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), FunctionNumber(0), 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 if (const GlobalValue *GV = I->getAliasedGlobal())
137 Target = Mang->getValueName(GV);
139 assert(0 && "Unsupported aliasee");
141 if (I->hasExternalLinkage())
142 O << "\t.globl\t" << Name << "\n";
143 else if (I->hasWeakLinkage())
144 O << TAI->getWeakRefDirective() << Name << "\n";
145 else if (!I->hasInternalLinkage())
146 assert(0 && "Invalid alias linkage");
148 O << TAI->getSetDirective() << Name << ", " << Target << "\n";
152 delete Mang; Mang = 0;
156 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
157 // What's my mangled name?
158 CurrentFnName = Mang->getValueName(MF.getFunction());
159 IncrementFunctionNumber();
162 /// EmitConstantPool - Print to the current output stream assembly
163 /// representations of the constants in the constant pool MCP. This is
164 /// used to print out constants which have been "spilled to memory" by
165 /// the code generator.
167 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
168 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
169 if (CP.empty()) return;
171 // Some targets require 4-, 8-, and 16- byte constant literals to be placed
172 // in special sections.
173 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
174 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
175 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
176 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
177 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
178 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
179 MachineConstantPoolEntry CPE = CP[i];
180 const Type *Ty = CPE.getType();
181 if (TAI->getFourByteConstantSection() &&
182 TM.getTargetData()->getTypeSize(Ty) == 4)
183 FourByteCPs.push_back(std::make_pair(CPE, i));
184 else if (TAI->getEightByteConstantSection() &&
185 TM.getTargetData()->getTypeSize(Ty) == 8)
186 EightByteCPs.push_back(std::make_pair(CPE, i));
187 else if (TAI->getSixteenByteConstantSection() &&
188 TM.getTargetData()->getTypeSize(Ty) == 16)
189 SixteenByteCPs.push_back(std::make_pair(CPE, i));
191 OtherCPs.push_back(std::make_pair(CPE, i));
194 unsigned Alignment = MCP->getConstantPoolAlignment();
195 EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
196 EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
197 EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
199 EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
202 void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
203 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
204 if (CP.empty()) return;
206 SwitchToDataSection(Section);
207 EmitAlignment(Alignment);
208 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
209 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
210 << CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << " ";
211 WriteTypeSymbolic(O, CP[i].first.getType(), 0) << '\n';
212 if (CP[i].first.isMachineConstantPoolEntry())
213 EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
215 EmitGlobalConstant(CP[i].first.Val.ConstVal);
217 const Type *Ty = CP[i].first.getType();
219 TM.getTargetData()->getTypeSize(Ty);
220 unsigned ValEnd = CP[i].first.getOffset() + EntSize;
221 // Emit inter-object padding for alignment.
222 EmitZeros(CP[i+1].first.getOffset()-ValEnd);
227 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
228 /// by the current function to the current output stream.
230 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
231 MachineFunction &MF) {
232 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
233 if (JT.empty()) return;
234 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
236 // Use JumpTableDirective otherwise honor the entry size from the jump table
238 const char *JTEntryDirective = TAI->getJumpTableDirective();
239 bool HadJTEntryDirective = JTEntryDirective != NULL;
240 if (!HadJTEntryDirective) {
241 JTEntryDirective = MJTI->getEntrySize() == 4 ?
242 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
245 // Pick the directive to use to print the jump table entries, and switch to
246 // the appropriate section.
247 TargetLowering *LoweringInfo = TM.getTargetLowering();
249 const char* JumpTableDataSection = TAI->getJumpTableDataSection();
250 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
251 !JumpTableDataSection) {
252 // In PIC mode, we need to emit the jump table to the same section as the
253 // function body itself, otherwise the label differences won't make sense.
254 // We should also do if the section name is NULL.
255 const Function *F = MF.getFunction();
256 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
258 SwitchToDataSection(JumpTableDataSection);
261 EmitAlignment(Log2_32(MJTI->getAlignment()));
263 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
264 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
266 // If this jump table was deleted, ignore it.
267 if (JTBBs.empty()) continue;
269 // For PIC codegen, if possible we want to use the SetDirective to reduce
270 // the number of relocations the assembler will generate for the jump table.
