1 //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --------=//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source 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/Support/Mangler.h"
34 #include "llvm/Support/MathExtras.h"
35 #include "llvm/Support/CommandLine.h"
36 #include "llvm/Support/Debug.h"
37 #include "llvm/Support/Compiler.h"
38 #include "llvm/Target/TargetAsmInfo.h"
39 #include "llvm/Target/MRegisterInfo.h"
40 #include "llvm/Target/TargetInstrInfo.h"
41 #include "llvm/Target/TargetOptions.h"
42 #include "llvm/ADT/Statistic.h"
43 #include "llvm/ADT/StringExtras.h"
47 STATISTIC(EmittedInsts, "Number of machine instrs printed");
50 struct VISIBILITY_HIDDEN PPCAsmPrinter : public AsmPrinter {
51 std::set<std::string> FnStubs, GVStubs;
52 const PPCSubtarget &Subtarget;
54 PPCAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
55 : AsmPrinter(O, TM, T), Subtarget(TM.getSubtarget<PPCSubtarget>()) {
58 virtual const char *getPassName() const {
59 return "PowerPC Assembly Printer";
62 PPCTargetMachine &getTM() {
63 return static_cast<PPCTargetMachine&>(TM);
66 unsigned enumRegToMachineReg(unsigned enumReg) {
68 default: assert(0 && "Unhandled register!"); break;
69 case PPC::CR0: return 0;
70 case PPC::CR1: return 1;
71 case PPC::CR2: return 2;
72 case PPC::CR3: return 3;
73 case PPC::CR4: return 4;
74 case PPC::CR5: return 5;
75 case PPC::CR6: return 6;
76 case PPC::CR7: return 7;
81 /// printInstruction - This method is automatically generated by tablegen
82 /// from the instruction set description. This method returns true if the
83 /// machine instruction was sufficiently described to print it, otherwise it
85 bool printInstruction(const MachineInstr *MI);
87 void printMachineInstruction(const MachineInstr *MI);
88 void printOp(const MachineOperand &MO);
90 /// stripRegisterPrefix - This method strips the character prefix from a
91 /// register name so that only the number is left. Used by for linux asm.
92 const char *stripRegisterPrefix(const char *RegName) {
96 case 'v': return RegName + 1;
97 case 'c': if (RegName[1] == 'r') return RegName + 2;
103 /// printRegister - Print register according to target requirements.
105 void printRegister(const MachineOperand &MO, bool R0AsZero) {
106 unsigned RegNo = MO.getReg();
107 assert(MRegisterInfo::isPhysicalRegister(RegNo) && "Not physreg??");
109 // If we should use 0 for R0.
110 if (R0AsZero && RegNo == PPC::R0) {
115 const char *RegName = TM.getRegisterInfo()->get(RegNo).Name;
116 // Linux assembler (Others?) does not take register mnemonics.
117 // FIXME - What about special registers used in mfspr/mtspr?
118 if (!Subtarget.isDarwin()) RegName = stripRegisterPrefix(RegName);
122 void printOperand(const MachineInstr *MI, unsigned OpNo) {
123 const MachineOperand &MO = MI->getOperand(OpNo);
124 if (MO.isRegister()) {
125 printRegister(MO, false);
126 } else if (MO.isImmediate()) {
127 O << MO.getImmedValue();
133 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
134 unsigned AsmVariant, const char *ExtraCode);
135 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
136 unsigned AsmVariant, const char *ExtraCode);
139 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
140 char value = MI->getOperand(OpNo).getImmedValue();
141 value = (value << (32-5)) >> (32-5);
144 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
145 unsigned char value = MI->getOperand(OpNo).getImmedValue();
146 assert(value <= 31 && "Invalid u5imm argument!");
147 O << (unsigned int)value;
149 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) {
150 unsigned char value = MI->getOperand(OpNo).getImmedValue();
151 assert(value <= 63 && "Invalid u6imm argument!");
152 O << (unsigned int)value;
154 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
155 O << (short)MI->getOperand(OpNo).getImmedValue();
157 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
158 O << (unsigned short)MI->getOperand(OpNo).getImmedValue();
160 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
161 if (MI->getOperand(OpNo).isImmediate()) {
162 O << (short)(MI->getOperand(OpNo).getImmedValue()*4);
165 printOp(MI->getOperand(OpNo));
166 if (TM.getRelocationModel() == Reloc::PIC_)
167 O << "-\"L" << getFunctionNumber() << "$pb\")";
172 void printBranchOperand(const MachineInstr *MI, unsigned OpNo) {
173 // Branches can take an immediate operand. This is used by the branch
174 // selection pass to print $+8, an eight byte displacement from the PC.
