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/Mangler.h"
22 #include "llvm/Support/MathExtras.h"
23 #include "llvm/Target/TargetData.h"
24 #include "llvm/Target/TargetMachine.h"
29 AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm)
30 : FunctionNumber(0), O(o), TM(tm),
33 PrivateGlobalPrefix("."),
34 GlobalVarAddrPrefix(""),
35 GlobalVarAddrSuffix(""),
36 FunctionAddrPrefix(""),
37 FunctionAddrSuffix(""),
38 InlineAsmStart("#APP"),
39 InlineAsmEnd("#NO_APP"),
40 ZeroDirective("\t.zero\t"),
41 ZeroDirectiveSuffix(0),
42 AsciiDirective("\t.ascii\t"),
43 AscizDirective("\t.asciz\t"),
44 Data8bitsDirective("\t.byte\t"),
45 Data16bitsDirective("\t.short\t"),
46 Data32bitsDirective("\t.long\t"),
47 Data64bitsDirective("\t.quad\t"),
48 AlignDirective("\t.align\t"),
49 AlignmentIsInBytes(true),
50 SwitchToSectionDirective("\t.section\t"),
51 TextSectionStartSuffix(""),
52 DataSectionStartSuffix(""),
53 SectionEndDirectiveSuffix(0),
54 ConstantPoolSection("\t.section .rodata\n"),
55 JumpTableDataSection("\t.section .rodata\n"),
56 JumpTableTextSection("\t.text\n"),
57 StaticCtorsSection("\t.section .ctors,\"aw\",@progbits"),
58 StaticDtorsSection("\t.section .dtors,\"aw\",@progbits"),
59 FourByteConstantSection(0),
60 EightByteConstantSection(0),
61 SixteenByteConstantSection(0),
63 COMMDirective("\t.comm\t"),
64 COMMDirectiveTakesAlignment(true),
65 HasDotTypeDotSizeDirective(true) {
69 /// SwitchToTextSection - Switch to the specified text section of the executable
70 /// if we are not already in it!
72 void AsmPrinter::SwitchToTextSection(const char *NewSection,
73 const GlobalValue *GV) {
75 if (GV && GV->hasSection())
76 NS = SwitchToSectionDirective + 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 (SectionEndDirectiveSuffix && !CurrentSection.empty())
85 O << CurrentSection << SectionEndDirectiveSuffix << "\n";
89 if (!CurrentSection.empty())
90 O << CurrentSection << TextSectionStartSuffix << '\n';
93 /// SwitchToDataSection - Switch to the specified data section of the executable
94 /// if we are not already in it!
96 void AsmPrinter::SwitchToDataSection(const char *NewSection,
97 const GlobalValue *GV) {
99 if (GV && GV->hasSection())
100 NS = SwitchToSectionDirective + GV->getSection();
104 // If we're already in this section, we're done.
105 if (CurrentSection == NS) return;
107 // Close the current section, if applicable.
108 if (SectionEndDirectiveSuffix && !CurrentSection.empty())
109 O << CurrentSection << SectionEndDirectiveSuffix << "\n";
113 if (!CurrentSection.empty())
114 O << CurrentSection << DataSectionStartSuffix << '\n';
118 bool AsmPrinter::doInitialization(Module &M) {
119 Mang = new Mangler(M, GlobalPrefix);
121 if (!M.getModuleInlineAsm().empty())
122 O << CommentString << " Start of file scope inline assembly\n"
123 << M.getModuleInlineAsm()
124 << "\n" << CommentString << " End of file scope inline assembly\n";
126 SwitchToDataSection("", 0); // Reset back to no section.
128 if (MachineDebugInfo *DebugInfo = getAnalysisToUpdate<MachineDebugInfo>()) {
129 DebugInfo->AnalyzeModule(M);
135 bool AsmPrinter::doFinalization(Module &M) {
136 delete Mang; Mang = 0;
140 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
141 // What's my mangled name?
