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.begin() != ExtWeakSymbols.end())
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 delete Mang; Mang = 0;
129 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
130 // What's my mangled name?
131 CurrentFnName = Mang->getValueName(MF.getFunction());
132 IncrementFunctionNumber();
135 /// EmitConstantPool - Print to the current output stream assembly
136 /// representations of the constants in the constant pool MCP. This is
137 /// used to print out constants which have been "spilled to memory" by
138 /// the code generator.
140 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
141 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
142 if (CP.empty()) return;
144 // Some targets require 4-, 8-, and 16- byte constant literals to be placed
145 // in special sections.
146 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
147 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
148 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
149 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
150 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
151 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
152 MachineConstantPoolEntry CPE = CP[i];
153 const Type *Ty = CPE.getType();
154 if (TAI->getFourByteConstantSection() &&
155 TM.getTargetData()->getTypeSize(Ty) == 4)
156 FourByteCPs.push_back(std::make_pair(CPE, i));
157 else if (TAI->getEightByteConstantSection() &&
158 TM.getTargetData()->getTypeSize(Ty) == 8)
159 EightByteCPs.push_back(std::make_pair(CPE, i));
160 else if (TAI->getSixteenByteConstantSection() &&
161 TM.getTargetData()->getTypeSize(Ty) == 16)
162 SixteenByteCPs.push_back(std::make_pair(CPE, i));
164 OtherCPs.push_back(std::make_pair(CPE, i));
167 unsigned Alignment = MCP->getConstantPoolAlignment();
168 EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
169 EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
170 EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
172 EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
175 void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
176 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
177 if (CP.empty()) return;
179 SwitchToDataSection(Section);
180 EmitAlignment(Alignment);
181 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
182 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
183 << CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << " ";
184 WriteTypeSymbolic(O, CP[i].first.getType(), 0) << '\n';
185 if (CP[i].first.isMachineConstantPoolEntry())
186 EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
188 EmitGlobalConstant(CP[i].first.Val.ConstVal);
190 const Type *Ty = CP[i].first.getType();
192 TM.getTargetData()->getTypeSize(Ty);
193 unsigned ValEnd = CP[i].first.getOffset() + EntSize;
194 // Emit inter-object padding for alignment.
195 EmitZeros(CP[i+1].first.getOffset()-ValEnd);
200 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
201 /// by the current function to the current output stream.
203 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
204 MachineFunction &MF) {
205 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
206 if (JT.empty()) return;
207 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
209 // Use JumpTableDirective otherwise honor the entry size from the jump table
211 const char *JTEntryDirective = TAI->getJumpTableDirective();
212 bool HadJTEntryDirective = JTEntryDirective != NULL;
213 if (!HadJTEntryDirective) {
214 JTEntryDirective = MJTI->getEntrySize() == 4 ?
215 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
218 // Pick the directive to use to print the jump table entries, and switch to
219 // the appropriate section.
220 TargetLowering *LoweringInfo = TM.getTargetLowering();
222 const char* JumpTableDataSection = TAI->getJumpTableDataSection();
223 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
224 !JumpTableDataSection) {
225 // In PIC mode, we need to emit the jump table to the same section as the
226 // function body itself, otherwise the label differences won't make sense.
227 // We should also do if the section name is NULL.
228 const Function *F = MF.getFunction();
229 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
231 SwitchToDataSection(JumpTableDataSection);
234 EmitAlignment(Log2_32(MJTI->getAlignment()));
236 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
237 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
239 // If this jump table was deleted, ignore it.
240 if (JTBBs.empty()) continue;
242 // For PIC codegen, if possible we want to use the SetDirective to reduce
243 // the number of relocations the assembler will generate for the jump table.
244 // Set directives are all printed before the jump table itself.
245 std::set<MachineBasicBlock*> EmittedSets;
246 if (TAI->getSetDirective() && IsPic)
247 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
248 if (EmittedSets.insert(JTBBs[ii]).second)
249 printSetLabel(i, JTBBs[ii]);
251 // On some targets (e.g. darwin) we want to emit two consequtive labels
252 // before each jump table. The first label is never referenced, but tells
253 // the assembler and linker the extents of the jump table object. The
254 // second label is actually referenced by the code.
