1 //===-- CBackend.cpp - Library for converting LLVM code to C --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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/ParamAttrsList.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/Passes.h"
32 #include "llvm/CodeGen/IntrinsicLowering.h"
33 #include "llvm/Transforms/Scalar.h"
34 #include "llvm/Target/TargetMachineRegistry.h"
35 #include "llvm/Target/TargetAsmInfo.h"
36 #include "llvm/Target/TargetData.h"
37 #include "llvm/Support/CallSite.h"
38 #include "llvm/Support/CFG.h"
39 #include "llvm/Support/GetElementPtrTypeIterator.h"
40 #include "llvm/Support/InstVisitor.h"
41 #include "llvm/Support/Mangler.h"
42 #include "llvm/Support/MathExtras.h"
43 #include "llvm/ADT/StringExtras.h"
44 #include "llvm/ADT/STLExtras.h"
45 #include "llvm/Support/MathExtras.h"
46 #include "llvm/Config/config.h"
52 // Register the target.
53 RegisterTarget<CTargetMachine> X("c", " C backend");
55 /// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
56 /// any unnamed structure types that are used by the program, and merges
57 /// external functions with the same name.
59 class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
62 CBackendNameAllUsedStructsAndMergeFunctions()
63 : ModulePass((intptr_t)&ID) {}
64 void getAnalysisUsage(AnalysisUsage &AU) const {
65 AU.addRequired<FindUsedTypes>();
68 virtual const char *getPassName() const {
69 return "C backend type canonicalizer";
72 virtual bool runOnModule(Module &M);
75 char CBackendNameAllUsedStructsAndMergeFunctions::ID = 0;
77 /// CWriter - This class is the main chunk of code that converts an LLVM
78 /// module to a C translation unit.
79 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
81 IntrinsicLowering *IL;
84 const Module *TheModule;
85 const TargetAsmInfo* TAsm;
87 std::map<const Type *, std::string> TypeNames;
88 std::map<const ConstantFP *, unsigned> FPConstantMap;
89 std::set<Function*> intrinsicPrototypesAlreadyGenerated;
90 std::set<const Argument*> ByValParams;
94 CWriter(std::ostream &o)
95 : FunctionPass((intptr_t)&ID), Out(o), IL(0), Mang(0), LI(0),
96 TheModule(0), TAsm(0), TD(0) {}
98 virtual const char *getPassName() const { return "C backend"; }
100 void getAnalysisUsage(AnalysisUsage &AU) const {
101 AU.addRequired<LoopInfo>();
102 AU.setPreservesAll();
105 virtual bool doInitialization(Module &M);
107 bool runOnFunction(Function &F) {
108 LI = &getAnalysis<LoopInfo>();
110 // Get rid of intrinsics we can't handle.
113 // Output all floating point constants that cannot be printed accurately.
114 printFloatingPointConstants(F);
120 virtual bool doFinalization(Module &M) {
123 FPConstantMap.clear();
126 intrinsicPrototypesAlreadyGenerated.clear();
130 std::ostream &printType(std::ostream &Out, const Type *Ty,
131 bool isSigned = false,
132 const std::string &VariableName = "",
133 bool IgnoreName = false,
134 const ParamAttrsList *PAL = 0);
135 std::ostream &printSimpleType(std::ostream &Out, const Type *Ty,
137 const std::string &NameSoFar = "");
139 void printStructReturnPointerFunctionType(std::ostream &Out,
140 const ParamAttrsList *PAL,
141 const PointerType *Ty);
143 /// writeOperandDeref - Print the result of dereferencing the specified
144 /// operand with '*'. This is equivalent to printing '*' then using
145 /// writeOperand, but avoids excess syntax in some cases.
146 void writeOperandDeref(Value *Operand) {
147 if (isAddressExposed(Operand)) {
148 // Already something with an address exposed.
149 writeOperandInternal(Operand);
152 writeOperand(Operand);
157 void writeOperand(Value *Operand);
158 void writeOperandRaw(Value *Operand);
159 void writeOperandInternal(Value *Operand);
160 void writeOperandWithCast(Value* Operand, unsigned Opcode);
161 void writeOperandWithCast(Value* Operand, const ICmpInst &I);
162 bool writeInstructionCast(const Instruction &I);
164 void writeMemoryAccess(Value *Operand, const Type *OperandType,
165 bool IsVolatile, unsigned Alignment);
168 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
170 void lowerIntrinsics(Function &F);
172 void printModule(Module *M);
173 void printModuleTypes(const TypeSymbolTable &ST);
174 void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
175 void printFloatingPointConstants(Function &F);
176 void printFunctionSignature(const Function *F, bool Prototype);
178 void printFunction(Function &);
179 void printBasicBlock(BasicBlock *BB);
180 void printLoop(Loop *L);
182 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
183 void printConstant(Constant *CPV);
184 void printConstantWithCast(Constant *CPV, unsigned Opcode);
185 bool printConstExprCast(const ConstantExpr *CE);
186 void printConstantArray(ConstantArray *CPA);
187 void printConstantVector(ConstantVector *CV);
189 /// isAddressExposed - Return true if the specified value's name needs to
190 /// have its address taken in order to get a C value of the correct type.
191 /// This happens for global variables, byval parameters, and direct allocas.
192 bool isAddressExposed(const Value *V) const {
193 if (const Argument *A = dyn_cast<Argument>(V))
194 return ByValParams.count(A);
195 return isa<GlobalVariable>(V) || isDirectAlloca(V);
198 // isInlinableInst - Attempt to inline instructions into their uses to build
199 // trees as much as possible. To do this, we have to consistently decide
200 // what is acceptable to inline, so that variable declarations don't get
201 // printed and an extra copy of the expr is not emitted.
203 static bool isInlinableInst(const Instruction &I) {
204 // Always inline cmp instructions, even if they are shared by multiple
205 // expressions. GCC generates horrible code if we don't.
209 // Must be an expression, must be used exactly once. If it is dead, we
210 // emit it inline where it would go.
211 if (I.getType() == Type::VoidTy || !I.hasOneUse() ||
212 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
213 isa<LoadInst>(I) || isa<VAArgInst>(I) || isa<InsertElementInst>(I))
214 // Don't inline a load across a store or other bad things!
217 // Must not be used in inline asm, extractelement, or shufflevector.
219 const Instruction &User = cast<Instruction>(*I.use_back());
220 if (isInlineAsm(User) || isa<ExtractElementInst>(User) ||
221 isa<ShuffleVectorInst>(User))
225 // Only inline instruction it if it's use is in the same BB as the inst.
226 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
229 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
230 // variables which are accessed with the & operator. This causes GCC to
231 // generate significantly better code than to emit alloca calls directly.
233 static const AllocaInst *isDirectAlloca(const Value *V) {
234 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
235 if (!AI) return false;
236 if (AI->isArrayAllocation())
237 return 0; // FIXME: we can also inline fixed size array allocas!
238 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
243 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
244 static bool isInlineAsm(const Instruction& I) {
245 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
250 // Instruction visitation functions
251 friend class InstVisitor<CWriter>;
253 void visitReturnInst(ReturnInst &I);
254 void visitBranchInst(BranchInst &I);
255 void visitSwitchInst(SwitchInst &I);
256 void visitInvokeInst(InvokeInst &I) {
257 assert(0 && "Lowerinvoke pass didn't work!");
260 void visitUnwindInst(UnwindInst &I) {
261 assert(0 && "Lowerinvoke pass didn't work!");
263 void visitUnreachableInst(UnreachableInst &I);
265 void visitPHINode(PHINode &I);
266 void visitBinaryOperator(Instruction &I);
267 void visitICmpInst(ICmpInst &I);
268 void visitFCmpInst(FCmpInst &I);
270 void visitCastInst (CastInst &I);
271 void visitSelectInst(SelectInst &I);
272 void visitCallInst (CallInst &I);
273 void visitInlineAsm(CallInst &I);
274 bool visitBuiltinCall(CallInst &I, Intrinsic::ID ID, bool &WroteCallee);
276 void visitMallocInst(MallocInst &I);
277 void visitAllocaInst(AllocaInst &I);
278 void visitFreeInst (FreeInst &I);
279 void visitLoadInst (LoadInst &I);
280 void visitStoreInst (StoreInst &I);
281 void visitGetElementPtrInst(GetElementPtrInst &I);
282 void visitVAArgInst (VAArgInst &I);
284 void visitInsertElementInst(InsertElementInst &I);
285 void visitExtractElementInst(ExtractElementInst &I);
286 void visitShuffleVectorInst(ShuffleVectorInst &SVI);
288 void visitInstruction(Instruction &I) {
289 cerr << "C Writer does not know about " << I;
293 void outputLValue(Instruction *I) {
294 Out << " " << GetValueName(I) << " = ";
297 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
298 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
299 BasicBlock *Successor, unsigned Indent);
300 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
302 void printGEPExpression(Value *Ptr, gep_type_iterator I,
303 gep_type_iterator E);
305 std::string GetValueName(const Value *Operand);
309 char CWriter::ID = 0;
311 /// This method inserts names for any unnamed structure types that are used by
312 /// the program, and removes names from structure types that are not used by the
315 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
316 // Get a set of types that are used by the program...
317 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
319 // Loop over the module symbol table, removing types from UT that are
320 // already named, and removing names for types that are not used.
322 TypeSymbolTable &TST = M.getTypeSymbolTable();
323 for (TypeSymbolTable::iterator TI = TST.begin(), TE = TST.end();
325 TypeSymbolTable::iterator I = TI++;
327 // If this isn't a struct type, remove it from our set of types to name.
328 // This simplifies emission later.
329 if (!isa<StructType>(I->second) && !isa<OpaqueType>(I->second)) {
332 // If this is not used, remove it from the symbol table.
333 std::set<const Type *>::iterator UTI = UT.find(I->second);
337 UT.erase(UTI); // Only keep one name for this type.
341 // UT now contains types that are not named. Loop over it, naming
344 bool Changed = false;
345 unsigned RenameCounter = 0;
346 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
348 if (const StructType *ST = dyn_cast<StructType>(*I)) {
349 while (M.addTypeName("unnamed"+utostr(RenameCounter), ST))
355 // Loop over all external functions and globals. If we have two with
356 // identical names, merge them.
357 // FIXME: This code should disappear when we don't allow values with the same
358 // names when they have different types!
359 std::map<std::string, GlobalValue*> ExtSymbols;
360 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
362 if (GV->isDeclaration() && GV->hasName()) {
363 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
364 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
366 // Found a conflict, replace this global with the previous one.
367 GlobalValue *OldGV = X.first->second;
368 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
369 GV->eraseFromParent();
374 // Do the same for globals.
375 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
377 GlobalVariable *GV = I++;
378 if (GV->isDeclaration() && GV->hasName()) {
379 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
380 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
382 // Found a conflict, replace this global with the previous one.
383 GlobalValue *OldGV = X.first->second;
384 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
385 GV->eraseFromParent();
394 /// printStructReturnPointerFunctionType - This is like printType for a struct
395 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
396 /// print it as "Struct (*)(...)", for struct return functions.
