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/Intrinsics.h"
24 #include "llvm/IntrinsicInst.h"
25 #include "llvm/InlineAsm.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/ADT/SmallString.h"
28 #include "llvm/ADT/STLExtras.h"
29 #include "llvm/Analysis/ConstantsScanner.h"
30 #include "llvm/Analysis/FindUsedTypes.h"
31 #include "llvm/Analysis/LoopInfo.h"
32 #include "llvm/Analysis/ValueTracking.h"
33 #include "llvm/CodeGen/Passes.h"
34 #include "llvm/CodeGen/IntrinsicLowering.h"
35 #include "llvm/Target/Mangler.h"
36 #include "llvm/Transforms/Scalar.h"
37 #include "llvm/MC/MCAsmInfo.h"
38 #include "llvm/MC/MCContext.h"
39 #include "llvm/MC/MCInstrInfo.h"
40 #include "llvm/MC/MCRegisterInfo.h"
41 #include "llvm/MC/MCSubtargetInfo.h"
42 #include "llvm/MC/MCSymbol.h"
43 #include "llvm/Target/TargetData.h"
44 #include "llvm/Target/TargetRegistry.h"
45 #include "llvm/Support/CallSite.h"
46 #include "llvm/Support/CFG.h"
47 #include "llvm/Support/ErrorHandling.h"
48 #include "llvm/Support/FormattedStream.h"
49 #include "llvm/Support/GetElementPtrTypeIterator.h"
50 #include "llvm/Support/InstVisitor.h"
51 #include "llvm/Support/MathExtras.h"
52 #include "llvm/Support/Host.h"
53 #include "llvm/Config/config.h"
55 // Some ms header decided to define setjmp as _setjmp, undo this for this file.
61 extern "C" void LLVMInitializeCBackendTarget() {
62 // Register the target.
63 RegisterTargetMachine<CTargetMachine> X(TheCBackendTarget);
66 extern "C" void LLVMInitializeCBackendMCAsmInfo() {}
68 extern "C" void LLVMInitializeCBackendMCRegisterInfo() {}
70 extern "C" void LLVMInitializeCBackendMCInstrInfo() {}
72 extern "C" void LLVMInitializeCBackendMCSubtargetInfo() {}
74 extern "C" void LLVMInitializeCBackendMCCodeGenInfo() {}
77 class CBEMCAsmInfo : public MCAsmInfo {
81 PrivateGlobalPrefix = "";
85 /// CWriter - This class is the main chunk of code that converts an LLVM
86 /// module to a C translation unit.
87 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
88 formatted_raw_ostream &Out;
89 IntrinsicLowering *IL;
92 const Module *TheModule;
93 const MCAsmInfo* TAsm;
94 const MCRegisterInfo *MRI;
98 std::map<const ConstantFP *, unsigned> FPConstantMap;
99 std::set<Function*> intrinsicPrototypesAlreadyGenerated;
100 std::set<const Argument*> ByValParams;
102 unsigned OpaqueCounter;
103 DenseMap<const Value*, unsigned> AnonValueNumbers;
104 unsigned NextAnonValueNumber;
106 /// UnnamedStructIDs - This contains a unique ID for each struct that is
107 /// either anonymous or has no name.
108 DenseMap<StructType*, unsigned> UnnamedStructIDs;
112 explicit CWriter(formatted_raw_ostream &o)
113 : FunctionPass(ID), Out(o), IL(0), Mang(0), LI(0),
114 TheModule(0), TAsm(0), MRI(0), TCtx(0), TD(0), OpaqueCounter(0),
115 NextAnonValueNumber(0) {
116 initializeLoopInfoPass(*PassRegistry::getPassRegistry());
120 virtual const char *getPassName() const { return "C backend"; }
122 void getAnalysisUsage(AnalysisUsage &AU) const {
123 AU.addRequired<LoopInfo>();
124 AU.setPreservesAll();
127 virtual bool doInitialization(Module &M);
129 bool runOnFunction(Function &F) {
130 // Do not codegen any 'available_externally' functions at all, they have
131 // definitions outside the translation unit.
132 if (F.hasAvailableExternallyLinkage())
135 LI = &getAnalysis<LoopInfo>();
137 // Get rid of intrinsics we can't handle.
140 // Output all floating point constants that cannot be printed accurately.
141 printFloatingPointConstants(F);
147 virtual bool doFinalization(Module &M) {
155 FPConstantMap.clear();
157 intrinsicPrototypesAlreadyGenerated.clear();
158 UnnamedStructIDs.clear();
162 raw_ostream &printType(raw_ostream &Out, Type *Ty,
163 bool isSigned = false,
164 const std::string &VariableName = "",
165 bool IgnoreName = false,
166 const AttrListPtr &PAL = AttrListPtr());
167 raw_ostream &printSimpleType(raw_ostream &Out, Type *Ty,
169 const std::string &NameSoFar = "");
171 void printStructReturnPointerFunctionType(raw_ostream &Out,
172 const AttrListPtr &PAL,
175 std::string getStructName(StructType *ST);
177 /// writeOperandDeref - Print the result of dereferencing the specified
178 /// operand with '*'. This is equivalent to printing '*' then using
179 /// writeOperand, but avoids excess syntax in some cases.
180 void writeOperandDeref(Value *Operand) {
181 if (isAddressExposed(Operand)) {
182 // Already something with an address exposed.
183 writeOperandInternal(Operand);
186 writeOperand(Operand);
191 void writeOperand(Value *Operand, bool Static = false);
192 void writeInstComputationInline(Instruction &I);
193 void writeOperandInternal(Value *Operand, bool Static = false);
194 void writeOperandWithCast(Value* Operand, unsigned Opcode);
195 void writeOperandWithCast(Value* Operand, const ICmpInst &I);
196 bool writeInstructionCast(const Instruction &I);
198 void writeMemoryAccess(Value *Operand, Type *OperandType,
199 bool IsVolatile, unsigned Alignment);
202 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
204 void lowerIntrinsics(Function &F);
205 /// Prints the definition of the intrinsic function F. Supports the
206 /// intrinsics which need to be explicitly defined in the CBackend.
207 void printIntrinsicDefinition(const Function &F, raw_ostream &Out);
209 void printModuleTypes();
210 void printContainedStructs(Type *Ty, SmallPtrSet<Type *, 16> &);
211 void printFloatingPointConstants(Function &F);
212 void printFloatingPointConstants(const Constant *C);
213 void printFunctionSignature(const Function *F, bool Prototype);
215 void printFunction(Function &);
216 void printBasicBlock(BasicBlock *BB);
217 void printLoop(Loop *L);
219 void printCast(unsigned opcode, Type *SrcTy, Type *DstTy);
220 void printConstant(Constant *CPV, bool Static);
221 void printConstantWithCast(Constant *CPV, unsigned Opcode);
222 bool printConstExprCast(const ConstantExpr *CE, bool Static);
223 void printConstantArray(ConstantArray *CPA, bool Static);
224 void printConstantVector(ConstantVector *CV, bool Static);
226 /// isAddressExposed - Return true if the specified value's name needs to
227 /// have its address taken in order to get a C value of the correct type.
228 /// This happens for global variables, byval parameters, and direct allocas.
229 bool isAddressExposed(const Value *V) const {
230 if (const Argument *A = dyn_cast<Argument>(V))
231 return ByValParams.count(A);
232 return isa<GlobalVariable>(V) || isDirectAlloca(V);
235 // isInlinableInst - Attempt to inline instructions into their uses to build
236 // trees as much as possible. To do this, we have to consistently decide
237 // what is acceptable to inline, so that variable declarations don't get
238 // printed and an extra copy of the expr is not emitted.
240 static bool isInlinableInst(const Instruction &I) {
241 // Always inline cmp instructions, even if they are shared by multiple
242 // expressions. GCC generates horrible code if we don't.
246 // Must be an expression, must be used exactly once. If it is dead, we
247 // emit it inline where it would go.
248 if (I.getType() == Type::getVoidTy(I.getContext()) || !I.hasOneUse() ||
249 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
250 isa<LoadInst>(I) || isa<VAArgInst>(I) || isa<InsertElementInst>(I) ||
251 isa<InsertValueInst>(I))
252 // Don't inline a load across a store or other bad things!
255 // Must not be used in inline asm, extractelement, or shufflevector.
257 const Instruction &User = cast<Instruction>(*I.use_back());
258 if (isInlineAsm(User) || isa<ExtractElementInst>(User) ||
259 isa<ShuffleVectorInst>(User))
263 // Only inline instruction it if it's use is in the same BB as the inst.
264 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
267 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
268 // variables which are accessed with the & operator. This causes GCC to
269 // generate significantly better code than to emit alloca calls directly.
271 static const AllocaInst *isDirectAlloca(const Value *V) {
272 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
274 if (AI->isArrayAllocation())
275 return 0; // FIXME: we can also inline fixed size array allocas!
276 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
281 // isInlineAsm - Check if the instruction is a call to an inline asm chunk.
282 static bool isInlineAsm(const Instruction& I) {
283 if (const CallInst *CI = dyn_cast<CallInst>(&I))
284 return isa<InlineAsm>(CI->getCalledValue());
288 // Instruction visitation functions
289 friend class InstVisitor<CWriter>;
291 void visitReturnInst(ReturnInst &I);
292 void visitBranchInst(BranchInst &I);
293 void visitSwitchInst(SwitchInst &I);
294 void visitIndirectBrInst(IndirectBrInst &I);
295 void visitInvokeInst(InvokeInst &I) {
296 llvm_unreachable("Lowerinvoke pass didn't work!");
299 void visitUnwindInst(UnwindInst &I) {
300 llvm_unreachable("Lowerinvoke pass didn't work!");
302 void visitUnreachableInst(UnreachableInst &I);
304 void visitPHINode(PHINode &I);
305 void visitBinaryOperator(Instruction &I);
306 void visitICmpInst(ICmpInst &I);
307 void visitFCmpInst(FCmpInst &I);
309 void visitCastInst (CastInst &I);
310 void visitSelectInst(SelectInst &I);
311 void visitCallInst (CallInst &I);
312 void visitInlineAsm(CallInst &I);
313 bool visitBuiltinCall(CallInst &I, Intrinsic::ID ID, bool &WroteCallee);
315 void visitAllocaInst(AllocaInst &I);
316 void visitLoadInst (LoadInst &I);
317 void visitStoreInst (StoreInst &I);
318 void visitGetElementPtrInst(GetElementPtrInst &I);
319 void visitVAArgInst (VAArgInst &I);
321 void visitInsertElementInst(InsertElementInst &I);
322 void visitExtractElementInst(ExtractElementInst &I);
323 void visitShuffleVectorInst(ShuffleVectorInst &SVI);
325 void visitInsertValueInst(InsertValueInst &I);
326 void visitExtractValueInst(ExtractValueInst &I);
328 void visitInstruction(Instruction &I) {
330 errs() << "C Writer does not know about " << I;
335 void outputLValue(Instruction *I) {
336 Out << " " << GetValueName(I) << " = ";
339 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
340 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
341 BasicBlock *Successor, unsigned Indent);
342 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
344 void printGEPExpression(Value *Ptr, gep_type_iterator I,
345 gep_type_iterator E, bool Static);
347 std::string GetValueName(const Value *Operand);
351 char CWriter::ID = 0;
355 static std::string CBEMangle(const std::string &S) {
358 for (unsigned i = 0, e = S.size(); i != e; ++i)
359 if (isalnum(S[i]) || S[i] == '_') {
363 Result += 'A'+(S[i]&15);
364 Result += 'A'+((S[i]>>4)&15);
370 std::string CWriter::getStructName(StructType *ST) {
371 if (!ST->isAnonymous() && !ST->getName().empty())
372 return CBEMangle("l_"+ST->getName().str());
374 return "l_unnamed_" + utostr(UnnamedStructIDs[ST]);
378 /// printStructReturnPointerFunctionType - This is like printType for a struct
379 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
380 /// print it as "Struct (*)(...)", for struct return functions.
381 void CWriter::printStructReturnPointerFunctionType(raw_ostream &Out,
382 const AttrListPtr &PAL,
383 PointerType *TheTy) {
384 FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
386 raw_string_ostream FunctionInnards(tstr);
387 FunctionInnards << " (*) (";
388 bool PrintedType = false;
390 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
391 Type *RetTy = cast<PointerType>(*I)->getElementType();
393 for (++I, ++Idx; I != E; ++I, ++Idx) {
395 FunctionInnards << ", ";
397 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
398 assert(ArgTy->isPointerTy());
399 ArgTy = cast<PointerType>(ArgTy)->getElementType();
401 printType(FunctionInnards, ArgTy,
402 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
405 if (FTy->isVarArg()) {
407 FunctionInnards << " int"; //dummy argument for empty vararg functs
408 FunctionInnards << ", ...";
409 } else if (!PrintedType) {
410 FunctionInnards << "void";
412 FunctionInnards << ')';
413 printType(Out, RetTy,
414 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
418 CWriter::printSimpleType(raw_ostream &Out, Type *Ty, bool isSigned,
419 const std::string &NameSoFar) {
420 assert((Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) &&
421 "Invalid type for printSimpleType");
422 switch (Ty->getTypeID()) {
423 case Type::VoidTyID: return Out << "void " << NameSoFar;
424 case Type::IntegerTyID: {
425 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
427 return Out << "bool " << NameSoFar;
428 else if (NumBits <= 8)
429 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
430 else if (NumBits <= 16)
431 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
432 else if (NumBits <= 32)
433 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
434 else if (NumBits <= 64)
435 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
437 assert(NumBits <= 128 && "Bit widths > 128 not implemented yet");
438 return Out << (isSigned?"llvmInt128":"llvmUInt128") << " " << NameSoFar;
441 case Type::FloatTyID: return Out << "float " << NameSoFar;
442 case Type::DoubleTyID: return Out << "double " << NameSoFar;
443 // Lacking emulation of FP80 on PPC, etc., we assume whichever of these is
444 // present matches host 'long double'.
