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/Support/CommandLine.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/FormattedStream.h"
28 #include "llvm/Support/Mangler.h"
29 #include "llvm/Support/raw_ostream.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(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.
139 O << TAI->getSwitchToSectionDirective()
141 << TAI->getSectionFlags(NS->getFlags());
144 O << TAI->getDataSectionStartSuffix() << '\n';
147 IsInTextSection = (NS->getFlags() & SectionFlags::Code);
150 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
151 MachineFunctionPass::getAnalysisUsage(AU);
152 AU.addRequired<GCModuleInfo>();
155 bool AsmPrinter::doInitialization(Module &M) {
156 Mang = new Mangler(M, TAI->getGlobalPrefix(), TAI->getPrivateGlobalPrefix());
158 if (TAI->doesAllowQuotesInName())
159 Mang->setUseQuotes(true);
161 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
162 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
164 if (TAI->hasSingleParameterDotFile()) {
165 /* Very minimal debug info. It is ignored if we emit actual
166 debug info. If we don't, this at helps the user find where
167 a function came from. */
168 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
171 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
172 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
173 MP->beginAssembly(O, *this, *TAI);
175 if (!M.getModuleInlineAsm().empty())
176 O << TAI->getCommentString() << " Start of file scope inline assembly\n"
177 << M.getModuleInlineAsm()
178 << '\n' << TAI->getCommentString()
179 << " End of file scope inline assembly\n";
181 SwitchToDataSection(""); // Reset back to no section.
183 if (TAI->doesSupportDebugInformation() ||
184 TAI->doesSupportExceptionHandling()) {
185 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
187 MMI->AnalyzeModule(M);
188 DW = getAnalysisIfAvailable<DwarfWriter>();
190 DW->BeginModule(&M, MMI, O, this, TAI);
196 bool AsmPrinter::doFinalization(Module &M) {
197 // Emit final debug information.
198 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
201 // If the target wants to know about weak references, print them all.
202 if (TAI->getWeakRefDirective()) {
203 // FIXME: This is not lazy, it would be nice to only print weak references
204 // to stuff that is actually used. Note that doing so would require targets
205 // to notice uses in operands (due to constant exprs etc). This should
206 // happen with the MC stuff eventually.
207 SwitchToDataSection("");
209 // Print out module-level global variables here.
210 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
212 if (I->hasExternalWeakLinkage())
213 O << TAI->getWeakRefDirective() << Mang->getValueName(I) << '\n';
216 for (Module::const_iterator I = M.begin(), E = M.end();
218 if (I->hasExternalWeakLinkage())
219 O << TAI->getWeakRefDirective() << Mang->getValueName(I) << '\n';
223 if (TAI->getSetDirective()) {
224 if (!M.alias_empty())
225 SwitchToSection(TAI->getTextSection());
228 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
230 std::string Name = Mang->getValueName(I);
233 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
234 Target = Mang->getValueName(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->getValueName(MF->getFunction());
275 Name = Mang->makeNameProper(TAI->getEHGlobalPrefix() + Name + ".eh");
279 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
280 // What's my mangled name?
281 CurrentFnName = Mang->getValueName(MF.getFunction());
282 IncrementFunctionNumber();
286 // SectionCPs - Keep track the alignment, constpool entries per Section.
290 SmallVector<unsigned, 4> CPEs;
291 SectionCPs(const Section *s, unsigned a) : S(s), Alignment(a) {};
295 /// EmitConstantPool - Print to the current output stream assembly
296 /// representations of the constants in the constant pool MCP. This is
297 /// used to print out constants which have been "spilled to memory" by
298 /// the code generator.
300 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
301 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
302 if (CP.empty()) return;
304 // Calculate sections for constant pool entries. We collect entries to go into
305 // the same section together to reduce amount of section switch statements.
306 SmallVector<SectionCPs, 4> CPSections;
307 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
308 MachineConstantPoolEntry CPE = CP[i];
309 unsigned Align = CPE.getAlignment();
310 const Section* S = TAI->SelectSectionForMachineConst(CPE.getType());
311 // The number of sections are small, just do a linear search from the
312 // last section to the first.
314 unsigned SecIdx = CPSections.size();
315 while (SecIdx != 0) {
316 if (CPSections[--SecIdx].S == S) {
322 SecIdx = CPSections.size();
323 CPSections.push_back(SectionCPs(S, Align));
326 if (Align > CPSections[SecIdx].Alignment)
327 CPSections[SecIdx].Alignment = Align;
328 CPSections[SecIdx].CPEs.push_back(i);
331 // Now print stuff into the calculated sections.
332 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
333 SwitchToSection(CPSections[i].S);
334 EmitAlignment(Log2_32(CPSections[i].Alignment));
337 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
338 unsigned CPI = CPSections[i].CPEs[j];
339 MachineConstantPoolEntry CPE = CP[CPI];
341 // Emit inter-object padding for alignment.
342 unsigned AlignMask = CPE.getAlignment() - 1;
343 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
344 EmitZeros(NewOffset - Offset);
346 const Type *Ty = CPE.getType();
347 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
349 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
350 << CPI << ":\t\t\t\t\t";
352 O << TAI->getCommentString() << ' ';
353 WriteTypeSymbolic(O, CPE.getType(), 0);
356 if (CPE.isMachineConstantPoolEntry())
357 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
359 EmitGlobalConstant(CPE.Val.ConstVal);
364 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
365 /// by the current function to the current output stream.
