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/Target/TargetAsmInfo.h"
31 #include "llvm/Target/TargetData.h"
32 #include "llvm/Target/TargetLowering.h"
33 #include "llvm/Target/TargetOptions.h"
34 #include "llvm/Target/TargetRegisterInfo.h"
35 #include "llvm/ADT/SmallPtrSet.h"
36 #include "llvm/ADT/SmallString.h"
37 #include "llvm/ADT/StringExtras.h"
41 static cl::opt<cl::boolOrDefault>
42 AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
43 cl::init(cl::BOU_UNSET));
45 char AsmPrinter::ID = 0;
46 AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
47 const TargetAsmInfo *T, bool VDef)
48 : MachineFunctionPass(&ID), FunctionNumber(0), O(o),
49 TM(tm), TAI(T), TRI(tm.getRegisterInfo()),
50 IsInTextSection(false), LastMI(0), LastFn(0), Counter(~0U),
51 PrevDLT(0, ~0U, ~0U) {
54 case cl::BOU_UNSET: VerboseAsm = VDef; break;
55 case cl::BOU_TRUE: VerboseAsm = true; break;
56 case cl::BOU_FALSE: VerboseAsm = false; break;
60 AsmPrinter::~AsmPrinter() {
61 for (gcp_iterator I = GCMetadataPrinters.begin(),
62 E = GCMetadataPrinters.end(); I != E; ++I)
66 /// SwitchToTextSection - Switch to the specified text section of the executable
67 /// if we are not already in it!
69 void AsmPrinter::SwitchToTextSection(const char *NewSection,
70 const GlobalValue *GV) {
72 if (GV && GV->hasSection())
73 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
77 // If we're already in this section, we're done.
78 if (CurrentSection == NS) return;
80 // Close the current section, if applicable.
81 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
82 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
86 if (!CurrentSection.empty())
87 O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
89 IsInTextSection = true;
92 /// SwitchToDataSection - Switch to the specified data section of the executable
93 /// if we are not already in it!
95 void AsmPrinter::SwitchToDataSection(const char *NewSection,
96 const GlobalValue *GV) {
98 if (GV && GV->hasSection())
99 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
103 // If we're already in this section, we're done.
104 if (CurrentSection == NS) return;
106 // Close the current section, if applicable.
107 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
108 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
112 if (!CurrentSection.empty())
113 O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
115 IsInTextSection = false;
118 /// SwitchToSection - Switch to the specified section of the executable if we
119 /// are not already in it!
120 void AsmPrinter::SwitchToSection(const Section* NS) {
121 const std::string& NewSection = NS->getName();
123 // If we're already in this section, we're done.
124 if (CurrentSection == NewSection) return;
126 // Close the current section, if applicable.
127 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
128 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
130 // FIXME: Make CurrentSection a Section* in the future
131 CurrentSection = NewSection;
132 CurrentSection_ = NS;
134 if (!CurrentSection.empty()) {
135 // If section is named we need to switch into it via special '.section'
136 // directive and also append funky flags. Otherwise - section name is just
137 // some magic assembler directive.
138 if (NS->hasFlag(SectionFlags::Named)) {
139 O << TAI->getSwitchToSectionDirective()
142 SmallString<32> FlagsStr;
143 TAI->getSectionFlags(NS->getFlags(), FlagsStr);
144 O << FlagsStr.c_str();
148 O << TAI->getDataSectionStartSuffix() << '\n';
151 IsInTextSection = (NS->getFlags() & SectionFlags::Code);
154 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
155 MachineFunctionPass::getAnalysisUsage(AU);
156 AU.addRequired<GCModuleInfo>();
159 bool AsmPrinter::doInitialization(Module &M) {
160 Mang = new Mangler(M, TAI->getGlobalPrefix(), TAI->getPrivateGlobalPrefix(),
161 TAI->getLinkerPrivateGlobalPrefix());
163 if (TAI->doesAllowQuotesInName())
164 Mang->setUseQuotes(true);
166 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
167 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
169 if (TAI->hasSingleParameterDotFile()) {
170 /* Very minimal debug info. It is ignored if we emit actual
171 debug info. If we don't, this at helps the user find where
172 a function came from. */
173 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
176 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
177 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
178 MP->beginAssembly(O, *this, *TAI);
180 if (!M.getModuleInlineAsm().empty())
181 O << TAI->getCommentString() << " Start of file scope inline assembly\n"
182 << M.getModuleInlineAsm()
183 << '\n' << TAI->getCommentString()
184 << " End of file scope inline assembly\n";
186 SwitchToDataSection(""); // Reset back to no section.
188 if (TAI->doesSupportDebugInformation() ||
189 TAI->doesSupportExceptionHandling()) {
190 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
192 MMI->AnalyzeModule(M);
193 DW = getAnalysisIfAvailable<DwarfWriter>();
195 DW->BeginModule(&M, MMI, O, this, TAI);
201 bool AsmPrinter::doFinalization(Module &M) {
202 // Emit global variables.
203 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
205 PrintGlobalVariable(I);
207 // Emit final debug information.
208 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
211 // If the target wants to know about weak references, print them all.
212 if (TAI->getWeakRefDirective()) {
213 // FIXME: This is not lazy, it would be nice to only print weak references
214 // to stuff that is actually used. Note that doing so would require targets
215 // to notice uses in operands (due to constant exprs etc). This should
216 // happen with the MC stuff eventually.
217 SwitchToDataSection("");
219 // Print out module-level global variables here.
