1 //===-- CBackend.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/ParameterAttributes.h"
22 #include "llvm/Pass.h"
23 #include "llvm/PassManager.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/Target/TargetData.h"
36 #include "llvm/Support/CallSite.h"
37 #include "llvm/Support/CFG.h"
38 #include "llvm/Support/GetElementPtrTypeIterator.h"
39 #include "llvm/Support/InstVisitor.h"
40 #include "llvm/Support/Mangler.h"
41 #include "llvm/Support/MathExtras.h"
42 #include "llvm/ADT/StringExtras.h"
43 #include "llvm/ADT/STLExtras.h"
44 #include "llvm/Support/MathExtras.h"
45 #include "llvm/Config/config.h"
51 // Register the target.
52 RegisterTarget<CTargetMachine> X("c", " C backend");
54 /// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
55 /// any unnamed structure types that are used by the program, and merges
56 /// external functions with the same name.
58 class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
59 void getAnalysisUsage(AnalysisUsage &AU) const {
60 AU.addRequired<FindUsedTypes>();
63 virtual const char *getPassName() const {
64 return "C backend type canonicalizer";
67 virtual bool runOnModule(Module &M);
70 /// CWriter - This class is the main chunk of code that converts an LLVM
71 /// module to a C translation unit.
72 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
74 IntrinsicLowering *IL;
77 const Module *TheModule;
78 const TargetAsmInfo* TAsm;
80 std::map<const Type *, std::string> TypeNames;
82 std::map<const ConstantFP *, unsigned> FPConstantMap;
84 CWriter(std::ostream &o) : Out(o), IL(0), Mang(0), LI(0), TheModule(0),
87 virtual const char *getPassName() const { return "C backend"; }
89 void getAnalysisUsage(AnalysisUsage &AU) const {
90 AU.addRequired<LoopInfo>();
94 virtual bool doInitialization(Module &M);
96 bool runOnFunction(Function &F) {
97 LI = &getAnalysis<LoopInfo>();
99 // Get rid of intrinsics we can't handle.
102 // Output all floating point constants that cannot be printed accurately.
103 printFloatingPointConstants(F);
106 FPConstantMap.clear();
110 virtual bool doFinalization(Module &M) {
117 std::ostream &printType(std::ostream &Out, const Type *Ty,
118 bool isSigned = false,
119 const std::string &VariableName = "",
120 bool IgnoreName = false);
121 std::ostream &printSimpleType(std::ostream &Out, const Type *Ty,
123 const std::string &NameSoFar = "");
125 void printStructReturnPointerFunctionType(std::ostream &Out,
126 const PointerType *Ty);
128 void writeOperand(Value *Operand);
129 void writeOperandRaw(Value *Operand);
130 void writeOperandInternal(Value *Operand);
131 void writeOperandWithCast(Value* Operand, unsigned Opcode);
132 void writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate);
133 bool writeInstructionCast(const Instruction &I);
136 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
138 void lowerIntrinsics(Function &F);
140 void printModule(Module *M);
141 void printModuleTypes(const TypeSymbolTable &ST);
142 void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
143 void printFloatingPointConstants(Function &F);
144 void printFunctionSignature(const Function *F, bool Prototype);
146 void printFunction(Function &);
147 void printBasicBlock(BasicBlock *BB);
148 void printLoop(Loop *L);
150 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
151 void printConstant(Constant *CPV);
152 void printConstantWithCast(Constant *CPV, unsigned Opcode);
153 bool printConstExprCast(const ConstantExpr *CE);
154 void printConstantArray(ConstantArray *CPA);
155 void printConstantVector(ConstantVector *CP);
157 // isInlinableInst - Attempt to inline instructions into their uses to build
158 // trees as much as possible. To do this, we have to consistently decide
159 // what is acceptable to inline, so that variable declarations don't get
160 // printed and an extra copy of the expr is not emitted.
162 static bool isInlinableInst(const Instruction &I) {
163 // Always inline cmp instructions, even if they are shared by multiple
164 // expressions. GCC generates horrible code if we don't.
168 // Must be an expression, must be used exactly once. If it is dead, we
169 // emit it inline where it would go.
170 if (I.getType() == Type::VoidTy || !I.hasOneUse() ||
171 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
172 isa<LoadInst>(I) || isa<VAArgInst>(I))
173 // Don't inline a load across a store or other bad things!
176 // Must not be used in inline asm
177 if (I.hasOneUse() && isInlineAsm(*I.use_back())) return false;
179 // Only inline instruction it if it's use is in the same BB as the inst.
180 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
183 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
184 // variables which are accessed with the & operator. This causes GCC to
185 // generate significantly better code than to emit alloca calls directly.
187 static const AllocaInst *isDirectAlloca(const Value *V) {
188 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
189 if (!AI) return false;
190 if (AI->isArrayAllocation())
191 return 0; // FIXME: we can also inline fixed size array allocas!
192 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
197 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
198 static bool isInlineAsm(const Instruction& I) {
199 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
204 // Instruction visitation functions
205 friend class InstVisitor<CWriter>;
207 void visitReturnInst(ReturnInst &I);
208 void visitBranchInst(BranchInst &I);
209 void visitSwitchInst(SwitchInst &I);
210 void visitInvokeInst(InvokeInst &I) {
211 assert(0 && "Lowerinvoke pass didn't work!");
214 void visitUnwindInst(UnwindInst &I) {
215 assert(0 && "Lowerinvoke pass didn't work!");
217 void visitUnreachableInst(UnreachableInst &I);
219 void visitPHINode(PHINode &I);
220 void visitBinaryOperator(Instruction &I);
221 void visitICmpInst(ICmpInst &I);
222 void visitFCmpInst(FCmpInst &I);
224 void visitCastInst (CastInst &I);
225 void visitSelectInst(SelectInst &I);
226 void visitCallInst (CallInst &I);
227 void visitInlineAsm(CallInst &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 << " " << 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);
254 std::string GetValueName(const Value *Operand);
258 /// This method inserts names for any unnamed structure types that are used by
259 /// the program, and removes names from structure types that are not used by the
262 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
263 // Get a set of types that are used by the program...
264 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
266 // Loop over the module symbol table, removing types from UT that are
267 // already named, and removing names for types that are not used.
269 TypeSymbolTable &TST = M.getTypeSymbolTable();
270 for (TypeSymbolTable::iterator TI = TST.begin(), TE = TST.end();
272 TypeSymbolTable::iterator I = TI++;
274 // If this isn't a struct type, remove it from our set of types to name.
275 // This simplifies emission later.
276 if (!isa<StructType>(I->second) && !isa<OpaqueType>(I->second)) {
279 // If this is not used, remove it from the symbol table.
280 std::set<const Type *>::iterator UTI = UT.find(I->second);
284 UT.erase(UTI); // Only keep one name for this type.
288 // UT now contains types that are not named. Loop over it, naming
291 bool Changed = false;
292 unsigned RenameCounter = 0;
293 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
295 if (const StructType *ST = dyn_cast<StructType>(*I)) {
296 while (M.addTypeName("unnamed"+utostr(RenameCounter), ST))
302 // Loop over all external functions and globals. If we have two with
303 // identical names, merge them.
304 // FIXME: This code should disappear when we don't allow values with the same
305 // names when they have different types!
306 std::map<std::string, GlobalValue*> ExtSymbols;
307 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
309 if (GV->isDeclaration() && GV->hasName()) {
310 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
311 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
313 // Found a conflict, replace this global with the previous one.
314 GlobalValue *OldGV = X.first->second;
315 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
316 GV->eraseFromParent();
321 // Do the same for globals.
322 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
324 GlobalVariable *GV = I++;
325 if (GV->isDeclaration() && GV->hasName()) {
326 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
327 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
329 // Found a conflict, replace this global with the previous one.
330 GlobalValue *OldGV = X.first->second;
331 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
332 GV->eraseFromParent();
341 /// printStructReturnPointerFunctionType - This is like printType for a struct
342 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
343 /// print it as "Struct (*)(...)", for struct return functions.
344 void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
345 const PointerType *TheTy) {
346 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
347 std::stringstream FunctionInnards;
348 FunctionInnards << " (*) (";
349 bool PrintedType = false;
351 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
352 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
354 const ParamAttrsList *Attrs = FTy->getParamAttrs();
355 for (++I; I != E; ++I) {
357 FunctionInnards << ", ";
358 printType(FunctionInnards, *I,
359 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt), "");
362 if (FTy->isVarArg()) {
364 FunctionInnards << ", ...";
365 } else if (!PrintedType) {
366 FunctionInnards << "void";
368 FunctionInnards << ')';
369 std::string tstr = FunctionInnards.str();
370 printType(Out, RetTy,
371 /*isSigned=*/Attrs && Attrs->paramHasAttr(0, ParamAttr::SExt), tstr);
375 CWriter::printSimpleType(std::ostream &Out, const Type *Ty, bool isSigned,
376 const std::string &NameSoFar) {
377 assert((Ty->isPrimitiveType() || Ty->isInteger()) &&
378 "Invalid type for printSimpleType");
379 switch (Ty->getTypeID()) {
380 case Type::VoidTyID: return Out << "void " << NameSoFar;
381 case Type::IntegerTyID: {
382 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
384 return Out << "bool " << NameSoFar;
385 else if (NumBits <= 8)
386 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
387 else if (NumBits <= 16)
388 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
389 else if (NumBits <= 32)
390 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
392 assert(NumBits <= 64 && "Bit widths > 64 not implemented yet");
393 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
396 case Type::FloatTyID: return Out << "float " << NameSoFar;
397 case Type::DoubleTyID: return Out << "double " << NameSoFar;
399 cerr << "Unknown primitive type: " << *Ty << "\n";
404 // Pass the Type* and the variable name and this prints out the variable
407 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
408 bool isSigned, const std::string &NameSoFar,
410 if (Ty->isPrimitiveType() || Ty->isInteger()) {
411 printSimpleType(Out, Ty, isSigned, NameSoFar);
415 // Check to see if the type is named.