367 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
368 MachineFunction &MF) {
369 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
370 if (JT.empty()) return;
372 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
374 // Pick the directive to use to print the jump table entries, and switch to
375 // the appropriate section.
376 TargetLowering *LoweringInfo = TM.getTargetLowering();
378 const char* JumpTableDataSection = TAI->getJumpTableDataSection();
379 const Function *F = MF.getFunction();
380 unsigned SectionFlags = TAI->SectionFlagsForGlobal(F);
381 bool JTInDiffSection = false;
382 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
383 !JumpTableDataSection ||
384 SectionFlags & SectionFlags::Linkonce) {
385 // In PIC mode, we need to emit the jump table to the same section as the
386 // function body itself, otherwise the label differences won't make sense.
387 // We should also do if the section name is NULL or function is declared in
388 // discardable section.
389 SwitchToSection(TAI->SectionForGlobal(F));
391 SwitchToDataSection(JumpTableDataSection);
392 JTInDiffSection = true;
395 EmitAlignment(Log2_32(MJTI->getAlignment()));
397 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
398 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
400 // If this jump table was deleted, ignore it.
401 if (JTBBs.empty()) continue;
403 // For PIC codegen, if possible we want to use the SetDirective to reduce
404 // the number of relocations the assembler will generate for the jump table.
405 // Set directives are all printed before the jump table itself.
406 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
407 if (TAI->getSetDirective() && IsPic)
408 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
409 if (EmittedSets.insert(JTBBs[ii]))
410 printPICJumpTableSetLabel(i, JTBBs[ii]);
412 // On some targets (e.g. darwin) we want to emit two consequtive labels
413 // before each jump table. The first label is never referenced, but tells
414 // the assembler and linker the extents of the jump table object. The
415 // second label is actually referenced by the code.
416 if (JTInDiffSection) {
417 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
418 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
421 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
422 << '_' << i << ":\n";
424 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
425 printPICJumpTableEntry(MJTI, JTBBs[ii], i);
431 void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
432 const MachineBasicBlock *MBB,
433 unsigned uid) const {
434 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
436 // Use JumpTableDirective otherwise honor the entry size from the jump table
438 const char *JTEntryDirective = TAI->getJumpTableDirective();
439 bool HadJTEntryDirective = JTEntryDirective != NULL;
440 if (!HadJTEntryDirective) {
441 JTEntryDirective = MJTI->getEntrySize() == 4 ?
442 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
445 O << JTEntryDirective << ' ';
447 // If we have emitted set directives for the jump table entries, print
448 // them rather than the entries themselves. If we're emitting PIC, then
449 // emit the table entries as differences between two text section labels.
450 // If we're emitting non-PIC code, then emit the entries as direct
451 // references to the target basic blocks.
453 if (TAI->getSetDirective()) {
454 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
455 << '_' << uid << "_set_" << MBB->getNumber();
457 printBasicBlockLabel(MBB, false, false, false);
458 // If the arch uses custom Jump Table directives, don't calc relative to
460 if (!HadJTEntryDirective)
461 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
462 << getFunctionNumber() << '_' << uid;
465 printBasicBlockLabel(MBB, false, false, false);
470 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
471 /// special global used by LLVM. If so, emit it and return true, otherwise
472 /// do nothing and return false.
473 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
474 if (GV->getName() == "llvm.used") {
475 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
476 EmitLLVMUsedList(GV->getInitializer());
480 // Ignore debug and non-emitted data.
481 if (GV->getSection() == "llvm.metadata" ||
482 GV->hasAvailableExternallyLinkage())
485 if (!GV->hasAppendingLinkage()) return false;
487 assert(GV->hasInitializer() && "Not a special LLVM global!");
489 const TargetData *TD = TM.getTargetData();
490 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
491 if (GV->getName() == "llvm.global_ctors") {
492 SwitchToDataSection(TAI->getStaticCtorsSection());
493 EmitAlignment(Align, 0);
494 EmitXXStructorList(GV->getInitializer());
498 if (GV->getName() == "llvm.global_dtors") {
499 SwitchToDataSection(TAI->getStaticDtorsSection());
500 EmitAlignment(Align, 0);
501 EmitXXStructorList(GV->getInitializer());
508 /// findGlobalValue - if CV is an expression equivalent to a single
509 /// global value, return that value.
510 const GlobalValue * AsmPrinter::findGlobalValue(const Constant *CV) {
511 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
513 else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
514 const TargetData *TD = TM.getTargetData();
515 unsigned Opcode = CE->getOpcode();
517 case Instruction::GetElementPtr: {
518 const Constant *ptrVal = CE->getOperand(0);
519 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
520 if (TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], idxVec.size()))
522 return findGlobalValue(ptrVal);
524 case Instruction::BitCast:
525 return findGlobalValue(CE->getOperand(0));
533 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
534 /// global in the specified llvm.used list for which emitUsedDirectiveFor
535 /// is true, as being used with this directive.
537 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
538 const char *Directive = TAI->getUsedDirective();
540 // Should be an array of 'i8*'.
541 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
542 if (InitList == 0) return;
544 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
545 const GlobalValue *GV = findGlobalValue(InitList->getOperand(i));
546 if (TAI->emitUsedDirectiveFor(GV, Mang)) {
548 EmitConstantValueOnly(InitList->getOperand(i));
554 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
555 /// function pointers, ignoring the init priority.
