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/MCObjectFileInfo.h"
41 #include "llvm/MC/MCRegisterInfo.h"
42 #include "llvm/MC/MCSubtargetInfo.h"
43 #include "llvm/MC/MCSymbol.h"
44 #include "llvm/Target/TargetData.h"
45 #include "llvm/Target/TargetRegistry.h"
46 #include "llvm/Support/CallSite.h"
47 #include "llvm/Support/CFG.h"
48 #include "llvm/Support/ErrorHandling.h"
49 #include "llvm/Support/FormattedStream.h"
50 #include "llvm/Support/GetElementPtrTypeIterator.h"
51 #include "llvm/Support/InstVisitor.h"
52 #include "llvm/Support/MathExtras.h"
53 #include "llvm/Support/Host.h"
54 #include "llvm/Config/config.h"
56 // Some ms header decided to define setjmp as _setjmp, undo this for this file.
62 extern "C" void LLVMInitializeCBackendTarget() {
63 // Register the target.
64 RegisterTargetMachine<CTargetMachine> X(TheCBackendTarget);
68 class CBEMCAsmInfo : public MCAsmInfo {
72 PrivateGlobalPrefix = "";
76 /// CWriter - This class is the main chunk of code that converts an LLVM
77 /// module to a C translation unit.
78 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
79 formatted_raw_ostream &Out;
80 IntrinsicLowering *IL;
83 const Module *TheModule;
84 const MCAsmInfo* TAsm;
85 const MCRegisterInfo *MRI;
86 const MCObjectFileInfo *MOFI;
90 std::map<const ConstantFP *, unsigned> FPConstantMap;
91 std::set<Function*> intrinsicPrototypesAlreadyGenerated;
92 std::set<const Argument*> ByValParams;
94 unsigned OpaqueCounter;
95 DenseMap<const Value*, unsigned> AnonValueNumbers;
96 unsigned NextAnonValueNumber;
98 /// UnnamedStructIDs - This contains a unique ID for each struct that is
99 /// either anonymous or has no name.
100 DenseMap<StructType*, unsigned> UnnamedStructIDs;
104 explicit CWriter(formatted_raw_ostream &o)
105 : FunctionPass(ID), Out(o), IL(0), Mang(0), LI(0),
106 TheModule(0), TAsm(0), MRI(0), MOFI(0), TCtx(0), TD(0),
107 OpaqueCounter(0), NextAnonValueNumber(0) {
108 initializeLoopInfoPass(*PassRegistry::getPassRegistry());
112 virtual const char *getPassName() const { return "C backend"; }
114 void getAnalysisUsage(AnalysisUsage &AU) const {
115 AU.addRequired<LoopInfo>();
116 AU.setPreservesAll();
119 virtual bool doInitialization(Module &M);
121 bool runOnFunction(Function &F) {
122 // Do not codegen any 'available_externally' functions at all, they have
123 // definitions outside the translation unit.
124 if (F.hasAvailableExternallyLinkage())
127 LI = &getAnalysis<LoopInfo>();
129 // Get rid of intrinsics we can't handle.
132 // Output all floating point constants that cannot be printed accurately.
133 printFloatingPointConstants(F);
139 virtual bool doFinalization(Module &M) {
148 FPConstantMap.clear();
150 intrinsicPrototypesAlreadyGenerated.clear();
151 UnnamedStructIDs.clear();
155 raw_ostream &printType(raw_ostream &Out, Type *Ty,
156 bool isSigned = false,
157 const std::string &VariableName = "",
158 bool IgnoreName = false,
159 const AttrListPtr &PAL = AttrListPtr());
160 raw_ostream &printSimpleType(raw_ostream &Out, Type *Ty,
162 const std::string &NameSoFar = "");
164 void printStructReturnPointerFunctionType(raw_ostream &Out,
165 const AttrListPtr &PAL,
168 std::string getStructName(StructType *ST);
170 /// writeOperandDeref - Print the result of dereferencing the specified
171 /// operand with '*'. This is equivalent to printing '*' then using
172 /// writeOperand, but avoids excess syntax in some cases.
173 void writeOperandDeref(Value *Operand) {
174 if (isAddressExposed(Operand)) {
175 // Already something with an address exposed.
176 writeOperandInternal(Operand);
179 writeOperand(Operand);
184 void writeOperand(Value *Operand, bool Static = false);
185 void writeInstComputationInline(Instruction &I);
186 void writeOperandInternal(Value *Operand, bool Static = false);
187 void writeOperandWithCast(Value* Operand, unsigned Opcode);
188 void writeOperandWithCast(Value* Operand, const ICmpInst &I);
189 bool writeInstructionCast(const Instruction &I);
191 void writeMemoryAccess(Value *Operand, Type *OperandType,
192 bool IsVolatile, unsigned Alignment);
195 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
197 void lowerIntrinsics(Function &F);
198 /// Prints the definition of the intrinsic function F. Supports the
199 /// intrinsics which need to be explicitly defined in the CBackend.
200 void printIntrinsicDefinition(const Function &F, raw_ostream &Out);
202 void printModuleTypes();
203 void printContainedStructs(Type *Ty, SmallPtrSet<Type *, 16> &);
204 void printFloatingPointConstants(Function &F);
205 void printFloatingPointConstants(const Constant *C);
206 void printFunctionSignature(const Function *F, bool Prototype);
208 void printFunction(Function &);
209 void printBasicBlock(BasicBlock *BB);
210 void printLoop(Loop *L);
212 void printCast(unsigned opcode, Type *SrcTy, Type *DstTy);
213 void printConstant(Constant *CPV, bool Static);
214 void printConstantWithCast(Constant *CPV, unsigned Opcode);
215 bool printConstExprCast(const ConstantExpr *CE, bool Static);
216 void printConstantArray(ConstantArray *CPA, bool Static);
217 void printConstantVector(ConstantVector *CV, bool Static);
219 /// isAddressExposed - Return true if the specified value's name needs to
220 /// have its address taken in order to get a C value of the correct type.
221 /// This happens for global variables, byval parameters, and direct allocas.
222 bool isAddressExposed(const Value *V) const {
223 if (const Argument *A = dyn_cast<Argument>(V))
224 return ByValParams.count(A);
225 return isa<GlobalVariable>(V) || isDirectAlloca(V);
228 // isInlinableInst - Attempt to inline instructions into their uses to build
229 // trees as much as possible. To do this, we have to consistently decide
230 // what is acceptable to inline, so that variable declarations don't get
231 // printed and an extra copy of the expr is not emitted.
233 static bool isInlinableInst(const Instruction &I) {
234 // Always inline cmp instructions, even if they are shared by multiple
235 // expressions. GCC generates horrible code if we don't.
239 // Must be an expression, must be used exactly once. If it is dead, we
240 // emit it inline where it would go.
241 if (I.getType() == Type::getVoidTy(I.getContext()) || !I.hasOneUse() ||
242 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
243 isa<LoadInst>(I) || isa<VAArgInst>(I) || isa<InsertElementInst>(I) ||
244 isa<InsertValueInst>(I))
245 // Don't inline a load across a store or other bad things!
248 // Must not be used in inline asm, extractelement, or shufflevector.
250 const Instruction &User = cast<Instruction>(*I.use_back());
251 if (isInlineAsm(User) || isa<ExtractElementInst>(User) ||
252 isa<ShuffleVectorInst>(User))
256 // Only inline instruction it if it's use is in the same BB as the inst.
257 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
260 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
261 // variables which are accessed with the & operator. This causes GCC to
262 // generate significantly better code than to emit alloca calls directly.
264 static const AllocaInst *isDirectAlloca(const Value *V) {
265 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
267 if (AI->isArrayAllocation())
268 return 0; // FIXME: we can also inline fixed size array allocas!
269 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
274 // isInlineAsm - Check if the instruction is a call to an inline asm chunk.
275 static bool isInlineAsm(const Instruction& I) {
276 if (const CallInst *CI = dyn_cast<CallInst>(&I))
277 return isa<InlineAsm>(CI->getCalledValue());
281 // Instruction visitation functions
282 friend class InstVisitor<CWriter>;
284 void visitReturnInst(ReturnInst &I);
285 void visitBranchInst(BranchInst &I);
286 void visitSwitchInst(SwitchInst &I);
287 void visitIndirectBrInst(IndirectBrInst &I);
288 void visitInvokeInst(InvokeInst &I) {
289 llvm_unreachable("Lowerinvoke pass didn't work!");
292 void visitUnwindInst(UnwindInst &I) {
293 llvm_unreachable("Lowerinvoke pass didn't work!");
295 void visitUnreachableInst(UnreachableInst &I);
297 void visitPHINode(PHINode &I);
298 void visitBinaryOperator(Instruction &I);
299 void visitICmpInst(ICmpInst &I);
300 void visitFCmpInst(FCmpInst &I);
302 void visitCastInst (CastInst &I);
303 void visitSelectInst(SelectInst &I);
304 void visitCallInst (CallInst &I);
305 void visitInlineAsm(CallInst &I);
306 bool visitBuiltinCall(CallInst &I, Intrinsic::ID ID, bool &WroteCallee);
308 void visitAllocaInst(AllocaInst &I);
309 void visitLoadInst (LoadInst &I);
310 void visitStoreInst (StoreInst &I);
311 void visitGetElementPtrInst(GetElementPtrInst &I);
312 void visitVAArgInst (VAArgInst &I);
314 void visitInsertElementInst(InsertElementInst &I);
315 void visitExtractElementInst(ExtractElementInst &I);
316 void visitShuffleVectorInst(ShuffleVectorInst &SVI);
318 void visitInsertValueInst(InsertValueInst &I);
319 void visitExtractValueInst(ExtractValueInst &I);
321 void visitInstruction(Instruction &I) {
323 errs() << "C Writer does not know about " << I;
328 void outputLValue(Instruction *I) {
329 Out << " " << GetValueName(I) << " = ";
332 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
333 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
334 BasicBlock *Successor, unsigned Indent);
335 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
337 void printGEPExpression(Value *Ptr, gep_type_iterator I,
338 gep_type_iterator E, bool Static);
340 std::string GetValueName(const Value *Operand);
344 char CWriter::ID = 0;
348 static std::string CBEMangle(const std::string &S) {
351 for (unsigned i = 0, e = S.size(); i != e; ++i)
352 if (isalnum(S[i]) || S[i] == '_') {
356 Result += 'A'+(S[i]&15);
357 Result += 'A'+((S[i]>>4)&15);
363 std::string CWriter::getStructName(StructType *ST) {
364 if (!ST->isAnonymous() && !ST->getName().empty())
365 return CBEMangle("l_"+ST->getName().str());
367 return "l_unnamed_" + utostr(UnnamedStructIDs[ST]);
371 /// printStructReturnPointerFunctionType - This is like printType for a struct
372 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
373 /// print it as "Struct (*)(...)", for struct return functions.
374 void CWriter::printStructReturnPointerFunctionType(raw_ostream &Out,
375 const AttrListPtr &PAL,
376 PointerType *TheTy) {
377 FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
379 raw_string_ostream FunctionInnards(tstr);
380 FunctionInnards << " (*) (";
381 bool PrintedType = false;
383 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
384 Type *RetTy = cast<PointerType>(*I)->getElementType();
386 for (++I, ++Idx; I != E; ++I, ++Idx) {
388 FunctionInnards << ", ";
390 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
391 assert(ArgTy->isPointerTy());
392 ArgTy = cast<PointerType>(ArgTy)->getElementType();
394 printType(FunctionInnards, ArgTy,
395 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
398 if (FTy->isVarArg()) {
400 FunctionInnards << " int"; //dummy argument for empty vararg functs
401 FunctionInnards << ", ...";
402 } else if (!PrintedType) {
403 FunctionInnards << "void";
405 FunctionInnards << ')';
406 printType(Out, RetTy,
407 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
411 CWriter::printSimpleType(raw_ostream &Out, Type *Ty, bool isSigned,
412 const std::string &NameSoFar) {
413 assert((Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) &&
414 "Invalid type for printSimpleType");
415 switch (Ty->getTypeID()) {
416 case Type::VoidTyID: return Out << "void " << NameSoFar;
417 case Type::IntegerTyID: {
418 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
420 return Out << "bool " << NameSoFar;
421 else if (NumBits <= 8)
422 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
423 else if (NumBits <= 16)
424 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
425 else if (NumBits <= 32)
426 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
427 else if (NumBits <= 64)
428 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
430 assert(NumBits <= 128 && "Bit widths > 128 not implemented yet");
431 return Out << (isSigned?"llvmInt128":"llvmUInt128") << " " << NameSoFar;
434 case Type::FloatTyID: return Out << "float " << NameSoFar;
435 case Type::DoubleTyID: return Out << "double " << NameSoFar;
436 // Lacking emulation of FP80 on PPC, etc., we assume whichever of these is
437 // present matches host 'long double'.
