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 const int 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 // Ignore debug and non-emitted data.
318 if (GV->getSection() == "llvm.metadata") return true;
320 if (!GV->hasAppendingLinkage()) return false;
322 assert(GV->hasInitializer() && "Not a special LLVM global!");
324 if (GV->getName() == "llvm.used") {
325 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
326 EmitLLVMUsedList(GV->getInitializer());
330 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
331 SwitchToDataSection(TAI->getStaticCtorsSection());
333 EmitXXStructorList(GV->getInitializer());
337 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
338 SwitchToDataSection(TAI->getStaticDtorsSection());
340 EmitXXStructorList(GV->getInitializer());
347 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
348 /// global in the specified llvm.used list as being used with this directive.
349 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
350 const char *Directive = TAI->getUsedDirective();
352 // Should be an array of 'sbyte*'.
353 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
354 if (InitList == 0) return;
356 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
358 EmitConstantValueOnly(InitList->getOperand(i));
363 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
364 /// function pointers, ignoring the init priority.
365 void AsmPrinter::EmitXXStructorList(Constant *List) {
366 // Should be an array of '{ int, void ()* }' structs. The first value is the
367 // init priority, which we ignore.
368 if (!isa<ConstantArray>(List)) return;
369 ConstantArray *InitList = cast<ConstantArray>(List);
370 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
371 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
372 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
374 if (CS->getOperand(1)->isNullValue())
375 return; // Found a null terminator, exit printing.
376 // Emit the function pointer.
377 EmitGlobalConstant(CS->getOperand(1));
381 /// getGlobalLinkName - Returns the asm/link name of of the specified
382 /// global variable. Should be overridden by each target asm printer to
383 /// generate the appropriate value.
384 const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
385 std::string LinkName;
387 if (isa<Function>(GV)) {
388 LinkName += TAI->getFunctionAddrPrefix();
389 LinkName += Mang->getValueName(GV);
390 LinkName += TAI->getFunctionAddrSuffix();
392 LinkName += TAI->getGlobalVarAddrPrefix();
393 LinkName += Mang->getValueName(GV);
394 LinkName += TAI->getGlobalVarAddrSuffix();
400 /// EmitExternalGlobal - Emit the external reference to a global variable.
401 /// Should be overridden if an indirect reference should be used.
402 void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
403 O << getGlobalLinkName(GV);
408 //===----------------------------------------------------------------------===//
409 /// LEB 128 number encoding.
411 /// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
412 /// representing an unsigned leb128 value.
413 void AsmPrinter::PrintULEB128(unsigned Value) const {
415 unsigned Byte = Value & 0x7f;
417 if (Value) Byte |= 0x80;
418 O << "0x" << std::hex << Byte << std::dec;
419 if (Value) O << ", ";
423 /// SizeULEB128 - Compute the number of bytes required for an unsigned leb128
425 unsigned AsmPrinter::SizeULEB128(unsigned Value) {
429 Size += sizeof(int8_t);
434 /// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
435 /// representing a signed leb128 value.
436 void AsmPrinter::PrintSLEB128(int Value) const {
437 int Sign = Value >> (8 * sizeof(Value) - 1);
441 unsigned Byte = Value & 0x7f;
443 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
444 if (IsMore) Byte |= 0x80;
445 O << "0x" << std::hex << Byte << std::dec;
446 if (IsMore) O << ", ";
450 /// SizeSLEB128 - Compute the number of bytes required for a signed leb128
452 unsigned AsmPrinter::SizeSLEB128(int Value) {
454 int Sign = Value >> (8 * sizeof(Value) - 1);
458 unsigned Byte = Value & 0x7f;
460 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
461 Size += sizeof(int8_t);
466 //===--------------------------------------------------------------------===//
467 // Emission and print routines
470 /// PrintHex - Print a value as a hexidecimal value.
472 void AsmPrinter::PrintHex(int Value) const {
473 O << "0x" << std::hex << Value << std::dec;
476 /// EOL - Print a newline character to asm stream. If a comment is present
477 /// then it will be printed first. Comments should not contain '\n'.
478 void AsmPrinter::EOL() const {
481 void AsmPrinter::EOL(const std::string &Comment) const {
482 if (AsmVerbose && !Comment.empty()) {
484 << TAI->getCommentString()
491 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
492 /// unsigned leb128 value.
493 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
494 if (TAI->hasLEB128()) {
498 O << TAI->getData8bitsDirective();
503 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
504 /// signed leb128 value.
505 void AsmPrinter::EmitSLEB128Bytes(int Value) const {
506 if (TAI->hasLEB128()) {
510 O << TAI->getData8bitsDirective();
515 /// EmitInt8 - Emit a byte directive and value.