556 void AsmPrinter::EmitXXStructorList(Constant *List) {
557 // Should be an array of '{ int, void ()* }' structs. The first value is the
558 // init priority, which we ignore.
559 if (!isa<ConstantArray>(List)) return;
560 ConstantArray *InitList = cast<ConstantArray>(List);
561 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
562 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
563 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
565 if (CS->getOperand(1)->isNullValue())
566 return; // Found a null terminator, exit printing.
567 // Emit the function pointer.
568 EmitGlobalConstant(CS->getOperand(1));
572 /// getGlobalLinkName - Returns the asm/link name of of the specified
573 /// global variable. Should be overridden by each target asm printer to
574 /// generate the appropriate value.
575 const std::string &AsmPrinter::getGlobalLinkName(const GlobalVariable *GV,
576 std::string &LinkName) const {
577 if (isa<Function>(GV)) {
578 LinkName += TAI->getFunctionAddrPrefix();
579 LinkName += Mang->getValueName(GV);
580 LinkName += TAI->getFunctionAddrSuffix();
582 LinkName += TAI->getGlobalVarAddrPrefix();
583 LinkName += Mang->getValueName(GV);
584 LinkName += TAI->getGlobalVarAddrSuffix();
590 /// EmitExternalGlobal - Emit the external reference to a global variable.
591 /// Should be overridden if an indirect reference should be used.
592 void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
594 O << getGlobalLinkName(GV, GLN);
599 //===----------------------------------------------------------------------===//
600 /// LEB 128 number encoding.
602 /// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
603 /// representing an unsigned leb128 value.
604 void AsmPrinter::PrintULEB128(unsigned Value) const {
607 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
609 if (Value) Byte |= 0x80;
610 O << "0x" << utohex_buffer(Byte, Buffer+20);
611 if (Value) O << ", ";
615 /// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
616 /// representing a signed leb128 value.
617 void AsmPrinter::PrintSLEB128(int Value) const {
618 int Sign = Value >> (8 * sizeof(Value) - 1);
623 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
625 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
626 if (IsMore) Byte |= 0x80;
627 O << "0x" << utohex_buffer(Byte, Buffer+20);
628 if (IsMore) O << ", ";
632 //===--------------------------------------------------------------------===//
633 // Emission and print routines
636 /// PrintHex - Print a value as a hexidecimal value.
638 void AsmPrinter::PrintHex(int Value) const {
640 O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20);
643 /// EOL - Print a newline character to asm stream. If a comment is present
644 /// then it will be printed first. Comments should not contain '\n'.
645 void AsmPrinter::EOL() const {
649 void AsmPrinter::EOL(const std::string &Comment) const {
650 if (VerboseAsm && !Comment.empty()) {
652 << TAI->getCommentString()
659 void AsmPrinter::EOL(const char* Comment) const {
660 if (VerboseAsm && *Comment) {
662 << TAI->getCommentString()
669 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
670 /// unsigned leb128 value.
671 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
672 if (TAI->hasLEB128()) {
676 O << TAI->getData8bitsDirective();
681 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
682 /// signed leb128 value.
683 void AsmPrinter::EmitSLEB128Bytes(int Value) const {
684 if (TAI->hasLEB128()) {
688 O << TAI->getData8bitsDirective();
693 /// EmitInt8 - Emit a byte directive and value.
695 void AsmPrinter::EmitInt8(int Value) const {
696 O << TAI->getData8bitsDirective();
697 PrintHex(Value & 0xFF);
700 /// EmitInt16 - Emit a short directive and value.
702 void AsmPrinter::EmitInt16(int Value) const {
703 O << TAI->getData16bitsDirective();
704 PrintHex(Value & 0xFFFF);
707 /// EmitInt32 - Emit a long directive and value.
709 void AsmPrinter::EmitInt32(int Value) const {
710 O << TAI->getData32bitsDirective();
714 /// EmitInt64 - Emit a long long directive and value.
716 void AsmPrinter::EmitInt64(uint64_t Value) const {
717 if (TAI->getData64bitsDirective()) {
718 O << TAI->getData64bitsDirective();
721 if (TM.getTargetData()->isBigEndian()) {
722 EmitInt32(unsigned(Value >> 32)); O << '\n';
723 EmitInt32(unsigned(Value));
725 EmitInt32(unsigned(Value)); O << '\n';
726 EmitInt32(unsigned(Value >> 32));
731 /// toOctal - Convert the low order bits of X into an octal digit.
733 static inline char toOctal(int X) {
737 /// printStringChar - Print a char, escaped if necessary.
739 static void printStringChar(raw_ostream &O, unsigned char C) {
742 } else if (C == '\\') {
744 } else if (isprint((unsigned char)C)) {
748 case '\b': O << "\\b"; break;
749 case '\f': O << "\\f"; break;
750 case '\n': O << "\\n"; break;
751 case '\r': O << "\\r"; break;
752 case '\t': O << "\\t"; break;
755 O << toOctal(C >> 6);
756 O << toOctal(C >> 3);
757 O << toOctal(C >> 0);
763 /// EmitString - Emit a string with quotes and a null terminator.
764 /// Special characters are emitted properly.
