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());
522 printOperand(MI, OpNo);
527 void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
528 const char *Modifier) {
529 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
530 unsigned Code = MI->getOperand(OpNo).getImm();
531 if (!strcmp(Modifier, "cc")) {
532 switch ((PPC::Predicate)Code) {
533 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
534 case PPC::PRED_LT: O << "lt"; return;
535 case PPC::PRED_LE: O << "le"; return;
536 case PPC::PRED_EQ: O << "eq"; return;
537 case PPC::PRED_GE: O << "ge"; return;
538 case PPC::PRED_GT: O << "gt"; return;
539 case PPC::PRED_NE: O << "ne"; return;
540 case PPC::PRED_UN: O << "un"; return;
541 case PPC::PRED_NU: O << "nu"; return;
545 assert(!strcmp(Modifier, "reg") &&
546 "Need to specify 'cc' or 'reg' as predicate op modifier!");
547 // Don't print the register for 'always'.
548 if (Code == PPC::PRED_ALWAYS) return;
549 printOperand(MI, OpNo+1);
554 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
555 /// the current output stream.
557 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
560 // Check for slwi/srwi mnemonics.
561 if (MI->getOpcode() == PPC::RLWINM) {
562 bool FoundMnemonic = false;
563 unsigned char SH = MI->getOperand(2).getImm();
564 unsigned char MB = MI->getOperand(3).getImm();
565 unsigned char ME = MI->getOperand(4).getImm();
566 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
567 O << "\tslwi "; FoundMnemonic = true;
569 if (SH <= 31 && MB == (32-SH) && ME == 31) {
570 O << "\tsrwi "; FoundMnemonic = true;
577 O << ", " << (unsigned int)SH << '\n';
580 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
581 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
589 } else if (MI->getOpcode() == PPC::RLDICR) {
590 unsigned char SH = MI->getOperand(2).getImm();
591 unsigned char ME = MI->getOperand(3).getImm();
592 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
598 O << ", " << (unsigned int)SH << '\n';
603 printInstruction(MI);
606 /// runOnMachineFunction - This uses the printMachineInstruction()
607 /// method to print assembly for each instruction.
609 bool PPCLinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
612 SetupMachineFunction(MF);
615 // Print out constants referenced by the function
616 EmitConstantPool(MF.getConstantPool());
618 // Print out labels for the function.
619 const Function *F = MF.getFunction();
620 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
622 switch (F->getLinkage()) {
623 default: llvm_unreachable("Unknown linkage type!");
624 case Function::PrivateLinkage:
625 case Function::InternalLinkage: // Symbols default to internal.
627 case Function::ExternalLinkage:
628 O << "\t.global\t" << CurrentFnName << '\n'
629 << "\t.type\t" << CurrentFnName << ", @function\n";
631 case Function::LinkerPrivateLinkage:
632 case Function::WeakAnyLinkage:
633 case Function::WeakODRLinkage:
634 case Function::LinkOnceAnyLinkage:
635 case Function::LinkOnceODRLinkage:
636 O << "\t.global\t" << CurrentFnName << '\n';
637 O << "\t.weak\t" << CurrentFnName << '\n';
641 printVisibility(CurrentFnName, F->getVisibility());
643 EmitAlignment(MF.getAlignment(), F);
645 if (Subtarget.isPPC64()) {
646 // Emit an official procedure descriptor.
647 // FIXME 64-bit SVR4: Use MCSection here?
648 O << "\t.section\t\".opd\",\"aw\"\n";
650 O << CurrentFnName << ":\n";
651 O << "\t.quad .L." << CurrentFnName << ",.TOC.@tocbase\n";
652 O << "\t.previous\n";
653 O << ".L." << CurrentFnName << ":\n";
655 O << CurrentFnName << ":\n";
658 // Emit pre-function debug information.
659 DW->BeginFunction(&MF);
661 // Print out code for the function.
662 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
664 // Print a label for the basic block.
