1 //===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file 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/MachineConstantPool.h"
20 #include "llvm/CodeGen/MachineJumpTableInfo.h"
21 #include "llvm/Support/CommandLine.h"
22 #include "llvm/Support/Mangler.h"
23 #include "llvm/Support/MathExtras.h"
24 #include "llvm/Support/Streams.h"
25 #include "llvm/Target/TargetAsmInfo.h"
26 #include "llvm/Target/TargetData.h"
27 #include "llvm/Target/TargetLowering.h"
28 #include "llvm/Target/TargetMachine.h"
33 AsmVerbose("asm-verbose", cl::Hidden, cl::desc("Add comments to directives."));
35 char AsmPrinter::ID = 0;
36 AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm,
37 const TargetAsmInfo *T)
38 : MachineFunctionPass((intptr_t)&ID), O(o), TM(tm), TAI(T)
41 std::string AsmPrinter::getSectionForFunction(const Function &F) const {
42 return TAI->getTextSection();
46 /// SwitchToTextSection - Switch to the specified text section of the executable
47 /// if we are not already in it!
49 void AsmPrinter::SwitchToTextSection(const char *NewSection,
50 const GlobalValue *GV) {
52 if (GV && GV->hasSection())
53 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
57 // If we're already in this section, we're done.
58 if (CurrentSection == NS) return;
60 // Close the current section, if applicable.
61 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
62 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
66 if (!CurrentSection.empty())
67 O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
70 /// SwitchToDataSection - Switch to the specified data section of the executable
71 /// if we are not already in it!
73 void AsmPrinter::SwitchToDataSection(const char *NewSection,
74 const GlobalValue *GV) {
76 if (GV && GV->hasSection())
77 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
81 // If we're already in this section, we're done.
82 if (CurrentSection == NS) return;
84 // Close the current section, if applicable.
85 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
86 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
90 if (!CurrentSection.empty())
91 O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
95 bool AsmPrinter::doInitialization(Module &M) {
96 Mang = new Mangler(M, TAI->getGlobalPrefix());
98 if (!M.getModuleInlineAsm().empty())
99 O << TAI->getCommentString() << " Start of file scope inline assembly\n"
100 << M.getModuleInlineAsm()
101 << "\n" << TAI->getCommentString()
102 << " End of file scope inline assembly\n";
104 SwitchToDataSection(""); // Reset back to no section.
106 if (MachineModuleInfo *MMI = getAnalysisToUpdate<MachineModuleInfo>()) {
107 MMI->AnalyzeModule(M);
113 bool AsmPrinter::doFinalization(Module &M) {
114 if (TAI->getWeakRefDirective()) {
115 if (!ExtWeakSymbols.empty())
116 SwitchToDataSection("");
118 for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(),
119 e = ExtWeakSymbols.end(); i != e; ++i) {
120 const GlobalValue *GV = *i;
121 std::string Name = Mang->getValueName(GV);
122 O << TAI->getWeakRefDirective() << Name << "\n";
126 if (TAI->getSetDirective()) {
127 if (!M.alias_empty())
128 SwitchToTextSection(TAI->getTextSection());
131 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
133 std::string Name = Mang->getValueName(I);
136 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
137 Target = Mang->getValueName(GV);
139 if (I->hasExternalLinkage() || !TAI->getWeakRefDirective())
140 O << "\t.globl\t" << Name << "\n";
141 else if (I->hasWeakLinkage())
142 O << TAI->getWeakRefDirective() << Name << "\n";
143 else if (!I->hasInternalLinkage())
144 assert(0 && "Invalid alias linkage");
146 O << TAI->getSetDirective() << Name << ", " << Target << "\n";
148 // If the aliasee has external weak linkage it can be referenced only by
149 // alias itself. In this case it can be not in ExtWeakSymbols list. Emit
150 // weak reference in such case.
151 if (GV->hasExternalWeakLinkage())
152 if (TAI->getWeakRefDirective())
153 O << TAI->getWeakRefDirective() << Target << "\n";
155 O << "\t.globl\t" << Target << "\n";
159 delete Mang; Mang = 0;
163 std::string AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF) {
164 assert(MF && "No machine function?");
165 return Mang->makeNameProper(MF->getFunction()->getName() + ".eh",
166 TAI->getGlobalPrefix());
169 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
170 // What's my mangled name?
171 CurrentFnName = Mang->getValueName(MF.getFunction());
174 /// EmitConstantPool - Print to the current output stream assembly
175 /// representations of the constants in the constant pool MCP. This is
176 /// used to print out constants which have been "spilled to memory" by
177 /// the code generator.
179 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
180 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
181 if (CP.empty()) return;
183 // Some targets require 4-, 8-, and 16- byte constant literals to be placed
184 // in special sections.
