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 AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm,
36 const TargetAsmInfo *T)
37 : FunctionNumber(0), O(o), TM(tm), TAI(T)
40 std::string AsmPrinter::getSectionForFunction(const Function &F) const {
41 return TAI->getTextSection();
45 /// SwitchToTextSection - Switch to the specified text section of the executable
46 /// if we are not already in it!
48 void AsmPrinter::SwitchToTextSection(const char *NewSection,
49 const GlobalValue *GV) {
51 if (GV && GV->hasSection())
52 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
56 // If we're already in this section, we're done.
57 if (CurrentSection == NS) return;
59 // Close the current section, if applicable.
60 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
61 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
65 if (!CurrentSection.empty())
66 O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
69 /// SwitchToDataSection - Switch to the specified data section of the executable
70 /// if we are not already in it!
72 void AsmPrinter::SwitchToDataSection(const char *NewSection,
73 const GlobalValue *GV) {
75 if (GV && GV->hasSection())
76 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
80 // If we're already in this section, we're done.
81 if (CurrentSection == NS) return;
83 // Close the current section, if applicable.
84 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
85 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
89 if (!CurrentSection.empty())
90 O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
94 bool AsmPrinter::doInitialization(Module &M) {
95 Mang = new Mangler(M, TAI->getGlobalPrefix());
97 if (!M.getModuleInlineAsm().empty())
98 O << TAI->getCommentString() << " Start of file scope inline assembly\n"
99 << M.getModuleInlineAsm()
100 << "\n" << TAI->getCommentString()
101 << " End of file scope inline assembly\n";
103 SwitchToDataSection(""); // Reset back to no section.
105 if (MachineModuleInfo *MMI = getAnalysisToUpdate<MachineModuleInfo>()) {
106 MMI->AnalyzeModule(M);
112 bool AsmPrinter::doFinalization(Module &M) {
113 if (TAI->getWeakRefDirective()) {
114 if (!ExtWeakSymbols.empty())
115 SwitchToDataSection("");
117 for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(),
118 e = ExtWeakSymbols.end(); i != e; ++i) {
119 const GlobalValue *GV = *i;
120 std::string Name = Mang->getValueName(GV);
121 O << TAI->getWeakRefDirective() << Name << "\n";
125 if (TAI->getSetDirective()) {
126 if (!M.alias_empty())
127 SwitchToTextSection(TAI->getTextSection());
130 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
132 std::string Name = Mang->getValueName(I);
135 if (const GlobalValue *GV = I->getAliasedGlobal())
136 Target = Mang->getValueName(GV);
138 assert(0 && "Unsupported aliasee");
140 if (I->hasExternalLinkage())
141 O << "\t.globl\t" << Name << "\n";
142 else if (I->hasWeakLinkage())
143 O << TAI->getWeakRefDirective() << Name << "\n";
144 else if (!I->hasInternalLinkage())
145 assert(0 && "Invalid alias linkage");
147 O << TAI->getSetDirective() << Name << ", " << Target << "\n";
151 delete Mang; Mang = 0;
155 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
156 // What's my mangled name?
157 CurrentFnName = Mang->getValueName(MF.getFunction());
158 IncrementFunctionNumber();
161 /// EmitConstantPool - Print to the current output stream assembly
162 /// representations of the constants in the constant pool MCP. This is
163 /// used to print out constants which have been "spilled to memory" by
164 /// the code generator.
166 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
167 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
168 if (CP.empty()) return;
170 // Some targets require 4-, 8-, and 16- byte constant literals to be placed
171 // in special sections.