255 if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
256 O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
258 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
259 << '_' << i << ":\n";
261 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
262 O << JTEntryDirective << ' ';
263 // If we have emitted set directives for the jump table entries, print
264 // them rather than the entries themselves. If we're emitting PIC, then
265 // emit the table entries as differences between two text section labels.
266 // If we're emitting non-PIC code, then emit the entries as direct
267 // references to the target basic blocks.
268 if (!EmittedSets.empty()) {
269 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
270 << '_' << i << "_set_" << JTBBs[ii]->getNumber();
272 printBasicBlockLabel(JTBBs[ii], false, false);
273 // If the arch uses custom Jump Table directives, don't calc relative to
275 if (!HadJTEntryDirective)
276 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
277 << getFunctionNumber() << '_' << i;
279 printBasicBlockLabel(JTBBs[ii], false, false);
286 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
287 /// special global used by LLVM. If so, emit it and return true, otherwise
288 /// do nothing and return false.
289 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
290 // Ignore debug and non-emitted data.
291 if (GV->getSection() == "llvm.metadata") return true;
293 if (!GV->hasAppendingLinkage()) return false;
295 assert(GV->hasInitializer() && "Not a special LLVM global!");
297 if (GV->getName() == "llvm.used") {
298 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
299 EmitLLVMUsedList(GV->getInitializer());
303 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
304 SwitchToDataSection(TAI->getStaticCtorsSection());
306 EmitXXStructorList(GV->getInitializer());
310 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
311 SwitchToDataSection(TAI->getStaticDtorsSection());
313 EmitXXStructorList(GV->getInitializer());
320 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
321 /// global in the specified llvm.used list as being used with this directive.
322 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
323 const char *Directive = TAI->getUsedDirective();
325 // Should be an array of 'sbyte*'.
326 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
327 if (InitList == 0) return;
329 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
331 EmitConstantValueOnly(InitList->getOperand(i));
336 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
337 /// function pointers, ignoring the init priority.
338 void AsmPrinter::EmitXXStructorList(Constant *List) {
339 // Should be an array of '{ int, void ()* }' structs. The first value is the
340 // init priority, which we ignore.
341 if (!isa<ConstantArray>(List)) return;
342 ConstantArray *InitList = cast<ConstantArray>(List);
343 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
344 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
345 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
347 if (CS->getOperand(1)->isNullValue())
348 return; // Found a null terminator, exit printing.
349 // Emit the function pointer.
350 EmitGlobalConstant(CS->getOperand(1));
354 /// getGlobalLinkName - Returns the asm/link name of of the specified
355 /// global variable. Should be overridden by each target asm printer to
356 /// generate the appropriate value.
357 const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
358 std::string LinkName;
360 if (isa<Function>(GV)) {
361 LinkName += TAI->getFunctionAddrPrefix();
362 LinkName += Mang->getValueName(GV);
363 LinkName += TAI->getFunctionAddrSuffix();
365 LinkName += TAI->getGlobalVarAddrPrefix();
366 LinkName += Mang->getValueName(GV);
367 LinkName += TAI->getGlobalVarAddrSuffix();
373 //===----------------------------------------------------------------------===//
374 /// LEB 128 number encoding.
376 /// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
377 /// representing an unsigned leb128 value.
378 void AsmPrinter::PrintULEB128(unsigned Value) const {
380 unsigned Byte = Value & 0x7f;
382 if (Value) Byte |= 0x80;
383 O << "0x" << std::hex << Byte << std::dec;
384 if (Value) O << ", ";
388 /// SizeULEB128 - Compute the number of bytes required for an unsigned leb128
390 unsigned AsmPrinter::SizeULEB128(unsigned Value) {
394 Size += sizeof(int8_t);
399 /// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
400 /// representing a signed leb128 value.
