1 //===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
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 implements the AsmPrinter class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/AsmPrinter.h"
15 #include "llvm/Assembly/Writer.h"
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/Constants.h"
18 #include "llvm/Module.h"
19 #include "llvm/CodeGen/GCMetadataPrinter.h"
20 #include "llvm/CodeGen/MachineConstantPool.h"
21 #include "llvm/CodeGen/MachineJumpTableInfo.h"
22 #include "llvm/CodeGen/MachineModuleInfo.h"
23 #include "llvm/CodeGen/DwarfWriter.h"
24 #include "llvm/Analysis/DebugInfo.h"
25 #include "llvm/MC/MCInst.h"
26 #include "llvm/Support/CommandLine.h"
27 #include "llvm/Support/ErrorHandling.h"
28 #include "llvm/Support/FormattedStream.h"
29 #include "llvm/Support/Mangler.h"
30 #include "llvm/Support/FormattedStream.h"
31 #include "llvm/Target/TargetAsmInfo.h"
32 #include "llvm/Target/TargetData.h"
33 #include "llvm/Target/TargetLowering.h"
34 #include "llvm/Target/TargetOptions.h"
35 #include "llvm/Target/TargetRegisterInfo.h"
36 #include "llvm/ADT/SmallPtrSet.h"
37 #include "llvm/ADT/SmallString.h"
38 #include "llvm/ADT/StringExtras.h"
42 static cl::opt<cl::boolOrDefault>
43 AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
44 cl::init(cl::BOU_UNSET));
46 char AsmPrinter::ID = 0;
47 AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
48 const TargetAsmInfo *T, bool VDef)
49 : MachineFunctionPass(&ID), FunctionNumber(0), O(o),
50 TM(tm), TAI(T), TRI(tm.getRegisterInfo()),
51 IsInTextSection(false), LastMI(0), LastFn(0), Counter(~0U),
52 PrevDLT(0, ~0U, ~0U) {
55 case cl::BOU_UNSET: VerboseAsm = VDef; break;
56 case cl::BOU_TRUE: VerboseAsm = true; break;
57 case cl::BOU_FALSE: VerboseAsm = false; break;
61 AsmPrinter::~AsmPrinter() {
62 for (gcp_iterator I = GCMetadataPrinters.begin(),
63 E = GCMetadataPrinters.end(); I != E; ++I)
67 /// SwitchToTextSection - Switch to the specified text section of the executable
68 /// if we are not already in it!
70 void AsmPrinter::SwitchToTextSection(const char *NewSection,
71 const GlobalValue *GV) {
73 if (GV && GV->hasSection())
74 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
78 // If we're already in this section, we're done.
79 if (CurrentSection == NS) return;
81 // Close the current section, if applicable.
82 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
83 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
87 if (!CurrentSection.empty())
88 O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
90 IsInTextSection = true;
93 /// SwitchToDataSection - Switch to the specified data section of the executable
94 /// if we are not already in it!
96 void AsmPrinter::SwitchToDataSection(const char *NewSection,
97 const GlobalValue *GV) {
99 if (GV && GV->hasSection())
100 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
104 // If we're already in this section, we're done.
105 if (CurrentSection == NS) return;
107 // Close the current section, if applicable.
108 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
109 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
113 if (!CurrentSection.empty())
114 O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
116 IsInTextSection = false;
119 /// SwitchToSection - Switch to the specified section of the executable if we
120 /// are not already in it!
121 void AsmPrinter::SwitchToSection(const Section* NS) {
122 const std::string& NewSection = NS->getName();
124 // If we're already in this section, we're done.
125 if (CurrentSection == NewSection) return;
127 // Close the current section, if applicable.
128 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
129 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
131 // FIXME: Make CurrentSection a Section* in the future
132 CurrentSection = NewSection;
133 CurrentSection_ = NS;
135 if (!CurrentSection.empty()) {
136 // If section is named we need to switch into it via special '.section'
137 // directive and also append funky flags. Otherwise - section name is just
138 // some magic assembler directive.
140 O << TAI->getSwitchToSectionDirective()
142 << TAI->getSectionFlags(NS->getFlags());
145 O << TAI->getDataSectionStartSuffix() << '\n';
148 IsInTextSection = (NS->getFlags() & SectionFlags::Code);
151 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
152 MachineFunctionPass::getAnalysisUsage(AU);
153 AU.addRequired<GCModuleInfo>();
156 bool AsmPrinter::doInitialization(Module &M) {
157 Mang = new Mangler(M, TAI->getGlobalPrefix(), TAI->getPrivateGlobalPrefix());
159 if (TAI->doesAllowQuotesInName())
160 Mang->setUseQuotes(true);
162 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
163 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
165 if (TAI->hasSingleParameterDotFile()) {
166 /* Very minimal debug info. It is ignored if we emit actual
167 debug info. If we don't, this at helps the user find where
168 a function came from. */
169 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
172 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
173 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
174 MP->beginAssembly(O, *this, *TAI);
176 if (!M.getModuleInlineAsm().empty())
177 O << TAI->getCommentString() << " Start of file scope inline assembly\n"
178 << M.getModuleInlineAsm()
179 << '\n' << TAI->getCommentString()
180 << " End of file scope inline assembly\n";
182 SwitchToDataSection(""); // Reset back to no section.
184 if (TAI->doesSupportDebugInformation() ||
185 TAI->doesSupportExceptionHandling()) {
186 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
188 MMI->AnalyzeModule(M);
189 DW = getAnalysisIfAvailable<DwarfWriter>();
191 DW->BeginModule(&M, MMI, O, this, TAI);
197 bool AsmPrinter::doFinalization(Module &M) {
198 // Emit final debug information.
199 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
202 // If the target wants to know about weak references, print them all.
203 if (TAI->getWeakRefDirective()) {
204 // FIXME: This is not lazy, it would be nice to only print weak references
205 // to stuff that is actually used. Note that doing so would require targets
206 // to notice uses in operands (due to constant exprs etc). This should
207 // happen with the MC stuff eventually.