765 /// \literal (Eg. '\t') \endliteral
766 void AsmPrinter::EmitString(const std::string &String) const {
767 EmitString(String.c_str(), String.size());
770 void AsmPrinter::EmitString(const char *String, unsigned Size) const {
771 const char* AscizDirective = TAI->getAscizDirective();
775 O << TAI->getAsciiDirective();
777 for (unsigned i = 0; i < Size; ++i)
778 printStringChar(O, String[i]);
786 /// EmitFile - Emit a .file directive.
787 void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
788 O << "\t.file\t" << Number << " \"";
789 for (unsigned i = 0, N = Name.size(); i < N; ++i)
790 printStringChar(O, Name[i]);
795 //===----------------------------------------------------------------------===//
797 // EmitAlignment - Emit an alignment directive to the specified power of
798 // two boundary. For example, if you pass in 3 here, you will get an 8
799 // byte alignment. If a global value is specified, and if that global has
800 // an explicit alignment requested, it will unconditionally override the
801 // alignment request. However, if ForcedAlignBits is specified, this value
802 // has final say: the ultimate alignment will be the max of ForcedAlignBits
803 // and the alignment computed with NumBits and the global.
807 // if (GV && GV->hasalignment) Align = GV->getalignment();
808 // Align = std::max(Align, ForcedAlignBits);
810 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
811 unsigned ForcedAlignBits,
812 bool UseFillExpr) const {
813 if (GV && GV->getAlignment())
814 NumBits = Log2_32(GV->getAlignment());
815 NumBits = std::max(NumBits, ForcedAlignBits);
817 if (NumBits == 0) return; // No need to emit alignment.
818 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
819 O << TAI->getAlignDirective() << NumBits;
821 unsigned FillValue = TAI->getTextAlignFillValue();
822 UseFillExpr &= IsInTextSection && FillValue;
831 /// EmitZeros - Emit a block of zeros.
833 void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
835 if (TAI->getZeroDirective()) {
836 O << TAI->getZeroDirective() << NumZeros;
837 if (TAI->getZeroDirectiveSuffix())
838 O << TAI->getZeroDirectiveSuffix();
841 for (; NumZeros; --NumZeros)
842 O << TAI->getData8bitsDirective(AddrSpace) << "0\n";
847 // Print out the specified constant, without a storage class. Only the
848 // constants valid in constant expressions can occur here.
849 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
850 if (CV->isNullValue() || isa<UndefValue>(CV))
852 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
853 O << CI->getZExtValue();
854 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
855 // This is a constant address for a global variable or function. Use the
856 // name of the variable or function as the address value, possibly
857 // decorating it with GlobalVarAddrPrefix/Suffix or
858 // FunctionAddrPrefix/Suffix (these all default to "" )
859 if (isa<Function>(GV)) {
860 O << TAI->getFunctionAddrPrefix()
861 << Mang->getValueName(GV)
862 << TAI->getFunctionAddrSuffix();
864 O << TAI->getGlobalVarAddrPrefix()
865 << Mang->getValueName(GV)
866 << TAI->getGlobalVarAddrSuffix();
868 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
869 const TargetData *TD = TM.getTargetData();
870 unsigned Opcode = CE->getOpcode();
872 case Instruction::GetElementPtr: {
873 // generate a symbolic expression for the byte address
874 const Constant *ptrVal = CE->getOperand(0);
875 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
876 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
878 // Truncate/sext the offset to the pointer size.
879 if (TD->getPointerSizeInBits() != 64) {
880 int SExtAmount = 64-TD->getPointerSizeInBits();
881 Offset = (Offset << SExtAmount) >> SExtAmount;
886 EmitConstantValueOnly(ptrVal);
888 O << ") + " << Offset;
890 O << ") - " << -Offset;
892 EmitConstantValueOnly(ptrVal);
896 case Instruction::Trunc:
897 case Instruction::ZExt:
898 case Instruction::SExt:
899 case Instruction::FPTrunc:
900 case Instruction::FPExt:
901 case Instruction::UIToFP:
902 case Instruction::SIToFP:
903 case Instruction::FPToUI:
904 case Instruction::FPToSI:
905 llvm_unreachable("FIXME: Don't yet support this kind of constant cast expr");
907 case Instruction::BitCast:
908 return EmitConstantValueOnly(CE->getOperand(0));
910 case Instruction::IntToPtr: {
911 // Handle casts to pointers by changing them into casts to the appropriate
912 // integer type. This promotes constant folding and simplifies this code.
913 Constant *Op = CE->getOperand(0);
914 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
915 return EmitConstantValueOnly(Op);
919 case Instruction::PtrToInt: {
920 // Support only foldable casts to/from pointers that can be eliminated by
921 // changing the pointer to the appropriately sized integer type.
922 Constant *Op = CE->getOperand(0);
923 const Type *Ty = CE->getType();
925 // We can emit the pointer value into this slot if the slot is an
926 // integer slot greater or equal to the size of the pointer.
927 if (TD->getTypeAllocSize(Ty) >= TD->getTypeAllocSize(Op->getType()))
928 return EmitConstantValueOnly(Op);
931 EmitConstantValueOnly(Op);
932 APInt ptrMask = APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Ty));
935 ptrMask.toStringUnsigned(S);
936 O << ") & " << S.c_str() << ')';
939 case Instruction::Add:
940 case Instruction::Sub:
941 case Instruction::And:
942 case Instruction::Or:
943 case Instruction::Xor:
945 EmitConstantValueOnly(CE->getOperand(0));
948 case Instruction::Add:
951 case Instruction::Sub:
954 case Instruction::And:
957 case Instruction::Or:
960 case Instruction::Xor:
967 EmitConstantValueOnly(CE->getOperand(1));
971 llvm_unreachable("Unsupported operator!");
974 llvm_unreachable("Unknown constant value!");
978 /// printAsCString - Print the specified array as a C compatible string, only if
979 /// the predicate isString is true.
