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/Support/Mangler.h"
35 #include "llvm/Support/MathExtras.h"
36 #include "llvm/Support/CommandLine.h"
37 #include "llvm/Support/Debug.h"
38 #include "llvm/Support/Compiler.h"
39 #include "llvm/Support/raw_ostream.h"
40 #include "llvm/Target/TargetAsmInfo.h"
41 #include "llvm/Target/TargetRegisterInfo.h"
42 #include "llvm/Target/TargetInstrInfo.h"
43 #include "llvm/Target/TargetOptions.h"
44 #include "llvm/ADT/Statistic.h"
45 #include "llvm/ADT/StringExtras.h"
46 #include "llvm/ADT/StringSet.h"
49 STATISTIC(EmittedInsts, "Number of machine instrs printed");
52 class VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter {
54 StringSet<> FnStubs, GVStubs, HiddenGVStubs;
55 const PPCSubtarget &Subtarget;
57 PPCAsmPrinter(raw_ostream &O, TargetMachine &TM,
58 const TargetAsmInfo *T, bool F)
59 : AsmPrinter(O, TM, T, F),
60 Subtarget(TM.getSubtarget<PPCSubtarget>()) {}
62 virtual const char *getPassName() const {
63 return "PowerPC Assembly Printer";
66 PPCTargetMachine &getTM() {
67 return static_cast<PPCTargetMachine&>(TM);
70 unsigned enumRegToMachineReg(unsigned enumReg) {
72 default: assert(0 && "Unhandled register!"); break;
73 case PPC::CR0: return 0;
74 case PPC::CR1: return 1;
75 case PPC::CR2: return 2;
76 case PPC::CR3: return 3;
77 case PPC::CR4: return 4;
78 case PPC::CR5: return 5;
79 case PPC::CR6: return 6;
80 case PPC::CR7: return 7;
85 /// printInstruction - This method is automatically generated by tablegen
86 /// from the instruction set description. This method returns true if the
87 /// machine instruction was sufficiently described to print it, otherwise it
89 bool printInstruction(const MachineInstr *MI);
91 void printMachineInstruction(const MachineInstr *MI);
92 void printOp(const MachineOperand &MO);
94 /// stripRegisterPrefix - This method strips the character prefix from a
95 /// register name so that only the number is left. Used by for linux asm.
96 const char *stripRegisterPrefix(const char *RegName) {
100 case 'v': return RegName + 1;
101 case 'c': if (RegName[1] == 'r') return RegName + 2;
107 /// printRegister - Print register according to target requirements.
109 void printRegister(const MachineOperand &MO, bool R0AsZero) {
110 unsigned RegNo = MO.getReg();
111 assert(TargetRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??");
113 // If we should use 0 for R0.
114 if (R0AsZero && RegNo == PPC::R0) {
119 const char *RegName = TM.getRegisterInfo()->get(RegNo).AsmName;
120 // Linux assembler (Others?) does not take register mnemonics.
121 // FIXME - What about special registers used in mfspr/mtspr?
122 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
126 void printOperand(const MachineInstr *MI, unsigned OpNo) {
127 const MachineOperand &MO = MI->getOperand(OpNo);
129 printRegister(MO, false);
130 } else if (MO.isImm()) {
137 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
138 unsigned AsmVariant, const char *ExtraCode);
139 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
140 unsigned AsmVariant, const char *ExtraCode);
143 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
144 char value = MI->getOperand(OpNo).getImm();
145 value = (value << (32-5)) >> (32-5);
148 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
149 unsigned char value = MI->getOperand(OpNo).getImm();
150 assert(value <= 31 && "Invalid u5imm argument!");
151 O << (unsigned int)value;
153 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) {
154 unsigned char value = MI->getOperand(OpNo).getImm();
155 assert(value <= 63 && "Invalid u6imm argument!");
156 O << (unsigned int)value;
158 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
159 O << (short)MI->getOperand(OpNo).getImm();
161 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
162 O << (unsigned short)MI->getOperand(OpNo).getImm();
164 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
165 if (MI->getOperand(OpNo).isImm()) {
166 O << (short)(MI->getOperand(OpNo).getImm()*4);
169 printOp(MI->getOperand(OpNo));
170 if (TM.getRelocationModel() == Reloc::PIC_)
171 O << "-\"L" << getFunctionNumber() << "$pb\")";
176 void printBranchOperand(const MachineInstr *MI, unsigned OpNo) {
177 // Branches can take an immediate operand. This is used by the branch
178 // selection pass to print $+8, an eight byte displacement from the PC.