438 case Type::X86_FP80TyID:
439 case Type::PPC_FP128TyID:
440 case Type::FP128TyID: return Out << "long double " << NameSoFar;
442 case Type::X86_MMXTyID:
443 return printSimpleType(Out, Type::getInt32Ty(Ty->getContext()), isSigned,
444 " __attribute__((vector_size(64))) " + NameSoFar);
446 case Type::VectorTyID: {
447 VectorType *VTy = cast<VectorType>(Ty);
448 return printSimpleType(Out, VTy->getElementType(), isSigned,
449 " __attribute__((vector_size(" +
450 utostr(TD->getTypeAllocSize(VTy)) + " ))) " + NameSoFar);
455 errs() << "Unknown primitive type: " << *Ty << "\n";
461 // Pass the Type* and the variable name and this prints out the variable
464 raw_ostream &CWriter::printType(raw_ostream &Out, Type *Ty,
465 bool isSigned, const std::string &NameSoFar,
466 bool IgnoreName, const AttrListPtr &PAL) {
467 if (Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) {
468 printSimpleType(Out, Ty, isSigned, NameSoFar);
472 switch (Ty->getTypeID()) {
473 case Type::FunctionTyID: {
474 FunctionType *FTy = cast<FunctionType>(Ty);
476 raw_string_ostream FunctionInnards(tstr);
477 FunctionInnards << " (" << NameSoFar << ") (";
479 for (FunctionType::param_iterator I = FTy->param_begin(),
480 E = FTy->param_end(); I != E; ++I) {
482 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
483 assert(ArgTy->isPointerTy());
484 ArgTy = cast<PointerType>(ArgTy)->getElementType();
486 if (I != FTy->param_begin())
487 FunctionInnards << ", ";
488 printType(FunctionInnards, ArgTy,
489 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
492 if (FTy->isVarArg()) {
493 if (!FTy->getNumParams())
494 FunctionInnards << " int"; //dummy argument for empty vaarg functs
495 FunctionInnards << ", ...";
496 } else if (!FTy->getNumParams()) {
497 FunctionInnards << "void";
499 FunctionInnards << ')';
500 printType(Out, FTy->getReturnType(),
501 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
504 case Type::StructTyID: {
505 StructType *STy = cast<StructType>(Ty);
507 // Check to see if the type is named.
509 return Out << getStructName(STy) << ' ' << NameSoFar;
511 Out << NameSoFar + " {\n";
513 for (StructType::element_iterator I = STy->element_begin(),
514 E = STy->element_end(); I != E; ++I) {
516 printType(Out, *I, false, "field" + utostr(Idx++));
521 Out << " __attribute__ ((packed))";
525 case Type::PointerTyID: {
526 PointerType *PTy = cast<PointerType>(Ty);
527 std::string ptrName = "*" + NameSoFar;
529 if (PTy->getElementType()->isArrayTy() ||
530 PTy->getElementType()->isVectorTy())
531 ptrName = "(" + ptrName + ")";
534 // Must be a function ptr cast!
535 return printType(Out, PTy->getElementType(), false, ptrName, true, PAL);
536 return printType(Out, PTy->getElementType(), false, ptrName);
539 case Type::ArrayTyID: {
540 ArrayType *ATy = cast<ArrayType>(Ty);
541 unsigned NumElements = ATy->getNumElements();
542 if (NumElements == 0) NumElements = 1;
543 // Arrays are wrapped in structs to allow them to have normal
544 // value semantics (avoiding the array "decay").
545 Out << NameSoFar << " { ";
546 printType(Out, ATy->getElementType(), false,
547 "array[" + utostr(NumElements) + "]");
552 llvm_unreachable("Unhandled case in getTypeProps!");
558 void CWriter::printConstantArray(ConstantArray *CPA, bool Static) {
560 // As a special case, print the array as a string if it is an array of
561 // ubytes or an array of sbytes with positive values.
563 Type *ETy = CPA->getType()->getElementType();
564 bool isString = (ETy == Type::getInt8Ty(CPA->getContext()) ||
565 ETy == Type::getInt8Ty(CPA->getContext()));
567 // Make sure the last character is a null char, as automatically added by C
568 if (isString && (CPA->getNumOperands() == 0 ||
569 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
574 // Keep track of whether the last number was a hexadecimal escape.
575 bool LastWasHex = false;
577 // Do not include the last character, which we know is null
578 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
579 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
581 // Print it out literally if it is a printable character. The only thing
582 // to be careful about is when the last letter output was a hex escape
583 // code, in which case we have to be careful not to print out hex digits
584 // explicitly (the C compiler thinks it is a continuation of the previous
585 // character, sheesh...)
587 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
589 if (C == '"' || C == '\\')
590 Out << "\\" << (char)C;
596 case '\n': Out << "\\n"; break;
597 case '\t': Out << "\\t"; break;
598 case '\r': Out << "\\r"; break;
599 case '\v': Out << "\\v"; break;
600 case '\a': Out << "\\a"; break;
601 case '\"': Out << "\\\""; break;
602 case '\'': Out << "\\\'"; break;
605 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
606 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
615 if (CPA->getNumOperands()) {
617 printConstant(cast<Constant>(CPA->getOperand(0)), Static);
618 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
620 printConstant(cast<Constant>(CPA->getOperand(i)), Static);
627 void CWriter::printConstantVector(ConstantVector *CP, bool Static) {
629 if (CP->getNumOperands()) {
631 printConstant(cast<Constant>(CP->getOperand(0)), Static);
632 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
634 printConstant(cast<Constant>(CP->getOperand(i)), Static);
640 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
641 // textually as a double (rather than as a reference to a stack-allocated
642 // variable). We decide this by converting CFP to a string and back into a
643 // double, and then checking whether the conversion results in a bit-equal
644 // double to the original value of CFP. This depends on us and the target C
645 // compiler agreeing on the conversion process (which is pretty likely since we
646 // only deal in IEEE FP).
648 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
650 // Do long doubles in hex for now.
651 if (CFP->getType() != Type::getFloatTy(CFP->getContext()) &&
652 CFP->getType() != Type::getDoubleTy(CFP->getContext()))
654 APFloat APF = APFloat(CFP->getValueAPF()); // copy
655 if (CFP->getType() == Type::getFloatTy(CFP->getContext()))
656 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &ignored);
657 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
659 sprintf(Buffer, "%a", APF.convertToDouble());
660 if (!strncmp(Buffer, "0x", 2) ||
661 !strncmp(Buffer, "-0x", 3) ||
662 !strncmp(Buffer, "+0x", 3))
663 return APF.bitwiseIsEqual(APFloat(atof(Buffer)));
666 std::string StrVal = ftostr(APF);
668 while (StrVal[0] == ' ')
669 StrVal.erase(StrVal.begin());
671 // Check to make sure that the stringized number is not some string like "Inf"
672 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
673 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
674 ((StrVal[0] == '-' || StrVal[0] == '+') &&
675 (StrVal[1] >= '0' && StrVal[1] <= '9')))
676 // Reparse stringized version!
677 return APF.bitwiseIsEqual(APFloat(atof(StrVal.c_str())));
682 /// Print out the casting for a cast operation. This does the double casting
683 /// necessary for conversion to the destination type, if necessary.
684 /// @brief Print a cast
685 void CWriter::printCast(unsigned opc, Type *SrcTy, Type *DstTy) {
686 // Print the destination type cast
688 case Instruction::UIToFP:
689 case Instruction::SIToFP:
690 case Instruction::IntToPtr:
691 case Instruction::Trunc:
692 case Instruction::BitCast:
693 case Instruction::FPExt:
694 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
696 printType(Out, DstTy);
699 case Instruction::ZExt:
700 case Instruction::PtrToInt:
701 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
703 printSimpleType(Out, DstTy, false);
706 case Instruction::SExt:
707 case Instruction::FPToSI: // For these, make sure we get a signed dest
709 printSimpleType(Out, DstTy, true);
713 llvm_unreachable("Invalid cast opcode");
716 // Print the source type cast
718 case Instruction::UIToFP:
719 case Instruction::ZExt:
721 printSimpleType(Out, SrcTy, false);
724 case Instruction::SIToFP:
725 case Instruction::SExt:
727 printSimpleType(Out, SrcTy, true);
730 case Instruction::IntToPtr:
731 case Instruction::PtrToInt:
732 // Avoid "cast to pointer from integer of different size" warnings
733 Out << "(unsigned long)";
735 case Instruction::Trunc:
736 case Instruction::BitCast:
737 case Instruction::FPExt:
738 case Instruction::FPTrunc:
739 case Instruction::FPToSI:
740 case Instruction::FPToUI:
741 break; // These don't need a source cast.
743 llvm_unreachable("Invalid cast opcode");
748 // printConstant - The LLVM Constant to C Constant converter.
749 void CWriter::printConstant(Constant *CPV, bool Static) {
750 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
751 switch (CE->getOpcode()) {
752 case Instruction::Trunc:
753 case Instruction::ZExt:
754 case Instruction::SExt:
755 case Instruction::FPTrunc:
756 case Instruction::FPExt:
757 case Instruction::UIToFP:
758 case Instruction::SIToFP:
759 case Instruction::FPToUI:
760 case Instruction::FPToSI:
761 case Instruction::PtrToInt:
762 case Instruction::IntToPtr:
763 case Instruction::BitCast:
765 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
766 if (CE->getOpcode() == Instruction::SExt &&
767 CE->getOperand(0)->getType() == Type::getInt1Ty(CPV->getContext())) {
768 // Make sure we really sext from bool here by subtracting from 0
771 printConstant(CE->getOperand(0), Static);
772 if (CE->getType() == Type::getInt1Ty(CPV->getContext()) &&
773 (CE->getOpcode() == Instruction::Trunc ||
774 CE->getOpcode() == Instruction::FPToUI ||
775 CE->getOpcode() == Instruction::FPToSI ||
776 CE->getOpcode() == Instruction::PtrToInt)) {
777 // Make sure we really truncate to bool here by anding with 1
783 case Instruction::GetElementPtr:
785 printGEPExpression(CE->getOperand(0), gep_type_begin(CPV),
786 gep_type_end(CPV), Static);
789 case Instruction::Select:
791 printConstant(CE->getOperand(0), Static);
793 printConstant(CE->getOperand(1), Static);
795 printConstant(CE->getOperand(2), Static);
798 case Instruction::Add:
799 case Instruction::FAdd:
800 case Instruction::Sub:
801 case Instruction::FSub:
802 case Instruction::Mul:
803 case Instruction::FMul:
804 case Instruction::SDiv:
805 case Instruction::UDiv:
806 case Instruction::FDiv:
807 case Instruction::URem:
808 case Instruction::SRem:
809 case Instruction::FRem:
810 case Instruction::And:
811 case Instruction::Or:
812 case Instruction::Xor:
813 case Instruction::ICmp:
814 case Instruction::Shl:
815 case Instruction::LShr:
816 case Instruction::AShr:
819 bool NeedsClosingParens = printConstExprCast(CE, Static);
820 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
821 switch (CE->getOpcode()) {
822 case Instruction::Add:
823 case Instruction::FAdd: Out << " + "; break;
824 case Instruction::Sub:
825 case Instruction::FSub: Out << " - "; break;
826 case Instruction::Mul:
827 case Instruction::FMul: Out << " * "; break;
828 case Instruction::URem:
829 case Instruction::SRem:
830 case Instruction::FRem: Out << " % "; break;
831 case Instruction::UDiv:
832 case Instruction::SDiv:
833 case Instruction::FDiv: Out << " / "; break;
834 case Instruction::And: Out << " & "; break;
835 case Instruction::Or: Out << " | "; break;
836 case Instruction::Xor: Out << " ^ "; break;
837 case Instruction::Shl: Out << " << "; break;
838 case Instruction::LShr:
839 case Instruction::AShr: Out << " >> "; break;
840 case Instruction::ICmp:
841 switch (CE->getPredicate()) {
842 case ICmpInst::ICMP_EQ: Out << " == "; break;
843 case ICmpInst::ICMP_NE: Out << " != "; break;
844 case ICmpInst::ICMP_SLT:
845 case ICmpInst::ICMP_ULT: Out << " < "; break;
846 case ICmpInst::ICMP_SLE:
847 case ICmpInst::ICMP_ULE: Out << " <= "; break;
848 case ICmpInst::ICMP_SGT:
849 case ICmpInst::ICMP_UGT: Out << " > "; break;
850 case ICmpInst::ICMP_SGE:
851 case ICmpInst::ICMP_UGE: Out << " >= "; break;
852 default: llvm_unreachable("Illegal ICmp predicate");
855 default: llvm_unreachable("Illegal opcode here!");
857 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
858 if (NeedsClosingParens)
863 case Instruction::FCmp: {
865 bool NeedsClosingParens = printConstExprCast(CE, Static);
866 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
868 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
872 switch (CE->getPredicate()) {
873 default: llvm_unreachable("Illegal FCmp predicate");
874 case FCmpInst::FCMP_ORD: op = "ord"; break;
875 case FCmpInst::FCMP_UNO: op = "uno"; break;
876 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
877 case FCmpInst::FCMP_UNE: op = "une"; break;
878 case FCmpInst::FCMP_ULT: op = "ult"; break;
879 case FCmpInst::FCMP_ULE: op = "ule"; break;
880 case FCmpInst::FCMP_UGT: op = "ugt"; break;
881 case FCmpInst::FCMP_UGE: op = "uge"; break;
882 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
883 case FCmpInst::FCMP_ONE: op = "one"; break;
884 case FCmpInst::FCMP_OLT: op = "olt"; break;
885 case FCmpInst::FCMP_OLE: op = "ole"; break;
886 case FCmpInst::FCMP_OGT: op = "ogt"; break;
887 case FCmpInst::FCMP_OGE: op = "oge"; break;
889 Out << "llvm_fcmp_" << op << "(";
890 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
892 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
895 if (NeedsClosingParens)
902 errs() << "CWriter Error: Unhandled constant expression: "
907 } else if (isa<UndefValue>(CPV) && CPV->getType()->isSingleValueType()) {
909 printType(Out, CPV->getType()); // sign doesn't matter
911 if (!CPV->getType()->isVectorTy()) {
919 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
920 Type* Ty = CI->getType();
921 if (Ty == Type::getInt1Ty(CPV->getContext()))
922 Out << (CI->getZExtValue() ? '1' : '0');
923 else if (Ty == Type::getInt32Ty(CPV->getContext()))
924 Out << CI->getZExtValue() << 'u';
925 else if (Ty->getPrimitiveSizeInBits() > 32)
926 Out << CI->getZExtValue() << "ull";
929 printSimpleType(Out, Ty, false) << ')';
930 if (CI->isMinValue(true))
931 Out << CI->getZExtValue() << 'u';
933 Out << CI->getSExtValue();
939 switch (CPV->getType()->getTypeID()) {
940 case Type::FloatTyID:
941 case Type::DoubleTyID:
942 case Type::X86_FP80TyID:
943 case Type::PPC_FP128TyID:
944 case Type::FP128TyID: {
945 ConstantFP *FPC = cast<ConstantFP>(CPV);
946 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
947 if (I != FPConstantMap.end()) {
948 // Because of FP precision problems we must load from a stack allocated
949 // value that holds the value in hex.