401 void AsmPrinter::PrintSLEB128(int Value) const {
402 int Sign = Value >> (8 * sizeof(Value) - 1);
406 unsigned Byte = Value & 0x7f;
408 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
409 if (IsMore) Byte |= 0x80;
410 O << "0x" << std::hex << Byte << std::dec;
411 if (IsMore) O << ", ";
415 /// SizeSLEB128 - Compute the number of bytes required for a signed leb128
417 unsigned AsmPrinter::SizeSLEB128(int Value) {
419 int Sign = Value >> (8 * sizeof(Value) - 1);
423 unsigned Byte = Value & 0x7f;
425 IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
426 Size += sizeof(int8_t);
431 //===--------------------------------------------------------------------===//
432 // Emission and print routines
435 /// PrintHex - Print a value as a hexidecimal value.
437 void AsmPrinter::PrintHex(int Value) const {
438 O << "0x" << std::hex << Value << std::dec;
441 /// EOL - Print a newline character to asm stream. If a comment is present
442 /// then it will be printed first. Comments should not contain '\n'.
443 void AsmPrinter::EOL(const std::string &Comment) const {
444 if (AsmVerbose && !Comment.empty()) {
446 << TAI->getCommentString()
453 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
454 /// unsigned leb128 value.
455 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
456 if (TAI->hasLEB128()) {
460 O << TAI->getData8bitsDirective();
465 /// EmitSLEB128Bytes - print an assembler byte data directive to compose a
466 /// signed leb128 value.
467 void AsmPrinter::EmitSLEB128Bytes(int Value) const {
468 if (TAI->hasLEB128()) {
472 O << TAI->getData8bitsDirective();
477 /// EmitInt8 - Emit a byte directive and value.
479 void AsmPrinter::EmitInt8(int Value) const {
480 O << TAI->getData8bitsDirective();
481 PrintHex(Value & 0xFF);
484 /// EmitInt16 - Emit a short directive and value.
486 void AsmPrinter::EmitInt16(int Value) const {
487 O << TAI->getData16bitsDirective();
488 PrintHex(Value & 0xFFFF);
491 /// EmitInt32 - Emit a long directive and value.
493 void AsmPrinter::EmitInt32(int Value) const {
494 O << TAI->getData32bitsDirective();
498 /// EmitInt64 - Emit a long long directive and value.
500 void AsmPrinter::EmitInt64(uint64_t Value) const {
501 if (TAI->getData64bitsDirective()) {
502 O << TAI->getData64bitsDirective();
505 if (TM.getTargetData()->isBigEndian()) {
506 EmitInt32(unsigned(Value >> 32)); O << "\n";
507 EmitInt32(unsigned(Value));
509 EmitInt32(unsigned(Value)); O << "\n";
510 EmitInt32(unsigned(Value >> 32));
515 /// toOctal - Convert the low order bits of X into an octal digit.
517 static inline char toOctal(int X) {
521 /// printStringChar - Print a char, escaped if necessary.
523 static void printStringChar(std::ostream &O, unsigned char C) {
526 } else if (C == '\\') {
528 } else if (isprint(C)) {
532 case '\b': O << "\\b"; break;
533 case '\f': O << "\\f"; break;
534 case '\n': O << "\\n"; break;
535 case '\r': O << "\\r"; break;
536 case '\t': O << "\\t"; break;
539 O << toOctal(C >> 6);
540 O << toOctal(C >> 3);
541 O << toOctal(C >> 0);
547 /// EmitString - Emit a string with quotes and a null terminator.
548 /// Special characters are emitted properly.
549 /// \literal (Eg. '\t') \endliteral
550 void AsmPrinter::EmitString(const std::string &String) const {
551 O << TAI->getAsciiDirective()
553 for (unsigned i = 0, N = String.size(); i < N; ++i) {
554 unsigned char C = String[i];
555 printStringChar(O, C);
561 //===----------------------------------------------------------------------===//
563 // EmitAlignment - Emit an alignment directive to the specified power of two.