445 case Type::X86_FP80TyID:
446 case Type::PPC_FP128TyID:
447 case Type::FP128TyID: return Out << "long double " << NameSoFar;
449 case Type::X86_MMXTyID:
450 return printSimpleType(Out, Type::getInt32Ty(Ty->getContext()), isSigned,
451 " __attribute__((vector_size(64))) " + NameSoFar);
453 case Type::VectorTyID: {
454 VectorType *VTy = cast<VectorType>(Ty);
455 return printSimpleType(Out, VTy->getElementType(), isSigned,
456 " __attribute__((vector_size(" +
457 utostr(TD->getTypeAllocSize(VTy)) + " ))) " + NameSoFar);
462 errs() << "Unknown primitive type: " << *Ty << "\n";
468 // Pass the Type* and the variable name and this prints out the variable
471 raw_ostream &CWriter::printType(raw_ostream &Out, Type *Ty,
472 bool isSigned, const std::string &NameSoFar,
473 bool IgnoreName, const AttrListPtr &PAL) {
474 if (Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) {
475 printSimpleType(Out, Ty, isSigned, NameSoFar);
479 switch (Ty->getTypeID()) {
480 case Type::FunctionTyID: {
481 FunctionType *FTy = cast<FunctionType>(Ty);
483 raw_string_ostream FunctionInnards(tstr);
484 FunctionInnards << " (" << NameSoFar << ") (";
486 for (FunctionType::param_iterator I = FTy->param_begin(),
487 E = FTy->param_end(); I != E; ++I) {
489 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
490 assert(ArgTy->isPointerTy());
491 ArgTy = cast<PointerType>(ArgTy)->getElementType();
493 if (I != FTy->param_begin())
494 FunctionInnards << ", ";
495 printType(FunctionInnards, ArgTy,
496 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
499 if (FTy->isVarArg()) {
500 if (!FTy->getNumParams())
501 FunctionInnards << " int"; //dummy argument for empty vaarg functs
502 FunctionInnards << ", ...";
503 } else if (!FTy->getNumParams()) {
504 FunctionInnards << "void";
506 FunctionInnards << ')';
507 printType(Out, FTy->getReturnType(),
508 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
511 case Type::StructTyID: {
512 StructType *STy = cast<StructType>(Ty);
514 // Check to see if the type is named.
516 return Out << getStructName(STy) << ' ' << NameSoFar;
518 Out << NameSoFar + " {\n";
520 for (StructType::element_iterator I = STy->element_begin(),
521 E = STy->element_end(); I != E; ++I) {
523 printType(Out, *I, false, "field" + utostr(Idx++));
528 Out << " __attribute__ ((packed))";
532 case Type::PointerTyID: {
533 PointerType *PTy = cast<PointerType>(Ty);
534 std::string ptrName = "*" + NameSoFar;
536 if (PTy->getElementType()->isArrayTy() ||
537 PTy->getElementType()->isVectorTy())
538 ptrName = "(" + ptrName + ")";
541 // Must be a function ptr cast!
542 return printType(Out, PTy->getElementType(), false, ptrName, true, PAL);
543 return printType(Out, PTy->getElementType(), false, ptrName);
546 case Type::ArrayTyID: {
547 ArrayType *ATy = cast<ArrayType>(Ty);
548 unsigned NumElements = ATy->getNumElements();
549 if (NumElements == 0) NumElements = 1;
550 // Arrays are wrapped in structs to allow them to have normal
551 // value semantics (avoiding the array "decay").
552 Out << NameSoFar << " { ";
553 printType(Out, ATy->getElementType(), false,
554 "array[" + utostr(NumElements) + "]");
559 llvm_unreachable("Unhandled case in getTypeProps!");
565 void CWriter::printConstantArray(ConstantArray *CPA, bool Static) {
567 // As a special case, print the array as a string if it is an array of
568 // ubytes or an array of sbytes with positive values.
570 Type *ETy = CPA->getType()->getElementType();
571 bool isString = (ETy == Type::getInt8Ty(CPA->getContext()) ||
572 ETy == Type::getInt8Ty(CPA->getContext()));
574 // Make sure the last character is a null char, as automatically added by C
575 if (isString && (CPA->getNumOperands() == 0 ||
576 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
581 // Keep track of whether the last number was a hexadecimal escape.
582 bool LastWasHex = false;
584 // Do not include the last character, which we know is null
585 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
586 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
588 // Print it out literally if it is a printable character. The only thing
589 // to be careful about is when the last letter output was a hex escape
590 // code, in which case we have to be careful not to print out hex digits
591 // explicitly (the C compiler thinks it is a continuation of the previous
592 // character, sheesh...)
594 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
596 if (C == '"' || C == '\\')
597 Out << "\\" << (char)C;
603 case '\n': Out << "\\n"; break;
604 case '\t': Out << "\\t"; break;
605 case '\r': Out << "\\r"; break;
606 case '\v': Out << "\\v"; break;
607 case '\a': Out << "\\a"; break;
608 case '\"': Out << "\\\""; break;
609 case '\'': Out << "\\\'"; break;
612 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
613 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
622 if (CPA->getNumOperands()) {
624 printConstant(cast<Constant>(CPA->getOperand(0)), Static);
625 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
627 printConstant(cast<Constant>(CPA->getOperand(i)), Static);
634 void CWriter::printConstantVector(ConstantVector *CP, bool Static) {
636 if (CP->getNumOperands()) {
638 printConstant(cast<Constant>(CP->getOperand(0)), Static);
639 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
641 printConstant(cast<Constant>(CP->getOperand(i)), Static);
647 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
648 // textually as a double (rather than as a reference to a stack-allocated
649 // variable). We decide this by converting CFP to a string and back into a
650 // double, and then checking whether the conversion results in a bit-equal
651 // double to the original value of CFP. This depends on us and the target C
652 // compiler agreeing on the conversion process (which is pretty likely since we
653 // only deal in IEEE FP).
655 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
657 // Do long doubles in hex for now.
658 if (CFP->getType() != Type::getFloatTy(CFP->getContext()) &&
659 CFP->getType() != Type::getDoubleTy(CFP->getContext()))
661 APFloat APF = APFloat(CFP->getValueAPF()); // copy
662 if (CFP->getType() == Type::getFloatTy(CFP->getContext()))
663 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &ignored);
664 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
666 sprintf(Buffer, "%a", APF.convertToDouble());
667 if (!strncmp(Buffer, "0x", 2) ||
668 !strncmp(Buffer, "-0x", 3) ||
669 !strncmp(Buffer, "+0x", 3))
670 return APF.bitwiseIsEqual(APFloat(atof(Buffer)));
673 std::string StrVal = ftostr(APF);
675 while (StrVal[0] == ' ')
676 StrVal.erase(StrVal.begin());
678 // Check to make sure that the stringized number is not some string like "Inf"
679 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
680 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
681 ((StrVal[0] == '-' || StrVal[0] == '+') &&
682 (StrVal[1] >= '0' && StrVal[1] <= '9')))
683 // Reparse stringized version!
684 return APF.bitwiseIsEqual(APFloat(atof(StrVal.c_str())));
689 /// Print out the casting for a cast operation. This does the double casting
690 /// necessary for conversion to the destination type, if necessary.
691 /// @brief Print a cast
692 void CWriter::printCast(unsigned opc, Type *SrcTy, Type *DstTy) {
693 // Print the destination type cast
695 case Instruction::UIToFP:
696 case Instruction::SIToFP:
697 case Instruction::IntToPtr:
698 case Instruction::Trunc:
699 case Instruction::BitCast:
700 case Instruction::FPExt:
701 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
703 printType(Out, DstTy);
706 case Instruction::ZExt:
707 case Instruction::PtrToInt:
708 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
710 printSimpleType(Out, DstTy, false);
713 case Instruction::SExt:
714 case Instruction::FPToSI: // For these, make sure we get a signed dest
716 printSimpleType(Out, DstTy, true);
720 llvm_unreachable("Invalid cast opcode");
723 // Print the source type cast
725 case Instruction::UIToFP:
726 case Instruction::ZExt:
728 printSimpleType(Out, SrcTy, false);
731 case Instruction::SIToFP:
732 case Instruction::SExt:
734 printSimpleType(Out, SrcTy, true);
737 case Instruction::IntToPtr:
738 case Instruction::PtrToInt:
739 // Avoid "cast to pointer from integer of different size" warnings
740 Out << "(unsigned long)";
742 case Instruction::Trunc:
743 case Instruction::BitCast:
744 case Instruction::FPExt:
745 case Instruction::FPTrunc:
746 case Instruction::FPToSI:
747 case Instruction::FPToUI:
748 break; // These don't need a source cast.
750 llvm_unreachable("Invalid cast opcode");
755 // printConstant - The LLVM Constant to C Constant converter.
756 void CWriter::printConstant(Constant *CPV, bool Static) {
757 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
758 switch (CE->getOpcode()) {
759 case Instruction::Trunc:
760 case Instruction::ZExt:
761 case Instruction::SExt:
762 case Instruction::FPTrunc:
763 case Instruction::FPExt:
764 case Instruction::UIToFP:
765 case Instruction::SIToFP:
766 case Instruction::FPToUI:
767 case Instruction::FPToSI:
768 case Instruction::PtrToInt:
769 case Instruction::IntToPtr:
770 case Instruction::BitCast:
772 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
773 if (CE->getOpcode() == Instruction::SExt &&
774 CE->getOperand(0)->getType() == Type::getInt1Ty(CPV->getContext())) {
775 // Make sure we really sext from bool here by subtracting from 0
778 printConstant(CE->getOperand(0), Static);
779 if (CE->getType() == Type::getInt1Ty(CPV->getContext()) &&
780 (CE->getOpcode() == Instruction::Trunc ||
781 CE->getOpcode() == Instruction::FPToUI ||
782 CE->getOpcode() == Instruction::FPToSI ||
783 CE->getOpcode() == Instruction::PtrToInt)) {
784 // Make sure we really truncate to bool here by anding with 1
790 case Instruction::GetElementPtr:
792 printGEPExpression(CE->getOperand(0), gep_type_begin(CPV),
793 gep_type_end(CPV), Static);
796 case Instruction::Select:
798 printConstant(CE->getOperand(0), Static);
800 printConstant(CE->getOperand(1), Static);
802 printConstant(CE->getOperand(2), Static);
805 case Instruction::Add:
806 case Instruction::FAdd:
807 case Instruction::Sub:
808 case Instruction::FSub:
809 case Instruction::Mul:
810 case Instruction::FMul:
811 case Instruction::SDiv:
812 case Instruction::UDiv:
813 case Instruction::FDiv:
814 case Instruction::URem:
815 case Instruction::SRem:
816 case Instruction::FRem:
817 case Instruction::And:
818 case Instruction::Or:
819 case Instruction::Xor:
820 case Instruction::ICmp:
821 case Instruction::Shl:
822 case Instruction::LShr:
823 case Instruction::AShr:
826 bool NeedsClosingParens = printConstExprCast(CE, Static);
827 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
828 switch (CE->getOpcode()) {
829 case Instruction::Add:
830 case Instruction::FAdd: Out << " + "; break;
831 case Instruction::Sub:
832 case Instruction::FSub: Out << " - "; break;
833 case Instruction::Mul:
834 case Instruction::FMul: Out << " * "; break;
835 case Instruction::URem:
836 case Instruction::SRem:
837 case Instruction::FRem: Out << " % "; break;
838 case Instruction::UDiv:
839 case Instruction::SDiv:
840 case Instruction::FDiv: Out << " / "; break;
841 case Instruction::And: Out << " & "; break;
842 case Instruction::Or: Out << " | "; break;
843 case Instruction::Xor: Out << " ^ "; break;
844 case Instruction::Shl: Out << " << "; break;
845 case Instruction::LShr:
846 case Instruction::AShr: Out << " >> "; break;
847 case Instruction::ICmp:
848 switch (CE->getPredicate()) {
849 case ICmpInst::ICMP_EQ: Out << " == "; break;
850 case ICmpInst::ICMP_NE: Out << " != "; break;
851 case ICmpInst::ICMP_SLT:
852 case ICmpInst::ICMP_ULT: Out << " < "; break;
853 case ICmpInst::ICMP_SLE:
854 case ICmpInst::ICMP_ULE: Out << " <= "; break;
855 case ICmpInst::ICMP_SGT:
856 case ICmpInst::ICMP_UGT: Out << " > "; break;
857 case ICmpInst::ICMP_SGE:
858 case ICmpInst::ICMP_UGE: Out << " >= "; break;
859 default: llvm_unreachable("Illegal ICmp predicate");
862 default: llvm_unreachable("Illegal opcode here!");
864 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
865 if (NeedsClosingParens)
870 case Instruction::FCmp: {
872 bool NeedsClosingParens = printConstExprCast(CE, Static);
873 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
875 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
879 switch (CE->getPredicate()) {
880 default: llvm_unreachable("Illegal FCmp predicate");
881 case FCmpInst::FCMP_ORD: op = "ord"; break;
882 case FCmpInst::FCMP_UNO: op = "uno"; break;
883 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
884 case FCmpInst::FCMP_UNE: op = "une"; break;
885 case FCmpInst::FCMP_ULT: op = "ult"; break;
886 case FCmpInst::FCMP_ULE: op = "ule"; break;
887 case FCmpInst::FCMP_UGT: op = "ugt"; break;
888 case FCmpInst::FCMP_UGE: op = "uge"; break;
889 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
890 case FCmpInst::FCMP_ONE: op = "one"; break;
891 case FCmpInst::FCMP_OLT: op = "olt"; break;
892 case FCmpInst::FCMP_OLE: op = "ole"; break;
893 case FCmpInst::FCMP_OGT: op = "ogt"; break;
894 case FCmpInst::FCMP_OGE: op = "oge"; break;
896 Out << "llvm_fcmp_" << op << "(";
897 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
899 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
902 if (NeedsClosingParens)
909 errs() << "CWriter Error: Unhandled constant expression: "
914 } else if (isa<UndefValue>(CPV) && CPV->getType()->isSingleValueType()) {
916 printType(Out, CPV->getType()); // sign doesn't matter
918 if (!CPV->getType()->isVectorTy()) {
926 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
927 Type* Ty = CI->getType();
928 if (Ty == Type::getInt1Ty(CPV->getContext()))
929 Out << (CI->getZExtValue() ? '1' : '0');
930 else if (Ty == Type::getInt32Ty(CPV->getContext()))
931 Out << CI->getZExtValue() << 'u';
932 else if (Ty->getPrimitiveSizeInBits() > 32)
933 Out << CI->getZExtValue() << "ull";
936 printSimpleType(Out, Ty, false) << ')';
937 if (CI->isMinValue(true))
938 Out << CI->getZExtValue() << 'u';
940 Out << CI->getSExtValue();
946 switch (CPV->getType()->getTypeID()) {
947 case Type::FloatTyID:
948 case Type::DoubleTyID:
949 case Type::X86_FP80TyID:
950 case Type::PPC_FP128TyID:
951 case Type::FP128TyID: {
952 ConstantFP *FPC = cast<ConstantFP>(CPV);
953 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
954 if (I != FPConstantMap.end()) {
955 // Because of FP precision problems we must load from a stack allocated
956 // value that holds the value in hex.