179 if (MI->getOperand(OpNo).isImm()) {
180 O << "$+" << MI->getOperand(OpNo).getImm()*4;
182 printOp(MI->getOperand(OpNo));
185 void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
186 const MachineOperand &MO = MI->getOperand(OpNo);
187 if (TM.getRelocationModel() != Reloc::Static) {
188 if (MO.getType() == MachineOperand::MO_GlobalAddress) {
189 GlobalValue *GV = MO.getGlobal();
190 if (((GV->isDeclaration() || GV->hasWeakLinkage() ||
191 GV->hasLinkOnceLinkage() || GV->hasCommonLinkage()))) {
192 // Dynamically-resolved functions need a stub for the function.
193 std::string Name = Mang->getValueName(GV);
194 FnStubs.insert(Name);
195 printSuffixedName(Name, "$stub");
196 if (GV->hasExternalWeakLinkage())
197 ExtWeakSymbols.insert(GV);
201 if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
202 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName();
203 FnStubs.insert(Name);
204 printSuffixedName(Name, "$stub");
209 printOp(MI->getOperand(OpNo));
211 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
212 O << (int)MI->getOperand(OpNo).getImm()*4;
214 void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
215 O << "\"L" << getFunctionNumber() << "$pb\"\n";
216 O << "\"L" << getFunctionNumber() << "$pb\":";
218 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
219 if (MI->getOperand(OpNo).isImm()) {
220 printS16ImmOperand(MI, OpNo);
222 if (Subtarget.isDarwin()) O << "ha16(";
223 printOp(MI->getOperand(OpNo));
224 if (TM.getRelocationModel() == Reloc::PIC_)
225 O << "-\"L" << getFunctionNumber() << "$pb\"";
226 if (Subtarget.isDarwin())
232 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
233 if (MI->getOperand(OpNo).isImm()) {
234 printS16ImmOperand(MI, OpNo);
236 if (Subtarget.isDarwin()) O << "lo16(";
237 printOp(MI->getOperand(OpNo));
238 if (TM.getRelocationModel() == Reloc::PIC_)
239 O << "-\"L" << getFunctionNumber() << "$pb\"";
240 if (Subtarget.isDarwin())
246 void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
247 unsigned CCReg = MI->getOperand(OpNo).getReg();
248 unsigned RegNo = enumRegToMachineReg(CCReg);
249 O << (0x80 >> RegNo);
251 // The new addressing mode printers.
252 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
253 printSymbolLo(MI, OpNo);
255 if (MI->getOperand(OpNo+1).isReg() &&
256 MI->getOperand(OpNo+1).getReg() == PPC::R0)
259 printOperand(MI, OpNo+1);
262 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) {
263 if (MI->getOperand(OpNo).isImm())
264 printS16X4ImmOperand(MI, OpNo);
266 printSymbolLo(MI, OpNo);
268 if (MI->getOperand(OpNo+1).isReg() &&
269 MI->getOperand(OpNo+1).getReg() == PPC::R0)
272 printOperand(MI, OpNo+1);
276 void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
277 // When used as the base register, r0 reads constant zero rather than
278 // the value contained in the register. For this reason, the darwin
279 // assembler requires that we print r0 as 0 (no r) when used as the base.
