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 {
61 CBackendNameAllUsedStructsAndMergeFunctions()
62 : ModulePass((intptr_t)&ID) {}
63 void getAnalysisUsage(AnalysisUsage &AU) const {
64 AU.addRequired<FindUsedTypes>();
67 virtual const char *getPassName() const {
68 return "C backend type canonicalizer";
71 virtual bool runOnModule(Module &M);
74 char CBackendNameAllUsedStructsAndMergeFunctions::ID = 0;
76 /// CWriter - This class is the main chunk of code that converts an LLVM
77 /// module to a C translation unit.
78 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
80 IntrinsicLowering *IL;
83 const Module *TheModule;
84 const TargetAsmInfo* TAsm;
86 std::map<const Type *, std::string> TypeNames;
87 std::map<const ConstantFP *, unsigned> FPConstantMap;
88 std::set<Function*> intrinsicPrototypesAlreadyGenerated;
92 CWriter(std::ostream &o)
93 : FunctionPass((intptr_t)&ID), Out(o), IL(0), Mang(0), LI(0),
94 TheModule(0), TAsm(0), TD(0) {}
96 virtual const char *getPassName() const { return "C backend"; }
98 void getAnalysisUsage(AnalysisUsage &AU) const {
99 AU.addRequired<LoopInfo>();
100 AU.setPreservesAll();
103 virtual bool doInitialization(Module &M);
105 bool runOnFunction(Function &F) {
106 LI = &getAnalysis<LoopInfo>();
108 // Get rid of intrinsics we can't handle.
111 // Output all floating point constants that cannot be printed accurately.
112 printFloatingPointConstants(F);
115 FPConstantMap.clear();
119 virtual bool doFinalization(Module &M) {
126 std::ostream &printType(std::ostream &Out, const Type *Ty,
127 bool isSigned = false,
128 const std::string &VariableName = "",
129 bool IgnoreName = false);
130 std::ostream &printSimpleType(std::ostream &Out, const Type *Ty,
132 const std::string &NameSoFar = "");
134 void printStructReturnPointerFunctionType(std::ostream &Out,
135 const PointerType *Ty);
137 void writeOperand(Value *Operand);
138 void writeOperandRaw(Value *Operand);
139 void writeOperandInternal(Value *Operand);
140 void writeOperandWithCast(Value* Operand, unsigned Opcode);
141 void writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate);
142 bool writeInstructionCast(const Instruction &I);
145 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
147 void lowerIntrinsics(Function &F);
149 void printModule(Module *M);
150 void printModuleTypes(const TypeSymbolTable &ST);
151 void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
152 void printFloatingPointConstants(Function &F);
153 void printFunctionSignature(const Function *F, bool Prototype);
155 void printFunction(Function &);
156 void printBasicBlock(BasicBlock *BB);
157 void printLoop(Loop *L);
159 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
160 void printConstant(Constant *CPV);
161 void printConstantWithCast(Constant *CPV, unsigned Opcode);
162 bool printConstExprCast(const ConstantExpr *CE);
163 void printConstantArray(ConstantArray *CPA);
164 void printConstantVector(ConstantVector *CP);
166 // isInlinableInst - Attempt to inline instructions into their uses to build
167 // trees as much as possible. To do this, we have to consistently decide
168 // what is acceptable to inline, so that variable declarations don't get
169 // printed and an extra copy of the expr is not emitted.
171 static bool isInlinableInst(const Instruction &I) {
172 // Always inline cmp instructions, even if they are shared by multiple
173 // expressions. GCC generates horrible code if we don't.
177 // Must be an expression, must be used exactly once. If it is dead, we
178 // emit it inline where it would go.
179 if (I.getType() == Type::VoidTy || !I.hasOneUse() ||
180 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
181 isa<LoadInst>(I) || isa<VAArgInst>(I))
182 // Don't inline a load across a store or other bad things!
185 // Must not be used in inline asm
186 if (I.hasOneUse() && isInlineAsm(*I.use_back())) return false;
188 // Only inline instruction it if it's use is in the same BB as the inst.
189 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
192 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
193 // variables which are accessed with the & operator. This causes GCC to
194 // generate significantly better code than to emit alloca calls directly.
196 static const AllocaInst *isDirectAlloca(const Value *V) {
197 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
198 if (!AI) return false;
199 if (AI->isArrayAllocation())
200 return 0; // FIXME: we can also inline fixed size array allocas!
201 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
206 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
207 static bool isInlineAsm(const Instruction& I) {
208 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
213 // Instruction visitation functions
214 friend class InstVisitor<CWriter>;
216 void visitReturnInst(ReturnInst &I);
217 void visitBranchInst(BranchInst &I);
218 void visitSwitchInst(SwitchInst &I);
219 void visitInvokeInst(InvokeInst &I) {
220 assert(0 && "Lowerinvoke pass didn't work!");
223 void visitUnwindInst(UnwindInst &I) {
224 assert(0 && "Lowerinvoke pass didn't work!");
226 void visitUnreachableInst(UnreachableInst &I);
228 void visitPHINode(PHINode &I);
229 void visitBinaryOperator(Instruction &I);
230 void visitICmpInst(ICmpInst &I);
231 void visitFCmpInst(FCmpInst &I);
233 void visitCastInst (CastInst &I);
234 void visitSelectInst(SelectInst &I);
235 void visitCallInst (CallInst &I);
236 void visitInlineAsm(CallInst &I);
238 void visitMallocInst(MallocInst &I);
239 void visitAllocaInst(AllocaInst &I);
240 void visitFreeInst (FreeInst &I);
241 void visitLoadInst (LoadInst &I);
242 void visitStoreInst (StoreInst &I);
243 void visitGetElementPtrInst(GetElementPtrInst &I);
244 void visitVAArgInst (VAArgInst &I);
246 void visitInstruction(Instruction &I) {
247 cerr << "C Writer does not know about " << I;
251 void outputLValue(Instruction *I) {
252 Out << " " << GetValueName(I) << " = ";
255 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
256 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
257 BasicBlock *Successor, unsigned Indent);
258 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
260 void printIndexingExpression(Value *Ptr, gep_type_iterator I,
261 gep_type_iterator E);
263 std::string GetValueName(const Value *Operand);
267 char CWriter::ID = 0;
269 /// This method inserts names for any unnamed structure types that are used by
270 /// the program, and removes names from structure types that are not used by the
273 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
274 // Get a set of types that are used by the program...
275 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
277 // Loop over the module symbol table, removing types from UT that are
278 // already named, and removing names for types that are not used.
280 TypeSymbolTable &TST = M.getTypeSymbolTable();
281 for (TypeSymbolTable::iterator TI = TST.begin(), TE = TST.end();
283 TypeSymbolTable::iterator I = TI++;
285 // If this isn't a struct type, remove it from our set of types to name.
286 // This simplifies emission later.
287 if (!isa<StructType>(I->second) && !isa<OpaqueType>(I->second)) {
290 // If this is not used, remove it from the symbol table.
291 std::set<const Type *>::iterator UTI = UT.find(I->second);
295 UT.erase(UTI); // Only keep one name for this type.
299 // UT now contains types that are not named. Loop over it, naming
302 bool Changed = false;
303 unsigned RenameCounter = 0;
304 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
306 if (const StructType *ST = dyn_cast<StructType>(*I)) {
307 while (M.addTypeName("unnamed"+utostr(RenameCounter), ST))
313 // Loop over all external functions and globals. If we have two with
314 // identical names, merge them.
315 // FIXME: This code should disappear when we don't allow values with the same
316 // names when they have different types!
317 std::map<std::string, GlobalValue*> ExtSymbols;
318 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
320 if (GV->isDeclaration() && GV->hasName()) {
321 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
322 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
324 // Found a conflict, replace this global with the previous one.
325 GlobalValue *OldGV = X.first->second;
326 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
327 GV->eraseFromParent();
332 // Do the same for globals.
333 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
335 GlobalVariable *GV = I++;
336 if (GV->isDeclaration() && GV->hasName()) {
337 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
338 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
340 // Found a conflict, replace this global with the previous one.
341 GlobalValue *OldGV = X.first->second;
342 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
343 GV->eraseFromParent();
352 /// printStructReturnPointerFunctionType - This is like printType for a struct
353 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
354 /// print it as "Struct (*)(...)", for struct return functions.
355 void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
356 const PointerType *TheTy) {
357 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
358 std::stringstream FunctionInnards;
359 FunctionInnards << " (*) (";
360 bool PrintedType = false;
362 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
363 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
365 const ParamAttrsList *Attrs = FTy->getParamAttrs();
366 for (++I; I != E; ++I) {
368 FunctionInnards << ", ";
369 printType(FunctionInnards, *I,
370 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt), "");
373 if (FTy->isVarArg()) {
375 FunctionInnards << ", ...";
376 } else if (!PrintedType) {
377 FunctionInnards << "void";
379 FunctionInnards << ')';
380 std::string tstr = FunctionInnards.str();
381 printType(Out, RetTy,
382 /*isSigned=*/Attrs && Attrs->paramHasAttr(0, ParamAttr::SExt), tstr);
386 CWriter::printSimpleType(std::ostream &Out, const Type *Ty, bool isSigned,
387 const std::string &NameSoFar) {
388 assert((Ty->isPrimitiveType() || Ty->isInteger()) &&
389 "Invalid type for printSimpleType");
390 switch (Ty->getTypeID()) {
391 case Type::VoidTyID: return Out << "void " << NameSoFar;
392 case Type::IntegerTyID: {
393 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
395 return Out << "bool " << NameSoFar;
396 else if (NumBits <= 8)
397 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
398 else if (NumBits <= 16)
399 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
400 else if (NumBits <= 32)
401 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
403 assert(NumBits <= 64 && "Bit widths > 64 not implemented yet");
404 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
407 case Type::FloatTyID: return Out << "float " << NameSoFar;
408 case Type::DoubleTyID: return Out << "double " << NameSoFar;
410 cerr << "Unknown primitive type: " << *Ty << "\n";
415 // Pass the Type* and the variable name and this prints out the variable
418 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
419 bool isSigned, const std::string &NameSoFar,
421 if (Ty->isPrimitiveType() || Ty->isInteger()) {
422 printSimpleType(Out, Ty, isSigned, NameSoFar);
426 // Check to see if the type is named.