397 void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
398 const ParamAttrsList *PAL,
399 const PointerType *TheTy) {
400 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
401 std::stringstream FunctionInnards;
402 FunctionInnards << " (*) (";
403 bool PrintedType = false;
405 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
406 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
408 for (++I, ++Idx; I != E; ++I, ++Idx) {
410 FunctionInnards << ", ";
411 const Type *ArgTy = *I;
412 if (PAL && PAL->paramHasAttr(Idx, ParamAttr::ByVal)) {
413 assert(isa<PointerType>(ArgTy));
414 ArgTy = cast<PointerType>(ArgTy)->getElementType();
416 printType(FunctionInnards, ArgTy,
417 /*isSigned=*/PAL && PAL->paramHasAttr(Idx, ParamAttr::SExt), "");
420 if (FTy->isVarArg()) {
422 FunctionInnards << ", ...";
423 } else if (!PrintedType) {
424 FunctionInnards << "void";
426 FunctionInnards << ')';
427 std::string tstr = FunctionInnards.str();
428 printType(Out, RetTy,
429 /*isSigned=*/PAL && PAL->paramHasAttr(0, ParamAttr::SExt), tstr);
433 CWriter::printSimpleType(std::ostream &Out, const Type *Ty, bool isSigned,
434 const std::string &NameSoFar) {
435 assert((Ty->isPrimitiveType() || Ty->isInteger() || isa<VectorType>(Ty)) &&
436 "Invalid type for printSimpleType");
437 switch (Ty->getTypeID()) {
438 case Type::VoidTyID: return Out << "void " << NameSoFar;
439 case Type::IntegerTyID: {
440 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
442 return Out << "bool " << NameSoFar;
443 else if (NumBits <= 8)
444 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
445 else if (NumBits <= 16)
446 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
447 else if (NumBits <= 32)
448 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
450 assert(NumBits <= 64 && "Bit widths > 64 not implemented yet");
451 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
454 case Type::FloatTyID: return Out << "float " << NameSoFar;
455 case Type::DoubleTyID: return Out << "double " << NameSoFar;
456 // Lacking emulation of FP80 on PPC, etc., we assume whichever of these is
457 // present matches host 'long double'.
458 case Type::X86_FP80TyID:
459 case Type::PPC_FP128TyID:
460 case Type::FP128TyID: return Out << "long double " << NameSoFar;
462 case Type::VectorTyID: {
463 const VectorType *VTy = cast<VectorType>(Ty);
464 return printSimpleType(Out, VTy->getElementType(), isSigned,
465 " __attribute__((vector_size(" +
466 utostr(TD->getABITypeSize(VTy)) + " ))) " + NameSoFar);
470 cerr << "Unknown primitive type: " << *Ty << "\n";
475 // Pass the Type* and the variable name and this prints out the variable
478 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
479 bool isSigned, const std::string &NameSoFar,
480 bool IgnoreName, const ParamAttrsList* PAL) {
481 if (Ty->isPrimitiveType() || Ty->isInteger() || isa<VectorType>(Ty)) {
482 printSimpleType(Out, Ty, isSigned, NameSoFar);
486 // Check to see if the type is named.
487 if (!IgnoreName || isa<OpaqueType>(Ty)) {
488 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
489 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
492 switch (Ty->getTypeID()) {
493 case Type::FunctionTyID: {
494 const FunctionType *FTy = cast<FunctionType>(Ty);
495 std::stringstream FunctionInnards;
496 FunctionInnards << " (" << NameSoFar << ") (";
498 for (FunctionType::param_iterator I = FTy->param_begin(),
499 E = FTy->param_end(); I != E; ++I) {
500 const Type *ArgTy = *I;
501 if (PAL && PAL->paramHasAttr(Idx, ParamAttr::ByVal)) {
502 assert(isa<PointerType>(ArgTy));
503 ArgTy = cast<PointerType>(ArgTy)->getElementType();
505 if (I != FTy->param_begin())
506 FunctionInnards << ", ";
507 printType(FunctionInnards, ArgTy,
508 /*isSigned=*/PAL && PAL->paramHasAttr(Idx, ParamAttr::SExt), "");
511 if (FTy->isVarArg()) {
512 if (FTy->getNumParams())
513 FunctionInnards << ", ...";
514 } else if (!FTy->getNumParams()) {
515 FunctionInnards << "void";
517 FunctionInnards << ')';
518 std::string tstr = FunctionInnards.str();
519 printType(Out, FTy->getReturnType(),
520 /*isSigned=*/PAL && PAL->paramHasAttr(0, ParamAttr::SExt), tstr);
523 case Type::StructTyID: {
524 const StructType *STy = cast<StructType>(Ty);
525 Out << NameSoFar + " {\n";
527 for (StructType::element_iterator I = STy->element_begin(),
528 E = STy->element_end(); I != E; ++I) {
530 printType(Out, *I, false, "field" + utostr(Idx++));
535 Out << " __attribute__ ((packed))";
539 case Type::PointerTyID: {
540 const PointerType *PTy = cast<PointerType>(Ty);
541 std::string ptrName = "*" + NameSoFar;
543 if (isa<ArrayType>(PTy->getElementType()) ||
544 isa<VectorType>(PTy->getElementType()))
545 ptrName = "(" + ptrName + ")";
548 // Must be a function ptr cast!
549 return printType(Out, PTy->getElementType(), false, ptrName, true, PAL);
550 return printType(Out, PTy->getElementType(), false, ptrName);
553 case Type::ArrayTyID: {
554 const ArrayType *ATy = cast<ArrayType>(Ty);
555 unsigned NumElements = ATy->getNumElements();
556 if (NumElements == 0) NumElements = 1;
557 return printType(Out, ATy->getElementType(), false,
558 NameSoFar + "[" + utostr(NumElements) + "]");
561 case Type::OpaqueTyID: {
562 static int Count = 0;
563 std::string TyName = "struct opaque_" + itostr(Count++);
564 assert(TypeNames.find(Ty) == TypeNames.end());
565 TypeNames[Ty] = TyName;
566 return Out << TyName << ' ' << NameSoFar;
569 assert(0 && "Unhandled case in getTypeProps!");
576 void CWriter::printConstantArray(ConstantArray *CPA) {
578 // As a special case, print the array as a string if it is an array of
579 // ubytes or an array of sbytes with positive values.
581 const Type *ETy = CPA->getType()->getElementType();
582 bool isString = (ETy == Type::Int8Ty || ETy == Type::Int8Ty);
584 // Make sure the last character is a null char, as automatically added by C
585 if (isString && (CPA->getNumOperands() == 0 ||
586 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
591 // Keep track of whether the last number was a hexadecimal escape
592 bool LastWasHex = false;
594 // Do not include the last character, which we know is null
595 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
596 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
598 // Print it out literally if it is a printable character. The only thing
599 // to be careful about is when the last letter output was a hex escape
600 // code, in which case we have to be careful not to print out hex digits
601 // explicitly (the C compiler thinks it is a continuation of the previous
602 // character, sheesh...)
604 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
606 if (C == '"' || C == '\\')
613 case '\n': Out << "\\n"; break;
614 case '\t': Out << "\\t"; break;
615 case '\r': Out << "\\r"; break;
616 case '\v': Out << "\\v"; break;
617 case '\a': Out << "\\a"; break;
618 case '\"': Out << "\\\""; break;
619 case '\'': Out << "\\\'"; break;
622 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
623 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
632 if (CPA->getNumOperands()) {
634 printConstant(cast<Constant>(CPA->getOperand(0)));
635 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
637 printConstant(cast<Constant>(CPA->getOperand(i)));
644 void CWriter::printConstantVector(ConstantVector *CP) {
646 if (CP->getNumOperands()) {
648 printConstant(cast<Constant>(CP->getOperand(0)));
649 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
651 printConstant(cast<Constant>(CP->getOperand(i)));
657 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
658 // textually as a double (rather than as a reference to a stack-allocated
659 // variable). We decide this by converting CFP to a string and back into a
660 // double, and then checking whether the conversion results in a bit-equal
661 // double to the original value of CFP. This depends on us and the target C
662 // compiler agreeing on the conversion process (which is pretty likely since we
663 // only deal in IEEE FP).
665 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
666 // Do long doubles in hex for now.
667 if (CFP->getType()!=Type::FloatTy && CFP->getType()!=Type::DoubleTy)
669 APFloat APF = APFloat(CFP->getValueAPF()); // copy
670 if (CFP->getType()==Type::FloatTy)
671 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven);
672 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
674 sprintf(Buffer, "%a", APF.convertToDouble());
675 if (!strncmp(Buffer, "0x", 2) ||
676 !strncmp(Buffer, "-0x", 3) ||
677 !strncmp(Buffer, "+0x", 3))
678 return APF.bitwiseIsEqual(APFloat(atof(Buffer)));
681 std::string StrVal = ftostr(APF);
683 while (StrVal[0] == ' ')
684 StrVal.erase(StrVal.begin());
686 // Check to make sure that the stringized number is not some string like "Inf"
687 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
688 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
689 ((StrVal[0] == '-' || StrVal[0] == '+') &&
690 (StrVal[1] >= '0' && StrVal[1] <= '9')))
691 // Reparse stringized version!
692 return APF.bitwiseIsEqual(APFloat(atof(StrVal.c_str())));
697 /// Print out the casting for a cast operation. This does the double casting
698 /// necessary for conversion to the destination type, if necessary.
699 /// @brief Print a cast
700 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
701 // Print the destination type cast
703 case Instruction::UIToFP:
704 case Instruction::SIToFP:
705 case Instruction::IntToPtr:
706 case Instruction::Trunc:
707 case Instruction::BitCast:
708 case Instruction::FPExt:
709 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
711 printType(Out, DstTy);
714 case Instruction::ZExt:
715 case Instruction::PtrToInt:
716 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
718 printSimpleType(Out, DstTy, false);
721 case Instruction::SExt:
722 case Instruction::FPToSI: // For these, make sure we get a signed dest
724 printSimpleType(Out, DstTy, true);
728 assert(0 && "Invalid cast opcode");
731 // Print the source type cast
733 case Instruction::UIToFP:
734 case Instruction::ZExt:
736 printSimpleType(Out, SrcTy, false);
739 case Instruction::SIToFP:
740 case Instruction::SExt:
742 printSimpleType(Out, SrcTy, true);
745 case Instruction::IntToPtr:
746 case Instruction::PtrToInt:
747 // Avoid "cast to pointer from integer of different size" warnings
748 Out << "(unsigned long)";
750 case Instruction::Trunc:
751 case Instruction::BitCast:
752 case Instruction::FPExt:
753 case Instruction::FPTrunc:
754 case Instruction::FPToSI:
755 case Instruction::FPToUI:
756 break; // These don't need a source cast.
758 assert(0 && "Invalid cast opcode");
763 // printConstant - The LLVM Constant to C Constant converter.
