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/Pass.h"
22 #include "llvm/PassManager.h"
23 #include "llvm/TypeSymbolTable.h"
24 #include "llvm/Intrinsics.h"
25 #include "llvm/IntrinsicInst.h"
26 #include "llvm/InlineAsm.h"
27 #include "llvm/Analysis/ConstantsScanner.h"
28 #include "llvm/Analysis/FindUsedTypes.h"
29 #include "llvm/Analysis/LoopInfo.h"
30 #include "llvm/CodeGen/Passes.h"
31 #include "llvm/CodeGen/IntrinsicLowering.h"
32 #include "llvm/Transforms/Scalar.h"
33 #include "llvm/Target/TargetMachineRegistry.h"
34 #include "llvm/Target/TargetAsmInfo.h"
35 #include "llvm/Target/TargetData.h"
36 #include "llvm/Support/CallSite.h"
37 #include "llvm/Support/CFG.h"
38 #include "llvm/Support/GetElementPtrTypeIterator.h"
39 #include "llvm/Support/InstVisitor.h"
40 #include "llvm/Support/Mangler.h"
41 #include "llvm/Support/MathExtras.h"
42 #include "llvm/ADT/StringExtras.h"
43 #include "llvm/ADT/STLExtras.h"
44 #include "llvm/Support/MathExtras.h"
45 #include "llvm/Config/config.h"
50 // Register the target.
51 static RegisterTarget<CTargetMachine> X("c", " C backend");
54 /// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
55 /// any unnamed structure types that are used by the program, and merges
56 /// external functions with the same name.
58 class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
61 CBackendNameAllUsedStructsAndMergeFunctions()
62 : ModulePass((intptr_t)&ID) {}
63 void getAnalysisUsage(AnalysisUsage &AU) const {
64 AU.addRequired<FindUsedTypes>();
67 virtual const char *getPassName() const {
68 return "C backend type canonicalizer";
71 virtual bool runOnModule(Module &M);
74 char CBackendNameAllUsedStructsAndMergeFunctions::ID = 0;
76 /// CWriter - This class is the main chunk of code that converts an LLVM
77 /// module to a C translation unit.
78 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
80 IntrinsicLowering *IL;
83 const Module *TheModule;
84 const TargetAsmInfo* TAsm;
86 std::map<const Type *, std::string> TypeNames;
87 std::map<const ConstantFP *, unsigned> FPConstantMap;
88 std::set<Function*> intrinsicPrototypesAlreadyGenerated;
89 std::set<const Argument*> ByValParams;
93 explicit CWriter(std::ostream &o)
94 : FunctionPass((intptr_t)&ID), Out(o), IL(0), Mang(0), LI(0),
95 TheModule(0), TAsm(0), TD(0) {}
97 virtual const char *getPassName() const { return "C backend"; }
99 void getAnalysisUsage(AnalysisUsage &AU) const {
100 AU.addRequired<LoopInfo>();
101 AU.setPreservesAll();
104 virtual bool doInitialization(Module &M);
106 bool runOnFunction(Function &F) {
107 LI = &getAnalysis<LoopInfo>();
109 // Get rid of intrinsics we can't handle.
112 // Output all floating point constants that cannot be printed accurately.
113 printFloatingPointConstants(F);
119 virtual bool doFinalization(Module &M) {
122 FPConstantMap.clear();
125 intrinsicPrototypesAlreadyGenerated.clear();
129 std::ostream &printType(std::ostream &Out, const Type *Ty,
130 bool isSigned = false,
131 const std::string &VariableName = "",
132 bool IgnoreName = false,
133 const PAListPtr &PAL = PAListPtr());
134 std::ostream &printSimpleType(std::ostream &Out, const Type *Ty,
136 const std::string &NameSoFar = "");
138 void printStructReturnPointerFunctionType(std::ostream &Out,
139 const PAListPtr &PAL,
140 const PointerType *Ty);
142 /// writeOperandDeref - Print the result of dereferencing the specified
143 /// operand with '*'. This is equivalent to printing '*' then using
144 /// writeOperand, but avoids excess syntax in some cases.
145 void writeOperandDeref(Value *Operand) {
146 if (isAddressExposed(Operand)) {
147 // Already something with an address exposed.
148 writeOperandInternal(Operand);
151 writeOperand(Operand);
156 void writeOperand(Value *Operand);
157 void writeOperandRaw(Value *Operand);
158 void writeInstComputationInline(Instruction &I);
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 Type *> &);
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 isa<InsertValueInst>(I))
215 // Don't inline a load across a store or other bad things!
218 // Must not be used in inline asm, extractelement, or shufflevector.
220 const Instruction &User = cast<Instruction>(*I.use_back());
221 if (isInlineAsm(User) || isa<ExtractElementInst>(User) ||
222 isa<ShuffleVectorInst>(User))
226 // Only inline instruction it if it's use is in the same BB as the inst.
227 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
230 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
231 // variables which are accessed with the & operator. This causes GCC to
232 // generate significantly better code than to emit alloca calls directly.
234 static const AllocaInst *isDirectAlloca(const Value *V) {
235 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
236 if (!AI) return false;
237 if (AI->isArrayAllocation())
238 return 0; // FIXME: we can also inline fixed size array allocas!
239 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
244 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
245 static bool isInlineAsm(const Instruction& I) {
246 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
251 // Instruction visitation functions
252 friend class InstVisitor<CWriter>;
254 void visitReturnInst(ReturnInst &I);
255 void visitBranchInst(BranchInst &I);
256 void visitSwitchInst(SwitchInst &I);
257 void visitInvokeInst(InvokeInst &I) {
258 assert(0 && "Lowerinvoke pass didn't work!");
261 void visitUnwindInst(UnwindInst &I) {
262 assert(0 && "Lowerinvoke pass didn't work!");
264 void visitUnreachableInst(UnreachableInst &I);
266 void visitPHINode(PHINode &I);
267 void visitBinaryOperator(Instruction &I);
268 void visitICmpInst(ICmpInst &I);
269 void visitFCmpInst(FCmpInst &I);
271 void visitCastInst (CastInst &I);
272 void visitSelectInst(SelectInst &I);
273 void visitCallInst (CallInst &I);
274 void visitInlineAsm(CallInst &I);
275 bool visitBuiltinCall(CallInst &I, Intrinsic::ID ID, bool &WroteCallee);
277 void visitMallocInst(MallocInst &I);
278 void visitAllocaInst(AllocaInst &I);
279 void visitFreeInst (FreeInst &I);
280 void visitLoadInst (LoadInst &I);
281 void visitStoreInst (StoreInst &I);
282 void visitGetElementPtrInst(GetElementPtrInst &I);
283 void visitVAArgInst (VAArgInst &I);
285 void visitInsertElementInst(InsertElementInst &I);
286 void visitExtractElementInst(ExtractElementInst &I);
287 void visitShuffleVectorInst(ShuffleVectorInst &SVI);
288 void visitGetResultInst(GetResultInst &GRI);
290 void visitInsertValueInst(InsertValueInst &I);
291 void visitExtractValueInst(ExtractValueInst &I);
293 void visitInstruction(Instruction &I) {
294 cerr << "C Writer does not know about " << I;
298 void outputLValue(Instruction *I) {
299 Out << " " << GetValueName(I) << " = ";
302 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
303 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
304 BasicBlock *Successor, unsigned Indent);
305 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
307 void printGEPExpression(Value *Ptr, gep_type_iterator I,
308 gep_type_iterator E);
310 std::string GetValueName(const Value *Operand);
314 char CWriter::ID = 0;
316 /// This method inserts names for any unnamed structure types that are used by
317 /// the program, and removes names from structure types that are not used by the
320 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
321 // Get a set of types that are used by the program...
322 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
324 // Loop over the module symbol table, removing types from UT that are
325 // already named, and removing names for types that are not used.
327 TypeSymbolTable &TST = M.getTypeSymbolTable();
328 for (TypeSymbolTable::iterator TI = TST.begin(), TE = TST.end();
330 TypeSymbolTable::iterator I = TI++;
332 // If this isn't a struct or array type, remove it from our set of types
333 // to name. This simplifies emission later.
334 if (!isa<StructType>(I->second) && !isa<OpaqueType>(I->second) &&
335 !isa<ArrayType>(I->second)) {
338 // If this is not used, remove it from the symbol table.
339 std::set<const Type *>::iterator UTI = UT.find(I->second);
343 UT.erase(UTI); // Only keep one name for this type.
347 // UT now contains types that are not named. Loop over it, naming
350 bool Changed = false;
351 unsigned RenameCounter = 0;
352 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
354 if (isa<StructType>(*I) || isa<ArrayType>(*I)) {
355 while (M.addTypeName("unnamed"+utostr(RenameCounter), *I))
361 // Loop over all external functions and globals. If we have two with
362 // identical names, merge them.
363 // FIXME: This code should disappear when we don't allow values with the same
364 // names when they have different types!
365 std::map<std::string, GlobalValue*> ExtSymbols;
366 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
368 if (GV->isDeclaration() && GV->hasName()) {
369 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
370 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
372 // Found a conflict, replace this global with the previous one.
373 GlobalValue *OldGV = X.first->second;
374 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
375 GV->eraseFromParent();
380 // Do the same for globals.
381 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
383 GlobalVariable *GV = I++;
384 if (GV->isDeclaration() && GV->hasName()) {
385 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
386 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
388 // Found a conflict, replace this global with the previous one.
389 GlobalValue *OldGV = X.first->second;
390 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
391 GV->eraseFromParent();
400 /// printStructReturnPointerFunctionType - This is like printType for a struct
401 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
402 /// print it as "Struct (*)(...)", for struct return functions.
403 void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
404 const PAListPtr &PAL,
405 const PointerType *TheTy) {
406 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
407 std::stringstream FunctionInnards;
408 FunctionInnards << " (*) (";
409 bool PrintedType = false;
411 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
412 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
414 for (++I, ++Idx; I != E; ++I, ++Idx) {
416 FunctionInnards << ", ";
417 const Type *ArgTy = *I;
418 if (PAL.paramHasAttr(Idx, ParamAttr::ByVal)) {
419 assert(isa<PointerType>(ArgTy));
420 ArgTy = cast<PointerType>(ArgTy)->getElementType();
422 printType(FunctionInnards, ArgTy,
423 /*isSigned=*/PAL.paramHasAttr(Idx, ParamAttr::SExt), "");
426 if (FTy->isVarArg()) {
428 FunctionInnards << ", ...";
429 } else if (!PrintedType) {
430 FunctionInnards << "void";
432 FunctionInnards << ')';
433 std::string tstr = FunctionInnards.str();
434 printType(Out, RetTy,
435 /*isSigned=*/PAL.paramHasAttr(0, ParamAttr::SExt), tstr);
439 CWriter::printSimpleType(std::ostream &Out, const Type *Ty, bool isSigned,
440 const std::string &NameSoFar) {
441 assert((Ty->isPrimitiveType() || Ty->isInteger() || isa<VectorType>(Ty)) &&
442 "Invalid type for printSimpleType");
443 switch (Ty->getTypeID()) {
444 case Type::VoidTyID: return Out << "void " << NameSoFar;
445 case Type::IntegerTyID: {
446 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
448 return Out << "bool " << NameSoFar;
449 else if (NumBits <= 8)
450 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
451 else if (NumBits <= 16)
452 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
453 else if (NumBits <= 32)
454 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
455 else if (NumBits <= 64)
456 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
458 assert(NumBits <= 128 && "Bit widths > 128 not implemented yet");
459 return Out << (isSigned?"llvmInt128":"llvmUInt128") << " " << NameSoFar;
462 case Type::FloatTyID: return Out << "float " << NameSoFar;
463 case Type::DoubleTyID: return Out << "double " << NameSoFar;
464 // Lacking emulation of FP80 on PPC, etc., we assume whichever of these is
465 // present matches host 'long double'.