271 // Set directives are all printed before the jump table itself.
272 std::set<MachineBasicBlock*> EmittedSets;
273 if (TAI->getSetDirective() && IsPic)
274 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
275 if (EmittedSets.insert(JTBBs[ii]).second)
276 printSetLabel(i, JTBBs[ii]);
278 // On some targets (e.g. darwin) we want to emit two consequtive labels
279 // before each jump table. The first label is never referenced, but tells
280 // the assembler and linker the extents of the jump table object. The
281 // second label is actually referenced by the code.
282 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
283 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
285 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
286 << '_' << i << ":\n";
288 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
289 O << JTEntryDirective << ' ';
290 // If we have emitted set directives for the jump table entries, print
291 // them rather than the entries themselves. If we're emitting PIC, then
292 // emit the table entries as differences between two text section labels.
293 // If we're emitting non-PIC code, then emit the entries as direct
294 // references to the target basic blocks.
295 if (!EmittedSets.empty()) {
296 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
297 << '_' << i << "_set_" << JTBBs[ii]->getNumber();
299 printBasicBlockLabel(JTBBs[ii], false, false);
300 // If the arch uses custom Jump Table directives, don't calc relative to
302 if (!HadJTEntryDirective)
303 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
304 << getFunctionNumber() << '_' << i;
306 printBasicBlockLabel(JTBBs[ii], false, false);
313 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
314 /// special global used by LLVM. If so, emit it and return true, otherwise
315 /// do nothing and return false.
316 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
317 if (GV->getName() == "llvm.used") {
318 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
319 EmitLLVMUsedList(GV->getInitializer());
323 // Ignore debug and non-emitted data.
324 if (GV->getSection() == "llvm.metadata") return true;
326 if (!GV->hasAppendingLinkage()) return false;
328 assert(GV->hasInitializer() && "Not a special LLVM global!");
330 const TargetData *TD = TM.getTargetData();
331 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
332 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
333 SwitchToDataSection(TAI->getStaticCtorsSection());
334 EmitAlignment(Align, 0);
335 EmitXXStructorList(GV->getInitializer());
339 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
340 SwitchToDataSection(TAI->getStaticDtorsSection());
341 EmitAlignment(Align, 0);
342 EmitXXStructorList(GV->getInitializer());
349 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
350 /// global in the specified llvm.used list as being used with this directive.
351 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
352 const char *Directive = TAI->getUsedDirective();
354 // Should be an array of 'sbyte*'.
355 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
356 if (InitList == 0) return;
358 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
360 EmitConstantValueOnly(InitList->getOperand(i));
365 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
366 /// function pointers, ignoring the init priority.
367 void AsmPrinter::EmitXXStructorList(Constant *List) {
368 // Should be an array of '{ int, void ()* }' structs. The first value is the
369 // init priority, which we ignore.
370 if (!isa<ConstantArray>(List)) return;
371 ConstantArray *InitList = cast<ConstantArray>(List);
372 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
373 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
374 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
376 if (CS->getOperand(1)->isNullValue())
377 return; // Found a null terminator, exit printing.
378 // Emit the function pointer.
379 EmitGlobalConstant(CS->getOperand(1));
383 /// getGlobalLinkName - Returns the asm/link name of of the specified
384 /// global variable. Should be overridden by each target asm printer to
385 /// generate the appropriate value.
386 const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
387 std::string LinkName;
389 if (isa<Function>(GV)) {
390 LinkName += TAI->getFunctionAddrPrefix();
391 LinkName += Mang->getValueName(GV);
392 LinkName += TAI->getFunctionAddrSuffix();
394 LinkName += TAI->getGlobalVarAddrPrefix();
395 LinkName += Mang->getValueName(GV);
396 LinkName += TAI->getGlobalVarAddrSuffix();
402 /// EmitExternalGlobal - Emit the external reference to a global variable.
403 /// Should be overridden if an indirect reference should be used.
404 void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
405 O << getGlobalLinkName(GV);
410 //===----------------------------------------------------------------------===//
411 /// LEB 128 number encoding.
413 /// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
414 /// representing an unsigned leb128 value.