957 Out << "(*(" << (FPC->getType() == Type::getFloatTy(CPV->getContext()) ?
959 FPC->getType() == Type::getDoubleTy(CPV->getContext()) ?
962 << "*)&FPConstant" << I->second << ')';
965 if (FPC->getType() == Type::getFloatTy(CPV->getContext()))
966 V = FPC->getValueAPF().convertToFloat();
967 else if (FPC->getType() == Type::getDoubleTy(CPV->getContext()))
968 V = FPC->getValueAPF().convertToDouble();
970 // Long double. Convert the number to double, discarding precision.
971 // This is not awesome, but it at least makes the CBE output somewhat
973 APFloat Tmp = FPC->getValueAPF();
975 Tmp.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &LosesInfo);
976 V = Tmp.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::getFloatTy(FPC->getContext()))
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" <<
1007 (FPC->getType() == Type::getFloatTy(FPC->getContext()) ? "F" : "")
1011 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
1012 // Print out the constant as a floating point number.
1014 sprintf(Buffer, "%a", V);
1017 Num = ftostr(FPC->getValueAPF());
1025 case Type::ArrayTyID:
1026 // Use C99 compound expression literal initializer syntax.
1029 printType(Out, CPV->getType());
1032 Out << "{ "; // Arrays are wrapped in struct types.
1033 if (ConstantArray *CA = dyn_cast<ConstantArray>(CPV)) {
1034 printConstantArray(CA, Static);
1036 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1037 ArrayType *AT = cast<ArrayType>(CPV->getType());
1039 if (AT->getNumElements()) {
1041 Constant *CZ = Constant::getNullValue(AT->getElementType());
1042 printConstant(CZ, Static);
1043 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
1045 printConstant(CZ, Static);
1050 Out << " }"; // Arrays are wrapped in struct types.
1053 case Type::VectorTyID:
1054 // Use C99 compound expression literal initializer syntax.
1057 printType(Out, CPV->getType());
1060 if (ConstantVector *CV = dyn_cast<ConstantVector>(CPV)) {
1061 printConstantVector(CV, Static);
1063 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1064 VectorType *VT = cast<VectorType>(CPV->getType());
1066 Constant *CZ = Constant::getNullValue(VT->getElementType());
1067 printConstant(CZ, Static);
1068 for (unsigned i = 1, e = VT->getNumElements(); i != e; ++i) {
1070 printConstant(CZ, Static);
1076 case Type::StructTyID:
1077 // Use C99 compound expression literal initializer syntax.
1080 printType(Out, CPV->getType());
1083 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
1084 StructType *ST = cast<StructType>(CPV->getType());
1086 if (ST->getNumElements()) {
1088 printConstant(Constant::getNullValue(ST->getElementType(0)), Static);
1089 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
1091 printConstant(Constant::getNullValue(ST->getElementType(i)), Static);
1097 if (CPV->getNumOperands()) {
1099 printConstant(cast<Constant>(CPV->getOperand(0)), Static);
1100 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
1102 printConstant(cast<Constant>(CPV->getOperand(i)), Static);
1109 case Type::PointerTyID:
1110 if (isa<ConstantPointerNull>(CPV)) {
1112 printType(Out, CPV->getType()); // sign doesn't matter
1113 Out << ")/*NULL*/0)";
1115 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
1116 writeOperand(GV, Static);
1122 errs() << "Unknown constant type: " << *CPV << "\n";
1124 llvm_unreachable(0);
1128 // Some constant expressions need to be casted back to the original types
1129 // because their operands were casted to the expected type. This function takes
1130 // care of detecting that case and printing the cast for the ConstantExpr.
1131 bool CWriter::printConstExprCast(const ConstantExpr* CE, bool Static) {
1132 bool NeedsExplicitCast = false;
1133 Type *Ty = CE->getOperand(0)->getType();
1134 bool TypeIsSigned = false;
1135 switch (CE->getOpcode()) {
1136 case Instruction::Add:
1137 case Instruction::Sub:
1138 case Instruction::Mul:
1139 // We need to cast integer arithmetic so that it is always performed
1140 // as unsigned, to avoid undefined behavior on overflow.
1141 case Instruction::LShr:
1142 case Instruction::URem:
1143 case Instruction::UDiv: NeedsExplicitCast = true; break;
1144 case Instruction::AShr:
1145 case Instruction::SRem:
1146 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1147 case Instruction::SExt:
1149 NeedsExplicitCast = true;
1150 TypeIsSigned = true;
1152 case Instruction::ZExt:
1153 case Instruction::Trunc:
1154 case Instruction::FPTrunc:
1155 case Instruction::FPExt:
1156 case Instruction::UIToFP:
1157 case Instruction::SIToFP:
1158 case Instruction::FPToUI:
1159 case Instruction::FPToSI:
1160 case Instruction::PtrToInt:
1161 case Instruction::IntToPtr:
1162 case Instruction::BitCast:
1164 NeedsExplicitCast = true;
1168 if (NeedsExplicitCast) {
1170 if (Ty->isIntegerTy() && Ty != Type::getInt1Ty(Ty->getContext()))
1171 printSimpleType(Out, Ty, TypeIsSigned);
1173 printType(Out, Ty); // not integer, sign doesn't matter
1176 return NeedsExplicitCast;
1179 // Print a constant assuming that it is the operand for a given Opcode. The
1180 // opcodes that care about sign need to cast their operands to the expected
1181 // type before the operation proceeds. This function does the casting.
1182 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1184 // Extract the operand's type, we'll need it.
1185 Type* OpTy = CPV->getType();
1187 // Indicate whether to do the cast or not.
1188 bool shouldCast = false;
1189 bool typeIsSigned = false;
1191 // Based on the Opcode for which this Constant is being written, determine
1192 // the new type to which the operand should be casted by setting the value
1193 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1197 // for most instructions, it doesn't matter
1199 case Instruction::Add:
1200 case Instruction::Sub:
1201 case Instruction::Mul:
1202 // We need to cast integer arithmetic so that it is always performed
1203 // as unsigned, to avoid undefined behavior on overflow.
1204 case Instruction::LShr:
1205 case Instruction::UDiv:
1206 case Instruction::URem:
1209 case Instruction::AShr:
1210 case Instruction::SDiv:
1211 case Instruction::SRem:
1213 typeIsSigned = true;
1217 // Write out the casted constant if we should, otherwise just write the
1221 printSimpleType(Out, OpTy, typeIsSigned);
1223 printConstant(CPV, false);
1226 printConstant(CPV, false);
1229 std::string CWriter::GetValueName(const Value *Operand) {
1231 // Resolve potential alias.
1232 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(Operand)) {
1233 if (const Value *V = GA->resolveAliasedGlobal(false))
1237 // Mangle globals with the standard mangler interface for LLC compatibility.
1238 if (const GlobalValue *GV = dyn_cast<GlobalValue>(Operand)) {
1239 SmallString<128> Str;
1240 Mang->getNameWithPrefix(Str, GV, false);
1241 return CBEMangle(Str.str().str());
1244 std::string Name = Operand->getName();
1246 if (Name.empty()) { // Assign unique names to local temporaries.
1247 unsigned &No = AnonValueNumbers[Operand];
1249 No = ++NextAnonValueNumber;
1250 Name = "tmp__" + utostr(No);
1253 std::string VarName;
1254 VarName.reserve(Name.capacity());
1256 for (std::string::iterator I = Name.begin(), E = Name.end();
1260 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1261 (ch >= '0' && ch <= '9') || ch == '_')) {
1263 sprintf(buffer, "_%x_", ch);
1269 return "llvm_cbe_" + VarName;
1272 /// writeInstComputationInline - Emit the computation for the specified
1273 /// instruction inline, with no destination provided.
1274 void CWriter::writeInstComputationInline(Instruction &I) {
1275 // We can't currently support integer types other than 1, 8, 16, 32, 64.
1277 Type *Ty = I.getType();
1278 if (Ty->isIntegerTy() && (Ty!=Type::getInt1Ty(I.getContext()) &&
1279 Ty!=Type::getInt8Ty(I.getContext()) &&
1280 Ty!=Type::getInt16Ty(I.getContext()) &&
1281 Ty!=Type::getInt32Ty(I.getContext()) &&
1282 Ty!=Type::getInt64Ty(I.getContext()))) {
1283 report_fatal_error("The C backend does not currently support integer "
1284 "types of widths other than 1, 8, 16, 32, 64.\n"
1285 "This is being tracked as PR 4158.");
1288 // If this is a non-trivial bool computation, make sure to truncate down to
1289 // a 1 bit value. This is important because we want "add i1 x, y" to return
1290 // "0" when x and y are true, not "2" for example.
1291 bool NeedBoolTrunc = false;
1292 if (I.getType() == Type::getInt1Ty(I.getContext()) &&
1293 !isa<ICmpInst>(I) && !isa<FCmpInst>(I))
1294 NeedBoolTrunc = true;
1306 void CWriter::writeOperandInternal(Value *Operand, bool Static) {
1307 if (Instruction *I = dyn_cast<Instruction>(Operand))
1308 // Should we inline this instruction to build a tree?
1309 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1311 writeInstComputationInline(*I);
1316 Constant* CPV = dyn_cast<Constant>(Operand);
1318 if (CPV && !isa<GlobalValue>(CPV))
1319 printConstant(CPV, Static);
1321 Out << GetValueName(Operand);
1324 void CWriter::writeOperand(Value *Operand, bool Static) {
1325 bool isAddressImplicit = isAddressExposed(Operand);
1326 if (isAddressImplicit)
1327 Out << "(&"; // Global variables are referenced as their addresses by llvm
1329 writeOperandInternal(Operand, Static);
1331 if (isAddressImplicit)
1335 // Some instructions need to have their result value casted back to the
1336 // original types because their operands were casted to the expected type.
1337 // This function takes care of detecting that case and printing the cast
1338 // for the Instruction.
1339 bool CWriter::writeInstructionCast(const Instruction &I) {
1340 Type *Ty = I.getOperand(0)->getType();
1341 switch (I.getOpcode()) {
1342 case Instruction::Add:
1343 case Instruction::Sub:
1344 case Instruction::Mul:
1345 // We need to cast integer arithmetic so that it is always performed
1346 // as unsigned, to avoid undefined behavior on overflow.