466 case Type::X86_FP80TyID:
467 case Type::PPC_FP128TyID:
468 case Type::FP128TyID: return Out << "long double " << NameSoFar;
470 case Type::VectorTyID: {
471 const VectorType *VTy = cast<VectorType>(Ty);
472 return printSimpleType(Out, VTy->getElementType(), isSigned,
473 " __attribute__((vector_size(" +
474 utostr(TD->getABITypeSize(VTy)) + " ))) " + NameSoFar);
478 cerr << "Unknown primitive type: " << *Ty << "\n";
483 // Pass the Type* and the variable name and this prints out the variable
486 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
487 bool isSigned, const std::string &NameSoFar,
488 bool IgnoreName, const PAListPtr &PAL) {
489 if (Ty->isPrimitiveType() || Ty->isInteger() || isa<VectorType>(Ty)) {
490 printSimpleType(Out, Ty, isSigned, NameSoFar);
494 // Check to see if the type is named.
495 if (!IgnoreName || isa<OpaqueType>(Ty)) {
496 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
497 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
500 switch (Ty->getTypeID()) {
501 case Type::FunctionTyID: {
502 const FunctionType *FTy = cast<FunctionType>(Ty);
503 std::stringstream FunctionInnards;
504 FunctionInnards << " (" << NameSoFar << ") (";
506 for (FunctionType::param_iterator I = FTy->param_begin(),
507 E = FTy->param_end(); I != E; ++I) {
508 const Type *ArgTy = *I;
509 if (PAL.paramHasAttr(Idx, ParamAttr::ByVal)) {
510 assert(isa<PointerType>(ArgTy));
511 ArgTy = cast<PointerType>(ArgTy)->getElementType();
513 if (I != FTy->param_begin())
514 FunctionInnards << ", ";
515 printType(FunctionInnards, ArgTy,
516 /*isSigned=*/PAL.paramHasAttr(Idx, ParamAttr::SExt), "");
519 if (FTy->isVarArg()) {
520 if (FTy->getNumParams())
521 FunctionInnards << ", ...";
522 } else if (!FTy->getNumParams()) {
523 FunctionInnards << "void";
525 FunctionInnards << ')';
526 std::string tstr = FunctionInnards.str();
527 printType(Out, FTy->getReturnType(),
528 /*isSigned=*/PAL.paramHasAttr(0, ParamAttr::SExt), tstr);
531 case Type::StructTyID: {
532 const StructType *STy = cast<StructType>(Ty);
533 Out << NameSoFar + " {\n";
535 for (StructType::element_iterator I = STy->element_begin(),
536 E = STy->element_end(); I != E; ++I) {
538 printType(Out, *I, false, "field" + utostr(Idx++));
543 Out << " __attribute__ ((packed))";
547 case Type::PointerTyID: {
548 const PointerType *PTy = cast<PointerType>(Ty);
549 std::string ptrName = "*" + NameSoFar;
551 if (isa<ArrayType>(PTy->getElementType()) ||
552 isa<VectorType>(PTy->getElementType()))
553 ptrName = "(" + ptrName + ")";
556 // Must be a function ptr cast!
557 return printType(Out, PTy->getElementType(), false, ptrName, true, PAL);
558 return printType(Out, PTy->getElementType(), false, ptrName);
561 case Type::ArrayTyID: {
562 const ArrayType *ATy = cast<ArrayType>(Ty);
563 unsigned NumElements = ATy->getNumElements();
564 if (NumElements == 0) NumElements = 1;
565 // Arrays are wrapped in structs to allow them to have normal
566 // value semantics (avoiding the array "decay").
567 Out << NameSoFar << " { ";
568 printType(Out, ATy->getElementType(), false,
569 "array[" + utostr(NumElements) + "]");
573 case Type::OpaqueTyID: {
574 static int Count = 0;
575 std::string TyName = "struct opaque_" + itostr(Count++);
576 assert(TypeNames.find(Ty) == TypeNames.end());
577 TypeNames[Ty] = TyName;
578 return Out << TyName << ' ' << NameSoFar;
581 assert(0 && "Unhandled case in getTypeProps!");
588 void CWriter::printConstantArray(ConstantArray *CPA) {
590 // As a special case, print the array as a string if it is an array of
591 // ubytes or an array of sbytes with positive values.
593 const Type *ETy = CPA->getType()->getElementType();
594 bool isString = (ETy == Type::Int8Ty || ETy == Type::Int8Ty);
596 // Make sure the last character is a null char, as automatically added by C
597 if (isString && (CPA->getNumOperands() == 0 ||
598 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
603 // Keep track of whether the last number was a hexadecimal escape
604 bool LastWasHex = false;
606 // Do not include the last character, which we know is null
607 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
608 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
610 // Print it out literally if it is a printable character. The only thing
611 // to be careful about is when the last letter output was a hex escape
612 // code, in which case we have to be careful not to print out hex digits
613 // explicitly (the C compiler thinks it is a continuation of the previous
614 // character, sheesh...)
616 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
618 if (C == '"' || C == '\\')
625 case '\n': Out << "\\n"; break;
626 case '\t': Out << "\\t"; break;
627 case '\r': Out << "\\r"; break;
628 case '\v': Out << "\\v"; break;
629 case '\a': Out << "\\a"; break;
630 case '\"': Out << "\\\""; break;
631 case '\'': Out << "\\\'"; break;
634 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
635 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
644 if (CPA->getNumOperands()) {
646 printConstant(cast<Constant>(CPA->getOperand(0)));
647 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
649 printConstant(cast<Constant>(CPA->getOperand(i)));
656 void CWriter::printConstantVector(ConstantVector *CP) {
658 if (CP->getNumOperands()) {
660 printConstant(cast<Constant>(CP->getOperand(0)));
661 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
663 printConstant(cast<Constant>(CP->getOperand(i)));
669 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
670 // textually as a double (rather than as a reference to a stack-allocated
671 // variable). We decide this by converting CFP to a string and back into a
672 // double, and then checking whether the conversion results in a bit-equal
673 // double to the original value of CFP. This depends on us and the target C
674 // compiler agreeing on the conversion process (which is pretty likely since we
675 // only deal in IEEE FP).
677 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
678 // Do long doubles in hex for now.
679 if (CFP->getType()!=Type::FloatTy && CFP->getType()!=Type::DoubleTy)
681 APFloat APF = APFloat(CFP->getValueAPF()); // copy
682 if (CFP->getType()==Type::FloatTy)
683 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven);
684 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
686 sprintf(Buffer, "%a", APF.convertToDouble());
687 if (!strncmp(Buffer, "0x", 2) ||
688 !strncmp(Buffer, "-0x", 3) ||
689 !strncmp(Buffer, "+0x", 3))
690 return APF.bitwiseIsEqual(APFloat(atof(Buffer)));
693 std::string StrVal = ftostr(APF);
695 while (StrVal[0] == ' ')
696 StrVal.erase(StrVal.begin());
698 // Check to make sure that the stringized number is not some string like "Inf"
699 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
700 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
701 ((StrVal[0] == '-' || StrVal[0] == '+') &&
702 (StrVal[1] >= '0' && StrVal[1] <= '9')))
703 // Reparse stringized version!
704 return APF.bitwiseIsEqual(APFloat(atof(StrVal.c_str())));
709 /// Print out the casting for a cast operation. This does the double casting
710 /// necessary for conversion to the destination type, if necessary.
711 /// @brief Print a cast
712 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
713 // Print the destination type cast
715 case Instruction::UIToFP:
716 case Instruction::SIToFP:
717 case Instruction::IntToPtr:
718 case Instruction::Trunc:
719 case Instruction::BitCast:
720 case Instruction::FPExt:
721 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
723 printType(Out, DstTy);
726 case Instruction::ZExt:
727 case Instruction::PtrToInt:
728 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
730 printSimpleType(Out, DstTy, false);
733 case Instruction::SExt:
734 case Instruction::FPToSI: // For these, make sure we get a signed dest
736 printSimpleType(Out, DstTy, true);
740 assert(0 && "Invalid cast opcode");
743 // Print the source type cast
745 case Instruction::UIToFP:
746 case Instruction::ZExt:
748 printSimpleType(Out, SrcTy, false);
751 case Instruction::SIToFP:
752 case Instruction::SExt:
754 printSimpleType(Out, SrcTy, true);
757 case Instruction::IntToPtr:
758 case Instruction::PtrToInt:
759 // Avoid "cast to pointer from integer of different size" warnings
760 Out << "(unsigned long)";
762 case Instruction::Trunc:
763 case Instruction::BitCast:
764 case Instruction::FPExt:
765 case Instruction::FPTrunc:
766 case Instruction::FPToSI:
767 case Instruction::FPToUI:
768 break; // These don't need a source cast.
770 assert(0 && "Invalid cast opcode");
775 // printConstant - The LLVM Constant to C Constant converter.
