1 //===-- CBackend.cpp - Library for converting LLVM code to C --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This library converts LLVM code to C code, compilable by GCC and other C
13 //===----------------------------------------------------------------------===//
15 #include "CTargetMachine.h"
16 #include "llvm/CallingConv.h"
17 #include "llvm/Constants.h"
18 #include "llvm/DerivedTypes.h"
19 #include "llvm/Module.h"
20 #include "llvm/Instructions.h"
21 #include "llvm/Pass.h"
22 #include "llvm/PassManager.h"
23 #include "llvm/TypeSymbolTable.h"
24 #include "llvm/Intrinsics.h"
25 #include "llvm/IntrinsicInst.h"
26 #include "llvm/InlineAsm.h"
27 #include "llvm/ADT/StringExtras.h"
28 #include "llvm/ADT/SmallString.h"
29 #include "llvm/ADT/STLExtras.h"
30 #include "llvm/Analysis/ConstantsScanner.h"
31 #include "llvm/Analysis/FindUsedTypes.h"
32 #include "llvm/Analysis/LoopInfo.h"
33 #include "llvm/Analysis/ValueTracking.h"
34 #include "llvm/CodeGen/Passes.h"
35 #include "llvm/CodeGen/IntrinsicLowering.h"
36 #include "llvm/Target/Mangler.h"
37 #include "llvm/Transforms/Scalar.h"
38 #include "llvm/MC/MCAsmInfo.h"
39 #include "llvm/MC/MCContext.h"
40 #include "llvm/MC/MCSymbol.h"
41 #include "llvm/Target/TargetData.h"
42 #include "llvm/Target/TargetRegistry.h"
43 #include "llvm/Support/CallSite.h"
44 #include "llvm/Support/CFG.h"
45 #include "llvm/Support/ErrorHandling.h"
46 #include "llvm/Support/FormattedStream.h"
47 #include "llvm/Support/GetElementPtrTypeIterator.h"
48 #include "llvm/Support/InstVisitor.h"
49 #include "llvm/Support/MathExtras.h"
50 #include "llvm/System/Host.h"
51 #include "llvm/Config/config.h"
55 extern "C" void LLVMInitializeCBackendTarget() {
56 // Register the target.
57 RegisterTargetMachine<CTargetMachine> X(TheCBackendTarget);
61 class CBEMCAsmInfo : public MCAsmInfo {
65 PrivateGlobalPrefix = "";
68 /// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
69 /// any unnamed structure types that are used by the program, and merges
70 /// external functions with the same name.
72 class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
75 CBackendNameAllUsedStructsAndMergeFunctions()
77 void getAnalysisUsage(AnalysisUsage &AU) const {
78 AU.addRequired<FindUsedTypes>();
81 virtual const char *getPassName() const {
82 return "C backend type canonicalizer";
85 virtual bool runOnModule(Module &M);
88 char CBackendNameAllUsedStructsAndMergeFunctions::ID = 0;
90 /// CWriter - This class is the main chunk of code that converts an LLVM
91 /// module to a C translation unit.
92 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
93 formatted_raw_ostream &Out;
94 IntrinsicLowering *IL;
97 const Module *TheModule;
98 const MCAsmInfo* TAsm;
100 const TargetData* TD;
101 std::map<const Type *, std::string> TypeNames;
102 std::map<const ConstantFP *, unsigned> FPConstantMap;
103 std::set<Function*> intrinsicPrototypesAlreadyGenerated;
104 std::set<const Argument*> ByValParams;
106 unsigned OpaqueCounter;
107 DenseMap<const Value*, unsigned> AnonValueNumbers;
108 unsigned NextAnonValueNumber;
112 explicit CWriter(formatted_raw_ostream &o)
113 : FunctionPass(&ID), Out(o), IL(0), Mang(0), LI(0),
114 TheModule(0), TAsm(0), TD(0), OpaqueCounter(0), NextAnonValueNumber(0) {
118 virtual const char *getPassName() const { return "C backend"; }
120 void getAnalysisUsage(AnalysisUsage &AU) const {
121 AU.addRequired<LoopInfo>();
122 AU.setPreservesAll();
125 virtual bool doInitialization(Module &M);
127 bool runOnFunction(Function &F) {
128 // Do not codegen any 'available_externally' functions at all, they have
129 // definitions outside the translation unit.
130 if (F.hasAvailableExternallyLinkage())
133 LI = &getAnalysis<LoopInfo>();
135 // Get rid of intrinsics we can't handle.
138 // Output all floating point constants that cannot be printed accurately.
139 printFloatingPointConstants(F);
145 virtual bool doFinalization(Module &M) {
150 FPConstantMap.clear();
153 intrinsicPrototypesAlreadyGenerated.clear();
157 raw_ostream &printType(raw_ostream &Out, const Type *Ty,
158 bool isSigned = false,
159 const std::string &VariableName = "",
160 bool IgnoreName = false,
161 const AttrListPtr &PAL = AttrListPtr());
162 raw_ostream &printSimpleType(raw_ostream &Out, const Type *Ty,
164 const std::string &NameSoFar = "");
166 void printStructReturnPointerFunctionType(raw_ostream &Out,
167 const AttrListPtr &PAL,
168 const PointerType *Ty);
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, const Type *OperandType,
192 bool IsVolatile, unsigned Alignment);
195 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
197 void lowerIntrinsics(Function &F);
199 void printModule(Module *M);
200 void printModuleTypes(const TypeSymbolTable &ST);
201 void printContainedStructs(const Type *Ty, std::set<const Type *> &);
202 void printFloatingPointConstants(Function &F);
203 void printFloatingPointConstants(const Constant *C);
204 void printFunctionSignature(const Function *F, bool Prototype);
206 void printFunction(Function &);
207 void printBasicBlock(BasicBlock *BB);
208 void printLoop(Loop *L);
210 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
211 void printConstant(Constant *CPV, bool Static);
212 void printConstantWithCast(Constant *CPV, unsigned Opcode);
213 bool printConstExprCast(const ConstantExpr *CE, bool Static);
214 void printConstantArray(ConstantArray *CPA, bool Static);
215 void printConstantVector(ConstantVector *CV, bool Static);
217 /// isAddressExposed - Return true if the specified value's name needs to
218 /// have its address taken in order to get a C value of the correct type.
219 /// This happens for global variables, byval parameters, and direct allocas.
220 bool isAddressExposed(const Value *V) const {
221 if (const Argument *A = dyn_cast<Argument>(V))
222 return ByValParams.count(A);
223 return isa<GlobalVariable>(V) || isDirectAlloca(V);
226 // isInlinableInst - Attempt to inline instructions into their uses to build
227 // trees as much as possible. To do this, we have to consistently decide
228 // what is acceptable to inline, so that variable declarations don't get
229 // printed and an extra copy of the expr is not emitted.
231 static bool isInlinableInst(const Instruction &I) {
232 // Always inline cmp instructions, even if they are shared by multiple
233 // expressions. GCC generates horrible code if we don't.
237 // Must be an expression, must be used exactly once. If it is dead, we
238 // emit it inline where it would go.
239 if (I.getType() == Type::getVoidTy(I.getContext()) || !I.hasOneUse() ||
240 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
241 isa<LoadInst>(I) || isa<VAArgInst>(I) || isa<InsertElementInst>(I) ||
242 isa<InsertValueInst>(I))
243 // Don't inline a load across a store or other bad things!
246 // Must not be used in inline asm, extractelement, or shufflevector.
248 const Instruction &User = cast<Instruction>(*I.use_back());
249 if (isInlineAsm(User) || isa<ExtractElementInst>(User) ||
250 isa<ShuffleVectorInst>(User))
254 // Only inline instruction it if it's use is in the same BB as the inst.
255 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
258 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
259 // variables which are accessed with the & operator. This causes GCC to
260 // generate significantly better code than to emit alloca calls directly.
262 static const AllocaInst *isDirectAlloca(const Value *V) {
263 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
264 if (!AI) return false;
265 if (AI->isArrayAllocation())
266 return 0; // FIXME: we can also inline fixed size array allocas!
267 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
272 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
273 static bool isInlineAsm(const Instruction& I) {
274 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
279 // Instruction visitation functions
280 friend class InstVisitor<CWriter>;
282 void visitReturnInst(ReturnInst &I);
283 void visitBranchInst(BranchInst &I);
284 void visitSwitchInst(SwitchInst &I);
285 void visitIndirectBrInst(IndirectBrInst &I);
286 void visitInvokeInst(InvokeInst &I) {
287 llvm_unreachable("Lowerinvoke pass didn't work!");
290 void visitUnwindInst(UnwindInst &I) {
291 llvm_unreachable("Lowerinvoke pass didn't work!");
293 void visitUnreachableInst(UnreachableInst &I);
295 void visitPHINode(PHINode &I);
296 void visitBinaryOperator(Instruction &I);
297 void visitICmpInst(ICmpInst &I);
298 void visitFCmpInst(FCmpInst &I);
300 void visitCastInst (CastInst &I);
301 void visitSelectInst(SelectInst &I);
302 void visitCallInst (CallInst &I);
303 void visitInlineAsm(CallInst &I);
304 bool visitBuiltinCall(CallInst &I, Intrinsic::ID ID, bool &WroteCallee);
306 void visitAllocaInst(AllocaInst &I);
307 void visitLoadInst (LoadInst &I);
308 void visitStoreInst (StoreInst &I);
309 void visitGetElementPtrInst(GetElementPtrInst &I);
310 void visitVAArgInst (VAArgInst &I);
312 void visitInsertElementInst(InsertElementInst &I);
313 void visitExtractElementInst(ExtractElementInst &I);
314 void visitShuffleVectorInst(ShuffleVectorInst &SVI);
316 void visitInsertValueInst(InsertValueInst &I);
317 void visitExtractValueInst(ExtractValueInst &I);
319 void visitInstruction(Instruction &I) {
321 errs() << "C Writer does not know about " << I;
326 void outputLValue(Instruction *I) {
327 Out << " " << GetValueName(I) << " = ";
330 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
331 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
332 BasicBlock *Successor, unsigned Indent);
333 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
335 void printGEPExpression(Value *Ptr, gep_type_iterator I,
336 gep_type_iterator E, bool Static);
338 std::string GetValueName(const Value *Operand);
342 char CWriter::ID = 0;
345 static std::string CBEMangle(const std::string &S) {
348 for (unsigned i = 0, e = S.size(); i != e; ++i)
349 if (isalnum(S[i]) || S[i] == '_') {
353 Result += 'A'+(S[i]&15);
354 Result += 'A'+((S[i]>>4)&15);
361 /// This method inserts names for any unnamed structure types that are used by
362 /// the program, and removes names from structure types that are not used by the
365 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
366 // Get a set of types that are used by the program...
367 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
369 // Loop over the module symbol table, removing types from UT that are
370 // already named, and removing names for types that are not used.
372 TypeSymbolTable &TST = M.getTypeSymbolTable();
373 for (TypeSymbolTable::iterator TI = TST.begin(), TE = TST.end();
375 TypeSymbolTable::iterator I = TI++;
377 // If this isn't a struct or array type, remove it from our set of types
378 // to name. This simplifies emission later.
379 if (!I->second->isStructTy() && !I->second->isOpaqueTy() &&
380 !I->second->isArrayTy()) {
383 // If this is not used, remove it from the symbol table.
384 std::set<const Type *>::iterator UTI = UT.find(I->second);
388 UT.erase(UTI); // Only keep one name for this type.
392 // UT now contains types that are not named. Loop over it, naming
395 bool Changed = false;
396 unsigned RenameCounter = 0;
397 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
399 if ((*I)->isStructTy() || (*I)->isArrayTy()) {
400 while (M.addTypeName("unnamed"+utostr(RenameCounter), *I))
406 // Loop over all external functions and globals. If we have two with
407 // identical names, merge them.
408 // FIXME: This code should disappear when we don't allow values with the same
409 // names when they have different types!
410 std::map<std::string, GlobalValue*> ExtSymbols;
411 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
413 if (GV->isDeclaration() && GV->hasName()) {
414 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
415 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
417 // Found a conflict, replace this global with the previous one.
418 GlobalValue *OldGV = X.first->second;
419 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
420 GV->eraseFromParent();
425 // Do the same for globals.
426 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
428 GlobalVariable *GV = I++;
429 if (GV->isDeclaration() && GV->hasName()) {
430 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
431 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
433 // Found a conflict, replace this global with the previous one.
434 GlobalValue *OldGV = X.first->second;
435 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
436 GV->eraseFromParent();
445 /// printStructReturnPointerFunctionType - This is like printType for a struct
446 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
447 /// print it as "Struct (*)(...)", for struct return functions.
