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/TargetAsmInfo.h"
24 #include "llvm/Target/TargetData.h"
25 #include "llvm/Target/TargetLowering.h"
26 #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("", 0); // Reset back to no section.
101 if (MachineDebugInfo *DebugInfo = getAnalysisToUpdate<MachineDebugInfo>()) {
102 DebugInfo->AnalyzeModule(M);
108 bool AsmPrinter::doFinalization(Module &M) {
109 delete Mang; Mang = 0;
113 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
114 // What's my mangled name?
115 CurrentFnName = Mang->getValueName(MF.getFunction());
116 IncrementFunctionNumber();
119 /// EmitConstantPool - Print to the current output stream assembly
120 /// representations of the constants in the constant pool MCP. This is
121 /// used to print out constants which have been "spilled to memory" by
122 /// the code generator.
124 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
125 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
126 if (CP.empty()) return;
128 // Some targets require 4-, 8-, and 16- byte constant literals to be placed
129 // in special sections.
130 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
131 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
132 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
133 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
134 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
135 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
136 MachineConstantPoolEntry CPE = CP[i];
137 const Type *Ty = CPE.getType();
138 if (TAI->getFourByteConstantSection() &&
139 TM.getTargetData()->getTypeSize(Ty) == 4)
140 FourByteCPs.push_back(std::make_pair(CPE, i));
141 else if (TAI->getEightByteConstantSection() &&
142 TM.getTargetData()->getTypeSize(Ty) == 8)
143 EightByteCPs.push_back(std::make_pair(CPE, i));
144 else if (TAI->getSixteenByteConstantSection() &&
145 TM.getTargetData()->getTypeSize(Ty) == 16)
146 SixteenByteCPs.push_back(std::make_pair(CPE, i));
148 OtherCPs.push_back(std::make_pair(CPE, i));
151 unsigned Alignment = MCP->getConstantPoolAlignment();
152 EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
153 EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
154 EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
156 EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
159 void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
160 std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
161 if (CP.empty()) return;
163 SwitchToDataSection(Section, 0);
164 EmitAlignment(Alignment);
165 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
166 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
167 << CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << " ";
168 WriteTypeSymbolic(O, CP[i].first.getType(), 0) << '\n';
169 if (CP[i].first.isMachineConstantPoolEntry())
170 EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
172 EmitGlobalConstant(CP[i].first.Val.ConstVal);
174 const Type *Ty = CP[i].first.getType();
176 TM.getTargetData()->getTypeSize(Ty);
177 unsigned ValEnd = CP[i].first.getOffset() + EntSize;
178 // Emit inter-object padding for alignment.
179 EmitZeros(CP[i+1].first.getOffset()-ValEnd);
184 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
185 /// by the current function to the current output stream.
187 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
188 MachineFunction &MF) {
189 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
190 if (JT.empty()) return;
191 const TargetData *TD = TM.getTargetData();
193 // JTEntryDirective is a string to print sizeof(ptr) for non-PIC jump tables,
194 // and 32 bits for PIC since PIC jump table entries are differences, not
195 // pointers to blocks.
196 // Use the architecture specific relocation directive, if it is set
197 const char *JTEntryDirective = TAI->getJumpTableDirective();
198 if (!JTEntryDirective)
199 JTEntryDirective = TAI->getData32bitsDirective();
201 // Pick the directive to use to print the jump table entries, and switch to
202 // the appropriate section.
203 if (TM.getRelocationModel() == Reloc::PIC_) {
204 TargetLowering *LoweringInfo = TM.getTargetLowering();
205 if (LoweringInfo && LoweringInfo->usesGlobalOffsetTable()) {
206 SwitchToDataSection(TAI->getJumpTableDataSection(), 0);
207 if (TD->getPointerSize() == 8 && !JTEntryDirective)
208 JTEntryDirective = TAI->getData64bitsDirective();
210 // In PIC mode, we need to emit the jump table to the same section as the
211 // function body itself, otherwise the label differences won't make sense.
