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 "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"
46 Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
48 class PPCAsmPrinter : public AsmPrinter {
50 std::set<std::string> FnStubs, GVStubs;
52 PPCAsmPrinter(std::ostream &O, TargetMachine &TM)
53 : AsmPrinter(O, TM) {}
55 virtual const char *getPassName() const {
56 return "PowerPC Assembly Printer";
59 PPCTargetMachine &getTM() {
60 return static_cast<PPCTargetMachine&>(TM);
63 unsigned enumRegToMachineReg(unsigned 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;
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
82 bool printInstruction(const MachineInstr *MI);
84 void printMachineInstruction(const MachineInstr *MI);
85 void printOp(const MachineOperand &MO);
87 void printOperand(const MachineInstr *MI, unsigned OpNo) {
88 const MachineOperand &MO = MI->getOperand(OpNo);
89 if (MO.isRegister()) {
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();
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);
105 void printS5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
106 char value = MI->getOperand(OpNo).getImmedValue();
107 value = (value << (32-5)) >> (32-5);
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;
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;
120 void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
121 O << (short)MI->getOperand(OpNo).getImmedValue();
123 void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
124 O << (unsigned short)MI->getOperand(OpNo).getImmedValue();
126 void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
127 O << (short)MI->getOperand(OpNo).getImmedValue()*4;
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();
135 printOp(MI->getOperand(OpNo));
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 << "$stub";
152 if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
153 std::string Name(GlobalPrefix); Name += MO.getSymbolName();
154 FnStubs.insert(Name);
155 O << "L" << Name << "$stub";
160 printOp(MI->getOperand(OpNo));
162 void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
163 O << (int)MI->getOperand(OpNo).getImmedValue()*4;
165 void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
166 O << "\"L" << getFunctionNumber() << "$pb\"\n";
167 O << "\"L" << getFunctionNumber() << "$pb\":";
169 void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
170 if (MI->getOperand(OpNo).isImmediate()) {
171 printS16ImmOperand(MI, OpNo);
174 printOp(MI->getOperand(OpNo));
175 if (TM.getRelocationModel() == Reloc::PIC)
176 O << "-\"L" << getFunctionNumber() << "$pb\")";
181 void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
182 if (MI->getOperand(OpNo).isImmediate()) {
183 printS16ImmOperand(MI, OpNo);
186 printOp(MI->getOperand(OpNo));
187 if (TM.getRelocationModel() == Reloc::PIC)
188 O << "-\"L" << getFunctionNumber() << "$pb\")";
193 void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
194 unsigned CCReg = MI->getOperand(OpNo).getReg();
195 unsigned RegNo = enumRegToMachineReg(CCReg);
196 O << (0x80 >> RegNo);
198 // The new addressing mode printers.
199 void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
200 printSymbolLo(MI, OpNo);
202 if (MI->getOperand(OpNo+1).isRegister() &&
203 MI->getOperand(OpNo+1).getReg() == PPC::R0)
206 printOperand(MI, OpNo+1);
209 void printMemRegImmShifted(const MachineInstr *MI, unsigned OpNo) {
210 if (MI->getOperand(OpNo).isImmediate())
211 printS16X4ImmOperand(MI, OpNo);
213 printSymbolLo(MI, OpNo);
215 if (MI->getOperand(OpNo+1).isRegister() &&
216 MI->getOperand(OpNo+1).getReg() == PPC::R0)
219 printOperand(MI, OpNo+1);
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)
231 O << TM.getRegisterInfo()->get(MO.getReg()).Name;
233 printOperand(MI, OpNo+1);
236 virtual bool runOnMachineFunction(MachineFunction &F) = 0;
237 virtual bool doFinalization(Module &M) = 0;
241 /// DarwinDwarfWriter - Dwarf debug info writer customized for Darwin/Mac OS X
243 struct DarwinDwarfWriter : public DwarfWriter {
