1 //===-- Writer.cpp - Library for converting LLVM code to C ----------------===//
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 library converts LLVM code to C code, compilable by GCC and other C
13 //===----------------------------------------------------------------------===//
15 #include "CTargetMachine.h"
16 #include "llvm/CallingConv.h"
17 #include "llvm/Constants.h"
18 #include "llvm/DerivedTypes.h"
19 #include "llvm/Module.h"
20 #include "llvm/Instructions.h"
21 #include "llvm/Pass.h"
22 #include "llvm/PassManager.h"
23 #include "llvm/SymbolTable.h"
24 #include "llvm/TypeSymbolTable.h"
25 #include "llvm/Intrinsics.h"
26 #include "llvm/IntrinsicInst.h"
27 #include "llvm/InlineAsm.h"
28 #include "llvm/Analysis/ConstantsScanner.h"
29 #include "llvm/Analysis/FindUsedTypes.h"
30 #include "llvm/Analysis/LoopInfo.h"
31 #include "llvm/CodeGen/IntrinsicLowering.h"
32 #include "llvm/Transforms/Scalar.h"
33 #include "llvm/Target/TargetMachineRegistry.h"
34 #include "llvm/Target/TargetAsmInfo.h"
35 #include "llvm/Support/CallSite.h"
36 #include "llvm/Support/CFG.h"
37 #include "llvm/Support/GetElementPtrTypeIterator.h"
38 #include "llvm/Support/InstVisitor.h"
39 #include "llvm/Support/Mangler.h"
40 #include "llvm/Support/MathExtras.h"
41 #include "llvm/ADT/StringExtras.h"
42 #include "llvm/ADT/STLExtras.h"
43 #include "llvm/Support/MathExtras.h"
44 #include "llvm/Config/config.h"
50 // Register the target.
51 RegisterTarget<CTargetMachine> X("c", " C backend");
53 /// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
54 /// any unnamed structure types that are used by the program, and merges
55 /// external functions with the same name.
57 class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
58 void getAnalysisUsage(AnalysisUsage &AU) const {
59 AU.addRequired<FindUsedTypes>();
62 virtual const char *getPassName() const {
63 return "C backend type canonicalizer";
66 virtual bool runOnModule(Module &M);
69 /// CWriter - This class is the main chunk of code that converts an LLVM
70 /// module to a C translation unit.
71 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
76 const Module *TheModule;
77 const TargetAsmInfo* TAsm;
78 std::map<const Type *, std::string> TypeNames;
80 std::map<const ConstantFP *, unsigned> FPConstantMap;
82 CWriter(std::ostream &o) : Out(o), TAsm(0) {}
84 virtual const char *getPassName() const { return "C backend"; }
86 void getAnalysisUsage(AnalysisUsage &AU) const {
87 AU.addRequired<LoopInfo>();
91 virtual bool doInitialization(Module &M);
93 bool runOnFunction(Function &F) {
94 LI = &getAnalysis<LoopInfo>();
96 // Get rid of intrinsics we can't handle.
99 // Output all floating point constants that cannot be printed accurately.
100 printFloatingPointConstants(F);
102 // Ensure that no local symbols conflict with global symbols.
103 F.renameLocalSymbols();
106 FPConstantMap.clear();
110 virtual bool doFinalization(Module &M) {
117 std::ostream &printType(std::ostream &Out, const Type *Ty,
118 const std::string &VariableName = "",
119 bool IgnoreName = false);
120 std::ostream &printPrimitiveType(std::ostream &Out, const Type *Ty,
122 const std::string &NameSoFar = "");
124 void printStructReturnPointerFunctionType(std::ostream &Out,
125 const PointerType *Ty);
127 void writeOperand(Value *Operand);
128 void writeOperandRaw(Value *Operand);
129 void writeOperandInternal(Value *Operand);
130 void writeOperandWithCast(Value* Operand, unsigned Opcode);
131 void writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate);
132 bool writeInstructionCast(const Instruction &I);
135 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
137 void lowerIntrinsics(Function &F);
139 void printModule(Module *M);
140 void printModuleTypes(const TypeSymbolTable &ST);
141 void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
142 void printFloatingPointConstants(Function &F);
143 void printFunctionSignature(const Function *F, bool Prototype);
145 void printFunction(Function &);
146 void printBasicBlock(BasicBlock *BB);
147 void printLoop(Loop *L);
149 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
150 void printConstant(Constant *CPV);
151 void printConstantWithCast(Constant *CPV, unsigned Opcode);
152 bool printConstExprCast(const ConstantExpr *CE);
153 void printConstantArray(ConstantArray *CPA);
154 void printConstantPacked(ConstantPacked *CP);
156 // isInlinableInst - Attempt to inline instructions into their uses to build
157 // trees as much as possible. To do this, we have to consistently decide
158 // what is acceptable to inline, so that variable declarations don't get
159 // printed and an extra copy of the expr is not emitted.
161 static bool isInlinableInst(const Instruction &I) {
162 // Always inline cmp instructions, even if they are shared by multiple
163 // expressions. GCC generates horrible code if we don't.
167 // Must be an expression, must be used exactly once. If it is dead, we
168 // emit it inline where it would go.
169 if (I.getType() == Type::VoidTy || !I.hasOneUse() ||
170 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
171 isa<LoadInst>(I) || isa<VAArgInst>(I))
172 // Don't inline a load across a store or other bad things!
175 // Must not be used in inline asm
176 if (I.hasOneUse() && isInlineAsm(*I.use_back())) return false;
178 // Only inline instruction it if it's use is in the same BB as the inst.
179 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
182 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
183 // variables which are accessed with the & operator. This causes GCC to
184 // generate significantly better code than to emit alloca calls directly.
186 static const AllocaInst *isDirectAlloca(const Value *V) {
187 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
188 if (!AI) return false;
189 if (AI->isArrayAllocation())
190 return 0; // FIXME: we can also inline fixed size array allocas!
191 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
196 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
197 static bool isInlineAsm(const Instruction& I) {
198 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
203 // Instruction visitation functions
204 friend class InstVisitor<CWriter>;
206 void visitReturnInst(ReturnInst &I);
207 void visitBranchInst(BranchInst &I);
208 void visitSwitchInst(SwitchInst &I);
209 void visitInvokeInst(InvokeInst &I) {
210 assert(0 && "Lowerinvoke pass didn't work!");
213 void visitUnwindInst(UnwindInst &I) {
214 assert(0 && "Lowerinvoke pass didn't work!");
216 void visitUnreachableInst(UnreachableInst &I);
218 void visitPHINode(PHINode &I);
219 void visitBinaryOperator(Instruction &I);
220 void visitICmpInst(ICmpInst &I);
221 void visitFCmpInst(FCmpInst &I);
223 void visitCastInst (CastInst &I);
224 void visitSelectInst(SelectInst &I);
225 void visitCallInst (CallInst &I);
226 void visitInlineAsm(CallInst &I);
227 void visitShiftInst(ShiftInst &I) { visitBinaryOperator(I); }
229 void visitMallocInst(MallocInst &I);
230 void visitAllocaInst(AllocaInst &I);
231 void visitFreeInst (FreeInst &I);
232 void visitLoadInst (LoadInst &I);
233 void visitStoreInst (StoreInst &I);
234 void visitGetElementPtrInst(GetElementPtrInst &I);
235 void visitVAArgInst (VAArgInst &I);
237 void visitInstruction(Instruction &I) {
238 cerr << "C Writer does not know about " << I;
242 void outputLValue(Instruction *I) {
243 Out << " " << Mang->getValueName(I) << " = ";
246 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
247 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
248 BasicBlock *Successor, unsigned Indent);
249 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
251 void printIndexingExpression(Value *Ptr, gep_type_iterator I,
252 gep_type_iterator E);
256 /// This method inserts names for any unnamed structure types that are used by
257 /// the program, and removes names from structure types that are not used by the
260 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
261 // Get a set of types that are used by the program...
262 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
264 // Loop over the module symbol table, removing types from UT that are
265 // already named, and removing names for types that are not used.
267 TypeSymbolTable &TST = M.getTypeSymbolTable();
268 for (TypeSymbolTable::iterator TI = TST.begin(), TE = TST.end();
270 TypeSymbolTable::iterator I = TI++;
272 // If this is not used, remove it from the symbol table.
273 std::set<const Type *>::iterator UTI = UT.find(I->second);
277 UT.erase(UTI); // Only keep one name for this type.
280 // UT now contains types that are not named. Loop over it, naming
283 bool Changed = false;
284 unsigned RenameCounter = 0;
285 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
287 if (const StructType *ST = dyn_cast<StructType>(*I)) {
288 while (M.addTypeName("unnamed"+utostr(RenameCounter), ST))
294 // Loop over all external functions and globals. If we have two with
295 // identical names, merge them.
296 // FIXME: This code should disappear when we don't allow values with the same
297 // names when they have different types!
298 std::map<std::string, GlobalValue*> ExtSymbols;
299 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
301 if (GV->isExternal() && GV->hasName()) {
302 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
303 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
305 // Found a conflict, replace this global with the previous one.
