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/Support/CommandLine.h"
25 #include "llvm/Support/Mangler.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include "llvm/Target/TargetAsmInfo.h"
28 #include "llvm/Target/TargetData.h"
29 #include "llvm/Target/TargetLowering.h"
30 #include "llvm/Target/TargetMachine.h"
31 #include "llvm/Target/TargetOptions.h"
32 #include "llvm/Target/TargetRegisterInfo.h"
33 #include "llvm/ADT/SmallPtrSet.h"
34 #include "llvm/ADT/SmallString.h"
35 #include "llvm/ADT/StringExtras.h"
39 static cl::opt<cl::boolOrDefault>
40 AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
41 cl::init(cl::BOU_UNSET));
43 char AsmPrinter::ID = 0;
44 AsmPrinter::AsmPrinter(raw_ostream &o, TargetMachine &tm,
45 const TargetAsmInfo *T, bool F, bool VDef)
46 : MachineFunctionPass(&ID), FunctionNumber(0), Fast(F), O(o),
47 TM(tm), TAI(T), TRI(tm.getRegisterInfo()),
48 IsInTextSection(false)
51 case cl::BOU_UNSET: VerboseAsm = VDef; break;
52 case cl::BOU_TRUE: VerboseAsm = true; break;
53 case cl::BOU_FALSE: VerboseAsm = false; break;
57 AsmPrinter::~AsmPrinter() {
58 for (gcp_iterator I = GCMetadataPrinters.begin(),
59 E = GCMetadataPrinters.end(); I != E; ++I)
63 /// SwitchToTextSection - Switch to the specified text section of the executable
64 /// if we are not already in it!
66 void AsmPrinter::SwitchToTextSection(const char *NewSection,
67 const GlobalValue *GV) {
69 if (GV && GV->hasSection())
70 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
74 // If we're already in this section, we're done.
75 if (CurrentSection == NS) return;
77 // Close the current section, if applicable.
78 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
79 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
83 if (!CurrentSection.empty())
84 O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
86 IsInTextSection = true;
89 /// SwitchToDataSection - Switch to the specified data section of the executable
90 /// if we are not already in it!
92 void AsmPrinter::SwitchToDataSection(const char *NewSection,
93 const GlobalValue *GV) {
95 if (GV && GV->hasSection())
96 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
100 // If we're already in this section, we're done.
101 if (CurrentSection == NS) return;
103 // Close the current section, if applicable.
104 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
105 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
109 if (!CurrentSection.empty())
110 O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
112 IsInTextSection = false;
115 /// SwitchToSection - Switch to the specified section of the executable if we
116 /// are not already in it!
117 void AsmPrinter::SwitchToSection(const Section* NS) {
118 const std::string& NewSection = NS->getName();
120 // If we're already in this section, we're done.
121 if (CurrentSection == NewSection) return;
123 // Close the current section, if applicable.
124 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
125 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
127 // FIXME: Make CurrentSection a Section* in the future
128 CurrentSection = NewSection;
129 CurrentSection_ = NS;
131 if (!CurrentSection.empty()) {
132 // If section is named we need to switch into it via special '.section'
133 // directive and also append funky flags. Otherwise - section name is just
134 // some magic assembler directive.
136 O << TAI->getSwitchToSectionDirective()
138 << TAI->getSectionFlags(NS->getFlags());
141 O << TAI->getDataSectionStartSuffix() << '\n';
144 IsInTextSection = (NS->getFlags() & SectionFlags::Code);
147 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
148 MachineFunctionPass::getAnalysisUsage(AU);
149 AU.addRequired<GCModuleInfo>();
152 bool AsmPrinter::doInitialization(Module &M) {
153 Mang = new Mangler(M, TAI->getGlobalPrefix(), TAI->getPrivateGlobalPrefix());
155 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
156 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
158 if (TAI->hasSingleParameterDotFile()) {
159 /* Very minimal debug info. It is ignored if we emit actual
160 debug info. If we don't, this at helps the user find where
161 a function came from. */
162 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
165 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
166 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
167 MP->beginAssembly(O, *this, *TAI);
169 if (!M.getModuleInlineAsm().empty())
170 O << TAI->getCommentString() << " Start of file scope inline assembly\n"
171 << M.getModuleInlineAsm()
172 << '\n' << TAI->getCommentString()
173 << " End of file scope inline assembly\n";
175 SwitchToDataSection(""); // Reset back to no section.
177 MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
178 if (MMI) MMI->AnalyzeModule(M);
179 DW = getAnalysisIfAvailable<DwarfWriter>();
183 bool AsmPrinter::doFinalization(Module &M) {
184 if (TAI->getWeakRefDirective()) {
185 if (!ExtWeakSymbols.empty())
186 SwitchToDataSection("");
188 for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(),
189 e = ExtWeakSymbols.end(); i != e; ++i)
190 O << TAI->getWeakRefDirective() << Mang->getValueName(*i) << '\n';
193 if (TAI->getSetDirective()) {
194 if (!M.alias_empty())
195 SwitchToSection(TAI->getTextSection());
198 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
200 std::string Name = Mang->getValueName(I);
203 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
204 Target = Mang->getValueName(GV);
206 if (I->hasExternalLinkage() || !TAI->getWeakRefDirective())
207 O << "\t.globl\t" << Name << '\n';
208 else if (I->hasWeakLinkage())
209 O << TAI->getWeakRefDirective() << Name << '\n';
210 else if (!I->hasLocalLinkage())
211 assert(0 && "Invalid alias linkage");
213 printVisibility(Name, I->getVisibility());
215 O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n';
219 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
220 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
221 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
222 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
223 MP->finishAssembly(O, *this, *TAI);
225 // If we don't have any trampolines, then we don't require stack memory
226 // to be executable. Some targets have a directive to declare this.