245 DarwinDwarfWriter(std::ostream &o, AsmPrinter *ap)
249 DwarfAbbrevSection = ".section __DWARF,__debug_abbrev";
250 DwarfInfoSection = ".section __DWARF,__debug_info";
251 DwarfLineSection = ".section __DWARF,__debug_line";
252 DwarfFrameSection = ".section __DWARF,__debug_frame";
253 DwarfPubNamesSection = ".section __DWARF,__debug_pubnames";
254 DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes";
255 DwarfStrSection = ".section __DWARF,__debug_str";
256 DwarfLocSection = ".section __DWARF,__debug_loc";
257 DwarfARangesSection = ".section __DWARF,__debug_aranges";
258 DwarfRangesSection = ".section __DWARF,__debug_ranges";
259 DwarfMacInfoSection = ".section __DWARF,__debug_macinfo";
260 TextSection = ".text";
261 DataSection = ".data";
265 /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS
267 struct DarwinAsmPrinter : public PPCAsmPrinter {
269 DarwinDwarfWriter DW;
271 DarwinAsmPrinter(std::ostream &O, TargetMachine &TM)
272 : PPCAsmPrinter(O, TM), DW(O, this) {
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 // FIXME: Conditionalize jump table section based on PIC
281 JumpTableSection = ".const";
282 LCOMMDirective = "\t.lcomm\t";
283 StaticCtorsSection = ".mod_init_func";
284 StaticDtorsSection = ".mod_term_func";
285 InlineAsmStart = "# InlineAsm Start";
286 InlineAsmEnd = "# InlineAsm End";
289 virtual const char *getPassName() const {
290 return "Darwin PPC Assembly Printer";
293 bool runOnMachineFunction(MachineFunction &F);
294 bool doInitialization(Module &M);
295 bool doFinalization(Module &M);
297 void getAnalysisUsage(AnalysisUsage &AU) const {
298 AU.setPreservesAll();
299 AU.addRequired<MachineDebugInfo>();
300 PPCAsmPrinter::getAnalysisUsage(AU);
305 /// AIXAsmPrinter - PowerPC assembly printer, customized for AIX
307 struct AIXAsmPrinter : public PPCAsmPrinter {
308 /// Map for labels corresponding to global variables
310 std::map<const GlobalVariable*,std::string> GVToLabelMap;
312 AIXAsmPrinter(std::ostream &O, TargetMachine &TM)
313 : PPCAsmPrinter(O, TM) {
316 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
317 Data64bitsDirective = 0; // we can't emit a 64-bit unit
318 AlignmentIsInBytes = false; // Alignment is by power of 2.
319 ConstantPoolSection = "\t.const\t";
322 virtual const char *getPassName() const {
323 return "AIX PPC Assembly Printer";
326 bool runOnMachineFunction(MachineFunction &F);
327 bool doInitialization(Module &M);
328 bool doFinalization(Module &M);
330 } // end of anonymous namespace
332 /// createDarwinAsmPrinterPass - Returns a pass that prints the PPC assembly
333 /// code for a MachineFunction to the given output stream, in a format that the
334 /// Darwin assembler can deal with.
336 FunctionPass *llvm::createDarwinAsmPrinter(std::ostream &o,
337 PPCTargetMachine &tm) {
338 return new DarwinAsmPrinter(o, tm);
341 /// createAIXAsmPrinterPass - Returns a pass that prints the PPC assembly code
342 /// for a MachineFunction to the given output stream, in a format that the
343 /// AIX 5L assembler can deal with.
345 FunctionPass *llvm::createAIXAsmPrinter(std::ostream &o, PPCTargetMachine &tm) {
346 return new AIXAsmPrinter(o, tm);
349 // Include the auto-generated portion of the assembly writer
350 #include "PPCGenAsmWriter.inc"
352 void PPCAsmPrinter::printOp(const MachineOperand &MO) {
353 switch (MO.getType()) {
354 case MachineOperand::MO_Immediate:
355 std::cerr << "printOp() does not handle immediate values\n";
359 case MachineOperand::MO_MachineBasicBlock:
360 printBasicBlockLabel(MO.getMachineBasicBlock());
362 case MachineOperand::MO_JumpTableIndex:
363 O << PrivateGlobalPrefix << "JTI" << getFunctionNumber()
364 << '_' << MO.getJumpTableIndex();
365 // FIXME: PIC relocation model
367 case MachineOperand::MO_ConstantPoolIndex:
368 O << PrivateGlobalPrefix << "CPI" << getFunctionNumber()
369 << '_' << MO.getConstantPoolIndex();
371 case MachineOperand::MO_ExternalSymbol:
372 // Computing the address of an external symbol, not calling it.