416 if (!IgnoreName || isa<OpaqueType>(Ty)) {
417 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
418 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
421 switch (Ty->getTypeID()) {
422 case Type::FunctionTyID: {
423 const FunctionType *FTy = cast<FunctionType>(Ty);
424 std::stringstream FunctionInnards;
425 FunctionInnards << " (" << NameSoFar << ") (";
426 const ParamAttrsList *Attrs = FTy->getParamAttrs();
428 for (FunctionType::param_iterator I = FTy->param_begin(),
429 E = FTy->param_end(); I != E; ++I) {
430 if (I != FTy->param_begin())
431 FunctionInnards << ", ";
432 printType(FunctionInnards, *I,
433 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt), "");
436 if (FTy->isVarArg()) {
437 if (FTy->getNumParams())
438 FunctionInnards << ", ...";
439 } else if (!FTy->getNumParams()) {
440 FunctionInnards << "void";
442 FunctionInnards << ')';
443 std::string tstr = FunctionInnards.str();
444 printType(Out, FTy->getReturnType(),
445 /*isSigned=*/Attrs && Attrs->paramHasAttr(0, ParamAttr::SExt), tstr);
448 case Type::StructTyID: {
449 const StructType *STy = cast<StructType>(Ty);
450 Out << NameSoFar + " {\n";
452 for (StructType::element_iterator I = STy->element_begin(),
453 E = STy->element_end(); I != E; ++I) {
455 printType(Out, *I, false, "field" + utostr(Idx++));
461 case Type::PointerTyID: {
462 const PointerType *PTy = cast<PointerType>(Ty);
463 std::string ptrName = "*" + NameSoFar;
465 if (isa<ArrayType>(PTy->getElementType()) ||
466 isa<VectorType>(PTy->getElementType()))
467 ptrName = "(" + ptrName + ")";
469 return printType(Out, PTy->getElementType(), false, ptrName);
472 case Type::ArrayTyID: {
473 const ArrayType *ATy = cast<ArrayType>(Ty);
474 unsigned NumElements = ATy->getNumElements();
475 if (NumElements == 0) NumElements = 1;
476 return printType(Out, ATy->getElementType(), false,
477 NameSoFar + "[" + utostr(NumElements) + "]");
480 case Type::VectorTyID: {
481 const VectorType *PTy = cast<VectorType>(Ty);
482 unsigned NumElements = PTy->getNumElements();
483 if (NumElements == 0) NumElements = 1;
484 return printType(Out, PTy->getElementType(), false,
485 NameSoFar + "[" + utostr(NumElements) + "]");
488 case Type::OpaqueTyID: {
489 static int Count = 0;
490 std::string TyName = "struct opaque_" + itostr(Count++);
491 assert(TypeNames.find(Ty) == TypeNames.end());
492 TypeNames[Ty] = TyName;
493 return Out << TyName << ' ' << NameSoFar;
496 assert(0 && "Unhandled case in getTypeProps!");
503 void CWriter::printConstantArray(ConstantArray *CPA) {
505 // As a special case, print the array as a string if it is an array of
506 // ubytes or an array of sbytes with positive values.
508 const Type *ETy = CPA->getType()->getElementType();
509 bool isString = (ETy == Type::Int8Ty || ETy == Type::Int8Ty);
511 // Make sure the last character is a null char, as automatically added by C
512 if (isString && (CPA->getNumOperands() == 0 ||
513 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
518 // Keep track of whether the last number was a hexadecimal escape
519 bool LastWasHex = false;
521 // Do not include the last character, which we know is null
522 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
523 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
525 // Print it out literally if it is a printable character. The only thing
526 // to be careful about is when the last letter output was a hex escape
527 // code, in which case we have to be careful not to print out hex digits
528 // explicitly (the C compiler thinks it is a continuation of the previous
529 // character, sheesh...)
531 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
533 if (C == '"' || C == '\\')
540 case '\n': Out << "\\n"; break;
541 case '\t': Out << "\\t"; break;
542 case '\r': Out << "\\r"; break;
543 case '\v': Out << "\\v"; break;
544 case '\a': Out << "\\a"; break;
545 case '\"': Out << "\\\""; break;
546 case '\'': Out << "\\\'"; break;
549 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
550 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
559 if (CPA->getNumOperands()) {
561 printConstant(cast<Constant>(CPA->getOperand(0)));
562 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
564 printConstant(cast<Constant>(CPA->getOperand(i)));
571 void CWriter::printConstantVector(ConstantVector *CP) {
573 if (CP->getNumOperands()) {
575 printConstant(cast<Constant>(CP->getOperand(0)));
576 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
578 printConstant(cast<Constant>(CP->getOperand(i)));
584 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
585 // textually as a double (rather than as a reference to a stack-allocated
586 // variable). We decide this by converting CFP to a string and back into a
587 // double, and then checking whether the conversion results in a bit-equal
588 // double to the original value of CFP. This depends on us and the target C
589 // compiler agreeing on the conversion process (which is pretty likely since we
590 // only deal in IEEE FP).
592 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
593 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
595 sprintf(Buffer, "%a", CFP->getValue());
597 if (!strncmp(Buffer, "0x", 2) ||
598 !strncmp(Buffer, "-0x", 3) ||
599 !strncmp(Buffer, "+0x", 3))
600 return atof(Buffer) == CFP->getValue();
603 std::string StrVal = ftostr(CFP->getValue());
605 while (StrVal[0] == ' ')
606 StrVal.erase(StrVal.begin());
608 // Check to make sure that the stringized number is not some string like "Inf"
609 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
610 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
611 ((StrVal[0] == '-' || StrVal[0] == '+') &&
612 (StrVal[1] >= '0' && StrVal[1] <= '9')))
613 // Reparse stringized version!
614 return atof(StrVal.c_str()) == CFP->getValue();
619 /// Print out the casting for a cast operation. This does the double casting
620 /// necessary for conversion to the destination type, if necessary.
621 /// @brief Print a cast
622 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
623 // Print the destination type cast
625 case Instruction::UIToFP:
626 case Instruction::SIToFP:
627 case Instruction::IntToPtr:
628 case Instruction::Trunc:
629 case Instruction::BitCast:
630 case Instruction::FPExt:
631 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
633 printType(Out, DstTy);
636 case Instruction::ZExt:
637 case Instruction::PtrToInt:
638 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
640 printSimpleType(Out, DstTy, false);
643 case Instruction::SExt:
644 case Instruction::FPToSI: // For these, make sure we get a signed dest
646 printSimpleType(Out, DstTy, true);
650 assert(0 && "Invalid cast opcode");
653 // Print the source type cast
655 case Instruction::UIToFP:
656 case Instruction::ZExt:
658 printSimpleType(Out, SrcTy, false);
661 case Instruction::SIToFP:
662 case Instruction::SExt:
664 printSimpleType(Out, SrcTy, true);
667 case Instruction::IntToPtr:
668 case Instruction::PtrToInt:
669 // Avoid "cast to pointer from integer of different size" warnings
670 Out << "(unsigned long)";
672 case Instruction::Trunc:
673 case Instruction::BitCast:
674 case Instruction::FPExt:
675 case Instruction::FPTrunc:
676 case Instruction::FPToSI:
677 case Instruction::FPToUI:
678 break; // These don't need a source cast.
680 assert(0 && "Invalid cast opcode");
685 // printConstant - The LLVM Constant to C Constant converter.