306 GlobalValue *OldGV = X.first->second;
307 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
308 GV->eraseFromParent();
313 // Do the same for globals.
314 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
316 GlobalVariable *GV = I++;
317 if (GV->isExternal() && GV->hasName()) {
318 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
319 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
321 // Found a conflict, replace this global with the previous one.
322 GlobalValue *OldGV = X.first->second;
323 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
324 GV->eraseFromParent();
333 /// printStructReturnPointerFunctionType - This is like printType for a struct
334 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
335 /// print it as "Struct (*)(...)", for struct return functions.
336 void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
337 const PointerType *TheTy) {
338 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
339 std::stringstream FunctionInnards;
340 FunctionInnards << " (*) (";
341 bool PrintedType = false;
343 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
344 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
345 for (++I; I != E; ++I) {
347 FunctionInnards << ", ";
348 printType(FunctionInnards, *I, "");
351 if (FTy->isVarArg()) {
353 FunctionInnards << ", ...";
354 } else if (!PrintedType) {
355 FunctionInnards << "void";
357 FunctionInnards << ')';
358 std::string tstr = FunctionInnards.str();
359 printType(Out, RetTy, tstr);
363 CWriter::printPrimitiveType(std::ostream &Out, const Type *Ty, bool isSigned,
364 const std::string &NameSoFar) {
365 assert(Ty->isPrimitiveType() && "Invalid type for printPrimitiveType");
366 switch (Ty->getTypeID()) {
367 case Type::VoidTyID: return Out << "void " << NameSoFar;
368 case Type::BoolTyID: return Out << "bool " << NameSoFar;
370 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
371 case Type::Int16TyID:
372 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
373 case Type::Int32TyID:
374 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
375 case Type::Int64TyID:
376 return Out << (isSigned?"signed":"unsigned") << " long long " << NameSoFar;
377 case Type::FloatTyID: return Out << "float " << NameSoFar;
378 case Type::DoubleTyID: return Out << "double " << NameSoFar;
380 cerr << "Unknown primitive type: " << *Ty << "\n";
385 // Pass the Type* and the variable name and this prints out the variable
388 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
389 const std::string &NameSoFar,
391 if (Ty->isPrimitiveType()) {
392 // FIXME:Signedness. When integer types are signless, this should just
393 // always pass "false" for the sign of the primitive type. The instructions
394 // will figure out how the value is to be interpreted.
395 printPrimitiveType(Out, Ty, true, NameSoFar);
399 // Check to see if the type is named.
400 if (!IgnoreName || isa<OpaqueType>(Ty)) {
401 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
402 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
405 switch (Ty->getTypeID()) {
406 case Type::FunctionTyID: {
407 const FunctionType *FTy = cast<FunctionType>(Ty);
408 std::stringstream FunctionInnards;
409 FunctionInnards << " (" << NameSoFar << ") (";
410 for (FunctionType::param_iterator I = FTy->param_begin(),
411 E = FTy->param_end(); I != E; ++I) {
412 if (I != FTy->param_begin())
413 FunctionInnards << ", ";
414 printType(FunctionInnards, *I, "");
416 if (FTy->isVarArg()) {
417 if (FTy->getNumParams())
418 FunctionInnards << ", ...";
419 } else if (!FTy->getNumParams()) {
420 FunctionInnards << "void";
422 FunctionInnards << ')';
423 std::string tstr = FunctionInnards.str();
424 printType(Out, FTy->getReturnType(), tstr);
427 case Type::StructTyID: {
428 const StructType *STy = cast<StructType>(Ty);
429 Out << NameSoFar + " {\n";
431 for (StructType::element_iterator I = STy->element_begin(),
432 E = STy->element_end(); I != E; ++I) {
434 printType(Out, *I, "field" + utostr(Idx++));
440 case Type::PointerTyID: {
441 const PointerType *PTy = cast<PointerType>(Ty);
442 std::string ptrName = "*" + NameSoFar;
444 if (isa<ArrayType>(PTy->getElementType()) ||
445 isa<PackedType>(PTy->getElementType()))
446 ptrName = "(" + ptrName + ")";
448 return printType(Out, PTy->getElementType(), ptrName);
451 case Type::ArrayTyID: {
452 const ArrayType *ATy = cast<ArrayType>(Ty);
453 unsigned NumElements = ATy->getNumElements();
454 if (NumElements == 0) NumElements = 1;
455 return printType(Out, ATy->getElementType(),
456 NameSoFar + "[" + utostr(NumElements) + "]");
459 case Type::PackedTyID: {
460 const PackedType *PTy = cast<PackedType>(Ty);
461 unsigned NumElements = PTy->getNumElements();
462 if (NumElements == 0) NumElements = 1;
463 return printType(Out, PTy->getElementType(),
464 NameSoFar + "[" + utostr(NumElements) + "]");
467 case Type::OpaqueTyID: {
468 static int Count = 0;
469 std::string TyName = "struct opaque_" + itostr(Count++);
470 assert(TypeNames.find(Ty) == TypeNames.end());
471 TypeNames[Ty] = TyName;
472 return Out << TyName << ' ' << NameSoFar;
475 assert(0 && "Unhandled case in getTypeProps!");
482 void CWriter::printConstantArray(ConstantArray *CPA) {
484 // As a special case, print the array as a string if it is an array of
485 // ubytes or an array of sbytes with positive values.
487 const Type *ETy = CPA->getType()->getElementType();
488 bool isString = (ETy == Type::Int8Ty || ETy == Type::Int8Ty);
490 // Make sure the last character is a null char, as automatically added by C
491 if (isString && (CPA->getNumOperands() == 0 ||
492 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
497 // Keep track of whether the last number was a hexadecimal escape
498 bool LastWasHex = false;
500 // Do not include the last character, which we know is null
501 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
502 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
504 // Print it out literally if it is a printable character. The only thing
505 // to be careful about is when the last letter output was a hex escape
506 // code, in which case we have to be careful not to print out hex digits
507 // explicitly (the C compiler thinks it is a continuation of the previous
508 // character, sheesh...)
510 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
512 if (C == '"' || C == '\\')
519 case '\n': Out << "\\n"; break;
520 case '\t': Out << "\\t"; break;
521 case '\r': Out << "\\r"; break;
522 case '\v': Out << "\\v"; break;
523 case '\a': Out << "\\a"; break;
524 case '\"': Out << "\\\""; break;
525 case '\'': Out << "\\\'"; break;
528 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
529 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
538 if (CPA->getNumOperands()) {
540 printConstant(cast<Constant>(CPA->getOperand(0)));
541 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
543 printConstant(cast<Constant>(CPA->getOperand(i)));
550 void CWriter::printConstantPacked(ConstantPacked *CP) {
552 if (CP->getNumOperands()) {
554 printConstant(cast<Constant>(CP->getOperand(0)));
555 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
557 printConstant(cast<Constant>(CP->getOperand(i)));
563 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
564 // textually as a double (rather than as a reference to a stack-allocated
565 // variable). We decide this by converting CFP to a string and back into a
566 // double, and then checking whether the conversion results in a bit-equal
567 // double to the original value of CFP. This depends on us and the target C
568 // compiler agreeing on the conversion process (which is pretty likely since we
569 // only deal in IEEE FP).
571 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
572 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
574 sprintf(Buffer, "%a", CFP->getValue());
576 if (!strncmp(Buffer, "0x", 2) ||
577 !strncmp(Buffer, "-0x", 3) ||
578 !strncmp(Buffer, "+0x", 3))
579 return atof(Buffer) == CFP->getValue();
582 std::string StrVal = ftostr(CFP->getValue());
584 while (StrVal[0] == ' ')
585 StrVal.erase(StrVal.begin());
587 // Check to make sure that the stringized number is not some string like "Inf"
588 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
589 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
590 ((StrVal[0] == '-' || StrVal[0] == '+') &&
591 (StrVal[1] >= '0' && StrVal[1] <= '9')))
592 // Reparse stringized version!
593 return atof(StrVal.c_str()) == CFP->getValue();
598 /// Print out the casting for a cast operation. This does the double casting
599 /// necessary for conversion to the destination type, if necessary.
600 /// @brief Print a cast
601 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
602 // Print the destination type cast
604 case Instruction::UIToFP:
605 case Instruction::SIToFP:
606 case Instruction::IntToPtr:
607 case Instruction::Trunc:
608 case Instruction::BitCast:
609 case Instruction::FPExt:
610 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
612 printType(Out, DstTy);
615 case Instruction::ZExt:
616 case Instruction::PtrToInt:
617 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
619 printPrimitiveType(Out, DstTy, false);
622 case Instruction::SExt:
623 case Instruction::FPToSI: // For these, make sure we get a signed dest
625 printPrimitiveType(Out, DstTy, true);
629 assert(0 && "Invalid cast opcode");
632 // Print the source type cast
634 case Instruction::UIToFP:
635 case Instruction::ZExt:
637 printPrimitiveType(Out, SrcTy, false);
640 case Instruction::SIToFP:
641 case Instruction::SExt:
643 printPrimitiveType(Out, SrcTy, true);
646 case Instruction::IntToPtr:
647 case Instruction::PtrToInt:
648 // Avoid "cast to pointer from integer of different size" warnings
649 Out << "(unsigned long)";
651 case Instruction::Trunc:
652 case Instruction::BitCast:
653 case Instruction::FPExt:
654 case Instruction::FPTrunc:
655 case Instruction::FPToSI:
656 case Instruction::FPToUI:
657 break; // These don't need a source cast.