172 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
173 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
174 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
175 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
176 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
177 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
178 MachineConstantPoolEntry CPE = CP[i];
179 const Type *Ty = CPE.getType();
180 if (TAI->getFourByteConstantSection() &&
181 TM.getTargetData()->getTypeSize(Ty) == 4)
182 FourByteCPs.push_back(std::make_pair(CPE, i));
183 else if (TAI->getEightByteConstantSection() &&
184 TM.getTargetData()->getTypeSize(Ty) == 8)
185 EightByteCPs.push_back(std::make_pair(CPE, i));
186 else if (TAI->getSixteenByteConstantSection() &&
187 TM.getTargetData()->getTypeSize(Ty) == 16)
188 SixteenByteCPs.push_back(std::make_pair(CPE, i));
190 OtherCPs.push_back(std::make_pair(CPE, i));
193 unsigned Alignment = MCP->getConstantPoolAlignment();
194 EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
195 EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
196 EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
198 EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
201 void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
202 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
203 if (CP.empty()) return;
205 SwitchToDataSection(Section);
206 EmitAlignment(Alignment);
207 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
208 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
209 << CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << " ";
210 WriteTypeSymbolic(O, CP[i].first.getType(), 0) << '\n';
211 if (CP[i].first.isMachineConstantPoolEntry())
212 EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
214 EmitGlobalConstant(CP[i].first.Val.ConstVal);
216 const Type *Ty = CP[i].first.getType();
218 TM.getTargetData()->getTypeSize(Ty);
219 unsigned ValEnd = CP[i].first.getOffset() + EntSize;
220 // Emit inter-object padding for alignment.
221 EmitZeros(CP[i+1].first.getOffset()-ValEnd);
226 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
227 /// by the current function to the current output stream.
229 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
230 MachineFunction &MF) {
231 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
232 if (JT.empty()) return;
233 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
235 // Use JumpTableDirective otherwise honor the entry size from the jump table
237 const char *JTEntryDirective = TAI->getJumpTableDirective();
238 bool HadJTEntryDirective = JTEntryDirective != NULL;
239 if (!HadJTEntryDirective) {
240 JTEntryDirective = MJTI->getEntrySize() == 4 ?
241 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
244 // Pick the directive to use to print the jump table entries, and switch to
245 // the appropriate section.
246 TargetLowering *LoweringInfo = TM.getTargetLowering();
248 const char* JumpTableDataSection = TAI->getJumpTableDataSection();
249 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
250 !JumpTableDataSection) {
251 // In PIC mode, we need to emit the jump table to the same section as the
252 // function body itself, otherwise the label differences won't make sense.
253 // We should also do if the section name is NULL.
254 const Function *F = MF.getFunction();
255 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
257 SwitchToDataSection(JumpTableDataSection);
260 EmitAlignment(Log2_32(MJTI->getAlignment()));
262 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
263 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
265 // If this jump table was deleted, ignore it.
266 if (JTBBs.empty()) continue;
268 // For PIC codegen, if possible we want to use the SetDirective to reduce
269 // the number of relocations the assembler will generate for the jump table.
270 // Set directives are all printed before the jump table itself.
271 std::set<MachineBasicBlock*> EmittedSets;
272 if (TAI->getSetDirective() && IsPic)
273 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
274 if (EmittedSets.insert(JTBBs[ii]).second)
275 printSetLabel(i, JTBBs[ii]);
277 // On some targets (e.g. darwin) we want to emit two consequtive labels
278 // before each jump table. The first label is never referenced, but tells
279 // the assembler and linker the extents of the jump table object. The
280 // second label is actually referenced by the code.
281 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
282 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
284 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
285 << '_' << i << ":\n";
287 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
288 O << JTEntryDirective << ' ';
289 // If we have emitted set directives for the jump table entries, print
290 // them rather than the entries themselves. If we're emitting PIC, then
291 // emit the table entries as differences between two text section labels.
292 // If we're emitting non-PIC code, then emit the entries as direct
293 // references to the target basic blocks.
