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/Target/TargetAsmInfo.h"
40 #include "llvm/Target/TargetRegisterInfo.h"
41 #include "llvm/Target/TargetInstrInfo.h"
42 #include "llvm/Target/TargetOptions.h"
43 #include "llvm/ADT/Statistic.h"
44 #include "llvm/ADT/StringExtras.h"
48 STATISTIC(EmittedInsts, "Number of machine instrs printed");
51 struct VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter {
52 std::set<std::string> FnStubs, GVStubs;
53 const PPCSubtarget &Subtarget;
55 PPCAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
56 : AsmPrinter(O, TM, T), Subtarget(TM.getSubtarget<PPCSubtarget>()) {
59 virtual const char *getPassName() const {
60 return "PowerPC Assembly Printer";
63 PPCTargetMachine &getTM() {
64 return static_cast<PPCTargetMachine&>(TM);
67 unsigned enumRegToMachineReg(unsigned enumReg) {
69 default: assert(0 && "Unhandled register!"); break;
70 case PPC::CR0: return 0;
71 case PPC::CR1: return 1;
72 case PPC::CR2: return 2;
73 case PPC::CR3: return 3;
74 case PPC::CR4: return 4;
75 case PPC::CR5: return 5;
76 case PPC::CR6: return 6;
77 case PPC::CR7: return 7;
82 /// printInstruction - This method is automatically generated by tablegen
83 /// from the instruction set description. This method returns true if the
84 /// machine instruction was sufficiently described to print it, otherwise it
86 bool printInstruction(const MachineInstr *MI);
88 void printMachineInstruction(const MachineInstr *MI);
89 void printOp(const MachineOperand &MO);
91 /// stripRegisterPrefix - This method strips the character prefix from a
92 /// register name so that only the number is left. Used by for linux asm.
93 const char *stripRegisterPrefix(const char *RegName) {
97 case 'v': return RegName + 1;
98 case 'c': if (RegName[1] == 'r') return RegName + 2;
104 /// printRegister - Print register according to target requirements.
106 void printRegister(const MachineOperand &MO, bool R0AsZero) {
107 unsigned RegNo = MO.getReg();
108 assert(TargetRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??");
110 // If we should use 0 for R0.
111 if (R0AsZero && RegNo == PPC::R0) {
116 const char *RegName = TM.getRegisterInfo()->get(RegNo).AsmName;
117 // Linux assembler (Others?) does not take register mnemonics.
118 // FIXME - What about special registers used in mfspr/mtspr?
119 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
123 void printOperand(const MachineInstr *MI, unsigned OpNo) {
124 const MachineOperand &MO = MI->getOperand(OpNo);
125 if (MO.isRegister()) {
126 printRegister(MO, false);
127 } else if (MO.isImmediate()) {
134 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
135 unsigned AsmVariant, const char *ExtraCode);
136 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
137 unsigned AsmVariant, const char *ExtraCode);
140 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
141 char value = MI->getOperand(OpNo).getImm();
142 value = (value << (32-5)) >> (32-5);
145 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
146 unsigned char value = MI->getOperand(OpNo).getImm();
147 assert(value <= 31 && "Invalid u5imm argument!");
148 O << (unsigned int)value;
150 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) {
151 unsigned char value = MI->getOperand(OpNo).getImm();
152 assert(value <= 63 && "Invalid u6imm argument!");
153 O << (unsigned int)value;
155 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
156 O << (short)MI->getOperand(OpNo).getImm();
158 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
159 O << (unsigned short)MI->getOperand(OpNo).getImm();
161 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
162 if (MI->getOperand(OpNo).isImmediate()) {
163 O << (short)(MI->getOperand(OpNo).getImm()*4);
166 printOp(MI->getOperand(OpNo));
167 if (TM.getRelocationModel() == Reloc::PIC_)
168 O << "-\"L" << getFunctionNumber() << "$pb\")";
173 void printBranchOperand(const MachineInstr *MI, unsigned OpNo) {
174 // Branches can take an immediate operand. This is used by the branch
175 // selection pass to print $+8, an eight byte displacement from the PC.