950 Out << "(*(" << (FPC->getType() == Type::getFloatTy(CPV->getContext()) ?
952 FPC->getType() == Type::getDoubleTy(CPV->getContext()) ?
955 << "*)&FPConstant" << I->second << ')';
958 if (FPC->getType() == Type::getFloatTy(CPV->getContext()))
959 V = FPC->getValueAPF().convertToFloat();
960 else if (FPC->getType() == Type::getDoubleTy(CPV->getContext()))
961 V = FPC->getValueAPF().convertToDouble();
963 // Long double. Convert the number to double, discarding precision.
964 // This is not awesome, but it at least makes the CBE output somewhat
966 APFloat Tmp = FPC->getValueAPF();
968 Tmp.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &LosesInfo);
969 V = Tmp.convertToDouble();
975 // FIXME the actual NaN bits should be emitted.
976 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
978 const unsigned long QuietNaN = 0x7ff8UL;
979 //const unsigned long SignalNaN = 0x7ff4UL;
981 // We need to grab the first part of the FP #
984 uint64_t ll = DoubleToBits(V);
985 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
987 std::string Num(&Buffer[0], &Buffer[6]);
988 unsigned long Val = strtoul(Num.c_str(), 0, 16);
990 if (FPC->getType() == Type::getFloatTy(FPC->getContext()))
991 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
992 << Buffer << "\") /*nan*/ ";
994 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
995 << Buffer << "\") /*nan*/ ";
996 } else if (IsInf(V)) {
998 if (V < 0) Out << '-';
1000 (FPC->getType() == Type::getFloatTy(FPC->getContext()) ? "F" : "")
1004 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
1005 // Print out the constant as a floating point number.
1007 sprintf(Buffer, "%a", V);
1010 Num = ftostr(FPC->getValueAPF());
1018 case Type::ArrayTyID:
1019 // Use C99 compound expression literal initializer syntax.
1022 printType(Out, CPV->getType());
1025 Out << "{ "; // Arrays are wrapped in struct types.
1026 if (ConstantArray *CA = dyn_cast<ConstantArray>(CPV)) {
1027 printConstantArray(CA, Static);
1029 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1030 ArrayType *AT = cast<ArrayType>(CPV->getType());
1032 if (AT->getNumElements()) {
1034 Constant *CZ = Constant::getNullValue(AT->getElementType());
1035 printConstant(CZ, Static);
1036 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
1038 printConstant(CZ, Static);
1043 Out << " }"; // Arrays are wrapped in struct types.
1046 case Type::VectorTyID:
1047 // Use C99 compound expression literal initializer syntax.
1050 printType(Out, CPV->getType());
1053 if (ConstantVector *CV = dyn_cast<ConstantVector>(CPV)) {
1054 printConstantVector(CV, Static);
1056 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1057 VectorType *VT = cast<VectorType>(CPV->getType());
1059 Constant *CZ = Constant::getNullValue(VT->getElementType());
1060 printConstant(CZ, Static);
1061 for (unsigned i = 1, e = VT->getNumElements(); i != e; ++i) {
1063 printConstant(CZ, Static);
1069 case Type::StructTyID:
1070 // Use C99 compound expression literal initializer syntax.
1073 printType(Out, CPV->getType());
1076 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
1077 StructType *ST = cast<StructType>(CPV->getType());
1079 if (ST->getNumElements()) {
1081 printConstant(Constant::getNullValue(ST->getElementType(0)), Static);
1082 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
1084 printConstant(Constant::getNullValue(ST->getElementType(i)), Static);
1090 if (CPV->getNumOperands()) {
1092 printConstant(cast<Constant>(CPV->getOperand(0)), Static);
1093 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
1095 printConstant(cast<Constant>(CPV->getOperand(i)), Static);
1102 case Type::PointerTyID:
1103 if (isa<ConstantPointerNull>(CPV)) {
1105 printType(Out, CPV->getType()); // sign doesn't matter
1106 Out << ")/*NULL*/0)";
1108 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
1109 writeOperand(GV, Static);
1115 errs() << "Unknown constant type: " << *CPV << "\n";
1117 llvm_unreachable(0);
1121 // Some constant expressions need to be casted back to the original types
1122 // because their operands were casted to the expected type. This function takes
1123 // care of detecting that case and printing the cast for the ConstantExpr.
1124 bool CWriter::printConstExprCast(const ConstantExpr* CE, bool Static) {
1125 bool NeedsExplicitCast = false;
1126 Type *Ty = CE->getOperand(0)->getType();
1127 bool TypeIsSigned = false;
1128 switch (CE->getOpcode()) {
1129 case Instruction::Add:
1130 case Instruction::Sub:
1131 case Instruction::Mul:
1132 // We need to cast integer arithmetic so that it is always performed
1133 // as unsigned, to avoid undefined behavior on overflow.
1134 case Instruction::LShr:
1135 case Instruction::URem:
1136 case Instruction::UDiv: NeedsExplicitCast = true; break;
1137 case Instruction::AShr:
1138 case Instruction::SRem:
1139 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1140 case Instruction::SExt:
1142 NeedsExplicitCast = true;
1143 TypeIsSigned = true;
1145 case Instruction::ZExt:
1146 case Instruction::Trunc:
1147 case Instruction::FPTrunc:
1148 case Instruction::FPExt:
1149 case Instruction::UIToFP:
1150 case Instruction::SIToFP:
1151 case Instruction::FPToUI:
1152 case Instruction::FPToSI:
1153 case Instruction::PtrToInt:
1154 case Instruction::IntToPtr:
1155 case Instruction::BitCast:
1157 NeedsExplicitCast = true;
1161 if (NeedsExplicitCast) {
1163 if (Ty->isIntegerTy() && Ty != Type::getInt1Ty(Ty->getContext()))
1164 printSimpleType(Out, Ty, TypeIsSigned);
1166 printType(Out, Ty); // not integer, sign doesn't matter
1169 return NeedsExplicitCast;
1172 // Print a constant assuming that it is the operand for a given Opcode. The
1173 // opcodes that care about sign need to cast their operands to the expected
1174 // type before the operation proceeds. This function does the casting.
1175 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1177 // Extract the operand's type, we'll need it.
1178 Type* OpTy = CPV->getType();
1180 // Indicate whether to do the cast or not.
1181 bool shouldCast = false;
1182 bool typeIsSigned = false;
1184 // Based on the Opcode for which this Constant is being written, determine
1185 // the new type to which the operand should be casted by setting the value
1186 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1190 // for most instructions, it doesn't matter
1192 case Instruction::Add:
1193 case Instruction::Sub:
1194 case Instruction::Mul:
1195 // We need to cast integer arithmetic so that it is always performed
1196 // as unsigned, to avoid undefined behavior on overflow.
1197 case Instruction::LShr:
1198 case Instruction::UDiv:
1199 case Instruction::URem:
1202 case Instruction::AShr:
1203 case Instruction::SDiv:
1204 case Instruction::SRem:
1206 typeIsSigned = true;
1210 // Write out the casted constant if we should, otherwise just write the
1214 printSimpleType(Out, OpTy, typeIsSigned);
1216 printConstant(CPV, false);
1219 printConstant(CPV, false);
1222 std::string CWriter::GetValueName(const Value *Operand) {
1224 // Resolve potential alias.
1225 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(Operand)) {
1226 if (const Value *V = GA->resolveAliasedGlobal(false))
1230 // Mangle globals with the standard mangler interface for LLC compatibility.
1231 if (const GlobalValue *GV = dyn_cast<GlobalValue>(Operand)) {
1232 SmallString<128> Str;
1233 Mang->getNameWithPrefix(Str, GV, false);
1234 return CBEMangle(Str.str().str());
1237 std::string Name = Operand->getName();
1239 if (Name.empty()) { // Assign unique names to local temporaries.
1240 unsigned &No = AnonValueNumbers[Operand];
1242 No = ++NextAnonValueNumber;
1243 Name = "tmp__" + utostr(No);
1246 std::string VarName;
1247 VarName.reserve(Name.capacity());
1249 for (std::string::iterator I = Name.begin(), E = Name.end();
1253 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1254 (ch >= '0' && ch <= '9') || ch == '_')) {
1256 sprintf(buffer, "_%x_", ch);
1262 return "llvm_cbe_" + VarName;
1265 /// writeInstComputationInline - Emit the computation for the specified
1266 /// instruction inline, with no destination provided.
1267 void CWriter::writeInstComputationInline(Instruction &I) {
1268 // We can't currently support integer types other than 1, 8, 16, 32, 64.
1270 Type *Ty = I.getType();
1271 if (Ty->isIntegerTy() && (Ty!=Type::getInt1Ty(I.getContext()) &&
1272 Ty!=Type::getInt8Ty(I.getContext()) &&
1273 Ty!=Type::getInt16Ty(I.getContext()) &&
1274 Ty!=Type::getInt32Ty(I.getContext()) &&
1275 Ty!=Type::getInt64Ty(I.getContext()))) {
1276 report_fatal_error("The C backend does not currently support integer "
1277 "types of widths other than 1, 8, 16, 32, 64.\n"
1278 "This is being tracked as PR 4158.");
1281 // If this is a non-trivial bool computation, make sure to truncate down to
1282 // a 1 bit value. This is important because we want "add i1 x, y" to return
1283 // "0" when x and y are true, not "2" for example.
1284 bool NeedBoolTrunc = false;
1285 if (I.getType() == Type::getInt1Ty(I.getContext()) &&
1286 !isa<ICmpInst>(I) && !isa<FCmpInst>(I))
1287 NeedBoolTrunc = true;
1299 void CWriter::writeOperandInternal(Value *Operand, bool Static) {
1300 if (Instruction *I = dyn_cast<Instruction>(Operand))
1301 // Should we inline this instruction to build a tree?
1302 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1304 writeInstComputationInline(*I);
1309 Constant* CPV = dyn_cast<Constant>(Operand);
1311 if (CPV && !isa<GlobalValue>(CPV))
1312 printConstant(CPV, Static);
1314 Out << GetValueName(Operand);
1317 void CWriter::writeOperand(Value *Operand, bool Static) {
1318 bool isAddressImplicit = isAddressExposed(Operand);
1319 if (isAddressImplicit)
1320 Out << "(&"; // Global variables are referenced as their addresses by llvm
1322 writeOperandInternal(Operand, Static);
1324 if (isAddressImplicit)
1328 // Some instructions need to have their result value casted back to the
1329 // original types because their operands were casted to the expected type.
1330 // This function takes care of detecting that case and printing the cast
1331 // for the Instruction.
1332 bool CWriter::writeInstructionCast(const Instruction &I) {
1333 Type *Ty = I.getOperand(0)->getType();
1334 switch (I.getOpcode()) {
1335 case Instruction::Add:
1336 case Instruction::Sub:
1337 case Instruction::Mul:
1338 // We need to cast integer arithmetic so that it is always performed
1339 // as unsigned, to avoid undefined behavior on overflow.
1340 case Instruction::LShr:
1341 case Instruction::URem:
1342 case Instruction::UDiv:
1344 printSimpleType(Out, Ty, false);
1347 case Instruction::AShr:
1348 case Instruction::SRem:
1349 case Instruction::SDiv:
1351 printSimpleType(Out, Ty, true);
1359 // Write the operand with a cast to another type based on the Opcode being used.
1360 // This will be used in cases where an instruction has specific type
1361 // requirements (usually signedness) for its operands.