185 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
186 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
187 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
188 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
189 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
190 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
191 MachineConstantPoolEntry CPE = CP[i];
192 const Type *Ty = CPE.getType();
193 if (TAI->getFourByteConstantSection() &&
194 TM.getTargetData()->getTypeSize(Ty) == 4)
195 FourByteCPs.push_back(std::make_pair(CPE, i));
196 else if (TAI->getEightByteConstantSection() &&
197 TM.getTargetData()->getTypeSize(Ty) == 8)
198 EightByteCPs.push_back(std::make_pair(CPE, i));
199 else if (TAI->getSixteenByteConstantSection() &&
200 TM.getTargetData()->getTypeSize(Ty) == 16)
201 SixteenByteCPs.push_back(std::make_pair(CPE, i));
203 OtherCPs.push_back(std::make_pair(CPE, i));
206 unsigned Alignment = MCP->getConstantPoolAlignment();
207 EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
208 EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
209 EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
211 EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
214 void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
215 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
216 if (CP.empty()) return;
218 SwitchToDataSection(Section);
219 EmitAlignment(Alignment);
220 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
221 O << TAI->getPrivateGlobalPrefix() << "CPI" << CP[i].second
222 << '_' << CurrentFnName
223 << ":\t\t\t\t\t" << TAI->getCommentString() << ' ';
224 WriteTypeSymbolic(O, CP[i].first.getType(), 0) << '\n';
225 if (CP[i].first.isMachineConstantPoolEntry())
226 EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
228 EmitGlobalConstant(CP[i].first.Val.ConstVal);
230 const Type *Ty = CP[i].first.getType();
232 TM.getTargetData()->getTypeSize(Ty);
233 unsigned ValEnd = CP[i].first.getOffset() + EntSize;
234 // Emit inter-object padding for alignment.
235 EmitZeros(CP[i+1].first.getOffset()-ValEnd);
240 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
241 /// by the current function to the current output stream.
243 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
244 MachineFunction &MF) {
245 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
246 if (JT.empty()) return;
247 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
249 // Use JumpTableDirective otherwise honor the entry size from the jump table
251 const char *JTEntryDirective = TAI->getJumpTableDirective();
252 bool HadJTEntryDirective = JTEntryDirective != NULL;
253 if (!HadJTEntryDirective) {
254 JTEntryDirective = MJTI->getEntrySize() == 4 ?
255 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
258 // Pick the directive to use to print the jump table entries, and switch to
259 // the appropriate section.
260 TargetLowering *LoweringInfo = TM.getTargetLowering();
262 const char* JumpTableDataSection = TAI->getJumpTableDataSection();
263 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
264 !JumpTableDataSection) {
265 // In PIC mode, we need to emit the jump table to the same section as the
266 // function body itself, otherwise the label differences won't make sense.
267 // We should also do if the section name is NULL.
268 const Function *F = MF.getFunction();
269 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
271 SwitchToDataSection(JumpTableDataSection);
274 EmitAlignment(Log2_32(MJTI->getAlignment()));
276 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
277 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
279 // If this jump table was deleted, ignore it.
280 if (JTBBs.empty()) continue;
282 // For PIC codegen, if possible we want to use the SetDirective to reduce
283 // the number of relocations the assembler will generate for the jump table.
284 // Set directives are all printed before the jump table itself.
285 std::set<MachineBasicBlock*> EmittedSets;
286 if (TAI->getSetDirective() && IsPic)
287 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
288 if (EmittedSets.insert(JTBBs[ii]).second)
289 printSetLabel(i, JTBBs[ii]);
291 // On some targets (e.g. darwin) we want to emit two consequtive labels
292 // before each jump table. The first label is never referenced, but tells
293 // the assembler and linker the extents of the jump table object. The
294 // second label is actually referenced by the code.
295 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
296 O << JTLabelPrefix << "JTI" << i << '_' << CurrentFnName << ":\n";
298 O << TAI->getPrivateGlobalPrefix() << "JTI" << i
299 << '_' << CurrentFnName << ":\n";
301 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
302 O << JTEntryDirective << ' ';
303 // If we have emitted set directives for the jump table entries, print
304 // them rather than the entries themselves. If we're emitting PIC, then
305 // emit the table entries as differences between two text section labels.
306 // If we're emitting non-PIC code, then emit the entries as direct
307 // references to the target basic blocks.
308 if (!EmittedSets.empty()) {
309 O << TAI->getPrivateGlobalPrefix() << i
310 << '_' << "_set_" << JTBBs[ii]->getNumber() << '_' << CurrentFnName;
312 printBasicBlockLabel(JTBBs[ii], false, false);
313 // If the arch uses custom Jump Table directives, don't calc relative to
315 if (!HadJTEntryDirective)
316 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
317 << i << '_' << CurrentFnName;
319 printBasicBlockLabel(JTBBs[ii], false, false);
326 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
327 /// special global used by LLVM. If so, emit it and return true, otherwise
328 /// do nothing and return false.