427 if (!IgnoreName || isa<OpaqueType>(Ty)) {
428 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
429 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
432 switch (Ty->getTypeID()) {
433 case Type::FunctionTyID: {
434 const FunctionType *FTy = cast<FunctionType>(Ty);
435 std::stringstream FunctionInnards;
436 FunctionInnards << " (" << NameSoFar << ") (";
437 const ParamAttrsList *Attrs = FTy->getParamAttrs();
439 for (FunctionType::param_iterator I = FTy->param_begin(),
440 E = FTy->param_end(); I != E; ++I) {
441 if (I != FTy->param_begin())
442 FunctionInnards << ", ";
443 printType(FunctionInnards, *I,
444 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt), "");
447 if (FTy->isVarArg()) {
448 if (FTy->getNumParams())
449 FunctionInnards << ", ...";
450 } else if (!FTy->getNumParams()) {
451 FunctionInnards << "void";
453 FunctionInnards << ')';
454 std::string tstr = FunctionInnards.str();
455 printType(Out, FTy->getReturnType(),
456 /*isSigned=*/Attrs && Attrs->paramHasAttr(0, ParamAttr::SExt), tstr);
459 case Type::StructTyID: {
460 const StructType *STy = cast<StructType>(Ty);
461 Out << NameSoFar + " {\n";
463 for (StructType::element_iterator I = STy->element_begin(),
464 E = STy->element_end(); I != E; ++I) {
466 printType(Out, *I, false, "field" + utostr(Idx++));
471 Out << " __attribute__ ((packed))";
475 case Type::PointerTyID: {
476 const PointerType *PTy = cast<PointerType>(Ty);
477 std::string ptrName = "*" + NameSoFar;
479 if (isa<ArrayType>(PTy->getElementType()) ||
480 isa<VectorType>(PTy->getElementType()))
481 ptrName = "(" + ptrName + ")";
483 return printType(Out, PTy->getElementType(), false, ptrName);
486 case Type::ArrayTyID: {
487 const ArrayType *ATy = cast<ArrayType>(Ty);
488 unsigned NumElements = ATy->getNumElements();
489 if (NumElements == 0) NumElements = 1;
490 return printType(Out, ATy->getElementType(), false,
491 NameSoFar + "[" + utostr(NumElements) + "]");
494 case Type::VectorTyID: {
495 const VectorType *PTy = cast<VectorType>(Ty);
496 unsigned NumElements = PTy->getNumElements();
497 if (NumElements == 0) NumElements = 1;
498 return printType(Out, PTy->getElementType(), false,
499 NameSoFar + "[" + utostr(NumElements) + "]");
502 case Type::OpaqueTyID: {
503 static int Count = 0;
504 std::string TyName = "struct opaque_" + itostr(Count++);
505 assert(TypeNames.find(Ty) == TypeNames.end());
506 TypeNames[Ty] = TyName;
507 return Out << TyName << ' ' << NameSoFar;
510 assert(0 && "Unhandled case in getTypeProps!");
517 void CWriter::printConstantArray(ConstantArray *CPA) {
519 // As a special case, print the array as a string if it is an array of
520 // ubytes or an array of sbytes with positive values.
522 const Type *ETy = CPA->getType()->getElementType();
523 bool isString = (ETy == Type::Int8Ty || ETy == Type::Int8Ty);
525 // Make sure the last character is a null char, as automatically added by C
526 if (isString && (CPA->getNumOperands() == 0 ||
527 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
532 // Keep track of whether the last number was a hexadecimal escape
533 bool LastWasHex = false;
535 // Do not include the last character, which we know is null
536 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
537 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
539 // Print it out literally if it is a printable character. The only thing
540 // to be careful about is when the last letter output was a hex escape
541 // code, in which case we have to be careful not to print out hex digits
542 // explicitly (the C compiler thinks it is a continuation of the previous
543 // character, sheesh...)
545 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
547 if (C == '"' || C == '\\')
554 case '\n': Out << "\\n"; break;
555 case '\t': Out << "\\t"; break;
556 case '\r': Out << "\\r"; break;
557 case '\v': Out << "\\v"; break;
558 case '\a': Out << "\\a"; break;
559 case '\"': Out << "\\\""; break;
560 case '\'': Out << "\\\'"; break;
563 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
564 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
573 if (CPA->getNumOperands()) {
575 printConstant(cast<Constant>(CPA->getOperand(0)));
576 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
578 printConstant(cast<Constant>(CPA->getOperand(i)));
585 void CWriter::printConstantVector(ConstantVector *CP) {
587 if (CP->getNumOperands()) {
589 printConstant(cast<Constant>(CP->getOperand(0)));
590 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
592 printConstant(cast<Constant>(CP->getOperand(i)));
598 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
599 // textually as a double (rather than as a reference to a stack-allocated
600 // variable). We decide this by converting CFP to a string and back into a
601 // double, and then checking whether the conversion results in a bit-equal
602 // double to the original value of CFP. This depends on us and the target C
603 // compiler agreeing on the conversion process (which is pretty likely since we
604 // only deal in IEEE FP).
606 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
607 APFloat APF = APFloat(CFP->getValueAPF()); // copy
608 if (CFP->getType()==Type::FloatTy)
609 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven);
610 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
612 sprintf(Buffer, "%a", APF.convertToDouble());
613 if (!strncmp(Buffer, "0x", 2) ||
614 !strncmp(Buffer, "-0x", 3) ||
615 !strncmp(Buffer, "+0x", 3))
616 return APF.bitwiseIsEqual(APFloat(atof(Buffer)));
619 std::string StrVal = ftostr(APF);
621 while (StrVal[0] == ' ')
622 StrVal.erase(StrVal.begin());
624 // Check to make sure that the stringized number is not some string like "Inf"
625 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
626 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
627 ((StrVal[0] == '-' || StrVal[0] == '+') &&
628 (StrVal[1] >= '0' && StrVal[1] <= '9')))
629 // Reparse stringized version!
630 return APF.bitwiseIsEqual(APFloat(atof(StrVal.c_str())));
635 /// Print out the casting for a cast operation. This does the double casting
636 /// necessary for conversion to the destination type, if necessary.
637 /// @brief Print a cast
638 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
639 // Print the destination type cast
641 case Instruction::UIToFP:
642 case Instruction::SIToFP:
643 case Instruction::IntToPtr:
644 case Instruction::Trunc:
645 case Instruction::BitCast:
646 case Instruction::FPExt:
647 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
649 printType(Out, DstTy);
652 case Instruction::ZExt:
653 case Instruction::PtrToInt:
654 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
656 printSimpleType(Out, DstTy, false);
659 case Instruction::SExt:
660 case Instruction::FPToSI: // For these, make sure we get a signed dest
662 printSimpleType(Out, DstTy, true);
666 assert(0 && "Invalid cast opcode");
669 // Print the source type cast
671 case Instruction::UIToFP:
672 case Instruction::ZExt:
674 printSimpleType(Out, SrcTy, false);
677 case Instruction::SIToFP:
678 case Instruction::SExt:
680 printSimpleType(Out, SrcTy, true);
683 case Instruction::IntToPtr:
684 case Instruction::PtrToInt:
685 // Avoid "cast to pointer from integer of different size" warnings
686 Out << "(unsigned long)";
688 case Instruction::Trunc:
689 case Instruction::BitCast:
690 case Instruction::FPExt:
691 case Instruction::FPTrunc:
692 case Instruction::FPToSI:
693 case Instruction::FPToUI:
694 break; // These don't need a source cast.
696 assert(0 && "Invalid cast opcode");
701 // printConstant - The LLVM Constant to C Constant converter.