665 if (I != MF.begin()) {
666 printBasicBlockLabel(I, true, true);
669 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
671 // Print the assembly for the instruction.
672 printMachineInstruction(II);
676 O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << '\n';
678 // Print out jump tables referenced by the function.
679 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
681 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
683 // Emit post-function debug information.
684 DW->EndFunction(&MF);
686 // We didn't modify anything.
690 void PPCLinuxAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
691 const TargetData *TD = TM.getTargetData();
693 if (!GVar->hasInitializer())
694 return; // External global require no code
696 // Check to see if this is a special global used by LLVM, if so, emit it.
697 if (EmitSpecialLLVMGlobal(GVar))
700 std::string name = Mang->getMangledName(GVar);
702 printVisibility(name, GVar->getVisibility());
704 Constant *C = GVar->getInitializer();
705 const Type *Type = C->getType();
706 unsigned Size = TD->getTypeAllocSize(Type);
707 unsigned Align = TD->getPreferredAlignmentLog(GVar);
709 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GVar, Mang,
712 if (C->isNullValue() && /* FIXME: Verify correct */
713 !GVar->hasSection() &&
714 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
715 GVar->isWeakForLinker())) {
716 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
718 if (GVar->hasExternalLinkage()) {
719 O << "\t.global " << name << '\n';
720 O << "\t.type " << name << ", @object\n";
722 O << "\t.zero " << Size << '\n';
723 } else if (GVar->hasLocalLinkage()) {
724 O << MAI->getLCOMMDirective() << name << ',' << Size;
726 O << ".comm " << name << ',' << Size;
729 O << "\t\t" << MAI->getCommentString() << " '";
730 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
737 switch (GVar->getLinkage()) {
738 case GlobalValue::LinkOnceAnyLinkage:
739 case GlobalValue::LinkOnceODRLinkage:
740 case GlobalValue::WeakAnyLinkage:
741 case GlobalValue::WeakODRLinkage:
742 case GlobalValue::CommonLinkage:
743 case GlobalValue::LinkerPrivateLinkage:
744 O << "\t.global " << name << '\n'
745 << "\t.type " << name << ", @object\n"
746 << "\t.weak " << name << '\n';
748 case GlobalValue::AppendingLinkage:
749 // FIXME: appending linkage variables should go into a section of
750 // their name or something. For now, just emit them as external.
751 case GlobalValue::ExternalLinkage:
752 // If external or appending, declare as a global symbol
753 O << "\t.global " << name << '\n'
754 << "\t.type " << name << ", @object\n";
756 case GlobalValue::InternalLinkage:
757 case GlobalValue::PrivateLinkage:
760 llvm_unreachable("Unknown linkage type!");
763 EmitAlignment(Align, GVar);
766 O << "\t\t\t\t" << MAI->getCommentString() << " '";
767 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
772 EmitGlobalConstant(C);
776 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
777 const TargetData *TD = TM.getTargetData();
779 bool isPPC64 = TD->getPointerSizeInBits() == 64;
781 if (isPPC64 && !TOC.empty()) {
782 // FIXME 64-bit SVR4: Use MCSection here?
783 O << "\t.section\t\".toc\",\"aw\"\n";
785 for (StringMap<std::string>::iterator I = TOC.begin(), E = TOC.end();
787 O << I->second << ":\n";
788 O << "\t.tc " << I->getKeyData() << "[TC]," << I->getKeyData() << '\n';
792 return AsmPrinter::doFinalization(M);
795 /// runOnMachineFunction - This uses the printMachineInstruction()
796 /// method to print assembly for each instruction.
798 bool PPCDarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
801 SetupMachineFunction(MF);
804 // Print out constants referenced by the function
805 EmitConstantPool(MF.getConstantPool());
807 // Print out labels for the function.
808 const Function *F = MF.getFunction();
809 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
811 switch (F->getLinkage()) {
812 default: llvm_unreachable("Unknown linkage type!");
813 case Function::PrivateLinkage:
814 case Function::InternalLinkage: // Symbols default to internal.