208 SwitchToDataSection("");
210 // Print out module-level global variables here.
211 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
213 if (I->hasExternalWeakLinkage())
214 O << TAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
217 for (Module::const_iterator I = M.begin(), E = M.end();
219 if (I->hasExternalWeakLinkage())
220 O << TAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
224 if (TAI->getSetDirective()) {
225 if (!M.alias_empty())
226 SwitchToSection(TAI->getTextSection());
229 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
231 std::string Name = Mang->getMangledName(I);
233 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
234 std::string Target = Mang->getMangledName(GV);
236 if (I->hasExternalLinkage() || !TAI->getWeakRefDirective())
237 O << "\t.globl\t" << Name << '\n';
238 else if (I->hasWeakLinkage())
239 O << TAI->getWeakRefDirective() << Name << '\n';
240 else if (!I->hasLocalLinkage())
241 llvm_unreachable("Invalid alias linkage");
243 printVisibility(Name, I->getVisibility());
245 O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n';
249 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
250 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
251 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
252 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
253 MP->finishAssembly(O, *this, *TAI);
255 // If we don't have any trampolines, then we don't require stack memory
256 // to be executable. Some targets have a directive to declare this.
257 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
258 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
259 if (TAI->getNonexecutableStackDirective())
260 O << TAI->getNonexecutableStackDirective() << '\n';
262 delete Mang; Mang = 0;
268 AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF,
269 std::string &Name) const {
270 assert(MF && "No machine function?");
271 Name = MF->getFunction()->getName();
273 Name = Mang->getMangledName(MF->getFunction());
275 // FIXME: THIS SEEMS REALLY WRONG, it will get two prefixes.
276 Name = Mang->makeNameProper(TAI->getEHGlobalPrefix() + Name + ".eh");
280 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
281 // What's my mangled name?
282 CurrentFnName = Mang->getMangledName(MF.getFunction());
283 IncrementFunctionNumber();
287 // SectionCPs - Keep track the alignment, constpool entries per Section.
291 SmallVector<unsigned, 4> CPEs;
292 SectionCPs(const Section *s, unsigned a) : S(s), Alignment(a) {};
296 /// EmitConstantPool - Print to the current output stream assembly
297 /// representations of the constants in the constant pool MCP. This is
298 /// used to print out constants which have been "spilled to memory" by
299 /// the code generator.
301 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
302 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
303 if (CP.empty()) return;
305 // Calculate sections for constant pool entries. We collect entries to go into
306 // the same section together to reduce amount of section switch statements.
307 SmallVector<SectionCPs, 4> CPSections;
308 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
309 MachineConstantPoolEntry CPE = CP[i];
310 unsigned Align = CPE.getAlignment();
311 const Section* S = TAI->SelectSectionForMachineConst(CPE.getType());
312 // The number of sections are small, just do a linear search from the
313 // last section to the first.
315 unsigned SecIdx = CPSections.size();
316 while (SecIdx != 0) {
317 if (CPSections[--SecIdx].S == S) {
323 SecIdx = CPSections.size();
324 CPSections.push_back(SectionCPs(S, Align));
327 if (Align > CPSections[SecIdx].Alignment)
328 CPSections[SecIdx].Alignment = Align;
329 CPSections[SecIdx].CPEs.push_back(i);
332 // Now print stuff into the calculated sections.
333 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
334 SwitchToSection(CPSections[i].S);
335 EmitAlignment(Log2_32(CPSections[i].Alignment));
338 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
339 unsigned CPI = CPSections[i].CPEs[j];
340 MachineConstantPoolEntry CPE = CP[CPI];
342 // Emit inter-object padding for alignment.
343 unsigned AlignMask = CPE.getAlignment() - 1;
344 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
345 EmitZeros(NewOffset - Offset);
347 const Type *Ty = CPE.getType();
348 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
350 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
351 << CPI << ":\t\t\t\t\t";
353 O << TAI->getCommentString() << ' ';
354 WriteTypeSymbolic(O, CPE.getType(), 0);
357 if (CPE.isMachineConstantPoolEntry())
358 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
360 EmitGlobalConstant(CPE.Val.ConstVal);
365 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
366 /// by the current function to the current output stream.
368 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
369 MachineFunction &MF) {
370 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
371 if (JT.empty()) return;
373 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
375 // Pick the directive to use to print the jump table entries, and switch to
376 // the appropriate section.
377 TargetLowering *LoweringInfo = TM.getTargetLowering();
379 const char* JumpTableDataSection = TAI->getJumpTableDataSection();
380 const Function *F = MF.getFunction();
381 unsigned SectionFlags = TAI->SectionFlagsForGlobal(F);
382 bool JTInDiffSection = false;
383 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
384 !JumpTableDataSection ||
385 SectionFlags & SectionFlags::Linkonce) {
386 // In PIC mode, we need to emit the jump table to the same section as the
387 // function body itself, otherwise the label differences won't make sense.
388 // We should also do if the section name is NULL or function is declared in
389 // discardable section.
390 SwitchToSection(TAI->SectionForGlobal(F));
392 SwitchToDataSection(JumpTableDataSection);
393 JTInDiffSection = true;
396 EmitAlignment(Log2_32(MJTI->getAlignment()));
398 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
399 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
401 // If this jump table was deleted, ignore it.
402 if (JTBBs.empty()) continue;
404 // For PIC codegen, if possible we want to use the SetDirective to reduce
405 // the number of relocations the assembler will generate for the jump table.
406 // Set directives are all printed before the jump table itself.
407 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
408 if (TAI->getSetDirective() && IsPic)
409 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
410 if (EmittedSets.insert(JTBBs[ii]))
411 printPICJumpTableSetLabel(i, JTBBs[ii]);
413 // On some targets (e.g. darwin) we want to emit two consequtive labels
414 // before each jump table. The first label is never referenced, but tells
415 // the assembler and linker the extents of the jump table object. The
416 // second label is actually referenced by the code.
