodeGen/AsmPrinter.h"
29 #include "llvm/CodeGen/DwarfWriter.h"
30 #include "llvm/CodeGen/MachineModuleInfo.h"
31 #include "llvm/CodeGen/MachineFunctionPass.h"
32 #include "llvm/CodeGen/MachineInstr.h"
33 #include "llvm/CodeGen/MachineInstrBuilder.h"
34 #include "llvm/MC/MCSectionMachO.h"
35 #include "llvm/MC/MCStreamer.h"
36 #include "llvm/MC/MCAsmInfo.h"
37 #include "llvm/Target/TargetLoweringObjectFile.h"
38 #include "llvm/Target/TargetRegisterInfo.h"
39 #include "llvm/Target/TargetInstrInfo.h"
40 #include "llvm/Target/TargetOptions.h"
41 #include "llvm/Target/TargetRegistry.h"
42 #include "llvm/Support/Mangler.h"
43 #include "llvm/Support/MathExtras.h"
44 #include "llvm/Support/CommandLine.h"
45 #include "llvm/Support/Debug.h"
46 #include "llvm/Support/ErrorHandling.h"
47 #include "llvm/Support/Compiler.h"
48 #include "llvm/Support/FormattedStream.h"
49 #include "llvm/ADT/Statistic.h"
50 #include "llvm/ADT/StringExtras.h"
51 #include "llvm/ADT/StringSet.h"
54 STATISTIC(EmittedInsts, "Number of machine instrs printed");
57 class VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter {
60 std::string Stub, LazyPtr, AnonSymbol;
64 void Init(const GlobalValue *GV, Mangler *Mang) {
65 // Already initialized.
66 if (!Stub.empty()) return;
67 Stub = Mang->getMangledName(GV, "$stub", true);
68 LazyPtr = Mang->getMangledName(GV, "$lazy_ptr", true);
69 AnonSymbol = Mang->getMangledName(GV, "$stub$tmp", true);
72 void Init(const std::string &GV, Mangler *Mang) {
73 // Already initialized.
74 if (!Stub.empty()) return;
75 Stub = Mang->makeNameProper(GV + "$stub",
77 LazyPtr = Mang->makeNameProper(GV + "$lazy_ptr",
79 AnonSymbol = Mang->makeNameProper(GV + "$stub$tmp",
84 StringMap<FnStubInfo> FnStubs;
85 StringMap<std::string> GVStubs, HiddenGVStubs, TOC;
86 const PPCSubtarget &Subtarget;
89 explicit PPCAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
90 const MCAsmInfo *T, bool V)
91 : AsmPrinter(O, TM, T, V),
92 Subtarget(TM.getSubtarget<PPCSubtarget>()), LabelID(0) {}
94 virtual const char *getPassName() const {
95 return "PowerPC Assembly Printer";
98 PPCTargetMachine &getTM() {
99 return static_cast<PPCTargetMachine&>(TM);
102 unsigned enumRegToMachineReg(unsigned enumReg) {
104 default: llvm_unreachable("Unhandled register!");
105 case PPC::CR0: return 0;
106 case PPC::CR1: return 1;
107 case PPC::CR2: return 2;
108 case PPC::CR3: return 3;
109 case PPC::CR4: return 4;
110 case PPC::CR5: return 5;
111 case PPC::CR6: return 6;
112 case PPC::CR7: return 7;
117 /// printInstruction - This method is automatically generated by tablegen
118 /// from the instruction set description. This method returns true if the
119 /// machine instruction was sufficiently described to print it, otherwise it
121 void printInstruction(const MachineInstr *MI);
123 void printMachineInstruction(const MachineInstr *MI);
124 void printOp(const MachineOperand &MO);
126 /// stripRegisterPrefix - This method strips the character prefix from a
127 /// register name so that only the number is left. Used by for linux asm.
128 const char *stripRegisterPrefix(const char *RegName) {
129 switch (RegName[0]) {
132 case 'v': return RegName + 1;
133 case 'c': if (RegName[1] == 'r') return RegName + 2;
139 /// printRegister - Print register according to target requirements.
141 void printRegister(const MachineOperand &MO, bool R0AsZero) {
142 unsigned RegNo = MO.getReg();
143 assert(TargetRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??");
145 // If we should use 0 for R0.