1362 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1364 // Extract the operand's type, we'll need it.
1365 Type* OpTy = Operand->getType();
1367 // Indicate whether to do the cast or not.
1368 bool shouldCast = false;
1370 // Indicate whether the cast should be to a signed type or not.
1371 bool castIsSigned = false;
1373 // Based on the Opcode for which this Operand is being written, determine
1374 // the new type to which the operand should be casted by setting the value
1375 // of OpTy. If we change OpTy, also set shouldCast to true.
1378 // for most instructions, it doesn't matter
1380 case Instruction::Add:
1381 case Instruction::Sub:
1382 case Instruction::Mul:
1383 // We need to cast integer arithmetic so that it is always performed
1384 // as unsigned, to avoid undefined behavior on overflow.
1385 case Instruction::LShr:
1386 case Instruction::UDiv:
1387 case Instruction::URem: // Cast to unsigned first
1389 castIsSigned = false;
1391 case Instruction::GetElementPtr:
1392 case Instruction::AShr:
1393 case Instruction::SDiv:
1394 case Instruction::SRem: // Cast to signed first
1396 castIsSigned = true;
1400 // Write out the casted operand if we should, otherwise just write the
1404 printSimpleType(Out, OpTy, castIsSigned);
1406 writeOperand(Operand);
1409 writeOperand(Operand);
1412 // Write the operand with a cast to another type based on the icmp predicate
1414 void CWriter::writeOperandWithCast(Value* Operand, const ICmpInst &Cmp) {
1415 // This has to do a cast to ensure the operand has the right signedness.
1416 // Also, if the operand is a pointer, we make sure to cast to an integer when
1417 // doing the comparison both for signedness and so that the C compiler doesn't
1418 // optimize things like "p < NULL" to false (p may contain an integer value
1420 bool shouldCast = Cmp.isRelational();
1422 // Write out the casted operand if we should, otherwise just write the
1425 writeOperand(Operand);
1429 // Should this be a signed comparison? If so, convert to signed.
1430 bool castIsSigned = Cmp.isSigned();
1432 // If the operand was a pointer, convert to a large integer type.
1433 Type* OpTy = Operand->getType();
1434 if (OpTy->isPointerTy())
1435 OpTy = TD->getIntPtrType(Operand->getContext());
1438 printSimpleType(Out, OpTy, castIsSigned);
1440 writeOperand(Operand);
1444 // generateCompilerSpecificCode - This is where we add conditional compilation
1445 // directives to cater to specific compilers as need be.
1447 static void generateCompilerSpecificCode(formatted_raw_ostream& Out,
1448 const TargetData *TD) {
1449 // Alloca is hard to get, and we don't want to include stdlib.h here.
1450 Out << "/* get a declaration for alloca */\n"
1451 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1452 << "#define alloca(x) __builtin_alloca((x))\n"
1453 << "#define _alloca(x) __builtin_alloca((x))\n"
1454 << "#elif defined(__APPLE__)\n"
1455 << "extern void *__builtin_alloca(unsigned long);\n"
1456 << "#define alloca(x) __builtin_alloca(x)\n"
1457 << "#define longjmp _longjmp\n"
1458 << "#define setjmp _setjmp\n"
1459 << "#elif defined(__sun__)\n"
1460 << "#if defined(__sparcv9)\n"
1461 << "extern void *__builtin_alloca(unsigned long);\n"
1463 << "extern void *__builtin_alloca(unsigned int);\n"
1465 << "#define alloca(x) __builtin_alloca(x)\n"
1466 << "#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__arm__)\n"
1467 << "#define alloca(x) __builtin_alloca(x)\n"
1468 << "#elif defined(_MSC_VER)\n"
1469 << "#define inline _inline\n"
1470 << "#define alloca(x) _alloca(x)\n"
1472 << "#include <alloca.h>\n"
1475 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1476 // If we aren't being compiled with GCC, just drop these attributes.
1477 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1478 << "#define __attribute__(X)\n"
1481 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1482 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1483 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1484 << "#elif defined(__GNUC__)\n"
1485 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1487 << "#define __EXTERNAL_WEAK__\n"
1490 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1491 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1492 << "#define __ATTRIBUTE_WEAK__\n"
1493 << "#elif defined(__GNUC__)\n"
1494 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1496 << "#define __ATTRIBUTE_WEAK__\n"
1499 // Add hidden visibility support. FIXME: APPLE_CC?
1500 Out << "#if defined(__GNUC__)\n"
1501 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1504 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1505 // From the GCC documentation:
1507 // double __builtin_nan (const char *str)
1509 // This is an implementation of the ISO C99 function nan.
1511 // Since ISO C99 defines this function in terms of strtod, which we do
1512 // not implement, a description of the parsing is in order. The string is
1513 // parsed as by strtol; that is, the base is recognized by leading 0 or
1514 // 0x prefixes. The number parsed is placed in the significand such that
1515 // the least significant bit of the number is at the least significant
1516 // bit of the significand. The number is truncated to fit the significand
1517 // field provided. The significand is forced to be a quiet NaN.
1519 // This function, if given a string literal, is evaluated early enough
1520 // that it is considered a compile-time constant.
1522 // float __builtin_nanf (const char *str)
1524 // Similar to __builtin_nan, except the return type is float.
1526 // double __builtin_inf (void)
1528 // Similar to __builtin_huge_val, except a warning is generated if the
1529 // target floating-point format does not support infinities. This
1530 // function is suitable for implementing the ISO C99 macro INFINITY.
1532 // float __builtin_inff (void)
1534 // Similar to __builtin_inf, except the return type is float.
1535 Out << "#ifdef __GNUC__\n"
1536 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1537 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1538 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1539 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1540 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1541 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1542 << "#define LLVM_PREFETCH(addr,rw,locality) "
1543 "__builtin_prefetch(addr,rw,locality)\n"
1544 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1545 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1546 << "#define LLVM_ASM __asm__\n"
1548 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1549 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1550 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1551 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1552 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1553 << "#define LLVM_INFF 0.0F /* Float */\n"
1554 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1555 << "#define __ATTRIBUTE_CTOR__\n"
1556 << "#define __ATTRIBUTE_DTOR__\n"
1557 << "#define LLVM_ASM(X)\n"
1560 Out << "#if __GNUC__ < 4 /* Old GCC's, or compilers not GCC */ \n"
1561 << "#define __builtin_stack_save() 0 /* not implemented */\n"
1562 << "#define __builtin_stack_restore(X) /* noop */\n"
1565 // Output typedefs for 128-bit integers. If these are needed with a
1566 // 32-bit target or with a C compiler that doesn't support mode(TI),
1567 // more drastic measures will be needed.
1568 Out << "#if __GNUC__ && __LP64__ /* 128-bit integer types */\n"
1569 << "typedef int __attribute__((mode(TI))) llvmInt128;\n"
1570 << "typedef unsigned __attribute__((mode(TI))) llvmUInt128;\n"
1573 // Output target-specific code that should be inserted into main.
1574 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1577 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1578 /// the StaticTors set.
1579 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1580 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1581 if (!InitList) return;
1583 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1584 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1585 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1587 if (CS->getOperand(1)->isNullValue())
1588 return; // Found a null terminator, exit printing.
1589 Constant *FP = CS->getOperand(1);
1590 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1592 FP = CE->getOperand(0);
1593 if (Function *F = dyn_cast<Function>(FP))
1594 StaticTors.insert(F);
1598 enum SpecialGlobalClass {
1600 GlobalCtors, GlobalDtors,
1604 /// getGlobalVariableClass - If this is a global that is specially recognized
1605 /// by LLVM, return a code that indicates how we should handle it.
1606 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1607 // If this is a global ctors/dtors list, handle it now.
1608 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1609 if (GV->getName() == "llvm.global_ctors")
1611 else if (GV->getName() == "llvm.global_dtors")
1615 // Otherwise, if it is other metadata, don't print it. This catches things
1616 // like debug information.
1617 if (GV->getSection() == "llvm.metadata")
1623 // PrintEscapedString - Print each character of the specified string, escaping
1624 // it if it is not printable or if it is an escape char.
1625 static void PrintEscapedString(const char *Str, unsigned Length,
1627 for (unsigned i = 0; i != Length; ++i) {
1628 unsigned char C = Str[i];
1629 if (isprint(C) && C != '\\' && C != '"')
1638 Out << "\\x" << hexdigit(C >> 4) << hexdigit(C & 0x0F);
1642 // PrintEscapedString - Print each character of the specified string, escaping
1643 // it if it is not printable or if it is an escape char.
1644 static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
1645 PrintEscapedString(Str.c_str(), Str.size(), Out);
1648 bool CWriter::doInitialization(Module &M) {
1649 FunctionPass::doInitialization(M);
1654 TD = new TargetData(&M);
1655 IL = new IntrinsicLowering(*TD);
1656 IL->AddPrototypes(M);
1659 std::string Triple = TheModule->getTargetTriple();
1661 Triple = llvm::sys::getHostTriple();
1664 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
1665 TAsm = Match->createMCAsmInfo(Triple);
1667 TAsm = new CBEMCAsmInfo();
1668 MRI = new MCRegisterInfo();
1669 TCtx = new MCContext(*TAsm, *MRI, NULL);
1670 Mang = new Mangler(*TCtx, *TD);
1672 // Keep track of which functions are static ctors/dtors so they can have
1673 // an attribute added to their prototypes.
1674 std::set<Function*> StaticCtors, StaticDtors;
1675 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1677 switch (getGlobalVariableClass(I)) {
1680 FindStaticTors(I, StaticCtors);
1683 FindStaticTors(I, StaticDtors);
1688 // get declaration for alloca
1689 Out << "/* Provide Declarations */\n";
1690 Out << "#include <stdarg.h>\n"; // Varargs support
1691 Out << "#include <setjmp.h>\n"; // Unwind support
1692 Out << "#include <limits.h>\n"; // With overflow intrinsics support.
1693 generateCompilerSpecificCode(Out, TD);
1695 // Provide a definition for `bool' if not compiling with a C++ compiler.
1697 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1699 << "\n\n/* Support for floating point constants */\n"
1700 << "typedef unsigned long long ConstantDoubleTy;\n"
1701 << "typedef unsigned int ConstantFloatTy;\n"
1702 << "typedef struct { unsigned long long f1; unsigned short f2; "
1703 "unsigned short pad[3]; } ConstantFP80Ty;\n"
1704 // This is used for both kinds of 128-bit long double; meaning differs.
1705 << "typedef struct { unsigned long long f1; unsigned long long f2; }"
1706 " ConstantFP128Ty;\n"
1707 << "\n\n/* Global Declarations */\n";
1709 // First output all the declarations for the program, because C requires
1710 // Functions & globals to be declared before they are used.
1712 if (!M.getModuleInlineAsm().empty()) {
1713 Out << "/* Module asm statements */\n"
1716 // Split the string into lines, to make it easier to read the .ll file.
1717 std::string Asm = M.getModuleInlineAsm();
1719 size_t NewLine = Asm.find_first_of('\n', CurPos);
1720 while (NewLine != std::string::npos) {
1721 // We found a newline, print the portion of the asm string from the
1722 // last newline up to this newline.
1724 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.begin()+NewLine),
1728 NewLine = Asm.find_first_of('\n', CurPos);
1731 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.end()), Out);
1733 << "/* End Module asm statements */\n";
1736 // Loop over the symbol table, emitting all named constants.
1739 // Global variable declarations...
1740 if (!M.global_empty()) {
1741 Out << "\n/* External Global Variable Declarations */\n";
1742 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1745 if (I->hasExternalLinkage() || I->hasExternalWeakLinkage() ||
1746 I->hasCommonLinkage())
1748 else if (I->hasDLLImportLinkage())
1749 Out << "__declspec(dllimport) ";
1751 continue; // Internal Global
1753 // Thread Local Storage
1754 if (I->isThreadLocal())
1757 printType(Out, I->getType()->getElementType(), false, GetValueName(I));
1759 if (I->hasExternalWeakLinkage())
1760 Out << " __EXTERNAL_WEAK__";
1765 // Function declarations
1766 Out << "\n/* Function Declarations */\n";
1767 Out << "double fmod(double, double);\n"; // Support for FP rem
1768 Out << "float fmodf(float, float);\n";
1769 Out << "long double fmodl(long double, long double);\n";
1771 // Store the intrinsics which will be declared/defined below.
1772 SmallVector<const Function*, 8> intrinsicsToDefine;
1774 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1775 // Don't print declarations for intrinsic functions.
1776 // Store the used intrinsics, which need to be explicitly defined.