776 void CWriter::printConstant(Constant *CPV) {
777 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
778 switch (CE->getOpcode()) {
779 case Instruction::Trunc:
780 case Instruction::ZExt:
781 case Instruction::SExt:
782 case Instruction::FPTrunc:
783 case Instruction::FPExt:
784 case Instruction::UIToFP:
785 case Instruction::SIToFP:
786 case Instruction::FPToUI:
787 case Instruction::FPToSI:
788 case Instruction::PtrToInt:
789 case Instruction::IntToPtr:
790 case Instruction::BitCast:
792 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
793 if (CE->getOpcode() == Instruction::SExt &&
794 CE->getOperand(0)->getType() == Type::Int1Ty) {
795 // Make sure we really sext from bool here by subtracting from 0
798 printConstant(CE->getOperand(0));
799 if (CE->getType() == Type::Int1Ty &&
800 (CE->getOpcode() == Instruction::Trunc ||
801 CE->getOpcode() == Instruction::FPToUI ||
802 CE->getOpcode() == Instruction::FPToSI ||
803 CE->getOpcode() == Instruction::PtrToInt)) {
804 // Make sure we really truncate to bool here by anding with 1
810 case Instruction::GetElementPtr:
812 printGEPExpression(CE->getOperand(0), gep_type_begin(CPV),
816 case Instruction::Select:
818 printConstant(CE->getOperand(0));
820 printConstant(CE->getOperand(1));
822 printConstant(CE->getOperand(2));
825 case Instruction::Add:
826 case Instruction::Sub:
827 case Instruction::Mul:
828 case Instruction::SDiv:
829 case Instruction::UDiv:
830 case Instruction::FDiv:
831 case Instruction::URem:
832 case Instruction::SRem:
833 case Instruction::FRem:
834 case Instruction::And:
835 case Instruction::Or:
836 case Instruction::Xor:
837 case Instruction::ICmp:
838 case Instruction::Shl:
839 case Instruction::LShr:
840 case Instruction::AShr:
843 bool NeedsClosingParens = printConstExprCast(CE);
844 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
845 switch (CE->getOpcode()) {
846 case Instruction::Add: Out << " + "; break;
847 case Instruction::Sub: Out << " - "; break;
848 case Instruction::Mul: Out << " * "; break;
849 case Instruction::URem:
850 case Instruction::SRem:
851 case Instruction::FRem: Out << " % "; break;
852 case Instruction::UDiv:
853 case Instruction::SDiv:
854 case Instruction::FDiv: Out << " / "; break;
855 case Instruction::And: Out << " & "; break;
856 case Instruction::Or: Out << " | "; break;
857 case Instruction::Xor: Out << " ^ "; break;
858 case Instruction::Shl: Out << " << "; break;
859 case Instruction::LShr:
860 case Instruction::AShr: Out << " >> "; break;
861 case Instruction::ICmp:
862 switch (CE->getPredicate()) {
863 case ICmpInst::ICMP_EQ: Out << " == "; break;
864 case ICmpInst::ICMP_NE: Out << " != "; break;
865 case ICmpInst::ICMP_SLT:
866 case ICmpInst::ICMP_ULT: Out << " < "; break;
867 case ICmpInst::ICMP_SLE:
868 case ICmpInst::ICMP_ULE: Out << " <= "; break;
869 case ICmpInst::ICMP_SGT:
870 case ICmpInst::ICMP_UGT: Out << " > "; break;
871 case ICmpInst::ICMP_SGE:
872 case ICmpInst::ICMP_UGE: Out << " >= "; break;
873 default: assert(0 && "Illegal ICmp predicate");
876 default: assert(0 && "Illegal opcode here!");
878 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
879 if (NeedsClosingParens)
884 case Instruction::FCmp: {
886 bool NeedsClosingParens = printConstExprCast(CE);
887 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
889 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
893 switch (CE->getPredicate()) {
894 default: assert(0 && "Illegal FCmp predicate");
895 case FCmpInst::FCMP_ORD: op = "ord"; break;
896 case FCmpInst::FCMP_UNO: op = "uno"; break;
897 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
898 case FCmpInst::FCMP_UNE: op = "une"; break;
899 case FCmpInst::FCMP_ULT: op = "ult"; break;
900 case FCmpInst::FCMP_ULE: op = "ule"; break;
901 case FCmpInst::FCMP_UGT: op = "ugt"; break;
902 case FCmpInst::FCMP_UGE: op = "uge"; break;
903 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
904 case FCmpInst::FCMP_ONE: op = "one"; break;
905 case FCmpInst::FCMP_OLT: op = "olt"; break;
906 case FCmpInst::FCMP_OLE: op = "ole"; break;
907 case FCmpInst::FCMP_OGT: op = "ogt"; break;
908 case FCmpInst::FCMP_OGE: op = "oge"; break;
910 Out << "llvm_fcmp_" << op << "(";
911 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
913 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
916 if (NeedsClosingParens)
922 cerr << "CWriter Error: Unhandled constant expression: "
926 } else if (isa<UndefValue>(CPV) && CPV->getType()->isSingleValueType()) {
928 printType(Out, CPV->getType()); // sign doesn't matter
930 if (!isa<VectorType>(CPV->getType())) {
938 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
939 const Type* Ty = CI->getType();
940 if (Ty == Type::Int1Ty)
941 Out << (CI->getZExtValue() ? '1' : '0');
942 else if (Ty == Type::Int32Ty)
943 Out << CI->getZExtValue() << 'u';
944 else if (Ty->getPrimitiveSizeInBits() > 32)
945 Out << CI->getZExtValue() << "ull";
948 printSimpleType(Out, Ty, false) << ')';
949 if (CI->isMinValue(true))
950 Out << CI->getZExtValue() << 'u';
952 Out << CI->getSExtValue();
958 switch (CPV->getType()->getTypeID()) {
959 case Type::FloatTyID:
960 case Type::DoubleTyID:
961 case Type::X86_FP80TyID:
962 case Type::PPC_FP128TyID:
963 case Type::FP128TyID: {
964 ConstantFP *FPC = cast<ConstantFP>(CPV);
965 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
966 if (I != FPConstantMap.end()) {
967 // Because of FP precision problems we must load from a stack allocated
968 // value that holds the value in hex.
969 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" :
970 FPC->getType() == Type::DoubleTy ? "double" :
972 << "*)&FPConstant" << I->second << ')';
974 assert(FPC->getType() == Type::FloatTy ||
975 FPC->getType() == Type::DoubleTy);
976 double V = FPC->getType() == Type::FloatTy ?
977 FPC->getValueAPF().convertToFloat() :
978 FPC->getValueAPF().convertToDouble();
982 // FIXME the actual NaN bits should be emitted.
983 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
985 const unsigned long QuietNaN = 0x7ff8UL;
986 //const unsigned long SignalNaN = 0x7ff4UL;
988 // We need to grab the first part of the FP #
991 uint64_t ll = DoubleToBits(V);
992 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
994 std::string Num(&Buffer[0], &Buffer[6]);
995 unsigned long Val = strtoul(Num.c_str(), 0, 16);
997 if (FPC->getType() == Type::FloatTy)
998 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
999 << Buffer << "\") /*nan*/ ";
1001 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
1002 << Buffer << "\") /*nan*/ ";
1003 } else if (IsInf(V)) {
1005 if (V < 0) Out << '-';
1006 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
1010 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
1011 // Print out the constant as a floating point number.
1013 sprintf(Buffer, "%a", V);
1016 Num = ftostr(FPC->getValueAPF());
1024 case Type::ArrayTyID:
1025 Out << "{ "; // Arrays are wrapped in struct types.
1026 if (ConstantArray *CA = dyn_cast<ConstantArray>(CPV)) {
1027 printConstantArray(CA);
1029 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1030 const ArrayType *AT = cast<ArrayType>(CPV->getType());
1032 if (AT->getNumElements()) {
1034 Constant *CZ = Constant::getNullValue(AT->getElementType());
1036 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
1043 Out << " }"; // Arrays are wrapped in struct types.
1046 case Type::VectorTyID:
1047 // Use C99 compound expression literal initializer syntax.
1049 printType(Out, CPV->getType());
1051 if (ConstantVector *CV = dyn_cast<ConstantVector>(CPV)) {
1052 printConstantVector(CV);
1054 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1055 const VectorType *VT = cast<VectorType>(CPV->getType());
1057 Constant *CZ = Constant::getNullValue(VT->getElementType());
1059 for (unsigned i = 1, e = VT->getNumElements(); i != e; ++i) {
1067 case Type::StructTyID:
1068 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
1069 const StructType *ST = cast<StructType>(CPV->getType());
1071 if (ST->getNumElements()) {
1073 printConstant(Constant::getNullValue(ST->getElementType(0)));
1074 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
1076 printConstant(Constant::getNullValue(ST->getElementType(i)));
1082 if (CPV->getNumOperands()) {
1084 printConstant(cast<Constant>(CPV->getOperand(0)));
1085 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
1087 printConstant(cast<Constant>(CPV->getOperand(i)));
1094 case Type::PointerTyID:
1095 if (isa<ConstantPointerNull>(CPV)) {
1097 printType(Out, CPV->getType()); // sign doesn't matter
1098 Out << ")/*NULL*/0)";
1100 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
1106 cerr << "Unknown constant type: " << *CPV << "\n";
1111 // Some constant expressions need to be casted back to the original types
1112 // because their operands were casted to the expected type. This function takes
1113 // care of detecting that case and printing the cast for the ConstantExpr.
1114 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
1115 bool NeedsExplicitCast = false;
1116 const Type *Ty = CE->getOperand(0)->getType();
1117 bool TypeIsSigned = false;
1118 switch (CE->getOpcode()) {
1119 case Instruction::LShr:
1120 case Instruction::URem:
1121 case Instruction::UDiv: NeedsExplicitCast = true; break;
1122 case Instruction::AShr:
1123 case Instruction::SRem:
1124 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1125 case Instruction::SExt:
1127 NeedsExplicitCast = true;
1128 TypeIsSigned = true;
1130 case Instruction::ZExt:
1131 case Instruction::Trunc:
1132 case Instruction::FPTrunc:
1133 case Instruction::FPExt:
1134 case Instruction::UIToFP:
1135 case Instruction::SIToFP:
1136 case Instruction::FPToUI:
1137 case Instruction::FPToSI:
1138 case Instruction::PtrToInt:
1139 case Instruction::IntToPtr:
1140 case Instruction::BitCast:
1142 NeedsExplicitCast = true;
1146 if (NeedsExplicitCast) {
1148 if (Ty->isInteger() && Ty != Type::Int1Ty)
1149 printSimpleType(Out, Ty, TypeIsSigned);
1151 printType(Out, Ty); // not integer, sign doesn't matter
1154 return NeedsExplicitCast;
1157 // Print a constant assuming that it is the operand for a given Opcode. The
1158 // opcodes that care about sign need to cast their operands to the expected
1159 // type before the operation proceeds. This function does the casting.
1160 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1162 // Extract the operand's type, we'll need it.
1163 const Type* OpTy = CPV->getType();
1165 // Indicate whether to do the cast or not.
1166 bool shouldCast = false;
1167 bool typeIsSigned = false;
1169 // Based on the Opcode for which this Constant is being written, determine
1170 // the new type to which the operand should be casted by setting the value
1171 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1175 // for most instructions, it doesn't matter
1177 case Instruction::LShr:
1178 case Instruction::UDiv:
1179 case Instruction::URem:
1182 case Instruction::AShr:
1183 case Instruction::SDiv:
1184 case Instruction::SRem:
1186 typeIsSigned = true;
1190 // Write out the casted constant if we should, otherwise just write the
1194 printSimpleType(Out, OpTy, typeIsSigned);
1202 std::string CWriter::GetValueName(const Value *Operand) {
1205 if (!isa<GlobalValue>(Operand) && Operand->getName() != "") {
1206 std::string VarName;
1208 Name = Operand->getName();
1209 VarName.reserve(Name.capacity());
1211 for (std::string::iterator I = Name.begin(), E = Name.end();
1215 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1216 (ch >= '0' && ch <= '9') || ch == '_')) {
1218 sprintf(buffer, "_%x_", ch);
1224 Name = "llvm_cbe_" + VarName;
1226 Name = Mang->getValueName(Operand);
1228 // Check, if operand has assembler identifier and handle it separately
1229 if (Operand->getNameStart()[0] == 1)
1230 Name = "llvm_cbe_asmname_" + Name;
1236 /// writeInstComputationInline - Emit the computation for the specified
1237 /// instruction inline, with no destination provided.
1238 void CWriter::writeInstComputationInline(Instruction &I) {
1239 // If this is a non-trivial bool computation, make sure to truncate down to
1240 // a 1 bit value. This is important because we want "add i1 x, y" to return
1241 // "0" when x and y are true, not "2" for example.
1242 bool NeedBoolTrunc = false;
1243 if (I.getType() == Type::Int1Ty && !isa<ICmpInst>(I) && !isa<FCmpInst>(I))
1244 NeedBoolTrunc = true;
1256 void CWriter::writeOperandInternal(Value *Operand) {
1257 if (Instruction *I = dyn_cast<Instruction>(Operand))
1258 // Should we inline this instruction to build a tree?
1259 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1261 writeInstComputationInline(*I);
1266 Constant* CPV = dyn_cast<Constant>(Operand);
1268 if (CPV && !isa<GlobalValue>(CPV))
1271 Out << GetValueName(Operand);
1274 void CWriter::writeOperandRaw(Value *Operand) {
1275 Constant* CPV = dyn_cast<Constant>(Operand);
1276 if (CPV && !isa<GlobalValue>(CPV)) {
1279 Out << GetValueName(Operand);
1283 void CWriter::writeOperand(Value *Operand) {
1284 bool isAddressImplicit = isAddressExposed(Operand);
1285 if (isAddressImplicit)
1286 Out << "(&"; // Global variables are referenced as their addresses by llvm
1288 writeOperandInternal(Operand);
1290 if (isAddressImplicit)
1294 // Some instructions need to have their result value casted back to the
1295 // original types because their operands were casted to the expected type.
1296 // This function takes care of detecting that case and printing the cast
1297 // for the Instruction.
1298 bool CWriter::writeInstructionCast(const Instruction &I) {
1299 const Type *Ty = I.getOperand(0)->getType();
1300 switch (I.getOpcode()) {
1301 case Instruction::LShr:
1302 case Instruction::URem:
1303 case Instruction::UDiv:
1305 printSimpleType(Out, Ty, false);
1308 case Instruction::AShr:
1309 case Instruction::SRem:
1310 case Instruction::SDiv:
1312 printSimpleType(Out, Ty, true);
1320 // Write the operand with a cast to another type based on the Opcode being used.