686 void CWriter::printConstant(Constant *CPV) {
687 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
688 switch (CE->getOpcode()) {
689 case Instruction::Trunc:
690 case Instruction::ZExt:
691 case Instruction::SExt:
692 case Instruction::FPTrunc:
693 case Instruction::FPExt:
694 case Instruction::UIToFP:
695 case Instruction::SIToFP:
696 case Instruction::FPToUI:
697 case Instruction::FPToSI:
698 case Instruction::PtrToInt:
699 case Instruction::IntToPtr:
700 case Instruction::BitCast:
702 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
703 if (CE->getOpcode() == Instruction::SExt &&
704 CE->getOperand(0)->getType() == Type::Int1Ty) {
705 // Make sure we really sext from bool here by subtracting from 0
708 printConstant(CE->getOperand(0));
709 if (CE->getType() == Type::Int1Ty &&
710 (CE->getOpcode() == Instruction::Trunc ||
711 CE->getOpcode() == Instruction::FPToUI ||
712 CE->getOpcode() == Instruction::FPToSI ||
713 CE->getOpcode() == Instruction::PtrToInt)) {
714 // Make sure we really truncate to bool here by anding with 1
720 case Instruction::GetElementPtr:
722 printIndexingExpression(CE->getOperand(0), gep_type_begin(CPV),
726 case Instruction::Select:
728 printConstant(CE->getOperand(0));
730 printConstant(CE->getOperand(1));
732 printConstant(CE->getOperand(2));
735 case Instruction::Add:
736 case Instruction::Sub:
737 case Instruction::Mul:
738 case Instruction::SDiv:
739 case Instruction::UDiv:
740 case Instruction::FDiv:
741 case Instruction::URem:
742 case Instruction::SRem:
743 case Instruction::FRem:
744 case Instruction::And:
745 case Instruction::Or:
746 case Instruction::Xor:
747 case Instruction::ICmp:
748 case Instruction::Shl:
749 case Instruction::LShr:
750 case Instruction::AShr:
753 bool NeedsClosingParens = printConstExprCast(CE);
754 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
755 switch (CE->getOpcode()) {
756 case Instruction::Add: Out << " + "; break;
757 case Instruction::Sub: Out << " - "; break;
758 case Instruction::Mul: Out << " * "; break;
759 case Instruction::URem:
760 case Instruction::SRem:
761 case Instruction::FRem: Out << " % "; break;
762 case Instruction::UDiv:
763 case Instruction::SDiv:
764 case Instruction::FDiv: Out << " / "; break;
765 case Instruction::And: Out << " & "; break;
766 case Instruction::Or: Out << " | "; break;
767 case Instruction::Xor: Out << " ^ "; break;
768 case Instruction::Shl: Out << " << "; break;
769 case Instruction::LShr:
770 case Instruction::AShr: Out << " >> "; break;
771 case Instruction::ICmp:
772 switch (CE->getPredicate()) {
773 case ICmpInst::ICMP_EQ: Out << " == "; break;
774 case ICmpInst::ICMP_NE: Out << " != "; break;
775 case ICmpInst::ICMP_SLT:
776 case ICmpInst::ICMP_ULT: Out << " < "; break;
777 case ICmpInst::ICMP_SLE:
778 case ICmpInst::ICMP_ULE: Out << " <= "; break;
779 case ICmpInst::ICMP_SGT:
780 case ICmpInst::ICMP_UGT: Out << " > "; break;
781 case ICmpInst::ICMP_SGE:
782 case ICmpInst::ICMP_UGE: Out << " >= "; break;
783 default: assert(0 && "Illegal ICmp predicate");
786 default: assert(0 && "Illegal opcode here!");
788 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
789 if (NeedsClosingParens)
794 case Instruction::FCmp: {
796 bool NeedsClosingParens = printConstExprCast(CE);
797 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
799 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
803 switch (CE->getPredicate()) {
804 default: assert(0 && "Illegal FCmp predicate");
805 case FCmpInst::FCMP_ORD: op = "ord"; break;
806 case FCmpInst::FCMP_UNO: op = "uno"; break;
807 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
808 case FCmpInst::FCMP_UNE: op = "une"; break;
809 case FCmpInst::FCMP_ULT: op = "ult"; break;
810 case FCmpInst::FCMP_ULE: op = "ule"; break;
811 case FCmpInst::FCMP_UGT: op = "ugt"; break;
812 case FCmpInst::FCMP_UGE: op = "uge"; break;
813 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
814 case FCmpInst::FCMP_ONE: op = "one"; break;
815 case FCmpInst::FCMP_OLT: op = "olt"; break;
816 case FCmpInst::FCMP_OLE: op = "ole"; break;
817 case FCmpInst::FCMP_OGT: op = "ogt"; break;
818 case FCmpInst::FCMP_OGE: op = "oge"; break;
820 Out << "llvm_fcmp_" << op << "(";
821 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
823 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
826 if (NeedsClosingParens)
831 cerr << "CWriter Error: Unhandled constant expression: "
835 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
837 printType(Out, CPV->getType()); // sign doesn't matter
838 Out << ")/*UNDEF*/0)";
842 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
843 const Type* Ty = CI->getType();
844 if (Ty == Type::Int1Ty)
845 Out << (CI->getZExtValue() ? '1' : '0') ;
848 printSimpleType(Out, Ty, false) << ')';
849 if (CI->isMinValue(true))
850 Out << CI->getZExtValue() << 'u';
852 Out << CI->getSExtValue();
853 if (Ty->getPrimitiveSizeInBits() > 32)
860 switch (CPV->getType()->getTypeID()) {
861 case Type::FloatTyID:
862 case Type::DoubleTyID: {
863 ConstantFP *FPC = cast<ConstantFP>(CPV);
864 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
865 if (I != FPConstantMap.end()) {
866 // Because of FP precision problems we must load from a stack allocated
867 // value that holds the value in hex.
868 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
869 << "*)&FPConstant" << I->second << ')';
871 if (IsNAN(FPC->getValue())) {
874 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
876 const unsigned long QuietNaN = 0x7ff8UL;
877 //const unsigned long SignalNaN = 0x7ff4UL;
879 // We need to grab the first part of the FP #
882 uint64_t ll = DoubleToBits(FPC->getValue());
883 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
885 std::string Num(&Buffer[0], &Buffer[6]);
886 unsigned long Val = strtoul(Num.c_str(), 0, 16);
888 if (FPC->getType() == Type::FloatTy)
889 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
890 << Buffer << "\") /*nan*/ ";
892 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
893 << Buffer << "\") /*nan*/ ";
894 } else if (IsInf(FPC->getValue())) {
896 if (FPC->getValue() < 0) Out << '-';
897 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
901 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
902 // Print out the constant as a floating point number.
904 sprintf(Buffer, "%a", FPC->getValue());
907 Num = ftostr(FPC->getValue());
915 case Type::ArrayTyID:
916 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
917 const ArrayType *AT = cast<ArrayType>(CPV->getType());
919 if (AT->getNumElements()) {
921 Constant *CZ = Constant::getNullValue(AT->getElementType());
923 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
930 printConstantArray(cast<ConstantArray>(CPV));
934 case Type::VectorTyID:
935 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
936 const VectorType *AT = cast<VectorType>(CPV->getType());
938 if (AT->getNumElements()) {
940 Constant *CZ = Constant::getNullValue(AT->getElementType());
942 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
949 printConstantVector(cast<ConstantVector>(CPV));
953 case Type::StructTyID:
954 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
955 const StructType *ST = cast<StructType>(CPV->getType());
957 if (ST->getNumElements()) {
959 printConstant(Constant::getNullValue(ST->getElementType(0)));
960 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
962 printConstant(Constant::getNullValue(ST->getElementType(i)));
968 if (CPV->getNumOperands()) {
970 printConstant(cast<Constant>(CPV->getOperand(0)));
971 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
973 printConstant(cast<Constant>(CPV->getOperand(i)));
980 case Type::PointerTyID:
981 if (isa<ConstantPointerNull>(CPV)) {
983 printType(Out, CPV->getType()); // sign doesn't matter
984 Out << ")/*NULL*/0)";
986 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
992 cerr << "Unknown constant type: " << *CPV << "\n";
997 // Some constant expressions need to be casted back to the original types
998 // because their operands were casted to the expected type. This function takes
999 // care of detecting that case and printing the cast for the ConstantExpr.
1000 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
1001 bool NeedsExplicitCast = false;
1002 const Type *Ty = CE->getOperand(0)->getType();
1003 bool TypeIsSigned = false;
1004 switch (CE->getOpcode()) {
1005 case Instruction::LShr:
1006 case Instruction::URem:
1007 case Instruction::UDiv: NeedsExplicitCast = true; break;
1008 case Instruction::AShr:
1009 case Instruction::SRem:
1010 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1011 case Instruction::SExt:
1013 NeedsExplicitCast = true;
1014 TypeIsSigned = true;
1016 case Instruction::ZExt:
1017 case Instruction::Trunc:
1018 case Instruction::FPTrunc:
1019 case Instruction::FPExt:
1020 case Instruction::UIToFP:
1021 case Instruction::SIToFP:
1022 case Instruction::FPToUI:
1023 case Instruction::FPToSI:
1024 case Instruction::PtrToInt:
1025 case Instruction::IntToPtr:
1026 case Instruction::BitCast:
1028 NeedsExplicitCast = true;
1032 if (NeedsExplicitCast) {
1034 if (Ty->isInteger() && Ty != Type::Int1Ty)
1035 printSimpleType(Out, Ty, TypeIsSigned);
1037 printType(Out, Ty); // not integer, sign doesn't matter
1040 return NeedsExplicitCast;
1043 // Print a constant assuming that it is the operand for a given Opcode. The
1044 // opcodes that care about sign need to cast their operands to the expected
1045 // type before the operation proceeds. This function does the casting.
1046 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1048 // Extract the operand's type, we'll need it.
1049 const Type* OpTy = CPV->getType();
1051 // Indicate whether to do the cast or not.
