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()))) {
189 // Dynamically-resolved functions need a stub for the function.
190 std::string Name = Mang->getValueName(GV);
191 FnStubs.insert(Name);
192 O << "L" << Name << "$stub";
193 if (GV->hasExternalWeakLinkage())
194 ExtWeakSymbols.insert(GV);
198 if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
199 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName();
200 FnStubs.insert(Name);
201 O << "L" << Name << "$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 /// LinuxAsmPrinter - PowerPC assembly printer, customized for Linux
293 struct VISIBILITY_HIDDEN LinuxAsmPrinter : public PPCAsmPrinter {
297 LinuxAsmPrinter(std::ostream &O, PPCTargetMachine &TM,
298 const TargetAsmInfo *T)
299 : PPCAsmPrinter(O, TM, T), DW(O, this, T) {
302 virtual const char *getPassName() const {
303 return "Linux PPC Assembly Printer";
306 bool runOnMachineFunction(MachineFunction &F);
307 bool doInitialization(Module &M);
308 bool doFinalization(Module &M);
310 void getAnalysisUsage(AnalysisUsage &AU) const {
311 AU.setPreservesAll();
312 AU.addRequired<MachineModuleInfo>();
313 PPCAsmPrinter::getAnalysisUsage(AU);
316 /// getSectionForFunction - Return the section that we should emit the
317 /// specified function body into.
318 virtual std::string getSectionForFunction(const Function &F) const;
321 /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS
323 struct VISIBILITY_HIDDEN DarwinAsmPrinter : public PPCAsmPrinter {
326 MachineModuleInfo *MMI;
328 DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM,
329 const TargetAsmInfo *T)
330 : PPCAsmPrinter(O, TM, T), DW(O, this, T), MMI(0) {
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 PPCAsmPrinter::getAnalysisUsage(AU);
347 /// getSectionForFunction - Return the section that we should emit the
348 /// specified function body into.
349 virtual std::string getSectionForFunction(const Function &F) const;
351 } // end of anonymous namespace
353 // Include the auto-generated portion of the assembly writer
354 #include "PPCGenAsmWriter.inc"
356 void PPCAsmPrinter::printOp(const MachineOperand &MO) {
357 switch (MO.getType()) {
358 case MachineOperand::MO_Immediate:
359 cerr << "printOp() does not handle immediate values\n";
363 case MachineOperand::MO_MachineBasicBlock:
364 printBasicBlockLabel(MO.getMBB());
366 case MachineOperand::MO_JumpTableIndex:
367 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
368 << '_' << MO.getIndex();
369 // FIXME: PIC relocation model
371 case MachineOperand::MO_ConstantPoolIndex:
372 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
373 << '_' << MO.getIndex();
375 case MachineOperand::MO_ExternalSymbol:
376 // Computing the address of an external symbol, not calling it.
377 if (TM.getRelocationModel() != Reloc::Static) {
378 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName();
379 GVStubs.insert(Name);
380 O << "L" << Name << "$non_lazy_ptr";
383 O << TAI->getGlobalPrefix() << MO.getSymbolName();
385 case MachineOperand::MO_GlobalAddress: {
386 // Computing the address of a global symbol, not calling it.
387 GlobalValue *GV = MO.getGlobal();
388 std::string Name = Mang->getValueName(GV);
390 // External or weakly linked global variables need non-lazily-resolved stubs
391 if (TM.getRelocationModel() != Reloc::Static) {
392 if (((GV->isDeclaration() || GV->hasWeakLinkage() ||
393 GV->hasLinkOnceLinkage()))) {
394 GVStubs.insert(Name);
395 O << "L" << Name << "$non_lazy_ptr";
401 if (MO.getOffset() > 0)
402 O << "+" << MO.getOffset();
403 else if (MO.getOffset() < 0)
406 if (GV->hasExternalWeakLinkage())
407 ExtWeakSymbols.insert(GV);
412 O << "<unknown operand type: " << MO.getType() << ">";
417 /// EmitExternalGlobal - In this case we need to use the indirect symbol.
419 void PPCAsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
420 std::string Name = getGlobalLinkName(GV);
421 if (TM.getRelocationModel() != Reloc::Static) {
422 GVStubs.insert(Name);
423 O << "L" << Name << "$non_lazy_ptr";
429 /// PrintAsmOperand - Print out an operand for an inline asm expression.