175 if (MI->getOperand(OpNo).isImmediate()) {
176 O << "$+" << MI->getOperand(OpNo).getImmedValue()*4;
178 printOp(MI->getOperand(OpNo));
181 void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
182 const MachineOperand &MO = MI->getOperand(OpNo);
183 if (TM.getRelocationModel() != Reloc::Static) {
184 if (MO.getType() == MachineOperand::MO_GlobalAddress) {
185 GlobalValue *GV = MO.getGlobal();
186 if (((GV->isDeclaration() || GV->hasWeakLinkage() ||
187 GV->hasLinkOnceLinkage()))) {
188 // Dynamically-resolved functions need a stub for the function.
189 std::string Name = Mang->getValueName(GV);
190 FnStubs.insert(Name);
191 O << "L" << Name << "$stub";
192 if (GV->hasExternalWeakLinkage())
193 ExtWeakSymbols.insert(GV);
197 if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
198 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName();
199 FnStubs.insert(Name);
200 O << "L" << Name << "$stub";
205 printOp(MI->getOperand(OpNo));
207 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
208 O << (int)MI->getOperand(OpNo).getImmedValue()*4;
210 void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
211 O << "\"L" << getFunctionNumber() << "$pb\"\n";
212 O << "\"L" << getFunctionNumber() << "$pb\":";
214 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
215 if (MI->getOperand(OpNo).isImmediate()) {
216 printS16ImmOperand(MI, OpNo);
218 if (Subtarget.isDarwin()) O << "ha16(";
219 printOp(MI->getOperand(OpNo));
220 if (TM.getRelocationModel() == Reloc::PIC_)
221 O << "-\"L" << getFunctionNumber() << "$pb\"";
222 if (Subtarget.isDarwin())
228 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
229 if (MI->getOperand(OpNo).isImmediate()) {
230 printS16ImmOperand(MI, OpNo);
232 if (Subtarget.isDarwin()) O << "lo16(";
233 printOp(MI->getOperand(OpNo));
234 if (TM.getRelocationModel() == Reloc::PIC_)
235 O << "-\"L" << getFunctionNumber() << "$pb\"";
236 if (Subtarget.isDarwin())
242 void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
243 unsigned CCReg = MI->getOperand(OpNo).getReg();
244 unsigned RegNo = enumRegToMachineReg(CCReg);
245 O << (0x80 >> RegNo);
247 // The new addressing mode printers.
248 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
249 printSymbolLo(MI, OpNo);
251 if (MI->getOperand(OpNo+1).isRegister() &&
252 MI->getOperand(OpNo+1).getReg() == PPC::R0)
255 printOperand(MI, OpNo+1);
258 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) {
259 if (MI->getOperand(OpNo).isImmediate())
260 printS16X4ImmOperand(MI, OpNo);
262 printSymbolLo(MI, OpNo);
264 if (MI->getOperand(OpNo+1).isRegister() &&
265 MI->getOperand(OpNo+1).getReg() == PPC::R0)
268 printOperand(MI, OpNo+1);
272 void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
273 // When used as the base register, r0 reads constant zero rather than
274 // the value contained in the register. For this reason, the darwin
275 // assembler requires that we print r0 as 0 (no r) when used as the base.