176 if (MI->getOperand(OpNo).isImmediate()) {
177 O << "$+" << MI->getOperand(OpNo).getImm()*4;
179 printOp(MI->getOperand(OpNo));
182 void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
183 const MachineOperand &MO = MI->getOperand(OpNo);
184 if (TM.getRelocationModel() != Reloc::Static) {
185 if (MO.getType() == MachineOperand::MO_GlobalAddress) {
186 GlobalValue *GV = MO.getGlobal();
187 if (((GV->isDeclaration() || GV->hasWeakLinkage() ||
188 GV->hasLinkOnceLinkage() || GV->hasCommonLinkage()))) {
189 // Dynamically-resolved functions need a stub for the function.
190 std::string Name = Mang->getValueName(GV);
191 FnStubs.insert(Name);
192 printSuffixedName(Name, "$stub");
193 if (GV->hasExternalWeakLinkage())
194 ExtWeakSymbols.insert(GV);
198 if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
199 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName();
200 FnStubs.insert(Name);
201 printSuffixedName(Name, "$stub");
206 printOp(MI->getOperand(OpNo));
208 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
209 O << (int)MI->getOperand(OpNo).getImm()*4;
211 void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
212 O << "\"L" << getFunctionNumber() << "$pb\"\n";
213 O << "\"L" << getFunctionNumber() << "$pb\":";
215 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
216 if (MI->getOperand(OpNo).isImmediate()) {
217 printS16ImmOperand(MI, OpNo);
219 if (Subtarget.isDarwin()) O << "ha16(";
220 printOp(MI->getOperand(OpNo));
221 if (TM.getRelocationModel() == Reloc::PIC_)
222 O << "-\"L" << getFunctionNumber() << "$pb\"";
223 if (Subtarget.isDarwin())
229 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
230 if (MI->getOperand(OpNo).isImmediate()) {
231 printS16ImmOperand(MI, OpNo);
233 if (Subtarget.isDarwin()) O << "lo16(";
234 printOp(MI->getOperand(OpNo));
235 if (TM.getRelocationModel() == Reloc::PIC_)
236 O << "-\"L" << getFunctionNumber() << "$pb\"";
237 if (Subtarget.isDarwin())
243 void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
244 unsigned CCReg = MI->getOperand(OpNo).getReg();
245 unsigned RegNo = enumRegToMachineReg(CCReg);
246 O << (0x80 >> RegNo);
248 // The new addressing mode printers.
249 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
250 printSymbolLo(MI, OpNo);
252 if (MI->getOperand(OpNo+1).isRegister() &&
253 MI->getOperand(OpNo+1).getReg() == PPC::R0)
256 printOperand(MI, OpNo+1);
259 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) {
260 if (MI->getOperand(OpNo).isImmediate())
261 printS16X4ImmOperand(MI, OpNo);
263 printSymbolLo(MI, OpNo);
265 if (MI->getOperand(OpNo+1).isRegister() &&
266 MI->getOperand(OpNo+1).getReg() == PPC::R0)
269 printOperand(MI, OpNo+1);
273 void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
274 // When used as the base register, r0 reads constant zero rather than
275 // the value contained in the register. For this reason, the darwin
276 // assembler requires that we print r0 as 0 (no r) when used as the base.
277 const MachineOperand &MO = MI->getOperand(OpNo);
278 printRegister(MO, true);
280 printOperand(MI, OpNo+1);
283 void printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
284 const char *Modifier);
286 virtual bool runOnMachineFunction(MachineFunction &F) = 0;
287 virtual bool doFinalization(Module &M) = 0;
289 virtual void EmitExternalGlobal(const GlobalVariable *GV);
292 /// PPCLinuxAsmPrinter - PowerPC assembly printer, customized for Linux
293 struct VISIBILITY_HIDDEN PPCLinuxAsmPrinter : public PPCAsmPrinter {
296 MachineModuleInfo *MMI;
298 PPCLinuxAsmPrinter(std::ostream &O, PPCTargetMachine &TM,
299 const TargetAsmInfo *T)
300 : PPCAsmPrinter(O, TM, T), DW(O, this, T), MMI(0) {
303 virtual const char *getPassName() const {
304 return "Linux PPC Assembly Printer";
307 bool runOnMachineFunction(MachineFunction &F);
308 bool doInitialization(Module &M);
309 bool doFinalization(Module &M);
311 void getAnalysisUsage(AnalysisUsage &AU) const {
312 AU.setPreservesAll();
313 AU.addRequired<MachineModuleInfo>();
314 PPCAsmPrinter::getAnalysisUsage(AU);
317 /// getSectionForFunction - Return the section that we should emit the
318 /// specified function body into.