142 CurrentFnName = Mang->getValueName(MF.getFunction());
143 IncrementFunctionNumber();
146 /// EmitConstantPool - Print to the current output stream assembly
147 /// representations of the constants in the constant pool MCP. This is
148 /// used to print out constants which have been "spilled to memory" by
149 /// the code generator.
151 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
152 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
153 if (CP.empty()) return;
155 // Some targets require 4-, 8-, and 16- byte constant literals to be placed
156 // in special sections.
157 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
158 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
159 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
160 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
161 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
162 MachineConstantPoolEntry CPE = CP[i];
163 const Constant *CV = CPE.Val;
164 const Type *Ty = CV->getType();
165 if (FourByteConstantSection &&
166 TM.getTargetData()->getTypeSize(Ty) == 4)
167 FourByteCPs.push_back(std::make_pair(CPE, i));
168 else if (EightByteConstantSection &&
169 TM.getTargetData()->getTypeSize(Ty) == 8)
170 EightByteCPs.push_back(std::make_pair(CPE, i));
171 else if (SixteenByteConstantSection &&
172 TM.getTargetData()->getTypeSize(Ty) == 16)
173 SixteenByteCPs.push_back(std::make_pair(CPE, i));
175 OtherCPs.push_back(std::make_pair(CPE, i));
178 unsigned Alignment = MCP->getConstantPoolAlignment();
179 EmitConstantPool(Alignment, FourByteConstantSection, FourByteCPs);
180 EmitConstantPool(Alignment, EightByteConstantSection, EightByteCPs);
181 EmitConstantPool(Alignment, SixteenByteConstantSection, SixteenByteCPs);
182 EmitConstantPool(Alignment, ConstantPoolSection, OtherCPs);
185 void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
186 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
187 if (CP.empty()) return;
189 SwitchToDataSection(Section, 0);
190 EmitAlignment(Alignment);
191 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
192 O << PrivateGlobalPrefix << "CPI" << getFunctionNumber() << '_'
193 << CP[i].second << ":\t\t\t\t\t" << CommentString << " ";
194 WriteTypeSymbolic(O, CP[i].first.Val->getType(), 0) << '\n';
195 EmitGlobalConstant(CP[i].first.Val);
198 TM.getTargetData()->getTypeSize(CP[i].first.Val->getType());
199 unsigned ValEnd = CP[i].first.Offset + EntSize;
200 // Emit inter-object padding for alignment.
201 EmitZeros(CP[i+1].first.Offset-ValEnd);
206 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
207 /// by the current function to the current output stream.
209 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI) {
210 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
211 if (JT.empty()) return;
212 const TargetData *TD = TM.getTargetData();
214 // JTEntryDirective is a string to print sizeof(ptr) for non-PIC jump tables,
215 // and 32 bits for PIC since PIC jump table entries are differences, not
216 // pointers to blocks.
217 const char *JTEntryDirective = Data32bitsDirective;
219 // Pick the directive to use to print the jump table entries, and switch to
220 // the appropriate section.
221 if (TM.getRelocationModel() == Reloc::PIC_) {
222 SwitchToTextSection(JumpTableTextSection, 0);
224 SwitchToDataSection(JumpTableDataSection, 0);
225 if (TD->getPointerSize() == 8)
226 JTEntryDirective = Data64bitsDirective;
228 EmitAlignment(Log2_32(TD->getPointerAlignment()));
230 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
231 O << PrivateGlobalPrefix << "JTI" << getFunctionNumber() << '_' << i
233 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
234 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
235 O << JTEntryDirective << ' ';
236 printBasicBlockLabel(JTBBs[ii], false, false);
237 if (TM.getRelocationModel() == Reloc::PIC_) {
238 O << '-' << PrivateGlobalPrefix << "JTI" << getFunctionNumber()
246 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
247 /// special global used by LLVM. If so, emit it and return true, otherwise
248 /// do nothing and return false.