212 const Function *F = MF.getFunction();
213 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
216 SwitchToDataSection(TAI->getJumpTableDataSection(), 0);
217 if (TD->getPointerSize() == 8)
218 JTEntryDirective = TAI->getData64bitsDirective();
220 EmitAlignment(Log2_32(TD->getPointerAlignment()));
222 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
223 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
225 // If this jump table was deleted, ignore it.
226 if (JTBBs.empty()) continue;
228 // For PIC codegen, if possible we want to use the SetDirective to reduce
229 // the number of relocations the assembler will generate for the jump table.
230 // Set directives are all printed before the jump table itself.
231 std::set<MachineBasicBlock*> EmittedSets;
232 if (TAI->getSetDirective() && TM.getRelocationModel() == Reloc::PIC_)
233 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
234 if (EmittedSets.insert(JTBBs[ii]).second)
235 printSetLabel(i, JTBBs[ii]);
237 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
238 << '_' << i << ":\n";
240 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
241 O << JTEntryDirective << ' ';
242 // If we have emitted set directives for the jump table entries, print
243 // them rather than the entries themselves. If we're emitting PIC, then
244 // emit the table entries as differences between two text section labels.
245 // If we're emitting non-PIC code, then emit the entries as direct
246 // references to the target basic blocks.
247 if (!EmittedSets.empty()) {
248 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
249 << '_' << i << "_set_" << JTBBs[ii]->getNumber();
250 } else if (TM.getRelocationModel() == Reloc::PIC_) {
251 printBasicBlockLabel(JTBBs[ii], false, false);
252 //If the arch uses custom Jump Table directives, don't calc relative to JT
253 if (!TAI->getJumpTableDirective())
254 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
255 << getFunctionNumber() << '_' << i;
257 printBasicBlockLabel(JTBBs[ii], false, false);
264 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
265 /// special global used by LLVM. If so, emit it and return true, otherwise
266 /// do nothing and return false.
267 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
268 // Ignore debug and non-emitted data.
269 if (GV->getSection() == "llvm.metadata") return true;
271 if (!GV->hasAppendingLinkage()) return false;
273 assert(GV->hasInitializer() && "Not a special LLVM global!");
275 if (GV->getName() == "llvm.used") {
276 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
277 EmitLLVMUsedList(GV->getInitializer());
281 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
282 SwitchToDataSection(TAI->getStaticCtorsSection(), 0);
284 EmitXXStructorList(GV->getInitializer());
288 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
289 SwitchToDataSection(TAI->getStaticDtorsSection(), 0);
291 EmitXXStructorList(GV->getInitializer());
298 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
299 /// global in the specified llvm.used list as being used with this directive.
300 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
301 const char *Directive = TAI->getUsedDirective();
303 // Should be an array of 'sbyte*'.
304 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
305 if (InitList == 0) return;
307 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
309 EmitConstantValueOnly(InitList->getOperand(i));
314 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
315 /// function pointers, ignoring the init priority.
316 void AsmPrinter::EmitXXStructorList(Constant *List) {
317 // Should be an array of '{ int, void ()* }' structs. The first value is the
318 // init priority, which we ignore.
319 if (!isa<ConstantArray>(List)) return;
320 ConstantArray *InitList = cast<ConstantArray>(List);
321 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
322 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
323 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
325 if (CS->getOperand(1)->isNullValue())
326 return; // Found a null terminator, exit printing.
327 // Emit the function pointer.
328 EmitGlobalConstant(CS->getOperand(1));
332 /// getGlobalLinkName - Returns the asm/link name of of the specified
333 /// global variable. Should be overridden by each target asm printer to
334 /// generate the appropriate value.
335 const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
336 std::string LinkName;
337 // Default action is to use a global symbol.