431 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
433 const char *ExtraCode) {
434 // Does this asm operand have a single letter operand modifier?
435 if (ExtraCode && ExtraCode[0]) {
436 if (ExtraCode[1] != 0) return true; // Unknown modifier.
438 switch (ExtraCode[0]) {
439 default: return true; // Unknown modifier.
440 case 'c': // Don't print "$" before a global var name or constant.
441 // PPC never has a prefix.
442 printOperand(MI, OpNo);
444 case 'L': // Write second word of DImode reference.
445 // Verify that this operand has two consecutive registers.
446 if (!MI->getOperand(OpNo).isRegister() ||
447 OpNo+1 == MI->getNumOperands() ||
448 !MI->getOperand(OpNo+1).isRegister())
450 ++OpNo; // Return the high-part.
453 // Write 'i' if an integer constant, otherwise nothing. Used to print
455 if (MI->getOperand(OpNo).isImmediate())
461 printOperand(MI, OpNo);
465 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
467 const char *ExtraCode) {
468 if (ExtraCode && ExtraCode[0])
469 return true; // Unknown modifier.
470 if (MI->getOperand(OpNo).isRegister())
471 printMemRegReg(MI, OpNo);
473 printMemRegImm(MI, OpNo);
477 void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
478 const char *Modifier) {
479 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
480 unsigned Code = MI->getOperand(OpNo).getImm();
481 if (!strcmp(Modifier, "cc")) {
482 switch ((PPC::Predicate)Code) {
483 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
484 case PPC::PRED_LT: O << "lt"; return;
485 case PPC::PRED_LE: O << "le"; return;
486 case PPC::PRED_EQ: O << "eq"; return;
487 case PPC::PRED_GE: O << "ge"; return;
488 case PPC::PRED_GT: O << "gt"; return;
489 case PPC::PRED_NE: O << "ne"; return;
490 case PPC::PRED_UN: O << "un"; return;
491 case PPC::PRED_NU: O << "nu"; return;
495 assert(!strcmp(Modifier, "reg") &&
496 "Need to specify 'cc' or 'reg' as predicate op modifier!");
497 // Don't print the register for 'always'.
498 if (Code == PPC::PRED_ALWAYS) return;
499 printOperand(MI, OpNo+1);
504 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
505 /// the current output stream.
507 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
510 // Check for slwi/srwi mnemonics.
511 if (MI->getOpcode() == PPC::RLWINM) {
512 bool FoundMnemonic = false;
513 unsigned char SH = MI->getOperand(2).getImm();
514 unsigned char MB = MI->getOperand(3).getImm();
515 unsigned char ME = MI->getOperand(4).getImm();
516 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
517 O << "\tslwi "; FoundMnemonic = true;
519 if (SH <= 31 && MB == (32-SH) && ME == 31) {
520 O << "\tsrwi "; FoundMnemonic = true;
527 O << ", " << (unsigned int)SH << "\n";
530 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
531 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
539 } else if (MI->getOpcode() == PPC::RLDICR) {
540 unsigned char SH = MI->getOperand(2).getImm();
541 unsigned char ME = MI->getOperand(3).getImm();
542 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
548 O << ", " << (unsigned int)SH << "\n";
553 if (printInstruction(MI))
554 return; // Printer was automatically generated
556 assert(0 && "Unhandled instruction in asm writer!");
561 /// runOnMachineFunction - This uses the printMachineInstruction()
562 /// method to print assembly for each instruction.
564 bool LinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
565 DW.SetModuleInfo(&getAnalysis<MachineModuleInfo>());
567 SetupMachineFunction(MF);
570 // Print out constants referenced by the function
571 EmitConstantPool(MF.getConstantPool());
573 // Print out labels for the function.
574 const Function *F = MF.getFunction();
575 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
577 switch (F->getLinkage()) {
578 default: assert(0 && "Unknown linkage type!");
579 case Function::InternalLinkage: // Symbols default to internal.
581 case Function::ExternalLinkage:
582 O << "\t.global\t" << CurrentFnName << '\n'
583 << "\t.type\t" << CurrentFnName << ", @function\n";
585 case Function::WeakLinkage:
586 case Function::LinkOnceLinkage:
587 O << "\t.global\t" << CurrentFnName << '\n';
588 O << "\t.weak\t" << CurrentFnName << '\n';
592 if (F->hasHiddenVisibility())
593 if (const char *Directive = TAI->getHiddenDirective())
594 O << Directive << CurrentFnName << "\n";
597 O << CurrentFnName << ":\n";
599 // Emit pre-function debug information.