227 Function* InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
228 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
229 if (TAI->getNonexecutableStackDirective())
230 O << TAI->getNonexecutableStackDirective() << '\n';
232 delete Mang; Mang = 0;
237 AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF,
238 std::string &Name) const {
239 assert(MF && "No machine function?");
240 Name = MF->getFunction()->getName();
242 Name = Mang->getValueName(MF->getFunction());
243 Name = Mang->makeNameProper(TAI->getEHGlobalPrefix() +
244 Name + ".eh", TAI->getGlobalPrefix());
248 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
249 // What's my mangled name?
250 CurrentFnName = Mang->getValueName(MF.getFunction());
251 IncrementFunctionNumber();
255 // SectionCPs - Keep track the alignment, constpool entries per Section.
259 SmallVector<unsigned, 4> CPEs;
260 SectionCPs(const Section *s, unsigned a) : S(s), Alignment(a) {};
264 /// EmitConstantPool - Print to the current output stream assembly
265 /// representations of the constants in the constant pool MCP. This is
266 /// used to print out constants which have been "spilled to memory" by
267 /// the code generator.
269 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
270 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
271 if (CP.empty()) return;
273 // Calculate sections for constant pool entries. We collect entries to go into
274 // the same section together to reduce amount of section switch statements.
275 SmallVector<SectionCPs, 4> CPSections;
276 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
277 MachineConstantPoolEntry CPE = CP[i];
278 unsigned Align = CPE.getAlignment();
279 const Section* S = TAI->SelectSectionForMachineConst(CPE.getType());
280 // The number of sections are small, just do a linear search from the
281 // last section to the first.
283 unsigned SecIdx = CPSections.size();
284 while (SecIdx != 0) {
285 if (CPSections[--SecIdx].S == S) {
291 SecIdx = CPSections.size();
292 CPSections.push_back(SectionCPs(S, Align));
295 if (Align > CPSections[SecIdx].Alignment)
296 CPSections[SecIdx].Alignment = Align;
297 CPSections[SecIdx].CPEs.push_back(i);
300 // Now print stuff into the calculated sections.
301 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
302 SwitchToSection(CPSections[i].S);
303 EmitAlignment(Log2_32(CPSections[i].Alignment));
306 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
307 unsigned CPI = CPSections[i].CPEs[j];
308 MachineConstantPoolEntry CPE = CP[CPI];
310 // Emit inter-object padding for alignment.
311 unsigned AlignMask = CPE.getAlignment() - 1;
312 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
313 EmitZeros(NewOffset - Offset);
315 const Type *Ty = CPE.getType();
316 Offset = NewOffset + TM.getTargetData()->getTypePaddedSize(Ty);
318 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
319 << CPI << ":\t\t\t\t\t";
321 O << TAI->getCommentString() << ' ';
322 WriteTypeSymbolic(O, CPE.getType(), 0);
325 if (CPE.isMachineConstantPoolEntry())
326 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
328 EmitGlobalConstant(CPE.Val.ConstVal);
333 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
334 /// by the current function to the current output stream.
336 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
337 MachineFunction &MF) {
338 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
339 if (JT.empty()) return;
341 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
343 // Pick the directive to use to print the jump table entries, and switch to
344 // the appropriate section.
345 TargetLowering *LoweringInfo = TM.getTargetLowering();
347 const char* JumpTableDataSection = TAI->getJumpTableDataSection();
348 const Function *F = MF.getFunction();
349 unsigned SectionFlags = TAI->SectionFlagsForGlobal(F);
350 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
351 !JumpTableDataSection ||
352 SectionFlags & SectionFlags::Linkonce) {
353 // In PIC mode, we need to emit the jump table to the same section as the
354 // function body itself, otherwise the label differences won't make sense.
355 // We should also do if the section name is NULL or function is declared in
356 // discardable section.
357 SwitchToSection(TAI->SectionForGlobal(F));
359 SwitchToDataSection(JumpTableDataSection);
362 EmitAlignment(Log2_32(MJTI->getAlignment()));
364 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
365 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
367 // If this jump table was deleted, ignore it.
368 if (JTBBs.empty()) continue;
370 // For PIC codegen, if possible we want to use the SetDirective to reduce
371 // the number of relocations the assembler will generate for the jump table.
372 // Set directives are all printed before the jump table itself.
373 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
374 if (TAI->getSetDirective() && IsPic)
375 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
376 if (EmittedSets.insert(JTBBs[ii]))
377 printPICJumpTableSetLabel(i, JTBBs[ii]);
379 // On some targets (e.g. darwin) we want to emit two consequtive labels
380 // before each jump table. The first label is never referenced, but tells
381 // the assembler and linker the extents of the jump table object. The
382 // second label is actually referenced by the code.
383 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
384 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
386 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
387 << '_' << i << ":\n";
389 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
390 printPICJumpTableEntry(MJTI, JTBBs[ii], i);
396 void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
397 const MachineBasicBlock *MBB,
398 unsigned uid) const {
399 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
401 // Use JumpTableDirective otherwise honor the entry size from the jump table
403 const char *JTEntryDirective = TAI->getJumpTableDirective();
404 bool HadJTEntryDirective = JTEntryDirective != NULL;
405 if (!HadJTEntryDirective) {
406 JTEntryDirective = MJTI->getEntrySize() == 4 ?
407 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
410 O << JTEntryDirective << ' ';
412 // If we have emitted set directives for the jump table entries, print
413 // them rather than the entries themselves. If we're emitting PIC, then
414 // emit the table entries as differences between two text section labels.