1052 bool shouldCast = false;
1053 bool typeIsSigned = false;
1055 // Based on the Opcode for which this Constant is being written, determine
1056 // the new type to which the operand should be casted by setting the value
1057 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1061 // for most instructions, it doesn't matter
1063 case Instruction::LShr:
1064 case Instruction::UDiv:
1065 case Instruction::URem:
1068 case Instruction::AShr:
1069 case Instruction::SDiv:
1070 case Instruction::SRem:
1072 typeIsSigned = true;
1076 // Write out the casted constant if we should, otherwise just write the
1080 printSimpleType(Out, OpTy, typeIsSigned);
1088 std::string CWriter::GetValueName(const Value *Operand) {
1091 if (!isa<GlobalValue>(Operand) && Operand->getName() != "") {
1092 std::string VarName;
1094 Name = Operand->getName();
1095 VarName.reserve(Name.capacity());
1097 for (std::string::iterator I = Name.begin(), E = Name.end();
1101 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1102 (ch >= '0' && ch <= '9') || ch == '_'))
1108 Name = "llvm_cbe_" + VarName;
1110 Name = Mang->getValueName(Operand);
1116 void CWriter::writeOperandInternal(Value *Operand) {
1117 if (Instruction *I = dyn_cast<Instruction>(Operand))
1118 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1119 // Should we inline this instruction to build a tree?
1126 Constant* CPV = dyn_cast<Constant>(Operand);
1128 if (CPV && !isa<GlobalValue>(CPV))
1131 Out << GetValueName(Operand);
1134 void CWriter::writeOperandRaw(Value *Operand) {
1135 Constant* CPV = dyn_cast<Constant>(Operand);
1136 if (CPV && !isa<GlobalValue>(CPV)) {
1139 Out << GetValueName(Operand);
1143 void CWriter::writeOperand(Value *Operand) {
1144 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1145 Out << "(&"; // Global variables are referenced as their addresses by llvm
1147 writeOperandInternal(Operand);
1149 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1153 // Some instructions need to have their result value casted back to the
1154 // original types because their operands were casted to the expected type.
1155 // This function takes care of detecting that case and printing the cast
1156 // for the Instruction.
1157 bool CWriter::writeInstructionCast(const Instruction &I) {
1158 const Type *Ty = I.getOperand(0)->getType();
1159 switch (I.getOpcode()) {
1160 case Instruction::LShr:
1161 case Instruction::URem:
1162 case Instruction::UDiv:
1164 printSimpleType(Out, Ty, false);
1167 case Instruction::AShr:
1168 case Instruction::SRem:
1169 case Instruction::SDiv:
1171 printSimpleType(Out, Ty, true);
1179 // Write the operand with a cast to another type based on the Opcode being used.
1180 // This will be used in cases where an instruction has specific type
1181 // requirements (usually signedness) for its operands.
1182 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1184 // Extract the operand's type, we'll need it.
1185 const Type* OpTy = Operand->getType();
1187 // Indicate whether to do the cast or not.
1188 bool shouldCast = false;
1190 // Indicate whether the cast should be to a signed type or not.
1191 bool castIsSigned = false;
1193 // Based on the Opcode for which this Operand is being written, determine
1194 // the new type to which the operand should be casted by setting the value
1195 // of OpTy. If we change OpTy, also set shouldCast to true.
1198 // for most instructions, it doesn't matter
1200 case Instruction::LShr:
1201 case Instruction::UDiv:
1202 case Instruction::URem: // Cast to unsigned first
1204 castIsSigned = false;
1206 case Instruction::AShr:
1207 case Instruction::SDiv:
1208 case Instruction::SRem: // Cast to signed first
1210 castIsSigned = true;
1214 // Write out the casted operand if we should, otherwise just write the
1218 printSimpleType(Out, OpTy, castIsSigned);
1220 writeOperand(Operand);
1223 writeOperand(Operand);
1226 // Write the operand with a cast to another type based on the icmp predicate
1228 void CWriter::writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate) {
1230 // Extract the operand's type, we'll need it.
1231 const Type* OpTy = Operand->getType();
1233 // Indicate whether to do the cast or not.
1234 bool shouldCast = false;
1236 // Indicate whether the cast should be to a signed type or not.
1237 bool castIsSigned = false;
1239 // Based on the Opcode for which this Operand is being written, determine
1240 // the new type to which the operand should be casted by setting the value
1241 // of OpTy. If we change OpTy, also set shouldCast to true.
1242 switch (predicate) {
1244 // for eq and ne, it doesn't matter
1246 case ICmpInst::ICMP_UGT:
1247 case ICmpInst::ICMP_UGE:
1248 case ICmpInst::ICMP_ULT:
1249 case ICmpInst::ICMP_ULE:
1252 case ICmpInst::ICMP_SGT:
1253 case ICmpInst::ICMP_SGE:
1254 case ICmpInst::ICMP_SLT:
1255 case ICmpInst::ICMP_SLE:
1257 castIsSigned = true;
1261 // Write out the casted operand if we should, otherwise just write the
1265 if (OpTy->isInteger() && OpTy != Type::Int1Ty)
1266 printSimpleType(Out, OpTy, castIsSigned);
1268 printType(Out, OpTy); // not integer, sign doesn't matter
1270 writeOperand(Operand);
1273 writeOperand(Operand);
1276 // generateCompilerSpecificCode - This is where we add conditional compilation
1277 // directives to cater to specific compilers as need be.
1279 static void generateCompilerSpecificCode(std::ostream& Out) {
1280 // Alloca is hard to get, and we don't want to include stdlib.h here.
1281 Out << "/* get a declaration for alloca */\n"
1282 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1283 << "extern void *_alloca(unsigned long);\n"
1284 << "#define alloca(x) _alloca(x)\n"
1285 << "#elif defined(__APPLE__)\n"
1286 << "extern void *__builtin_alloca(unsigned long);\n"
1287 << "#define alloca(x) __builtin_alloca(x)\n"
1288 << "#define longjmp _longjmp\n"
1289 << "#define setjmp _setjmp\n"
1290 << "#elif defined(__sun__)\n"
1291 << "#if defined(__sparcv9)\n"
1292 << "extern void *__builtin_alloca(unsigned long);\n"
1294 << "extern void *__builtin_alloca(unsigned int);\n"
1296 << "#define alloca(x) __builtin_alloca(x)\n"
1297 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1298 << "#define alloca(x) __builtin_alloca(x)\n"
1299 << "#elif defined(_MSC_VER)\n"
1300 << "#define inline _inline\n"
1301 << "#define alloca(x) _alloca(x)\n"
1303 << "#include <alloca.h>\n"
1306 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1307 // If we aren't being compiled with GCC, just drop these attributes.
1308 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1309 << "#define __attribute__(X)\n"
1312 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1313 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1314 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1315 << "#elif defined(__GNUC__)\n"
1316 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1318 << "#define __EXTERNAL_WEAK__\n"
1321 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1322 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1323 << "#define __ATTRIBUTE_WEAK__\n"
1324 << "#elif defined(__GNUC__)\n"
1325 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1327 << "#define __ATTRIBUTE_WEAK__\n"
1330 // Add hidden visibility support. FIXME: APPLE_CC?
1331 Out << "#if defined(__GNUC__)\n"
1332 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1335 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1336 // From the GCC documentation:
1338 // double __builtin_nan (const char *str)
1340 // This is an implementation of the ISO C99 function nan.
1342 // Since ISO C99 defines this function in terms of strtod, which we do
1343 // not implement, a description of the parsing is in order. The string is
1344 // parsed as by strtol; that is, the base is recognized by leading 0 or
1345 // 0x prefixes. The number parsed is placed in the significand such that
1346 // the least significant bit of the number is at the least significant
1347 // bit of the significand. The number is truncated to fit the significand
1348 // field provided. The significand is forced to be a quiet NaN.
1350 // This function, if given a string literal, is evaluated early enough
1351 // that it is considered a compile-time constant.
1353 // float __builtin_nanf (const char *str)
1355 // Similar to __builtin_nan, except the return type is float.
1357 // double __builtin_inf (void)
1359 // Similar to __builtin_huge_val, except a warning is generated if the
1360 // target floating-point format does not support infinities. This
1361 // function is suitable for implementing the ISO C99 macro INFINITY.
1363 // float __builtin_inff (void)
1365 // Similar to __builtin_inf, except the return type is float.
1366 Out << "#ifdef __GNUC__\n"
1367 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1368 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1369 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1370 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1371 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1372 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1373 << "#define LLVM_PREFETCH(addr,rw,locality) "
1374 "__builtin_prefetch(addr,rw,locality)\n"
1375 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1376 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1377 << "#define LLVM_ASM __asm__\n"
1379 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1380 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1381 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1382 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1383 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1384 << "#define LLVM_INFF 0.0F /* Float */\n"
1385 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1386 << "#define __ATTRIBUTE_CTOR__\n"
1387 << "#define __ATTRIBUTE_DTOR__\n"
1388 << "#define LLVM_ASM(X)\n"
1391 // Output target-specific code that should be inserted into main.
1392 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1393 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1394 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1395 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1396 << "defined(__x86_64__)\n"
1397 << "#undef CODE_FOR_MAIN\n"
1398 << "#define CODE_FOR_MAIN() \\\n"
1399 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1400 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1401 << "#endif\n#endif\n";
1405 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1406 /// the StaticTors set.