1347 case Instruction::LShr:
1348 case Instruction::URem:
1349 case Instruction::UDiv:
1351 printSimpleType(Out, Ty, false);
1354 case Instruction::AShr:
1355 case Instruction::SRem:
1356 case Instruction::SDiv:
1358 printSimpleType(Out, Ty, true);
1366 // Write the operand with a cast to another type based on the Opcode being used.
1367 // This will be used in cases where an instruction has specific type
1368 // requirements (usually signedness) for its operands.
1369 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1371 // Extract the operand's type, we'll need it.
1372 Type* OpTy = Operand->getType();
1374 // Indicate whether to do the cast or not.
1375 bool shouldCast = false;
1377 // Indicate whether the cast should be to a signed type or not.
1378 bool castIsSigned = false;
1380 // Based on the Opcode for which this Operand is being written, determine
1381 // the new type to which the operand should be casted by setting the value
1382 // of OpTy. If we change OpTy, also set shouldCast to true.
1385 // for most instructions, it doesn't matter
1387 case Instruction::Add:
1388 case Instruction::Sub:
1389 case Instruction::Mul:
1390 // We need to cast integer arithmetic so that it is always performed
1391 // as unsigned, to avoid undefined behavior on overflow.
1392 case Instruction::LShr:
1393 case Instruction::UDiv:
1394 case Instruction::URem: // Cast to unsigned first
1396 castIsSigned = false;
1398 case Instruction::GetElementPtr:
1399 case Instruction::AShr:
1400 case Instruction::SDiv:
1401 case Instruction::SRem: // Cast to signed first
1403 castIsSigned = true;
1407 // Write out the casted operand if we should, otherwise just write the
1411 printSimpleType(Out, OpTy, castIsSigned);
1413 writeOperand(Operand);
1416 writeOperand(Operand);
1419 // Write the operand with a cast to another type based on the icmp predicate
1421 void CWriter::writeOperandWithCast(Value* Operand, const ICmpInst &Cmp) {
1422 // This has to do a cast to ensure the operand has the right signedness.
1423 // Also, if the operand is a pointer, we make sure to cast to an integer when
1424 // doing the comparison both for signedness and so that the C compiler doesn't
1425 // optimize things like "p < NULL" to false (p may contain an integer value
1427 bool shouldCast = Cmp.isRelational();
1429 // Write out the casted operand if we should, otherwise just write the
1432 writeOperand(Operand);
1436 // Should this be a signed comparison? If so, convert to signed.
1437 bool castIsSigned = Cmp.isSigned();
1439 // If the operand was a pointer, convert to a large integer type.
1440 Type* OpTy = Operand->getType();
1441 if (OpTy->isPointerTy())
1442 OpTy = TD->getIntPtrType(Operand->getContext());
1445 printSimpleType(Out, OpTy, castIsSigned);
1447 writeOperand(Operand);
1451 // generateCompilerSpecificCode - This is where we add conditional compilation
1452 // directives to cater to specific compilers as need be.
1454 static void generateCompilerSpecificCode(formatted_raw_ostream& Out,
1455 const TargetData *TD) {
1456 // Alloca is hard to get, and we don't want to include stdlib.h here.
1457 Out << "/* get a declaration for alloca */\n"
1458 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1459 << "#define alloca(x) __builtin_alloca((x))\n"
1460 << "#define _alloca(x) __builtin_alloca((x))\n"
1461 << "#elif defined(__APPLE__)\n"
1462 << "extern void *__builtin_alloca(unsigned long);\n"
1463 << "#define alloca(x) __builtin_alloca(x)\n"
1464 << "#define longjmp _longjmp\n"
1465 << "#define setjmp _setjmp\n"
1466 << "#elif defined(__sun__)\n"
1467 << "#if defined(__sparcv9)\n"
1468 << "extern void *__builtin_alloca(unsigned long);\n"
1470 << "extern void *__builtin_alloca(unsigned int);\n"
1472 << "#define alloca(x) __builtin_alloca(x)\n"
1473 << "#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__arm__)\n"
1474 << "#define alloca(x) __builtin_alloca(x)\n"
1475 << "#elif defined(_MSC_VER)\n"
1476 << "#define inline _inline\n"
1477 << "#define alloca(x) _alloca(x)\n"
1479 << "#include <alloca.h>\n"
1482 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1483 // If we aren't being compiled with GCC, just drop these attributes.
1484 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1485 << "#define __attribute__(X)\n"
1488 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1489 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1490 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1491 << "#elif defined(__GNUC__)\n"
1492 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1494 << "#define __EXTERNAL_WEAK__\n"
1497 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1498 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1499 << "#define __ATTRIBUTE_WEAK__\n"
1500 << "#elif defined(__GNUC__)\n"
1501 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1503 << "#define __ATTRIBUTE_WEAK__\n"
1506 // Add hidden visibility support. FIXME: APPLE_CC?
1507 Out << "#if defined(__GNUC__)\n"
1508 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1511 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1512 // From the GCC documentation:
1514 // double __builtin_nan (const char *str)
1516 // This is an implementation of the ISO C99 function nan.
1518 // Since ISO C99 defines this function in terms of strtod, which we do
1519 // not implement, a description of the parsing is in order. The string is
1520 // parsed as by strtol; that is, the base is recognized by leading 0 or
1521 // 0x prefixes. The number parsed is placed in the significand such that
1522 // the least significant bit of the number is at the least significant
1523 // bit of the significand. The number is truncated to fit the significand
1524 // field provided. The significand is forced to be a quiet NaN.
1526 // This function, if given a string literal, is evaluated early enough
1527 // that it is considered a compile-time constant.
1529 // float __builtin_nanf (const char *str)
1531 // Similar to __builtin_nan, except the return type is float.
1533 // double __builtin_inf (void)
1535 // Similar to __builtin_huge_val, except a warning is generated if the
1536 // target floating-point format does not support infinities. This
1537 // function is suitable for implementing the ISO C99 macro INFINITY.
1539 // float __builtin_inff (void)
1541 // Similar to __builtin_inf, except the return type is float.
1542 Out << "#ifdef __GNUC__\n"
1543 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1544 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1545 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1546 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1547 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1548 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1549 << "#define LLVM_PREFETCH(addr,rw,locality) "
1550 "__builtin_prefetch(addr,rw,locality)\n"
1551 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1552 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1553 << "#define LLVM_ASM __asm__\n"
1555 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1556 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1557 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1558 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1559 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1560 << "#define LLVM_INFF 0.0F /* Float */\n"
1561 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1562 << "#define __ATTRIBUTE_CTOR__\n"
1563 << "#define __ATTRIBUTE_DTOR__\n"
1564 << "#define LLVM_ASM(X)\n"
1567 Out << "#if __GNUC__ < 4 /* Old GCC's, or compilers not GCC */ \n"
1568 << "#define __builtin_stack_save() 0 /* not implemented */\n"
1569 << "#define __builtin_stack_restore(X) /* noop */\n"
1572 // Output typedefs for 128-bit integers. If these are needed with a
1573 // 32-bit target or with a C compiler that doesn't support mode(TI),
1574 // more drastic measures will be needed.
1575 Out << "#if __GNUC__ && __LP64__ /* 128-bit integer types */\n"
1576 << "typedef int __attribute__((mode(TI))) llvmInt128;\n"
1577 << "typedef unsigned __attribute__((mode(TI))) llvmUInt128;\n"
1580 // Output target-specific code that should be inserted into main.
1581 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1584 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1585 /// the StaticTors set.
1586 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1587 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1588 if (!InitList) return;
1590 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1591 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1592 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1594 if (CS->getOperand(1)->isNullValue())
1595 return; // Found a null terminator, exit printing.
1596 Constant *FP = CS->getOperand(1);
1597 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1599 FP = CE->getOperand(0);
1600 if (Function *F = dyn_cast<Function>(FP))
1601 StaticTors.insert(F);
1605 enum SpecialGlobalClass {
1607 GlobalCtors, GlobalDtors,
1611 /// getGlobalVariableClass - If this is a global that is specially recognized
1612 /// by LLVM, return a code that indicates how we should handle it.
1613 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1614 // If this is a global ctors/dtors list, handle it now.
1615 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1616 if (GV->getName() == "llvm.global_ctors")
1618 else if (GV->getName() == "llvm.global_dtors")
1622 // Otherwise, if it is other metadata, don't print it. This catches things
1623 // like debug information.
1624 if (GV->getSection() == "llvm.metadata")
1630 // PrintEscapedString - Print each character of the specified string, escaping
1631 // it if it is not printable or if it is an escape char.
1632 static void PrintEscapedString(const char *Str, unsigned Length,
1634 for (unsigned i = 0; i != Length; ++i) {
1635 unsigned char C = Str[i];
1636 if (isprint(C) && C != '\\' && C != '"')
1645 Out << "\\x" << hexdigit(C >> 4) << hexdigit(C & 0x0F);
1649 // PrintEscapedString - Print each character of the specified string, escaping
1650 // it if it is not printable or if it is an escape char.
1651 static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
1652 PrintEscapedString(Str.c_str(), Str.size(), Out);
1655 bool CWriter::doInitialization(Module &M) {
1656 FunctionPass::doInitialization(M);
1661 TD = new TargetData(&M);
1662 IL = new IntrinsicLowering(*TD);
1663 IL->AddPrototypes(M);
1666 std::string Triple = TheModule->getTargetTriple();
1668 Triple = llvm::sys::getHostTriple();
1671 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
1672 TAsm = Match->createMCAsmInfo(Triple);
1674 TAsm = new CBEMCAsmInfo();
1675 MRI = new MCRegisterInfo();
1676 TCtx = new MCContext(*TAsm, *MRI, NULL);
1677 Mang = new Mangler(*TCtx, *TD);
1679 // Keep track of which functions are static ctors/dtors so they can have
1680 // an attribute added to their prototypes.
1681 std::set<Function*> StaticCtors, StaticDtors;
1682 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1684 switch (getGlobalVariableClass(I)) {
1687 FindStaticTors(I, StaticCtors);
1690 FindStaticTors(I, StaticDtors);
1695 // get declaration for alloca
1696 Out << "/* Provide Declarations */\n";
1697 Out << "#include <stdarg.h>\n"; // Varargs support
1698 Out << "#include <setjmp.h>\n"; // Unwind support
1699 Out << "#include <limits.h>\n"; // With overflow intrinsics support.
1700 generateCompilerSpecificCode(Out, TD);
1702 // Provide a definition for `bool' if not compiling with a C++ compiler.
1704 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1706 << "\n\n/* Support for floating point constants */\n"
1707 << "typedef unsigned long long ConstantDoubleTy;\n"
1708 << "typedef unsigned int ConstantFloatTy;\n"
1709 << "typedef struct { unsigned long long f1; unsigned short f2; "
1710 "unsigned short pad[3]; } ConstantFP80Ty;\n"
1711 // This is used for both kinds of 128-bit long double; meaning differs.
1712 << "typedef struct { unsigned long long f1; unsigned long long f2; }"
1713 " ConstantFP128Ty;\n"
1714 << "\n\n/* Global Declarations */\n";
1716 // First output all the declarations for the program, because C requires
1717 // Functions & globals to be declared before they are used.
1719 if (!M.getModuleInlineAsm().empty()) {
1720 Out << "/* Module asm statements */\n"
1723 // Split the string into lines, to make it easier to read the .ll file.
1724 std::string Asm = M.getModuleInlineAsm();
1726 size_t NewLine = Asm.find_first_of('\n', CurPos);
1727 while (NewLine != std::string::npos) {
1728 // We found a newline, print the portion of the asm string from the
1729 // last newline up to this newline.
1731 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.begin()+NewLine),
1735 NewLine = Asm.find_first_of('\n', CurPos);
1738 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.end()), Out);
1740 << "/* End Module asm statements */\n";
1743 // Loop over the symbol table, emitting all named constants.
1746 // Global variable declarations...
1747 if (!M.global_empty()) {
1748 Out << "\n/* External Global Variable Declarations */\n";
1749 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1752 if (I->hasExternalLinkage() || I->hasExternalWeakLinkage() ||
1753 I->hasCommonLinkage())
1755 else if (I->hasDLLImportLinkage())
1756 Out << "__declspec(dllimport) ";
1758 continue; // Internal Global
1760 // Thread Local Storage
1761 if (I->isThreadLocal())
1764 printType(Out, I->getType()->getElementType(), false, GetValueName(I));
1766 if (I->hasExternalWeakLinkage())
1767 Out << " __EXTERNAL_WEAK__";
1772 // Function declarations
1773 Out << "\n/* Function Declarations */\n";
1774 Out << "double fmod(double, double);\n"; // Support for FP rem
1775 Out << "float fmodf(float, float);\n";
1776 Out << "long double fmodl(long double, long double);\n";
1778 // Store the intrinsics which will be declared/defined below.
1779 SmallVector<const Function*, 8> intrinsicsToDefine;
1781 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1782 // Don't print declarations for intrinsic functions.
1783 // Store the used intrinsics, which need to be explicitly defined.
