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 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);
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 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
193 // Use JumpTableDirective otherwise honor the entry size from the jump table
195 const char *JTEntryDirective = TAI->getJumpTableDirective();
196 bool HadJTEntryDirective = JTEntryDirective != NULL;
197 if (!HadJTEntryDirective) {
198 JTEntryDirective = MJTI->getEntrySize() == 4 ?
199 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
202 // Pick the directive to use to print the jump table entries, and switch to
203 // the appropriate section.
204 TargetLowering *LoweringInfo = TM.getTargetLowering();
206 if (IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) {
207 // In PIC mode, we need to emit the jump table to the same section as the
208 // function body itself, otherwise the label differences won't make sense.
209 const Function *F = MF.getFunction();
210 SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
212 SwitchToDataSection(TAI->getJumpTableDataSection());
215 EmitAlignment(Log2_32(MJTI->getAlignment()));
217 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
218 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
220 // If this jump table was deleted, ignore it.
221 if (JTBBs.empty()) continue;
223 // For PIC codegen, if possible we want to use the SetDirective to reduce
224 // the number of relocations the assembler will generate for the jump table.
225 // Set directives are all printed before the jump table itself.
226 std::set<MachineBasicBlock*> EmittedSets;
227 if (TAI->getSetDirective() && IsPic)
228 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
229 if (EmittedSets.insert(JTBBs[ii]).second)
230 printSetLabel(i, JTBBs[ii]);
232 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
233 << '_' << i << ":\n";
235 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
236 O << JTEntryDirective << ' ';
237 // If we have emitted set directives for the jump table entries, print
238 // them rather than the entries themselves. If we're emitting PIC, then
239 // emit the table entries as differences between two text section labels.
240 // If we're emitting non-PIC code, then emit the entries as direct
241 // references to the target basic blocks.
242 if (!EmittedSets.empty()) {
243 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
244 << '_' << i << "_set_" << JTBBs[ii]->getNumber();
246 printBasicBlockLabel(JTBBs[ii], false, false);
247 //If the arch uses custom Jump Table directives, don't calc relative to JT
248 if (!HadJTEntryDirective)
249 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
250 << getFunctionNumber() << '_' << i;
252 printBasicBlockLabel(JTBBs[ii], false, false);
259 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
260 /// special global used by LLVM. If so, emit it and return true, otherwise
261 /// do nothing and return false.
262 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
263 // Ignore debug and non-emitted data.
264 if (GV->getSection() == "llvm.metadata") return true;
266 if (!GV->hasAppendingLinkage()) return false;
268 assert(GV->hasInitializer() && "Not a special LLVM global!");
270 if (GV->getName() == "llvm.used") {
271 if (TAI->getUsedDirective() != 0) // No need to emit this at all.
272 EmitLLVMUsedList(GV->getInitializer());
276 if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
277 SwitchToDataSection(TAI->getStaticCtorsSection());
279 EmitXXStructorList(GV->getInitializer());
283 if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
284 SwitchToDataSection(TAI->getStaticDtorsSection());
286 EmitXXStructorList(GV->getInitializer());
293 /// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
294 /// global in the specified llvm.used list as being used with this directive.
295 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
296 const char *Directive = TAI->getUsedDirective();
298 // Should be an array of 'sbyte*'.
299 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
300 if (InitList == 0) return;
302 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
304 EmitConstantValueOnly(InitList->getOperand(i));
309 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
310 /// function pointers, ignoring the init priority.
311 void AsmPrinter::EmitXXStructorList(Constant *List) {
312 // Should be an array of '{ int, void ()* }' structs. The first value is the
313 // init priority, which we ignore.
314 if (!isa<ConstantArray>(List)) return;
315 ConstantArray *InitList = cast<ConstantArray>(List);
316 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
317 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
318 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
320 if (CS->getOperand(1)->isNullValue())
321 return; // Found a null terminator, exit printing.
322 // Emit the function pointer.
323 EmitGlobalConstant(CS->getOperand(1));
327 /// getGlobalLinkName - Returns the asm/link name of of the specified
328 /// global variable. Should be overridden by each target asm printer to
329 /// generate the appropriate value.