249 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
250 // Ignore debug and non-emitted data.
251 if (GV->getSection() == "llvm.metadata") return true;
253 if (!GV->hasAppendingLinkage()) return false;
255 assert(GV->hasInitializer() && "Not a special LLVM global!");
257 if (GV->getName() == "llvm.used")
258 return true; // No need to emit this at all.
260 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
261 SwitchToDataSection(StaticCtorsSection, 0);
263 EmitXXStructorList(GV->getInitializer());
267 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
268 SwitchToDataSection(StaticDtorsSection, 0);
270 EmitXXStructorList(GV->getInitializer());
277 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
278 /// function pointers, ignoring the init priority.
279 void AsmPrinter::EmitXXStructorList(Constant *List) {
280 // Should be an array of '{ int, void ()* }' structs. The first value is the
281 // init priority, which we ignore.
282 if (!isa<ConstantArray>(List)) return;
283 ConstantArray *InitList = cast<ConstantArray>(List);
284 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
285 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
286 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
288 if (CS->getOperand(1)->isNullValue())
289 return; // Found a null terminator, exit printing.
290 // Emit the function pointer.
291 EmitGlobalConstant(CS->getOperand(1));
295 /// getPreferredAlignmentLog - Return the preferred alignment of the
296 /// specified global, returned in log form. This includes an explicitly
297 /// requested alignment (if the global has one).
298 unsigned AsmPrinter::getPreferredAlignmentLog(const GlobalVariable *GV) const {
299 const Type *ElemType = GV->getType()->getElementType();
300 unsigned Alignment = TM.getTargetData()->getTypeAlignmentShift(ElemType);
301 if (GV->getAlignment() > (1U << Alignment))
302 Alignment = Log2_32(GV->getAlignment());
304 if (GV->hasInitializer()) {
305 // Always round up alignment of global doubles to 8 bytes.
306 if (GV->getType()->getElementType() == Type::DoubleTy && Alignment < 3)
309 // If the global is not external, see if it is large. If so, give it a
311 if (TM.getTargetData()->getTypeSize(ElemType) > 128)
312 Alignment = 4; // 16-byte alignment.
318 // EmitAlignment - Emit an alignment directive to the specified power of two.
319 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
320 if (GV && GV->getAlignment())
321 NumBits = Log2_32(GV->getAlignment());
322 if (NumBits == 0) return; // No need to emit alignment.
323 if (AlignmentIsInBytes) NumBits = 1 << NumBits;
324 O << AlignDirective << NumBits << "\n";
327 /// EmitZeros - Emit a block of zeros.
329 void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
332 O << ZeroDirective << NumZeros;
333 if (ZeroDirectiveSuffix)
334 O << ZeroDirectiveSuffix;
337 for (; NumZeros; --NumZeros)
338 O << Data8bitsDirective << "0\n";
343 // Print out the specified constant, without a storage class. Only the
344 // constants valid in constant expressions can occur here.
345 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
346 if (CV->isNullValue() || isa<UndefValue>(CV))
348 else if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV)) {
349 assert(CB == ConstantBool::True);
351 } else if (const ConstantSInt *CI = dyn_cast<ConstantSInt>(CV))
352 if (((CI->getValue() << 32) >> 32) == CI->getValue())
355 O << (uint64_t)CI->getValue();
356 else if (const ConstantUInt *CI = dyn_cast<ConstantUInt>(CV))
358 else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
359 // This is a constant address for a global variable or function. Use the
360 // name of the variable or function as the address value, possibly
361 // decorating it with GlobalVarAddrPrefix/Suffix or
362 // FunctionAddrPrefix/Suffix (these all default to "" )
363 if (isa<Function>(GV))
364 O << FunctionAddrPrefix << Mang->getValueName(GV) << FunctionAddrSuffix;
366 O << GlobalVarAddrPrefix << Mang->getValueName(GV) << GlobalVarAddrSuffix;
367 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
368 const TargetData *TD = TM.getTargetData();
369 switch(CE->getOpcode()) {
370 case Instruction::GetElementPtr: {
371 // generate a symbolic expression for the byte address
372 const Constant *ptrVal = CE->getOperand(0);
373 std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
374 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), idxVec)) {
377 EmitConstantValueOnly(ptrVal);
379 O << ") + " << Offset;
381 O << ") - " << -Offset;
383 EmitConstantValueOnly(ptrVal);
387 case Instruction::Cast: {
388 // Support only foldable casts to/from pointers that can be eliminated by
389 // changing the pointer to the appropriately sized integer type.