1777 if (I->isIntrinsic()) {
1778 switch (I->getIntrinsicID()) {
1781 case Intrinsic::uadd_with_overflow:
1782 case Intrinsic::sadd_with_overflow:
1783 intrinsicsToDefine.push_back(I);
1789 if (I->getName() == "setjmp" ||
1790 I->getName() == "longjmp" || I->getName() == "_setjmp")
1793 if (I->hasExternalWeakLinkage())
1795 printFunctionSignature(I, true);
1796 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1797 Out << " __ATTRIBUTE_WEAK__";
1798 if (I->hasExternalWeakLinkage())
1799 Out << " __EXTERNAL_WEAK__";
1800 if (StaticCtors.count(I))
1801 Out << " __ATTRIBUTE_CTOR__";
1802 if (StaticDtors.count(I))
1803 Out << " __ATTRIBUTE_DTOR__";
1804 if (I->hasHiddenVisibility())
1805 Out << " __HIDDEN__";
1807 if (I->hasName() && I->getName()[0] == 1)
1808 Out << " LLVM_ASM(\"" << I->getName().substr(1) << "\")";
1813 // Output the global variable declarations
1814 if (!M.global_empty()) {
1815 Out << "\n\n/* Global Variable Declarations */\n";
1816 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1818 if (!I->isDeclaration()) {
1819 // Ignore special globals, such as debug info.
1820 if (getGlobalVariableClass(I))
1823 if (I->hasLocalLinkage())
1828 // Thread Local Storage
1829 if (I->isThreadLocal())
1832 printType(Out, I->getType()->getElementType(), false,
1835 if (I->hasLinkOnceLinkage())
1836 Out << " __attribute__((common))";
1837 else if (I->hasCommonLinkage()) // FIXME is this right?
1838 Out << " __ATTRIBUTE_WEAK__";
1839 else if (I->hasWeakLinkage())
1840 Out << " __ATTRIBUTE_WEAK__";
1841 else if (I->hasExternalWeakLinkage())
1842 Out << " __EXTERNAL_WEAK__";
1843 if (I->hasHiddenVisibility())
1844 Out << " __HIDDEN__";
1849 // Output the global variable definitions and contents...
1850 if (!M.global_empty()) {
1851 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1852 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1854 if (!I->isDeclaration()) {
1855 // Ignore special globals, such as debug info.
1856 if (getGlobalVariableClass(I))
1859 if (I->hasLocalLinkage())
1861 else if (I->hasDLLImportLinkage())
1862 Out << "__declspec(dllimport) ";
1863 else if (I->hasDLLExportLinkage())
1864 Out << "__declspec(dllexport) ";
1866 // Thread Local Storage
1867 if (I->isThreadLocal())
1870 printType(Out, I->getType()->getElementType(), false,
1872 if (I->hasLinkOnceLinkage())
1873 Out << " __attribute__((common))";
1874 else if (I->hasWeakLinkage())
1875 Out << " __ATTRIBUTE_WEAK__";
1876 else if (I->hasCommonLinkage())
1877 Out << " __ATTRIBUTE_WEAK__";
1879 if (I->hasHiddenVisibility())
1880 Out << " __HIDDEN__";
1882 // If the initializer is not null, emit the initializer. If it is null,
1883 // we try to avoid emitting large amounts of zeros. The problem with
1884 // this, however, occurs when the variable has weak linkage. In this
1885 // case, the assembler will complain about the variable being both weak
1886 // and common, so we disable this optimization.
1887 // FIXME common linkage should avoid this problem.
1888 if (!I->getInitializer()->isNullValue()) {
1890 writeOperand(I->getInitializer(), true);
1891 } else if (I->hasWeakLinkage()) {
1892 // We have to specify an initializer, but it doesn't have to be
1893 // complete. If the value is an aggregate, print out { 0 }, and let
1894 // the compiler figure out the rest of the zeros.
1896 if (I->getInitializer()->getType()->isStructTy() ||
1897 I->getInitializer()->getType()->isVectorTy()) {
1899 } else if (I->getInitializer()->getType()->isArrayTy()) {
1900 // As with structs and vectors, but with an extra set of braces
1901 // because arrays are wrapped in structs.
1904 // Just print it out normally.
1905 writeOperand(I->getInitializer(), true);
1913 Out << "\n\n/* Function Bodies */\n";
1915 // Emit some helper functions for dealing with FCMP instruction's
1917 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1918 Out << "return X == X && Y == Y; }\n";
1919 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1920 Out << "return X != X || Y != Y; }\n";
1921 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1922 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1923 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1924 Out << "return X != Y; }\n";
1925 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1926 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1927 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1928 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1929 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1930 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1931 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1932 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1933 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1934 Out << "return X == Y ; }\n";
1935 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1936 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1937 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1938 Out << "return X < Y ; }\n";
1939 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1940 Out << "return X > Y ; }\n";
1941 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1942 Out << "return X <= Y ; }\n";
1943 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1944 Out << "return X >= Y ; }\n";
1946 // Emit definitions of the intrinsics.
1947 for (SmallVector<const Function*, 8>::const_iterator
1948 I = intrinsicsToDefine.begin(),
1949 E = intrinsicsToDefine.end(); I != E; ++I) {
1950 printIntrinsicDefinition(**I, Out);
1957 /// Output all floating point constants that cannot be printed accurately...
1958 void CWriter::printFloatingPointConstants(Function &F) {
1959 // Scan the module for floating point constants. If any FP constant is used
1960 // in the function, we want to redirect it here so that we do not depend on
1961 // the precision of the printed form, unless the printed form preserves
1964 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1966 printFloatingPointConstants(*I);
1971 void CWriter::printFloatingPointConstants(const Constant *C) {
1972 // If this is a constant expression, recursively check for constant fp values.
1973 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
1974 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
1975 printFloatingPointConstants(CE->getOperand(i));
1979 // Otherwise, check for a FP constant that we need to print.
1980 const ConstantFP *FPC = dyn_cast<ConstantFP>(C);
1982 // Do not put in FPConstantMap if safe.
1983 isFPCSafeToPrint(FPC) ||
1984 // Already printed this constant?
1985 FPConstantMap.count(FPC))
1988 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1990 if (FPC->getType() == Type::getDoubleTy(FPC->getContext())) {
1991 double Val = FPC->getValueAPF().convertToDouble();
1992 uint64_t i = FPC->getValueAPF().bitcastToAPInt().getZExtValue();
1993 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1994 << " = 0x" << utohexstr(i)
1995 << "ULL; /* " << Val << " */\n";
1996 } else if (FPC->getType() == Type::getFloatTy(FPC->getContext())) {
1997 float Val = FPC->getValueAPF().convertToFloat();
1998 uint32_t i = (uint32_t)FPC->getValueAPF().bitcastToAPInt().
2000 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
2001 << " = 0x" << utohexstr(i)
2002 << "U; /* " << Val << " */\n";
2003 } else if (FPC->getType() == Type::getX86_FP80Ty(FPC->getContext())) {
2004 // api needed to prevent premature destruction
2005 APInt api = FPC->getValueAPF().bitcastToAPInt();
2006 const uint64_t *p = api.getRawData();
2007 Out << "static const ConstantFP80Ty FPConstant" << FPCounter++
2008 << " = { 0x" << utohexstr(p[0])
2009 << "ULL, 0x" << utohexstr((uint16_t)p[1]) << ",{0,0,0}"
2010 << "}; /* Long double constant */\n";
2011 } else if (FPC->getType() == Type::getPPC_FP128Ty(FPC->getContext()) ||
2012 FPC->getType() == Type::getFP128Ty(FPC->getContext())) {
2013 APInt api = FPC->getValueAPF().bitcastToAPInt();
2014 const uint64_t *p = api.getRawData();
2015 Out << "static const ConstantFP128Ty FPConstant" << FPCounter++
2017 << utohexstr(p[0]) << ", 0x" << utohexstr(p[1])
2018 << "}; /* Long double constant */\n";
2021 llvm_unreachable("Unknown float type!");
2026 /// printSymbolTable - Run through symbol table looking for type names. If a
2027 /// type name is found, emit its declaration...
2029 void CWriter::printModuleTypes() {
2030 Out << "/* Helper union for bitcasts */\n";
2031 Out << "typedef union {\n";
2032 Out << " unsigned int Int32;\n";
2033 Out << " unsigned long long Int64;\n";
2034 Out << " float Float;\n";
2035 Out << " double Double;\n";
2036 Out << "} llvmBitCastUnion;\n";
2038 // Get all of the struct types used in the module.
2039 std::vector<StructType*> StructTypes;
2040 TheModule->findUsedStructTypes(StructTypes);
2042 if (StructTypes.empty()) return;
2044 Out << "/* Structure forward decls */\n";
2046 unsigned NextTypeID = 0;
2048 // If any of them are missing names, add a unique ID to UnnamedStructIDs.
2049 // Print out forward declarations for structure types.
2050 for (unsigned i = 0, e = StructTypes.size(); i != e; ++i) {
2051 StructType *ST = StructTypes[i];
2053 if (ST->isAnonymous() || ST->getName().empty())
2054 UnnamedStructIDs[ST] = NextTypeID++;
2056 std::string Name = getStructName(ST);
2058 Out << "typedef struct " << Name << ' ' << Name << ";\n";
2063 // Keep track of which structures have been printed so far.
2064 SmallPtrSet<Type *, 16> StructPrinted;
2066 // Loop over all structures then push them into the stack so they are
2067 // printed in the correct order.
2069 Out << "/* Structure contents */\n";
2070 for (unsigned i = 0, e = StructTypes.size(); i != e; ++i)
2071 if (StructTypes[i]->isStructTy())
2072 // Only print out used types!
2073 printContainedStructs(StructTypes[i], StructPrinted);
2076 // Push the struct onto the stack and recursively push all structs
2077 // this one depends on.
2079 // TODO: Make this work properly with vector types
2081 void CWriter::printContainedStructs(Type *Ty,
2082 SmallPtrSet<Type *, 16> &StructPrinted) {
2083 // Don't walk through pointers.
2084 if (Ty->isPointerTy() || Ty->isPrimitiveType() || Ty->isIntegerTy())
2087 // Print all contained types first.
2088 for (Type::subtype_iterator I = Ty->subtype_begin(),
2089 E = Ty->subtype_end(); I != E; ++I)
2090 printContainedStructs(*I, StructPrinted);
2092 if (StructType *ST = dyn_cast<StructType>(Ty)) {
2093 // Check to see if we have already printed this struct.
2094 if (!StructPrinted.insert(Ty)) return;
2096 // Print structure type out.
2097 printType(Out, ST, false, getStructName(ST), true);
2102 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
2103 /// isStructReturn - Should this function actually return a struct by-value?
2104 bool isStructReturn = F->hasStructRetAttr();
2106 if (F->hasLocalLinkage()) Out << "static ";
2107 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
2108 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
2109 switch (F->getCallingConv()) {
2110 case CallingConv::X86_StdCall:
2111 Out << "__attribute__((stdcall)) ";
2113 case CallingConv::X86_FastCall:
2114 Out << "__attribute__((fastcall)) ";
2116 case CallingConv::X86_ThisCall:
2117 Out << "__attribute__((thiscall)) ";
2123 // Loop over the arguments, printing them...
2124 FunctionType *FT = cast<FunctionType>(F->getFunctionType());
2125 const AttrListPtr &PAL = F->getAttributes();
2128 raw_string_ostream FunctionInnards(tstr);
2130 // Print out the name...
2131 FunctionInnards << GetValueName(F) << '(';
2133 bool PrintedArg = false;
2134 if (!F->isDeclaration()) {
2135 if (!F->arg_empty()) {
2136 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
2139 // If this is a struct-return function, don't print the hidden
2140 // struct-return argument.
2141 if (isStructReturn) {
2142 assert(I != E && "Invalid struct return function!");
2147 std::string ArgName;
2148 for (; I != E; ++I) {
2149 if (PrintedArg) FunctionInnards << ", ";
2150 if (I->hasName() || !Prototype)
2151 ArgName = GetValueName(I);
2154 Type *ArgTy = I->getType();
2155 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2156 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2157 ByValParams.insert(I);
2159 printType(FunctionInnards, ArgTy,
2160 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt),
2167 // Loop over the arguments, printing them.
2168 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
2171 // If this is a struct-return function, don't print the hidden
2172 // struct-return argument.
2173 if (isStructReturn) {
2174 assert(I != E && "Invalid struct return function!");
2179 for (; I != E; ++I) {
2180 if (PrintedArg) FunctionInnards << ", ";
2182 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2183 assert(ArgTy->isPointerTy());
2184 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2186 printType(FunctionInnards, ArgTy,
2187 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt));
2193 if (!PrintedArg && FT->isVarArg()) {
2194 FunctionInnards << "int vararg_dummy_arg";
2198 // Finish printing arguments... if this is a vararg function, print the ...,
2199 // unless there are no known types, in which case, we just emit ().
2201 if (FT->isVarArg() && PrintedArg) {
2202 FunctionInnards << ",..."; // Output varargs portion of signature!
2203 } else if (!FT->isVarArg() && !PrintedArg) {
2204 FunctionInnards << "void"; // ret() -> ret(void) in C.
2206 FunctionInnards << ')';
2208 // Get the return tpe for the function.
2210 if (!isStructReturn)
2211 RetTy = F->getReturnType();
2213 // If this is a struct-return function, print the struct-return type.
2214 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
2217 // Print out the return type and the signature built above.
2218 printType(Out, RetTy,
2219 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt),
2220 FunctionInnards.str());
2223 static inline bool isFPIntBitCast(const Instruction &I) {
2224 if (!isa<BitCastInst>(I))
2226 Type *SrcTy = I.getOperand(0)->getType();
2227 Type *DstTy = I.getType();
2228 return (SrcTy->isFloatingPointTy() && DstTy->isIntegerTy()) ||
2229 (DstTy->isFloatingPointTy() && SrcTy->isIntegerTy());
2232 void CWriter::printFunction(Function &F) {
2233 /// isStructReturn - Should this function actually return a struct by-value?