517 void AsmPrinter::EmitInt8(int Value) const {
518 O << TAI->getData8bitsDirective();
519 PrintHex(Value & 0xFF);
522 /// EmitInt16 - Emit a short directive and value.
524 void AsmPrinter::EmitInt16(int Value) const {
525 O << TAI->getData16bitsDirective();
526 PrintHex(Value & 0xFFFF);
529 /// EmitInt32 - Emit a long directive and value.
531 void AsmPrinter::EmitInt32(int Value) const {
532 O << TAI->getData32bitsDirective();
536 /// EmitInt64 - Emit a long long directive and value.
538 void AsmPrinter::EmitInt64(uint64_t Value) const {
539 if (TAI->getData64bitsDirective()) {
540 O << TAI->getData64bitsDirective();
543 if (TM.getTargetData()->isBigEndian()) {
544 EmitInt32(unsigned(Value >> 32)); O << "\n";
545 EmitInt32(unsigned(Value));
547 EmitInt32(unsigned(Value)); O << "\n";
548 EmitInt32(unsigned(Value >> 32));
553 /// toOctal - Convert the low order bits of X into an octal digit.
555 static inline char toOctal(int X) {
559 /// printStringChar - Print a char, escaped if necessary.
561 static void printStringChar(std::ostream &O, unsigned char C) {
564 } else if (C == '\\') {
566 } else if (isprint(C)) {
570 case '\b': O << "\\b"; break;
571 case '\f': O << "\\f"; break;
572 case '\n': O << "\\n"; break;
573 case '\r': O << "\\r"; break;
574 case '\t': O << "\\t"; break;
577 O << toOctal(C >> 6);
578 O << toOctal(C >> 3);
579 O << toOctal(C >> 0);
585 /// EmitString - Emit a string with quotes and a null terminator.
586 /// Special characters are emitted properly.
587 /// \literal (Eg. '\t') \endliteral
588 void AsmPrinter::EmitString(const std::string &String) const {
589 const char* AscizDirective = TAI->getAscizDirective();
593 O << TAI->getAsciiDirective();
595 for (unsigned i = 0, N = String.size(); i < N; ++i) {
596 unsigned char C = String[i];
597 printStringChar(O, C);
606 //===----------------------------------------------------------------------===//
608 // EmitAlignment - Emit an alignment directive to the specified power of two.
609 // Use the maximum of the specified alignment and the alignment from the
610 // specified GlobalValue (if any).
611 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
612 if (GV && GV->getAlignment())
613 NumBits = std::max(NumBits, Log2_32(GV->getAlignment()));
614 if (NumBits == 0) return; // No need to emit alignment.
615 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
616 O << TAI->getAlignDirective() << NumBits << "\n";
620 /// EmitZeros - Emit a block of zeros.
622 void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
624 if (TAI->getZeroDirective()) {
625 O << TAI->getZeroDirective() << NumZeros;
626 if (TAI->getZeroDirectiveSuffix())
627 O << TAI->getZeroDirectiveSuffix();
630 for (; NumZeros; --NumZeros)
631 O << TAI->getData8bitsDirective() << "0\n";
636 // Print out the specified constant, without a storage class. Only the
637 // constants valid in constant expressions can occur here.
638 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
639 if (CV->isNullValue() || isa<UndefValue>(CV))
641 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
642 O << CI->getZExtValue();
643 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
644 // This is a constant address for a global variable or function. Use the
645 // name of the variable or function as the address value, possibly
646 // decorating it with GlobalVarAddrPrefix/Suffix or
647 // FunctionAddrPrefix/Suffix (these all default to "" )
648 if (isa<Function>(GV)) {
649 O << TAI->getFunctionAddrPrefix()
650 << Mang->getValueName(GV)
651 << TAI->getFunctionAddrSuffix();
653 O << TAI->getGlobalVarAddrPrefix()
654 << Mang->getValueName(GV)
655 << TAI->getGlobalVarAddrSuffix();
657 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
658 const TargetData *TD = TM.getTargetData();
659 unsigned Opcode = CE->getOpcode();
661 case Instruction::GetElementPtr: {
662 // generate a symbolic expression for the byte address
663 const Constant *ptrVal = CE->getOperand(0);
664 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
665 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
669 EmitConstantValueOnly(ptrVal);
671 O << ") + " << Offset;
673 O << ") - " << -Offset;
675 EmitConstantValueOnly(ptrVal);
679 case Instruction::Trunc:
680 case Instruction::ZExt:
681 case Instruction::SExt:
682 case Instruction::FPTrunc:
683 case Instruction::FPExt:
684 case Instruction::UIToFP:
685 case Instruction::SIToFP:
686 case Instruction::FPToUI:
687 case Instruction::FPToSI:
688 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
690 case Instruction::BitCast:
691 return EmitConstantValueOnly(CE->getOperand(0));
693 case Instruction::IntToPtr: {
694 // Handle casts to pointers by changing them into casts to the appropriate
695 // integer type. This promotes constant folding and simplifies this code.