294 if (!EmittedSets.empty()) {
295 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
296 << '_' << i << "_set_" << JTBBs[ii]->getNumber();
298 printBasicBlockLabel(JTBBs[ii], false, false);
299 // If the arch uses custom Jump Table directives, don't calc relative to
301 if (!HadJTEntryDirective)
302 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
303 << getFunctionNumber() << '_' << i;
305 printBasicBlockLabel(JTBBs[ii], false, false);
312 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
313 /// special global used by LLVM. If so, emit it and return true, otherwise
314 /// do nothing and return false.
315 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
316 // Ignore debug and non-emitted data.
317 if (GV->getSection() == "llvm.metadata") return true;
319 if (!GV->hasAppendingLinkage()) return false;
321 assert(GV->hasInitializer() && "Not a special LLVM global!");
323 if (GV->getName() == "llvm.used") {
324 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
325 EmitLLVMUsedList(GV->getInitializer());
329 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
330 SwitchToDataSection(TAI->getStaticCtorsSection());
332 EmitXXStructorList(GV->getInitializer());
336 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
337 SwitchToDataSection(TAI->getStaticDtorsSection());
339 EmitXXStructorList(GV->getInitializer());
346 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
347 /// global in the specified llvm.used list as being used with this directive.
348 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
349 const char *Directive = TAI->getUsedDirective();
351 // Should be an array of 'sbyte*'.
352 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
353 if (InitList == 0) return;
355 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
357 EmitConstantValueOnly(InitList->getOperand(i));
362 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
363 /// function pointers, ignoring the init priority.
364 void AsmPrinter::EmitXXStructorList(Constant *List) {
365 // Should be an array of '{ int, void ()* }' structs. The first value is the
366 // init priority, which we ignore.
367 if (!isa<ConstantArray>(List)) return;
368 ConstantArray *InitList = cast<ConstantArray>(List);
369 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
370 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
371 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
373 if (CS->getOperand(1)->isNullValue())
374 return; // Found a null terminator, exit printing.
375 // Emit the function pointer.
376 EmitGlobalConstant(CS->getOperand(1));
380 /// getGlobalLinkName - Returns the asm/link name of of the specified
381 /// global variable. Should be overridden by each target asm printer to
382 /// generate the appropriate value.
383 const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
384 std::string LinkName;
386 if (isa<Function>(GV)) {
387 LinkName += TAI->getFunctionAddrPrefix();
388 LinkName += Mang->getValueName(GV);
389 LinkName += TAI->getFunctionAddrSuffix();
391 LinkName += TAI->getGlobalVarAddrPrefix();
392 LinkName += Mang->getValueName(GV);
393 LinkName += TAI->getGlobalVarAddrSuffix();
399 /// EmitExternalGlobal - Emit the external reference to a global variable.
400 /// Should be overridden if an indirect reference should be used.
401 void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
402 O << getGlobalLinkName(GV);
407 //===----------------------------------------------------------------------===//
408 /// LEB 128 number encoding.
410 /// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
411 /// representing an unsigned leb128 value.
412 void AsmPrinter::PrintULEB128(unsigned Value) const {
414 unsigned Byte = Value & 0x7f;
416 if (Value) Byte |= 0x80;
417 O << "0x" << std::hex << Byte << std::dec;
418 if (Value) O << ", ";
422 /// SizeULEB128 - Compute the number of bytes required for an unsigned leb128
424 unsigned AsmPrinter::SizeULEB128(unsigned Value) {
428 Size += sizeof(int8_t);
433 /// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
434 /// representing a signed leb128 value.
435 void AsmPrinter::PrintSLEB128(int Value) const {
436 int Sign = Value >> (8 * sizeof(Value) - 1);
440 unsigned Byte = Value & 0x7f;
442 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
443 if (IsMore) Byte |= 0x80;
444 O << "0x" << std::hex << Byte << std::dec;
445 if (IsMore) O << ", ";
449 /// SizeSLEB128 - Compute the number of bytes required for a signed leb128
451 unsigned AsmPrinter::SizeSLEB128(int Value) {
453 int Sign = Value >> (8 * sizeof(Value) - 1);
457 unsigned Byte = Value & 0x7f;
459 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
460 Size += sizeof(int8_t);
465 //===--------------------------------------------------------------------===//
466 // Emission and print routines
469 /// PrintHex - Print a value as a hexidecimal value.
