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), TCtx(0), TD(0), OpaqueCounter(0),
115 NextAnonValueNumber(0) {
119 virtual const char *getPassName() const { return "C backend"; }
121 void getAnalysisUsage(AnalysisUsage &AU) const {
122 AU.addRequired<LoopInfo>();
123 AU.setPreservesAll();
126 virtual bool doInitialization(Module &M);
128 bool runOnFunction(Function &F) {
129 // Do not codegen any 'available_externally' functions at all, they have
130 // definitions outside the translation unit.
131 if (F.hasAvailableExternallyLinkage())
134 LI = &getAnalysis<LoopInfo>();
136 // Get rid of intrinsics we can't handle.
139 // Output all floating point constants that cannot be printed accurately.
140 printFloatingPointConstants(F);
146 virtual bool doFinalization(Module &M) {
153 FPConstantMap.clear();
156 intrinsicPrototypesAlreadyGenerated.clear();
160 raw_ostream &printType(raw_ostream &Out, const Type *Ty,
161 bool isSigned = false,
162 const std::string &VariableName = "",
163 bool IgnoreName = false,
164 const AttrListPtr &PAL = AttrListPtr());
165 raw_ostream &printSimpleType(raw_ostream &Out, const Type *Ty,
167 const std::string &NameSoFar = "");
169 void printStructReturnPointerFunctionType(raw_ostream &Out,
170 const AttrListPtr &PAL,
171 const PointerType *Ty);
173 /// writeOperandDeref - Print the result of dereferencing the specified
174 /// operand with '*'. This is equivalent to printing '*' then using
175 /// writeOperand, but avoids excess syntax in some cases.
176 void writeOperandDeref(Value *Operand) {
177 if (isAddressExposed(Operand)) {
178 // Already something with an address exposed.
179 writeOperandInternal(Operand);
182 writeOperand(Operand);
187 void writeOperand(Value *Operand, bool Static = false);
188 void writeInstComputationInline(Instruction &I);
189 void writeOperandInternal(Value *Operand, bool Static = false);
190 void writeOperandWithCast(Value* Operand, unsigned Opcode);
191 void writeOperandWithCast(Value* Operand, const ICmpInst &I);
192 bool writeInstructionCast(const Instruction &I);
194 void writeMemoryAccess(Value *Operand, const Type *OperandType,
195 bool IsVolatile, unsigned Alignment);
198 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
200 void lowerIntrinsics(Function &F);
202 void printModuleTypes(const TypeSymbolTable &ST);
203 void printContainedStructs(const Type *Ty, std::set<const Type *> &);
204 void printFloatingPointConstants(Function &F);
205 void printFloatingPointConstants(const Constant *C);
206 void printFunctionSignature(const Function *F, bool Prototype);
208 void printFunction(Function &);
209 void printBasicBlock(BasicBlock *BB);
210 void printLoop(Loop *L);
212 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
213 void printConstant(Constant *CPV, bool Static);
214 void printConstantWithCast(Constant *CPV, unsigned Opcode);
215 bool printConstExprCast(const ConstantExpr *CE, bool Static);
216 void printConstantArray(ConstantArray *CPA, bool Static);
217 void printConstantVector(ConstantVector *CV, bool Static);
219 /// isAddressExposed - Return true if the specified value's name needs to
220 /// have its address taken in order to get a C value of the correct type.
221 /// This happens for global variables, byval parameters, and direct allocas.
222 bool isAddressExposed(const Value *V) const {
223 if (const Argument *A = dyn_cast<Argument>(V))
224 return ByValParams.count(A);
225 return isa<GlobalVariable>(V) || isDirectAlloca(V);
228 // isInlinableInst - Attempt to inline instructions into their uses to build
229 // trees as much as possible. To do this, we have to consistently decide
230 // what is acceptable to inline, so that variable declarations don't get
231 // printed and an extra copy of the expr is not emitted.
233 static bool isInlinableInst(const Instruction &I) {
234 // Always inline cmp instructions, even if they are shared by multiple
235 // expressions. GCC generates horrible code if we don't.
239 // Must be an expression, must be used exactly once. If it is dead, we
240 // emit it inline where it would go.
241 if (I.getType() == Type::getVoidTy(I.getContext()) || !I.hasOneUse() ||
242 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
243 isa<LoadInst>(I) || isa<VAArgInst>(I) || isa<InsertElementInst>(I) ||
244 isa<InsertValueInst>(I))
245 // Don't inline a load across a store or other bad things!
248 // Must not be used in inline asm, extractelement, or shufflevector.
250 const Instruction &User = cast<Instruction>(*I.use_back());
251 if (isInlineAsm(User) || isa<ExtractElementInst>(User) ||
252 isa<ShuffleVectorInst>(User))
256 // Only inline instruction it if it's use is in the same BB as the inst.
257 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
260 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
261 // variables which are accessed with the & operator. This causes GCC to
262 // generate significantly better code than to emit alloca calls directly.
264 static const AllocaInst *isDirectAlloca(const Value *V) {
265 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
267 if (AI->isArrayAllocation())
268 return 0; // FIXME: we can also inline fixed size array allocas!
269 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
274 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
275 static bool isInlineAsm(const Instruction& I) {
276 if (const CallInst *CI = dyn_cast<CallInst>(&I))
277 return isa<InlineAsm>(CI->getCalledValue());
281 // Instruction visitation functions
282 friend class InstVisitor<CWriter>;
284 void visitReturnInst(ReturnInst &I);
285 void visitBranchInst(BranchInst &I);
286 void visitSwitchInst(SwitchInst &I);
287 void visitIndirectBrInst(IndirectBrInst &I);
288 void visitInvokeInst(InvokeInst &I) {
289 llvm_unreachable("Lowerinvoke pass didn't work!");
292 void visitUnwindInst(UnwindInst &I) {
293 llvm_unreachable("Lowerinvoke pass didn't work!");
295 void visitUnreachableInst(UnreachableInst &I);
297 void visitPHINode(PHINode &I);
298 void visitBinaryOperator(Instruction &I);
299 void visitICmpInst(ICmpInst &I);
300 void visitFCmpInst(FCmpInst &I);
302 void visitCastInst (CastInst &I);
303 void visitSelectInst(SelectInst &I);
304 void visitCallInst (CallInst &I);
305 void visitInlineAsm(CallInst &I);
306 bool visitBuiltinCall(CallInst &I, Intrinsic::ID ID, bool &WroteCallee);
308 void visitAllocaInst(AllocaInst &I);
309 void visitLoadInst (LoadInst &I);
310 void visitStoreInst (StoreInst &I);
311 void visitGetElementPtrInst(GetElementPtrInst &I);
312 void visitVAArgInst (VAArgInst &I);
314 void visitInsertElementInst(InsertElementInst &I);
315 void visitExtractElementInst(ExtractElementInst &I);
316 void visitShuffleVectorInst(ShuffleVectorInst &SVI);
318 void visitInsertValueInst(InsertValueInst &I);
319 void visitExtractValueInst(ExtractValueInst &I);
321 void visitInstruction(Instruction &I) {
323 errs() << "C Writer does not know about " << I;
328 void outputLValue(Instruction *I) {
329 Out << " " << GetValueName(I) << " = ";
332 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
333 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
334 BasicBlock *Successor, unsigned Indent);
335 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
337 void printGEPExpression(Value *Ptr, gep_type_iterator I,
338 gep_type_iterator E, bool Static);
340 std::string GetValueName(const Value *Operand);
344 char CWriter::ID = 0;
347 static std::string CBEMangle(const std::string &S) {
350 for (unsigned i = 0, e = S.size(); i != e; ++i)
351 if (isalnum(S[i]) || S[i] == '_') {
355 Result += 'A'+(S[i]&15);
356 Result += 'A'+((S[i]>>4)&15);
363 /// This method inserts names for any unnamed structure types that are used by
364 /// the program, and removes names from structure types that are not used by the
367 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
368 // Get a set of types that are used by the program...
369 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
371 // Loop over the module symbol table, removing types from UT that are
372 // already named, and removing names for types that are not used.
374 TypeSymbolTable &TST = M.getTypeSymbolTable();
375 for (TypeSymbolTable::iterator TI = TST.begin(), TE = TST.end();
377 TypeSymbolTable::iterator I = TI++;
379 // If this isn't a struct or array type, remove it from our set of types
380 // to name. This simplifies emission later.
381 if (!I->second->isStructTy() && !I->second->isOpaqueTy() &&
382 !I->second->isArrayTy()) {
385 // If this is not used, remove it from the symbol table.
386 std::set<const Type *>::iterator UTI = UT.find(I->second);
390 UT.erase(UTI); // Only keep one name for this type.
394 // UT now contains types that are not named. Loop over it, naming
397 bool Changed = false;
398 unsigned RenameCounter = 0;
399 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
401 if ((*I)->isStructTy() || (*I)->isArrayTy()) {
402 while (M.addTypeName("unnamed"+utostr(RenameCounter), *I))
408 // Loop over all external functions and globals. If we have two with
409 // identical names, merge them.
410 // FIXME: This code should disappear when we don't allow values with the same
411 // names when they have different types!
412 std::map<std::string, GlobalValue*> ExtSymbols;
413 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
415 if (GV->isDeclaration() && GV->hasName()) {
416 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
417 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
419 // Found a conflict, replace this global with the previous one.
420 GlobalValue *OldGV = X.first->second;
421 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
422 GV->eraseFromParent();
427 // Do the same for globals.
428 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
430 GlobalVariable *GV = I++;
431 if (GV->isDeclaration() && GV->hasName()) {
432 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
433 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
435 // Found a conflict, replace this global with the previous one.
436 GlobalValue *OldGV = X.first->second;
437 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
438 GV->eraseFromParent();
447 /// printStructReturnPointerFunctionType - This is like printType for a struct
448 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
449 /// print it as "Struct (*)(...)", for struct return functions.
450 void CWriter::printStructReturnPointerFunctionType(raw_ostream &Out,
451 const AttrListPtr &PAL,
452 const PointerType *TheTy) {
453 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
455 raw_string_ostream FunctionInnards(tstr);
456 FunctionInnards << " (*) (";
457 bool PrintedType = false;
459 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
460 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
462 for (++I, ++Idx; I != E; ++I, ++Idx) {
464 FunctionInnards << ", ";
465 const Type *ArgTy = *I;
466 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
467 assert(ArgTy->isPointerTy());
468 ArgTy = cast<PointerType>(ArgTy)->getElementType();
470 printType(FunctionInnards, ArgTy,
471 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
474 if (FTy->isVarArg()) {
476 FunctionInnards << " int"; //dummy argument for empty vararg functs
477 FunctionInnards << ", ...";
478 } else if (!PrintedType) {
479 FunctionInnards << "void";
481 FunctionInnards << ')';
482 printType(Out, RetTy,
483 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
487 CWriter::printSimpleType(raw_ostream &Out, const Type *Ty, bool isSigned,
488 const std::string &NameSoFar) {
489 assert((Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) &&
490 "Invalid type for printSimpleType");
491 switch (Ty->getTypeID()) {
492 case Type::VoidTyID: return Out << "void " << NameSoFar;
493 case Type::IntegerTyID: {
494 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
496 return Out << "bool " << NameSoFar;
497 else if (NumBits <= 8)
498 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
499 else if (NumBits <= 16)
500 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
501 else if (NumBits <= 32)
502 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
503 else if (NumBits <= 64)
504 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
506 assert(NumBits <= 128 && "Bit widths > 128 not implemented yet");
507 return Out << (isSigned?"llvmInt128":"llvmUInt128") << " " << NameSoFar;
510 case Type::FloatTyID: return Out << "float " << NameSoFar;
511 case Type::DoubleTyID: return Out << "double " << NameSoFar;
512 // Lacking emulation of FP80 on PPC, etc., we assume whichever of these is
513 // present matches host 'long double'.