319 virtual std::string getSectionForFunction(const Function &F) const;
320 void printModuleLevelGV(const GlobalVariable* GVar);
323 /// PPCDarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac
325 struct VISIBILITY_HIDDEN PPCDarwinAsmPrinter : public PPCAsmPrinter {
328 MachineModuleInfo *MMI;
330 PPCDarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM,
331 const TargetAsmInfo *T)
332 : PPCAsmPrinter(O, TM, T), DW(O, this, T), MMI(0) {
335 virtual const char *getPassName() const {
336 return "Darwin PPC Assembly Printer";
339 bool runOnMachineFunction(MachineFunction &F);
340 bool doInitialization(Module &M);
341 bool doFinalization(Module &M);
343 void getAnalysisUsage(AnalysisUsage &AU) const {
344 AU.setPreservesAll();
345 AU.addRequired<MachineModuleInfo>();
346 PPCAsmPrinter::getAnalysisUsage(AU);
349 /// getSectionForFunction - Return the section that we should emit the
350 /// specified function body into.
351 virtual std::string getSectionForFunction(const Function &F) const;
352 void printModuleLevelGV(const GlobalVariable* GVar);
354 } // end of anonymous namespace
356 // Include the auto-generated portion of the assembly writer
357 #include "PPCGenAsmWriter.inc"
359 void PPCAsmPrinter::printOp(const MachineOperand &MO) {
360 switch (MO.getType()) {
361 case MachineOperand::MO_Immediate:
362 cerr << "printOp() does not handle immediate values\n";
366 case MachineOperand::MO_MachineBasicBlock:
367 printBasicBlockLabel(MO.getMBB());
369 case MachineOperand::MO_JumpTableIndex:
370 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
371 << '_' << MO.getIndex();
372 // FIXME: PIC relocation model
374 case MachineOperand::MO_ConstantPoolIndex:
375 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
376 << '_' << MO.getIndex();
378 case MachineOperand::MO_ExternalSymbol:
379 // Computing the address of an external symbol, not calling it.
380 if (TM.getRelocationModel() != Reloc::Static) {
381 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName();
382 GVStubs.insert(Name);
383 printSuffixedName(Name, "$non_lazy_ptr");
386 O << TAI->getGlobalPrefix() << MO.getSymbolName();
388 case MachineOperand::MO_GlobalAddress: {
389 // Computing the address of a global symbol, not calling it.
390 GlobalValue *GV = MO.getGlobal();
391 std::string Name = Mang->getValueName(GV);
393 // External or weakly linked global variables need non-lazily-resolved stubs
394 if (TM.getRelocationModel() != Reloc::Static) {
395 if (((GV->isDeclaration() || GV->hasWeakLinkage() ||
396 GV->hasLinkOnceLinkage() || GV->hasCommonLinkage()))) {
397 GVStubs.insert(Name);
398 printSuffixedName(Name, "$non_lazy_ptr");
399 if (GV->hasExternalWeakLinkage())
400 ExtWeakSymbols.insert(GV);
406 if (MO.getOffset() > 0)
407 O << "+" << MO.getOffset();
408 else if (MO.getOffset() < 0)
411 if (GV->hasExternalWeakLinkage())
412 ExtWeakSymbols.insert(GV);
417 O << "<unknown operand type: " << MO.getType() << ">";
422 /// EmitExternalGlobal - In this case we need to use the indirect symbol.
