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Added llvmgcc version to allow tests to be xfailed by frontend version.
[llvm-complete.git] / lib / Target / PowerPC / PPCAsmPrinter.cpp
blobb34bf9a8a217813c7962856a2e971d494b1eac28
1 //===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --------=//
2 //
3 // The LLVM Compiler Infrastructure
4 //
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.
7 //
8 //===----------------------------------------------------------------------===//
9 //
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'.
13 //
14 // Documentation at http://developer.apple.com/documentation/DeveloperTools/
15 // Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
16 //
17 //===----------------------------------------------------------------------===//
18
19 #define DEBUG_TYPE "asmprinter"
20 #include "PPC.h"
21 #include "PPCTargetMachine.h"
22 #include "PPCSubtarget.h"
23 #include "llvm/Constants.h"
24 #include "llvm/DerivedTypes.h"
25 #include "llvm/Module.h"
26 #include "llvm/Assembly/Writer.h"
27 #include "llvm/CodeGen/AsmPrinter.h"
28 #include "llvm/CodeGen/DwarfWriter.h"
29 #include "llvm/CodeGen/MachineDebugInfo.h"
30 #include "llvm/CodeGen/MachineFunctionPass.h"
31 #include "llvm/CodeGen/MachineInstr.h"
32 #include "llvm/Support/Mangler.h"
33 #include "llvm/Support/MathExtras.h"
34 #include "llvm/Support/CommandLine.h"
35 #include "llvm/Support/Debug.h"
36 #include "llvm/Target/MRegisterInfo.h"
37 #include "llvm/Target/TargetInstrInfo.h"
38 #include "llvm/Target/TargetOptions.h"
39 #include "llvm/ADT/Statistic.h"
40 #include "llvm/ADT/StringExtras.h"
41 #include <iostream>
42 #include <set>
43 using namespace llvm;
44
45 namespace {
46 Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
47
48 class PPCAsmPrinter : public AsmPrinter {
49 public:
50 std::set<std::string> FnStubs, GVStubs;
51
52 PPCAsmPrinter(std::ostream &O, TargetMachine &TM)
53 : AsmPrinter(O, TM) {}
54
55 virtual const char *getPassName() const {
56 return "PowerPC Assembly Printer";
57 }
58
59 PPCTargetMachine &getTM() {
60 return static_cast<PPCTargetMachine&>(TM);
61 }
62
63 unsigned enumRegToMachineReg(unsigned enumReg) {
64 switch (enumReg) {
65 default: assert(0 && "Unhandled register!"); break;
66 case PPC::CR0: return 0;
67 case PPC::CR1: return 1;
68 case PPC::CR2: return 2;
69 case PPC::CR3: return 3;
70 case PPC::CR4: return 4;
71 case PPC::CR5: return 5;
72 case PPC::CR6: return 6;
73 case PPC::CR7: return 7;
74 }
75 abort();
76 }
77
78 /// printInstruction - This method is automatically generated by tablegen
79 /// from the instruction set description. This method returns true if the
80 /// machine instruction was sufficiently described to print it, otherwise it
81 /// returns false.