415 // If we're emitting non-PIC code, then emit the entries as direct
416 // references to the target basic blocks.
418 if (TAI->getSetDirective()) {
419 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
420 << '_' << uid << "_set_" << MBB->getNumber();
422 printBasicBlockLabel(MBB, false, false, false);
423 // If the arch uses custom Jump Table directives, don't calc relative to
425 if (!HadJTEntryDirective)
426 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
427 << getFunctionNumber() << '_' << uid;
430 printBasicBlockLabel(MBB, false, false, false);
435 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
436 /// special global used by LLVM. If so, emit it and return true, otherwise
437 /// do nothing and return false.
438 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
439 if (GV->getName() == "llvm.used") {
440 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
441 EmitLLVMUsedList(GV->getInitializer());
445 // Ignore debug and non-emitted data.
446 if (GV->getSection() == "llvm.metadata" ||
447 GV->hasAvailableExternallyLinkage())
450 if (!GV->hasAppendingLinkage()) return false;
452 assert(GV->hasInitializer() && "Not a special LLVM global!");
454 const TargetData *TD = TM.getTargetData();
455 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
456 if (GV->getName() == "llvm.global_ctors") {
457 SwitchToDataSection(TAI->getStaticCtorsSection());
458 EmitAlignment(Align, 0);
459 EmitXXStructorList(GV->getInitializer());
463 if (GV->getName() == "llvm.global_dtors") {
464 SwitchToDataSection(TAI->getStaticDtorsSection());
465 EmitAlignment(Align, 0);
466 EmitXXStructorList(GV->getInitializer());
473 /// findGlobalValue - if CV is an expression equivalent to a single
474 /// global value, return that value.
475 const GlobalValue * AsmPrinter::findGlobalValue(const Constant *CV) {
476 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
478 else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
479 const TargetData *TD = TM.getTargetData();
480 unsigned Opcode = CE->getOpcode();
482 case Instruction::GetElementPtr: {
483 const Constant *ptrVal = CE->getOperand(0);
484 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
485 if (TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], idxVec.size()))
487 return findGlobalValue(ptrVal);
489 case Instruction::BitCast:
490 return findGlobalValue(CE->getOperand(0));
498 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
499 /// global in the specified llvm.used list for which emitUsedDirectiveFor
500 /// is true, as being used with this directive.
502 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
503 const char *Directive = TAI->getUsedDirective();
505 // Should be an array of 'sbyte*'.
506 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
507 if (InitList == 0) return;
509 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
510 const GlobalValue *GV = findGlobalValue(InitList->getOperand(i));
511 if (TAI->emitUsedDirectiveFor(GV, Mang)) {
513 EmitConstantValueOnly(InitList->getOperand(i));
519 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
520 /// function pointers, ignoring the init priority.
521 void AsmPrinter::EmitXXStructorList(Constant *List) {
522 // Should be an array of '{ int, void ()* }' structs. The first value is the
523 // init priority, which we ignore.
524 if (!isa<ConstantArray>(List)) return;
525 ConstantArray *InitList = cast<ConstantArray>(List);
526 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
527 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
528 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
530 if (CS->getOperand(1)->isNullValue())
531 return; // Found a null terminator, exit printing.
532 // Emit the function pointer.
533 EmitGlobalConstant(CS->getOperand(1));
537 /// getGlobalLinkName - Returns the asm/link name of of the specified
538 /// global variable. Should be overridden by each target asm printer to
539 /// generate the appropriate value.
540 const std::string &AsmPrinter::getGlobalLinkName(const GlobalVariable *GV,
541 std::string &LinkName) const {
542 if (isa<Function>(GV)) {
543 LinkName += TAI->getFunctionAddrPrefix();
544 LinkName += Mang->getValueName(GV);
545 LinkName += TAI->getFunctionAddrSuffix();
547 LinkName += TAI->getGlobalVarAddrPrefix();
548 LinkName += Mang->getValueName(GV);
549 LinkName += TAI->getGlobalVarAddrSuffix();
555 /// EmitExternalGlobal - Emit the external reference to a global variable.
556 /// Should be overridden if an indirect reference should be used.
557 void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
559 O << getGlobalLinkName(GV, GLN);
564 //===----------------------------------------------------------------------===//
565 /// LEB 128 number encoding.
567 /// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
568 /// representing an unsigned leb128 value.
569 void AsmPrinter::PrintULEB128(unsigned Value) const {
572 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
574 if (Value) Byte |= 0x80;
575 O << "0x" << utohex_buffer(Byte, Buffer+20);
576 if (Value) O << ", ";
580 /// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
581 /// representing a signed leb128 value.
582 void AsmPrinter::PrintSLEB128(int Value) const {
583 int Sign = Value >> (8 * sizeof(Value) - 1);
588 unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
590 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
591 if (IsMore) Byte |= 0x80;
592 O << "0x" << utohex_buffer(Byte, Buffer+20);
593 if (IsMore) O << ", ";
597 //===--------------------------------------------------------------------===//
598 // Emission and print routines
601 /// PrintHex - Print a value as a hexidecimal value.
603 void AsmPrinter::PrintHex(int Value) const {
605 O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20);
608 /// EOL - Print a newline character to asm stream. If a comment is present
609 /// then it will be printed first. Comments should not contain '\n'.
610 void AsmPrinter::EOL() const {
614 void AsmPrinter::EOL(const std::string &Comment) const {
615 if (VerboseAsm && !Comment.empty()) {
617 << TAI->getCommentString()
624 void AsmPrinter::EOL(const char* Comment) const {
625 if (VerboseAsm && *Comment) {
627 << TAI->getCommentString()
634 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
635 /// unsigned leb128 value.