448 void CWriter::printStructReturnPointerFunctionType(raw_ostream &Out,
449 const AttrListPtr &PAL,
450 const PointerType *TheTy) {
451 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
453 raw_string_ostream FunctionInnards(tstr);
454 FunctionInnards << " (*) (";
455 bool PrintedType = false;
457 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
458 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
460 for (++I, ++Idx; I != E; ++I, ++Idx) {
462 FunctionInnards << ", ";
463 const Type *ArgTy = *I;
464 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
465 assert(ArgTy->isPointerTy());
466 ArgTy = cast<PointerType>(ArgTy)->getElementType();
468 printType(FunctionInnards, ArgTy,
469 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
472 if (FTy->isVarArg()) {
474 FunctionInnards << ", ...";
475 } else if (!PrintedType) {
476 FunctionInnards << "void";
478 FunctionInnards << ')';
479 printType(Out, RetTy,
480 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
484 CWriter::printSimpleType(raw_ostream &Out, const Type *Ty, bool isSigned,
485 const std::string &NameSoFar) {
486 assert((Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) &&
487 "Invalid type for printSimpleType");
488 switch (Ty->getTypeID()) {
489 case Type::VoidTyID: return Out << "void " << NameSoFar;
490 case Type::IntegerTyID: {
491 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
493 return Out << "bool " << NameSoFar;
494 else if (NumBits <= 8)
495 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
496 else if (NumBits <= 16)
497 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
498 else if (NumBits <= 32)
499 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
500 else if (NumBits <= 64)
501 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
503 assert(NumBits <= 128 && "Bit widths > 128 not implemented yet");
504 return Out << (isSigned?"llvmInt128":"llvmUInt128") << " " << NameSoFar;
507 case Type::FloatTyID: return Out << "float " << NameSoFar;
508 case Type::DoubleTyID: return Out << "double " << NameSoFar;
509 // Lacking emulation of FP80 on PPC, etc., we assume whichever of these is
510 // present matches host 'long double'.
511 case Type::X86_FP80TyID:
512 case Type::PPC_FP128TyID:
513 case Type::FP128TyID: return Out << "long double " << NameSoFar;
515 case Type::VectorTyID: {
516 const VectorType *VTy = cast<VectorType>(Ty);
517 return printSimpleType(Out, VTy->getElementType(), isSigned,
518 " __attribute__((vector_size(" +
519 utostr(TD->getTypeAllocSize(VTy)) + " ))) " + NameSoFar);
524 errs() << "Unknown primitive type: " << *Ty << "\n";
530 // Pass the Type* and the variable name and this prints out the variable
533 raw_ostream &CWriter::printType(raw_ostream &Out, const Type *Ty,
534 bool isSigned, const std::string &NameSoFar,
535 bool IgnoreName, const AttrListPtr &PAL) {
536 if (Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) {
537 printSimpleType(Out, Ty, isSigned, NameSoFar);
541 // Check to see if the type is named.
542 if (!IgnoreName || Ty->isOpaqueTy()) {
543 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
544 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
547 switch (Ty->getTypeID()) {
548 case Type::FunctionTyID: {
549 const FunctionType *FTy = cast<FunctionType>(Ty);
551 raw_string_ostream FunctionInnards(tstr);
552 FunctionInnards << " (" << NameSoFar << ") (";
554 for (FunctionType::param_iterator I = FTy->param_begin(),
555 E = FTy->param_end(); I != E; ++I) {
556 const Type *ArgTy = *I;
557 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
558 assert(ArgTy->isPointerTy());
559 ArgTy = cast<PointerType>(ArgTy)->getElementType();
561 if (I != FTy->param_begin())
562 FunctionInnards << ", ";
563 printType(FunctionInnards, ArgTy,
564 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
567 if (FTy->isVarArg()) {
568 if (FTy->getNumParams())
569 FunctionInnards << ", ...";
570 } else if (!FTy->getNumParams()) {
571 FunctionInnards << "void";
573 FunctionInnards << ')';
574 printType(Out, FTy->getReturnType(),
575 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
578 case Type::StructTyID: {
579 const StructType *STy = cast<StructType>(Ty);
580 Out << NameSoFar + " {\n";
582 for (StructType::element_iterator I = STy->element_begin(),
583 E = STy->element_end(); I != E; ++I) {
585 printType(Out, *I, false, "field" + utostr(Idx++));
590 Out << " __attribute__ ((packed))";
594 case Type::PointerTyID: {
595 const PointerType *PTy = cast<PointerType>(Ty);
596 std::string ptrName = "*" + NameSoFar;
598 if (PTy->getElementType()->isArrayTy() ||
599 PTy->getElementType()->isVectorTy())
600 ptrName = "(" + ptrName + ")";
603 // Must be a function ptr cast!
604 return printType(Out, PTy->getElementType(), false, ptrName, true, PAL);
605 return printType(Out, PTy->getElementType(), false, ptrName);
608 case Type::ArrayTyID: {
609 const ArrayType *ATy = cast<ArrayType>(Ty);
610 unsigned NumElements = ATy->getNumElements();
611 if (NumElements == 0) NumElements = 1;
612 // Arrays are wrapped in structs to allow them to have normal
613 // value semantics (avoiding the array "decay").
614 Out << NameSoFar << " { ";
615 printType(Out, ATy->getElementType(), false,
616 "array[" + utostr(NumElements) + "]");
620 case Type::OpaqueTyID: {
621 std::string TyName = "struct opaque_" + itostr(OpaqueCounter++);
622 assert(TypeNames.find(Ty) == TypeNames.end());
623 TypeNames[Ty] = TyName;
624 return Out << TyName << ' ' << NameSoFar;
627 llvm_unreachable("Unhandled case in getTypeProps!");
633 void CWriter::printConstantArray(ConstantArray *CPA, bool Static) {
635 // As a special case, print the array as a string if it is an array of
636 // ubytes or an array of sbytes with positive values.
638 const Type *ETy = CPA->getType()->getElementType();
639 bool isString = (ETy == Type::getInt8Ty(CPA->getContext()) ||
640 ETy == Type::getInt8Ty(CPA->getContext()));
642 // Make sure the last character is a null char, as automatically added by C
643 if (isString && (CPA->getNumOperands() == 0 ||
644 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
649 // Keep track of whether the last number was a hexadecimal escape
650 bool LastWasHex = false;
652 // Do not include the last character, which we know is null
653 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
654 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
656 // Print it out literally if it is a printable character. The only thing
657 // to be careful about is when the last letter output was a hex escape
658 // code, in which case we have to be careful not to print out hex digits
659 // explicitly (the C compiler thinks it is a continuation of the previous
660 // character, sheesh...)
662 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
664 if (C == '"' || C == '\\')
665 Out << "\\" << (char)C;
671 case '\n': Out << "\\n"; break;
672 case '\t': Out << "\\t"; break;
673 case '\r': Out << "\\r"; break;
674 case '\v': Out << "\\v"; break;
675 case '\a': Out << "\\a"; break;
676 case '\"': Out << "\\\""; break;
677 case '\'': Out << "\\\'"; break;
680 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
681 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
690 if (CPA->getNumOperands()) {
692 printConstant(cast<Constant>(CPA->getOperand(0)), Static);
693 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
695 printConstant(cast<Constant>(CPA->getOperand(i)), Static);
702 void CWriter::printConstantVector(ConstantVector *CP, bool Static) {
704 if (CP->getNumOperands()) {
706 printConstant(cast<Constant>(CP->getOperand(0)), Static);
707 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
709 printConstant(cast<Constant>(CP->getOperand(i)), Static);
715 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
716 // textually as a double (rather than as a reference to a stack-allocated
717 // variable). We decide this by converting CFP to a string and back into a
718 // double, and then checking whether the conversion results in a bit-equal
719 // double to the original value of CFP. This depends on us and the target C
720 // compiler agreeing on the conversion process (which is pretty likely since we
721 // only deal in IEEE FP).
723 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
725 // Do long doubles in hex for now.
726 if (CFP->getType() != Type::getFloatTy(CFP->getContext()) &&
727 CFP->getType() != Type::getDoubleTy(CFP->getContext()))
729 APFloat APF = APFloat(CFP->getValueAPF()); // copy
730 if (CFP->getType() == Type::getFloatTy(CFP->getContext()))
731 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &ignored);
732 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
734 sprintf(Buffer, "%a", APF.convertToDouble());
735 if (!strncmp(Buffer, "0x", 2) ||
736 !strncmp(Buffer, "-0x", 3) ||
737 !strncmp(Buffer, "+0x", 3))
738 return APF.bitwiseIsEqual(APFloat(atof(Buffer)));
741 std::string StrVal = ftostr(APF);
743 while (StrVal[0] == ' ')
744 StrVal.erase(StrVal.begin());
746 // Check to make sure that the stringized number is not some string like "Inf"
747 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
748 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
749 ((StrVal[0] == '-' || StrVal[0] == '+') &&
750 (StrVal[1] >= '0' && StrVal[1] <= '9')))
751 // Reparse stringized version!
752 return APF.bitwiseIsEqual(APFloat(atof(StrVal.c_str())));
757 /// Print out the casting for a cast operation. This does the double casting
758 /// necessary for conversion to the destination type, if necessary.
759 /// @brief Print a cast
760 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
761 // Print the destination type cast
763 case Instruction::UIToFP:
764 case Instruction::SIToFP:
765 case Instruction::IntToPtr:
766 case Instruction::Trunc:
767 case Instruction::BitCast:
768 case Instruction::FPExt:
769 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
771 printType(Out, DstTy);
774 case Instruction::ZExt:
775 case Instruction::PtrToInt:
776 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
778 printSimpleType(Out, DstTy, false);
781 case Instruction::SExt:
782 case Instruction::FPToSI: // For these, make sure we get a signed dest
784 printSimpleType(Out, DstTy, true);
788 llvm_unreachable("Invalid cast opcode");
791 // Print the source type cast
793 case Instruction::UIToFP:
794 case Instruction::ZExt:
796 printSimpleType(Out, SrcTy, false);
799 case Instruction::SIToFP:
800 case Instruction::SExt:
802 printSimpleType(Out, SrcTy, true);
805 case Instruction::IntToPtr:
806 case Instruction::PtrToInt:
807 // Avoid "cast to pointer from integer of different size" warnings
808 Out << "(unsigned long)";
810 case Instruction::Trunc:
811 case Instruction::BitCast:
812 case Instruction::FPExt:
813 case Instruction::FPTrunc:
814 case Instruction::FPToSI:
815 case Instruction::FPToUI:
816 break; // These don't need a source cast.
818 llvm_unreachable("Invalid cast opcode");
823 // printConstant - The LLVM Constant to C Constant converter.