564 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
565 if (GV && GV->getAlignment())
566 NumBits = Log2_32(GV->getAlignment());
567 if (NumBits == 0) return; // No need to emit alignment.
568 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
569 O << TAI->getAlignDirective() << NumBits << "\n";
572 /// EmitZeros - Emit a block of zeros.
574 void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
576 if (TAI->getZeroDirective()) {
577 O << TAI->getZeroDirective() << NumZeros;
578 if (TAI->getZeroDirectiveSuffix())
579 O << TAI->getZeroDirectiveSuffix();
582 for (; NumZeros; --NumZeros)
583 O << TAI->getData8bitsDirective() << "0\n";
588 // Print out the specified constant, without a storage class. Only the
589 // constants valid in constant expressions can occur here.
590 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
591 if (CV->isNullValue() || isa<UndefValue>(CV))
593 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
594 O << CI->getZExtValue();
595 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
596 // This is a constant address for a global variable or function. Use the
597 // name of the variable or function as the address value, possibly
598 // decorating it with GlobalVarAddrPrefix/Suffix or
599 // FunctionAddrPrefix/Suffix (these all default to "" )
600 if (isa<Function>(GV)) {
601 O << TAI->getFunctionAddrPrefix()
602 << Mang->getValueName(GV)
603 << TAI->getFunctionAddrSuffix();
605 O << TAI->getGlobalVarAddrPrefix()
606 << Mang->getValueName(GV)
607 << TAI->getGlobalVarAddrSuffix();
609 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
610 const TargetData *TD = TM.getTargetData();
611 unsigned Opcode = CE->getOpcode();
613 case Instruction::GetElementPtr: {
614 // generate a symbolic expression for the byte address
615 const Constant *ptrVal = CE->getOperand(0);
616 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
617 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
621 EmitConstantValueOnly(ptrVal);
623 O << ") + " << Offset;
625 O << ") - " << -Offset;
627 EmitConstantValueOnly(ptrVal);
631 case Instruction::Trunc:
632 case Instruction::ZExt:
633 case Instruction::SExt:
634 case Instruction::FPTrunc:
635 case Instruction::FPExt:
636 case Instruction::UIToFP:
637 case Instruction::SIToFP:
638 case Instruction::FPToUI:
639 case Instruction::FPToSI:
640 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
642 case Instruction::BitCast:
643 return EmitConstantValueOnly(CE->getOperand(0));
645 case Instruction::IntToPtr: {
646 // Handle casts to pointers by changing them into casts to the appropriate
647 // integer type. This promotes constant folding and simplifies this code.
648 Constant *Op = CE->getOperand(0);
649 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
650 return EmitConstantValueOnly(Op);
654 case Instruction::PtrToInt: {
655 // Support only foldable casts to/from pointers that can be eliminated by
656 // changing the pointer to the appropriately sized integer type.
657 Constant *Op = CE->getOperand(0);
658 const Type *Ty = CE->getType();
660 // We can emit the pointer value into this slot if the slot is an
661 // integer slot greater or equal to the size of the pointer.
662 if (Ty->isInteger() &&
663 TD->getTypeSize(Ty) >= TD->getTypeSize(Op->getType()))
664 return EmitConstantValueOnly(Op);
666 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
667 EmitConstantValueOnly(Op);
670 case Instruction::Add:
671 case Instruction::Sub:
673 EmitConstantValueOnly(CE->getOperand(0));
674 O << (Opcode==Instruction::Add ? ") + (" : ") - (");
675 EmitConstantValueOnly(CE->getOperand(1));
679 assert(0 && "Unsupported operator!");
682 assert(0 && "Unknown constant value!");
686 /// printAsCString - Print the specified array as a C compatible string, only if
687 /// the predicate isString is true.
689 static void printAsCString(std::ostream &O, const ConstantArray *CVA,
691 assert(CVA->isString() && "Array is not string compatible!");
694 for (unsigned i = 0; i != LastElt; ++i) {
696 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
697 printStringChar(O, C);
702 /// EmitString - Emit a zero-byte-terminated string constant.
