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/MDNode.h"
28 #include "llvm/Assembly/Writer.h"
29 #include "llvm/CodeGen/AsmPrinter.h"
30 #include "llvm/CodeGen/DwarfWriter.h"
31 #include "llvm/CodeGen/MachineModuleInfo.h"
32 #include "llvm/CodeGen/MachineFunctionPass.h"
33 #include "llvm/CodeGen/MachineInstr.h"
34 #include "llvm/CodeGen/MachineInstrBuilder.h"
35 #include "llvm/Support/Mangler.h"
36 #include "llvm/Support/MathExtras.h"
37 #include "llvm/Support/CommandLine.h"
38 #include "llvm/Support/Debug.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/Compiler.h"
41 #include "llvm/Support/FormattedStream.h"
42 #include "llvm/Target/TargetAsmInfo.h"
43 #include "llvm/Target/TargetRegisterInfo.h"
44 #include "llvm/Target/TargetInstrInfo.h"
45 #include "llvm/Target/TargetOptions.h"
46 #include "llvm/Target/TargetRegistry.h"
47 #include "llvm/ADT/Statistic.h"
48 #include "llvm/ADT/StringExtras.h"
49 #include "llvm/ADT/StringSet.h"
52 STATISTIC(EmittedInsts, "Number of machine instrs printed");
55 class VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter {
58 std::string Stub, LazyPtr, AnonSymbol;
62 void Init(const GlobalValue *GV, Mangler *Mang) {
63 // Already initialized.
64 if (!Stub.empty()) return;
65 Stub = Mang->getMangledName(GV, "$stub", true);
66 LazyPtr = Mang->getMangledName(GV, "$lazy_ptr", true);
67 AnonSymbol = Mang->getMangledName(GV, "$stub$tmp", true);
70 void Init(const std::string &GV, Mangler *Mang) {
71 // Already initialized.
72 if (!Stub.empty()) return;
73 Stub = Mang->makeNameProper(GV + "$stub",
75 LazyPtr = Mang->makeNameProper(GV + "$lazy_ptr",
77 AnonSymbol = Mang->makeNameProper(GV + "$stub$tmp",
82 StringMap<FnStubInfo> FnStubs;
83 StringMap<std::string> GVStubs, HiddenGVStubs;
84 const PPCSubtarget &Subtarget;
86 explicit PPCAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
87 const TargetAsmInfo *T, bool V)
88 : AsmPrinter(O, TM, T, V),
89 Subtarget(TM.getSubtarget<PPCSubtarget>()) {}
91 virtual const char *getPassName() const {
92 return "PowerPC Assembly Printer";
95 PPCTargetMachine &getTM() {
96 return static_cast<PPCTargetMachine&>(TM);
99 unsigned enumRegToMachineReg(unsigned enumReg) {
101 default: llvm_unreachable("Unhandled register!");
102 case PPC::CR0: return 0;
103 case PPC::CR1: return 1;
104 case PPC::CR2: return 2;
105 case PPC::CR3: return 3;
106 case PPC::CR4: return 4;
107 case PPC::CR5: return 5;
108 case PPC::CR6: return 6;
109 case PPC::CR7: return 7;
114 /// printInstruction - This method is automatically generated by tablegen
115 /// from the instruction set description. This method returns true if the
116 /// machine instruction was sufficiently described to print it, otherwise it
118 bool printInstruction(const MachineInstr *MI);
120 void printMachineInstruction(const MachineInstr *MI);
121 void printOp(const MachineOperand &MO);
123 /// stripRegisterPrefix - This method strips the character prefix from a
124 /// register name so that only the number is left. Used by for linux asm.
125 const char *stripRegisterPrefix(const char *RegName) {
126 switch (RegName[0]) {
129 case 'v': return RegName + 1;
130 case 'c': if (RegName[1] == 'r') return RegName + 2;
136 /// printRegister - Print register according to target requirements.
138 void printRegister(const MachineOperand &MO, bool R0AsZero) {
139 unsigned RegNo = MO.getReg();
140 assert(TargetRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??");
142 // If we should use 0 for R0.
143 if (R0AsZero && RegNo == PPC::R0) {
148 const char *RegName = TM.getRegisterInfo()->get(RegNo).AsmName;
149 // Linux assembler (Others?) does not take register mnemonics.