146 if (R0AsZero && RegNo == PPC::R0) {
151 const char *RegName = TM.getRegisterInfo()->get(RegNo).AsmName;
152 // Linux assembler (Others?) does not take register mnemonics.
153 // FIXME - What about special registers used in mfspr/mtspr?
154 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
158 void printOperand(const MachineInstr *MI, unsigned OpNo) {
159 const MachineOperand &MO = MI->getOperand(OpNo);
161 printRegister(MO, false);
162 } else if (MO.isImm()) {
169 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
170 unsigned AsmVariant, const char *ExtraCode);
171 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
172 unsigned AsmVariant, const char *ExtraCode);
175 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
176 char value = MI->getOperand(OpNo).getImm();
177 value = (value << (32-5)) >> (32-5);
180 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
181 unsigned char value = MI->getOperand(OpNo).getImm();
182 assert(value <= 31 && "Invalid u5imm argument!");
183 O << (unsigned int)value;
185 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) {
186 unsigned char value = MI->getOperand(OpNo).getImm();
187 assert(value <= 63 && "Invalid u6imm argument!");
188 O << (unsigned int)value;
190 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
191 O << (short)MI->getOperand(OpNo).getImm();
193 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
194 O << (unsigned short)MI->getOperand(OpNo).getImm();
196 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
197 if (MI->getOperand(OpNo).isImm()) {
198 O << (short)(MI->getOperand(OpNo).getImm()*4);
201 printOp(MI->getOperand(OpNo));
202 if (TM.getRelocationModel() == Reloc::PIC_)
203 O << "-\"L" << getFunctionNumber() << "$pb\")";
208 void printBranchOperand(const MachineInstr *MI, unsigned OpNo) {
209 // Branches can take an immediate operand. This is used by the branch
210 // selection pass to print $+8, an eight byte displacement from the PC.
211 if (MI->getOperand(OpNo).isImm()) {
212 O << "$+" << MI->getOperand(OpNo).getImm()*4;
214 printOp(MI->getOperand(OpNo));
217 void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
218 const MachineOperand &MO = MI->getOperand(OpNo);
219 if (TM.getRelocationModel() != Reloc::Static) {
220 if (MO.getType() == MachineOperand::MO_GlobalAddress) {
221 GlobalValue *GV = MO.getGlobal();
222 if (GV->isDeclaration() || GV->isWeakForLinker()) {
223 // Dynamically-resolved functions need a stub for the function.
224 FnStubInfo &FnInfo = FnStubs[Mang->getMangledName(GV)];
225 FnInfo.Init(GV, Mang);
230 if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
231 FnStubInfo &FnInfo =FnStubs[Mang->makeNameProper(MO.getSymbolName())];
232 FnInfo.Init(MO.getSymbolName(), Mang);
238 printOp(MI->getOperand(OpNo));
240 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
241 O << (int)MI->getOperand(OpNo).getImm()*4;
243 void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
244 O << "\"L" << getFunctionNumber() << "$pb\"\n";
245 O << "\"L" << getFunctionNumber() << "$pb\":";
247 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
248 if (MI->getOperand(OpNo).isImm()) {
249 printS16ImmOperand(MI, OpNo);
251 if (Subtarget.isDarwin()) O << "ha16(";
252 printOp(MI->getOperand(OpNo));
253 if (TM.getRelocationModel() == Reloc::PIC_)
254 O << "-\"L" << getFunctionNumber() << "$pb\"";
255 if (Subtarget.isDarwin())
261 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
262 if (MI->getOperand(OpNo).isImm()) {
263 printS16ImmOperand(MI, OpNo);
265 if (Subtarget.isDarwin()) O << "lo16(";
266 printOp(MI->getOperand(OpNo));
267 if (TM.getRelocationModel() == Reloc::PIC_)
268 O << "-\"L" << getFunctionNumber() << "$pb\"";
269 if (Subtarget.isDarwin())
275 void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
276 unsigned CCReg = MI->getOperand(OpNo).getReg();
277 unsigned RegNo = enumRegToMachineReg(CCReg);
278 O << (0x80 >> RegNo);
280 // The new addressing mode printers.