417 if (JTInDiffSection) {
418 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
419 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
422 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
423 << '_' << i << ":\n";
425 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
426 printPICJumpTableEntry(MJTI, JTBBs[ii], i);
432 void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
433 const MachineBasicBlock *MBB,
434 unsigned uid) const {
435 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
437 // Use JumpTableDirective otherwise honor the entry size from the jump table
439 const char *JTEntryDirective = TAI->getJumpTableDirective();
440 bool HadJTEntryDirective = JTEntryDirective != NULL;
441 if (!HadJTEntryDirective) {
442 JTEntryDirective = MJTI->getEntrySize() == 4 ?
443 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
446 O << JTEntryDirective << ' ';
448 // If we have emitted set directives for the jump table entries, print
449 // them rather than the entries themselves. If we're emitting PIC, then
450 // emit the table entries as differences between two text section labels.
451 // If we're emitting non-PIC code, then emit the entries as direct
452 // references to the target basic blocks.
454 if (TAI->getSetDirective()) {
455 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
456 << '_' << uid << "_set_" << MBB->getNumber();
458 printBasicBlockLabel(MBB, false, false, false);
459 // If the arch uses custom Jump Table directives, don't calc relative to
461 if (!HadJTEntryDirective)
462 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
463 << getFunctionNumber() << '_' << uid;
466 printBasicBlockLabel(MBB, false, false, false);
471 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
472 /// special global used by LLVM. If so, emit it and return true, otherwise
473 /// do nothing and return false.
474 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
475 if (GV->getName() == "llvm.used") {
476 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
477 EmitLLVMUsedList(GV->getInitializer());
481 // Ignore debug and non-emitted data.
482 if (GV->getSection() == "llvm.metadata" ||
483 GV->hasAvailableExternallyLinkage())
486 if (!GV->hasAppendingLinkage()) return false;
488 assert(GV->hasInitializer() && "Not a special LLVM global!");
490 const TargetData *TD = TM.getTargetData();
491 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
492 if (GV->getName() == "llvm.global_ctors") {
493 SwitchToDataSection(TAI->getStaticCtorsSection());
494 EmitAlignment(Align, 0);
495 EmitXXStructorList(GV->getInitializer());
499 if (GV->getName() == "llvm.global_dtors") {
500 SwitchToDataSection(TAI->getStaticDtorsSection());
501 EmitAlignment(Align, 0);
502 EmitXXStructorList(GV->getInitializer());
509 /// findGlobalValue - if CV is an expression equivalent to a single
510 /// global value, return that value.
511 const GlobalValue * AsmPrinter::findGlobalValue(const Constant *CV) {
512 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
514 else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
515 const TargetData *TD = TM.getTargetData();
516 unsigned Opcode = CE->getOpcode();
518 case Instruction::GetElementPtr: {
519 const Constant *ptrVal = CE->getOperand(0);
520 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
521 if (TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], idxVec.size()))
523 return findGlobalValue(ptrVal);
525 case Instruction::BitCast:
526 return findGlobalValue(CE->getOperand(0));
534 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
535 /// global in the specified llvm.used list for which emitUsedDirectiveFor
536 /// is true, as being used with this directive.
538 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
539 const char *Directive = TAI->getUsedDirective();
541 // Should be an array of 'i8*'.
542 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
543 if (InitList == 0) return;
545 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
546 const GlobalValue *GV = findGlobalValue(InitList->getOperand(i));
547 if (TAI->emitUsedDirectiveFor(GV, Mang)) {
549 EmitConstantValueOnly(InitList->getOperand(i));
555 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
556 /// function pointers, ignoring the init priority.
557 void AsmPrinter::EmitXXStructorList(Constant *List) {
558 // Should be an array of '{ int, void ()* }' structs. The first value is the
559 // init priority, which we ignore.
560 if (!isa<ConstantArray>(List)) return;
561 ConstantArray *InitList = cast<ConstantArray>(List);
562 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
563 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
564 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
566 if (CS->getOperand(1)->isNullValue())
567 return; // Found a null terminator, exit printing.
568 // Emit the function pointer.
569 EmitGlobalConstant(CS->getOperand(1));
573 /// getGlobalLinkName - Returns the asm/link name of of the specified
574 /// global variable. Should be overridden by each target asm printer to
575 /// generate the appropriate value.
576 const std::string &AsmPrinter::getGlobalLinkName(const GlobalVariable *GV,
577 std::string &LinkName) const {
578 if (isa<Function>(GV)) {
579 LinkName += TAI->getFunctionAddrPrefix();
580 LinkName += Mang->getMangledName(GV);
581 LinkName += TAI->getFunctionAddrSuffix();
583 LinkName += TAI->getGlobalVarAddrPrefix();
584 LinkName += Mang->getMangledName(GV);
585 LinkName += TAI->getGlobalVarAddrSuffix();
591 /// EmitExternalGlobal - Emit the external reference to a global variable.
592 /// Should be overridden if an indirect reference should be used.
593 void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
595 O << getGlobalLinkName(GV, GLN);
600 //===----------------------------------------------------------------------===//
601 /// LEB 128 number encoding.
603 /// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
604 /// representing an unsigned leb128 value.
605 void AsmPrinter::PrintULEB128(unsigned Value) const {
608 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
610 if (Value) Byte |= 0x80;
611 O << "0x" << utohex_buffer(Byte, Buffer+20);
612 if (Value) O << ", ";
616 /// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
617 /// representing a signed leb128 value.
618 void AsmPrinter::PrintSLEB128(int Value) const {
619 int Sign = Value >> (8 * sizeof(Value) - 1);
624 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
626 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
627 if (IsMore) Byte |= 0x80;
628 O << "0x" << utohex_buffer(Byte, Buffer+20);
629 if (IsMore) O << ", ";
633 //===--------------------------------------------------------------------===//
634 // Emission and print routines
637 /// PrintHex - Print a value as a hexidecimal value.