373 if (TM.getRelocationModel() != Reloc::Static) {
374 std::string Name(GlobalPrefix); Name += MO.getSymbolName();
375 GVStubs.insert(Name);
376 O << "L" << Name << "$non_lazy_ptr";
379 O << GlobalPrefix << MO.getSymbolName();
381 case MachineOperand::MO_GlobalAddress: {
382 // Computing the address of a global symbol, not calling it.
383 GlobalValue *GV = MO.getGlobal();
384 std::string Name = Mang->getValueName(GV);
385 int offset = MO.getOffset();
387 // External or weakly linked global variables need non-lazily-resolved stubs
388 if (TM.getRelocationModel() != Reloc::Static) {
389 if (((GV->isExternal() || GV->hasWeakLinkage() ||
390 GV->hasLinkOnceLinkage()))) {
391 GVStubs.insert(Name);
392 O << "L" << Name << "$non_lazy_ptr";
402 O << "<unknown operand type: " << MO.getType() << ">";
407 /// PrintAsmOperand - Print out an operand for an inline asm expression.
409 bool PPCAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
411 const char *ExtraCode) {
412 // Does this asm operand have a single letter operand modifier?
413 if (ExtraCode && ExtraCode[0]) {
414 if (ExtraCode[1] != 0) return true; // Unknown modifier.
416 switch (ExtraCode[0]) {
417 default: return true; // Unknown modifier.
418 case 'L': // Write second word of DImode reference.
419 // Verify that this operand has two consecutive registers.
420 if (!MI->getOperand(OpNo).isRegister() ||
421 OpNo+1 == MI->getNumOperands() ||
422 !MI->getOperand(OpNo+1).isRegister())
424 ++OpNo; // Return the high-part.
429 printOperand(MI, OpNo);
433 bool PPCAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
435 const char *ExtraCode) {
436 if (ExtraCode && ExtraCode[0])
437 return true; // Unknown modifier.
438 printMemRegReg(MI, OpNo);
442 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
443 /// the current output stream.
445 void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
448 // Check for slwi/srwi mnemonics.
449 if (MI->getOpcode() == PPC::RLWINM) {
450 bool FoundMnemonic = false;
451 unsigned char SH = MI->getOperand(2).getImmedValue();
452 unsigned char MB = MI->getOperand(3).getImmedValue();
453 unsigned char ME = MI->getOperand(4).getImmedValue();
454 if (SH <= 31 && MB == 0 && ME == (31-SH)) {
455 O << "slwi "; FoundMnemonic = true;
457 if (SH <= 31 && MB == (32-SH) && ME == 31) {
458 O << "srwi "; FoundMnemonic = true;
465 O << ", " << (unsigned int)SH << "\n";
468 } else if (MI->getOpcode() == PPC::OR4 || MI->getOpcode() == PPC::OR8) {
469 if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
479 if (printInstruction(MI))
480 return; // Printer was automatically generated
482 assert(0 && "Unhandled instruction in asm writer!");
487 /// runOnMachineFunction - This uses the printMachineInstruction()
488 /// method to print assembly for each instruction.
490 bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
491 DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>());
492 // FIXME - should be able to debug coalesced functions.
493 bool IsNormalText = true;
495 SetupMachineFunction(MF);
498 // Print out constants referenced by the function
499 EmitConstantPool(MF.getConstantPool());
501 // Print out jump tables referenced by the function
502 EmitJumpTableInfo(MF.getJumpTableInfo());
504 // Print out labels for the function.
505 const Function *F = MF.getFunction();
506 switch (F->getLinkage()) {
507 default: assert(0 && "Unknown linkage type!");
508 case Function::InternalLinkage: // Symbols default to internal.
509 SwitchToTextSection("\t.text", F);
511 case Function::ExternalLinkage:
512 SwitchToTextSection("\t.text", F);
513 O << "\t.globl\t" << CurrentFnName << "\n";
515 case Function::WeakLinkage:
516 case Function::LinkOnceLinkage:
518 ".section __TEXT,__textcoal_nt,coalesced,pure_instructions", F);
519 O << "\t.globl\t" << CurrentFnName << "\n";
520 O << "\t.weak_definition\t" << CurrentFnName << "\n";
521 IsNormalText = false;
525 O << CurrentFnName << ":\n";
527 // Emit pre-function debug information.
528 DW.BeginFunction(&MF, IsNormalText);
530 // Print out code for the function.