824 void CWriter::printConstant(Constant *CPV, bool Static) {
825 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
826 switch (CE->getOpcode()) {
827 case Instruction::Trunc:
828 case Instruction::ZExt:
829 case Instruction::SExt:
830 case Instruction::FPTrunc:
831 case Instruction::FPExt:
832 case Instruction::UIToFP:
833 case Instruction::SIToFP:
834 case Instruction::FPToUI:
835 case Instruction::FPToSI:
836 case Instruction::PtrToInt:
837 case Instruction::IntToPtr:
838 case Instruction::BitCast:
840 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
841 if (CE->getOpcode() == Instruction::SExt &&
842 CE->getOperand(0)->getType() == Type::getInt1Ty(CPV->getContext())) {
843 // Make sure we really sext from bool here by subtracting from 0
846 printConstant(CE->getOperand(0), Static);
847 if (CE->getType() == Type::getInt1Ty(CPV->getContext()) &&
848 (CE->getOpcode() == Instruction::Trunc ||
849 CE->getOpcode() == Instruction::FPToUI ||
850 CE->getOpcode() == Instruction::FPToSI ||
851 CE->getOpcode() == Instruction::PtrToInt)) {
852 // Make sure we really truncate to bool here by anding with 1
858 case Instruction::GetElementPtr:
860 printGEPExpression(CE->getOperand(0), gep_type_begin(CPV),
861 gep_type_end(CPV), Static);
864 case Instruction::Select:
866 printConstant(CE->getOperand(0), Static);
868 printConstant(CE->getOperand(1), Static);
870 printConstant(CE->getOperand(2), Static);
873 case Instruction::Add:
874 case Instruction::FAdd:
875 case Instruction::Sub:
876 case Instruction::FSub:
877 case Instruction::Mul:
878 case Instruction::FMul:
879 case Instruction::SDiv:
880 case Instruction::UDiv:
881 case Instruction::FDiv:
882 case Instruction::URem:
883 case Instruction::SRem:
884 case Instruction::FRem:
885 case Instruction::And:
886 case Instruction::Or:
887 case Instruction::Xor:
888 case Instruction::ICmp:
889 case Instruction::Shl:
890 case Instruction::LShr:
891 case Instruction::AShr:
894 bool NeedsClosingParens = printConstExprCast(CE, Static);
895 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
896 switch (CE->getOpcode()) {
897 case Instruction::Add:
898 case Instruction::FAdd: Out << " + "; break;
899 case Instruction::Sub:
900 case Instruction::FSub: Out << " - "; break;
901 case Instruction::Mul:
902 case Instruction::FMul: Out << " * "; break;
903 case Instruction::URem:
904 case Instruction::SRem:
905 case Instruction::FRem: Out << " % "; break;
906 case Instruction::UDiv:
907 case Instruction::SDiv:
908 case Instruction::FDiv: Out << " / "; break;
909 case Instruction::And: Out << " & "; break;
910 case Instruction::Or: Out << " | "; break;
911 case Instruction::Xor: Out << " ^ "; break;
912 case Instruction::Shl: Out << " << "; break;
913 case Instruction::LShr:
914 case Instruction::AShr: Out << " >> "; break;
915 case Instruction::ICmp:
916 switch (CE->getPredicate()) {
917 case ICmpInst::ICMP_EQ: Out << " == "; break;
918 case ICmpInst::ICMP_NE: Out << " != "; break;
919 case ICmpInst::ICMP_SLT:
920 case ICmpInst::ICMP_ULT: Out << " < "; break;
921 case ICmpInst::ICMP_SLE:
922 case ICmpInst::ICMP_ULE: Out << " <= "; break;
923 case ICmpInst::ICMP_SGT:
924 case ICmpInst::ICMP_UGT: Out << " > "; break;
925 case ICmpInst::ICMP_SGE:
926 case ICmpInst::ICMP_UGE: Out << " >= "; break;
927 default: llvm_unreachable("Illegal ICmp predicate");
930 default: llvm_unreachable("Illegal opcode here!");
932 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
933 if (NeedsClosingParens)
938 case Instruction::FCmp: {
940 bool NeedsClosingParens = printConstExprCast(CE, Static);
941 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
943 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
947 switch (CE->getPredicate()) {
948 default: llvm_unreachable("Illegal FCmp predicate");
949 case FCmpInst::FCMP_ORD: op = "ord"; break;
950 case FCmpInst::FCMP_UNO: op = "uno"; break;
951 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
952 case FCmpInst::FCMP_UNE: op = "une"; break;
953 case FCmpInst::FCMP_ULT: op = "ult"; break;
954 case FCmpInst::FCMP_ULE: op = "ule"; break;
955 case FCmpInst::FCMP_UGT: op = "ugt"; break;
956 case FCmpInst::FCMP_UGE: op = "uge"; break;
957 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
958 case FCmpInst::FCMP_ONE: op = "one"; break;
959 case FCmpInst::FCMP_OLT: op = "olt"; break;
960 case FCmpInst::FCMP_OLE: op = "ole"; break;
961 case FCmpInst::FCMP_OGT: op = "ogt"; break;
962 case FCmpInst::FCMP_OGE: op = "oge"; break;
964 Out << "llvm_fcmp_" << op << "(";
965 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
967 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
970 if (NeedsClosingParens)
977 errs() << "CWriter Error: Unhandled constant expression: "
982 } else if (isa<UndefValue>(CPV) && CPV->getType()->isSingleValueType()) {
984 printType(Out, CPV->getType()); // sign doesn't matter
986 if (!CPV->getType()->isVectorTy()) {
994 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
995 const Type* Ty = CI->getType();
996 if (Ty == Type::getInt1Ty(CPV->getContext()))
997 Out << (CI->getZExtValue() ? '1' : '0');
998 else if (Ty == Type::getInt32Ty(CPV->getContext()))
999 Out << CI->getZExtValue() << 'u';
1000 else if (Ty->getPrimitiveSizeInBits() > 32)
1001 Out << CI->getZExtValue() << "ull";
1004 printSimpleType(Out, Ty, false) << ')';
1005 if (CI->isMinValue(true))
1006 Out << CI->getZExtValue() << 'u';
1008 Out << CI->getSExtValue();
1014 switch (CPV->getType()->getTypeID()) {
1015 case Type::FloatTyID:
1016 case Type::DoubleTyID:
1017 case Type::X86_FP80TyID:
1018 case Type::PPC_FP128TyID:
1019 case Type::FP128TyID: {
1020 ConstantFP *FPC = cast<ConstantFP>(CPV);
1021 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
1022 if (I != FPConstantMap.end()) {
1023 // Because of FP precision problems we must load from a stack allocated
1024 // value that holds the value in hex.
1025 Out << "(*(" << (FPC->getType() == Type::getFloatTy(CPV->getContext()) ?
1027 FPC->getType() == Type::getDoubleTy(CPV->getContext()) ?
1030 << "*)&FPConstant" << I->second << ')';
1033 if (FPC->getType() == Type::getFloatTy(CPV->getContext()))
1034 V = FPC->getValueAPF().convertToFloat();
1035 else if (FPC->getType() == Type::getDoubleTy(CPV->getContext()))
1036 V = FPC->getValueAPF().convertToDouble();
1038 // Long double. Convert the number to double, discarding precision.
1039 // This is not awesome, but it at least makes the CBE output somewhat
1041 APFloat Tmp = FPC->getValueAPF();
1043 Tmp.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &LosesInfo);
1044 V = Tmp.convertToDouble();
1050 // FIXME the actual NaN bits should be emitted.
1051 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
1053 const unsigned long QuietNaN = 0x7ff8UL;
1054 //const unsigned long SignalNaN = 0x7ff4UL;
1056 // We need to grab the first part of the FP #
1059 uint64_t ll = DoubleToBits(V);
1060 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
1062 std::string Num(&Buffer[0], &Buffer[6]);
1063 unsigned long Val = strtoul(Num.c_str(), 0, 16);
1065 if (FPC->getType() == Type::getFloatTy(FPC->getContext()))
1066 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
1067 << Buffer << "\") /*nan*/ ";
1069 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
1070 << Buffer << "\") /*nan*/ ";
1071 } else if (IsInf(V)) {
1073 if (V < 0) Out << '-';
1074 Out << "LLVM_INF" <<
1075 (FPC->getType() == Type::getFloatTy(FPC->getContext()) ? "F" : "")
1079 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
1080 // Print out the constant as a floating point number.
1082 sprintf(Buffer, "%a", V);
1085 Num = ftostr(FPC->getValueAPF());
1093 case Type::ArrayTyID:
1094 // Use C99 compound expression literal initializer syntax.
1097 printType(Out, CPV->getType());
1100 Out << "{ "; // Arrays are wrapped in struct types.
1101 if (ConstantArray *CA = dyn_cast<ConstantArray>(CPV)) {
1102 printConstantArray(CA, Static);
1104 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1105 const ArrayType *AT = cast<ArrayType>(CPV->getType());
1107 if (AT->getNumElements()) {
1109 Constant *CZ = Constant::getNullValue(AT->getElementType());
1110 printConstant(CZ, Static);
1111 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
1113 printConstant(CZ, Static);
1118 Out << " }"; // Arrays are wrapped in struct types.
1121 case Type::VectorTyID:
1122 // Use C99 compound expression literal initializer syntax.
1125 printType(Out, CPV->getType());
1128 if (ConstantVector *CV = dyn_cast<ConstantVector>(CPV)) {
1129 printConstantVector(CV, Static);
1131 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1132 const VectorType *VT = cast<VectorType>(CPV->getType());
1134 Constant *CZ = Constant::getNullValue(VT->getElementType());
1135 printConstant(CZ, Static);
1136 for (unsigned i = 1, e = VT->getNumElements(); i != e; ++i) {
1138 printConstant(CZ, Static);
1144 case Type::StructTyID:
1145 // Use C99 compound expression literal initializer syntax.
1148 printType(Out, CPV->getType());
1151 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
1152 const StructType *ST = cast<StructType>(CPV->getType());
1154 if (ST->getNumElements()) {
1156 printConstant(Constant::getNullValue(ST->getElementType(0)), Static);
1157 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
1159 printConstant(Constant::getNullValue(ST->getElementType(i)), Static);
1165 if (CPV->getNumOperands()) {
1167 printConstant(cast<Constant>(CPV->getOperand(0)), Static);
1168 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
1170 printConstant(cast<Constant>(CPV->getOperand(i)), Static);
1177 case Type::PointerTyID:
1178 if (isa<ConstantPointerNull>(CPV)) {
1180 printType(Out, CPV->getType()); // sign doesn't matter
1181 Out << ")/*NULL*/0)";
1183 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
1184 writeOperand(GV, Static);
1190 errs() << "Unknown constant type: " << *CPV << "\n";
1192 llvm_unreachable(0);
1196 // Some constant expressions need to be casted back to the original types
1197 // because their operands were casted to the expected type. This function takes
1198 // care of detecting that case and printing the cast for the ConstantExpr.
1199 bool CWriter::printConstExprCast(const ConstantExpr* CE, bool Static) {
1200 bool NeedsExplicitCast = false;
1201 const Type *Ty = CE->getOperand(0)->getType();
1202 bool TypeIsSigned = false;
1203 switch (CE->getOpcode()) {
1204 case Instruction::Add:
1205 case Instruction::Sub:
1206 case Instruction::Mul:
1207 // We need to cast integer arithmetic so that it is always performed
1208 // as unsigned, to avoid undefined behavior on overflow.
1209 case Instruction::LShr:
1210 case Instruction::URem:
1211 case Instruction::UDiv: NeedsExplicitCast = true; break;
1212 case Instruction::AShr:
1213 case Instruction::SRem:
1214 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1215 case Instruction::SExt:
1217 NeedsExplicitCast = true;
1218 TypeIsSigned = true;
1220 case Instruction::ZExt:
1221 case Instruction::Trunc:
1222 case Instruction::FPTrunc:
1223 case Instruction::FPExt:
1224 case Instruction::UIToFP:
1225 case Instruction::SIToFP:
1226 case Instruction::FPToUI:
1227 case Instruction::FPToSI:
1228 case Instruction::PtrToInt:
1229 case Instruction::IntToPtr:
1230 case Instruction::BitCast:
1232 NeedsExplicitCast = true;
1236 if (NeedsExplicitCast) {
1238 if (Ty->isIntegerTy() && Ty != Type::getInt1Ty(Ty->getContext()))
1239 printSimpleType(Out, Ty, TypeIsSigned);
1241 printType(Out, Ty); // not integer, sign doesn't matter
1244 return NeedsExplicitCast;
1247 // Print a constant assuming that it is the operand for a given Opcode. The
1248 // opcodes that care about sign need to cast their operands to the expected
1249 // type before the operation proceeds. This function does the casting.
1250 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1252 // Extract the operand's type, we'll need it.
1253 const Type* OpTy = CPV->getType();
1255 // Indicate whether to do the cast or not.
1256 bool shouldCast = false;
1257 bool typeIsSigned = false;
1259 // Based on the Opcode for which this Constant is being written, determine
1260 // the new type to which the operand should be casted by setting the value
1261 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1265 // for most instructions, it doesn't matter
1267 case Instruction::Add:
1268 case Instruction::Sub:
1269 case Instruction::Mul:
1270 // We need to cast integer arithmetic so that it is always performed
1271 // as unsigned, to avoid undefined behavior on overflow.
1272 case Instruction::LShr:
1273 case Instruction::UDiv:
1274 case Instruction::URem:
1277 case Instruction::AShr:
1278 case Instruction::SDiv:
1279 case Instruction::SRem:
1281 typeIsSigned = true;
1285 // Write out the casted constant if we should, otherwise just write the
1289 printSimpleType(Out, OpTy, typeIsSigned);
1291 printConstant(CPV, false);
1294 printConstant(CPV, false);
1297 std::string CWriter::GetValueName(const Value *Operand) {
1298 // Mangle globals with the standard mangler interface for LLC compatibility.
1299 if (const GlobalValue *GV = dyn_cast<GlobalValue>(Operand)) {
1300 SmallString<128> Str;
1301 Mang->getNameWithPrefix(Str, GV, false);
1302 return CBEMangle(Str.str().str());
1305 std::string Name = Operand->getName();
1307 if (Name.empty()) { // Assign unique names to local temporaries.
1308 unsigned &No = AnonValueNumbers[Operand];
1310 No = ++NextAnonValueNumber;
1311 Name = "tmp__" + utostr(No);
1314 std::string VarName;
1315 VarName.reserve(Name.capacity());
1317 for (std::string::iterator I = Name.begin(), E = Name.end();
1321 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1322 (ch >= '0' && ch <= '9') || ch == '_')) {
1324 sprintf(buffer, "_%x_", ch);
1330 return "llvm_cbe_" + VarName;
1333 /// writeInstComputationInline - Emit the computation for the specified
1334 /// instruction inline, with no destination provided.
1335 void CWriter::writeInstComputationInline(Instruction &I) {
1336 // We can't currently support integer types other than 1, 8, 16, 32, 64.