82 bool printInstruction(const MachineInstr *MI);
83
84 void printMachineInstruction(const MachineInstr *MI);
85 void printOp(const MachineOperand &MO);
86
87 void printOperand(const MachineInstr *MI, unsigned OpNo) {
88 const MachineOperand &MO = MI->getOperand(OpNo);
89 if (MO.getType() == MachineOperand::MO_MachineRegister) {
90 assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
91 O << TM.getRegisterInfo()->get(MO.getReg()).Name;
92 } else if (MO.isImmediate()) {
93 O << MO.getImmedValue();
94 } else {
95 printOp(MO);
96 }
97 }
98
99 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
100 unsigned AsmVariant, const char *ExtraCode);
101 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
102 unsigned AsmVariant, const char *ExtraCode);
103
104
105 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
106 char value = MI->getOperand(OpNo).getImmedValue();
107 value = (value << (32-5)) >> (32-5);
108 O << (int)value;
109 }
110 void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
111 unsigned char value = MI->getOperand(OpNo).getImmedValue();
112 assert(value <= 31 && "Invalid u5imm argument!");
113 O << (unsigned int)value;
114 }
115 void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) {
116 unsigned char value = MI->getOperand(OpNo).getImmedValue();
117 assert(value <= 63 && "Invalid u6imm argument!");
118 O << (unsigned int)value;
119 }
120 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
121 O << (short)MI->getOperand(OpNo).getImmedValue();
122 }
123 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
124 O << (unsigned short)MI->getOperand(OpNo).getImmedValue();
125 }
126 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
127 O << (short)MI->getOperand(OpNo).getImmedValue()*4;
128 }
129 void printBranchOperand(const MachineInstr *MI, unsigned OpNo) {
130 // Branches can take an immediate operand. This is used by the branch
131 // selection pass to print $+8, an eight byte displacement from the PC.
132 if (MI->getOperand(OpNo).isImmediate()) {
133 O << "$+" << MI->getOperand(OpNo).getImmedValue();
134 } else {
135 printOp(MI->getOperand(OpNo));
136 }
137 }
138 void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
139 const MachineOperand &MO = MI->getOperand(OpNo);
140 if (TM.getRelocationModel() != Reloc::Static) {
141 if (MO.getType() == MachineOperand::MO_GlobalAddress) {
142 GlobalValue *GV = MO.getGlobal();
143 if (((GV->isExternal() || GV->hasWeakLinkage() ||
144 GV->hasLinkOnceLinkage()))) {
145 // Dynamically-resolved functions need a stub for the function.
146 std::string Name = Mang->getValueName(GV);
147 FnStubs.insert(Name);
148 O << "L" << Name << "$stub";
149 return;
150 }
151 }
152 if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
153 std::string Name(GlobalPrefix); Name += MO.getSymbolName();
154 FnStubs.insert(Name);
155 O << "L" << Name << "$stub";
156 return;
157 }
158 }
159
160 printOp(MI->getOperand(OpNo));
161 }
162 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
163 O << (int)MI->getOperand(OpNo).getImmedValue()*4;
164 }
165 void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
166 O << "\"L" << getFunctionNumber() << "$pb\"\n";
167 O << "\"L" << getFunctionNumber() << "$pb\":";
168 }
169 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
170 if (MI->getOperand(OpNo).isImmediate()) {
171 printS16ImmOperand(MI, OpNo);
172 } else {
173 O << "ha16(";
174 printOp(MI->getOperand(OpNo));
175 if (TM.getRelocationModel() == Reloc::PIC)
176 O << "-\"L" << getFunctionNumber() << "$pb\")";
177 else
178 O << ')';
179 }
180 }
181 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
182 if (MI->getOperand(OpNo).isImmediate()) {
183 printS16ImmOperand(MI, OpNo);
184 } else {
185 O << "lo16(";
186 printOp(MI->getOperand(OpNo));
187 if (TM.getRelocationModel() == Reloc::PIC)
188 O << "-\"L" << getFunctionNumber() << "$pb\")";
189 else
190 O << ')';
191 }
192 }
193 void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
194 unsigned CCReg = MI->getOperand(OpNo).getReg();
195 unsigned RegNo = enumRegToMachineReg(CCReg);
196 O << (0x80 >> RegNo);
197 }
198 // The new addressing mode printers.