329 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
330 if (GV->getName() == "llvm.used") {
331 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
332 EmitLLVMUsedList(GV->getInitializer());
336 // Ignore debug and non-emitted data.
337 if (GV->getSection() == "llvm.metadata") return true;
339 if (!GV->hasAppendingLinkage()) return false;
341 assert(GV->hasInitializer() && "Not a special LLVM global!");
343 const TargetData *TD = TM.getTargetData();
344 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
345 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
346 SwitchToDataSection(TAI->getStaticCtorsSection());
347 EmitAlignment(Align, 0);
348 EmitXXStructorList(GV->getInitializer());
352 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
353 SwitchToDataSection(TAI->getStaticDtorsSection());
354 EmitAlignment(Align, 0);
355 EmitXXStructorList(GV->getInitializer());
362 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
363 /// global in the specified llvm.used list as being used with this directive.
364 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
365 const char *Directive = TAI->getUsedDirective();
367 // Should be an array of 'sbyte*'.
368 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
369 if (InitList == 0) return;
371 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
373 EmitConstantValueOnly(InitList->getOperand(i));
378 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
379 /// function pointers, ignoring the init priority.
380 void AsmPrinter::EmitXXStructorList(Constant *List) {
381 // Should be an array of '{ int, void ()* }' structs. The first value is the
382 // init priority, which we ignore.
383 if (!isa<ConstantArray>(List)) return;
384 ConstantArray *InitList = cast<ConstantArray>(List);
385 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
386 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
387 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
389 if (CS->getOperand(1)->isNullValue())
390 return; // Found a null terminator, exit printing.
391 // Emit the function pointer.
392 EmitGlobalConstant(CS->getOperand(1));
396 /// getGlobalLinkName - Returns the asm/link name of of the specified
397 /// global variable. Should be overridden by each target asm printer to
398 /// generate the appropriate value.
399 const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
400 std::string LinkName;
402 if (isa<Function>(GV)) {
403 LinkName += TAI->getFunctionAddrPrefix();
404 LinkName += Mang->getValueName(GV);
405 LinkName += TAI->getFunctionAddrSuffix();
407 LinkName += TAI->getGlobalVarAddrPrefix();
408 LinkName += Mang->getValueName(GV);
409 LinkName += TAI->getGlobalVarAddrSuffix();
415 /// EmitExternalGlobal - Emit the external reference to a global variable.
416 /// Should be overridden if an indirect reference should be used.
417 void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
418 O << getGlobalLinkName(GV);
423 //===----------------------------------------------------------------------===//
424 /// LEB 128 number encoding.
426 /// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
427 /// representing an unsigned leb128 value.
428 void AsmPrinter::PrintULEB128(unsigned Value) const {
430 unsigned Byte = Value & 0x7f;
432 if (Value) Byte |= 0x80;
433 O << "0x" << std::hex << Byte << std::dec;
434 if (Value) O << ", ";
438 /// SizeULEB128 - Compute the number of bytes required for an unsigned leb128
440 unsigned AsmPrinter::SizeULEB128(unsigned Value) {
444 Size += sizeof(int8_t);
449 /// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
450 /// representing a signed leb128 value.
451 void AsmPrinter::PrintSLEB128(int Value) const {
452 int Sign = Value >> (8 * sizeof(Value) - 1);
456 unsigned Byte = Value & 0x7f;
458 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
459 if (IsMore) Byte |= 0x80;
460 O << "0x" << std::hex << Byte << std::dec;
461 if (IsMore) O << ", ";
465 /// SizeSLEB128 - Compute the number of bytes required for a signed leb128
467 unsigned AsmPrinter::SizeSLEB128(int Value) {
469 int Sign = Value >> (8 * sizeof(Value) - 1);
473 unsigned Byte = Value & 0x7f;
475 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
476 Size += sizeof(int8_t);
481 //===--------------------------------------------------------------------===//
482 // Emission and print routines
485 /// PrintHex - Print a value as a hexidecimal value.
487 void AsmPrinter::PrintHex(int Value) const {
488 O << "0x" << std::hex << Value << std::dec;
491 /// EOL - Print a newline character to asm stream. If a comment is present
492 /// then it will be printed first. Comments should not contain '\n'.
493 void AsmPrinter::EOL() const {
496 void AsmPrinter::EOL(const std::string &Comment) const {
497 if (AsmVerbose && !Comment.empty()) {
499 << TAI->getCommentString()
506 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
507 /// unsigned leb128 value.
508 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
509 if (TAI->hasLEB128()) {
513 O << TAI->getData8bitsDirective();
518 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
519 /// signed leb128 value.