220 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
222 if (I->hasExternalWeakLinkage())
223 O << TAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
226 for (Module::const_iterator I = M.begin(), E = M.end();
228 if (I->hasExternalWeakLinkage())
229 O << TAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
233 if (TAI->getSetDirective()) {
234 if (!M.alias_empty())
235 SwitchToSection(TAI->getTextSection());
238 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
240 std::string Name = Mang->getMangledName(I);
242 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
243 std::string Target = Mang->getMangledName(GV);
245 if (I->hasExternalLinkage() || !TAI->getWeakRefDirective())
246 O << "\t.globl\t" << Name << '\n';
247 else if (I->hasWeakLinkage())
248 O << TAI->getWeakRefDirective() << Name << '\n';
249 else if (!I->hasLocalLinkage())
250 llvm_unreachable("Invalid alias linkage");
252 printVisibility(Name, I->getVisibility());
254 O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n';
258 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
259 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
260 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
261 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
262 MP->finishAssembly(O, *this, *TAI);
264 // If we don't have any trampolines, then we don't require stack memory
265 // to be executable. Some targets have a directive to declare this.
266 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
267 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
268 if (TAI->getNonexecutableStackDirective())
269 O << TAI->getNonexecutableStackDirective() << '\n';
271 delete Mang; Mang = 0;
277 AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF) const {
278 assert(MF && "No machine function?");
279 return Mang->getMangledName(MF->getFunction(), ".eh",
280 TAI->is_EHSymbolPrivate());
283 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
284 // What's my mangled name?
285 CurrentFnName = Mang->getMangledName(MF.getFunction());
286 IncrementFunctionNumber();
290 // SectionCPs - Keep track the alignment, constpool entries per Section.
294 SmallVector<unsigned, 4> CPEs;
295 SectionCPs(const Section *s, unsigned a) : S(s), Alignment(a) {};
299 /// EmitConstantPool - Print to the current output stream assembly
300 /// representations of the constants in the constant pool MCP. This is
301 /// used to print out constants which have been "spilled to memory" by
302 /// the code generator.
304 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
305 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
306 if (CP.empty()) return;
308 // Calculate sections for constant pool entries. We collect entries to go into
309 // the same section together to reduce amount of section switch statements.
310 SmallVector<SectionCPs, 4> CPSections;
311 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
312 const MachineConstantPoolEntry &CPE = CP[i];
313 unsigned Align = CPE.getAlignment();
316 switch (CPE.getRelocationInfo()) {
317 default: llvm_unreachable("Unknown section kind");
318 case 2: Kind = SectionKind::get(SectionKind::ReadOnlyWithRel, false); break;
320 Kind = SectionKind::get(SectionKind::ReadOnlyWithRelLocal,false);
323 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
324 case 4: Kind = SectionKind::get(SectionKind::MergeableConst4,false); break;
325 case 8: Kind = SectionKind::get(SectionKind::MergeableConst8,false); break;
326 case 16: Kind = SectionKind::get(SectionKind::MergeableConst16,false);break;
327 default: Kind = SectionKind::get(SectionKind::MergeableConst,false); break;
331 const Section *S = TAI->getSectionForMergeableConstant(Kind);
333 // The number of sections are small, just do a linear search from the
334 // last section to the first.
336 unsigned SecIdx = CPSections.size();
337 while (SecIdx != 0) {
338 if (CPSections[--SecIdx].S == S) {
344 SecIdx = CPSections.size();
345 CPSections.push_back(SectionCPs(S, Align));
348 if (Align > CPSections[SecIdx].Alignment)
349 CPSections[SecIdx].Alignment = Align;
350 CPSections[SecIdx].CPEs.push_back(i);
353 // Now print stuff into the calculated sections.
354 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
355 SwitchToSection(CPSections[i].S);
356 EmitAlignment(Log2_32(CPSections[i].Alignment));
359 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
360 unsigned CPI = CPSections[i].CPEs[j];
361 MachineConstantPoolEntry CPE = CP[CPI];
363 // Emit inter-object padding for alignment.
364 unsigned AlignMask = CPE.getAlignment() - 1;
365 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
366 EmitZeros(NewOffset - Offset);
368 const Type *Ty = CPE.getType();
369 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
371 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
372 << CPI << ":\t\t\t\t\t";
374 O << TAI->getCommentString() << ' ';
375 WriteTypeSymbolic(O, CPE.getType(), 0);
378 if (CPE.isMachineConstantPoolEntry())
379 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
381 EmitGlobalConstant(CPE.Val.ConstVal);
386 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
387 /// by the current function to the current output stream.
389 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
390 MachineFunction &MF) {
391 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
392 if (JT.empty()) return;
394 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
396 // Pick the directive to use to print the jump table entries, and switch to
397 // the appropriate section.
398 TargetLowering *LoweringInfo = TM.getTargetLowering();
400 const char* JumpTableDataSection = TAI->getJumpTableDataSection();
401 const Function *F = MF.getFunction();
402 const Section *FuncSection = TAI->SectionForGlobal(F);
404 bool JTInDiffSection = false;
405 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
406 !JumpTableDataSection ||
407 FuncSection->hasFlag(SectionFlags::Linkonce)) {
408 // In PIC mode, we need to emit the jump table to the same section as the
409 // function body itself, otherwise the label differences won't make sense.
410 // We should also do if the section name is NULL or function is declared in
411 // discardable section.
412 SwitchToSection(FuncSection);
414 SwitchToDataSection(JumpTableDataSection);
415 JTInDiffSection = true;
418 EmitAlignment(Log2_32(MJTI->getAlignment()));
420 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
421 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
423 // If this jump table was deleted, ignore it.
424 if (JTBBs.empty()) continue;
426 // For PIC codegen, if possible we want to use the SetDirective to reduce
427 // the number of relocations the assembler will generate for the jump table.
428 // Set directives are all printed before the jump table itself.
429 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
430 if (TAI->getSetDirective() && IsPic)
431 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
432 if (EmittedSets.insert(JTBBs[ii]))
433 printPICJumpTableSetLabel(i, JTBBs[ii]);
435 // On some targets (e.g. darwin) we want to emit two consequtive labels
436 // before each jump table. The first label is never referenced, but tells
437 // the assembler and linker the extents of the jump table object. The
438 // second label is actually referenced by the code.