704 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
705 unsigned NumElts = CVA->getNumOperands();
706 if (TAI->getAscizDirective() && NumElts &&
707 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
708 O << TAI->getAscizDirective();
709 printAsCString(O, CVA, NumElts-1);
711 O << TAI->getAsciiDirective();
712 printAsCString(O, CVA, NumElts);
717 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
719 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
720 const TargetData *TD = TM.getTargetData();
722 if (CV->isNullValue() || isa<UndefValue>(CV)) {
723 EmitZeros(TD->getTypeSize(CV->getType()));
725 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
726 if (CVA->isString()) {
728 } else { // Not a string. Print the values in successive locations
729 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
730 EmitGlobalConstant(CVA->getOperand(i));
733 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
734 // Print the fields in successive locations. Pad to align if needed!
735 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
736 uint64_t sizeSoFar = 0;
737 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
738 const Constant* field = CVS->getOperand(i);
740 // Check if padding is needed and insert one or more 0s.
741 uint64_t fieldSize = TD->getTypeSize(field->getType());
742 uint64_t padSize = ((i == e-1? cvsLayout->getSizeInBytes()
743 : cvsLayout->getElementOffset(i+1))
744 - cvsLayout->getElementOffset(i)) - fieldSize;
745 sizeSoFar += fieldSize + padSize;
747 // Now print the actual field value
748 EmitGlobalConstant(field);
750 // Insert the field padding unless it's zero bytes...
753 assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
754 "Layout of constant struct may be incorrect!");
756 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
757 // FP Constants are printed as integer constants to avoid losing
759 double Val = CFP->getValue();
760 if (CFP->getType() == Type::DoubleTy) {
761 if (TAI->getData64bitsDirective())
762 O << TAI->getData64bitsDirective() << DoubleToBits(Val) << "\t"
763 << TAI->getCommentString() << " double value: " << Val << "\n";
764 else if (TD->isBigEndian()) {
765 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
766 << "\t" << TAI->getCommentString()
767 << " double most significant word " << Val << "\n";
768 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
769 << "\t" << TAI->getCommentString()
770 << " double least significant word " << Val << "\n";
772 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
773 << "\t" << TAI->getCommentString()
774 << " double least significant word " << Val << "\n";
775 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
776 << "\t" << TAI->getCommentString()
777 << " double most significant word " << Val << "\n";
781 O << TAI->getData32bitsDirective() << FloatToBits(Val)
782 << "\t" << TAI->getCommentString() << " float " << Val << "\n";
785 } else if (CV->getType() == Type::Int64Ty) {
786 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
787 uint64_t Val = CI->getZExtValue();
789 if (TAI->getData64bitsDirective())
790 O << TAI->getData64bitsDirective() << Val << "\n";
791 else if (TD->isBigEndian()) {
792 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
793 << "\t" << TAI->getCommentString()
794 << " Double-word most significant word " << Val << "\n";
795 O << TAI->getData32bitsDirective() << unsigned(Val)
796 << "\t" << TAI->getCommentString()
797 << " Double-word least significant word " << Val << "\n";
799 O << TAI->getData32bitsDirective() << unsigned(Val)
800 << "\t" << TAI->getCommentString()
801 << " Double-word least significant word " << Val << "\n";
802 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
803 << "\t" << TAI->getCommentString()
804 << " Double-word most significant word " << Val << "\n";
808 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
809 const VectorType *PTy = CP->getType();
811 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
812 EmitGlobalConstant(CP->getOperand(I));
817 const Type *type = CV->getType();
818 printDataDirective(type);
819 EmitConstantValueOnly(CV);
824 AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
825 // Target doesn't support this yet!
829 /// PrintSpecial - Print information related to the specified machine instr
830 /// that is independent of the operand, and may be independent of the instr
831 /// itself. This can be useful for portably encoding the comment character
832 /// or other bits of target-specific knowledge into the asmstrings. The
833 /// syntax used is ${:comment}. Targets can override this to add support
834 /// for their own strange codes.