471 void AsmPrinter::PrintHex(int Value) const {
472 O << "0x" << std::hex << Value << std::dec;
475 /// EOL - Print a newline character to asm stream. If a comment is present
476 /// then it will be printed first. Comments should not contain '\n'.
477 void AsmPrinter::EOL() const {
480 void AsmPrinter::EOL(const std::string &Comment) const {
481 if (AsmVerbose && !Comment.empty()) {
483 << TAI->getCommentString()
490 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
491 /// unsigned leb128 value.
492 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
493 if (TAI->hasLEB128()) {
497 O << TAI->getData8bitsDirective();
502 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
503 /// signed leb128 value.
504 void AsmPrinter::EmitSLEB128Bytes(int Value) const {
505 if (TAI->hasLEB128()) {
509 O << TAI->getData8bitsDirective();
514 /// EmitInt8 - Emit a byte directive and value.
516 void AsmPrinter::EmitInt8(int Value) const {
517 O << TAI->getData8bitsDirective();
518 PrintHex(Value & 0xFF);
521 /// EmitInt16 - Emit a short directive and value.
523 void AsmPrinter::EmitInt16(int Value) const {
524 O << TAI->getData16bitsDirective();
525 PrintHex(Value & 0xFFFF);
528 /// EmitInt32 - Emit a long directive and value.
530 void AsmPrinter::EmitInt32(int Value) const {
531 O << TAI->getData32bitsDirective();
535 /// EmitInt64 - Emit a long long directive and value.
537 void AsmPrinter::EmitInt64(uint64_t Value) const {
538 if (TAI->getData64bitsDirective()) {
539 O << TAI->getData64bitsDirective();
542 if (TM.getTargetData()->isBigEndian()) {
543 EmitInt32(unsigned(Value >> 32)); O << "\n";
544 EmitInt32(unsigned(Value));
546 EmitInt32(unsigned(Value)); O << "\n";
547 EmitInt32(unsigned(Value >> 32));
552 /// toOctal - Convert the low order bits of X into an octal digit.
554 static inline char toOctal(int X) {
558 /// printStringChar - Print a char, escaped if necessary.
560 static void printStringChar(std::ostream &O, unsigned char C) {
563 } else if (C == '\\') {
565 } else if (isprint(C)) {
569 case '\b': O << "\\b"; break;
570 case '\f': O << "\\f"; break;
571 case '\n': O << "\\n"; break;
572 case '\r': O << "\\r"; break;
573 case '\t': O << "\\t"; break;
576 O << toOctal(C >> 6);
577 O << toOctal(C >> 3);
578 O << toOctal(C >> 0);
584 /// EmitString - Emit a string with quotes and a null terminator.
585 /// Special characters are emitted properly.
586 /// \literal (Eg. '\t') \endliteral
587 void AsmPrinter::EmitString(const std::string &String) const {
588 const char* AscizDirective = TAI->getAscizDirective();
592 O << TAI->getAsciiDirective();
594 for (unsigned i = 0, N = String.size(); i < N; ++i) {
595 unsigned char C = String[i];
596 printStringChar(O, C);
605 //===----------------------------------------------------------------------===//
607 // EmitAlignment - Emit an alignment directive to the specified power of two.
608 // Use the maximum of the specified alignment and the alignment from the
609 // specified GlobalValue (if any).
610 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
611 if (GV && GV->getAlignment())
612 NumBits = std::max(NumBits, Log2_32(GV->getAlignment()));
613 if (NumBits == 0) return; // No need to emit alignment.
614 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
615 O << TAI->getAlignDirective() << NumBits << "\n";
619 /// EmitZeros - Emit a block of zeros.
