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/Support/Streams.h"
24 #include "llvm/Target/TargetAsmInfo.h"
25 #include "llvm/Target/TargetData.h"
26 #include "llvm/Target/TargetLowering.h"
27 #include "llvm/Target/TargetMachine.h"
31 AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm,
32 const TargetAsmInfo *T)
33 : FunctionNumber(0), O(o), TM(tm), TAI(T)
36 std::string AsmPrinter::getSectionForFunction(const Function &F) const {
37 return TAI->getTextSection();
41 /// SwitchToTextSection - Switch to the specified text section of the executable
42 /// if we are not already in it!
44 void AsmPrinter::SwitchToTextSection(const char *NewSection,
45 const GlobalValue *GV) {
47 if (GV && GV->hasSection())
48 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
52 // If we're already in this section, we're done.
53 if (CurrentSection == NS) return;
55 // Close the current section, if applicable.
56 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
57 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
61 if (!CurrentSection.empty())
62 O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
65 /// SwitchToDataSection - Switch to the specified data section of the executable
66 /// if we are not already in it!
68 void AsmPrinter::SwitchToDataSection(const char *NewSection,
69 const GlobalValue *GV) {
71 if (GV && GV->hasSection())
72 NS = TAI->getSwitchToSectionDirective() + GV->getSection();
76 // If we're already in this section, we're done.
77 if (CurrentSection == NS) return;
79 // Close the current section, if applicable.
80 if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
81 O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << "\n";
85 if (!CurrentSection.empty())
86 O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
90 bool AsmPrinter::doInitialization(Module &M) {
91 Mang = new Mangler(M, TAI->getGlobalPrefix());
93 if (!M.getModuleInlineAsm().empty())
94 O << TAI->getCommentString() << " Start of file scope inline assembly\n"
95 << M.getModuleInlineAsm()
96 << "\n" << TAI->getCommentString()
97 << " End of file scope inline assembly\n";
99 SwitchToDataSection(""); // Reset back to no section.
101 if (MachineDebugInfo *DebugInfo = getAnalysisToUpdate<MachineDebugInfo>()) {
102 DebugInfo->AnalyzeModule(M);
108 bool AsmPrinter::doFinalization(Module &M) {
109 if (TAI->getWeakRefDirective()) {
110 if (ExtWeakSymbols.begin() != ExtWeakSymbols.end())
111 SwitchToDataSection("");
113 for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(),
114 e = ExtWeakSymbols.end(); i != e; ++i) {
115 const GlobalValue *GV = *i;
116 std::string Name = Mang->getValueName(GV);
117 O << TAI->getWeakRefDirective() << Name << "\n";
121 delete Mang; Mang = 0;
125 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
126 // What's my mangled name?
127 CurrentFnName = Mang->getValueName(MF.getFunction());
128 IncrementFunctionNumber();
131 /// EmitConstantPool - Print to the current output stream assembly
132 /// representations of the constants in the constant pool MCP. This is
133 /// used to print out constants which have been "spilled to memory" by
134 /// the code generator.
136 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
137 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
138 if (CP.empty()) return;
140 // Some targets require 4-, 8-, and 16- byte constant literals to be placed
141 // in special sections.
142 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
143 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
144 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
145 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
146 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
147 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
148 MachineConstantPoolEntry CPE = CP[i];
149 const Type *Ty = CPE.getType();
150 if (TAI->getFourByteConstantSection() &&
151 TM.getTargetData()->getTypeSize(Ty) == 4)
152 FourByteCPs.push_back(std::make_pair(CPE, i));
153 else if (TAI->getEightByteConstantSection() &&
154 TM.getTargetData()->getTypeSize(Ty) == 8)
155 EightByteCPs.push_back(std::make_pair(CPE, i));
156 else if (TAI->getSixteenByteConstantSection() &&
157 TM.getTargetData()->getTypeSize(Ty) == 16)
158 SixteenByteCPs.push_back(std::make_pair(CPE, i));
160 OtherCPs.push_back(std::make_pair(CPE, i));
163 unsigned Alignment = MCP->getConstantPoolAlignment();
164 EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
165 EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
166 EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
168 EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
171 void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
172 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
173 if (CP.empty()) return;
175 SwitchToDataSection(Section);
176 EmitAlignment(Alignment);
177 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
178 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
179 << CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << " ";
180 WriteTypeSymbolic(O, CP[i].first.getType(), 0) << '\n';
181 if (CP[i].first.isMachineConstantPoolEntry())
182 EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
184 EmitGlobalConstant(CP[i].first.Val.ConstVal);
186 const Type *Ty = CP[i].first.getType();
188 TM.getTargetData()->getTypeSize(Ty);
189 unsigned ValEnd = CP[i].first.getOffset() + EntSize;
190 // Emit inter-object padding for alignment.