600 DW.BeginFunction(&MF);
602 // Print out code for the function.
603 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
605 // Print a label for the basic block.
606 if (I != MF.begin()) {
607 printBasicBlockLabel(I, true, true);
610 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
612 // Print the assembly for the instruction.
613 printMachineInstruction(II);
617 O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << "\n";
619 // Print out jump tables referenced by the function.
620 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
622 // Emit post-function debug information.
625 // We didn't modify anything.
629 bool LinuxAsmPrinter::doInitialization(Module &M) {
630 bool Result = AsmPrinter::doInitialization(M);
632 // GNU as handles section names wrapped in quotes
633 Mang->setUseQuotes(true);
635 SwitchToTextSection(TAI->getTextSection());
637 // Emit initial debug information.
642 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
643 /// Don't print things like \n or \0.
644 static void PrintUnmangledNameSafely(const Value *V, std::ostream &OS) {
645 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
651 bool LinuxAsmPrinter::doFinalization(Module &M) {
652 const TargetData *TD = TM.getTargetData();
654 // Print out module-level global variables here.
655 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
657 if (!I->hasInitializer()) continue; // External global require no code
659 // Check to see if this is a special global used by LLVM, if so, emit it.
660 if (EmitSpecialLLVMGlobal(I))
663 std::string name = Mang->getValueName(I);
665 if (I->hasHiddenVisibility())
666 if (const char *Directive = TAI->getHiddenDirective())
667 O << Directive << name << "\n";
669 Constant *C = I->getInitializer();
670 unsigned Size = TD->getABITypeSize(C->getType());
671 unsigned Align = TD->getPreferredAlignmentLog(I);
673 if (C->isNullValue() && /* FIXME: Verify correct */
675 (I->hasInternalLinkage() || I->hasWeakLinkage() ||
676 I->hasLinkOnceLinkage() || I->hasExternalLinkage())) {
677 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
678 if (I->hasExternalLinkage()) {
679 O << "\t.global " << name << '\n';
680 O << "\t.type " << name << ", @object\n";
681 if (TAI->getBSSSection())
682 SwitchToDataSection(TAI->getBSSSection(), I);
684 O << "\t.zero " << Size << "\n";
685 } else if (I->hasInternalLinkage()) {
686 SwitchToDataSection("\t.data", I);
687 O << TAI->getLCOMMDirective() << name << "," << Size;
689 SwitchToDataSection("\t.data", I);
690 O << ".comm " << name << "," << Size;
692 O << "\t\t" << TAI->getCommentString() << " '";
693 PrintUnmangledNameSafely(I, O);
696 switch (I->getLinkage()) {
697 case GlobalValue::LinkOnceLinkage:
698 case GlobalValue::WeakLinkage:
699 O << "\t.global " << name << '\n'
700 << "\t.type " << name << ", @object\n"
701 << "\t.weak " << name << '\n';
702 SwitchToDataSection("\t.data", I);
704 case GlobalValue::AppendingLinkage:
705 // FIXME: appending linkage variables should go into a section of
706 // their name or something. For now, just emit them as external.
707 case GlobalValue::ExternalLinkage:
708 // If external or appending, declare as a global symbol
709 O << "\t.global " << name << "\n"
710 << "\t.type " << name << ", @object\n";
712 case GlobalValue::InternalLinkage:
713 if (I->isConstant()) {
714 const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
715 if (TAI->getCStringSection() && CVA && CVA->isCString()) {
716 SwitchToDataSection(TAI->getCStringSection(), I);
721 // FIXME: special handling for ".ctors" & ".dtors" sections
722 if (I->hasSection() &&
723 (I->getSection() == ".ctors" ||
724 I->getSection() == ".dtors")) {
725 std::string SectionName = ".section " + I->getSection()
726 + ",\"aw\",@progbits";
727 SwitchToDataSection(SectionName.c_str());
729 if (I->isConstant() && TAI->getReadOnlySection())
730 SwitchToDataSection(TAI->getReadOnlySection(), I);
732 SwitchToDataSection(TAI->getDataSection(), I);
736 cerr << "Unknown linkage type!";
740 EmitAlignment(Align, I);
741 O << name << ":\t\t\t\t" << TAI->getCommentString() << " '";
742 PrintUnmangledNameSafely(I, O);
745 // If the initializer is a extern weak symbol, remember to emit the weak
747 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
748 if (GV->hasExternalWeakLinkage())
749 ExtWeakSymbols.insert(GV);
751 EmitGlobalConstant(C);
758 // Emit initial debug information.