659 assert(0 && "Invalid cast opcode");
664 // printConstant - The LLVM Constant to C Constant converter.
665 void CWriter::printConstant(Constant *CPV) {
666 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
667 switch (CE->getOpcode()) {
668 case Instruction::Trunc:
669 case Instruction::ZExt:
670 case Instruction::SExt:
671 case Instruction::FPTrunc:
672 case Instruction::FPExt:
673 case Instruction::UIToFP:
674 case Instruction::SIToFP:
675 case Instruction::FPToUI:
676 case Instruction::FPToSI:
677 case Instruction::PtrToInt:
678 case Instruction::IntToPtr:
679 case Instruction::BitCast:
681 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
682 if (CE->getOpcode() == Instruction::SExt &&
683 CE->getOperand(0)->getType() == Type::BoolTy) {
684 // Make sure we really sext from bool here by subtracting from 0
687 printConstant(CE->getOperand(0));
688 if (CE->getType() == Type::BoolTy &&
689 (CE->getOpcode() == Instruction::Trunc ||
690 CE->getOpcode() == Instruction::FPToUI ||
691 CE->getOpcode() == Instruction::FPToSI ||
692 CE->getOpcode() == Instruction::PtrToInt)) {
693 // Make sure we really truncate to bool here by anding with 1
699 case Instruction::GetElementPtr:
701 printIndexingExpression(CE->getOperand(0), gep_type_begin(CPV),
705 case Instruction::Select:
707 printConstant(CE->getOperand(0));
709 printConstant(CE->getOperand(1));
711 printConstant(CE->getOperand(2));
714 case Instruction::Add:
715 case Instruction::Sub:
716 case Instruction::Mul:
717 case Instruction::SDiv:
718 case Instruction::UDiv:
719 case Instruction::FDiv:
720 case Instruction::URem:
721 case Instruction::SRem:
722 case Instruction::FRem:
723 case Instruction::And:
724 case Instruction::Or:
725 case Instruction::Xor:
726 case Instruction::ICmp:
727 case Instruction::FCmp:
728 case Instruction::Shl:
729 case Instruction::LShr:
730 case Instruction::AShr:
733 bool NeedsClosingParens = printConstExprCast(CE);
734 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
735 switch (CE->getOpcode()) {
736 case Instruction::Add: Out << " + "; break;
737 case Instruction::Sub: Out << " - "; break;
738 case Instruction::Mul: Out << " * "; break;
739 case Instruction::URem:
740 case Instruction::SRem:
741 case Instruction::FRem: Out << " % "; break;
742 case Instruction::UDiv:
743 case Instruction::SDiv:
744 case Instruction::FDiv: Out << " / "; break;
745 case Instruction::And: Out << " & "; break;
746 case Instruction::Or: Out << " | "; break;
747 case Instruction::Xor: Out << " ^ "; break;
748 case Instruction::Shl: Out << " << "; break;
749 case Instruction::LShr:
750 case Instruction::AShr: Out << " >> "; break;
751 case Instruction::ICmp:
752 switch (CE->getPredicate()) {
753 case ICmpInst::ICMP_EQ: Out << " == "; break;
754 case ICmpInst::ICMP_NE: Out << " != "; break;
755 case ICmpInst::ICMP_SLT:
756 case ICmpInst::ICMP_ULT: Out << " < "; break;
757 case ICmpInst::ICMP_SLE:
758 case ICmpInst::ICMP_ULE: Out << " <= "; break;
759 case ICmpInst::ICMP_SGT:
760 case ICmpInst::ICMP_UGT: Out << " > "; break;
761 case ICmpInst::ICMP_SGE:
762 case ICmpInst::ICMP_UGE: Out << " >= "; break;
763 default: assert(0 && "Illegal ICmp predicate");
766 case Instruction::FCmp:
767 switch (CE->getPredicate()) {
768 case FCmpInst::FCMP_ORD:
769 case FCmpInst::FCMP_UEQ:
770 case FCmpInst::FCMP_OEQ: Out << " == "; break;
771 case FCmpInst::FCMP_UNO:
772 case FCmpInst::FCMP_UNE:
773 case FCmpInst::FCMP_ONE: Out << " != "; break;
774 case FCmpInst::FCMP_OLT:
775 case FCmpInst::FCMP_ULT: Out << " < "; break;
776 case FCmpInst::FCMP_OLE:
777 case FCmpInst::FCMP_ULE: Out << " <= "; break;
778 case FCmpInst::FCMP_OGT:
779 case FCmpInst::FCMP_UGT: Out << " > "; break;
780 case FCmpInst::FCMP_OGE:
781 case FCmpInst::FCMP_UGE: Out << " >= "; break;
782 default: assert(0 && "Illegal FCmp predicate");
785 default: assert(0 && "Illegal opcode here!");
787 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
788 if (NeedsClosingParens)
795 cerr << "CWriter Error: Unhandled constant expression: "
799 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
801 printType(Out, CPV->getType()); // sign doesn't matter
802 Out << ")/*UNDEF*/0)";
806 switch (CPV->getType()->getTypeID()) {
808 Out << (cast<ConstantBool>(CPV)->getValue() ? '1' : '0');
811 Out << "((char)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
813 case Type::Int16TyID:
814 Out << "((short)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
816 case Type::Int32TyID:
817 Out << "((int)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
819 case Type::Int64TyID:
820 Out << "((long long)" << cast<ConstantInt>(CPV)->getSExtValue() << "ll)";
823 case Type::FloatTyID:
824 case Type::DoubleTyID: {
825 ConstantFP *FPC = cast<ConstantFP>(CPV);
826 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
827 if (I != FPConstantMap.end()) {
828 // Because of FP precision problems we must load from a stack allocated
829 // value that holds the value in hex.
830 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
831 << "*)&FPConstant" << I->second << ')';
833 if (IsNAN(FPC->getValue())) {
836 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
838 const unsigned long QuietNaN = 0x7ff8UL;
839 //const unsigned long SignalNaN = 0x7ff4UL;
841 // We need to grab the first part of the FP #
844 uint64_t ll = DoubleToBits(FPC->getValue());
845 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
847 std::string Num(&Buffer[0], &Buffer[6]);
848 unsigned long Val = strtoul(Num.c_str(), 0, 16);
850 if (FPC->getType() == Type::FloatTy)
851 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
852 << Buffer << "\") /*nan*/ ";
854 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
855 << Buffer << "\") /*nan*/ ";
856 } else if (IsInf(FPC->getValue())) {
858 if (FPC->getValue() < 0) Out << '-';
859 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
863 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
864 // Print out the constant as a floating point number.
866 sprintf(Buffer, "%a", FPC->getValue());
869 Num = ftostr(FPC->getValue());
877 case Type::ArrayTyID:
878 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
879 const ArrayType *AT = cast<ArrayType>(CPV->getType());
881 if (AT->getNumElements()) {
883 Constant *CZ = Constant::getNullValue(AT->getElementType());
885 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
892 printConstantArray(cast<ConstantArray>(CPV));
896 case Type::PackedTyID:
897 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
898 const PackedType *AT = cast<PackedType>(CPV->getType());
900 if (AT->getNumElements()) {
902 Constant *CZ = Constant::getNullValue(AT->getElementType());
904 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
911 printConstantPacked(cast<ConstantPacked>(CPV));
915 case Type::StructTyID:
916 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
917 const StructType *ST = cast<StructType>(CPV->getType());
919 if (ST->getNumElements()) {
921 printConstant(Constant::getNullValue(ST->getElementType(0)));
922 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
924 printConstant(Constant::getNullValue(ST->getElementType(i)));
930 if (CPV->getNumOperands()) {
932 printConstant(cast<Constant>(CPV->getOperand(0)));
933 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
935 printConstant(cast<Constant>(CPV->getOperand(i)));
942 case Type::PointerTyID:
943 if (isa<ConstantPointerNull>(CPV)) {
945 printType(Out, CPV->getType()); // sign doesn't matter
946 Out << ")/*NULL*/0)";
948 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
954 cerr << "Unknown constant type: " << *CPV << "\n";
959 // Some constant expressions need to be casted back to the original types
960 // because their operands were casted to the expected type. This function takes
961 // care of detecting that case and printing the cast for the ConstantExpr.