531 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
533 // Print a label for the basic block.
534 if (I != MF.begin()) {
535 printBasicBlockLabel(I, true);
538 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
540 // Print the assembly for the instruction.
542 printMachineInstruction(II);
546 // Emit post-function debug information.
549 // We didn't modify anything.
554 bool DarwinAsmPrinter::doInitialization(Module &M) {
555 if (TM.getSubtarget<PPCSubtarget>().isGigaProcessor())
556 O << "\t.machine ppc970\n";
557 AsmPrinter::doInitialization(M);
559 // Darwin wants symbols to be quoted if they have complex names.
560 Mang->setUseQuotes(true);
562 // Emit initial debug information.
567 bool DarwinAsmPrinter::doFinalization(Module &M) {
568 const TargetData *TD = TM.getTargetData();
570 // Print out module-level global variables here.
571 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
573 if (!I->hasInitializer()) continue; // External global require no code
575 // Check to see if this is a special global used by LLVM, if so, emit it.
576 if (EmitSpecialLLVMGlobal(I))
579 std::string name = Mang->getValueName(I);
580 Constant *C = I->getInitializer();
581 unsigned Size = TD->getTypeSize(C->getType());
582 unsigned Align = getPreferredAlignmentLog(I);
584 if (C->isNullValue() && /* FIXME: Verify correct */
585 (I->hasInternalLinkage() || I->hasWeakLinkage() ||
586 I->hasLinkOnceLinkage() ||
587 (I->hasExternalLinkage() && !I->hasSection()))) {
588 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
589 if (I->hasExternalLinkage()) {
590 O << "\t.globl " << name << '\n';
591 O << "\t.zerofill __DATA, __common, " << name << ", "
592 << Size << ", " << Align;
593 } else if (I->hasInternalLinkage()) {
594 SwitchToDataSection("\t.data", I);
595 O << LCOMMDirective << name << "," << Size << "," << Align;
597 SwitchToDataSection("\t.data", I);
598 O << ".comm " << name << "," << Size;
600 O << "\t\t; '" << I->getName() << "'\n";
602 switch (I->getLinkage()) {
603 case GlobalValue::LinkOnceLinkage:
604 case GlobalValue::WeakLinkage:
605 O << "\t.globl " << name << '\n'
606 << "\t.weak_definition " << name << '\n';
607 SwitchToDataSection(".section __DATA,__datacoal_nt,coalesced", I);
609 case GlobalValue::AppendingLinkage:
610 // FIXME: appending linkage variables should go into a section of
611 // their name or something. For now, just emit them as external.
612 case GlobalValue::ExternalLinkage:
613 // If external or appending, declare as a global symbol
614 O << "\t.globl " << name << "\n";
616 case GlobalValue::InternalLinkage:
617 SwitchToDataSection("\t.data", I);
620 std::cerr << "Unknown linkage type!";
624 EmitAlignment(Align, I);
625 O << name << ":\t\t\t\t; '" << I->getName() << "'\n";
626 EmitGlobalConstant(C);
631 // Output stubs for dynamically-linked functions
632 if (TM.getRelocationModel() == Reloc::PIC) {
633 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
635 SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs,"
636 "pure_instructions,32", 0);
638 O << "L" << *i << "$stub:\n";
639 O << "\t.indirect_symbol " << *i << "\n";
641 O << "\tbcl 20,31,L0$" << *i << "\n";
642 O << "L0$" << *i << ":\n";
644 O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n";
646 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
647 O << "\tmtctr r12\n";
649 SwitchToDataSection(".lazy_symbol_pointer", 0);
650 O << "L" << *i << "$lazy_ptr:\n";
651 O << "\t.indirect_symbol " << *i << "\n";
652 O << "\t.long dyld_stub_binding_helper\n";
655 for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
657 SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs,"
658 "pure_instructions,16", 0);
660 O << "L" << *i << "$stub:\n";
661 O << "\t.indirect_symbol " << *i << "\n";
662 O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n";
663 O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
664 O << "\tmtctr r12\n";
666 SwitchToDataSection(".lazy_symbol_pointer", 0);
667 O << "L" << *i << "$lazy_ptr:\n";
668 O << "\t.indirect_symbol " << *i << "\n";
669 O << "\t.long dyld_stub_binding_helper\n";
675 // Output stubs for external and common global variables.