338 LinkName = TAI->getGlobalPrefix();
339 LinkName += GV->getName();
343 // EmitAlignment - Emit an alignment directive to the specified power of two.
344 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
345 if (GV && GV->getAlignment())
346 NumBits = Log2_32(GV->getAlignment());
347 if (NumBits == 0) return; // No need to emit alignment.
348 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
349 O << TAI->getAlignDirective() << NumBits << "\n";
352 /// EmitZeros - Emit a block of zeros.
354 void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
356 if (TAI->getZeroDirective()) {
357 O << TAI->getZeroDirective() << NumZeros;
358 if (TAI->getZeroDirectiveSuffix())
359 O << TAI->getZeroDirectiveSuffix();
362 for (; NumZeros; --NumZeros)
363 O << TAI->getData8bitsDirective() << "0\n";
368 // Print out the specified constant, without a storage class. Only the
369 // constants valid in constant expressions can occur here.
370 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
371 if (CV->isNullValue() || isa<UndefValue>(CV))
373 else if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV)) {
374 assert(CB->getValue());
376 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
377 if (CI->getType()->isSigned()) {
378 if (((CI->getSExtValue() << 32) >> 32) == CI->getSExtValue())
379 O << CI->getSExtValue();
381 O << (uint64_t)CI->getSExtValue();
383 O << CI->getZExtValue();
384 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
385 // This is a constant address for a global variable or function. Use the
386 // name of the variable or function as the address value, possibly
387 // decorating it with GlobalVarAddrPrefix/Suffix or
388 // FunctionAddrPrefix/Suffix (these all default to "" )
389 if (isa<Function>(GV)) {
390 O << TAI->getFunctionAddrPrefix()
391 << Mang->getValueName(GV)
392 << TAI->getFunctionAddrSuffix();
394 O << TAI->getGlobalVarAddrPrefix()
395 << Mang->getValueName(GV)
396 << TAI->getGlobalVarAddrSuffix();
398 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
399 const TargetData *TD = TM.getTargetData();
400 switch(CE->getOpcode()) {
401 case Instruction::GetElementPtr: {
402 // generate a symbolic expression for the byte address
403 const Constant *ptrVal = CE->getOperand(0);
404 std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
405 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), idxVec)) {
408 EmitConstantValueOnly(ptrVal);
410 O << ") + " << Offset;
412 O << ") - " << -Offset;
414 EmitConstantValueOnly(ptrVal);
418 case Instruction::Cast: {
419 // Support only foldable casts to/from pointers that can be eliminated by
420 // changing the pointer to the appropriately sized integer type.
421 Constant *Op = CE->getOperand(0);
422 const Type *OpTy = Op->getType(), *Ty = CE->getType();
424 // Handle casts to pointers by changing them into casts to the appropriate
425 // integer type. This promotes constant folding and simplifies this code.
426 if (isa<PointerType>(Ty)) {
427 const Type *IntPtrTy = TD->getIntPtrType();
428 Op = ConstantExpr::getCast(Op, IntPtrTy);
429 return EmitConstantValueOnly(Op);
432 // We know the dest type is not a pointer. Is the src value a pointer or
434 if (isa<PointerType>(OpTy) || OpTy->isIntegral()) {
435 // We can emit the pointer value into this slot if the slot is an
436 // integer slot greater or equal to the size of the pointer.
437 if (Ty->isIntegral() && TD->getTypeSize(Ty) >= TD->getTypeSize(OpTy))
438 return EmitConstantValueOnly(Op);
441 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
442 EmitConstantValueOnly(Op);
445 case Instruction::Add:
447 EmitConstantValueOnly(CE->getOperand(0));
449 EmitConstantValueOnly(CE->getOperand(1));
453 assert(0 && "Unsupported operator!");
456 assert(0 && "Unknown constant value!");
460 /// toOctal - Convert the low order bits of X into an octal digit.
462 static inline char toOctal(int X) {
466 /// printAsCString - Print the specified array as a C compatible string, only if
467 /// the predicate isString is true.