764 void CWriter::printConstant(Constant *CPV) {
765 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
766 switch (CE->getOpcode()) {
767 case Instruction::Trunc:
768 case Instruction::ZExt:
769 case Instruction::SExt:
770 case Instruction::FPTrunc:
771 case Instruction::FPExt:
772 case Instruction::UIToFP:
773 case Instruction::SIToFP:
774 case Instruction::FPToUI:
775 case Instruction::FPToSI:
776 case Instruction::PtrToInt:
777 case Instruction::IntToPtr:
778 case Instruction::BitCast:
780 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
781 if (CE->getOpcode() == Instruction::SExt &&
782 CE->getOperand(0)->getType() == Type::Int1Ty) {
783 // Make sure we really sext from bool here by subtracting from 0
786 printConstant(CE->getOperand(0));
787 if (CE->getType() == Type::Int1Ty &&
788 (CE->getOpcode() == Instruction::Trunc ||
789 CE->getOpcode() == Instruction::FPToUI ||
790 CE->getOpcode() == Instruction::FPToSI ||
791 CE->getOpcode() == Instruction::PtrToInt)) {
792 // Make sure we really truncate to bool here by anding with 1
798 case Instruction::GetElementPtr:
800 printGEPExpression(CE->getOperand(0), gep_type_begin(CPV),
804 case Instruction::Select:
806 printConstant(CE->getOperand(0));
808 printConstant(CE->getOperand(1));
810 printConstant(CE->getOperand(2));
813 case Instruction::Add:
814 case Instruction::Sub:
815 case Instruction::Mul:
816 case Instruction::SDiv:
817 case Instruction::UDiv:
818 case Instruction::FDiv:
819 case Instruction::URem:
820 case Instruction::SRem:
821 case Instruction::FRem:
822 case Instruction::And:
823 case Instruction::Or:
824 case Instruction::Xor:
825 case Instruction::ICmp:
826 case Instruction::Shl:
827 case Instruction::LShr:
828 case Instruction::AShr:
831 bool NeedsClosingParens = printConstExprCast(CE);
832 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
833 switch (CE->getOpcode()) {
834 case Instruction::Add: Out << " + "; break;
835 case Instruction::Sub: Out << " - "; break;
836 case Instruction::Mul: Out << " * "; break;
837 case Instruction::URem:
838 case Instruction::SRem:
839 case Instruction::FRem: Out << " % "; break;
840 case Instruction::UDiv:
841 case Instruction::SDiv:
842 case Instruction::FDiv: Out << " / "; break;
843 case Instruction::And: Out << " & "; break;
844 case Instruction::Or: Out << " | "; break;
845 case Instruction::Xor: Out << " ^ "; break;
846 case Instruction::Shl: Out << " << "; break;
847 case Instruction::LShr:
848 case Instruction::AShr: Out << " >> "; break;
849 case Instruction::ICmp:
850 switch (CE->getPredicate()) {
851 case ICmpInst::ICMP_EQ: Out << " == "; break;
852 case ICmpInst::ICMP_NE: Out << " != "; break;
853 case ICmpInst::ICMP_SLT:
854 case ICmpInst::ICMP_ULT: Out << " < "; break;
855 case ICmpInst::ICMP_SLE:
856 case ICmpInst::ICMP_ULE: Out << " <= "; break;
857 case ICmpInst::ICMP_SGT:
858 case ICmpInst::ICMP_UGT: Out << " > "; break;
859 case ICmpInst::ICMP_SGE:
860 case ICmpInst::ICMP_UGE: Out << " >= "; break;
861 default: assert(0 && "Illegal ICmp predicate");
864 default: assert(0 && "Illegal opcode here!");
866 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
867 if (NeedsClosingParens)
872 case Instruction::FCmp: {
874 bool NeedsClosingParens = printConstExprCast(CE);
875 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
877 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
881 switch (CE->getPredicate()) {
882 default: assert(0 && "Illegal FCmp predicate");
883 case FCmpInst::FCMP_ORD: op = "ord"; break;
884 case FCmpInst::FCMP_UNO: op = "uno"; break;
885 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
886 case FCmpInst::FCMP_UNE: op = "une"; break;
887 case FCmpInst::FCMP_ULT: op = "ult"; break;
888 case FCmpInst::FCMP_ULE: op = "ule"; break;
889 case FCmpInst::FCMP_UGT: op = "ugt"; break;
890 case FCmpInst::FCMP_UGE: op = "uge"; break;
891 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
892 case FCmpInst::FCMP_ONE: op = "one"; break;
893 case FCmpInst::FCMP_OLT: op = "olt"; break;
894 case FCmpInst::FCMP_OLE: op = "ole"; break;
895 case FCmpInst::FCMP_OGT: op = "ogt"; break;
896 case FCmpInst::FCMP_OGE: op = "oge"; break;
898 Out << "llvm_fcmp_" << op << "(";
899 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
901 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
904 if (NeedsClosingParens)
910 cerr << "CWriter Error: Unhandled constant expression: "
914 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
916 printType(Out, CPV->getType()); // sign doesn't matter
918 if (!isa<VectorType>(CPV->getType())) {
926 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
927 const Type* Ty = CI->getType();
928 if (Ty == Type::Int1Ty)
929 Out << (CI->getZExtValue() ? '1' : '0');
930 else if (Ty == Type::Int32Ty)
931 Out << CI->getZExtValue() << 'u';
932 else if (Ty->getPrimitiveSizeInBits() > 32)
933 Out << CI->getZExtValue() << "ull";
936 printSimpleType(Out, Ty, false) << ')';
937 if (CI->isMinValue(true))
938 Out << CI->getZExtValue() << 'u';
940 Out << CI->getSExtValue();
946 switch (CPV->getType()->getTypeID()) {
947 case Type::FloatTyID:
948 case Type::DoubleTyID:
949 case Type::X86_FP80TyID:
950 case Type::PPC_FP128TyID:
951 case Type::FP128TyID: {
952 ConstantFP *FPC = cast<ConstantFP>(CPV);
953 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
954 if (I != FPConstantMap.end()) {
955 // Because of FP precision problems we must load from a stack allocated
956 // value that holds the value in hex.
957 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" :
958 FPC->getType() == Type::DoubleTy ? "double" :
960 << "*)&FPConstant" << I->second << ')';
962 assert(FPC->getType() == Type::FloatTy ||
963 FPC->getType() == Type::DoubleTy);
964 double V = FPC->getType() == Type::FloatTy ?
965 FPC->getValueAPF().convertToFloat() :
966 FPC->getValueAPF().convertToDouble();
970 // FIXME the actual NaN bits should be emitted.
971 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
973 const unsigned long QuietNaN = 0x7ff8UL;
974 //const unsigned long SignalNaN = 0x7ff4UL;
976 // We need to grab the first part of the FP #
979 uint64_t ll = DoubleToBits(V);
980 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
982 std::string Num(&Buffer[0], &Buffer[6]);
983 unsigned long Val = strtoul(Num.c_str(), 0, 16);
985 if (FPC->getType() == Type::FloatTy)
986 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
987 << Buffer << "\") /*nan*/ ";
989 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
990 << Buffer << "\") /*nan*/ ";
991 } else if (IsInf(V)) {
993 if (V < 0) Out << '-';
994 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
998 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
999 // Print out the constant as a floating point number.
1001 sprintf(Buffer, "%a", V);
1004 Num = ftostr(FPC->getValueAPF());
1012 case Type::ArrayTyID:
1013 if (ConstantArray *CA = dyn_cast<ConstantArray>(CPV)) {
1014 printConstantArray(CA);
1016 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1017 const ArrayType *AT = cast<ArrayType>(CPV->getType());
1019 if (AT->getNumElements()) {
1021 Constant *CZ = Constant::getNullValue(AT->getElementType());
1023 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
1032 case Type::VectorTyID:
1033 // Use C99 compound expression literal initializer syntax.
1035 printType(Out, CPV->getType());
1037 if (ConstantVector *CV = dyn_cast<ConstantVector>(CPV)) {
1038 printConstantVector(CV);
1040 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1041 const VectorType *VT = cast<VectorType>(CPV->getType());
1043 Constant *CZ = Constant::getNullValue(VT->getElementType());
1045 for (unsigned i = 1, e = VT->getNumElements(); i != e; ++i) {
1053 case Type::StructTyID:
1054 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
1055 const StructType *ST = cast<StructType>(CPV->getType());
1057 if (ST->getNumElements()) {
1059 printConstant(Constant::getNullValue(ST->getElementType(0)));
1060 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
1062 printConstant(Constant::getNullValue(ST->getElementType(i)));
1068 if (CPV->getNumOperands()) {
1070 printConstant(cast<Constant>(CPV->getOperand(0)));
1071 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
1073 printConstant(cast<Constant>(CPV->getOperand(i)));
1080 case Type::PointerTyID:
1081 if (isa<ConstantPointerNull>(CPV)) {
1083 printType(Out, CPV->getType()); // sign doesn't matter
1084 Out << ")/*NULL*/0)";
1086 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
1092 cerr << "Unknown constant type: " << *CPV << "\n";
1097 // Some constant expressions need to be casted back to the original types
1098 // because their operands were casted to the expected type. This function takes
1099 // care of detecting that case and printing the cast for the ConstantExpr.
1100 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
1101 bool NeedsExplicitCast = false;
1102 const Type *Ty = CE->getOperand(0)->getType();
1103 bool TypeIsSigned = false;
1104 switch (CE->getOpcode()) {
1105 case Instruction::LShr:
1106 case Instruction::URem:
1107 case Instruction::UDiv: NeedsExplicitCast = true; break;
1108 case Instruction::AShr:
1109 case Instruction::SRem:
1110 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1111 case Instruction::SExt:
1113 NeedsExplicitCast = true;
1114 TypeIsSigned = true;
1116 case Instruction::ZExt:
1117 case Instruction::Trunc:
1118 case Instruction::FPTrunc:
1119 case Instruction::FPExt:
1120 case Instruction::UIToFP:
1121 case Instruction::SIToFP:
1122 case Instruction::FPToUI:
1123 case Instruction::FPToSI:
1124 case Instruction::PtrToInt:
1125 case Instruction::IntToPtr:
1126 case Instruction::BitCast:
1128 NeedsExplicitCast = true;
1132 if (NeedsExplicitCast) {
1134 if (Ty->isInteger() && Ty != Type::Int1Ty)
1135 printSimpleType(Out, Ty, TypeIsSigned);
1137 printType(Out, Ty); // not integer, sign doesn't matter
1140 return NeedsExplicitCast;
1143 // Print a constant assuming that it is the operand for a given Opcode. The
1144 // opcodes that care about sign need to cast their operands to the expected
1145 // type before the operation proceeds. This function does the casting.
1146 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1148 // Extract the operand's type, we'll need it.
1149 const Type* OpTy = CPV->getType();
1151 // Indicate whether to do the cast or not.
1152 bool shouldCast = false;
1153 bool typeIsSigned = false;
1155 // Based on the Opcode for which this Constant is being written, determine
1156 // the new type to which the operand should be casted by setting the value
1157 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1161 // for most instructions, it doesn't matter
1163 case Instruction::LShr:
1164 case Instruction::UDiv:
1165 case Instruction::URem:
1168 case Instruction::AShr:
1169 case Instruction::SDiv:
1170 case Instruction::SRem:
1172 typeIsSigned = true;
1176 // Write out the casted constant if we should, otherwise just write the
1180 printSimpleType(Out, OpTy, typeIsSigned);
1188 std::string CWriter::GetValueName(const Value *Operand) {
1191 if (!isa<GlobalValue>(Operand) && Operand->getName() != "") {
1192 std::string VarName;
1194 Name = Operand->getName();
1195 VarName.reserve(Name.capacity());
1197 for (std::string::iterator I = Name.begin(), E = Name.end();
1201 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1202 (ch >= '0' && ch <= '9') || ch == '_')) {
1204 sprintf(buffer, "_%x_", ch);
1210 Name = "llvm_cbe_" + VarName;
1212 Name = Mang->getValueName(Operand);
1218 void CWriter::writeOperandInternal(Value *Operand) {
1219 if (Instruction *I = dyn_cast<Instruction>(Operand))
1220 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1221 // Should we inline this instruction to build a tree?