676 if (GVStubs.begin() != GVStubs.end()) {
677 SwitchToDataSection(".non_lazy_symbol_pointer", 0);
678 for (std::set<std::string>::iterator I = GVStubs.begin(),
679 E = GVStubs.end(); I != E; ++I) {
680 O << "L" << *I << "$non_lazy_ptr:\n";
681 O << "\t.indirect_symbol " << *I << "\n";
686 // Emit initial debug information.
689 // Funny Darwin hack: This flag tells the linker that no global symbols
690 // contain code that falls through to other global symbols (e.g. the obvious
691 // implementation of multiple entry points). If this doesn't occur, the
692 // linker can safely perform dead code stripping. Since LLVM never generates
693 // code that does this, it is always safe to set.
694 O << "\t.subsections_via_symbols\n";
696 AsmPrinter::doFinalization(M);
697 return false; // success
700 /// runOnMachineFunction - This uses the printMachineInstruction()
701 /// method to print assembly for each instruction.
703 bool AIXAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
704 SetupMachineFunction(MF);
706 // Print out constants referenced by the function
707 EmitConstantPool(MF.getConstantPool());
709 // Print out header for the function.
710 O << "\t.csect .text[PR]\n"
712 << "\t.globl " << CurrentFnName << '\n'
713 << "\t.globl ." << CurrentFnName << '\n'
714 << "\t.csect " << CurrentFnName << "[DS],3\n"
715 << CurrentFnName << ":\n"
716 << "\t.llong ." << CurrentFnName << ", TOC[tc0], 0\n"
717 << "\t.csect .text[PR]\n"
718 << '.' << CurrentFnName << ":\n";
720 // Print out code for the function.
721 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
723 printBasicBlockLabel(I);
725 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
727 // Print the assembly for the instruction.
729 printMachineInstruction(II);
733 O << "LT.." << CurrentFnName << ":\n"
735 << "\t.byte 0,0,32,65,128,0,0,0\n"
736 << "\t.long LT.." << CurrentFnName << "-." << CurrentFnName << '\n'
738 << "\t.byte \"" << CurrentFnName << "\"\n"
741 // We didn't modify anything.
745 bool AIXAsmPrinter::doInitialization(Module &M) {
746 SwitchToDataSection("", 0);
748 O << "\t.machine \"ppc64\"\n"
750 << "\t.csect .text[PR]\n";
752 // Print out module-level global variables
753 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
755 if (!I->hasInitializer())
758 std::string Name = I->getName();
759 Constant *C = I->getInitializer();
760 // N.B.: We are defaulting to writable strings
761 if (I->hasExternalLinkage()) {
762 O << "\t.globl " << Name << '\n'
763 << "\t.csect .data[RW],3\n";
765 O << "\t.csect _global.rw_c[RW],3\n";
768 EmitGlobalConstant(C);
771 // Output labels for globals
772 if (M.global_begin() != M.global_end()) O << "\t.toc\n";
773 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
775 const GlobalVariable *GV = I;
776 // Do not output labels for unused variables
777 if (GV->isExternal() && GV->use_begin() == GV->use_end())
780 IncrementFunctionNumber();
781 std::string Name = GV->getName();
782 std::string Label = "LC.." + utostr(getFunctionNumber());
783 GVToLabelMap[GV] = Label;
785 << "\t.tc " << Name << "[TC]," << Name;
786 if (GV->isExternal()) O << "[RW]";
790 AsmPrinter::doInitialization(M);
791 return false; // success
794 bool AIXAsmPrinter::doFinalization(Module &M) {
795 const TargetData *TD = TM.getTargetData();
796 // Print out module-level global variables
797 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
799 if (I->hasInitializer() || I->hasExternalLinkage())
802 std::string Name = I->getName();
803 if (I->hasInternalLinkage()) {
804 O << "\t.lcomm " << Name << ",16,_global.bss_c";
806 O << "\t.comm " << Name << "," << TD->getTypeSize(I->getType())
807 << "," << Log2_32((unsigned)TD->getTypeAlignment(I->getType()));
809 O << "\t\t" << CommentString << " ";
810 WriteAsOperand(O, I, false, true, &M);
814 O << "_section_.text:\n"
815 << "\t.csect .data[RW],3\n"
816 << "\t.llong _section_.text\n";
817 AsmPrinter::doFinalization(M);
818 return false; // success