280 const MachineOperand &MO = MI->getOperand(OpNo);
281 printRegister(MO, true);
283 printOperand(MI, OpNo+1);
286 void printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
287 const char *Modifier);
289 virtual bool runOnMachineFunction(MachineFunction &F) = 0;
290 virtual bool doFinalization(Module &M) = 0;
292 virtual void EmitExternalGlobal(const GlobalVariable *GV);
295 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
296 class VISIBILITY_HIDDEN PPCLinuxAsmPrinter : public PPCAsmPrinter {
298 MachineModuleInfo *MMI;
300 PPCLinuxAsmPrinter(raw_ostream &O, PPCTargetMachine &TM,
301 const TargetAsmInfo *T, bool F)
302 : PPCAsmPrinter(O, TM, T, F), DW(0), MMI(0) {}
304 virtual const char *getPassName() const {
305 return "Linux PPC Assembly Printer";
308 bool runOnMachineFunction(MachineFunction &F);
309 bool doInitialization(Module &M);
310 bool doFinalization(Module &M);
312 void getAnalysisUsage(AnalysisUsage &AU) const {
313 AU.setPreservesAll();
314 AU.addRequired<MachineModuleInfo>();
315 AU.addRequired<DwarfWriter>();
316 PPCAsmPrinter::getAnalysisUsage(AU);
319 void printModuleLevelGV(const GlobalVariable* GVar);
322 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
324 class VISIBILITY_HIDDEN PPCDarwinAsmPrinter : public PPCAsmPrinter {
326 MachineModuleInfo *MMI;
329 PPCDarwinAsmPrinter(raw_ostream &O, PPCTargetMachine &TM,
330 const TargetAsmInfo *T, bool F)
331 : PPCAsmPrinter(O, TM, T, F), DW(0), MMI(0), OS(O) {}
333 virtual const char *getPassName() const {
334 return "Darwin PPC Assembly Printer";
337 bool runOnMachineFunction(MachineFunction &F);
338 bool doInitialization(Module &M);
339 bool doFinalization(Module &M);
341 void getAnalysisUsage(AnalysisUsage &AU) const {
342 AU.setPreservesAll();
343 AU.addRequired<MachineModuleInfo>();
344 AU.addRequired<DwarfWriter>();
345 PPCAsmPrinter::getAnalysisUsage(AU);
348 void printModuleLevelGV(const GlobalVariable* GVar);
350 } // end of anonymous namespace
352 // Include the auto-generated portion of the assembly writer
353 #include "PPCGenAsmWriter.inc"
355 void PPCAsmPrinter::printOp(const MachineOperand &MO) {
356 switch (MO.getType()) {
357 case MachineOperand::MO_Immediate:
358 cerr << "printOp() does not handle immediate values\n";
362 case MachineOperand::MO_MachineBasicBlock:
363 printBasicBlockLabel(MO.getMBB());
365 case MachineOperand::MO_JumpTableIndex:
366 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
367 << '_' << MO.getIndex();
368 // FIXME: PIC relocation model
370 case MachineOperand::MO_ConstantPoolIndex:
371 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
372 << '_' << MO.getIndex();
374 case MachineOperand::MO_ExternalSymbol:
375 // Computing the address of an external symbol, not calling it.
376 if (TM.getRelocationModel() != Reloc::Static) {
377 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName();
378 GVStubs.insert(Name);
379 printSuffixedName(Name, "$non_lazy_ptr");
382 O << TAI->getGlobalPrefix() << MO.getSymbolName();
384 case MachineOperand::MO_GlobalAddress: {
385 // Computing the address of a global symbol, not calling it.
386 GlobalValue *GV = MO.getGlobal();
387 std::string Name = Mang->getValueName(GV);
389 // External or weakly linked global variables need non-lazily-resolved stubs
390 if (TM.getRelocationModel() != Reloc::Static) {
391 if (GV->isDeclaration() || GV->isWeakForLinker()) {
392 if (GV->hasHiddenVisibility()) {
393 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
396 HiddenGVStubs.insert(Name);
397 printSuffixedName(Name, "$non_lazy_ptr");
400 GVStubs.insert(Name);
401 printSuffixedName(Name, "$non_lazy_ptr");
403 if (GV->hasExternalWeakLinkage())
404 ExtWeakSymbols.insert(GV);
410 printOffset(MO.getOffset());
412 if (GV->hasExternalWeakLinkage())
413 ExtWeakSymbols.insert(GV);
418 O << "<unknown operand type: " << MO.getType() << ">";
423 /// EmitExternalGlobal - In this case we need to use the indirect symbol.
425 void PPCAsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
426 std::string Name = getGlobalLinkName(GV);
427 if (TM.getRelocationModel() != Reloc::Static) {
428 if (GV->hasHiddenVisibility())
429 HiddenGVStubs.insert(Name);
431 GVStubs.insert(Name);
432 printSuffixedName(Name, "$non_lazy_ptr");
438 /// PrintAsmOperand - Print out an operand for an inline asm expression.