191 EmitZeros(CP[i+1].first.getOffset()-ValEnd);
196 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
197 /// by the current function to the current output stream.
199 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
200 MachineFunction &MF) {
201 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
202 if (JT.empty()) return;
203 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
205 // Use JumpTableDirective otherwise honor the entry size from the jump table
207 const char *JTEntryDirective = TAI->getJumpTableDirective();
208 bool HadJTEntryDirective = JTEntryDirective != NULL;
209 if (!HadJTEntryDirective) {
210 JTEntryDirective = MJTI->getEntrySize() == 4 ?
211 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
214 // Pick the directive to use to print the jump table entries, and switch to
215 // the appropriate section.
216 TargetLowering *LoweringInfo = TM.getTargetLowering();
218 const char* JumpTableDataSection = TAI->getJumpTableDataSection();
219 if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
220 !JumpTableDataSection) {
221 // In PIC mode, we need to emit the jump table to the same section as the
222 // function body itself, otherwise the label differences won't make sense.
223 // We should also do if the section name is NULL.
224 const Function *F = MF.getFunction();
225 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
227 SwitchToDataSection(JumpTableDataSection);
230 EmitAlignment(Log2_32(MJTI->getAlignment()));
232 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
233 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
235 // If this jump table was deleted, ignore it.
236 if (JTBBs.empty()) continue;
238 // For PIC codegen, if possible we want to use the SetDirective to reduce
239 // the number of relocations the assembler will generate for the jump table.
240 // Set directives are all printed before the jump table itself.
241 std::set<MachineBasicBlock*> EmittedSets;
242 if (TAI->getSetDirective() && IsPic)
243 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
244 if (EmittedSets.insert(JTBBs[ii]).second)
245 printSetLabel(i, JTBBs[ii]);
247 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
248 << '_' << i << ":\n";
250 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
251 O << JTEntryDirective << ' ';
252 // If we have emitted set directives for the jump table entries, print
253 // them rather than the entries themselves. If we're emitting PIC, then
254 // emit the table entries as differences between two text section labels.
255 // If we're emitting non-PIC code, then emit the entries as direct
256 // references to the target basic blocks.
257 if (!EmittedSets.empty()) {
258 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
259 << '_' << i << "_set_" << JTBBs[ii]->getNumber();
261 printBasicBlockLabel(JTBBs[ii], false, false);
262 //If the arch uses custom Jump Table directives, don't calc relative to JT
263 if (!HadJTEntryDirective)
264 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
265 << getFunctionNumber() << '_' << i;
267 printBasicBlockLabel(JTBBs[ii], false, false);
274 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
275 /// special global used by LLVM. If so, emit it and return true, otherwise
276 /// do nothing and return false.
277 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
278 // Ignore debug and non-emitted data.
279 if (GV->getSection() == "llvm.metadata") return true;
281 if (!GV->hasAppendingLinkage()) return false;
283 assert(GV->hasInitializer() && "Not a special LLVM global!");
285 if (GV->getName() == "llvm.used") {
286 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
287 EmitLLVMUsedList(GV->getInitializer());
291 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
292 SwitchToDataSection(TAI->getStaticCtorsSection());
294 EmitXXStructorList(GV->getInitializer());
298 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
299 SwitchToDataSection(TAI->getStaticDtorsSection());
301 EmitXXStructorList(GV->getInitializer());
308 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
309 /// global in the specified llvm.used list as being used with this directive.
310 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
311 const char *Directive = TAI->getUsedDirective();
313 // Should be an array of 'sbyte*'.
314 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
315 if (InitList == 0) return;
317 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
319 EmitConstantValueOnly(InitList->getOperand(i));
324 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
325 /// function pointers, ignoring the init priority.