281 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
282 printSymbolLo(MI, OpNo);
284 if (MI->getOperand(OpNo+1).isReg() &&
285 MI->getOperand(OpNo+1).getReg() == PPC::R0)
288 printOperand(MI, OpNo+1);
291 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) {
292 if (MI->getOperand(OpNo).isImm())
293 printS16X4ImmOperand(MI, OpNo);
295 printSymbolLo(MI, OpNo);
297 if (MI->getOperand(OpNo+1).isReg() &&
298 MI->getOperand(OpNo+1).getReg() == PPC::R0)
301 printOperand(MI, OpNo+1);
305 void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
306 // When used as the base register, r0 reads constant zero rather than
307 // the value contained in the register. For this reason, the darwin
308 // assembler requires that we print r0 as 0 (no r) when used as the base.
309 const MachineOperand &MO = MI->getOperand(OpNo);
310 printRegister(MO, true);
312 printOperand(MI, OpNo+1);
315 void printTOCEntryLabel(const MachineInstr *MI, unsigned OpNo) {
316 const MachineOperand &MO = MI->getOperand(OpNo);
318 assert(MO.getType() == MachineOperand::MO_GlobalAddress);
320 GlobalValue *GV = MO.getGlobal();
322 std::string Name = Mang->getMangledName(GV);
324 // Map symbol -> label of TOC entry.
325 if (TOC.count(Name) == 0) {
327 Label += MAI->getPrivateGlobalPrefix();
329 Label += utostr(LabelID++);
334 O << TOC[Name] << "@toc";
337 void printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
338 const char *Modifier);
340 virtual bool runOnMachineFunction(MachineFunction &F) = 0;
342 virtual void EmitExternalGlobal(const GlobalVariable *GV);
345 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
346 class VISIBILITY_HIDDEN PPCLinuxAsmPrinter : public PPCAsmPrinter {
348 explicit PPCLinuxAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
349 const MCAsmInfo *T, bool V)
350 : PPCAsmPrinter(O, TM, T, V){}
352 virtual const char *getPassName() const {
353 return "Linux PPC Assembly Printer";
356 bool runOnMachineFunction(MachineFunction &F);
357 bool doFinalization(Module &M);
359 void getAnalysisUsage(AnalysisUsage &AU) const {
360 AU.setPreservesAll();
361 AU.addRequired<MachineModuleInfo>();
362 AU.addRequired<DwarfWriter>();
363 PPCAsmPrinter::getAnalysisUsage(AU);
366 void PrintGlobalVariable(const GlobalVariable *GVar);
369 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
371 class VISIBILITY_HIDDEN PPCDarwinAsmPrinter : public PPCAsmPrinter {
372 formatted_raw_ostream &OS;
374 explicit PPCDarwinAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
375 const MCAsmInfo *T, bool V)
376 : PPCAsmPrinter(O, TM, T, V), OS(O) {}
378 virtual const char *getPassName() const {
379 return "Darwin PPC Assembly Printer";
382 bool runOnMachineFunction(MachineFunction &F);
383 bool doInitialization(Module &M);
384 bool doFinalization(Module &M);
386 void getAnalysisUsage(AnalysisUsage &AU) const {
387 AU.setPreservesAll();
388 AU.addRequired<MachineModuleInfo>();
389 AU.addRequired<DwarfWriter>();
390 PPCAsmPrinter::getAnalysisUsage(AU);
393 void PrintGlobalVariable(const GlobalVariable *GVar);
395 } // end of anonymous namespace
397 // Include the auto-generated portion of the assembly writer
398 #include "PPCGenAsmWriter.inc"
400 void PPCAsmPrinter::printOp(const MachineOperand &MO) {
401 switch (MO.getType()) {
402 case MachineOperand::MO_Immediate:
403 llvm_unreachable("printOp() does not handle immediate values");
405 case MachineOperand::MO_MachineBasicBlock:
406 printBasicBlockLabel(MO.getMBB());
408 case MachineOperand::MO_JumpTableIndex:
409 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
410 << '_' << MO.getIndex();
411 // FIXME: PIC relocation model
413 case MachineOperand::MO_ConstantPoolIndex:
414 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
415 << '_' << MO.getIndex();
417 case MachineOperand::MO_ExternalSymbol: {
418 // Computing the address of an external symbol, not calling it.
419 std::string Name(MAI->getGlobalPrefix());
420 Name += MO.getSymbolName();
422 if (TM.getRelocationModel() != Reloc::Static) {
423 GVStubs[Name] = Name+"$non_lazy_ptr";
424 Name += "$non_lazy_ptr";
429 case MachineOperand::MO_GlobalAddress: {
430 // Computing the address of a global symbol, not calling it.