520 void AsmPrinter::EmitSLEB128Bytes(int Value) const {
521 if (TAI->hasLEB128()) {
525 O << TAI->getData8bitsDirective();
530 /// EmitInt8 - Emit a byte directive and value.
532 void AsmPrinter::EmitInt8(int Value) const {
533 O << TAI->getData8bitsDirective();
534 PrintHex(Value & 0xFF);
537 /// EmitInt16 - Emit a short directive and value.
539 void AsmPrinter::EmitInt16(int Value) const {
540 O << TAI->getData16bitsDirective();
541 PrintHex(Value & 0xFFFF);
544 /// EmitInt32 - Emit a long directive and value.
546 void AsmPrinter::EmitInt32(int Value) const {
547 O << TAI->getData32bitsDirective();
551 /// EmitInt64 - Emit a long long directive and value.
553 void AsmPrinter::EmitInt64(uint64_t Value) const {
554 if (TAI->getData64bitsDirective()) {
555 O << TAI->getData64bitsDirective();
558 if (TM.getTargetData()->isBigEndian()) {
559 EmitInt32(unsigned(Value >> 32)); O << "\n";
560 EmitInt32(unsigned(Value));
562 EmitInt32(unsigned(Value)); O << "\n";
563 EmitInt32(unsigned(Value >> 32));
568 /// toOctal - Convert the low order bits of X into an octal digit.
570 static inline char toOctal(int X) {
574 /// printStringChar - Print a char, escaped if necessary.
576 static void printStringChar(std::ostream &O, unsigned char C) {
579 } else if (C == '\\') {
581 } else if (isprint(C)) {
585 case '\b': O << "\\b"; break;
586 case '\f': O << "\\f"; break;
587 case '\n': O << "\\n"; break;
588 case '\r': O << "\\r"; break;
589 case '\t': O << "\\t"; break;
592 O << toOctal(C >> 6);
593 O << toOctal(C >> 3);
594 O << toOctal(C >> 0);
600 /// EmitString - Emit a string with quotes and a null terminator.
601 /// Special characters are emitted properly.
602 /// \literal (Eg. '\t') \endliteral
603 void AsmPrinter::EmitString(const std::string &String) const {
604 const char* AscizDirective = TAI->getAscizDirective();
608 O << TAI->getAsciiDirective();
610 for (unsigned i = 0, N = String.size(); i < N; ++i) {
611 unsigned char C = String[i];
612 printStringChar(O, C);
621 /// EmitFile - Emit a .file directive.
622 void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
623 O << "\t.file\t" << Number << " \"";
624 for (unsigned i = 0, N = Name.size(); i < N; ++i) {
625 unsigned char C = Name[i];
626 printStringChar(O, C);
632 //===----------------------------------------------------------------------===//
634 // EmitAlignment - Emit an alignment directive to the specified power of
635 // two boundary. For example, if you pass in 3 here, you will get an 8
636 // byte alignment. If a global value is specified, and if that global has
637 // an explicit alignment requested, it will unconditionally override the
638 // alignment request. However, if ForcedAlignBits is specified, this value
639 // has final say: the ultimate alignment will be the max of ForcedAlignBits
640 // and the alignment computed with NumBits and the global.
644 // if (GV && GV->hasalignment) Align = GV->getalignment();
645 // Align = std::max(Align, ForcedAlignBits);
647 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
648 unsigned ForcedAlignBits, bool UseFillExpr,
649 unsigned FillValue) const {
650 if (GV && GV->getAlignment())
651 NumBits = Log2_32(GV->getAlignment());
652 NumBits = std::max(NumBits, ForcedAlignBits);
654 if (NumBits == 0) return; // No need to emit alignment.
655 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
656 O << TAI->getAlignDirective() << NumBits;
657 if (UseFillExpr) O << ",0x" << std::hex << FillValue << std::dec;
662 /// EmitZeros - Emit a block of zeros.
664 void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
666 if (TAI->getZeroDirective()) {
667 O << TAI->getZeroDirective() << NumZeros;
668 if (TAI->getZeroDirectiveSuffix())
669 O << TAI->getZeroDirectiveSuffix();
672 for (; NumZeros; --NumZeros)
673 O << TAI->getData8bitsDirective() << "0\n";
678 // Print out the specified constant, without a storage class. Only the
679 // constants valid in constant expressions can occur here.