1228 Constant* CPV = dyn_cast<Constant>(Operand);
1230 if (CPV && !isa<GlobalValue>(CPV))
1233 Out << GetValueName(Operand);
1236 void CWriter::writeOperandRaw(Value *Operand) {
1237 Constant* CPV = dyn_cast<Constant>(Operand);
1238 if (CPV && !isa<GlobalValue>(CPV)) {
1241 Out << GetValueName(Operand);
1245 void CWriter::writeOperand(Value *Operand) {
1246 bool isAddressImplicit = isAddressExposed(Operand);
1247 if (isAddressImplicit)
1248 Out << "(&"; // Global variables are referenced as their addresses by llvm
1250 writeOperandInternal(Operand);
1252 if (isAddressImplicit)
1256 // Some instructions need to have their result value casted back to the
1257 // original types because their operands were casted to the expected type.
1258 // This function takes care of detecting that case and printing the cast
1259 // for the Instruction.
1260 bool CWriter::writeInstructionCast(const Instruction &I) {
1261 const Type *Ty = I.getOperand(0)->getType();
1262 switch (I.getOpcode()) {
1263 case Instruction::LShr:
1264 case Instruction::URem:
1265 case Instruction::UDiv:
1267 printSimpleType(Out, Ty, false);
1270 case Instruction::AShr:
1271 case Instruction::SRem:
1272 case Instruction::SDiv:
1274 printSimpleType(Out, Ty, true);
1282 // Write the operand with a cast to another type based on the Opcode being used.
1283 // This will be used in cases where an instruction has specific type
1284 // requirements (usually signedness) for its operands.
1285 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1287 // Extract the operand's type, we'll need it.
1288 const Type* OpTy = Operand->getType();
1290 // Indicate whether to do the cast or not.
1291 bool shouldCast = false;
1293 // Indicate whether the cast should be to a signed type or not.
1294 bool castIsSigned = false;
1296 // Based on the Opcode for which this Operand is being written, determine
1297 // the new type to which the operand should be casted by setting the value
1298 // of OpTy. If we change OpTy, also set shouldCast to true.
1301 // for most instructions, it doesn't matter
1303 case Instruction::LShr:
1304 case Instruction::UDiv:
1305 case Instruction::URem: // Cast to unsigned first
1307 castIsSigned = false;
1309 case Instruction::GetElementPtr:
1310 case Instruction::AShr:
1311 case Instruction::SDiv:
1312 case Instruction::SRem: // Cast to signed first
1314 castIsSigned = true;
1318 // Write out the casted operand if we should, otherwise just write the
1322 printSimpleType(Out, OpTy, castIsSigned);
1324 writeOperand(Operand);
1327 writeOperand(Operand);
1330 // Write the operand with a cast to another type based on the icmp predicate
1332 void CWriter::writeOperandWithCast(Value* Operand, const ICmpInst &Cmp) {
1333 // This has to do a cast to ensure the operand has the right signedness.
1334 // Also, if the operand is a pointer, we make sure to cast to an integer when
1335 // doing the comparison both for signedness and so that the C compiler doesn't
1336 // optimize things like "p < NULL" to false (p may contain an integer value
1338 bool shouldCast = Cmp.isRelational();
1340 // Write out the casted operand if we should, otherwise just write the
1343 writeOperand(Operand);
1347 // Should this be a signed comparison? If so, convert to signed.
1348 bool castIsSigned = Cmp.isSignedPredicate();
1350 // If the operand was a pointer, convert to a large integer type.
1351 const Type* OpTy = Operand->getType();
1352 if (isa<PointerType>(OpTy))
1353 OpTy = TD->getIntPtrType();
1356 printSimpleType(Out, OpTy, castIsSigned);
1358 writeOperand(Operand);
1362 // generateCompilerSpecificCode - This is where we add conditional compilation
1363 // directives to cater to specific compilers as need be.
1365 static void generateCompilerSpecificCode(std::ostream& Out) {
1366 // Alloca is hard to get, and we don't want to include stdlib.h here.
1367 Out << "/* get a declaration for alloca */\n"
1368 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1369 << "#define alloca(x) __builtin_alloca((x))\n"
1370 << "#define _alloca(x) __builtin_alloca((x))\n"
1371 << "#elif defined(__APPLE__)\n"
1372 << "extern void *__builtin_alloca(unsigned long);\n"
1373 << "#define alloca(x) __builtin_alloca(x)\n"
1374 << "#define longjmp _longjmp\n"
1375 << "#define setjmp _setjmp\n"
1376 << "#elif defined(__sun__)\n"
1377 << "#if defined(__sparcv9)\n"
1378 << "extern void *__builtin_alloca(unsigned long);\n"
1380 << "extern void *__builtin_alloca(unsigned int);\n"
1382 << "#define alloca(x) __builtin_alloca(x)\n"
1383 << "#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)\n"
1384 << "#define alloca(x) __builtin_alloca(x)\n"
1385 << "#elif defined(_MSC_VER)\n"
1386 << "#define inline _inline\n"
1387 << "#define alloca(x) _alloca(x)\n"
1389 << "#include <alloca.h>\n"
1392 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1393 // If we aren't being compiled with GCC, just drop these attributes.
1394 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1395 << "#define __attribute__(X)\n"
1398 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1399 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1400 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1401 << "#elif defined(__GNUC__)\n"
1402 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1404 << "#define __EXTERNAL_WEAK__\n"
1407 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1408 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1409 << "#define __ATTRIBUTE_WEAK__\n"
1410 << "#elif defined(__GNUC__)\n"
1411 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1413 << "#define __ATTRIBUTE_WEAK__\n"
1416 // Add hidden visibility support. FIXME: APPLE_CC?
1417 Out << "#if defined(__GNUC__)\n"
1418 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1421 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1422 // From the GCC documentation:
1424 // double __builtin_nan (const char *str)
1426 // This is an implementation of the ISO C99 function nan.
1428 // Since ISO C99 defines this function in terms of strtod, which we do
1429 // not implement, a description of the parsing is in order. The string is
1430 // parsed as by strtol; that is, the base is recognized by leading 0 or
1431 // 0x prefixes. The number parsed is placed in the significand such that
1432 // the least significant bit of the number is at the least significant
1433 // bit of the significand. The number is truncated to fit the significand
1434 // field provided. The significand is forced to be a quiet NaN.
1436 // This function, if given a string literal, is evaluated early enough
1437 // that it is considered a compile-time constant.
1439 // float __builtin_nanf (const char *str)
1441 // Similar to __builtin_nan, except the return type is float.
1443 // double __builtin_inf (void)
1445 // Similar to __builtin_huge_val, except a warning is generated if the
1446 // target floating-point format does not support infinities. This
1447 // function is suitable for implementing the ISO C99 macro INFINITY.
1449 // float __builtin_inff (void)
1451 // Similar to __builtin_inf, except the return type is float.
1452 Out << "#ifdef __GNUC__\n"
1453 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1454 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1455 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1456 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1457 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1458 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1459 << "#define LLVM_PREFETCH(addr,rw,locality) "
1460 "__builtin_prefetch(addr,rw,locality)\n"
1461 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1462 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1463 << "#define LLVM_ASM __asm__\n"
1465 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1466 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1467 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1468 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1469 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1470 << "#define LLVM_INFF 0.0F /* Float */\n"
1471 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1472 << "#define __ATTRIBUTE_CTOR__\n"
1473 << "#define __ATTRIBUTE_DTOR__\n"
1474 << "#define LLVM_ASM(X)\n"
1477 Out << "#if __GNUC__ < 4 /* Old GCC's, or compilers not GCC */ \n"
1478 << "#define __builtin_stack_save() 0 /* not implemented */\n"
1479 << "#define __builtin_stack_restore(X) /* noop */\n"
1482 // Output target-specific code that should be inserted into main.
1483 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1486 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1487 /// the StaticTors set.
1488 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1489 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1490 if (!InitList) return;
1492 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1493 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1494 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1496 if (CS->getOperand(1)->isNullValue())
1497 return; // Found a null terminator, exit printing.
1498 Constant *FP = CS->getOperand(1);
1499 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1501 FP = CE->getOperand(0);
1502 if (Function *F = dyn_cast<Function>(FP))
1503 StaticTors.insert(F);
1507 enum SpecialGlobalClass {
1509 GlobalCtors, GlobalDtors,
1513 /// getGlobalVariableClass - If this is a global that is specially recognized
1514 /// by LLVM, return a code that indicates how we should handle it.
1515 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1516 // If this is a global ctors/dtors list, handle it now.
1517 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1518 if (GV->getName() == "llvm.global_ctors")
1520 else if (GV->getName() == "llvm.global_dtors")
1524 // Otherwise, it it is other metadata, don't print it. This catches things
1525 // like debug information.
1526 if (GV->getSection() == "llvm.metadata")
1533 bool CWriter::doInitialization(Module &M) {
1537 TD = new TargetData(&M);
1538 IL = new IntrinsicLowering(*TD);
1539 IL->AddPrototypes(M);
1541 // Ensure that all structure types have names...
1542 Mang = new Mangler(M);
1543 Mang->markCharUnacceptable('.');
1545 // Keep track of which functions are static ctors/dtors so they can have
1546 // an attribute added to their prototypes.
1547 std::set<Function*> StaticCtors, StaticDtors;
1548 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1550 switch (getGlobalVariableClass(I)) {
1553 FindStaticTors(I, StaticCtors);
1556 FindStaticTors(I, StaticDtors);
1561 // get declaration for alloca
1562 Out << "/* Provide Declarations */\n";
1563 Out << "#include <stdarg.h>\n"; // Varargs support
1564 Out << "#include <setjmp.h>\n"; // Unwind support
1565 generateCompilerSpecificCode(Out);
1567 // Provide a definition for `bool' if not compiling with a C++ compiler.
1569 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1571 << "\n\n/* Support for floating point constants */\n"
1572 << "typedef unsigned long long ConstantDoubleTy;\n"
1573 << "typedef unsigned int ConstantFloatTy;\n"
1574 << "typedef struct { unsigned long long f1; unsigned short f2; "
1575 "unsigned short pad[3]; } ConstantFP80Ty;\n"
1576 // This is used for both kinds of 128-bit long double; meaning differs.
1577 << "typedef struct { unsigned long long f1; unsigned long long f2; }"
1578 " ConstantFP128Ty;\n"
1579 << "\n\n/* Global Declarations */\n";
1581 // First output all the declarations for the program, because C requires
1582 // Functions & globals to be declared before they are used.
1585 // Loop over the symbol table, emitting all named constants...
1586 printModuleTypes(M.getTypeSymbolTable());
1588 // Global variable declarations...