431 GlobalValue *GV = MO.getGlobal();
434 // External or weakly linked global variables need non-lazily-resolved stubs
435 if (TM.getRelocationModel() != Reloc::Static &&
436 (GV->isDeclaration() || GV->isWeakForLinker())) {
437 if (!GV->hasHiddenVisibility()) {
438 Name = Mang->getMangledName(GV, "$non_lazy_ptr", true);
439 GVStubs[Mang->getMangledName(GV)] = Name;
440 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
441 GV->hasAvailableExternallyLinkage()) {
442 Name = Mang->getMangledName(GV, "$non_lazy_ptr", true);
443 HiddenGVStubs[Mang->getMangledName(GV)] = Name;
445 Name = Mang->getMangledName(GV);
448 Name = Mang->getMangledName(GV);
452 printOffset(MO.getOffset());
457 O << "<unknown operand type: " << MO.getType() << ">";
462 /// EmitExternalGlobal - In this case we need to use the indirect symbol.
464 void PPCAsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
467 if (TM.getRelocationModel() != Reloc::Static) {
468 Name = Mang->getMangledName(GV, "$non_lazy_ptr", true);
470 Name = Mang->getMangledName(GV);
475 /// PrintAsmOperand - Print out an operand for an inline asm expression.
477 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
479 const char *ExtraCode) {
480 // Does this asm operand have a single letter operand modifier?
481 if (ExtraCode && ExtraCode[0]) {
482 if (ExtraCode[1] != 0) return true; // Unknown modifier.
484 switch (ExtraCode[0]) {
485 default: return true; // Unknown modifier.
486 case 'c': // Don't print "$" before a global var name or constant.
487 // PPC never has a prefix.
488 printOperand(MI, OpNo);
490 case 'L': // Write second word of DImode reference.
491 // Verify that this operand has two consecutive registers.
492 if (!MI->getOperand(OpNo).isReg() ||
493 OpNo+1 == MI->getNumOperands() ||
494 !MI->getOperand(OpNo+1).isReg())
496 ++OpNo; // Return the high-part.
499 // Write 'i' if an integer constant, otherwise nothing. Used to print
501 if (MI->getOperand(OpNo).isImm())
507 printOperand(MI, OpNo);
511 // At the moment, all inline asm memory operands are a single register.
512 // In any case, the output of this routine should always be just one
513 // assembler operand.
515 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
517 const char *ExtraCode) {
518 if (ExtraCode && ExtraCode[0])
519 return true; // Unknown modifier.
520 assert (MI->getOperand(OpNo).isReg());
521 printOperand(MI, OpNo);
525 void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
526 const char *Modifier) {
527 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
528 unsigned Code = MI->getOperand(OpNo).getImm();
529 if (!strcmp(Modifier, "cc")) {
530 switch ((PPC::Predicate)Code) {
531 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
532 case PPC::PRED_LT: O << "lt"; return;
533 case PPC::PRED_LE: O << "le"; return;
534 case PPC::PRED_EQ: O << "eq"; return;
535 case PPC::PRED_GE: O << "ge"; return;
536 case PPC::PRED_GT: O << "gt"; return;
537 case PPC::PRED_NE: O << "ne"; return;
538 case PPC::PRED_UN: O << "un"; return;
539 case PPC::PRED_NU: O << "nu"; return;
543 assert(!strcmp(Modifier, "reg") &&
544 "Need to specify 'cc' or 'reg' as predicate op modifier!");
545 // Don't print the register for 'always'.
546 if (Code == PPC::PRED_ALWAYS) return;
547 printOperand(MI, OpNo+1);
552 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
553 /// the current output stream.
555 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
558 // Check for slwi/srwi mnemonics.
559 if (MI->getOpcode() == PPC::RLWINM) {
560 bool FoundMnemonic = false;
561 unsigned char SH = MI->getOperand(2).getImm();
562 unsigned char MB = MI->getOperand(3).getImm();
563 unsigned char ME = MI->getOperand(4).getImm();
564 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
565 O << "\tslwi "; FoundMnemonic = true;
567 if (SH <= 31 && MB == (32-SH) && ME == 31) {
568 O << "\tsrwi "; FoundMnemonic = true;
575 O << ", " << (unsigned int)SH << '\n';
578 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
579 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
587 } else if (MI->getOpcode() == PPC::RLDICR) {
588 unsigned char SH = MI->getOperand(2).getImm();
589 unsigned char ME = MI->getOperand(3).getImm();
590 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
596 O << ", " << (unsigned int)SH << '\n';
601 printInstruction(MI);
604 /// runOnMachineFunction - This uses the printMachineInstruction()
605 /// method to print assembly for each instruction.