680 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
681 if (CV->isNullValue() || isa<UndefValue>(CV))
683 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
684 O << CI->getZExtValue();
685 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
686 // This is a constant address for a global variable or function. Use the
687 // name of the variable or function as the address value, possibly
688 // decorating it with GlobalVarAddrPrefix/Suffix or
689 // FunctionAddrPrefix/Suffix (these all default to "" )
690 if (isa<Function>(GV)) {
691 O << TAI->getFunctionAddrPrefix()
692 << Mang->getValueName(GV)
693 << TAI->getFunctionAddrSuffix();
695 O << TAI->getGlobalVarAddrPrefix()
696 << Mang->getValueName(GV)
697 << TAI->getGlobalVarAddrSuffix();
699 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
700 const TargetData *TD = TM.getTargetData();
701 unsigned Opcode = CE->getOpcode();
703 case Instruction::GetElementPtr: {
704 // generate a symbolic expression for the byte address
705 const Constant *ptrVal = CE->getOperand(0);
706 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
707 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
711 EmitConstantValueOnly(ptrVal);
713 O << ") + " << Offset;
715 O << ") - " << -Offset;
717 EmitConstantValueOnly(ptrVal);
721 case Instruction::Trunc:
722 case Instruction::ZExt:
723 case Instruction::SExt:
724 case Instruction::FPTrunc:
725 case Instruction::FPExt:
726 case Instruction::UIToFP:
727 case Instruction::SIToFP:
728 case Instruction::FPToUI:
729 case Instruction::FPToSI:
730 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
732 case Instruction::BitCast:
733 return EmitConstantValueOnly(CE->getOperand(0));
735 case Instruction::IntToPtr: {
736 // Handle casts to pointers by changing them into casts to the appropriate
737 // integer type. This promotes constant folding and simplifies this code.
738 Constant *Op = CE->getOperand(0);
739 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
740 return EmitConstantValueOnly(Op);
744 case Instruction::PtrToInt: {
745 // Support only foldable casts to/from pointers that can be eliminated by
746 // changing the pointer to the appropriately sized integer type.
747 Constant *Op = CE->getOperand(0);
748 const Type *Ty = CE->getType();
750 // We can emit the pointer value into this slot if the slot is an
751 // integer slot greater or equal to the size of the pointer.
752 if (Ty->isInteger() &&
753 TD->getTypeSize(Ty) >= TD->getTypeSize(Op->getType()))
754 return EmitConstantValueOnly(Op);
756 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
757 EmitConstantValueOnly(Op);
760 case Instruction::Add:
761 case Instruction::Sub:
763 EmitConstantValueOnly(CE->getOperand(0));
764 O << (Opcode==Instruction::Add ? ") + (" : ") - (");
765 EmitConstantValueOnly(CE->getOperand(1));
769 assert(0 && "Unsupported operator!");
772 assert(0 && "Unknown constant value!");
776 /// printAsCString - Print the specified array as a C compatible string, only if
777 /// the predicate isString is true.
779 static void printAsCString(std::ostream &O, const ConstantArray *CVA,
781 assert(CVA->isString() && "Array is not string compatible!");
784 for (unsigned i = 0; i != LastElt; ++i) {
786 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
787 printStringChar(O, C);
792 /// EmitString - Emit a zero-byte-terminated string constant.
794 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
795 unsigned NumElts = CVA->getNumOperands();
796 if (TAI->getAscizDirective() && NumElts &&
797 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
798 O << TAI->getAscizDirective();
799 printAsCString(O, CVA, NumElts-1);
801 O << TAI->getAsciiDirective();
802 printAsCString(O, CVA, NumElts);
807 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
809 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
810 const TargetData *TD = TM.getTargetData();
812 if (CV->isNullValue() || isa<UndefValue>(CV)) {
813 EmitZeros(TD->getTypeSize(CV->getType()));
815 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
816 if (CVA->isString()) {
818 } else { // Not a string. Print the values in successive locations
819 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) {
820 EmitGlobalConstant(CVA->getOperand(i));
821 const Type* EltTy = CVA->getType()->getElementType();
822 uint64_t padSize = TD->getABITypeSize(EltTy) - TD->getTypeSize(EltTy);
827 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
828 // Print the fields in successive locations. Pad to align if needed!
829 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
830 uint64_t sizeSoFar = 0;
831 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
832 const Constant* field = CVS->getOperand(i);
834 // Check if padding is needed and insert one or more 0s.
835 uint64_t fieldSize = TD->getTypeSize(field->getType());
836 uint64_t padSize = ((i == e-1? cvsLayout->getSizeInBytes()
837 : cvsLayout->getElementOffset(i+1))
838 - cvsLayout->getElementOffset(i)) - fieldSize;
839 sizeSoFar += fieldSize + padSize;
841 // Now print the actual field value
842 EmitGlobalConstant(field);
844 // Insert the field padding unless it's zero bytes...