415 void AsmPrinter::PrintULEB128(unsigned Value) const {
417 unsigned Byte = Value & 0x7f;
419 if (Value) Byte |= 0x80;
420 O << "0x" << std::hex << Byte << std::dec;
421 if (Value) O << ", ";
425 /// SizeULEB128 - Compute the number of bytes required for an unsigned leb128
427 unsigned AsmPrinter::SizeULEB128(unsigned Value) {
431 Size += sizeof(int8_t);
436 /// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
437 /// representing a signed leb128 value.
438 void AsmPrinter::PrintSLEB128(int Value) const {
439 int Sign = Value >> (8 * sizeof(Value) - 1);
443 unsigned Byte = Value & 0x7f;
445 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
446 if (IsMore) Byte |= 0x80;
447 O << "0x" << std::hex << Byte << std::dec;
448 if (IsMore) O << ", ";
452 /// SizeSLEB128 - Compute the number of bytes required for a signed leb128
454 unsigned AsmPrinter::SizeSLEB128(int Value) {
456 int Sign = Value >> (8 * sizeof(Value) - 1);
460 unsigned Byte = Value & 0x7f;
462 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
463 Size += sizeof(int8_t);
468 //===--------------------------------------------------------------------===//
469 // Emission and print routines
472 /// PrintHex - Print a value as a hexidecimal value.
474 void AsmPrinter::PrintHex(int Value) const {
475 O << "0x" << std::hex << Value << std::dec;
478 /// EOL - Print a newline character to asm stream. If a comment is present
479 /// then it will be printed first. Comments should not contain '\n'.
480 void AsmPrinter::EOL() const {
483 void AsmPrinter::EOL(const std::string &Comment) const {
484 if (AsmVerbose && !Comment.empty()) {
486 << TAI->getCommentString()
493 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
494 /// unsigned leb128 value.
495 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
496 if (TAI->hasLEB128()) {
500 O << TAI->getData8bitsDirective();
505 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
506 /// signed leb128 value.
507 void AsmPrinter::EmitSLEB128Bytes(int Value) const {
508 if (TAI->hasLEB128()) {
512 O << TAI->getData8bitsDirective();
517 /// EmitInt8 - Emit a byte directive and value.
519 void AsmPrinter::EmitInt8(int Value) const {
520 O << TAI->getData8bitsDirective();
521 PrintHex(Value & 0xFF);
524 /// EmitInt16 - Emit a short directive and value.
526 void AsmPrinter::EmitInt16(int Value) const {
527 O << TAI->getData16bitsDirective();
528 PrintHex(Value & 0xFFFF);
531 /// EmitInt32 - Emit a long directive and value.
533 void AsmPrinter::EmitInt32(int Value) const {
534 O << TAI->getData32bitsDirective();
538 /// EmitInt64 - Emit a long long directive and value.
540 void AsmPrinter::EmitInt64(uint64_t Value) const {
541 if (TAI->getData64bitsDirective()) {
542 O << TAI->getData64bitsDirective();
545 if (TM.getTargetData()->isBigEndian()) {
546 EmitInt32(unsigned(Value >> 32)); O << "\n";
547 EmitInt32(unsigned(Value));
549 EmitInt32(unsigned(Value)); O << "\n";
550 EmitInt32(unsigned(Value >> 32));
555 /// toOctal - Convert the low order bits of X into an octal digit.
557 static inline char toOctal(int X) {
561 /// printStringChar - Print a char, escaped if necessary.
563 static void printStringChar(std::ostream &O, unsigned char C) {
566 } else if (C == '\\') {
568 } else if (isprint(C)) {
572 case '\b': O << "\\b"; break;
573 case '\f': O << "\\f"; break;
574 case '\n': O << "\\n"; break;
575 case '\r': O << "\\r"; break;
576 case '\t': O << "\\t"; break;
579 O << toOctal(C >> 6);
580 O << toOctal(C >> 3);
581 O << toOctal(C >> 0);
587 /// EmitString - Emit a string with quotes and a null terminator.
588 /// Special characters are emitted properly.