1338 const Type *Ty = I.getType();
1339 if (Ty->isIntegerTy() && (Ty!=Type::getInt1Ty(I.getContext()) &&
1340 Ty!=Type::getInt8Ty(I.getContext()) &&
1341 Ty!=Type::getInt16Ty(I.getContext()) &&
1342 Ty!=Type::getInt32Ty(I.getContext()) &&
1343 Ty!=Type::getInt64Ty(I.getContext()))) {
1344 llvm_report_error("The C backend does not currently support integer "
1345 "types of widths other than 1, 8, 16, 32, 64.\n"
1346 "This is being tracked as PR 4158.");
1349 // If this is a non-trivial bool computation, make sure to truncate down to
1350 // a 1 bit value. This is important because we want "add i1 x, y" to return
1351 // "0" when x and y are true, not "2" for example.
1352 bool NeedBoolTrunc = false;
1353 if (I.getType() == Type::getInt1Ty(I.getContext()) &&
1354 !isa<ICmpInst>(I) && !isa<FCmpInst>(I))
1355 NeedBoolTrunc = true;
1367 void CWriter::writeOperandInternal(Value *Operand, bool Static) {
1368 if (Instruction *I = dyn_cast<Instruction>(Operand))
1369 // Should we inline this instruction to build a tree?
1370 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1372 writeInstComputationInline(*I);
1377 Constant* CPV = dyn_cast<Constant>(Operand);
1379 if (CPV && !isa<GlobalValue>(CPV))
1380 printConstant(CPV, Static);
1382 Out << GetValueName(Operand);
1385 void CWriter::writeOperand(Value *Operand, bool Static) {
1386 bool isAddressImplicit = isAddressExposed(Operand);
1387 if (isAddressImplicit)
1388 Out << "(&"; // Global variables are referenced as their addresses by llvm
1390 writeOperandInternal(Operand, Static);
1392 if (isAddressImplicit)
1396 // Some instructions need to have their result value casted back to the
1397 // original types because their operands were casted to the expected type.
1398 // This function takes care of detecting that case and printing the cast
1399 // for the Instruction.
1400 bool CWriter::writeInstructionCast(const Instruction &I) {
1401 const Type *Ty = I.getOperand(0)->getType();
1402 switch (I.getOpcode()) {
1403 case Instruction::Add:
1404 case Instruction::Sub:
1405 case Instruction::Mul:
1406 // We need to cast integer arithmetic so that it is always performed
1407 // as unsigned, to avoid undefined behavior on overflow.
1408 case Instruction::LShr:
1409 case Instruction::URem:
1410 case Instruction::UDiv:
1412 printSimpleType(Out, Ty, false);
1415 case Instruction::AShr:
1416 case Instruction::SRem:
1417 case Instruction::SDiv:
1419 printSimpleType(Out, Ty, true);
1427 // Write the operand with a cast to another type based on the Opcode being used.
1428 // This will be used in cases where an instruction has specific type
1429 // requirements (usually signedness) for its operands.
1430 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1432 // Extract the operand's type, we'll need it.
1433 const Type* OpTy = Operand->getType();
1435 // Indicate whether to do the cast or not.
1436 bool shouldCast = false;
1438 // Indicate whether the cast should be to a signed type or not.
1439 bool castIsSigned = false;
1441 // Based on the Opcode for which this Operand is being written, determine
1442 // the new type to which the operand should be casted by setting the value
1443 // of OpTy. If we change OpTy, also set shouldCast to true.
1446 // for most instructions, it doesn't matter
1448 case Instruction::Add:
1449 case Instruction::Sub:
1450 case Instruction::Mul:
1451 // We need to cast integer arithmetic so that it is always performed
1452 // as unsigned, to avoid undefined behavior on overflow.
1453 case Instruction::LShr:
1454 case Instruction::UDiv:
1455 case Instruction::URem: // Cast to unsigned first
1457 castIsSigned = false;
1459 case Instruction::GetElementPtr:
1460 case Instruction::AShr:
1461 case Instruction::SDiv:
1462 case Instruction::SRem: // Cast to signed first
1464 castIsSigned = true;
1468 // Write out the casted operand if we should, otherwise just write the
1472 printSimpleType(Out, OpTy, castIsSigned);
1474 writeOperand(Operand);
1477 writeOperand(Operand);
1480 // Write the operand with a cast to another type based on the icmp predicate
1482 void CWriter::writeOperandWithCast(Value* Operand, const ICmpInst &Cmp) {
1483 // This has to do a cast to ensure the operand has the right signedness.
1484 // Also, if the operand is a pointer, we make sure to cast to an integer when
1485 // doing the comparison both for signedness and so that the C compiler doesn't
1486 // optimize things like "p < NULL" to false (p may contain an integer value
1488 bool shouldCast = Cmp.isRelational();
1490 // Write out the casted operand if we should, otherwise just write the
1493 writeOperand(Operand);
1497 // Should this be a signed comparison? If so, convert to signed.
1498 bool castIsSigned = Cmp.isSigned();
1500 // If the operand was a pointer, convert to a large integer type.
1501 const Type* OpTy = Operand->getType();
1502 if (OpTy->isPointerTy())
1503 OpTy = TD->getIntPtrType(Operand->getContext());
1506 printSimpleType(Out, OpTy, castIsSigned);
1508 writeOperand(Operand);
1512 // generateCompilerSpecificCode - This is where we add conditional compilation
1513 // directives to cater to specific compilers as need be.
1515 static void generateCompilerSpecificCode(formatted_raw_ostream& Out,
1516 const TargetData *TD) {
1517 // Alloca is hard to get, and we don't want to include stdlib.h here.
1518 Out << "/* get a declaration for alloca */\n"
1519 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1520 << "#define alloca(x) __builtin_alloca((x))\n"
1521 << "#define _alloca(x) __builtin_alloca((x))\n"
1522 << "#elif defined(__APPLE__)\n"
1523 << "extern void *__builtin_alloca(unsigned long);\n"
1524 << "#define alloca(x) __builtin_alloca(x)\n"
1525 << "#define longjmp _longjmp\n"
1526 << "#define setjmp _setjmp\n"
1527 << "#elif defined(__sun__)\n"
1528 << "#if defined(__sparcv9)\n"
1529 << "extern void *__builtin_alloca(unsigned long);\n"
1531 << "extern void *__builtin_alloca(unsigned int);\n"
1533 << "#define alloca(x) __builtin_alloca(x)\n"
1534 << "#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__arm__)\n"
1535 << "#define alloca(x) __builtin_alloca(x)\n"
1536 << "#elif defined(_MSC_VER)\n"
1537 << "#define inline _inline\n"
1538 << "#define alloca(x) _alloca(x)\n"
1540 << "#include <alloca.h>\n"
1543 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1544 // If we aren't being compiled with GCC, just drop these attributes.
1545 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1546 << "#define __attribute__(X)\n"
1549 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1550 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1551 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1552 << "#elif defined(__GNUC__)\n"
1553 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1555 << "#define __EXTERNAL_WEAK__\n"
1558 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1559 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1560 << "#define __ATTRIBUTE_WEAK__\n"
1561 << "#elif defined(__GNUC__)\n"
1562 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1564 << "#define __ATTRIBUTE_WEAK__\n"
1567 // Add hidden visibility support. FIXME: APPLE_CC?
1568 Out << "#if defined(__GNUC__)\n"
1569 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1572 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1573 // From the GCC documentation:
1575 // double __builtin_nan (const char *str)
1577 // This is an implementation of the ISO C99 function nan.
1579 // Since ISO C99 defines this function in terms of strtod, which we do
1580 // not implement, a description of the parsing is in order. The string is
1581 // parsed as by strtol; that is, the base is recognized by leading 0 or
1582 // 0x prefixes. The number parsed is placed in the significand such that
1583 // the least significant bit of the number is at the least significant
1584 // bit of the significand. The number is truncated to fit the significand
1585 // field provided. The significand is forced to be a quiet NaN.
1587 // This function, if given a string literal, is evaluated early enough
1588 // that it is considered a compile-time constant.
1590 // float __builtin_nanf (const char *str)
1592 // Similar to __builtin_nan, except the return type is float.
1594 // double __builtin_inf (void)
1596 // Similar to __builtin_huge_val, except a warning is generated if the
1597 // target floating-point format does not support infinities. This
1598 // function is suitable for implementing the ISO C99 macro INFINITY.
1600 // float __builtin_inff (void)
1602 // Similar to __builtin_inf, except the return type is float.
1603 Out << "#ifdef __GNUC__\n"
1604 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1605 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1606 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1607 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1608 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1609 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1610 << "#define LLVM_PREFETCH(addr,rw,locality) "
1611 "__builtin_prefetch(addr,rw,locality)\n"
1612 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1613 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1614 << "#define LLVM_ASM __asm__\n"
1616 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1617 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1618 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1619 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1620 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1621 << "#define LLVM_INFF 0.0F /* Float */\n"
1622 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1623 << "#define __ATTRIBUTE_CTOR__\n"
1624 << "#define __ATTRIBUTE_DTOR__\n"
1625 << "#define LLVM_ASM(X)\n"
1628 Out << "#if __GNUC__ < 4 /* Old GCC's, or compilers not GCC */ \n"
1629 << "#define __builtin_stack_save() 0 /* not implemented */\n"
1630 << "#define __builtin_stack_restore(X) /* noop */\n"
1633 // Output typedefs for 128-bit integers. If these are needed with a
1634 // 32-bit target or with a C compiler that doesn't support mode(TI),
1635 // more drastic measures will be needed.
1636 Out << "#if __GNUC__ && __LP64__ /* 128-bit integer types */\n"
1637 << "typedef int __attribute__((mode(TI))) llvmInt128;\n"
1638 << "typedef unsigned __attribute__((mode(TI))) llvmUInt128;\n"
1641 // Output target-specific code that should be inserted into main.
1642 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1645 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1646 /// the StaticTors set.
1647 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1648 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1649 if (!InitList) return;
1651 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1652 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1653 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1655 if (CS->getOperand(1)->isNullValue())
1656 return; // Found a null terminator, exit printing.
1657 Constant *FP = CS->getOperand(1);
1658 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1660 FP = CE->getOperand(0);
1661 if (Function *F = dyn_cast<Function>(FP))
1662 StaticTors.insert(F);
1666 enum SpecialGlobalClass {
1668 GlobalCtors, GlobalDtors,
1672 /// getGlobalVariableClass - If this is a global that is specially recognized
1673 /// by LLVM, return a code that indicates how we should handle it.
1674 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1675 // If this is a global ctors/dtors list, handle it now.
1676 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1677 if (GV->getName() == "llvm.global_ctors")
1679 else if (GV->getName() == "llvm.global_dtors")
1683 // Otherwise, if it is other metadata, don't print it. This catches things
1684 // like debug information.
1685 if (GV->getSection() == "llvm.metadata")
1691 // PrintEscapedString - Print each character of the specified string, escaping
1692 // it if it is not printable or if it is an escape char.
1693 static void PrintEscapedString(const char *Str, unsigned Length,
1695 for (unsigned i = 0; i != Length; ++i) {
1696 unsigned char C = Str[i];
1697 if (isprint(C) && C != '\\' && C != '"')
1706 Out << "\\x" << hexdigit(C >> 4) << hexdigit(C & 0x0F);
1710 // PrintEscapedString - Print each character of the specified string, escaping
1711 // it if it is not printable or if it is an escape char.
1712 static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
1713 PrintEscapedString(Str.c_str(), Str.size(), Out);
1716 bool CWriter::doInitialization(Module &M) {
1717 FunctionPass::doInitialization(M);
1722 TD = new TargetData(&M);
1723 IL = new IntrinsicLowering(*TD);
1724 IL->AddPrototypes(M);
1727 std::string Triple = TheModule->getTargetTriple();
1729 Triple = llvm::sys::getHostTriple();
1732 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
1733 TAsm = Match->createAsmInfo(Triple);
1735 TAsm = new CBEMCAsmInfo();
1736 TCtx = new MCContext(*TAsm);
1737 Mang = new Mangler(*TCtx);
1739 // Keep track of which functions are static ctors/dtors so they can have
1740 // an attribute added to their prototypes.
1741 std::set<Function*> StaticCtors, StaticDtors;
1742 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1744 switch (getGlobalVariableClass(I)) {
1747 FindStaticTors(I, StaticCtors);
1750 FindStaticTors(I, StaticDtors);
1755 // get declaration for alloca
1756 Out << "/* Provide Declarations */\n";
1757 Out << "#include <stdarg.h>\n"; // Varargs support
1758 Out << "#include <setjmp.h>\n"; // Unwind support
1759 generateCompilerSpecificCode(Out, TD);
1761 // Provide a definition for `bool' if not compiling with a C++ compiler.
1763 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1765 << "\n\n/* Support for floating point constants */\n"
1766 << "typedef unsigned long long ConstantDoubleTy;\n"
1767 << "typedef unsigned int ConstantFloatTy;\n"
1768 << "typedef struct { unsigned long long f1; unsigned short f2; "
1769 "unsigned short pad[3]; } ConstantFP80Ty;\n"
1770 // This is used for both kinds of 128-bit long double; meaning differs.