847 assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
848 "Layout of constant struct may be incorrect!");
850 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
851 // FP Constants are printed as integer constants to avoid losing
853 if (CFP->getType() == Type::DoubleTy) {
854 double Val = CFP->getValueAPF().convertToDouble(); // for comment only
855 uint64_t i = CFP->getValueAPF().convertToAPInt().getZExtValue();
856 if (TAI->getData64bitsDirective())
857 O << TAI->getData64bitsDirective() << i << "\t"
858 << TAI->getCommentString() << " double value: " << Val << "\n";
859 else if (TD->isBigEndian()) {
860 O << TAI->getData32bitsDirective() << unsigned(i >> 32)
861 << "\t" << TAI->getCommentString()
862 << " double most significant word " << Val << "\n";
863 O << TAI->getData32bitsDirective() << unsigned(i)
864 << "\t" << TAI->getCommentString()
865 << " double least significant word " << Val << "\n";
867 O << TAI->getData32bitsDirective() << unsigned(i)
868 << "\t" << TAI->getCommentString()
869 << " double least significant word " << Val << "\n";
870 O << TAI->getData32bitsDirective() << unsigned(i >> 32)
871 << "\t" << TAI->getCommentString()
872 << " double most significant word " << Val << "\n";
875 } else if (CFP->getType() == Type::FloatTy) {
876 float Val = CFP->getValueAPF().convertToFloat(); // for comment only
877 O << TAI->getData32bitsDirective()
878 << CFP->getValueAPF().convertToAPInt().getZExtValue()
879 << "\t" << TAI->getCommentString() << " float " << Val << "\n";
881 } else if (CFP->getType() == Type::X86_FP80Ty) {
882 // all long double variants are printed as hex
883 // api needed to prevent premature destruction
884 APInt api = CFP->getValueAPF().convertToAPInt();
885 const uint64_t *p = api.getRawData();
886 if (TD->isBigEndian()) {
887 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 48)
888 << "\t" << TAI->getCommentString()
889 << " long double most significant halfword\n";
890 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 32)
891 << "\t" << TAI->getCommentString()
892 << " long double next halfword\n";
893 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 16)
894 << "\t" << TAI->getCommentString()
895 << " long double next halfword\n";
896 O << TAI->getData16bitsDirective() << uint16_t(p[0])
897 << "\t" << TAI->getCommentString()
898 << " long double next halfword\n";
899 O << TAI->getData16bitsDirective() << uint16_t(p[1])
900 << "\t" << TAI->getCommentString()
901 << " long double least significant halfword\n";
903 O << TAI->getData16bitsDirective() << uint16_t(p[1])
904 << "\t" << TAI->getCommentString()
905 << " long double least significant halfword\n";
906 O << TAI->getData16bitsDirective() << uint16_t(p[0])
907 << "\t" << TAI->getCommentString()
908 << " long double next halfword\n";
909 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 16)
910 << "\t" << TAI->getCommentString()
911 << " long double next halfword\n";
912 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 32)
913 << "\t" << TAI->getCommentString()
914 << " long double next halfword\n";
915 O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 48)
916 << "\t" << TAI->getCommentString()
917 << " long double most significant halfword\n";
920 } else if (CFP->getType() == Type::PPC_FP128Ty) {
921 // all long double variants are printed as hex
922 // api needed to prevent premature destruction
923 APInt api = CFP->getValueAPF().convertToAPInt();
924 const uint64_t *p = api.getRawData();
925 if (TD->isBigEndian()) {
926 O << TAI->getData32bitsDirective() << uint32_t(p[0] >> 32)
927 << "\t" << TAI->getCommentString()
928 << " long double most significant word\n";
929 O << TAI->getData32bitsDirective() << uint32_t(p[0])
930 << "\t" << TAI->getCommentString()
931 << " long double next word\n";
932 O << TAI->getData32bitsDirective() << uint32_t(p[1] >> 32)
933 << "\t" << TAI->getCommentString()
934 << " long double next word\n";
935 O << TAI->getData32bitsDirective() << uint32_t(p[1])
936 << "\t" << TAI->getCommentString()
937 << " long double least significant word\n";
939 O << TAI->getData32bitsDirective() << uint32_t(p[1])
940 << "\t" << TAI->getCommentString()
941 << " long double least significant word\n";
942 O << TAI->getData32bitsDirective() << uint32_t(p[1] >> 32)
943 << "\t" << TAI->getCommentString()
944 << " long double next word\n";
945 O << TAI->getData32bitsDirective() << uint32_t(p[0])
946 << "\t" << TAI->getCommentString()
947 << " long double next word\n";
948 O << TAI->getData32bitsDirective() << uint32_t(p[0] >> 32)
949 << "\t" << TAI->getCommentString()
950 << " long double most significant word\n";
953 } else assert(0 && "Floating point constant type not handled");
954 } else if (CV->getType() == Type::Int64Ty) {
955 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
956 uint64_t Val = CI->getZExtValue();
958 if (TAI->getData64bitsDirective())
959 O << TAI->getData64bitsDirective() << Val << "\n";
960 else if (TD->isBigEndian()) {
961 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
962 << "\t" << TAI->getCommentString()
963 << " Double-word most significant word " << Val << "\n";
964 O << TAI->getData32bitsDirective() << unsigned(Val)
965 << "\t" << TAI->getCommentString()
966 << " Double-word least significant word " << Val << "\n";
968 O << TAI->getData32bitsDirective() << unsigned(Val)
969 << "\t" << TAI->getCommentString()
970 << " Double-word least significant word " << Val << "\n";
971 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
972 << "\t" << TAI->getCommentString()
973 << " Double-word most significant word " << Val << "\n";
977 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
978 const VectorType *PTy = CP->getType();
980 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
981 EmitGlobalConstant(CP->getOperand(I));
986 const Type *type = CV->getType();
987 printDataDirective(type);
988 EmitConstantValueOnly(CV);
993 AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
994 // Target doesn't support this yet!