150 // FIXME - What about special registers used in mfspr/mtspr?
151 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
155 void printOperand(const MachineInstr *MI, unsigned OpNo) {
156 const MachineOperand &MO = MI->getOperand(OpNo);
158 printRegister(MO, false);
159 } else if (MO.isImm()) {
166 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
167 unsigned AsmVariant, const char *ExtraCode);
168 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
169 unsigned AsmVariant, const char *ExtraCode);
172 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
173 char value = MI->getOperand(OpNo).getImm();
174 value = (value << (32-5)) >> (32-5);
177 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
178 unsigned char value = MI->getOperand(OpNo).getImm();
179 assert(value <= 31 && "Invalid u5imm argument!");
180 O << (unsigned int)value;
182 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) {
183 unsigned char value = MI->getOperand(OpNo).getImm();
184 assert(value <= 63 && "Invalid u6imm argument!");
185 O << (unsigned int)value;
187 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
188 O << (short)MI->getOperand(OpNo).getImm();
190 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
191 O << (unsigned short)MI->getOperand(OpNo).getImm();
193 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
194 if (MI->getOperand(OpNo).isImm()) {
195 O << (short)(MI->getOperand(OpNo).getImm()*4);
198 printOp(MI->getOperand(OpNo));
199 if (TM.getRelocationModel() == Reloc::PIC_)
200 O << "-\"L" << getFunctionNumber() << "$pb\")";
205 void printBranchOperand(const MachineInstr *MI, unsigned OpNo) {
206 // Branches can take an immediate operand. This is used by the branch
207 // selection pass to print $+8, an eight byte displacement from the PC.
208 if (MI->getOperand(OpNo).isImm()) {
209 O << "$+" << MI->getOperand(OpNo).getImm()*4;
211 printOp(MI->getOperand(OpNo));
214 void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
215 const MachineOperand &MO = MI->getOperand(OpNo);
216 if (TM.getRelocationModel() != Reloc::Static) {
217 if (MO.getType() == MachineOperand::MO_GlobalAddress) {
218 GlobalValue *GV = MO.getGlobal();
219 if (GV->isDeclaration() || GV->isWeakForLinker()) {
220 // Dynamically-resolved functions need a stub for the function.
221 FnStubInfo &FnInfo = FnStubs[Mang->getMangledName(GV)];
222 FnInfo.Init(GV, Mang);
227 if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
228 FnStubInfo &FnInfo =FnStubs[Mang->makeNameProper(MO.getSymbolName())];
229 FnInfo.Init(MO.getSymbolName(), Mang);
235 printOp(MI->getOperand(OpNo));
237 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
238 O << (int)MI->getOperand(OpNo).getImm()*4;
240 void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
241 O << "\"L" << getFunctionNumber() << "$pb\"\n";
242 O << "\"L" << getFunctionNumber() << "$pb\":";
244 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
245 if (MI->getOperand(OpNo).isImm()) {
246 printS16ImmOperand(MI, OpNo);
248 if (Subtarget.isDarwin()) O << "ha16(";
249 printOp(MI->getOperand(OpNo));
250 if (TM.getRelocationModel() == Reloc::PIC_)
251 O << "-\"L" << getFunctionNumber() << "$pb\"";
252 if (Subtarget.isDarwin())
258 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
259 if (MI->getOperand(OpNo).isImm()) {
260 printS16ImmOperand(MI, OpNo);
262 if (Subtarget.isDarwin()) O << "lo16(";
263 printOp(MI->getOperand(OpNo));
264 if (TM.getRelocationModel() == Reloc::PIC_)
265 O << "-\"L" << getFunctionNumber() << "$pb\"";
266 if (Subtarget.isDarwin())
272 void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
273 unsigned CCReg = MI->getOperand(OpNo).getReg();
274 unsigned RegNo = enumRegToMachineReg(CCReg);
275 O << (0x80 >> RegNo);
277 // The new addressing mode printers.