424 void PPCAsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
425 std::string Name = getGlobalLinkName(GV);
426 if (TM.getRelocationModel() != Reloc::Static) {
427 GVStubs.insert(Name);
428 printSuffixedName(Name, "$non_lazy_ptr");
434 /// PrintAsmOperand - Print out an operand for an inline asm expression.
436 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
438 const char *ExtraCode) {
439 // Does this asm operand have a single letter operand modifier?
440 if (ExtraCode && ExtraCode[0]) {
441 if (ExtraCode[1] != 0) return true; // Unknown modifier.
443 switch (ExtraCode[0]) {
444 default: return true; // Unknown modifier.
445 case 'c': // Don't print "$" before a global var name or constant.
446 // PPC never has a prefix.
447 printOperand(MI, OpNo);
449 case 'L': // Write second word of DImode reference.
450 // Verify that this operand has two consecutive registers.
451 if (!MI->getOperand(OpNo).isRegister() ||
452 OpNo+1 == MI->getNumOperands() ||
453 !MI->getOperand(OpNo+1).isRegister())
455 ++OpNo; // Return the high-part.
458 // Write 'i' if an integer constant, otherwise nothing. Used to print
460 if (MI->getOperand(OpNo).isImmediate())
466 printOperand(MI, OpNo);
470 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
472 const char *ExtraCode) {
473 if (ExtraCode && ExtraCode[0])
474 return true; // Unknown modifier.
475 if (MI->getOperand(OpNo).isRegister())
476 printMemRegReg(MI, OpNo);
478 printMemRegImm(MI, OpNo);
482 void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
483 const char *Modifier) {
484 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
485 unsigned Code = MI->getOperand(OpNo).getImm();
486 if (!strcmp(Modifier, "cc")) {
487 switch ((PPC::Predicate)Code) {
488 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
489 case PPC::PRED_LT: O << "lt"; return;
490 case PPC::PRED_LE: O << "le"; return;
491 case PPC::PRED_EQ: O << "eq"; return;
492 case PPC::PRED_GE: O << "ge"; return;
493 case PPC::PRED_GT: O << "gt"; return;
494 case PPC::PRED_NE: O << "ne"; return;
495 case PPC::PRED_UN: O << "un"; return;
496 case PPC::PRED_NU: O << "nu"; return;
500 assert(!strcmp(Modifier, "reg") &&
501 "Need to specify 'cc' or 'reg' as predicate op modifier!");
502 // Don't print the register for 'always'.
503 if (Code == PPC::PRED_ALWAYS) return;
504 printOperand(MI, OpNo+1);
509 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
510 /// the current output stream.
512 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
515 // Check for slwi/srwi mnemonics.
516 if (MI->getOpcode() == PPC::RLWINM) {
517 bool FoundMnemonic = false;
518 unsigned char SH = MI->getOperand(2).getImm();
519 unsigned char MB = MI->getOperand(3).getImm();
520 unsigned char ME = MI->getOperand(4).getImm();
521 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
522 O << "\tslwi "; FoundMnemonic = true;
524 if (SH <= 31 && MB == (32-SH) && ME == 31) {
525 O << "\tsrwi "; FoundMnemonic = true;
532 O << ", " << (unsigned int)SH << '\n';
535 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
536 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
544 } else if (MI->getOpcode() == PPC::RLDICR) {
545 unsigned char SH = MI->getOperand(2).getImm();
546 unsigned char ME = MI->getOperand(3).getImm();
547 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
553 O << ", " << (unsigned int)SH << '\n';
558 if (printInstruction(MI))
559 return; // Printer was automatically generated
561 assert(0 && "Unhandled instruction in asm writer!");
566 /// runOnMachineFunction - This uses the printMachineInstruction()
567 /// method to print assembly for each instruction.
569 bool PPCLinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
571 SetupMachineFunction(MF);
574 // Print out constants referenced by the function
575 EmitConstantPool(MF.getConstantPool());
577 // Print out labels for the function.
578 const Function *F = MF.getFunction();
579 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
581 switch (F->getLinkage()) {
582 default: assert(0 && "Unknown linkage type!");
583 case Function::InternalLinkage: // Symbols default to internal.