607 bool PPCLinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
610 SetupMachineFunction(MF);
613 // Print out constants referenced by the function
614 EmitConstantPool(MF.getConstantPool());
616 // Print out labels for the function.
617 const Function *F = MF.getFunction();
618 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
620 switch (F->getLinkage()) {
621 default: llvm_unreachable("Unknown linkage type!");
622 case Function::PrivateLinkage:
623 case Function::LinkerPrivateLinkage:
624 case Function::InternalLinkage: // Symbols default to internal.
626 case Function::ExternalLinkage:
627 O << "\t.global\t" << CurrentFnName << '\n'
628 << "\t.type\t" << CurrentFnName << ", @function\n";
630 case Function::WeakAnyLinkage:
631 case Function::WeakODRLinkage:
632 case Function::LinkOnceAnyLinkage:
633 case Function::LinkOnceODRLinkage:
634 O << "\t.global\t" << CurrentFnName << '\n';
635 O << "\t.weak\t" << CurrentFnName << '\n';
639 printVisibility(CurrentFnName, F->getVisibility());
641 EmitAlignment(MF.getAlignment(), F);
643 if (Subtarget.isPPC64()) {
644 // Emit an official procedure descriptor.
645 // FIXME 64-bit SVR4: Use MCSection here?
646 O << "\t.section\t\".opd\",\"aw\"\n";
648 O << CurrentFnName << ":\n";
649 O << "\t.quad .L." << CurrentFnName << ",.TOC.@tocbase\n";
650 O << "\t.previous\n";
651 O << ".L." << CurrentFnName << ":\n";
653 O << CurrentFnName << ":\n";
656 // Emit pre-function debug information.
657 DW->BeginFunction(&MF);
659 // Print out code for the function.
660 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
662 // Print a label for the basic block.
663 if (I != MF.begin()) {
664 printBasicBlockLabel(I, true, true);
667 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
669 // Print the assembly for the instruction.
670 printMachineInstruction(II);
674 O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << '\n';
676 // Print out jump tables referenced by the function.
677 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
679 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
681 // Emit post-function debug information.
682 DW->EndFunction(&MF);
684 // We didn't modify anything.
688 void PPCLinuxAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
689 const TargetData *TD = TM.getTargetData();
691 if (!GVar->hasInitializer())
692 return; // External global require no code
694 // Check to see if this is a special global used by LLVM, if so, emit it.
695 if (EmitSpecialLLVMGlobal(GVar))
698 std::string name = Mang->getMangledName(GVar);
700 printVisibility(name, GVar->getVisibility());
702 Constant *C = GVar->getInitializer();
703 const Type *Type = C->getType();
704 unsigned Size = TD->getTypeAllocSize(Type);
705 unsigned Align = TD->getPreferredAlignmentLog(GVar);
707 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GVar, Mang,
710 if (C->isNullValue() && /* FIXME: Verify correct */
711 !GVar->hasSection() &&
712 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
713 GVar->isWeakForLinker())) {
714 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
716 if (GVar->hasExternalLinkage()) {
717 O << "\t.global " << name << '\n';
718 O << "\t.type " << name << ", @object\n";
720 O << "\t.zero " << Size << '\n';
721 } else if (GVar->hasLocalLinkage()) {
722 O << MAI->getLCOMMDirective() << name << ',' << Size;
724 O << ".comm " << name << ',' << Size;
727 O << "\t\t" << MAI->getCommentString() << " '";
728 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
735 switch (GVar->getLinkage()) {
736 case GlobalValue::LinkOnceAnyLinkage:
737 case GlobalValue::LinkOnceODRLinkage:
738 case GlobalValue::WeakAnyLinkage:
739 case GlobalValue::WeakODRLinkage:
740 case GlobalValue::CommonLinkage:
741 O << "\t.global " << name << '\n'
742 << "\t.type " << name << ", @object\n"
743 << "\t.weak " << name << '\n';
745 case GlobalValue::AppendingLinkage:
746 // FIXME: appending linkage variables should go into a section of
747 // their name or something. For now, just emit them as external.