199 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
200 printSymbolLo(MI, OpNo);
201 O << '(';
202 if (MI->getOperand(OpNo+1).isRegister() &&
203 MI->getOperand(OpNo+1).getReg() == PPC::R0)
204 O << "0";
205 else
206 printOperand(MI, OpNo+1);
207 O << ')';
208 }
209 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) {
210 if (MI->getOperand(OpNo).isImmediate())
211 printS16X4ImmOperand(MI, OpNo);
212 else
213 printSymbolLo(MI, OpNo);
214 O << '(';
215 if (MI->getOperand(OpNo+1).isRegister() &&
216 MI->getOperand(OpNo+1).getReg() == PPC::R0)
217 O << "0";
218 else
219 printOperand(MI, OpNo+1);
220 O << ')';
221 }
222
223 void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
224 // When used as the base register, r0 reads constant zero rather than
225 // the value contained in the register. For this reason, the darwin
226 // assembler requires that we print r0 as 0 (no r) when used as the base.
227 const MachineOperand &MO = MI->getOperand(OpNo);
228 if (MO.getReg() == PPC::R0)
229 O << '0';
230 else
231 O << TM.getRegisterInfo()->get(MO.getReg()).Name;
232 O << ", ";
233 printOperand(MI, OpNo+1);
234 }
235
236 virtual bool runOnMachineFunction(MachineFunction &F) = 0;
237 virtual bool doFinalization(Module &M) = 0;
238
239 };
240
241 /// DarwinDwarfWriter - Dwarf debug info writer customized for Darwin/Mac OS X
242 ///
243 struct DarwinDwarfWriter : public DwarfWriter {
244 // Ctor.
245 DarwinDwarfWriter(std::ostream &o, AsmPrinter *ap)
246 : DwarfWriter(o, ap)
247 {
248 needsSet = true;
249 DwarfAbbrevSection = ".section __DWARFA,__debug_abbrev";
250 DwarfInfoSection = ".section __DWARFA,__debug_info";
251 DwarfLineSection = ".section __DWARFA,__debug_line";
252 DwarfFrameSection = ".section __DWARFA,__debug_frame";
253 DwarfPubNamesSection = ".section __DWARFA,__debug_pubnames";
254 DwarfPubTypesSection = ".section __DWARFA,__debug_pubtypes";
255 DwarfStrSection = ".section __DWARFA,__debug_str";
256 DwarfLocSection = ".section __DWARFA,__debug_loc";
257 DwarfARangesSection = ".section __DWARFA,__debug_aranges";
258 DwarfRangesSection = ".section __DWARFA,__debug_ranges";
259 DwarfMacInfoSection = ".section __DWARFA,__debug_macinfo";
260 TextSection = ".text";
261 DataSection = ".data";
262 }
263 };
264
265 /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS
266 /// X
267 struct DarwinAsmPrinter : public PPCAsmPrinter {
268
269 DarwinDwarfWriter DW;
270
271 DarwinAsmPrinter(std::ostream &O, TargetMachine &TM)
272 : PPCAsmPrinter(O, TM), DW(O, this) {
273 CommentString = ";";
274 GlobalPrefix = "_";
275 PrivateGlobalPrefix = "L"; // Marker for constant pool idxs
276 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
277 Data64bitsDirective = 0; // we can't emit a 64-bit unit
278 AlignmentIsInBytes = false; // Alignment is by power of 2.
279 ConstantPoolSection = "\t.const\t";
280 LCOMMDirective = "\t.lcomm\t";
281 StaticCtorsSection = ".mod_init_func";
282 StaticDtorsSection = ".mod_term_func";
283 InlineAsmStart = InlineAsmEnd = ""; // Don't use #APP/#NO_APP
284 }
285
286 virtual const char *getPassName() const {
287 return "Darwin PPC Assembly Printer";
288 }
289
290 bool runOnMachineFunction(MachineFunction &F);
291 bool doInitialization(Module &M);
292 bool doFinalization(Module &M);
293
294 void getAnalysisUsage(AnalysisUsage &AU) const {
295 AU.setPreservesAll();
296 AU.addRequired<MachineDebugInfo>();
297 PPCAsmPrinter::getAnalysisUsage(AU);
298 }
299
300 };
301
302 /// AIXAsmPrinter - PowerPC assembly printer, customized for AIX
303 ///
304 struct AIXAsmPrinter : public PPCAsmPrinter {
305 /// Map for labels corresponding to global variables
306 ///
307 std::map<const GlobalVariable*,std::string> GVToLabelMap;