1321 // This will be used in cases where an instruction has specific type
1322 // requirements (usually signedness) for its operands.
1323 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1325 // Extract the operand's type, we'll need it.
1326 const Type* OpTy = Operand->getType();
1328 // Indicate whether to do the cast or not.
1329 bool shouldCast = false;
1331 // Indicate whether the cast should be to a signed type or not.
1332 bool castIsSigned = false;
1334 // Based on the Opcode for which this Operand is being written, determine
1335 // the new type to which the operand should be casted by setting the value
1336 // of OpTy. If we change OpTy, also set shouldCast to true.
1339 // for most instructions, it doesn't matter
1341 case Instruction::LShr:
1342 case Instruction::UDiv:
1343 case Instruction::URem: // Cast to unsigned first
1345 castIsSigned = false;
1347 case Instruction::GetElementPtr:
1348 case Instruction::AShr:
1349 case Instruction::SDiv:
1350 case Instruction::SRem: // Cast to signed first
1352 castIsSigned = true;
1356 // Write out the casted operand if we should, otherwise just write the
1360 printSimpleType(Out, OpTy, castIsSigned);
1362 writeOperand(Operand);
1365 writeOperand(Operand);
1368 // Write the operand with a cast to another type based on the icmp predicate
1370 void CWriter::writeOperandWithCast(Value* Operand, const ICmpInst &Cmp) {
1371 // This has to do a cast to ensure the operand has the right signedness.
1372 // Also, if the operand is a pointer, we make sure to cast to an integer when
1373 // doing the comparison both for signedness and so that the C compiler doesn't
1374 // optimize things like "p < NULL" to false (p may contain an integer value
1376 bool shouldCast = Cmp.isRelational();
1378 // Write out the casted operand if we should, otherwise just write the
1381 writeOperand(Operand);
1385 // Should this be a signed comparison? If so, convert to signed.
1386 bool castIsSigned = Cmp.isSignedPredicate();
1388 // If the operand was a pointer, convert to a large integer type.
1389 const Type* OpTy = Operand->getType();
1390 if (isa<PointerType>(OpTy))
1391 OpTy = TD->getIntPtrType();
1394 printSimpleType(Out, OpTy, castIsSigned);
1396 writeOperand(Operand);
1400 // generateCompilerSpecificCode - This is where we add conditional compilation
1401 // directives to cater to specific compilers as need be.
1403 static void generateCompilerSpecificCode(std::ostream& Out,
1404 const TargetData *TD) {
1405 // Alloca is hard to get, and we don't want to include stdlib.h here.
1406 Out << "/* get a declaration for alloca */\n"
1407 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1408 << "#define alloca(x) __builtin_alloca((x))\n"
1409 << "#define _alloca(x) __builtin_alloca((x))\n"
1410 << "#elif defined(__APPLE__)\n"
1411 << "extern void *__builtin_alloca(unsigned long);\n"
1412 << "#define alloca(x) __builtin_alloca(x)\n"
1413 << "#define longjmp _longjmp\n"
1414 << "#define setjmp _setjmp\n"
1415 << "#elif defined(__sun__)\n"
1416 << "#if defined(__sparcv9)\n"
1417 << "extern void *__builtin_alloca(unsigned long);\n"
1419 << "extern void *__builtin_alloca(unsigned int);\n"
1421 << "#define alloca(x) __builtin_alloca(x)\n"
1422 << "#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)\n"
1423 << "#define alloca(x) __builtin_alloca(x)\n"
1424 << "#elif defined(_MSC_VER)\n"
1425 << "#define inline _inline\n"
1426 << "#define alloca(x) _alloca(x)\n"
1428 << "#include <alloca.h>\n"
1431 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1432 // If we aren't being compiled with GCC, just drop these attributes.
1433 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1434 << "#define __attribute__(X)\n"
1437 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1438 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1439 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1440 << "#elif defined(__GNUC__)\n"
1441 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1443 << "#define __EXTERNAL_WEAK__\n"
1446 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1447 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1448 << "#define __ATTRIBUTE_WEAK__\n"
1449 << "#elif defined(__GNUC__)\n"
1450 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1452 << "#define __ATTRIBUTE_WEAK__\n"
1455 // Add hidden visibility support. FIXME: APPLE_CC?
1456 Out << "#if defined(__GNUC__)\n"
1457 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1460 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1461 // From the GCC documentation:
1463 // double __builtin_nan (const char *str)
1465 // This is an implementation of the ISO C99 function nan.
1467 // Since ISO C99 defines this function in terms of strtod, which we do
1468 // not implement, a description of the parsing is in order. The string is
1469 // parsed as by strtol; that is, the base is recognized by leading 0 or
1470 // 0x prefixes. The number parsed is placed in the significand such that
1471 // the least significant bit of the number is at the least significant
1472 // bit of the significand. The number is truncated to fit the significand
1473 // field provided. The significand is forced to be a quiet NaN.
1475 // This function, if given a string literal, is evaluated early enough
1476 // that it is considered a compile-time constant.
1478 // float __builtin_nanf (const char *str)
1480 // Similar to __builtin_nan, except the return type is float.
1482 // double __builtin_inf (void)
1484 // Similar to __builtin_huge_val, except a warning is generated if the
1485 // target floating-point format does not support infinities. This
1486 // function is suitable for implementing the ISO C99 macro INFINITY.
1488 // float __builtin_inff (void)
1490 // Similar to __builtin_inf, except the return type is float.
1491 Out << "#ifdef __GNUC__\n"
1492 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1493 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1494 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1495 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1496 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1497 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1498 << "#define LLVM_PREFETCH(addr,rw,locality) "
1499 "__builtin_prefetch(addr,rw,locality)\n"
1500 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1501 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1502 << "#define LLVM_ASM __asm__\n"
1504 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1505 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1506 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1507 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1508 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1509 << "#define LLVM_INFF 0.0F /* Float */\n"
1510 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1511 << "#define __ATTRIBUTE_CTOR__\n"
1512 << "#define __ATTRIBUTE_DTOR__\n"
1513 << "#define LLVM_ASM(X)\n"
1516 Out << "#if __GNUC__ < 4 /* Old GCC's, or compilers not GCC */ \n"
1517 << "#define __builtin_stack_save() 0 /* not implemented */\n"
1518 << "#define __builtin_stack_restore(X) /* noop */\n"
1521 // Output typedefs for 128-bit integers. If these are needed with a
1522 // 32-bit target or with a C compiler that doesn't support mode(TI),
1523 // more drastic measures will be needed.
1524 if (TD->getPointerSize() >= 8) {
1525 Out << "#ifdef __GNUC__ /* 128-bit integer types */\n"
1526 << "typedef int __attribute__((mode(TI))) llvmInt128;\n"
1527 << "typedef unsigned __attribute__((mode(TI))) llvmUInt128;\n"
1531 // Output target-specific code that should be inserted into main.
1532 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1535 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1536 /// the StaticTors set.
1537 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1538 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1539 if (!InitList) return;
1541 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1542 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1543 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1545 if (CS->getOperand(1)->isNullValue())
1546 return; // Found a null terminator, exit printing.
1547 Constant *FP = CS->getOperand(1);
1548 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1550 FP = CE->getOperand(0);
1551 if (Function *F = dyn_cast<Function>(FP))
1552 StaticTors.insert(F);
1556 enum SpecialGlobalClass {
1558 GlobalCtors, GlobalDtors,
1562 /// getGlobalVariableClass - If this is a global that is specially recognized
1563 /// by LLVM, return a code that indicates how we should handle it.
1564 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1565 // If this is a global ctors/dtors list, handle it now.
1566 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1567 if (GV->getName() == "llvm.global_ctors")
1569 else if (GV->getName() == "llvm.global_dtors")
1573 // Otherwise, it it is other metadata, don't print it. This catches things
1574 // like debug information.
1575 if (GV->getSection() == "llvm.metadata")
1582 bool CWriter::doInitialization(Module &M) {
1586 TD = new TargetData(&M);
1587 IL = new IntrinsicLowering(*TD);
1588 IL->AddPrototypes(M);
1590 // Ensure that all structure types have names...
1591 Mang = new Mangler(M);
1592 Mang->markCharUnacceptable('.');
1594 // Keep track of which functions are static ctors/dtors so they can have
1595 // an attribute added to their prototypes.
1596 std::set<Function*> StaticCtors, StaticDtors;
1597 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1599 switch (getGlobalVariableClass(I)) {
1602 FindStaticTors(I, StaticCtors);
1605 FindStaticTors(I, StaticDtors);
1610 // get declaration for alloca
1611 Out << "/* Provide Declarations */\n";
1612 Out << "#include <stdarg.h>\n"; // Varargs support
1613 Out << "#include <setjmp.h>\n"; // Unwind support
1614 generateCompilerSpecificCode(Out, TD);
1616 // Provide a definition for `bool' if not compiling with a C++ compiler.
1618 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1620 << "\n\n/* Support for floating point constants */\n"
1621 << "typedef unsigned long long ConstantDoubleTy;\n"
1622 << "typedef unsigned int ConstantFloatTy;\n"
1623 << "typedef struct { unsigned long long f1; unsigned short f2; "
1624 "unsigned short pad[3]; } ConstantFP80Ty;\n"
1625 // This is used for both kinds of 128-bit long double; meaning differs.
1626 << "typedef struct { unsigned long long f1; unsigned long long f2; }"
1627 " ConstantFP128Ty;\n"
1628 << "\n\n/* Global Declarations */\n";
1630 // First output all the declarations for the program, because C requires
1631 // Functions & globals to be declared before they are used.
1634 // Loop over the symbol table, emitting all named constants...
1635 printModuleTypes(M.getTypeSymbolTable());
1637 // Global variable declarations...
1638 if (!M.global_empty()) {
1639 Out << "\n/* External Global Variable Declarations */\n";
1640 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1643 if (I->hasExternalLinkage() || I->hasExternalWeakLinkage() ||
1644 I->hasCommonLinkage())
1646 else if (I->hasDLLImportLinkage())
1647 Out << "__declspec(dllimport) ";
1649 continue; // Internal Global
1651 // Thread Local Storage
1652 if (I->isThreadLocal())
1655 printType(Out, I->getType()->getElementType(), false, GetValueName(I));
1657 if (I->hasExternalWeakLinkage())
1658 Out << " __EXTERNAL_WEAK__";
1660 // Special handling for assembler identifiers
1661 if (I->getNameStart()[0] == 1)
1662 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1668 // Function declarations
1669 Out << "\n/* Function Declarations */\n";
1670 Out << "double fmod(double, double);\n"; // Support for FP rem
1671 Out << "float fmodf(float, float);\n";
1672 Out << "long double fmodl(long double, long double);\n";
1674 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1675 // Don't print declarations for intrinsic functions.
1676 if (!I->isIntrinsic() && I->getName() != "setjmp" &&
1677 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1678 if (I->hasExternalWeakLinkage())
1680 printFunctionSignature(I, true);
1681 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1682 Out << " __ATTRIBUTE_WEAK__";
1683 if (I->hasExternalWeakLinkage())
1684 Out << " __EXTERNAL_WEAK__";
1685 if (StaticCtors.count(I))
1686 Out << " __ATTRIBUTE_CTOR__";
1687 if (StaticDtors.count(I))
1688 Out << " __ATTRIBUTE_DTOR__";
1689 if (I->hasHiddenVisibility())
1690 Out << " __HIDDEN__";
1692 // Special handling for assembler identifiers
1693 if (I->getNameStart()[0] == 1)
1694 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1700 // Output the global variable declarations
1701 if (!M.global_empty()) {
1702 Out << "\n\n/* Global Variable Declarations */\n";
1703 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1705 if (!I->isDeclaration()) {
1706 // Ignore special globals, such as debug info.