514 case Type::X86_FP80TyID:
515 case Type::PPC_FP128TyID:
516 case Type::FP128TyID: return Out << "long double " << NameSoFar;
518 case Type::X86_MMXTyID:
519 return printSimpleType(Out, Type::getInt32Ty(Ty->getContext()), isSigned,
520 " __attribute__((vector_size(64))) " + NameSoFar);
522 case Type::VectorTyID: {
523 const VectorType *VTy = cast<VectorType>(Ty);
524 return printSimpleType(Out, VTy->getElementType(), isSigned,
525 " __attribute__((vector_size(" +
526 utostr(TD->getTypeAllocSize(VTy)) + " ))) " + NameSoFar);
531 errs() << "Unknown primitive type: " << *Ty << "\n";
537 // Pass the Type* and the variable name and this prints out the variable
540 raw_ostream &CWriter::printType(raw_ostream &Out, const Type *Ty,
541 bool isSigned, const std::string &NameSoFar,
542 bool IgnoreName, const AttrListPtr &PAL) {
543 if (Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) {
544 printSimpleType(Out, Ty, isSigned, NameSoFar);
548 // Check to see if the type is named.
549 if (!IgnoreName || Ty->isOpaqueTy()) {
550 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
551 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
554 switch (Ty->getTypeID()) {
555 case Type::FunctionTyID: {
556 const FunctionType *FTy = cast<FunctionType>(Ty);
558 raw_string_ostream FunctionInnards(tstr);
559 FunctionInnards << " (" << NameSoFar << ") (";
561 for (FunctionType::param_iterator I = FTy->param_begin(),
562 E = FTy->param_end(); I != E; ++I) {
563 const Type *ArgTy = *I;
564 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
565 assert(ArgTy->isPointerTy());
566 ArgTy = cast<PointerType>(ArgTy)->getElementType();
568 if (I != FTy->param_begin())
569 FunctionInnards << ", ";
570 printType(FunctionInnards, ArgTy,
571 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
574 if (FTy->isVarArg()) {
575 if (!FTy->getNumParams())
576 FunctionInnards << " int"; //dummy argument for empty vaarg functs
577 FunctionInnards << ", ...";
578 } else if (!FTy->getNumParams()) {
579 FunctionInnards << "void";
581 FunctionInnards << ')';
582 printType(Out, FTy->getReturnType(),
583 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
586 case Type::StructTyID: {
587 const StructType *STy = cast<StructType>(Ty);
588 Out << NameSoFar + " {\n";
590 for (StructType::element_iterator I = STy->element_begin(),
591 E = STy->element_end(); I != E; ++I) {
593 printType(Out, *I, false, "field" + utostr(Idx++));
598 Out << " __attribute__ ((packed))";
602 case Type::PointerTyID: {
603 const PointerType *PTy = cast<PointerType>(Ty);
604 std::string ptrName = "*" + NameSoFar;
606 if (PTy->getElementType()->isArrayTy() ||
607 PTy->getElementType()->isVectorTy())
608 ptrName = "(" + ptrName + ")";
611 // Must be a function ptr cast!
612 return printType(Out, PTy->getElementType(), false, ptrName, true, PAL);
613 return printType(Out, PTy->getElementType(), false, ptrName);
616 case Type::ArrayTyID: {
617 const ArrayType *ATy = cast<ArrayType>(Ty);
618 unsigned NumElements = ATy->getNumElements();
619 if (NumElements == 0) NumElements = 1;
620 // Arrays are wrapped in structs to allow them to have normal
621 // value semantics (avoiding the array "decay").
622 Out << NameSoFar << " { ";
623 printType(Out, ATy->getElementType(), false,
624 "array[" + utostr(NumElements) + "]");
628 case Type::OpaqueTyID: {
629 std::string TyName = "struct opaque_" + itostr(OpaqueCounter++);
630 assert(TypeNames.find(Ty) == TypeNames.end());
631 TypeNames[Ty] = TyName;
632 return Out << TyName << ' ' << NameSoFar;
635 llvm_unreachable("Unhandled case in getTypeProps!");
641 void CWriter::printConstantArray(ConstantArray *CPA, bool Static) {
643 // As a special case, print the array as a string if it is an array of
644 // ubytes or an array of sbytes with positive values.
646 const Type *ETy = CPA->getType()->getElementType();
647 bool isString = (ETy == Type::getInt8Ty(CPA->getContext()) ||
648 ETy == Type::getInt8Ty(CPA->getContext()));
650 // Make sure the last character is a null char, as automatically added by C
651 if (isString && (CPA->getNumOperands() == 0 ||
652 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
657 // Keep track of whether the last number was a hexadecimal escape
658 bool LastWasHex = false;
660 // Do not include the last character, which we know is null
661 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
662 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
664 // Print it out literally if it is a printable character. The only thing
665 // to be careful about is when the last letter output was a hex escape
666 // code, in which case we have to be careful not to print out hex digits
667 // explicitly (the C compiler thinks it is a continuation of the previous
668 // character, sheesh...)
670 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
672 if (C == '"' || C == '\\')
673 Out << "\\" << (char)C;
679 case '\n': Out << "\\n"; break;
680 case '\t': Out << "\\t"; break;
681 case '\r': Out << "\\r"; break;
682 case '\v': Out << "\\v"; break;
683 case '\a': Out << "\\a"; break;
684 case '\"': Out << "\\\""; break;
685 case '\'': Out << "\\\'"; break;
688 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
689 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
698 if (CPA->getNumOperands()) {
700 printConstant(cast<Constant>(CPA->getOperand(0)), Static);
701 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
703 printConstant(cast<Constant>(CPA->getOperand(i)), Static);
710 void CWriter::printConstantVector(ConstantVector *CP, bool Static) {
712 if (CP->getNumOperands()) {
714 printConstant(cast<Constant>(CP->getOperand(0)), Static);
715 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
717 printConstant(cast<Constant>(CP->getOperand(i)), Static);
723 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
724 // textually as a double (rather than as a reference to a stack-allocated
725 // variable). We decide this by converting CFP to a string and back into a
726 // double, and then checking whether the conversion results in a bit-equal
727 // double to the original value of CFP. This depends on us and the target C
728 // compiler agreeing on the conversion process (which is pretty likely since we
729 // only deal in IEEE FP).
731 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
733 // Do long doubles in hex for now.
734 if (CFP->getType() != Type::getFloatTy(CFP->getContext()) &&
735 CFP->getType() != Type::getDoubleTy(CFP->getContext()))
737 APFloat APF = APFloat(CFP->getValueAPF()); // copy
738 if (CFP->getType() == Type::getFloatTy(CFP->getContext()))
739 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &ignored);
740 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
742 sprintf(Buffer, "%a", APF.convertToDouble());
743 if (!strncmp(Buffer, "0x", 2) ||
744 !strncmp(Buffer, "-0x", 3) ||
745 !strncmp(Buffer, "+0x", 3))
746 return APF.bitwiseIsEqual(APFloat(atof(Buffer)));
749 std::string StrVal = ftostr(APF);
751 while (StrVal[0] == ' ')
752 StrVal.erase(StrVal.begin());
754 // Check to make sure that the stringized number is not some string like "Inf"
755 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
756 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
757 ((StrVal[0] == '-' || StrVal[0] == '+') &&
758 (StrVal[1] >= '0' && StrVal[1] <= '9')))
759 // Reparse stringized version!
760 return APF.bitwiseIsEqual(APFloat(atof(StrVal.c_str())));
765 /// Print out the casting for a cast operation. This does the double casting
766 /// necessary for conversion to the destination type, if necessary.
767 /// @brief Print a cast
768 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
769 // Print the destination type cast
771 case Instruction::UIToFP:
772 case Instruction::SIToFP:
773 case Instruction::IntToPtr:
774 case Instruction::Trunc:
775 case Instruction::BitCast:
776 case Instruction::FPExt:
777 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
779 printType(Out, DstTy);
782 case Instruction::ZExt:
783 case Instruction::PtrToInt:
784 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
786 printSimpleType(Out, DstTy, false);
789 case Instruction::SExt:
790 case Instruction::FPToSI: // For these, make sure we get a signed dest
792 printSimpleType(Out, DstTy, true);
796 llvm_unreachable("Invalid cast opcode");
799 // Print the source type cast
801 case Instruction::UIToFP:
802 case Instruction::ZExt:
804 printSimpleType(Out, SrcTy, false);
807 case Instruction::SIToFP:
808 case Instruction::SExt:
810 printSimpleType(Out, SrcTy, true);
813 case Instruction::IntToPtr:
814 case Instruction::PtrToInt:
815 // Avoid "cast to pointer from integer of different size" warnings
816 Out << "(unsigned long)";
818 case Instruction::Trunc:
819 case Instruction::BitCast:
820 case Instruction::FPExt:
821 case Instruction::FPTrunc:
822 case Instruction::FPToSI:
823 case Instruction::FPToUI:
824 break; // These don't need a source cast.
826 llvm_unreachable("Invalid cast opcode");
831 // printConstant - The LLVM Constant to C Constant converter.