636 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
637 if (TAI->hasLEB128()) {
641 O << TAI->getData8bitsDirective();
646 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
647 /// signed leb128 value.
648 void AsmPrinter::EmitSLEB128Bytes(int Value) const {
649 if (TAI->hasLEB128()) {
653 O << TAI->getData8bitsDirective();
658 /// EmitInt8 - Emit a byte directive and value.
660 void AsmPrinter::EmitInt8(int Value) const {
661 O << TAI->getData8bitsDirective();
662 PrintHex(Value & 0xFF);
665 /// EmitInt16 - Emit a short directive and value.
667 void AsmPrinter::EmitInt16(int Value) const {
668 O << TAI->getData16bitsDirective();
669 PrintHex(Value & 0xFFFF);
672 /// EmitInt32 - Emit a long directive and value.
674 void AsmPrinter::EmitInt32(int Value) const {
675 O << TAI->getData32bitsDirective();
679 /// EmitInt64 - Emit a long long directive and value.
681 void AsmPrinter::EmitInt64(uint64_t Value) const {
682 if (TAI->getData64bitsDirective()) {
683 O << TAI->getData64bitsDirective();
686 if (TM.getTargetData()->isBigEndian()) {
687 EmitInt32(unsigned(Value >> 32)); O << '\n';
688 EmitInt32(unsigned(Value));
690 EmitInt32(unsigned(Value)); O << '\n';
691 EmitInt32(unsigned(Value >> 32));
696 /// toOctal - Convert the low order bits of X into an octal digit.
698 static inline char toOctal(int X) {
702 /// printStringChar - Print a char, escaped if necessary.
704 static void printStringChar(raw_ostream &O, unsigned char C) {
707 } else if (C == '\\') {
709 } else if (isprint((unsigned char)C)) {
713 case '\b': O << "\\b"; break;
714 case '\f': O << "\\f"; break;
715 case '\n': O << "\\n"; break;
716 case '\r': O << "\\r"; break;
717 case '\t': O << "\\t"; break;
720 O << toOctal(C >> 6);
721 O << toOctal(C >> 3);
722 O << toOctal(C >> 0);
728 /// EmitString - Emit a string with quotes and a null terminator.
729 /// Special characters are emitted properly.
730 /// \literal (Eg. '\t') \endliteral
731 void AsmPrinter::EmitString(const std::string &String) const {
732 EmitString(String.c_str(), String.size());
735 void AsmPrinter::EmitString(const char *String, unsigned Size) const {
736 const char* AscizDirective = TAI->getAscizDirective();
740 O << TAI->getAsciiDirective();
742 for (unsigned i = 0; i < Size; ++i)
743 printStringChar(O, String[i]);
751 /// EmitFile - Emit a .file directive.
752 void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
753 O << "\t.file\t" << Number << " \"";
754 for (unsigned i = 0, N = Name.size(); i < N; ++i)
755 printStringChar(O, Name[i]);
760 //===----------------------------------------------------------------------===//
762 // EmitAlignment - Emit an alignment directive to the specified power of
763 // two boundary. For example, if you pass in 3 here, you will get an 8
764 // byte alignment. If a global value is specified, and if that global has
765 // an explicit alignment requested, it will unconditionally override the
766 // alignment request. However, if ForcedAlignBits is specified, this value
767 // has final say: the ultimate alignment will be the max of ForcedAlignBits
768 // and the alignment computed with NumBits and the global.
772 // if (GV && GV->hasalignment) Align = GV->getalignment();
773 // Align = std::max(Align, ForcedAlignBits);
775 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
776 unsigned ForcedAlignBits,
777 bool UseFillExpr) const {
778 if (GV && GV->getAlignment())
779 NumBits = Log2_32(GV->getAlignment());
780 NumBits = std::max(NumBits, ForcedAlignBits);
782 if (NumBits == 0) return; // No need to emit alignment.
783 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
784 O << TAI->getAlignDirective() << NumBits;
786 unsigned FillValue = TAI->getTextAlignFillValue();
787 UseFillExpr &= IsInTextSection && FillValue;
796 /// EmitZeros - Emit a block of zeros.
798 void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
800 if (TAI->getZeroDirective()) {
801 O << TAI->getZeroDirective() << NumZeros;
802 if (TAI->getZeroDirectiveSuffix())
803 O << TAI->getZeroDirectiveSuffix();
806 for (; NumZeros; --NumZeros)
807 O << TAI->getData8bitsDirective(AddrSpace) << "0\n";
812 // Print out the specified constant, without a storage class. Only the
813 // constants valid in constant expressions can occur here.
814 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
815 if (CV->isNullValue() || isa<UndefValue>(CV))
817 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
818 O << CI->getZExtValue();
819 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
820 // This is a constant address for a global variable or function. Use the
821 // name of the variable or function as the address value, possibly
822 // decorating it with GlobalVarAddrPrefix/Suffix or
823 // FunctionAddrPrefix/Suffix (these all default to "" )
824 if (isa<Function>(GV)) {
825 O << TAI->getFunctionAddrPrefix()
826 << Mang->getValueName(GV)
827 << TAI->getFunctionAddrSuffix();
829 O << TAI->getGlobalVarAddrPrefix()
830 << Mang->getValueName(GV)
831 << TAI->getGlobalVarAddrSuffix();
833 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
834 const TargetData *TD = TM.getTargetData();
835 unsigned Opcode = CE->getOpcode();
837 case Instruction::GetElementPtr: {
838 // generate a symbolic expression for the byte address
839 const Constant *ptrVal = CE->getOperand(0);
840 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
841 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
843 // Truncate/sext the offset to the pointer size.