998 /// PrintSpecial - Print information related to the specified machine instr
999 /// that is independent of the operand, and may be independent of the instr
1000 /// itself. This can be useful for portably encoding the comment character
1001 /// or other bits of target-specific knowledge into the asmstrings. The
1002 /// syntax used is ${:comment}. Targets can override this to add support
1003 /// for their own strange codes.
1004 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
1005 if (!strcmp(Code, "private")) {
1006 O << TAI->getPrivateGlobalPrefix();
1007 } else if (!strcmp(Code, "comment")) {
1008 O << TAI->getCommentString();
1009 } else if (!strcmp(Code, "uid")) {
1010 // Assign a unique ID to this machine instruction.
1011 static const MachineInstr *LastMI = 0;
1012 static const Function *F = 0;
1013 static unsigned Counter = 0U-1;
1015 // Comparing the address of MI isn't sufficient, because machineinstrs may
1016 // be allocated to the same address across functions.
1017 const Function *ThisF = MI->getParent()->getParent()->getFunction();
1019 // If this is a new machine instruction, bump the counter.
1020 if (LastMI != MI || F != ThisF) {
1027 cerr << "Unknown special formatter '" << Code
1028 << "' for machine instr: " << *MI;
1034 /// printInlineAsm - This method formats and prints the specified machine
1035 /// instruction that is an inline asm.
1036 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1037 unsigned NumOperands = MI->getNumOperands();
1039 // Count the number of register definitions.
1040 unsigned NumDefs = 0;
1041 for (; MI->getOperand(NumDefs).isRegister() && MI->getOperand(NumDefs).isDef();
1043 assert(NumDefs != NumOperands-1 && "No asm string?");
1045 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
1047 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1048 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1050 // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
1051 if (AsmStr[0] == 0) {
1052 O << "\n"; // Tab already printed, avoid double indenting next instr.
1056 O << TAI->getInlineAsmStart() << "\n\t";
1058 // The variant of the current asmprinter.
1059 int AsmPrinterVariant = TAI->getAssemblerDialect();
1061 int CurVariant = -1; // The number of the {.|.|.} region we are in.
1062 const char *LastEmitted = AsmStr; // One past the last character emitted.
1064 while (*LastEmitted) {
1065 switch (*LastEmitted) {
1067 // Not a special case, emit the string section literally.
1068 const char *LiteralEnd = LastEmitted+1;
1069 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1070 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1072 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1073 O.write(LastEmitted, LiteralEnd-LastEmitted);
1074 LastEmitted = LiteralEnd;
1078 ++LastEmitted; // Consume newline character.
1079 O << "\n"; // Indent code with newline.
1082 ++LastEmitted; // Consume '$' character.
1086 switch (*LastEmitted) {
1087 default: Done = false; break;
1088 case '$': // $$ -> $
1089 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1091 ++LastEmitted; // Consume second '$' character.
1093 case '(': // $( -> same as GCC's { character.
1094 ++LastEmitted; // Consume '(' character.
1095 if (CurVariant != -1) {
1096 cerr << "Nested variants found in inline asm string: '"
1100 CurVariant = 0; // We're in the first variant now.
1103 ++LastEmitted; // consume '|' character.
1104 if (CurVariant == -1) {
1105 cerr << "Found '|' character outside of variant in inline asm "
1106 << "string: '" << AsmStr << "'\n";
1109 ++CurVariant; // We're in the next variant.
1111 case ')': // $) -> same as GCC's } char.
1112 ++LastEmitted; // consume ')' character.
1113 if (CurVariant == -1) {
1114 cerr << "Found '}' character outside of variant in inline asm "
1115 << "string: '" << AsmStr << "'\n";
1123 bool HasCurlyBraces = false;
1124 if (*LastEmitted == '{') { // ${variable}
1125 ++LastEmitted; // Consume '{' character.