702 void CWriter::printConstant(Constant *CPV) {
703 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
704 switch (CE->getOpcode()) {
705 case Instruction::Trunc:
706 case Instruction::ZExt:
707 case Instruction::SExt:
708 case Instruction::FPTrunc:
709 case Instruction::FPExt:
710 case Instruction::UIToFP:
711 case Instruction::SIToFP:
712 case Instruction::FPToUI:
713 case Instruction::FPToSI:
714 case Instruction::PtrToInt:
715 case Instruction::IntToPtr:
716 case Instruction::BitCast:
718 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
719 if (CE->getOpcode() == Instruction::SExt &&
720 CE->getOperand(0)->getType() == Type::Int1Ty) {
721 // Make sure we really sext from bool here by subtracting from 0
724 printConstant(CE->getOperand(0));
725 if (CE->getType() == Type::Int1Ty &&
726 (CE->getOpcode() == Instruction::Trunc ||
727 CE->getOpcode() == Instruction::FPToUI ||
728 CE->getOpcode() == Instruction::FPToSI ||
729 CE->getOpcode() == Instruction::PtrToInt)) {
730 // Make sure we really truncate to bool here by anding with 1
736 case Instruction::GetElementPtr:
738 printIndexingExpression(CE->getOperand(0), gep_type_begin(CPV),
742 case Instruction::Select:
744 printConstant(CE->getOperand(0));
746 printConstant(CE->getOperand(1));
748 printConstant(CE->getOperand(2));
751 case Instruction::Add:
752 case Instruction::Sub:
753 case Instruction::Mul:
754 case Instruction::SDiv:
755 case Instruction::UDiv:
756 case Instruction::FDiv:
757 case Instruction::URem:
758 case Instruction::SRem:
759 case Instruction::FRem:
760 case Instruction::And:
761 case Instruction::Or:
762 case Instruction::Xor:
763 case Instruction::ICmp:
764 case Instruction::Shl:
765 case Instruction::LShr:
766 case Instruction::AShr:
769 bool NeedsClosingParens = printConstExprCast(CE);
770 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
771 switch (CE->getOpcode()) {
772 case Instruction::Add: Out << " + "; break;
773 case Instruction::Sub: Out << " - "; break;
774 case Instruction::Mul: Out << " * "; break;
775 case Instruction::URem:
776 case Instruction::SRem:
777 case Instruction::FRem: Out << " % "; break;
778 case Instruction::UDiv:
779 case Instruction::SDiv:
780 case Instruction::FDiv: Out << " / "; break;
781 case Instruction::And: Out << " & "; break;
782 case Instruction::Or: Out << " | "; break;
783 case Instruction::Xor: Out << " ^ "; break;
784 case Instruction::Shl: Out << " << "; break;
785 case Instruction::LShr:
786 case Instruction::AShr: Out << " >> "; break;
787 case Instruction::ICmp:
788 switch (CE->getPredicate()) {
789 case ICmpInst::ICMP_EQ: Out << " == "; break;
790 case ICmpInst::ICMP_NE: Out << " != "; break;
791 case ICmpInst::ICMP_SLT:
792 case ICmpInst::ICMP_ULT: Out << " < "; break;
793 case ICmpInst::ICMP_SLE:
794 case ICmpInst::ICMP_ULE: Out << " <= "; break;
795 case ICmpInst::ICMP_SGT:
796 case ICmpInst::ICMP_UGT: Out << " > "; break;
797 case ICmpInst::ICMP_SGE:
798 case ICmpInst::ICMP_UGE: Out << " >= "; break;
799 default: assert(0 && "Illegal ICmp predicate");
802 default: assert(0 && "Illegal opcode here!");
804 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
805 if (NeedsClosingParens)
810 case Instruction::FCmp: {
812 bool NeedsClosingParens = printConstExprCast(CE);
813 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
815 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
819 switch (CE->getPredicate()) {
820 default: assert(0 && "Illegal FCmp predicate");
821 case FCmpInst::FCMP_ORD: op = "ord"; break;
822 case FCmpInst::FCMP_UNO: op = "uno"; break;
823 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
824 case FCmpInst::FCMP_UNE: op = "une"; break;
825 case FCmpInst::FCMP_ULT: op = "ult"; break;
826 case FCmpInst::FCMP_ULE: op = "ule"; break;
827 case FCmpInst::FCMP_UGT: op = "ugt"; break;
828 case FCmpInst::FCMP_UGE: op = "uge"; break;
829 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
830 case FCmpInst::FCMP_ONE: op = "one"; break;
831 case FCmpInst::FCMP_OLT: op = "olt"; break;
832 case FCmpInst::FCMP_OLE: op = "ole"; break;
833 case FCmpInst::FCMP_OGT: op = "ogt"; break;
834 case FCmpInst::FCMP_OGE: op = "oge"; break;
836 Out << "llvm_fcmp_" << op << "(";
837 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
839 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
842 if (NeedsClosingParens)
847 cerr << "CWriter Error: Unhandled constant expression: "
851 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
853 printType(Out, CPV->getType()); // sign doesn't matter
854 Out << ")/*UNDEF*/0)";
858 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
859 const Type* Ty = CI->getType();
860 if (Ty == Type::Int1Ty)
861 Out << (CI->getZExtValue() ? '1' : '0') ;
864 printSimpleType(Out, Ty, false) << ')';
865 if (CI->isMinValue(true))
866 Out << CI->getZExtValue() << 'u';
868 Out << CI->getSExtValue();
869 if (Ty->getPrimitiveSizeInBits() > 32)
876 switch (CPV->getType()->getTypeID()) {
877 case Type::FloatTyID:
878 case Type::DoubleTyID: {
879 ConstantFP *FPC = cast<ConstantFP>(CPV);
880 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
881 if (I != FPConstantMap.end()) {
882 // Because of FP precision problems we must load from a stack allocated
883 // value that holds the value in hex.
884 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
885 << "*)&FPConstant" << I->second << ')';
887 double V = FPC->getType() == Type::FloatTy ?
888 FPC->getValueAPF().convertToFloat() :
889 FPC->getValueAPF().convertToDouble();
893 // FIXME the actual NaN bits should be emitted.
894 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
896 const unsigned long QuietNaN = 0x7ff8UL;
897 //const unsigned long SignalNaN = 0x7ff4UL;
899 // We need to grab the first part of the FP #
902 uint64_t ll = DoubleToBits(V);
903 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
905 std::string Num(&Buffer[0], &Buffer[6]);
906 unsigned long Val = strtoul(Num.c_str(), 0, 16);
908 if (FPC->getType() == Type::FloatTy)
909 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
910 << Buffer << "\") /*nan*/ ";
912 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
913 << Buffer << "\") /*nan*/ ";
914 } else if (IsInf(V)) {
916 if (V < 0) Out << '-';
917 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
921 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
922 // Print out the constant as a floating point number.
924 sprintf(Buffer, "%a", V);
927 Num = ftostr(FPC->getValueAPF());
935 case Type::ArrayTyID:
936 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
937 const ArrayType *AT = cast<ArrayType>(CPV->getType());
939 if (AT->getNumElements()) {
941 Constant *CZ = Constant::getNullValue(AT->getElementType());
943 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
950 printConstantArray(cast<ConstantArray>(CPV));
954 case Type::VectorTyID:
955 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
956 const VectorType *AT = cast<VectorType>(CPV->getType());
958 if (AT->getNumElements()) {
960 Constant *CZ = Constant::getNullValue(AT->getElementType());
962 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
969 printConstantVector(cast<ConstantVector>(CPV));
973 case Type::StructTyID:
974 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
975 const StructType *ST = cast<StructType>(CPV->getType());
977 if (ST->getNumElements()) {
979 printConstant(Constant::getNullValue(ST->getElementType(0)));
980 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
982 printConstant(Constant::getNullValue(ST->getElementType(i)));
988 if (CPV->getNumOperands()) {
990 printConstant(cast<Constant>(CPV->getOperand(0)));
991 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
993 printConstant(cast<Constant>(CPV->getOperand(i)));
1000 case Type::PointerTyID:
1001 if (isa<ConstantPointerNull>(CPV)) {
1003 printType(Out, CPV->getType()); // sign doesn't matter
1004 Out << ")/*NULL*/0)";
1006 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
1012 cerr << "Unknown constant type: " << *CPV << "\n";
1017 // Some constant expressions need to be casted back to the original types
1018 // because their operands were casted to the expected type. This function takes
1019 // care of detecting that case and printing the cast for the ConstantExpr.
1020 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
1021 bool NeedsExplicitCast = false;
1022 const Type *Ty = CE->getOperand(0)->getType();
1023 bool TypeIsSigned = false;
1024 switch (CE->getOpcode()) {
1025 case Instruction::LShr:
1026 case Instruction::URem:
1027 case Instruction::UDiv: NeedsExplicitCast = true; break;
1028 case Instruction::AShr:
1029 case Instruction::SRem:
1030 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1031 case Instruction::SExt:
1033 NeedsExplicitCast = true;
1034 TypeIsSigned = true;
1036 case Instruction::ZExt:
1037 case Instruction::Trunc:
1038 case Instruction::FPTrunc:
1039 case Instruction::FPExt:
1040 case Instruction::UIToFP:
1041 case Instruction::SIToFP:
1042 case Instruction::FPToUI:
1043 case Instruction::FPToSI:
1044 case Instruction::PtrToInt:
1045 case Instruction::IntToPtr:
1046 case Instruction::BitCast:
1048 NeedsExplicitCast = true;
1052 if (NeedsExplicitCast) {
1054 if (Ty->isInteger() && Ty != Type::Int1Ty)
1055 printSimpleType(Out, Ty, TypeIsSigned);
1057 printType(Out, Ty); // not integer, sign doesn't matter
1060 return NeedsExplicitCast;
1063 // Print a constant assuming that it is the operand for a given Opcode. The
1064 // opcodes that care about sign need to cast their operands to the expected
1065 // type before the operation proceeds. This function does the casting.
1066 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1068 // Extract the operand's type, we'll need it.
1069 const Type* OpTy = CPV->getType();
1071 // Indicate whether to do the cast or not.