390 Constant *Op = CE->getOperand(0);
391 const Type *OpTy = Op->getType(), *Ty = CE->getType();
393 // Handle casts to pointers by changing them into casts to the appropriate
394 // integer type. This promotes constant folding and simplifies this code.
395 if (isa<PointerType>(Ty)) {
396 const Type *IntPtrTy = TD->getIntPtrType();
397 Op = ConstantExpr::getCast(Op, IntPtrTy);
398 return EmitConstantValueOnly(Op);
401 // We know the dest type is not a pointer. Is the src value a pointer or
403 if (isa<PointerType>(OpTy) || OpTy->isIntegral()) {
404 // We can emit the pointer value into this slot if the slot is an
405 // integer slot greater or equal to the size of the pointer.
406 if (Ty->isIntegral() && TD->getTypeSize(Ty) >= TD->getTypeSize(OpTy))
407 return EmitConstantValueOnly(Op);
410 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
411 EmitConstantValueOnly(Op);
414 case Instruction::Add:
416 EmitConstantValueOnly(CE->getOperand(0));
418 EmitConstantValueOnly(CE->getOperand(1));
422 assert(0 && "Unsupported operator!");
425 assert(0 && "Unknown constant value!");
429 /// toOctal - Convert the low order bits of X into an octal digit.
431 static inline char toOctal(int X) {
435 /// printAsCString - Print the specified array as a C compatible string, only if
436 /// the predicate isString is true.
438 static void printAsCString(std::ostream &O, const ConstantArray *CVA,
440 assert(CVA->isString() && "Array is not string compatible!");
443 for (unsigned i = 0; i != LastElt; ++i) {
445 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getRawValue();
449 } else if (C == '\\') {
451 } else if (isprint(C)) {
455 case '\b': O << "\\b"; break;
456 case '\f': O << "\\f"; break;
457 case '\n': O << "\\n"; break;
458 case '\r': O << "\\r"; break;
459 case '\t': O << "\\t"; break;
462 O << toOctal(C >> 6);
463 O << toOctal(C >> 3);
464 O << toOctal(C >> 0);
472 /// EmitString - Emit a zero-byte-terminated string constant.
474 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
475 unsigned NumElts = CVA->getNumOperands();
476 if (AscizDirective && NumElts &&
477 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getRawValue() == 0) {
479 printAsCString(O, CVA, NumElts-1);
482 printAsCString(O, CVA, NumElts);
487 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
489 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
490 const TargetData *TD = TM.getTargetData();
492 if (CV->isNullValue() || isa<UndefValue>(CV)) {
493 EmitZeros(TD->getTypeSize(CV->getType()));
495 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
496 if (CVA->isString()) {
498 } else { // Not a string. Print the values in successive locations
499 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
500 EmitGlobalConstant(CVA->getOperand(i));
503 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
504 // Print the fields in successive locations. Pad to align if needed!
505 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
506 uint64_t sizeSoFar = 0;
507 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
508 const Constant* field = CVS->getOperand(i);
510 // Check if padding is needed and insert one or more 0s.
511 uint64_t fieldSize = TD->getTypeSize(field->getType());
512 uint64_t padSize = ((i == e-1? cvsLayout->StructSize
513 : cvsLayout->MemberOffsets[i+1])
514 - cvsLayout->MemberOffsets[i]) - fieldSize;
515 sizeSoFar += fieldSize + padSize;
517 // Now print the actual field value
518 EmitGlobalConstant(field);
520 // Insert the field padding unless it's zero bytes...