696 Constant *Op = CE->getOperand(0);
697 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
698 return EmitConstantValueOnly(Op);
702 case Instruction::PtrToInt: {
703 // Support only foldable casts to/from pointers that can be eliminated by
704 // changing the pointer to the appropriately sized integer type.
705 Constant *Op = CE->getOperand(0);
706 const Type *Ty = CE->getType();
708 // We can emit the pointer value into this slot if the slot is an
709 // integer slot greater or equal to the size of the pointer.
710 if (Ty->isInteger() &&
711 TD->getTypeSize(Ty) >= TD->getTypeSize(Op->getType()))
712 return EmitConstantValueOnly(Op);
714 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
715 EmitConstantValueOnly(Op);
718 case Instruction::Add:
719 case Instruction::Sub:
721 EmitConstantValueOnly(CE->getOperand(0));
722 O << (Opcode==Instruction::Add ? ") + (" : ") - (");
723 EmitConstantValueOnly(CE->getOperand(1));
727 assert(0 && "Unsupported operator!");
730 assert(0 && "Unknown constant value!");
734 /// printAsCString - Print the specified array as a C compatible string, only if
735 /// the predicate isString is true.
737 static void printAsCString(std::ostream &O, const ConstantArray *CVA,
739 assert(CVA->isString() && "Array is not string compatible!");
742 for (unsigned i = 0; i != LastElt; ++i) {
744 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
745 printStringChar(O, C);
750 /// EmitString - Emit a zero-byte-terminated string constant.
752 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
753 unsigned NumElts = CVA->getNumOperands();
754 if (TAI->getAscizDirective() && NumElts &&
755 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
756 O << TAI->getAscizDirective();
757 printAsCString(O, CVA, NumElts-1);
759 O << TAI->getAsciiDirective();
760 printAsCString(O, CVA, NumElts);
765 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
767 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
768 const TargetData *TD = TM.getTargetData();
770 if (CV->isNullValue() || isa<UndefValue>(CV)) {
771 EmitZeros(TD->getTypeSize(CV->getType()));
773 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
774 if (CVA->isString()) {
776 } else { // Not a string. Print the values in successive locations
777 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
778 EmitGlobalConstant(CVA->getOperand(i));
781 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
782 // Print the fields in successive locations. Pad to align if needed!
783 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
784 uint64_t sizeSoFar = 0;
785 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
786 const Constant* field = CVS->getOperand(i);
788 // Check if padding is needed and insert one or more 0s.
789 uint64_t fieldSize = TD->getTypeSize(field->getType());
790 uint64_t padSize = ((i == e-1? cvsLayout->getSizeInBytes()
791 : cvsLayout->getElementOffset(i+1))
792 - cvsLayout->getElementOffset(i)) - fieldSize;
793 sizeSoFar += fieldSize + padSize;
795 // Now print the actual field value
796 EmitGlobalConstant(field);
798 // Insert the field padding unless it's zero bytes...
801 assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
802 "Layout of constant struct may be incorrect!");
804 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
805 // FP Constants are printed as integer constants to avoid losing
807 double Val = CFP->getValue();
808 if (CFP->getType() == Type::DoubleTy) {
809 if (TAI->getData64bitsDirective())
810 O << TAI->getData64bitsDirective() << DoubleToBits(Val) << "\t"
811 << TAI->getCommentString() << " double value: " << Val << "\n";
812 else if (TD->isBigEndian()) {
813 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
814 << "\t" << TAI->getCommentString()
815 << " double most significant word " << Val << "\n";
816 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
817 << "\t" << TAI->getCommentString()
818 << " double least significant word " << Val << "\n";
820 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
821 << "\t" << TAI->getCommentString()
822 << " double least significant word " << Val << "\n";
823 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
824 << "\t" << TAI->getCommentString()
825 << " double most significant word " << Val << "\n";
829 O << TAI->getData32bitsDirective() << FloatToBits(Val)
830 << "\t" << TAI->getCommentString() << " float " << Val << "\n";
833 } else if (CV->getType() == Type::Int64Ty) {
834 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
835 uint64_t Val = CI->getZExtValue();
837 if (TAI->getData64bitsDirective())
838 O << TAI->getData64bitsDirective() << Val << "\n";
839 else if (TD->isBigEndian()) {
840 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
841 << "\t" << TAI->getCommentString()
842 << " Double-word most significant word " << Val << "\n";
843 O << TAI->getData32bitsDirective() << unsigned(Val)
844 << "\t" << TAI->getCommentString()
845 << " Double-word least significant word " << Val << "\n";
847 O << TAI->getData32bitsDirective() << unsigned(Val)
848 << "\t" << TAI->getCommentString()
849 << " Double-word least significant word " << Val << "\n";
850 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
851 << "\t" << TAI->getCommentString()
852 << " Double-word most significant word " << Val << "\n";
856 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
857 const VectorType *PTy = CP->getType();
859 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
860 EmitGlobalConstant(CP->getOperand(I));
865 const Type *type = CV->getType();
866 printDataDirective(type);
867 EmitConstantValueOnly(CV);
872 AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
873 // Target doesn't support this yet!