585 case Function::ExternalLinkage:
586 O << "\t.global\t" << CurrentFnName << '\n'
587 << "\t.type\t" << CurrentFnName << ", @function\n";
589 case Function::WeakLinkage:
590 case Function::LinkOnceLinkage:
591 O << "\t.global\t" << CurrentFnName << '\n';
592 O << "\t.weak\t" << CurrentFnName << '\n';
596 printVisibility(CurrentFnName, F->getVisibility());
599 O << CurrentFnName << ":\n";
601 // Emit pre-function debug information.
602 DW.BeginFunction(&MF);
604 // Print out code for the function.
605 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
607 // Print a label for the basic block.
608 if (I != MF.begin()) {
609 printBasicBlockLabel(I, true, true);
612 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
614 // Print the assembly for the instruction.
615 printMachineInstruction(II);
619 O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << '\n';
621 // Print out jump tables referenced by the function.
622 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
624 // Emit post-function debug information.
627 // We didn't modify anything.
631 bool PPCLinuxAsmPrinter::doInitialization(Module &M) {
632 bool Result = AsmPrinter::doInitialization(M);
634 // Emit initial debug information.
637 // AsmPrinter::doInitialization should have done this analysis.
638 MMI = getAnalysisToUpdate<MachineModuleInfo>();
640 DW.SetModuleInfo(MMI);
642 // GNU as handles section names wrapped in quotes
643 Mang->setUseQuotes(true);
645 SwitchToTextSection(TAI->getTextSection());
650 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
651 /// Don't print things like \n or \0.
652 static void PrintUnmangledNameSafely(const Value *V, std::ostream &OS) {
653 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
659 void PPCLinuxAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
660 const TargetData *TD = TM.getTargetData();
662 if (!GVar->hasInitializer())
663 return; // External global require no code
665 // Check to see if this is a special global used by LLVM, if so, emit it.
666 if (EmitSpecialLLVMGlobal(GVar))
669 std::string name = Mang->getValueName(GVar);
670 std::string SectionName = TAI->SectionForGlobal(GVar);
672 printVisibility(name, GVar->getVisibility());
674 Constant *C = GVar->getInitializer();
675 const Type *Type = C->getType();
676 unsigned Size = TD->getABITypeSize(Type);
677 unsigned Align = TD->getPreferredAlignmentLog(GVar);
679 SwitchToDataSection(SectionName.c_str());
681 if (C->isNullValue() && /* FIXME: Verify correct */
682 !GVar->hasSection() &&
683 (GVar->hasInternalLinkage() || GVar->hasExternalLinkage() ||
684 GVar->isWeakForLinker())) {
685 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
687 if (GVar->hasExternalLinkage()) {
688 O << "\t.global " << name << '\n';
689 O << "\t.type " << name << ", @object\n";
691 O << "\t.zero " << Size << '\n';
692 } else if (GVar->hasInternalLinkage()) {
693 O << TAI->getLCOMMDirective() << name << ',' << Size;
695 O << ".comm " << name << ',' << Size;
697 O << "\t\t" << TAI->getCommentString() << " '";
698 PrintUnmangledNameSafely(GVar, O);
703 switch (GVar->getLinkage()) {
704 case GlobalValue::LinkOnceLinkage:
705 case GlobalValue::WeakLinkage:
706 case GlobalValue::CommonLinkage:
707 O << "\t.global " << name << '\n'
708 << "\t.type " << name << ", @object\n"
709 << "\t.weak " << name << '\n';
711 case GlobalValue::AppendingLinkage:
712 // FIXME: appending linkage variables should go into a section of
713 // their name or something. For now, just emit them as external.