761 return AsmPrinter::doFinalization(M);
764 std::string LinuxAsmPrinter::getSectionForFunction(const Function &F) const {
765 switch (F.getLinkage()) {
766 default: assert(0 && "Unknown linkage type!");
767 case Function::ExternalLinkage:
768 case Function::InternalLinkage: return TAI->getTextSection();
769 case Function::WeakLinkage:
770 case Function::LinkOnceLinkage:
775 std::string DarwinAsmPrinter::getSectionForFunction(const Function &F) const {
776 switch (F.getLinkage()) {
777 default: assert(0 && "Unknown linkage type!");
778 case Function::ExternalLinkage:
779 case Function::InternalLinkage: return TAI->getTextSection();
780 case Function::WeakLinkage:
781 case Function::LinkOnceLinkage:
782 return "\t.section __TEXT,__textcoal_nt,coalesced,pure_instructions";
786 /// runOnMachineFunction - This uses the printMachineInstruction()
787 /// method to print assembly for each instruction.
789 bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
790 // We need this for Personality functions.
791 MMI = &getAnalysis<MachineModuleInfo>();
792 DW.SetModuleInfo(MMI);
794 SetupMachineFunction(MF);
797 // Print out constants referenced by the function
798 EmitConstantPool(MF.getConstantPool());
800 // Print out labels for the function.
801 const Function *F = MF.getFunction();
802 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
804 switch (F->getLinkage()) {
805 default: assert(0 && "Unknown linkage type!");
806 case Function::InternalLinkage: // Symbols default to internal.
808 case Function::ExternalLinkage:
809 O << "\t.globl\t" << CurrentFnName << "\n";
811 case Function::WeakLinkage:
812 case Function::LinkOnceLinkage:
813 O << "\t.globl\t" << CurrentFnName << "\n";
814 O << "\t.weak_definition\t" << CurrentFnName << "\n";
818 if (F->hasHiddenVisibility())
819 if (const char *Directive = TAI->getHiddenDirective())
820 O << Directive << CurrentFnName << "\n";
822 EmitAlignment(OptimizeForSize ? 2 : 4, F);
823 O << CurrentFnName << ":\n";
825 // Emit pre-function debug information.
826 DW.BeginFunction(&MF);
828 // If the function is empty, then we need to emit *something*. Otherwise, the
829 // function's label might be associated with something that it wasn't meant to
830 // be associated with. We emit a noop in this situation.
831 MachineFunction::iterator I = MF.begin();
833 if (++I == MF.end() && MF.front().empty())
836 // Print out code for the function.
837 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
839 // Print a label for the basic block.
840 if (I != MF.begin()) {
841 printBasicBlockLabel(I, true, true);
844 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
846 // Print the assembly for the instruction.
847 printMachineInstruction(II);
851 // Print out jump tables referenced by the function.
852 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
854 // Emit post-function debug information.
857 // We didn't modify anything.
862 bool DarwinAsmPrinter::doInitialization(Module &M) {
863 static const char *const CPUDirectives[] = {
875 unsigned Directive = Subtarget.getDarwinDirective();
876 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
877 Directive = PPC::DIR_970;
878 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
879 Directive = PPC::DIR_7400;
880 if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
881 Directive = PPC::DIR_64;
882 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
883 O << "\t.machine " << CPUDirectives[Directive] << "\n";
885 bool Result = AsmPrinter::doInitialization(M);
887 // Darwin wants symbols to be quoted if they have complex names.
888 Mang->setUseQuotes(true);
890 // Prime text sections so they are adjacent. This reduces the likelihood a
891 // large data or debug section causes a branch to exceed 16M limit.