1072 bool shouldCast = false;
1073 bool typeIsSigned = false;
1075 // Based on the Opcode for which this Constant is being written, determine
1076 // the new type to which the operand should be casted by setting the value
1077 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1081 // for most instructions, it doesn't matter
1083 case Instruction::LShr:
1084 case Instruction::UDiv:
1085 case Instruction::URem:
1088 case Instruction::AShr:
1089 case Instruction::SDiv:
1090 case Instruction::SRem:
1092 typeIsSigned = true;
1096 // Write out the casted constant if we should, otherwise just write the
1100 printSimpleType(Out, OpTy, typeIsSigned);
1108 std::string CWriter::GetValueName(const Value *Operand) {
1111 if (!isa<GlobalValue>(Operand) && Operand->getName() != "") {
1112 std::string VarName;
1114 Name = Operand->getName();
1115 VarName.reserve(Name.capacity());
1117 for (std::string::iterator I = Name.begin(), E = Name.end();
1121 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1122 (ch >= '0' && ch <= '9') || ch == '_'))
1128 Name = "llvm_cbe_" + VarName;
1130 Name = Mang->getValueName(Operand);
1136 void CWriter::writeOperandInternal(Value *Operand) {
1137 if (Instruction *I = dyn_cast<Instruction>(Operand))
1138 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1139 // Should we inline this instruction to build a tree?
1146 Constant* CPV = dyn_cast<Constant>(Operand);
1148 if (CPV && !isa<GlobalValue>(CPV))
1151 Out << GetValueName(Operand);
1154 void CWriter::writeOperandRaw(Value *Operand) {
1155 Constant* CPV = dyn_cast<Constant>(Operand);
1156 if (CPV && !isa<GlobalValue>(CPV)) {
1159 Out << GetValueName(Operand);
1163 void CWriter::writeOperand(Value *Operand) {
1164 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1165 Out << "(&"; // Global variables are referenced as their addresses by llvm
1167 writeOperandInternal(Operand);
1169 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1173 // Some instructions need to have their result value casted back to the
1174 // original types because their operands were casted to the expected type.
1175 // This function takes care of detecting that case and printing the cast
1176 // for the Instruction.
1177 bool CWriter::writeInstructionCast(const Instruction &I) {
1178 const Type *Ty = I.getOperand(0)->getType();
1179 switch (I.getOpcode()) {
1180 case Instruction::LShr:
1181 case Instruction::URem:
1182 case Instruction::UDiv:
1184 printSimpleType(Out, Ty, false);
1187 case Instruction::AShr:
1188 case Instruction::SRem:
1189 case Instruction::SDiv:
1191 printSimpleType(Out, Ty, true);
1199 // Write the operand with a cast to another type based on the Opcode being used.
1200 // This will be used in cases where an instruction has specific type
1201 // requirements (usually signedness) for its operands.
1202 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1204 // Extract the operand's type, we'll need it.
1205 const Type* OpTy = Operand->getType();
1207 // Indicate whether to do the cast or not.
1208 bool shouldCast = false;
1210 // Indicate whether the cast should be to a signed type or not.
1211 bool castIsSigned = false;
1213 // Based on the Opcode for which this Operand is being written, determine
1214 // the new type to which the operand should be casted by setting the value
1215 // of OpTy. If we change OpTy, also set shouldCast to true.
1218 // for most instructions, it doesn't matter
1220 case Instruction::LShr:
1221 case Instruction::UDiv:
1222 case Instruction::URem: // Cast to unsigned first
1224 castIsSigned = false;
1226 case Instruction::AShr:
1227 case Instruction::SDiv:
1228 case Instruction::SRem: // Cast to signed first
1230 castIsSigned = true;
1234 // Write out the casted operand if we should, otherwise just write the
1238 printSimpleType(Out, OpTy, castIsSigned);
1240 writeOperand(Operand);
1243 writeOperand(Operand);
1246 // Write the operand with a cast to another type based on the icmp predicate
1248 void CWriter::writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate) {
1250 // Extract the operand's type, we'll need it.
1251 const Type* OpTy = Operand->getType();
1253 // Indicate whether to do the cast or not.
1254 bool shouldCast = false;
1256 // Indicate whether the cast should be to a signed type or not.
1257 bool castIsSigned = false;
1259 // Based on the Opcode for which this Operand is being written, determine
1260 // the new type to which the operand should be casted by setting the value
1261 // of OpTy. If we change OpTy, also set shouldCast to true.
1262 switch (predicate) {
1264 // for eq and ne, it doesn't matter
1266 case ICmpInst::ICMP_UGT:
1267 case ICmpInst::ICMP_UGE:
1268 case ICmpInst::ICMP_ULT:
1269 case ICmpInst::ICMP_ULE:
1272 case ICmpInst::ICMP_SGT:
1273 case ICmpInst::ICMP_SGE:
1274 case ICmpInst::ICMP_SLT:
1275 case ICmpInst::ICMP_SLE:
1277 castIsSigned = true;
1281 // Write out the casted operand if we should, otherwise just write the
1285 if (OpTy->isInteger() && OpTy != Type::Int1Ty)
1286 printSimpleType(Out, OpTy, castIsSigned);
1288 printType(Out, OpTy); // not integer, sign doesn't matter
1290 writeOperand(Operand);
1293 writeOperand(Operand);
1296 // generateCompilerSpecificCode - This is where we add conditional compilation
1297 // directives to cater to specific compilers as need be.
1299 static void generateCompilerSpecificCode(std::ostream& Out) {
1300 // Alloca is hard to get, and we don't want to include stdlib.h here.
1301 Out << "/* get a declaration for alloca */\n"
1302 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1303 << "#define alloca(x) __builtin_alloca((x))\n"
1304 << "#define _alloca(x) __builtin_alloca((x))\n"
1305 << "#elif defined(__APPLE__)\n"
1306 << "extern void *__builtin_alloca(unsigned long);\n"
1307 << "#define alloca(x) __builtin_alloca(x)\n"
1308 << "#define longjmp _longjmp\n"
1309 << "#define setjmp _setjmp\n"
1310 << "#elif defined(__sun__)\n"
1311 << "#if defined(__sparcv9)\n"
1312 << "extern void *__builtin_alloca(unsigned long);\n"
1314 << "extern void *__builtin_alloca(unsigned int);\n"
1316 << "#define alloca(x) __builtin_alloca(x)\n"
1317 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1318 << "#define alloca(x) __builtin_alloca(x)\n"
1319 << "#elif defined(_MSC_VER)\n"
1320 << "#define inline _inline\n"
1321 << "#define alloca(x) _alloca(x)\n"
1323 << "#include <alloca.h>\n"
1326 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1327 // If we aren't being compiled with GCC, just drop these attributes.
1328 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1329 << "#define __attribute__(X)\n"
1332 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1333 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1334 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1335 << "#elif defined(__GNUC__)\n"
1336 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1338 << "#define __EXTERNAL_WEAK__\n"
1341 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1342 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1343 << "#define __ATTRIBUTE_WEAK__\n"
1344 << "#elif defined(__GNUC__)\n"
1345 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1347 << "#define __ATTRIBUTE_WEAK__\n"
1350 // Add hidden visibility support. FIXME: APPLE_CC?
1351 Out << "#if defined(__GNUC__)\n"
1352 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1355 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1356 // From the GCC documentation:
1358 // double __builtin_nan (const char *str)
1360 // This is an implementation of the ISO C99 function nan.
1362 // Since ISO C99 defines this function in terms of strtod, which we do
1363 // not implement, a description of the parsing is in order. The string is
1364 // parsed as by strtol; that is, the base is recognized by leading 0 or
1365 // 0x prefixes. The number parsed is placed in the significand such that
1366 // the least significant bit of the number is at the least significant
1367 // bit of the significand. The number is truncated to fit the significand
1368 // field provided. The significand is forced to be a quiet NaN.
1370 // This function, if given a string literal, is evaluated early enough
1371 // that it is considered a compile-time constant.
1373 // float __builtin_nanf (const char *str)
1375 // Similar to __builtin_nan, except the return type is float.
1377 // double __builtin_inf (void)
1379 // Similar to __builtin_huge_val, except a warning is generated if the
1380 // target floating-point format does not support infinities. This
1381 // function is suitable for implementing the ISO C99 macro INFINITY.
1383 // float __builtin_inff (void)
1385 // Similar to __builtin_inf, except the return type is float.
1386 Out << "#ifdef __GNUC__\n"
1387 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1388 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1389 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1390 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1391 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1392 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1393 << "#define LLVM_PREFETCH(addr,rw,locality) "
1394 "__builtin_prefetch(addr,rw,locality)\n"
1395 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1396 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1397 << "#define LLVM_ASM __asm__\n"
1399 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1400 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1401 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1402 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1403 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1404 << "#define LLVM_INFF 0.0F /* Float */\n"
1405 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1406 << "#define __ATTRIBUTE_CTOR__\n"
1407 << "#define __ATTRIBUTE_DTOR__\n"
1408 << "#define LLVM_ASM(X)\n"
1411 Out << "#if __GNUC__ < 4 /* Old GCC's, or compilers not GCC */ \n"
1412 << "#define __builtin_stack_save() 0 /* not implemented */\n"
1413 << "#define __builtin_stack_restore(X) /* noop */\n"
1416 // Output target-specific code that should be inserted into main.
1417 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1420 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1421 /// the StaticTors set.
1422 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1423 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1424 if (!InitList) return;
1426 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1427 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1428 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1430 if (CS->getOperand(1)->isNullValue())
1431 return; // Found a null terminator, exit printing.
1432 Constant *FP = CS->getOperand(1);
1433 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1435 FP = CE->getOperand(0);
1436 if (Function *F = dyn_cast<Function>(FP))
1437 StaticTors.insert(F);
1441 enum SpecialGlobalClass {
1443 GlobalCtors, GlobalDtors,
1447 /// getGlobalVariableClass - If this is a global that is specially recognized
1448 /// by LLVM, return a code that indicates how we should handle it.