2234 bool isStructReturn = F.hasStructRetAttr();
2236 printFunctionSignature(&F, false);
2239 // If this is a struct return function, handle the result with magic.
2240 if (isStructReturn) {
2242 cast<PointerType>(F.arg_begin()->getType())->getElementType();
2244 printType(Out, StructTy, false, "StructReturn");
2245 Out << "; /* Struct return temporary */\n";
2248 printType(Out, F.arg_begin()->getType(), false,
2249 GetValueName(F.arg_begin()));
2250 Out << " = &StructReturn;\n";
2253 bool PrintedVar = false;
2255 // print local variable information for the function
2256 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
2257 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
2259 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
2260 Out << "; /* Address-exposed local */\n";
2262 } else if (I->getType() != Type::getVoidTy(F.getContext()) &&
2263 !isInlinableInst(*I)) {
2265 printType(Out, I->getType(), false, GetValueName(&*I));
2268 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
2270 printType(Out, I->getType(), false,
2271 GetValueName(&*I)+"__PHI_TEMPORARY");
2276 // We need a temporary for the BitCast to use so it can pluck a value out
2277 // of a union to do the BitCast. This is separate from the need for a
2278 // variable to hold the result of the BitCast.
2279 if (isFPIntBitCast(*I)) {
2280 Out << " llvmBitCastUnion " << GetValueName(&*I)
2281 << "__BITCAST_TEMPORARY;\n";
2289 if (F.hasExternalLinkage() && F.getName() == "main")
2290 Out << " CODE_FOR_MAIN();\n";
2292 // print the basic blocks
2293 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
2294 if (Loop *L = LI->getLoopFor(BB)) {
2295 if (L->getHeader() == BB && L->getParentLoop() == 0)
2298 printBasicBlock(BB);
2305 void CWriter::printLoop(Loop *L) {
2306 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
2307 << "' to make GCC happy */\n";
2308 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
2309 BasicBlock *BB = L->getBlocks()[i];
2310 Loop *BBLoop = LI->getLoopFor(BB);
2312 printBasicBlock(BB);
2313 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
2316 Out << " } while (1); /* end of syntactic loop '"
2317 << L->getHeader()->getName() << "' */\n";
2320 void CWriter::printBasicBlock(BasicBlock *BB) {
2322 // Don't print the label for the basic block if there are no uses, or if
2323 // the only terminator use is the predecessor basic block's terminator.
2324 // We have to scan the use list because PHI nodes use basic blocks too but
2325 // do not require a label to be generated.
2327 bool NeedsLabel = false;
2328 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
2329 if (isGotoCodeNecessary(*PI, BB)) {
2334 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2336 // Output all of the instructions in the basic block...
2337 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2339 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2340 if (II->getType() != Type::getVoidTy(BB->getContext()) &&
2345 writeInstComputationInline(*II);
2350 // Don't emit prefix or suffix for the terminator.
2351 visit(*BB->getTerminator());
2355 // Specific Instruction type classes... note that all of the casts are
2356 // necessary because we use the instruction classes as opaque types...
2358 void CWriter::visitReturnInst(ReturnInst &I) {
2359 // If this is a struct return function, return the temporary struct.
2360 bool isStructReturn = I.getParent()->getParent()->hasStructRetAttr();
2362 if (isStructReturn) {
2363 Out << " return StructReturn;\n";
2367 // Don't output a void return if this is the last basic block in the function
2368 if (I.getNumOperands() == 0 &&
2369 &*--I.getParent()->getParent()->end() == I.getParent() &&
2370 !I.getParent()->size() == 1) {
2375 if (I.getNumOperands()) {
2377 writeOperand(I.getOperand(0));
2382 void CWriter::visitSwitchInst(SwitchInst &SI) {
2385 writeOperand(SI.getOperand(0));
2386 Out << ") {\n default:\n";
2387 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2388 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2390 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2392 writeOperand(SI.getOperand(i));
2394 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2395 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2396 printBranchToBlock(SI.getParent(), Succ, 2);
2397 if (Function::iterator(Succ) == llvm::next(Function::iterator(SI.getParent())))
2403 void CWriter::visitIndirectBrInst(IndirectBrInst &IBI) {
2404 Out << " goto *(void*)(";
2405 writeOperand(IBI.getOperand(0));
2409 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2410 Out << " /*UNREACHABLE*/;\n";
2413 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2414 /// FIXME: This should be reenabled, but loop reordering safe!!
2417 if (llvm::next(Function::iterator(From)) != Function::iterator(To))
2418 return true; // Not the direct successor, we need a goto.
2420 //isa<SwitchInst>(From->getTerminator())
2422 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2427 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2428 BasicBlock *Successor,
2430 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2431 PHINode *PN = cast<PHINode>(I);
2432 // Now we have to do the printing.
2433 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2434 if (!isa<UndefValue>(IV)) {
2435 Out << std::string(Indent, ' ');
2436 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2438 Out << "; /* for PHI node */\n";
2443 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2445 if (isGotoCodeNecessary(CurBB, Succ)) {
2446 Out << std::string(Indent, ' ') << " goto ";
2452 // Branch instruction printing - Avoid printing out a branch to a basic block
2453 // that immediately succeeds the current one.
2455 void CWriter::visitBranchInst(BranchInst &I) {
2457 if (I.isConditional()) {
2458 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2460 writeOperand(I.getCondition());
2463 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2464 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2466 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2467 Out << " } else {\n";
2468 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2469 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2472 // First goto not necessary, assume second one is...
2474 writeOperand(I.getCondition());
2477 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2478 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2483 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2484 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2489 // PHI nodes get copied into temporary values at the end of predecessor basic
2490 // blocks. We now need to copy these temporary values into the REAL value for
2492 void CWriter::visitPHINode(PHINode &I) {
2494 Out << "__PHI_TEMPORARY";
2498 void CWriter::visitBinaryOperator(Instruction &I) {
2499 // binary instructions, shift instructions, setCond instructions.
2500 assert(!I.getType()->isPointerTy());
2502 // We must cast the results of binary operations which might be promoted.
2503 bool needsCast = false;
2504 if ((I.getType() == Type::getInt8Ty(I.getContext())) ||
2505 (I.getType() == Type::getInt16Ty(I.getContext()))
2506 || (I.getType() == Type::getFloatTy(I.getContext()))) {
2509 printType(Out, I.getType(), false);
2513 // If this is a negation operation, print it out as such. For FP, we don't
2514 // want to print "-0.0 - X".
2515 if (BinaryOperator::isNeg(&I)) {
2517 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2519 } else if (BinaryOperator::isFNeg(&I)) {
2521 writeOperand(BinaryOperator::getFNegArgument(cast<BinaryOperator>(&I)));
2523 } else if (I.getOpcode() == Instruction::FRem) {
2524 // Output a call to fmod/fmodf instead of emitting a%b
2525 if (I.getType() == Type::getFloatTy(I.getContext()))
2527 else if (I.getType() == Type::getDoubleTy(I.getContext()))
2529 else // all 3 flavors of long double
2531 writeOperand(I.getOperand(0));
2533 writeOperand(I.getOperand(1));
2537 // Write out the cast of the instruction's value back to the proper type
2539 bool NeedsClosingParens = writeInstructionCast(I);
2541 // Certain instructions require the operand to be forced to a specific type
2542 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2543 // below for operand 1
2544 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2546 switch (I.getOpcode()) {
2547 case Instruction::Add:
2548 case Instruction::FAdd: Out << " + "; break;
2549 case Instruction::Sub:
2550 case Instruction::FSub: Out << " - "; break;
2551 case Instruction::Mul:
2552 case Instruction::FMul: Out << " * "; break;
2553 case Instruction::URem:
2554 case Instruction::SRem:
2555 case Instruction::FRem: Out << " % "; break;
2556 case Instruction::UDiv:
2557 case Instruction::SDiv:
2558 case Instruction::FDiv: Out << " / "; break;
2559 case Instruction::And: Out << " & "; break;
2560 case Instruction::Or: Out << " | "; break;
2561 case Instruction::Xor: Out << " ^ "; break;
2562 case Instruction::Shl : Out << " << "; break;
2563 case Instruction::LShr:
2564 case Instruction::AShr: Out << " >> "; break;
2567 errs() << "Invalid operator type!" << I;
2569 llvm_unreachable(0);
2572 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2573 if (NeedsClosingParens)
2582 void CWriter::visitICmpInst(ICmpInst &I) {
2583 // We must cast the results of icmp which might be promoted.
2584 bool needsCast = false;
2586 // Write out the cast of the instruction's value back to the proper type
2588 bool NeedsClosingParens = writeInstructionCast(I);
2590 // Certain icmp predicate require the operand to be forced to a specific type
2591 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2592 // below for operand 1
2593 writeOperandWithCast(I.getOperand(0), I);
2595 switch (I.getPredicate()) {
2596 case ICmpInst::ICMP_EQ: Out << " == "; break;
2597 case ICmpInst::ICMP_NE: Out << " != "; break;
2598 case ICmpInst::ICMP_ULE:
2599 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2600 case ICmpInst::ICMP_UGE:
2601 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2602 case ICmpInst::ICMP_ULT:
2603 case ICmpInst::ICMP_SLT: Out << " < "; break;
2604 case ICmpInst::ICMP_UGT:
2605 case ICmpInst::ICMP_SGT: Out << " > "; break;
2608 errs() << "Invalid icmp predicate!" << I;
2610 llvm_unreachable(0);
2613 writeOperandWithCast(I.getOperand(1), I);
2614 if (NeedsClosingParens)
2622 void CWriter::visitFCmpInst(FCmpInst &I) {
2623 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2627 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2633 switch (I.getPredicate()) {
2634 default: llvm_unreachable("Illegal FCmp predicate");
2635 case FCmpInst::FCMP_ORD: op = "ord"; break;
2636 case FCmpInst::FCMP_UNO: op = "uno"; break;
2637 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2638 case FCmpInst::FCMP_UNE: op = "une"; break;
2639 case FCmpInst::FCMP_ULT: op = "ult"; break;
2640 case FCmpInst::FCMP_ULE: op = "ule"; break;
2641 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2642 case FCmpInst::FCMP_UGE: op = "uge"; break;
2643 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2644 case FCmpInst::FCMP_ONE: op = "one"; break;
2645 case FCmpInst::FCMP_OLT: op = "olt"; break;
2646 case FCmpInst::FCMP_OLE: op = "ole"; break;
2647 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2648 case FCmpInst::FCMP_OGE: op = "oge"; break;
2651 Out << "llvm_fcmp_" << op << "(";
2652 // Write the first operand
2653 writeOperand(I.getOperand(0));
2655 // Write the second operand
2656 writeOperand(I.getOperand(1));
2660 static const char * getFloatBitCastField(Type *Ty) {
2661 switch (Ty->getTypeID()) {
2662 default: llvm_unreachable("Invalid Type");
2663 case Type::FloatTyID: return "Float";
2664 case Type::DoubleTyID: return "Double";
2665 case Type::IntegerTyID: {
2666 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2675 void CWriter::visitCastInst(CastInst &I) {
2676 Type *DstTy = I.getType();
2677 Type *SrcTy = I.getOperand(0)->getType();
2678 if (isFPIntBitCast(I)) {
2680 // These int<->float and long<->double casts need to be handled specially
2681 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2682 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2683 writeOperand(I.getOperand(0));
2684 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2685 << getFloatBitCastField(I.getType());
2691 printCast(I.getOpcode(), SrcTy, DstTy);
2693 // Make a sext from i1 work by subtracting the i1 from 0 (an int).
2694 if (SrcTy == Type::getInt1Ty(I.getContext()) &&
2695 I.getOpcode() == Instruction::SExt)
2698 writeOperand(I.getOperand(0));
2700 if (DstTy == Type::getInt1Ty(I.getContext()) &&
2701 (I.getOpcode() == Instruction::Trunc ||
2702 I.getOpcode() == Instruction::FPToUI ||
2703 I.getOpcode() == Instruction::FPToSI ||
2704 I.getOpcode() == Instruction::PtrToInt)) {
2705 // Make sure we really get a trunc to bool by anding the operand with 1
2711 void CWriter::visitSelectInst(SelectInst &I) {
2713 writeOperand(I.getCondition());
2715 writeOperand(I.getTrueValue());
2717 writeOperand(I.getFalseValue());
2721 // Returns the macro name or value of the max or min of an integer type
2722 // (as defined in limits.h).