621 void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
623 if (TAI->getZeroDirective()) {
624 O << TAI->getZeroDirective() << NumZeros;
625 if (TAI->getZeroDirectiveSuffix())
626 O << TAI->getZeroDirectiveSuffix();
629 for (; NumZeros; --NumZeros)
630 O << TAI->getData8bitsDirective() << "0\n";
635 // Print out the specified constant, without a storage class. Only the
636 // constants valid in constant expressions can occur here.
637 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
638 if (CV->isNullValue() || isa<UndefValue>(CV))
640 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
641 O << CI->getZExtValue();
642 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
643 // This is a constant address for a global variable or function. Use the
644 // name of the variable or function as the address value, possibly
645 // decorating it with GlobalVarAddrPrefix/Suffix or
646 // FunctionAddrPrefix/Suffix (these all default to "" )
647 if (isa<Function>(GV)) {
648 O << TAI->getFunctionAddrPrefix()
649 << Mang->getValueName(GV)
650 << TAI->getFunctionAddrSuffix();
652 O << TAI->getGlobalVarAddrPrefix()
653 << Mang->getValueName(GV)
654 << TAI->getGlobalVarAddrSuffix();
656 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
657 const TargetData *TD = TM.getTargetData();
658 unsigned Opcode = CE->getOpcode();
660 case Instruction::GetElementPtr: {
661 // generate a symbolic expression for the byte address
662 const Constant *ptrVal = CE->getOperand(0);
663 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
664 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
668 EmitConstantValueOnly(ptrVal);
670 O << ") + " << Offset;
672 O << ") - " << -Offset;
674 EmitConstantValueOnly(ptrVal);
678 case Instruction::Trunc:
679 case Instruction::ZExt:
680 case Instruction::SExt:
681 case Instruction::FPTrunc:
682 case Instruction::FPExt:
683 case Instruction::UIToFP:
684 case Instruction::SIToFP:
685 case Instruction::FPToUI:
686 case Instruction::FPToSI:
687 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
689 case Instruction::BitCast:
690 return EmitConstantValueOnly(CE->getOperand(0));
692 case Instruction::IntToPtr: {
693 // Handle casts to pointers by changing them into casts to the appropriate
694 // integer type. This promotes constant folding and simplifies this code.
695 Constant *Op = CE->getOperand(0);
696 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
697 return EmitConstantValueOnly(Op);
701 case Instruction::PtrToInt: {
702 // Support only foldable casts to/from pointers that can be eliminated by
703 // changing the pointer to the appropriately sized integer type.
704 Constant *Op = CE->getOperand(0);
705 const Type *Ty = CE->getType();
707 // We can emit the pointer value into this slot if the slot is an
708 // integer slot greater or equal to the size of the pointer.
709 if (Ty->isInteger() &&
710 TD->getTypeSize(Ty) >= TD->getTypeSize(Op->getType()))
711 return EmitConstantValueOnly(Op);
713 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
714 EmitConstantValueOnly(Op);
717 case Instruction::Add:
718 case Instruction::Sub:
720 EmitConstantValueOnly(CE->getOperand(0));
721 O << (Opcode==Instruction::Add ? ") + (" : ") - (");
722 EmitConstantValueOnly(CE->getOperand(1));
726 assert(0 && "Unsupported operator!");
729 assert(0 && "Unknown constant value!");
733 /// printAsCString - Print the specified array as a C compatible string, only if
734 /// the predicate isString is true.
736 static void printAsCString(std::ostream &O, const ConstantArray *CVA,
738 assert(CVA->isString() && "Array is not string compatible!");
741 for (unsigned i = 0; i != LastElt; ++i) {
743 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
744 printStringChar(O, C);
749 /// EmitString - Emit a zero-byte-terminated string constant.