714 case GlobalValue::ExternalLinkage:
715 // If external or appending, declare as a global symbol
716 O << "\t.global " << name << '\n'
717 << "\t.type " << name << ", @object\n";
719 case GlobalValue::InternalLinkage:
722 cerr << "Unknown linkage type!";
726 EmitAlignment(Align, GVar);
727 O << name << ":\t\t\t\t" << TAI->getCommentString() << " '";
728 PrintUnmangledNameSafely(GVar, O);
731 // If the initializer is a extern weak symbol, remember to emit the weak
733 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
734 if (GV->hasExternalWeakLinkage())
735 ExtWeakSymbols.insert(GV);
737 EmitGlobalConstant(C);
741 bool PPCLinuxAsmPrinter::doFinalization(Module &M) {
742 // Print out module-level global variables here.
743 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
745 printModuleLevelGV(I);
749 // Emit initial debug information.
752 return AsmPrinter::doFinalization(M);
755 std::string PPCLinuxAsmPrinter::getSectionForFunction(const Function &F) const {
756 return TAI->SectionForGlobal(&F);
759 std::string PPCDarwinAsmPrinter::getSectionForFunction(const Function &F) const {
760 return TAI->SectionForGlobal(&F);
763 /// runOnMachineFunction - This uses the printMachineInstruction()
764 /// method to print assembly for each instruction.
766 bool PPCDarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
767 SetupMachineFunction(MF);
770 // Print out constants referenced by the function
771 EmitConstantPool(MF.getConstantPool());
773 // Print out labels for the function.
774 const Function *F = MF.getFunction();
775 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
777 switch (F->getLinkage()) {
778 default: assert(0 && "Unknown linkage type!");
779 case Function::InternalLinkage: // Symbols default to internal.
781 case Function::ExternalLinkage:
782 O << "\t.globl\t" << CurrentFnName << '\n';
784 case Function::WeakLinkage:
785 case Function::LinkOnceLinkage:
786 O << "\t.globl\t" << CurrentFnName << '\n';
787 O << "\t.weak_definition\t" << CurrentFnName << '\n';
791 printVisibility(CurrentFnName, F->getVisibility());
793 EmitAlignment(OptimizeForSize ? 2 : 4, F);
794 O << CurrentFnName << ":\n";
796 // Emit pre-function debug information.
797 DW.BeginFunction(&MF);
799 // If the function is empty, then we need to emit *something*. Otherwise, the
800 // function's label might be associated with something that it wasn't meant to
801 // be associated with. We emit a noop in this situation.
802 MachineFunction::iterator I = MF.begin();
804 if (++I == MF.end() && MF.front().empty())
807 // Print out code for the function.
808 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
810 // Print a label for the basic block.
811 if (I != MF.begin()) {
812 printBasicBlockLabel(I, true, true);
815 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
817 // Print the assembly for the instruction.
818 printMachineInstruction(II);
822 // Print out jump tables referenced by the function.
823 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
825 // Emit post-function debug information.
828 // We didn't modify anything.
833 bool PPCDarwinAsmPrinter::doInitialization(Module &M) {
834 static const char *const CPUDirectives[] = {
846 unsigned Directive = Subtarget.getDarwinDirective();
847 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
848 Directive = PPC::DIR_970;
849 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
850 Directive = PPC::DIR_7400;
851 if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
852 Directive = PPC::DIR_64;
853 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
854 O << "\t.machine " << CPUDirectives[Directive] << '\n';
856 bool Result = AsmPrinter::doInitialization(M);
858 // Emit initial debug information.
861 // We need this for Personality functions.
862 // AsmPrinter::doInitialization should have done this analysis.
863 MMI = getAnalysisToUpdate<MachineModuleInfo>();
865 DW.SetModuleInfo(MMI);
867 // Darwin wants symbols to be quoted if they have complex names.
868 Mang->setUseQuotes(true);
870 // Prime text sections so they are adjacent. This reduces the likelihood a
871 // large data or debug section causes a branch to exceed 16M limit.
872 SwitchToTextSection("\t.section __TEXT,__textcoal_nt,coalesced,"
873 "pure_instructions");
874 if (TM.getRelocationModel() == Reloc::PIC_) {
875 SwitchToTextSection("\t.section __TEXT,__picsymbolstub1,symbol_stubs,"
876 "pure_instructions,32");
877 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
878 SwitchToTextSection("\t.section __TEXT,__symbol_stub1,symbol_stubs,"
879 "pure_instructions,16");
881 SwitchToTextSection(TAI->getTextSection());
886 void PPCDarwinAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
887 const TargetData *TD = TM.getTargetData();
889 if (!GVar->hasInitializer())
890 return; // External global require no code
892 // Check to see if this is a special global used by LLVM, if so, emit it.