981 static void printAsCString(raw_ostream &O, const ConstantArray *CVA,
983 assert(CVA->isString() && "Array is not string compatible!");
986 for (unsigned i = 0; i != LastElt; ++i) {
988 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
989 printStringChar(O, C);
994 /// EmitString - Emit a zero-byte-terminated string constant.
996 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
997 unsigned NumElts = CVA->getNumOperands();
998 if (TAI->getAscizDirective() && NumElts &&
999 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
1000 O << TAI->getAscizDirective();
1001 printAsCString(O, CVA, NumElts-1);
1003 O << TAI->getAsciiDirective();
1004 printAsCString(O, CVA, NumElts);
1009 void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
1010 unsigned AddrSpace) {
1011 if (CVA->isString()) {
1013 } else { // Not a string. Print the values in successive locations
1014 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
1015 EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
1019 void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
1020 const VectorType *PTy = CP->getType();
1022 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
1023 EmitGlobalConstant(CP->getOperand(I));
1026 void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
1027 unsigned AddrSpace) {
1028 // Print the fields in successive locations. Pad to align if needed!
1029 const TargetData *TD = TM.getTargetData();
1030 unsigned Size = TD->getTypeAllocSize(CVS->getType());
1031 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
1032 uint64_t sizeSoFar = 0;
1033 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
1034 const Constant* field = CVS->getOperand(i);
1036 // Check if padding is needed and insert one or more 0s.
1037 uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
1038 uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
1039 - cvsLayout->getElementOffset(i)) - fieldSize;
1040 sizeSoFar += fieldSize + padSize;
1042 // Now print the actual field value.
1043 EmitGlobalConstant(field, AddrSpace);
1045 // Insert padding - this may include padding to increase the size of the
1046 // current field up to the ABI size (if the struct is not packed) as well
1047 // as padding to ensure that the next field starts at the right offset.
1048 EmitZeros(padSize, AddrSpace);
1050 assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
1051 "Layout of constant struct may be incorrect!");
1054 void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1055 unsigned AddrSpace) {
1056 // FP Constants are printed as integer constants to avoid losing
1058 const TargetData *TD = TM.getTargetData();
1059 if (CFP->getType() == Type::DoubleTy) {
1060 double Val = CFP->getValueAPF().convertToDouble(); // for comment only
1061 uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1062 if (TAI->getData64bitsDirective(AddrSpace)) {
1063 O << TAI->getData64bitsDirective(AddrSpace) << i;
1065 O << '\t' << TAI->getCommentString() << " double value: " << Val;
1067 } else if (TD->isBigEndian()) {
1068 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1070 O << '\t' << TAI->getCommentString()
1071 << " double most significant word " << Val;
1073 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1075 O << '\t' << TAI->getCommentString()
1076 << " double least significant word " << Val;
1079 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1081 O << '\t' << TAI->getCommentString()
1082 << " double least significant word " << Val;
1084 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1086 O << '\t' << TAI->getCommentString()
1087 << " double most significant word " << Val;
1091 } else if (CFP->getType() == Type::FloatTy) {
1092 float Val = CFP->getValueAPF().convertToFloat(); // for comment only
1093 O << TAI->getData32bitsDirective(AddrSpace)
1094 << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1096 O << '\t' << TAI->getCommentString() << " float " << Val;
1099 } else if (CFP->getType() == Type::X86_FP80Ty) {
1100 // all long double variants are printed as hex
1101 // api needed to prevent premature destruction
1102 APInt api = CFP->getValueAPF().bitcastToAPInt();
1103 const uint64_t *p = api.getRawData();
1104 // Convert to double so we can print the approximate val as a comment.