835 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
836 if (!strcmp(Code, "private")) {
837 O << TAI->getPrivateGlobalPrefix();
838 } else if (!strcmp(Code, "comment")) {
839 O << TAI->getCommentString();
840 } else if (!strcmp(Code, "uid")) {
841 // Assign a unique ID to this machine instruction.
842 static const MachineInstr *LastMI = 0;
843 static const Function *F = 0;
844 static unsigned Counter = 0U-1;
846 // Comparing the address of MI isn't sufficient, because machineinstrs may
847 // be allocated to the same address across functions.
848 const Function *ThisF = MI->getParent()->getParent()->getFunction();
850 // If this is a new machine instruction, bump the counter.
851 if (LastMI != MI || F != ThisF) {
858 cerr << "Unknown special formatter '" << Code
859 << "' for machine instr: " << *MI;
865 /// printInlineAsm - This method formats and prints the specified machine
866 /// instruction that is an inline asm.
867 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
868 unsigned NumOperands = MI->getNumOperands();
870 // Count the number of register definitions.
871 unsigned NumDefs = 0;
872 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
874 assert(NumDefs != NumOperands-1 && "No asm string?");
876 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
878 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
879 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
881 // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
882 if (AsmStr[0] == 0) {
883 O << "\n"; // Tab already printed, avoid double indenting next instr.
887 O << TAI->getInlineAsmStart() << "\n\t";
889 // The variant of the current asmprinter.
890 int AsmPrinterVariant = TAI->getAssemblerDialect();
892 int CurVariant = -1; // The number of the {.|.|.} region we are in.
893 const char *LastEmitted = AsmStr; // One past the last character emitted.
895 while (*LastEmitted) {
896 switch (*LastEmitted) {
898 // Not a special case, emit the string section literally.
899 const char *LiteralEnd = LastEmitted+1;
900 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
901 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
903 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
904 O.write(LastEmitted, LiteralEnd-LastEmitted);
905 LastEmitted = LiteralEnd;
909 ++LastEmitted; // Consume newline character.
910 O << "\n\t"; // Indent code with newline.
913 ++LastEmitted; // Consume '$' character.
917 switch (*LastEmitted) {
918 default: Done = false; break;
920 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
922 ++LastEmitted; // Consume second '$' character.
924 case '(': // $( -> same as GCC's { character.
925 ++LastEmitted; // Consume '(' character.
926 if (CurVariant != -1) {
927 cerr << "Nested variants found in inline asm string: '"
931 CurVariant = 0; // We're in the first variant now.
934 ++LastEmitted; // consume '|' character.
935 if (CurVariant == -1) {
936 cerr << "Found '|' character outside of variant in inline asm "
937 << "string: '" << AsmStr << "'\n";
940 ++CurVariant; // We're in the next variant.
942 case ')': // $) -> same as GCC's } char.
943 ++LastEmitted; // consume ')' character.
944 if (CurVariant == -1) {
945 cerr << "Found '}' character outside of variant in inline asm "
946 << "string: '" << AsmStr << "'\n";
954 bool HasCurlyBraces = false;
955 if (*LastEmitted == '{') { // ${variable}
956 ++LastEmitted; // Consume '{' character.
957 HasCurlyBraces = true;
960 const char *IDStart = LastEmitted;
963 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
964 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
965 cerr << "Bad $ operand number in inline asm string: '"
971 char Modifier[2] = { 0, 0 };
973 if (HasCurlyBraces) {
974 // If we have curly braces, check for a modifier character. This
975 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
976 if (*LastEmitted == ':') {
977 ++LastEmitted; // Consume ':' character.
978 if (*LastEmitted == 0) {
979 cerr << "Bad ${:} expression in inline asm string: '"
984 Modifier[0] = *LastEmitted;
985 ++LastEmitted; // Consume modifier character.