844 if (TD->getPointerSizeInBits() != 64) {
845 int SExtAmount = 64-TD->getPointerSizeInBits();
846 Offset = (Offset << SExtAmount) >> SExtAmount;
851 EmitConstantValueOnly(ptrVal);
853 O << ") + " << Offset;
855 O << ") - " << -Offset;
857 EmitConstantValueOnly(ptrVal);
861 case Instruction::Trunc:
862 case Instruction::ZExt:
863 case Instruction::SExt:
864 case Instruction::FPTrunc:
865 case Instruction::FPExt:
866 case Instruction::UIToFP:
867 case Instruction::SIToFP:
868 case Instruction::FPToUI:
869 case Instruction::FPToSI:
870 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
872 case Instruction::BitCast:
873 return EmitConstantValueOnly(CE->getOperand(0));
875 case Instruction::IntToPtr: {
876 // Handle casts to pointers by changing them into casts to the appropriate
877 // integer type. This promotes constant folding and simplifies this code.
878 Constant *Op = CE->getOperand(0);
879 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
880 return EmitConstantValueOnly(Op);
884 case Instruction::PtrToInt: {
885 // Support only foldable casts to/from pointers that can be eliminated by
886 // changing the pointer to the appropriately sized integer type.
887 Constant *Op = CE->getOperand(0);
888 const Type *Ty = CE->getType();
890 // We can emit the pointer value into this slot if the slot is an
891 // integer slot greater or equal to the size of the pointer.
892 if (TD->getTypePaddedSize(Ty) >= TD->getTypePaddedSize(Op->getType()))
893 return EmitConstantValueOnly(Op);
896 EmitConstantValueOnly(Op);
897 APInt ptrMask = APInt::getAllOnesValue(TD->getTypePaddedSizeInBits(Ty));
900 ptrMask.toStringUnsigned(S);
901 O << ") & " << S.c_str() << ')';
904 case Instruction::Add:
905 case Instruction::Sub:
906 case Instruction::And:
907 case Instruction::Or:
908 case Instruction::Xor:
910 EmitConstantValueOnly(CE->getOperand(0));
913 case Instruction::Add:
916 case Instruction::Sub:
919 case Instruction::And:
922 case Instruction::Or:
925 case Instruction::Xor:
932 EmitConstantValueOnly(CE->getOperand(1));
936 assert(0 && "Unsupported operator!");
939 assert(0 && "Unknown constant value!");
943 /// printAsCString - Print the specified array as a C compatible string, only if
944 /// the predicate isString is true.
946 static void printAsCString(raw_ostream &O, const ConstantArray *CVA,
948 assert(CVA->isString() && "Array is not string compatible!");
951 for (unsigned i = 0; i != LastElt; ++i) {
953 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
954 printStringChar(O, C);
959 /// EmitString - Emit a zero-byte-terminated string constant.
961 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
962 unsigned NumElts = CVA->getNumOperands();
963 if (TAI->getAscizDirective() && NumElts &&
964 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
965 O << TAI->getAscizDirective();
966 printAsCString(O, CVA, NumElts-1);
968 O << TAI->getAsciiDirective();
969 printAsCString(O, CVA, NumElts);
974 void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA) {
975 if (CVA->isString()) {
977 } else { // Not a string. Print the values in successive locations
978 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
979 EmitGlobalConstant(CVA->getOperand(i));
983 void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
984 const VectorType *PTy = CP->getType();
986 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
987 EmitGlobalConstant(CP->getOperand(I));
990 void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
991 unsigned AddrSpace) {
992 // Print the fields in successive locations. Pad to align if needed!
993 const TargetData *TD = TM.getTargetData();
994 unsigned Size = TD->getTypePaddedSize(CVS->getType());
995 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
996 uint64_t sizeSoFar = 0;
997 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
998 const Constant* field = CVS->getOperand(i);
1000 // Check if padding is needed and insert one or more 0s.
1001 uint64_t fieldSize = TD->getTypePaddedSize(field->getType());
1002 uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
1003 - cvsLayout->getElementOffset(i)) - fieldSize;
1004 sizeSoFar += fieldSize + padSize;
1006 // Now print the actual field value.
1007 EmitGlobalConstant(field, AddrSpace);
1009 // Insert padding - this may include padding to increase the size of the
1010 // current field up to the ABI size (if the struct is not packed) as well
1011 // as padding to ensure that the next field starts at the right offset.
1012 EmitZeros(padSize, AddrSpace);
1014 assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
1015 "Layout of constant struct may be incorrect!");
1018 void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1019 unsigned AddrSpace) {
1020 // FP Constants are printed as integer constants to avoid losing
1022 const TargetData *TD = TM.getTargetData();
1023 if (CFP->getType() == Type::DoubleTy) {
1024 double Val = CFP->getValueAPF().convertToDouble(); // for comment only
1025 uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1026 if (TAI->getData64bitsDirective(AddrSpace)) {
1027 O << TAI->getData64bitsDirective(AddrSpace) << i;
1029 O << '\t' << TAI->getCommentString() << " double value: " << Val;
1031 } else if (TD->isBigEndian()) {
1032 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1034 O << '\t' << TAI->getCommentString()
1035 << " double most significant word " << Val;
1037 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1039 O << '\t' << TAI->getCommentString()
1040 << " double least significant word " << Val;
1043 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1045 O << '\t' << TAI->getCommentString()
1046 << " double least significant word " << Val;
1048 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1050 O << '\t' << TAI->getCommentString()
1051 << " double most significant word " << Val;
1055 } else if (CFP->getType() == Type::FloatTy) {
1056 float Val = CFP->getValueAPF().convertToFloat(); // for comment only
1057 O << TAI->getData32bitsDirective(AddrSpace)
1058 << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1060 O << '\t' << TAI->getCommentString() << " float " << Val;
1063 } else if (CFP->getType() == Type::X86_FP80Ty) {
1064 // all long double variants are printed as hex
1065 // api needed to prevent premature destruction
1066 APInt api = CFP->getValueAPF().bitcastToAPInt();
1067 const uint64_t *p = api.getRawData();
1068 // Convert to double so we can print the approximate val as a comment.