523 assert(sizeSoFar == cvsLayout->StructSize &&
524 "Layout of constant struct may be incorrect!");
526 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
527 // FP Constants are printed as integer constants to avoid losing
529 double Val = CFP->getValue();
530 if (CFP->getType() == Type::DoubleTy) {
531 if (Data64bitsDirective)
532 O << Data64bitsDirective << DoubleToBits(Val) << "\t" << CommentString
533 << " double value: " << Val << "\n";
534 else if (TD->isBigEndian()) {
535 O << Data32bitsDirective << unsigned(DoubleToBits(Val) >> 32)
536 << "\t" << CommentString << " double most significant word "
538 O << Data32bitsDirective << unsigned(DoubleToBits(Val))
539 << "\t" << CommentString << " double least significant word "
542 O << Data32bitsDirective << unsigned(DoubleToBits(Val))
543 << "\t" << CommentString << " double least significant word " << Val
545 O << Data32bitsDirective << unsigned(DoubleToBits(Val) >> 32)
546 << "\t" << CommentString << " double most significant word " << Val
551 O << Data32bitsDirective << FloatToBits(Val) << "\t" << CommentString
552 << " float " << Val << "\n";
555 } else if (CV->getType() == Type::ULongTy || CV->getType() == Type::LongTy) {
556 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
557 uint64_t Val = CI->getRawValue();
559 if (Data64bitsDirective)
560 O << Data64bitsDirective << Val << "\n";
561 else if (TD->isBigEndian()) {
562 O << Data32bitsDirective << unsigned(Val >> 32)
563 << "\t" << CommentString << " Double-word most significant word "
565 O << Data32bitsDirective << unsigned(Val)
566 << "\t" << CommentString << " Double-word least significant word "
569 O << Data32bitsDirective << unsigned(Val)
570 << "\t" << CommentString << " Double-word least significant word "
572 O << Data32bitsDirective << unsigned(Val >> 32)
573 << "\t" << CommentString << " Double-word most significant word "
578 } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(CV)) {
579 const PackedType *PTy = CP->getType();
581 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
582 EmitGlobalConstant(CP->getOperand(I));
587 const Type *type = CV->getType();
588 switch (type->getTypeID()) {
590 case Type::UByteTyID: case Type::SByteTyID:
591 O << Data8bitsDirective;
593 case Type::UShortTyID: case Type::ShortTyID:
594 O << Data16bitsDirective;
596 case Type::PointerTyID:
597 if (TD->getPointerSize() == 8) {
598 assert(Data64bitsDirective &&
599 "Target cannot handle 64-bit pointer exprs!");
600 O << Data64bitsDirective;
603 //Fall through for pointer size == int size
604 case Type::UIntTyID: case Type::IntTyID:
605 O << Data32bitsDirective;
607 case Type::ULongTyID: case Type::LongTyID:
608 assert(Data64bitsDirective &&"Target cannot handle 64-bit constant exprs!");
609 O << Data64bitsDirective;
611 case Type::FloatTyID: case Type::DoubleTyID:
612 assert (0 && "Should have already output floating point constant.");
614 assert (0 && "Can't handle printing this type of thing");
617 EmitConstantValueOnly(CV);
621 /// printInlineAsm - This method formats and prints the specified machine
622 /// instruction that is an inline asm.
623 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
624 unsigned NumOperands = MI->getNumOperands();
626 // Count the number of register definitions.
627 unsigned NumDefs = 0;
628 for (; MI->getOperand(NumDefs).isDef(); ++NumDefs)
629 assert(NumDefs != NumOperands-1 && "No asm string?");
631 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
633 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
634 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
636 // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
637 if (AsmStr[0] == 0) {
638 O << "\n"; // Tab already printed, avoid double indenting next instr.
642 O << InlineAsmStart << "\n\t";
644 // The variant of the current asmprinter: FIXME: change.