751 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
752 unsigned NumElts = CVA->getNumOperands();
753 if (TAI->getAscizDirective() && NumElts &&
754 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
755 O << TAI->getAscizDirective();
756 printAsCString(O, CVA, NumElts-1);
758 O << TAI->getAsciiDirective();
759 printAsCString(O, CVA, NumElts);
764 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
766 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
767 const TargetData *TD = TM.getTargetData();
769 if (CV->isNullValue() || isa<UndefValue>(CV)) {
770 EmitZeros(TD->getTypeSize(CV->getType()));
772 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
773 if (CVA->isString()) {
775 } else { // Not a string. Print the values in successive locations
776 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
777 EmitGlobalConstant(CVA->getOperand(i));
780 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
781 // Print the fields in successive locations. Pad to align if needed!
782 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
783 uint64_t sizeSoFar = 0;
784 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
785 const Constant* field = CVS->getOperand(i);
787 // Check if padding is needed and insert one or more 0s.
788 uint64_t fieldSize = TD->getTypeSize(field->getType());
789 uint64_t padSize = ((i == e-1? cvsLayout->getSizeInBytes()
790 : cvsLayout->getElementOffset(i+1))
791 - cvsLayout->getElementOffset(i)) - fieldSize;
792 sizeSoFar += fieldSize + padSize;
794 // Now print the actual field value
795 EmitGlobalConstant(field);
797 // Insert the field padding unless it's zero bytes...
800 assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
801 "Layout of constant struct may be incorrect!");
803 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
804 // FP Constants are printed as integer constants to avoid losing
806 double Val = CFP->getValue();
807 if (CFP->getType() == Type::DoubleTy) {
808 if (TAI->getData64bitsDirective())
809 O << TAI->getData64bitsDirective() << DoubleToBits(Val) << "\t"
810 << TAI->getCommentString() << " double value: " << Val << "\n";
811 else if (TD->isBigEndian()) {
812 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
813 << "\t" << TAI->getCommentString()
814 << " double most significant word " << Val << "\n";
815 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
816 << "\t" << TAI->getCommentString()
817 << " double least significant word " << Val << "\n";
819 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
820 << "\t" << TAI->getCommentString()
821 << " double least significant word " << Val << "\n";
822 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
823 << "\t" << TAI->getCommentString()
824 << " double most significant word " << Val << "\n";
828 O << TAI->getData32bitsDirective() << FloatToBits(Val)
829 << "\t" << TAI->getCommentString() << " float " << Val << "\n";
832 } else if (CV->getType() == Type::Int64Ty) {
833 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
834 uint64_t Val = CI->getZExtValue();
836 if (TAI->getData64bitsDirective())
837 O << TAI->getData64bitsDirective() << Val << "\n";
838 else if (TD->isBigEndian()) {
839 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
840 << "\t" << TAI->getCommentString()
841 << " Double-word most significant word " << Val << "\n";
842 O << TAI->getData32bitsDirective() << unsigned(Val)
843 << "\t" << TAI->getCommentString()
844 << " Double-word least significant word " << Val << "\n";
846 O << TAI->getData32bitsDirective() << unsigned(Val)
847 << "\t" << TAI->getCommentString()
848 << " Double-word least significant word " << Val << "\n";
849 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
850 << "\t" << TAI->getCommentString()
851 << " Double-word most significant word " << Val << "\n";
855 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
856 const VectorType *PTy = CP->getType();
858 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
859 EmitGlobalConstant(CP->getOperand(I));
864 const Type *type = CV->getType();
865 printDataDirective(type);
866 EmitConstantValueOnly(CV);
871 AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
872 // Target doesn't support this yet!
876 /// PrintSpecial - Print information related to the specified machine instr
877 /// that is independent of the operand, and may be independent of the instr
878 /// itself. This can be useful for portably encoding the comment character
879 /// or other bits of target-specific knowledge into the asmstrings. The
880 /// syntax used is ${:comment}. Targets can override this to add support
881 /// for their own strange codes.