440 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
442 const char *ExtraCode) {
443 // Does this asm operand have a single letter operand modifier?
444 if (ExtraCode && ExtraCode[0]) {
445 if (ExtraCode[1] != 0) return true; // Unknown modifier.
447 switch (ExtraCode[0]) {
448 default: return true; // Unknown modifier.
449 case 'c': // Don't print "$" before a global var name or constant.
450 // PPC never has a prefix.
451 printOperand(MI, OpNo);
453 case 'L': // Write second word of DImode reference.
454 // Verify that this operand has two consecutive registers.
455 if (!MI->getOperand(OpNo).isReg() ||
456 OpNo+1 == MI->getNumOperands() ||
457 !MI->getOperand(OpNo+1).isReg())
459 ++OpNo; // Return the high-part.
462 // Write 'i' if an integer constant, otherwise nothing. Used to print
464 if (MI->getOperand(OpNo).isImm())
470 printOperand(MI, OpNo);
474 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
476 const char *ExtraCode) {
477 if (ExtraCode && ExtraCode[0])
478 return true; // Unknown modifier.
479 if (MI->getOperand(OpNo).isReg())
480 printMemRegReg(MI, OpNo);
482 printMemRegImm(MI, OpNo);
486 void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
487 const char *Modifier) {
488 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
489 unsigned Code = MI->getOperand(OpNo).getImm();
490 if (!strcmp(Modifier, "cc")) {
491 switch ((PPC::Predicate)Code) {
492 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
493 case PPC::PRED_LT: O << "lt"; return;
494 case PPC::PRED_LE: O << "le"; return;
495 case PPC::PRED_EQ: O << "eq"; return;
496 case PPC::PRED_GE: O << "ge"; return;
497 case PPC::PRED_GT: O << "gt"; return;
498 case PPC::PRED_NE: O << "ne"; return;
499 case PPC::PRED_UN: O << "un"; return;
500 case PPC::PRED_NU: O << "nu"; return;
504 assert(!strcmp(Modifier, "reg") &&
505 "Need to specify 'cc' or 'reg' as predicate op modifier!");
506 // Don't print the register for 'always'.
507 if (Code == PPC::PRED_ALWAYS) return;
508 printOperand(MI, OpNo+1);
513 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
514 /// the current output stream.
516 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
519 // Check for slwi/srwi mnemonics.
520 if (MI->getOpcode() == PPC::RLWINM) {
521 bool FoundMnemonic = false;
522 unsigned char SH = MI->getOperand(2).getImm();
523 unsigned char MB = MI->getOperand(3).getImm();
524 unsigned char ME = MI->getOperand(4).getImm();
525 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
526 O << "\tslwi "; FoundMnemonic = true;
528 if (SH <= 31 && MB == (32-SH) && ME == 31) {
529 O << "\tsrwi "; FoundMnemonic = true;
536 O << ", " << (unsigned int)SH << '\n';
539 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
540 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
548 } else if (MI->getOpcode() == PPC::RLDICR) {
549 unsigned char SH = MI->getOperand(2).getImm();
550 unsigned char ME = MI->getOperand(3).getImm();
551 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
557 O << ", " << (unsigned int)SH << '\n';
562 if (printInstruction(MI))
563 return; // Printer was automatically generated
565 assert(0 && "Unhandled instruction in asm writer!");
570 /// runOnMachineFunction - This uses the printMachineInstruction()
571 /// method to print assembly for each instruction.
573 bool PPCLinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
576 SetupMachineFunction(MF);
579 // Print out constants referenced by the function
580 EmitConstantPool(MF.getConstantPool());
582 // Print out labels for the function.
583 const Function *F = MF.getFunction();
584 SwitchToSection(TAI->SectionForGlobal(F));
586 switch (F->getLinkage()) {
587 default: assert(0 && "Unknown linkage type!");
588 case Function::PrivateLinkage:
589 case Function::InternalLinkage: // Symbols default to internal.