639 void AsmPrinter::PrintHex(int Value) const {
641 O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20);
644 /// EOL - Print a newline character to asm stream. If a comment is present
645 /// then it will be printed first. Comments should not contain '\n'.
646 void AsmPrinter::EOL() const {
650 void AsmPrinter::EOL(const std::string &Comment) const {
651 if (VerboseAsm && !Comment.empty()) {
653 << TAI->getCommentString()
660 void AsmPrinter::EOL(const char* Comment) const {
661 if (VerboseAsm && *Comment) {
663 << TAI->getCommentString()
670 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
671 /// unsigned leb128 value.
672 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
673 if (TAI->hasLEB128()) {
677 O << TAI->getData8bitsDirective();
682 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
683 /// signed leb128 value.
684 void AsmPrinter::EmitSLEB128Bytes(int Value) const {
685 if (TAI->hasLEB128()) {
689 O << TAI->getData8bitsDirective();
694 /// EmitInt8 - Emit a byte directive and value.
696 void AsmPrinter::EmitInt8(int Value) const {
697 O << TAI->getData8bitsDirective();
698 PrintHex(Value & 0xFF);
701 /// EmitInt16 - Emit a short directive and value.
703 void AsmPrinter::EmitInt16(int Value) const {
704 O << TAI->getData16bitsDirective();
705 PrintHex(Value & 0xFFFF);
708 /// EmitInt32 - Emit a long directive and value.
710 void AsmPrinter::EmitInt32(int Value) const {
711 O << TAI->getData32bitsDirective();
715 /// EmitInt64 - Emit a long long directive and value.
717 void AsmPrinter::EmitInt64(uint64_t Value) const {
718 if (TAI->getData64bitsDirective()) {
719 O << TAI->getData64bitsDirective();
722 if (TM.getTargetData()->isBigEndian()) {
723 EmitInt32(unsigned(Value >> 32)); O << '\n';
724 EmitInt32(unsigned(Value));
726 EmitInt32(unsigned(Value)); O << '\n';
727 EmitInt32(unsigned(Value >> 32));
732 /// toOctal - Convert the low order bits of X into an octal digit.
734 static inline char toOctal(int X) {
738 /// printStringChar - Print a char, escaped if necessary.
740 static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
743 } else if (C == '\\') {
745 } else if (isprint((unsigned char)C)) {
749 case '\b': O << "\\b"; break;
750 case '\f': O << "\\f"; break;
751 case '\n': O << "\\n"; break;
752 case '\r': O << "\\r"; break;
753 case '\t': O << "\\t"; break;
756 O << toOctal(C >> 6);
757 O << toOctal(C >> 3);
758 O << toOctal(C >> 0);
764 /// EmitString - Emit a string with quotes and a null terminator.
765 /// Special characters are emitted properly.
766 /// \literal (Eg. '\t') \endliteral
767 void AsmPrinter::EmitString(const std::string &String) const {
768 EmitString(String.c_str(), String.size());
771 void AsmPrinter::EmitString(const char *String, unsigned Size) const {
772 const char* AscizDirective = TAI->getAscizDirective();
776 O << TAI->getAsciiDirective();
778 for (unsigned i = 0; i < Size; ++i)
779 printStringChar(O, String[i]);
787 /// EmitFile - Emit a .file directive.
788 void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
789 O << "\t.file\t" << Number << " \"";
790 for (unsigned i = 0, N = Name.size(); i < N; ++i)
791 printStringChar(O, Name[i]);
796 //===----------------------------------------------------------------------===//
798 // EmitAlignment - Emit an alignment directive to the specified power of
799 // two boundary. For example, if you pass in 3 here, you will get an 8
800 // byte alignment. If a global value is specified, and if that global has
801 // an explicit alignment requested, it will unconditionally override the
802 // alignment request. However, if ForcedAlignBits is specified, this value
803 // has final say: the ultimate alignment will be the max of ForcedAlignBits
804 // and the alignment computed with NumBits and the global.
808 // if (GV && GV->hasalignment) Align = GV->getalignment();
809 // Align = std::max(Align, ForcedAlignBits);
811 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
812 unsigned ForcedAlignBits,
813 bool UseFillExpr) const {
814 if (GV && GV->getAlignment())
815 NumBits = Log2_32(GV->getAlignment());
816 NumBits = std::max(NumBits, ForcedAlignBits);
818 if (NumBits == 0) return; // No need to emit alignment.
819 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
820 O << TAI->getAlignDirective() << NumBits;
822 unsigned FillValue = TAI->getTextAlignFillValue();
823 UseFillExpr &= IsInTextSection && FillValue;
832 /// EmitZeros - Emit a block of zeros.
834 void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
836 if (TAI->getZeroDirective()) {
837 O << TAI->getZeroDirective() << NumZeros;
838 if (TAI->getZeroDirectiveSuffix())
839 O << TAI->getZeroDirectiveSuffix();
842 for (; NumZeros; --NumZeros)
843 O << TAI->getData8bitsDirective(AddrSpace) << "0\n";
848 // Print out the specified constant, without a storage class. Only the
849 // constants valid in constant expressions can occur here.
850 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
851 if (CV->isNullValue() || isa<UndefValue>(CV))
853 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
854 O << CI->getZExtValue();
855 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
856 // This is a constant address for a global variable or function. Use the
857 // name of the variable or function as the address value, possibly
858 // decorating it with GlobalVarAddrPrefix/Suffix or
859 // FunctionAddrPrefix/Suffix (these all default to "" )
860 if (isa<Function>(GV)) {
861 O << TAI->getFunctionAddrPrefix()
862 << Mang->getMangledName(GV)
863 << TAI->getFunctionAddrSuffix();
865 O << TAI->getGlobalVarAddrPrefix()
866 << Mang->getMangledName(GV)
867 << TAI->getGlobalVarAddrSuffix();
869 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
870 const TargetData *TD = TM.getTargetData();
871 unsigned Opcode = CE->getOpcode();
873 case Instruction::GetElementPtr: {
874 // generate a symbolic expression for the byte address
875 const Constant *ptrVal = CE->getOperand(0);
876 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
877 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
879 // Truncate/sext the offset to the pointer size.