1105 APFloat DoubleVal = CFP->getValueAPF();
1107 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1109 if (TD->isBigEndian()) {
1110 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1112 O << '\t' << TAI->getCommentString()
1113 << " long double most significant halfword of ~"
1114 << DoubleVal.convertToDouble();
1116 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1118 O << '\t' << TAI->getCommentString() << " long double next halfword";
1120 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1122 O << '\t' << TAI->getCommentString() << " long double next halfword";
1124 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1126 O << '\t' << TAI->getCommentString() << " long double next halfword";
1128 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1130 O << '\t' << TAI->getCommentString()
1131 << " long double least significant halfword";
1134 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1136 O << '\t' << TAI->getCommentString()
1137 << " long double least significant halfword of ~"
1138 << DoubleVal.convertToDouble();
1140 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1142 O << '\t' << TAI->getCommentString()
1143 << " long double next halfword";
1145 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1147 O << '\t' << TAI->getCommentString()
1148 << " long double next halfword";
1150 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1152 O << '\t' << TAI->getCommentString()
1153 << " long double next halfword";
1155 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1157 O << '\t' << TAI->getCommentString()
1158 << " long double most significant halfword";
1161 EmitZeros(TD->getTypeAllocSize(Type::X86_FP80Ty) -
1162 TD->getTypeStoreSize(Type::X86_FP80Ty), AddrSpace);
1164 } else if (CFP->getType() == Type::PPC_FP128Ty) {
1165 // all long double variants are printed as hex
1166 // api needed to prevent premature destruction
1167 APInt api = CFP->getValueAPF().bitcastToAPInt();
1168 const uint64_t *p = api.getRawData();
1169 if (TD->isBigEndian()) {
1170 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1172 O << '\t' << TAI->getCommentString()
1173 << " long double most significant word";
1175 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1177 O << '\t' << TAI->getCommentString()
1178 << " long double next word";
1180 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1182 O << '\t' << TAI->getCommentString()
1183 << " long double next word";
1185 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1187 O << '\t' << TAI->getCommentString()
1188 << " long double least significant word";
1191 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1193 O << '\t' << TAI->getCommentString()
1194 << " long double least significant word";
1196 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1198 O << '\t' << TAI->getCommentString()
1199 << " long double next word";
1201 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1203 O << '\t' << TAI->getCommentString()
1204 << " long double next word";
1206 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1208 O << '\t' << TAI->getCommentString()
1209 << " long double most significant word";
1213 } else llvm_unreachable("Floating point constant type not handled");
1216 void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1217 unsigned AddrSpace) {
1218 const TargetData *TD = TM.getTargetData();
1219 unsigned BitWidth = CI->getBitWidth();
1220 assert(isPowerOf2_32(BitWidth) &&
1221 "Non-power-of-2-sized integers not handled!");
1223 // We don't expect assemblers to support integer data directives
1224 // for more than 64 bits, so we emit the data in at most 64-bit
1225 // quantities at a time.
1226 const uint64_t *RawData = CI->getValue().getRawData();
1227 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1229 if (TD->isBigEndian())
1230 Val = RawData[e - i - 1];
1234 if (TAI->getData64bitsDirective(AddrSpace))
1235 O << TAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1236 else if (TD->isBigEndian()) {
1237 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1239 O << '\t' << TAI->getCommentString()
1240 << " Double-word most significant word " << Val;
1242 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1244 O << '\t' << TAI->getCommentString()
1245 << " Double-word least significant word " << Val;
1248 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1250 O << '\t' << TAI->getCommentString()
1251 << " Double-word least significant word " << Val;
1253 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1255 O << '\t' << TAI->getCommentString()
1256 << " Double-word most significant word " << Val;
1262 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1263 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1264 const TargetData *TD = TM.getTargetData();
1265 const Type *type = CV->getType();
1266 unsigned Size = TD->getTypeAllocSize(type);
1268 if (CV->isNullValue() || isa<UndefValue>(CV)) {
1269 EmitZeros(Size, AddrSpace);
1271 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1272 EmitGlobalConstantArray(CVA , AddrSpace);
1274 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1275 EmitGlobalConstantStruct(CVS, AddrSpace);
1277 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1278 EmitGlobalConstantFP(CFP, AddrSpace);
1280 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1281 // Small integers are handled below; large integers are handled here.
1283 EmitGlobalConstantLargeInt(CI, AddrSpace);
1286 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1287 EmitGlobalConstantVector(CP);
1291 printDataDirective(type, AddrSpace);
1292 EmitConstantValueOnly(CV);
1294 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1296 CI->getValue().toStringUnsigned(S, 16);
1297 O << "\t\t\t" << TAI->getCommentString() << " 0x" << S.c_str();
1303 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1304 // Target doesn't support this yet!
1305 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1308 /// PrintSpecial - Print information related to the specified machine instr
1309 /// that is independent of the operand, and may be independent of the instr
1310 /// itself. This can be useful for portably encoding the comment character
1311 /// or other bits of target-specific knowledge into the asmstrings. The
1312 /// syntax used is ${:comment}. Targets can override this to add support
1313 /// for their own strange codes.
1314 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1315 if (!strcmp(Code, "private")) {
1316 O << TAI->getPrivateGlobalPrefix();
1317 } else if (!strcmp(Code, "comment")) {
1319 O << TAI->getCommentString();
1320 } else if (!strcmp(Code, "uid")) {
1321 // Comparing the address of MI isn't sufficient, because machineinstrs may
1322 // be allocated to the same address across functions.
1323 const Function *ThisF = MI->getParent()->getParent()->getFunction();
1325 // If this is a new LastFn instruction, bump the counter.
1326 if (LastMI != MI || LastFn != ThisF) {
1334 raw_string_ostream Msg(msg);
1335 Msg << "Unknown special formatter '" << Code
1336 << "' for machine instr: " << *MI;
1337 llvm_report_error(Msg.str());
1341 /// processDebugLoc - Processes the debug information of each machine
1342 /// instruction's DebugLoc.
1343 void AsmPrinter::processDebugLoc(DebugLoc DL) {
1344 if (TAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) {
1345 if (!DL.isUnknown()) {
1346 DebugLocTuple CurDLT = MF->getDebugLocTuple(DL);
1348 if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT)
1349 printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,
1350 DICompileUnit(CurDLT.CompileUnit)));
1357 /// printInlineAsm - This method formats and prints the specified machine
1358 /// instruction that is an inline asm.
1359 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1360 unsigned NumOperands = MI->getNumOperands();
1362 // Count the number of register definitions.
1363 unsigned NumDefs = 0;
1364 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1366 assert(NumDefs != NumOperands-1 && "No asm string?");
1368 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1370 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1371 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1373 // If this asmstr is empty, just print the #APP/#NOAPP markers.
1374 // These are useful to see where empty asm's wound up.