278 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
279 printSymbolLo(MI, OpNo);
281 if (MI->getOperand(OpNo+1).isReg() &&
282 MI->getOperand(OpNo+1).getReg() == PPC::R0)
285 printOperand(MI, OpNo+1);
288 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) {
289 if (MI->getOperand(OpNo).isImm())
290 printS16X4ImmOperand(MI, OpNo);
292 printSymbolLo(MI, OpNo);
294 if (MI->getOperand(OpNo+1).isReg() &&
295 MI->getOperand(OpNo+1).getReg() == PPC::R0)
298 printOperand(MI, OpNo+1);
302 void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
303 // When used as the base register, r0 reads constant zero rather than
304 // the value contained in the register. For this reason, the darwin
305 // assembler requires that we print r0 as 0 (no r) when used as the base.
306 const MachineOperand &MO = MI->getOperand(OpNo);
307 printRegister(MO, true);
309 printOperand(MI, OpNo+1);
312 void printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
313 const char *Modifier);
315 virtual bool runOnMachineFunction(MachineFunction &F) = 0;
316 virtual bool doFinalization(Module &M) = 0;
318 virtual void EmitExternalGlobal(const GlobalVariable *GV);
321 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
322 class VISIBILITY_HIDDEN PPCLinuxAsmPrinter : public PPCAsmPrinter {
324 explicit PPCLinuxAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
325 const TargetAsmInfo *T, bool V)
326 : PPCAsmPrinter(O, TM, T, V){}
328 virtual const char *getPassName() const {
329 return "Linux PPC Assembly Printer";
332 bool runOnMachineFunction(MachineFunction &F);
333 bool doFinalization(Module &M);
335 void getAnalysisUsage(AnalysisUsage &AU) const {
336 AU.setPreservesAll();
337 AU.addRequired<MachineModuleInfo>();
338 AU.addRequired<DwarfWriter>();
339 PPCAsmPrinter::getAnalysisUsage(AU);
342 void printModuleLevelGV(const GlobalVariable* GVar);
345 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
347 class VISIBILITY_HIDDEN PPCDarwinAsmPrinter : public PPCAsmPrinter {
348 formatted_raw_ostream &OS;
350 explicit PPCDarwinAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
351 const TargetAsmInfo *T, bool V)
352 : PPCAsmPrinter(O, TM, T, V), OS(O) {}
354 virtual const char *getPassName() const {
355 return "Darwin PPC Assembly Printer";
358 bool runOnMachineFunction(MachineFunction &F);
359 bool doInitialization(Module &M);
360 bool doFinalization(Module &M);
362 void getAnalysisUsage(AnalysisUsage &AU) const {
363 AU.setPreservesAll();
364 AU.addRequired<MachineModuleInfo>();
365 AU.addRequired<DwarfWriter>();
366 PPCAsmPrinter::getAnalysisUsage(AU);
369 void printModuleLevelGV(const GlobalVariable* GVar);
371 } // end of anonymous namespace
373 // Include the auto-generated portion of the assembly writer
374 #include "PPCGenAsmWriter.inc"
376 void PPCAsmPrinter::printOp(const MachineOperand &MO) {
377 switch (MO.getType()) {
378 case MachineOperand::MO_Immediate:
379 llvm_unreachable("printOp() does not handle immediate values");
381 case MachineOperand::MO_MachineBasicBlock:
382 printBasicBlockLabel(MO.getMBB());
384 case MachineOperand::MO_JumpTableIndex:
385 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
386 << '_' << MO.getIndex();
387 // FIXME: PIC relocation model
389 case MachineOperand::MO_ConstantPoolIndex:
390 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
391 << '_' << MO.getIndex();
393 case MachineOperand::MO_ExternalSymbol: {
394 // Computing the address of an external symbol, not calling it.
395 std::string Name(TAI->getGlobalPrefix());
396 Name += MO.getSymbolName();
398 if (TM.getRelocationModel() != Reloc::Static) {
399 GVStubs[Name] = Name+"$non_lazy_ptr";
400 Name += "$non_lazy_ptr";
405 case MachineOperand::MO_GlobalAddress: {
406 // Computing the address of a global symbol, not calling it.