1707 if (getGlobalVariableClass(I))
1710 if (I->hasInternalLinkage())
1715 // Thread Local Storage
1716 if (I->isThreadLocal())
1719 printType(Out, I->getType()->getElementType(), false,
1722 if (I->hasLinkOnceLinkage())
1723 Out << " __attribute__((common))";
1724 else if (I->hasCommonLinkage()) // FIXME is this right?
1725 Out << " __ATTRIBUTE_WEAK__";
1726 else if (I->hasWeakLinkage())
1727 Out << " __ATTRIBUTE_WEAK__";
1728 else if (I->hasExternalWeakLinkage())
1729 Out << " __EXTERNAL_WEAK__";
1730 if (I->hasHiddenVisibility())
1731 Out << " __HIDDEN__";
1733 // Special handling for assembler identifiers
1734 if (I->getNameStart()[0] == 1)
1735 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1741 // Output the global variable definitions and contents...
1742 if (!M.global_empty()) {
1743 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1744 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1746 if (!I->isDeclaration()) {
1747 // Ignore special globals, such as debug info.
1748 if (getGlobalVariableClass(I))
1751 if (I->hasInternalLinkage())
1753 else if (I->hasDLLImportLinkage())
1754 Out << "__declspec(dllimport) ";
1755 else if (I->hasDLLExportLinkage())
1756 Out << "__declspec(dllexport) ";
1758 // Thread Local Storage
1759 if (I->isThreadLocal())
1762 printType(Out, I->getType()->getElementType(), false,
1764 if (I->hasLinkOnceLinkage())
1765 Out << " __attribute__((common))";
1766 else if (I->hasWeakLinkage())
1767 Out << " __ATTRIBUTE_WEAK__";
1768 else if (I->hasCommonLinkage())
1769 Out << " __ATTRIBUTE_WEAK__";
1771 if (I->hasHiddenVisibility())
1772 Out << " __HIDDEN__";
1774 // If the initializer is not null, emit the initializer. If it is null,
1775 // we try to avoid emitting large amounts of zeros. The problem with
1776 // this, however, occurs when the variable has weak linkage. In this
1777 // case, the assembler will complain about the variable being both weak
1778 // and common, so we disable this optimization.
1779 // FIXME common linkage should avoid this problem.
1780 if (!I->getInitializer()->isNullValue()) {
1782 writeOperand(I->getInitializer());
1783 } else if (I->hasWeakLinkage()) {
1784 // We have to specify an initializer, but it doesn't have to be
1785 // complete. If the value is an aggregate, print out { 0 }, and let
1786 // the compiler figure out the rest of the zeros.
1788 if (isa<StructType>(I->getInitializer()->getType()) ||
1789 isa<VectorType>(I->getInitializer()->getType())) {
1791 } else if (isa<ArrayType>(I->getInitializer()->getType())) {
1792 // As with structs and vectors, but with an extra set of braces
1793 // because arrays are wrapped in structs.
1796 // Just print it out normally.
1797 writeOperand(I->getInitializer());
1805 Out << "\n\n/* Function Bodies */\n";
1807 // Emit some helper functions for dealing with FCMP instruction's
1809 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1810 Out << "return X == X && Y == Y; }\n";
1811 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1812 Out << "return X != X || Y != Y; }\n";
1813 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1814 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1815 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1816 Out << "return X != Y; }\n";
1817 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1818 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1819 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1820 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1821 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1822 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1823 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1824 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1825 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1826 Out << "return X == Y ; }\n";
1827 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1828 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1829 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1830 Out << "return X < Y ; }\n";
1831 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1832 Out << "return X > Y ; }\n";
1833 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1834 Out << "return X <= Y ; }\n";
1835 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1836 Out << "return X >= Y ; }\n";
1841 /// Output all floating point constants that cannot be printed accurately...
1842 void CWriter::printFloatingPointConstants(Function &F) {
1843 // Scan the module for floating point constants. If any FP constant is used
1844 // in the function, we want to redirect it here so that we do not depend on
1845 // the precision of the printed form, unless the printed form preserves
1848 static unsigned FPCounter = 0;
1849 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1851 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1852 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1853 !FPConstantMap.count(FPC)) {
1854 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1856 if (FPC->getType() == Type::DoubleTy) {
1857 double Val = FPC->getValueAPF().convertToDouble();
1858 uint64_t i = FPC->getValueAPF().convertToAPInt().getZExtValue();
1859 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1860 << " = 0x" << std::hex << i << std::dec
1861 << "ULL; /* " << Val << " */\n";
1862 } else if (FPC->getType() == Type::FloatTy) {
1863 float Val = FPC->getValueAPF().convertToFloat();
1864 uint32_t i = (uint32_t)FPC->getValueAPF().convertToAPInt().
1866 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1867 << " = 0x" << std::hex << i << std::dec
1868 << "U; /* " << Val << " */\n";
1869 } else if (FPC->getType() == Type::X86_FP80Ty) {
1870 // api needed to prevent premature destruction
1871 APInt api = FPC->getValueAPF().convertToAPInt();
1872 const uint64_t *p = api.getRawData();
1873 Out << "static const ConstantFP80Ty FPConstant" << FPCounter++
1874 << " = { 0x" << std::hex
1875 << ((uint16_t)p[1] | (p[0] & 0xffffffffffffLL)<<16)
1876 << "ULL, 0x" << (uint16_t)(p[0] >> 48) << ",{0,0,0}"
1877 << "}; /* Long double constant */\n" << std::dec;
1878 } else if (FPC->getType() == Type::PPC_FP128Ty) {
1879 APInt api = FPC->getValueAPF().convertToAPInt();
1880 const uint64_t *p = api.getRawData();
1881 Out << "static const ConstantFP128Ty FPConstant" << FPCounter++
1882 << " = { 0x" << std::hex
1883 << p[0] << ", 0x" << p[1]
1884 << "}; /* Long double constant */\n" << std::dec;
1887 assert(0 && "Unknown float type!");
1894 /// printSymbolTable - Run through symbol table looking for type names. If a
1895 /// type name is found, emit its declaration...
1897 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1898 Out << "/* Helper union for bitcasts */\n";
1899 Out << "typedef union {\n";
1900 Out << " unsigned int Int32;\n";
1901 Out << " unsigned long long Int64;\n";
1902 Out << " float Float;\n";
1903 Out << " double Double;\n";
1904 Out << "} llvmBitCastUnion;\n";
1906 // We are only interested in the type plane of the symbol table.
1907 TypeSymbolTable::const_iterator I = TST.begin();
1908 TypeSymbolTable::const_iterator End = TST.end();
1910 // If there are no type names, exit early.
1911 if (I == End) return;
1913 // Print out forward declarations for structure types before anything else!
1914 Out << "/* Structure forward decls */\n";
1915 for (; I != End; ++I) {
1916 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1917 Out << Name << ";\n";
1918 TypeNames.insert(std::make_pair(I->second, Name));
1923 // Now we can print out typedefs. Above, we guaranteed that this can only be
1924 // for struct or opaque types.
1925 Out << "/* Typedefs */\n";
1926 for (I = TST.begin(); I != End; ++I) {
1927 std::string Name = "l_" + Mang->makeNameProper(I->first);
1929 printType(Out, I->second, false, Name);
1935 // Keep track of which structures have been printed so far...
1936 std::set<const Type *> StructPrinted;
1938 // Loop over all structures then push them into the stack so they are
1939 // printed in the correct order.
1941 Out << "/* Structure contents */\n";
1942 for (I = TST.begin(); I != End; ++I)
1943 if (isa<StructType>(I->second) || isa<ArrayType>(I->second))
1944 // Only print out used types!
1945 printContainedStructs(I->second, StructPrinted);
1948 // Push the struct onto the stack and recursively push all structs
1949 // this one depends on.
1951 // TODO: Make this work properly with vector types
1953 void CWriter::printContainedStructs(const Type *Ty,
1954 std::set<const Type*> &StructPrinted) {
1955 // Don't walk through pointers.
1956 if (isa<PointerType>(Ty) || Ty->isPrimitiveType() || Ty->isInteger()) return;
1958 // Print all contained types first.
1959 for (Type::subtype_iterator I = Ty->subtype_begin(),
1960 E = Ty->subtype_end(); I != E; ++I)
1961 printContainedStructs(*I, StructPrinted);
1963 if (isa<StructType>(Ty) || isa<ArrayType>(Ty)) {
1964 // Check to see if we have already printed this struct.
1965 if (StructPrinted.insert(Ty).second) {
1966 // Print structure type out.
1967 std::string Name = TypeNames[Ty];
1968 printType(Out, Ty, false, Name, true);
1974 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1975 /// isStructReturn - Should this function actually return a struct by-value?
1976 bool isStructReturn = F->hasStructRetAttr();
1978 if (F->hasInternalLinkage()) Out << "static ";
1979 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1980 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1981 switch (F->getCallingConv()) {
1982 case CallingConv::X86_StdCall:
1983 Out << "__stdcall ";
1985 case CallingConv::X86_FastCall:
1986 Out << "__fastcall ";
1990 // Loop over the arguments, printing them...
1991 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1992 const PAListPtr &PAL = F->getParamAttrs();
1994 std::stringstream FunctionInnards;
1996 // Print out the name...
1997 FunctionInnards << GetValueName(F) << '(';
1999 bool PrintedArg = false;
2000 if (!F->isDeclaration()) {
2001 if (!F->arg_empty()) {
2002 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
2005 // If this is a struct-return function, don't print the hidden
2006 // struct-return argument.
2007 if (isStructReturn) {
2008 assert(I != E && "Invalid struct return function!");
2013 std::string ArgName;
2014 for (; I != E; ++I) {
2015 if (PrintedArg) FunctionInnards << ", ";
2016 if (I->hasName() || !Prototype)
2017 ArgName = GetValueName(I);
2020 const Type *ArgTy = I->getType();
2021 if (PAL.paramHasAttr(Idx, ParamAttr::ByVal)) {
2022 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2023 ByValParams.insert(I);
2025 printType(FunctionInnards, ArgTy,
2026 /*isSigned=*/PAL.paramHasAttr(Idx, ParamAttr::SExt),
2033 // Loop over the arguments, printing them.
2034 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
2037 // If this is a struct-return function, don't print the hidden
2038 // struct-return argument.
2039 if (isStructReturn) {
2040 assert(I != E && "Invalid struct return function!");
2045 for (; I != E; ++I) {
2046 if (PrintedArg) FunctionInnards << ", ";
2047 const Type *ArgTy = *I;
2048 if (PAL.paramHasAttr(Idx, ParamAttr::ByVal)) {
2049 assert(isa<PointerType>(ArgTy));
2050 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2052 printType(FunctionInnards, ArgTy,
2053 /*isSigned=*/PAL.paramHasAttr(Idx, ParamAttr::SExt));
2059 // Finish printing arguments... if this is a vararg function, print the ...,
2060 // unless there are no known types, in which case, we just emit ().
2062 if (FT->isVarArg() && PrintedArg) {
2063 if (PrintedArg) FunctionInnards << ", ";
2064 FunctionInnards << "..."; // Output varargs portion of signature!
2065 } else if (!FT->isVarArg() && !PrintedArg) {
2066 FunctionInnards << "void"; // ret() -> ret(void) in C.
2068 FunctionInnards << ')';
2070 // Get the return tpe for the function.
2072 if (!isStructReturn)
2073 RetTy = F->getReturnType();
2075 // If this is a struct-return function, print the struct-return type.
2076 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
2079 // Print out the return type and the signature built above.
2080 printType(Out, RetTy,
2081 /*isSigned=*/PAL.paramHasAttr(0, ParamAttr::SExt),
2082 FunctionInnards.str());
2085 static inline bool isFPIntBitCast(const Instruction &I) {
2086 if (!isa<BitCastInst>(I))
2088 const Type *SrcTy = I.getOperand(0)->getType();
2089 const Type *DstTy = I.getType();
2090 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
2091 (DstTy->isFloatingPoint() && SrcTy->isInteger());
2094 void CWriter::printFunction(Function &F) {
2095 /// isStructReturn - Should this function actually return a struct by-value?