589 /// \literal (Eg. '\t') \endliteral
590 void AsmPrinter::EmitString(const std::string &String) const {
591 const char* AscizDirective = TAI->getAscizDirective();
595 O << TAI->getAsciiDirective();
597 for (unsigned i = 0, N = String.size(); i < N; ++i) {
598 unsigned char C = String[i];
599 printStringChar(O, C);
608 //===----------------------------------------------------------------------===//
610 // EmitAlignment - Emit an alignment directive to the specified power of
611 // two boundary. For example, if you pass in 3 here, you will get an 8
612 // byte alignment. If a global value is specified, and if that global has
613 // an explicit alignment requested, it will unconditionally override the
614 // alignment request. However, if ForcedAlignBits is specified, this value
615 // has final say: the ultimate alignment will be the max of ForcedAlignBits
616 // and the alignment computed with NumBits and the global.
620 // if (GV && GV->hasalignment) Align = GV->getalignment();
621 // Align = std::max(Align, ForcedAlignBits);
623 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
624 unsigned ForcedAlignBits, bool UseFillExpr,
625 unsigned FillValue) const {
626 if (GV && GV->getAlignment())
627 NumBits = Log2_32(GV->getAlignment());
628 NumBits = std::max(NumBits, ForcedAlignBits);
630 if (NumBits == 0) return; // No need to emit alignment.
631 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
632 O << TAI->getAlignDirective() << NumBits;
633 if (UseFillExpr) O << ",0x" << std::hex << FillValue << std::dec;
638 /// EmitZeros - Emit a block of zeros.
640 void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
642 if (TAI->getZeroDirective()) {
643 O << TAI->getZeroDirective() << NumZeros;
644 if (TAI->getZeroDirectiveSuffix())
645 O << TAI->getZeroDirectiveSuffix();
648 for (; NumZeros; --NumZeros)
649 O << TAI->getData8bitsDirective() << "0\n";
654 // Print out the specified constant, without a storage class. Only the
655 // constants valid in constant expressions can occur here.
656 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
657 if (CV->isNullValue() || isa<UndefValue>(CV))
659 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
660 O << CI->getZExtValue();
661 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
662 // This is a constant address for a global variable or function. Use the
663 // name of the variable or function as the address value, possibly
664 // decorating it with GlobalVarAddrPrefix/Suffix or
665 // FunctionAddrPrefix/Suffix (these all default to "" )
666 if (isa<Function>(GV)) {
667 O << TAI->getFunctionAddrPrefix()
668 << Mang->getValueName(GV)
669 << TAI->getFunctionAddrSuffix();
671 O << TAI->getGlobalVarAddrPrefix()
672 << Mang->getValueName(GV)
673 << TAI->getGlobalVarAddrSuffix();
675 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
676 const TargetData *TD = TM.getTargetData();
677 unsigned Opcode = CE->getOpcode();
679 case Instruction::GetElementPtr: {
680 // generate a symbolic expression for the byte address
681 const Constant *ptrVal = CE->getOperand(0);
682 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
683 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
687 EmitConstantValueOnly(ptrVal);
689 O << ") + " << Offset;
691 O << ") - " << -Offset;
693 EmitConstantValueOnly(ptrVal);
697 case Instruction::Trunc:
698 case Instruction::ZExt:
699 case Instruction::SExt:
700 case Instruction::FPTrunc:
701 case Instruction::FPExt:
702 case Instruction::UIToFP:
703 case Instruction::SIToFP:
704 case Instruction::FPToUI:
705 case Instruction::FPToSI:
706 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
708 case Instruction::BitCast:
709 return EmitConstantValueOnly(CE->getOperand(0));
711 case Instruction::IntToPtr: {
712 // Handle casts to pointers by changing them into casts to the appropriate
713 // integer type. This promotes constant folding and simplifies this code.
714 Constant *Op = CE->getOperand(0);
715 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
716 return EmitConstantValueOnly(Op);
720 case Instruction::PtrToInt: {
721 // Support only foldable casts to/from pointers that can be eliminated by
722 // changing the pointer to the appropriately sized integer type.
723 Constant *Op = CE->getOperand(0);
724 const Type *Ty = CE->getType();
726 // We can emit the pointer value into this slot if the slot is an
727 // integer slot greater or equal to the size of the pointer.