308
309 AIXAsmPrinter(std::ostream &O, TargetMachine &TM)
310 : PPCAsmPrinter(O, TM) {
311 CommentString = "#";
312 GlobalPrefix = ".";
313 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
314 Data64bitsDirective = 0; // we can't emit a 64-bit unit
315 AlignmentIsInBytes = false; // Alignment is by power of 2.
316 ConstantPoolSection = "\t.const\t";
317 }
318
319 virtual const char *getPassName() const {
320 return "AIX PPC Assembly Printer";
321 }
322
323 bool runOnMachineFunction(MachineFunction &F);
324 bool doInitialization(Module &M);
325 bool doFinalization(Module &M);
326 };
327 } // end of anonymous namespace
328
329 /// createDarwinAsmPrinterPass - Returns a pass that prints the PPC assembly
330 /// code for a MachineFunction to the given output stream, in a format that the
331 /// Darwin assembler can deal with.
332 ///
333 FunctionPass *llvm::createDarwinAsmPrinter(std::ostream &o,
334 PPCTargetMachine &tm) {
335 return new DarwinAsmPrinter(o, tm);
336 }
337
338 /// createAIXAsmPrinterPass - Returns a pass that prints the PPC assembly code
339 /// for a MachineFunction to the given output stream, in a format that the
340 /// AIX 5L assembler can deal with.
341 ///
342 FunctionPass *llvm::createAIXAsmPrinter(std::ostream &o, PPCTargetMachine &tm) {
343 return new AIXAsmPrinter(o, tm);
344 }
345
346 // Include the auto-generated portion of the assembly writer
347 #include "PPCGenAsmWriter.inc"
348
349 void PPCAsmPrinter::printOp(const MachineOperand &MO) {
350 const MRegisterInfo &RI = *TM.getRegisterInfo();
351 int new_symbol;
352
353 switch (MO.getType()) {
354 case MachineOperand::MO_VirtualRegister:
355 if (Value *V = MO.getVRegValueOrNull()) {
356 O << "<" << V->getName() << ">";
357 return;
358 }
359 // FALLTHROUGH
360 case MachineOperand::MO_MachineRegister:
361 case MachineOperand::MO_CCRegister:
362 O << RI.get(MO.getReg()).Name;
363 return;
364
365 case MachineOperand::MO_SignExtendedImmed:
366 case MachineOperand::MO_UnextendedImmed:
367 std::cerr << "printOp() does not handle immediate values\n";
368 abort();
369 return;
370
371 case MachineOperand::MO_PCRelativeDisp:
372 std::cerr << "Shouldn't use addPCDisp() when building PPC MachineInstrs";
373 abort();
374 return;
375
376 case MachineOperand::MO_MachineBasicBlock: {
377 MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
378 O << PrivateGlobalPrefix << "BB" << getFunctionNumber() << "_"
379 << MBBOp->getNumber() << "\t; " << MBBOp->getBasicBlock()->getName();
380 return;
381 }
382
383 case MachineOperand::MO_ConstantPoolIndex:
384 O << PrivateGlobalPrefix << "CPI" << getFunctionNumber()
385 << '_' << MO.getConstantPoolIndex();
386 return;
387 case MachineOperand::MO_ExternalSymbol:
388 // Computing the address of an external symbol, not calling it.
389 if (TM.getRelocationModel() != Reloc::Static) {
390 std::string Name(GlobalPrefix); Name += MO.getSymbolName();
391 GVStubs.insert(Name);
392 O << "L" << Name << "$non_lazy_ptr";
393 return;
394 }
395 O << GlobalPrefix << MO.getSymbolName();
396 return;
397 case MachineOperand::MO_GlobalAddress: {
398 // Computing the address of a global symbol, not calling it.