407 GlobalValue *GV = MO.getGlobal();
410 // External or weakly linked global variables need non-lazily-resolved stubs
411 if (TM.getRelocationModel() != Reloc::Static &&
412 (GV->isDeclaration() || GV->isWeakForLinker())) {
413 if (!GV->hasHiddenVisibility()) {
414 Name = Mang->getMangledName(GV, "$non_lazy_ptr", true);
415 GVStubs[Mang->getMangledName(GV)] = Name;
416 } else if (GV->isDeclaration() || GV->hasCommonLinkage() ||
417 GV->hasAvailableExternallyLinkage()) {
418 Name = Mang->getMangledName(GV, "$non_lazy_ptr", true);
419 HiddenGVStubs[Mang->getMangledName(GV)] = Name;
421 Name = Mang->getMangledName(GV);
424 Name = Mang->getMangledName(GV);
428 printOffset(MO.getOffset());
433 O << "<unknown operand type: " << MO.getType() << ">";
438 /// EmitExternalGlobal - In this case we need to use the indirect symbol.
440 void PPCAsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
443 if (TM.getRelocationModel() != Reloc::Static) {
444 Name = Mang->getMangledName(GV, "$non_lazy_ptr", true);
446 Name = Mang->getMangledName(GV);
451 /// PrintAsmOperand - Print out an operand for an inline asm expression.
453 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
455 const char *ExtraCode) {
456 // Does this asm operand have a single letter operand modifier?
457 if (ExtraCode && ExtraCode[0]) {
458 if (ExtraCode[1] != 0) return true; // Unknown modifier.
460 switch (ExtraCode[0]) {
461 default: return true; // Unknown modifier.
462 case 'c': // Don't print "$" before a global var name or constant.
463 // PPC never has a prefix.
464 printOperand(MI, OpNo);
466 case 'L': // Write second word of DImode reference.
467 // Verify that this operand has two consecutive registers.
468 if (!MI->getOperand(OpNo).isReg() ||
469 OpNo+1 == MI->getNumOperands() ||
470 !MI->getOperand(OpNo+1).isReg())
472 ++OpNo; // Return the high-part.
475 // Write 'i' if an integer constant, otherwise nothing. Used to print
477 if (MI->getOperand(OpNo).isImm())
483 printOperand(MI, OpNo);
487 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
489 const char *ExtraCode) {
490 if (ExtraCode && ExtraCode[0])
491 return true; // Unknown modifier.
492 if (MI->getOperand(OpNo).isReg())
493 printMemRegReg(MI, OpNo);
495 printMemRegImm(MI, OpNo);
499 void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
500 const char *Modifier) {
501 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
502 unsigned Code = MI->getOperand(OpNo).getImm();
503 if (!strcmp(Modifier, "cc")) {
504 switch ((PPC::Predicate)Code) {
505 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
506 case PPC::PRED_LT: O << "lt"; return;
507 case PPC::PRED_LE: O << "le"; return;
508 case PPC::PRED_EQ: O << "eq"; return;
509 case PPC::PRED_GE: O << "ge"; return;
510 case PPC::PRED_GT: O << "gt"; return;
511 case PPC::PRED_NE: O << "ne"; return;
512 case PPC::PRED_UN: O << "un"; return;
513 case PPC::PRED_NU: O << "nu"; return;
517 assert(!strcmp(Modifier, "reg") &&
518 "Need to specify 'cc' or 'reg' as predicate op modifier!");
519 // Don't print the register for 'always'.
520 if (Code == PPC::PRED_ALWAYS) return;
521 printOperand(MI, OpNo+1);
526 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
527 /// the current output stream.
529 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
532 // Check for slwi/srwi mnemonics.
533 if (MI->getOpcode() == PPC::RLWINM) {
534 bool FoundMnemonic = false;
535 unsigned char SH = MI->getOperand(2).getImm();
536 unsigned char MB = MI->getOperand(3).getImm();
537 unsigned char ME = MI->getOperand(4).getImm();
538 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
539 O << "\tslwi "; FoundMnemonic = true;
541 if (SH <= 31 && MB == (32-SH) && ME == 31) {
542 O << "\tsrwi "; FoundMnemonic = true;
549 O << ", " << (unsigned int)SH << '\n';
552 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
553 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
561 } else if (MI->getOpcode() == PPC::RLDICR) {
562 unsigned char SH = MI->getOperand(2).getImm();
563 unsigned char ME = MI->getOperand(3).getImm();
564 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
570 O << ", " << (unsigned int)SH << '\n';
575 if (printInstruction(MI))
576 return; // Printer was automatically generated
578 llvm_unreachable("Unhandled instruction in asm writer!");
581 /// runOnMachineFunction - This uses the printMachineInstruction()
582 /// method to print assembly for each instruction.