1449 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1450 // If this is a global ctors/dtors list, handle it now.
1451 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1452 if (GV->getName() == "llvm.global_ctors")
1454 else if (GV->getName() == "llvm.global_dtors")
1458 // Otherwise, it it is other metadata, don't print it. This catches things
1459 // like debug information.
1460 if (GV->getSection() == "llvm.metadata")
1467 bool CWriter::doInitialization(Module &M) {
1471 TD = new TargetData(&M);
1472 IL = new IntrinsicLowering(*TD);
1473 IL->AddPrototypes(M);
1475 // Ensure that all structure types have names...
1476 Mang = new Mangler(M);
1477 Mang->markCharUnacceptable('.');
1479 // Keep track of which functions are static ctors/dtors so they can have
1480 // an attribute added to their prototypes.
1481 std::set<Function*> StaticCtors, StaticDtors;
1482 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1484 switch (getGlobalVariableClass(I)) {
1487 FindStaticTors(I, StaticCtors);
1490 FindStaticTors(I, StaticDtors);
1495 // get declaration for alloca
1496 Out << "/* Provide Declarations */\n";
1497 Out << "#include <stdarg.h>\n"; // Varargs support
1498 Out << "#include <setjmp.h>\n"; // Unwind support
1499 generateCompilerSpecificCode(Out);
1501 // Provide a definition for `bool' if not compiling with a C++ compiler.
1503 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1505 << "\n\n/* Support for floating point constants */\n"
1506 << "typedef unsigned long long ConstantDoubleTy;\n"
1507 << "typedef unsigned int ConstantFloatTy;\n"
1509 << "\n\n/* Global Declarations */\n";
1511 // First output all the declarations for the program, because C requires
1512 // Functions & globals to be declared before they are used.
1515 // Loop over the symbol table, emitting all named constants...
1516 printModuleTypes(M.getTypeSymbolTable());
1518 // Global variable declarations...
1519 if (!M.global_empty()) {
1520 Out << "\n/* External Global Variable Declarations */\n";
1521 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1524 if (I->hasExternalLinkage() || I->hasExternalWeakLinkage())
1526 else if (I->hasDLLImportLinkage())
1527 Out << "__declspec(dllimport) ";
1529 continue; // Internal Global
1531 // Thread Local Storage
1532 if (I->isThreadLocal())
1535 printType(Out, I->getType()->getElementType(), false, GetValueName(I));
1537 if (I->hasExternalWeakLinkage())
1538 Out << " __EXTERNAL_WEAK__";
1543 // Function declarations
1544 Out << "\n/* Function Declarations */\n";
1545 Out << "double fmod(double, double);\n"; // Support for FP rem
1546 Out << "float fmodf(float, float);\n";
1548 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1549 // Don't print declarations for intrinsic functions.
1550 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1551 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1552 if (I->hasExternalWeakLinkage())
1554 printFunctionSignature(I, true);
1555 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1556 Out << " __ATTRIBUTE_WEAK__";
1557 if (I->hasExternalWeakLinkage())
1558 Out << " __EXTERNAL_WEAK__";
1559 if (StaticCtors.count(I))
1560 Out << " __ATTRIBUTE_CTOR__";
1561 if (StaticDtors.count(I))
1562 Out << " __ATTRIBUTE_DTOR__";
1563 if (I->hasHiddenVisibility())
1564 Out << " __HIDDEN__";
1566 if (I->hasName() && I->getName()[0] == 1)
1567 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1573 // Output the global variable declarations
1574 if (!M.global_empty()) {
1575 Out << "\n\n/* Global Variable Declarations */\n";
1576 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1578 if (!I->isDeclaration()) {
1579 // Ignore special globals, such as debug info.
1580 if (getGlobalVariableClass(I))
1583 if (I->hasInternalLinkage())
1588 // Thread Local Storage
1589 if (I->isThreadLocal())
1592 printType(Out, I->getType()->getElementType(), false,
1595 if (I->hasLinkOnceLinkage())
1596 Out << " __attribute__((common))";
1597 else if (I->hasWeakLinkage())
1598 Out << " __ATTRIBUTE_WEAK__";
1599 else if (I->hasExternalWeakLinkage())
1600 Out << " __EXTERNAL_WEAK__";
1601 if (I->hasHiddenVisibility())
1602 Out << " __HIDDEN__";
1607 // Output the global variable definitions and contents...
1608 if (!M.global_empty()) {
1609 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1610 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1612 if (!I->isDeclaration()) {
1613 // Ignore special globals, such as debug info.
1614 if (getGlobalVariableClass(I))
1617 if (I->hasInternalLinkage())
1619 else if (I->hasDLLImportLinkage())
1620 Out << "__declspec(dllimport) ";
1621 else if (I->hasDLLExportLinkage())
1622 Out << "__declspec(dllexport) ";
1624 // Thread Local Storage
1625 if (I->isThreadLocal())
1628 printType(Out, I->getType()->getElementType(), false,
1630 if (I->hasLinkOnceLinkage())
1631 Out << " __attribute__((common))";
1632 else if (I->hasWeakLinkage())
1633 Out << " __ATTRIBUTE_WEAK__";
1635 if (I->hasHiddenVisibility())
1636 Out << " __HIDDEN__";
1638 // If the initializer is not null, emit the initializer. If it is null,
1639 // we try to avoid emitting large amounts of zeros. The problem with
1640 // this, however, occurs when the variable has weak linkage. In this
1641 // case, the assembler will complain about the variable being both weak
1642 // and common, so we disable this optimization.
1643 if (!I->getInitializer()->isNullValue()) {
1645 writeOperand(I->getInitializer());
1646 } else if (I->hasWeakLinkage()) {
1647 // We have to specify an initializer, but it doesn't have to be
1648 // complete. If the value is an aggregate, print out { 0 }, and let
1649 // the compiler figure out the rest of the zeros.
1651 if (isa<StructType>(I->getInitializer()->getType()) ||
1652 isa<ArrayType>(I->getInitializer()->getType()) ||
1653 isa<VectorType>(I->getInitializer()->getType())) {
1656 // Just print it out normally.
1657 writeOperand(I->getInitializer());
1665 Out << "\n\n/* Function Bodies */\n";
1667 // Emit some helper functions for dealing with FCMP instruction's
1669 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1670 Out << "return X == X && Y == Y; }\n";
1671 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1672 Out << "return X != X || Y != Y; }\n";
1673 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1674 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1675 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1676 Out << "return X != Y; }\n";
1677 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1678 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1679 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1680 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1681 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1682 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1683 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1684 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1685 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1686 Out << "return X == Y ; }\n";
1687 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1688 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1689 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1690 Out << "return X < Y ; }\n";
1691 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1692 Out << "return X > Y ; }\n";
1693 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1694 Out << "return X <= Y ; }\n";
1695 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1696 Out << "return X >= Y ; }\n";
1701 /// Output all floating point constants that cannot be printed accurately...
1702 void CWriter::printFloatingPointConstants(Function &F) {
1703 // Scan the module for floating point constants. If any FP constant is used
1704 // in the function, we want to redirect it here so that we do not depend on
1705 // the precision of the printed form, unless the printed form preserves
1708 static unsigned FPCounter = 0;
1709 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1711 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1712 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1713 !FPConstantMap.count(FPC)) {
1714 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1716 if (FPC->getType() == Type::DoubleTy) {
1717 double Val = FPC->getValueAPF().convertToDouble();
1718 uint64_t i = FPC->getValueAPF().convertToAPInt().getZExtValue();
1719 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1720 << " = 0x" << std::hex << i << std::dec
1721 << "ULL; /* " << Val << " */\n";
1722 } else if (FPC->getType() == Type::FloatTy) {
1723 float Val = FPC->getValueAPF().convertToFloat();
1724 uint32_t i = (uint32_t)FPC->getValueAPF().convertToAPInt().
1726 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1727 << " = 0x" << std::hex << i << std::dec
1728 << "U; /* " << Val << " */\n";
1730 assert(0 && "Unknown float type!");
1737 /// printSymbolTable - Run through symbol table looking for type names. If a
1738 /// type name is found, emit its declaration...
1740 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1741 Out << "/* Helper union for bitcasts */\n";
1742 Out << "typedef union {\n";
1743 Out << " unsigned int Int32;\n";
1744 Out << " unsigned long long Int64;\n";
1745 Out << " float Float;\n";
1746 Out << " double Double;\n";
1747 Out << "} llvmBitCastUnion;\n";
1749 // We are only interested in the type plane of the symbol table.
1750 TypeSymbolTable::const_iterator I = TST.begin();
1751 TypeSymbolTable::const_iterator End = TST.end();
1753 // If there are no type names, exit early.
1754 if (I == End) return;
1756 // Print out forward declarations for structure types before anything else!
1757 Out << "/* Structure forward decls */\n";
1758 for (; I != End; ++I) {
1759 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1760 Out << Name << ";\n";
1761 TypeNames.insert(std::make_pair(I->second, Name));
1766 // Now we can print out typedefs. Above, we guaranteed that this can only be
1767 // for struct or opaque types.
1768 Out << "/* Typedefs */\n";
1769 for (I = TST.begin(); I != End; ++I) {
1770 std::string Name = "l_" + Mang->makeNameProper(I->first);
1772 printType(Out, I->second, false, Name);
1778 // Keep track of which structures have been printed so far...
1779 std::set<const StructType *> StructPrinted;
1781 // Loop over all structures then push them into the stack so they are
1782 // printed in the correct order.