832 void CWriter::printConstant(Constant *CPV, bool Static) {
833 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
834 switch (CE->getOpcode()) {
835 case Instruction::Trunc:
836 case Instruction::ZExt:
837 case Instruction::SExt:
838 case Instruction::FPTrunc:
839 case Instruction::FPExt:
840 case Instruction::UIToFP:
841 case Instruction::SIToFP:
842 case Instruction::FPToUI:
843 case Instruction::FPToSI:
844 case Instruction::PtrToInt:
845 case Instruction::IntToPtr:
846 case Instruction::BitCast:
848 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
849 if (CE->getOpcode() == Instruction::SExt &&
850 CE->getOperand(0)->getType() == Type::getInt1Ty(CPV->getContext())) {
851 // Make sure we really sext from bool here by subtracting from 0
854 printConstant(CE->getOperand(0), Static);
855 if (CE->getType() == Type::getInt1Ty(CPV->getContext()) &&
856 (CE->getOpcode() == Instruction::Trunc ||
857 CE->getOpcode() == Instruction::FPToUI ||
858 CE->getOpcode() == Instruction::FPToSI ||
859 CE->getOpcode() == Instruction::PtrToInt)) {
860 // Make sure we really truncate to bool here by anding with 1
866 case Instruction::GetElementPtr:
868 printGEPExpression(CE->getOperand(0), gep_type_begin(CPV),
869 gep_type_end(CPV), Static);
872 case Instruction::Select:
874 printConstant(CE->getOperand(0), Static);
876 printConstant(CE->getOperand(1), Static);
878 printConstant(CE->getOperand(2), Static);
881 case Instruction::Add:
882 case Instruction::FAdd:
883 case Instruction::Sub:
884 case Instruction::FSub:
885 case Instruction::Mul:
886 case Instruction::FMul:
887 case Instruction::SDiv:
888 case Instruction::UDiv:
889 case Instruction::FDiv:
890 case Instruction::URem:
891 case Instruction::SRem:
892 case Instruction::FRem:
893 case Instruction::And:
894 case Instruction::Or:
895 case Instruction::Xor:
896 case Instruction::ICmp:
897 case Instruction::Shl:
898 case Instruction::LShr:
899 case Instruction::AShr:
902 bool NeedsClosingParens = printConstExprCast(CE, Static);
903 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
904 switch (CE->getOpcode()) {
905 case Instruction::Add:
906 case Instruction::FAdd: Out << " + "; break;
907 case Instruction::Sub:
908 case Instruction::FSub: Out << " - "; break;
909 case Instruction::Mul:
910 case Instruction::FMul: Out << " * "; break;
911 case Instruction::URem:
912 case Instruction::SRem:
913 case Instruction::FRem: Out << " % "; break;
914 case Instruction::UDiv:
915 case Instruction::SDiv:
916 case Instruction::FDiv: Out << " / "; break;
917 case Instruction::And: Out << " & "; break;
918 case Instruction::Or: Out << " | "; break;
919 case Instruction::Xor: Out << " ^ "; break;
920 case Instruction::Shl: Out << " << "; break;
921 case Instruction::LShr:
922 case Instruction::AShr: Out << " >> "; break;
923 case Instruction::ICmp:
924 switch (CE->getPredicate()) {
925 case ICmpInst::ICMP_EQ: Out << " == "; break;
926 case ICmpInst::ICMP_NE: Out << " != "; break;
927 case ICmpInst::ICMP_SLT:
928 case ICmpInst::ICMP_ULT: Out << " < "; break;
929 case ICmpInst::ICMP_SLE:
930 case ICmpInst::ICMP_ULE: Out << " <= "; break;
931 case ICmpInst::ICMP_SGT:
932 case ICmpInst::ICMP_UGT: Out << " > "; break;
933 case ICmpInst::ICMP_SGE:
934 case ICmpInst::ICMP_UGE: Out << " >= "; break;
935 default: llvm_unreachable("Illegal ICmp predicate");
938 default: llvm_unreachable("Illegal opcode here!");
940 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
941 if (NeedsClosingParens)
946 case Instruction::FCmp: {
948 bool NeedsClosingParens = printConstExprCast(CE, Static);
949 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
951 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
955 switch (CE->getPredicate()) {
956 default: llvm_unreachable("Illegal FCmp predicate");
957 case FCmpInst::FCMP_ORD: op = "ord"; break;
958 case FCmpInst::FCMP_UNO: op = "uno"; break;
959 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
960 case FCmpInst::FCMP_UNE: op = "une"; break;
961 case FCmpInst::FCMP_ULT: op = "ult"; break;
962 case FCmpInst::FCMP_ULE: op = "ule"; break;
963 case FCmpInst::FCMP_UGT: op = "ugt"; break;
964 case FCmpInst::FCMP_UGE: op = "uge"; break;
965 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
966 case FCmpInst::FCMP_ONE: op = "one"; break;
967 case FCmpInst::FCMP_OLT: op = "olt"; break;
968 case FCmpInst::FCMP_OLE: op = "ole"; break;
969 case FCmpInst::FCMP_OGT: op = "ogt"; break;
970 case FCmpInst::FCMP_OGE: op = "oge"; break;
972 Out << "llvm_fcmp_" << op << "(";
973 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
975 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
978 if (NeedsClosingParens)
985 errs() << "CWriter Error: Unhandled constant expression: "
990 } else if (isa<UndefValue>(CPV) && CPV->getType()->isSingleValueType()) {
992 printType(Out, CPV->getType()); // sign doesn't matter
994 if (!CPV->getType()->isVectorTy()) {
1002 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
1003 const Type* Ty = CI->getType();
1004 if (Ty == Type::getInt1Ty(CPV->getContext()))
1005 Out << (CI->getZExtValue() ? '1' : '0');
1006 else if (Ty == Type::getInt32Ty(CPV->getContext()))
1007 Out << CI->getZExtValue() << 'u';
1008 else if (Ty->getPrimitiveSizeInBits() > 32)
1009 Out << CI->getZExtValue() << "ull";
1012 printSimpleType(Out, Ty, false) << ')';
1013 if (CI->isMinValue(true))
1014 Out << CI->getZExtValue() << 'u';
1016 Out << CI->getSExtValue();
1022 switch (CPV->getType()->getTypeID()) {
1023 case Type::FloatTyID:
1024 case Type::DoubleTyID:
1025 case Type::X86_FP80TyID:
1026 case Type::PPC_FP128TyID:
1027 case Type::FP128TyID: {
1028 ConstantFP *FPC = cast<ConstantFP>(CPV);
1029 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
1030 if (I != FPConstantMap.end()) {
1031 // Because of FP precision problems we must load from a stack allocated
1032 // value that holds the value in hex.
1033 Out << "(*(" << (FPC->getType() == Type::getFloatTy(CPV->getContext()) ?
1035 FPC->getType() == Type::getDoubleTy(CPV->getContext()) ?
1038 << "*)&FPConstant" << I->second << ')';
1041 if (FPC->getType() == Type::getFloatTy(CPV->getContext()))
1042 V = FPC->getValueAPF().convertToFloat();
1043 else if (FPC->getType() == Type::getDoubleTy(CPV->getContext()))
1044 V = FPC->getValueAPF().convertToDouble();
1046 // Long double. Convert the number to double, discarding precision.
1047 // This is not awesome, but it at least makes the CBE output somewhat
1049 APFloat Tmp = FPC->getValueAPF();
1051 Tmp.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &LosesInfo);
1052 V = Tmp.convertToDouble();
1058 // FIXME the actual NaN bits should be emitted.
1059 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
1061 const unsigned long QuietNaN = 0x7ff8UL;
1062 //const unsigned long SignalNaN = 0x7ff4UL;
1064 // We need to grab the first part of the FP #
1067 uint64_t ll = DoubleToBits(V);
1068 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
1070 std::string Num(&Buffer[0], &Buffer[6]);
1071 unsigned long Val = strtoul(Num.c_str(), 0, 16);
1073 if (FPC->getType() == Type::getFloatTy(FPC->getContext()))
1074 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
1075 << Buffer << "\") /*nan*/ ";
1077 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
1078 << Buffer << "\") /*nan*/ ";
1079 } else if (IsInf(V)) {
1081 if (V < 0) Out << '-';
1082 Out << "LLVM_INF" <<
1083 (FPC->getType() == Type::getFloatTy(FPC->getContext()) ? "F" : "")
1087 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
1088 // Print out the constant as a floating point number.
1090 sprintf(Buffer, "%a", V);
1093 Num = ftostr(FPC->getValueAPF());
1101 case Type::ArrayTyID:
1102 // Use C99 compound expression literal initializer syntax.
1105 printType(Out, CPV->getType());
1108 Out << "{ "; // Arrays are wrapped in struct types.
1109 if (ConstantArray *CA = dyn_cast<ConstantArray>(CPV)) {
1110 printConstantArray(CA, Static);
1112 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1113 const ArrayType *AT = cast<ArrayType>(CPV->getType());
1115 if (AT->getNumElements()) {
1117 Constant *CZ = Constant::getNullValue(AT->getElementType());
1118 printConstant(CZ, Static);
1119 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
1121 printConstant(CZ, Static);
1126 Out << " }"; // Arrays are wrapped in struct types.
1129 case Type::VectorTyID:
1130 // Use C99 compound expression literal initializer syntax.
1133 printType(Out, CPV->getType());
1136 if (ConstantVector *CV = dyn_cast<ConstantVector>(CPV)) {
1137 printConstantVector(CV, Static);
1139 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1140 const VectorType *VT = cast<VectorType>(CPV->getType());
1142 Constant *CZ = Constant::getNullValue(VT->getElementType());
1143 printConstant(CZ, Static);
1144 for (unsigned i = 1, e = VT->getNumElements(); i != e; ++i) {
1146 printConstant(CZ, Static);
1152 case Type::StructTyID:
1153 // Use C99 compound expression literal initializer syntax.
1156 printType(Out, CPV->getType());
1159 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
1160 const StructType *ST = cast<StructType>(CPV->getType());
1162 if (ST->getNumElements()) {
1164 printConstant(Constant::getNullValue(ST->getElementType(0)), Static);
1165 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
1167 printConstant(Constant::getNullValue(ST->getElementType(i)), Static);
1173 if (CPV->getNumOperands()) {
1175 printConstant(cast<Constant>(CPV->getOperand(0)), Static);
1176 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
1178 printConstant(cast<Constant>(CPV->getOperand(i)), Static);
1185 case Type::PointerTyID:
1186 if (isa<ConstantPointerNull>(CPV)) {
1188 printType(Out, CPV->getType()); // sign doesn't matter
1189 Out << ")/*NULL*/0)";
1191 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
1192 writeOperand(GV, Static);
1198 errs() << "Unknown constant type: " << *CPV << "\n";
1200 llvm_unreachable(0);
1204 // Some constant expressions need to be casted back to the original types
1205 // because their operands were casted to the expected type. This function takes
1206 // care of detecting that case and printing the cast for the ConstantExpr.
1207 bool CWriter::printConstExprCast(const ConstantExpr* CE, bool Static) {
1208 bool NeedsExplicitCast = false;
1209 const Type *Ty = CE->getOperand(0)->getType();
1210 bool TypeIsSigned = false;
1211 switch (CE->getOpcode()) {
1212 case Instruction::Add:
1213 case Instruction::Sub:
1214 case Instruction::Mul:
1215 // We need to cast integer arithmetic so that it is always performed
1216 // as unsigned, to avoid undefined behavior on overflow.