591 case Function::ExternalLinkage:
592 O << "\t.global\t" << CurrentFnName << '\n'
593 << "\t.type\t" << CurrentFnName << ", @function\n";
595 case Function::WeakAnyLinkage:
596 case Function::WeakODRLinkage:
597 case Function::LinkOnceAnyLinkage:
598 case Function::LinkOnceODRLinkage:
599 O << "\t.global\t" << CurrentFnName << '\n';
600 O << "\t.weak\t" << CurrentFnName << '\n';
604 printVisibility(CurrentFnName, F->getVisibility());
607 O << CurrentFnName << ":\n";
609 // Emit pre-function debug information.
610 DW->BeginFunction(&MF);
612 // Print out code for the function.
613 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
615 // Print a label for the basic block.
616 if (I != MF.begin()) {
617 printBasicBlockLabel(I, true, true);
620 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
622 // Print the assembly for the instruction.
623 printMachineInstruction(II);
627 O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << '\n';
629 // Print out jump tables referenced by the function.
630 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
632 SwitchToSection(TAI->SectionForGlobal(F));
634 // Emit post-function debug information.
635 DW->EndFunction(&MF);
639 // We didn't modify anything.
643 bool PPCLinuxAsmPrinter::doInitialization(Module &M) {
644 bool Result = AsmPrinter::doInitialization(M);
646 // Emit initial debug information.
647 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
649 DW = getAnalysisIfAvailable<DwarfWriter>();
650 assert(DW && "DwarfWriter is not available");
651 DW->BeginModule(&M, MMI, O, this, TAI);
653 // GNU as handles section names wrapped in quotes
654 Mang->setUseQuotes(true);
656 SwitchToSection(TAI->getTextSection());
661 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
662 /// Don't print things like \\n or \\0.
663 static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
664 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
670 void PPCLinuxAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
671 const TargetData *TD = TM.getTargetData();
673 if (!GVar->hasInitializer())
674 return; // External global require no code
676 // Check to see if this is a special global used by LLVM, if so, emit it.
677 if (EmitSpecialLLVMGlobal(GVar))
680 std::string name = Mang->getValueName(GVar);
682 printVisibility(name, GVar->getVisibility());
684 Constant *C = GVar->getInitializer();
685 const Type *Type = C->getType();
686 unsigned Size = TD->getTypePaddedSize(Type);
687 unsigned Align = TD->getPreferredAlignmentLog(GVar);
689 SwitchToSection(TAI->SectionForGlobal(GVar));
691 if (C->isNullValue() && /* FIXME: Verify correct */
692 !GVar->hasSection() &&
693 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
694 GVar->isWeakForLinker())) {
695 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
697 if (GVar->hasExternalLinkage()) {
698 O << "\t.global " << name << '\n';
699 O << "\t.type " << name << ", @object\n";
701 O << "\t.zero " << Size << '\n';
702 } else if (GVar->hasLocalLinkage()) {
703 O << TAI->getLCOMMDirective() << name << ',' << Size;
705 O << ".comm " << name << ',' << Size;
707 O << "\t\t" << TAI->getCommentString() << " '";
708 PrintUnmangledNameSafely(GVar, O);
713 switch (GVar->getLinkage()) {
714 case GlobalValue::LinkOnceAnyLinkage:
715 case GlobalValue::LinkOnceODRLinkage:
716 case GlobalValue::WeakAnyLinkage:
717 case GlobalValue::WeakODRLinkage:
718 case GlobalValue::CommonLinkage:
719 O << "\t.global " << name << '\n'
720 << "\t.type " << name << ", @object\n"
721 << "\t.weak " << name << '\n';
723 case GlobalValue::AppendingLinkage:
724 // FIXME: appending linkage variables should go into a section of
725 // their name or something. For now, just emit them as external.
726 case GlobalValue::ExternalLinkage:
727 // If external or appending, declare as a global symbol
728 O << "\t.global " << name << '\n'
729 << "\t.type " << name << ", @object\n";
731 case GlobalValue::InternalLinkage:
732 case GlobalValue::PrivateLinkage:
735 cerr << "Unknown linkage type!";
739 EmitAlignment(Align, GVar);
740 O << name << ":\t\t\t\t" << TAI->getCommentString() << " '";
741 PrintUnmangledNameSafely(GVar, O);
744 // If the initializer is a extern weak symbol, remember to emit the weak
746 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
747 if (GV->hasExternalWeakLinkage())
748 ExtWeakSymbols.insert(GV);
750 EmitGlobalConstant(C);
754 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
755 // Print out module-level global variables here.