962 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
963 bool NeedsExplicitCast = false;
964 const Type *Ty = CE->getOperand(0)->getType();
965 bool TypeIsSigned = false;
966 switch (CE->getOpcode()) {
967 case Instruction::LShr:
968 case Instruction::URem:
969 case Instruction::UDiv: NeedsExplicitCast = true; break;
970 case Instruction::AShr:
971 case Instruction::SRem:
972 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
973 case Instruction::SExt:
975 NeedsExplicitCast = true;
978 case Instruction::ZExt:
979 case Instruction::Trunc:
980 case Instruction::FPTrunc:
981 case Instruction::FPExt:
982 case Instruction::UIToFP:
983 case Instruction::SIToFP:
984 case Instruction::FPToUI:
985 case Instruction::FPToSI:
986 case Instruction::PtrToInt:
987 case Instruction::IntToPtr:
988 case Instruction::BitCast:
990 NeedsExplicitCast = true;
994 if (NeedsExplicitCast) {
996 if (Ty->isPrimitiveType())
997 printPrimitiveType(Out, Ty, TypeIsSigned);
1002 return NeedsExplicitCast;
1005 // Print a constant assuming that it is the operand for a given Opcode. The
1006 // opcodes that care about sign need to cast their operands to the expected
1007 // type before the operation proceeds. This function does the casting.
1008 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1010 // Extract the operand's type, we'll need it.
1011 const Type* OpTy = CPV->getType();
1013 // Indicate whether to do the cast or not.
1014 bool shouldCast = false;
1015 bool typeIsSigned = false;
1017 // Based on the Opcode for which this Constant is being written, determine
1018 // the new type to which the operand should be casted by setting the value
1019 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1023 // for most instructions, it doesn't matter
1025 case Instruction::LShr:
1026 case Instruction::UDiv:
1027 case Instruction::URem:
1030 case Instruction::AShr:
1031 case Instruction::SDiv:
1032 case Instruction::SRem:
1034 typeIsSigned = true;
1038 // Write out the casted constant if we should, otherwise just write the
1042 printPrimitiveType(Out, OpTy, typeIsSigned);
1050 void CWriter::writeOperandInternal(Value *Operand) {
1051 if (Instruction *I = dyn_cast<Instruction>(Operand))
1052 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1053 // Should we inline this instruction to build a tree?
1060 Constant* CPV = dyn_cast<Constant>(Operand);
1061 if (CPV && !isa<GlobalValue>(CPV)) {
1064 Out << Mang->getValueName(Operand);
1068 void CWriter::writeOperandRaw(Value *Operand) {
1069 Constant* CPV = dyn_cast<Constant>(Operand);
1070 if (CPV && !isa<GlobalValue>(CPV)) {
1073 Out << Mang->getValueName(Operand);
1077 void CWriter::writeOperand(Value *Operand) {
1078 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1079 Out << "(&"; // Global variables are referenced as their addresses by llvm
1081 writeOperandInternal(Operand);
1083 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1087 // Some instructions need to have their result value casted back to the
1088 // original types because their operands were casted to the expected type.
1089 // This function takes care of detecting that case and printing the cast
1090 // for the Instruction.
1091 bool CWriter::writeInstructionCast(const Instruction &I) {
1092 const Type *Ty = I.getOperand(0)->getType();
1093 switch (I.getOpcode()) {
1094 case Instruction::LShr:
1095 case Instruction::URem:
1096 case Instruction::UDiv:
1098 printPrimitiveType(Out, Ty, false);
1101 case Instruction::AShr:
1102 case Instruction::SRem:
1103 case Instruction::SDiv:
1105 printPrimitiveType(Out, Ty, true);
1113 // Write the operand with a cast to another type based on the Opcode being used.
1114 // This will be used in cases where an instruction has specific type
1115 // requirements (usually signedness) for its operands.
1116 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1118 // Extract the operand's type, we'll need it.
1119 const Type* OpTy = Operand->getType();
1121 // Indicate whether to do the cast or not.
1122 bool shouldCast = false;
1124 // Indicate whether the cast should be to a signed type or not.
1125 bool castIsSigned = false;
1127 // Based on the Opcode for which this Operand is being written, determine
1128 // the new type to which the operand should be casted by setting the value
1129 // of OpTy. If we change OpTy, also set shouldCast to true.
1132 // for most instructions, it doesn't matter
1134 case Instruction::LShr:
1135 case Instruction::UDiv:
1136 case Instruction::URem: // Cast to unsigned first
1138 castIsSigned = false;
1140 case Instruction::AShr:
1141 case Instruction::SDiv:
1142 case Instruction::SRem: // Cast to signed first
1144 castIsSigned = true;
1148 // Write out the casted operand if we should, otherwise just write the
1152 printPrimitiveType(Out, OpTy, castIsSigned);
1154 writeOperand(Operand);
1157 writeOperand(Operand);
1160 // Write the operand with a cast to another type based on the icmp predicate
1162 void CWriter::writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate) {
1164 // Extract the operand's type, we'll need it.
1165 const Type* OpTy = Operand->getType();
1167 // Indicate whether to do the cast or not.
1168 bool shouldCast = false;
1170 // Indicate whether the cast should be to a signed type or not.
1171 bool castIsSigned = false;
1173 // Based on the Opcode for which this Operand is being written, determine
1174 // the new type to which the operand should be casted by setting the value
1175 // of OpTy. If we change OpTy, also set shouldCast to true.
1176 switch (predicate) {
1178 // for eq and ne, it doesn't matter
1180 case ICmpInst::ICMP_UGT:
1181 case ICmpInst::ICMP_UGE:
1182 case ICmpInst::ICMP_ULT:
1183 case ICmpInst::ICMP_ULE:
1186 case ICmpInst::ICMP_SGT:
1187 case ICmpInst::ICMP_SGE:
1188 case ICmpInst::ICMP_SLT:
1189 case ICmpInst::ICMP_SLE:
1191 castIsSigned = true;
1195 // Write out the casted operand if we should, otherwise just write the
1199 if (OpTy->isPrimitiveType())
1200 printPrimitiveType(Out, OpTy, castIsSigned);
1202 printType(Out, OpTy);
1204 writeOperand(Operand);
1207 writeOperand(Operand);
1210 // generateCompilerSpecificCode - This is where we add conditional compilation
1211 // directives to cater to specific compilers as need be.
1213 static void generateCompilerSpecificCode(std::ostream& Out) {
1214 // Alloca is hard to get, and we don't want to include stdlib.h here.
1215 Out << "/* get a declaration for alloca */\n"
1216 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1217 << "extern void *_alloca(unsigned long);\n"
1218 << "#define alloca(x) _alloca(x)\n"
1219 << "#elif defined(__APPLE__)\n"
1220 << "extern void *__builtin_alloca(unsigned long);\n"
1221 << "#define alloca(x) __builtin_alloca(x)\n"
1222 << "#define longjmp _longjmp\n"
1223 << "#define setjmp _setjmp\n"
1224 << "#elif defined(__sun__)\n"
1225 << "#if defined(__sparcv9)\n"
1226 << "extern void *__builtin_alloca(unsigned long);\n"
1228 << "extern void *__builtin_alloca(unsigned int);\n"
1230 << "#define alloca(x) __builtin_alloca(x)\n"
1231 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1232 << "#define alloca(x) __builtin_alloca(x)\n"
1233 << "#elif !defined(_MSC_VER)\n"
1234 << "#include <alloca.h>\n"
1237 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1238 // If we aren't being compiled with GCC, just drop these attributes.
1239 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1240 << "#define __attribute__(X)\n"
1243 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1244 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1245 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1246 << "#elif defined(__GNUC__)\n"
1247 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1249 << "#define __EXTERNAL_WEAK__\n"
1252 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1253 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1254 << "#define __ATTRIBUTE_WEAK__\n"
1255 << "#elif defined(__GNUC__)\n"
1256 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1258 << "#define __ATTRIBUTE_WEAK__\n"
1261 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1262 // From the GCC documentation:
1264 // double __builtin_nan (const char *str)
1266 // This is an implementation of the ISO C99 function nan.
1268 // Since ISO C99 defines this function in terms of strtod, which we do
1269 // not implement, a description of the parsing is in order. The string is
1270 // parsed as by strtol; that is, the base is recognized by leading 0 or
1271 // 0x prefixes. The number parsed is placed in the significand such that
1272 // the least significant bit of the number is at the least significant
1273 // bit of the significand. The number is truncated to fit the significand
1274 // field provided. The significand is forced to be a quiet NaN.
1276 // This function, if given a string literal, is evaluated early enough
1277 // that it is considered a compile-time constant.
1279 // float __builtin_nanf (const char *str)
1281 // Similar to __builtin_nan, except the return type is float.
1283 // double __builtin_inf (void)
1285 // Similar to __builtin_huge_val, except a warning is generated if the
1286 // target floating-point format does not support infinities. This
1287 // function is suitable for implementing the ISO C99 macro INFINITY.
1289 // float __builtin_inff (void)
1291 // Similar to __builtin_inf, except the return type is float.