1217 case Instruction::LShr:
1218 case Instruction::URem:
1219 case Instruction::UDiv: NeedsExplicitCast = true; break;
1220 case Instruction::AShr:
1221 case Instruction::SRem:
1222 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1223 case Instruction::SExt:
1225 NeedsExplicitCast = true;
1226 TypeIsSigned = true;
1228 case Instruction::ZExt:
1229 case Instruction::Trunc:
1230 case Instruction::FPTrunc:
1231 case Instruction::FPExt:
1232 case Instruction::UIToFP:
1233 case Instruction::SIToFP:
1234 case Instruction::FPToUI:
1235 case Instruction::FPToSI:
1236 case Instruction::PtrToInt:
1237 case Instruction::IntToPtr:
1238 case Instruction::BitCast:
1240 NeedsExplicitCast = true;
1244 if (NeedsExplicitCast) {
1246 if (Ty->isIntegerTy() && Ty != Type::getInt1Ty(Ty->getContext()))
1247 printSimpleType(Out, Ty, TypeIsSigned);
1249 printType(Out, Ty); // not integer, sign doesn't matter
1252 return NeedsExplicitCast;
1255 // Print a constant assuming that it is the operand for a given Opcode. The
1256 // opcodes that care about sign need to cast their operands to the expected
1257 // type before the operation proceeds. This function does the casting.
1258 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1260 // Extract the operand's type, we'll need it.
1261 const Type* OpTy = CPV->getType();
1263 // Indicate whether to do the cast or not.
1264 bool shouldCast = false;
1265 bool typeIsSigned = false;
1267 // Based on the Opcode for which this Constant is being written, determine
1268 // the new type to which the operand should be casted by setting the value
1269 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1273 // for most instructions, it doesn't matter
1275 case Instruction::Add:
1276 case Instruction::Sub:
1277 case Instruction::Mul:
1278 // We need to cast integer arithmetic so that it is always performed
1279 // as unsigned, to avoid undefined behavior on overflow.
1280 case Instruction::LShr:
1281 case Instruction::UDiv:
1282 case Instruction::URem:
1285 case Instruction::AShr:
1286 case Instruction::SDiv:
1287 case Instruction::SRem:
1289 typeIsSigned = true;
1293 // Write out the casted constant if we should, otherwise just write the
1297 printSimpleType(Out, OpTy, typeIsSigned);
1299 printConstant(CPV, false);
1302 printConstant(CPV, false);
1305 std::string CWriter::GetValueName(const Value *Operand) {
1307 // Resolve potential alias.
1308 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(Operand)) {
1309 if (const Value *V = GA->resolveAliasedGlobal(false))
1313 // Mangle globals with the standard mangler interface for LLC compatibility.
1314 if (const GlobalValue *GV = dyn_cast<GlobalValue>(Operand)) {
1315 SmallString<128> Str;
1316 Mang->getNameWithPrefix(Str, GV, false);
1317 return CBEMangle(Str.str().str());
1320 std::string Name = Operand->getName();
1322 if (Name.empty()) { // Assign unique names to local temporaries.
1323 unsigned &No = AnonValueNumbers[Operand];
1325 No = ++NextAnonValueNumber;
1326 Name = "tmp__" + utostr(No);
1329 std::string VarName;
1330 VarName.reserve(Name.capacity());
1332 for (std::string::iterator I = Name.begin(), E = Name.end();
1336 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1337 (ch >= '0' && ch <= '9') || ch == '_')) {
1339 sprintf(buffer, "_%x_", ch);
1345 return "llvm_cbe_" + VarName;
1348 /// writeInstComputationInline - Emit the computation for the specified
1349 /// instruction inline, with no destination provided.
1350 void CWriter::writeInstComputationInline(Instruction &I) {
1351 // We can't currently support integer types other than 1, 8, 16, 32, 64.
1353 const Type *Ty = I.getType();
1354 if (Ty->isIntegerTy() && (Ty!=Type::getInt1Ty(I.getContext()) &&
1355 Ty!=Type::getInt8Ty(I.getContext()) &&
1356 Ty!=Type::getInt16Ty(I.getContext()) &&
1357 Ty!=Type::getInt32Ty(I.getContext()) &&
1358 Ty!=Type::getInt64Ty(I.getContext()))) {
1359 report_fatal_error("The C backend does not currently support integer "
1360 "types of widths other than 1, 8, 16, 32, 64.\n"
1361 "This is being tracked as PR 4158.");
1364 // If this is a non-trivial bool computation, make sure to truncate down to
1365 // a 1 bit value. This is important because we want "add i1 x, y" to return
1366 // "0" when x and y are true, not "2" for example.
1367 bool NeedBoolTrunc = false;
1368 if (I.getType() == Type::getInt1Ty(I.getContext()) &&
1369 !isa<ICmpInst>(I) && !isa<FCmpInst>(I))
1370 NeedBoolTrunc = true;
1382 void CWriter::writeOperandInternal(Value *Operand, bool Static) {
1383 if (Instruction *I = dyn_cast<Instruction>(Operand))
1384 // Should we inline this instruction to build a tree?
1385 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1387 writeInstComputationInline(*I);
1392 Constant* CPV = dyn_cast<Constant>(Operand);
1394 if (CPV && !isa<GlobalValue>(CPV))
1395 printConstant(CPV, Static);
1397 Out << GetValueName(Operand);
1400 void CWriter::writeOperand(Value *Operand, bool Static) {
1401 bool isAddressImplicit = isAddressExposed(Operand);
1402 if (isAddressImplicit)
1403 Out << "(&"; // Global variables are referenced as their addresses by llvm
1405 writeOperandInternal(Operand, Static);
1407 if (isAddressImplicit)
1411 // Some instructions need to have their result value casted back to the
1412 // original types because their operands were casted to the expected type.
1413 // This function takes care of detecting that case and printing the cast
1414 // for the Instruction.
1415 bool CWriter::writeInstructionCast(const Instruction &I) {
1416 const Type *Ty = I.getOperand(0)->getType();
1417 switch (I.getOpcode()) {
1418 case Instruction::Add:
1419 case Instruction::Sub:
1420 case Instruction::Mul:
1421 // We need to cast integer arithmetic so that it is always performed
1422 // as unsigned, to avoid undefined behavior on overflow.
1423 case Instruction::LShr:
1424 case Instruction::URem:
1425 case Instruction::UDiv:
1427 printSimpleType(Out, Ty, false);
1430 case Instruction::AShr:
1431 case Instruction::SRem:
1432 case Instruction::SDiv:
1434 printSimpleType(Out, Ty, true);
1442 // Write the operand with a cast to another type based on the Opcode being used.
1443 // This will be used in cases where an instruction has specific type
1444 // requirements (usually signedness) for its operands.
1445 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1447 // Extract the operand's type, we'll need it.
1448 const Type* OpTy = Operand->getType();
1450 // Indicate whether to do the cast or not.
1451 bool shouldCast = false;
1453 // Indicate whether the cast should be to a signed type or not.
1454 bool castIsSigned = false;
1456 // Based on the Opcode for which this Operand is being written, determine
1457 // the new type to which the operand should be casted by setting the value
1458 // of OpTy. If we change OpTy, also set shouldCast to true.
1461 // for most instructions, it doesn't matter
1463 case Instruction::Add:
1464 case Instruction::Sub:
1465 case Instruction::Mul:
1466 // We need to cast integer arithmetic so that it is always performed
1467 // as unsigned, to avoid undefined behavior on overflow.
1468 case Instruction::LShr:
1469 case Instruction::UDiv:
1470 case Instruction::URem: // Cast to unsigned first
1472 castIsSigned = false;
1474 case Instruction::GetElementPtr:
1475 case Instruction::AShr:
1476 case Instruction::SDiv:
1477 case Instruction::SRem: // Cast to signed first
1479 castIsSigned = true;
1483 // Write out the casted operand if we should, otherwise just write the
1487 printSimpleType(Out, OpTy, castIsSigned);
1489 writeOperand(Operand);
1492 writeOperand(Operand);
1495 // Write the operand with a cast to another type based on the icmp predicate
1497 void CWriter::writeOperandWithCast(Value* Operand, const ICmpInst &Cmp) {
1498 // This has to do a cast to ensure the operand has the right signedness.
1499 // Also, if the operand is a pointer, we make sure to cast to an integer when
1500 // doing the comparison both for signedness and so that the C compiler doesn't
1501 // optimize things like "p < NULL" to false (p may contain an integer value
1503 bool shouldCast = Cmp.isRelational();
1505 // Write out the casted operand if we should, otherwise just write the
1508 writeOperand(Operand);
1512 // Should this be a signed comparison? If so, convert to signed.
1513 bool castIsSigned = Cmp.isSigned();
1515 // If the operand was a pointer, convert to a large integer type.
1516 const Type* OpTy = Operand->getType();
1517 if (OpTy->isPointerTy())
1518 OpTy = TD->getIntPtrType(Operand->getContext());
1521 printSimpleType(Out, OpTy, castIsSigned);
1523 writeOperand(Operand);
1527 // generateCompilerSpecificCode - This is where we add conditional compilation
1528 // directives to cater to specific compilers as need be.
1530 static void generateCompilerSpecificCode(formatted_raw_ostream& Out,
1531 const TargetData *TD) {
1532 // Alloca is hard to get, and we don't want to include stdlib.h here.
1533 Out << "/* get a declaration for alloca */\n"
1534 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1535 << "#define alloca(x) __builtin_alloca((x))\n"
1536 << "#define _alloca(x) __builtin_alloca((x))\n"
1537 << "#elif defined(__APPLE__)\n"
1538 << "extern void *__builtin_alloca(unsigned long);\n"
1539 << "#define alloca(x) __builtin_alloca(x)\n"
1540 << "#define longjmp _longjmp\n"
1541 << "#define setjmp _setjmp\n"
1542 << "#elif defined(__sun__)\n"
1543 << "#if defined(__sparcv9)\n"
1544 << "extern void *__builtin_alloca(unsigned long);\n"
1546 << "extern void *__builtin_alloca(unsigned int);\n"
1548 << "#define alloca(x) __builtin_alloca(x)\n"
1549 << "#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__arm__)\n"
1550 << "#define alloca(x) __builtin_alloca(x)\n"
1551 << "#elif defined(_MSC_VER)\n"
1552 << "#define inline _inline\n"
1553 << "#define alloca(x) _alloca(x)\n"
1555 << "#include <alloca.h>\n"
1558 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1559 // If we aren't being compiled with GCC, just drop these attributes.
1560 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1561 << "#define __attribute__(X)\n"
1564 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1565 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1566 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1567 << "#elif defined(__GNUC__)\n"
1568 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1570 << "#define __EXTERNAL_WEAK__\n"
1573 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1574 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1575 << "#define __ATTRIBUTE_WEAK__\n"
1576 << "#elif defined(__GNUC__)\n"
1577 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1579 << "#define __ATTRIBUTE_WEAK__\n"
1582 // Add hidden visibility support. FIXME: APPLE_CC?
1583 Out << "#if defined(__GNUC__)\n"
1584 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1587 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1588 // From the GCC documentation:
1590 // double __builtin_nan (const char *str)
1592 // This is an implementation of the ISO C99 function nan.