1784 Out << "/* Structure contents */\n";
1785 for (I = TST.begin(); I != End; ++I)
1786 if (const StructType *STy = dyn_cast<StructType>(I->second))
1787 // Only print out used types!
1788 printContainedStructs(STy, StructPrinted);
1791 // Push the struct onto the stack and recursively push all structs
1792 // this one depends on.
1794 // TODO: Make this work properly with vector types
1796 void CWriter::printContainedStructs(const Type *Ty,
1797 std::set<const StructType*> &StructPrinted){
1798 // Don't walk through pointers.
1799 if (isa<PointerType>(Ty) || Ty->isPrimitiveType() || Ty->isInteger()) return;
1801 // Print all contained types first.
1802 for (Type::subtype_iterator I = Ty->subtype_begin(),
1803 E = Ty->subtype_end(); I != E; ++I)
1804 printContainedStructs(*I, StructPrinted);
1806 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1807 // Check to see if we have already printed this struct.
1808 if (StructPrinted.insert(STy).second) {
1809 // Print structure type out.
1810 std::string Name = TypeNames[STy];
1811 printType(Out, STy, false, Name, true);
1817 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1818 /// isStructReturn - Should this function actually return a struct by-value?
1819 bool isStructReturn = F->getFunctionType()->isStructReturn();
1821 if (F->hasInternalLinkage()) Out << "static ";
1822 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1823 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1824 switch (F->getCallingConv()) {
1825 case CallingConv::X86_StdCall:
1826 Out << "__stdcall ";
1828 case CallingConv::X86_FastCall:
1829 Out << "__fastcall ";
1833 // Loop over the arguments, printing them...
1834 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1835 const ParamAttrsList *Attrs = FT->getParamAttrs();
1837 std::stringstream FunctionInnards;
1839 // Print out the name...
1840 FunctionInnards << GetValueName(F) << '(';
1842 bool PrintedArg = false;
1843 if (!F->isDeclaration()) {
1844 if (!F->arg_empty()) {
1845 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1847 // If this is a struct-return function, don't print the hidden
1848 // struct-return argument.
1849 if (isStructReturn) {
1850 assert(I != E && "Invalid struct return function!");
1854 std::string ArgName;
1856 for (; I != E; ++I) {
1857 if (PrintedArg) FunctionInnards << ", ";
1858 if (I->hasName() || !Prototype)
1859 ArgName = GetValueName(I);
1862 printType(FunctionInnards, I->getType(),
1863 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt),
1870 // Loop over the arguments, printing them.
1871 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1873 // If this is a struct-return function, don't print the hidden
1874 // struct-return argument.
1875 if (isStructReturn) {
1876 assert(I != E && "Invalid struct return function!");
1881 for (; I != E; ++I) {
1882 if (PrintedArg) FunctionInnards << ", ";
1883 printType(FunctionInnards, *I,
1884 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt));
1890 // Finish printing arguments... if this is a vararg function, print the ...,
1891 // unless there are no known types, in which case, we just emit ().
1893 if (FT->isVarArg() && PrintedArg) {
1894 if (PrintedArg) FunctionInnards << ", ";
1895 FunctionInnards << "..."; // Output varargs portion of signature!
1896 } else if (!FT->isVarArg() && !PrintedArg) {
1897 FunctionInnards << "void"; // ret() -> ret(void) in C.
1899 FunctionInnards << ')';
1901 // Get the return tpe for the function.
1903 if (!isStructReturn)
1904 RetTy = F->getReturnType();
1906 // If this is a struct-return function, print the struct-return type.
1907 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1910 // Print out the return type and the signature built above.
1911 printType(Out, RetTy,
1912 /*isSigned=*/ Attrs && Attrs->paramHasAttr(0, ParamAttr::SExt),
1913 FunctionInnards.str());
1916 static inline bool isFPIntBitCast(const Instruction &I) {
1917 if (!isa<BitCastInst>(I))
1919 const Type *SrcTy = I.getOperand(0)->getType();
1920 const Type *DstTy = I.getType();
1921 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1922 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1925 void CWriter::printFunction(Function &F) {
1926 /// isStructReturn - Should this function actually return a struct by-value?
1927 bool isStructReturn = F.getFunctionType()->isStructReturn();
1929 printFunctionSignature(&F, false);
1932 // If this is a struct return function, handle the result with magic.
1933 if (isStructReturn) {
1934 const Type *StructTy =
1935 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1937 printType(Out, StructTy, false, "StructReturn");
1938 Out << "; /* Struct return temporary */\n";
1941 printType(Out, F.arg_begin()->getType(), false,
1942 GetValueName(F.arg_begin()));
1943 Out << " = &StructReturn;\n";
1946 bool PrintedVar = false;
1948 // print local variable information for the function
1949 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1950 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1952 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
1953 Out << "; /* Address-exposed local */\n";
1955 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1957 printType(Out, I->getType(), false, GetValueName(&*I));
1960 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1962 printType(Out, I->getType(), false,
1963 GetValueName(&*I)+"__PHI_TEMPORARY");
1968 // We need a temporary for the BitCast to use so it can pluck a value out
1969 // of a union to do the BitCast. This is separate from the need for a
1970 // variable to hold the result of the BitCast.
1971 if (isFPIntBitCast(*I)) {
1972 Out << " llvmBitCastUnion " << GetValueName(&*I)
1973 << "__BITCAST_TEMPORARY;\n";
1981 if (F.hasExternalLinkage() && F.getName() == "main")
1982 Out << " CODE_FOR_MAIN();\n";
1984 // print the basic blocks
1985 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1986 if (Loop *L = LI->getLoopFor(BB)) {
1987 if (L->getHeader() == BB && L->getParentLoop() == 0)
1990 printBasicBlock(BB);
1997 void CWriter::printLoop(Loop *L) {
1998 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1999 << "' to make GCC happy */\n";
2000 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
2001 BasicBlock *BB = L->getBlocks()[i];
2002 Loop *BBLoop = LI->getLoopFor(BB);
2004 printBasicBlock(BB);
2005 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
2008 Out << " } while (1); /* end of syntactic loop '"
2009 << L->getHeader()->getName() << "' */\n";
2012 void CWriter::printBasicBlock(BasicBlock *BB) {
2014 // Don't print the label for the basic block if there are no uses, or if
2015 // the only terminator use is the predecessor basic block's terminator.
2016 // We have to scan the use list because PHI nodes use basic blocks too but
2017 // do not require a label to be generated.
2019 bool NeedsLabel = false;
2020 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
2021 if (isGotoCodeNecessary(*PI, BB)) {
2026 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2028 // Output all of the instructions in the basic block...
2029 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2031 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2032 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
2041 // Don't emit prefix or suffix for the terminator...
2042 visit(*BB->getTerminator());
2046 // Specific Instruction type classes... note that all of the casts are
2047 // necessary because we use the instruction classes as opaque types...
2049 void CWriter::visitReturnInst(ReturnInst &I) {
2050 // If this is a struct return function, return the temporary struct.
2051 bool isStructReturn = I.getParent()->getParent()->
2052 getFunctionType()->isStructReturn();
2054 if (isStructReturn) {
2055 Out << " return StructReturn;\n";
2059 // Don't output a void return if this is the last basic block in the function
2060 if (I.getNumOperands() == 0 &&
2061 &*--I.getParent()->getParent()->end() == I.getParent() &&
2062 !I.getParent()->size() == 1) {
2067 if (I.getNumOperands()) {
2069 writeOperand(I.getOperand(0));
2074 void CWriter::visitSwitchInst(SwitchInst &SI) {
2077 writeOperand(SI.getOperand(0));
2078 Out << ") {\n default:\n";
2079 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2080 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2082 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2084 writeOperand(SI.getOperand(i));
2086 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2087 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2088 printBranchToBlock(SI.getParent(), Succ, 2);
2089 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
2095 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2096 Out << " /*UNREACHABLE*/;\n";
2099 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2100 /// FIXME: This should be reenabled, but loop reordering safe!!
2103 if (next(Function::iterator(From)) != Function::iterator(To))
2104 return true; // Not the direct successor, we need a goto.
2106 //isa<SwitchInst>(From->getTerminator())
2108 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2113 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2114 BasicBlock *Successor,
2116 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2117 PHINode *PN = cast<PHINode>(I);
2118 // Now we have to do the printing.
2119 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2120 if (!isa<UndefValue>(IV)) {
2121 Out << std::string(Indent, ' ');
2122 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2124 Out << "; /* for PHI node */\n";
2129 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2131 if (isGotoCodeNecessary(CurBB, Succ)) {
2132 Out << std::string(Indent, ' ') << " goto ";
2138 // Branch instruction printing - Avoid printing out a branch to a basic block
2139 // that immediately succeeds the current one.
2141 void CWriter::visitBranchInst(BranchInst &I) {
2143 if (I.isConditional()) {
2144 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2146 writeOperand(I.getCondition());
2149 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2150 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2152 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2153 Out << " } else {\n";
2154 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2155 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2158 // First goto not necessary, assume second one is...
2160 writeOperand(I.getCondition());
2163 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2164 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2169 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2170 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2175 // PHI nodes get copied into temporary values at the end of predecessor basic
2176 // blocks. We now need to copy these temporary values into the REAL value for
2178 void CWriter::visitPHINode(PHINode &I) {
2180 Out << "__PHI_TEMPORARY";
2184 void CWriter::visitBinaryOperator(Instruction &I) {
2185 // binary instructions, shift instructions, setCond instructions.