399 GlobalValue *GV = MO.getGlobal();
400 std::string Name = Mang->getValueName(GV);
401 int offset = MO.getOffset();
402
403 // External or weakly linked global variables need non-lazily-resolved stubs
404 if (TM.getRelocationModel() != Reloc::Static) {
405 if (((GV->isExternal() || GV->hasWeakLinkage() ||
406 GV->hasLinkOnceLinkage()))) {
407 GVStubs.insert(Name);
408 O << "L" << Name << "$non_lazy_ptr";
409 return;
410 }
411 }
412
413 O << Name;
414 return;
415 }
416
417 default:
418 O << "<unknown operand type: " << MO.getType() << ">";
419 return;
420 }
421 }
422
423 /// PrintAsmOperand - Print out an operand for an inline asm expression.
424 ///
425 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
426 unsigned AsmVariant,
427 const char *ExtraCode) {
428 // Does this asm operand have a single letter operand modifier?
429 if (ExtraCode && ExtraCode[0]) {
430 if (ExtraCode[1] != 0) return true; // Unknown modifier.
431
432 switch (ExtraCode[0]) {
433 default: return true; // Unknown modifier.
434 case 'L': // Write second word of DImode reference.
435 // Verify that this operand has two consecutive registers.
436 if (!MI->getOperand(OpNo).isRegister() ||
437 OpNo+1 == MI->getNumOperands() ||
438 !MI->getOperand(OpNo+1).isRegister())
439 return true;
440 ++OpNo; // Return the high-part.
441 break;
442 }
443 }
444
445 printOperand(MI, OpNo);
446 return false;
447 }
448
449 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
450 unsigned AsmVariant,
451 const char *ExtraCode) {
452 if (ExtraCode && ExtraCode[0])
453 return true; // Unknown modifier.
454 printMemRegReg(MI, OpNo);
455 return false;
456 }
457
458 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
459 /// the current output stream.
460 ///
461 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
462 ++EmittedInsts;
463
464 // Check for slwi/srwi mnemonics.
465 if (MI->getOpcode() == PPC::RLWINM) {
466 bool FoundMnemonic = false;
467 unsigned char SH = MI->getOperand(2).getImmedValue();
468 unsigned char MB = MI->getOperand(3).getImmedValue();
469 unsigned char ME = MI->getOperand(4).getImmedValue();
470 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
471 O << "slwi "; FoundMnemonic = true;
472 }
473 if (SH <= 31 && MB == (32-SH) && ME == 31) {
474 O << "srwi "; FoundMnemonic = true;
475 SH = 32-SH;
476 }
477 if (FoundMnemonic) {
478 printOperand(MI, 0);
479 O << ", ";
480 printOperand(MI, 1);
481 O << ", " << (unsigned int)SH << "\n";
482 return;
483 }
484 } else if (MI->getOpcode() == PPC::OR4 || MI->getOpcode() == PPC::OR8) {
485 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
486 O << "mr ";
487 printOperand(MI, 0);
488 O << ", ";
489 printOperand(MI, 1);
490 O << "\n";
491 return;
492 }
493 }
494
495 if (printInstruction(MI))
496 return; // Printer was automatically generated
497
498 assert(0 && "Unhandled instruction in asm writer!");
499 abort();
500 return;
501 }
502
503
504 /// runOnMachineFunction - This uses the printMachineInstruction()
505 /// method to print assembly for each instruction.
506 ///
507 bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
508 // FIXME - is this the earliest this can be set?
509 DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>());
510
511 SetupMachineFunction(MF);
512 O << "\n\n";
513
514 // Print out constants referenced by the function
515 EmitConstantPool(MF.getConstantPool());
516
517 // Print out labels for the function.
518 const Function *F = MF.getFunction();
519 switch (F->getLinkage()) {
520 default: assert(0 && "Unknown linkage type!");
521 case Function::InternalLinkage: // Symbols default to internal.