1069 APFloat DoubleVal = CFP->getValueAPF();
1071 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1073 if (TD->isBigEndian()) {
1074 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1076 O << '\t' << TAI->getCommentString()
1077 << " long double most significant halfword of ~"
1078 << DoubleVal.convertToDouble();
1080 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1082 O << '\t' << TAI->getCommentString() << " long double next halfword";
1084 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1086 O << '\t' << TAI->getCommentString() << " long double next halfword";
1088 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1090 O << '\t' << TAI->getCommentString() << " long double next halfword";
1092 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1094 O << '\t' << TAI->getCommentString()
1095 << " long double least significant halfword";
1098 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1100 O << '\t' << TAI->getCommentString()
1101 << " long double least significant halfword of ~"
1102 << DoubleVal.convertToDouble();
1104 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1106 O << '\t' << TAI->getCommentString()
1107 << " long double next halfword";
1109 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1111 O << '\t' << TAI->getCommentString()
1112 << " long double next halfword";
1114 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1116 O << '\t' << TAI->getCommentString()
1117 << " long double next halfword";
1119 O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1121 O << '\t' << TAI->getCommentString()
1122 << " long double most significant halfword";
1125 EmitZeros(TD->getTypePaddedSize(Type::X86_FP80Ty) -
1126 TD->getTypeStoreSize(Type::X86_FP80Ty), AddrSpace);
1128 } else if (CFP->getType() == Type::PPC_FP128Ty) {
1129 // all long double variants are printed as hex
1130 // api needed to prevent premature destruction
1131 APInt api = CFP->getValueAPF().bitcastToAPInt();
1132 const uint64_t *p = api.getRawData();
1133 if (TD->isBigEndian()) {
1134 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1136 O << '\t' << TAI->getCommentString()
1137 << " long double most significant word";
1139 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1141 O << '\t' << TAI->getCommentString()
1142 << " long double next word";
1144 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1146 O << '\t' << TAI->getCommentString()
1147 << " long double next word";
1149 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1151 O << '\t' << TAI->getCommentString()
1152 << " long double least significant word";
1155 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1157 O << '\t' << TAI->getCommentString()
1158 << " long double least significant word";
1160 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1162 O << '\t' << TAI->getCommentString()
1163 << " long double next word";
1165 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1167 O << '\t' << TAI->getCommentString()
1168 << " long double next word";
1170 O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1172 O << '\t' << TAI->getCommentString()
1173 << " long double most significant word";
1177 } else assert(0 && "Floating point constant type not handled");
1180 void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1181 unsigned AddrSpace) {
1182 const TargetData *TD = TM.getTargetData();
1183 unsigned BitWidth = CI->getBitWidth();
1184 assert(isPowerOf2_32(BitWidth) &&
1185 "Non-power-of-2-sized integers not handled!");
1187 // We don't expect assemblers to support integer data directives
1188 // for more than 64 bits, so we emit the data in at most 64-bit
1189 // quantities at a time.
1190 const uint64_t *RawData = CI->getValue().getRawData();
1191 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1193 if (TD->isBigEndian())
1194 Val = RawData[e - i - 1];
1198 if (TAI->getData64bitsDirective(AddrSpace))
1199 O << TAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1200 else if (TD->isBigEndian()) {
1201 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1203 O << '\t' << TAI->getCommentString()
1204 << " Double-word most significant word " << Val;
1206 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1208 O << '\t' << TAI->getCommentString()
1209 << " Double-word least significant word " << Val;
1212 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1214 O << '\t' << TAI->getCommentString()
1215 << " Double-word least significant word " << Val;
1217 O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1219 O << '\t' << TAI->getCommentString()
1220 << " Double-word most significant word " << Val;
1226 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1227 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1228 const TargetData *TD = TM.getTargetData();
1229 const Type *type = CV->getType();
1230 unsigned Size = TD->getTypePaddedSize(type);
1232 if (CV->isNullValue() || isa<UndefValue>(CV)) {
1233 EmitZeros(Size, AddrSpace);
1235 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1236 EmitGlobalConstantArray(CVA);
1238 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1239 EmitGlobalConstantStruct(CVS, AddrSpace);
1241 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1242 EmitGlobalConstantFP(CFP, AddrSpace);
1244 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1245 // Small integers are handled below; large integers are handled here.
1247 EmitGlobalConstantLargeInt(CI, AddrSpace);
1250 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1251 EmitGlobalConstantVector(CP);
1255 printDataDirective(type, AddrSpace);
1256 EmitConstantValueOnly(CV);
1258 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1260 CI->getValue().toStringUnsigned(S, 16);
1261 O << "\t\t\t" << TAI->getCommentString() << " 0x" << S.c_str();
1267 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1268 // Target doesn't support this yet!
1272 /// PrintSpecial - Print information related to the specified machine instr
1273 /// that is independent of the operand, and may be independent of the instr
1274 /// itself. This can be useful for portably encoding the comment character
1275 /// or other bits of target-specific knowledge into the asmstrings. The
1276 /// syntax used is ${:comment}. Targets can override this to add support
1277 /// for their own strange codes.