326 void AsmPrinter::EmitXXStructorList(Constant *List) {
327 // Should be an array of '{ int, void ()* }' structs. The first value is the
328 // init priority, which we ignore.
329 if (!isa<ConstantArray>(List)) return;
330 ConstantArray *InitList = cast<ConstantArray>(List);
331 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
332 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
333 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
335 if (CS->getOperand(1)->isNullValue())
336 return; // Found a null terminator, exit printing.
337 // Emit the function pointer.
338 EmitGlobalConstant(CS->getOperand(1));
342 /// getGlobalLinkName - Returns the asm/link name of of the specified
343 /// global variable. Should be overridden by each target asm printer to
344 /// generate the appropriate value.
345 const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
346 std::string LinkName;
348 if (isa<Function>(GV)) {
349 LinkName += TAI->getFunctionAddrPrefix();
350 LinkName += Mang->getValueName(GV);
351 LinkName += TAI->getFunctionAddrSuffix();
353 LinkName += TAI->getGlobalVarAddrPrefix();
354 LinkName += Mang->getValueName(GV);
355 LinkName += TAI->getGlobalVarAddrSuffix();
361 // EmitAlignment - Emit an alignment directive to the specified power of two.
362 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
363 if (GV && GV->getAlignment())
364 NumBits = Log2_32(GV->getAlignment());
365 if (NumBits == 0) return; // No need to emit alignment.
366 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
367 O << TAI->getAlignDirective() << NumBits << "\n";
370 /// EmitZeros - Emit a block of zeros.
372 void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
374 if (TAI->getZeroDirective()) {
375 O << TAI->getZeroDirective() << NumZeros;
376 if (TAI->getZeroDirectiveSuffix())
377 O << TAI->getZeroDirectiveSuffix();
380 for (; NumZeros; --NumZeros)
381 O << TAI->getData8bitsDirective() << "0\n";
386 // Print out the specified constant, without a storage class. Only the
387 // constants valid in constant expressions can occur here.
388 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
389 if (CV->isNullValue() || isa<UndefValue>(CV))
391 else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
392 O << CI->getZExtValue();
393 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
394 // This is a constant address for a global variable or function. Use the
395 // name of the variable or function as the address value, possibly
396 // decorating it with GlobalVarAddrPrefix/Suffix or
397 // FunctionAddrPrefix/Suffix (these all default to "" )
398 if (isa<Function>(GV)) {
399 O << TAI->getFunctionAddrPrefix()
400 << Mang->getValueName(GV)
401 << TAI->getFunctionAddrSuffix();
403 O << TAI->getGlobalVarAddrPrefix()
404 << Mang->getValueName(GV)
405 << TAI->getGlobalVarAddrSuffix();
407 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
408 const TargetData *TD = TM.getTargetData();
409 switch(CE->getOpcode()) {
410 case Instruction::GetElementPtr: {
411 // generate a symbolic expression for the byte address
412 const Constant *ptrVal = CE->getOperand(0);
413 std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
414 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), idxVec)) {
417 EmitConstantValueOnly(ptrVal);
419 O << ") + " << Offset;
421 O << ") - " << -Offset;
423 EmitConstantValueOnly(ptrVal);
427 case Instruction::Trunc:
428 case Instruction::ZExt:
429 case Instruction::SExt:
430 case Instruction::FPTrunc:
431 case Instruction::FPExt:
432 case Instruction::UIToFP:
433 case Instruction::SIToFP:
434 case Instruction::FPToUI:
435 case Instruction::FPToSI:
436 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
438 case Instruction::BitCast:
439 return EmitConstantValueOnly(CE->getOperand(0));
441 case Instruction::IntToPtr: {
442 // Handle casts to pointers by changing them into casts to the appropriate
443 // integer type. This promotes constant folding and simplifies this code.
444 Constant *Op = CE->getOperand(0);
445 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
446 return EmitConstantValueOnly(Op);
450 case Instruction::PtrToInt: {
451 // Support only foldable casts to/from pointers that can be eliminated by
452 // changing the pointer to the appropriately sized integer type.
453 Constant *Op = CE->getOperand(0);
454 const Type *Ty = CE->getType();
456 // We can emit the pointer value into this slot if the slot is an
457 // integer slot greater or equal to the size of the pointer.