1375 if (AsmStr[0] == 0) {
1376 O << TAI->getInlineAsmStart() << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1380 O << TAI->getInlineAsmStart() << "\n\t";
1382 // The variant of the current asmprinter.
1383 int AsmPrinterVariant = TAI->getAssemblerDialect();
1385 int CurVariant = -1; // The number of the {.|.|.} region we are in.
1386 const char *LastEmitted = AsmStr; // One past the last character emitted.
1388 while (*LastEmitted) {
1389 switch (*LastEmitted) {
1391 // Not a special case, emit the string section literally.
1392 const char *LiteralEnd = LastEmitted+1;
1393 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1394 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1396 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1397 O.write(LastEmitted, LiteralEnd-LastEmitted);
1398 LastEmitted = LiteralEnd;
1402 ++LastEmitted; // Consume newline character.
1403 O << '\n'; // Indent code with newline.
1406 ++LastEmitted; // Consume '$' character.
1410 switch (*LastEmitted) {
1411 default: Done = false; break;
1412 case '$': // $$ -> $
1413 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1415 ++LastEmitted; // Consume second '$' character.
1417 case '(': // $( -> same as GCC's { character.
1418 ++LastEmitted; // Consume '(' character.
1419 if (CurVariant != -1) {
1420 llvm_report_error("Nested variants found in inline asm string: '"
1421 + std::string(AsmStr) + "'");
1423 CurVariant = 0; // We're in the first variant now.
1426 ++LastEmitted; // consume '|' character.
1427 if (CurVariant == -1)
1428 O << '|'; // this is gcc's behavior for | outside a variant
1430 ++CurVariant; // We're in the next variant.
1432 case ')': // $) -> same as GCC's } char.
1433 ++LastEmitted; // consume ')' character.
1434 if (CurVariant == -1)
1435 O << '}'; // this is gcc's behavior for } outside a variant
1442 bool HasCurlyBraces = false;
1443 if (*LastEmitted == '{') { // ${variable}
1444 ++LastEmitted; // Consume '{' character.
1445 HasCurlyBraces = true;
1448 // If we have ${:foo}, then this is not a real operand reference, it is a
1449 // "magic" string reference, just like in .td files. Arrange to call
1451 if (HasCurlyBraces && *LastEmitted == ':') {
1453 const char *StrStart = LastEmitted;
1454 const char *StrEnd = strchr(StrStart, '}');
1456 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1457 + std::string(AsmStr) + "'");
1460 std::string Val(StrStart, StrEnd);
1461 PrintSpecial(MI, Val.c_str());
1462 LastEmitted = StrEnd+1;
1466 const char *IDStart = LastEmitted;
1469 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1470 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1471 llvm_report_error("Bad $ operand number in inline asm string: '"
1472 + std::string(AsmStr) + "'");
1474 LastEmitted = IDEnd;
1476 char Modifier[2] = { 0, 0 };
1478 if (HasCurlyBraces) {
1479 // If we have curly braces, check for a modifier character. This
1480 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1481 if (*LastEmitted == ':') {
1482 ++LastEmitted; // Consume ':' character.
1483 if (*LastEmitted == 0) {
1484 llvm_report_error("Bad ${:} expression in inline asm string: '"
1485 + std::string(AsmStr) + "'");
1488 Modifier[0] = *LastEmitted;
1489 ++LastEmitted; // Consume modifier character.
1492 if (*LastEmitted != '}') {
1493 llvm_report_error("Bad ${} expression in inline asm string: '"
1494 + std::string(AsmStr) + "'");
1496 ++LastEmitted; // Consume '}' character.
1499 if ((unsigned)Val >= NumOperands-1) {
1500 llvm_report_error("Invalid $ operand number in inline asm string: '"
1501 + std::string(AsmStr) + "'");
1504 // Okay, we finally have a value number. Ask the target to print this
1506 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1511 // Scan to find the machine operand number for the operand.
1512 for (; Val; --Val) {
1513 if (OpNo >= MI->getNumOperands()) break;
1514 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1515 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1518 if (OpNo >= MI->getNumOperands()) {
1521 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1522 ++OpNo; // Skip over the ID number.
1524 if (Modifier[0]=='l') // labels are target independent
1525 printBasicBlockLabel(MI->getOperand(OpNo).getMBB(),
1526 false, false, false);
1528 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1529 if ((OpFlags & 7) == 4) {
1530 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1531 Modifier[0] ? Modifier : 0);
1533 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1534 Modifier[0] ? Modifier : 0);
1540 raw_string_ostream Msg(msg);
1541 Msg << "Invalid operand found in inline asm: '"
1544 llvm_report_error(Msg.str());
1551 O << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1554 /// printImplicitDef - This method prints the specified machine instruction
1555 /// that is an implicit def.
1556 void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1558 O << '\t' << TAI->getCommentString() << " implicit-def: "
1559 << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n';
1562 /// printLabel - This method prints a local label used by debug and
1563 /// exception handling tables.
1564 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1565 printLabel(MI->getOperand(0).getImm());
1568 void AsmPrinter::printLabel(unsigned Id) const {
1569 O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n";
1572 /// printDeclare - This method prints a local variable declaration used by
1574 /// FIXME: It doesn't really print anything rather it inserts a DebugVariable
1575 /// entry into dwarf table.