2096 bool isStructReturn = F.hasStructRetAttr();
2098 printFunctionSignature(&F, false);
2101 // If this is a struct return function, handle the result with magic.
2102 if (isStructReturn) {
2103 const Type *StructTy =
2104 cast<PointerType>(F.arg_begin()->getType())->getElementType();
2106 printType(Out, StructTy, false, "StructReturn");
2107 Out << "; /* Struct return temporary */\n";
2110 printType(Out, F.arg_begin()->getType(), false,
2111 GetValueName(F.arg_begin()));
2112 Out << " = &StructReturn;\n";
2115 bool PrintedVar = false;
2117 // print local variable information for the function
2118 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
2119 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
2121 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
2122 Out << "; /* Address-exposed local */\n";
2124 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
2126 printType(Out, I->getType(), false, GetValueName(&*I));
2129 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
2131 printType(Out, I->getType(), false,
2132 GetValueName(&*I)+"__PHI_TEMPORARY");
2137 // We need a temporary for the BitCast to use so it can pluck a value out
2138 // of a union to do the BitCast. This is separate from the need for a
2139 // variable to hold the result of the BitCast.
2140 if (isFPIntBitCast(*I)) {
2141 Out << " llvmBitCastUnion " << GetValueName(&*I)
2142 << "__BITCAST_TEMPORARY;\n";
2150 if (F.hasExternalLinkage() && F.getName() == "main")
2151 Out << " CODE_FOR_MAIN();\n";
2153 // print the basic blocks
2154 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
2155 if (Loop *L = LI->getLoopFor(BB)) {
2156 if (L->getHeader() == BB && L->getParentLoop() == 0)
2159 printBasicBlock(BB);
2166 void CWriter::printLoop(Loop *L) {
2167 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
2168 << "' to make GCC happy */\n";
2169 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
2170 BasicBlock *BB = L->getBlocks()[i];
2171 Loop *BBLoop = LI->getLoopFor(BB);
2173 printBasicBlock(BB);
2174 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
2177 Out << " } while (1); /* end of syntactic loop '"
2178 << L->getHeader()->getName() << "' */\n";
2181 void CWriter::printBasicBlock(BasicBlock *BB) {
2183 // Don't print the label for the basic block if there are no uses, or if
2184 // the only terminator use is the predecessor basic block's terminator.
2185 // We have to scan the use list because PHI nodes use basic blocks too but
2186 // do not require a label to be generated.
2188 bool NeedsLabel = false;
2189 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
2190 if (isGotoCodeNecessary(*PI, BB)) {
2195 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2197 // Output all of the instructions in the basic block...
2198 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2200 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2201 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
2205 writeInstComputationInline(*II);
2210 // Don't emit prefix or suffix for the terminator.
2211 visit(*BB->getTerminator());
2215 // Specific Instruction type classes... note that all of the casts are
2216 // necessary because we use the instruction classes as opaque types...
2218 void CWriter::visitReturnInst(ReturnInst &I) {
2219 // If this is a struct return function, return the temporary struct.
2220 bool isStructReturn = I.getParent()->getParent()->hasStructRetAttr();
2222 if (isStructReturn) {
2223 Out << " return StructReturn;\n";
2227 // Don't output a void return if this is the last basic block in the function
2228 if (I.getNumOperands() == 0 &&
2229 &*--I.getParent()->getParent()->end() == I.getParent() &&
2230 !I.getParent()->size() == 1) {
2234 if (I.getNumOperands() > 1) {
2237 printType(Out, I.getParent()->getParent()->getReturnType());
2238 Out << " llvm_cbe_mrv_temp = {\n";
2239 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
2241 writeOperand(I.getOperand(i));
2247 Out << " return llvm_cbe_mrv_temp;\n";
2253 if (I.getNumOperands()) {
2255 writeOperand(I.getOperand(0));
2260 void CWriter::visitSwitchInst(SwitchInst &SI) {
2263 writeOperand(SI.getOperand(0));
2264 Out << ") {\n default:\n";
2265 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2266 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2268 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2270 writeOperand(SI.getOperand(i));
2272 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2273 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2274 printBranchToBlock(SI.getParent(), Succ, 2);
2275 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
2281 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2282 Out << " /*UNREACHABLE*/;\n";
2285 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2286 /// FIXME: This should be reenabled, but loop reordering safe!!
2289 if (next(Function::iterator(From)) != Function::iterator(To))
2290 return true; // Not the direct successor, we need a goto.
2292 //isa<SwitchInst>(From->getTerminator())
2294 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2299 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2300 BasicBlock *Successor,
2302 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2303 PHINode *PN = cast<PHINode>(I);
2304 // Now we have to do the printing.
2305 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2306 if (!isa<UndefValue>(IV)) {
2307 Out << std::string(Indent, ' ');
2308 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2310 Out << "; /* for PHI node */\n";
2315 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2317 if (isGotoCodeNecessary(CurBB, Succ)) {
2318 Out << std::string(Indent, ' ') << " goto ";
2324 // Branch instruction printing - Avoid printing out a branch to a basic block
2325 // that immediately succeeds the current one.
2327 void CWriter::visitBranchInst(BranchInst &I) {
2329 if (I.isConditional()) {
2330 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2332 writeOperand(I.getCondition());
2335 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2336 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2338 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2339 Out << " } else {\n";
2340 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2341 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2344 // First goto not necessary, assume second one is...
2346 writeOperand(I.getCondition());
2349 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2350 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2355 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2356 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2361 // PHI nodes get copied into temporary values at the end of predecessor basic
2362 // blocks. We now need to copy these temporary values into the REAL value for
2364 void CWriter::visitPHINode(PHINode &I) {
2366 Out << "__PHI_TEMPORARY";
2370 void CWriter::visitBinaryOperator(Instruction &I) {
2371 // binary instructions, shift instructions, setCond instructions.
2372 assert(!isa<PointerType>(I.getType()));
2374 // We must cast the results of binary operations which might be promoted.
2375 bool needsCast = false;
2376 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2377 || (I.getType() == Type::FloatTy)) {
2380 printType(Out, I.getType(), false);
2384 // If this is a negation operation, print it out as such. For FP, we don't
2385 // want to print "-0.0 - X".
2386 if (BinaryOperator::isNeg(&I)) {
2388 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2390 } else if (I.getOpcode() == Instruction::FRem) {
2391 // Output a call to fmod/fmodf instead of emitting a%b
2392 if (I.getType() == Type::FloatTy)
2394 else if (I.getType() == Type::DoubleTy)
2396 else // all 3 flavors of long double
2398 writeOperand(I.getOperand(0));
2400 writeOperand(I.getOperand(1));
2404 // Write out the cast of the instruction's value back to the proper type
2406 bool NeedsClosingParens = writeInstructionCast(I);
2408 // Certain instructions require the operand to be forced to a specific type
2409 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2410 // below for operand 1
2411 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2413 switch (I.getOpcode()) {
2414 case Instruction::Add: Out << " + "; break;
2415 case Instruction::Sub: Out << " - "; break;
2416 case Instruction::Mul: Out << " * "; break;
2417 case Instruction::URem:
2418 case Instruction::SRem:
2419 case Instruction::FRem: Out << " % "; break;
2420 case Instruction::UDiv:
2421 case Instruction::SDiv:
2422 case Instruction::FDiv: Out << " / "; break;
2423 case Instruction::And: Out << " & "; break;
2424 case Instruction::Or: Out << " | "; break;
2425 case Instruction::Xor: Out << " ^ "; break;
2426 case Instruction::Shl : Out << " << "; break;
2427 case Instruction::LShr:
2428 case Instruction::AShr: Out << " >> "; break;
2429 default: cerr << "Invalid operator type!" << I; abort();
2432 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2433 if (NeedsClosingParens)
2442 void CWriter::visitICmpInst(ICmpInst &I) {
2443 // We must cast the results of icmp which might be promoted.
2444 bool needsCast = false;
2446 // Write out the cast of the instruction's value back to the proper type
2448 bool NeedsClosingParens = writeInstructionCast(I);
2450 // Certain icmp predicate require the operand to be forced to a specific type
2451 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2452 // below for operand 1
2453 writeOperandWithCast(I.getOperand(0), I);
2455 switch (I.getPredicate()) {
2456 case ICmpInst::ICMP_EQ: Out << " == "; break;
2457 case ICmpInst::ICMP_NE: Out << " != "; break;
2458 case ICmpInst::ICMP_ULE:
2459 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2460 case ICmpInst::ICMP_UGE:
2461 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2462 case ICmpInst::ICMP_ULT:
2463 case ICmpInst::ICMP_SLT: Out << " < "; break;
2464 case ICmpInst::ICMP_UGT:
2465 case ICmpInst::ICMP_SGT: Out << " > "; break;
2466 default: cerr << "Invalid icmp predicate!" << I; abort();
2469 writeOperandWithCast(I.getOperand(1), I);
2470 if (NeedsClosingParens)
2478 void CWriter::visitFCmpInst(FCmpInst &I) {
2479 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2483 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2489 switch (I.getPredicate()) {
2490 default: assert(0 && "Illegal FCmp predicate");
2491 case FCmpInst::FCMP_ORD: op = "ord"; break;
2492 case FCmpInst::FCMP_UNO: op = "uno"; break;
2493 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2494 case FCmpInst::FCMP_UNE: op = "une"; break;
2495 case FCmpInst::FCMP_ULT: op = "ult"; break;
2496 case FCmpInst::FCMP_ULE: op = "ule"; break;
2497 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2498 case FCmpInst::FCMP_UGE: op = "uge"; break;
2499 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2500 case FCmpInst::FCMP_ONE: op = "one"; break;
2501 case FCmpInst::FCMP_OLT: op = "olt"; break;
2502 case FCmpInst::FCMP_OLE: op = "ole"; break;
2503 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2504 case FCmpInst::FCMP_OGE: op = "oge"; break;
2507 Out << "llvm_fcmp_" << op << "(";
2508 // Write the first operand
2509 writeOperand(I.getOperand(0));
2511 // Write the second operand
2512 writeOperand(I.getOperand(1));
2516 static const char * getFloatBitCastField(const Type *Ty) {
2517 switch (Ty->getTypeID()) {
2518 default: assert(0 && "Invalid Type");
2519 case Type::FloatTyID: return "Float";
2520 case Type::DoubleTyID: return "Double";
2521 case Type::IntegerTyID: {
2522 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2531 void CWriter::visitCastInst(CastInst &I) {
2532 const Type *DstTy = I.getType();
2533 const Type *SrcTy = I.getOperand(0)->getType();
2534 if (isFPIntBitCast(I)) {
2536 // These int<->float and long<->double casts need to be handled specially
2537 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2538 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2539 writeOperand(I.getOperand(0));
2540 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2541 << getFloatBitCastField(I.getType());
2547 printCast(I.getOpcode(), SrcTy, DstTy);
2549 // Make a sext from i1 work by subtracting the i1 from 0 (an int).
2550 if (SrcTy == Type::Int1Ty && I.getOpcode() == Instruction::SExt)
2553 writeOperand(I.getOperand(0));
2555 if (DstTy == Type::Int1Ty &&
2556 (I.getOpcode() == Instruction::Trunc ||
2557 I.getOpcode() == Instruction::FPToUI ||
2558 I.getOpcode() == Instruction::FPToSI ||
2559 I.getOpcode() == Instruction::PtrToInt)) {
2560 // Make sure we really get a trunc to bool by anding the operand with 1
2566 void CWriter::visitSelectInst(SelectInst &I) {
2568 writeOperand(I.getCondition());
2570 writeOperand(I.getTrueValue());
2572 writeOperand(I.getFalseValue());
2577 void CWriter::lowerIntrinsics(Function &F) {
2578 // This is used to keep track of intrinsics that get generated to a lowered
2579 // function. We must generate the prototypes before the function body which
2580 // will only be expanded on first use (by the loop below).