458 if (Ty->isIntegral() &&
459 TD->getTypeSize(Ty) >= TD->getTypeSize(Op->getType()))
460 return EmitConstantValueOnly(Op);
462 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
463 EmitConstantValueOnly(Op);
466 case Instruction::Add:
468 EmitConstantValueOnly(CE->getOperand(0));
470 EmitConstantValueOnly(CE->getOperand(1));
474 assert(0 && "Unsupported operator!");
477 assert(0 && "Unknown constant value!");
481 /// toOctal - Convert the low order bits of X into an octal digit.
483 static inline char toOctal(int X) {
487 /// printAsCString - Print the specified array as a C compatible string, only if
488 /// the predicate isString is true.
490 static void printAsCString(std::ostream &O, const ConstantArray *CVA,
492 assert(CVA->isString() && "Array is not string compatible!");
495 for (unsigned i = 0; i != LastElt; ++i) {
497 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
501 } else if (C == '\\') {
503 } else if (isprint(C)) {
507 case '\b': O << "\\b"; break;
508 case '\f': O << "\\f"; break;
509 case '\n': O << "\\n"; break;
510 case '\r': O << "\\r"; break;
511 case '\t': O << "\\t"; break;
514 O << toOctal(C >> 6);
515 O << toOctal(C >> 3);
516 O << toOctal(C >> 0);
524 /// EmitString - Emit a zero-byte-terminated string constant.
526 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
527 unsigned NumElts = CVA->getNumOperands();
528 if (TAI->getAscizDirective() && NumElts &&
529 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
530 O << TAI->getAscizDirective();
531 printAsCString(O, CVA, NumElts-1);
533 O << TAI->getAsciiDirective();
534 printAsCString(O, CVA, NumElts);
539 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
541 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
542 const TargetData *TD = TM.getTargetData();
544 if (CV->isNullValue() || isa<UndefValue>(CV)) {
545 EmitZeros(TD->getTypeSize(CV->getType()));
547 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
548 if (CVA->isString()) {
550 } else { // Not a string. Print the values in successive locations
551 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
552 EmitGlobalConstant(CVA->getOperand(i));
555 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
556 // Print the fields in successive locations. Pad to align if needed!
557 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
558 uint64_t sizeSoFar = 0;
559 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
560 const Constant* field = CVS->getOperand(i);
562 // Check if padding is needed and insert one or more 0s.
563 uint64_t fieldSize = TD->getTypeSize(field->getType());
564 uint64_t padSize = ((i == e-1? cvsLayout->StructSize
565 : cvsLayout->MemberOffsets[i+1])
566 - cvsLayout->MemberOffsets[i]) - fieldSize;
567 sizeSoFar += fieldSize + padSize;
569 // Now print the actual field value
570 EmitGlobalConstant(field);
572 // Insert the field padding unless it's zero bytes...
575 assert(sizeSoFar == cvsLayout->StructSize &&
576 "Layout of constant struct may be incorrect!");
578 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
579 // FP Constants are printed as integer constants to avoid losing
581 double Val = CFP->getValue();
582 if (CFP->getType() == Type::DoubleTy) {
583 if (TAI->getData64bitsDirective())
584 O << TAI->getData64bitsDirective() << DoubleToBits(Val) << "\t"
585 << TAI->getCommentString() << " double value: " << Val << "\n";
586 else if (TD->isBigEndian()) {
587 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
588 << "\t" << TAI->getCommentString()
589 << " double most significant word " << Val << "\n";
590 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
591 << "\t" << TAI->getCommentString()
592 << " double least significant word " << Val << "\n";
594 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
595 << "\t" << TAI->getCommentString()
596 << " double least significant word " << Val << "\n";
597 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
598 << "\t" << TAI->getCommentString()
599 << " double most significant word " << Val << "\n";
603 O << TAI->getData32bitsDirective() << FloatToBits(Val)
604 << "\t" << TAI->getCommentString() << " float " << Val << "\n";
607 } else if (CV->getType() == Type::Int64Ty) {
608 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
609 uint64_t Val = CI->getZExtValue();
611 if (TAI->getData64bitsDirective())
612 O << TAI->getData64bitsDirective() << Val << "\n";
613 else if (TD->isBigEndian()) {
614 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
615 << "\t" << TAI->getCommentString()
616 << " Double-word most significant word " << Val << "\n";
617 O << TAI->getData32bitsDirective() << unsigned(Val)
618 << "\t" << TAI->getCommentString()
619 << " Double-word least significant word " << Val << "\n";
621 O << TAI->getData32bitsDirective() << unsigned(Val)
622 << "\t" << TAI->getCommentString()
623 << " Double-word least significant word " << Val << "\n";
624 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
625 << "\t" << TAI->getCommentString()
626 << " Double-word most significant word " << Val << "\n";
630 } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(CV)) {
631 const PackedType *PTy = CP->getType();
633 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
634 EmitGlobalConstant(CP->getOperand(I));
639 const Type *type = CV->getType();
640 printDataDirective(type);
641 EmitConstantValueOnly(CV);
646 AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
647 // Target doesn't support this yet!