330 const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
331 std::string LinkName;
333 if (isa<Function>(GV)) {
334 LinkName += TAI->getFunctionAddrPrefix();
335 LinkName += Mang->getValueName(GV);
336 LinkName += TAI->getFunctionAddrSuffix();
338 LinkName += TAI->getGlobalVarAddrPrefix();
339 LinkName += Mang->getValueName(GV);
340 LinkName += TAI->getGlobalVarAddrSuffix();
346 // EmitAlignment - Emit an alignment directive to the specified power of two.
347 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
348 if (GV && GV->getAlignment())
349 NumBits = Log2_32(GV->getAlignment());
350 if (NumBits == 0) return; // No need to emit alignment.
351 if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
352 O << TAI->getAlignDirective() << NumBits << "\n";
355 /// EmitZeros - Emit a block of zeros.
357 void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
359 if (TAI->getZeroDirective()) {
360 O << TAI->getZeroDirective() << NumZeros;
361 if (TAI->getZeroDirectiveSuffix())
362 O << TAI->getZeroDirectiveSuffix();
365 for (; NumZeros; --NumZeros)
366 O << TAI->getData8bitsDirective() << "0\n";
371 // Print out the specified constant, without a storage class. Only the
372 // constants valid in constant expressions can occur here.
373 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
374 if (CV->isNullValue() || isa<UndefValue>(CV))
376 else if (const ConstantBool *CB = dyn_cast<ConstantBool>(CV)) {
377 assert(CB->getValue());
379 } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
380 if (CI->getType()->isSigned()) {
381 if (((CI->getSExtValue() << 32) >> 32) == CI->getSExtValue())
382 O << CI->getSExtValue();
384 O << (uint64_t)CI->getSExtValue();
386 O << CI->getZExtValue();
387 } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
388 // This is a constant address for a global variable or function. Use the
389 // name of the variable or function as the address value, possibly
390 // decorating it with GlobalVarAddrPrefix/Suffix or
391 // FunctionAddrPrefix/Suffix (these all default to "" )
392 if (isa<Function>(GV)) {
393 O << TAI->getFunctionAddrPrefix()
394 << Mang->getValueName(GV)
395 << TAI->getFunctionAddrSuffix();
397 O << TAI->getGlobalVarAddrPrefix()
398 << Mang->getValueName(GV)
399 << TAI->getGlobalVarAddrSuffix();
401 } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
402 const TargetData *TD = TM.getTargetData();
403 switch(CE->getOpcode()) {
404 case Instruction::GetElementPtr: {
405 // generate a symbolic expression for the byte address
406 const Constant *ptrVal = CE->getOperand(0);
407 std::vector<Value*> idxVec(CE->op_begin()+1, CE->op_end());
408 if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), idxVec)) {
411 EmitConstantValueOnly(ptrVal);
413 O << ") + " << Offset;
415 O << ") - " << -Offset;
417 EmitConstantValueOnly(ptrVal);
421 case Instruction::Trunc:
422 case Instruction::ZExt:
423 case Instruction::SExt:
424 case Instruction::FPTrunc:
425 case Instruction::FPExt:
426 case Instruction::UIToFP:
427 case Instruction::SIToFP:
428 case Instruction::FPToUI:
429 case Instruction::FPToSI:
430 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
432 case Instruction::BitCast:
433 return EmitConstantValueOnly(CE->getOperand(0));
435 case Instruction::IntToPtr: {
436 // Handle casts to pointers by changing them into casts to the appropriate
437 // integer type. This promotes constant folding and simplifies this code.
438 Constant *Op = CE->getOperand(0);
439 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
440 return EmitConstantValueOnly(Op);
444 case Instruction::PtrToInt: {
445 // Support only foldable casts to/from pointers that can be eliminated by
446 // changing the pointer to the appropriately sized integer type.
447 Constant *Op = CE->getOperand(0);
448 const Type *Ty = CE->getType();
450 // We can emit the pointer value into this slot if the slot is an
451 // integer slot greater or equal to the size of the pointer.
452 if (Ty->isIntegral() &&
453 Ty->getPrimitiveSize() >= TD->getTypeSize(Op->getType()))
454 return EmitConstantValueOnly(Op);
456 assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
457 EmitConstantValueOnly(Op);
460 case Instruction::Add:
462 EmitConstantValueOnly(CE->getOperand(0));
464 EmitConstantValueOnly(CE->getOperand(1));
468 assert(0 && "Unsupported operator!");
471 assert(0 && "Unknown constant value!");
475 /// toOctal - Convert the low order bits of X into an octal digit.