880 if (TD->getPointerSizeInBits() != 64) {
881 int SExtAmount = 64-TD->getPointerSizeInBits();
882 Offset = (Offset << SExtAmount) >> SExtAmount;
887 EmitConstantValueOnly(ptrVal);
889 O << ") + " << Offset;
891 O << ") - " << -Offset;
893 EmitConstantValueOnly(ptrVal);
897 case Instruction::Trunc:
898 case Instruction::ZExt:
899 case Instruction::SExt:
900 case Instruction::FPTrunc:
901 case Instruction::FPExt:
902 case Instruction::UIToFP:
903 case Instruction::SIToFP:
904 case Instruction::FPToUI:
905 case Instruction::FPToSI:
906 llvm_unreachable("FIXME: Don't yet support this kind of constant cast expr");
908 case Instruction::BitCast:
909 return EmitConstantValueOnly(CE->getOperand(0));
911 case Instruction::IntToPtr: {
912 // Handle casts to pointers by changing them into casts to the appropriate
913 // integer type. This promotes constant folding and simplifies this code.
914 Constant *Op = CE->getOperand(0);
915 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
916 return EmitConstantValueOnly(Op);
920 case Instruction::PtrToInt: {
921 // Support only foldable casts to/from pointers that can be eliminated by
922 // changing the pointer to the appropriately sized integer type.
923 Constant *Op = CE->getOperand(0);
924 const Type *Ty = CE->getType();
926 // We can emit the pointer value into this slot if the slot is an
927 // integer slot greater or equal to the size of the pointer.
928 if (TD->getTypeAllocSize(Ty) >= TD->getTypeAllocSize(Op->getType()))
929 return EmitConstantValueOnly(Op);
932 EmitConstantValueOnly(Op);
933 APInt ptrMask = APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Ty));
936 ptrMask.toStringUnsigned(S);
937 O << ") & " << S.c_str() << ')';
940 case Instruction::Add:
941 case Instruction::Sub:
942 case Instruction::And:
943 case Instruction::Or:
944 case Instruction::Xor:
946 EmitConstantValueOnly(CE->getOperand(0));
949 case Instruction::Add:
952 case Instruction::Sub:
955 case Instruction::And:
958 case Instruction::Or:
961 case Instruction::Xor:
968 EmitConstantValueOnly(CE->getOperand(1));
972 llvm_unreachable("Unsupported operator!");
975 llvm_unreachable("Unknown constant value!");
979 /// printAsCString - Print the specified array as a C compatible string, only if
980 /// the predicate isString is true.
982 static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
984 assert(CVA->isString() && "Array is not string compatible!");
987 for (unsigned i = 0; i != LastElt; ++i) {
989 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
990 printStringChar(O, C);
995 /// EmitString - Emit a zero-byte-terminated string constant.
997 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
998 unsigned NumElts = CVA->getNumOperands();
999 if (TAI->getAscizDirective() && NumElts &&
1000 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
1001 O << TAI->getAscizDirective();
1002 printAsCString(O, CVA, NumElts-1);
1004 O << TAI->getAsciiDirective();
1005 printAsCString(O, CVA, NumElts);
1010 void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
1011 unsigned AddrSpace) {
1012 if (CVA->isString()) {
1014 } else { // Not a string. Print the values in successive locations
1015 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
1016 EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
1020 void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
1021 const VectorType *PTy = CP->getType();
1023 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
1024 EmitGlobalConstant(CP->getOperand(I));
1027 void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
1028 unsigned AddrSpace) {
1029 // Print the fields in successive locations. Pad to align if needed!
1030 const TargetData *TD = TM.getTargetData();
1031 unsigned Size = TD->getTypeAllocSize(CVS->getType());
1032 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
1033 uint64_t sizeSoFar = 0;
1034 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
1035 const Constant* field = CVS->getOperand(i);
1037 // Check if padding is needed and insert one or more 0s.
1038 uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
1039 uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
1040 - cvsLayout->getElementOffset(i)) - fieldSize;
1041 sizeSoFar += fieldSize + padSize;
1043 // Now print the actual field value.
1044 EmitGlobalConstant(field, AddrSpace);
1046 // Insert padding - this may include padding to increase the size of the
1047 // current field up to the ABI size (if the struct is not packed) as well
1048 // as padding to ensure that the next field starts at the right offset.
1049 EmitZeros(padSize, AddrSpace);
1051 assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
1052 "Layout of constant struct may be incorrect!");
1055 void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1056 unsigned AddrSpace) {
1057 // FP Constants are printed as integer constants to avoid losing
1059 const TargetData *TD = TM.getTargetData();
1060 if (CFP->getType() == Type::DoubleTy) {
1061 double Val = CFP->getValueAPF().convertToDouble(); // for comment only
1062 uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1063 if (TAI->getData64bitsDirective(AddrSpace)) {
1064 O << TAI->getData64bitsDirective(AddrSpace) << i;
1066 O << '\t' << TAI->getCommentString() << " double value: " << Val;
1068 } else if (TD->isBigEndian()) {
1069 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1071 O << '\t' << TAI->getCommentString()
1072 << " double most significant word " << Val;
1074 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1076 O << '\t' << TAI->getCommentString()
1077 << " double least significant word " << Val;
1080 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1082 O << '\t' << TAI->getCommentString()
1083 << " double least significant word " << Val;
1085 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1087 O << '\t' << TAI->getCommentString()
1088 << " double most significant word " << Val;
1092 } else if (CFP->getType() == Type::FloatTy) {
1093 float Val = CFP->getValueAPF().convertToFloat(); // for comment only
1094 O << TAI->getData32bitsDirective(AddrSpace)
1095 << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1097 O << '\t' << TAI->getCommentString() << " float " << Val;
1100 } else if (CFP->getType() == Type::X86_FP80Ty) {
1101 // all long double variants are printed as hex
1102 // api needed to prevent premature destruction
1103 APInt api = CFP->getValueAPF().bitcastToAPInt();
1104 const uint64_t *p = api.getRawData();
1105 // Convert to double so we can print the approximate val as a comment.