1576 void AsmPrinter::printDeclare(const MachineInstr *MI) const {
1577 unsigned FI = MI->getOperand(0).getIndex();
1578 GlobalValue *GV = MI->getOperand(1).getGlobal();
1579 DW->RecordVariable(cast<GlobalVariable>(GV), FI, MI);
1582 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1583 /// instruction, using the specified assembler variant. Targets should
1584 /// overried this to format as appropriate.
1585 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1586 unsigned AsmVariant, const char *ExtraCode) {
1587 // Target doesn't support this yet!
1591 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1592 unsigned AsmVariant,
1593 const char *ExtraCode) {
1594 // Target doesn't support this yet!
1598 /// printBasicBlockLabel - This method prints the label for the specified
1599 /// MachineBasicBlock
1600 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1603 bool printComment) const {
1605 unsigned Align = MBB->getAlignment();
1607 EmitAlignment(Log2_32(Align));
1610 O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_'
1611 << MBB->getNumber();
1614 if (printComment && MBB->getBasicBlock())
1615 O << '\t' << TAI->getCommentString() << ' '
1616 << MBB->getBasicBlock()->getNameStart();
1619 /// printPICJumpTableSetLabel - This method prints a set label for the
1620 /// specified MachineBasicBlock for a jumptable entry.
1621 void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1622 const MachineBasicBlock *MBB) const {
1623 if (!TAI->getSetDirective())
1626 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1627 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1628 printBasicBlockLabel(MBB, false, false, false);
1629 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1630 << '_' << uid << '\n';
1633 void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1634 const MachineBasicBlock *MBB) const {
1635 if (!TAI->getSetDirective())
1638 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1639 << getFunctionNumber() << '_' << uid << '_' << uid2
1640 << "_set_" << MBB->getNumber() << ',';
1641 printBasicBlockLabel(MBB, false, false, false);
1642 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1643 << '_' << uid << '_' << uid2 << '\n';
1646 /// printDataDirective - This method prints the asm directive for the
1648 void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1649 const TargetData *TD = TM.getTargetData();
1650 switch (type->getTypeID()) {
1651 case Type::IntegerTyID: {
1652 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1654 O << TAI->getData8bitsDirective(AddrSpace);
1655 else if (BitWidth <= 16)
1656 O << TAI->getData16bitsDirective(AddrSpace);
1657 else if (BitWidth <= 32)
1658 O << TAI->getData32bitsDirective(AddrSpace);
1659 else if (BitWidth <= 64) {
1660 assert(TAI->getData64bitsDirective(AddrSpace) &&
1661 "Target cannot handle 64-bit constant exprs!");
1662 O << TAI->getData64bitsDirective(AddrSpace);
1664 llvm_unreachable("Target cannot handle given data directive width!");
1668 case Type::PointerTyID:
1669 if (TD->getPointerSize() == 8) {
1670 assert(TAI->getData64bitsDirective(AddrSpace) &&
1671 "Target cannot handle 64-bit pointer exprs!");
1672 O << TAI->getData64bitsDirective(AddrSpace);
1673 } else if (TD->getPointerSize() == 2) {
1674 O << TAI->getData16bitsDirective(AddrSpace);
1675 } else if (TD->getPointerSize() == 1) {
1676 O << TAI->getData8bitsDirective(AddrSpace);
1678 O << TAI->getData32bitsDirective(AddrSpace);
1681 case Type::FloatTyID: case Type::DoubleTyID:
1682 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1683 assert (0 && "Should have already output floating point constant.");
1685 assert (0 && "Can't handle printing this type of thing");
1690 void AsmPrinter::printSuffixedName(const char *Name, const char *Suffix,
1691 const char *Prefix) {
1694 O << TAI->getPrivateGlobalPrefix();
1695 if (Prefix) O << Prefix;
1707 void AsmPrinter::printSuffixedName(const std::string &Name, const char* Suffix) {
1708 printSuffixedName(Name.c_str(), Suffix);
1711 void AsmPrinter::printVisibility(const std::string& Name,
1712 unsigned Visibility) const {
1713 if (Visibility == GlobalValue::HiddenVisibility) {
1714 if (const char *Directive = TAI->getHiddenDirective())
1715 O << Directive << Name << '\n';
1716 } else if (Visibility == GlobalValue::ProtectedVisibility) {
1717 if (const char *Directive = TAI->getProtectedDirective())
1718 O << Directive << Name << '\n';
1722 void AsmPrinter::printOffset(int64_t Offset) const {
1725 else if (Offset < 0)
1729 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1730 if (!S->usesMetadata())
1733 gcp_iterator GCPI = GCMetadataPrinters.find(S);
1734 if (GCPI != GCMetadataPrinters.end())
1735 return GCPI->second;
1737 const char *Name = S->getName().c_str();
1739 for (GCMetadataPrinterRegistry::iterator
1740 I = GCMetadataPrinterRegistry::begin(),
1741 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1742 if (strcmp(Name, I->getName()) == 0) {
1743 GCMetadataPrinter *GMP = I->instantiate();
1745 GCMetadataPrinters.insert(std::make_pair(S, GMP));
1749 cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1750 llvm_unreachable(0);
1753 /// EmitComments - Pretty-print comments for instructions
1754 void AsmPrinter::EmitComments(const MachineInstr &MI) const
1756 // No comments in MachineInstr yet
1759 /// EmitComments - Pretty-print comments for instructions
1760 void AsmPrinter::EmitComments(const MCInst &MI) const
1762 // No comments in MCInst yet