1292 Out << "#ifdef __GNUC__\n"
1293 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1294 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1295 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1296 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1297 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1298 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1299 << "#define LLVM_PREFETCH(addr,rw,locality) "
1300 "__builtin_prefetch(addr,rw,locality)\n"
1301 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1302 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1303 << "#define LLVM_ASM __asm__\n"
1305 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1306 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1307 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1308 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1309 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1310 << "#define LLVM_INFF 0.0F /* Float */\n"
1311 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1312 << "#define __ATTRIBUTE_CTOR__\n"
1313 << "#define __ATTRIBUTE_DTOR__\n"
1314 << "#define LLVM_ASM(X)\n"
1317 // Output target-specific code that should be inserted into main.
1318 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1319 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1320 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1321 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1322 << "defined(__x86_64__)\n"
1323 << "#undef CODE_FOR_MAIN\n"
1324 << "#define CODE_FOR_MAIN() \\\n"
1325 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1326 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1327 << "#endif\n#endif\n";
1331 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1332 /// the StaticTors set.
1333 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1334 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1335 if (!InitList) return;
1337 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1338 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1339 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1341 if (CS->getOperand(1)->isNullValue())
1342 return; // Found a null terminator, exit printing.
1343 Constant *FP = CS->getOperand(1);
1344 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1346 FP = CE->getOperand(0);
1347 if (Function *F = dyn_cast<Function>(FP))
1348 StaticTors.insert(F);
1352 enum SpecialGlobalClass {
1354 GlobalCtors, GlobalDtors,
1358 /// getGlobalVariableClass - If this is a global that is specially recognized
1359 /// by LLVM, return a code that indicates how we should handle it.
1360 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1361 // If this is a global ctors/dtors list, handle it now.
1362 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1363 if (GV->getName() == "llvm.global_ctors")
1365 else if (GV->getName() == "llvm.global_dtors")
1369 // Otherwise, it it is other metadata, don't print it. This catches things
1370 // like debug information.
1371 if (GV->getSection() == "llvm.metadata")
1378 bool CWriter::doInitialization(Module &M) {
1382 IL.AddPrototypes(M);
1384 // Ensure that all structure types have names...
1385 Mang = new Mangler(M);
1386 Mang->markCharUnacceptable('.');
1388 // Keep track of which functions are static ctors/dtors so they can have
1389 // an attribute added to their prototypes.
1390 std::set<Function*> StaticCtors, StaticDtors;
1391 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1393 switch (getGlobalVariableClass(I)) {
1396 FindStaticTors(I, StaticCtors);
1399 FindStaticTors(I, StaticDtors);
1404 // get declaration for alloca
1405 Out << "/* Provide Declarations */\n";
1406 Out << "#include <stdarg.h>\n"; // Varargs support
1407 Out << "#include <setjmp.h>\n"; // Unwind support
1408 generateCompilerSpecificCode(Out);
1410 // Provide a definition for `bool' if not compiling with a C++ compiler.
1412 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1414 << "\n\n/* Support for floating point constants */\n"
1415 << "typedef unsigned long long ConstantDoubleTy;\n"
1416 << "typedef unsigned int ConstantFloatTy;\n"
1418 << "\n\n/* Global Declarations */\n";
1420 // First output all the declarations for the program, because C requires
1421 // Functions & globals to be declared before they are used.
1424 // Loop over the symbol table, emitting all named constants...
1425 printModuleTypes(M.getTypeSymbolTable());
1427 // Global variable declarations...
1428 if (!M.global_empty()) {
1429 Out << "\n/* External Global Variable Declarations */\n";
1430 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1432 if (I->hasExternalLinkage()) {
1434 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1436 } else if (I->hasDLLImportLinkage()) {
1437 Out << "__declspec(dllimport) ";
1438 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1440 } else if (I->hasExternalWeakLinkage()) {
1442 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1443 Out << " __EXTERNAL_WEAK__ ;\n";
1448 // Function declarations
1449 Out << "\n/* Function Declarations */\n";
1450 Out << "double fmod(double, double);\n"; // Support for FP rem
1451 Out << "float fmodf(float, float);\n";
1453 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1454 // Don't print declarations for intrinsic functions.
1455 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1456 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1457 if (I->hasExternalWeakLinkage())
1459 printFunctionSignature(I, true);
1460 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1461 Out << " __ATTRIBUTE_WEAK__";
1462 if (I->hasExternalWeakLinkage())
1463 Out << " __EXTERNAL_WEAK__";
1464 if (StaticCtors.count(I))
1465 Out << " __ATTRIBUTE_CTOR__";
1466 if (StaticDtors.count(I))
1467 Out << " __ATTRIBUTE_DTOR__";
1469 if (I->hasName() && I->getName()[0] == 1)
1470 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1476 // Output the global variable declarations
1477 if (!M.global_empty()) {
1478 Out << "\n\n/* Global Variable Declarations */\n";
1479 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1481 if (!I->isExternal()) {
1482 // Ignore special globals, such as debug info.
1483 if (getGlobalVariableClass(I))
1486 if (I->hasInternalLinkage())
1490 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1492 if (I->hasLinkOnceLinkage())
1493 Out << " __attribute__((common))";
1494 else if (I->hasWeakLinkage())
1495 Out << " __ATTRIBUTE_WEAK__";
1496 else if (I->hasExternalWeakLinkage())
1497 Out << " __EXTERNAL_WEAK__";
1502 // Output the global variable definitions and contents...
1503 if (!M.global_empty()) {
1504 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1505 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1507 if (!I->isExternal()) {
1508 // Ignore special globals, such as debug info.
1509 if (getGlobalVariableClass(I))
1512 if (I->hasInternalLinkage())
1514 else if (I->hasDLLImportLinkage())
1515 Out << "__declspec(dllimport) ";
1516 else if (I->hasDLLExportLinkage())
1517 Out << "__declspec(dllexport) ";
1519 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1520 if (I->hasLinkOnceLinkage())
1521 Out << " __attribute__((common))";
1522 else if (I->hasWeakLinkage())
1523 Out << " __ATTRIBUTE_WEAK__";
1525 // If the initializer is not null, emit the initializer. If it is null,
1526 // we try to avoid emitting large amounts of zeros. The problem with
1527 // this, however, occurs when the variable has weak linkage. In this
1528 // case, the assembler will complain about the variable being both weak
1529 // and common, so we disable this optimization.
1530 if (!I->getInitializer()->isNullValue()) {
1532 writeOperand(I->getInitializer());
1533 } else if (I->hasWeakLinkage()) {
1534 // We have to specify an initializer, but it doesn't have to be
1535 // complete. If the value is an aggregate, print out { 0 }, and let
1536 // the compiler figure out the rest of the zeros.
1538 if (isa<StructType>(I->getInitializer()->getType()) ||
1539 isa<ArrayType>(I->getInitializer()->getType()) ||
1540 isa<PackedType>(I->getInitializer()->getType())) {
1543 // Just print it out normally.
1544 writeOperand(I->getInitializer());
1552 Out << "\n\n/* Function Bodies */\n";
1557 /// Output all floating point constants that cannot be printed accurately...
1558 void CWriter::printFloatingPointConstants(Function &F) {
1559 // Scan the module for floating point constants. If any FP constant is used
1560 // in the function, we want to redirect it here so that we do not depend on
1561 // the precision of the printed form, unless the printed form preserves
1564 static unsigned FPCounter = 0;
1565 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1567 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1568 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1569 !FPConstantMap.count(FPC)) {
1570 double Val = FPC->getValue();
1572 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1574 if (FPC->getType() == Type::DoubleTy) {
1575 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1576 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1577 << "ULL; /* " << Val << " */\n";
1578 } else if (FPC->getType() == Type::FloatTy) {
1579 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1580 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1581 << "U; /* " << Val << " */\n";
1583 assert(0 && "Unknown float type!");
1590 /// printSymbolTable - Run through symbol table looking for type names. If a
1591 /// type name is found, emit its declaration...
1593 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1594 Out << "/* Helper union for bitcasts */\n";
1595 Out << "typedef union {\n";
1596 Out << " unsigned int Int32;\n";
1597 Out << " unsigned long long Int64;\n";
1598 Out << " float Float;\n";
1599 Out << " double Double;\n";
1600 Out << "} llvmBitCastUnion;\n";
1602 // We are only interested in the type plane of the symbol table.
1603 TypeSymbolTable::const_iterator I = TST.begin();
1604 TypeSymbolTable::const_iterator End = TST.end();
1606 // If there are no type names, exit early.
1607 if (I == End) return;
1609 // Print out forward declarations for structure types before anything else!
1610 Out << "/* Structure forward decls */\n";
1611 for (; I != End; ++I)
1612 if (const Type *STy = dyn_cast<StructType>(I->second)) {
1613 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1614 Out << Name << ";\n";
1615 TypeNames.insert(std::make_pair(STy, Name));
1620 // Now we can print out typedefs...
1621 Out << "/* Typedefs */\n";
1622 for (I = TST.begin(); I != End; ++I) {
1623 const Type *Ty = cast<Type>(I->second);
1624 std::string Name = "l_" + Mang->makeNameProper(I->first);
1626 printType(Out, Ty, Name);
1632 // Keep track of which structures have been printed so far...
1633 std::set<const StructType *> StructPrinted;
1635 // Loop over all structures then push them into the stack so they are
1636 // printed in the correct order.