1594 // Since ISO C99 defines this function in terms of strtod, which we do
1595 // not implement, a description of the parsing is in order. The string is
1596 // parsed as by strtol; that is, the base is recognized by leading 0 or
1597 // 0x prefixes. The number parsed is placed in the significand such that
1598 // the least significant bit of the number is at the least significant
1599 // bit of the significand. The number is truncated to fit the significand
1600 // field provided. The significand is forced to be a quiet NaN.
1602 // This function, if given a string literal, is evaluated early enough
1603 // that it is considered a compile-time constant.
1605 // float __builtin_nanf (const char *str)
1607 // Similar to __builtin_nan, except the return type is float.
1609 // double __builtin_inf (void)
1611 // Similar to __builtin_huge_val, except a warning is generated if the
1612 // target floating-point format does not support infinities. This
1613 // function is suitable for implementing the ISO C99 macro INFINITY.
1615 // float __builtin_inff (void)
1617 // Similar to __builtin_inf, except the return type is float.
1618 Out << "#ifdef __GNUC__\n"
1619 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1620 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1621 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1622 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1623 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1624 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1625 << "#define LLVM_PREFETCH(addr,rw,locality) "
1626 "__builtin_prefetch(addr,rw,locality)\n"
1627 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1628 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1629 << "#define LLVM_ASM __asm__\n"
1631 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1632 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1633 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1634 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1635 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1636 << "#define LLVM_INFF 0.0F /* Float */\n"
1637 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1638 << "#define __ATTRIBUTE_CTOR__\n"
1639 << "#define __ATTRIBUTE_DTOR__\n"
1640 << "#define LLVM_ASM(X)\n"
1643 Out << "#if __GNUC__ < 4 /* Old GCC's, or compilers not GCC */ \n"
1644 << "#define __builtin_stack_save() 0 /* not implemented */\n"
1645 << "#define __builtin_stack_restore(X) /* noop */\n"
1648 // Output typedefs for 128-bit integers. If these are needed with a
1649 // 32-bit target or with a C compiler that doesn't support mode(TI),
1650 // more drastic measures will be needed.
1651 Out << "#if __GNUC__ && __LP64__ /* 128-bit integer types */\n"
1652 << "typedef int __attribute__((mode(TI))) llvmInt128;\n"
1653 << "typedef unsigned __attribute__((mode(TI))) llvmUInt128;\n"
1656 // Output target-specific code that should be inserted into main.
1657 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1660 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1661 /// the StaticTors set.
1662 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1663 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1664 if (!InitList) return;
1666 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1667 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1668 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1670 if (CS->getOperand(1)->isNullValue())
1671 return; // Found a null terminator, exit printing.
1672 Constant *FP = CS->getOperand(1);
1673 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1675 FP = CE->getOperand(0);
1676 if (Function *F = dyn_cast<Function>(FP))
1677 StaticTors.insert(F);
1681 enum SpecialGlobalClass {
1683 GlobalCtors, GlobalDtors,
1687 /// getGlobalVariableClass - If this is a global that is specially recognized
1688 /// by LLVM, return a code that indicates how we should handle it.
1689 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1690 // If this is a global ctors/dtors list, handle it now.
1691 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1692 if (GV->getName() == "llvm.global_ctors")
1694 else if (GV->getName() == "llvm.global_dtors")
1698 // Otherwise, if it is other metadata, don't print it. This catches things
1699 // like debug information.
1700 if (GV->getSection() == "llvm.metadata")
1706 // PrintEscapedString - Print each character of the specified string, escaping
1707 // it if it is not printable or if it is an escape char.
1708 static void PrintEscapedString(const char *Str, unsigned Length,
1710 for (unsigned i = 0; i != Length; ++i) {
1711 unsigned char C = Str[i];
1712 if (isprint(C) && C != '\\' && C != '"')
1721 Out << "\\x" << hexdigit(C >> 4) << hexdigit(C & 0x0F);
1725 // PrintEscapedString - Print each character of the specified string, escaping
1726 // it if it is not printable or if it is an escape char.
1727 static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
1728 PrintEscapedString(Str.c_str(), Str.size(), Out);
1731 bool CWriter::doInitialization(Module &M) {
1732 FunctionPass::doInitialization(M);
1737 TD = new TargetData(&M);
1738 IL = new IntrinsicLowering(*TD);
1739 IL->AddPrototypes(M);
1742 std::string Triple = TheModule->getTargetTriple();
1744 Triple = llvm::sys::getHostTriple();
1747 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
1748 TAsm = Match->createAsmInfo(Triple);
1750 TAsm = new CBEMCAsmInfo();
1751 TCtx = new MCContext(*TAsm);
1752 Mang = new Mangler(*TCtx, *TD);
1754 // Keep track of which functions are static ctors/dtors so they can have
1755 // an attribute added to their prototypes.
1756 std::set<Function*> StaticCtors, StaticDtors;
1757 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1759 switch (getGlobalVariableClass(I)) {
1762 FindStaticTors(I, StaticCtors);
1765 FindStaticTors(I, StaticDtors);
1770 // get declaration for alloca
1771 Out << "/* Provide Declarations */\n";
1772 Out << "#include <stdarg.h>\n"; // Varargs support
1773 Out << "#include <setjmp.h>\n"; // Unwind support
1774 generateCompilerSpecificCode(Out, TD);
1776 // Provide a definition for `bool' if not compiling with a C++ compiler.
1778 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1780 << "\n\n/* Support for floating point constants */\n"
1781 << "typedef unsigned long long ConstantDoubleTy;\n"
1782 << "typedef unsigned int ConstantFloatTy;\n"
1783 << "typedef struct { unsigned long long f1; unsigned short f2; "
1784 "unsigned short pad[3]; } ConstantFP80Ty;\n"
1785 // This is used for both kinds of 128-bit long double; meaning differs.
1786 << "typedef struct { unsigned long long f1; unsigned long long f2; }"
1787 " ConstantFP128Ty;\n"
1788 << "\n\n/* Global Declarations */\n";
1790 // First output all the declarations for the program, because C requires
1791 // Functions & globals to be declared before they are used.
1793 if (!M.getModuleInlineAsm().empty()) {
1794 Out << "/* Module asm statements */\n"
1797 // Split the string into lines, to make it easier to read the .ll file.
1798 std::string Asm = M.getModuleInlineAsm();
1800 size_t NewLine = Asm.find_first_of('\n', CurPos);
1801 while (NewLine != std::string::npos) {
1802 // We found a newline, print the portion of the asm string from the
1803 // last newline up to this newline.
1805 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.begin()+NewLine),
1809 NewLine = Asm.find_first_of('\n', CurPos);
1812 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.end()), Out);
1814 << "/* End Module asm statements */\n";
1817 // Loop over the symbol table, emitting all named constants...
1818 printModuleTypes(M.getTypeSymbolTable());
1820 // Global variable declarations...
1821 if (!M.global_empty()) {
1822 Out << "\n/* External Global Variable Declarations */\n";
1823 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1826 if (I->hasExternalLinkage() || I->hasExternalWeakLinkage() ||
1827 I->hasCommonLinkage())
1829 else if (I->hasDLLImportLinkage())
1830 Out << "__declspec(dllimport) ";
1832 continue; // Internal Global
1834 // Thread Local Storage
1835 if (I->isThreadLocal())
1838 printType(Out, I->getType()->getElementType(), false, GetValueName(I));
1840 if (I->hasExternalWeakLinkage())
1841 Out << " __EXTERNAL_WEAK__";
1846 // Function declarations
1847 Out << "\n/* Function Declarations */\n";
1848 Out << "double fmod(double, double);\n"; // Support for FP rem
1849 Out << "float fmodf(float, float);\n";
1850 Out << "long double fmodl(long double, long double);\n";
1852 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1853 // Don't print declarations for intrinsic functions.
1854 if (!I->isIntrinsic() && I->getName() != "setjmp" &&
1855 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1856 if (I->hasExternalWeakLinkage())
1858 printFunctionSignature(I, true);
1859 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1860 Out << " __ATTRIBUTE_WEAK__";
1861 if (I->hasExternalWeakLinkage())
1862 Out << " __EXTERNAL_WEAK__";
1863 if (StaticCtors.count(I))
1864 Out << " __ATTRIBUTE_CTOR__";
1865 if (StaticDtors.count(I))
1866 Out << " __ATTRIBUTE_DTOR__";
1867 if (I->hasHiddenVisibility())
1868 Out << " __HIDDEN__";
1870 if (I->hasName() && I->getName()[0] == 1)
1871 Out << " LLVM_ASM(\"" << I->getName().substr(1) << "\")";
1877 // Output the global variable declarations
1878 if (!M.global_empty()) {
1879 Out << "\n\n/* Global Variable Declarations */\n";
1880 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1882 if (!I->isDeclaration()) {
1883 // Ignore special globals, such as debug info.
1884 if (getGlobalVariableClass(I))
1887 if (I->hasLocalLinkage())
1892 // Thread Local Storage
1893 if (I->isThreadLocal())
1896 printType(Out, I->getType()->getElementType(), false,
1899 if (I->hasLinkOnceLinkage())
1900 Out << " __attribute__((common))";
1901 else if (I->hasCommonLinkage()) // FIXME is this right?
1902 Out << " __ATTRIBUTE_WEAK__";
1903 else if (I->hasWeakLinkage())
1904 Out << " __ATTRIBUTE_WEAK__";
1905 else if (I->hasExternalWeakLinkage())
1906 Out << " __EXTERNAL_WEAK__";
1907 if (I->hasHiddenVisibility())
1908 Out << " __HIDDEN__";
1913 // Output the global variable definitions and contents...
1914 if (!M.global_empty()) {
1915 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1916 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1918 if (!I->isDeclaration()) {
1919 // Ignore special globals, such as debug info.
1920 if (getGlobalVariableClass(I))
1923 if (I->hasLocalLinkage())
1925 else if (I->hasDLLImportLinkage())
1926 Out << "__declspec(dllimport) ";
1927 else if (I->hasDLLExportLinkage())
1928 Out << "__declspec(dllexport) ";
1930 // Thread Local Storage
1931 if (I->isThreadLocal())
1934 printType(Out, I->getType()->getElementType(), false,
1936 if (I->hasLinkOnceLinkage())
1937 Out << " __attribute__((common))";
1938 else if (I->hasWeakLinkage())
1939 Out << " __ATTRIBUTE_WEAK__";
1940 else if (I->hasCommonLinkage())
1941 Out << " __ATTRIBUTE_WEAK__";
1943 if (I->hasHiddenVisibility())
1944 Out << " __HIDDEN__";
1946 // If the initializer is not null, emit the initializer. If it is null,
1947 // we try to avoid emitting large amounts of zeros. The problem with
1948 // this, however, occurs when the variable has weak linkage. In this
1949 // case, the assembler will complain about the variable being both weak
1950 // and common, so we disable this optimization.
1951 // FIXME common linkage should avoid this problem.