1278 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1279 if (!strcmp(Code, "private")) {
1280 O << TAI->getPrivateGlobalPrefix();
1281 } else if (!strcmp(Code, "comment")) {
1283 O << TAI->getCommentString();
1284 } else if (!strcmp(Code, "uid")) {
1285 // Assign a unique ID to this machine instruction.
1286 static const MachineInstr *LastMI = 0;
1287 static const Function *F = 0;
1288 static unsigned Counter = 0U-1;
1290 // Comparing the address of MI isn't sufficient, because machineinstrs may
1291 // be allocated to the same address across functions.
1292 const Function *ThisF = MI->getParent()->getParent()->getFunction();
1294 // If this is a new machine instruction, bump the counter.
1295 if (LastMI != MI || F != ThisF) {
1302 cerr << "Unknown special formatter '" << Code
1303 << "' for machine instr: " << *MI;
1309 /// printInlineAsm - This method formats and prints the specified machine
1310 /// instruction that is an inline asm.
1311 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1312 unsigned NumOperands = MI->getNumOperands();
1314 // Count the number of register definitions.
1315 unsigned NumDefs = 0;
1316 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1318 assert(NumDefs != NumOperands-1 && "No asm string?");
1320 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1322 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1323 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1325 // If this asmstr is empty, just print the #APP/#NOAPP markers.
1326 // These are useful to see where empty asm's wound up.
1327 if (AsmStr[0] == 0) {
1328 O << TAI->getInlineAsmStart() << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1332 O << TAI->getInlineAsmStart() << "\n\t";
1334 // The variant of the current asmprinter.
1335 int AsmPrinterVariant = TAI->getAssemblerDialect();
1337 int CurVariant = -1; // The number of the {.|.|.} region we are in.
1338 const char *LastEmitted = AsmStr; // One past the last character emitted.
1340 while (*LastEmitted) {
1341 switch (*LastEmitted) {
1343 // Not a special case, emit the string section literally.
1344 const char *LiteralEnd = LastEmitted+1;
1345 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1346 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1348 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1349 O.write(LastEmitted, LiteralEnd-LastEmitted);
1350 LastEmitted = LiteralEnd;
1354 ++LastEmitted; // Consume newline character.
1355 O << '\n'; // Indent code with newline.
1358 ++LastEmitted; // Consume '$' character.
1362 switch (*LastEmitted) {
1363 default: Done = false; break;
1364 case '$': // $$ -> $
1365 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1367 ++LastEmitted; // Consume second '$' character.
1369 case '(': // $( -> same as GCC's { character.
1370 ++LastEmitted; // Consume '(' character.
1371 if (CurVariant != -1) {
1372 cerr << "Nested variants found in inline asm string: '"
1376 CurVariant = 0; // We're in the first variant now.
1379 ++LastEmitted; // consume '|' character.
1380 if (CurVariant == -1)
1381 O << '|'; // this is gcc's behavior for | outside a variant
1383 ++CurVariant; // We're in the next variant.
1385 case ')': // $) -> same as GCC's } char.
1386 ++LastEmitted; // consume ')' character.
1387 if (CurVariant == -1)
1388 O << '}'; // this is gcc's behavior for } outside a variant
1395 bool HasCurlyBraces = false;
1396 if (*LastEmitted == '{') { // ${variable}
1397 ++LastEmitted; // Consume '{' character.
1398 HasCurlyBraces = true;
1401 // If we have ${:foo}, then this is not a real operand reference, it is a
1402 // "magic" string reference, just like in .td files. Arrange to call
1404 if (HasCurlyBraces && *LastEmitted == ':') {
1406 const char *StrStart = LastEmitted;
1407 const char *StrEnd = strchr(StrStart, '}');
1409 cerr << "Unterminated ${:foo} operand in inline asm string: '"
1414 std::string Val(StrStart, StrEnd);
1415 PrintSpecial(MI, Val.c_str());
1416 LastEmitted = StrEnd+1;
1420 const char *IDStart = LastEmitted;
1423 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1424 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1425 cerr << "Bad $ operand number in inline asm string: '"
1429 LastEmitted = IDEnd;
1431 char Modifier[2] = { 0, 0 };
1433 if (HasCurlyBraces) {
1434 // If we have curly braces, check for a modifier character. This
1435 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1436 if (*LastEmitted == ':') {
1437 ++LastEmitted; // Consume ':' character.
1438 if (*LastEmitted == 0) {
1439 cerr << "Bad ${:} expression in inline asm string: '"
1444 Modifier[0] = *LastEmitted;
1445 ++LastEmitted; // Consume modifier character.
1448 if (*LastEmitted != '}') {
1449 cerr << "Bad ${} expression in inline asm string: '"
1453 ++LastEmitted; // Consume '}' character.
1456 if ((unsigned)Val >= NumOperands-1) {
1457 cerr << "Invalid $ operand number in inline asm string: '"
1462 // Okay, we finally have a value number. Ask the target to print this
1464 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1469 // Scan to find the machine operand number for the operand.
1470 for (; Val; --Val) {
1471 if (OpNo >= MI->getNumOperands()) break;
1472 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1473 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1476 if (OpNo >= MI->getNumOperands()) {
1479 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1480 ++OpNo; // Skip over the ID number.
1482 if (Modifier[0]=='l') // labels are target independent
1483 printBasicBlockLabel(MI->getOperand(OpNo).getMBB(),
1484 false, false, false);
1486 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1487 if ((OpFlags & 7) == 4) {
1488 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1489 Modifier[0] ? Modifier : 0);
1491 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1492 Modifier[0] ? Modifier : 0);
1497 cerr << "Invalid operand found in inline asm: '"
1507 O << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1510 /// printImplicitDef - This method prints the specified machine instruction
1511 /// that is an implicit def.