276 const MachineOperand &MO = MI->getOperand(OpNo);
277 printRegister(MO, true);
279 printOperand(MI, OpNo+1);
282 void printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
283 const char *Modifier);
285 virtual bool runOnMachineFunction(MachineFunction &F) = 0;
286 virtual bool doFinalization(Module &M) = 0;
288 virtual void EmitExternalGlobal(const GlobalVariable *GV);
291 /// LinuxAsmPrinter - PowerPC assembly printer, customized for Linux
292 struct VISIBILITY_HIDDEN LinuxAsmPrinter : public PPCAsmPrinter {
296 LinuxAsmPrinter(std::ostream &O, PPCTargetMachine &TM,
297 const TargetAsmInfo *T)
298 : PPCAsmPrinter(O, TM, T), DW(O, this, T) {
301 virtual const char *getPassName() const {
302 return "Linux PPC Assembly Printer";
305 bool runOnMachineFunction(MachineFunction &F);
306 bool doInitialization(Module &M);
307 bool doFinalization(Module &M);
309 void getAnalysisUsage(AnalysisUsage &AU) const {
310 AU.setPreservesAll();
311 AU.addRequired<MachineModuleInfo>();
312 PPCAsmPrinter::getAnalysisUsage(AU);
315 /// getSectionForFunction - Return the section that we should emit the
316 /// specified function body into.
317 virtual std::string getSectionForFunction(const Function &F) const;
320 /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS
322 struct VISIBILITY_HIDDEN DarwinAsmPrinter : public PPCAsmPrinter {
326 DarwinAsmPrinter(std::ostream &O, PPCTargetMachine &TM,
327 const TargetAsmInfo *T)
328 : PPCAsmPrinter(O, TM, T), DW(O, this, T) {
331 virtual const char *getPassName() const {
332 return "Darwin PPC Assembly Printer";
335 bool runOnMachineFunction(MachineFunction &F);
336 bool doInitialization(Module &M);
337 bool doFinalization(Module &M);
339 void getAnalysisUsage(AnalysisUsage &AU) const {
340 AU.setPreservesAll();
341 AU.addRequired<MachineModuleInfo>();
342 PPCAsmPrinter::getAnalysisUsage(AU);
345 /// getSectionForFunction - Return the section that we should emit the
346 /// specified function body into.
347 virtual std::string getSectionForFunction(const Function &F) const;
349 } // end of anonymous namespace
351 // Include the auto-generated portion of the assembly writer
352 #include "PPCGenAsmWriter.inc"
354 void PPCAsmPrinter::printOp(const MachineOperand &MO) {
355 switch (MO.getType()) {
356 case MachineOperand::MO_Immediate:
357 cerr << "printOp() does not handle immediate values\n";
361 case MachineOperand::MO_MachineBasicBlock:
362 printBasicBlockLabel(MO.getMachineBasicBlock());
364 case MachineOperand::MO_JumpTableIndex:
365 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
366 << '_' << MO.getJumpTableIndex();
367 // FIXME: PIC relocation model
369 case MachineOperand::MO_ConstantPoolIndex:
370 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
371 << '_' << MO.getConstantPoolIndex();
373 case MachineOperand::MO_ExternalSymbol:
374 // Computing the address of an external symbol, not calling it.
375 if (TM.getRelocationModel() != Reloc::Static) {
376 std::string Name(TAI->getGlobalPrefix()); Name += MO.getSymbolName();
377 GVStubs.insert(Name);
378 O << "L" << Name << "$non_lazy_ptr";
381 O << TAI->getGlobalPrefix() << MO.getSymbolName();
383 case MachineOperand::MO_GlobalAddress: {
384 // Computing the address of a global symbol, not calling it.
385 GlobalValue *GV = MO.getGlobal();
386 std::string Name = Mang->getValueName(GV);
388 // External or weakly linked global variables need non-lazily-resolved stubs
389 if (TM.getRelocationModel() != Reloc::Static) {
390 if (((GV->isDeclaration() || GV->hasWeakLinkage() ||
391 GV->hasLinkOnceLinkage()))) {
392 GVStubs.insert(Name);
393 O << "L" << Name << "$non_lazy_ptr";
399 if (GV->hasExternalWeakLinkage())
400 ExtWeakSymbols.insert(GV);
405 O << "<unknown operand type: " << MO.getType() << ">";
410 /// EmitExternalGlobal - In this case we need to use the indirect symbol.