1106 APFloat DoubleVal = CFP->getValueAPF();
1108 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1110 if (TD->isBigEndian()) {
1111 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1113 O << '\t' << TAI->getCommentString()
1114 << " long double most significant halfword of ~"
1115 << DoubleVal.convertToDouble();
1117 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1119 O << '\t' << TAI->getCommentString() << " long double next halfword";
1121 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1123 O << '\t' << TAI->getCommentString() << " long double next halfword";
1125 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1127 O << '\t' << TAI->getCommentString() << " long double next halfword";
1129 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1131 O << '\t' << TAI->getCommentString()
1132 << " long double least significant halfword";
1135 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1137 O << '\t' << TAI->getCommentString()
1138 << " long double least significant halfword of ~"
1139 << DoubleVal.convertToDouble();
1141 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1143 O << '\t' << TAI->getCommentString()
1144 << " long double next halfword";
1146 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1148 O << '\t' << TAI->getCommentString()
1149 << " long double next halfword";
1151 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1153 O << '\t' << TAI->getCommentString()
1154 << " long double next halfword";
1156 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1158 O << '\t' << TAI->getCommentString()
1159 << " long double most significant halfword";
1162 EmitZeros(TD->getTypeAllocSize(Type::X86_FP80Ty) -
1163 TD->getTypeStoreSize(Type::X86_FP80Ty), AddrSpace);
1165 } else if (CFP->getType() == Type::PPC_FP128Ty) {
1166 // all long double variants are printed as hex
1167 // api needed to prevent premature destruction
1168 APInt api = CFP->getValueAPF().bitcastToAPInt();
1169 const uint64_t *p = api.getRawData();
1170 if (TD->isBigEndian()) {
1171 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1173 O << '\t' << TAI->getCommentString()
1174 << " long double most significant word";
1176 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1178 O << '\t' << TAI->getCommentString()
1179 << " long double next word";
1181 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1183 O << '\t' << TAI->getCommentString()
1184 << " long double next word";
1186 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1188 O << '\t' << TAI->getCommentString()
1189 << " long double least significant word";
1192 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1194 O << '\t' << TAI->getCommentString()
1195 << " long double least significant word";
1197 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1199 O << '\t' << TAI->getCommentString()
1200 << " long double next word";
1202 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1204 O << '\t' << TAI->getCommentString()
1205 << " long double next word";
1207 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1209 O << '\t' << TAI->getCommentString()
1210 << " long double most significant word";
1214 } else llvm_unreachable("Floating point constant type not handled");
1217 void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1218 unsigned AddrSpace) {
1219 const TargetData *TD = TM.getTargetData();
1220 unsigned BitWidth = CI->getBitWidth();
1221 assert(isPowerOf2_32(BitWidth) &&
1222 "Non-power-of-2-sized integers not handled!");
1224 // We don't expect assemblers to support integer data directives
1225 // for more than 64 bits, so we emit the data in at most 64-bit
1226 // quantities at a time.
1227 const uint64_t *RawData = CI->getValue().getRawData();
1228 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1230 if (TD->isBigEndian())
1231 Val = RawData[e - i - 1];
1235 if (TAI->getData64bitsDirective(AddrSpace))
1236 O << TAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1237 else if (TD->isBigEndian()) {
1238 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1240 O << '\t' << TAI->getCommentString()
1241 << " Double-word most significant word " << Val;
1243 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1245 O << '\t' << TAI->getCommentString()
1246 << " Double-word least significant word " << Val;
1249 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1251 O << '\t' << TAI->getCommentString()
1252 << " Double-word least significant word " << Val;
1254 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1256 O << '\t' << TAI->getCommentString()
1257 << " Double-word most significant word " << Val;
1263 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1264 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1265 const TargetData *TD = TM.getTargetData();
1266 const Type *type = CV->getType();
1267 unsigned Size = TD->getTypeAllocSize(type);
1269 if (CV->isNullValue() || isa<UndefValue>(CV)) {
1270 EmitZeros(Size, AddrSpace);
1272 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1273 EmitGlobalConstantArray(CVA , AddrSpace);
1275 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1276 EmitGlobalConstantStruct(CVS, AddrSpace);
1278 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1279 EmitGlobalConstantFP(CFP, AddrSpace);
1281 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1282 // Small integers are handled below; large integers are handled here.
1284 EmitGlobalConstantLargeInt(CI, AddrSpace);
1287 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1288 EmitGlobalConstantVector(CP);
1292 printDataDirective(type, AddrSpace);
1293 EmitConstantValueOnly(CV);
1295 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1297 CI->getValue().toStringUnsigned(S, 16);
1298 O << "\t\t\t" << TAI->getCommentString() << " 0x" << S.c_str();
1304 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1305 // Target doesn't support this yet!
1306 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1309 /// PrintSpecial - Print information related to the specified machine instr
1310 /// that is independent of the operand, and may be independent of the instr
1311 /// itself. This can be useful for portably encoding the comment character
1312 /// or other bits of target-specific knowledge into the asmstrings. The
1313 /// syntax used is ${:comment}. Targets can override this to add support
1314 /// for their own strange codes.
1315 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1316 if (!strcmp(Code, "private")) {
1317 O << TAI->getPrivateGlobalPrefix();
1318 } else if (!strcmp(Code, "comment")) {
1320 O << TAI->getCommentString();
1321 } else if (!strcmp(Code, "uid")) {
1322 // Comparing the address of MI isn't sufficient, because machineinstrs may
1323 // be allocated to the same address across functions.
1324 const Function *ThisF = MI->getParent()->getParent()->getFunction();
1326 // If this is a new LastFn instruction, bump the counter.