1771 << "typedef struct { unsigned long long f1; unsigned long long f2; }"
1772 " ConstantFP128Ty;\n"
1773 << "\n\n/* Global Declarations */\n";
1775 // First output all the declarations for the program, because C requires
1776 // Functions & globals to be declared before they are used.
1778 if (!M.getModuleInlineAsm().empty()) {
1779 Out << "/* Module asm statements */\n"
1782 // Split the string into lines, to make it easier to read the .ll file.
1783 std::string Asm = M.getModuleInlineAsm();
1785 size_t NewLine = Asm.find_first_of('\n', CurPos);
1786 while (NewLine != std::string::npos) {
1787 // We found a newline, print the portion of the asm string from the
1788 // last newline up to this newline.
1790 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.begin()+NewLine),
1794 NewLine = Asm.find_first_of('\n', CurPos);
1797 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.end()), Out);
1799 << "/* End Module asm statements */\n";
1802 // Loop over the symbol table, emitting all named constants...
1803 printModuleTypes(M.getTypeSymbolTable());
1805 // Global variable declarations...
1806 if (!M.global_empty()) {
1807 Out << "\n/* External Global Variable Declarations */\n";
1808 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1811 if (I->hasExternalLinkage() || I->hasExternalWeakLinkage() ||
1812 I->hasCommonLinkage())
1814 else if (I->hasDLLImportLinkage())
1815 Out << "__declspec(dllimport) ";
1817 continue; // Internal Global
1819 // Thread Local Storage
1820 if (I->isThreadLocal())
1823 printType(Out, I->getType()->getElementType(), false, GetValueName(I));
1825 if (I->hasExternalWeakLinkage())
1826 Out << " __EXTERNAL_WEAK__";
1831 // Function declarations
1832 Out << "\n/* Function Declarations */\n";
1833 Out << "double fmod(double, double);\n"; // Support for FP rem
1834 Out << "float fmodf(float, float);\n";
1835 Out << "long double fmodl(long double, long double);\n";
1837 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1838 // Don't print declarations for intrinsic functions.
1839 if (!I->isIntrinsic() && I->getName() != "setjmp" &&
1840 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1841 if (I->hasExternalWeakLinkage())
1843 printFunctionSignature(I, true);
1844 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1845 Out << " __ATTRIBUTE_WEAK__";
1846 if (I->hasExternalWeakLinkage())
1847 Out << " __EXTERNAL_WEAK__";
1848 if (StaticCtors.count(I))
1849 Out << " __ATTRIBUTE_CTOR__";
1850 if (StaticDtors.count(I))
1851 Out << " __ATTRIBUTE_DTOR__";
1852 if (I->hasHiddenVisibility())
1853 Out << " __HIDDEN__";
1855 if (I->hasName() && I->getName()[0] == 1)
1856 Out << " LLVM_ASM(\"" << I->getName().substr(1) << "\")";
1862 // Output the global variable declarations
1863 if (!M.global_empty()) {
1864 Out << "\n\n/* Global Variable Declarations */\n";
1865 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1867 if (!I->isDeclaration()) {
1868 // Ignore special globals, such as debug info.
1869 if (getGlobalVariableClass(I))
1872 if (I->hasLocalLinkage())
1877 // Thread Local Storage
1878 if (I->isThreadLocal())
1881 printType(Out, I->getType()->getElementType(), false,
1884 if (I->hasLinkOnceLinkage())
1885 Out << " __attribute__((common))";
1886 else if (I->hasCommonLinkage()) // FIXME is this right?
1887 Out << " __ATTRIBUTE_WEAK__";
1888 else if (I->hasWeakLinkage())
1889 Out << " __ATTRIBUTE_WEAK__";
1890 else if (I->hasExternalWeakLinkage())
1891 Out << " __EXTERNAL_WEAK__";
1892 if (I->hasHiddenVisibility())
1893 Out << " __HIDDEN__";
1898 // Output the global variable definitions and contents...
1899 if (!M.global_empty()) {
1900 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1901 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1903 if (!I->isDeclaration()) {
1904 // Ignore special globals, such as debug info.
1905 if (getGlobalVariableClass(I))
1908 if (I->hasLocalLinkage())
1910 else if (I->hasDLLImportLinkage())
1911 Out << "__declspec(dllimport) ";
1912 else if (I->hasDLLExportLinkage())
1913 Out << "__declspec(dllexport) ";
1915 // Thread Local Storage
1916 if (I->isThreadLocal())
1919 printType(Out, I->getType()->getElementType(), false,
1921 if (I->hasLinkOnceLinkage())
1922 Out << " __attribute__((common))";
1923 else if (I->hasWeakLinkage())
1924 Out << " __ATTRIBUTE_WEAK__";
1925 else if (I->hasCommonLinkage())
1926 Out << " __ATTRIBUTE_WEAK__";
1928 if (I->hasHiddenVisibility())
1929 Out << " __HIDDEN__";
1931 // If the initializer is not null, emit the initializer. If it is null,
1932 // we try to avoid emitting large amounts of zeros. The problem with
1933 // this, however, occurs when the variable has weak linkage. In this
1934 // case, the assembler will complain about the variable being both weak
1935 // and common, so we disable this optimization.
1936 // FIXME common linkage should avoid this problem.
1937 if (!I->getInitializer()->isNullValue()) {
1939 writeOperand(I->getInitializer(), true);
1940 } else if (I->hasWeakLinkage()) {
1941 // We have to specify an initializer, but it doesn't have to be
1942 // complete. If the value is an aggregate, print out { 0 }, and let
1943 // the compiler figure out the rest of the zeros.
1945 if (I->getInitializer()->getType()->isStructTy() ||
1946 I->getInitializer()->getType()->isVectorTy()) {
1948 } else if (I->getInitializer()->getType()->isArrayTy()) {
1949 // As with structs and vectors, but with an extra set of braces
1950 // because arrays are wrapped in structs.
1953 // Just print it out normally.
1954 writeOperand(I->getInitializer(), true);
1962 Out << "\n\n/* Function Bodies */\n";
1964 // Emit some helper functions for dealing with FCMP instruction's
1966 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1967 Out << "return X == X && Y == Y; }\n";
1968 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1969 Out << "return X != X || Y != Y; }\n";
1970 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1971 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1972 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1973 Out << "return X != Y; }\n";
1974 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1975 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1976 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1977 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1978 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1979 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1980 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1981 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1982 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1983 Out << "return X == Y ; }\n";
1984 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1985 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1986 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1987 Out << "return X < Y ; }\n";
1988 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1989 Out << "return X > Y ; }\n";
1990 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1991 Out << "return X <= Y ; }\n";
1992 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1993 Out << "return X >= Y ; }\n";
1998 /// Output all floating point constants that cannot be printed accurately...
1999 void CWriter::printFloatingPointConstants(Function &F) {
2000 // Scan the module for floating point constants. If any FP constant is used
2001 // in the function, we want to redirect it here so that we do not depend on
2002 // the precision of the printed form, unless the printed form preserves
2005 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
2007 printFloatingPointConstants(*I);
2012 void CWriter::printFloatingPointConstants(const Constant *C) {
2013 // If this is a constant expression, recursively check for constant fp values.
2014 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
2015 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
2016 printFloatingPointConstants(CE->getOperand(i));
2020 // Otherwise, check for a FP constant that we need to print.
2021 const ConstantFP *FPC = dyn_cast<ConstantFP>(C);
2023 // Do not put in FPConstantMap if safe.
2024 isFPCSafeToPrint(FPC) ||
2025 // Already printed this constant?
2026 FPConstantMap.count(FPC))
2029 FPConstantMap[FPC] = FPCounter; // Number the FP constants
2031 if (FPC->getType() == Type::getDoubleTy(FPC->getContext())) {
2032 double Val = FPC->getValueAPF().convertToDouble();
2033 uint64_t i = FPC->getValueAPF().bitcastToAPInt().getZExtValue();
2034 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
2035 << " = 0x" << utohexstr(i)
2036 << "ULL; /* " << Val << " */\n";
2037 } else if (FPC->getType() == Type::getFloatTy(FPC->getContext())) {
2038 float Val = FPC->getValueAPF().convertToFloat();
2039 uint32_t i = (uint32_t)FPC->getValueAPF().bitcastToAPInt().
2041 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
2042 << " = 0x" << utohexstr(i)
2043 << "U; /* " << Val << " */\n";
2044 } else if (FPC->getType() == Type::getX86_FP80Ty(FPC->getContext())) {
2045 // api needed to prevent premature destruction
2046 APInt api = FPC->getValueAPF().bitcastToAPInt();
2047 const uint64_t *p = api.getRawData();
2048 Out << "static const ConstantFP80Ty FPConstant" << FPCounter++
2049 << " = { 0x" << utohexstr(p[0])
2050 << "ULL, 0x" << utohexstr((uint16_t)p[1]) << ",{0,0,0}"
2051 << "}; /* Long double constant */\n";
2052 } else if (FPC->getType() == Type::getPPC_FP128Ty(FPC->getContext()) ||
2053 FPC->getType() == Type::getFP128Ty(FPC->getContext())) {
2054 APInt api = FPC->getValueAPF().bitcastToAPInt();
2055 const uint64_t *p = api.getRawData();
2056 Out << "static const ConstantFP128Ty FPConstant" << FPCounter++
2058 << utohexstr(p[0]) << ", 0x" << utohexstr(p[1])
2059 << "}; /* Long double constant */\n";
2062 llvm_unreachable("Unknown float type!");
2068 /// printSymbolTable - Run through symbol table looking for type names. If a
2069 /// type name is found, emit its declaration...
2071 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
2072 Out << "/* Helper union for bitcasts */\n";
2073 Out << "typedef union {\n";
2074 Out << " unsigned int Int32;\n";
2075 Out << " unsigned long long Int64;\n";
2076 Out << " float Float;\n";
2077 Out << " double Double;\n";
2078 Out << "} llvmBitCastUnion;\n";
2080 // We are only interested in the type plane of the symbol table.
2081 TypeSymbolTable::const_iterator I = TST.begin();
2082 TypeSymbolTable::const_iterator End = TST.end();
2084 // If there are no type names, exit early.
2085 if (I == End) return;
2087 // Print out forward declarations for structure types before anything else!
2088 Out << "/* Structure forward decls */\n";
2089 for (; I != End; ++I) {
2090 std::string Name = "struct " + CBEMangle("l_"+I->first);
2091 Out << Name << ";\n";
2092 TypeNames.insert(std::make_pair(I->second, Name));
2097 // Now we can print out typedefs. Above, we guaranteed that this can only be
2098 // for struct or opaque types.
2099 Out << "/* Typedefs */\n";
2100 for (I = TST.begin(); I != End; ++I) {
2101 std::string Name = CBEMangle("l_"+I->first);
2103 printType(Out, I->second, false, Name);
2109 // Keep track of which structures have been printed so far...
2110 std::set<const Type *> StructPrinted;
2112 // Loop over all structures then push them into the stack so they are
2113 // printed in the correct order.
2115 Out << "/* Structure contents */\n";
2116 for (I = TST.begin(); I != End; ++I)
2117 if (I->second->isStructTy() || I->second->isArrayTy())
2118 // Only print out used types!
2119 printContainedStructs(I->second, StructPrinted);
2122 // Push the struct onto the stack and recursively push all structs
2123 // this one depends on.
2125 // TODO: Make this work properly with vector types
2127 void CWriter::printContainedStructs(const Type *Ty,
2128 std::set<const Type*> &StructPrinted) {
2129 // Don't walk through pointers.
2130 if (Ty->isPointerTy() || Ty->isPrimitiveType() || Ty->isIntegerTy())
2133 // Print all contained types first.
2134 for (Type::subtype_iterator I = Ty->subtype_begin(),
2135 E = Ty->subtype_end(); I != E; ++I)
2136 printContainedStructs(*I, StructPrinted);
2138 if (Ty->isStructTy() || Ty->isArrayTy()) {
2139 // Check to see if we have already printed this struct.
2140 if (StructPrinted.insert(Ty).second) {
2141 // Print structure type out.
2142 std::string Name = TypeNames[Ty];
2143 printType(Out, Ty, false, Name, true);
2149 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
2150 /// isStructReturn - Should this function actually return a struct by-value?
2151 bool isStructReturn = F->hasStructRetAttr();
2153 if (F->hasLocalLinkage()) Out << "static ";
2154 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
2155 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
2156 switch (F->getCallingConv()) {
2157 case CallingConv::X86_StdCall:
2158 Out << "__attribute__((stdcall)) ";
2160 case CallingConv::X86_FastCall:
2161 Out << "__attribute__((fastcall)) ";
2167 // Loop over the arguments, printing them...