1952 if (!I->getInitializer()->isNullValue()) {
1954 writeOperand(I->getInitializer(), true);
1955 } else if (I->hasWeakLinkage()) {
1956 // We have to specify an initializer, but it doesn't have to be
1957 // complete. If the value is an aggregate, print out { 0 }, and let
1958 // the compiler figure out the rest of the zeros.
1960 if (I->getInitializer()->getType()->isStructTy() ||
1961 I->getInitializer()->getType()->isVectorTy()) {
1963 } else if (I->getInitializer()->getType()->isArrayTy()) {
1964 // As with structs and vectors, but with an extra set of braces
1965 // because arrays are wrapped in structs.
1968 // Just print it out normally.
1969 writeOperand(I->getInitializer(), true);
1977 Out << "\n\n/* Function Bodies */\n";
1979 // Emit some helper functions for dealing with FCMP instruction's
1981 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1982 Out << "return X == X && Y == Y; }\n";
1983 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1984 Out << "return X != X || Y != Y; }\n";
1985 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1986 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1987 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1988 Out << "return X != Y; }\n";
1989 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1990 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1991 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1992 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1993 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1994 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1995 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1996 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1997 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1998 Out << "return X == Y ; }\n";
1999 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
2000 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
2001 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
2002 Out << "return X < Y ; }\n";
2003 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
2004 Out << "return X > Y ; }\n";
2005 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
2006 Out << "return X <= Y ; }\n";
2007 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
2008 Out << "return X >= Y ; }\n";
2013 /// Output all floating point constants that cannot be printed accurately...
2014 void CWriter::printFloatingPointConstants(Function &F) {
2015 // Scan the module for floating point constants. If any FP constant is used
2016 // in the function, we want to redirect it here so that we do not depend on
2017 // the precision of the printed form, unless the printed form preserves
2020 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
2022 printFloatingPointConstants(*I);
2027 void CWriter::printFloatingPointConstants(const Constant *C) {
2028 // If this is a constant expression, recursively check for constant fp values.
2029 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
2030 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
2031 printFloatingPointConstants(CE->getOperand(i));
2035 // Otherwise, check for a FP constant that we need to print.
2036 const ConstantFP *FPC = dyn_cast<ConstantFP>(C);
2038 // Do not put in FPConstantMap if safe.
2039 isFPCSafeToPrint(FPC) ||
2040 // Already printed this constant?
2041 FPConstantMap.count(FPC))
2044 FPConstantMap[FPC] = FPCounter; // Number the FP constants
2046 if (FPC->getType() == Type::getDoubleTy(FPC->getContext())) {
2047 double Val = FPC->getValueAPF().convertToDouble();
2048 uint64_t i = FPC->getValueAPF().bitcastToAPInt().getZExtValue();
2049 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
2050 << " = 0x" << utohexstr(i)
2051 << "ULL; /* " << Val << " */\n";
2052 } else if (FPC->getType() == Type::getFloatTy(FPC->getContext())) {
2053 float Val = FPC->getValueAPF().convertToFloat();
2054 uint32_t i = (uint32_t)FPC->getValueAPF().bitcastToAPInt().
2056 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
2057 << " = 0x" << utohexstr(i)
2058 << "U; /* " << Val << " */\n";
2059 } else if (FPC->getType() == Type::getX86_FP80Ty(FPC->getContext())) {
2060 // api needed to prevent premature destruction
2061 APInt api = FPC->getValueAPF().bitcastToAPInt();
2062 const uint64_t *p = api.getRawData();
2063 Out << "static const ConstantFP80Ty FPConstant" << FPCounter++
2064 << " = { 0x" << utohexstr(p[0])
2065 << "ULL, 0x" << utohexstr((uint16_t)p[1]) << ",{0,0,0}"
2066 << "}; /* Long double constant */\n";
2067 } else if (FPC->getType() == Type::getPPC_FP128Ty(FPC->getContext()) ||
2068 FPC->getType() == Type::getFP128Ty(FPC->getContext())) {
2069 APInt api = FPC->getValueAPF().bitcastToAPInt();
2070 const uint64_t *p = api.getRawData();
2071 Out << "static const ConstantFP128Ty FPConstant" << FPCounter++
2073 << utohexstr(p[0]) << ", 0x" << utohexstr(p[1])
2074 << "}; /* Long double constant */\n";
2077 llvm_unreachable("Unknown float type!");
2083 /// printSymbolTable - Run through symbol table looking for type names. If a
2084 /// type name is found, emit its declaration...
2086 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
2087 Out << "/* Helper union for bitcasts */\n";
2088 Out << "typedef union {\n";
2089 Out << " unsigned int Int32;\n";
2090 Out << " unsigned long long Int64;\n";
2091 Out << " float Float;\n";
2092 Out << " double Double;\n";
2093 Out << "} llvmBitCastUnion;\n";
2095 // We are only interested in the type plane of the symbol table.
2096 TypeSymbolTable::const_iterator I = TST.begin();
2097 TypeSymbolTable::const_iterator End = TST.end();
2099 // If there are no type names, exit early.
2100 if (I == End) return;
2102 // Print out forward declarations for structure types before anything else!
2103 Out << "/* Structure forward decls */\n";
2104 for (; I != End; ++I) {
2105 std::string Name = "struct " + CBEMangle("l_"+I->first);
2106 Out << Name << ";\n";
2107 TypeNames.insert(std::make_pair(I->second, Name));
2112 // Now we can print out typedefs. Above, we guaranteed that this can only be
2113 // for struct or opaque types.
2114 Out << "/* Typedefs */\n";
2115 for (I = TST.begin(); I != End; ++I) {
2116 std::string Name = CBEMangle("l_"+I->first);
2118 printType(Out, I->second, false, Name);
2124 // Keep track of which structures have been printed so far...
2125 std::set<const Type *> StructPrinted;
2127 // Loop over all structures then push them into the stack so they are
2128 // printed in the correct order.
2130 Out << "/* Structure contents */\n";
2131 for (I = TST.begin(); I != End; ++I)
2132 if (I->second->isStructTy() || I->second->isArrayTy())
2133 // Only print out used types!
2134 printContainedStructs(I->second, StructPrinted);
2137 // Push the struct onto the stack and recursively push all structs
2138 // this one depends on.
2140 // TODO: Make this work properly with vector types
2142 void CWriter::printContainedStructs(const Type *Ty,
2143 std::set<const Type*> &StructPrinted) {
2144 // Don't walk through pointers.
2145 if (Ty->isPointerTy() || Ty->isPrimitiveType() || Ty->isIntegerTy())
2148 // Print all contained types first.
2149 for (Type::subtype_iterator I = Ty->subtype_begin(),
2150 E = Ty->subtype_end(); I != E; ++I)
2151 printContainedStructs(*I, StructPrinted);
2153 if (Ty->isStructTy() || Ty->isArrayTy()) {
2154 // Check to see if we have already printed this struct.
2155 if (StructPrinted.insert(Ty).second) {
2156 // Print structure type out.
2157 std::string Name = TypeNames[Ty];
2158 printType(Out, Ty, false, Name, true);
2164 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
2165 /// isStructReturn - Should this function actually return a struct by-value?
2166 bool isStructReturn = F->hasStructRetAttr();
2168 if (F->hasLocalLinkage()) Out << "static ";
2169 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
2170 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
2171 switch (F->getCallingConv()) {
2172 case CallingConv::X86_StdCall:
2173 Out << "__attribute__((stdcall)) ";
2175 case CallingConv::X86_FastCall:
2176 Out << "__attribute__((fastcall)) ";
2178 case CallingConv::X86_ThisCall:
2179 Out << "__attribute__((thiscall)) ";
2185 // Loop over the arguments, printing them...
2186 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
2187 const AttrListPtr &PAL = F->getAttributes();
2190 raw_string_ostream FunctionInnards(tstr);
2192 // Print out the name...
2193 FunctionInnards << GetValueName(F) << '(';
2195 bool PrintedArg = false;
2196 if (!F->isDeclaration()) {
2197 if (!F->arg_empty()) {
2198 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
2201 // If this is a struct-return function, don't print the hidden
2202 // struct-return argument.
2203 if (isStructReturn) {
2204 assert(I != E && "Invalid struct return function!");
2209 std::string ArgName;
2210 for (; I != E; ++I) {
2211 if (PrintedArg) FunctionInnards << ", ";
2212 if (I->hasName() || !Prototype)
2213 ArgName = GetValueName(I);
2216 const Type *ArgTy = I->getType();
2217 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2218 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2219 ByValParams.insert(I);
2221 printType(FunctionInnards, ArgTy,
2222 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt),
2229 // Loop over the arguments, printing them.
2230 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
2233 // If this is a struct-return function, don't print the hidden
2234 // struct-return argument.
2235 if (isStructReturn) {
2236 assert(I != E && "Invalid struct return function!");
2241 for (; I != E; ++I) {
2242 if (PrintedArg) FunctionInnards << ", ";
2243 const Type *ArgTy = *I;
2244 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2245 assert(ArgTy->isPointerTy());
2246 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2248 printType(FunctionInnards, ArgTy,
2249 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt));
2255 if (!PrintedArg && FT->isVarArg()) {
2256 FunctionInnards << "int vararg_dummy_arg";
2260 // Finish printing arguments... if this is a vararg function, print the ...,
2261 // unless there are no known types, in which case, we just emit ().
2263 if (FT->isVarArg() && PrintedArg) {
2264 FunctionInnards << ",..."; // Output varargs portion of signature!
2265 } else if (!FT->isVarArg() && !PrintedArg) {
2266 FunctionInnards << "void"; // ret() -> ret(void) in C.
2268 FunctionInnards << ')';
2270 // Get the return tpe for the function.
2272 if (!isStructReturn)
2273 RetTy = F->getReturnType();
2275 // If this is a struct-return function, print the struct-return type.
2276 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
2279 // Print out the return type and the signature built above.
2280 printType(Out, RetTy,
2281 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt),
2282 FunctionInnards.str());
2285 static inline bool isFPIntBitCast(const Instruction &I) {
2286 if (!isa<BitCastInst>(I))
2288 const Type *SrcTy = I.getOperand(0)->getType();
2289 const Type *DstTy = I.getType();
2290 return (SrcTy->isFloatingPointTy() && DstTy->isIntegerTy()) ||
2291 (DstTy->isFloatingPointTy() && SrcTy->isIntegerTy());
2294 void CWriter::printFunction(Function &F) {
2295 /// isStructReturn - Should this function actually return a struct by-value?
2296 bool isStructReturn = F.hasStructRetAttr();
2298 printFunctionSignature(&F, false);
2301 // If this is a struct return function, handle the result with magic.