892 SwitchToTextSection("\t.section __TEXT,__textcoal_nt,coalesced,"
893 "pure_instructions");
894 if (TM.getRelocationModel() == Reloc::PIC_) {
895 SwitchToTextSection("\t.section __TEXT,__picsymbolstub1,symbol_stubs,"
896 "pure_instructions,32");
897 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
898 SwitchToTextSection("\t.section __TEXT,__symbol_stub1,symbol_stubs,"
899 "pure_instructions,16");
901 SwitchToTextSection(TAI->getTextSection());
903 // Emit initial debug information.
908 bool DarwinAsmPrinter::doFinalization(Module &M) {
909 const TargetData *TD = TM.getTargetData();
911 // Print out module-level global variables here.
912 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
914 if (!I->hasInitializer()) continue; // External global require no code
916 // Check to see if this is a special global used by LLVM, if so, emit it.
917 if (EmitSpecialLLVMGlobal(I)) {
918 if (TM.getRelocationModel() == Reloc::Static) {
919 if (I->getName() == "llvm.global_ctors")
920 O << ".reference .constructors_used\n";
921 else if (I->getName() == "llvm.global_dtors")
922 O << ".reference .destructors_used\n";
927 std::string name = Mang->getValueName(I);
929 if (I->hasHiddenVisibility())
930 if (const char *Directive = TAI->getHiddenDirective())
931 O << Directive << name << "\n";
933 Constant *C = I->getInitializer();
934 const Type *Type = C->getType();
935 unsigned Size = TD->getABITypeSize(Type);
936 unsigned Align = TD->getPreferredAlignmentLog(I);
938 if (C->isNullValue() && /* FIXME: Verify correct */
940 (I->hasInternalLinkage() || I->hasWeakLinkage() ||
941 I->hasLinkOnceLinkage() || I->hasExternalLinkage())) {
942 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
943 if (I->hasExternalLinkage()) {
944 O << "\t.globl " << name << '\n';
945 O << "\t.zerofill __DATA, __common, " << name << ", "
946 << Size << ", " << Align;
947 } else if (I->hasInternalLinkage()) {
948 SwitchToDataSection("\t.data", I);
949 O << TAI->getLCOMMDirective() << name << "," << Size << "," << Align;
951 SwitchToDataSection("\t.data", I);
952 O << ".comm " << name << "," << Size;
953 // Darwin 9 and above support aligned common data.
954 if (Subtarget.isDarwin9())
957 O << "\t\t" << TAI->getCommentString() << " '";
958 PrintUnmangledNameSafely(I, O);
961 switch (I->getLinkage()) {
962 case GlobalValue::LinkOnceLinkage:
963 case GlobalValue::WeakLinkage:
964 O << "\t.globl " << name << '\n'
965 << "\t.weak_definition " << name << '\n';
966 SwitchToDataSection("\t.section __DATA,__datacoal_nt,coalesced", I);
968 case GlobalValue::AppendingLinkage:
969 // FIXME: appending linkage variables should go into a section of
970 // their name or something. For now, just emit them as external.
971 case GlobalValue::ExternalLinkage:
972 // If external or appending, declare as a global symbol
973 O << "\t.globl " << name << "\n";
975 case GlobalValue::InternalLinkage:
976 if (I->isConstant()) {
977 const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
978 if (TAI->getCStringSection() && CVA && CVA->isCString()) {
979 SwitchToDataSection(TAI->getCStringSection(), I);
983 if (I->hasSection()) {
984 // Honor all section names on Darwin; ObjC uses this
985 std::string SectionName = ".section " + I->getSection();
986 SwitchToDataSection(SectionName.c_str());
987 } else if (!I->isConstant())
988 SwitchToDataSection(TAI->getDataSection(), I);
991 bool HasReloc = C->ContainsRelocations();
993 TM.getRelocationModel() != Reloc::Static)
994 SwitchToDataSection("\t.const_data\n");
995 else if (!HasReloc && Size == 4 &&
996 TAI->getFourByteConstantSection())
997 SwitchToDataSection(TAI->getFourByteConstantSection(), I);
998 else if (!HasReloc && Size == 8 &&
999 TAI->getEightByteConstantSection())
1000 SwitchToDataSection(TAI->getEightByteConstantSection(), I);
1001 else if (!HasReloc && Size == 16 &&
1002 TAI->getSixteenByteConstantSection())
1003 SwitchToDataSection(TAI->getSixteenByteConstantSection(), I);