2186 assert(!isa<PointerType>(I.getType()));
2188 // We must cast the results of binary operations which might be promoted.
2189 bool needsCast = false;
2190 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2191 || (I.getType() == Type::FloatTy)) {
2194 printType(Out, I.getType(), false);
2198 // If this is a negation operation, print it out as such. For FP, we don't
2199 // want to print "-0.0 - X".
2200 if (BinaryOperator::isNeg(&I)) {
2202 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2204 } else if (I.getOpcode() == Instruction::FRem) {
2205 // Output a call to fmod/fmodf instead of emitting a%b
2206 if (I.getType() == Type::FloatTy)
2210 writeOperand(I.getOperand(0));
2212 writeOperand(I.getOperand(1));
2216 // Write out the cast of the instruction's value back to the proper type
2218 bool NeedsClosingParens = writeInstructionCast(I);
2220 // Certain instructions require the operand to be forced to a specific type
2221 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2222 // below for operand 1
2223 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2225 switch (I.getOpcode()) {
2226 case Instruction::Add: Out << " + "; break;
2227 case Instruction::Sub: Out << " - "; break;
2228 case Instruction::Mul: Out << " * "; break;
2229 case Instruction::URem:
2230 case Instruction::SRem:
2231 case Instruction::FRem: Out << " % "; break;
2232 case Instruction::UDiv:
2233 case Instruction::SDiv:
2234 case Instruction::FDiv: Out << " / "; break;
2235 case Instruction::And: Out << " & "; break;
2236 case Instruction::Or: Out << " | "; break;
2237 case Instruction::Xor: Out << " ^ "; break;
2238 case Instruction::Shl : Out << " << "; break;
2239 case Instruction::LShr:
2240 case Instruction::AShr: Out << " >> "; break;
2241 default: cerr << "Invalid operator type!" << I; abort();
2244 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2245 if (NeedsClosingParens)
2254 void CWriter::visitICmpInst(ICmpInst &I) {
2255 // We must cast the results of icmp which might be promoted.
2256 bool needsCast = false;
2258 // Write out the cast of the instruction's value back to the proper type
2260 bool NeedsClosingParens = writeInstructionCast(I);
2262 // Certain icmp predicate require the operand to be forced to a specific type
2263 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2264 // below for operand 1
2265 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2267 switch (I.getPredicate()) {
2268 case ICmpInst::ICMP_EQ: Out << " == "; break;
2269 case ICmpInst::ICMP_NE: Out << " != "; break;
2270 case ICmpInst::ICMP_ULE:
2271 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2272 case ICmpInst::ICMP_UGE:
2273 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2274 case ICmpInst::ICMP_ULT:
2275 case ICmpInst::ICMP_SLT: Out << " < "; break;
2276 case ICmpInst::ICMP_UGT:
2277 case ICmpInst::ICMP_SGT: Out << " > "; break;
2278 default: cerr << "Invalid icmp predicate!" << I; abort();
2281 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2282 if (NeedsClosingParens)
2290 void CWriter::visitFCmpInst(FCmpInst &I) {
2291 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2295 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2301 switch (I.getPredicate()) {
2302 default: assert(0 && "Illegal FCmp predicate");
2303 case FCmpInst::FCMP_ORD: op = "ord"; break;
2304 case FCmpInst::FCMP_UNO: op = "uno"; break;
2305 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2306 case FCmpInst::FCMP_UNE: op = "une"; break;
2307 case FCmpInst::FCMP_ULT: op = "ult"; break;
2308 case FCmpInst::FCMP_ULE: op = "ule"; break;
2309 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2310 case FCmpInst::FCMP_UGE: op = "uge"; break;
2311 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2312 case FCmpInst::FCMP_ONE: op = "one"; break;
2313 case FCmpInst::FCMP_OLT: op = "olt"; break;
2314 case FCmpInst::FCMP_OLE: op = "ole"; break;
2315 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2316 case FCmpInst::FCMP_OGE: op = "oge"; break;
2319 Out << "llvm_fcmp_" << op << "(";
2320 // Write the first operand
2321 writeOperand(I.getOperand(0));
2323 // Write the second operand
2324 writeOperand(I.getOperand(1));
2328 static const char * getFloatBitCastField(const Type *Ty) {
2329 switch (Ty->getTypeID()) {
2330 default: assert(0 && "Invalid Type");
2331 case Type::FloatTyID: return "Float";
2332 case Type::DoubleTyID: return "Double";
2333 case Type::IntegerTyID: {
2334 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2343 void CWriter::visitCastInst(CastInst &I) {
2344 const Type *DstTy = I.getType();
2345 const Type *SrcTy = I.getOperand(0)->getType();
2347 if (isFPIntBitCast(I)) {
2348 // These int<->float and long<->double casts need to be handled specially
2349 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2350 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2351 writeOperand(I.getOperand(0));
2352 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2353 << getFloatBitCastField(I.getType());
2355 printCast(I.getOpcode(), SrcTy, DstTy);
2356 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::Int1Ty) {
2357 // Make sure we really get a sext from bool by subtracing the bool from 0
2360 writeOperand(I.getOperand(0));
2361 if (DstTy == Type::Int1Ty &&
2362 (I.getOpcode() == Instruction::Trunc ||
2363 I.getOpcode() == Instruction::FPToUI ||
2364 I.getOpcode() == Instruction::FPToSI ||
2365 I.getOpcode() == Instruction::PtrToInt)) {
2366 // Make sure we really get a trunc to bool by anding the operand with 1
2373 void CWriter::visitSelectInst(SelectInst &I) {
2375 writeOperand(I.getCondition());
2377 writeOperand(I.getTrueValue());
2379 writeOperand(I.getFalseValue());
2384 void CWriter::lowerIntrinsics(Function &F) {
2385 // This is used to keep track of intrinsics that get generated to a lowered
2386 // function. We must generate the prototypes before the function body which
2387 // will only be expanded on first use (by the loop below).
2388 std::vector<Function*> prototypesToGen;
2390 // Examine all the instructions in this function to find the intrinsics that
2391 // need to be lowered.
2392 for (Function::iterator BB = F.begin(), EE = F.end(); BB != EE; ++BB)
2393 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2394 if (CallInst *CI = dyn_cast<CallInst>(I++))
2395 if (Function *F = CI->getCalledFunction())
2396 switch (F->getIntrinsicID()) {
2397 case Intrinsic::not_intrinsic:
2398 case Intrinsic::vastart:
2399 case Intrinsic::vacopy:
2400 case Intrinsic::vaend:
2401 case Intrinsic::returnaddress:
2402 case Intrinsic::frameaddress:
2403 case Intrinsic::setjmp:
2404 case Intrinsic::longjmp:
2405 case Intrinsic::prefetch:
2406 case Intrinsic::dbg_stoppoint:
2407 case Intrinsic::powi_f32:
2408 case Intrinsic::powi_f64:
2409 // We directly implement these intrinsics
2412 // If this is an intrinsic that directly corresponds to a GCC
2413 // builtin, we handle it.
2414 const char *BuiltinName = "";
2415 #define GET_GCC_BUILTIN_NAME
2416 #include "llvm/Intrinsics.gen"
2417 #undef GET_GCC_BUILTIN_NAME
2418 // If we handle it, don't lower it.
2419 if (BuiltinName[0]) break;
2421 // All other intrinsic calls we must lower.
2422 Instruction *Before = 0;
2423 if (CI != &BB->front())
2424 Before = prior(BasicBlock::iterator(CI));
2426 IL->LowerIntrinsicCall(CI);
2427 if (Before) { // Move iterator to instruction after call
2432 // If the intrinsic got lowered to another call, and that call has
2433 // a definition then we need to make sure its prototype is emitted
2434 // before any calls to it.
2435 if (CallInst *Call = dyn_cast<CallInst>(I))
2436 if (Function *NewF = Call->getCalledFunction())
2437 if (!NewF->isDeclaration())
2438 prototypesToGen.push_back(NewF);
2443 // We may have collected some prototypes to emit in the loop above.
2444 // Emit them now, before the function that uses them is emitted. But,
2445 // be careful not to emit them twice.
2446 std::vector<Function*>::iterator I = prototypesToGen.begin();
2447 std::vector<Function*>::iterator E = prototypesToGen.end();
2448 for ( ; I != E; ++I) {
2449 if (intrinsicPrototypesAlreadyGenerated.insert(*I).second) {
2451 printFunctionSignature(*I, true);
2458 void CWriter::visitCallInst(CallInst &I) {
2459 //check if we have inline asm
2460 if (isInlineAsm(I)) {
2465 bool WroteCallee = false;
2467 // Handle intrinsic function calls first...
2468 if (Function *F = I.getCalledFunction())
2469 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2472 // If this is an intrinsic that directly corresponds to a GCC
2473 // builtin, we emit it here.
2474 const char *BuiltinName = "";
2475 #define GET_GCC_BUILTIN_NAME
2476 #include "llvm/Intrinsics.gen"
2477 #undef GET_GCC_BUILTIN_NAME
2478 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2484 case Intrinsic::vastart:
2487 Out << "va_start(*(va_list*)";
2488 writeOperand(I.getOperand(1));
2490 // Output the last argument to the enclosing function...