748 case GlobalValue::ExternalLinkage:
749 // If external or appending, declare as a global symbol
750 O << "\t.global " << name << '\n'
751 << "\t.type " << name << ", @object\n";
753 case GlobalValue::InternalLinkage:
754 case GlobalValue::PrivateLinkage:
755 case GlobalValue::LinkerPrivateLinkage:
758 llvm_unreachable("Unknown linkage type!");
761 EmitAlignment(Align, GVar);
764 O << "\t\t\t\t" << MAI->getCommentString() << " '";
765 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
770 EmitGlobalConstant(C);
774 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
775 const TargetData *TD = TM.getTargetData();
777 bool isPPC64 = TD->getPointerSizeInBits() == 64;
779 if (isPPC64 && !TOC.empty()) {
780 // FIXME 64-bit SVR4: Use MCSection here?
781 O << "\t.section\t\".toc\",\"aw\"\n";
783 for (StringMap<std::string>::iterator I = TOC.begin(), E = TOC.end();
785 O << I->second << ":\n";
786 O << "\t.tc " << I->getKeyData() << "[TC]," << I->getKeyData() << '\n';
790 return AsmPrinter::doFinalization(M);
793 /// runOnMachineFunction - This uses the printMachineInstruction()
794 /// method to print assembly for each instruction.
796 bool PPCDarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
799 SetupMachineFunction(MF);
802 // Print out constants referenced by the function
803 EmitConstantPool(MF.getConstantPool());
805 // Print out labels for the function.
806 const Function *F = MF.getFunction();
807 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
809 switch (F->getLinkage()) {
810 default: llvm_unreachable("Unknown linkage type!");
811 case Function::PrivateLinkage:
812 case Function::LinkerPrivateLinkage:
813 case Function::InternalLinkage: // Symbols default to internal.
815 case Function::ExternalLinkage:
816 O << "\t.globl\t" << CurrentFnName << '\n';
818 case Function::WeakAnyLinkage:
819 case Function::WeakODRLinkage:
820 case Function::LinkOnceAnyLinkage:
821 case Function::LinkOnceODRLinkage:
822 O << "\t.globl\t" << CurrentFnName << '\n';
823 O << "\t.weak_definition\t" << CurrentFnName << '\n';
827 printVisibility(CurrentFnName, F->getVisibility());
829 EmitAlignment(MF.getAlignment(), F);
830 O << CurrentFnName << ":\n";
832 // Emit pre-function debug information.
833 DW->BeginFunction(&MF);
835 // If the function is empty, then we need to emit *something*. Otherwise, the
836 // function's label might be associated with something that it wasn't meant to
837 // be associated with. We emit a noop in this situation.
838 MachineFunction::iterator I = MF.begin();
840 if (++I == MF.end() && MF.front().empty())
843 // Print out code for the function.
844 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
846 // Print a label for the basic block.
847 if (I != MF.begin()) {
848 printBasicBlockLabel(I, true, true, VerboseAsm);
851 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
853 // Print the assembly for the instruction.
854 printMachineInstruction(II);
858 // Print out jump tables referenced by the function.
859 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
861 // Emit post-function debug information.
862 DW->EndFunction(&MF);
864 // We didn't modify anything.
869 bool PPCDarwinAsmPrinter::doInitialization(Module &M) {
870 static const char *const CPUDirectives[] = {
882 unsigned Directive = Subtarget.getDarwinDirective();
883 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
884 Directive = PPC::DIR_970;
885 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
886 Directive = PPC::DIR_7400;
887 if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
888 Directive = PPC::DIR_64;
889 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
890 O << "\t.machine " << CPUDirectives[Directive] << '\n';
892 bool Result = AsmPrinter::doInitialization(M);
895 // Prime text sections so they are adjacent. This reduces the likelihood a
896 // large data or debug section causes a branch to exceed 16M limit.
897 TargetLoweringObjectFileMachO &TLOFMacho =
898 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
899 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
900 if (TM.getRelocationModel() == Reloc::PIC_) {
901 OutStreamer.SwitchSection(
902 TLOFMacho.getMachOSection("__TEXT", "__picsymbolstub1",
903 MCSectionMachO::S_SYMBOL_STUBS |
904 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
905 32, SectionKind::getText()));
906 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
907 OutStreamer.SwitchSection(
908 TLOFMacho.getMachOSection("__TEXT","__symbol_stub1",
909 MCSectionMachO::S_SYMBOL_STUBS |
910 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
911 16, SectionKind::getText()));
913 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
918 void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
919 const TargetData *TD = TM.getTargetData();
921 if (!GVar->hasInitializer())
922 return; // External global require no code
924 // Check to see if this is a special global used by LLVM, if so, emit it.