1589 if (!M.global_empty()) {
1590 Out << "\n/* External Global Variable Declarations */\n";
1591 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1594 if (I->hasExternalLinkage() || I->hasExternalWeakLinkage())
1596 else if (I->hasDLLImportLinkage())
1597 Out << "__declspec(dllimport) ";
1599 continue; // Internal Global
1601 // Thread Local Storage
1602 if (I->isThreadLocal())
1605 printType(Out, I->getType()->getElementType(), false, GetValueName(I));
1607 if (I->hasExternalWeakLinkage())
1608 Out << " __EXTERNAL_WEAK__";
1613 // Function declarations
1614 Out << "\n/* Function Declarations */\n";
1615 Out << "double fmod(double, double);\n"; // Support for FP rem
1616 Out << "float fmodf(float, float);\n";
1617 Out << "long double fmodl(long double, long double);\n";
1619 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1620 // Don't print declarations for intrinsic functions.
1621 if (!I->isIntrinsic() && I->getName() != "setjmp" &&
1622 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1623 if (I->hasExternalWeakLinkage())
1625 printFunctionSignature(I, true);
1626 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1627 Out << " __ATTRIBUTE_WEAK__";
1628 if (I->hasExternalWeakLinkage())
1629 Out << " __EXTERNAL_WEAK__";
1630 if (StaticCtors.count(I))
1631 Out << " __ATTRIBUTE_CTOR__";
1632 if (StaticDtors.count(I))
1633 Out << " __ATTRIBUTE_DTOR__";
1634 if (I->hasHiddenVisibility())
1635 Out << " __HIDDEN__";
1637 if (I->hasName() && I->getName()[0] == 1)
1638 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1644 // Output the global variable declarations
1645 if (!M.global_empty()) {
1646 Out << "\n\n/* Global Variable Declarations */\n";
1647 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1649 if (!I->isDeclaration()) {
1650 // Ignore special globals, such as debug info.
1651 if (getGlobalVariableClass(I))
1654 if (I->hasInternalLinkage())
1659 // Thread Local Storage
1660 if (I->isThreadLocal())
1663 printType(Out, I->getType()->getElementType(), false,
1666 if (I->hasLinkOnceLinkage())
1667 Out << " __attribute__((common))";
1668 else if (I->hasWeakLinkage())
1669 Out << " __ATTRIBUTE_WEAK__";
1670 else if (I->hasExternalWeakLinkage())
1671 Out << " __EXTERNAL_WEAK__";
1672 if (I->hasHiddenVisibility())
1673 Out << " __HIDDEN__";
1678 // Output the global variable definitions and contents...
1679 if (!M.global_empty()) {
1680 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1681 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1683 if (!I->isDeclaration()) {
1684 // Ignore special globals, such as debug info.
1685 if (getGlobalVariableClass(I))
1688 if (I->hasInternalLinkage())
1690 else if (I->hasDLLImportLinkage())
1691 Out << "__declspec(dllimport) ";
1692 else if (I->hasDLLExportLinkage())
1693 Out << "__declspec(dllexport) ";
1695 // Thread Local Storage
1696 if (I->isThreadLocal())
1699 printType(Out, I->getType()->getElementType(), false,
1701 if (I->hasLinkOnceLinkage())
1702 Out << " __attribute__((common))";
1703 else if (I->hasWeakLinkage())
1704 Out << " __ATTRIBUTE_WEAK__";
1706 if (I->hasHiddenVisibility())
1707 Out << " __HIDDEN__";
1709 // If the initializer is not null, emit the initializer. If it is null,
1710 // we try to avoid emitting large amounts of zeros. The problem with
1711 // this, however, occurs when the variable has weak linkage. In this
1712 // case, the assembler will complain about the variable being both weak
1713 // and common, so we disable this optimization.
1714 if (!I->getInitializer()->isNullValue()) {
1716 writeOperand(I->getInitializer());
1717 } else if (I->hasWeakLinkage()) {
1718 // We have to specify an initializer, but it doesn't have to be
1719 // complete. If the value is an aggregate, print out { 0 }, and let
1720 // the compiler figure out the rest of the zeros.
1722 if (isa<StructType>(I->getInitializer()->getType()) ||
1723 isa<ArrayType>(I->getInitializer()->getType()) ||
1724 isa<VectorType>(I->getInitializer()->getType())) {
1727 // Just print it out normally.
1728 writeOperand(I->getInitializer());
1736 Out << "\n\n/* Function Bodies */\n";
1738 // Emit some helper functions for dealing with FCMP instruction's
1740 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1741 Out << "return X == X && Y == Y; }\n";
1742 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1743 Out << "return X != X || Y != Y; }\n";
1744 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1745 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1746 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1747 Out << "return X != Y; }\n";
1748 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1749 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1750 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1751 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1752 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1753 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1754 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1755 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1756 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1757 Out << "return X == Y ; }\n";
1758 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1759 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1760 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1761 Out << "return X < Y ; }\n";
1762 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1763 Out << "return X > Y ; }\n";
1764 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1765 Out << "return X <= Y ; }\n";
1766 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1767 Out << "return X >= Y ; }\n";
1772 /// Output all floating point constants that cannot be printed accurately...
1773 void CWriter::printFloatingPointConstants(Function &F) {
1774 // Scan the module for floating point constants. If any FP constant is used
1775 // in the function, we want to redirect it here so that we do not depend on
1776 // the precision of the printed form, unless the printed form preserves
1779 static unsigned FPCounter = 0;
1780 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1782 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1783 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1784 !FPConstantMap.count(FPC)) {
1785 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1787 if (FPC->getType() == Type::DoubleTy) {
1788 double Val = FPC->getValueAPF().convertToDouble();
1789 uint64_t i = FPC->getValueAPF().convertToAPInt().getZExtValue();
1790 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1791 << " = 0x" << std::hex << i << std::dec
1792 << "ULL; /* " << Val << " */\n";
1793 } else if (FPC->getType() == Type::FloatTy) {
1794 float Val = FPC->getValueAPF().convertToFloat();
1795 uint32_t i = (uint32_t)FPC->getValueAPF().convertToAPInt().
1797 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1798 << " = 0x" << std::hex << i << std::dec
1799 << "U; /* " << Val << " */\n";
1800 } else if (FPC->getType() == Type::X86_FP80Ty) {
1801 // api needed to prevent premature destruction
1802 APInt api = FPC->getValueAPF().convertToAPInt();
1803 const uint64_t *p = api.getRawData();
1804 Out << "static const ConstantFP80Ty FPConstant" << FPCounter++
1805 << " = { 0x" << std::hex
1806 << ((uint16_t)p[1] | (p[0] & 0xffffffffffffLL)<<16)
1807 << ", 0x" << (uint16_t)(p[0] >> 48) << ",0,0,0"
1808 << "}; /* Long double constant */\n" << std::dec;
1809 } else if (FPC->getType() == Type::PPC_FP128Ty) {
1810 APInt api = FPC->getValueAPF().convertToAPInt();
1811 const uint64_t *p = api.getRawData();
1812 Out << "static const ConstantFP128Ty FPConstant" << FPCounter++
1813 << " = { 0x" << std::hex
1814 << p[0] << ", 0x" << p[1]
1815 << "}; /* Long double constant */\n" << std::dec;
1818 assert(0 && "Unknown float type!");
1825 /// printSymbolTable - Run through symbol table looking for type names. If a
1826 /// type name is found, emit its declaration...
1828 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1829 Out << "/* Helper union for bitcasts */\n";
1830 Out << "typedef union {\n";
1831 Out << " unsigned int Int32;\n";
1832 Out << " unsigned long long Int64;\n";
1833 Out << " float Float;\n";
1834 Out << " double Double;\n";
1835 Out << "} llvmBitCastUnion;\n";
1837 // We are only interested in the type plane of the symbol table.
1838 TypeSymbolTable::const_iterator I = TST.begin();
1839 TypeSymbolTable::const_iterator End = TST.end();
1841 // If there are no type names, exit early.
1842 if (I == End) return;
1844 // Print out forward declarations for structure types before anything else!
1845 Out << "/* Structure forward decls */\n";
1846 for (; I != End; ++I) {
1847 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1848 Out << Name << ";\n";
1849 TypeNames.insert(std::make_pair(I->second, Name));
1854 // Now we can print out typedefs. Above, we guaranteed that this can only be
1855 // for struct or opaque types.
1856 Out << "/* Typedefs */\n";
1857 for (I = TST.begin(); I != End; ++I) {
1858 std::string Name = "l_" + Mang->makeNameProper(I->first);
1860 printType(Out, I->second, false, Name);
1866 // Keep track of which structures have been printed so far...
1867 std::set<const StructType *> StructPrinted;
1869 // Loop over all structures then push them into the stack so they are
1870 // printed in the correct order.
1872 Out << "/* Structure contents */\n";
1873 for (I = TST.begin(); I != End; ++I)
1874 if (const StructType *STy = dyn_cast<StructType>(I->second))
1875 // Only print out used types!
1876 printContainedStructs(STy, StructPrinted);
1879 // Push the struct onto the stack and recursively push all structs
1880 // this one depends on.
1882 // TODO: Make this work properly with vector types
1884 void CWriter::printContainedStructs(const Type *Ty,
1885 std::set<const StructType*> &StructPrinted){
1886 // Don't walk through pointers.
1887 if (isa<PointerType>(Ty) || Ty->isPrimitiveType() || Ty->isInteger()) return;
1889 // Print all contained types first.
1890 for (Type::subtype_iterator I = Ty->subtype_begin(),
1891 E = Ty->subtype_end(); I != E; ++I)
1892 printContainedStructs(*I, StructPrinted);
1894 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1895 // Check to see if we have already printed this struct.
1896 if (StructPrinted.insert(STy).second) {
1897 // Print structure type out.
1898 std::string Name = TypeNames[STy];
1899 printType(Out, STy, false, Name, true);
1905 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1906 /// isStructReturn - Should this function actually return a struct by-value?
1907 bool isStructReturn = F->hasStructRetAttr();
1909 if (F->hasInternalLinkage()) Out << "static ";
1910 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1911 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1912 switch (F->getCallingConv()) {
1913 case CallingConv::X86_StdCall:
1914 Out << "__stdcall ";
1916 case CallingConv::X86_FastCall:
1917 Out << "__fastcall ";
1921 // Loop over the arguments, printing them...
1922 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1923 const ParamAttrsList *PAL = F->getParamAttrs();
1925 std::stringstream FunctionInnards;
1927 // Print out the name...
1928 FunctionInnards << GetValueName(F) << '(';
1930 bool PrintedArg = false;
1931 if (!F->isDeclaration()) {
1932 if (!F->arg_empty()) {
1933 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1936 // If this is a struct-return function, don't print the hidden
1937 // struct-return argument.
1938 if (isStructReturn) {
1939 assert(I != E && "Invalid struct return function!");
1944 std::string ArgName;
1945 for (; I != E; ++I) {
1946 if (PrintedArg) FunctionInnards << ", ";
1947 if (I->hasName() || !Prototype)
1948 ArgName = GetValueName(I);
1951 const Type *ArgTy = I->getType();
1952 if (PAL && PAL->paramHasAttr(Idx, ParamAttr::ByVal)) {
1953 ArgTy = cast<PointerType>(ArgTy)->getElementType();
1954 ByValParams.insert(I);
1956 printType(FunctionInnards, ArgTy,
1957 /*isSigned=*/PAL && PAL->paramHasAttr(Idx, ParamAttr::SExt),
1964 // Loop over the arguments, printing them.