1407 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1408 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1409 if (!InitList) return;
1411 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1412 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1413 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1415 if (CS->getOperand(1)->isNullValue())
1416 return; // Found a null terminator, exit printing.
1417 Constant *FP = CS->getOperand(1);
1418 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1420 FP = CE->getOperand(0);
1421 if (Function *F = dyn_cast<Function>(FP))
1422 StaticTors.insert(F);
1426 enum SpecialGlobalClass {
1428 GlobalCtors, GlobalDtors,
1432 /// getGlobalVariableClass - If this is a global that is specially recognized
1433 /// by LLVM, return a code that indicates how we should handle it.
1434 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1435 // If this is a global ctors/dtors list, handle it now.
1436 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1437 if (GV->getName() == "llvm.global_ctors")
1439 else if (GV->getName() == "llvm.global_dtors")
1443 // Otherwise, it it is other metadata, don't print it. This catches things
1444 // like debug information.
1445 if (GV->getSection() == "llvm.metadata")
1452 bool CWriter::doInitialization(Module &M) {
1456 TD = new TargetData(&M);
1457 IL = new IntrinsicLowering(*TD);
1458 IL->AddPrototypes(M);
1460 // Ensure that all structure types have names...
1461 Mang = new Mangler(M);
1462 Mang->markCharUnacceptable('.');
1464 // Keep track of which functions are static ctors/dtors so they can have
1465 // an attribute added to their prototypes.
1466 std::set<Function*> StaticCtors, StaticDtors;
1467 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1469 switch (getGlobalVariableClass(I)) {
1472 FindStaticTors(I, StaticCtors);
1475 FindStaticTors(I, StaticDtors);
1480 // get declaration for alloca
1481 Out << "/* Provide Declarations */\n";
1482 Out << "#include <stdarg.h>\n"; // Varargs support
1483 Out << "#include <setjmp.h>\n"; // Unwind support
1484 generateCompilerSpecificCode(Out);
1486 // Provide a definition for `bool' if not compiling with a C++ compiler.
1488 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1490 << "\n\n/* Support for floating point constants */\n"
1491 << "typedef unsigned long long ConstantDoubleTy;\n"
1492 << "typedef unsigned int ConstantFloatTy;\n"
1494 << "\n\n/* Global Declarations */\n";
1496 // First output all the declarations for the program, because C requires
1497 // Functions & globals to be declared before they are used.
1500 // Loop over the symbol table, emitting all named constants...
1501 printModuleTypes(M.getTypeSymbolTable());
1503 // Global variable declarations...
1504 if (!M.global_empty()) {
1505 Out << "\n/* External Global Variable Declarations */\n";
1506 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1508 if (I->hasExternalLinkage()) {
1510 printType(Out, I->getType()->getElementType(), false,
1513 } else if (I->hasDLLImportLinkage()) {
1514 Out << "__declspec(dllimport) ";
1515 printType(Out, I->getType()->getElementType(), false,
1518 } else if (I->hasExternalWeakLinkage()) {
1520 printType(Out, I->getType()->getElementType(), false,
1522 Out << " __EXTERNAL_WEAK__ ;\n";
1527 // Function declarations
1528 Out << "\n/* Function Declarations */\n";
1529 Out << "double fmod(double, double);\n"; // Support for FP rem
1530 Out << "float fmodf(float, float);\n";
1532 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1533 // Don't print declarations for intrinsic functions.
1534 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1535 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1536 if (I->hasExternalWeakLinkage())
1538 printFunctionSignature(I, true);
1539 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1540 Out << " __ATTRIBUTE_WEAK__";
1541 if (I->hasExternalWeakLinkage())
1542 Out << " __EXTERNAL_WEAK__";
1543 if (StaticCtors.count(I))
1544 Out << " __ATTRIBUTE_CTOR__";
1545 if (StaticDtors.count(I))
1546 Out << " __ATTRIBUTE_DTOR__";
1547 if (I->hasHiddenVisibility())
1548 Out << " __HIDDEN__";
1550 if (I->hasName() && I->getName()[0] == 1)
1551 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1557 // Output the global variable declarations
1558 if (!M.global_empty()) {
1559 Out << "\n\n/* Global Variable Declarations */\n";
1560 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1562 if (!I->isDeclaration()) {
1563 // Ignore special globals, such as debug info.
1564 if (getGlobalVariableClass(I))
1567 if (I->hasInternalLinkage())
1571 printType(Out, I->getType()->getElementType(), false,
1574 if (I->hasLinkOnceLinkage())
1575 Out << " __attribute__((common))";
1576 else if (I->hasWeakLinkage())
1577 Out << " __ATTRIBUTE_WEAK__";
1578 else if (I->hasExternalWeakLinkage())
1579 Out << " __EXTERNAL_WEAK__";
1580 if (I->hasHiddenVisibility())
1581 Out << " __HIDDEN__";
1586 // Output the global variable definitions and contents...
1587 if (!M.global_empty()) {
1588 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1589 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1591 if (!I->isDeclaration()) {
1592 // Ignore special globals, such as debug info.
1593 if (getGlobalVariableClass(I))
1596 if (I->hasInternalLinkage())
1598 else if (I->hasDLLImportLinkage())
1599 Out << "__declspec(dllimport) ";
1600 else if (I->hasDLLExportLinkage())
1601 Out << "__declspec(dllexport) ";
1603 printType(Out, I->getType()->getElementType(), false,
1605 if (I->hasLinkOnceLinkage())
1606 Out << " __attribute__((common))";
1607 else if (I->hasWeakLinkage())
1608 Out << " __ATTRIBUTE_WEAK__";
1610 if (I->hasHiddenVisibility())
1611 Out << " __HIDDEN__";
1613 // If the initializer is not null, emit the initializer. If it is null,
1614 // we try to avoid emitting large amounts of zeros. The problem with
1615 // this, however, occurs when the variable has weak linkage. In this
1616 // case, the assembler will complain about the variable being both weak
1617 // and common, so we disable this optimization.
1618 if (!I->getInitializer()->isNullValue()) {
1620 writeOperand(I->getInitializer());
1621 } else if (I->hasWeakLinkage()) {
1622 // We have to specify an initializer, but it doesn't have to be
1623 // complete. If the value is an aggregate, print out { 0 }, and let
1624 // the compiler figure out the rest of the zeros.
1626 if (isa<StructType>(I->getInitializer()->getType()) ||
1627 isa<ArrayType>(I->getInitializer()->getType()) ||
1628 isa<VectorType>(I->getInitializer()->getType())) {
1631 // Just print it out normally.
1632 writeOperand(I->getInitializer());
1640 Out << "\n\n/* Function Bodies */\n";
1642 // Emit some helper functions for dealing with FCMP instruction's
1644 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1645 Out << "return X == X && Y == Y; }\n";
1646 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1647 Out << "return X != X || Y != Y; }\n";
1648 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1649 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1650 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1651 Out << "return X != Y; }\n";
1652 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1653 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1654 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1655 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1656 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1657 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1658 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1659 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1660 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1661 Out << "return X == Y ; }\n";
1662 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1663 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1664 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1665 Out << "return X < Y ; }\n";
1666 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1667 Out << "return X > Y ; }\n";
1668 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1669 Out << "return X <= Y ; }\n";
1670 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1671 Out << "return X >= Y ; }\n";
1676 /// Output all floating point constants that cannot be printed accurately...
1677 void CWriter::printFloatingPointConstants(Function &F) {
1678 // Scan the module for floating point constants. If any FP constant is used
1679 // in the function, we want to redirect it here so that we do not depend on
1680 // the precision of the printed form, unless the printed form preserves
1683 static unsigned FPCounter = 0;
1684 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1686 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1687 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1688 !FPConstantMap.count(FPC)) {
1689 double Val = FPC->getValue();
1691 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1693 if (FPC->getType() == Type::DoubleTy) {
1694 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1695 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1696 << "ULL; /* " << Val << " */\n";
1697 } else if (FPC->getType() == Type::FloatTy) {
1698 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1699 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1700 << "U; /* " << Val << " */\n";
1702 assert(0 && "Unknown float type!");
1709 /// printSymbolTable - Run through symbol table looking for type names. If a
1710 /// type name is found, emit its declaration...
1712 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1713 Out << "/* Helper union for bitcasts */\n";
1714 Out << "typedef union {\n";
1715 Out << " unsigned int Int32;\n";
1716 Out << " unsigned long long Int64;\n";
1717 Out << " float Float;\n";
1718 Out << " double Double;\n";
1719 Out << "} llvmBitCastUnion;\n";
1721 // We are only interested in the type plane of the symbol table.
1722 TypeSymbolTable::const_iterator I = TST.begin();
1723 TypeSymbolTable::const_iterator End = TST.end();
1725 // If there are no type names, exit early.
1726 if (I == End) return;
1728 // Print out forward declarations for structure types before anything else!
1729 Out << "/* Structure forward decls */\n";
1730 for (; I != End; ++I) {
1731 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1732 Out << Name << ";\n";
1733 TypeNames.insert(std::make_pair(I->second, Name));
1738 // Now we can print out typedefs. Above, we guaranteed that this can only be
1739 // for struct or opaque types.