439 if (JTInDiffSection) {
440 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
441 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
444 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
445 << '_' << i << ":\n";
447 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
448 printPICJumpTableEntry(MJTI, JTBBs[ii], i);
454 void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
455 const MachineBasicBlock *MBB,
456 unsigned uid) const {
457 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
459 // Use JumpTableDirective otherwise honor the entry size from the jump table
461 const char *JTEntryDirective = TAI->getJumpTableDirective();
462 bool HadJTEntryDirective = JTEntryDirective != NULL;
463 if (!HadJTEntryDirective) {
464 JTEntryDirective = MJTI->getEntrySize() == 4 ?
465 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
468 O << JTEntryDirective << ' ';
470 // If we have emitted set directives for the jump table entries, print
471 // them rather than the entries themselves. If we're emitting PIC, then
472 // emit the table entries as differences between two text section labels.
473 // If we're emitting non-PIC code, then emit the entries as direct
474 // references to the target basic blocks.
476 if (TAI->getSetDirective()) {
477 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
478 << '_' << uid << "_set_" << MBB->getNumber();
480 printBasicBlockLabel(MBB, false, false, false);
481 // If the arch uses custom Jump Table directives, don't calc relative to
483 if (!HadJTEntryDirective)
484 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
485 << getFunctionNumber() << '_' << uid;
488 printBasicBlockLabel(MBB, false, false, false);
493 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
494 /// special global used by LLVM. If so, emit it and return true, otherwise
495 /// do nothing and return false.
496 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
497 if (GV->getName() == "llvm.used") {
498 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
499 EmitLLVMUsedList(GV->getInitializer());
503 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
504 if (GV->getSection() == "llvm.metadata" ||
505 GV->hasAvailableExternallyLinkage())
508 if (!GV->hasAppendingLinkage()) return false;
510 assert(GV->hasInitializer() && "Not a special LLVM global!");
512 const TargetData *TD = TM.getTargetData();
513 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
514 if (GV->getName() == "llvm.global_ctors") {
515 SwitchToDataSection(TAI->getStaticCtorsSection());
516 EmitAlignment(Align, 0);
517 EmitXXStructorList(GV->getInitializer());
521 if (GV->getName() == "llvm.global_dtors") {
522 SwitchToDataSection(TAI->getStaticDtorsSection());
523 EmitAlignment(Align, 0);
524 EmitXXStructorList(GV->getInitializer());
531 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
532 /// global in the specified llvm.used list for which emitUsedDirectiveFor
533 /// is true, as being used with this directive.
534 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
535 const char *Directive = TAI->getUsedDirective();
537 // Should be an array of 'i8*'.
538 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
539 if (InitList == 0) return;
541 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
542 const GlobalValue *GV =
543 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
544 if (GV && TAI->emitUsedDirectiveFor(GV, Mang)) {
546 EmitConstantValueOnly(InitList->getOperand(i));
552 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
553 /// function pointers, ignoring the init priority.
554 void AsmPrinter::EmitXXStructorList(Constant *List) {
555 // Should be an array of '{ int, void ()* }' structs. The first value is the
556 // init priority, which we ignore.
557 if (!isa<ConstantArray>(List)) return;
558 ConstantArray *InitList = cast<ConstantArray>(List);
559 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
560 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
561 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
563 if (CS->getOperand(1)->isNullValue())
564 return; // Found a null terminator, exit printing.
565 // Emit the function pointer.
566 EmitGlobalConstant(CS->getOperand(1));
570 /// getGlobalLinkName - Returns the asm/link name of of the specified
571 /// global variable. Should be overridden by each target asm printer to
572 /// generate the appropriate value.
573 const std::string &AsmPrinter::getGlobalLinkName(const GlobalVariable *GV,
574 std::string &LinkName) const {
575 if (isa<Function>(GV)) {
576 LinkName += TAI->getFunctionAddrPrefix();
577 LinkName += Mang->getMangledName(GV);
578 LinkName += TAI->getFunctionAddrSuffix();
580 LinkName += TAI->getGlobalVarAddrPrefix();
581 LinkName += Mang->getMangledName(GV);
582 LinkName += TAI->getGlobalVarAddrSuffix();
588 /// EmitExternalGlobal - Emit the external reference to a global variable.
589 /// Should be overridden if an indirect reference should be used.
590 void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
592 O << getGlobalLinkName(GV, GLN);
597 //===----------------------------------------------------------------------===//
598 /// LEB 128 number encoding.
600 /// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
601 /// representing an unsigned leb128 value.
602 void AsmPrinter::PrintULEB128(unsigned Value) const {
605 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
607 if (Value) Byte |= 0x80;
608 O << "0x" << utohex_buffer(Byte, Buffer+20);
609 if (Value) O << ", ";
613 /// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
614 /// representing a signed leb128 value.
615 void AsmPrinter::PrintSLEB128(int Value) const {
616 int Sign = Value >> (8 * sizeof(Value) - 1);
621 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
623 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
624 if (IsMore) Byte |= 0x80;
625 O << "0x" << utohex_buffer(Byte, Buffer+20);
626 if (IsMore) O << ", ";
630 //===--------------------------------------------------------------------===//
631 // Emission and print routines
634 /// PrintHex - Print a value as a hexidecimal value.
636 void AsmPrinter::PrintHex(int Value) const {
638 O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20);
641 /// EOL - Print a newline character to asm stream. If a comment is present
642 /// then it will be printed first. Comments should not contain '\n'.
643 void AsmPrinter::EOL() const {
647 void AsmPrinter::EOL(const std::string &Comment) const {
648 if (VerboseAsm && !Comment.empty()) {
650 << TAI->getCommentString()
657 void AsmPrinter::EOL(const char* Comment) const {
658 if (VerboseAsm && *Comment) {
660 << TAI->getCommentString()
667 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
668 /// unsigned leb128 value.
669 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
670 if (TAI->hasLEB128()) {
674 O << TAI->getData8bitsDirective();
679 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
680 /// signed leb128 value.