1784 if (I->isIntrinsic()) {
1785 switch (I->getIntrinsicID()) {
1788 case Intrinsic::uadd_with_overflow:
1789 case Intrinsic::sadd_with_overflow:
1790 intrinsicsToDefine.push_back(I);
1796 if (I->getName() == "setjmp" ||
1797 I->getName() == "longjmp" || I->getName() == "_setjmp")
1800 if (I->hasExternalWeakLinkage())
1802 printFunctionSignature(I, true);
1803 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1804 Out << " __ATTRIBUTE_WEAK__";
1805 if (I->hasExternalWeakLinkage())
1806 Out << " __EXTERNAL_WEAK__";
1807 if (StaticCtors.count(I))
1808 Out << " __ATTRIBUTE_CTOR__";
1809 if (StaticDtors.count(I))
1810 Out << " __ATTRIBUTE_DTOR__";
1811 if (I->hasHiddenVisibility())
1812 Out << " __HIDDEN__";
1814 if (I->hasName() && I->getName()[0] == 1)
1815 Out << " LLVM_ASM(\"" << I->getName().substr(1) << "\")";
1820 // Output the global variable declarations
1821 if (!M.global_empty()) {
1822 Out << "\n\n/* Global Variable Declarations */\n";
1823 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1825 if (!I->isDeclaration()) {
1826 // Ignore special globals, such as debug info.
1827 if (getGlobalVariableClass(I))
1830 if (I->hasLocalLinkage())
1835 // Thread Local Storage
1836 if (I->isThreadLocal())
1839 printType(Out, I->getType()->getElementType(), false,
1842 if (I->hasLinkOnceLinkage())
1843 Out << " __attribute__((common))";
1844 else if (I->hasCommonLinkage()) // FIXME is this right?
1845 Out << " __ATTRIBUTE_WEAK__";
1846 else if (I->hasWeakLinkage())
1847 Out << " __ATTRIBUTE_WEAK__";
1848 else if (I->hasExternalWeakLinkage())
1849 Out << " __EXTERNAL_WEAK__";
1850 if (I->hasHiddenVisibility())
1851 Out << " __HIDDEN__";
1856 // Output the global variable definitions and contents...
1857 if (!M.global_empty()) {
1858 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1859 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1861 if (!I->isDeclaration()) {
1862 // Ignore special globals, such as debug info.
1863 if (getGlobalVariableClass(I))
1866 if (I->hasLocalLinkage())
1868 else if (I->hasDLLImportLinkage())
1869 Out << "__declspec(dllimport) ";
1870 else if (I->hasDLLExportLinkage())
1871 Out << "__declspec(dllexport) ";
1873 // Thread Local Storage
1874 if (I->isThreadLocal())
1877 printType(Out, I->getType()->getElementType(), false,
1879 if (I->hasLinkOnceLinkage())
1880 Out << " __attribute__((common))";
1881 else if (I->hasWeakLinkage())
1882 Out << " __ATTRIBUTE_WEAK__";
1883 else if (I->hasCommonLinkage())
1884 Out << " __ATTRIBUTE_WEAK__";
1886 if (I->hasHiddenVisibility())
1887 Out << " __HIDDEN__";
1889 // If the initializer is not null, emit the initializer. If it is null,
1890 // we try to avoid emitting large amounts of zeros. The problem with
1891 // this, however, occurs when the variable has weak linkage. In this
1892 // case, the assembler will complain about the variable being both weak
1893 // and common, so we disable this optimization.
1894 // FIXME common linkage should avoid this problem.
1895 if (!I->getInitializer()->isNullValue()) {
1897 writeOperand(I->getInitializer(), true);
1898 } else if (I->hasWeakLinkage()) {
1899 // We have to specify an initializer, but it doesn't have to be
1900 // complete. If the value is an aggregate, print out { 0 }, and let
1901 // the compiler figure out the rest of the zeros.
1903 if (I->getInitializer()->getType()->isStructTy() ||
1904 I->getInitializer()->getType()->isVectorTy()) {
1906 } else if (I->getInitializer()->getType()->isArrayTy()) {
1907 // As with structs and vectors, but with an extra set of braces
1908 // because arrays are wrapped in structs.
1911 // Just print it out normally.
1912 writeOperand(I->getInitializer(), true);
1920 Out << "\n\n/* Function Bodies */\n";
1922 // Emit some helper functions for dealing with FCMP instruction's
1924 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1925 Out << "return X == X && Y == Y; }\n";
1926 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1927 Out << "return X != X || Y != Y; }\n";
1928 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1929 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1930 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1931 Out << "return X != Y; }\n";
1932 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1933 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1934 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1935 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1936 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1937 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1938 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1939 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1940 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1941 Out << "return X == Y ; }\n";
1942 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1943 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1944 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1945 Out << "return X < Y ; }\n";
1946 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1947 Out << "return X > Y ; }\n";
1948 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1949 Out << "return X <= Y ; }\n";
1950 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1951 Out << "return X >= Y ; }\n";
1953 // Emit definitions of the intrinsics.
1954 for (SmallVector<const Function*, 8>::const_iterator
1955 I = intrinsicsToDefine.begin(),
1956 E = intrinsicsToDefine.end(); I != E; ++I) {
1957 printIntrinsicDefinition(**I, Out);
1964 /// Output all floating point constants that cannot be printed accurately...
1965 void CWriter::printFloatingPointConstants(Function &F) {
1966 // Scan the module for floating point constants. If any FP constant is used
1967 // in the function, we want to redirect it here so that we do not depend on
1968 // the precision of the printed form, unless the printed form preserves
1971 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1973 printFloatingPointConstants(*I);
1978 void CWriter::printFloatingPointConstants(const Constant *C) {
1979 // If this is a constant expression, recursively check for constant fp values.
1980 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
1981 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
1982 printFloatingPointConstants(CE->getOperand(i));
1986 // Otherwise, check for a FP constant that we need to print.
1987 const ConstantFP *FPC = dyn_cast<ConstantFP>(C);
1989 // Do not put in FPConstantMap if safe.
1990 isFPCSafeToPrint(FPC) ||
1991 // Already printed this constant?
1992 FPConstantMap.count(FPC))
1995 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1997 if (FPC->getType() == Type::getDoubleTy(FPC->getContext())) {
1998 double Val = FPC->getValueAPF().convertToDouble();
1999 uint64_t i = FPC->getValueAPF().bitcastToAPInt().getZExtValue();
2000 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
2001 << " = 0x" << utohexstr(i)
2002 << "ULL; /* " << Val << " */\n";
2003 } else if (FPC->getType() == Type::getFloatTy(FPC->getContext())) {
2004 float Val = FPC->getValueAPF().convertToFloat();
2005 uint32_t i = (uint32_t)FPC->getValueAPF().bitcastToAPInt().
2007 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
2008 << " = 0x" << utohexstr(i)
2009 << "U; /* " << Val << " */\n";
2010 } else if (FPC->getType() == Type::getX86_FP80Ty(FPC->getContext())) {
2011 // api needed to prevent premature destruction
2012 APInt api = FPC->getValueAPF().bitcastToAPInt();
2013 const uint64_t *p = api.getRawData();
2014 Out << "static const ConstantFP80Ty FPConstant" << FPCounter++
2015 << " = { 0x" << utohexstr(p[0])
2016 << "ULL, 0x" << utohexstr((uint16_t)p[1]) << ",{0,0,0}"
2017 << "}; /* Long double constant */\n";
2018 } else if (FPC->getType() == Type::getPPC_FP128Ty(FPC->getContext()) ||
2019 FPC->getType() == Type::getFP128Ty(FPC->getContext())) {
2020 APInt api = FPC->getValueAPF().bitcastToAPInt();
2021 const uint64_t *p = api.getRawData();
2022 Out << "static const ConstantFP128Ty FPConstant" << FPCounter++
2024 << utohexstr(p[0]) << ", 0x" << utohexstr(p[1])
2025 << "}; /* Long double constant */\n";
2028 llvm_unreachable("Unknown float type!");
2033 /// printSymbolTable - Run through symbol table looking for type names. If a
2034 /// type name is found, emit its declaration...
2036 void CWriter::printModuleTypes() {
2037 Out << "/* Helper union for bitcasts */\n";
2038 Out << "typedef union {\n";
2039 Out << " unsigned int Int32;\n";
2040 Out << " unsigned long long Int64;\n";
2041 Out << " float Float;\n";
2042 Out << " double Double;\n";
2043 Out << "} llvmBitCastUnion;\n";
2045 // Get all of the struct types used in the module.
2046 std::vector<StructType*> StructTypes;
2047 TheModule->findUsedStructTypes(StructTypes);
2049 if (StructTypes.empty()) return;
2051 Out << "/* Structure forward decls */\n";
2053 unsigned NextTypeID = 0;
2055 // If any of them are missing names, add a unique ID to UnnamedStructIDs.
2056 // Print out forward declarations for structure types.
2057 for (unsigned i = 0, e = StructTypes.size(); i != e; ++i) {
2058 StructType *ST = StructTypes[i];
2060 if (ST->isAnonymous() || ST->getName().empty())
2061 UnnamedStructIDs[ST] = NextTypeID++;
2063 std::string Name = getStructName(ST);
2065 Out << "typedef struct " << Name << ' ' << Name << ";\n";
2070 // Keep track of which structures have been printed so far.
2071 SmallPtrSet<Type *, 16> StructPrinted;
2073 // Loop over all structures then push them into the stack so they are
2074 // printed in the correct order.
2076 Out << "/* Structure contents */\n";
2077 for (unsigned i = 0, e = StructTypes.size(); i != e; ++i)
2078 if (StructTypes[i]->isStructTy())
2079 // Only print out used types!
2080 printContainedStructs(StructTypes[i], StructPrinted);
2083 // Push the struct onto the stack and recursively push all structs
2084 // this one depends on.
2086 // TODO: Make this work properly with vector types
2088 void CWriter::printContainedStructs(Type *Ty,
2089 SmallPtrSet<Type *, 16> &StructPrinted) {
2090 // Don't walk through pointers.
2091 if (Ty->isPointerTy() || Ty->isPrimitiveType() || Ty->isIntegerTy())
2094 // Print all contained types first.
2095 for (Type::subtype_iterator I = Ty->subtype_begin(),
2096 E = Ty->subtype_end(); I != E; ++I)
2097 printContainedStructs(*I, StructPrinted);
2099 if (StructType *ST = dyn_cast<StructType>(Ty)) {
2100 // Check to see if we have already printed this struct.
2101 if (!StructPrinted.insert(Ty)) return;
2103 // Print structure type out.
2104 printType(Out, ST, false, getStructName(ST), true);
2109 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
2110 /// isStructReturn - Should this function actually return a struct by-value?
2111 bool isStructReturn = F->hasStructRetAttr();
2113 if (F->hasLocalLinkage()) Out << "static ";
2114 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
2115 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
2116 switch (F->getCallingConv()) {
2117 case CallingConv::X86_StdCall:
2118 Out << "__attribute__((stdcall)) ";
2120 case CallingConv::X86_FastCall:
2121 Out << "__attribute__((fastcall)) ";
2123 case CallingConv::X86_ThisCall:
2124 Out << "__attribute__((thiscall)) ";
2130 // Loop over the arguments, printing them...
2131 FunctionType *FT = cast<FunctionType>(F->getFunctionType());
2132 const AttrListPtr &PAL = F->getAttributes();
2135 raw_string_ostream FunctionInnards(tstr);
2137 // Print out the name...
2138 FunctionInnards << GetValueName(F) << '(';
2140 bool PrintedArg = false;
2141 if (!F->isDeclaration()) {
2142 if (!F->arg_empty()) {
2143 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
2146 // If this is a struct-return function, don't print the hidden
2147 // struct-return argument.
2148 if (isStructReturn) {
2149 assert(I != E && "Invalid struct return function!");
2154 std::string ArgName;
2155 for (; I != E; ++I) {
2156 if (PrintedArg) FunctionInnards << ", ";
2157 if (I->hasName() || !Prototype)
2158 ArgName = GetValueName(I);
2161 Type *ArgTy = I->getType();
2162 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2163 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2164 ByValParams.insert(I);
2166 printType(FunctionInnards, ArgTy,
2167 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt),
2174 // Loop over the arguments, printing them.
2175 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
2178 // If this is a struct-return function, don't print the hidden
2179 // struct-return argument.
2180 if (isStructReturn) {
2181 assert(I != E && "Invalid struct return function!");
2186 for (; I != E; ++I) {
2187 if (PrintedArg) FunctionInnards << ", ";
2189 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2190 assert(ArgTy->isPointerTy());
2191 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2193 printType(FunctionInnards, ArgTy,
2194 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt));
2200 if (!PrintedArg && FT->isVarArg()) {
2201 FunctionInnards << "int vararg_dummy_arg";
2205 // Finish printing arguments... if this is a vararg function, print the ...,
2206 // unless there are no known types, in which case, we just emit ().
2208 if (FT->isVarArg() && PrintedArg) {
2209 FunctionInnards << ",..."; // Output varargs portion of signature!
2210 } else if (!FT->isVarArg() && !PrintedArg) {
2211 FunctionInnards << "void"; // ret() -> ret(void) in C.
2213 FunctionInnards << ')';
2215 // Get the return tpe for the function.
2217 if (!isStructReturn)
2218 RetTy = F->getReturnType();
2220 // If this is a struct-return function, print the struct-return type.
2221 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
2224 // Print out the return type and the signature built above.