728 if (Ty->isInteger() &&
729 TD->getTypeSize(Ty) >= TD->getTypeSize(Op->getType()))
730 return EmitConstantValueOnly(Op);
732 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
733 EmitConstantValueOnly(Op);
736 case Instruction::Add:
737 case Instruction::Sub:
739 EmitConstantValueOnly(CE->getOperand(0));
740 O << (Opcode==Instruction::Add ? ") + (" : ") - (");
741 EmitConstantValueOnly(CE->getOperand(1));
745 assert(0 && "Unsupported operator!");
748 assert(0 && "Unknown constant value!");
752 /// printAsCString - Print the specified array as a C compatible string, only if
753 /// the predicate isString is true.
755 static void printAsCString(std::ostream &O, const ConstantArray *CVA,
757 assert(CVA->isString() && "Array is not string compatible!");
760 for (unsigned i = 0; i != LastElt; ++i) {
762 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
763 printStringChar(O, C);
768 /// EmitString - Emit a zero-byte-terminated string constant.
770 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
771 unsigned NumElts = CVA->getNumOperands();
772 if (TAI->getAscizDirective() && NumElts &&
773 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
774 O << TAI->getAscizDirective();
775 printAsCString(O, CVA, NumElts-1);
777 O << TAI->getAsciiDirective();
778 printAsCString(O, CVA, NumElts);
783 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
785 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
786 const TargetData *TD = TM.getTargetData();
788 if (CV->isNullValue() || isa<UndefValue>(CV)) {
789 EmitZeros(TD->getTypeSize(CV->getType()));
791 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
792 if (CVA->isString()) {
794 } else { // Not a string. Print the values in successive locations
795 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
796 EmitGlobalConstant(CVA->getOperand(i));
799 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
800 // Print the fields in successive locations. Pad to align if needed!
801 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
802 uint64_t sizeSoFar = 0;
803 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
804 const Constant* field = CVS->getOperand(i);
806 // Check if padding is needed and insert one or more 0s.
807 uint64_t fieldSize = TD->getTypeSize(field->getType());
808 uint64_t padSize = ((i == e-1? cvsLayout->getSizeInBytes()
809 : cvsLayout->getElementOffset(i+1))
810 - cvsLayout->getElementOffset(i)) - fieldSize;
811 sizeSoFar += fieldSize + padSize;
813 // Now print the actual field value
814 EmitGlobalConstant(field);
816 // Insert the field padding unless it's zero bytes...
819 assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
820 "Layout of constant struct may be incorrect!");
822 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
823 // FP Constants are printed as integer constants to avoid losing
825 double Val = CFP->getValue();
826 if (CFP->getType() == Type::DoubleTy) {
827 if (TAI->getData64bitsDirective())
828 O << TAI->getData64bitsDirective() << DoubleToBits(Val) << "\t"
829 << TAI->getCommentString() << " double value: " << Val << "\n";
830 else if (TD->isBigEndian()) {
831 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
832 << "\t" << TAI->getCommentString()
833 << " double most significant word " << Val << "\n";
834 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
835 << "\t" << TAI->getCommentString()
836 << " double least significant word " << Val << "\n";
838 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
839 << "\t" << TAI->getCommentString()
840 << " double least significant word " << Val << "\n";
841 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
842 << "\t" << TAI->getCommentString()
843 << " double most significant word " << Val << "\n";
847 O << TAI->getData32bitsDirective() << FloatToBits(Val)
848 << "\t" << TAI->getCommentString() << " float " << Val << "\n";
851 } else if (CV->getType() == Type::Int64Ty) {
852 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
853 uint64_t Val = CI->getZExtValue();
855 if (TAI->getData64bitsDirective())
856 O << TAI->getData64bitsDirective() << Val << "\n";
857 else if (TD->isBigEndian()) {
858 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
859 << "\t" << TAI->getCommentString()
860 << " Double-word most significant word " << Val << "\n";
861 O << TAI->getData32bitsDirective() << unsigned(Val)
862 << "\t" << TAI->getCommentString()
863 << " Double-word least significant word " << Val << "\n";
865 O << TAI->getData32bitsDirective() << unsigned(Val)
866 << "\t" << TAI->getCommentString()
867 << " Double-word least significant word " << Val << "\n";
868 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
869 << "\t" << TAI->getCommentString()
870 << " Double-word most significant word " << Val << "\n";
874 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
875 const VectorType *PTy = CP->getType();
877 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
878 EmitGlobalConstant(CP->getOperand(I));
883 const Type *type = CV->getType();
884 printDataDirective(type);
885 EmitConstantValueOnly(CV);
890 AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
891 // Target doesn't support this yet!