681 void AsmPrinter::EmitSLEB128Bytes(int Value) const {
682 if (TAI->hasLEB128()) {
686 O << TAI->getData8bitsDirective();
691 /// EmitInt8 - Emit a byte directive and value.
693 void AsmPrinter::EmitInt8(int Value) const {
694 O << TAI->getData8bitsDirective();
695 PrintHex(Value & 0xFF);
698 /// EmitInt16 - Emit a short directive and value.
700 void AsmPrinter::EmitInt16(int Value) const {
701 O << TAI->getData16bitsDirective();
702 PrintHex(Value & 0xFFFF);
705 /// EmitInt32 - Emit a long directive and value.
707 void AsmPrinter::EmitInt32(int Value) const {
708 O << TAI->getData32bitsDirective();
712 /// EmitInt64 - Emit a long long directive and value.
714 void AsmPrinter::EmitInt64(uint64_t Value) const {
715 if (TAI->getData64bitsDirective()) {
716 O << TAI->getData64bitsDirective();
719 if (TM.getTargetData()->isBigEndian()) {
720 EmitInt32(unsigned(Value >> 32)); O << '\n';
721 EmitInt32(unsigned(Value));
723 EmitInt32(unsigned(Value)); O << '\n';
724 EmitInt32(unsigned(Value >> 32));
729 /// toOctal - Convert the low order bits of X into an octal digit.
731 static inline char toOctal(int X) {
735 /// printStringChar - Print a char, escaped if necessary.
737 static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
740 } else if (C == '\\') {
742 } else if (isprint((unsigned char)C)) {
746 case '\b': O << "\\b"; break;
747 case '\f': O << "\\f"; break;
748 case '\n': O << "\\n"; break;
749 case '\r': O << "\\r"; break;
750 case '\t': O << "\\t"; break;
753 O << toOctal(C >> 6);
754 O << toOctal(C >> 3);
755 O << toOctal(C >> 0);
761 /// EmitString - Emit a string with quotes and a null terminator.
762 /// Special characters are emitted properly.
763 /// \literal (Eg. '\t') \endliteral
764 void AsmPrinter::EmitString(const std::string &String) const {
765 EmitString(String.c_str(), String.size());
768 void AsmPrinter::EmitString(const char *String, unsigned Size) const {
769 const char* AscizDirective = TAI->getAscizDirective();
773 O << TAI->getAsciiDirective();
775 for (unsigned i = 0; i < Size; ++i)
776 printStringChar(O, String[i]);
784 /// EmitFile - Emit a .file directive.
785 void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
786 O << "\t.file\t" << Number << " \"";
787 for (unsigned i = 0, N = Name.size(); i < N; ++i)
788 printStringChar(O, Name[i]);
793 //===----------------------------------------------------------------------===//
795 // EmitAlignment - Emit an alignment directive to the specified power of
796 // two boundary. For example, if you pass in 3 here, you will get an 8
797 // byte alignment. If a global value is specified, and if that global has
798 // an explicit alignment requested, it will unconditionally override the
799 // alignment request. However, if ForcedAlignBits is specified, this value
800 // has final say: the ultimate alignment will be the max of ForcedAlignBits
801 // and the alignment computed with NumBits and the global.
805 // if (GV && GV->hasalignment) Align = GV->getalignment();
806 // Align = std::max(Align, ForcedAlignBits);
808 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
809 unsigned ForcedAlignBits,
810 bool UseFillExpr) const {
811 if (GV && GV->getAlignment())
812 NumBits = Log2_32(GV->getAlignment());
813 NumBits = std::max(NumBits, ForcedAlignBits);
815 if (NumBits == 0) return; // No need to emit alignment.
816 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
817 O << TAI->getAlignDirective() << NumBits;
819 unsigned FillValue = TAI->getTextAlignFillValue();
820 UseFillExpr &= IsInTextSection && FillValue;
829 /// EmitZeros - Emit a block of zeros.
831 void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
833 if (TAI->getZeroDirective()) {
834 O << TAI->getZeroDirective() << NumZeros;
835 if (TAI->getZeroDirectiveSuffix())
836 O << TAI->getZeroDirectiveSuffix();
839 for (; NumZeros; --NumZeros)
840 O << TAI->getData8bitsDirective(AddrSpace) << "0\n";
845 // Print out the specified constant, without a storage class. Only the
846 // constants valid in constant expressions can occur here.
847 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
848 if (CV->isNullValue() || isa<UndefValue>(CV))
850 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
851 O << CI->getZExtValue();
852 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
853 // This is a constant address for a global variable or function. Use the
854 // name of the variable or function as the address value, possibly
855 // decorating it with GlobalVarAddrPrefix/Suffix or
856 // FunctionAddrPrefix/Suffix (these all default to "" )
857 if (isa<Function>(GV)) {
858 O << TAI->getFunctionAddrPrefix()
859 << Mang->getMangledName(GV)
860 << TAI->getFunctionAddrSuffix();
862 O << TAI->getGlobalVarAddrPrefix()
863 << Mang->getMangledName(GV)
864 << TAI->getGlobalVarAddrSuffix();
866 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
867 const TargetData *TD = TM.getTargetData();
868 unsigned Opcode = CE->getOpcode();
870 case Instruction::GetElementPtr: {
871 // generate a symbolic expression for the byte address
872 const Constant *ptrVal = CE->getOperand(0);
873 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
874 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
876 // Truncate/sext the offset to the pointer size.
877 if (TD->getPointerSizeInBits() != 64) {
878 int SExtAmount = 64-TD->getPointerSizeInBits();
879 Offset = (Offset << SExtAmount) >> SExtAmount;
884 EmitConstantValueOnly(ptrVal);
886 O << ") + " << Offset;
888 O << ") - " << -Offset;
890 EmitConstantValueOnly(ptrVal);
894 case Instruction::Trunc:
895 case Instruction::ZExt:
896 case Instruction::SExt:
897 case Instruction::FPTrunc:
898 case Instruction::FPExt:
899 case Instruction::UIToFP:
900 case Instruction::SIToFP:
901 case Instruction::FPToUI:
902 case Instruction::FPToSI:
903 llvm_unreachable("FIXME: Don't yet support this kind of constant cast expr");
905 case Instruction::BitCast:
906 return EmitConstantValueOnly(CE->getOperand(0));
908 case Instruction::IntToPtr: {
909 // Handle casts to pointers by changing them into casts to the appropriate
910 // integer type. This promotes constant folding and simplifies this code.