882 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
883 if (!strcmp(Code, "private")) {
884 O << TAI->getPrivateGlobalPrefix();
885 } else if (!strcmp(Code, "comment")) {
886 O << TAI->getCommentString();
887 } else if (!strcmp(Code, "uid")) {
888 // Assign a unique ID to this machine instruction.
889 static const MachineInstr *LastMI = 0;
890 static const Function *F = 0;
891 static unsigned Counter = 0U-1;
893 // Comparing the address of MI isn't sufficient, because machineinstrs may
894 // be allocated to the same address across functions.
895 const Function *ThisF = MI->getParent()->getParent()->getFunction();
897 // If this is a new machine instruction, bump the counter.
898 if (LastMI != MI || F != ThisF) {
905 cerr << "Unknown special formatter '" << Code
906 << "' for machine instr: " << *MI;
912 /// printInlineAsm - This method formats and prints the specified machine
913 /// instruction that is an inline asm.
914 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
915 unsigned NumOperands = MI->getNumOperands();
917 // Count the number of register definitions.
918 unsigned NumDefs = 0;
919 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
921 assert(NumDefs != NumOperands-1 && "No asm string?");
923 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
925 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
926 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
928 // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
929 if (AsmStr[0] == 0) {
930 O << "\n"; // Tab already printed, avoid double indenting next instr.
934 O << TAI->getInlineAsmStart() << "\n\t";
936 // The variant of the current asmprinter.
937 int AsmPrinterVariant = TAI->getAssemblerDialect();
939 int CurVariant = -1; // The number of the {.|.|.} region we are in.
940 const char *LastEmitted = AsmStr; // One past the last character emitted.
942 while (*LastEmitted) {
943 switch (*LastEmitted) {
945 // Not a special case, emit the string section literally.
946 const char *LiteralEnd = LastEmitted+1;
947 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
948 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
950 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
951 O.write(LastEmitted, LiteralEnd-LastEmitted);
952 LastEmitted = LiteralEnd;
956 ++LastEmitted; // Consume newline character.
957 O << "\n\t"; // Indent code with newline.
960 ++LastEmitted; // Consume '$' character.
964 switch (*LastEmitted) {
965 default: Done = false; break;
967 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
969 ++LastEmitted; // Consume second '$' character.
971 case '(': // $( -> same as GCC's { character.
972 ++LastEmitted; // Consume '(' character.
973 if (CurVariant != -1) {
974 cerr << "Nested variants found in inline asm string: '"
978 CurVariant = 0; // We're in the first variant now.
981 ++LastEmitted; // consume '|' character.
982 if (CurVariant == -1) {
983 cerr << "Found '|' character outside of variant in inline asm "
984 << "string: '" << AsmStr << "'\n";
987 ++CurVariant; // We're in the next variant.
989 case ')': // $) -> same as GCC's } char.
990 ++LastEmitted; // consume ')' character.
991 if (CurVariant == -1) {
992 cerr << "Found '}' character outside of variant in inline asm "
993 << "string: '" << AsmStr << "'\n";
1001 bool HasCurlyBraces = false;
1002 if (*LastEmitted == '{') { // ${variable}
1003 ++LastEmitted; // Consume '{' character.
1004 HasCurlyBraces = true;
1007 const char *IDStart = LastEmitted;
1010 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1011 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1012 cerr << "Bad $ operand number in inline asm string: '"
1016 LastEmitted = IDEnd;
1018 char Modifier[2] = { 0, 0 };
1020 if (HasCurlyBraces) {
1021 // If we have curly braces, check for a modifier character. This
1022 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1023 if (*LastEmitted == ':') {
1024 ++LastEmitted; // Consume ':' character.
1025 if (*LastEmitted == 0) {
1026 cerr << "Bad ${:} expression in inline asm string: '"
1031 Modifier[0] = *LastEmitted;
1032 ++LastEmitted; // Consume modifier character.
1035 if (*LastEmitted != '}') {
1036 cerr << "Bad ${} expression in inline asm string: '"
1040 ++LastEmitted; // Consume '}' character.