816 case Function::ExternalLinkage:
817 O << "\t.globl\t" << CurrentFnName << '\n';
819 case Function::WeakAnyLinkage:
820 case Function::WeakODRLinkage:
821 case Function::LinkOnceAnyLinkage:
822 case Function::LinkOnceODRLinkage:
823 case Function::LinkerPrivateLinkage:
824 O << "\t.globl\t" << CurrentFnName << '\n';
825 O << "\t.weak_definition\t" << CurrentFnName << '\n';
829 printVisibility(CurrentFnName, F->getVisibility());
831 EmitAlignment(MF.getAlignment(), F);
832 O << CurrentFnName << ":\n";
834 // Emit pre-function debug information.
835 DW->BeginFunction(&MF);
837 // If the function is empty, then we need to emit *something*. Otherwise, the
838 // function's label might be associated with something that it wasn't meant to
839 // be associated with. We emit a noop in this situation.
840 MachineFunction::iterator I = MF.begin();
842 if (++I == MF.end() && MF.front().empty())
845 // Print out code for the function.
846 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
848 // Print a label for the basic block.
849 if (I != MF.begin()) {
850 printBasicBlockLabel(I, true, true, VerboseAsm);
853 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
855 // Print the assembly for the instruction.
856 printMachineInstruction(II);
860 // Print out jump tables referenced by the function.
861 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
863 // Emit post-function debug information.
864 DW->EndFunction(&MF);
866 // We didn't modify anything.
871 bool PPCDarwinAsmPrinter::doInitialization(Module &M) {
872 static const char *const CPUDirectives[] = {
884 unsigned Directive = Subtarget.getDarwinDirective();
885 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
886 Directive = PPC::DIR_970;
887 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
888 Directive = PPC::DIR_7400;
889 if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
890 Directive = PPC::DIR_64;
891 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
892 O << "\t.machine " << CPUDirectives[Directive] << '\n';
894 bool Result = AsmPrinter::doInitialization(M);
897 // Prime text sections so they are adjacent. This reduces the likelihood a
898 // large data or debug section causes a branch to exceed 16M limit.
899 TargetLoweringObjectFileMachO &TLOFMacho =
900 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
901 OutStreamer.SwitchSection(TLOFMacho.getTextCoalSection());
902 if (TM.getRelocationModel() == Reloc::PIC_) {
903 OutStreamer.SwitchSection(
904 TLOFMacho.getMachOSection("__TEXT", "__picsymbolstub1",
905 MCSectionMachO::S_SYMBOL_STUBS |
906 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
907 32, SectionKind::getText()));
908 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
909 OutStreamer.SwitchSection(
910 TLOFMacho.getMachOSection("__TEXT","__symbol_stub1",
911 MCSectionMachO::S_SYMBOL_STUBS |
912 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
913 16, SectionKind::getText()));
915 OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
920 void PPCDarwinAsmPrinter::PrintGlobalVariable(const GlobalVariable *GVar) {
921 const TargetData *TD = TM.getTargetData();
923 if (!GVar->hasInitializer())
924 return; // External global require no code
926 // Check to see if this is a special global used by LLVM, if so, emit it.
927 if (EmitSpecialLLVMGlobal(GVar)) {
928 if (TM.getRelocationModel() == Reloc::Static) {
929 if (GVar->getName() == "llvm.global_ctors")
930 O << ".reference .constructors_used\n";
931 else if (GVar->getName() == "llvm.global_dtors")
932 O << ".reference .destructors_used\n";
937 std::string name = Mang->getMangledName(GVar);
938 printVisibility(name, GVar->getVisibility());
940 Constant *C = GVar->getInitializer();
941 const Type *Type = C->getType();
942 unsigned Size = TD->getTypeAllocSize(Type);
943 unsigned Align = TD->getPreferredAlignmentLog(GVar);
945 const MCSection *TheSection =
946 getObjFileLowering().SectionForGlobal(GVar, Mang, TM);
947 OutStreamer.SwitchSection(TheSection);
949 /// FIXME: Drive this off the section!