2581 std::vector<Function*> prototypesToGen;
2583 // Examine all the instructions in this function to find the intrinsics that
2584 // need to be lowered.
2585 for (Function::iterator BB = F.begin(), EE = F.end(); BB != EE; ++BB)
2586 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2587 if (CallInst *CI = dyn_cast<CallInst>(I++))
2588 if (Function *F = CI->getCalledFunction())
2589 switch (F->getIntrinsicID()) {
2590 case Intrinsic::not_intrinsic:
2591 case Intrinsic::memory_barrier:
2592 case Intrinsic::vastart:
2593 case Intrinsic::vacopy:
2594 case Intrinsic::vaend:
2595 case Intrinsic::returnaddress:
2596 case Intrinsic::frameaddress:
2597 case Intrinsic::setjmp:
2598 case Intrinsic::longjmp:
2599 case Intrinsic::prefetch:
2600 case Intrinsic::dbg_stoppoint:
2601 case Intrinsic::powi:
2602 case Intrinsic::x86_sse_cmp_ss:
2603 case Intrinsic::x86_sse_cmp_ps:
2604 case Intrinsic::x86_sse2_cmp_sd:
2605 case Intrinsic::x86_sse2_cmp_pd:
2606 case Intrinsic::ppc_altivec_lvsl:
2607 // We directly implement these intrinsics
2610 // If this is an intrinsic that directly corresponds to a GCC
2611 // builtin, we handle it.
2612 const char *BuiltinName = "";
2613 #define GET_GCC_BUILTIN_NAME
2614 #include "llvm/Intrinsics.gen"
2615 #undef GET_GCC_BUILTIN_NAME
2616 // If we handle it, don't lower it.
2617 if (BuiltinName[0]) break;
2619 // All other intrinsic calls we must lower.
2620 Instruction *Before = 0;
2621 if (CI != &BB->front())
2622 Before = prior(BasicBlock::iterator(CI));
2624 IL->LowerIntrinsicCall(CI);
2625 if (Before) { // Move iterator to instruction after call
2630 // If the intrinsic got lowered to another call, and that call has
2631 // a definition then we need to make sure its prototype is emitted
2632 // before any calls to it.
2633 if (CallInst *Call = dyn_cast<CallInst>(I))
2634 if (Function *NewF = Call->getCalledFunction())
2635 if (!NewF->isDeclaration())
2636 prototypesToGen.push_back(NewF);
2641 // We may have collected some prototypes to emit in the loop above.
2642 // Emit them now, before the function that uses them is emitted. But,
2643 // be careful not to emit them twice.
2644 std::vector<Function*>::iterator I = prototypesToGen.begin();
2645 std::vector<Function*>::iterator E = prototypesToGen.end();
2646 for ( ; I != E; ++I) {
2647 if (intrinsicPrototypesAlreadyGenerated.insert(*I).second) {
2649 printFunctionSignature(*I, true);
2655 void CWriter::visitCallInst(CallInst &I) {
2656 if (isa<InlineAsm>(I.getOperand(0)))
2657 return visitInlineAsm(I);
2659 bool WroteCallee = false;
2661 // Handle intrinsic function calls first...
2662 if (Function *F = I.getCalledFunction())
2663 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
2664 if (visitBuiltinCall(I, ID, WroteCallee))
2667 Value *Callee = I.getCalledValue();
2669 const PointerType *PTy = cast<PointerType>(Callee->getType());
2670 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2672 // If this is a call to a struct-return function, assign to the first
2673 // parameter instead of passing it to the call.
2674 const PAListPtr &PAL = I.getParamAttrs();
2675 bool hasByVal = I.hasByValArgument();
2676 bool isStructRet = I.hasStructRetAttr();
2678 writeOperandDeref(I.getOperand(1));
2682 if (I.isTailCall()) Out << " /*tail*/ ";
2685 // If this is an indirect call to a struct return function, we need to cast
2686 // the pointer. Ditto for indirect calls with byval arguments.
2687 bool NeedsCast = (hasByVal || isStructRet) && !isa<Function>(Callee);
2689 // GCC is a real PITA. It does not permit codegening casts of functions to
2690 // function pointers if they are in a call (it generates a trap instruction
2691 // instead!). We work around this by inserting a cast to void* in between
2692 // the function and the function pointer cast. Unfortunately, we can't just
2693 // form the constant expression here, because the folder will immediately
2696 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2697 // that void* and function pointers have the same size. :( To deal with this
2698 // in the common case, we handle casts where the number of arguments passed
2701 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2703 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2709 // Ok, just cast the pointer type.
2712 printStructReturnPointerFunctionType(Out, PAL,
2713 cast<PointerType>(I.getCalledValue()->getType()));
2715 printType(Out, I.getCalledValue()->getType(), false, "", true, PAL);
2717 printType(Out, I.getCalledValue()->getType());
2720 writeOperand(Callee);
2721 if (NeedsCast) Out << ')';
2726 unsigned NumDeclaredParams = FTy->getNumParams();
2728 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2730 if (isStructRet) { // Skip struct return argument.
2735 bool PrintedArg = false;
2736 for (; AI != AE; ++AI, ++ArgNo) {
2737 if (PrintedArg) Out << ", ";
2738 if (ArgNo < NumDeclaredParams &&
2739 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2741 printType(Out, FTy->getParamType(ArgNo),
2742 /*isSigned=*/PAL.paramHasAttr(ArgNo+1, ParamAttr::SExt));
2745 // Check if the argument is expected to be passed by value.
2746 if (I.paramHasAttr(ArgNo+1, ParamAttr::ByVal))
2747 writeOperandDeref(*AI);
2755 /// visitBuiltinCall - Handle the call to the specified builtin. Returns true
2756 /// if the entire call is handled, return false it it wasn't handled, and
2757 /// optionally set 'WroteCallee' if the callee has already been printed out.
2758 bool CWriter::visitBuiltinCall(CallInst &I, Intrinsic::ID ID,
2759 bool &WroteCallee) {
2762 // If this is an intrinsic that directly corresponds to a GCC
2763 // builtin, we emit it here.
2764 const char *BuiltinName = "";
2765 Function *F = I.getCalledFunction();
2766 #define GET_GCC_BUILTIN_NAME
2767 #include "llvm/Intrinsics.gen"
2768 #undef GET_GCC_BUILTIN_NAME
2769 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2775 case Intrinsic::memory_barrier:
2776 Out << "__sync_synchronize()";
2778 case Intrinsic::vastart:
2781 Out << "va_start(*(va_list*)";
2782 writeOperand(I.getOperand(1));
2784 // Output the last argument to the enclosing function.
2785 if (I.getParent()->getParent()->arg_empty()) {
2786 cerr << "The C backend does not currently support zero "
2787 << "argument varargs functions, such as '"
2788 << I.getParent()->getParent()->getName() << "'!\n";
2791 writeOperand(--I.getParent()->getParent()->arg_end());
2794 case Intrinsic::vaend:
2795 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2796 Out << "0; va_end(*(va_list*)";
2797 writeOperand(I.getOperand(1));
2800 Out << "va_end(*(va_list*)0)";
2803 case Intrinsic::vacopy:
2805 Out << "va_copy(*(va_list*)";
2806 writeOperand(I.getOperand(1));
2807 Out << ", *(va_list*)";
2808 writeOperand(I.getOperand(2));
2811 case Intrinsic::returnaddress:
2812 Out << "__builtin_return_address(";
2813 writeOperand(I.getOperand(1));
2816 case Intrinsic::frameaddress:
2817 Out << "__builtin_frame_address(";
2818 writeOperand(I.getOperand(1));
2821 case Intrinsic::powi:
2822 Out << "__builtin_powi(";
2823 writeOperand(I.getOperand(1));
2825 writeOperand(I.getOperand(2));
2828 case Intrinsic::setjmp:
2829 Out << "setjmp(*(jmp_buf*)";
2830 writeOperand(I.getOperand(1));
2833 case Intrinsic::longjmp:
2834 Out << "longjmp(*(jmp_buf*)";
2835 writeOperand(I.getOperand(1));
2837 writeOperand(I.getOperand(2));
2840 case Intrinsic::prefetch:
2841 Out << "LLVM_PREFETCH((const void *)";
2842 writeOperand(I.getOperand(1));
2844 writeOperand(I.getOperand(2));
2846 writeOperand(I.getOperand(3));
2849 case Intrinsic::stacksave:
2850 // Emit this as: Val = 0; *((void**)&Val) = __builtin_stack_save()
2851 // to work around GCC bugs (see PR1809).
2852 Out << "0; *((void**)&" << GetValueName(&I)
2853 << ") = __builtin_stack_save()";
2855 case Intrinsic::dbg_stoppoint: {
2856 // If we use writeOperand directly we get a "u" suffix which is rejected
2858 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2861 << " \"" << SPI.getDirectory()
2862 << SPI.getFileName() << "\"\n";
2865 case Intrinsic::x86_sse_cmp_ss:
2866 case Intrinsic::x86_sse_cmp_ps:
2867 case Intrinsic::x86_sse2_cmp_sd:
2868 case Intrinsic::x86_sse2_cmp_pd:
2870 printType(Out, I.getType());
2872 // Multiple GCC builtins multiplex onto this intrinsic.
2873 switch (cast<ConstantInt>(I.getOperand(3))->getZExtValue()) {
2874 default: assert(0 && "Invalid llvm.x86.sse.cmp!");
2875 case 0: Out << "__builtin_ia32_cmpeq"; break;
2876 case 1: Out << "__builtin_ia32_cmplt"; break;
2877 case 2: Out << "__builtin_ia32_cmple"; break;
2878 case 3: Out << "__builtin_ia32_cmpunord"; break;
2879 case 4: Out << "__builtin_ia32_cmpneq"; break;
2880 case 5: Out << "__builtin_ia32_cmpnlt"; break;
2881 case 6: Out << "__builtin_ia32_cmpnle"; break;
2882 case 7: Out << "__builtin_ia32_cmpord"; break;
2884 if (ID == Intrinsic::x86_sse_cmp_ps || ID == Intrinsic::x86_sse2_cmp_pd)
2888 if (ID == Intrinsic::x86_sse_cmp_ss || ID == Intrinsic::x86_sse_cmp_ps)
2894 writeOperand(I.getOperand(1));
2896 writeOperand(I.getOperand(2));
2899 case Intrinsic::ppc_altivec_lvsl:
2901 printType(Out, I.getType());
2903 Out << "__builtin_altivec_lvsl(0, (void*)";
2904 writeOperand(I.getOperand(1));
2910 //This converts the llvm constraint string to something gcc is expecting.