756 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
758 printModuleLevelGV(I);
762 // Emit initial debug information.
765 return AsmPrinter::doFinalization(M);
768 /// runOnMachineFunction - This uses the printMachineInstruction()
769 /// method to print assembly for each instruction.
771 bool PPCDarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
774 SetupMachineFunction(MF);
777 // Print out constants referenced by the function
778 EmitConstantPool(MF.getConstantPool());
780 // Print out labels for the function.
781 const Function *F = MF.getFunction();
782 SwitchToSection(TAI->SectionForGlobal(F));
784 switch (F->getLinkage()) {
785 default: assert(0 && "Unknown linkage type!");
786 case Function::PrivateLinkage:
787 case Function::InternalLinkage: // Symbols default to internal.
789 case Function::ExternalLinkage:
790 O << "\t.globl\t" << CurrentFnName << '\n';
792 case Function::WeakAnyLinkage:
793 case Function::WeakODRLinkage:
794 case Function::LinkOnceAnyLinkage:
795 case Function::LinkOnceODRLinkage:
796 O << "\t.globl\t" << CurrentFnName << '\n';
797 O << "\t.weak_definition\t" << CurrentFnName << '\n';
801 printVisibility(CurrentFnName, F->getVisibility());
803 EmitAlignment(F->hasFnAttr(Attribute::OptimizeForSize) ? 2 : 4, F);
804 O << CurrentFnName << ":\n";
806 // Emit pre-function debug information.
807 DW->BeginFunction(&MF);
809 // If the function is empty, then we need to emit *something*. Otherwise, the
810 // function's label might be associated with something that it wasn't meant to
811 // be associated with. We emit a noop in this situation.
812 MachineFunction::iterator I = MF.begin();
814 if (++I == MF.end() && MF.front().empty())
817 // Print out code for the function.
818 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
820 // Print a label for the basic block.
821 if (I != MF.begin()) {
822 printBasicBlockLabel(I, true, true);
825 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
827 // Print the assembly for the instruction.
828 printMachineInstruction(II);
832 // Print out jump tables referenced by the function.
833 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
835 // Emit post-function debug information.
836 DW->EndFunction(&MF);
838 // We didn't modify anything.
843 bool PPCDarwinAsmPrinter::doInitialization(Module &M) {
844 static const char *const CPUDirectives[] = {
856 unsigned Directive = Subtarget.getDarwinDirective();
857 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
858 Directive = PPC::DIR_970;
859 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
860 Directive = PPC::DIR_7400;
861 if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
862 Directive = PPC::DIR_64;
863 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
864 O << "\t.machine " << CPUDirectives[Directive] << '\n';
866 bool Result = AsmPrinter::doInitialization(M);
868 // Emit initial debug information.
869 // We need this for Personality functions.
870 // AsmPrinter::doInitialization should have done this analysis.
871 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
873 DW = getAnalysisIfAvailable<DwarfWriter>();
874 assert(DW && "DwarfWriter is not available");
875 DW->BeginModule(&M, MMI, O, this, TAI);
877 // Darwin wants symbols to be quoted if they have complex names.
878 Mang->setUseQuotes(true);
880 // Prime text sections so they are adjacent. This reduces the likelihood a
881 // large data or debug section causes a branch to exceed 16M limit.
882 SwitchToTextSection("\t.section __TEXT,__textcoal_nt,coalesced,"
883 "pure_instructions");
884 if (TM.getRelocationModel() == Reloc::PIC_) {
885 SwitchToTextSection("\t.section __TEXT,__picsymbolstub1,symbol_stubs,"
886 "pure_instructions,32");
887 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
888 SwitchToTextSection("\t.section __TEXT,__symbol_stub1,symbol_stubs,"
889 "pure_instructions,16");
891 SwitchToSection(TAI->getTextSection());
896 void PPCDarwinAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
897 const TargetData *TD = TM.getTargetData();
899 if (!GVar->hasInitializer())
900 return; // External global require no code
902 // Check to see if this is a special global used by LLVM, if so, emit it.