925 if (EmitSpecialLLVMGlobal(GVar)) {
926 if (TM.getRelocationModel() == Reloc::Static) {
927 if (GVar->getName() == "llvm.global_ctors")
928 O << ".reference .constructors_used\n";
929 else if (GVar->getName() == "llvm.global_dtors")
930 O << ".reference .destructors_used\n";
935 std::string name = Mang->getMangledName(GVar);
936 printVisibility(name, GVar->getVisibility());
938 Constant *C = GVar->getInitializer();
939 const Type *Type = C->getType();
940 unsigned Size = TD->getTypeAllocSize(Type);
941 unsigned Align = TD->getPreferredAlignmentLog(GVar);
943 const MCSection *TheSection =
944 getObjFileLowering().SectionForGlobal(GVar, Mang, TM);
945 OutStreamer.SwitchSection(TheSection);
947 /// FIXME: Drive this off the section!
948 if (C->isNullValue() && /* FIXME: Verify correct */
949 !GVar->hasSection() &&
950 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
951 GVar->isWeakForLinker()) &&
952 // Don't put things that should go in the cstring section into "comm".
953 !TheSection->getKind().isMergeableCString()) {
954 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
956 if (GVar->hasExternalLinkage()) {
957 O << "\t.globl " << name << '\n';
958 O << "\t.zerofill __DATA, __common, " << name << ", "
959 << Size << ", " << Align;
960 } else if (GVar->hasLocalLinkage()) {
961 O << MAI->getLCOMMDirective() << name << ',' << Size << ',' << Align;
962 } else if (!GVar->hasCommonLinkage()) {
963 O << "\t.globl " << name << '\n'
964 << MAI->getWeakDefDirective() << name << '\n';
965 EmitAlignment(Align, GVar);
968 O << "\t\t\t\t" << MAI->getCommentString() << " ";
969 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
972 EmitGlobalConstant(C);
975 O << ".comm " << name << ',' << Size;
976 // Darwin 9 and above support aligned common data.
977 if (Subtarget.isDarwin9())
981 O << "\t\t" << MAI->getCommentString() << " '";
982 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
989 switch (GVar->getLinkage()) {
990 case GlobalValue::LinkOnceAnyLinkage:
991 case GlobalValue::LinkOnceODRLinkage:
992 case GlobalValue::WeakAnyLinkage:
993 case GlobalValue::WeakODRLinkage:
994 case GlobalValue::CommonLinkage:
995 O << "\t.globl " << name << '\n'
996 << "\t.weak_definition " << name << '\n';
998 case GlobalValue::AppendingLinkage:
999 // FIXME: appending linkage variables should go into a section of
1000 // their name or something. For now, just emit them as external.
1001 case GlobalValue::ExternalLinkage:
1002 // If external or appending, declare as a global symbol
1003 O << "\t.globl " << name << '\n';
1005 case GlobalValue::InternalLinkage:
1006 case GlobalValue::PrivateLinkage:
1007 case GlobalValue::LinkerPrivateLinkage:
1010 llvm_unreachable("Unknown linkage type!");
1013 EmitAlignment(Align, GVar);
1016 O << "\t\t\t\t" << MAI->getCommentString() << " '";
1017 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
1022 EmitGlobalConstant(C);
1026 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1027 const TargetData *TD = TM.getTargetData();
1029 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1031 // Darwin/PPC always uses mach-o.