651 /// PrintSpecial - Print information related to the specified machine instr
652 /// that is independent of the operand, and may be independent of the instr
653 /// itself. This can be useful for portably encoding the comment character
654 /// or other bits of target-specific knowledge into the asmstrings. The
655 /// syntax used is ${:comment}. Targets can override this to add support
656 /// for their own strange codes.
657 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
658 if (!strcmp(Code, "private")) {
659 O << TAI->getPrivateGlobalPrefix();
660 } else if (!strcmp(Code, "comment")) {
661 O << TAI->getCommentString();
662 } else if (!strcmp(Code, "uid")) {
663 // Assign a unique ID to this machine instruction.
664 static const MachineInstr *LastMI = 0;
665 static unsigned Counter = 0U-1;
666 // If this is a new machine instruction, bump the counter.
667 if (LastMI != MI) { ++Counter; LastMI = MI; }
670 cerr << "Unknown special formatter '" << Code
671 << "' for machine instr: " << *MI;
677 /// printInlineAsm - This method formats and prints the specified machine
678 /// instruction that is an inline asm.
679 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
680 unsigned NumOperands = MI->getNumOperands();
682 // Count the number of register definitions.
683 unsigned NumDefs = 0;
684 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
686 assert(NumDefs != NumOperands-1 && "No asm string?");
688 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
690 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
691 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
693 // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
694 if (AsmStr[0] == 0) {
695 O << "\n"; // Tab already printed, avoid double indenting next instr.
699 O << TAI->getInlineAsmStart() << "\n\t";
701 // The variant of the current asmprinter: FIXME: change.
702 int AsmPrinterVariant = 0;
704 int CurVariant = -1; // The number of the {.|.|.} region we are in.
705 const char *LastEmitted = AsmStr; // One past the last character emitted.
707 while (*LastEmitted) {
708 switch (*LastEmitted) {
710 // Not a special case, emit the string section literally.
711 const char *LiteralEnd = LastEmitted+1;
712 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
713 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
715 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
716 O.write(LastEmitted, LiteralEnd-LastEmitted);
717 LastEmitted = LiteralEnd;
721 ++LastEmitted; // Consume newline character.
722 O << "\n\t"; // Indent code with newline.
725 ++LastEmitted; // Consume '$' character.
729 switch (*LastEmitted) {
730 default: Done = false; break;
732 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
734 ++LastEmitted; // Consume second '$' character.
736 case '(': // $( -> same as GCC's { character.
737 ++LastEmitted; // Consume '(' character.
738 if (CurVariant != -1) {
739 cerr << "Nested variants found in inline asm string: '"
743 CurVariant = 0; // We're in the first variant now.
746 ++LastEmitted; // consume '|' character.
747 if (CurVariant == -1) {
748 cerr << "Found '|' character outside of variant in inline asm "
749 << "string: '" << AsmStr << "'\n";
752 ++CurVariant; // We're in the next variant.
754 case ')': // $) -> same as GCC's } char.
755 ++LastEmitted; // consume ')' character.
756 if (CurVariant == -1) {
757 cerr << "Found '}' character outside of variant in inline asm "
758 << "string: '" << AsmStr << "'\n";
766 bool HasCurlyBraces = false;
767 if (*LastEmitted == '{') { // ${variable}
768 ++LastEmitted; // Consume '{' character.