2168 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
2169 const AttrListPtr &PAL = F->getAttributes();
2172 raw_string_ostream FunctionInnards(tstr);
2174 // Print out the name...
2175 FunctionInnards << GetValueName(F) << '(';
2177 bool PrintedArg = false;
2178 if (!F->isDeclaration()) {
2179 if (!F->arg_empty()) {
2180 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
2183 // If this is a struct-return function, don't print the hidden
2184 // struct-return argument.
2185 if (isStructReturn) {
2186 assert(I != E && "Invalid struct return function!");
2191 std::string ArgName;
2192 for (; I != E; ++I) {
2193 if (PrintedArg) FunctionInnards << ", ";
2194 if (I->hasName() || !Prototype)
2195 ArgName = GetValueName(I);
2198 const Type *ArgTy = I->getType();
2199 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2200 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2201 ByValParams.insert(I);
2203 printType(FunctionInnards, ArgTy,
2204 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt),
2211 // Loop over the arguments, printing them.
2212 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
2215 // If this is a struct-return function, don't print the hidden
2216 // struct-return argument.
2217 if (isStructReturn) {
2218 assert(I != E && "Invalid struct return function!");
2223 for (; I != E; ++I) {
2224 if (PrintedArg) FunctionInnards << ", ";
2225 const Type *ArgTy = *I;
2226 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2227 assert(ArgTy->isPointerTy());
2228 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2230 printType(FunctionInnards, ArgTy,
2231 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt));
2237 // Finish printing arguments... if this is a vararg function, print the ...,
2238 // unless there are no known types, in which case, we just emit ().
2240 if (FT->isVarArg() && PrintedArg) {
2241 if (PrintedArg) FunctionInnards << ", ";
2242 FunctionInnards << "..."; // Output varargs portion of signature!
2243 } else if (!FT->isVarArg() && !PrintedArg) {
2244 FunctionInnards << "void"; // ret() -> ret(void) in C.
2246 FunctionInnards << ')';
2248 // Get the return tpe for the function.
2250 if (!isStructReturn)
2251 RetTy = F->getReturnType();
2253 // If this is a struct-return function, print the struct-return type.
2254 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
2257 // Print out the return type and the signature built above.
2258 printType(Out, RetTy,
2259 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt),
2260 FunctionInnards.str());
2263 static inline bool isFPIntBitCast(const Instruction &I) {
2264 if (!isa<BitCastInst>(I))
2266 const Type *SrcTy = I.getOperand(0)->getType();
2267 const Type *DstTy = I.getType();
2268 return (SrcTy->isFloatingPointTy() && DstTy->isIntegerTy()) ||
2269 (DstTy->isFloatingPointTy() && SrcTy->isIntegerTy());
2272 void CWriter::printFunction(Function &F) {
2273 /// isStructReturn - Should this function actually return a struct by-value?
2274 bool isStructReturn = F.hasStructRetAttr();
2276 printFunctionSignature(&F, false);
2279 // If this is a struct return function, handle the result with magic.
2280 if (isStructReturn) {
2281 const Type *StructTy =
2282 cast<PointerType>(F.arg_begin()->getType())->getElementType();
2284 printType(Out, StructTy, false, "StructReturn");
2285 Out << "; /* Struct return temporary */\n";
2288 printType(Out, F.arg_begin()->getType(), false,
2289 GetValueName(F.arg_begin()));
2290 Out << " = &StructReturn;\n";
2293 bool PrintedVar = false;
2295 // print local variable information for the function
2296 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
2297 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
2299 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
2300 Out << "; /* Address-exposed local */\n";
2302 } else if (I->getType() != Type::getVoidTy(F.getContext()) &&
2303 !isInlinableInst(*I)) {
2305 printType(Out, I->getType(), false, GetValueName(&*I));
2308 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
2310 printType(Out, I->getType(), false,
2311 GetValueName(&*I)+"__PHI_TEMPORARY");
2316 // We need a temporary for the BitCast to use so it can pluck a value out
2317 // of a union to do the BitCast. This is separate from the need for a
2318 // variable to hold the result of the BitCast.
2319 if (isFPIntBitCast(*I)) {
2320 Out << " llvmBitCastUnion " << GetValueName(&*I)
2321 << "__BITCAST_TEMPORARY;\n";
2329 if (F.hasExternalLinkage() && F.getName() == "main")
2330 Out << " CODE_FOR_MAIN();\n";
2332 // print the basic blocks
2333 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
2334 if (Loop *L = LI->getLoopFor(BB)) {
2335 if (L->getHeader() == BB && L->getParentLoop() == 0)
2338 printBasicBlock(BB);
2345 void CWriter::printLoop(Loop *L) {
2346 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
2347 << "' to make GCC happy */\n";
2348 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
2349 BasicBlock *BB = L->getBlocks()[i];
2350 Loop *BBLoop = LI->getLoopFor(BB);
2352 printBasicBlock(BB);
2353 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
2356 Out << " } while (1); /* end of syntactic loop '"
2357 << L->getHeader()->getName() << "' */\n";
2360 void CWriter::printBasicBlock(BasicBlock *BB) {
2362 // Don't print the label for the basic block if there are no uses, or if
2363 // the only terminator use is the predecessor basic block's terminator.
2364 // We have to scan the use list because PHI nodes use basic blocks too but
2365 // do not require a label to be generated.
2367 bool NeedsLabel = false;
2368 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
2369 if (isGotoCodeNecessary(*PI, BB)) {
2374 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2376 // Output all of the instructions in the basic block...
2377 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2379 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2380 if (II->getType() != Type::getVoidTy(BB->getContext()) &&
2385 writeInstComputationInline(*II);
2390 // Don't emit prefix or suffix for the terminator.
2391 visit(*BB->getTerminator());
2395 // Specific Instruction type classes... note that all of the casts are
2396 // necessary because we use the instruction classes as opaque types...
2398 void CWriter::visitReturnInst(ReturnInst &I) {
2399 // If this is a struct return function, return the temporary struct.
2400 bool isStructReturn = I.getParent()->getParent()->hasStructRetAttr();
2402 if (isStructReturn) {
2403 Out << " return StructReturn;\n";
2407 // Don't output a void return if this is the last basic block in the function
2408 if (I.getNumOperands() == 0 &&
2409 &*--I.getParent()->getParent()->end() == I.getParent() &&
2410 !I.getParent()->size() == 1) {
2414 if (I.getNumOperands() > 1) {
2417 printType(Out, I.getParent()->getParent()->getReturnType());
2418 Out << " llvm_cbe_mrv_temp = {\n";
2419 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
2421 writeOperand(I.getOperand(i));
2427 Out << " return llvm_cbe_mrv_temp;\n";
2433 if (I.getNumOperands()) {
2435 writeOperand(I.getOperand(0));
2440 void CWriter::visitSwitchInst(SwitchInst &SI) {
2443 writeOperand(SI.getOperand(0));
2444 Out << ") {\n default:\n";
2445 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2446 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2448 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2450 writeOperand(SI.getOperand(i));
2452 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2453 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2454 printBranchToBlock(SI.getParent(), Succ, 2);
2455 if (Function::iterator(Succ) == llvm::next(Function::iterator(SI.getParent())))
2461 void CWriter::visitIndirectBrInst(IndirectBrInst &IBI) {
2462 Out << " goto *(void*)(";
2463 writeOperand(IBI.getOperand(0));
2467 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2468 Out << " /*UNREACHABLE*/;\n";
2471 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2472 /// FIXME: This should be reenabled, but loop reordering safe!!
2475 if (llvm::next(Function::iterator(From)) != Function::iterator(To))
2476 return true; // Not the direct successor, we need a goto.
2478 //isa<SwitchInst>(From->getTerminator())
2480 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2485 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2486 BasicBlock *Successor,
2488 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2489 PHINode *PN = cast<PHINode>(I);
2490 // Now we have to do the printing.
2491 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2492 if (!isa<UndefValue>(IV)) {
2493 Out << std::string(Indent, ' ');
2494 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2496 Out << "; /* for PHI node */\n";
2501 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2503 if (isGotoCodeNecessary(CurBB, Succ)) {
2504 Out << std::string(Indent, ' ') << " goto ";
2510 // Branch instruction printing - Avoid printing out a branch to a basic block
2511 // that immediately succeeds the current one.
2513 void CWriter::visitBranchInst(BranchInst &I) {
2515 if (I.isConditional()) {
2516 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2518 writeOperand(I.getCondition());
2521 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2522 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2524 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2525 Out << " } else {\n";
2526 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2527 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2530 // First goto not necessary, assume second one is...
2532 writeOperand(I.getCondition());
2535 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2536 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2541 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2542 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2547 // PHI nodes get copied into temporary values at the end of predecessor basic
2548 // blocks. We now need to copy these temporary values into the REAL value for
2550 void CWriter::visitPHINode(PHINode &I) {
2552 Out << "__PHI_TEMPORARY";
2556 void CWriter::visitBinaryOperator(Instruction &I) {
2557 // binary instructions, shift instructions, setCond instructions.
2558 assert(!I.getType()->isPointerTy());
2560 // We must cast the results of binary operations which might be promoted.
2561 bool needsCast = false;
2562 if ((I.getType() == Type::getInt8Ty(I.getContext())) ||
2563 (I.getType() == Type::getInt16Ty(I.getContext()))
2564 || (I.getType() == Type::getFloatTy(I.getContext()))) {
2567 printType(Out, I.getType(), false);
2571 // If this is a negation operation, print it out as such. For FP, we don't
2572 // want to print "-0.0 - X".
2573 if (BinaryOperator::isNeg(&I)) {
2575 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2577 } else if (BinaryOperator::isFNeg(&I)) {
2579 writeOperand(BinaryOperator::getFNegArgument(cast<BinaryOperator>(&I)));
2581 } else if (I.getOpcode() == Instruction::FRem) {
2582 // Output a call to fmod/fmodf instead of emitting a%b
2583 if (I.getType() == Type::getFloatTy(I.getContext()))
2585 else if (I.getType() == Type::getDoubleTy(I.getContext()))
2587 else // all 3 flavors of long double
2589 writeOperand(I.getOperand(0));
2591 writeOperand(I.getOperand(1));
2595 // Write out the cast of the instruction's value back to the proper type
2597 bool NeedsClosingParens = writeInstructionCast(I);
2599 // Certain instructions require the operand to be forced to a specific type
2600 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2601 // below for operand 1
2602 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2604 switch (I.getOpcode()) {
2605 case Instruction::Add:
2606 case Instruction::FAdd: Out << " + "; break;
2607 case Instruction::Sub:
2608 case Instruction::FSub: Out << " - "; break;
2609 case Instruction::Mul:
2610 case Instruction::FMul: Out << " * "; break;
2611 case Instruction::URem:
2612 case Instruction::SRem:
2613 case Instruction::FRem: Out << " % "; break;
2614 case Instruction::UDiv:
2615 case Instruction::SDiv:
2616 case Instruction::FDiv: Out << " / "; break;
2617 case Instruction::And: Out << " & "; break;
2618 case Instruction::Or: Out << " | "; break;
2619 case Instruction::Xor: Out << " ^ "; break;
2620 case Instruction::Shl : Out << " << "; break;
2621 case Instruction::LShr:
2622 case Instruction::AShr: Out << " >> "; break;
2625 errs() << "Invalid operator type!" << I;
2627 llvm_unreachable(0);
2630 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2631 if (NeedsClosingParens)
2640 void CWriter::visitICmpInst(ICmpInst &I) {
2641 // We must cast the results of icmp which might be promoted.