584 bool PPCLinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
587 SetupMachineFunction(MF);
590 // Print out constants referenced by the function
591 EmitConstantPool(MF.getConstantPool());
593 // Print out labels for the function.
594 const Function *F = MF.getFunction();
595 SwitchToSection(TAI->SectionForGlobal(F));
597 switch (F->getLinkage()) {
598 default: llvm_unreachable("Unknown linkage type!");
599 case Function::PrivateLinkage:
600 case Function::LinkerPrivateLinkage:
601 case Function::InternalLinkage: // Symbols default to internal.
603 case Function::ExternalLinkage:
604 O << "\t.global\t" << CurrentFnName << '\n'
605 << "\t.type\t" << CurrentFnName << ", @function\n";
607 case Function::WeakAnyLinkage:
608 case Function::WeakODRLinkage:
609 case Function::LinkOnceAnyLinkage:
610 case Function::LinkOnceODRLinkage:
611 O << "\t.global\t" << CurrentFnName << '\n';
612 O << "\t.weak\t" << CurrentFnName << '\n';
616 printVisibility(CurrentFnName, F->getVisibility());
618 EmitAlignment(MF.getAlignment(), F);
619 O << CurrentFnName << ":\n";
621 // Emit pre-function debug information.
622 DW->BeginFunction(&MF);
624 // Print out code for the function.
625 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
627 // Print a label for the basic block.
628 if (I != MF.begin()) {
629 printBasicBlockLabel(I, true, true);
632 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
634 // Print the assembly for the instruction.
635 printMachineInstruction(II);
639 O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << '\n';
641 // Print out jump tables referenced by the function.
642 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
644 SwitchToSection(TAI->SectionForGlobal(F));
646 // Emit post-function debug information.
647 DW->EndFunction(&MF);
651 // We didn't modify anything.
655 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
656 /// Don't print things like \\n or \\0.
657 static void PrintUnmangledNameSafely(const Value *V, formatted_raw_ostream &OS) {
658 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
664 void PPCLinuxAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
665 const TargetData *TD = TM.getTargetData();
667 if (!GVar->hasInitializer())
668 return; // External global require no code
670 // Check to see if this is a special global used by LLVM, if so, emit it.
671 if (EmitSpecialLLVMGlobal(GVar))
674 std::string name = Mang->getMangledName(GVar);
676 printVisibility(name, GVar->getVisibility());
678 Constant *C = GVar->getInitializer();
679 if (isa<MDNode>(C) || isa<MDString>(C))
681 const Type *Type = C->getType();
682 unsigned Size = TD->getTypeAllocSize(Type);
683 unsigned Align = TD->getPreferredAlignmentLog(GVar);
685 SwitchToSection(TAI->SectionForGlobal(GVar));
687 if (C->isNullValue() && /* FIXME: Verify correct */
688 !GVar->hasSection() &&
689 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
690 GVar->isWeakForLinker())) {
691 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
693 if (GVar->hasExternalLinkage()) {
694 O << "\t.global " << name << '\n';
695 O << "\t.type " << name << ", @object\n";
697 O << "\t.zero " << Size << '\n';
698 } else if (GVar->hasLocalLinkage()) {
699 O << TAI->getLCOMMDirective() << name << ',' << Size;
701 O << ".comm " << name << ',' << Size;
704 O << "\t\t" << TAI->getCommentString() << " '";
705 PrintUnmangledNameSafely(GVar, O);
712 switch (GVar->getLinkage()) {
713 case GlobalValue::LinkOnceAnyLinkage:
714 case GlobalValue::LinkOnceODRLinkage:
715 case GlobalValue::WeakAnyLinkage:
716 case GlobalValue::WeakODRLinkage:
717 case GlobalValue::CommonLinkage:
718 O << "\t.global " << name << '\n'
719 << "\t.type " << name << ", @object\n"
720 << "\t.weak " << name << '\n';
722 case GlobalValue::AppendingLinkage:
723 // FIXME: appending linkage variables should go into a section of
724 // their name or something. For now, just emit them as external.