1740 Out << "/* Typedefs */\n";
1741 for (I = TST.begin(); I != End; ++I) {
1742 std::string Name = "l_" + Mang->makeNameProper(I->first);
1744 printType(Out, I->second, false, Name);
1750 // Keep track of which structures have been printed so far...
1751 std::set<const StructType *> StructPrinted;
1753 // Loop over all structures then push them into the stack so they are
1754 // printed in the correct order.
1756 Out << "/* Structure contents */\n";
1757 for (I = TST.begin(); I != End; ++I)
1758 if (const StructType *STy = dyn_cast<StructType>(I->second))
1759 // Only print out used types!
1760 printContainedStructs(STy, StructPrinted);
1763 // Push the struct onto the stack and recursively push all structs
1764 // this one depends on.
1766 // TODO: Make this work properly with vector types
1768 void CWriter::printContainedStructs(const Type *Ty,
1769 std::set<const StructType*> &StructPrinted){
1770 // Don't walk through pointers.
1771 if (isa<PointerType>(Ty) || Ty->isPrimitiveType() || Ty->isInteger()) return;
1773 // Print all contained types first.
1774 for (Type::subtype_iterator I = Ty->subtype_begin(),
1775 E = Ty->subtype_end(); I != E; ++I)
1776 printContainedStructs(*I, StructPrinted);
1778 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1779 // Check to see if we have already printed this struct.
1780 if (StructPrinted.insert(STy).second) {
1781 // Print structure type out.
1782 std::string Name = TypeNames[STy];
1783 printType(Out, STy, false, Name, true);
1789 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1790 /// isStructReturn - Should this function actually return a struct by-value?
1791 bool isStructReturn = F->getFunctionType()->isStructReturn();
1793 if (F->hasInternalLinkage()) Out << "static ";
1794 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1795 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1796 switch (F->getCallingConv()) {
1797 case CallingConv::X86_StdCall:
1798 Out << "__stdcall ";
1800 case CallingConv::X86_FastCall:
1801 Out << "__fastcall ";
1805 // Loop over the arguments, printing them...
1806 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1807 const ParamAttrsList *Attrs = FT->getParamAttrs();
1809 std::stringstream FunctionInnards;
1811 // Print out the name...
1812 FunctionInnards << GetValueName(F) << '(';
1814 bool PrintedArg = false;
1815 if (!F->isDeclaration()) {
1816 if (!F->arg_empty()) {
1817 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1819 // If this is a struct-return function, don't print the hidden
1820 // struct-return argument.
1821 if (isStructReturn) {
1822 assert(I != E && "Invalid struct return function!");
1826 std::string ArgName;
1828 for (; I != E; ++I) {
1829 if (PrintedArg) FunctionInnards << ", ";
1830 if (I->hasName() || !Prototype)
1831 ArgName = GetValueName(I);
1834 printType(FunctionInnards, I->getType(),
1835 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt),
1842 // Loop over the arguments, printing them.
1843 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1845 // If this is a struct-return function, don't print the hidden
1846 // struct-return argument.
1847 if (isStructReturn) {
1848 assert(I != E && "Invalid struct return function!");
1853 for (; I != E; ++I) {
1854 if (PrintedArg) FunctionInnards << ", ";
1855 printType(FunctionInnards, *I,
1856 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt));
1862 // Finish printing arguments... if this is a vararg function, print the ...,
1863 // unless there are no known types, in which case, we just emit ().
1865 if (FT->isVarArg() && PrintedArg) {
1866 if (PrintedArg) FunctionInnards << ", ";
1867 FunctionInnards << "..."; // Output varargs portion of signature!
1868 } else if (!FT->isVarArg() && !PrintedArg) {
1869 FunctionInnards << "void"; // ret() -> ret(void) in C.
1871 FunctionInnards << ')';
1873 // Get the return tpe for the function.
1875 if (!isStructReturn)
1876 RetTy = F->getReturnType();
1878 // If this is a struct-return function, print the struct-return type.
1879 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1882 // Print out the return type and the signature built above.
1883 printType(Out, RetTy,
1884 /*isSigned=*/ Attrs && Attrs->paramHasAttr(0, ParamAttr::SExt),
1885 FunctionInnards.str());
1888 static inline bool isFPIntBitCast(const Instruction &I) {
1889 if (!isa<BitCastInst>(I))
1891 const Type *SrcTy = I.getOperand(0)->getType();
1892 const Type *DstTy = I.getType();
1893 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1894 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1897 void CWriter::printFunction(Function &F) {
1898 /// isStructReturn - Should this function actually return a struct by-value?
1899 bool isStructReturn = F.getFunctionType()->isStructReturn();
1901 printFunctionSignature(&F, false);
1904 // If this is a struct return function, handle the result with magic.
1905 if (isStructReturn) {
1906 const Type *StructTy =
1907 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1909 printType(Out, StructTy, false, "StructReturn");
1910 Out << "; /* Struct return temporary */\n";
1913 printType(Out, F.arg_begin()->getType(), false,
1914 GetValueName(F.arg_begin()));
1915 Out << " = &StructReturn;\n";
1918 bool PrintedVar = false;
1920 // print local variable information for the function
1921 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1922 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1924 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
1925 Out << "; /* Address-exposed local */\n";
1927 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1929 printType(Out, I->getType(), false, GetValueName(&*I));
1932 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1934 printType(Out, I->getType(), false,
1935 GetValueName(&*I)+"__PHI_TEMPORARY");
1940 // We need a temporary for the BitCast to use so it can pluck a value out
1941 // of a union to do the BitCast. This is separate from the need for a
1942 // variable to hold the result of the BitCast.
1943 if (isFPIntBitCast(*I)) {
1944 Out << " llvmBitCastUnion " << GetValueName(&*I)
1945 << "__BITCAST_TEMPORARY;\n";
1953 if (F.hasExternalLinkage() && F.getName() == "main")
1954 Out << " CODE_FOR_MAIN();\n";
1956 // print the basic blocks
1957 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1958 if (Loop *L = LI->getLoopFor(BB)) {
1959 if (L->getHeader() == BB && L->getParentLoop() == 0)
1962 printBasicBlock(BB);
1969 void CWriter::printLoop(Loop *L) {
1970 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1971 << "' to make GCC happy */\n";
1972 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1973 BasicBlock *BB = L->getBlocks()[i];
1974 Loop *BBLoop = LI->getLoopFor(BB);
1976 printBasicBlock(BB);
1977 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
1980 Out << " } while (1); /* end of syntactic loop '"
1981 << L->getHeader()->getName() << "' */\n";
1984 void CWriter::printBasicBlock(BasicBlock *BB) {
1986 // Don't print the label for the basic block if there are no uses, or if
1987 // the only terminator use is the predecessor basic block's terminator.
1988 // We have to scan the use list because PHI nodes use basic blocks too but
1989 // do not require a label to be generated.
1991 bool NeedsLabel = false;
1992 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
1993 if (isGotoCodeNecessary(*PI, BB)) {
1998 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2000 // Output all of the instructions in the basic block...
2001 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2003 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2004 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
2013 // Don't emit prefix or suffix for the terminator...
2014 visit(*BB->getTerminator());
2018 // Specific Instruction type classes... note that all of the casts are
2019 // necessary because we use the instruction classes as opaque types...
2021 void CWriter::visitReturnInst(ReturnInst &I) {
2022 // If this is a struct return function, return the temporary struct.
2023 bool isStructReturn = I.getParent()->getParent()->
2024 getFunctionType()->isStructReturn();
2026 if (isStructReturn) {
2027 Out << " return StructReturn;\n";
2031 // Don't output a void return if this is the last basic block in the function
2032 if (I.getNumOperands() == 0 &&
2033 &*--I.getParent()->getParent()->end() == I.getParent() &&
2034 !I.getParent()->size() == 1) {
2039 if (I.getNumOperands()) {
2041 writeOperand(I.getOperand(0));
2046 void CWriter::visitSwitchInst(SwitchInst &SI) {
2049 writeOperand(SI.getOperand(0));
2050 Out << ") {\n default:\n";
2051 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2052 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2054 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2056 writeOperand(SI.getOperand(i));
2058 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2059 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2060 printBranchToBlock(SI.getParent(), Succ, 2);
2061 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
2067 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2068 Out << " /*UNREACHABLE*/;\n";
2071 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2072 /// FIXME: This should be reenabled, but loop reordering safe!!
2075 if (next(Function::iterator(From)) != Function::iterator(To))
2076 return true; // Not the direct successor, we need a goto.
2078 //isa<SwitchInst>(From->getTerminator())
2080 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2085 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2086 BasicBlock *Successor,
2088 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2089 PHINode *PN = cast<PHINode>(I);
2090 // Now we have to do the printing.
2091 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2092 if (!isa<UndefValue>(IV)) {
2093 Out << std::string(Indent, ' ');
2094 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2096 Out << "; /* for PHI node */\n";
2101 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2103 if (isGotoCodeNecessary(CurBB, Succ)) {
2104 Out << std::string(Indent, ' ') << " goto ";
2110 // Branch instruction printing - Avoid printing out a branch to a basic block
2111 // that immediately succeeds the current one.