988 if (*LastEmitted != '}') {
989 cerr << "Bad ${} expression in inline asm string: '"
993 ++LastEmitted; // Consume '}' character.
996 if ((unsigned)Val >= NumOperands-1) {
997 cerr << "Invalid $ operand number in inline asm string: '"
1002 // Okay, we finally have a value number. Ask the target to print this
1004 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1009 // Scan to find the machine operand number for the operand.
1010 for (; Val; --Val) {
1011 if (OpNo >= MI->getNumOperands()) break;
1012 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1013 OpNo += (OpFlags >> 3) + 1;
1016 if (OpNo >= MI->getNumOperands()) {
1019 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
1020 ++OpNo; // Skip over the ID number.
1022 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1023 if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
1024 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1025 Modifier[0] ? Modifier : 0);
1027 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1028 Modifier[0] ? Modifier : 0);
1032 cerr << "Invalid operand found in inline asm: '"
1042 O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
1045 /// printLabel - This method prints a local label used by debug and
1046 /// exception handling tables.
1047 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1049 << TAI->getPrivateGlobalPrefix()
1051 << MI->getOperand(0).getImmedValue()
1055 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1056 /// instruction, using the specified assembler variant. Targets should
1057 /// overried this to format as appropriate.
1058 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1059 unsigned AsmVariant, const char *ExtraCode) {
1060 // Target doesn't support this yet!
1064 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1065 unsigned AsmVariant,
1066 const char *ExtraCode) {
1067 // Target doesn't support this yet!
1071 /// printBasicBlockLabel - This method prints the label for the specified
1072 /// MachineBasicBlock
1073 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1075 bool printComment) const {
1076 O << TAI->getPrivateGlobalPrefix() << "BB" << FunctionNumber << "_"
1077 << MBB->getNumber();
1080 if (printComment && MBB->getBasicBlock())
1081 O << '\t' << TAI->getCommentString() << MBB->getBasicBlock()->getName();
1084 /// printSetLabel - This method prints a set label for the specified
1085 /// MachineBasicBlock
1086 void AsmPrinter::printSetLabel(unsigned uid,
1087 const MachineBasicBlock *MBB) const {
1088 if (!TAI->getSetDirective())
1091 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1092 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1093 printBasicBlockLabel(MBB, false, false);
1094 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1095 << '_' << uid << '\n';
1098 void AsmPrinter::printSetLabel(unsigned uid, unsigned uid2,
1099 const MachineBasicBlock *MBB) const {
1100 if (!TAI->getSetDirective())
1103 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1104 << getFunctionNumber() << '_' << uid << '_' << uid2
1105 << "_set_" << MBB->getNumber() << ',';
1106 printBasicBlockLabel(MBB, false, false);
1107 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1108 << '_' << uid << '_' << uid2 << '\n';
1111 /// printDataDirective - This method prints the asm directive for the
1113 void AsmPrinter::printDataDirective(const Type *type) {
1114 const TargetData *TD = TM.getTargetData();
1115 switch (type->getTypeID()) {
1116 case Type::IntegerTyID: {
1117 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1119 O << TAI->getData8bitsDirective();
1120 else if (BitWidth <= 16)
1121 O << TAI->getData16bitsDirective();
1122 else if (BitWidth <= 32)
1123 O << TAI->getData32bitsDirective();
1124 else if (BitWidth <= 64) {
1125 assert(TAI->getData64bitsDirective() &&
1126 "Target cannot handle 64-bit constant exprs!");
1127 O << TAI->getData64bitsDirective();
1131 case Type::PointerTyID:
1132 if (TD->getPointerSize() == 8) {
1133 assert(TAI->getData64bitsDirective() &&
1134 "Target cannot handle 64-bit pointer exprs!");
1135 O << TAI->getData64bitsDirective();
1137 O << TAI->getData32bitsDirective();
1140 case Type::FloatTyID: case Type::DoubleTyID:
1141 assert (0 && "Should have already output floating point constant.");
1143 assert (0 && "Can't handle printing this type of thing");