522 SwitchSection(".text", F);
523 break;
524 case Function::ExternalLinkage:
525 SwitchSection(".text", F);
526 O << "\t.globl\t" << CurrentFnName << "\n";
527 break;
528 case Function::WeakLinkage:
529 case Function::LinkOnceLinkage:
530 SwitchSection(".section __TEXT,__textcoal_nt,coalesced,pure_instructions",
531 F);
532 O << "\t.globl\t" << CurrentFnName << "\n";
533 O << "\t.weak_definition\t" << CurrentFnName << "\n";
534 break;
535 }
536 EmitAlignment(4, F);
537 O << CurrentFnName << ":\n";
538
539 // Emit pre-function debug information.
540 DW.BeginFunction(&MF);
541
542 // Print out code for the function.
543 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
544 I != E; ++I) {
545 // Print a label for the basic block.
546 if (I != MF.begin()) {
547 O << PrivateGlobalPrefix << "BB" << getFunctionNumber() << '_'
548 << I->getNumber() << ":\t";
549 if (!I->getBasicBlock()->getName().empty())
550 O << CommentString << " " << I->getBasicBlock()->getName();
551 O << "\n";
552 }
553 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
554 II != E; ++II) {
555 // Print the assembly for the instruction.
556 O << "\t";
557 printMachineInstruction(II);
558 }
559 }
560
561 // Emit post-function debug information.
562 DW.EndFunction();
563
564 // We didn't modify anything.
565 return false;
566 }
567
568
569 bool DarwinAsmPrinter::doInitialization(Module &M) {
570 if (TM.getSubtarget<PPCSubtarget>().isGigaProcessor())
571 O << "\t.machine ppc970\n";
572 AsmPrinter::doInitialization(M);
573
574 // Darwin wants symbols to be quoted if they have complex names.
575 Mang->setUseQuotes(true);
576
577 // Emit initial debug information.
578 DW.BeginModule(&M);
579 return false;
580 }
581
582 bool DarwinAsmPrinter::doFinalization(Module &M) {
583 const TargetData &TD = TM.getTargetData();
584
585 // Print out module-level global variables here.
586 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
587 I != E; ++I) {
588 if (!I->hasInitializer()) continue; // External global require no code
589
590 // Check to see if this is a special global used by LLVM, if so, emit it.
591 if (EmitSpecialLLVMGlobal(I))
592 continue;
593
594 std::string name = Mang->getValueName(I);
595 Constant *C = I->getInitializer();
596 unsigned Size = TD.getTypeSize(C->getType());
597 unsigned Align = getPreferredAlignmentLog(I);
598
599 if (C->isNullValue() && /* FIXME: Verify correct */
600 (I->hasInternalLinkage() || I->hasWeakLinkage() ||
601 I->hasLinkOnceLinkage() ||
602 (I->hasExternalLinkage() && !I->hasSection()))) {
603 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
604 if (I->hasExternalLinkage()) {
605 O << "\t.globl " << name << '\n';
606 O << "\t.zerofill __DATA, __common, " << name << ", "
607 << Size << ", " << Align;
608 } else if (I->hasInternalLinkage()) {
609 SwitchSection(".data", I);
610 O << LCOMMDirective << name << "," << Size << "," << Align;
611 } else {
612 SwitchSection(".data", I);
613 O << ".comm " << name << "," << Size;
614 }
615 O << "\t\t; '" << I->getName() << "'\n";
616 } else {
617 switch (I->getLinkage()) {
618 case GlobalValue::LinkOnceLinkage:
619 case GlobalValue::WeakLinkage:
620 O << "\t.globl " << name << '\n'
621 << "\t.weak_definition " << name << '\n';
622 SwitchSection(".section __DATA,__datacoal_nt,coalesced", I);
623 break;
624 case GlobalValue::AppendingLinkage:
625 // FIXME: appending linkage variables should go into a section of
626 // their name or something. For now, just emit them as external.