725 case GlobalValue::ExternalLinkage:
726 // If external or appending, declare as a global symbol
727 O << "\t.global " << name << '\n'
728 << "\t.type " << name << ", @object\n";
730 case GlobalValue::InternalLinkage:
731 case GlobalValue::PrivateLinkage:
732 case GlobalValue::LinkerPrivateLinkage:
735 llvm_unreachable("Unknown linkage type!");
738 EmitAlignment(Align, GVar);
741 O << "\t\t\t\t" << TAI->getCommentString() << " '";
742 PrintUnmangledNameSafely(GVar, O);
747 EmitGlobalConstant(C);
751 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
752 // Print out module-level global variables here.
753 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
755 printModuleLevelGV(I);
757 return AsmPrinter::doFinalization(M);
760 /// runOnMachineFunction - This uses the printMachineInstruction()
761 /// method to print assembly for each instruction.
763 bool PPCDarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
766 SetupMachineFunction(MF);
769 // Print out constants referenced by the function
770 EmitConstantPool(MF.getConstantPool());
772 // Print out labels for the function.
773 const Function *F = MF.getFunction();
774 SwitchToSection(TAI->SectionForGlobal(F));
776 switch (F->getLinkage()) {
777 default: llvm_unreachable("Unknown linkage type!");
778 case Function::PrivateLinkage:
779 case Function::LinkerPrivateLinkage:
780 case Function::InternalLinkage: // Symbols default to internal.
782 case Function::ExternalLinkage:
783 O << "\t.globl\t" << CurrentFnName << '\n';
785 case Function::WeakAnyLinkage:
786 case Function::WeakODRLinkage:
787 case Function::LinkOnceAnyLinkage:
788 case Function::LinkOnceODRLinkage:
789 O << "\t.globl\t" << CurrentFnName << '\n';
790 O << "\t.weak_definition\t" << CurrentFnName << '\n';
794 printVisibility(CurrentFnName, F->getVisibility());
796 EmitAlignment(MF.getAlignment(), F);
797 O << CurrentFnName << ":\n";
799 // Emit pre-function debug information.
800 DW->BeginFunction(&MF);
802 // If the function is empty, then we need to emit *something*. Otherwise, the
803 // function's label might be associated with something that it wasn't meant to
804 // be associated with. We emit a noop in this situation.
805 MachineFunction::iterator I = MF.begin();
807 if (++I == MF.end() && MF.front().empty())
810 // Print out code for the function.
811 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
813 // Print a label for the basic block.
814 if (I != MF.begin()) {
815 printBasicBlockLabel(I, true, true, VerboseAsm);
818 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
820 // Print the assembly for the instruction.
821 printMachineInstruction(II);
825 // Print out jump tables referenced by the function.
826 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
828 // Emit post-function debug information.
829 DW->EndFunction(&MF);
831 // We didn't modify anything.
836 bool PPCDarwinAsmPrinter::doInitialization(Module &M) {
837 static const char *const CPUDirectives[] = {
849 unsigned Directive = Subtarget.getDarwinDirective();
850 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
851 Directive = PPC::DIR_970;
852 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
853 Directive = PPC::DIR_7400;
854 if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
855 Directive = PPC::DIR_64;
856 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
857 O << "\t.machine " << CPUDirectives[Directive] << '\n';
859 bool Result = AsmPrinter::doInitialization(M);
862 // Prime text sections so they are adjacent. This reduces the likelihood a
863 // large data or debug section causes a branch to exceed 16M limit.
864 SwitchToTextSection("\t.section __TEXT,__textcoal_nt,coalesced,"
865 "pure_instructions");
866 if (TM.getRelocationModel() == Reloc::PIC_) {
867 SwitchToTextSection("\t.section __TEXT,__picsymbolstub1,symbol_stubs,"
868 "pure_instructions,32");
869 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
870 SwitchToTextSection("\t.section __TEXT,__symbol_stub1,symbol_stubs,"
871 "pure_instructions,16");
873 SwitchToSection(TAI->getTextSection());
878 void PPCDarwinAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
879 const TargetData *TD = TM.getTargetData();
881 if (!GVar->hasInitializer())
882 return; // External global require no code
884 // Check to see if this is a special global used by LLVM, if so, emit it.