893 if (EmitSpecialLLVMGlobal(GVar)) {
894 if (TM.getRelocationModel() == Reloc::Static) {
895 if (GVar->getName() == "llvm.global_ctors")
896 O << ".reference .constructors_used\n";
897 else if (GVar->getName() == "llvm.global_dtors")
898 O << ".reference .destructors_used\n";
903 std::string name = Mang->getValueName(GVar);
904 std::string SectionName = TAI->SectionForGlobal(GVar);
906 printVisibility(name, GVar->getVisibility());
908 Constant *C = GVar->getInitializer();
909 const Type *Type = C->getType();
910 unsigned Size = TD->getABITypeSize(Type);
911 unsigned Align = TD->getPreferredAlignmentLog(GVar);
913 SwitchToDataSection(SectionName.c_str());
915 if (C->isNullValue() && /* FIXME: Verify correct */
916 !GVar->hasSection() &&
917 (GVar->hasInternalLinkage() || GVar->hasExternalLinkage() ||
918 GVar->isWeakForLinker())) {
919 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
921 if (GVar->hasExternalLinkage()) {
922 O << "\t.globl " << name << '\n';
923 O << "\t.zerofill __DATA, __common, " << name << ", "
924 << Size << ", " << Align;
925 } else if (GVar->hasInternalLinkage()) {
926 O << TAI->getLCOMMDirective() << name << ',' << Size << ',' << Align;
927 } else if (!GVar->hasCommonLinkage()) {
928 O << "\t.globl " << name << '\n'
929 << TAI->getWeakDefDirective() << name << '\n';
930 EmitAlignment(Align, GVar);
931 O << name << ":\t\t\t\t" << TAI->getCommentString() << " ";
932 PrintUnmangledNameSafely(GVar, O);
934 EmitGlobalConstant(C);
937 O << ".comm " << name << ',' << Size;
938 // Darwin 9 and above support aligned common data.
939 if (Subtarget.isDarwin9())
942 O << "\t\t" << TAI->getCommentString() << " '";
943 PrintUnmangledNameSafely(GVar, O);
948 switch (GVar->getLinkage()) {
949 case GlobalValue::LinkOnceLinkage:
950 case GlobalValue::WeakLinkage:
951 case GlobalValue::CommonLinkage:
952 O << "\t.globl " << name << '\n'
953 << "\t.weak_definition " << name << '\n';
955 case GlobalValue::AppendingLinkage:
956 // FIXME: appending linkage variables should go into a section of
957 // their name or something. For now, just emit them as external.
958 case GlobalValue::ExternalLinkage:
959 // If external or appending, declare as a global symbol
960 O << "\t.globl " << name << '\n';
962 case GlobalValue::InternalLinkage:
965 cerr << "Unknown linkage type!";
969 EmitAlignment(Align, GVar);
970 O << name << ":\t\t\t\t" << TAI->getCommentString() << " '";
971 PrintUnmangledNameSafely(GVar, O);
974 // If the initializer is a extern weak symbol, remember to emit the weak
976 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
977 if (GV->hasExternalWeakLinkage())
978 ExtWeakSymbols.insert(GV);
980 EmitGlobalConstant(C);
984 bool PPCDarwinAsmPrinter::doFinalization(Module &M) {
985 const TargetData *TD = TM.getTargetData();
987 // Print out module-level global variables here.