895 /// PrintSpecial - Print information related to the specified machine instr
896 /// that is independent of the operand, and may be independent of the instr
897 /// itself. This can be useful for portably encoding the comment character
898 /// or other bits of target-specific knowledge into the asmstrings. The
899 /// syntax used is ${:comment}. Targets can override this to add support
900 /// for their own strange codes.
901 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
902 if (!strcmp(Code, "private")) {
903 O << TAI->getPrivateGlobalPrefix();
904 } else if (!strcmp(Code, "comment")) {
905 O << TAI->getCommentString();
906 } else if (!strcmp(Code, "uid")) {
907 // Assign a unique ID to this machine instruction.
908 static const MachineInstr *LastMI = 0;
909 static const Function *F = 0;
910 static unsigned Counter = 0U-1;
912 // Comparing the address of MI isn't sufficient, because machineinstrs may
913 // be allocated to the same address across functions.
914 const Function *ThisF = MI->getParent()->getParent()->getFunction();
916 // If this is a new machine instruction, bump the counter.
917 if (LastMI != MI || F != ThisF) {
924 cerr << "Unknown special formatter '" << Code
925 << "' for machine instr: " << *MI;
931 /// printInlineAsm - This method formats and prints the specified machine
932 /// instruction that is an inline asm.
933 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
934 unsigned NumOperands = MI->getNumOperands();
936 // Count the number of register definitions.
937 unsigned NumDefs = 0;
938 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
940 assert(NumDefs != NumOperands-1 && "No asm string?");
942 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
944 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
945 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
947 // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
948 if (AsmStr[0] == 0) {
949 O << "\n"; // Tab already printed, avoid double indenting next instr.
953 O << TAI->getInlineAsmStart() << "\n\t";
955 // The variant of the current asmprinter.
956 int AsmPrinterVariant = TAI->getAssemblerDialect();
958 int CurVariant = -1; // The number of the {.|.|.} region we are in.
959 const char *LastEmitted = AsmStr; // One past the last character emitted.
961 while (*LastEmitted) {
962 switch (*LastEmitted) {
964 // Not a special case, emit the string section literally.
965 const char *LiteralEnd = LastEmitted+1;
966 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
967 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
969 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
970 O.write(LastEmitted, LiteralEnd-LastEmitted);
971 LastEmitted = LiteralEnd;
975 ++LastEmitted; // Consume newline character.
976 O << "\n"; // Indent code with newline.
979 ++LastEmitted; // Consume '$' character.
983 switch (*LastEmitted) {
984 default: Done = false; break;
986 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
988 ++LastEmitted; // Consume second '$' character.
990 case '(': // $( -> same as GCC's { character.
991 ++LastEmitted; // Consume '(' character.
992 if (CurVariant != -1) {
993 cerr << "Nested variants found in inline asm string: '"
997 CurVariant = 0; // We're in the first variant now.
1000 ++LastEmitted; // consume '|' character.
1001 if (CurVariant == -1) {
1002 cerr << "Found '|' character outside of variant in inline asm "
1003 << "string: '" << AsmStr << "'\n";
1006 ++CurVariant; // We're in the next variant.
1008 case ')': // $) -> same as GCC's } char.
1009 ++LastEmitted; // consume ')' character.
1010 if (CurVariant == -1) {
1011 cerr << "Found '}' character outside of variant in inline asm "
1012 << "string: '" << AsmStr << "'\n";
1020 bool HasCurlyBraces = false;
1021 if (*LastEmitted == '{') { // ${variable}
1022 ++LastEmitted; // Consume '{' character.
1023 HasCurlyBraces = true;
1026 const char *IDStart = LastEmitted;
1029 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1030 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1031 cerr << "Bad $ operand number in inline asm string: '"
1035 LastEmitted = IDEnd;
1037 char Modifier[2] = { 0, 0 };
1039 if (HasCurlyBraces) {
1040 // If we have curly braces, check for a modifier character. This
1041 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1042 if (*LastEmitted == ':') {
1043 ++LastEmitted; // Consume ':' character.