911 Constant *Op = CE->getOperand(0);
912 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
913 return EmitConstantValueOnly(Op);
917 case Instruction::PtrToInt: {
918 // Support only foldable casts to/from pointers that can be eliminated by
919 // changing the pointer to the appropriately sized integer type.
920 Constant *Op = CE->getOperand(0);
921 const Type *Ty = CE->getType();
923 // We can emit the pointer value into this slot if the slot is an
924 // integer slot greater or equal to the size of the pointer.
925 if (TD->getTypeAllocSize(Ty) >= TD->getTypeAllocSize(Op->getType()))
926 return EmitConstantValueOnly(Op);
929 EmitConstantValueOnly(Op);
930 APInt ptrMask = APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Ty));
933 ptrMask.toStringUnsigned(S);
934 O << ") & " << S.c_str() << ')';
937 case Instruction::Add:
938 case Instruction::Sub:
939 case Instruction::And:
940 case Instruction::Or:
941 case Instruction::Xor:
943 EmitConstantValueOnly(CE->getOperand(0));
946 case Instruction::Add:
949 case Instruction::Sub:
952 case Instruction::And:
955 case Instruction::Or:
958 case Instruction::Xor:
965 EmitConstantValueOnly(CE->getOperand(1));
969 llvm_unreachable("Unsupported operator!");
972 llvm_unreachable("Unknown constant value!");
976 /// printAsCString - Print the specified array as a C compatible string, only if
977 /// the predicate isString is true.
979 static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
981 assert(CVA->isString() && "Array is not string compatible!");
984 for (unsigned i = 0; i != LastElt; ++i) {
986 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
987 printStringChar(O, C);
992 /// EmitString - Emit a zero-byte-terminated string constant.
994 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
995 unsigned NumElts = CVA->getNumOperands();
996 if (TAI->getAscizDirective() && NumElts &&
997 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
998 O << TAI->getAscizDirective();
999 printAsCString(O, CVA, NumElts-1);
1001 O << TAI->getAsciiDirective();
1002 printAsCString(O, CVA, NumElts);
1007 void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
1008 unsigned AddrSpace) {
1009 if (CVA->isString()) {
1011 } else { // Not a string. Print the values in successive locations
1012 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
1013 EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
1017 void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
1018 const VectorType *PTy = CP->getType();
1020 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
1021 EmitGlobalConstant(CP->getOperand(I));
1024 void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
1025 unsigned AddrSpace) {
1026 // Print the fields in successive locations. Pad to align if needed!
1027 const TargetData *TD = TM.getTargetData();
1028 unsigned Size = TD->getTypeAllocSize(CVS->getType());
1029 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
1030 uint64_t sizeSoFar = 0;
1031 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
1032 const Constant* field = CVS->getOperand(i);
1034 // Check if padding is needed and insert one or more 0s.
1035 uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
1036 uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
1037 - cvsLayout->getElementOffset(i)) - fieldSize;
1038 sizeSoFar += fieldSize + padSize;
1040 // Now print the actual field value.
1041 EmitGlobalConstant(field, AddrSpace);
1043 // Insert padding - this may include padding to increase the size of the
1044 // current field up to the ABI size (if the struct is not packed) as well
1045 // as padding to ensure that the next field starts at the right offset.
1046 EmitZeros(padSize, AddrSpace);
1048 assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
1049 "Layout of constant struct may be incorrect!");
1052 void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1053 unsigned AddrSpace) {
1054 // FP Constants are printed as integer constants to avoid losing
1056 const TargetData *TD = TM.getTargetData();
1057 if (CFP->getType() == Type::DoubleTy) {
1058 double Val = CFP->getValueAPF().convertToDouble(); // for comment only
1059 uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1060 if (TAI->getData64bitsDirective(AddrSpace)) {
1061 O << TAI->getData64bitsDirective(AddrSpace) << i;
1063 O << '\t' << TAI->getCommentString() << " double value: " << Val;
1065 } else if (TD->isBigEndian()) {
1066 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1068 O << '\t' << TAI->getCommentString()
1069 << " double most significant word " << Val;
1071 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1073 O << '\t' << TAI->getCommentString()
1074 << " double least significant word " << Val;
1077 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1079 O << '\t' << TAI->getCommentString()
1080 << " double least significant word " << Val;
1082 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1084 O << '\t' << TAI->getCommentString()
1085 << " double most significant word " << Val;
1089 } else if (CFP->getType() == Type::FloatTy) {
1090 float Val = CFP->getValueAPF().convertToFloat(); // for comment only
1091 O << TAI->getData32bitsDirective(AddrSpace)
1092 << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1094 O << '\t' << TAI->getCommentString() << " float " << Val;
1097 } else if (CFP->getType() == Type::X86_FP80Ty) {
1098 // all long double variants are printed as hex
1099 // api needed to prevent premature destruction
1100 APInt api = CFP->getValueAPF().bitcastToAPInt();
1101 const uint64_t *p = api.getRawData();
1102 // Convert to double so we can print the approximate val as a comment.