412 void PPCAsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
413 std::string Name = getGlobalLinkName(GV);
414 if (TM.getRelocationModel() != Reloc::Static) {
415 GVStubs.insert(Name);
416 O << "L" << Name << "$non_lazy_ptr";
422 /// PrintAsmOperand - Print out an operand for an inline asm expression.
424 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
426 const char *ExtraCode) {
427 // Does this asm operand have a single letter operand modifier?
428 if (ExtraCode && ExtraCode[0]) {
429 if (ExtraCode[1] != 0) return true; // Unknown modifier.
431 switch (ExtraCode[0]) {
432 default: return true; // Unknown modifier.
433 case 'c': // Don't print "$" before a global var name or constant.
434 // PPC never has a prefix.
435 printOperand(MI, OpNo);
437 case 'L': // Write second word of DImode reference.
438 // Verify that this operand has two consecutive registers.
439 if (!MI->getOperand(OpNo).isRegister() ||
440 OpNo+1 == MI->getNumOperands() ||
441 !MI->getOperand(OpNo+1).isRegister())
443 ++OpNo; // Return the high-part.
448 printOperand(MI, OpNo);
452 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
454 const char *ExtraCode) {
455 if (ExtraCode && ExtraCode[0])
456 return true; // Unknown modifier.
457 if (MI->getOperand(OpNo).isRegister())
458 printMemRegReg(MI, OpNo);
460 printMemRegImm(MI, OpNo);
464 void PPCAsmPrinter::printPredicateOperand(const MachineInstr *MI, unsigned OpNo,
465 const char *Modifier) {
466 assert(Modifier && "Must specify 'cc' or 'reg' as predicate op modifier!");
467 unsigned Code = MI->getOperand(OpNo).getImm();
468 if (!strcmp(Modifier, "cc")) {
469 switch ((PPC::Predicate)Code) {
470 case PPC::PRED_ALWAYS: return; // Don't print anything for always.
471 case PPC::PRED_LT: O << "lt"; return;
472 case PPC::PRED_LE: O << "le"; return;
473 case PPC::PRED_EQ: O << "eq"; return;
474 case PPC::PRED_GE: O << "ge"; return;
475 case PPC::PRED_GT: O << "gt"; return;
476 case PPC::PRED_NE: O << "ne"; return;
477 case PPC::PRED_UN: O << "un"; return;
478 case PPC::PRED_NU: O << "nu"; return;
482 assert(!strcmp(Modifier, "reg") &&
483 "Need to specify 'cc' or 'reg' as predicate op modifier!");
484 // Don't print the register for 'always'.
485 if (Code == PPC::PRED_ALWAYS) return;
486 printOperand(MI, OpNo+1);
491 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
492 /// the current output stream.
494 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
497 // Check for slwi/srwi mnemonics.
498 if (MI->getOpcode() == PPC::RLWINM) {
499 bool FoundMnemonic = false;
500 unsigned char SH = MI->getOperand(2).getImmedValue();
501 unsigned char MB = MI->getOperand(3).getImmedValue();
502 unsigned char ME = MI->getOperand(4).getImmedValue();
503 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
504 O << "slwi "; FoundMnemonic = true;
506 if (SH <= 31 && MB == (32-SH) && ME == 31) {
507 O << "srwi "; FoundMnemonic = true;
514 O << ", " << (unsigned int)SH << "\n";
517 } else if (MI->getOpcode() == PPC::OR || MI->getOpcode() == PPC::OR8) {
518 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
526 } else if (MI->getOpcode() == PPC::RLDICR) {
527 unsigned char SH = MI->getOperand(2).getImmedValue();
528 unsigned char ME = MI->getOperand(3).getImmedValue();
529 // rldicr RA, RS, SH, 63-SH == sldi RA, RS, SH
535 O << ", " << (unsigned int)SH << "\n";
540 if (printInstruction(MI))
541 return; // Printer was automatically generated
543 assert(0 && "Unhandled instruction in asm writer!");
548 /// runOnMachineFunction - This uses the printMachineInstruction()
549 /// method to print assembly for each instruction.