877 /// PrintSpecial - Print information related to the specified machine instr
878 /// that is independent of the operand, and may be independent of the instr
879 /// itself. This can be useful for portably encoding the comment character
880 /// or other bits of target-specific knowledge into the asmstrings. The
881 /// syntax used is ${:comment}. Targets can override this to add support
882 /// for their own strange codes.
883 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
884 if (!strcmp(Code, "private")) {
885 O << TAI->getPrivateGlobalPrefix();
886 } else if (!strcmp(Code, "comment")) {
887 O << TAI->getCommentString();
888 } else if (!strcmp(Code, "uid")) {
889 // Assign a unique ID to this machine instruction.
890 static const MachineInstr *LastMI = 0;
891 static const Function *F = 0;
892 static unsigned Counter = 0U-1;
894 // Comparing the address of MI isn't sufficient, because machineinstrs may
895 // be allocated to the same address across functions.
896 const Function *ThisF = MI->getParent()->getParent()->getFunction();
898 // If this is a new machine instruction, bump the counter.
899 if (LastMI != MI || F != ThisF) {
906 cerr << "Unknown special formatter '" << Code
907 << "' for machine instr: " << *MI;
913 /// printInlineAsm - This method formats and prints the specified machine
914 /// instruction that is an inline asm.
915 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
916 unsigned NumOperands = MI->getNumOperands();
918 // Count the number of register definitions.
919 unsigned NumDefs = 0;
920 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
922 assert(NumDefs != NumOperands-1 && "No asm string?");
924 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
926 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
927 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
929 // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
930 if (AsmStr[0] == 0) {
931 O << "\n"; // Tab already printed, avoid double indenting next instr.
935 O << TAI->getInlineAsmStart() << "\n\t";
937 // The variant of the current asmprinter.
938 int AsmPrinterVariant = TAI->getAssemblerDialect();
940 int CurVariant = -1; // The number of the {.|.|.} region we are in.
941 const char *LastEmitted = AsmStr; // One past the last character emitted.
943 while (*LastEmitted) {
944 switch (*LastEmitted) {
946 // Not a special case, emit the string section literally.
947 const char *LiteralEnd = LastEmitted+1;
948 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
949 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
951 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
952 O.write(LastEmitted, LiteralEnd-LastEmitted);
953 LastEmitted = LiteralEnd;
957 ++LastEmitted; // Consume newline character.
958 O << "\n"; // Indent code with newline.
961 ++LastEmitted; // Consume '$' character.
965 switch (*LastEmitted) {
966 default: Done = false; break;
968 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
970 ++LastEmitted; // Consume second '$' character.
972 case '(': // $( -> same as GCC's { character.
973 ++LastEmitted; // Consume '(' character.
974 if (CurVariant != -1) {
975 cerr << "Nested variants found in inline asm string: '"
979 CurVariant = 0; // We're in the first variant now.
982 ++LastEmitted; // consume '|' character.
983 if (CurVariant == -1) {
984 cerr << "Found '|' character outside of variant in inline asm "
985 << "string: '" << AsmStr << "'\n";
988 ++CurVariant; // We're in the next variant.
990 case ')': // $) -> same as GCC's } char.
991 ++LastEmitted; // consume ')' character.
992 if (CurVariant == -1) {
993 cerr << "Found '}' character outside of variant in inline asm "
994 << "string: '" << AsmStr << "'\n";
1002 bool HasCurlyBraces = false;
1003 if (*LastEmitted == '{') { // ${variable}
1004 ++LastEmitted; // Consume '{' character.