885 if (EmitSpecialLLVMGlobal(GVar)) {
886 if (TM.getRelocationModel() == Reloc::Static) {
887 if (GVar->getName() == "llvm.global_ctors")
888 O << ".reference .constructors_used\n";
889 else if (GVar->getName() == "llvm.global_dtors")
890 O << ".reference .destructors_used\n";
895 std::string name = Mang->getMangledName(GVar);
896 printVisibility(name, GVar->getVisibility());
898 Constant *C = GVar->getInitializer();
899 const Type *Type = C->getType();
900 unsigned Size = TD->getTypeAllocSize(Type);
901 unsigned Align = TD->getPreferredAlignmentLog(GVar);
903 SwitchToSection(TAI->SectionForGlobal(GVar));
905 if (C->isNullValue() && /* FIXME: Verify correct */
906 !GVar->hasSection() &&
907 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
908 GVar->isWeakForLinker()) &&
909 TAI->SectionKindForGlobal(GVar) != SectionKind::RODataMergeStr) {
910 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
912 if (GVar->hasExternalLinkage()) {
913 O << "\t.globl " << name << '\n';
914 O << "\t.zerofill __DATA, __common, " << name << ", "
915 << Size << ", " << Align;
916 } else if (GVar->hasLocalLinkage()) {
917 O << TAI->getLCOMMDirective() << name << ',' << Size << ',' << Align;
918 } else if (!GVar->hasCommonLinkage()) {
919 O << "\t.globl " << name << '\n'
920 << TAI->getWeakDefDirective() << name << '\n';
921 EmitAlignment(Align, GVar);
924 O << "\t\t\t\t" << TAI->getCommentString() << " ";
925 PrintUnmangledNameSafely(GVar, O);
928 EmitGlobalConstant(C);
931 O << ".comm " << name << ',' << Size;
932 // Darwin 9 and above support aligned common data.
933 if (Subtarget.isDarwin9())
937 O << "\t\t" << TAI->getCommentString() << " '";
938 PrintUnmangledNameSafely(GVar, O);
945 switch (GVar->getLinkage()) {
946 case GlobalValue::LinkOnceAnyLinkage:
947 case GlobalValue::LinkOnceODRLinkage:
948 case GlobalValue::WeakAnyLinkage:
949 case GlobalValue::WeakODRLinkage:
950 case GlobalValue::CommonLinkage:
951 O << "\t.globl " << name << '\n'
952 << "\t.weak_definition " << name << '\n';
954 case GlobalValue::AppendingLinkage:
955 // FIXME: appending linkage variables should go into a section of
956 // their name or something. For now, just emit them as external.
957 case GlobalValue::ExternalLinkage:
958 // If external or appending, declare as a global symbol
959 O << "\t.globl " << name << '\n';
961 case GlobalValue::InternalLinkage:
962 case GlobalValue::PrivateLinkage:
963 case GlobalValue::LinkerPrivateLinkage:
966 llvm_unreachable("Unknown linkage type!");
969 EmitAlignment(Align, GVar);
972 O << "\t\t\t\t" << TAI->getCommentString() << " '";
973 PrintUnmangledNameSafely(GVar, O);
978 EmitGlobalConstant(C);
982 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
983 const TargetData *TD = TM.getTargetData();
985 // Print out module-level global variables here.