1032 TargetLoweringObjectFileMachO &TLOFMacho =
1033 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
1036 const MCSection *LSPSection = 0;
1037 if (!FnStubs.empty()) // .lazy_symbol_pointer
1038 LSPSection = TLOFMacho.getLazySymbolPointerSection();
1041 // Output stubs for dynamically-linked functions
1042 if (TM.getRelocationModel() == Reloc::PIC_ && !FnStubs.empty()) {
1043 const MCSection *StubSection =
1044 TLOFMacho.getMachOSection("__TEXT", "__picsymbolstub1",
1045 MCSectionMachO::S_SYMBOL_STUBS |
1046 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
1047 32, SectionKind::getText());
1048 for (StringMap<FnStubInfo>::iterator I = FnStubs.begin(), E = FnStubs.end();
1050 OutStreamer.SwitchSection(StubSection);
1052 const FnStubInfo &Info = I->second;
1053 O << Info.Stub << ":\n";
1054 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1056 O << "\tbcl 20,31," << Info.AnonSymbol << '\n';
1057 O << Info.AnonSymbol << ":\n";
1058 O << "\tmflr r11\n";
1059 O << "\taddis r11,r11,ha16(" << Info.LazyPtr << "-" << Info.AnonSymbol;
1062 O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(";
1063 O << Info.LazyPtr << "-" << Info.AnonSymbol << ")(r11)\n";
1064 O << "\tmtctr r12\n";
1067 OutStreamer.SwitchSection(LSPSection);
1068 O << Info.LazyPtr << ":\n";
1069 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1070 O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
1072 } else if (!FnStubs.empty()) {
1073 const MCSection *StubSection =
1074 TLOFMacho.getMachOSection("__TEXT","__symbol_stub1",
1075 MCSectionMachO::S_SYMBOL_STUBS |
1076 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
1077 16, SectionKind::getText());
1079 for (StringMap<FnStubInfo>::iterator I = FnStubs.begin(), E = FnStubs.end();
1081 OutStreamer.SwitchSection(StubSection);
1083 const FnStubInfo &Info = I->second;
1084 O << Info.Stub << ":\n";
1085 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1086 O << "\tlis r11,ha16(" << Info.LazyPtr << ")\n";
1087 O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(";
1088 O << Info.LazyPtr << ")(r11)\n";
1089 O << "\tmtctr r12\n";
1091 OutStreamer.SwitchSection(LSPSection);
1092 O << Info.LazyPtr << ":\n";
1093 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1094 O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
1100 if (MAI->doesSupportExceptionHandling() && MMI) {
1101 // Add the (possibly multiple) personalities to the set of global values.
1102 // Only referenced functions get into the Personalities list.
1103 const std::vector<Function *> &Personalities = MMI->getPersonalities();
1104 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1105 E = Personalities.end(); I != E; ++I) {
1107 GVStubs[Mang->getMangledName(*I)] =
1108 Mang->getMangledName(*I, "$non_lazy_ptr", true);
1112 // Output macho stubs for external and common global variables.
1113 if (!GVStubs.empty()) {
1114 // Switch with ".non_lazy_symbol_pointer" directive.
1115 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1116 EmitAlignment(isPPC64 ? 3 : 2);
1118 for (StringMap<std::string>::iterator I = GVStubs.begin(),
1119 E = GVStubs.end(); I != E; ++I) {
1120 O << I->second << ":\n";
1121 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1122 O << (isPPC64 ? "\t.quad\t0\n" : "\t.long\t0\n");
1126 if (!HiddenGVStubs.empty()) {
1127 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1128 EmitAlignment(isPPC64 ? 3 : 2);
1129 for (StringMap<std::string>::iterator I = HiddenGVStubs.begin(),
1130 E = HiddenGVStubs.end(); I != E; ++I) {
1131 O << I->second << ":\n";
1132 O << (isPPC64 ? "\t.quad\t" : "\t.long\t") << I->getKeyData() << '\n';
1136 // Funny Darwin hack: This flag tells the linker that no global symbols
1137 // contain code that falls through to other global symbols (e.g. the obvious
1138 // implementation of multiple entry points). If this doesn't occur, the
1139 // linker can safely perform dead code stripping. Since LLVM never generates
1140 // code that does this, it is always safe to set.
1141 O << "\t.subsections_via_symbols\n";
1143 return AsmPrinter::doFinalization(M);
1148 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1149 /// for a MachineFunction to the given output stream, in a format that the
1150 /// Darwin assembler can deal with.
1152 static AsmPrinter *createPPCAsmPrinterPass(formatted_raw_ostream &o,
1154 const MCAsmInfo *tai,
1156 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1158 if (Subtarget->isDarwin())
1159 return new PPCDarwinAsmPrinter(o, tm, tai, verbose);
1160 return new PPCLinuxAsmPrinter(o, tm, tai, verbose);
1163 // Force static initialization.
1164 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1165 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1166 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);