988 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
990 printModuleLevelGV(I);
992 bool isPPC64 = TD->getPointerSizeInBits() == 64;
994 // Output stubs for dynamically-linked functions
995 if (TM.getRelocationModel() == Reloc::PIC_) {
996 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
998 SwitchToTextSection("\t.section __TEXT,__picsymbolstub1,symbol_stubs,"
999 "pure_instructions,32");
1002 std::string L0p = (p[0]=='\"') ? "\"L0$" + p.substr(1) : "L0$" + p ;
1003 printSuffixedName(p, "$stub");
1005 O << "\t.indirect_symbol " << *i << '\n';
1007 O << "\tbcl 20,31," << L0p << '\n';
1009 O << "\tmflr r11\n";
1010 O << "\taddis r11,r11,ha16(";
1011 printSuffixedName(p, "$lazy_ptr");
1012 O << "-" << L0p << ")\n";
1015 O << "\tldu r12,lo16(";
1017 O << "\tlwzu r12,lo16(";
1018 printSuffixedName(p, "$lazy_ptr");
1019 O << "-" << L0p << ")(r11)\n";
1020 O << "\tmtctr r12\n";
1022 SwitchToDataSection(".lazy_symbol_pointer");
1023 printSuffixedName(p, "$lazy_ptr");
1025 O << "\t.indirect_symbol " << *i << '\n';
1027 O << "\t.quad dyld_stub_binding_helper\n";
1029 O << "\t.long dyld_stub_binding_helper\n";
1032 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
1034 SwitchToTextSection("\t.section __TEXT,__symbol_stub1,symbol_stubs,"
1035 "pure_instructions,16");
1038 printSuffixedName(p, "$stub");
1040 O << "\t.indirect_symbol " << *i << '\n';
1041 O << "\tlis r11,ha16(";
1042 printSuffixedName(p, "$lazy_ptr");
1045 O << "\tldu r12,lo16(";
1047 O << "\tlwzu r12,lo16(";
1048 printSuffixedName(p, "$lazy_ptr");
1050 O << "\tmtctr r12\n";
1052 SwitchToDataSection(".lazy_symbol_pointer");
1053 printSuffixedName(p, "$lazy_ptr");
1055 O << "\t.indirect_symbol " << *i << '\n';
1057 O << "\t.quad dyld_stub_binding_helper\n";
1059 O << "\t.long dyld_stub_binding_helper\n";
1065 if (TAI->doesSupportExceptionHandling() && MMI) {
1066 // Add the (possibly multiple) personalities to the set of global values.
1067 // Only referenced functions get into the Personalities list.
1068 const std::vector<Function *>& Personalities = MMI->getPersonalities();
1070 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1071 E = Personalities.end(); I != E; ++I)
1072 if (*I) GVStubs.insert("_" + (*I)->getName());
1075 // Output stubs for external and common global variables.
1076 if (!GVStubs.empty()) {
1077 SwitchToDataSection(".non_lazy_symbol_pointer");
1078 for (std::set<std::string>::iterator I = GVStubs.begin(),
1079 E = GVStubs.end(); I != E; ++I) {
1081 printSuffixedName(p, "$non_lazy_ptr");
1083 O << "\t.indirect_symbol " << *I << '\n';
1085 O << "\t.quad\t0\n";
1087 O << "\t.long\t0\n";
1091 // Emit initial debug information.
1094 // Funny Darwin hack: This flag tells the linker that no global symbols
1095 // contain code that falls through to other global symbols (e.g. the obvious
1096 // implementation of multiple entry points). If this doesn't occur, the
1097 // linker can safely perform dead code stripping. Since LLVM never generates
1098 // code that does this, it is always safe to set.
1099 O << "\t.subsections_via_symbols\n";
1101 return AsmPrinter::doFinalization(M);
1106 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1107 /// for a MachineFunction to the given output stream, in a format that the
1108 /// Darwin assembler can deal with.
1110 FunctionPass *llvm::createPPCAsmPrinterPass(std::ostream &o,
1111 PPCTargetMachine &tm) {
1112 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1114 if (Subtarget->isDarwin()) {
1115 return new PPCDarwinAsmPrinter(o, tm, tm.getTargetAsmInfo());
1117 return new PPCLinuxAsmPrinter(o, tm, tm.getTargetAsmInfo());
1122 static struct Register {
1124 PPCTargetMachine::registerAsmPrinter(createPPCAsmPrinterPass);