769 HasCurlyBraces = true;
772 const char *IDStart = LastEmitted;
774 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
775 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
776 cerr << "Bad $ operand number in inline asm string: '"
782 char Modifier[2] = { 0, 0 };
784 if (HasCurlyBraces) {
785 // If we have curly braces, check for a modifier character. This
786 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
787 if (*LastEmitted == ':') {
788 ++LastEmitted; // Consume ':' character.
789 if (*LastEmitted == 0) {
790 cerr << "Bad ${:} expression in inline asm string: '"
795 Modifier[0] = *LastEmitted;
796 ++LastEmitted; // Consume modifier character.
799 if (*LastEmitted != '}') {
800 cerr << "Bad ${} expression in inline asm string: '"
804 ++LastEmitted; // Consume '}' character.
807 if ((unsigned)Val >= NumOperands-1) {
808 cerr << "Invalid $ operand number in inline asm string: '"
813 // Okay, we finally have a value number. Ask the target to print this
815 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
820 // Scan to find the machine operand number for the operand.
822 if (OpNo >= MI->getNumOperands()) break;
823 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
824 OpNo += (OpFlags >> 3) + 1;
827 if (OpNo >= MI->getNumOperands()) {
830 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
831 ++OpNo; // Skip over the ID number.
833 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
834 if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
835 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
836 Modifier[0] ? Modifier : 0);
838 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
839 Modifier[0] ? Modifier : 0);
843 cerr << "Invalid operand found in inline asm: '"
853 O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
856 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
857 /// instruction, using the specified assembler variant. Targets should
858 /// overried this to format as appropriate.
859 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
860 unsigned AsmVariant, const char *ExtraCode) {
861 // Target doesn't support this yet!
865 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
867 const char *ExtraCode) {
868 // Target doesn't support this yet!
872 /// printBasicBlockLabel - This method prints the label for the specified
873 /// MachineBasicBlock
874 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
876 bool printComment) const {
877 O << TAI->getPrivateGlobalPrefix() << "BB" << FunctionNumber << "_"
881 if (printComment && MBB->getBasicBlock())
882 O << '\t' << TAI->getCommentString() << MBB->getBasicBlock()->getName();
885 /// printSetLabel - This method prints a set label for the specified
886 /// MachineBasicBlock
887 void AsmPrinter::printSetLabel(unsigned uid,
888 const MachineBasicBlock *MBB) const {
889 if (!TAI->getSetDirective())
892 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
893 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
894 printBasicBlockLabel(MBB, false, false);
895 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
896 << '_' << uid << '\n';
899 void AsmPrinter::printSetLabel(unsigned uid, unsigned uid2,
900 const MachineBasicBlock *MBB) const {
901 if (!TAI->getSetDirective())
904 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
905 << getFunctionNumber() << '_' << uid << '_' << uid2
906 << "_set_" << MBB->getNumber() << ',';
907 printBasicBlockLabel(MBB, false, false);
908 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
909 << '_' << uid << '_' << uid2 << '\n';
912 /// printDataDirective - This method prints the asm directive for the
914 void AsmPrinter::printDataDirective(const Type *type) {
915 const TargetData *TD = TM.getTargetData();
916 switch (type->getTypeID()) {
917 case Type::IntegerTyID: {
918 unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
920 O << TAI->getData8bitsDirective();
921 else if (BitWidth <= 16)
922 O << TAI->getData16bitsDirective();
923 else if (BitWidth <= 32)
924 O << TAI->getData32bitsDirective();
925 else if (BitWidth <= 64) {
926 assert(TAI->getData64bitsDirective() &&
927 "Target cannot handle 64-bit constant exprs!");
928 O << TAI->getData64bitsDirective();
932 case Type::PointerTyID:
933 if (TD->getPointerSize() == 8) {
934 assert(TAI->getData64bitsDirective() &&
935 "Target cannot handle 64-bit pointer exprs!");
936 O << TAI->getData64bitsDirective();
938 O << TAI->getData32bitsDirective();
941 case Type::FloatTyID: case Type::DoubleTyID:
942 assert (0 && "Should have already output floating point constant.");
944 assert (0 && "Can't handle printing this type of thing");