645 int AsmPrinterVariant = 0;
647 int CurVariant = -1; // The number of the {.|.|.} region we are in.
648 const char *LastEmitted = AsmStr; // One past the last character emitted.
650 while (*LastEmitted) {
651 switch (*LastEmitted) {
653 // Not a special case, emit the string section literally.
654 const char *LiteralEnd = LastEmitted+1;
655 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
656 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
658 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
659 O.write(LastEmitted, LiteralEnd-LastEmitted);
660 LastEmitted = LiteralEnd;
664 ++LastEmitted; // Consume newline character.
665 O << "\n\t"; // Indent code with newline.
668 ++LastEmitted; // Consume '$' character.
669 if (*LastEmitted == '$') { // $$ -> $
670 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
672 ++LastEmitted; // Consume second '$' character.
676 bool HasCurlyBraces = false;
677 if (*LastEmitted == '{') { // ${variable}
678 ++LastEmitted; // Consume '{' character.
679 HasCurlyBraces = true;
682 const char *IDStart = LastEmitted;
684 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
685 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
686 std::cerr << "Bad $ operand number in inline asm string: '"
692 char Modifier[2] = { 0, 0 };
694 if (HasCurlyBraces) {
695 // If we have curly braces, check for a modifier character. This
696 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
697 if (*LastEmitted == ':') {
698 ++LastEmitted; // Consume ':' character.
699 if (*LastEmitted == 0) {
700 std::cerr << "Bad ${:} expression in inline asm string: '"
705 Modifier[0] = *LastEmitted;
706 ++LastEmitted; // Consume modifier character.
709 if (*LastEmitted != '}') {
710 std::cerr << "Bad ${} expression in inline asm string: '"
714 ++LastEmitted; // Consume '}' character.
717 if ((unsigned)Val >= NumOperands-1) {
718 std::cerr << "Invalid $ operand number in inline asm string: '"
723 // Okay, we finally have a value number. Ask the target to print this
725 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
730 // Scan to find the machine operand number for the operand.
732 if (OpNo >= MI->getNumOperands()) break;
733 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
734 OpNo += (OpFlags >> 3) + 1;
737 if (OpNo >= MI->getNumOperands()) {
740 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
741 ++OpNo; // Skip over the ID number.
743 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
744 if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
745 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
746 Modifier[0] ? Modifier : 0);
748 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
749 Modifier[0] ? Modifier : 0);
753 std::cerr << "Invalid operand found in inline asm: '"
762 ++LastEmitted; // Consume '{' character.
763 if (CurVariant != -1) {
764 std::cerr << "Nested variants found in inline asm string: '"
768 CurVariant = 0; // We're in the first variant now.
771 ++LastEmitted; // consume '|' character.
772 if (CurVariant == -1) {
773 std::cerr << "Found '|' character outside of variant in inline asm "
774 << "string: '" << AsmStr << "'\n";
777 ++CurVariant; // We're in the next variant.
780 ++LastEmitted; // consume '}' character.
781 if (CurVariant == -1) {
782 std::cerr << "Found '}' character outside of variant in inline asm "
783 << "string: '" << AsmStr << "'\n";
790 O << "\n\t" << InlineAsmEnd << "\n";
793 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
794 /// instruction, using the specified assembler variant. Targets should
795 /// overried this to format as appropriate.
796 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
797 unsigned AsmVariant, const char *ExtraCode) {
798 // Target doesn't support this yet!
802 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
804 const char *ExtraCode) {
805 // Target doesn't support this yet!
809 /// printBasicBlockLabel - This method prints the label for the specified
810 /// MachineBasicBlock
811 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
813 bool printComment) const {
814 O << PrivateGlobalPrefix << "BB" << FunctionNumber << "_"
819 O << '\t' << CommentString << MBB->getBasicBlock()->getName();