1638 Out << "/* Structure contents */\n";
1639 for (I = TST.begin(); I != End; ++I)
1640 if (const StructType *STy = dyn_cast<StructType>(I->second))
1641 // Only print out used types!
1642 printContainedStructs(STy, StructPrinted);
1645 // Push the struct onto the stack and recursively push all structs
1646 // this one depends on.
1648 // TODO: Make this work properly with packed types
1650 void CWriter::printContainedStructs(const Type *Ty,
1651 std::set<const StructType*> &StructPrinted){
1652 // Don't walk through pointers.
1653 if (isa<PointerType>(Ty) || Ty->isPrimitiveType()) return;
1655 // Print all contained types first.
1656 for (Type::subtype_iterator I = Ty->subtype_begin(),
1657 E = Ty->subtype_end(); I != E; ++I)
1658 printContainedStructs(*I, StructPrinted);
1660 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1661 // Check to see if we have already printed this struct.
1662 if (StructPrinted.insert(STy).second) {
1663 // Print structure type out.
1664 std::string Name = TypeNames[STy];
1665 printType(Out, STy, Name, true);
1671 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1672 /// isCStructReturn - Should this function actually return a struct by-value?
1673 bool isCStructReturn = F->getCallingConv() == CallingConv::CSRet;
1675 if (F->hasInternalLinkage()) Out << "static ";
1676 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1677 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1678 switch (F->getCallingConv()) {
1679 case CallingConv::X86_StdCall:
1680 Out << "__stdcall ";
1682 case CallingConv::X86_FastCall:
1683 Out << "__fastcall ";
1687 // Loop over the arguments, printing them...
1688 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1690 std::stringstream FunctionInnards;
1692 // Print out the name...
1693 FunctionInnards << Mang->getValueName(F) << '(';
1695 bool PrintedArg = false;
1696 if (!F->isExternal()) {
1697 if (!F->arg_empty()) {
1698 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1700 // If this is a struct-return function, don't print the hidden
1701 // struct-return argument.
1702 if (isCStructReturn) {
1703 assert(I != E && "Invalid struct return function!");
1707 std::string ArgName;
1708 for (; I != E; ++I) {
1709 if (PrintedArg) FunctionInnards << ", ";
1710 if (I->hasName() || !Prototype)
1711 ArgName = Mang->getValueName(I);
1714 printType(FunctionInnards, I->getType(), ArgName);
1719 // Loop over the arguments, printing them.
1720 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1722 // If this is a struct-return function, don't print the hidden
1723 // struct-return argument.
1724 if (isCStructReturn) {
1725 assert(I != E && "Invalid struct return function!");
1729 for (; I != E; ++I) {
1730 if (PrintedArg) FunctionInnards << ", ";
1731 printType(FunctionInnards, *I);
1736 // Finish printing arguments... if this is a vararg function, print the ...,
1737 // unless there are no known types, in which case, we just emit ().
1739 if (FT->isVarArg() && PrintedArg) {
1740 if (PrintedArg) FunctionInnards << ", ";
1741 FunctionInnards << "..."; // Output varargs portion of signature!
1742 } else if (!FT->isVarArg() && !PrintedArg) {
1743 FunctionInnards << "void"; // ret() -> ret(void) in C.
1745 FunctionInnards << ')';
1747 // Get the return tpe for the function.
1749 if (!isCStructReturn)
1750 RetTy = F->getReturnType();
1752 // If this is a struct-return function, print the struct-return type.
1753 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1756 // Print out the return type and the signature built above.
1757 printType(Out, RetTy, FunctionInnards.str());
1760 static inline bool isFPIntBitCast(const Instruction &I) {
1761 if (!isa<BitCastInst>(I))
1763 const Type *SrcTy = I.getOperand(0)->getType();
1764 const Type *DstTy = I.getType();
1765 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1766 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1769 void CWriter::printFunction(Function &F) {
1770 printFunctionSignature(&F, false);
1773 // If this is a struct return function, handle the result with magic.
1774 if (F.getCallingConv() == CallingConv::CSRet) {
1775 const Type *StructTy =
1776 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1778 printType(Out, StructTy, "StructReturn");
1779 Out << "; /* Struct return temporary */\n";
1782 printType(Out, F.arg_begin()->getType(), Mang->getValueName(F.arg_begin()));
1783 Out << " = &StructReturn;\n";
1786 bool PrintedVar = false;
1788 // print local variable information for the function
1789 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1790 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1792 printType(Out, AI->getAllocatedType(), Mang->getValueName(AI));
1793 Out << "; /* Address-exposed local */\n";
1795 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1797 printType(Out, I->getType(), Mang->getValueName(&*I));
1800 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1802 printType(Out, I->getType(),
1803 Mang->getValueName(&*I)+"__PHI_TEMPORARY");
1808 // We need a temporary for the BitCast to use so it can pluck a value out
1809 // of a union to do the BitCast. This is separate from the need for a
1810 // variable to hold the result of the BitCast.
1811 if (isFPIntBitCast(*I)) {
1812 Out << " llvmBitCastUnion " << Mang->getValueName(&*I)
1813 << "__BITCAST_TEMPORARY;\n";
1821 if (F.hasExternalLinkage() && F.getName() == "main")
1822 Out << " CODE_FOR_MAIN();\n";
1824 // print the basic blocks
1825 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1826 if (Loop *L = LI->getLoopFor(BB)) {
1827 if (L->getHeader() == BB && L->getParentLoop() == 0)
1830 printBasicBlock(BB);
1837 void CWriter::printLoop(Loop *L) {
1838 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1839 << "' to make GCC happy */\n";
1840 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1841 BasicBlock *BB = L->getBlocks()[i];
1842 Loop *BBLoop = LI->getLoopFor(BB);
1844 printBasicBlock(BB);
1845 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
1848 Out << " } while (1); /* end of syntactic loop '"
1849 << L->getHeader()->getName() << "' */\n";
1852 void CWriter::printBasicBlock(BasicBlock *BB) {
1854 // Don't print the label for the basic block if there are no uses, or if
1855 // the only terminator use is the predecessor basic block's terminator.
1856 // We have to scan the use list because PHI nodes use basic blocks too but
1857 // do not require a label to be generated.
1859 bool NeedsLabel = false;
1860 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
1861 if (isGotoCodeNecessary(*PI, BB)) {
1866 if (NeedsLabel) Out << Mang->getValueName(BB) << ":\n";
1868 // Output all of the instructions in the basic block...
1869 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
1871 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
1872 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
1881 // Don't emit prefix or suffix for the terminator...
1882 visit(*BB->getTerminator());
1886 // Specific Instruction type classes... note that all of the casts are
1887 // necessary because we use the instruction classes as opaque types...
1889 void CWriter::visitReturnInst(ReturnInst &I) {
1890 // If this is a struct return function, return the temporary struct.
1891 if (I.getParent()->getParent()->getCallingConv() == CallingConv::CSRet) {
1892 Out << " return StructReturn;\n";
1896 // Don't output a void return if this is the last basic block in the function
1897 if (I.getNumOperands() == 0 &&
1898 &*--I.getParent()->getParent()->end() == I.getParent() &&
1899 !I.getParent()->size() == 1) {
1904 if (I.getNumOperands()) {
1906 writeOperand(I.getOperand(0));
1911 void CWriter::visitSwitchInst(SwitchInst &SI) {
1914 writeOperand(SI.getOperand(0));
1915 Out << ") {\n default:\n";
1916 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
1917 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
1919 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
1921 writeOperand(SI.getOperand(i));
1923 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
1924 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
1925 printBranchToBlock(SI.getParent(), Succ, 2);
1926 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
1932 void CWriter::visitUnreachableInst(UnreachableInst &I) {
1933 Out << " /*UNREACHABLE*/;\n";
1936 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
1937 /// FIXME: This should be reenabled, but loop reordering safe!!
1940 if (next(Function::iterator(From)) != Function::iterator(To))
1941 return true; // Not the direct successor, we need a goto.
1943 //isa<SwitchInst>(From->getTerminator())
1945 if (LI->getLoopFor(From) != LI->getLoopFor(To))
1950 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
1951 BasicBlock *Successor,
1953 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
1954 PHINode *PN = cast<PHINode>(I);
1955 // Now we have to do the printing.
1956 Value *IV = PN->getIncomingValueForBlock(CurBlock);
1957 if (!isa<UndefValue>(IV)) {
1958 Out << std::string(Indent, ' ');
1959 Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = ";
1961 Out << "; /* for PHI node */\n";
1966 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
1968 if (isGotoCodeNecessary(CurBB, Succ)) {
1969 Out << std::string(Indent, ' ') << " goto ";
1975 // Branch instruction printing - Avoid printing out a branch to a basic block
1976 // that immediately succeeds the current one.
1978 void CWriter::visitBranchInst(BranchInst &I) {
1980 if (I.isConditional()) {
1981 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
1983 writeOperand(I.getCondition());
1986 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
1987 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
1989 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
1990 Out << " } else {\n";
1991 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
1992 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
1995 // First goto not necessary, assume second one is...