1043 if ((unsigned)Val >= NumOperands-1) {
1044 cerr << "Invalid $ operand number in inline asm string: '"
1049 // Okay, we finally have a value number. Ask the target to print this
1051 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1056 // Scan to find the machine operand number for the operand.
1057 for (; Val; --Val) {
1058 if (OpNo >= MI->getNumOperands()) break;
1059 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1060 OpNo += (OpFlags >> 3) + 1;
1063 if (OpNo >= MI->getNumOperands()) {
1066 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1067 ++OpNo; // Skip over the ID number.
1069 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1070 if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
1071 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1072 Modifier[0] ? Modifier : 0);
1074 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1075 Modifier[0] ? Modifier : 0);
1079 cerr << "Invalid operand found in inline asm: '"
1089 O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
1092 /// printLabel - This method prints a local label used by debug and
1093 /// exception handling tables.
1094 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1096 << TAI->getPrivateGlobalPrefix()
1098 << MI->getOperand(0).getImmedValue()
1102 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1103 /// instruction, using the specified assembler variant. Targets should
1104 /// overried this to format as appropriate.
1105 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1106 unsigned AsmVariant, const char *ExtraCode) {
1107 // Target doesn't support this yet!
1111 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1112 unsigned AsmVariant,
1113 const char *ExtraCode) {
1114 // Target doesn't support this yet!
1118 /// printBasicBlockLabel - This method prints the label for the specified
1119 /// MachineBasicBlock
1120 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1122 bool printComment) const {
1123 O << TAI->getPrivateGlobalPrefix() << "BB" << FunctionNumber << "_"
1124 << MBB->getNumber();
1127 if (printComment && MBB->getBasicBlock())
1128 O << '\t' << TAI->getCommentString() << MBB->getBasicBlock()->getName();
1131 /// printSetLabel - This method prints a set label for the specified
1132 /// MachineBasicBlock
1133 void AsmPrinter::printSetLabel(unsigned uid,
1134 const MachineBasicBlock *MBB) const {
1135 if (!TAI->getSetDirective())
1138 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1139 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1140 printBasicBlockLabel(MBB, false, false);
1141 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1142 << '_' << uid << '\n';
1145 void AsmPrinter::printSetLabel(unsigned uid, unsigned uid2,
1146 const MachineBasicBlock *MBB) const {
1147 if (!TAI->getSetDirective())
1150 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1151 << getFunctionNumber() << '_' << uid << '_' << uid2
1152 << "_set_" << MBB->getNumber() << ',';
1153 printBasicBlockLabel(MBB, false, false);
1154 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1155 << '_' << uid << '_' << uid2 << '\n';
1158 /// printDataDirective - This method prints the asm directive for the
1160 void AsmPrinter::printDataDirective(const Type *type) {
1161 const TargetData *TD = TM.getTargetData();
1162 switch (type->getTypeID()) {
1163 case Type::IntegerTyID: {
1164 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1166 O << TAI->getData8bitsDirective();
1167 else if (BitWidth <= 16)
1168 O << TAI->getData16bitsDirective();
1169 else if (BitWidth <= 32)
1170 O << TAI->getData32bitsDirective();
1171 else if (BitWidth <= 64) {
1172 assert(TAI->getData64bitsDirective() &&
1173 "Target cannot handle 64-bit constant exprs!");
1174 O << TAI->getData64bitsDirective();
1178 case Type::PointerTyID:
1179 if (TD->getPointerSize() == 8) {
1180 assert(TAI->getData64bitsDirective() &&
1181 "Target cannot handle 64-bit pointer exprs!");
1182 O << TAI->getData64bitsDirective();
1184 O << TAI->getData32bitsDirective();
1187 case Type::FloatTyID: case Type::DoubleTyID:
1188 assert (0 && "Should have already output floating point constant.");
1190 assert (0 && "Can't handle printing this type of thing");