551 bool LinuxAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
552 DW.SetModuleInfo(&getAnalysis<MachineModuleInfo>());
554 SetupMachineFunction(MF);
557 // Print out constants referenced by the function
558 EmitConstantPool(MF.getConstantPool());
560 // Print out labels for the function.
561 const Function *F = MF.getFunction();
562 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
564 switch (F->getLinkage()) {
565 default: assert(0 && "Unknown linkage type!");
566 case Function::InternalLinkage: // Symbols default to internal.
568 case Function::ExternalLinkage:
569 O << "\t.global\t" << CurrentFnName << '\n'
570 << "\t.type\t" << CurrentFnName << ", @function\n";
572 case Function::WeakLinkage:
573 case Function::LinkOnceLinkage:
574 O << "\t.global\t" << CurrentFnName << '\n';
575 O << "\t.weak\t" << CurrentFnName << '\n';
579 if (F->hasHiddenVisibility())
580 if (const char *Directive = TAI->getHiddenDirective())
581 O << Directive << CurrentFnName << "\n";
584 O << CurrentFnName << ":\n";
586 // Emit pre-function debug information.
587 DW.BeginFunction(&MF);
589 // Print out code for the function.
590 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
592 // Print a label for the basic block.
593 if (I != MF.begin()) {
594 printBasicBlockLabel(I, true);
597 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
599 // Print the assembly for the instruction.
601 printMachineInstruction(II);
605 O << "\t.size\t" << CurrentFnName << ",.-" << CurrentFnName << "\n";
607 // Print out jump tables referenced by the function.
608 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
610 // Emit post-function debug information.
613 // We didn't modify anything.
617 bool LinuxAsmPrinter::doInitialization(Module &M) {
618 AsmPrinter::doInitialization(M);
620 // GNU as handles section names wrapped in quotes
621 Mang->setUseQuotes(true);
623 SwitchToTextSection(TAI->getTextSection());
625 // Emit initial debug information.
630 bool LinuxAsmPrinter::doFinalization(Module &M) {
631 const TargetData *TD = TM.getTargetData();
633 // Print out module-level global variables here.
634 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
636 if (!I->hasInitializer()) continue; // External global require no code
638 // Check to see if this is a special global used by LLVM, if so, emit it.
639 if (EmitSpecialLLVMGlobal(I))
642 std::string name = Mang->getValueName(I);
644 if (I->hasHiddenVisibility())
645 if (const char *Directive = TAI->getHiddenDirective())
646 O << Directive << name << "\n";
648 Constant *C = I->getInitializer();
649 unsigned Size = TD->getTypeSize(C->getType());
650 unsigned Align = TD->getPreferredAlignmentLog(I);
652 if (C->isNullValue() && /* FIXME: Verify correct */
653 (I->hasInternalLinkage() || I->hasWeakLinkage() ||
654 I->hasLinkOnceLinkage() ||
655 (I->hasExternalLinkage() && !I->hasSection()))) {
656 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
657 if (I->hasExternalLinkage()) {
658 O << "\t.global " << name << '\n';
659 O << "\t.type " << name << ", @object\n";
660 //O << "\t.zerofill __DATA, __common, " << name << ", "
661 // << Size << ", " << Align;
662 } else if (I->hasInternalLinkage()) {
663 SwitchToDataSection("\t.data", I);
664 O << TAI->getLCOMMDirective() << name << "," << Size;
666 SwitchToDataSection("\t.data", I);
667 O << ".comm " << name << "," << Size;
669 O << "\t\t" << TAI->getCommentString() << " '" << I->getName() << "'\n";
671 switch (I->getLinkage()) {
672 case GlobalValue::LinkOnceLinkage:
673 case GlobalValue::WeakLinkage:
674 O << "\t.global " << name << '\n'
675 << "\t.type " << name << ", @object\n"
676 << "\t.weak " << name << '\n';
677 SwitchToDataSection("\t.data", I);
679 case GlobalValue::AppendingLinkage:
680 // FIXME: appending linkage variables should go into a section of
681 // their name or something. For now, just emit them as external.