2113 void CWriter::visitBranchInst(BranchInst &I) {
2115 if (I.isConditional()) {
2116 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2118 writeOperand(I.getCondition());
2121 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2122 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2124 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2125 Out << " } else {\n";
2126 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2127 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2130 // First goto not necessary, assume second one is...
2132 writeOperand(I.getCondition());
2135 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2136 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2141 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2142 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2147 // PHI nodes get copied into temporary values at the end of predecessor basic
2148 // blocks. We now need to copy these temporary values into the REAL value for
2150 void CWriter::visitPHINode(PHINode &I) {
2152 Out << "__PHI_TEMPORARY";
2156 void CWriter::visitBinaryOperator(Instruction &I) {
2157 // binary instructions, shift instructions, setCond instructions.
2158 assert(!isa<PointerType>(I.getType()));
2160 // We must cast the results of binary operations which might be promoted.
2161 bool needsCast = false;
2162 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2163 || (I.getType() == Type::FloatTy)) {
2166 printType(Out, I.getType(), false);
2170 // If this is a negation operation, print it out as such. For FP, we don't
2171 // want to print "-0.0 - X".
2172 if (BinaryOperator::isNeg(&I)) {
2174 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2176 } else if (I.getOpcode() == Instruction::FRem) {
2177 // Output a call to fmod/fmodf instead of emitting a%b
2178 if (I.getType() == Type::FloatTy)
2182 writeOperand(I.getOperand(0));
2184 writeOperand(I.getOperand(1));
2188 // Write out the cast of the instruction's value back to the proper type
2190 bool NeedsClosingParens = writeInstructionCast(I);
2192 // Certain instructions require the operand to be forced to a specific type
2193 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2194 // below for operand 1
2195 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2197 switch (I.getOpcode()) {
2198 case Instruction::Add: Out << " + "; break;
2199 case Instruction::Sub: Out << " - "; break;
2200 case Instruction::Mul: Out << " * "; break;
2201 case Instruction::URem:
2202 case Instruction::SRem:
2203 case Instruction::FRem: Out << " % "; break;
2204 case Instruction::UDiv:
2205 case Instruction::SDiv:
2206 case Instruction::FDiv: Out << " / "; break;
2207 case Instruction::And: Out << " & "; break;
2208 case Instruction::Or: Out << " | "; break;
2209 case Instruction::Xor: Out << " ^ "; break;
2210 case Instruction::Shl : Out << " << "; break;
2211 case Instruction::LShr:
2212 case Instruction::AShr: Out << " >> "; break;
2213 default: cerr << "Invalid operator type!" << I; abort();
2216 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2217 if (NeedsClosingParens)
2226 void CWriter::visitICmpInst(ICmpInst &I) {
2227 // We must cast the results of icmp which might be promoted.
2228 bool needsCast = false;
2230 // Write out the cast of the instruction's value back to the proper type
2232 bool NeedsClosingParens = writeInstructionCast(I);
2234 // Certain icmp predicate require the operand to be forced to a specific type
2235 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2236 // below for operand 1
2237 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2239 switch (I.getPredicate()) {
2240 case ICmpInst::ICMP_EQ: Out << " == "; break;
2241 case ICmpInst::ICMP_NE: Out << " != "; break;
2242 case ICmpInst::ICMP_ULE:
2243 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2244 case ICmpInst::ICMP_UGE:
2245 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2246 case ICmpInst::ICMP_ULT:
2247 case ICmpInst::ICMP_SLT: Out << " < "; break;
2248 case ICmpInst::ICMP_UGT:
2249 case ICmpInst::ICMP_SGT: Out << " > "; break;
2250 default: cerr << "Invalid icmp predicate!" << I; abort();
2253 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2254 if (NeedsClosingParens)
2262 void CWriter::visitFCmpInst(FCmpInst &I) {
2263 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2267 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2273 switch (I.getPredicate()) {
2274 default: assert(0 && "Illegal FCmp predicate");
2275 case FCmpInst::FCMP_ORD: op = "ord"; break;
2276 case FCmpInst::FCMP_UNO: op = "uno"; break;
2277 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2278 case FCmpInst::FCMP_UNE: op = "une"; break;
2279 case FCmpInst::FCMP_ULT: op = "ult"; break;
2280 case FCmpInst::FCMP_ULE: op = "ule"; break;
2281 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2282 case FCmpInst::FCMP_UGE: op = "uge"; break;
2283 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2284 case FCmpInst::FCMP_ONE: op = "one"; break;
2285 case FCmpInst::FCMP_OLT: op = "olt"; break;
2286 case FCmpInst::FCMP_OLE: op = "ole"; break;
2287 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2288 case FCmpInst::FCMP_OGE: op = "oge"; break;
2291 Out << "llvm_fcmp_" << op << "(";
2292 // Write the first operand
2293 writeOperand(I.getOperand(0));
2295 // Write the second operand
2296 writeOperand(I.getOperand(1));
2300 static const char * getFloatBitCastField(const Type *Ty) {
2301 switch (Ty->getTypeID()) {
2302 default: assert(0 && "Invalid Type");
2303 case Type::FloatTyID: return "Float";
2304 case Type::DoubleTyID: return "Double";
2305 case Type::IntegerTyID: {
2306 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2315 void CWriter::visitCastInst(CastInst &I) {
2316 const Type *DstTy = I.getType();
2317 const Type *SrcTy = I.getOperand(0)->getType();
2319 if (isFPIntBitCast(I)) {
2320 // These int<->float and long<->double casts need to be handled specially
2321 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2322 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2323 writeOperand(I.getOperand(0));
2324 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2325 << getFloatBitCastField(I.getType());
2327 printCast(I.getOpcode(), SrcTy, DstTy);
2328 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::Int1Ty) {
2329 // Make sure we really get a sext from bool by subtracing the bool from 0
2332 writeOperand(I.getOperand(0));
2333 if (DstTy == Type::Int1Ty &&
2334 (I.getOpcode() == Instruction::Trunc ||
2335 I.getOpcode() == Instruction::FPToUI ||
2336 I.getOpcode() == Instruction::FPToSI ||
2337 I.getOpcode() == Instruction::PtrToInt)) {
2338 // Make sure we really get a trunc to bool by anding the operand with 1
2345 void CWriter::visitSelectInst(SelectInst &I) {
2347 writeOperand(I.getCondition());
2349 writeOperand(I.getTrueValue());
2351 writeOperand(I.getFalseValue());
2356 void CWriter::lowerIntrinsics(Function &F) {
2357 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2358 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2359 if (CallInst *CI = dyn_cast<CallInst>(I++))
2360 if (Function *F = CI->getCalledFunction())
2361 switch (F->getIntrinsicID()) {
2362 case Intrinsic::not_intrinsic:
2363 case Intrinsic::vastart:
2364 case Intrinsic::vacopy:
2365 case Intrinsic::vaend:
2366 case Intrinsic::returnaddress:
2367 case Intrinsic::frameaddress:
2368 case Intrinsic::setjmp:
2369 case Intrinsic::longjmp:
2370 case Intrinsic::prefetch:
2371 case Intrinsic::dbg_stoppoint:
2372 case Intrinsic::powi_f32:
2373 case Intrinsic::powi_f64:
2374 // We directly implement these intrinsics
2377 // If this is an intrinsic that directly corresponds to a GCC
2378 // builtin, we handle it.
2379 const char *BuiltinName = "";
2380 #define GET_GCC_BUILTIN_NAME
2381 #include "llvm/Intrinsics.gen"
2382 #undef GET_GCC_BUILTIN_NAME
2383 // If we handle it, don't lower it.
2384 if (BuiltinName[0]) break;
2386 // All other intrinsic calls we must lower.
2387 Instruction *Before = 0;
2388 if (CI != &BB->front())
2389 Before = prior(BasicBlock::iterator(CI));
2391 IL->LowerIntrinsicCall(CI);
2392 if (Before) { // Move iterator to instruction after call
2403 void CWriter::visitCallInst(CallInst &I) {
2404 //check if we have inline asm
2405 if (isInlineAsm(I)) {
2410 bool WroteCallee = false;
2412 // Handle intrinsic function calls first...
2413 if (Function *F = I.getCalledFunction())
2414 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2417 // If this is an intrinsic that directly corresponds to a GCC
2418 // builtin, we emit it here.
2419 const char *BuiltinName = "";
2420 #define GET_GCC_BUILTIN_NAME
2421 #include "llvm/Intrinsics.gen"
2422 #undef GET_GCC_BUILTIN_NAME
2423 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2429 case Intrinsic::vastart:
2432 Out << "va_start(*(va_list*)";
2433 writeOperand(I.getOperand(1));
2435 // Output the last argument to the enclosing function...