2911 //TODO: work out platform independent constraints and factor those out
2912 // of the per target tables
2913 // handle multiple constraint codes
2914 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2916 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2918 const char *const *table = 0;
2920 //Grab the translation table from TargetAsmInfo if it exists
2923 const TargetMachineRegistry::entry* Match =
2924 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2926 //Per platform Target Machines don't exist, so create it
2927 // this must be done only once
2928 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2929 TAsm = TM->getTargetAsmInfo();
2933 table = TAsm->getAsmCBE();
2935 //Search the translation table if it exists
2936 for (int i = 0; table && table[i]; i += 2)
2937 if (c.Codes[0] == table[i])
2940 //default is identity
2944 //TODO: import logic from AsmPrinter.cpp
2945 static std::string gccifyAsm(std::string asmstr) {
2946 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2947 if (asmstr[i] == '\n')
2948 asmstr.replace(i, 1, "\\n");
2949 else if (asmstr[i] == '\t')
2950 asmstr.replace(i, 1, "\\t");
2951 else if (asmstr[i] == '$') {
2952 if (asmstr[i + 1] == '{') {
2953 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2954 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2955 std::string n = "%" +
2956 asmstr.substr(a + 1, b - a - 1) +
2957 asmstr.substr(i + 2, a - i - 2);
2958 asmstr.replace(i, b - i + 1, n);
2961 asmstr.replace(i, 1, "%");
2963 else if (asmstr[i] == '%')//grr
2964 { asmstr.replace(i, 1, "%%"); ++i;}
2969 //TODO: assumptions about what consume arguments from the call are likely wrong
2970 // handle communitivity
2971 void CWriter::visitInlineAsm(CallInst &CI) {
2972 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2973 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2975 std::vector<std::pair<Value*, int> > ResultVals;
2976 if (CI.getType() == Type::VoidTy)
2978 else if (const StructType *ST = dyn_cast<StructType>(CI.getType())) {
2979 for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i)
2980 ResultVals.push_back(std::make_pair(&CI, (int)i));
2982 ResultVals.push_back(std::make_pair(&CI, -1));
2985 // Fix up the asm string for gcc and emit it.
2986 Out << "__asm__ volatile (\"" << gccifyAsm(as->getAsmString()) << "\"\n";
2989 unsigned ValueCount = 0;
2990 bool IsFirst = true;
2992 // Convert over all the output constraints.
2993 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2994 E = Constraints.end(); I != E; ++I) {
2996 if (I->Type != InlineAsm::isOutput) {
2998 continue; // Ignore non-output constraints.
3001 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3002 std::string C = InterpretASMConstraint(*I);
3003 if (C.empty()) continue;
3014 if (ValueCount < ResultVals.size()) {
3015 DestVal = ResultVals[ValueCount].first;
3016 DestValNo = ResultVals[ValueCount].second;
3018 DestVal = CI.getOperand(ValueCount-ResultVals.size()+1);
3020 if (I->isEarlyClobber)
3023 Out << "\"=" << C << "\"(" << GetValueName(DestVal);
3024 if (DestValNo != -1)
3025 Out << ".field" << DestValNo; // Multiple retvals.
3031 // Convert over all the input constraints.
3035 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3036 E = Constraints.end(); I != E; ++I) {
3037 if (I->Type != InlineAsm::isInput) {
3039 continue; // Ignore non-input constraints.
3042 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3043 std::string C = InterpretASMConstraint(*I);
3044 if (C.empty()) continue;
3051 assert(ValueCount >= ResultVals.size() && "Input can't refer to result");
3052 Value *SrcVal = CI.getOperand(ValueCount-ResultVals.size()+1);
3054 Out << "\"" << C << "\"(";
3056 writeOperand(SrcVal);
3058 writeOperandDeref(SrcVal);
3062 // Convert over the clobber constraints.
3065 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3066 E = Constraints.end(); I != E; ++I) {
3067 if (I->Type != InlineAsm::isClobber)
3068 continue; // Ignore non-input constraints.
3070 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3071 std::string C = InterpretASMConstraint(*I);
3072 if (C.empty()) continue;
3079 Out << '\"' << C << '"';
3085 void CWriter::visitMallocInst(MallocInst &I) {
3086 assert(0 && "lowerallocations pass didn't work!");
3089 void CWriter::visitAllocaInst(AllocaInst &I) {
3091 printType(Out, I.getType());
3092 Out << ") alloca(sizeof(";
3093 printType(Out, I.getType()->getElementType());
3095 if (I.isArrayAllocation()) {
3097 writeOperand(I.getOperand(0));
3102 void CWriter::visitFreeInst(FreeInst &I) {
3103 assert(0 && "lowerallocations pass didn't work!");
3106 void CWriter::printGEPExpression(Value *Ptr, gep_type_iterator I,
3107 gep_type_iterator E) {
3109 // If there are no indices, just print out the pointer.
3115 // Find out if the last index is into a vector. If so, we have to print this
3116 // specially. Since vectors can't have elements of indexable type, only the
3117 // last index could possibly be of a vector element.
3118 const VectorType *LastIndexIsVector = 0;
3120 for (gep_type_iterator TmpI = I; TmpI != E; ++TmpI)
3121 LastIndexIsVector = dyn_cast<VectorType>(*TmpI);
3126 // If the last index is into a vector, we can't print it as &a[i][j] because
3127 // we can't index into a vector with j in GCC. Instead, emit this as
3128 // (((float*)&a[i])+j)
3129 if (LastIndexIsVector) {
3131 printType(Out, PointerType::getUnqual(LastIndexIsVector->getElementType()));
3137 // If the first index is 0 (very typical) we can do a number of
3138 // simplifications to clean up the code.
3139 Value *FirstOp = I.getOperand();
3140 if (!isa<Constant>(FirstOp) || !cast<Constant>(FirstOp)->isNullValue()) {
3141 // First index isn't simple, print it the hard way.
3144 ++I; // Skip the zero index.
3146 // Okay, emit the first operand. If Ptr is something that is already address
3147 // exposed, like a global, avoid emitting (&foo)[0], just emit foo instead.
3148 if (isAddressExposed(Ptr)) {
3149 writeOperandInternal(Ptr);
3150 } else if (I != E && isa<StructType>(*I)) {
3151 // If we didn't already emit the first operand, see if we can print it as
3152 // P->f instead of "P[0].f"
3154 Out << "->field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3155 ++I; // eat the struct index as well.
3157 // Instead of emitting P[0][1], emit (*P)[1], which is more idiomatic.
3164 for (; I != E; ++I) {
3165 if (isa<StructType>(*I)) {
3166 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3167 } else if (isa<ArrayType>(*I)) {
3169 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3171 } else if (!isa<VectorType>(*I)) {
3173 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3176 // If the last index is into a vector, then print it out as "+j)". This
3177 // works with the 'LastIndexIsVector' code above.
3178 if (isa<Constant>(I.getOperand()) &&
3179 cast<Constant>(I.getOperand())->isNullValue()) {
3180 Out << "))"; // avoid "+0".
3183 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3191 void CWriter::writeMemoryAccess(Value *Operand, const Type *OperandType,
3192 bool IsVolatile, unsigned Alignment) {
3194 bool IsUnaligned = Alignment &&
3195 Alignment < TD->getABITypeAlignment(OperandType);
3199 if (IsVolatile || IsUnaligned) {
3202 Out << "struct __attribute__ ((packed, aligned(" << Alignment << "))) {";
3203 printType(Out, OperandType, false, IsUnaligned ? "data" : "volatile*");
3206 if (IsVolatile) Out << "volatile ";
3212 writeOperand(Operand);
3214 if (IsVolatile || IsUnaligned) {
3221 void CWriter::visitLoadInst(LoadInst &I) {
3222 writeMemoryAccess(I.getOperand(0), I.getType(), I.isVolatile(),
3227 void CWriter::visitStoreInst(StoreInst &I) {
3228 writeMemoryAccess(I.getPointerOperand(), I.getOperand(0)->getType(),
3229 I.isVolatile(), I.getAlignment());
3231 Value *Operand = I.getOperand(0);
3232 Constant *BitMask = 0;
3233 if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
3234 if (!ITy->isPowerOf2ByteWidth())
3235 // We have a bit width that doesn't match an even power-of-2 byte
3236 // size. Consequently we must & the value with the type's bit mask
3237 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
3240 writeOperand(Operand);
3243 printConstant(BitMask);
3248 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
3249 printGEPExpression(I.getPointerOperand(), gep_type_begin(I),
3253 void CWriter::visitVAArgInst(VAArgInst &I) {
3254 Out << "va_arg(*(va_list*)";
3255 writeOperand(I.getOperand(0));
3257 printType(Out, I.getType());
3261 void CWriter::visitInsertElementInst(InsertElementInst &I) {
3262 const Type *EltTy = I.getType()->getElementType();
3263 writeOperand(I.getOperand(0));
3266 printType(Out, PointerType::getUnqual(EltTy));
3267 Out << ")(&" << GetValueName(&I) << "))[";
3268 writeOperand(I.getOperand(2));
3270 writeOperand(I.getOperand(1));
3274 void CWriter::visitExtractElementInst(ExtractElementInst &I) {
3275 // We know that our operand is not inlined.
3278 cast<VectorType>(I.getOperand(0)->getType())->getElementType();
3279 printType(Out, PointerType::getUnqual(EltTy));
3280 Out << ")(&" << GetValueName(I.getOperand(0)) << "))[";
3281 writeOperand(I.getOperand(1));
3285 void CWriter::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
3287 printType(Out, SVI.getType());
3289 const VectorType *VT = SVI.getType();
3290 unsigned NumElts = VT->getNumElements();
3291 const Type *EltTy = VT->getElementType();
3293 for (unsigned i = 0; i != NumElts; ++i) {
3295 int SrcVal = SVI.getMaskValue(i);
3296 if ((unsigned)SrcVal >= NumElts*2) {
3297 Out << " 0/*undef*/ ";
3299 Value *Op = SVI.getOperand((unsigned)SrcVal >= NumElts);
3300 if (isa<Instruction>(Op)) {
3301 // Do an extractelement of this value from the appropriate input.
3303 printType(Out, PointerType::getUnqual(EltTy));
3304 Out << ")(&" << GetValueName(Op)
3305 << "))[" << (SrcVal & (NumElts-1)) << "]";
3306 } else if (isa<ConstantAggregateZero>(Op) || isa<UndefValue>(Op)) {
3309 printConstant(cast<ConstantVector>(Op)->getOperand(SrcVal &
3317 void CWriter::visitGetResultInst(GetResultInst &GRI) {
3319 if (isa<UndefValue>(GRI.getOperand(0))) {
3321 printType(Out, GRI.getType());
3322 Out << ") 0/*UNDEF*/";
3324 Out << GetValueName(GRI.getOperand(0)) << ".field" << GRI.getIndex();
3329 void CWriter::visitInsertValueInst(InsertValueInst &IVI) {
3330 // Start by copying the entire aggregate value into the result variable.
3331 writeOperand(IVI.getOperand(0));
3334 // Then do the insert to update the field.
3335 Out << GetValueName(&IVI);
3336 for (const unsigned *b = IVI.idx_begin(), *i = b, *e = IVI.idx_end();
3338 const Type *IndexedTy =
3339 ExtractValueInst::getIndexedType(IVI.getOperand(0)->getType(), b, i+1);
3340 if (isa<ArrayType>(IndexedTy))
3341 Out << ".array[" << *i << "]";
3343 Out << ".field" << *i;
3346 writeOperand(IVI.getOperand(1));
3349 void CWriter::visitExtractValueInst(ExtractValueInst &EVI) {
3351 if (isa<UndefValue>(EVI.getOperand(0))) {
3353 printType(Out, EVI.getType());
3354 Out << ") 0/*UNDEF*/";
3356 Out << GetValueName(EVI.getOperand(0));
3357 for (const unsigned *b = EVI.idx_begin(), *i = b, *e = EVI.idx_end();
3359 const Type *IndexedTy =
3360 ExtractValueInst::getIndexedType(EVI.getOperand(0)->getType(), b, i+1);
3361 if (isa<ArrayType>(IndexedTy))
3362 Out << ".array[" << *i << "]";
3364 Out << ".field" << *i;
3370 //===----------------------------------------------------------------------===//
3371 // External Interface declaration
3372 //===----------------------------------------------------------------------===//
3374 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
3376 CodeGenFileType FileType,
3378 if (FileType != TargetMachine::AssemblyFile) return true;
3380 PM.add(createGCLoweringPass());
3381 PM.add(createLowerAllocationsPass(true));
3382 PM.add(createLowerInvokePass());
3383 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
3384 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
3385 PM.add(new CWriter(o));
3386 PM.add(createCollectorMetadataDeleter());