477 static inline char toOctal(int X) {
481 /// printAsCString - Print the specified array as a C compatible string, only if
482 /// the predicate isString is true.
484 static void printAsCString(std::ostream &O, const ConstantArray *CVA,
486 assert(CVA->isString() && "Array is not string compatible!");
489 for (unsigned i = 0; i != LastElt; ++i) {
491 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
495 } else if (C == '\\') {
497 } else if (isprint(C)) {
501 case '\b': O << "\\b"; break;
502 case '\f': O << "\\f"; break;
503 case '\n': O << "\\n"; break;
504 case '\r': O << "\\r"; break;
505 case '\t': O << "\\t"; break;
508 O << toOctal(C >> 6);
509 O << toOctal(C >> 3);
510 O << toOctal(C >> 0);
518 /// EmitString - Emit a zero-byte-terminated string constant.
520 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
521 unsigned NumElts = CVA->getNumOperands();
522 if (TAI->getAscizDirective() && NumElts &&
523 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
524 O << TAI->getAscizDirective();
525 printAsCString(O, CVA, NumElts-1);
527 O << TAI->getAsciiDirective();
528 printAsCString(O, CVA, NumElts);
533 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
535 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
536 const TargetData *TD = TM.getTargetData();
538 if (CV->isNullValue() || isa<UndefValue>(CV)) {
539 EmitZeros(TD->getTypeSize(CV->getType()));
541 } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
542 if (CVA->isString()) {
544 } else { // Not a string. Print the values in successive locations
545 for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
546 EmitGlobalConstant(CVA->getOperand(i));
549 } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
550 // Print the fields in successive locations. Pad to align if needed!
551 const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
552 uint64_t sizeSoFar = 0;
553 for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
554 const Constant* field = CVS->getOperand(i);
556 // Check if padding is needed and insert one or more 0s.
557 uint64_t fieldSize = TD->getTypeSize(field->getType());
558 uint64_t padSize = ((i == e-1? cvsLayout->StructSize
559 : cvsLayout->MemberOffsets[i+1])
560 - cvsLayout->MemberOffsets[i]) - fieldSize;
561 sizeSoFar += fieldSize + padSize;
563 // Now print the actual field value
564 EmitGlobalConstant(field);
566 // Insert the field padding unless it's zero bytes...
569 assert(sizeSoFar == cvsLayout->StructSize &&
570 "Layout of constant struct may be incorrect!");
572 } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
573 // FP Constants are printed as integer constants to avoid losing
575 double Val = CFP->getValue();
576 if (CFP->getType() == Type::DoubleTy) {
577 if (TAI->getData64bitsDirective())
578 O << TAI->getData64bitsDirective() << DoubleToBits(Val) << "\t"
579 << TAI->getCommentString() << " double value: " << Val << "\n";
580 else if (TD->isBigEndian()) {
581 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
582 << "\t" << TAI->getCommentString()
583 << " double most significant word " << Val << "\n";
584 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
585 << "\t" << TAI->getCommentString()
586 << " double least significant word " << Val << "\n";
588 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val))
589 << "\t" << TAI->getCommentString()
590 << " double least significant word " << Val << "\n";
591 O << TAI->getData32bitsDirective() << unsigned(DoubleToBits(Val) >> 32)
592 << "\t" << TAI->getCommentString()
593 << " double most significant word " << Val << "\n";
597 O << TAI->getData32bitsDirective() << FloatToBits(Val)
598 << "\t" << TAI->getCommentString() << " float " << Val << "\n";
601 } else if (CV->getType() == Type::ULongTy || CV->getType() == Type::LongTy) {
602 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
603 uint64_t Val = CI->getZExtValue();
605 if (TAI->getData64bitsDirective())
606 O << TAI->getData64bitsDirective() << Val << "\n";
607 else if (TD->isBigEndian()) {
608 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
609 << "\t" << TAI->getCommentString()
610 << " Double-word most significant word " << Val << "\n";
611 O << TAI->getData32bitsDirective() << unsigned(Val)
612 << "\t" << TAI->getCommentString()
613 << " Double-word least significant word " << Val << "\n";
615 O << TAI->getData32bitsDirective() << unsigned(Val)
616 << "\t" << TAI->getCommentString()
617 << " Double-word least significant word " << Val << "\n";
618 O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
619 << "\t" << TAI->getCommentString()
620 << " Double-word most significant word " << Val << "\n";
624 } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(CV)) {
625 const PackedType *PTy = CP->getType();
627 for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
628 EmitGlobalConstant(CP->getOperand(I));
633 const Type *type = CV->getType();
634 printDataDirective(type);
635 EmitConstantValueOnly(CV);
640 AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
641 // Target doesn't support this yet!