950 if (C->isNullValue() && /* FIXME: Verify correct */
951 !GVar->hasSection() &&
952 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
953 GVar->isWeakForLinker()) &&
954 // Don't put things that should go in the cstring section into "comm".
955 !TheSection->getKind().isMergeableCString()) {
956 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
958 if (GVar->hasExternalLinkage()) {
959 O << "\t.globl " << name << '\n';
960 O << "\t.zerofill __DATA, __common, " << name << ", "
961 << Size << ", " << Align;
962 } else if (GVar->hasLocalLinkage()) {
963 O << MAI->getLCOMMDirective() << name << ',' << Size << ',' << Align;
964 } else if (!GVar->hasCommonLinkage()) {
965 O << "\t.globl " << name << '\n'
966 << MAI->getWeakDefDirective() << name << '\n';
967 EmitAlignment(Align, GVar);
970 O << "\t\t\t\t" << MAI->getCommentString() << " ";
971 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
974 EmitGlobalConstant(C);
977 O << ".comm " << name << ',' << Size;
978 // Darwin 9 and above support aligned common data.
979 if (Subtarget.isDarwin9())
983 O << "\t\t" << MAI->getCommentString() << " '";
984 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
991 switch (GVar->getLinkage()) {
992 case GlobalValue::LinkOnceAnyLinkage:
993 case GlobalValue::LinkOnceODRLinkage:
994 case GlobalValue::WeakAnyLinkage:
995 case GlobalValue::WeakODRLinkage:
996 case GlobalValue::CommonLinkage:
997 case GlobalValue::LinkerPrivateLinkage:
998 O << "\t.globl " << name << '\n'
999 << "\t.weak_definition " << name << '\n';
1001 case GlobalValue::AppendingLinkage:
1002 // FIXME: appending linkage variables should go into a section of
1003 // their name or something. For now, just emit them as external.
1004 case GlobalValue::ExternalLinkage:
1005 // If external or appending, declare as a global symbol
1006 O << "\t.globl " << name << '\n';
1008 case GlobalValue::InternalLinkage:
1009 case GlobalValue::PrivateLinkage:
1012 llvm_unreachable("Unknown linkage type!");
1015 EmitAlignment(Align, GVar);
1018 O << "\t\t\t\t" << MAI->getCommentString() << " '";
1019 WriteAsOperand(O, GVar, /*PrintType=*/false, GVar->getParent());
1024 EmitGlobalConstant(C);
1028 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
1029 const TargetData *TD = TM.getTargetData();
1031 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1033 // Darwin/PPC always uses mach-o.
1034 TargetLoweringObjectFileMachO &TLOFMacho =
1035 static_cast<TargetLoweringObjectFileMachO &>(getObjFileLowering());
1038 const MCSection *LSPSection = 0;
1039 if (!FnStubs.empty()) // .lazy_symbol_pointer
1040 LSPSection = TLOFMacho.getLazySymbolPointerSection();
1043 // Output stubs for dynamically-linked functions
1044 if (TM.getRelocationModel() == Reloc::PIC_ && !FnStubs.empty()) {
1045 const MCSection *StubSection =
1046 TLOFMacho.getMachOSection("__TEXT", "__picsymbolstub1",
1047 MCSectionMachO::S_SYMBOL_STUBS |
1048 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
1049 32, SectionKind::getText());
1050 for (StringMap<FnStubInfo>::iterator I = FnStubs.begin(), E = FnStubs.end();
1052 OutStreamer.SwitchSection(StubSection);
1054 const FnStubInfo &Info = I->second;
1055 O << Info.Stub << ":\n";
1056 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1058 O << "\tbcl 20,31," << Info.AnonSymbol << '\n';
1059 O << Info.AnonSymbol << ":\n";
1060 O << "\tmflr r11\n";
1061 O << "\taddis r11,r11,ha16(" << Info.LazyPtr << "-" << Info.AnonSymbol;
1064 O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(";
1065 O << Info.LazyPtr << "-" << Info.AnonSymbol << ")(r11)\n";
1066 O << "\tmtctr r12\n";