1965 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1968 // If this is a struct-return function, don't print the hidden
1969 // struct-return argument.
1970 if (isStructReturn) {
1971 assert(I != E && "Invalid struct return function!");
1976 for (; I != E; ++I) {
1977 if (PrintedArg) FunctionInnards << ", ";
1978 const Type *ArgTy = *I;
1979 if (PAL && PAL->paramHasAttr(Idx, ParamAttr::ByVal)) {
1980 assert(isa<PointerType>(ArgTy));
1981 ArgTy = cast<PointerType>(ArgTy)->getElementType();
1983 printType(FunctionInnards, ArgTy,
1984 /*isSigned=*/PAL && PAL->paramHasAttr(Idx, ParamAttr::SExt));
1990 // Finish printing arguments... if this is a vararg function, print the ...,
1991 // unless there are no known types, in which case, we just emit ().
1993 if (FT->isVarArg() && PrintedArg) {
1994 if (PrintedArg) FunctionInnards << ", ";
1995 FunctionInnards << "..."; // Output varargs portion of signature!
1996 } else if (!FT->isVarArg() && !PrintedArg) {
1997 FunctionInnards << "void"; // ret() -> ret(void) in C.
1999 FunctionInnards << ')';
2001 // Get the return tpe for the function.
2003 if (!isStructReturn)
2004 RetTy = F->getReturnType();
2006 // If this is a struct-return function, print the struct-return type.
2007 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
2010 // Print out the return type and the signature built above.
2011 printType(Out, RetTy,
2012 /*isSigned=*/ PAL && PAL->paramHasAttr(0, ParamAttr::SExt),
2013 FunctionInnards.str());
2016 static inline bool isFPIntBitCast(const Instruction &I) {
2017 if (!isa<BitCastInst>(I))
2019 const Type *SrcTy = I.getOperand(0)->getType();
2020 const Type *DstTy = I.getType();
2021 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
2022 (DstTy->isFloatingPoint() && SrcTy->isInteger());
2025 void CWriter::printFunction(Function &F) {
2026 /// isStructReturn - Should this function actually return a struct by-value?
2027 bool isStructReturn = F.hasStructRetAttr();
2029 printFunctionSignature(&F, false);
2032 // If this is a struct return function, handle the result with magic.
2033 if (isStructReturn) {
2034 const Type *StructTy =
2035 cast<PointerType>(F.arg_begin()->getType())->getElementType();
2037 printType(Out, StructTy, false, "StructReturn");
2038 Out << "; /* Struct return temporary */\n";
2041 printType(Out, F.arg_begin()->getType(), false,
2042 GetValueName(F.arg_begin()));
2043 Out << " = &StructReturn;\n";
2046 bool PrintedVar = false;
2048 // print local variable information for the function
2049 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
2050 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
2052 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
2053 Out << "; /* Address-exposed local */\n";
2055 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
2057 printType(Out, I->getType(), false, GetValueName(&*I));
2060 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
2062 printType(Out, I->getType(), false,
2063 GetValueName(&*I)+"__PHI_TEMPORARY");
2068 // We need a temporary for the BitCast to use so it can pluck a value out
2069 // of a union to do the BitCast. This is separate from the need for a
2070 // variable to hold the result of the BitCast.
2071 if (isFPIntBitCast(*I)) {
2072 Out << " llvmBitCastUnion " << GetValueName(&*I)
2073 << "__BITCAST_TEMPORARY;\n";
2081 if (F.hasExternalLinkage() && F.getName() == "main")
2082 Out << " CODE_FOR_MAIN();\n";
2084 // print the basic blocks
2085 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
2086 if (Loop *L = LI->getLoopFor(BB)) {
2087 if (L->getHeader() == BB && L->getParentLoop() == 0)
2090 printBasicBlock(BB);
2097 void CWriter::printLoop(Loop *L) {
2098 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
2099 << "' to make GCC happy */\n";
2100 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
2101 BasicBlock *BB = L->getBlocks()[i];
2102 Loop *BBLoop = LI->getLoopFor(BB);
2104 printBasicBlock(BB);
2105 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
2108 Out << " } while (1); /* end of syntactic loop '"
2109 << L->getHeader()->getName() << "' */\n";
2112 void CWriter::printBasicBlock(BasicBlock *BB) {
2114 // Don't print the label for the basic block if there are no uses, or if
2115 // the only terminator use is the predecessor basic block's terminator.
2116 // We have to scan the use list because PHI nodes use basic blocks too but
2117 // do not require a label to be generated.
2119 bool NeedsLabel = false;
2120 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
2121 if (isGotoCodeNecessary(*PI, BB)) {
2126 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2128 // Output all of the instructions in the basic block...
2129 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2131 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2132 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
2141 // Don't emit prefix or suffix for the terminator...
2142 visit(*BB->getTerminator());
2146 // Specific Instruction type classes... note that all of the casts are
2147 // necessary because we use the instruction classes as opaque types...
2149 void CWriter::visitReturnInst(ReturnInst &I) {
2150 // If this is a struct return function, return the temporary struct.
2151 bool isStructReturn = I.getParent()->getParent()->hasStructRetAttr();
2153 if (isStructReturn) {
2154 Out << " return StructReturn;\n";
2158 // Don't output a void return if this is the last basic block in the function
2159 if (I.getNumOperands() == 0 &&
2160 &*--I.getParent()->getParent()->end() == I.getParent() &&
2161 !I.getParent()->size() == 1) {
2166 if (I.getNumOperands()) {
2168 writeOperand(I.getOperand(0));
2173 void CWriter::visitSwitchInst(SwitchInst &SI) {
2176 writeOperand(SI.getOperand(0));
2177 Out << ") {\n default:\n";
2178 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2179 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2181 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2183 writeOperand(SI.getOperand(i));
2185 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2186 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2187 printBranchToBlock(SI.getParent(), Succ, 2);
2188 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
2194 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2195 Out << " /*UNREACHABLE*/;\n";
2198 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2199 /// FIXME: This should be reenabled, but loop reordering safe!!
2202 if (next(Function::iterator(From)) != Function::iterator(To))
2203 return true; // Not the direct successor, we need a goto.
2205 //isa<SwitchInst>(From->getTerminator())
2207 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2212 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2213 BasicBlock *Successor,
2215 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2216 PHINode *PN = cast<PHINode>(I);
2217 // Now we have to do the printing.
2218 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2219 if (!isa<UndefValue>(IV)) {
2220 Out << std::string(Indent, ' ');
2221 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2223 Out << "; /* for PHI node */\n";
2228 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2230 if (isGotoCodeNecessary(CurBB, Succ)) {
2231 Out << std::string(Indent, ' ') << " goto ";
2237 // Branch instruction printing - Avoid printing out a branch to a basic block
2238 // that immediately succeeds the current one.
2240 void CWriter::visitBranchInst(BranchInst &I) {
2242 if (I.isConditional()) {
2243 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2245 writeOperand(I.getCondition());
2248 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2249 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2251 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2252 Out << " } else {\n";
2253 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2254 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2257 // First goto not necessary, assume second one is...
2259 writeOperand(I.getCondition());
2262 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2263 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2268 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2269 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2274 // PHI nodes get copied into temporary values at the end of predecessor basic
2275 // blocks. We now need to copy these temporary values into the REAL value for
2277 void CWriter::visitPHINode(PHINode &I) {
2279 Out << "__PHI_TEMPORARY";
2283 void CWriter::visitBinaryOperator(Instruction &I) {
2284 // binary instructions, shift instructions, setCond instructions.
2285 assert(!isa<PointerType>(I.getType()));
2287 // We must cast the results of binary operations which might be promoted.
2288 bool needsCast = false;
2289 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2290 || (I.getType() == Type::FloatTy)) {
2293 printType(Out, I.getType(), false);
2297 // If this is a negation operation, print it out as such. For FP, we don't
2298 // want to print "-0.0 - X".
2299 if (BinaryOperator::isNeg(&I)) {
2301 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2303 } else if (I.getOpcode() == Instruction::FRem) {
2304 // Output a call to fmod/fmodf instead of emitting a%b
2305 if (I.getType() == Type::FloatTy)
2307 else if (I.getType() == Type::DoubleTy)
2309 else // all 3 flavors of long double
2311 writeOperand(I.getOperand(0));
2313 writeOperand(I.getOperand(1));
2317 // Write out the cast of the instruction's value back to the proper type
2319 bool NeedsClosingParens = writeInstructionCast(I);
2321 // Certain instructions require the operand to be forced to a specific type
2322 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2323 // below for operand 1
2324 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2326 switch (I.getOpcode()) {
2327 case Instruction::Add: Out << " + "; break;
2328 case Instruction::Sub: Out << " - "; break;
2329 case Instruction::Mul: Out << " * "; break;
2330 case Instruction::URem:
2331 case Instruction::SRem:
2332 case Instruction::FRem: Out << " % "; break;
2333 case Instruction::UDiv:
2334 case Instruction::SDiv:
2335 case Instruction::FDiv: Out << " / "; break;
2336 case Instruction::And: Out << " & "; break;
2337 case Instruction::Or: Out << " | "; break;
2338 case Instruction::Xor: Out << " ^ "; break;
2339 case Instruction::Shl : Out << " << "; break;
2340 case Instruction::LShr:
2341 case Instruction::AShr: Out << " >> "; break;
2342 default: cerr << "Invalid operator type!" << I; abort();
2345 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2346 if (NeedsClosingParens)
2355 void CWriter::visitICmpInst(ICmpInst &I) {
2356 // We must cast the results of icmp which might be promoted.