627 case GlobalValue::ExternalLinkage:
628 // If external or appending, declare as a global symbol
629 O << "\t.globl " << name << "\n";
630 // FALL THROUGH
631 case GlobalValue::InternalLinkage:
632 SwitchSection(".data", I);
633 break;
634 default:
635 std::cerr << "Unknown linkage type!";
636 abort();
637 }
638
639 EmitAlignment(Align, I);
640 O << name << ":\t\t\t\t; '" << I->getName() << "'\n";
641 EmitGlobalConstant(C);
642 O << '\n';
643 }
644 }
645
646 // Output stubs for dynamically-linked functions
647 if (TM.getRelocationModel() == Reloc::PIC) {
648 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
649 i != e; ++i) {
650 SwitchSection(".section __TEXT,__picsymbolstub1,symbol_stubs,"
651 "pure_instructions,32", 0);
652 EmitAlignment(2);
653 O << "L" << *i << "$stub:\n";
654 O << "\t.indirect_symbol " << *i << "\n";
655 O << "\tmflr r0\n";
656 O << "\tbcl 20,31,L0$" << *i << "\n";
657 O << "L0$" << *i << ":\n";
658 O << "\tmflr r11\n";
659 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n";
660 O << "\tmtlr r0\n";
661 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
662 O << "\tmtctr r12\n";
663 O << "\tbctr\n";
664 SwitchSection(".lazy_symbol_pointer", 0);
665 O << "L" << *i << "$lazy_ptr:\n";
666 O << "\t.indirect_symbol " << *i << "\n";
667 O << "\t.long dyld_stub_binding_helper\n";
668 }
669 } else {
670 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
671 i != e; ++i) {
672 SwitchSection(".section __TEXT,__symbol_stub1,symbol_stubs,"
673 "pure_instructions,16", 0);
674 EmitAlignment(4);
675 O << "L" << *i << "$stub:\n";
676 O << "\t.indirect_symbol " << *i << "\n";
677 O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n";
678 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
679 O << "\tmtctr r12\n";
680 O << "\tbctr\n";
681 SwitchSection(".lazy_symbol_pointer", 0);
682 O << "L" << *i << "$lazy_ptr:\n";
683 O << "\t.indirect_symbol " << *i << "\n";
684 O << "\t.long dyld_stub_binding_helper\n";
685 }
686 }
687
688 O << "\n";
689
690 // Output stubs for external and common global variables.
691 if (GVStubs.begin() != GVStubs.end()) {
692 SwitchSection(".non_lazy_symbol_pointer", 0);
693 for (std::set<std::string>::iterator I = GVStubs.begin(),
694 E = GVStubs.end(); I != E; ++I) {
695 O << "L" << *I << "$non_lazy_ptr:\n";
696 O << "\t.indirect_symbol " << *I << "\n";
697 O << "\t.long\t0\n";
698 }
699 }
700
701 // Emit initial debug information.
702 DW.EndModule();
703
704 // Funny Darwin hack: This flag tells the linker that no global symbols
705 // contain code that falls through to other global symbols (e.g. the obvious
706 // implementation of multiple entry points). If this doesn't occur, the
707 // linker can safely perform dead code stripping. Since LLVM never generates
708 // code that does this, it is always safe to set.
709 O << "\t.subsections_via_symbols\n";
710
711 AsmPrinter::doFinalization(M);
712 return false; // success
713 }
714
715 /// runOnMachineFunction - This uses the e()
716 /// method to print assembly for each instruction.
717 ///
718 bool AIXAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
719 SetupMachineFunction(MF);
720
721 // Print out constants referenced by the function
722 EmitConstantPool(MF.getConstantPool());
723
724 // Print out header for the function.