645 /// PrintSpecial - Print information related to the specified machine instr
646 /// that is independent of the operand, and may be independent of the instr
647 /// itself. This can be useful for portably encoding the comment character
648 /// or other bits of target-specific knowledge into the asmstrings. The
649 /// syntax used is ${:comment}. Targets can override this to add support
650 /// for their own strange codes.
651 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
652 if (!strcmp(Code, "private")) {
653 O << TAI->getPrivateGlobalPrefix();
654 } else if (!strcmp(Code, "comment")) {
655 O << TAI->getCommentString();
656 } else if (!strcmp(Code, "uid")) {
657 // Assign a unique ID to this machine instruction.
658 static const MachineInstr *LastMI = 0;
659 static unsigned Counter = 0U-1;
660 // If this is a new machine instruction, bump the counter.
661 if (LastMI != MI) { ++Counter; LastMI = MI; }
664 cerr << "Unknown special formatter '" << Code
665 << "' for machine instr: " << *MI;
671 /// printInlineAsm - This method formats and prints the specified machine
672 /// instruction that is an inline asm.
673 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
674 unsigned NumOperands = MI->getNumOperands();
676 // Count the number of register definitions.
677 unsigned NumDefs = 0;
678 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
680 assert(NumDefs != NumOperands-1 && "No asm string?");
682 assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
684 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
685 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
687 // If this asmstr is empty, don't bother printing the #APP/#NOAPP markers.
688 if (AsmStr[0] == 0) {
689 O << "\n"; // Tab already printed, avoid double indenting next instr.
693 O << TAI->getInlineAsmStart() << "\n\t";
695 // The variant of the current asmprinter: FIXME: change.
696 int AsmPrinterVariant = 0;
698 int CurVariant = -1; // The number of the {.|.|.} region we are in.
699 const char *LastEmitted = AsmStr; // One past the last character emitted.
701 while (*LastEmitted) {
702 switch (*LastEmitted) {
704 // Not a special case, emit the string section literally.
705 const char *LiteralEnd = LastEmitted+1;
706 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
707 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
709 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
710 O.write(LastEmitted, LiteralEnd-LastEmitted);
711 LastEmitted = LiteralEnd;
715 ++LastEmitted; // Consume newline character.
716 O << "\n\t"; // Indent code with newline.
719 ++LastEmitted; // Consume '$' character.
723 switch (*LastEmitted) {
724 default: Done = false; break;
726 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
728 ++LastEmitted; // Consume second '$' character.
730 case '(': // $( -> same as GCC's { character.
731 ++LastEmitted; // Consume '(' character.
732 if (CurVariant != -1) {
733 cerr << "Nested variants found in inline asm string: '"
737 CurVariant = 0; // We're in the first variant now.
740 ++LastEmitted; // consume '|' character.
741 if (CurVariant == -1) {
742 cerr << "Found '|' character outside of variant in inline asm "
743 << "string: '" << AsmStr << "'\n";
746 ++CurVariant; // We're in the next variant.
748 case ')': // $) -> same as GCC's } char.
749 ++LastEmitted; // consume ')' character.
750 if (CurVariant == -1) {
751 cerr << "Found '}' character outside of variant in inline asm "
752 << "string: '" << AsmStr << "'\n";
760 bool HasCurlyBraces = false;
761 if (*LastEmitted == '{') { // ${variable}
762 ++LastEmitted; // Consume '{' character.