1327 if (LastMI != MI || LastFn != ThisF) {
1335 raw_string_ostream Msg(msg);
1336 Msg << "Unknown special formatter '" << Code
1337 << "' for machine instr: " << *MI;
1338 llvm_report_error(Msg.str());
1342 /// processDebugLoc - Processes the debug information of each machine
1343 /// instruction's DebugLoc.
1344 void AsmPrinter::processDebugLoc(DebugLoc DL) {
1345 if (TAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) {
1346 if (!DL.isUnknown()) {
1347 DebugLocTuple CurDLT = MF->getDebugLocTuple(DL);
1349 if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT)
1350 printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,
1351 DICompileUnit(CurDLT.CompileUnit)));
1358 /// printInlineAsm - This method formats and prints the specified machine
1359 /// instruction that is an inline asm.
1360 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1361 unsigned NumOperands = MI->getNumOperands();
1363 // Count the number of register definitions.
1364 unsigned NumDefs = 0;
1365 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1367 assert(NumDefs != NumOperands-1 && "No asm string?");
1369 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1371 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1372 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1374 // If this asmstr is empty, just print the #APP/#NOAPP markers.
1375 // These are useful to see where empty asm's wound up.
1376 if (AsmStr[0] == 0) {
1377 O << TAI->getInlineAsmStart() << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1381 O << TAI->getInlineAsmStart() << "\n\t";
1383 // The variant of the current asmprinter.
1384 int AsmPrinterVariant = TAI->getAssemblerDialect();
1386 int CurVariant = -1; // The number of the {.|.|.} region we are in.
1387 const char *LastEmitted = AsmStr; // One past the last character emitted.
1389 while (*LastEmitted) {
1390 switch (*LastEmitted) {
1392 // Not a special case, emit the string section literally.
1393 const char *LiteralEnd = LastEmitted+1;
1394 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1395 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1397 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1398 O.write(LastEmitted, LiteralEnd-LastEmitted);
1399 LastEmitted = LiteralEnd;
1403 ++LastEmitted; // Consume newline character.
1404 O << '\n'; // Indent code with newline.
1407 ++LastEmitted; // Consume '$' character.
1411 switch (*LastEmitted) {
1412 default: Done = false; break;
1413 case '$': // $$ -> $
1414 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1416 ++LastEmitted; // Consume second '$' character.
1418 case '(': // $( -> same as GCC's { character.
1419 ++LastEmitted; // Consume '(' character.
1420 if (CurVariant != -1) {
1421 llvm_report_error("Nested variants found in inline asm string: '"
1422 + std::string(AsmStr) + "'");
1424 CurVariant = 0; // We're in the first variant now.
1427 ++LastEmitted; // consume '|' character.
1428 if (CurVariant == -1)
1429 O << '|'; // this is gcc's behavior for | outside a variant
1431 ++CurVariant; // We're in the next variant.
1433 case ')': // $) -> same as GCC's } char.
1434 ++LastEmitted; // consume ')' character.
1435 if (CurVariant == -1)
1436 O << '}'; // this is gcc's behavior for } outside a variant
1443 bool HasCurlyBraces = false;
1444 if (*LastEmitted == '{') { // ${variable}
1445 ++LastEmitted; // Consume '{' character.
1446 HasCurlyBraces = true;
1449 // If we have ${:foo}, then this is not a real operand reference, it is a
1450 // "magic" string reference, just like in .td files. Arrange to call
1452 if (HasCurlyBraces && *LastEmitted == ':') {
1454 const char *StrStart = LastEmitted;
1455 const char *StrEnd = strchr(StrStart, '}');
1457 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1458 + std::string(AsmStr) + "'");
1461 std::string Val(StrStart, StrEnd);
1462 PrintSpecial(MI, Val.c_str());
1463 LastEmitted = StrEnd+1;
1467 const char *IDStart = LastEmitted;
1470 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1471 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1472 llvm_report_error("Bad $ operand number in inline asm string: '"
1473 + std::string(AsmStr) + "'");
1475 LastEmitted = IDEnd;
1477 char Modifier[2] = { 0, 0 };
1479 if (HasCurlyBraces) {
1480 // If we have curly braces, check for a modifier character. This
1481 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1482 if (*LastEmitted == ':') {
1483 ++LastEmitted; // Consume ':' character.
1484 if (*LastEmitted == 0) {
1485 llvm_report_error("Bad ${:} expression in inline asm string: '"
1486 + std::string(AsmStr) + "'");
1489 Modifier[0] = *LastEmitted;
1490 ++LastEmitted; // Consume modifier character.
1493 if (*LastEmitted != '}') {
1494 llvm_report_error("Bad ${} expression in inline asm string: '"
1495 + std::string(AsmStr) + "'");
1497 ++LastEmitted; // Consume '}' character.
1500 if ((unsigned)Val >= NumOperands-1) {
1501 llvm_report_error("Invalid $ operand number in inline asm string: '"
1502 + std::string(AsmStr) + "'");
1505 // Okay, we finally have a value number. Ask the target to print this
1507 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1512 // Scan to find the machine operand number for the operand.
1513 for (; Val; --Val) {
1514 if (OpNo >= MI->getNumOperands()) break;
1515 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1516 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1519 if (OpNo >= MI->getNumOperands()) {
1522 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1523 ++OpNo; // Skip over the ID number.
1525 if (Modifier[0]=='l') // labels are target independent
1526 printBasicBlockLabel(MI->getOperand(OpNo).getMBB(),
1527 false, false, false);
1529 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1530 if ((OpFlags & 7) == 4) {
1531 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1532 Modifier[0] ? Modifier : 0);
1534 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1535 Modifier[0] ? Modifier : 0);
1541 raw_string_ostream Msg(msg);
1542 Msg << "Invalid operand found in inline asm: '"
1545 llvm_report_error(Msg.str());
1552 O << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1555 /// printImplicitDef - This method prints the specified machine instruction
1556 /// that is an implicit def.
1557 void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1559 O << '\t' << TAI->getCommentString() << " implicit-def: "
1560 << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n';
1563 /// printLabel - This method prints a local label used by debug and
1564 /// exception handling tables.