469 static void printAsCString(std::ostream &O, const ConstantArray *CVA,
471 assert(CVA->isString() && "Array is not string compatible!");
474 for (unsigned i = 0; i != LastElt; ++i) {
476 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
480 } else if (C == '\\') {
482 } else if (isprint(C)) {
486 case '\b': O << "\\b"; break;
487 case '\f': O << "\\f"; break;
488 case '\n': O << "\\n"; break;
489 case '\r': O << "\\r"; break;
490 case '\t': O << "\\t"; break;
493 O << toOctal(C >> 6);
494 O << toOctal(C >> 3);
495 O << toOctal(C >> 0);
503 /// EmitString - Emit a zero-byte-terminated string constant.
505 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
506 unsigned NumElts = CVA->getNumOperands();
507 if (TAI->getAscizDirective() && NumElts &&
508 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
509 O << TAI->getAscizDirective();
510 printAsCString(O, CVA, NumElts-1);
512 O << TAI->getAsciiDirective();
513 printAsCString(O, CVA, NumElts);
518 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
520 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
521 const TargetData *TD = TM.getTargetData();
523 if (CV->isNullValue() || isa<UndefValue>(CV)) {
524 EmitZeros(TD->getTypeSize(CV->getType()));
526 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
527 if (CVA->isString()) {
529 } else { // Not a string. Print the values in successive locations
530 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
531 EmitGlobalConstant(CVA->getOperand(i));
534 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
535 // Print the fields in successive locations. Pad to align if needed!
536 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
537 uint64_t sizeSoFar = 0;
538 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
539 const Constant* field = CVS->getOperand(i);
541 // Check if padding is needed and insert one or more 0s.
542 uint64_t fieldSize = TD->getTypeSize(field->getType());
543 uint64_t padSize = ((i == e-1? cvsLayout->StructSize
544 : cvsLayout->MemberOffsets[i+1])
545 - cvsLayout->MemberOffsets[i]) - fieldSize;
546 sizeSoFar += fieldSize + padSize;
548 // Now print the actual field value
549 EmitGlobalConstant(field);
551 // Insert the field padding unless it's zero bytes...
554 assert(sizeSoFar == cvsLayout->StructSize &&
555 "Layout of constant struct may be incorrect!");
557 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
558 // FP Constants are printed as integer constants to avoid losing
560 double Val = CFP->getValue();
561 if (CFP->getType() == Type::DoubleTy) {
562 if (TAI->getData64bitsDirective())
563 O << TAI->getData64bitsDirective() << DoubleToBits(Val) << "\t"
564 << TAI->getCommentString() << " double value: " << Val << "\n";
565 else if (TD->isBigEndian()) {
566 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
567 << "\t" << TAI->getCommentString()
568 << " double most significant word " << Val << "\n";
569 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
570 << "\t" << TAI->getCommentString()
571 << " double least significant word " << Val << "\n";
573 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
574 << "\t" << TAI->getCommentString()
575 << " double least significant word " << Val << "\n";
576 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
577 << "\t" << TAI->getCommentString()
578 << " double most significant word " << Val << "\n";
582 O << TAI->getData32bitsDirective() << FloatToBits(Val)
583 << "\t" << TAI->getCommentString() << " float " << Val << "\n";
586 } else if (CV->getType() == Type::ULongTy || CV->getType() == Type::LongTy) {
587 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
588 uint64_t Val = CI->getZExtValue();
590 if (TAI->getData64bitsDirective())
591 O << TAI->getData64bitsDirective() << Val << "\n";
592 else if (TD->isBigEndian()) {
593 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
594 << "\t" << TAI->getCommentString()
595 << " Double-word most significant word " << Val << "\n";
596 O << TAI->getData32bitsDirective() << unsigned(Val)
597 << "\t" << TAI->getCommentString()
598 << " Double-word least significant word " << Val << "\n";
600 O << TAI->getData32bitsDirective() << unsigned(Val)
601 << "\t" << TAI->getCommentString()
602 << " Double-word least significant word " << Val << "\n";
603 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
604 << "\t" << TAI->getCommentString()
605 << " Double-word most significant word " << Val << "\n";
609 } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(CV)) {
610 const PackedType *PTy = CP->getType();
612 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
613 EmitGlobalConstant(CP->getOperand(I));
618 const Type *type = CV->getType();
619 printDataDirective(type);
620 EmitConstantValueOnly(CV);
625 AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
626 // Target doesn't support this yet!