2357 bool needsCast = false;
2359 // Write out the cast of the instruction's value back to the proper type
2361 bool NeedsClosingParens = writeInstructionCast(I);
2363 // Certain icmp predicate require the operand to be forced to a specific type
2364 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2365 // below for operand 1
2366 writeOperandWithCast(I.getOperand(0), I);
2368 switch (I.getPredicate()) {
2369 case ICmpInst::ICMP_EQ: Out << " == "; break;
2370 case ICmpInst::ICMP_NE: Out << " != "; break;
2371 case ICmpInst::ICMP_ULE:
2372 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2373 case ICmpInst::ICMP_UGE:
2374 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2375 case ICmpInst::ICMP_ULT:
2376 case ICmpInst::ICMP_SLT: Out << " < "; break;
2377 case ICmpInst::ICMP_UGT:
2378 case ICmpInst::ICMP_SGT: Out << " > "; break;
2379 default: cerr << "Invalid icmp predicate!" << I; abort();
2382 writeOperandWithCast(I.getOperand(1), I);
2383 if (NeedsClosingParens)
2391 void CWriter::visitFCmpInst(FCmpInst &I) {
2392 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2396 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2402 switch (I.getPredicate()) {
2403 default: assert(0 && "Illegal FCmp predicate");
2404 case FCmpInst::FCMP_ORD: op = "ord"; break;
2405 case FCmpInst::FCMP_UNO: op = "uno"; break;
2406 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2407 case FCmpInst::FCMP_UNE: op = "une"; break;
2408 case FCmpInst::FCMP_ULT: op = "ult"; break;
2409 case FCmpInst::FCMP_ULE: op = "ule"; break;
2410 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2411 case FCmpInst::FCMP_UGE: op = "uge"; break;
2412 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2413 case FCmpInst::FCMP_ONE: op = "one"; break;
2414 case FCmpInst::FCMP_OLT: op = "olt"; break;
2415 case FCmpInst::FCMP_OLE: op = "ole"; break;
2416 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2417 case FCmpInst::FCMP_OGE: op = "oge"; break;
2420 Out << "llvm_fcmp_" << op << "(";
2421 // Write the first operand
2422 writeOperand(I.getOperand(0));
2424 // Write the second operand
2425 writeOperand(I.getOperand(1));
2429 static const char * getFloatBitCastField(const Type *Ty) {
2430 switch (Ty->getTypeID()) {
2431 default: assert(0 && "Invalid Type");
2432 case Type::FloatTyID: return "Float";
2433 case Type::DoubleTyID: return "Double";
2434 case Type::IntegerTyID: {
2435 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2444 void CWriter::visitCastInst(CastInst &I) {
2445 const Type *DstTy = I.getType();
2446 const Type *SrcTy = I.getOperand(0)->getType();
2448 if (isFPIntBitCast(I)) {
2449 // These int<->float and long<->double casts need to be handled specially
2450 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2451 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2452 writeOperand(I.getOperand(0));
2453 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2454 << getFloatBitCastField(I.getType());
2456 printCast(I.getOpcode(), SrcTy, DstTy);
2457 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::Int1Ty) {
2458 // Make sure we really get a sext from bool by subtracing the bool from 0
2461 writeOperand(I.getOperand(0));
2462 if (DstTy == Type::Int1Ty &&
2463 (I.getOpcode() == Instruction::Trunc ||
2464 I.getOpcode() == Instruction::FPToUI ||
2465 I.getOpcode() == Instruction::FPToSI ||
2466 I.getOpcode() == Instruction::PtrToInt)) {
2467 // Make sure we really get a trunc to bool by anding the operand with 1
2474 void CWriter::visitSelectInst(SelectInst &I) {
2476 writeOperand(I.getCondition());
2478 writeOperand(I.getTrueValue());
2480 writeOperand(I.getFalseValue());
2485 void CWriter::lowerIntrinsics(Function &F) {
2486 // This is used to keep track of intrinsics that get generated to a lowered
2487 // function. We must generate the prototypes before the function body which
2488 // will only be expanded on first use (by the loop below).
2489 std::vector<Function*> prototypesToGen;
2491 // Examine all the instructions in this function to find the intrinsics that
2492 // need to be lowered.
2493 for (Function::iterator BB = F.begin(), EE = F.end(); BB != EE; ++BB)
2494 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2495 if (CallInst *CI = dyn_cast<CallInst>(I++))
2496 if (Function *F = CI->getCalledFunction())
2497 switch (F->getIntrinsicID()) {
2498 case Intrinsic::not_intrinsic:
2499 case Intrinsic::memory_barrier:
2500 case Intrinsic::vastart:
2501 case Intrinsic::vacopy:
2502 case Intrinsic::vaend:
2503 case Intrinsic::returnaddress:
2504 case Intrinsic::frameaddress:
2505 case Intrinsic::setjmp:
2506 case Intrinsic::longjmp:
2507 case Intrinsic::prefetch:
2508 case Intrinsic::dbg_stoppoint:
2509 case Intrinsic::powi:
2510 case Intrinsic::x86_sse_cmp_ss:
2511 case Intrinsic::x86_sse_cmp_ps:
2512 case Intrinsic::x86_sse2_cmp_sd:
2513 case Intrinsic::x86_sse2_cmp_pd:
2514 case Intrinsic::ppc_altivec_lvsl:
2515 // We directly implement these intrinsics
2518 // If this is an intrinsic that directly corresponds to a GCC
2519 // builtin, we handle it.
2520 const char *BuiltinName = "";
2521 #define GET_GCC_BUILTIN_NAME
2522 #include "llvm/Intrinsics.gen"
2523 #undef GET_GCC_BUILTIN_NAME
2524 // If we handle it, don't lower it.
2525 if (BuiltinName[0]) break;
2527 // All other intrinsic calls we must lower.
2528 Instruction *Before = 0;
2529 if (CI != &BB->front())
2530 Before = prior(BasicBlock::iterator(CI));
2532 IL->LowerIntrinsicCall(CI);
2533 if (Before) { // Move iterator to instruction after call
2538 // If the intrinsic got lowered to another call, and that call has
2539 // a definition then we need to make sure its prototype is emitted
2540 // before any calls to it.
2541 if (CallInst *Call = dyn_cast<CallInst>(I))
2542 if (Function *NewF = Call->getCalledFunction())
2543 if (!NewF->isDeclaration())
2544 prototypesToGen.push_back(NewF);
2549 // We may have collected some prototypes to emit in the loop above.
2550 // Emit them now, before the function that uses them is emitted. But,
2551 // be careful not to emit them twice.
2552 std::vector<Function*>::iterator I = prototypesToGen.begin();
2553 std::vector<Function*>::iterator E = prototypesToGen.end();
2554 for ( ; I != E; ++I) {
2555 if (intrinsicPrototypesAlreadyGenerated.insert(*I).second) {
2557 printFunctionSignature(*I, true);
2563 void CWriter::visitCallInst(CallInst &I) {
2564 //check if we have inline asm
2565 if (isInlineAsm(I)) {
2570 bool WroteCallee = false;
2572 // Handle intrinsic function calls first...
2573 if (Function *F = I.getCalledFunction())
2574 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
2575 if (visitBuiltinCall(I, ID, WroteCallee))
2578 Value *Callee = I.getCalledValue();
2580 const PointerType *PTy = cast<PointerType>(Callee->getType());
2581 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2583 // If this is a call to a struct-return function, assign to the first
2584 // parameter instead of passing it to the call.
2585 const ParamAttrsList *PAL = I.getParamAttrs();
2586 bool hasByVal = I.hasByValArgument();
2587 bool isStructRet = I.hasStructRetAttr();
2589 writeOperandDeref(I.getOperand(1));
2593 if (I.isTailCall()) Out << " /*tail*/ ";
2596 // If this is an indirect call to a struct return function, we need to cast
2597 // the pointer. Ditto for indirect calls with byval arguments.
2598 bool NeedsCast = (hasByVal || isStructRet) && !isa<Function>(Callee);
2600 // GCC is a real PITA. It does not permit codegening casts of functions to
2601 // function pointers if they are in a call (it generates a trap instruction
2602 // instead!). We work around this by inserting a cast to void* in between
2603 // the function and the function pointer cast. Unfortunately, we can't just
2604 // form the constant expression here, because the folder will immediately
2607 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2608 // that void* and function pointers have the same size. :( To deal with this
2609 // in the common case, we handle casts where the number of arguments passed
2612 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2614 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2620 // Ok, just cast the pointer type.
2623 printStructReturnPointerFunctionType(Out, PAL,
2624 cast<PointerType>(I.getCalledValue()->getType()));
2626 printType(Out, I.getCalledValue()->getType(), false, "", true, PAL);
2628 printType(Out, I.getCalledValue()->getType());
2631 writeOperand(Callee);
2632 if (NeedsCast) Out << ')';
2637 unsigned NumDeclaredParams = FTy->getNumParams();
2639 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2641 if (isStructRet) { // Skip struct return argument.
2646 bool PrintedArg = false;
2647 for (; AI != AE; ++AI, ++ArgNo) {
2648 if (PrintedArg) Out << ", ";
2649 if (ArgNo < NumDeclaredParams &&
2650 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2652 printType(Out, FTy->getParamType(ArgNo),
2653 /*isSigned=*/PAL && PAL->paramHasAttr(ArgNo+1, ParamAttr::SExt));
2656 // Check if the argument is expected to be passed by value.
2657 if (I.paramHasAttr(ArgNo+1, ParamAttr::ByVal))
2658 writeOperandDeref(*AI);
2666 /// visitBuiltinCall - Handle the call to the specified builtin. Returns true
2667 /// if the entire call is handled, return false it it wasn't handled, and
2668 /// optionally set 'WroteCallee' if the callee has already been printed out.
2669 bool CWriter::visitBuiltinCall(CallInst &I, Intrinsic::ID ID,
2670 bool &WroteCallee) {
2673 // If this is an intrinsic that directly corresponds to a GCC
2674 // builtin, we emit it here.
2675 const char *BuiltinName = "";
2676 Function *F = I.getCalledFunction();
2677 #define GET_GCC_BUILTIN_NAME
2678 #include "llvm/Intrinsics.gen"
2679 #undef GET_GCC_BUILTIN_NAME
2680 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2686 case Intrinsic::memory_barrier:
2687 Out << "__sync_synchronize()";
2689 case Intrinsic::vastart:
2692 Out << "va_start(*(va_list*)";
2693 writeOperand(I.getOperand(1));
2695 // Output the last argument to the enclosing function.
2696 if (I.getParent()->getParent()->arg_empty()) {
2697 cerr << "The C backend does not currently support zero "
2698 << "argument varargs functions, such as '"
2699 << I.getParent()->getParent()->getName() << "'!\n";
2702 writeOperand(--I.getParent()->getParent()->arg_end());
2705 case Intrinsic::vaend:
2706 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2707 Out << "0; va_end(*(va_list*)";
2708 writeOperand(I.getOperand(1));
2711 Out << "va_end(*(va_list*)0)";
2714 case Intrinsic::vacopy:
2716 Out << "va_copy(*(va_list*)";
2717 writeOperand(I.getOperand(1));
2718 Out << ", *(va_list*)";
2719 writeOperand(I.getOperand(2));
2722 case Intrinsic::returnaddress:
2723 Out << "__builtin_return_address(";
2724 writeOperand(I.getOperand(1));
2727 case Intrinsic::frameaddress:
2728 Out << "__builtin_frame_address(";
2729 writeOperand(I.getOperand(1));
2732 case Intrinsic::powi:
2733 Out << "__builtin_powi(";
2734 writeOperand(I.getOperand(1));
2736 writeOperand(I.getOperand(2));
2739 case Intrinsic::setjmp:
2740 Out << "setjmp(*(jmp_buf*)";
2741 writeOperand(I.getOperand(1));
2744 case Intrinsic::longjmp:
2745 Out << "longjmp(*(jmp_buf*)";
2746 writeOperand(I.getOperand(1));
2748 writeOperand(I.getOperand(2));
2751 case Intrinsic::prefetch:
2752 Out << "LLVM_PREFETCH((const void *)";
2753 writeOperand(I.getOperand(1));
2755 writeOperand(I.getOperand(2));
2757 writeOperand(I.getOperand(3));
2760 case Intrinsic::stacksave:
2761 // Emit this as: Val = 0; *((void**)&Val) = __builtin_stack_save()
2762 // to work around GCC bugs (see PR1809).
2763 Out << "0; *((void**)&" << GetValueName(&I)
2764 << ") = __builtin_stack_save()";
2766 case Intrinsic::dbg_stoppoint: {
2767 // If we use writeOperand directly we get a "u" suffix which is rejected
2769 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2772 << " \"" << SPI.getDirectory()
2773 << SPI.getFileName() << "\"\n";
2776 case Intrinsic::x86_sse_cmp_ss:
2777 case Intrinsic::x86_sse_cmp_ps:
2778 case Intrinsic::x86_sse2_cmp_sd:
2779 case Intrinsic::x86_sse2_cmp_pd:
2781 printType(Out, I.getType());
2783 // Multiple GCC builtins multiplex onto this intrinsic.