2302 if (isStructReturn) {
2303 const Type *StructTy =
2304 cast<PointerType>(F.arg_begin()->getType())->getElementType();
2306 printType(Out, StructTy, false, "StructReturn");
2307 Out << "; /* Struct return temporary */\n";
2310 printType(Out, F.arg_begin()->getType(), false,
2311 GetValueName(F.arg_begin()));
2312 Out << " = &StructReturn;\n";
2315 bool PrintedVar = false;
2317 // print local variable information for the function
2318 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
2319 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
2321 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
2322 Out << "; /* Address-exposed local */\n";
2324 } else if (I->getType() != Type::getVoidTy(F.getContext()) &&
2325 !isInlinableInst(*I)) {
2327 printType(Out, I->getType(), false, GetValueName(&*I));
2330 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
2332 printType(Out, I->getType(), false,
2333 GetValueName(&*I)+"__PHI_TEMPORARY");
2338 // We need a temporary for the BitCast to use so it can pluck a value out
2339 // of a union to do the BitCast. This is separate from the need for a
2340 // variable to hold the result of the BitCast.
2341 if (isFPIntBitCast(*I)) {
2342 Out << " llvmBitCastUnion " << GetValueName(&*I)
2343 << "__BITCAST_TEMPORARY;\n";
2351 if (F.hasExternalLinkage() && F.getName() == "main")
2352 Out << " CODE_FOR_MAIN();\n";
2354 // print the basic blocks
2355 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
2356 if (Loop *L = LI->getLoopFor(BB)) {
2357 if (L->getHeader() == BB && L->getParentLoop() == 0)
2360 printBasicBlock(BB);
2367 void CWriter::printLoop(Loop *L) {
2368 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
2369 << "' to make GCC happy */\n";
2370 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
2371 BasicBlock *BB = L->getBlocks()[i];
2372 Loop *BBLoop = LI->getLoopFor(BB);
2374 printBasicBlock(BB);
2375 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
2378 Out << " } while (1); /* end of syntactic loop '"
2379 << L->getHeader()->getName() << "' */\n";
2382 void CWriter::printBasicBlock(BasicBlock *BB) {
2384 // Don't print the label for the basic block if there are no uses, or if
2385 // the only terminator use is the predecessor basic block's terminator.
2386 // We have to scan the use list because PHI nodes use basic blocks too but
2387 // do not require a label to be generated.
2389 bool NeedsLabel = false;
2390 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
2391 if (isGotoCodeNecessary(*PI, BB)) {
2396 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2398 // Output all of the instructions in the basic block...
2399 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2401 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2402 if (II->getType() != Type::getVoidTy(BB->getContext()) &&
2407 writeInstComputationInline(*II);
2412 // Don't emit prefix or suffix for the terminator.
2413 visit(*BB->getTerminator());
2417 // Specific Instruction type classes... note that all of the casts are
2418 // necessary because we use the instruction classes as opaque types...
2420 void CWriter::visitReturnInst(ReturnInst &I) {
2421 // If this is a struct return function, return the temporary struct.
2422 bool isStructReturn = I.getParent()->getParent()->hasStructRetAttr();
2424 if (isStructReturn) {
2425 Out << " return StructReturn;\n";
2429 // Don't output a void return if this is the last basic block in the function
2430 if (I.getNumOperands() == 0 &&
2431 &*--I.getParent()->getParent()->end() == I.getParent() &&
2432 !I.getParent()->size() == 1) {
2436 if (I.getNumOperands() > 1) {
2439 printType(Out, I.getParent()->getParent()->getReturnType());
2440 Out << " llvm_cbe_mrv_temp = {\n";
2441 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
2443 writeOperand(I.getOperand(i));
2449 Out << " return llvm_cbe_mrv_temp;\n";
2455 if (I.getNumOperands()) {
2457 writeOperand(I.getOperand(0));
2462 void CWriter::visitSwitchInst(SwitchInst &SI) {
2465 writeOperand(SI.getOperand(0));
2466 Out << ") {\n default:\n";
2467 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2468 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2470 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2472 writeOperand(SI.getOperand(i));
2474 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2475 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2476 printBranchToBlock(SI.getParent(), Succ, 2);
2477 if (Function::iterator(Succ) == llvm::next(Function::iterator(SI.getParent())))
2483 void CWriter::visitIndirectBrInst(IndirectBrInst &IBI) {
2484 Out << " goto *(void*)(";
2485 writeOperand(IBI.getOperand(0));
2489 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2490 Out << " /*UNREACHABLE*/;\n";
2493 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2494 /// FIXME: This should be reenabled, but loop reordering safe!!
2497 if (llvm::next(Function::iterator(From)) != Function::iterator(To))
2498 return true; // Not the direct successor, we need a goto.
2500 //isa<SwitchInst>(From->getTerminator())
2502 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2507 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2508 BasicBlock *Successor,
2510 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2511 PHINode *PN = cast<PHINode>(I);
2512 // Now we have to do the printing.
2513 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2514 if (!isa<UndefValue>(IV)) {
2515 Out << std::string(Indent, ' ');
2516 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2518 Out << "; /* for PHI node */\n";
2523 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2525 if (isGotoCodeNecessary(CurBB, Succ)) {
2526 Out << std::string(Indent, ' ') << " goto ";
2532 // Branch instruction printing - Avoid printing out a branch to a basic block
2533 // that immediately succeeds the current one.
2535 void CWriter::visitBranchInst(BranchInst &I) {
2537 if (I.isConditional()) {
2538 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2540 writeOperand(I.getCondition());
2543 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2544 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2546 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2547 Out << " } else {\n";
2548 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2549 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2552 // First goto not necessary, assume second one is...
2554 writeOperand(I.getCondition());
2557 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2558 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2563 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2564 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2569 // PHI nodes get copied into temporary values at the end of predecessor basic
2570 // blocks. We now need to copy these temporary values into the REAL value for
2572 void CWriter::visitPHINode(PHINode &I) {
2574 Out << "__PHI_TEMPORARY";
2578 void CWriter::visitBinaryOperator(Instruction &I) {
2579 // binary instructions, shift instructions, setCond instructions.
2580 assert(!I.getType()->isPointerTy());
2582 // We must cast the results of binary operations which might be promoted.
2583 bool needsCast = false;
2584 if ((I.getType() == Type::getInt8Ty(I.getContext())) ||
2585 (I.getType() == Type::getInt16Ty(I.getContext()))
2586 || (I.getType() == Type::getFloatTy(I.getContext()))) {
2589 printType(Out, I.getType(), false);
2593 // If this is a negation operation, print it out as such. For FP, we don't
2594 // want to print "-0.0 - X".
2595 if (BinaryOperator::isNeg(&I)) {
2597 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2599 } else if (BinaryOperator::isFNeg(&I)) {
2601 writeOperand(BinaryOperator::getFNegArgument(cast<BinaryOperator>(&I)));
2603 } else if (I.getOpcode() == Instruction::FRem) {
2604 // Output a call to fmod/fmodf instead of emitting a%b
2605 if (I.getType() == Type::getFloatTy(I.getContext()))
2607 else if (I.getType() == Type::getDoubleTy(I.getContext()))
2609 else // all 3 flavors of long double
2611 writeOperand(I.getOperand(0));
2613 writeOperand(I.getOperand(1));
2617 // Write out the cast of the instruction's value back to the proper type
2619 bool NeedsClosingParens = writeInstructionCast(I);
2621 // Certain instructions require the operand to be forced to a specific type
2622 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2623 // below for operand 1
2624 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2626 switch (I.getOpcode()) {
2627 case Instruction::Add:
2628 case Instruction::FAdd: Out << " + "; break;
2629 case Instruction::Sub:
2630 case Instruction::FSub: Out << " - "; break;
2631 case Instruction::Mul:
2632 case Instruction::FMul: Out << " * "; break;
2633 case Instruction::URem:
2634 case Instruction::SRem:
2635 case Instruction::FRem: Out << " % "; break;
2636 case Instruction::UDiv:
2637 case Instruction::SDiv:
2638 case Instruction::FDiv: Out << " / "; break;
2639 case Instruction::And: Out << " & "; break;
2640 case Instruction::Or: Out << " | "; break;
2641 case Instruction::Xor: Out << " ^ "; break;
2642 case Instruction::Shl : Out << " << "; break;
2643 case Instruction::LShr:
2644 case Instruction::AShr: Out << " >> "; break;
2647 errs() << "Invalid operator type!" << I;
2649 llvm_unreachable(0);
2652 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2653 if (NeedsClosingParens)
2662 void CWriter::visitICmpInst(ICmpInst &I) {
2663 // We must cast the results of icmp which might be promoted.
2664 bool needsCast = false;
2666 // Write out the cast of the instruction's value back to the proper type
2668 bool NeedsClosingParens = writeInstructionCast(I);
2670 // Certain icmp predicate require the operand to be forced to a specific type
2671 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2672 // below for operand 1
2673 writeOperandWithCast(I.getOperand(0), I);
2675 switch (I.getPredicate()) {
2676 case ICmpInst::ICMP_EQ: Out << " == "; break;
2677 case ICmpInst::ICMP_NE: Out << " != "; break;
2678 case ICmpInst::ICMP_ULE:
2679 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2680 case ICmpInst::ICMP_UGE:
2681 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2682 case ICmpInst::ICMP_ULT:
2683 case ICmpInst::ICMP_SLT: Out << " < "; break;
2684 case ICmpInst::ICMP_UGT:
2685 case ICmpInst::ICMP_SGT: Out << " > "; break;
2688 errs() << "Invalid icmp predicate!" << I;
2690 llvm_unreachable(0);
2693 writeOperandWithCast(I.getOperand(1), I);
2694 if (NeedsClosingParens)
2702 void CWriter::visitFCmpInst(FCmpInst &I) {
2703 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2707 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2713 switch (I.getPredicate()) {
2714 default: llvm_unreachable("Illegal FCmp predicate");
2715 case FCmpInst::FCMP_ORD: op = "ord"; break;
2716 case FCmpInst::FCMP_UNO: op = "uno"; break;
2717 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2718 case FCmpInst::FCMP_UNE: op = "une"; break;
2719 case FCmpInst::FCMP_ULT: op = "ult"; break;
2720 case FCmpInst::FCMP_ULE: op = "ule"; break;
2721 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2722 case FCmpInst::FCMP_UGE: op = "uge"; break;
2723 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2724 case FCmpInst::FCMP_ONE: op = "one"; break;
2725 case FCmpInst::FCMP_OLT: op = "olt"; break;
2726 case FCmpInst::FCMP_OLE: op = "ole"; break;
2727 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2728 case FCmpInst::FCMP_OGE: op = "oge"; break;
2731 Out << "llvm_fcmp_" << op << "(";
2732 // Write the first operand
2733 writeOperand(I.getOperand(0));
2735 // Write the second operand
2736 writeOperand(I.getOperand(1));
2740 static const char * getFloatBitCastField(const Type *Ty) {
2741 switch (Ty->getTypeID()) {
2742 default: llvm_unreachable("Invalid Type");
2743 case Type::FloatTyID: return "Float";
2744 case Type::DoubleTyID: return "Double";
2745 case Type::IntegerTyID: {
2746 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2755 void CWriter::visitCastInst(CastInst &I) {
2756 const Type *DstTy = I.getType();
2757 const Type *SrcTy = I.getOperand(0)->getType();
2758 if (isFPIntBitCast(I)) {
2760 // These int<->float and long<->double casts need to be handled specially
2761 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2762 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2763 writeOperand(I.getOperand(0));
2764 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2765 << getFloatBitCastField(I.getType());
2771 printCast(I.getOpcode(), SrcTy, DstTy);
2773 // Make a sext from i1 work by subtracting the i1 from 0 (an int).