682 case GlobalValue::ExternalLinkage:
683 // If external or appending, declare as a global symbol
684 O << "\t.global " << name << "\n"
685 << "\t.type " << name << ", @object\n";
687 case GlobalValue::InternalLinkage:
688 if (I->isConstant()) {
689 const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
690 if (TAI->getCStringSection() && CVA && CVA->isCString()) {
691 SwitchToDataSection(TAI->getCStringSection(), I);
696 // FIXME: special handling for ".ctors" & ".dtors" sections
697 if (I->hasSection() &&
698 (I->getSection() == ".ctors" ||
699 I->getSection() == ".dtors")) {
700 std::string SectionName = ".section " + I->getSection()
701 + ",\"aw\",@progbits";
702 SwitchToDataSection(SectionName.c_str());
704 SwitchToDataSection(TAI->getDataSection(), I);
708 cerr << "Unknown linkage type!";
712 EmitAlignment(Align, I);
713 O << name << ":\t\t\t\t" << TAI->getCommentString() << " '"
714 << I->getName() << "'\n";
716 // If the initializer is a extern weak symbol, remember to emit the weak
718 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
719 if (GV->hasExternalWeakLinkage())
720 ExtWeakSymbols.insert(GV);
722 EmitGlobalConstant(C);
729 // Emit initial debug information.
732 AsmPrinter::doFinalization(M);
733 return false; // success
736 std::string LinuxAsmPrinter::getSectionForFunction(const Function &F) const {
737 switch (F.getLinkage()) {
738 default: assert(0 && "Unknown linkage type!");
739 case Function::ExternalLinkage:
740 case Function::InternalLinkage: return TAI->getTextSection();
741 case Function::WeakLinkage:
742 case Function::LinkOnceLinkage:
747 std::string DarwinAsmPrinter::getSectionForFunction(const Function &F) const {
748 switch (F.getLinkage()) {
749 default: assert(0 && "Unknown linkage type!");
750 case Function::ExternalLinkage:
751 case Function::InternalLinkage: return TAI->getTextSection();
752 case Function::WeakLinkage:
753 case Function::LinkOnceLinkage:
754 return ".section __TEXT,__textcoal_nt,coalesced,pure_instructions";
758 /// runOnMachineFunction - This uses the printMachineInstruction()
759 /// method to print assembly for each instruction.
761 bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
762 DW.SetModuleInfo(&getAnalysis<MachineModuleInfo>());
764 SetupMachineFunction(MF);
767 // Print out constants referenced by the function
768 EmitConstantPool(MF.getConstantPool());
770 // Print out labels for the function.
771 const Function *F = MF.getFunction();
772 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
774 switch (F->getLinkage()) {
775 default: assert(0 && "Unknown linkage type!");
776 case Function::InternalLinkage: // Symbols default to internal.
778 case Function::ExternalLinkage:
779 O << "\t.globl\t" << CurrentFnName << "\n";
781 case Function::WeakLinkage:
782 case Function::LinkOnceLinkage:
783 O << "\t.globl\t" << CurrentFnName << "\n";
784 O << "\t.weak_definition\t" << CurrentFnName << "\n";
788 if (F->hasHiddenVisibility())
789 if (const char *Directive = TAI->getHiddenDirective())
790 O << Directive << CurrentFnName << "\n";
793 O << CurrentFnName << ":\n";
795 // Emit pre-function debug information.
796 DW.BeginFunction(&MF);
798 // Print out code for the function.
799 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
801 // Print a label for the basic block.
802 if (I != MF.begin()) {
803 printBasicBlockLabel(I, true);
806 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
808 // Print the assembly for the instruction.