903 if (EmitSpecialLLVMGlobal(GVar)) {
904 if (TM.getRelocationModel() == Reloc::Static) {
905 if (GVar->getName() == "llvm.global_ctors")
906 O << ".reference .constructors_used\n";
907 else if (GVar->getName() == "llvm.global_dtors")
908 O << ".reference .destructors_used\n";
913 std::string name = Mang->getValueName(GVar);
915 printVisibility(name, GVar->getVisibility());
917 Constant *C = GVar->getInitializer();
918 const Type *Type = C->getType();
919 unsigned Size = TD->getTypePaddedSize(Type);
920 unsigned Align = TD->getPreferredAlignmentLog(GVar);
922 SwitchToSection(TAI->SectionForGlobal(GVar));
924 if (C->isNullValue() && /* FIXME: Verify correct */
925 !GVar->hasSection() &&
926 (GVar->hasLocalLinkage() || GVar->hasExternalLinkage() ||
927 GVar->isWeakForLinker()) &&
928 TAI->SectionKindForGlobal(GVar) != SectionKind::RODataMergeStr) {
929 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
931 if (GVar->hasExternalLinkage()) {
932 O << "\t.globl " << name << '\n';
933 O << "\t.zerofill __DATA, __common, " << name << ", "
934 << Size << ", " << Align;
935 } else if (GVar->hasLocalLinkage()) {
936 O << TAI->getLCOMMDirective() << name << ',' << Size << ',' << Align;
937 } else if (!GVar->hasCommonLinkage()) {
938 O << "\t.globl " << name << '\n'
939 << TAI->getWeakDefDirective() << name << '\n';
940 EmitAlignment(Align, GVar);
941 O << name << ":\t\t\t\t" << TAI->getCommentString() << " ";
942 PrintUnmangledNameSafely(GVar, O);
944 EmitGlobalConstant(C);
947 O << ".comm " << name << ',' << Size;
948 // Darwin 9 and above support aligned common data.
949 if (Subtarget.isDarwin9())
952 O << "\t\t" << TAI->getCommentString() << " '";
953 PrintUnmangledNameSafely(GVar, O);
958 switch (GVar->getLinkage()) {
959 case GlobalValue::LinkOnceAnyLinkage:
960 case GlobalValue::LinkOnceODRLinkage:
961 case GlobalValue::WeakAnyLinkage:
962 case GlobalValue::WeakODRLinkage:
963 case GlobalValue::CommonLinkage:
964 O << "\t.globl " << name << '\n'
965 << "\t.weak_definition " << name << '\n';
967 case GlobalValue::AppendingLinkage:
968 // FIXME: appending linkage variables should go into a section of
969 // their name or something. For now, just emit them as external.
970 case GlobalValue::ExternalLinkage:
971 // If external or appending, declare as a global symbol
972 O << "\t.globl " << name << '\n';
974 case GlobalValue::InternalLinkage:
975 case GlobalValue::PrivateLinkage:
978 cerr << "Unknown linkage type!";
982 EmitAlignment(Align, GVar);
983 O << name << ":\t\t\t\t" << TAI->getCommentString() << " '";
984 PrintUnmangledNameSafely(GVar, O);
987 // If the initializer is a extern weak symbol, remember to emit the weak
989 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
990 if (GV->hasExternalWeakLinkage())
991 ExtWeakSymbols.insert(GV);
993 EmitGlobalConstant(C);
997 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
998 const TargetData *TD = TM.getTargetData();
1000 // Print out module-level global variables here.