2225 printType(Out, RetTy,
2226 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt),
2227 FunctionInnards.str());
2230 static inline bool isFPIntBitCast(const Instruction &I) {
2231 if (!isa<BitCastInst>(I))
2233 Type *SrcTy = I.getOperand(0)->getType();
2234 Type *DstTy = I.getType();
2235 return (SrcTy->isFloatingPointTy() && DstTy->isIntegerTy()) ||
2236 (DstTy->isFloatingPointTy() && SrcTy->isIntegerTy());
2239 void CWriter::printFunction(Function &F) {
2240 /// isStructReturn - Should this function actually return a struct by-value?
2241 bool isStructReturn = F.hasStructRetAttr();
2243 printFunctionSignature(&F, false);
2246 // If this is a struct return function, handle the result with magic.
2247 if (isStructReturn) {
2249 cast<PointerType>(F.arg_begin()->getType())->getElementType();
2251 printType(Out, StructTy, false, "StructReturn");
2252 Out << "; /* Struct return temporary */\n";
2255 printType(Out, F.arg_begin()->getType(), false,
2256 GetValueName(F.arg_begin()));
2257 Out << " = &StructReturn;\n";
2260 bool PrintedVar = false;
2262 // print local variable information for the function
2263 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
2264 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
2266 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
2267 Out << "; /* Address-exposed local */\n";
2269 } else if (I->getType() != Type::getVoidTy(F.getContext()) &&
2270 !isInlinableInst(*I)) {
2272 printType(Out, I->getType(), false, GetValueName(&*I));
2275 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
2277 printType(Out, I->getType(), false,
2278 GetValueName(&*I)+"__PHI_TEMPORARY");
2283 // We need a temporary for the BitCast to use so it can pluck a value out
2284 // of a union to do the BitCast. This is separate from the need for a
2285 // variable to hold the result of the BitCast.
2286 if (isFPIntBitCast(*I)) {
2287 Out << " llvmBitCastUnion " << GetValueName(&*I)
2288 << "__BITCAST_TEMPORARY;\n";
2296 if (F.hasExternalLinkage() && F.getName() == "main")
2297 Out << " CODE_FOR_MAIN();\n";
2299 // print the basic blocks
2300 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
2301 if (Loop *L = LI->getLoopFor(BB)) {
2302 if (L->getHeader() == BB && L->getParentLoop() == 0)
2305 printBasicBlock(BB);
2312 void CWriter::printLoop(Loop *L) {
2313 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
2314 << "' to make GCC happy */\n";
2315 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
2316 BasicBlock *BB = L->getBlocks()[i];
2317 Loop *BBLoop = LI->getLoopFor(BB);
2319 printBasicBlock(BB);
2320 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
2323 Out << " } while (1); /* end of syntactic loop '"
2324 << L->getHeader()->getName() << "' */\n";
2327 void CWriter::printBasicBlock(BasicBlock *BB) {
2329 // Don't print the label for the basic block if there are no uses, or if
2330 // the only terminator use is the predecessor basic block's terminator.
2331 // We have to scan the use list because PHI nodes use basic blocks too but
2332 // do not require a label to be generated.
2334 bool NeedsLabel = false;
2335 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
2336 if (isGotoCodeNecessary(*PI, BB)) {
2341 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2343 // Output all of the instructions in the basic block...
2344 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2346 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2347 if (II->getType() != Type::getVoidTy(BB->getContext()) &&
2352 writeInstComputationInline(*II);
2357 // Don't emit prefix or suffix for the terminator.
2358 visit(*BB->getTerminator());
2362 // Specific Instruction type classes... note that all of the casts are
2363 // necessary because we use the instruction classes as opaque types...
2365 void CWriter::visitReturnInst(ReturnInst &I) {
2366 // If this is a struct return function, return the temporary struct.
2367 bool isStructReturn = I.getParent()->getParent()->hasStructRetAttr();
2369 if (isStructReturn) {
2370 Out << " return StructReturn;\n";
2374 // Don't output a void return if this is the last basic block in the function
2375 if (I.getNumOperands() == 0 &&
2376 &*--I.getParent()->getParent()->end() == I.getParent() &&
2377 !I.getParent()->size() == 1) {
2382 if (I.getNumOperands()) {
2384 writeOperand(I.getOperand(0));
2389 void CWriter::visitSwitchInst(SwitchInst &SI) {
2392 writeOperand(SI.getOperand(0));
2393 Out << ") {\n default:\n";
2394 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2395 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2397 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2399 writeOperand(SI.getOperand(i));
2401 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2402 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2403 printBranchToBlock(SI.getParent(), Succ, 2);
2404 if (Function::iterator(Succ) == llvm::next(Function::iterator(SI.getParent())))
2410 void CWriter::visitIndirectBrInst(IndirectBrInst &IBI) {
2411 Out << " goto *(void*)(";
2412 writeOperand(IBI.getOperand(0));
2416 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2417 Out << " /*UNREACHABLE*/;\n";
2420 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2421 /// FIXME: This should be reenabled, but loop reordering safe!!
2424 if (llvm::next(Function::iterator(From)) != Function::iterator(To))
2425 return true; // Not the direct successor, we need a goto.
2427 //isa<SwitchInst>(From->getTerminator())
2429 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2434 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2435 BasicBlock *Successor,
2437 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2438 PHINode *PN = cast<PHINode>(I);
2439 // Now we have to do the printing.
2440 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2441 if (!isa<UndefValue>(IV)) {
2442 Out << std::string(Indent, ' ');
2443 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2445 Out << "; /* for PHI node */\n";
2450 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2452 if (isGotoCodeNecessary(CurBB, Succ)) {
2453 Out << std::string(Indent, ' ') << " goto ";
2459 // Branch instruction printing - Avoid printing out a branch to a basic block
2460 // that immediately succeeds the current one.
2462 void CWriter::visitBranchInst(BranchInst &I) {
2464 if (I.isConditional()) {
2465 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2467 writeOperand(I.getCondition());
2470 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2471 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2473 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2474 Out << " } else {\n";
2475 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2476 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2479 // First goto not necessary, assume second one is...
2481 writeOperand(I.getCondition());
2484 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2485 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2490 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2491 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2496 // PHI nodes get copied into temporary values at the end of predecessor basic
2497 // blocks. We now need to copy these temporary values into the REAL value for
2499 void CWriter::visitPHINode(PHINode &I) {
2501 Out << "__PHI_TEMPORARY";
2505 void CWriter::visitBinaryOperator(Instruction &I) {
2506 // binary instructions, shift instructions, setCond instructions.
2507 assert(!I.getType()->isPointerTy());
2509 // We must cast the results of binary operations which might be promoted.
2510 bool needsCast = false;
2511 if ((I.getType() == Type::getInt8Ty(I.getContext())) ||
2512 (I.getType() == Type::getInt16Ty(I.getContext()))
2513 || (I.getType() == Type::getFloatTy(I.getContext()))) {
2516 printType(Out, I.getType(), false);
2520 // If this is a negation operation, print it out as such. For FP, we don't
2521 // want to print "-0.0 - X".
2522 if (BinaryOperator::isNeg(&I)) {
2524 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2526 } else if (BinaryOperator::isFNeg(&I)) {
2528 writeOperand(BinaryOperator::getFNegArgument(cast<BinaryOperator>(&I)));
2530 } else if (I.getOpcode() == Instruction::FRem) {
2531 // Output a call to fmod/fmodf instead of emitting a%b
2532 if (I.getType() == Type::getFloatTy(I.getContext()))
2534 else if (I.getType() == Type::getDoubleTy(I.getContext()))
2536 else // all 3 flavors of long double
2538 writeOperand(I.getOperand(0));
2540 writeOperand(I.getOperand(1));
2544 // Write out the cast of the instruction's value back to the proper type
2546 bool NeedsClosingParens = writeInstructionCast(I);
2548 // Certain instructions require the operand to be forced to a specific type
2549 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2550 // below for operand 1
2551 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2553 switch (I.getOpcode()) {
2554 case Instruction::Add:
2555 case Instruction::FAdd: Out << " + "; break;
2556 case Instruction::Sub:
2557 case Instruction::FSub: Out << " - "; break;
2558 case Instruction::Mul:
2559 case Instruction::FMul: Out << " * "; break;
2560 case Instruction::URem:
2561 case Instruction::SRem:
2562 case Instruction::FRem: Out << " % "; break;
2563 case Instruction::UDiv:
2564 case Instruction::SDiv:
2565 case Instruction::FDiv: Out << " / "; break;
2566 case Instruction::And: Out << " & "; break;
2567 case Instruction::Or: Out << " | "; break;
2568 case Instruction::Xor: Out << " ^ "; break;
2569 case Instruction::Shl : Out << " << "; break;
2570 case Instruction::LShr:
2571 case Instruction::AShr: Out << " >> "; break;
2574 errs() << "Invalid operator type!" << I;
2576 llvm_unreachable(0);
2579 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2580 if (NeedsClosingParens)
2589 void CWriter::visitICmpInst(ICmpInst &I) {
2590 // We must cast the results of icmp which might be promoted.
2591 bool needsCast = false;
2593 // Write out the cast of the instruction's value back to the proper type
2595 bool NeedsClosingParens = writeInstructionCast(I);
2597 // Certain icmp predicate require the operand to be forced to a specific type
2598 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2599 // below for operand 1
2600 writeOperandWithCast(I.getOperand(0), I);
2602 switch (I.getPredicate()) {
2603 case ICmpInst::ICMP_EQ: Out << " == "; break;
2604 case ICmpInst::ICMP_NE: Out << " != "; break;
2605 case ICmpInst::ICMP_ULE:
2606 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2607 case ICmpInst::ICMP_UGE:
2608 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2609 case ICmpInst::ICMP_ULT:
2610 case ICmpInst::ICMP_SLT: Out << " < "; break;
2611 case ICmpInst::ICMP_UGT:
2612 case ICmpInst::ICMP_SGT: Out << " > "; break;
2615 errs() << "Invalid icmp predicate!" << I;
2617 llvm_unreachable(0);
2620 writeOperandWithCast(I.getOperand(1), I);
2621 if (NeedsClosingParens)
2629 void CWriter::visitFCmpInst(FCmpInst &I) {
2630 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2634 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2640 switch (I.getPredicate()) {
2641 default: llvm_unreachable("Illegal FCmp predicate");
2642 case FCmpInst::FCMP_ORD: op = "ord"; break;
2643 case FCmpInst::FCMP_UNO: op = "uno"; break;
2644 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2645 case FCmpInst::FCMP_UNE: op = "une"; break;
2646 case FCmpInst::FCMP_ULT: op = "ult"; break;
2647 case FCmpInst::FCMP_ULE: op = "ule"; break;
2648 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2649 case FCmpInst::FCMP_UGE: op = "uge"; break;
2650 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2651 case FCmpInst::FCMP_ONE: op = "one"; break;
2652 case FCmpInst::FCMP_OLT: op = "olt"; break;
2653 case FCmpInst::FCMP_OLE: op = "ole"; break;
2654 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2655 case FCmpInst::FCMP_OGE: op = "oge"; break;
2658 Out << "llvm_fcmp_" << op << "(";
2659 // Write the first operand
2660 writeOperand(I.getOperand(0));
2662 // Write the second operand
2663 writeOperand(I.getOperand(1));
2667 static const char * getFloatBitCastField(Type *Ty) {
2668 switch (Ty->getTypeID()) {
2669 default: llvm_unreachable("Invalid Type");
2670 case Type::FloatTyID: return "Float";
2671 case Type::DoubleTyID: return "Double";
2672 case Type::IntegerTyID: {
2673 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2682 void CWriter::visitCastInst(CastInst &I) {
2683 Type *DstTy = I.getType();
2684 Type *SrcTy = I.getOperand(0)->getType();
2685 if (isFPIntBitCast(I)) {
2687 // These int<->float and long<->double casts need to be handled specially
2688 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2689 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2690 writeOperand(I.getOperand(0));
2691 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2692 << getFloatBitCastField(I.getType());
2698 printCast(I.getOpcode(), SrcTy, DstTy);
2700 // Make a sext from i1 work by subtracting the i1 from 0 (an int).
2701 if (SrcTy == Type::getInt1Ty(I.getContext()) &&
2702 I.getOpcode() == Instruction::SExt)
2705 writeOperand(I.getOperand(0));
2707 if (DstTy == Type::getInt1Ty(I.getContext()) &&
2708 (I.getOpcode() == Instruction::Trunc ||
2709 I.getOpcode() == Instruction::FPToUI ||
2710 I.getOpcode() == Instruction::FPToSI ||
2711 I.getOpcode() == Instruction::PtrToInt)) {
2712 // Make sure we really get a trunc to bool by anding the operand with 1
2718 void CWriter::visitSelectInst(SelectInst &I) {
2720 writeOperand(I.getCondition());
2722 writeOperand(I.getTrueValue());
2724 writeOperand(I.getFalseValue());
2728 // Returns the macro name or value of the max or min of an integer type
2729 // (as defined in limits.h).