810 printMachineInstruction(II);
814 // Print out jump tables referenced by the function.
815 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
817 // Emit post-function debug information.
820 // We didn't modify anything.
825 bool DarwinAsmPrinter::doInitialization(Module &M) {
826 static const char *CPUDirectives[] = {
837 unsigned Directive = Subtarget.getDarwinDirective();
838 if (Subtarget.isGigaProcessor() && Directive < PPC::DIR_970)
839 Directive = PPC::DIR_970;
840 if (Subtarget.hasAltivec() && Directive < PPC::DIR_7400)
841 Directive = PPC::DIR_7400;
842 if (Subtarget.isPPC64() && Directive < PPC::DIR_970)
843 Directive = PPC::DIR_64;
844 assert(Directive <= PPC::DIR_64 && "Directive out of range.");
845 O << "\t.machine " << CPUDirectives[Directive] << "\n";
847 AsmPrinter::doInitialization(M);
849 // Darwin wants symbols to be quoted if they have complex names.
850 Mang->setUseQuotes(true);
852 // Prime text sections so they are adjacent. This reduces the likelihood a
853 // large data or debug section causes a branch to exceed 16M limit.
854 SwitchToTextSection(".section __TEXT,__textcoal_nt,coalesced,"
855 "pure_instructions");
856 if (TM.getRelocationModel() == Reloc::PIC_) {
857 SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs,"
858 "pure_instructions,32");
859 } else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
860 SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs,"
861 "pure_instructions,16");
863 SwitchToTextSection(TAI->getTextSection());
865 // Emit initial debug information.
870 bool DarwinAsmPrinter::doFinalization(Module &M) {
871 const TargetData *TD = TM.getTargetData();
873 // Print out module-level global variables here.
874 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
876 if (!I->hasInitializer()) continue; // External global require no code
878 // Check to see if this is a special global used by LLVM, if so, emit it.
879 if (EmitSpecialLLVMGlobal(I)) {
880 if (TM.getRelocationModel() == Reloc::Static) {
881 if (I->getName() == "llvm.global_ctors")
882 O << ".reference .constructors_used\n";
883 else if (I->getName() == "llvm.global_dtors")
884 O << ".reference .destructors_used\n";
889 std::string name = Mang->getValueName(I);
891 if (I->hasHiddenVisibility())
892 if (const char *Directive = TAI->getHiddenDirective())
893 O << Directive << name << "\n";
895 Constant *C = I->getInitializer();
896 unsigned Size = TD->getTypeSize(C->getType());
897 unsigned Align = TD->getPreferredAlignmentLog(I);
899 if (C->isNullValue() && /* FIXME: Verify correct */
900 (I->hasInternalLinkage() || I->hasWeakLinkage() ||
901 I->hasLinkOnceLinkage() ||
902 (I->hasExternalLinkage() && !I->hasSection()))) {
903 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
904 if (I->hasExternalLinkage()) {
905 O << "\t.globl " << name << '\n';
906 O << "\t.zerofill __DATA, __common, " << name << ", "
907 << Size << ", " << Align;
908 } else if (I->hasInternalLinkage()) {
909 SwitchToDataSection("\t.data", I);
910 O << TAI->getLCOMMDirective() << name << "," << Size << "," << Align;
912 SwitchToDataSection("\t.data", I);
913 O << ".comm " << name << "," << Size;
915 O << "\t\t" << TAI->getCommentString() << " '" << I->getName() << "'\n";
917 switch (I->getLinkage()) {
918 case GlobalValue::LinkOnceLinkage:
919 case GlobalValue::WeakLinkage:
920 O << "\t.globl " << name << '\n'
921 << "\t.weak_definition " << name << '\n';
922 SwitchToDataSection(".section __DATA,__datacoal_nt,coalesced", I);
924 case GlobalValue::AppendingLinkage:
925 // FIXME: appending linkage variables should go into a section of
926 // their name or something. For now, just emit them as external.