2784 switch (cast<ConstantInt>(I.getOperand(3))->getZExtValue()) {
2785 default: assert(0 && "Invalid llvm.x86.sse.cmp!");
2786 case 0: Out << "__builtin_ia32_cmpeq"; break;
2787 case 1: Out << "__builtin_ia32_cmplt"; break;
2788 case 2: Out << "__builtin_ia32_cmple"; break;
2789 case 3: Out << "__builtin_ia32_cmpunord"; break;
2790 case 4: Out << "__builtin_ia32_cmpneq"; break;
2791 case 5: Out << "__builtin_ia32_cmpnlt"; break;
2792 case 6: Out << "__builtin_ia32_cmpnle"; break;
2793 case 7: Out << "__builtin_ia32_cmpord"; break;
2795 if (ID == Intrinsic::x86_sse_cmp_ps || ID == Intrinsic::x86_sse2_cmp_pd)
2799 if (ID == Intrinsic::x86_sse_cmp_ss || ID == Intrinsic::x86_sse_cmp_ps)
2805 writeOperand(I.getOperand(1));
2807 writeOperand(I.getOperand(2));
2810 case Intrinsic::ppc_altivec_lvsl:
2812 printType(Out, I.getType());
2814 Out << "__builtin_altivec_lvsl(0, (void*)";
2815 writeOperand(I.getOperand(1));
2821 //This converts the llvm constraint string to something gcc is expecting.
2822 //TODO: work out platform independent constraints and factor those out
2823 // of the per target tables
2824 // handle multiple constraint codes
2825 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2827 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2829 const char** table = 0;
2831 //Grab the translation table from TargetAsmInfo if it exists
2834 const TargetMachineRegistry::entry* Match =
2835 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2837 //Per platform Target Machines don't exist, so create it
2838 // this must be done only once
2839 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2840 TAsm = TM->getTargetAsmInfo();
2844 table = TAsm->getAsmCBE();
2846 //Search the translation table if it exists
2847 for (int i = 0; table && table[i]; i += 2)
2848 if (c.Codes[0] == table[i])
2851 //default is identity
2855 //TODO: import logic from AsmPrinter.cpp
2856 static std::string gccifyAsm(std::string asmstr) {
2857 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2858 if (asmstr[i] == '\n')
2859 asmstr.replace(i, 1, "\\n");
2860 else if (asmstr[i] == '\t')
2861 asmstr.replace(i, 1, "\\t");
2862 else if (asmstr[i] == '$') {
2863 if (asmstr[i + 1] == '{') {
2864 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2865 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2866 std::string n = "%" +
2867 asmstr.substr(a + 1, b - a - 1) +
2868 asmstr.substr(i + 2, a - i - 2);
2869 asmstr.replace(i, b - i + 1, n);
2872 asmstr.replace(i, 1, "%");
2874 else if (asmstr[i] == '%')//grr
2875 { asmstr.replace(i, 1, "%%"); ++i;}
2880 //TODO: assumptions about what consume arguments from the call are likely wrong
2881 // handle communitivity
2882 void CWriter::visitInlineAsm(CallInst &CI) {
2883 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2884 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2885 std::vector<std::pair<std::string, Value*> > Input;
2886 std::vector<std::pair<std::string, Value*> > Output;
2887 std::string Clobber;
2888 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2889 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2890 E = Constraints.end(); I != E; ++I) {
2891 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2893 InterpretASMConstraint(*I);
2896 assert(0 && "Unknown asm constraint");
2898 case InlineAsm::isInput: {
2900 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2901 ++count; //consume arg
2905 case InlineAsm::isOutput: {
2907 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2908 count ? CI.getOperand(count) : &CI));
2909 ++count; //consume arg
2913 case InlineAsm::isClobber: {
2915 Clobber += ",\"" + c + "\"";
2921 //fix up the asm string for gcc
2922 std::string asmstr = gccifyAsm(as->getAsmString());
2924 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2926 for (std::vector<std::pair<std::string, Value*> >::iterator I =Output.begin(),
2927 E = Output.end(); I != E; ++I) {
2928 Out << "\"" << I->first << "\"(";
2929 writeOperandRaw(I->second);
2935 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2936 E = Input.end(); I != E; ++I) {
2937 Out << "\"" << I->first << "\"(";
2938 writeOperandRaw(I->second);
2944 Out << "\n :" << Clobber.substr(1);
2948 void CWriter::visitMallocInst(MallocInst &I) {
2949 assert(0 && "lowerallocations pass didn't work!");
2952 void CWriter::visitAllocaInst(AllocaInst &I) {
2954 printType(Out, I.getType());
2955 Out << ") alloca(sizeof(";
2956 printType(Out, I.getType()->getElementType());
2958 if (I.isArrayAllocation()) {
2960 writeOperand(I.getOperand(0));
2965 void CWriter::visitFreeInst(FreeInst &I) {
2966 assert(0 && "lowerallocations pass didn't work!");
2969 void CWriter::printGEPExpression(Value *Ptr, gep_type_iterator I,
2970 gep_type_iterator E) {
2972 // If there are no indices, just print out the pointer.
2978 // Find out if the last index is into a vector. If so, we have to print this
2979 // specially. Since vectors can't have elements of indexable type, only the
2980 // last index could possibly be of a vector element.
2981 const VectorType *LastIndexIsVector = 0;
2983 for (gep_type_iterator TmpI = I; TmpI != E; ++TmpI)
2984 LastIndexIsVector = dyn_cast<VectorType>(*TmpI);
2989 // If the last index is into a vector, we can't print it as &a[i][j] because
2990 // we can't index into a vector with j in GCC. Instead, emit this as
2991 // (((float*)&a[i])+j)
2992 if (LastIndexIsVector) {
2994 printType(Out, PointerType::getUnqual(LastIndexIsVector->getElementType()));
3000 // If the first index is 0 (very typical) we can do a number of
3001 // simplifications to clean up the code.
3002 Value *FirstOp = I.getOperand();
3003 if (!isa<Constant>(FirstOp) || !cast<Constant>(FirstOp)->isNullValue()) {
3004 // First index isn't simple, print it the hard way.
3007 ++I; // Skip the zero index.
3009 // Okay, emit the first operand. If Ptr is something that is already address
3010 // exposed, like a global, avoid emitting (&foo)[0], just emit foo instead.
3011 if (isAddressExposed(Ptr)) {
3012 writeOperandInternal(Ptr);
3013 } else if (I != E && isa<StructType>(*I)) {
3014 // If we didn't already emit the first operand, see if we can print it as
3015 // P->f instead of "P[0].f"
3017 Out << "->field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3018 ++I; // eat the struct index as well.
3020 // Instead of emitting P[0][1], emit (*P)[1], which is more idiomatic.
3027 for (; I != E; ++I) {
3028 if (isa<StructType>(*I)) {
3029 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3030 } else if (!isa<VectorType>(*I)) {
3032 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3035 // If the last index is into a vector, then print it out as "+j)". This
3036 // works with the 'LastIndexIsVector' code above.
3037 if (isa<Constant>(I.getOperand()) &&
3038 cast<Constant>(I.getOperand())->isNullValue()) {
3039 Out << "))"; // avoid "+0".
3042 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3050 void CWriter::writeMemoryAccess(Value *Operand, const Type *OperandType,
3051 bool IsVolatile, unsigned Alignment) {
3053 bool IsUnaligned = Alignment &&
3054 Alignment < TD->getABITypeAlignment(OperandType);
3058 if (IsVolatile || IsUnaligned) {
3061 Out << "struct __attribute__ ((packed, aligned(" << Alignment << "))) {";
3062 printType(Out, OperandType, false, IsUnaligned ? "data" : "volatile*");
3065 if (IsVolatile) Out << "volatile ";
3071 writeOperand(Operand);
3073 if (IsVolatile || IsUnaligned) {
3080 void CWriter::visitLoadInst(LoadInst &I) {
3081 writeMemoryAccess(I.getOperand(0), I.getType(), I.isVolatile(),
3086 void CWriter::visitStoreInst(StoreInst &I) {
3087 writeMemoryAccess(I.getPointerOperand(), I.getOperand(0)->getType(),
3088 I.isVolatile(), I.getAlignment());
3090 Value *Operand = I.getOperand(0);
3091 Constant *BitMask = 0;
3092 if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
3093 if (!ITy->isPowerOf2ByteWidth())
3094 // We have a bit width that doesn't match an even power-of-2 byte
3095 // size. Consequently we must & the value with the type's bit mask
3096 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
3099 writeOperand(Operand);
3102 printConstant(BitMask);
3107 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
3108 printGEPExpression(I.getPointerOperand(), gep_type_begin(I),
3112 void CWriter::visitVAArgInst(VAArgInst &I) {
3113 Out << "va_arg(*(va_list*)";
3114 writeOperand(I.getOperand(0));
3116 printType(Out, I.getType());
3120 void CWriter::visitInsertElementInst(InsertElementInst &I) {
3121 const Type *EltTy = I.getType()->getElementType();
3122 writeOperand(I.getOperand(0));
3125 printType(Out, PointerType::getUnqual(EltTy));
3126 Out << ")(&" << GetValueName(&I) << "))[";
3127 writeOperand(I.getOperand(2));
3129 writeOperand(I.getOperand(1));
3133 void CWriter::visitExtractElementInst(ExtractElementInst &I) {
3134 // We know that our operand is not inlined.
3137 cast<VectorType>(I.getOperand(0)->getType())->getElementType();
3138 printType(Out, PointerType::getUnqual(EltTy));
3139 Out << ")(&" << GetValueName(I.getOperand(0)) << "))[";
3140 writeOperand(I.getOperand(1));
3144 void CWriter::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
3146 printType(Out, SVI.getType());
3148 const VectorType *VT = SVI.getType();
3149 unsigned NumElts = VT->getNumElements();
3150 const Type *EltTy = VT->getElementType();
3152 for (unsigned i = 0; i != NumElts; ++i) {
3154 int SrcVal = SVI.getMaskValue(i);
3155 if ((unsigned)SrcVal >= NumElts*2) {
3156 Out << " 0/*undef*/ ";
3158 Value *Op = SVI.getOperand((unsigned)SrcVal >= NumElts);
3159 if (isa<Instruction>(Op)) {
3160 // Do an extractelement of this value from the appropriate input.
3162 printType(Out, PointerType::getUnqual(EltTy));
3163 Out << ")(&" << GetValueName(Op)
3164 << "))[" << (SrcVal & NumElts-1) << "]";
3165 } else if (isa<ConstantAggregateZero>(Op) || isa<UndefValue>(Op)) {
3168 printConstant(cast<ConstantVector>(Op)->getOperand(SrcVal & NumElts-1));
3176 //===----------------------------------------------------------------------===//
3177 // External Interface declaration
3178 //===----------------------------------------------------------------------===//
3180 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
3182 CodeGenFileType FileType,
3184 if (FileType != TargetMachine::AssemblyFile) return true;
3186 PM.add(createGCLoweringPass());
3187 PM.add(createLowerAllocationsPass(true));
3188 PM.add(createLowerInvokePass());
3189 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
3190 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
3191 PM.add(new CWriter(o));
3192 PM.add(createCollectorMetadataDeleter());