1004 else if (TAI->getReadOnlySection())
1005 SwitchToDataSection(TAI->getReadOnlySection(), I);
1007 SwitchToDataSection(TAI->getDataSection(), I);
1011 cerr << "Unknown linkage type!";
1015 EmitAlignment(Align, I);
1016 O << name << ":\t\t\t\t" << TAI->getCommentString() << " '";
1017 PrintUnmangledNameSafely(I, O);
1020 // If the initializer is a extern weak symbol, remember to emit the weak
1022 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
1023 if (GV->hasExternalWeakLinkage())
1024 ExtWeakSymbols.insert(GV);
1026 EmitGlobalConstant(C);
1031 bool isPPC64 = TD->getPointerSizeInBits() == 64;
1033 // Output stubs for dynamically-linked functions
1034 if (TM.getRelocationModel() == Reloc::PIC_) {
1035 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
1037 SwitchToTextSection("\t.section __TEXT,__picsymbolstub1,symbol_stubs,"
1038 "pure_instructions,32");
1040 O << "L" << *i << "$stub:\n";
1041 O << "\t.indirect_symbol " << *i << "\n";
1043 O << "\tbcl 20,31,L0$" << *i << "\n";
1044 O << "L0$" << *i << ":\n";
1045 O << "\tmflr r11\n";
1046 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n";
1049 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
1051 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
1052 O << "\tmtctr r12\n";
1054 SwitchToDataSection(".lazy_symbol_pointer");
1055 O << "L" << *i << "$lazy_ptr:\n";
1056 O << "\t.indirect_symbol " << *i << "\n";
1058 O << "\t.quad dyld_stub_binding_helper\n";
1060 O << "\t.long dyld_stub_binding_helper\n";
1063 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
1065 SwitchToTextSection("\t.section __TEXT,__symbol_stub1,symbol_stubs,"
1066 "pure_instructions,16");
1068 O << "L" << *i << "$stub:\n";
1069 O << "\t.indirect_symbol " << *i << "\n";
1070 O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n";
1072 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
1074 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
1075 O << "\tmtctr r12\n";
1077 SwitchToDataSection(".lazy_symbol_pointer");
1078 O << "L" << *i << "$lazy_ptr:\n";
1079 O << "\t.indirect_symbol " << *i << "\n";
1081 O << "\t.quad dyld_stub_binding_helper\n";
1083 O << "\t.long dyld_stub_binding_helper\n";
1089 if (ExceptionHandling && TAI->doesSupportExceptionHandling() && MMI) {
1090 // Add the (possibly multiple) personalities to the set of global values.
1091 const std::vector<Function *>& Personalities = MMI->getPersonalities();
1093 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
1094 E = Personalities.end(); I != E; ++I)
1095 if (*I) GVStubs.insert("_" + (*I)->getName());
1098 // Output stubs for external and common global variables.
1099 if (!GVStubs.empty()) {
1100 SwitchToDataSection(".non_lazy_symbol_pointer");
1101 for (std::set<std::string>::iterator I = GVStubs.begin(),
1102 E = GVStubs.end(); I != E; ++I) {
1103 O << "L" << *I << "$non_lazy_ptr:\n";
1104 O << "\t.indirect_symbol " << *I << "\n";
1106 O << "\t.quad\t0\n";
1108 O << "\t.long\t0\n";
1113 // Emit initial debug information.
1116 // Funny Darwin hack: This flag tells the linker that no global symbols
1117 // contain code that falls through to other global symbols (e.g. the obvious
1118 // implementation of multiple entry points). If this doesn't occur, the
1119 // linker can safely perform dead code stripping. Since LLVM never generates
1120 // code that does this, it is always safe to set.
1121 O << "\t.subsections_via_symbols\n";
1123 return AsmPrinter::doFinalization(M);
1128 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1129 /// for a MachineFunction to the given output stream, in a format that the
1130 /// Darwin assembler can deal with.
1132 FunctionPass *llvm::createPPCAsmPrinterPass(std::ostream &o,
1133 PPCTargetMachine &tm) {
1134 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1136 if (Subtarget->isDarwin()) {
1137 return new DarwinAsmPrinter(o, tm, tm.getTargetAsmInfo());
1139 return new LinuxAsmPrinter(o, tm, tm.getTargetAsmInfo());