1103 APFloat DoubleVal = CFP->getValueAPF();
1105 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1107 if (TD->isBigEndian()) {
1108 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1110 O << '\t' << TAI->getCommentString()
1111 << " long double most significant halfword of ~"
1112 << DoubleVal.convertToDouble();
1114 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1116 O << '\t' << TAI->getCommentString() << " long double next halfword";
1118 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1120 O << '\t' << TAI->getCommentString() << " long double next halfword";
1122 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1124 O << '\t' << TAI->getCommentString() << " long double next halfword";
1126 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1128 O << '\t' << TAI->getCommentString()
1129 << " long double least significant halfword";
1132 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1134 O << '\t' << TAI->getCommentString()
1135 << " long double least significant halfword of ~"
1136 << DoubleVal.convertToDouble();
1138 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1140 O << '\t' << TAI->getCommentString()
1141 << " long double next halfword";
1143 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1145 O << '\t' << TAI->getCommentString()
1146 << " long double next halfword";
1148 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1150 O << '\t' << TAI->getCommentString()
1151 << " long double next halfword";
1153 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1155 O << '\t' << TAI->getCommentString()
1156 << " long double most significant halfword";
1159 EmitZeros(TD->getTypeAllocSize(Type::X86_FP80Ty) -
1160 TD->getTypeStoreSize(Type::X86_FP80Ty), AddrSpace);
1162 } else if (CFP->getType() == Type::PPC_FP128Ty) {
1163 // all long double variants are printed as hex
1164 // api needed to prevent premature destruction
1165 APInt api = CFP->getValueAPF().bitcastToAPInt();
1166 const uint64_t *p = api.getRawData();
1167 if (TD->isBigEndian()) {
1168 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1170 O << '\t' << TAI->getCommentString()
1171 << " long double most significant word";
1173 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1175 O << '\t' << TAI->getCommentString()
1176 << " long double next word";
1178 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1180 O << '\t' << TAI->getCommentString()
1181 << " long double next word";
1183 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1185 O << '\t' << TAI->getCommentString()
1186 << " long double least significant word";
1189 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1191 O << '\t' << TAI->getCommentString()
1192 << " long double least significant word";
1194 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1196 O << '\t' << TAI->getCommentString()
1197 << " long double next word";
1199 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1201 O << '\t' << TAI->getCommentString()
1202 << " long double next word";
1204 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1206 O << '\t' << TAI->getCommentString()
1207 << " long double most significant word";
1211 } else llvm_unreachable("Floating point constant type not handled");
1214 void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1215 unsigned AddrSpace) {
1216 const TargetData *TD = TM.getTargetData();
1217 unsigned BitWidth = CI->getBitWidth();
1218 assert(isPowerOf2_32(BitWidth) &&
1219 "Non-power-of-2-sized integers not handled!");
1221 // We don't expect assemblers to support integer data directives
1222 // for more than 64 bits, so we emit the data in at most 64-bit
1223 // quantities at a time.
1224 const uint64_t *RawData = CI->getValue().getRawData();
1225 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1227 if (TD->isBigEndian())
1228 Val = RawData[e - i - 1];
1232 if (TAI->getData64bitsDirective(AddrSpace))
1233 O << TAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1234 else if (TD->isBigEndian()) {
1235 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1237 O << '\t' << TAI->getCommentString()
1238 << " Double-word most significant word " << Val;
1240 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1242 O << '\t' << TAI->getCommentString()
1243 << " Double-word least significant word " << Val;
1246 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1248 O << '\t' << TAI->getCommentString()
1249 << " Double-word least significant word " << Val;
1251 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1253 O << '\t' << TAI->getCommentString()
1254 << " Double-word most significant word " << Val;
1260 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1261 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1262 const TargetData *TD = TM.getTargetData();
1263 const Type *type = CV->getType();
1264 unsigned Size = TD->getTypeAllocSize(type);
1266 if (CV->isNullValue() || isa<UndefValue>(CV)) {
1267 EmitZeros(Size, AddrSpace);
1269 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1270 EmitGlobalConstantArray(CVA , AddrSpace);
1272 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1273 EmitGlobalConstantStruct(CVS, AddrSpace);
1275 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1276 EmitGlobalConstantFP(CFP, AddrSpace);
1278 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1279 // Small integers are handled below; large integers are handled here.
1281 EmitGlobalConstantLargeInt(CI, AddrSpace);
1284 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1285 EmitGlobalConstantVector(CP);
1289 printDataDirective(type, AddrSpace);
1290 EmitConstantValueOnly(CV);
1292 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1294 CI->getValue().toStringUnsigned(S, 16);
1295 O << "\t\t\t" << TAI->getCommentString() << " 0x" << S.c_str();
1301 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1302 // Target doesn't support this yet!
1303 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1306 /// PrintSpecial - Print information related to the specified machine instr
1307 /// that is independent of the operand, and may be independent of the instr
1308 /// itself. This can be useful for portably encoding the comment character
1309 /// or other bits of target-specific knowledge into the asmstrings. The
1310 /// syntax used is ${:comment}. Targets can override this to add support
1311 /// for their own strange codes.
1312 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1313 if (!strcmp(Code, "private")) {
1314 O << TAI->getPrivateGlobalPrefix();
1315 } else if (!strcmp(Code, "comment")) {
1317 O << TAI->getCommentString();
1318 } else if (!strcmp(Code, "uid")) {
1319 // Comparing the address of MI isn't sufficient, because machineinstrs may
1320 // be allocated to the same address across functions.
1321 const Function *ThisF = MI->getParent()->getParent()->getFunction();
1323 // If this is a new LastFn instruction, bump the counter.
1324 if (LastMI != MI || LastFn != ThisF) {
1332 raw_string_ostream Msg(msg);
1333 Msg << "Unknown special formatter '" << Code
1334 << "' for machine instr: " << *MI;
1335 llvm_report_error(Msg.str());
1339 /// processDebugLoc - Processes the debug information of each machine
1340 /// instruction's DebugLoc.
1341 void AsmPrinter::processDebugLoc(DebugLoc DL) {
1342 if (TAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) {
1343 if (!DL.isUnknown()) {
1344 DebugLocTuple CurDLT = MF->getDebugLocTuple(DL);
1346 if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT)
1347 printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,
1348 DICompileUnit(CurDLT.CompileUnit)));
1355 /// printInlineAsm - This method formats and prints the specified machine
1356 /// instruction that is an inline asm.