1001 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
1003 printModuleLevelGV(I);
1005 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1007 // Output stubs for dynamically-linked functions
1008 if (TM.getRelocationModel() == Reloc::PIC_) {
1009 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
1011 SwitchToTextSection("\t.section __TEXT,__picsymbolstub1,symbol_stubs,"
1012 "pure_instructions,32");
1014 const char *p = i->getKeyData();
1015 bool hasQuote = p[0]=='\"';
1016 printSuffixedName(p, "$stub");
1018 O << "\t.indirect_symbol " << p << '\n';
1020 O << "\tbcl 20,31,";
1022 O << "\"L0$" << &p[1];
1027 O << "\"L0$" << &p[1];
1031 O << "\tmflr r11\n";
1032 O << "\taddis r11,r11,ha16(";
1033 printSuffixedName(p, "$lazy_ptr");
1036 O << "\"L0$" << &p[1];
1042 O << "\tldu r12,lo16(";
1044 O << "\tlwzu r12,lo16(";
1045 printSuffixedName(p, "$lazy_ptr");
1048 O << "\"L0$" << &p[1];
1052 O << "\tmtctr r12\n";
1054 SwitchToDataSection(".lazy_symbol_pointer");
1055 printSuffixedName(p, "$lazy_ptr");
1057 O << "\t.indirect_symbol " << p << '\n';
1059 O << "\t.quad dyld_stub_binding_helper\n";
1061 O << "\t.long dyld_stub_binding_helper\n";
1064 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
1066 SwitchToTextSection("\t.section __TEXT,__symbol_stub1,symbol_stubs,"
1067 "pure_instructions,16");
1069 const char *p = i->getKeyData();
1070 printSuffixedName(p, "$stub");
1072 O << "\t.indirect_symbol " << p << '\n';
1073 O << "\tlis r11,ha16(";
1074 printSuffixedName(p, "$lazy_ptr");
1077 O << "\tldu r12,lo16(";
1079 O << "\tlwzu r12,lo16(";
1080 printSuffixedName(p, "$lazy_ptr");
1082 O << "\tmtctr r12\n";
1084 SwitchToDataSection(".lazy_symbol_pointer");
1085 printSuffixedName(p, "$lazy_ptr");
1087 O << "\t.indirect_symbol " << p << '\n';
1089 O << "\t.quad dyld_stub_binding_helper\n";
1091 O << "\t.long dyld_stub_binding_helper\n";
1097 if (TAI->doesSupportExceptionHandling() && MMI) {
1098 // Add the (possibly multiple) personalities to the set of global values.
1099 // Only referenced functions get into the Personalities list.
1100 const std::vector<Function *>& Personalities = MMI->getPersonalities();
1102 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1103 E = Personalities.end(); I != E; ++I)
1104 if (*I) GVStubs.insert("_" + (*I)->getName());
1107 // Output stubs for external and common global variables.
1108 if (!GVStubs.empty()) {
1109 SwitchToDataSection(".non_lazy_symbol_pointer");
1110 for (StringSet<>::iterator i = GVStubs.begin(), e = GVStubs.end();
1112 std::string p = i->getKeyData();
1113 printSuffixedName(p, "$non_lazy_ptr");
1115 O << "\t.indirect_symbol " << p << '\n';
1117 O << "\t.quad\t0\n";
1119 O << "\t.long\t0\n";
1123 if (!HiddenGVStubs.empty()) {
1124 SwitchToSection(TAI->getDataSection());
1125 for (StringSet<>::iterator i = HiddenGVStubs.begin(), e = HiddenGVStubs.end();
1127 std::string p = i->getKeyData();
1128 EmitAlignment(isPPC64 ? 3 : 2);
1129 printSuffixedName(p, "$non_lazy_ptr");
1140 // Emit initial debug information.
1143 // Funny Darwin hack: This flag tells the linker that no global symbols
1144 // contain code that falls through to other global symbols (e.g. the obvious
1145 // implementation of multiple entry points). If this doesn't occur, the
1146 // linker can safely perform dead code stripping. Since LLVM never generates
1147 // code that does this, it is always safe to set.
1148 O << "\t.subsections_via_symbols\n";
1150 return AsmPrinter::doFinalization(M);
1155 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1156 /// for a MachineFunction to the given output stream, in a format that the
1157 /// Darwin assembler can deal with.
1159 FunctionPass *llvm::createPPCAsmPrinterPass(raw_ostream &o,
1160 PPCTargetMachine &tm,
1162 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1164 if (Subtarget->isDarwin()) {
1165 return new PPCDarwinAsmPrinter(o, tm, tm.getTargetAsmInfo(), fast);
1167 return new PPCLinuxAsmPrinter(o, tm, tm.getTargetAsmInfo(), fast);
1172 static struct Register {
1174 PPCTargetMachine::registerAsmPrinter(createPPCAsmPrinterPass);
1179 extern "C" int PowerPCAsmPrinterForceLink;
1180 int PowerPCAsmPrinterForceLink = 0;