2730 static void printLimitValue(IntegerType &Ty, bool isSigned, bool isMax,
2733 const char* sprefix = "";
2735 unsigned NumBits = Ty.getBitWidth();
2739 } else if (NumBits <= 16) {
2741 } else if (NumBits <= 32) {
2743 } else if (NumBits <= 64) {
2746 llvm_unreachable("Bit widths > 64 not implemented yet");
2750 Out << sprefix << type << (isMax ? "_MAX" : "_MIN");
2752 Out << "U" << type << (isMax ? "_MAX" : "0");
2756 static bool isSupportedIntegerSize(IntegerType &T) {
2757 return T.getBitWidth() == 8 || T.getBitWidth() == 16 ||
2758 T.getBitWidth() == 32 || T.getBitWidth() == 64;
2762 void CWriter::printIntrinsicDefinition(const Function &F, raw_ostream &Out) {
2763 FunctionType *funT = F.getFunctionType();
2764 Type *retT = F.getReturnType();
2765 IntegerType *elemT = cast<IntegerType>(funT->getParamType(1));
2767 assert(isSupportedIntegerSize(*elemT) &&
2768 "CBackend does not support arbitrary size integers.");
2769 assert(cast<StructType>(retT)->getElementType(0) == elemT &&
2770 elemT == funT->getParamType(0) && funT->getNumParams() == 2);
2772 switch (F.getIntrinsicID()) {
2774 llvm_unreachable("Unsupported Intrinsic.");
2775 case Intrinsic::uadd_with_overflow:
2776 // static inline Rty uadd_ixx(unsigned ixx a, unsigned ixx b) {
2778 // r.field0 = a + b;
2779 // r.field1 = (r.field0 < a);
2782 Out << "static inline ";
2783 printType(Out, retT);
2784 Out << GetValueName(&F);
2786 printSimpleType(Out, elemT, false);
2788 printSimpleType(Out, elemT, false);
2790 printType(Out, retT);
2792 Out << " r.field0 = a + b;\n";
2793 Out << " r.field1 = (r.field0 < a);\n";
2794 Out << " return r;\n}\n";
2797 case Intrinsic::sadd_with_overflow:
2798 // static inline Rty sadd_ixx(ixx a, ixx b) {
2800 // r.field1 = (b > 0 && a > XX_MAX - b) ||
2801 // (b < 0 && a < XX_MIN - b);
2802 // r.field0 = r.field1 ? 0 : a + b;
2806 printType(Out, retT);
2807 Out << GetValueName(&F);
2809 printSimpleType(Out, elemT, true);
2811 printSimpleType(Out, elemT, true);
2813 printType(Out, retT);
2815 Out << " r.field1 = (b > 0 && a > ";
2816 printLimitValue(*elemT, true, true, Out);
2817 Out << " - b) || (b < 0 && a < ";
2818 printLimitValue(*elemT, true, false, Out);
2820 Out << " r.field0 = r.field1 ? 0 : a + b;\n";
2821 Out << " return r;\n}\n";
2826 void CWriter::lowerIntrinsics(Function &F) {
2827 // This is used to keep track of intrinsics that get generated to a lowered
2828 // function. We must generate the prototypes before the function body which
2829 // will only be expanded on first use (by the loop below).
2830 std::vector<Function*> prototypesToGen;
2832 // Examine all the instructions in this function to find the intrinsics that
2833 // need to be lowered.
2834 for (Function::iterator BB = F.begin(), EE = F.end(); BB != EE; ++BB)
2835 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2836 if (CallInst *CI = dyn_cast<CallInst>(I++))
2837 if (Function *F = CI->getCalledFunction())
2838 switch (F->getIntrinsicID()) {
2839 case Intrinsic::not_intrinsic:
2840 case Intrinsic::memory_barrier:
2841 case Intrinsic::vastart:
2842 case Intrinsic::vacopy:
2843 case Intrinsic::vaend:
2844 case Intrinsic::returnaddress:
2845 case Intrinsic::frameaddress:
2846 case Intrinsic::setjmp:
2847 case Intrinsic::longjmp:
2848 case Intrinsic::prefetch:
2849 case Intrinsic::powi:
2850 case Intrinsic::x86_sse_cmp_ss:
2851 case Intrinsic::x86_sse_cmp_ps:
2852 case Intrinsic::x86_sse2_cmp_sd:
2853 case Intrinsic::x86_sse2_cmp_pd:
2854 case Intrinsic::ppc_altivec_lvsl:
2855 case Intrinsic::uadd_with_overflow:
2856 case Intrinsic::sadd_with_overflow:
2857 // We directly implement these intrinsics
2860 // If this is an intrinsic that directly corresponds to a GCC
2861 // builtin, we handle it.
2862 const char *BuiltinName = "";
2863 #define GET_GCC_BUILTIN_NAME
2864 #include "llvm/Intrinsics.gen"
2865 #undef GET_GCC_BUILTIN_NAME
2866 // If we handle it, don't lower it.
2867 if (BuiltinName[0]) break;
2869 // All other intrinsic calls we must lower.
2870 Instruction *Before = 0;
2871 if (CI != &BB->front())
2872 Before = prior(BasicBlock::iterator(CI));
2874 IL->LowerIntrinsicCall(CI);
2875 if (Before) { // Move iterator to instruction after call
2880 // If the intrinsic got lowered to another call, and that call has
2881 // a definition then we need to make sure its prototype is emitted
2882 // before any calls to it.
2883 if (CallInst *Call = dyn_cast<CallInst>(I))
2884 if (Function *NewF = Call->getCalledFunction())
2885 if (!NewF->isDeclaration())
2886 prototypesToGen.push_back(NewF);
2891 // We may have collected some prototypes to emit in the loop above.
2892 // Emit them now, before the function that uses them is emitted. But,
2893 // be careful not to emit them twice.
2894 std::vector<Function*>::iterator I = prototypesToGen.begin();
2895 std::vector<Function*>::iterator E = prototypesToGen.end();
2896 for ( ; I != E; ++I) {
2897 if (intrinsicPrototypesAlreadyGenerated.insert(*I).second) {
2899 printFunctionSignature(*I, true);
2905 void CWriter::visitCallInst(CallInst &I) {
2906 if (isa<InlineAsm>(I.getCalledValue()))
2907 return visitInlineAsm(I);
2909 bool WroteCallee = false;
2911 // Handle intrinsic function calls first...
2912 if (Function *F = I.getCalledFunction())
2913 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
2914 if (visitBuiltinCall(I, ID, WroteCallee))
2917 Value *Callee = I.getCalledValue();
2919 PointerType *PTy = cast<PointerType>(Callee->getType());
2920 FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2922 // If this is a call to a struct-return function, assign to the first
2923 // parameter instead of passing it to the call.
2924 const AttrListPtr &PAL = I.getAttributes();
2925 bool hasByVal = I.hasByValArgument();
2926 bool isStructRet = I.hasStructRetAttr();
2928 writeOperandDeref(I.getArgOperand(0));
2932 if (I.isTailCall()) Out << " /*tail*/ ";
2935 // If this is an indirect call to a struct return function, we need to cast
2936 // the pointer. Ditto for indirect calls with byval arguments.
2937 bool NeedsCast = (hasByVal || isStructRet) && !isa<Function>(Callee);
2939 // GCC is a real PITA. It does not permit codegening casts of functions to
2940 // function pointers if they are in a call (it generates a trap instruction
2941 // instead!). We work around this by inserting a cast to void* in between
2942 // the function and the function pointer cast. Unfortunately, we can't just
2943 // form the constant expression here, because the folder will immediately
2946 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2947 // that void* and function pointers have the same size. :( To deal with this
2948 // in the common case, we handle casts where the number of arguments passed
2951 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2953 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2959 // Ok, just cast the pointer type.
2962 printStructReturnPointerFunctionType(Out, PAL,
2963 cast<PointerType>(I.getCalledValue()->getType()));
2965 printType(Out, I.getCalledValue()->getType(), false, "", true, PAL);
2967 printType(Out, I.getCalledValue()->getType());
2970 writeOperand(Callee);
2971 if (NeedsCast) Out << ')';
2976 bool PrintedArg = false;
2977 if(FTy->isVarArg() && !FTy->getNumParams()) {
2978 Out << "0 /*dummy arg*/";
2982 unsigned NumDeclaredParams = FTy->getNumParams();
2984 CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
2986 if (isStructRet) { // Skip struct return argument.
2992 for (; AI != AE; ++AI, ++ArgNo) {
2993 if (PrintedArg) Out << ", ";
2994 if (ArgNo < NumDeclaredParams &&
2995 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2997 printType(Out, FTy->getParamType(ArgNo),
2998 /*isSigned=*/PAL.paramHasAttr(ArgNo+1, Attribute::SExt));
3001 // Check if the argument is expected to be passed by value.
3002 if (I.paramHasAttr(ArgNo+1, Attribute::ByVal))
3003 writeOperandDeref(*AI);
3011 /// visitBuiltinCall - Handle the call to the specified builtin. Returns true
3012 /// if the entire call is handled, return false if it wasn't handled, and
3013 /// optionally set 'WroteCallee' if the callee has already been printed out.
3014 bool CWriter::visitBuiltinCall(CallInst &I, Intrinsic::ID ID,
3015 bool &WroteCallee) {
3018 // If this is an intrinsic that directly corresponds to a GCC
3019 // builtin, we emit it here.
3020 const char *BuiltinName = "";
3021 Function *F = I.getCalledFunction();
3022 #define GET_GCC_BUILTIN_NAME
3023 #include "llvm/Intrinsics.gen"
3024 #undef GET_GCC_BUILTIN_NAME
3025 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
3031 case Intrinsic::memory_barrier:
3032 Out << "__sync_synchronize()";
3034 case Intrinsic::vastart:
3037 Out << "va_start(*(va_list*)";
3038 writeOperand(I.getArgOperand(0));
3040 // Output the last argument to the enclosing function.
3041 if (I.getParent()->getParent()->arg_empty())
3042 Out << "vararg_dummy_arg";
3044 writeOperand(--I.getParent()->getParent()->arg_end());
3047 case Intrinsic::vaend:
3048 if (!isa<ConstantPointerNull>(I.getArgOperand(0))) {
3049 Out << "0; va_end(*(va_list*)";
3050 writeOperand(I.getArgOperand(0));
3053 Out << "va_end(*(va_list*)0)";
3056 case Intrinsic::vacopy:
3058 Out << "va_copy(*(va_list*)";
3059 writeOperand(I.getArgOperand(0));
3060 Out << ", *(va_list*)";
3061 writeOperand(I.getArgOperand(1));
3064 case Intrinsic::returnaddress:
3065 Out << "__builtin_return_address(";
3066 writeOperand(I.getArgOperand(0));
3069 case Intrinsic::frameaddress:
3070 Out << "__builtin_frame_address(";
3071 writeOperand(I.getArgOperand(0));
3074 case Intrinsic::powi:
3075 Out << "__builtin_powi(";
3076 writeOperand(I.getArgOperand(0));
3078 writeOperand(I.getArgOperand(1));
3081 case Intrinsic::setjmp:
3082 Out << "setjmp(*(jmp_buf*)";
3083 writeOperand(I.getArgOperand(0));
3086 case Intrinsic::longjmp:
3087 Out << "longjmp(*(jmp_buf*)";
3088 writeOperand(I.getArgOperand(0));
3090 writeOperand(I.getArgOperand(1));
3093 case Intrinsic::prefetch:
3094 Out << "LLVM_PREFETCH((const void *)";
3095 writeOperand(I.getArgOperand(0));
3097 writeOperand(I.getArgOperand(1));
3099 writeOperand(I.getArgOperand(2));
3102 case Intrinsic::stacksave:
3103 // Emit this as: Val = 0; *((void**)&Val) = __builtin_stack_save()
3104 // to work around GCC bugs (see PR1809).
3105 Out << "0; *((void**)&" << GetValueName(&I)
3106 << ") = __builtin_stack_save()";
3108 case Intrinsic::x86_sse_cmp_ss:
3109 case Intrinsic::x86_sse_cmp_ps:
3110 case Intrinsic::x86_sse2_cmp_sd:
3111 case Intrinsic::x86_sse2_cmp_pd:
3113 printType(Out, I.getType());
3115 // Multiple GCC builtins multiplex onto this intrinsic.
3116 switch (cast<ConstantInt>(I.getArgOperand(2))->getZExtValue()) {
3117 default: llvm_unreachable("Invalid llvm.x86.sse.cmp!");
3118 case 0: Out << "__builtin_ia32_cmpeq"; break;
3119 case 1: Out << "__builtin_ia32_cmplt"; break;
3120 case 2: Out << "__builtin_ia32_cmple"; break;
3121 case 3: Out << "__builtin_ia32_cmpunord"; break;
3122 case 4: Out << "__builtin_ia32_cmpneq"; break;
3123 case 5: Out << "__builtin_ia32_cmpnlt"; break;
3124 case 6: Out << "__builtin_ia32_cmpnle"; break;
3125 case 7: Out << "__builtin_ia32_cmpord"; break;
3127 if (ID == Intrinsic::x86_sse_cmp_ps || ID == Intrinsic::x86_sse2_cmp_pd)
3131 if (ID == Intrinsic::x86_sse_cmp_ss || ID == Intrinsic::x86_sse_cmp_ps)
3137 writeOperand(I.getArgOperand(0));
3139 writeOperand(I.getArgOperand(1));
3142 case Intrinsic::ppc_altivec_lvsl:
3144 printType(Out, I.getType());
3146 Out << "__builtin_altivec_lvsl(0, (void*)";
3147 writeOperand(I.getArgOperand(0));
3150 case Intrinsic::uadd_with_overflow:
3151 case Intrinsic::sadd_with_overflow:
3152 Out << GetValueName(I.getCalledFunction()) << "(";
3153 writeOperand(I.getArgOperand(0));
3155 writeOperand(I.getArgOperand(1));
3161 //This converts the llvm constraint string to something gcc is expecting.