1044 if (*LastEmitted == 0) {
1045 cerr << "Bad ${:} expression in inline asm string: '"
1050 Modifier[0] = *LastEmitted;
1051 ++LastEmitted; // Consume modifier character.
1054 if (*LastEmitted != '}') {
1055 cerr << "Bad ${} expression in inline asm string: '"
1059 ++LastEmitted; // Consume '}' character.
1062 if ((unsigned)Val >= NumOperands-1) {
1063 cerr << "Invalid $ operand number in inline asm string: '"
1068 // Okay, we finally have a value number. Ask the target to print this
1070 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1075 // Scan to find the machine operand number for the operand.
1076 for (; Val; --Val) {
1077 if (OpNo >= MI->getNumOperands()) break;
1078 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1079 OpNo += (OpFlags >> 3) + 1;
1082 if (OpNo >= MI->getNumOperands()) {
1085 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1086 ++OpNo; // Skip over the ID number.
1088 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1089 if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
1090 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1091 Modifier[0] ? Modifier : 0);
1093 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1094 Modifier[0] ? Modifier : 0);
1098 cerr << "Invalid operand found in inline asm: '"
1108 O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
1111 /// printLabel - This method prints a local label used by debug and
1112 /// exception handling tables.
1113 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1115 << TAI->getPrivateGlobalPrefix()
1117 << MI->getOperand(0).getImmedValue()
1121 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1122 /// instruction, using the specified assembler variant. Targets should
1123 /// overried this to format as appropriate.
1124 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1125 unsigned AsmVariant, const char *ExtraCode) {
1126 // Target doesn't support this yet!
1130 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1131 unsigned AsmVariant,
1132 const char *ExtraCode) {
1133 // Target doesn't support this yet!
1137 /// printBasicBlockLabel - This method prints the label for the specified
1138 /// MachineBasicBlock
1139 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1141 bool printComment) const {
1142 O << TAI->getPrivateGlobalPrefix() << "BB" << FunctionNumber << "_"
1143 << MBB->getNumber();
1146 if (printComment && MBB->getBasicBlock())
1147 O << '\t' << TAI->getCommentString() << ' '
1148 << MBB->getBasicBlock()->getName();
1151 /// printSetLabel - This method prints a set label for the specified
1152 /// MachineBasicBlock
1153 void AsmPrinter::printSetLabel(unsigned uid,
1154 const MachineBasicBlock *MBB) const {
1155 if (!TAI->getSetDirective())
1158 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1159 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1160 printBasicBlockLabel(MBB, false, false);
1161 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1162 << '_' << uid << '\n';
1165 void AsmPrinter::printSetLabel(unsigned uid, unsigned uid2,
1166 const MachineBasicBlock *MBB) const {
1167 if (!TAI->getSetDirective())
1170 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1171 << getFunctionNumber() << '_' << uid << '_' << uid2
1172 << "_set_" << MBB->getNumber() << ',';
1173 printBasicBlockLabel(MBB, false, false);
1174 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1175 << '_' << uid << '_' << uid2 << '\n';
1178 /// printDataDirective - This method prints the asm directive for the
1180 void AsmPrinter::printDataDirective(const Type *type) {
1181 const TargetData *TD = TM.getTargetData();
1182 switch (type->getTypeID()) {
1183 case Type::IntegerTyID: {
1184 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1186 O << TAI->getData8bitsDirective();
1187 else if (BitWidth <= 16)
1188 O << TAI->getData16bitsDirective();
1189 else if (BitWidth <= 32)
1190 O << TAI->getData32bitsDirective();
1191 else if (BitWidth <= 64) {
1192 assert(TAI->getData64bitsDirective() &&
1193 "Target cannot handle 64-bit constant exprs!");
1194 O << TAI->getData64bitsDirective();
1198 case Type::PointerTyID:
1199 if (TD->getPointerSize() == 8) {
1200 assert(TAI->getData64bitsDirective() &&
1201 "Target cannot handle 64-bit pointer exprs!");
1202 O << TAI->getData64bitsDirective();
1204 O << TAI->getData32bitsDirective();
1207 case Type::FloatTyID: case Type::DoubleTyID:
1208 assert (0 && "Should have already output floating point constant.");
1210 assert (0 && "Can't handle printing this type of thing");