2491 if (I.getParent()->getParent()->arg_empty()) {
2492 cerr << "The C backend does not currently support zero "
2493 << "argument varargs functions, such as '"
2494 << I.getParent()->getParent()->getName() << "'!\n";
2497 writeOperand(--I.getParent()->getParent()->arg_end());
2500 case Intrinsic::vaend:
2501 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2502 Out << "0; va_end(*(va_list*)";
2503 writeOperand(I.getOperand(1));
2506 Out << "va_end(*(va_list*)0)";
2509 case Intrinsic::vacopy:
2511 Out << "va_copy(*(va_list*)";
2512 writeOperand(I.getOperand(1));
2513 Out << ", *(va_list*)";
2514 writeOperand(I.getOperand(2));
2517 case Intrinsic::returnaddress:
2518 Out << "__builtin_return_address(";
2519 writeOperand(I.getOperand(1));
2522 case Intrinsic::frameaddress:
2523 Out << "__builtin_frame_address(";
2524 writeOperand(I.getOperand(1));
2527 case Intrinsic::powi_f32:
2528 case Intrinsic::powi_f64:
2529 Out << "__builtin_powi(";
2530 writeOperand(I.getOperand(1));
2532 writeOperand(I.getOperand(2));
2535 case Intrinsic::setjmp:
2536 Out << "setjmp(*(jmp_buf*)";
2537 writeOperand(I.getOperand(1));
2540 case Intrinsic::longjmp:
2541 Out << "longjmp(*(jmp_buf*)";
2542 writeOperand(I.getOperand(1));
2544 writeOperand(I.getOperand(2));
2547 case Intrinsic::prefetch:
2548 Out << "LLVM_PREFETCH((const void *)";
2549 writeOperand(I.getOperand(1));
2551 writeOperand(I.getOperand(2));
2553 writeOperand(I.getOperand(3));
2556 case Intrinsic::dbg_stoppoint: {
2557 // If we use writeOperand directly we get a "u" suffix which is rejected
2559 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2563 << " \"" << SPI.getDirectory()
2564 << SPI.getFileName() << "\"\n";
2570 Value *Callee = I.getCalledValue();
2572 const PointerType *PTy = cast<PointerType>(Callee->getType());
2573 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2575 // If this is a call to a struct-return function, assign to the first
2576 // parameter instead of passing it to the call.
2577 bool isStructRet = FTy->isStructReturn();
2580 writeOperand(I.getOperand(1));
2584 if (I.isTailCall()) Out << " /*tail*/ ";
2587 // If this is an indirect call to a struct return function, we need to cast
2589 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2591 // GCC is a real PITA. It does not permit codegening casts of functions to
2592 // function pointers if they are in a call (it generates a trap instruction
2593 // instead!). We work around this by inserting a cast to void* in between
2594 // the function and the function pointer cast. Unfortunately, we can't just
2595 // form the constant expression here, because the folder will immediately
2598 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2599 // that void* and function pointers have the same size. :( To deal with this
2600 // in the common case, we handle casts where the number of arguments passed
2603 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2605 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2611 // Ok, just cast the pointer type.
2614 printType(Out, I.getCalledValue()->getType());
2616 printStructReturnPointerFunctionType(Out,
2617 cast<PointerType>(I.getCalledValue()->getType()));
2620 writeOperand(Callee);
2621 if (NeedsCast) Out << ')';
2626 unsigned NumDeclaredParams = FTy->getNumParams();
2628 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2630 if (isStructRet) { // Skip struct return argument.
2635 const ParamAttrsList *Attrs = FTy->getParamAttrs();
2636 bool PrintedArg = false;
2638 for (; AI != AE; ++AI, ++ArgNo, ++Idx) {
2639 if (PrintedArg) Out << ", ";
2640 if (ArgNo < NumDeclaredParams &&
2641 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2643 printType(Out, FTy->getParamType(ArgNo),
2644 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt));
2654 //This converts the llvm constraint string to something gcc is expecting.
2655 //TODO: work out platform independent constraints and factor those out
2656 // of the per target tables
2657 // handle multiple constraint codes
2658 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2660 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2662 const char** table = 0;
2664 //Grab the translation table from TargetAsmInfo if it exists
2667 const TargetMachineRegistry::Entry* Match =
2668 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2670 //Per platform Target Machines don't exist, so create it
2671 // this must be done only once
2672 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2673 TAsm = TM->getTargetAsmInfo();
2677 table = TAsm->getAsmCBE();
2679 //Search the translation table if it exists
2680 for (int i = 0; table && table[i]; i += 2)
2681 if (c.Codes[0] == table[i])
2684 //default is identity
2688 //TODO: import logic from AsmPrinter.cpp
2689 static std::string gccifyAsm(std::string asmstr) {
2690 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2691 if (asmstr[i] == '\n')
2692 asmstr.replace(i, 1, "\\n");
2693 else if (asmstr[i] == '\t')
2694 asmstr.replace(i, 1, "\\t");
2695 else if (asmstr[i] == '$') {
2696 if (asmstr[i + 1] == '{') {
2697 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2698 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2699 std::string n = "%" +
2700 asmstr.substr(a + 1, b - a - 1) +
2701 asmstr.substr(i + 2, a - i - 2);
2702 asmstr.replace(i, b - i + 1, n);
2705 asmstr.replace(i, 1, "%");
2707 else if (asmstr[i] == '%')//grr
2708 { asmstr.replace(i, 1, "%%"); ++i;}
2713 //TODO: assumptions about what consume arguments from the call are likely wrong
2714 // handle communitivity
2715 void CWriter::visitInlineAsm(CallInst &CI) {
2716 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2717 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2718 std::vector<std::pair<std::string, Value*> > Input;
2719 std::vector<std::pair<std::string, Value*> > Output;
2720 std::string Clobber;
2721 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2722 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2723 E = Constraints.end(); I != E; ++I) {
2724 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2726 InterpretASMConstraint(*I);
2729 assert(0 && "Unknown asm constraint");
2731 case InlineAsm::isInput: {
2733 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2734 ++count; //consume arg
2738 case InlineAsm::isOutput: {
2740 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2741 count ? CI.getOperand(count) : &CI));
2742 ++count; //consume arg
2746 case InlineAsm::isClobber: {
2748 Clobber += ",\"" + c + "\"";
2754 //fix up the asm string for gcc
2755 std::string asmstr = gccifyAsm(as->getAsmString());
2757 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2759 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2760 E = Output.end(); I != E; ++I) {
2761 Out << "\"" << I->first << "\"(";
2762 writeOperandRaw(I->second);
2768 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2769 E = Input.end(); I != E; ++I) {
2770 Out << "\"" << I->first << "\"(";
2771 writeOperandRaw(I->second);
2777 Out << "\n :" << Clobber.substr(1);
2781 void CWriter::visitMallocInst(MallocInst &I) {
2782 assert(0 && "lowerallocations pass didn't work!");
2785 void CWriter::visitAllocaInst(AllocaInst &I) {
2787 printType(Out, I.getType());
2788 Out << ") alloca(sizeof(";
2789 printType(Out, I.getType()->getElementType());
2791 if (I.isArrayAllocation()) {
2793 writeOperand(I.getOperand(0));
2798 void CWriter::visitFreeInst(FreeInst &I) {
2799 assert(0 && "lowerallocations pass didn't work!");
2802 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2803 gep_type_iterator E) {
2804 bool HasImplicitAddress = false;
2805 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2806 if (isa<GlobalValue>(Ptr)) {
2807 HasImplicitAddress = true;
2808 } else if (isDirectAlloca(Ptr)) {
2809 HasImplicitAddress = true;
2813 if (!HasImplicitAddress)
2814 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2816 writeOperandInternal(Ptr);
2820 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2821 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2824 writeOperandInternal(Ptr);
2826 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2828 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2831 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2832 "Can only have implicit address with direct accessing");
2834 if (HasImplicitAddress) {
2836 } else if (CI && CI->isNullValue()) {
2837 gep_type_iterator TmpI = I; ++TmpI;
2839 // Print out the -> operator if possible...
2840 if (TmpI != E && isa<StructType>(*TmpI)) {
2841 Out << (HasImplicitAddress ? "." : "->");
2842 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2848 if (isa<StructType>(*I)) {
2849 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2852 writeOperand(I.getOperand());
2857 void CWriter::visitLoadInst(LoadInst &I) {
2859 if (I.isVolatile()) {
2861 printType(Out, I.getType(), false, "volatile*");
2865 writeOperand(I.getOperand(0));
2871 void CWriter::visitStoreInst(StoreInst &I) {
2873 if (I.isVolatile()) {
2875 printType(Out, I.getOperand(0)->getType(), false, " volatile*");
2878 writeOperand(I.getPointerOperand());
2879 if (I.isVolatile()) Out << ')';
2881 Value *Operand = I.getOperand(0);
2882 Constant *BitMask = 0;
2883 if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
2884 if (!ITy->isPowerOf2ByteWidth())
2885 // We have a bit width that doesn't match an even power-of-2 byte
2886 // size. Consequently we must & the value with the type's bit mask
2887 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
2890 writeOperand(Operand);
2893 printConstant(BitMask);
2898 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2900 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2904 void CWriter::visitVAArgInst(VAArgInst &I) {
2905 Out << "va_arg(*(va_list*)";
2906 writeOperand(I.getOperand(0));
2908 printType(Out, I.getType());
2912 //===----------------------------------------------------------------------===//
2913 // External Interface declaration
2914 //===----------------------------------------------------------------------===//
2916 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2918 CodeGenFileType FileType,
2920 if (FileType != TargetMachine::AssemblyFile) return true;
2922 PM.add(createLowerGCPass());
2923 PM.add(createLowerAllocationsPass(true));
2924 PM.add(createLowerInvokePass());
2925 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2926 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2927 PM.add(new CWriter(o));