630 /// PrintSpecial - Print information related to the specified machine instr
631 /// that is independent of the operand, and may be independent of the instr
632 /// itself. This can be useful for portably encoding the comment character
633 /// or other bits of target-specific knowledge into the asmstrings. The
634 /// syntax used is ${:comment}. Targets can override this to add support
635 /// for their own strange codes.
636 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
637 if (!strcmp(Code, "private")) {
638 O << TAI->getPrivateGlobalPrefix();
639 } else if (!strcmp(Code, "comment")) {
640 O << TAI->getCommentString();
641 } else if (!strcmp(Code, "uid")) {
642 // Assign a unique ID to this machine instruction.
643 static const MachineInstr *LastMI = 0;
644 static unsigned Counter = 0U-1;
645 // If this is a new machine instruction, bump the counter.
646 if (LastMI != MI) { ++Counter; LastMI = MI; }
649 std::cerr << "Unknown special formatter '" << Code
650 << "' for machine instr: " << *MI;
656 /// printInlineAsm - This method formats and prints the specified machine
657 /// instruction that is an inline asm.
658 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
659 unsigned NumOperands = MI->getNumOperands();
661 // Count the number of register definitions.
662 unsigned NumDefs = 0;
663 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
665 assert(NumDefs != NumOperands-1 && "No asm string?");
667 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
669 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
670 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
672 // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
673 if (AsmStr[0] == 0) {
674 O << "\n"; // Tab already printed, avoid double indenting next instr.
678 O << TAI->getInlineAsmStart() << "\n\t";
680 // The variant of the current asmprinter: FIXME: change.
681 int AsmPrinterVariant = 0;
683 int CurVariant = -1; // The number of the {.|.|.} region we are in.
684 const char *LastEmitted = AsmStr; // One past the last character emitted.
686 while (*LastEmitted) {
687 switch (*LastEmitted) {
689 // Not a special case, emit the string section literally.
690 const char *LiteralEnd = LastEmitted+1;
691 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
692 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
694 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
695 O.write(LastEmitted, LiteralEnd-LastEmitted);
696 LastEmitted = LiteralEnd;
700 ++LastEmitted; // Consume newline character.
701 O << "\n\t"; // Indent code with newline.
704 ++LastEmitted; // Consume '$' character.
708 switch (*LastEmitted) {
709 default: Done = false; break;
711 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
713 ++LastEmitted; // Consume second '$' character.
715 case '(': // $( -> same as GCC's { character.
716 ++LastEmitted; // Consume '(' character.
717 if (CurVariant != -1) {
718 std::cerr << "Nested variants found in inline asm string: '"
722 CurVariant = 0; // We're in the first variant now.
725 ++LastEmitted; // consume '|' character.
726 if (CurVariant == -1) {
727 std::cerr << "Found '|' character outside of variant in inline asm "
728 << "string: '" << AsmStr << "'\n";
731 ++CurVariant; // We're in the next variant.
733 case ')': // $) -> same as GCC's } char.
734 ++LastEmitted; // consume ')' character.
735 if (CurVariant == -1) {
736 std::cerr << "Found '}' character outside of variant in inline asm "
737 << "string: '" << AsmStr << "'\n";
745 bool HasCurlyBraces = false;
746 if (*LastEmitted == '{') { // ${variable}
747 ++LastEmitted; // Consume '{' character.