1997 writeOperand(I.getCondition());
2000 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2001 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2006 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2007 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2012 // PHI nodes get copied into temporary values at the end of predecessor basic
2013 // blocks. We now need to copy these temporary values into the REAL value for
2015 void CWriter::visitPHINode(PHINode &I) {
2017 Out << "__PHI_TEMPORARY";
2021 void CWriter::visitBinaryOperator(Instruction &I) {
2022 // binary instructions, shift instructions, setCond instructions.
2023 assert(!isa<PointerType>(I.getType()));
2025 // We must cast the results of binary operations which might be promoted.
2026 bool needsCast = false;
2027 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2028 || (I.getType() == Type::FloatTy)) {
2031 printType(Out, I.getType());
2035 // If this is a negation operation, print it out as such. For FP, we don't
2036 // want to print "-0.0 - X".
2037 if (BinaryOperator::isNeg(&I)) {
2039 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2041 } else if (I.getOpcode() == Instruction::FRem) {
2042 // Output a call to fmod/fmodf instead of emitting a%b
2043 if (I.getType() == Type::FloatTy)
2047 writeOperand(I.getOperand(0));
2049 writeOperand(I.getOperand(1));
2053 // Write out the cast of the instruction's value back to the proper type
2055 bool NeedsClosingParens = writeInstructionCast(I);
2057 // Certain instructions require the operand to be forced to a specific type
2058 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2059 // below for operand 1
2060 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2062 switch (I.getOpcode()) {
2063 case Instruction::Add: Out << " + "; break;
2064 case Instruction::Sub: Out << " - "; break;
2065 case Instruction::Mul: Out << '*'; break;
2066 case Instruction::URem:
2067 case Instruction::SRem:
2068 case Instruction::FRem: Out << '%'; break;
2069 case Instruction::UDiv:
2070 case Instruction::SDiv:
2071 case Instruction::FDiv: Out << '/'; break;
2072 case Instruction::And: Out << " & "; break;
2073 case Instruction::Or: Out << " | "; break;
2074 case Instruction::Xor: Out << " ^ "; break;
2075 case Instruction::Shl : Out << " << "; break;
2076 case Instruction::LShr:
2077 case Instruction::AShr: Out << " >> "; break;
2078 default: cerr << "Invalid operator type!" << I; abort();
2081 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2082 if (NeedsClosingParens)
2091 void CWriter::visitICmpInst(ICmpInst &I) {
2092 // We must cast the results of icmp which might be promoted.
2093 bool needsCast = false;
2095 // Write out the cast of the instruction's value back to the proper type
2097 bool NeedsClosingParens = writeInstructionCast(I);
2099 // Certain icmp predicate require the operand to be forced to a specific type
2100 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2101 // below for operand 1
2102 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2104 switch (I.getPredicate()) {
2105 case ICmpInst::ICMP_EQ: Out << " == "; break;
2106 case ICmpInst::ICMP_NE: Out << " != "; break;
2107 case ICmpInst::ICMP_ULE:
2108 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2109 case ICmpInst::ICMP_UGE:
2110 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2111 case ICmpInst::ICMP_ULT:
2112 case ICmpInst::ICMP_SLT: Out << " < "; break;
2113 case ICmpInst::ICMP_UGT:
2114 case ICmpInst::ICMP_SGT: Out << " > "; break;
2115 default: cerr << "Invalid icmp predicate!" << I; abort();
2118 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2119 if (NeedsClosingParens)
2127 void CWriter::visitFCmpInst(FCmpInst &I) {
2128 // Write the first operand
2129 writeOperand(I.getOperand(0));
2131 // Write the predicate
2132 switch (I.getPredicate()) {
2133 case FCmpInst::FCMP_FALSE: Out << " 0 "; break;
2134 case FCmpInst::FCMP_ORD:
2135 case FCmpInst::FCMP_OEQ:
2136 case FCmpInst::FCMP_UEQ: Out << " == "; break;
2137 case FCmpInst::FCMP_UNO:
2138 case FCmpInst::FCMP_ONE:
2139 case FCmpInst::FCMP_UNE: Out << " != "; break;
2140 case FCmpInst::FCMP_ULE:
2141 case FCmpInst::FCMP_OLE: Out << " <= "; break;
2142 case FCmpInst::FCMP_UGE:
2143 case FCmpInst::FCMP_OGE: Out << " >= "; break;
2144 case FCmpInst::FCMP_ULT:
2145 case FCmpInst::FCMP_OLT: Out << " < "; break;
2146 case FCmpInst::FCMP_UGT:
2147 case FCmpInst::FCMP_OGT: Out << " > "; break;
2148 case FCmpInst::FCMP_TRUE: Out << " 1 "; break;
2149 default: cerr << "Invalid fcmp predicate!" << I; abort();
2151 // Write the second operand
2152 writeOperand(I.getOperand(1));
2155 static const char * getFloatBitCastField(const Type *Ty) {
2156 switch (Ty->getTypeID()) {
2157 default: assert(0 && "Invalid Type");
2158 case Type::FloatTyID: return "Float";
2159 case Type::Int32TyID: return "Int32";
2160 case Type::DoubleTyID: return "Double";
2161 case Type::Int64TyID: return "Int64";
2165 void CWriter::visitCastInst(CastInst &I) {
2166 const Type *DstTy = I.getType();
2167 const Type *SrcTy = I.getOperand(0)->getType();
2169 if (isFPIntBitCast(I)) {
2170 // These int<->float and long<->double casts need to be handled specially
2171 Out << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2172 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2173 writeOperand(I.getOperand(0));
2174 Out << ", " << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2175 << getFloatBitCastField(I.getType());
2177 printCast(I.getOpcode(), SrcTy, DstTy);
2178 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::BoolTy) {
2179 // Make sure we really get a sext from bool by subtracing the bool from 0
2182 writeOperand(I.getOperand(0));
2183 if (DstTy == Type::BoolTy &&
2184 (I.getOpcode() == Instruction::Trunc ||
2185 I.getOpcode() == Instruction::FPToUI ||
2186 I.getOpcode() == Instruction::FPToSI ||
2187 I.getOpcode() == Instruction::PtrToInt)) {
2188 // Make sure we really get a trunc to bool by anding the operand with 1
2195 void CWriter::visitSelectInst(SelectInst &I) {
2197 writeOperand(I.getCondition());
2199 writeOperand(I.getTrueValue());
2201 writeOperand(I.getFalseValue());
2206 void CWriter::lowerIntrinsics(Function &F) {
2207 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2208 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2209 if (CallInst *CI = dyn_cast<CallInst>(I++))
2210 if (Function *F = CI->getCalledFunction())
2211 switch (F->getIntrinsicID()) {
2212 case Intrinsic::not_intrinsic:
2213 case Intrinsic::vastart:
2214 case Intrinsic::vacopy:
2215 case Intrinsic::vaend:
2216 case Intrinsic::returnaddress:
2217 case Intrinsic::frameaddress:
2218 case Intrinsic::setjmp:
2219 case Intrinsic::longjmp:
2220 case Intrinsic::prefetch:
2221 case Intrinsic::dbg_stoppoint:
2222 case Intrinsic::powi_f32:
2223 case Intrinsic::powi_f64:
2224 // We directly implement these intrinsics
2227 // If this is an intrinsic that directly corresponds to a GCC
2228 // builtin, we handle it.
2229 const char *BuiltinName = "";
2230 #define GET_GCC_BUILTIN_NAME
2231 #include "llvm/Intrinsics.gen"
2232 #undef GET_GCC_BUILTIN_NAME
2233 // If we handle it, don't lower it.
2234 if (BuiltinName[0]) break;
2236 // All other intrinsic calls we must lower.
2237 Instruction *Before = 0;
2238 if (CI != &BB->front())
2239 Before = prior(BasicBlock::iterator(CI));
2241 IL.LowerIntrinsicCall(CI);
2242 if (Before) { // Move iterator to instruction after call
2253 void CWriter::visitCallInst(CallInst &I) {
2254 //check if we have inline asm
2255 if (isInlineAsm(I)) {
2260 bool WroteCallee = false;
2262 // Handle intrinsic function calls first...
2263 if (Function *F = I.getCalledFunction())
2264 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2267 // If this is an intrinsic that directly corresponds to a GCC
2268 // builtin, we emit it here.
2269 const char *BuiltinName = "";
2270 #define GET_GCC_BUILTIN_NAME
2271 #include "llvm/Intrinsics.gen"
2272 #undef GET_GCC_BUILTIN_NAME
2273 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2279 case Intrinsic::vastart:
2282 Out << "va_start(*(va_list*)";
2283 writeOperand(I.getOperand(1));
2285 // Output the last argument to the enclosing function...