2436 if (I.getParent()->getParent()->arg_empty()) {
2437 cerr << "The C backend does not currently support zero "
2438 << "argument varargs functions, such as '"
2439 << I.getParent()->getParent()->getName() << "'!\n";
2442 writeOperand(--I.getParent()->getParent()->arg_end());
2445 case Intrinsic::vaend:
2446 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2447 Out << "0; va_end(*(va_list*)";
2448 writeOperand(I.getOperand(1));
2451 Out << "va_end(*(va_list*)0)";
2454 case Intrinsic::vacopy:
2456 Out << "va_copy(*(va_list*)";
2457 writeOperand(I.getOperand(1));
2458 Out << ", *(va_list*)";
2459 writeOperand(I.getOperand(2));
2462 case Intrinsic::returnaddress:
2463 Out << "__builtin_return_address(";
2464 writeOperand(I.getOperand(1));
2467 case Intrinsic::frameaddress:
2468 Out << "__builtin_frame_address(";
2469 writeOperand(I.getOperand(1));
2472 case Intrinsic::powi_f32:
2473 case Intrinsic::powi_f64:
2474 Out << "__builtin_powi(";
2475 writeOperand(I.getOperand(1));
2477 writeOperand(I.getOperand(2));
2480 case Intrinsic::setjmp:
2481 Out << "setjmp(*(jmp_buf*)";
2482 writeOperand(I.getOperand(1));
2485 case Intrinsic::longjmp:
2486 Out << "longjmp(*(jmp_buf*)";
2487 writeOperand(I.getOperand(1));
2489 writeOperand(I.getOperand(2));
2492 case Intrinsic::prefetch:
2493 Out << "LLVM_PREFETCH((const void *)";
2494 writeOperand(I.getOperand(1));
2496 writeOperand(I.getOperand(2));
2498 writeOperand(I.getOperand(3));
2501 case Intrinsic::dbg_stoppoint: {
2502 // If we use writeOperand directly we get a "u" suffix which is rejected
2504 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2508 << " \"" << SPI.getDirectory()
2509 << SPI.getFileName() << "\"\n";
2515 Value *Callee = I.getCalledValue();
2517 const PointerType *PTy = cast<PointerType>(Callee->getType());
2518 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2520 // If this is a call to a struct-return function, assign to the first
2521 // parameter instead of passing it to the call.
2522 bool isStructRet = FTy->isStructReturn();
2525 writeOperand(I.getOperand(1));
2529 if (I.isTailCall()) Out << " /*tail*/ ";
2532 // If this is an indirect call to a struct return function, we need to cast
2534 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2536 // GCC is a real PITA. It does not permit codegening casts of functions to
2537 // function pointers if they are in a call (it generates a trap instruction
2538 // instead!). We work around this by inserting a cast to void* in between
2539 // the function and the function pointer cast. Unfortunately, we can't just
2540 // form the constant expression here, because the folder will immediately
2543 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2544 // that void* and function pointers have the same size. :( To deal with this
2545 // in the common case, we handle casts where the number of arguments passed
2548 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2550 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2556 // Ok, just cast the pointer type.
2559 printType(Out, I.getCalledValue()->getType());
2561 printStructReturnPointerFunctionType(Out,
2562 cast<PointerType>(I.getCalledValue()->getType()));
2565 writeOperand(Callee);
2566 if (NeedsCast) Out << ')';
2571 unsigned NumDeclaredParams = FTy->getNumParams();
2573 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2575 if (isStructRet) { // Skip struct return argument.
2580 const ParamAttrsList *Attrs = FTy->getParamAttrs();
2581 bool PrintedArg = false;
2583 for (; AI != AE; ++AI, ++ArgNo, ++Idx) {
2584 if (PrintedArg) Out << ", ";
2585 if (ArgNo < NumDeclaredParams &&
2586 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2588 printType(Out, FTy->getParamType(ArgNo),
2589 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt));
2599 //This converts the llvm constraint string to something gcc is expecting.
2600 //TODO: work out platform independent constraints and factor those out
2601 // of the per target tables
2602 // handle multiple constraint codes
2603 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2605 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2607 const char** table = 0;
2609 //Grab the translation table from TargetAsmInfo if it exists
2612 const TargetMachineRegistry::Entry* Match =
2613 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2615 //Per platform Target Machines don't exist, so create it
2616 // this must be done only once
2617 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2618 TAsm = TM->getTargetAsmInfo();
2622 table = TAsm->getAsmCBE();
2624 //Search the translation table if it exists
2625 for (int i = 0; table && table[i]; i += 2)
2626 if (c.Codes[0] == table[i])
2629 //default is identity
2633 //TODO: import logic from AsmPrinter.cpp
2634 static std::string gccifyAsm(std::string asmstr) {
2635 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2636 if (asmstr[i] == '\n')
2637 asmstr.replace(i, 1, "\\n");
2638 else if (asmstr[i] == '\t')
2639 asmstr.replace(i, 1, "\\t");
2640 else if (asmstr[i] == '$') {
2641 if (asmstr[i + 1] == '{') {
2642 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2643 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2644 std::string n = "%" +
2645 asmstr.substr(a + 1, b - a - 1) +
2646 asmstr.substr(i + 2, a - i - 2);
2647 asmstr.replace(i, b - i + 1, n);
2650 asmstr.replace(i, 1, "%");
2652 else if (asmstr[i] == '%')//grr
2653 { asmstr.replace(i, 1, "%%"); ++i;}
2658 //TODO: assumptions about what consume arguments from the call are likely wrong
2659 // handle communitivity
2660 void CWriter::visitInlineAsm(CallInst &CI) {
2661 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2662 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2663 std::vector<std::pair<std::string, Value*> > Input;
2664 std::vector<std::pair<std::string, Value*> > Output;
2665 std::string Clobber;
2666 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2667 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2668 E = Constraints.end(); I != E; ++I) {
2669 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2671 InterpretASMConstraint(*I);
2674 assert(0 && "Unknown asm constraint");
2676 case InlineAsm::isInput: {
2678 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2679 ++count; //consume arg
2683 case InlineAsm::isOutput: {
2685 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2686 count ? CI.getOperand(count) : &CI));
2687 ++count; //consume arg
2691 case InlineAsm::isClobber: {
2693 Clobber += ",\"" + c + "\"";
2699 //fix up the asm string for gcc
2700 std::string asmstr = gccifyAsm(as->getAsmString());
2702 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2704 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2705 E = Output.end(); I != E; ++I) {
2706 Out << "\"" << I->first << "\"(";
2707 writeOperandRaw(I->second);
2713 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2714 E = Input.end(); I != E; ++I) {
2715 Out << "\"" << I->first << "\"(";
2716 writeOperandRaw(I->second);
2722 Out << "\n :" << Clobber.substr(1);
2726 void CWriter::visitMallocInst(MallocInst &I) {
2727 assert(0 && "lowerallocations pass didn't work!");
2730 void CWriter::visitAllocaInst(AllocaInst &I) {
2732 printType(Out, I.getType());
2733 Out << ") alloca(sizeof(";
2734 printType(Out, I.getType()->getElementType());
2736 if (I.isArrayAllocation()) {
2738 writeOperand(I.getOperand(0));
2743 void CWriter::visitFreeInst(FreeInst &I) {
2744 assert(0 && "lowerallocations pass didn't work!");
2747 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2748 gep_type_iterator E) {
2749 bool HasImplicitAddress = false;
2750 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2751 if (isa<GlobalValue>(Ptr)) {
2752 HasImplicitAddress = true;
2753 } else if (isDirectAlloca(Ptr)) {
2754 HasImplicitAddress = true;
2758 if (!HasImplicitAddress)
2759 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2761 writeOperandInternal(Ptr);
2765 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2766 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2769 writeOperandInternal(Ptr);
2771 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2773 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2776 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2777 "Can only have implicit address with direct accessing");
2779 if (HasImplicitAddress) {
2781 } else if (CI && CI->isNullValue()) {
2782 gep_type_iterator TmpI = I; ++TmpI;
2784 // Print out the -> operator if possible...
2785 if (TmpI != E && isa<StructType>(*TmpI)) {
2786 Out << (HasImplicitAddress ? "." : "->");
2787 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2793 if (isa<StructType>(*I)) {
2794 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2797 writeOperand(I.getOperand());
2802 void CWriter::visitLoadInst(LoadInst &I) {
2804 if (I.isVolatile()) {
2806 printType(Out, I.getType(), false, "volatile*");
2810 writeOperand(I.getOperand(0));
2816 void CWriter::visitStoreInst(StoreInst &I) {
2818 if (I.isVolatile()) {
2820 printType(Out, I.getOperand(0)->getType(), false, " volatile*");
2823 writeOperand(I.getPointerOperand());
2824 if (I.isVolatile()) Out << ')';
2826 Value *Operand = I.getOperand(0);
2827 Constant *BitMask = 0;
2828 if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
2829 if (!ITy->isPowerOf2ByteWidth())
2830 // We have a bit width that doesn't match an even power-of-2 byte
2831 // size. Consequently we must & the value with the type's bit mask
2832 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
2835 writeOperand(Operand);
2838 printConstant(BitMask);
2843 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2845 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2849 void CWriter::visitVAArgInst(VAArgInst &I) {
2850 Out << "va_arg(*(va_list*)";
2851 writeOperand(I.getOperand(0));
2853 printType(Out, I.getType());
2857 //===----------------------------------------------------------------------===//
2858 // External Interface declaration
2859 //===----------------------------------------------------------------------===//
2861 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2863 CodeGenFileType FileType,
2865 if (FileType != TargetMachine::AssemblyFile) return true;
2867 PM.add(createLowerGCPass());
2868 PM.add(createLowerAllocationsPass(true));
2869 PM.add(createLowerInvokePass());
2870 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2871 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2872 PM.add(new CWriter(o));