1512 void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1514 O << '\t' << TAI->getCommentString() << " implicit-def: "
1515 << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n';
1518 /// printLabel - This method prints a local label used by debug and
1519 /// exception handling tables.
1520 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1521 printLabel(MI->getOperand(0).getImm());
1524 void AsmPrinter::printLabel(unsigned Id) const {
1525 O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n";
1528 /// printDeclare - This method prints a local variable declaration used by
1530 /// FIXME: It doesn't really print anything rather it inserts a DebugVariable
1531 /// entry into dwarf table.
1532 void AsmPrinter::printDeclare(const MachineInstr *MI) const {
1533 unsigned FI = MI->getOperand(0).getIndex();
1534 GlobalValue *GV = MI->getOperand(1).getGlobal();
1535 DW->RecordVariable(cast<GlobalVariable>(GV), FI, MI);
1538 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1539 /// instruction, using the specified assembler variant. Targets should
1540 /// overried this to format as appropriate.
1541 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1542 unsigned AsmVariant, const char *ExtraCode) {
1543 // Target doesn't support this yet!
1547 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1548 unsigned AsmVariant,
1549 const char *ExtraCode) {
1550 // Target doesn't support this yet!
1554 /// printBasicBlockLabel - This method prints the label for the specified
1555 /// MachineBasicBlock
1556 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1559 bool printComment) const {
1561 unsigned Align = MBB->getAlignment();
1563 EmitAlignment(Log2_32(Align));
1566 O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_'
1567 << MBB->getNumber();
1570 if (printComment && MBB->getBasicBlock())
1571 O << '\t' << TAI->getCommentString() << ' '
1572 << MBB->getBasicBlock()->getNameStart();
1575 /// printPICJumpTableSetLabel - This method prints a set label for the
1576 /// specified MachineBasicBlock for a jumptable entry.
1577 void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1578 const MachineBasicBlock *MBB) const {
1579 if (!TAI->getSetDirective())
1582 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1583 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1584 printBasicBlockLabel(MBB, false, false, false);
1585 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1586 << '_' << uid << '\n';
1589 void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1590 const MachineBasicBlock *MBB) const {
1591 if (!TAI->getSetDirective())
1594 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1595 << getFunctionNumber() << '_' << uid << '_' << uid2
1596 << "_set_" << MBB->getNumber() << ',';
1597 printBasicBlockLabel(MBB, false, false, false);
1598 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1599 << '_' << uid << '_' << uid2 << '\n';
1602 /// printDataDirective - This method prints the asm directive for the
1604 void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1605 const TargetData *TD = TM.getTargetData();
1606 switch (type->getTypeID()) {
1607 case Type::IntegerTyID: {
1608 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1610 O << TAI->getData8bitsDirective(AddrSpace);
1611 else if (BitWidth <= 16)
1612 O << TAI->getData16bitsDirective(AddrSpace);
1613 else if (BitWidth <= 32)
1614 O << TAI->getData32bitsDirective(AddrSpace);
1615 else if (BitWidth <= 64) {
1616 assert(TAI->getData64bitsDirective(AddrSpace) &&
1617 "Target cannot handle 64-bit constant exprs!");
1618 O << TAI->getData64bitsDirective(AddrSpace);
1620 assert(0 && "Target cannot handle given data directive width!");
1624 case Type::PointerTyID:
1625 if (TD->getPointerSize() == 8) {
1626 assert(TAI->getData64bitsDirective(AddrSpace) &&
1627 "Target cannot handle 64-bit pointer exprs!");
1628 O << TAI->getData64bitsDirective(AddrSpace);
1629 } else if (TD->getPointerSize() == 2) {
1630 O << TAI->getData16bitsDirective(AddrSpace);
1631 } else if (TD->getPointerSize() == 1) {
1632 O << TAI->getData8bitsDirective(AddrSpace);
1634 O << TAI->getData32bitsDirective(AddrSpace);
1637 case Type::FloatTyID: case Type::DoubleTyID:
1638 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1639 assert (0 && "Should have already output floating point constant.");
1641 assert (0 && "Can't handle printing this type of thing");
1646 void AsmPrinter::printSuffixedName(const char *Name, const char *Suffix,
1647 const char *Prefix) {
1650 O << TAI->getPrivateGlobalPrefix();
1651 if (Prefix) O << Prefix;
1663 void AsmPrinter::printSuffixedName(const std::string &Name, const char* Suffix) {
1664 printSuffixedName(Name.c_str(), Suffix);
1667 void AsmPrinter::printVisibility(const std::string& Name,
1668 unsigned Visibility) const {
1669 if (Visibility == GlobalValue::HiddenVisibility) {
1670 if (const char *Directive = TAI->getHiddenDirective())
1671 O << Directive << Name << '\n';
1672 } else if (Visibility == GlobalValue::ProtectedVisibility) {
1673 if (const char *Directive = TAI->getProtectedDirective())
1674 O << Directive << Name << '\n';
1678 void AsmPrinter::printOffset(int64_t Offset) const {
1681 else if (Offset < 0)
1685 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1686 if (!S->usesMetadata())
1689 gcp_iterator GCPI = GCMetadataPrinters.find(S);
1690 if (GCPI != GCMetadataPrinters.end())
1691 return GCPI->second;
1693 const char *Name = S->getName().c_str();
1695 for (GCMetadataPrinterRegistry::iterator
1696 I = GCMetadataPrinterRegistry::begin(),
1697 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1698 if (strcmp(Name, I->getName()) == 0) {
1699 GCMetadataPrinter *GMP = I->instantiate();
1701 GCMetadataPrinters.insert(std::make_pair(S, GMP));
1705 cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n";