2723 static void printLimitValue(IntegerType &Ty, bool isSigned, bool isMax,
2726 const char* sprefix = "";
2728 unsigned NumBits = Ty.getBitWidth();
2732 } else if (NumBits <= 16) {
2734 } else if (NumBits <= 32) {
2736 } else if (NumBits <= 64) {
2739 llvm_unreachable("Bit widths > 64 not implemented yet");
2743 Out << sprefix << type << (isMax ? "_MAX" : "_MIN");
2745 Out << "U" << type << (isMax ? "_MAX" : "0");
2749 static bool isSupportedIntegerSize(IntegerType &T) {
2750 return T.getBitWidth() == 8 || T.getBitWidth() == 16 ||
2751 T.getBitWidth() == 32 || T.getBitWidth() == 64;
2755 void CWriter::printIntrinsicDefinition(const Function &F, raw_ostream &Out) {
2756 FunctionType *funT = F.getFunctionType();
2757 Type *retT = F.getReturnType();
2758 IntegerType *elemT = cast<IntegerType>(funT->getParamType(1));
2760 assert(isSupportedIntegerSize(*elemT) &&
2761 "CBackend does not support arbitrary size integers.");
2762 assert(cast<StructType>(retT)->getElementType(0) == elemT &&
2763 elemT == funT->getParamType(0) && funT->getNumParams() == 2);
2765 switch (F.getIntrinsicID()) {
2767 llvm_unreachable("Unsupported Intrinsic.");
2768 case Intrinsic::uadd_with_overflow:
2769 // static inline Rty uadd_ixx(unsigned ixx a, unsigned ixx b) {
2771 // r.field0 = a + b;
2772 // r.field1 = (r.field0 < a);
2775 Out << "static inline ";
2776 printType(Out, retT);
2777 Out << GetValueName(&F);
2779 printSimpleType(Out, elemT, false);
2781 printSimpleType(Out, elemT, false);
2783 printType(Out, retT);
2785 Out << " r.field0 = a + b;\n";
2786 Out << " r.field1 = (r.field0 < a);\n";
2787 Out << " return r;\n}\n";
2790 case Intrinsic::sadd_with_overflow:
2791 // static inline Rty sadd_ixx(ixx a, ixx b) {
2793 // r.field1 = (b > 0 && a > XX_MAX - b) ||
2794 // (b < 0 && a < XX_MIN - b);
2795 // r.field0 = r.field1 ? 0 : a + b;
2799 printType(Out, retT);
2800 Out << GetValueName(&F);
2802 printSimpleType(Out, elemT, true);
2804 printSimpleType(Out, elemT, true);
2806 printType(Out, retT);
2808 Out << " r.field1 = (b > 0 && a > ";
2809 printLimitValue(*elemT, true, true, Out);
2810 Out << " - b) || (b < 0 && a < ";
2811 printLimitValue(*elemT, true, false, Out);
2813 Out << " r.field0 = r.field1 ? 0 : a + b;\n";
2814 Out << " return r;\n}\n";
2819 void CWriter::lowerIntrinsics(Function &F) {
2820 // This is used to keep track of intrinsics that get generated to a lowered
2821 // function. We must generate the prototypes before the function body which
2822 // will only be expanded on first use (by the loop below).
2823 std::vector<Function*> prototypesToGen;
2825 // Examine all the instructions in this function to find the intrinsics that
2826 // need to be lowered.
2827 for (Function::iterator BB = F.begin(), EE = F.end(); BB != EE; ++BB)
2828 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2829 if (CallInst *CI = dyn_cast<CallInst>(I++))
2830 if (Function *F = CI->getCalledFunction())
2831 switch (F->getIntrinsicID()) {
2832 case Intrinsic::not_intrinsic:
2833 case Intrinsic::memory_barrier:
2834 case Intrinsic::vastart:
2835 case Intrinsic::vacopy:
2836 case Intrinsic::vaend:
2837 case Intrinsic::returnaddress:
2838 case Intrinsic::frameaddress:
2839 case Intrinsic::setjmp:
2840 case Intrinsic::longjmp:
2841 case Intrinsic::prefetch:
2842 case Intrinsic::powi:
2843 case Intrinsic::x86_sse_cmp_ss:
2844 case Intrinsic::x86_sse_cmp_ps:
2845 case Intrinsic::x86_sse2_cmp_sd:
2846 case Intrinsic::x86_sse2_cmp_pd:
2847 case Intrinsic::ppc_altivec_lvsl:
2848 case Intrinsic::uadd_with_overflow:
2849 case Intrinsic::sadd_with_overflow:
2850 // We directly implement these intrinsics
2853 // If this is an intrinsic that directly corresponds to a GCC
2854 // builtin, we handle it.
2855 const char *BuiltinName = "";
2856 #define GET_GCC_BUILTIN_NAME
2857 #include "llvm/Intrinsics.gen"
2858 #undef GET_GCC_BUILTIN_NAME
2859 // If we handle it, don't lower it.
2860 if (BuiltinName[0]) break;
2862 // All other intrinsic calls we must lower.
2863 Instruction *Before = 0;
2864 if (CI != &BB->front())
2865 Before = prior(BasicBlock::iterator(CI));
2867 IL->LowerIntrinsicCall(CI);
2868 if (Before) { // Move iterator to instruction after call
2873 // If the intrinsic got lowered to another call, and that call has
2874 // a definition then we need to make sure its prototype is emitted
2875 // before any calls to it.
2876 if (CallInst *Call = dyn_cast<CallInst>(I))
2877 if (Function *NewF = Call->getCalledFunction())
2878 if (!NewF->isDeclaration())
2879 prototypesToGen.push_back(NewF);
2884 // We may have collected some prototypes to emit in the loop above.
2885 // Emit them now, before the function that uses them is emitted. But,
2886 // be careful not to emit them twice.
2887 std::vector<Function*>::iterator I = prototypesToGen.begin();
2888 std::vector<Function*>::iterator E = prototypesToGen.end();
2889 for ( ; I != E; ++I) {
2890 if (intrinsicPrototypesAlreadyGenerated.insert(*I).second) {
2892 printFunctionSignature(*I, true);
2898 void CWriter::visitCallInst(CallInst &I) {
2899 if (isa<InlineAsm>(I.getCalledValue()))
2900 return visitInlineAsm(I);
2902 bool WroteCallee = false;
2904 // Handle intrinsic function calls first...
2905 if (Function *F = I.getCalledFunction())
2906 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
2907 if (visitBuiltinCall(I, ID, WroteCallee))
2910 Value *Callee = I.getCalledValue();
2912 PointerType *PTy = cast<PointerType>(Callee->getType());
2913 FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2915 // If this is a call to a struct-return function, assign to the first
2916 // parameter instead of passing it to the call.
2917 const AttrListPtr &PAL = I.getAttributes();
2918 bool hasByVal = I.hasByValArgument();
2919 bool isStructRet = I.hasStructRetAttr();
2921 writeOperandDeref(I.getArgOperand(0));
2925 if (I.isTailCall()) Out << " /*tail*/ ";
2928 // If this is an indirect call to a struct return function, we need to cast
2929 // the pointer. Ditto for indirect calls with byval arguments.
2930 bool NeedsCast = (hasByVal || isStructRet) && !isa<Function>(Callee);
2932 // GCC is a real PITA. It does not permit codegening casts of functions to
2933 // function pointers if they are in a call (it generates a trap instruction
2934 // instead!). We work around this by inserting a cast to void* in between
2935 // the function and the function pointer cast. Unfortunately, we can't just
2936 // form the constant expression here, because the folder will immediately
2939 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2940 // that void* and function pointers have the same size. :( To deal with this
2941 // in the common case, we handle casts where the number of arguments passed
2944 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2946 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2952 // Ok, just cast the pointer type.
2955 printStructReturnPointerFunctionType(Out, PAL,
2956 cast<PointerType>(I.getCalledValue()->getType()));
2958 printType(Out, I.getCalledValue()->getType(), false, "", true, PAL);
2960 printType(Out, I.getCalledValue()->getType());
2963 writeOperand(Callee);
2964 if (NeedsCast) Out << ')';
2969 bool PrintedArg = false;
2970 if(FTy->isVarArg() && !FTy->getNumParams()) {
2971 Out << "0 /*dummy arg*/";
2975 unsigned NumDeclaredParams = FTy->getNumParams();
2977 CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
2979 if (isStructRet) { // Skip struct return argument.
2985 for (; AI != AE; ++AI, ++ArgNo) {
2986 if (PrintedArg) Out << ", ";
2987 if (ArgNo < NumDeclaredParams &&
2988 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2990 printType(Out, FTy->getParamType(ArgNo),
2991 /*isSigned=*/PAL.paramHasAttr(ArgNo+1, Attribute::SExt));
2994 // Check if the argument is expected to be passed by value.
2995 if (I.paramHasAttr(ArgNo+1, Attribute::ByVal))
2996 writeOperandDeref(*AI);
3004 /// visitBuiltinCall - Handle the call to the specified builtin. Returns true
3005 /// if the entire call is handled, return false if it wasn't handled, and
3006 /// optionally set 'WroteCallee' if the callee has already been printed out.
3007 bool CWriter::visitBuiltinCall(CallInst &I, Intrinsic::ID ID,
3008 bool &WroteCallee) {
3011 // If this is an intrinsic that directly corresponds to a GCC
3012 // builtin, we emit it here.
3013 const char *BuiltinName = "";
3014 Function *F = I.getCalledFunction();
3015 #define GET_GCC_BUILTIN_NAME
3016 #include "llvm/Intrinsics.gen"
3017 #undef GET_GCC_BUILTIN_NAME
3018 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
3024 case Intrinsic::memory_barrier:
3025 Out << "__sync_synchronize()";
3027 case Intrinsic::vastart:
3030 Out << "va_start(*(va_list*)";
3031 writeOperand(I.getArgOperand(0));
3033 // Output the last argument to the enclosing function.
3034 if (I.getParent()->getParent()->arg_empty())
3035 Out << "vararg_dummy_arg";
3037 writeOperand(--I.getParent()->getParent()->arg_end());
3040 case Intrinsic::vaend:
3041 if (!isa<ConstantPointerNull>(I.getArgOperand(0))) {
3042 Out << "0; va_end(*(va_list*)";
3043 writeOperand(I.getArgOperand(0));
3046 Out << "va_end(*(va_list*)0)";
3049 case Intrinsic::vacopy:
3051 Out << "va_copy(*(va_list*)";
3052 writeOperand(I.getArgOperand(0));
3053 Out << ", *(va_list*)";
3054 writeOperand(I.getArgOperand(1));
3057 case Intrinsic::returnaddress:
3058 Out << "__builtin_return_address(";
3059 writeOperand(I.getArgOperand(0));
3062 case Intrinsic::frameaddress:
3063 Out << "__builtin_frame_address(";
3064 writeOperand(I.getArgOperand(0));
3067 case Intrinsic::powi:
3068 Out << "__builtin_powi(";
3069 writeOperand(I.getArgOperand(0));
3071 writeOperand(I.getArgOperand(1));
3074 case Intrinsic::setjmp:
3075 Out << "setjmp(*(jmp_buf*)";
3076 writeOperand(I.getArgOperand(0));
3079 case Intrinsic::longjmp:
3080 Out << "longjmp(*(jmp_buf*)";
3081 writeOperand(I.getArgOperand(0));
3083 writeOperand(I.getArgOperand(1));
3086 case Intrinsic::prefetch:
3087 Out << "LLVM_PREFETCH((const void *)";
3088 writeOperand(I.getArgOperand(0));
3090 writeOperand(I.getArgOperand(1));
3092 writeOperand(I.getArgOperand(2));
3095 case Intrinsic::stacksave:
3096 // Emit this as: Val = 0; *((void**)&Val) = __builtin_stack_save()
3097 // to work around GCC bugs (see PR1809).
3098 Out << "0; *((void**)&" << GetValueName(&I)
3099 << ") = __builtin_stack_save()";
3101 case Intrinsic::x86_sse_cmp_ss:
3102 case Intrinsic::x86_sse_cmp_ps:
3103 case Intrinsic::x86_sse2_cmp_sd:
3104 case Intrinsic::x86_sse2_cmp_pd:
3106 printType(Out, I.getType());
3108 // Multiple GCC builtins multiplex onto this intrinsic.
3109 switch (cast<ConstantInt>(I.getArgOperand(2))->getZExtValue()) {
3110 default: llvm_unreachable("Invalid llvm.x86.sse.cmp!");
3111 case 0: Out << "__builtin_ia32_cmpeq"; break;
3112 case 1: Out << "__builtin_ia32_cmplt"; break;
3113 case 2: Out << "__builtin_ia32_cmple"; break;
3114 case 3: Out << "__builtin_ia32_cmpunord"; break;
3115 case 4: Out << "__builtin_ia32_cmpneq"; break;
3116 case 5: Out << "__builtin_ia32_cmpnlt"; break;
3117 case 6: Out << "__builtin_ia32_cmpnle"; break;
3118 case 7: Out << "__builtin_ia32_cmpord"; break;
3120 if (ID == Intrinsic::x86_sse_cmp_ps || ID == Intrinsic::x86_sse2_cmp_pd)
3124 if (ID == Intrinsic::x86_sse_cmp_ss || ID == Intrinsic::x86_sse_cmp_ps)
3130 writeOperand(I.getArgOperand(0));
3132 writeOperand(I.getArgOperand(1));
3135 case Intrinsic::ppc_altivec_lvsl:
3137 printType(Out, I.getType());
3139 Out << "__builtin_altivec_lvsl(0, (void*)";
3140 writeOperand(I.getArgOperand(0));
3143 case Intrinsic::uadd_with_overflow:
3144 case Intrinsic::sadd_with_overflow:
3145 Out << GetValueName(I.getCalledFunction()) << "(";
3146 writeOperand(I.getArgOperand(0));
3148 writeOperand(I.getArgOperand(1));
3154 //This converts the llvm constraint string to something gcc is expecting.