1357 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1358 unsigned NumOperands = MI->getNumOperands();
1360 // Count the number of register definitions.
1361 unsigned NumDefs = 0;
1362 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1364 assert(NumDefs != NumOperands-1 && "No asm string?");
1366 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1368 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1369 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1371 // If this asmstr is empty, just print the #APP/#NOAPP markers.
1372 // These are useful to see where empty asm's wound up.
1373 if (AsmStr[0] == 0) {
1374 O << TAI->getInlineAsmStart() << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1378 O << TAI->getInlineAsmStart() << "\n\t";
1380 // The variant of the current asmprinter.
1381 int AsmPrinterVariant = TAI->getAssemblerDialect();
1383 int CurVariant = -1; // The number of the {.|.|.} region we are in.
1384 const char *LastEmitted = AsmStr; // One past the last character emitted.
1386 while (*LastEmitted) {
1387 switch (*LastEmitted) {
1389 // Not a special case, emit the string section literally.
1390 const char *LiteralEnd = LastEmitted+1;
1391 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1392 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1394 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1395 O.write(LastEmitted, LiteralEnd-LastEmitted);
1396 LastEmitted = LiteralEnd;
1400 ++LastEmitted; // Consume newline character.
1401 O << '\n'; // Indent code with newline.
1404 ++LastEmitted; // Consume '$' character.
1408 switch (*LastEmitted) {
1409 default: Done = false; break;
1410 case '$': // $$ -> $
1411 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1413 ++LastEmitted; // Consume second '$' character.
1415 case '(': // $( -> same as GCC's { character.
1416 ++LastEmitted; // Consume '(' character.
1417 if (CurVariant != -1) {
1418 llvm_report_error("Nested variants found in inline asm string: '"
1419 + std::string(AsmStr) + "'");
1421 CurVariant = 0; // We're in the first variant now.
1424 ++LastEmitted; // consume '|' character.
1425 if (CurVariant == -1)
1426 O << '|'; // this is gcc's behavior for | outside a variant
1428 ++CurVariant; // We're in the next variant.
1430 case ')': // $) -> same as GCC's } char.
1431 ++LastEmitted; // consume ')' character.
1432 if (CurVariant == -1)
1433 O << '}'; // this is gcc's behavior for } outside a variant
1440 bool HasCurlyBraces = false;
1441 if (*LastEmitted == '{') { // ${variable}
1442 ++LastEmitted; // Consume '{' character.
1443 HasCurlyBraces = true;
1446 // If we have ${:foo}, then this is not a real operand reference, it is a
1447 // "magic" string reference, just like in .td files. Arrange to call
1449 if (HasCurlyBraces && *LastEmitted == ':') {
1451 const char *StrStart = LastEmitted;
1452 const char *StrEnd = strchr(StrStart, '}');
1454 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1455 + std::string(AsmStr) + "'");
1458 std::string Val(StrStart, StrEnd);
1459 PrintSpecial(MI, Val.c_str());
1460 LastEmitted = StrEnd+1;
1464 const char *IDStart = LastEmitted;
1467 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1468 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1469 llvm_report_error("Bad $ operand number in inline asm string: '"
1470 + std::string(AsmStr) + "'");
1472 LastEmitted = IDEnd;
1474 char Modifier[2] = { 0, 0 };
1476 if (HasCurlyBraces) {
1477 // If we have curly braces, check for a modifier character. This
1478 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1479 if (*LastEmitted == ':') {
1480 ++LastEmitted; // Consume ':' character.
1481 if (*LastEmitted == 0) {
1482 llvm_report_error("Bad ${:} expression in inline asm string: '"
1483 + std::string(AsmStr) + "'");
1486 Modifier[0] = *LastEmitted;
1487 ++LastEmitted; // Consume modifier character.
1490 if (*LastEmitted != '}') {
1491 llvm_report_error("Bad ${} expression in inline asm string: '"
1492 + std::string(AsmStr) + "'");
1494 ++LastEmitted; // Consume '}' character.
1497 if ((unsigned)Val >= NumOperands-1) {
1498 llvm_report_error("Invalid $ operand number in inline asm string: '"
1499 + std::string(AsmStr) + "'");
1502 // Okay, we finally have a value number. Ask the target to print this
1504 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1509 // Scan to find the machine operand number for the operand.
1510 for (; Val; --Val) {
1511 if (OpNo >= MI->getNumOperands()) break;
1512 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1513 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1516 if (OpNo >= MI->getNumOperands()) {
1519 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1520 ++OpNo; // Skip over the ID number.
1522 if (Modifier[0]=='l') // labels are target independent
1523 printBasicBlockLabel(MI->getOperand(OpNo).getMBB(),
1524 false, false, false);
1526 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1527 if ((OpFlags & 7) == 4) {
1528 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1529 Modifier[0] ? Modifier : 0);
1531 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1532 Modifier[0] ? Modifier : 0);
1538 raw_string_ostream Msg(msg);
1539 Msg << "Invalid operand found in inline asm: '"
1542 llvm_report_error(Msg.str());
1549 O << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1552 /// printImplicitDef - This method prints the specified machine instruction
1553 /// that is an implicit def.
1554 void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1556 O << '\t' << TAI->getCommentString() << " implicit-def: "
1557 << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n';
1560 /// printLabel - This method prints a local label used by debug and
1561 /// exception handling tables.
1562 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1563 printLabel(MI->getOperand(0).getImm());
1566 void AsmPrinter::printLabel(unsigned Id) const {
1567 O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n";
1570 /// printDeclare - This method prints a local variable declaration used by
1572 /// FIXME: It doesn't really print anything rather it inserts a DebugVariable
1573 /// entry into dwarf table.
1574 void AsmPrinter::printDeclare(const MachineInstr *MI) const {
1575 unsigned FI = MI->getOperand(0).getIndex();
1576 GlobalValue *GV = MI->getOperand(1).getGlobal();
1577 DW->RecordVariable(cast<GlobalVariable>(GV), FI, MI);
1580 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1581 /// instruction, using the specified assembler variant. Targets should
1582 /// overried this to format as appropriate.