725 O << "\t.csect .text[PR]\n"
726 << "\t.align 2\n"
727 << "\t.globl " << CurrentFnName << '\n'
728 << "\t.globl ." << CurrentFnName << '\n'
729 << "\t.csect " << CurrentFnName << "[DS],3\n"
730 << CurrentFnName << ":\n"
731 << "\t.llong ." << CurrentFnName << ", TOC[tc0], 0\n"
732 << "\t.csect .text[PR]\n"
733 << '.' << CurrentFnName << ":\n";
734
735 // Print out code for the function.
736 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
737 I != E; ++I) {
738 // Print a label for the basic block.
739 O << PrivateGlobalPrefix << "BB" << getFunctionNumber() << '_'
740 << I->getNumber()
741 << ":\t" << CommentString << I->getBasicBlock()->getName() << '\n';
742 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
743 II != E; ++II) {
744 // Print the assembly for the instruction.
745 O << "\t";
746 printMachineInstruction(II);
747 }
748 }
749
750 O << "LT.." << CurrentFnName << ":\n"
751 << "\t.long 0\n"
752 << "\t.byte 0,0,32,65,128,0,0,0\n"
753 << "\t.long LT.." << CurrentFnName << "-." << CurrentFnName << '\n'
754 << "\t.short 3\n"
755 << "\t.byte \"" << CurrentFnName << "\"\n"
756 << "\t.align 2\n";
757
758 // We didn't modify anything.
759 return false;
760 }
761
762 bool AIXAsmPrinter::doInitialization(Module &M) {
763 SwitchSection("", 0);
764 const TargetData &TD = TM.getTargetData();
765
766 O << "\t.machine \"ppc64\"\n"
767 << "\t.toc\n"
768 << "\t.csect .text[PR]\n";
769
770 // Print out module-level global variables
771 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
772 I != E; ++I) {
773 if (!I->hasInitializer())
774 continue;
775
776 std::string Name = I->getName();
777 Constant *C = I->getInitializer();
778 // N.B.: We are defaulting to writable strings
779 if (I->hasExternalLinkage()) {
780 O << "\t.globl " << Name << '\n'
781 << "\t.csect .data[RW],3\n";
782 } else {
783 O << "\t.csect _global.rw_c[RW],3\n";
784 }
785 O << Name << ":\n";
786 EmitGlobalConstant(C);
787 }
788
789 // Output labels for globals
790 if (M.global_begin() != M.global_end()) O << "\t.toc\n";
791 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
792 I != E; ++I) {
793 const GlobalVariable *GV = I;
794 // Do not output labels for unused variables
795 if (GV->isExternal() && GV->use_begin() == GV->use_end())
796 continue;
797
798 IncrementFunctionNumber();
799 std::string Name = GV->getName();
800 std::string Label = "LC.." + utostr(getFunctionNumber());
801 GVToLabelMap[GV] = Label;
802 O << Label << ":\n"
803 << "\t.tc " << Name << "[TC]," << Name;
804 if (GV->isExternal()) O << "[RW]";
805 O << '\n';
806 }
807
808 AsmPrinter::doInitialization(M);
809 return false; // success
810 }
811
812 bool AIXAsmPrinter::doFinalization(Module &M) {
813 const TargetData &TD = TM.getTargetData();
814 // Print out module-level global variables
815 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
816 I != E; ++I) {
817 if (I->hasInitializer() || I->hasExternalLinkage())
818 continue;
819
820 std::string Name = I->getName();
821 if (I->hasInternalLinkage()) {
822 O << "\t.lcomm " << Name << ",16,_global.bss_c";
823 } else {
824 O << "\t.comm " << Name << "," << TD.getTypeSize(I->getType())
825 << "," << Log2_32((unsigned)TD.getTypeAlignment(I->getType()));
826 }
827 O << "\t\t" << CommentString << " ";
828 WriteAsOperand(O, I, false, true, &M);
829 O << "\n";
830 }
831
832 O << "_section_.text:\n"
833 << "\t.csect .data[RW],3\n"
834 << "\t.llong _section_.text\n";
835 AsmPrinter::doFinalization(M);
836 return false; // success
837 }
The low level virtual machine