1005 HasCurlyBraces = true;
1008 const char *IDStart = LastEmitted;
1011 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1012 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1013 cerr << "Bad $ operand number in inline asm string: '"
1017 LastEmitted = IDEnd;
1019 char Modifier[2] = { 0, 0 };
1021 if (HasCurlyBraces) {
1022 // If we have curly braces, check for a modifier character. This
1023 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1024 if (*LastEmitted == ':') {
1025 ++LastEmitted; // Consume ':' character.
1026 if (*LastEmitted == 0) {
1027 cerr << "Bad ${:} expression in inline asm string: '"
1032 Modifier[0] = *LastEmitted;
1033 ++LastEmitted; // Consume modifier character.
1036 if (*LastEmitted != '}') {
1037 cerr << "Bad ${} expression in inline asm string: '"
1041 ++LastEmitted; // Consume '}' character.
1044 if ((unsigned)Val >= NumOperands-1) {
1045 cerr << "Invalid $ operand number in inline asm string: '"
1050 // Okay, we finally have a value number. Ask the target to print this
1052 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1057 // Scan to find the machine operand number for the operand.
1058 for (; Val; --Val) {
1059 if (OpNo >= MI->getNumOperands()) break;
1060 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1061 OpNo += (OpFlags >> 3) + 1;
1064 if (OpNo >= MI->getNumOperands()) {
1067 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1068 ++OpNo; // Skip over the ID number.
1070 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1071 if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
1072 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1073 Modifier[0] ? Modifier : 0);
1075 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1076 Modifier[0] ? Modifier : 0);
1080 cerr << "Invalid operand found in inline asm: '"
1090 O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
1093 /// printLabel - This method prints a local label used by debug and
1094 /// exception handling tables.
1095 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1097 << TAI->getPrivateGlobalPrefix()
1099 << MI->getOperand(0).getImmedValue()
1103 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1104 /// instruction, using the specified assembler variant. Targets should
1105 /// overried this to format as appropriate.
1106 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1107 unsigned AsmVariant, const char *ExtraCode) {
1108 // Target doesn't support this yet!
1112 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1113 unsigned AsmVariant,
1114 const char *ExtraCode) {
1115 // Target doesn't support this yet!
1119 /// printBasicBlockLabel - This method prints the label for the specified
1120 /// MachineBasicBlock
1121 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1123 bool printComment) const {
1124 O << TAI->getPrivateGlobalPrefix() << "BB" << FunctionNumber << "_"
1125 << MBB->getNumber();
1128 if (printComment && MBB->getBasicBlock())
1129 O << '\t' << TAI->getCommentString() << MBB->getBasicBlock()->getName();
1132 /// printSetLabel - This method prints a set label for the specified
1133 /// MachineBasicBlock
1134 void AsmPrinter::printSetLabel(unsigned uid,
1135 const MachineBasicBlock *MBB) const {
1136 if (!TAI->getSetDirective())
1139 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1140 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1141 printBasicBlockLabel(MBB, false, false);
1142 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1143 << '_' << uid << '\n';
1146 void AsmPrinter::printSetLabel(unsigned uid, unsigned uid2,
1147 const MachineBasicBlock *MBB) const {
1148 if (!TAI->getSetDirective())
1151 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1152 << getFunctionNumber() << '_' << uid << '_' << uid2
1153 << "_set_" << MBB->getNumber() << ',';
1154 printBasicBlockLabel(MBB, false, false);
1155 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1156 << '_' << uid << '_' << uid2 << '\n';
1159 /// printDataDirective - This method prints the asm directive for the
1161 void AsmPrinter::printDataDirective(const Type *type) {
1162 const TargetData *TD = TM.getTargetData();
1163 switch (type->getTypeID()) {
1164 case Type::IntegerTyID: {
1165 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1167 O << TAI->getData8bitsDirective();
1168 else if (BitWidth <= 16)
1169 O << TAI->getData16bitsDirective();
1170 else if (BitWidth <= 32)
1171 O << TAI->getData32bitsDirective();
1172 else if (BitWidth <= 64) {
1173 assert(TAI->getData64bitsDirective() &&
1174 "Target cannot handle 64-bit constant exprs!");
1175 O << TAI->getData64bitsDirective();
1179 case Type::PointerTyID:
1180 if (TD->getPointerSize() == 8) {
1181 assert(TAI->getData64bitsDirective() &&
1182 "Target cannot handle 64-bit pointer exprs!");
1183 O << TAI->getData64bitsDirective();
1185 O << TAI->getData32bitsDirective();
1188 case Type::FloatTyID: case Type::DoubleTyID:
1189 assert (0 && "Should have already output floating point constant.");
1191 assert (0 && "Can't handle printing this type of thing");