763 HasCurlyBraces = true;
766 const char *IDStart = LastEmitted;
768 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
769 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
770 cerr << "Bad $ operand number in inline asm string: '"
776 char Modifier[2] = { 0, 0 };
778 if (HasCurlyBraces) {
779 // If we have curly braces, check for a modifier character. This
780 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
781 if (*LastEmitted == ':') {
782 ++LastEmitted; // Consume ':' character.
783 if (*LastEmitted == 0) {
784 cerr << "Bad ${:} expression in inline asm string: '"
789 Modifier[0] = *LastEmitted;
790 ++LastEmitted; // Consume modifier character.
793 if (*LastEmitted != '}') {
794 cerr << "Bad ${} expression in inline asm string: '"
798 ++LastEmitted; // Consume '}' character.
801 if ((unsigned)Val >= NumOperands-1) {
802 cerr << "Invalid $ operand number in inline asm string: '"
807 // Okay, we finally have a value number. Ask the target to print this
809 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
814 // Scan to find the machine operand number for the operand.
816 if (OpNo >= MI->getNumOperands()) break;
817 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
818 OpNo += (OpFlags >> 3) + 1;
821 if (OpNo >= MI->getNumOperands()) {
824 unsigned OpFlags = MI->getOperand(OpNo).getImmedValue();
825 ++OpNo; // Skip over the ID number.
827 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
828 if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
829 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
830 Modifier[0] ? Modifier : 0);
832 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
833 Modifier[0] ? Modifier : 0);
837 cerr << "Invalid operand found in inline asm: '"
847 O << "\n\t" << TAI->getInlineAsmEnd() << "\n";
850 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
851 /// instruction, using the specified assembler variant. Targets should
852 /// overried this to format as appropriate.
853 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
854 unsigned AsmVariant, const char *ExtraCode) {
855 // Target doesn't support this yet!
859 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
861 const char *ExtraCode) {
862 // Target doesn't support this yet!
866 /// printBasicBlockLabel - This method prints the label for the specified
867 /// MachineBasicBlock
868 void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
870 bool printComment) const {
871 O << TAI->getPrivateGlobalPrefix() << "BB" << FunctionNumber << "_"
875 if (printComment && MBB->getBasicBlock())
876 O << '\t' << TAI->getCommentString() << MBB->getBasicBlock()->getName();
879 /// printSetLabel - This method prints a set label for the specified
880 /// MachineBasicBlock
881 void AsmPrinter::printSetLabel(unsigned uid,
882 const MachineBasicBlock *MBB) const {
883 if (!TAI->getSetDirective())
886 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
887 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
888 printBasicBlockLabel(MBB, false, false);
889 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
890 << '_' << uid << '\n';
893 void AsmPrinter::printSetLabel(unsigned uid, unsigned uid2,
894 const MachineBasicBlock *MBB) const {
895 if (!TAI->getSetDirective())
898 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
899 << getFunctionNumber() << '_' << uid << '_' << uid2
900 << "_set_" << MBB->getNumber() << ',';
901 printBasicBlockLabel(MBB, false, false);
902 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
903 << '_' << uid << '_' << uid2 << '\n';
906 /// printDataDirective - This method prints the asm directive for the
908 void AsmPrinter::printDataDirective(const Type *type) {
909 const TargetData *TD = TM.getTargetData();
910 switch (type->getTypeID()) {
912 case Type::UByteTyID: case Type::SByteTyID:
913 O << TAI->getData8bitsDirective();
915 case Type::UShortTyID: case Type::ShortTyID:
916 O << TAI->getData16bitsDirective();
918 case Type::PointerTyID:
919 if (TD->getPointerSize() == 8) {
920 assert(TAI->getData64bitsDirective() &&
921 "Target cannot handle 64-bit pointer exprs!");
922 O << TAI->getData64bitsDirective();
925 //Fall through for pointer size == int size
926 case Type::UIntTyID: case Type::IntTyID:
927 O << TAI->getData32bitsDirective();
929 case Type::ULongTyID: case Type::LongTyID:
930 assert(TAI->getData64bitsDirective() &&
931 "Target cannot handle 64-bit constant exprs!");
932 O << TAI->getData64bitsDirective();
934 case Type::FloatTyID: case Type::DoubleTyID:
935 assert (0 && "Should have already output floating point constant.");
937 assert (0 && "Can't handle printing this type of thing");