748 HasCurlyBraces = true;
751 const char *IDStart = LastEmitted;
753 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
754 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
755 std::cerr << "Bad $ operand number in inline asm string: '"
761 char Modifier[2] = { 0, 0 };
763 if (HasCurlyBraces) {
764 // If we have curly braces, check for a modifier character. This
765 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
766 if (*LastEmitted == ':') {
767 ++LastEmitted; // Consume ':' character.
768 if (*LastEmitted == 0) {
769 std::cerr << "Bad ${:} expression in inline asm string: '"
774 Modifier[0] = *LastEmitted;
775 ++LastEmitted; // Consume modifier character.
778 if (*LastEmitted != '}') {
779 std::cerr << "Bad ${} expression in inline asm string: '"
783 ++LastEmitted; // Consume '}' character.
786 if ((unsigned)Val >= NumOperands-1) {
787 std::cerr << "Invalid $ operand number in inline asm string: '"
792 // Okay, we finally have a value number. Ask the target to print this
794 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
799 // Scan to find the machine operand number for the operand.
801 if (OpNo >= MI->getNumOperands()) break;
802 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
803 OpNo += (OpFlags >> 3) + 1;
806 if (OpNo >= MI->getNumOperands()) {
809 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
810 ++OpNo; // Skip over the ID number.
812 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
813 if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
814 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
815 Modifier[0] ? Modifier : 0);
817 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
818 Modifier[0] ? Modifier : 0);
822 std::cerr << "Invalid operand found in inline asm: '"
832 O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
835 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
836 /// instruction, using the specified assembler variant. Targets should
837 /// overried this to format as appropriate.
838 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
839 unsigned AsmVariant, const char *ExtraCode) {
840 // Target doesn't support this yet!
844 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
846 const char *ExtraCode) {
847 // Target doesn't support this yet!
851 /// printBasicBlockLabel - This method prints the label for the specified
852 /// MachineBasicBlock
853 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
855 bool printComment) const {
856 O << TAI->getPrivateGlobalPrefix() << "BB" << FunctionNumber << "_"
860 if (printComment && MBB->getBasicBlock())
861 O << '\t' << TAI->getCommentString() << MBB->getBasicBlock()->getName();
864 /// printSetLabel - This method prints a set label for the specified
865 /// MachineBasicBlock
866 void AsmPrinter::printSetLabel(unsigned uid,
867 const MachineBasicBlock *MBB) const {
868 if (!TAI->getSetDirective())
871 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
872 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
873 printBasicBlockLabel(MBB, false, false);
874 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
875 << '_' << uid << '\n';
878 /// printDataDirective - This method prints the asm directive for the
880 void AsmPrinter::printDataDirective(const Type *type) {
881 const TargetData *TD = TM.getTargetData();
882 switch (type->getTypeID()) {
884 case Type::UByteTyID: case Type::SByteTyID:
885 O << TAI->getData8bitsDirective();
887 case Type::UShortTyID: case Type::ShortTyID:
888 O << TAI->getData16bitsDirective();
890 case Type::PointerTyID:
891 if (TD->getPointerSize() == 8) {
892 assert(TAI->getData64bitsDirective() &&
893 "Target cannot handle 64-bit pointer exprs!");
894 O << TAI->getData64bitsDirective();
897 //Fall through for pointer size == int size
898 case Type::UIntTyID: case Type::IntTyID:
899 O << TAI->getData32bitsDirective();
901 case Type::ULongTyID: case Type::LongTyID:
902 assert(TAI->getData64bitsDirective() &&
903 "Target cannot handle 64-bit constant exprs!");
904 O << TAI->getData64bitsDirective();
906 case Type::FloatTyID: case Type::DoubleTyID:
907 assert (0 && "Should have already output floating point constant.");
909 assert (0 && "Can't handle printing this type of thing");