927 case GlobalValue::ExternalLinkage:
928 // If external or appending, declare as a global symbol
929 O << "\t.globl " << name << "\n";
931 case GlobalValue::InternalLinkage:
932 if (I->isConstant()) {
933 const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
934 if (TAI->getCStringSection() && CVA && CVA->isCString()) {
935 SwitchToDataSection(TAI->getCStringSection(), I);
940 SwitchToDataSection("\t.data", I);
943 cerr << "Unknown linkage type!";
947 EmitAlignment(Align, I);
948 O << name << ":\t\t\t\t" << TAI->getCommentString() << " '"
949 << I->getName() << "'\n";
951 // If the initializer is a extern weak symbol, remember to emit the weak
953 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
954 if (GV->hasExternalWeakLinkage())
955 ExtWeakSymbols.insert(GV);
957 EmitGlobalConstant(C);
962 bool isPPC64 = TD->getPointerSizeInBits() == 64;
964 // Output stubs for dynamically-linked functions
965 if (TM.getRelocationModel() == Reloc::PIC_) {
966 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
968 SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs,"
969 "pure_instructions,32");
971 O << "L" << *i << "$stub:\n";
972 O << "\t.indirect_symbol " << *i << "\n";
974 O << "\tbcl 20,31,L0$" << *i << "\n";
975 O << "L0$" << *i << ":\n";
977 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n";
980 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
982 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
983 O << "\tmtctr r12\n";
985 SwitchToDataSection(".lazy_symbol_pointer");
986 O << "L" << *i << "$lazy_ptr:\n";
987 O << "\t.indirect_symbol " << *i << "\n";
989 O << "\t.quad dyld_stub_binding_helper\n";
991 O << "\t.long dyld_stub_binding_helper\n";
994 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
996 SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs,"
997 "pure_instructions,16");
999 O << "L" << *i << "$stub:\n";
1000 O << "\t.indirect_symbol " << *i << "\n";
1001 O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n";
1003 O << "\tldu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
1005 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
1006 O << "\tmtctr r12\n";
1008 SwitchToDataSection(".lazy_symbol_pointer");
1009 O << "L" << *i << "$lazy_ptr:\n";
1010 O << "\t.indirect_symbol " << *i << "\n";
1012 O << "\t.quad dyld_stub_binding_helper\n";
1014 O << "\t.long dyld_stub_binding_helper\n";
1020 // Output stubs for external and common global variables.
1021 if (GVStubs.begin() != GVStubs.end()) {
1022 SwitchToDataSection(".non_lazy_symbol_pointer");
1023 for (std::set<std::string>::iterator I = GVStubs.begin(),
1024 E = GVStubs.end(); I != E; ++I) {
1025 O << "L" << *I << "$non_lazy_ptr:\n";
1026 O << "\t.indirect_symbol " << *I << "\n";
1028 O << "\t.quad\t0\n";
1030 O << "\t.long\t0\n";
1035 // Emit initial debug information.
1038 // Funny Darwin hack: This flag tells the linker that no global symbols
1039 // contain code that falls through to other global symbols (e.g. the obvious
1040 // implementation of multiple entry points). If this doesn't occur, the
1041 // linker can safely perform dead code stripping. Since LLVM never generates
1042 // code that does this, it is always safe to set.
1043 O << "\t.subsections_via_symbols\n";
1045 AsmPrinter::doFinalization(M);
1046 return false; // success
1051 /// createPPCAsmPrinterPass - Returns a pass that prints the PPC assembly code
1052 /// for a MachineFunction to the given output stream, in a format that the
1053 /// Darwin assembler can deal with.
1055 FunctionPass *llvm::createPPCAsmPrinterPass(std::ostream &o,
1056 PPCTargetMachine &tm) {
1057 const PPCSubtarget *Subtarget = &tm.getSubtarget<PPCSubtarget>();
1059 if (Subtarget->isDarwin()) {
1060 return new DarwinAsmPrinter(o, tm, tm.getTargetAsmInfo());
1062 return new LinuxAsmPrinter(o, tm, tm.getTargetAsmInfo());