3155 //TODO: work out platform independent constraints and factor those out
3156 // of the per target tables
3157 // handle multiple constraint codes
3158 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
3159 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
3161 // Grab the translation table from MCAsmInfo if it exists.
3162 const MCAsmInfo *TargetAsm;
3163 std::string Triple = TheModule->getTargetTriple();
3165 Triple = llvm::sys::getHostTriple();
3168 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
3169 TargetAsm = Match->createMCAsmInfo(Triple);
3173 const char *const *table = TargetAsm->getAsmCBE();
3175 // Search the translation table if it exists.
3176 for (int i = 0; table && table[i]; i += 2)
3177 if (c.Codes[0] == table[i]) {
3182 // Default is identity.
3187 //TODO: import logic from AsmPrinter.cpp
3188 static std::string gccifyAsm(std::string asmstr) {
3189 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
3190 if (asmstr[i] == '\n')
3191 asmstr.replace(i, 1, "\\n");
3192 else if (asmstr[i] == '\t')
3193 asmstr.replace(i, 1, "\\t");
3194 else if (asmstr[i] == '$') {
3195 if (asmstr[i + 1] == '{') {
3196 std::string::size_type a = asmstr.find_first_of(':', i + 1);
3197 std::string::size_type b = asmstr.find_first_of('}', i + 1);
3198 std::string n = "%" +
3199 asmstr.substr(a + 1, b - a - 1) +
3200 asmstr.substr(i + 2, a - i - 2);
3201 asmstr.replace(i, b - i + 1, n);
3204 asmstr.replace(i, 1, "%");
3206 else if (asmstr[i] == '%')//grr
3207 { asmstr.replace(i, 1, "%%"); ++i;}
3212 //TODO: assumptions about what consume arguments from the call are likely wrong
3213 // handle communitivity
3214 void CWriter::visitInlineAsm(CallInst &CI) {
3215 InlineAsm* as = cast<InlineAsm>(CI.getCalledValue());
3216 InlineAsm::ConstraintInfoVector Constraints = as->ParseConstraints();
3218 std::vector<std::pair<Value*, int> > ResultVals;
3219 if (CI.getType() == Type::getVoidTy(CI.getContext()))
3221 else if (StructType *ST = dyn_cast<StructType>(CI.getType())) {
3222 for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i)
3223 ResultVals.push_back(std::make_pair(&CI, (int)i));
3225 ResultVals.push_back(std::make_pair(&CI, -1));
3228 // Fix up the asm string for gcc and emit it.
3229 Out << "__asm__ volatile (\"" << gccifyAsm(as->getAsmString()) << "\"\n";
3232 unsigned ValueCount = 0;
3233 bool IsFirst = true;
3235 // Convert over all the output constraints.
3236 for (InlineAsm::ConstraintInfoVector::iterator I = Constraints.begin(),
3237 E = Constraints.end(); I != E; ++I) {
3239 if (I->Type != InlineAsm::isOutput) {
3241 continue; // Ignore non-output constraints.
3244 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3245 std::string C = InterpretASMConstraint(*I);
3246 if (C.empty()) continue;
3257 if (ValueCount < ResultVals.size()) {
3258 DestVal = ResultVals[ValueCount].first;
3259 DestValNo = ResultVals[ValueCount].second;
3261 DestVal = CI.getArgOperand(ValueCount-ResultVals.size());
3263 if (I->isEarlyClobber)
3266 Out << "\"=" << C << "\"(" << GetValueName(DestVal);
3267 if (DestValNo != -1)
3268 Out << ".field" << DestValNo; // Multiple retvals.
3274 // Convert over all the input constraints.
3278 for (InlineAsm::ConstraintInfoVector::iterator I = Constraints.begin(),
3279 E = Constraints.end(); I != E; ++I) {
3280 if (I->Type != InlineAsm::isInput) {
3282 continue; // Ignore non-input constraints.
3285 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3286 std::string C = InterpretASMConstraint(*I);
3287 if (C.empty()) continue;
3294 assert(ValueCount >= ResultVals.size() && "Input can't refer to result");
3295 Value *SrcVal = CI.getArgOperand(ValueCount-ResultVals.size());
3297 Out << "\"" << C << "\"(";
3299 writeOperand(SrcVal);
3301 writeOperandDeref(SrcVal);
3305 // Convert over the clobber constraints.
3307 for (InlineAsm::ConstraintInfoVector::iterator I = Constraints.begin(),
3308 E = Constraints.end(); I != E; ++I) {
3309 if (I->Type != InlineAsm::isClobber)
3310 continue; // Ignore non-input constraints.
3312 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3313 std::string C = InterpretASMConstraint(*I);
3314 if (C.empty()) continue;
3321 Out << '\"' << C << '"';
3327 void CWriter::visitAllocaInst(AllocaInst &I) {
3329 printType(Out, I.getType());
3330 Out << ") alloca(sizeof(";
3331 printType(Out, I.getType()->getElementType());
3333 if (I.isArrayAllocation()) {
3335 writeOperand(I.getOperand(0));
3340 void CWriter::printGEPExpression(Value *Ptr, gep_type_iterator I,
3341 gep_type_iterator E, bool Static) {
3343 // If there are no indices, just print out the pointer.
3349 // Find out if the last index is into a vector. If so, we have to print this
3350 // specially. Since vectors can't have elements of indexable type, only the
3351 // last index could possibly be of a vector element.
3352 VectorType *LastIndexIsVector = 0;
3354 for (gep_type_iterator TmpI = I; TmpI != E; ++TmpI)
3355 LastIndexIsVector = dyn_cast<VectorType>(*TmpI);
3360 // If the last index is into a vector, we can't print it as &a[i][j] because
3361 // we can't index into a vector with j in GCC. Instead, emit this as
3362 // (((float*)&a[i])+j)
3363 if (LastIndexIsVector) {
3365 printType(Out, PointerType::getUnqual(LastIndexIsVector->getElementType()));
3371 // If the first index is 0 (very typical) we can do a number of
3372 // simplifications to clean up the code.
3373 Value *FirstOp = I.getOperand();
3374 if (!isa<Constant>(FirstOp) || !cast<Constant>(FirstOp)->isNullValue()) {
3375 // First index isn't simple, print it the hard way.
3378 ++I; // Skip the zero index.
3380 // Okay, emit the first operand. If Ptr is something that is already address
3381 // exposed, like a global, avoid emitting (&foo)[0], just emit foo instead.
3382 if (isAddressExposed(Ptr)) {
3383 writeOperandInternal(Ptr, Static);
3384 } else if (I != E && (*I)->isStructTy()) {
3385 // If we didn't already emit the first operand, see if we can print it as
3386 // P->f instead of "P[0].f"
3388 Out << "->field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3389 ++I; // eat the struct index as well.
3391 // Instead of emitting P[0][1], emit (*P)[1], which is more idiomatic.
3398 for (; I != E; ++I) {
3399 if ((*I)->isStructTy()) {
3400 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3401 } else if ((*I)->isArrayTy()) {
3403 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3405 } else if (!(*I)->isVectorTy()) {
3407 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3410 // If the last index is into a vector, then print it out as "+j)". This
3411 // works with the 'LastIndexIsVector' code above.
3412 if (isa<Constant>(I.getOperand()) &&
3413 cast<Constant>(I.getOperand())->isNullValue()) {
3414 Out << "))"; // avoid "+0".
3417 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3425 void CWriter::writeMemoryAccess(Value *Operand, Type *OperandType,
3426 bool IsVolatile, unsigned Alignment) {
3428 bool IsUnaligned = Alignment &&
3429 Alignment < TD->getABITypeAlignment(OperandType);
3433 if (IsVolatile || IsUnaligned) {
3436 Out << "struct __attribute__ ((packed, aligned(" << Alignment << "))) {";
3437 printType(Out, OperandType, false, IsUnaligned ? "data" : "volatile*");
3440 if (IsVolatile) Out << "volatile ";
3446 writeOperand(Operand);
3448 if (IsVolatile || IsUnaligned) {
3455 void CWriter::visitLoadInst(LoadInst &I) {
3456 writeMemoryAccess(I.getOperand(0), I.getType(), I.isVolatile(),
3461 void CWriter::visitStoreInst(StoreInst &I) {
3462 writeMemoryAccess(I.getPointerOperand(), I.getOperand(0)->getType(),
3463 I.isVolatile(), I.getAlignment());
3465 Value *Operand = I.getOperand(0);
3466 Constant *BitMask = 0;
3467 if (IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
3468 if (!ITy->isPowerOf2ByteWidth())
3469 // We have a bit width that doesn't match an even power-of-2 byte
3470 // size. Consequently we must & the value with the type's bit mask
3471 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
3474 writeOperand(Operand);
3477 printConstant(BitMask, false);
3482 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
3483 printGEPExpression(I.getPointerOperand(), gep_type_begin(I),
3484 gep_type_end(I), false);
3487 void CWriter::visitVAArgInst(VAArgInst &I) {
3488 Out << "va_arg(*(va_list*)";
3489 writeOperand(I.getOperand(0));
3491 printType(Out, I.getType());
3495 void CWriter::visitInsertElementInst(InsertElementInst &I) {
3496 Type *EltTy = I.getType()->getElementType();
3497 writeOperand(I.getOperand(0));
3500 printType(Out, PointerType::getUnqual(EltTy));
3501 Out << ")(&" << GetValueName(&I) << "))[";
3502 writeOperand(I.getOperand(2));
3504 writeOperand(I.getOperand(1));
3508 void CWriter::visitExtractElementInst(ExtractElementInst &I) {
3509 // We know that our operand is not inlined.
3512 cast<VectorType>(I.getOperand(0)->getType())->getElementType();
3513 printType(Out, PointerType::getUnqual(EltTy));
3514 Out << ")(&" << GetValueName(I.getOperand(0)) << "))[";
3515 writeOperand(I.getOperand(1));
3519 void CWriter::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
3521 printType(Out, SVI.getType());
3523 VectorType *VT = SVI.getType();
3524 unsigned NumElts = VT->getNumElements();
3525 Type *EltTy = VT->getElementType();
3527 for (unsigned i = 0; i != NumElts; ++i) {
3529 int SrcVal = SVI.getMaskValue(i);
3530 if ((unsigned)SrcVal >= NumElts*2) {
3531 Out << " 0/*undef*/ ";
3533 Value *Op = SVI.getOperand((unsigned)SrcVal >= NumElts);
3534 if (isa<Instruction>(Op)) {
3535 // Do an extractelement of this value from the appropriate input.
3537 printType(Out, PointerType::getUnqual(EltTy));
3538 Out << ")(&" << GetValueName(Op)
3539 << "))[" << (SrcVal & (NumElts-1)) << "]";
3540 } else if (isa<ConstantAggregateZero>(Op) || isa<UndefValue>(Op)) {
3543 printConstant(cast<ConstantVector>(Op)->getOperand(SrcVal &
3552 void CWriter::visitInsertValueInst(InsertValueInst &IVI) {
3553 // Start by copying the entire aggregate value into the result variable.
3554 writeOperand(IVI.getOperand(0));
3557 // Then do the insert to update the field.
3558 Out << GetValueName(&IVI);
3559 for (const unsigned *b = IVI.idx_begin(), *i = b, *e = IVI.idx_end();
3562 ExtractValueInst::getIndexedType(IVI.getOperand(0)->getType(),
3563 makeArrayRef(b, i+1));
3564 if (IndexedTy->isArrayTy())
3565 Out << ".array[" << *i << "]";
3567 Out << ".field" << *i;
3570 writeOperand(IVI.getOperand(1));
3573 void CWriter::visitExtractValueInst(ExtractValueInst &EVI) {
3575 if (isa<UndefValue>(EVI.getOperand(0))) {
3577 printType(Out, EVI.getType());
3578 Out << ") 0/*UNDEF*/";
3580 Out << GetValueName(EVI.getOperand(0));
3581 for (const unsigned *b = EVI.idx_begin(), *i = b, *e = EVI.idx_end();
3584 ExtractValueInst::getIndexedType(EVI.getOperand(0)->getType(),
3585 makeArrayRef(b, i+1));
3586 if (IndexedTy->isArrayTy())
3587 Out << ".array[" << *i << "]";
3589 Out << ".field" << *i;
3595 //===----------------------------------------------------------------------===//
3596 // External Interface declaration
3597 //===----------------------------------------------------------------------===//
3599 bool CTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
3600 formatted_raw_ostream &o,
3601 CodeGenFileType FileType,
3602 CodeGenOpt::Level OptLevel,
3603 bool DisableVerify) {
3604 if (FileType != TargetMachine::CGFT_AssemblyFile) return true;
3606 PM.add(createGCLoweringPass());
3607 PM.add(createLowerInvokePass());
3608 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
3609 PM.add(new CWriter(o));
3610 PM.add(createGCInfoDeleter());