1583 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1584 unsigned AsmVariant, const char *ExtraCode) {
1585 // Target doesn't support this yet!
1589 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1590 unsigned AsmVariant,
1591 const char *ExtraCode) {
1592 // Target doesn't support this yet!
1596 /// printBasicBlockLabel - This method prints the label for the specified
1597 /// MachineBasicBlock
1598 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1601 bool printComment) const {
1603 unsigned Align = MBB->getAlignment();
1605 EmitAlignment(Log2_32(Align));
1608 O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_'
1609 << MBB->getNumber();
1612 if (printComment && MBB->getBasicBlock())
1613 O << '\t' << TAI->getCommentString() << ' '
1614 << MBB->getBasicBlock()->getNameStr();
1617 /// printPICJumpTableSetLabel - This method prints a set label for the
1618 /// specified MachineBasicBlock for a jumptable entry.
1619 void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1620 const MachineBasicBlock *MBB) const {
1621 if (!TAI->getSetDirective())
1624 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1625 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1626 printBasicBlockLabel(MBB, false, false, false);
1627 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1628 << '_' << uid << '\n';
1631 void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1632 const MachineBasicBlock *MBB) const {
1633 if (!TAI->getSetDirective())
1636 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1637 << getFunctionNumber() << '_' << uid << '_' << uid2
1638 << "_set_" << MBB->getNumber() << ',';
1639 printBasicBlockLabel(MBB, false, false, false);
1640 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1641 << '_' << uid << '_' << uid2 << '\n';
1644 /// printDataDirective - This method prints the asm directive for the
1646 void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1647 const TargetData *TD = TM.getTargetData();
1648 switch (type->getTypeID()) {
1649 case Type::FloatTyID: case Type::DoubleTyID:
1650 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1651 assert(0 && "Should have already output floating point constant.");
1653 assert(0 && "Can't handle printing this type of thing");
1654 case Type::IntegerTyID: {
1655 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1657 O << TAI->getData8bitsDirective(AddrSpace);
1658 else if (BitWidth <= 16)
1659 O << TAI->getData16bitsDirective(AddrSpace);
1660 else if (BitWidth <= 32)
1661 O << TAI->getData32bitsDirective(AddrSpace);
1662 else if (BitWidth <= 64) {
1663 assert(TAI->getData64bitsDirective(AddrSpace) &&
1664 "Target cannot handle 64-bit constant exprs!");
1665 O << TAI->getData64bitsDirective(AddrSpace);
1667 llvm_unreachable("Target cannot handle given data directive width!");
1671 case Type::PointerTyID:
1672 if (TD->getPointerSize() == 8) {
1673 assert(TAI->getData64bitsDirective(AddrSpace) &&
1674 "Target cannot handle 64-bit pointer exprs!");
1675 O << TAI->getData64bitsDirective(AddrSpace);
1676 } else if (TD->getPointerSize() == 2) {
1677 O << TAI->getData16bitsDirective(AddrSpace);
1678 } else if (TD->getPointerSize() == 1) {
1679 O << TAI->getData8bitsDirective(AddrSpace);
1681 O << TAI->getData32bitsDirective(AddrSpace);
1687 void AsmPrinter::printVisibility(const std::string& Name,
1688 unsigned Visibility) const {
1689 if (Visibility == GlobalValue::HiddenVisibility) {
1690 if (const char *Directive = TAI->getHiddenDirective())
1691 O << Directive << Name << '\n';
1692 } else if (Visibility == GlobalValue::ProtectedVisibility) {
1693 if (const char *Directive = TAI->getProtectedDirective())
1694 O << Directive << Name << '\n';
1698 void AsmPrinter::printOffset(int64_t Offset) const {
1701 else if (Offset < 0)
1705 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1706 if (!S->usesMetadata())
1709 gcp_iterator GCPI = GCMetadataPrinters.find(S);
1710 if (GCPI != GCMetadataPrinters.end())
1711 return GCPI->second;
1713 const char *Name = S->getName().c_str();
1715 for (GCMetadataPrinterRegistry::iterator
1716 I = GCMetadataPrinterRegistry::begin(),
1717 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1718 if (strcmp(Name, I->getName()) == 0) {
1719 GCMetadataPrinter *GMP = I->instantiate();
1721 GCMetadataPrinters.insert(std::make_pair(S, GMP));
1725 cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1726 llvm_unreachable(0);
1729 /// EmitComments - Pretty-print comments for instructions
1730 void AsmPrinter::EmitComments(const MachineInstr &MI) const
1733 if (!MI.getDebugLoc().isUnknown()) {
1734 DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());
1736 // Print source line info
1737 O.PadToColumn(TAI->getCommentColumn(), 1);
1738 O << TAI->getCommentString() << " SrcLine ";
1739 if (DLT.CompileUnit->hasInitializer()) {
1740 Constant *Name = DLT.CompileUnit->getInitializer();
1741 if (ConstantArray *NameString = dyn_cast<ConstantArray>(Name))
1742 if (NameString->isString()) {
1743 O << NameString->getAsString() << " ";
1748 O << ":" << DLT.Col;
1753 /// EmitComments - Pretty-print comments for instructions
1754 void AsmPrinter::EmitComments(const MCInst &MI) const
1757 if (!MI.getDebugLoc().isUnknown()) {
1758 DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());
1760 // Print source line info
1761 O.PadToColumn(TAI->getCommentColumn(), 1);
1762 O << TAI->getCommentString() << " SrcLine ";
1763 if (DLT.CompileUnit->hasInitializer()) {
1764 Constant *Name = DLT.CompileUnit->getInitializer();
1765 if (ConstantArray *NameString = dyn_cast<ConstantArray>(Name))
1766 if (NameString->isString()) {
1767 O << NameString->getAsString() << " ";
1772 O << ":" << DLT.Col;