986 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
988 printModuleLevelGV(I);
990 bool isPPC64 = TD->getPointerSizeInBits() == 64;
992 // Output stubs for dynamically-linked functions
993 if (TM.getRelocationModel() == Reloc::PIC_ && !FnStubs.empty()) {
994 for (StringMap<FnStubInfo>::iterator I = FnStubs.begin(), E = FnStubs.end();
996 SwitchToTextSection("\t.section __TEXT,__picsymbolstub1,symbol_stubs,"
997 "pure_instructions,32");
999 const FnStubInfo &Info = I->second;
1000 O << Info.Stub << ":\n";
1001 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1003 O << "\tbcl 20,31," << Info.AnonSymbol << '\n';
1004 O << Info.AnonSymbol << ":\n";
1005 O << "\tmflr r11\n";
1006 O << "\taddis r11,r11,ha16(" << Info.LazyPtr << "-" << Info.AnonSymbol;
1009 O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(";
1010 O << Info.LazyPtr << "-" << Info.AnonSymbol << ")(r11)\n";
1011 O << "\tmtctr r12\n";
1014 SwitchToDataSection(".lazy_symbol_pointer");
1015 O << Info.LazyPtr << ":\n";
1016 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1017 O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
1019 } else if (!FnStubs.empty()) {
1020 for (StringMap<FnStubInfo>::iterator I = FnStubs.begin(), E = FnStubs.end();
1022 SwitchToTextSection("\t.section __TEXT,__symbol_stub1,symbol_stubs,"
1023 "pure_instructions,16");
1025 const FnStubInfo &Info = I->second;
1026 O << Info.Stub << ":\n";
1027 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1028 O << "\tlis r11,ha16(" << Info.LazyPtr << ")\n";
1029 O << (isPPC64 ? "\tldu" : "\tlwzu") << " r12,lo16(";
1030 O << Info.LazyPtr << ")(r11)\n";
1031 O << "\tmtctr r12\n";
1033 SwitchToDataSection(".lazy_symbol_pointer");
1034 O << Info.LazyPtr << ":\n";
1035 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1036 O << (isPPC64 ? "\t.quad" : "\t.long") << " dyld_stub_binding_helper\n";
1042 if (TAI->doesSupportExceptionHandling() && MMI) {
1043 // Add the (possibly multiple) personalities to the set of global values.
1044 // Only referenced functions get into the Personalities list.
1045 const std::vector<Function *> &Personalities = MMI->getPersonalities();
1046 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1047 E = Personalities.end(); I != E; ++I) {
1049 GVStubs[Mang->getMangledName(*I)] =
1050 Mang->getMangledName(*I, "$non_lazy_ptr", true);
1054 // Output stubs for external and common global variables.
1055 if (!GVStubs.empty()) {
1056 SwitchToDataSection(".non_lazy_symbol_pointer");
1057 for (StringMap<std::string>::iterator I = GVStubs.begin(),
1058 E = GVStubs.end(); I != E; ++I) {
1059 O << I->second << ":\n";
1060 O << "\t.indirect_symbol " << I->getKeyData() << '\n';
1061 O << (isPPC64 ? "\t.quad\t0\n" : "\t.long\t0\n");
1065 if (!HiddenGVStubs.empty()) {
1066 SwitchToSection(TAI->getDataSection());
1067 EmitAlignment(isPPC64 ? 3 : 2);
1068 for (StringMap<std::string>::iterator I = HiddenGVStubs.begin(),
1069 E = HiddenGVStubs.end(); I != E; ++I) {
1070 O << I->second << ":\n";
1071 O << (isPPC64 ? "\t.quad\t" : "\t.long\t") << I->getKeyData() << '\n';
1075 // Funny Darwin hack: This flag tells the linker that no global symbols
1076 // contain code that falls through to other global symbols (e.g. the obvious
1077 // implementation of multiple entry points). If this doesn't occur, the
1078 // linker can safely perform dead code stripping. Since LLVM never generates
1079 // code that does this, it is always safe to set.
1080 O << "\t.subsections_via_symbols\n";
1082 return AsmPrinter::doFinalization(M);
1087 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1088 /// for a MachineFunction to the given output stream, in a format that the
1089 /// Darwin assembler can deal with.
1091 FunctionPass *llvm::createPPCAsmPrinterPass(formatted_raw_ostream &o,
1094 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1096 if (Subtarget->isDarwin()) {
1097 return new PPCDarwinAsmPrinter(o, tm, tm.getTargetAsmInfo(), verbose);
1099 return new PPCLinuxAsmPrinter(o, tm, tm.getTargetAsmInfo(), verbose);
1103 // Force static initialization.
1104 extern "C" void LLVMInitializePowerPCAsmPrinter() {
1105 TargetRegistry::RegisterAsmPrinter(ThePPC32Target, createPPCAsmPrinterPass);
1107 TargetRegistry::RegisterAsmPrinter(ThePPC64Target, createPPCAsmPrinterPass);