2642 bool needsCast = false;
2644 // Write out the cast of the instruction's value back to the proper type
2646 bool NeedsClosingParens = writeInstructionCast(I);
2648 // Certain icmp predicate require the operand to be forced to a specific type
2649 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2650 // below for operand 1
2651 writeOperandWithCast(I.getOperand(0), I);
2653 switch (I.getPredicate()) {
2654 case ICmpInst::ICMP_EQ: Out << " == "; break;
2655 case ICmpInst::ICMP_NE: Out << " != "; break;
2656 case ICmpInst::ICMP_ULE:
2657 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2658 case ICmpInst::ICMP_UGE:
2659 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2660 case ICmpInst::ICMP_ULT:
2661 case ICmpInst::ICMP_SLT: Out << " < "; break;
2662 case ICmpInst::ICMP_UGT:
2663 case ICmpInst::ICMP_SGT: Out << " > "; break;
2666 errs() << "Invalid icmp predicate!" << I;
2668 llvm_unreachable(0);
2671 writeOperandWithCast(I.getOperand(1), I);
2672 if (NeedsClosingParens)
2680 void CWriter::visitFCmpInst(FCmpInst &I) {
2681 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2685 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2691 switch (I.getPredicate()) {
2692 default: llvm_unreachable("Illegal FCmp predicate");
2693 case FCmpInst::FCMP_ORD: op = "ord"; break;
2694 case FCmpInst::FCMP_UNO: op = "uno"; break;
2695 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2696 case FCmpInst::FCMP_UNE: op = "une"; break;
2697 case FCmpInst::FCMP_ULT: op = "ult"; break;
2698 case FCmpInst::FCMP_ULE: op = "ule"; break;
2699 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2700 case FCmpInst::FCMP_UGE: op = "uge"; break;
2701 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2702 case FCmpInst::FCMP_ONE: op = "one"; break;
2703 case FCmpInst::FCMP_OLT: op = "olt"; break;
2704 case FCmpInst::FCMP_OLE: op = "ole"; break;
2705 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2706 case FCmpInst::FCMP_OGE: op = "oge"; break;
2709 Out << "llvm_fcmp_" << op << "(";
2710 // Write the first operand
2711 writeOperand(I.getOperand(0));
2713 // Write the second operand
2714 writeOperand(I.getOperand(1));
2718 static const char * getFloatBitCastField(const Type *Ty) {
2719 switch (Ty->getTypeID()) {
2720 default: llvm_unreachable("Invalid Type");
2721 case Type::FloatTyID: return "Float";
2722 case Type::DoubleTyID: return "Double";
2723 case Type::IntegerTyID: {
2724 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2733 void CWriter::visitCastInst(CastInst &I) {
2734 const Type *DstTy = I.getType();
2735 const Type *SrcTy = I.getOperand(0)->getType();
2736 if (isFPIntBitCast(I)) {
2738 // These int<->float and long<->double casts need to be handled specially
2739 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2740 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2741 writeOperand(I.getOperand(0));
2742 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2743 << getFloatBitCastField(I.getType());
2749 printCast(I.getOpcode(), SrcTy, DstTy);
2751 // Make a sext from i1 work by subtracting the i1 from 0 (an int).
2752 if (SrcTy == Type::getInt1Ty(I.getContext()) &&
2753 I.getOpcode() == Instruction::SExt)
2756 writeOperand(I.getOperand(0));
2758 if (DstTy == Type::getInt1Ty(I.getContext()) &&
2759 (I.getOpcode() == Instruction::Trunc ||
2760 I.getOpcode() == Instruction::FPToUI ||
2761 I.getOpcode() == Instruction::FPToSI ||
2762 I.getOpcode() == Instruction::PtrToInt)) {
2763 // Make sure we really get a trunc to bool by anding the operand with 1
2769 void CWriter::visitSelectInst(SelectInst &I) {
2771 writeOperand(I.getCondition());
2773 writeOperand(I.getTrueValue());
2775 writeOperand(I.getFalseValue());
2780 void CWriter::lowerIntrinsics(Function &F) {
2781 // This is used to keep track of intrinsics that get generated to a lowered
2782 // function. We must generate the prototypes before the function body which
2783 // will only be expanded on first use (by the loop below).
2784 std::vector<Function*> prototypesToGen;
2786 // Examine all the instructions in this function to find the intrinsics that
2787 // need to be lowered.
2788 for (Function::iterator BB = F.begin(), EE = F.end(); BB != EE; ++BB)
2789 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2790 if (CallInst *CI = dyn_cast<CallInst>(I++))
2791 if (Function *F = CI->getCalledFunction())
2792 switch (F->getIntrinsicID()) {
2793 case Intrinsic::not_intrinsic:
2794 case Intrinsic::memory_barrier:
2795 case Intrinsic::vastart:
2796 case Intrinsic::vacopy:
2797 case Intrinsic::vaend:
2798 case Intrinsic::returnaddress:
2799 case Intrinsic::frameaddress:
2800 case Intrinsic::setjmp:
2801 case Intrinsic::longjmp:
2802 case Intrinsic::prefetch:
2803 case Intrinsic::powi:
2804 case Intrinsic::x86_sse_cmp_ss:
2805 case Intrinsic::x86_sse_cmp_ps:
2806 case Intrinsic::x86_sse2_cmp_sd:
2807 case Intrinsic::x86_sse2_cmp_pd:
2808 case Intrinsic::ppc_altivec_lvsl:
2809 // We directly implement these intrinsics
2812 // If this is an intrinsic that directly corresponds to a GCC
2813 // builtin, we handle it.
2814 const char *BuiltinName = "";
2815 #define GET_GCC_BUILTIN_NAME
2816 #include "llvm/Intrinsics.gen"
2817 #undef GET_GCC_BUILTIN_NAME
2818 // If we handle it, don't lower it.
2819 if (BuiltinName[0]) break;
2821 // All other intrinsic calls we must lower.
2822 Instruction *Before = 0;
2823 if (CI != &BB->front())
2824 Before = prior(BasicBlock::iterator(CI));
2826 IL->LowerIntrinsicCall(CI);
2827 if (Before) { // Move iterator to instruction after call
2832 // If the intrinsic got lowered to another call, and that call has
2833 // a definition then we need to make sure its prototype is emitted
2834 // before any calls to it.
2835 if (CallInst *Call = dyn_cast<CallInst>(I))
2836 if (Function *NewF = Call->getCalledFunction())
2837 if (!NewF->isDeclaration())
2838 prototypesToGen.push_back(NewF);
2843 // We may have collected some prototypes to emit in the loop above.
2844 // Emit them now, before the function that uses them is emitted. But,
2845 // be careful not to emit them twice.
2846 std::vector<Function*>::iterator I = prototypesToGen.begin();
2847 std::vector<Function*>::iterator E = prototypesToGen.end();
2848 for ( ; I != E; ++I) {
2849 if (intrinsicPrototypesAlreadyGenerated.insert(*I).second) {
2851 printFunctionSignature(*I, true);
2857 void CWriter::visitCallInst(CallInst &I) {
2858 if (isa<InlineAsm>(I.getOperand(0)))
2859 return visitInlineAsm(I);
2861 bool WroteCallee = false;
2863 // Handle intrinsic function calls first...
2864 if (Function *F = I.getCalledFunction())
2865 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
2866 if (visitBuiltinCall(I, ID, WroteCallee))
2869 Value *Callee = I.getCalledValue();
2871 const PointerType *PTy = cast<PointerType>(Callee->getType());
2872 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2874 // If this is a call to a struct-return function, assign to the first
2875 // parameter instead of passing it to the call.
2876 const AttrListPtr &PAL = I.getAttributes();
2877 bool hasByVal = I.hasByValArgument();
2878 bool isStructRet = I.hasStructRetAttr();
2880 writeOperandDeref(I.getOperand(1));
2884 if (I.isTailCall()) Out << " /*tail*/ ";
2887 // If this is an indirect call to a struct return function, we need to cast
2888 // the pointer. Ditto for indirect calls with byval arguments.
2889 bool NeedsCast = (hasByVal || isStructRet) && !isa<Function>(Callee);
2891 // GCC is a real PITA. It does not permit codegening casts of functions to
2892 // function pointers if they are in a call (it generates a trap instruction
2893 // instead!). We work around this by inserting a cast to void* in between
2894 // the function and the function pointer cast. Unfortunately, we can't just
2895 // form the constant expression here, because the folder will immediately
2898 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2899 // that void* and function pointers have the same size. :( To deal with this
2900 // in the common case, we handle casts where the number of arguments passed
2903 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2905 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2911 // Ok, just cast the pointer type.
2914 printStructReturnPointerFunctionType(Out, PAL,
2915 cast<PointerType>(I.getCalledValue()->getType()));
2917 printType(Out, I.getCalledValue()->getType(), false, "", true, PAL);
2919 printType(Out, I.getCalledValue()->getType());
2922 writeOperand(Callee);
2923 if (NeedsCast) Out << ')';
2928 unsigned NumDeclaredParams = FTy->getNumParams();
2930 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2932 if (isStructRet) { // Skip struct return argument.
2937 bool PrintedArg = false;
2938 for (; AI != AE; ++AI, ++ArgNo) {
2939 if (PrintedArg) Out << ", ";
2940 if (ArgNo < NumDeclaredParams &&
2941 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2943 printType(Out, FTy->getParamType(ArgNo),
2944 /*isSigned=*/PAL.paramHasAttr(ArgNo+1, Attribute::SExt));
2947 // Check if the argument is expected to be passed by value.
2948 if (I.paramHasAttr(ArgNo+1, Attribute::ByVal))
2949 writeOperandDeref(*AI);
2957 /// visitBuiltinCall - Handle the call to the specified builtin. Returns true
2958 /// if the entire call is handled, return false if it wasn't handled, and
2959 /// optionally set 'WroteCallee' if the callee has already been printed out.
2960 bool CWriter::visitBuiltinCall(CallInst &I, Intrinsic::ID ID,
2961 bool &WroteCallee) {
2964 // If this is an intrinsic that directly corresponds to a GCC
2965 // builtin, we emit it here.
2966 const char *BuiltinName = "";
2967 Function *F = I.getCalledFunction();
2968 #define GET_GCC_BUILTIN_NAME
2969 #include "llvm/Intrinsics.gen"
2970 #undef GET_GCC_BUILTIN_NAME
2971 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2977 case Intrinsic::memory_barrier:
2978 Out << "__sync_synchronize()";
2980 case Intrinsic::vastart:
2983 Out << "va_start(*(va_list*)";
2984 writeOperand(I.getOperand(1));
2986 // Output the last argument to the enclosing function.
2987 if (I.getParent()->getParent()->arg_empty()) {
2989 raw_string_ostream Msg(msg);
2990 Msg << "The C backend does not currently support zero "
2991 << "argument varargs functions, such as '"
2992 << I.getParent()->getParent()->getName() << "'!";
2993 llvm_report_error(Msg.str());
2995 writeOperand(--I.getParent()->getParent()->arg_end());
2998 case Intrinsic::vaend:
2999 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
3000 Out << "0; va_end(*(va_list*)";
3001 writeOperand(I.getOperand(1));
3004 Out << "va_end(*(va_list*)0)";
3007 case Intrinsic::vacopy:
3009 Out << "va_copy(*(va_list*)";
3010 writeOperand(I.getOperand(1));
3011 Out << ", *(va_list*)";
3012 writeOperand(I.getOperand(2));
3015 case Intrinsic::returnaddress:
3016 Out << "__builtin_return_address(";
3017 writeOperand(I.getOperand(1));
3020 case Intrinsic::frameaddress:
3021 Out << "__builtin_frame_address(";
3022 writeOperand(I.getOperand(1));
3025 case Intrinsic::powi:
3026 Out << "__builtin_powi(";
3027 writeOperand(I.getOperand(1));
3029 writeOperand(I.getOperand(2));
3032 case Intrinsic::setjmp:
3033 Out << "setjmp(*(jmp_buf*)";
3034 writeOperand(I.getOperand(1));
3037 case Intrinsic::longjmp:
3038 Out << "longjmp(*(jmp_buf*)";
3039 writeOperand(I.getOperand(1));
3041 writeOperand(I.getOperand(2));
3044 case Intrinsic::prefetch:
3045 Out << "LLVM_PREFETCH((const void *)";
3046 writeOperand(I.getOperand(1));
3048 writeOperand(I.getOperand(2));
3050 writeOperand(I.getOperand(3));
3053 case Intrinsic::stacksave:
3054 // Emit this as: Val = 0; *((void**)&Val) = __builtin_stack_save()
3055 // to work around GCC bugs (see PR1809).
3056 Out << "0; *((void**)&" << GetValueName(&I)
3057 << ") = __builtin_stack_save()";
3059 case Intrinsic::x86_sse_cmp_ss:
3060 case Intrinsic::x86_sse_cmp_ps:
3061 case Intrinsic::x86_sse2_cmp_sd:
3062 case Intrinsic::x86_sse2_cmp_pd:
3064 printType(Out, I.getType());
3066 // Multiple GCC builtins multiplex onto this intrinsic.
3067 switch (cast<ConstantInt>(I.getOperand(3))->getZExtValue()) {
3068 default: llvm_unreachable("Invalid llvm.x86.sse.cmp!");
3069 case 0: Out << "__builtin_ia32_cmpeq"; break;
3070 case 1: Out << "__builtin_ia32_cmplt"; break;
3071 case 2: Out << "__builtin_ia32_cmple"; break;
3072 case 3: Out << "__builtin_ia32_cmpunord"; break;
3073 case 4: Out << "__builtin_ia32_cmpneq"; break;
3074 case 5: Out << "__builtin_ia32_cmpnlt"; break;
3075 case 6: Out << "__builtin_ia32_cmpnle"; break;
3076 case 7: Out << "__builtin_ia32_cmpord"; break;
3078 if (ID == Intrinsic::x86_sse_cmp_ps || ID == Intrinsic::x86_sse2_cmp_pd)
3082 if (ID == Intrinsic::x86_sse_cmp_ss || ID == Intrinsic::x86_sse_cmp_ps)
3088 writeOperand(I.getOperand(1));
3090 writeOperand(I.getOperand(2));
3093 case Intrinsic::ppc_altivec_lvsl:
3095 printType(Out, I.getType());
3097 Out << "__builtin_altivec_lvsl(0, (void*)";
3098 writeOperand(I.getOperand(1));
3104 //This converts the llvm constraint string to something gcc is expecting.