3162 //TODO: work out platform independent constraints and factor those out
3163 // of the per target tables
3164 // handle multiple constraint codes
3165 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
3166 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
3168 // Grab the translation table from MCAsmInfo if it exists.
3169 const MCAsmInfo *TargetAsm;
3170 std::string Triple = TheModule->getTargetTriple();
3172 Triple = llvm::sys::getHostTriple();
3175 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
3176 TargetAsm = Match->createMCAsmInfo(Triple);
3180 const char *const *table = TargetAsm->getAsmCBE();
3182 // Search the translation table if it exists.
3183 for (int i = 0; table && table[i]; i += 2)
3184 if (c.Codes[0] == table[i]) {
3189 // Default is identity.
3194 //TODO: import logic from AsmPrinter.cpp
3195 static std::string gccifyAsm(std::string asmstr) {
3196 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
3197 if (asmstr[i] == '\n')
3198 asmstr.replace(i, 1, "\\n");
3199 else if (asmstr[i] == '\t')
3200 asmstr.replace(i, 1, "\\t");
3201 else if (asmstr[i] == '$') {
3202 if (asmstr[i + 1] == '{') {
3203 std::string::size_type a = asmstr.find_first_of(':', i + 1);
3204 std::string::size_type b = asmstr.find_first_of('}', i + 1);
3205 std::string n = "%" +
3206 asmstr.substr(a + 1, b - a - 1) +
3207 asmstr.substr(i + 2, a - i - 2);
3208 asmstr.replace(i, b - i + 1, n);
3211 asmstr.replace(i, 1, "%");
3213 else if (asmstr[i] == '%')//grr
3214 { asmstr.replace(i, 1, "%%"); ++i;}
3219 //TODO: assumptions about what consume arguments from the call are likely wrong
3220 // handle communitivity
3221 void CWriter::visitInlineAsm(CallInst &CI) {
3222 InlineAsm* as = cast<InlineAsm>(CI.getCalledValue());
3223 InlineAsm::ConstraintInfoVector Constraints = as->ParseConstraints();
3225 std::vector<std::pair<Value*, int> > ResultVals;
3226 if (CI.getType() == Type::getVoidTy(CI.getContext()))
3228 else if (StructType *ST = dyn_cast<StructType>(CI.getType())) {
3229 for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i)
3230 ResultVals.push_back(std::make_pair(&CI, (int)i));
3232 ResultVals.push_back(std::make_pair(&CI, -1));
3235 // Fix up the asm string for gcc and emit it.
3236 Out << "__asm__ volatile (\"" << gccifyAsm(as->getAsmString()) << "\"\n";
3239 unsigned ValueCount = 0;
3240 bool IsFirst = true;
3242 // Convert over all the output constraints.
3243 for (InlineAsm::ConstraintInfoVector::iterator I = Constraints.begin(),
3244 E = Constraints.end(); I != E; ++I) {
3246 if (I->Type != InlineAsm::isOutput) {
3248 continue; // Ignore non-output constraints.
3251 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3252 std::string C = InterpretASMConstraint(*I);
3253 if (C.empty()) continue;
3264 if (ValueCount < ResultVals.size()) {
3265 DestVal = ResultVals[ValueCount].first;
3266 DestValNo = ResultVals[ValueCount].second;
3268 DestVal = CI.getArgOperand(ValueCount-ResultVals.size());
3270 if (I->isEarlyClobber)
3273 Out << "\"=" << C << "\"(" << GetValueName(DestVal);
3274 if (DestValNo != -1)
3275 Out << ".field" << DestValNo; // Multiple retvals.
3281 // Convert over all the input constraints.
3285 for (InlineAsm::ConstraintInfoVector::iterator I = Constraints.begin(),
3286 E = Constraints.end(); I != E; ++I) {
3287 if (I->Type != InlineAsm::isInput) {
3289 continue; // Ignore non-input constraints.
3292 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3293 std::string C = InterpretASMConstraint(*I);
3294 if (C.empty()) continue;
3301 assert(ValueCount >= ResultVals.size() && "Input can't refer to result");
3302 Value *SrcVal = CI.getArgOperand(ValueCount-ResultVals.size());
3304 Out << "\"" << C << "\"(";
3306 writeOperand(SrcVal);
3308 writeOperandDeref(SrcVal);
3312 // Convert over the clobber constraints.
3314 for (InlineAsm::ConstraintInfoVector::iterator I = Constraints.begin(),
3315 E = Constraints.end(); I != E; ++I) {
3316 if (I->Type != InlineAsm::isClobber)
3317 continue; // Ignore non-input constraints.
3319 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3320 std::string C = InterpretASMConstraint(*I);
3321 if (C.empty()) continue;
3328 Out << '\"' << C << '"';
3334 void CWriter::visitAllocaInst(AllocaInst &I) {
3336 printType(Out, I.getType());
3337 Out << ") alloca(sizeof(";
3338 printType(Out, I.getType()->getElementType());
3340 if (I.isArrayAllocation()) {
3342 writeOperand(I.getOperand(0));
3347 void CWriter::printGEPExpression(Value *Ptr, gep_type_iterator I,
3348 gep_type_iterator E, bool Static) {
3350 // If there are no indices, just print out the pointer.
3356 // Find out if the last index is into a vector. If so, we have to print this
3357 // specially. Since vectors can't have elements of indexable type, only the
3358 // last index could possibly be of a vector element.
3359 VectorType *LastIndexIsVector = 0;
3361 for (gep_type_iterator TmpI = I; TmpI != E; ++TmpI)
3362 LastIndexIsVector = dyn_cast<VectorType>(*TmpI);
3367 // If the last index is into a vector, we can't print it as &a[i][j] because
3368 // we can't index into a vector with j in GCC. Instead, emit this as
3369 // (((float*)&a[i])+j)
3370 if (LastIndexIsVector) {
3372 printType(Out, PointerType::getUnqual(LastIndexIsVector->getElementType()));
3378 // If the first index is 0 (very typical) we can do a number of
3379 // simplifications to clean up the code.
3380 Value *FirstOp = I.getOperand();
3381 if (!isa<Constant>(FirstOp) || !cast<Constant>(FirstOp)->isNullValue()) {
3382 // First index isn't simple, print it the hard way.
3385 ++I; // Skip the zero index.
3387 // Okay, emit the first operand. If Ptr is something that is already address
3388 // exposed, like a global, avoid emitting (&foo)[0], just emit foo instead.
3389 if (isAddressExposed(Ptr)) {
3390 writeOperandInternal(Ptr, Static);
3391 } else if (I != E && (*I)->isStructTy()) {
3392 // If we didn't already emit the first operand, see if we can print it as
3393 // P->f instead of "P[0].f"
3395 Out << "->field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3396 ++I; // eat the struct index as well.
3398 // Instead of emitting P[0][1], emit (*P)[1], which is more idiomatic.
3405 for (; I != E; ++I) {
3406 if ((*I)->isStructTy()) {
3407 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3408 } else if ((*I)->isArrayTy()) {
3410 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3412 } else if (!(*I)->isVectorTy()) {
3414 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3417 // If the last index is into a vector, then print it out as "+j)". This
3418 // works with the 'LastIndexIsVector' code above.
3419 if (isa<Constant>(I.getOperand()) &&
3420 cast<Constant>(I.getOperand())->isNullValue()) {
3421 Out << "))"; // avoid "+0".
3424 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3432 void CWriter::writeMemoryAccess(Value *Operand, Type *OperandType,
3433 bool IsVolatile, unsigned Alignment) {
3435 bool IsUnaligned = Alignment &&
3436 Alignment < TD->getABITypeAlignment(OperandType);
3440 if (IsVolatile || IsUnaligned) {
3443 Out << "struct __attribute__ ((packed, aligned(" << Alignment << "))) {";
3444 printType(Out, OperandType, false, IsUnaligned ? "data" : "volatile*");
3447 if (IsVolatile) Out << "volatile ";
3453 writeOperand(Operand);
3455 if (IsVolatile || IsUnaligned) {
3462 void CWriter::visitLoadInst(LoadInst &I) {
3463 writeMemoryAccess(I.getOperand(0), I.getType(), I.isVolatile(),
3468 void CWriter::visitStoreInst(StoreInst &I) {
3469 writeMemoryAccess(I.getPointerOperand(), I.getOperand(0)->getType(),
3470 I.isVolatile(), I.getAlignment());
3472 Value *Operand = I.getOperand(0);
3473 Constant *BitMask = 0;
3474 if (IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
3475 if (!ITy->isPowerOf2ByteWidth())
3476 // We have a bit width that doesn't match an even power-of-2 byte
3477 // size. Consequently we must & the value with the type's bit mask
3478 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
3481 writeOperand(Operand);
3484 printConstant(BitMask, false);
3489 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
3490 printGEPExpression(I.getPointerOperand(), gep_type_begin(I),
3491 gep_type_end(I), false);
3494 void CWriter::visitVAArgInst(VAArgInst &I) {
3495 Out << "va_arg(*(va_list*)";
3496 writeOperand(I.getOperand(0));
3498 printType(Out, I.getType());
3502 void CWriter::visitInsertElementInst(InsertElementInst &I) {
3503 Type *EltTy = I.getType()->getElementType();
3504 writeOperand(I.getOperand(0));
3507 printType(Out, PointerType::getUnqual(EltTy));
3508 Out << ")(&" << GetValueName(&I) << "))[";
3509 writeOperand(I.getOperand(2));
3511 writeOperand(I.getOperand(1));
3515 void CWriter::visitExtractElementInst(ExtractElementInst &I) {
3516 // We know that our operand is not inlined.
3519 cast<VectorType>(I.getOperand(0)->getType())->getElementType();
3520 printType(Out, PointerType::getUnqual(EltTy));
3521 Out << ")(&" << GetValueName(I.getOperand(0)) << "))[";
3522 writeOperand(I.getOperand(1));
3526 void CWriter::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
3528 printType(Out, SVI.getType());
3530 VectorType *VT = SVI.getType();
3531 unsigned NumElts = VT->getNumElements();
3532 Type *EltTy = VT->getElementType();
3534 for (unsigned i = 0; i != NumElts; ++i) {
3536 int SrcVal = SVI.getMaskValue(i);
3537 if ((unsigned)SrcVal >= NumElts*2) {
3538 Out << " 0/*undef*/ ";
3540 Value *Op = SVI.getOperand((unsigned)SrcVal >= NumElts);
3541 if (isa<Instruction>(Op)) {
3542 // Do an extractelement of this value from the appropriate input.
3544 printType(Out, PointerType::getUnqual(EltTy));
3545 Out << ")(&" << GetValueName(Op)
3546 << "))[" << (SrcVal & (NumElts-1)) << "]";
3547 } else if (isa<ConstantAggregateZero>(Op) || isa<UndefValue>(Op)) {
3550 printConstant(cast<ConstantVector>(Op)->getOperand(SrcVal &
3559 void CWriter::visitInsertValueInst(InsertValueInst &IVI) {
3560 // Start by copying the entire aggregate value into the result variable.
3561 writeOperand(IVI.getOperand(0));
3564 // Then do the insert to update the field.
3565 Out << GetValueName(&IVI);
3566 for (const unsigned *b = IVI.idx_begin(), *i = b, *e = IVI.idx_end();
3569 ExtractValueInst::getIndexedType(IVI.getOperand(0)->getType(),
3570 makeArrayRef(b, i+1));
3571 if (IndexedTy->isArrayTy())
3572 Out << ".array[" << *i << "]";
3574 Out << ".field" << *i;
3577 writeOperand(IVI.getOperand(1));
3580 void CWriter::visitExtractValueInst(ExtractValueInst &EVI) {
3582 if (isa<UndefValue>(EVI.getOperand(0))) {
3584 printType(Out, EVI.getType());
3585 Out << ") 0/*UNDEF*/";
3587 Out << GetValueName(EVI.getOperand(0));
3588 for (const unsigned *b = EVI.idx_begin(), *i = b, *e = EVI.idx_end();
3591 ExtractValueInst::getIndexedType(EVI.getOperand(0)->getType(),
3592 makeArrayRef(b, i+1));
3593 if (IndexedTy->isArrayTy())
3594 Out << ".array[" << *i << "]";
3596 Out << ".field" << *i;
3602 //===----------------------------------------------------------------------===//
3603 // External Interface declaration
3604 //===----------------------------------------------------------------------===//
3606 bool CTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
3607 formatted_raw_ostream &o,
3608 CodeGenFileType FileType,
3609 CodeGenOpt::Level OptLevel,
3610 bool DisableVerify) {
3611 if (FileType != TargetMachine::CGFT_AssemblyFile) return true;
3613 PM.add(createGCLoweringPass());
3614 PM.add(createLowerInvokePass());
3615 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
3616 PM.add(new CWriter(o));
3617 PM.add(createGCInfoDeleter());