1565 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1566 printLabel(MI->getOperand(0).getImm());
1569 void AsmPrinter::printLabel(unsigned Id) const {
1570 O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n";
1573 /// printDeclare - This method prints a local variable declaration used by
1575 /// FIXME: It doesn't really print anything rather it inserts a DebugVariable
1576 /// entry into dwarf table.
1577 void AsmPrinter::printDeclare(const MachineInstr *MI) const {
1578 unsigned FI = MI->getOperand(0).getIndex();
1579 GlobalValue *GV = MI->getOperand(1).getGlobal();
1580 DW->RecordVariable(cast<GlobalVariable>(GV), FI, MI);
1583 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1584 /// instruction, using the specified assembler variant. Targets should
1585 /// overried this to format as appropriate.
1586 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1587 unsigned AsmVariant, const char *ExtraCode) {
1588 // Target doesn't support this yet!
1592 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1593 unsigned AsmVariant,
1594 const char *ExtraCode) {
1595 // Target doesn't support this yet!
1599 /// printBasicBlockLabel - This method prints the label for the specified
1600 /// MachineBasicBlock
1601 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1604 bool printComment) const {
1606 unsigned Align = MBB->getAlignment();
1608 EmitAlignment(Log2_32(Align));
1611 O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_'
1612 << MBB->getNumber();
1615 if (printComment && MBB->getBasicBlock())
1616 O << '\t' << TAI->getCommentString() << ' '
1617 << MBB->getBasicBlock()->getNameStart();
1620 /// printPICJumpTableSetLabel - This method prints a set label for the
1621 /// specified MachineBasicBlock for a jumptable entry.
1622 void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1623 const MachineBasicBlock *MBB) const {
1624 if (!TAI->getSetDirective())
1627 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1628 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1629 printBasicBlockLabel(MBB, false, false, false);
1630 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1631 << '_' << uid << '\n';
1634 void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1635 const MachineBasicBlock *MBB) const {
1636 if (!TAI->getSetDirective())
1639 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1640 << getFunctionNumber() << '_' << uid << '_' << uid2
1641 << "_set_" << MBB->getNumber() << ',';
1642 printBasicBlockLabel(MBB, false, false, false);
1643 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1644 << '_' << uid << '_' << uid2 << '\n';
1647 /// printDataDirective - This method prints the asm directive for the
1649 void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1650 const TargetData *TD = TM.getTargetData();
1651 switch (type->getTypeID()) {
1652 case Type::FloatTyID: case Type::DoubleTyID:
1653 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1654 assert(0 && "Should have already output floating point constant.");
1656 assert(0 && "Can't handle printing this type of thing");
1657 case Type::IntegerTyID: {
1658 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1660 O << TAI->getData8bitsDirective(AddrSpace);
1661 else if (BitWidth <= 16)
1662 O << TAI->getData16bitsDirective(AddrSpace);
1663 else if (BitWidth <= 32)
1664 O << TAI->getData32bitsDirective(AddrSpace);
1665 else if (BitWidth <= 64) {
1666 assert(TAI->getData64bitsDirective(AddrSpace) &&
1667 "Target cannot handle 64-bit constant exprs!");
1668 O << TAI->getData64bitsDirective(AddrSpace);
1670 llvm_unreachable("Target cannot handle given data directive width!");
1674 case Type::PointerTyID:
1675 if (TD->getPointerSize() == 8) {
1676 assert(TAI->getData64bitsDirective(AddrSpace) &&
1677 "Target cannot handle 64-bit pointer exprs!");
1678 O << TAI->getData64bitsDirective(AddrSpace);
1679 } else if (TD->getPointerSize() == 2) {
1680 O << TAI->getData16bitsDirective(AddrSpace);
1681 } else if (TD->getPointerSize() == 1) {
1682 O << TAI->getData8bitsDirective(AddrSpace);
1684 O << TAI->getData32bitsDirective(AddrSpace);
1690 void AsmPrinter::printVisibility(const std::string& Name,
1691 unsigned Visibility) const {
1692 if (Visibility == GlobalValue::HiddenVisibility) {
1693 if (const char *Directive = TAI->getHiddenDirective())
1694 O << Directive << Name << '\n';
1695 } else if (Visibility == GlobalValue::ProtectedVisibility) {
1696 if (const char *Directive = TAI->getProtectedDirective())
1697 O << Directive << Name << '\n';
1701 void AsmPrinter::printOffset(int64_t Offset) const {
1704 else if (Offset < 0)
1708 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1709 if (!S->usesMetadata())
1712 gcp_iterator GCPI = GCMetadataPrinters.find(S);
1713 if (GCPI != GCMetadataPrinters.end())
1714 return GCPI->second;
1716 const char *Name = S->getName().c_str();
1718 for (GCMetadataPrinterRegistry::iterator
1719 I = GCMetadataPrinterRegistry::begin(),
1720 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1721 if (strcmp(Name, I->getName()) == 0) {
1722 GCMetadataPrinter *GMP = I->instantiate();
1724 GCMetadataPrinters.insert(std::make_pair(S, GMP));
1728 cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1729 llvm_unreachable(0);
1732 /// EmitComments - Pretty-print comments for instructions
1733 void AsmPrinter::EmitComments(const MachineInstr &MI) const
1735 if (!MI.getDebugLoc().isUnknown()) {
1736 DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());
1738 // Print source line info
1739 O.PadToColumn(TAI->getCommentColumn(), 1);
1740 O << TAI->getCommentString() << " SrcLine " << DLT.Line << ":" << DLT.Col;
1744 /// EmitComments - Pretty-print comments for instructions
1745 void AsmPrinter::EmitComments(const MCInst &MI) const
1747 if (!MI.getDebugLoc().isUnknown()) {
1748 DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());
1750 // Print source line info
1751 O.PadToColumn(TAI->getCommentColumn(), 1);
1752 O << TAI->getCommentString() << " SrcLine " << DLT.Line << ":" << DLT.Col;