3105 //TODO: work out platform independent constraints and factor those out
3106 // of the per target tables
3107 // handle multiple constraint codes
3108 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
3109 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
3111 // Grab the translation table from MCAsmInfo if it exists.
3112 const MCAsmInfo *TargetAsm;
3113 std::string Triple = TheModule->getTargetTriple();
3115 Triple = llvm::sys::getHostTriple();
3118 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
3119 TargetAsm = Match->createAsmInfo(Triple);
3123 const char *const *table = TargetAsm->getAsmCBE();
3125 // Search the translation table if it exists.
3126 for (int i = 0; table && table[i]; i += 2)
3127 if (c.Codes[0] == table[i]) {
3132 // Default is identity.
3137 //TODO: import logic from AsmPrinter.cpp
3138 static std::string gccifyAsm(std::string asmstr) {
3139 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
3140 if (asmstr[i] == '\n')
3141 asmstr.replace(i, 1, "\\n");
3142 else if (asmstr[i] == '\t')
3143 asmstr.replace(i, 1, "\\t");
3144 else if (asmstr[i] == '$') {
3145 if (asmstr[i + 1] == '{') {
3146 std::string::size_type a = asmstr.find_first_of(':', i + 1);
3147 std::string::size_type b = asmstr.find_first_of('}', i + 1);
3148 std::string n = "%" +
3149 asmstr.substr(a + 1, b - a - 1) +
3150 asmstr.substr(i + 2, a - i - 2);
3151 asmstr.replace(i, b - i + 1, n);
3154 asmstr.replace(i, 1, "%");
3156 else if (asmstr[i] == '%')//grr
3157 { asmstr.replace(i, 1, "%%"); ++i;}
3162 //TODO: assumptions about what consume arguments from the call are likely wrong
3163 // handle communitivity
3164 void CWriter::visitInlineAsm(CallInst &CI) {
3165 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
3166 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
3168 std::vector<std::pair<Value*, int> > ResultVals;
3169 if (CI.getType() == Type::getVoidTy(CI.getContext()))
3171 else if (const StructType *ST = dyn_cast<StructType>(CI.getType())) {
3172 for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i)
3173 ResultVals.push_back(std::make_pair(&CI, (int)i));
3175 ResultVals.push_back(std::make_pair(&CI, -1));
3178 // Fix up the asm string for gcc and emit it.
3179 Out << "__asm__ volatile (\"" << gccifyAsm(as->getAsmString()) << "\"\n";
3182 unsigned ValueCount = 0;
3183 bool IsFirst = true;
3185 // Convert over all the output constraints.
3186 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3187 E = Constraints.end(); I != E; ++I) {
3189 if (I->Type != InlineAsm::isOutput) {
3191 continue; // Ignore non-output constraints.
3194 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3195 std::string C = InterpretASMConstraint(*I);
3196 if (C.empty()) continue;
3207 if (ValueCount < ResultVals.size()) {
3208 DestVal = ResultVals[ValueCount].first;
3209 DestValNo = ResultVals[ValueCount].second;
3211 DestVal = CI.getOperand(ValueCount-ResultVals.size()+1);
3213 if (I->isEarlyClobber)
3216 Out << "\"=" << C << "\"(" << GetValueName(DestVal);
3217 if (DestValNo != -1)
3218 Out << ".field" << DestValNo; // Multiple retvals.
3224 // Convert over all the input constraints.
3228 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3229 E = Constraints.end(); I != E; ++I) {
3230 if (I->Type != InlineAsm::isInput) {
3232 continue; // Ignore non-input constraints.
3235 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3236 std::string C = InterpretASMConstraint(*I);
3237 if (C.empty()) continue;
3244 assert(ValueCount >= ResultVals.size() && "Input can't refer to result");
3245 Value *SrcVal = CI.getOperand(ValueCount-ResultVals.size()+1);
3247 Out << "\"" << C << "\"(";
3249 writeOperand(SrcVal);
3251 writeOperandDeref(SrcVal);
3255 // Convert over the clobber constraints.
3257 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3258 E = Constraints.end(); I != E; ++I) {
3259 if (I->Type != InlineAsm::isClobber)
3260 continue; // Ignore non-input constraints.
3262 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3263 std::string C = InterpretASMConstraint(*I);
3264 if (C.empty()) continue;
3271 Out << '\"' << C << '"';
3277 void CWriter::visitAllocaInst(AllocaInst &I) {
3279 printType(Out, I.getType());
3280 Out << ") alloca(sizeof(";
3281 printType(Out, I.getType()->getElementType());
3283 if (I.isArrayAllocation()) {
3285 writeOperand(I.getOperand(0));
3290 void CWriter::printGEPExpression(Value *Ptr, gep_type_iterator I,
3291 gep_type_iterator E, bool Static) {
3293 // If there are no indices, just print out the pointer.
3299 // Find out if the last index is into a vector. If so, we have to print this
3300 // specially. Since vectors can't have elements of indexable type, only the
3301 // last index could possibly be of a vector element.
3302 const VectorType *LastIndexIsVector = 0;
3304 for (gep_type_iterator TmpI = I; TmpI != E; ++TmpI)
3305 LastIndexIsVector = dyn_cast<VectorType>(*TmpI);
3310 // If the last index is into a vector, we can't print it as &a[i][j] because
3311 // we can't index into a vector with j in GCC. Instead, emit this as
3312 // (((float*)&a[i])+j)
3313 if (LastIndexIsVector) {
3315 printType(Out, PointerType::getUnqual(LastIndexIsVector->getElementType()));
3321 // If the first index is 0 (very typical) we can do a number of
3322 // simplifications to clean up the code.
3323 Value *FirstOp = I.getOperand();
3324 if (!isa<Constant>(FirstOp) || !cast<Constant>(FirstOp)->isNullValue()) {
3325 // First index isn't simple, print it the hard way.
3328 ++I; // Skip the zero index.
3330 // Okay, emit the first operand. If Ptr is something that is already address
3331 // exposed, like a global, avoid emitting (&foo)[0], just emit foo instead.
3332 if (isAddressExposed(Ptr)) {
3333 writeOperandInternal(Ptr, Static);
3334 } else if (I != E && (*I)->isStructTy()) {
3335 // If we didn't already emit the first operand, see if we can print it as
3336 // P->f instead of "P[0].f"
3338 Out << "->field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3339 ++I; // eat the struct index as well.
3341 // Instead of emitting P[0][1], emit (*P)[1], which is more idiomatic.
3348 for (; I != E; ++I) {
3349 if ((*I)->isStructTy()) {
3350 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3351 } else if ((*I)->isArrayTy()) {
3353 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3355 } else if (!(*I)->isVectorTy()) {
3357 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3360 // If the last index is into a vector, then print it out as "+j)". This
3361 // works with the 'LastIndexIsVector' code above.
3362 if (isa<Constant>(I.getOperand()) &&
3363 cast<Constant>(I.getOperand())->isNullValue()) {
3364 Out << "))"; // avoid "+0".
3367 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3375 void CWriter::writeMemoryAccess(Value *Operand, const Type *OperandType,
3376 bool IsVolatile, unsigned Alignment) {
3378 bool IsUnaligned = Alignment &&
3379 Alignment < TD->getABITypeAlignment(OperandType);
3383 if (IsVolatile || IsUnaligned) {
3386 Out << "struct __attribute__ ((packed, aligned(" << Alignment << "))) {";
3387 printType(Out, OperandType, false, IsUnaligned ? "data" : "volatile*");
3390 if (IsVolatile) Out << "volatile ";
3396 writeOperand(Operand);
3398 if (IsVolatile || IsUnaligned) {
3405 void CWriter::visitLoadInst(LoadInst &I) {
3406 writeMemoryAccess(I.getOperand(0), I.getType(), I.isVolatile(),
3411 void CWriter::visitStoreInst(StoreInst &I) {
3412 writeMemoryAccess(I.getPointerOperand(), I.getOperand(0)->getType(),
3413 I.isVolatile(), I.getAlignment());
3415 Value *Operand = I.getOperand(0);
3416 Constant *BitMask = 0;
3417 if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
3418 if (!ITy->isPowerOf2ByteWidth())
3419 // We have a bit width that doesn't match an even power-of-2 byte
3420 // size. Consequently we must & the value with the type's bit mask
3421 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
3424 writeOperand(Operand);
3427 printConstant(BitMask, false);
3432 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
3433 printGEPExpression(I.getPointerOperand(), gep_type_begin(I),
3434 gep_type_end(I), false);
3437 void CWriter::visitVAArgInst(VAArgInst &I) {
3438 Out << "va_arg(*(va_list*)";
3439 writeOperand(I.getOperand(0));
3441 printType(Out, I.getType());
3445 void CWriter::visitInsertElementInst(InsertElementInst &I) {
3446 const Type *EltTy = I.getType()->getElementType();
3447 writeOperand(I.getOperand(0));
3450 printType(Out, PointerType::getUnqual(EltTy));
3451 Out << ")(&" << GetValueName(&I) << "))[";
3452 writeOperand(I.getOperand(2));
3454 writeOperand(I.getOperand(1));
3458 void CWriter::visitExtractElementInst(ExtractElementInst &I) {
3459 // We know that our operand is not inlined.
3462 cast<VectorType>(I.getOperand(0)->getType())->getElementType();
3463 printType(Out, PointerType::getUnqual(EltTy));
3464 Out << ")(&" << GetValueName(I.getOperand(0)) << "))[";
3465 writeOperand(I.getOperand(1));
3469 void CWriter::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
3471 printType(Out, SVI.getType());
3473 const VectorType *VT = SVI.getType();
3474 unsigned NumElts = VT->getNumElements();
3475 const Type *EltTy = VT->getElementType();
3477 for (unsigned i = 0; i != NumElts; ++i) {
3479 int SrcVal = SVI.getMaskValue(i);
3480 if ((unsigned)SrcVal >= NumElts*2) {
3481 Out << " 0/*undef*/ ";
3483 Value *Op = SVI.getOperand((unsigned)SrcVal >= NumElts);
3484 if (isa<Instruction>(Op)) {
3485 // Do an extractelement of this value from the appropriate input.
3487 printType(Out, PointerType::getUnqual(EltTy));
3488 Out << ")(&" << GetValueName(Op)
3489 << "))[" << (SrcVal & (NumElts-1)) << "]";
3490 } else if (isa<ConstantAggregateZero>(Op) || isa<UndefValue>(Op)) {
3493 printConstant(cast<ConstantVector>(Op)->getOperand(SrcVal &
3502 void CWriter::visitInsertValueInst(InsertValueInst &IVI) {
3503 // Start by copying the entire aggregate value into the result variable.
3504 writeOperand(IVI.getOperand(0));
3507 // Then do the insert to update the field.
3508 Out << GetValueName(&IVI);
3509 for (const unsigned *b = IVI.idx_begin(), *i = b, *e = IVI.idx_end();
3511 const Type *IndexedTy =
3512 ExtractValueInst::getIndexedType(IVI.getOperand(0)->getType(), b, i+1);
3513 if (IndexedTy->isArrayTy())
3514 Out << ".array[" << *i << "]";
3516 Out << ".field" << *i;
3519 writeOperand(IVI.getOperand(1));
3522 void CWriter::visitExtractValueInst(ExtractValueInst &EVI) {
3524 if (isa<UndefValue>(EVI.getOperand(0))) {
3526 printType(Out, EVI.getType());
3527 Out << ") 0/*UNDEF*/";
3529 Out << GetValueName(EVI.getOperand(0));
3530 for (const unsigned *b = EVI.idx_begin(), *i = b, *e = EVI.idx_end();
3532 const Type *IndexedTy =
3533 ExtractValueInst::getIndexedType(EVI.getOperand(0)->getType(), b, i+1);
3534 if (IndexedTy->isArrayTy())
3535 Out << ".array[" << *i << "]";
3537 Out << ".field" << *i;
3543 //===----------------------------------------------------------------------===//
3544 // External Interface declaration
3545 //===----------------------------------------------------------------------===//
3547 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
3548 formatted_raw_ostream &o,
3549 CodeGenFileType FileType,
3550 CodeGenOpt::Level OptLevel,
3551 bool DisableVerify) {
3552 if (FileType != TargetMachine::CGFT_AssemblyFile) return true;
3554 PM.add(createGCLoweringPass());
3555 PM.add(createLowerInvokePass());
3556 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
3557 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
3558 PM.add(new CWriter(o));
3559 PM.add(createGCInfoDeleter());