1126 HasCurlyBraces = true;
1129 const char *IDStart = LastEmitted;
1132 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1133 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1134 cerr << "Bad $ operand number in inline asm string: '"
1138 LastEmitted = IDEnd;
1140 char Modifier[2] = { 0, 0 };
1142 if (HasCurlyBraces) {
1143 // If we have curly braces, check for a modifier character. This
1144 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1145 if (*LastEmitted == ':') {
1146 ++LastEmitted; // Consume ':' character.
1147 if (*LastEmitted == 0) {
1148 cerr << "Bad ${:} expression in inline asm string: '"
1153 Modifier[0] = *LastEmitted;
1154 ++LastEmitted; // Consume modifier character.
1157 if (*LastEmitted != '}') {
1158 cerr << "Bad ${} expression in inline asm string: '"
1162 ++LastEmitted; // Consume '}' character.
1165 if ((unsigned)Val >= NumOperands-1) {
1166 cerr << "Invalid $ operand number in inline asm string: '"
1171 // Okay, we finally have a value number. Ask the target to print this
1173 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1178 // Scan to find the machine operand number for the operand.
1179 for (; Val; --Val) {
1180 if (OpNo >= MI->getNumOperands()) break;
1181 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1182 OpNo += (OpFlags >> 3) + 1;
1185 if (OpNo >= MI->getNumOperands()) {
1188 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1189 ++OpNo; // Skip over the ID number.
1191 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1192 if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
1193 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1194 Modifier[0] ? Modifier : 0);
1196 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1197 Modifier[0] ? Modifier : 0);
1201 cerr << "Invalid operand found in inline asm: '"
1211 O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
1214 /// printLabel - This method prints a local label used by debug and
1215 /// exception handling tables.
1216 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1218 << TAI->getPrivateGlobalPrefix()
1220 << MI->getOperand(0).getImmedValue()
1224 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1225 /// instruction, using the specified assembler variant. Targets should
1226 /// overried this to format as appropriate.
1227 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1228 unsigned AsmVariant, const char *ExtraCode) {
1229 // Target doesn't support this yet!
1233 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1234 unsigned AsmVariant,
1235 const char *ExtraCode) {
1236 // Target doesn't support this yet!
1240 /// printBasicBlockLabel - This method prints the label for the specified
1241 /// MachineBasicBlock
1242 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1244 bool printComment) const {
1245 O << TAI->getPrivateGlobalPrefix() << "BB" << MBB->getNumber() << '_'
1249 if (printComment && MBB->getBasicBlock())
1250 O << '\t' << TAI->getCommentString() << ' '
1251 << MBB->getBasicBlock()->getName();
1254 /// printSetLabel - This method prints a set label for the specified
1255 /// MachineBasicBlock
1256 void AsmPrinter::printSetLabel(unsigned uid,
1257 const MachineBasicBlock *MBB) const {
1258 if (!TAI->getSetDirective())
1261 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1262 << uid << "_set_" << MBB->getNumber() << '_' << CurrentFnName << ',';
1263 printBasicBlockLabel(MBB, false, false);
1264 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << uid
1265 << '_' << CurrentFnName << '\n';
1268 void AsmPrinter::printSetLabel(unsigned uid, unsigned uid2,
1269 const MachineBasicBlock *MBB) const {
1270 if (!TAI->getSetDirective())
1273 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1274 << uid << '_' << uid2
1275 << "_set_" << MBB->getNumber() << '_' << CurrentFnName << ',';
1276 printBasicBlockLabel(MBB, false, false);
1277 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << uid
1278 << '_' << uid2 << '_' << CurrentFnName << '\n';
1281 /// printDataDirective - This method prints the asm directive for the
1283 void AsmPrinter::printDataDirective(const Type *type) {
1284 const TargetData *TD = TM.getTargetData();
1285 switch (type->getTypeID()) {
1286 case Type::IntegerTyID: {
1287 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1289 O << TAI->getData8bitsDirective();
1290 else if (BitWidth <= 16)
1291 O << TAI->getData16bitsDirective();
1292 else if (BitWidth <= 32)
1293 O << TAI->getData32bitsDirective();
1294 else if (BitWidth <= 64) {
1295 assert(TAI->getData64bitsDirective() &&
1296 "Target cannot handle 64-bit constant exprs!");
1297 O << TAI->getData64bitsDirective();
1301 case Type::PointerTyID:
1302 if (TD->getPointerSize() == 8) {
1303 assert(TAI->getData64bitsDirective() &&
1304 "Target cannot handle 64-bit pointer exprs!");
1305 O << TAI->getData64bitsDirective();
1307 O << TAI->getData32bitsDirective();
1310 case Type::FloatTyID: case Type::DoubleTyID:
1311 case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1312 assert (0 && "Should have already output floating point constant.");
1314 assert (0 && "Can't handle printing this type of thing");