2286 if (I.getParent()->getParent()->arg_empty()) {
2287 cerr << "The C backend does not currently support zero "
2288 << "argument varargs functions, such as '"
2289 << I.getParent()->getParent()->getName() << "'!\n";
2292 writeOperand(--I.getParent()->getParent()->arg_end());
2295 case Intrinsic::vaend:
2296 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2297 Out << "0; va_end(*(va_list*)";
2298 writeOperand(I.getOperand(1));
2301 Out << "va_end(*(va_list*)0)";
2304 case Intrinsic::vacopy:
2306 Out << "va_copy(*(va_list*)";
2307 writeOperand(I.getOperand(1));
2308 Out << ", *(va_list*)";
2309 writeOperand(I.getOperand(2));
2312 case Intrinsic::returnaddress:
2313 Out << "__builtin_return_address(";
2314 writeOperand(I.getOperand(1));
2317 case Intrinsic::frameaddress:
2318 Out << "__builtin_frame_address(";
2319 writeOperand(I.getOperand(1));
2322 case Intrinsic::powi_f32:
2323 case Intrinsic::powi_f64:
2324 Out << "__builtin_powi(";
2325 writeOperand(I.getOperand(1));
2327 writeOperand(I.getOperand(2));
2330 case Intrinsic::setjmp:
2331 Out << "setjmp(*(jmp_buf*)";
2332 writeOperand(I.getOperand(1));
2335 case Intrinsic::longjmp:
2336 Out << "longjmp(*(jmp_buf*)";
2337 writeOperand(I.getOperand(1));
2339 writeOperand(I.getOperand(2));
2342 case Intrinsic::prefetch:
2343 Out << "LLVM_PREFETCH((const void *)";
2344 writeOperand(I.getOperand(1));
2346 writeOperand(I.getOperand(2));
2348 writeOperand(I.getOperand(3));
2351 case Intrinsic::dbg_stoppoint: {
2352 // If we use writeOperand directly we get a "u" suffix which is rejected
2354 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2358 << " \"" << SPI.getDirectory()
2359 << SPI.getFileName() << "\"\n";
2365 Value *Callee = I.getCalledValue();
2367 // If this is a call to a struct-return function, assign to the first
2368 // parameter instead of passing it to the call.
2369 bool isStructRet = I.getCallingConv() == CallingConv::CSRet;
2372 writeOperand(I.getOperand(1));
2376 if (I.isTailCall()) Out << " /*tail*/ ";
2378 const PointerType *PTy = cast<PointerType>(Callee->getType());
2379 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2382 // If this is an indirect call to a struct return function, we need to cast
2384 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2386 // GCC is a real PITA. It does not permit codegening casts of functions to
2387 // function pointers if they are in a call (it generates a trap instruction
2388 // instead!). We work around this by inserting a cast to void* in between
2389 // the function and the function pointer cast. Unfortunately, we can't just
2390 // form the constant expression here, because the folder will immediately
2393 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2394 // that void* and function pointers have the same size. :( To deal with this
2395 // in the common case, we handle casts where the number of arguments passed
2398 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2400 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2406 // Ok, just cast the pointer type.
2409 printType(Out, I.getCalledValue()->getType());
2411 printStructReturnPointerFunctionType(Out,
2412 cast<PointerType>(I.getCalledValue()->getType()));
2415 writeOperand(Callee);
2416 if (NeedsCast) Out << ')';
2421 unsigned NumDeclaredParams = FTy->getNumParams();
2423 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2425 if (isStructRet) { // Skip struct return argument.
2430 bool PrintedArg = false;
2431 for (; AI != AE; ++AI, ++ArgNo) {
2432 if (PrintedArg) Out << ", ";
2433 if (ArgNo < NumDeclaredParams &&
2434 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2436 printType(Out, FTy->getParamType(ArgNo));
2446 //This converts the llvm constraint string to something gcc is expecting.
2447 //TODO: work out platform independent constraints and factor those out
2448 // of the per target tables
2449 // handle multiple constraint codes
2450 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2452 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2454 const char** table = 0;
2456 //Grab the translation table from TargetAsmInfo if it exists
2459 const TargetMachineRegistry::Entry* Match =
2460 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2462 //Per platform Target Machines don't exist, so create it
2463 // this must be done only once
2464 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2465 TAsm = TM->getTargetAsmInfo();
2469 table = TAsm->getAsmCBE();
2471 //Search the translation table if it exists
2472 for (int i = 0; table && table[i]; i += 2)
2473 if (c.Codes[0] == table[i])
2476 //default is identity
2480 //TODO: import logic from AsmPrinter.cpp
2481 static std::string gccifyAsm(std::string asmstr) {
2482 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2483 if (asmstr[i] == '\n')
2484 asmstr.replace(i, 1, "\\n");
2485 else if (asmstr[i] == '\t')
2486 asmstr.replace(i, 1, "\\t");
2487 else if (asmstr[i] == '$') {
2488 if (asmstr[i + 1] == '{') {
2489 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2490 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2491 std::string n = "%" +
2492 asmstr.substr(a + 1, b - a - 1) +
2493 asmstr.substr(i + 2, a - i - 2);
2494 asmstr.replace(i, b - i + 1, n);
2497 asmstr.replace(i, 1, "%");
2499 else if (asmstr[i] == '%')//grr
2500 { asmstr.replace(i, 1, "%%"); ++i;}
2505 //TODO: assumptions about what consume arguments from the call are likely wrong
2506 // handle communitivity
2507 void CWriter::visitInlineAsm(CallInst &CI) {
2508 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2509 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2510 std::vector<std::pair<std::string, Value*> > Input;
2511 std::vector<std::pair<std::string, Value*> > Output;
2512 std::string Clobber;
2513 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2514 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2515 E = Constraints.end(); I != E; ++I) {
2516 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2518 InterpretASMConstraint(*I);
2521 assert(0 && "Unknown asm constraint");
2523 case InlineAsm::isInput: {
2525 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2526 ++count; //consume arg
2530 case InlineAsm::isOutput: {
2532 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2533 count ? CI.getOperand(count) : &CI));
2534 ++count; //consume arg
2538 case InlineAsm::isClobber: {
2540 Clobber += ",\"" + c + "\"";
2546 //fix up the asm string for gcc
2547 std::string asmstr = gccifyAsm(as->getAsmString());
2549 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2551 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2552 E = Output.end(); I != E; ++I) {
2553 Out << "\"" << I->first << "\"(";
2554 writeOperandRaw(I->second);
2560 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2561 E = Input.end(); I != E; ++I) {
2562 Out << "\"" << I->first << "\"(";
2563 writeOperandRaw(I->second);
2569 Out << "\n :" << Clobber.substr(1);
2573 void CWriter::visitMallocInst(MallocInst &I) {
2574 assert(0 && "lowerallocations pass didn't work!");
2577 void CWriter::visitAllocaInst(AllocaInst &I) {
2579 printType(Out, I.getType());
2580 Out << ") alloca(sizeof(";
2581 printType(Out, I.getType()->getElementType());
2583 if (I.isArrayAllocation()) {
2585 writeOperand(I.getOperand(0));
2590 void CWriter::visitFreeInst(FreeInst &I) {
2591 assert(0 && "lowerallocations pass didn't work!");
2594 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2595 gep_type_iterator E) {
2596 bool HasImplicitAddress = false;
2597 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2598 if (isa<GlobalValue>(Ptr)) {
2599 HasImplicitAddress = true;
2600 } else if (isDirectAlloca(Ptr)) {
2601 HasImplicitAddress = true;
2605 if (!HasImplicitAddress)
2606 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2608 writeOperandInternal(Ptr);
2612 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2613 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2616 writeOperandInternal(Ptr);
2618 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2620 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2623 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2624 "Can only have implicit address with direct accessing");
2626 if (HasImplicitAddress) {
2628 } else if (CI && CI->isNullValue()) {
2629 gep_type_iterator TmpI = I; ++TmpI;
2631 // Print out the -> operator if possible...
2632 if (TmpI != E && isa<StructType>(*TmpI)) {
2633 Out << (HasImplicitAddress ? "." : "->");
2634 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2640 if (isa<StructType>(*I)) {
2641 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2644 writeOperand(I.getOperand());
2649 void CWriter::visitLoadInst(LoadInst &I) {
2651 if (I.isVolatile()) {
2653 printType(Out, I.getType(), "volatile*");
2657 writeOperand(I.getOperand(0));
2663 void CWriter::visitStoreInst(StoreInst &I) {
2665 if (I.isVolatile()) {
2667 printType(Out, I.getOperand(0)->getType(), " volatile*");
2670 writeOperand(I.getPointerOperand());
2671 if (I.isVolatile()) Out << ')';
2673 writeOperand(I.getOperand(0));
2676 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2678 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2682 void CWriter::visitVAArgInst(VAArgInst &I) {
2683 Out << "va_arg(*(va_list*)";
2684 writeOperand(I.getOperand(0));
2686 printType(Out, I.getType());
2690 //===----------------------------------------------------------------------===//
2691 // External Interface declaration
2692 //===----------------------------------------------------------------------===//
2694 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2696 CodeGenFileType FileType,
2698 if (FileType != TargetMachine::AssemblyFile) return true;
2700 PM.add(createLowerGCPass());
2701 PM.add(createLowerAllocationsPass(true));
2702 PM.add(createLowerInvokePass());
2703 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2704 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2705 PM.add(new CWriter(o));