1069 OutStreamer.SwitchSection(LSPSection);
1070 O << Info.LazyPtr << ":\n";
1071 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1072 O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
1074 } else if (!FnStubs.empty()) {
1075 const MCSection *StubSection =
1076 TLOFMacho.getMachOSection("__TEXT","__symbol_stub1",
1077 MCSectionMachO::S_SYMBOL_STUBS |
1078 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
1079 16, SectionKind::getText());
1081 for (StringMap<FnStubInfo>::iterator I = FnStubs.begin(), E = FnStubs.end();
1083 OutStreamer.SwitchSection(StubSection);
1085 const FnStubInfo &Info = I->second;
1086 O << Info.Stub << ":\n";
1087 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1088 O << "\tlis r11,ha16(" << Info.LazyPtr << ")\n";
1089 O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(";
1090 O << Info.LazyPtr << ")(r11)\n";
1091 O << "\tmtctr r12\n";
1093 OutStreamer.SwitchSection(LSPSection);
1094 O << Info.LazyPtr << ":\n";
1095 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1096 O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
1102 if (MAI->doesSupportExceptionHandling() && MMI) {
1103 // Add the (possibly multiple) personalities to the set of global values.
1104 // Only referenced functions get into the Personalities list.
1105 const std::vector<Function *> &Personalities = MMI->getPersonalities();
1106 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1107 E = Personalities.end(); I != E; ++I) {
1109 GVStubs[Mang->getMangledName(*I)] =
1110 Mang->getMangledName(*I, "$non_lazy_ptr", true);
1114 // Output macho stubs for external and common global variables.
1115 if (!GVStubs.empty()) {
1116 // Switch with ".non_lazy_symbol_pointer" directive.
1117 OutStreamer.SwitchSection(TLOFMacho.getNonLazySymbolPointerSection());
1118 EmitAlignment(isPPC64 ? 3 : 2);
1120 for (StringMap<std::string>::iterator I = GVStubs.begin(),
1121 E = GVStubs.end(); I != E; ++I) {
1122 O << I->second << ":\n";
1123 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1124 O << (isPPC64 ? "\t.quad\t0\n" : "\t.long\t0\n");
1128 if (!HiddenGVStubs.empty()) {
1129 OutStreamer.SwitchSection(getObjFileLowering().getDataSection());
1130 EmitAlignment(isPPC64 ? 3 : 2);
1131 for (StringMap<std::string>::iterator I = HiddenGVStubs.begin(),
1132 E = HiddenGVStubs.end(); I != E; ++I) {
1133 O << I->second << ":\n";
1134 O << (isPPC64 ? "\t.quad\t" : "\t.long\t") << I->getKeyData() << '\n';
1138 // Funny Darwin hack: This flag tells the linker that no global symbols
1139 // contain code that falls through to other global symbols (e.g. the obvious
1140 // implementation of multiple entry points). If this doesn't occur, the
1141 // linker can safely perform dead code stripping. Since LLVM never generates
1142 // code that does this, it is always safe to set.
1143 O << "\t.subsections_via_symbols\n";
1145 return AsmPrinter::doFinalization(M);
1150 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1151 /// for a MachineFunction to the given output stream, in a format that the
1152 /// Darwin assembler can deal with.
1154 static AsmPrinter *createPPCAsmPrinterPass(formatted_raw_ostream &o,
1156 const MCAsmInfo *tai,
1158 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1160 if (Subtarget->isDarwin())
1161 return new PPCDarwinAsmPrinter(o, tm, tai, verbose);
1162 return new PPCLinuxAsmPrinter(o, tm, tai, verbose);
1165 // Force static initialization.
1166 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1167 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1168 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);