2774 if (SrcTy == Type::getInt1Ty(I.getContext()) &&
2775 I.getOpcode() == Instruction::SExt)
2778 writeOperand(I.getOperand(0));
2780 if (DstTy == Type::getInt1Ty(I.getContext()) &&
2781 (I.getOpcode() == Instruction::Trunc ||
2782 I.getOpcode() == Instruction::FPToUI ||
2783 I.getOpcode() == Instruction::FPToSI ||
2784 I.getOpcode() == Instruction::PtrToInt)) {
2785 // Make sure we really get a trunc to bool by anding the operand with 1
2791 void CWriter::visitSelectInst(SelectInst &I) {
2793 writeOperand(I.getCondition());
2795 writeOperand(I.getTrueValue());
2797 writeOperand(I.getFalseValue());
2802 void CWriter::lowerIntrinsics(Function &F) {
2803 // This is used to keep track of intrinsics that get generated to a lowered
2804 // function. We must generate the prototypes before the function body which
2805 // will only be expanded on first use (by the loop below).
2806 std::vector<Function*> prototypesToGen;
2808 // Examine all the instructions in this function to find the intrinsics that
2809 // need to be lowered.
2810 for (Function::iterator BB = F.begin(), EE = F.end(); BB != EE; ++BB)
2811 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2812 if (CallInst *CI = dyn_cast<CallInst>(I++))
2813 if (Function *F = CI->getCalledFunction())
2814 switch (F->getIntrinsicID()) {
2815 case Intrinsic::not_intrinsic:
2816 case Intrinsic::memory_barrier:
2817 case Intrinsic::vastart:
2818 case Intrinsic::vacopy:
2819 case Intrinsic::vaend:
2820 case Intrinsic::returnaddress:
2821 case Intrinsic::frameaddress:
2822 case Intrinsic::setjmp:
2823 case Intrinsic::longjmp:
2824 case Intrinsic::prefetch:
2825 case Intrinsic::powi:
2826 case Intrinsic::x86_sse_cmp_ss:
2827 case Intrinsic::x86_sse_cmp_ps:
2828 case Intrinsic::x86_sse2_cmp_sd:
2829 case Intrinsic::x86_sse2_cmp_pd:
2830 case Intrinsic::ppc_altivec_lvsl:
2831 // We directly implement these intrinsics
2834 // If this is an intrinsic that directly corresponds to a GCC
2835 // builtin, we handle it.
2836 const char *BuiltinName = "";
2837 #define GET_GCC_BUILTIN_NAME
2838 #include "llvm/Intrinsics.gen"
2839 #undef GET_GCC_BUILTIN_NAME
2840 // If we handle it, don't lower it.
2841 if (BuiltinName[0]) break;
2843 // All other intrinsic calls we must lower.
2844 Instruction *Before = 0;
2845 if (CI != &BB->front())
2846 Before = prior(BasicBlock::iterator(CI));
2848 IL->LowerIntrinsicCall(CI);
2849 if (Before) { // Move iterator to instruction after call
2854 // If the intrinsic got lowered to another call, and that call has
2855 // a definition then we need to make sure its prototype is emitted
2856 // before any calls to it.
2857 if (CallInst *Call = dyn_cast<CallInst>(I))
2858 if (Function *NewF = Call->getCalledFunction())
2859 if (!NewF->isDeclaration())
2860 prototypesToGen.push_back(NewF);
2865 // We may have collected some prototypes to emit in the loop above.
2866 // Emit them now, before the function that uses them is emitted. But,
2867 // be careful not to emit them twice.
2868 std::vector<Function*>::iterator I = prototypesToGen.begin();
2869 std::vector<Function*>::iterator E = prototypesToGen.end();
2870 for ( ; I != E; ++I) {
2871 if (intrinsicPrototypesAlreadyGenerated.insert(*I).second) {
2873 printFunctionSignature(*I, true);
2879 void CWriter::visitCallInst(CallInst &I) {
2880 if (isa<InlineAsm>(I.getCalledValue()))
2881 return visitInlineAsm(I);
2883 bool WroteCallee = false;
2885 // Handle intrinsic function calls first...
2886 if (Function *F = I.getCalledFunction())
2887 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
2888 if (visitBuiltinCall(I, ID, WroteCallee))
2891 Value *Callee = I.getCalledValue();
2893 const PointerType *PTy = cast<PointerType>(Callee->getType());
2894 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2896 // If this is a call to a struct-return function, assign to the first
2897 // parameter instead of passing it to the call.
2898 const AttrListPtr &PAL = I.getAttributes();
2899 bool hasByVal = I.hasByValArgument();
2900 bool isStructRet = I.hasStructRetAttr();
2902 writeOperandDeref(I.getArgOperand(0));
2906 if (I.isTailCall()) Out << " /*tail*/ ";
2909 // If this is an indirect call to a struct return function, we need to cast
2910 // the pointer. Ditto for indirect calls with byval arguments.
2911 bool NeedsCast = (hasByVal || isStructRet) && !isa<Function>(Callee);
2913 // GCC is a real PITA. It does not permit codegening casts of functions to
2914 // function pointers if they are in a call (it generates a trap instruction
2915 // instead!). We work around this by inserting a cast to void* in between
2916 // the function and the function pointer cast. Unfortunately, we can't just
2917 // form the constant expression here, because the folder will immediately
2920 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2921 // that void* and function pointers have the same size. :( To deal with this
2922 // in the common case, we handle casts where the number of arguments passed
2925 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2927 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2933 // Ok, just cast the pointer type.
2936 printStructReturnPointerFunctionType(Out, PAL,
2937 cast<PointerType>(I.getCalledValue()->getType()));
2939 printType(Out, I.getCalledValue()->getType(), false, "", true, PAL);
2941 printType(Out, I.getCalledValue()->getType());
2944 writeOperand(Callee);
2945 if (NeedsCast) Out << ')';
2950 bool PrintedArg = false;
2951 if(FTy->isVarArg() && !FTy->getNumParams()) {
2952 Out << "0 /*dummy arg*/";
2956 unsigned NumDeclaredParams = FTy->getNumParams();
2958 CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
2960 if (isStructRet) { // Skip struct return argument.
2966 for (; AI != AE; ++AI, ++ArgNo) {
2967 if (PrintedArg) Out << ", ";
2968 if (ArgNo < NumDeclaredParams &&
2969 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2971 printType(Out, FTy->getParamType(ArgNo),
2972 /*isSigned=*/PAL.paramHasAttr(ArgNo+1, Attribute::SExt));
2975 // Check if the argument is expected to be passed by value.
2976 if (I.paramHasAttr(ArgNo+1, Attribute::ByVal))
2977 writeOperandDeref(*AI);
2985 /// visitBuiltinCall - Handle the call to the specified builtin. Returns true
2986 /// if the entire call is handled, return false if it wasn't handled, and
2987 /// optionally set 'WroteCallee' if the callee has already been printed out.
2988 bool CWriter::visitBuiltinCall(CallInst &I, Intrinsic::ID ID,
2989 bool &WroteCallee) {
2992 // If this is an intrinsic that directly corresponds to a GCC
2993 // builtin, we emit it here.
2994 const char *BuiltinName = "";
2995 Function *F = I.getCalledFunction();
2996 #define GET_GCC_BUILTIN_NAME
2997 #include "llvm/Intrinsics.gen"
2998 #undef GET_GCC_BUILTIN_NAME
2999 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
3005 case Intrinsic::memory_barrier:
3006 Out << "__sync_synchronize()";
3008 case Intrinsic::vastart:
3011 Out << "va_start(*(va_list*)";
3012 writeOperand(I.getArgOperand(0));
3014 // Output the last argument to the enclosing function.
3015 if (I.getParent()->getParent()->arg_empty())
3016 Out << "vararg_dummy_arg";
3018 writeOperand(--I.getParent()->getParent()->arg_end());
3021 case Intrinsic::vaend:
3022 if (!isa<ConstantPointerNull>(I.getArgOperand(0))) {
3023 Out << "0; va_end(*(va_list*)";
3024 writeOperand(I.getArgOperand(0));
3027 Out << "va_end(*(va_list*)0)";
3030 case Intrinsic::vacopy:
3032 Out << "va_copy(*(va_list*)";
3033 writeOperand(I.getArgOperand(0));
3034 Out << ", *(va_list*)";
3035 writeOperand(I.getArgOperand(1));
3038 case Intrinsic::returnaddress:
3039 Out << "__builtin_return_address(";
3040 writeOperand(I.getArgOperand(0));
3043 case Intrinsic::frameaddress:
3044 Out << "__builtin_frame_address(";
3045 writeOperand(I.getArgOperand(0));
3048 case Intrinsic::powi:
3049 Out << "__builtin_powi(";
3050 writeOperand(I.getArgOperand(0));
3052 writeOperand(I.getArgOperand(1));
3055 case Intrinsic::setjmp:
3056 Out << "setjmp(*(jmp_buf*)";
3057 writeOperand(I.getArgOperand(0));
3060 case Intrinsic::longjmp:
3061 Out << "longjmp(*(jmp_buf*)";
3062 writeOperand(I.getArgOperand(0));
3064 writeOperand(I.getArgOperand(1));
3067 case Intrinsic::prefetch:
3068 Out << "LLVM_PREFETCH((const void *)";
3069 writeOperand(I.getArgOperand(0));
3071 writeOperand(I.getArgOperand(1));
3073 writeOperand(I.getArgOperand(2));
3076 case Intrinsic::stacksave:
3077 // Emit this as: Val = 0; *((void**)&Val) = __builtin_stack_save()
3078 // to work around GCC bugs (see PR1809).
3079 Out << "0; *((void**)&" << GetValueName(&I)
3080 << ") = __builtin_stack_save()";
3082 case Intrinsic::x86_sse_cmp_ss:
3083 case Intrinsic::x86_sse_cmp_ps:
3084 case Intrinsic::x86_sse2_cmp_sd:
3085 case Intrinsic::x86_sse2_cmp_pd:
3087 printType(Out, I.getType());
3089 // Multiple GCC builtins multiplex onto this intrinsic.
3090 switch (cast<ConstantInt>(I.getArgOperand(2))->getZExtValue()) {
3091 default: llvm_unreachable("Invalid llvm.x86.sse.cmp!");
3092 case 0: Out << "__builtin_ia32_cmpeq"; break;
3093 case 1: Out << "__builtin_ia32_cmplt"; break;
3094 case 2: Out << "__builtin_ia32_cmple"; break;
3095 case 3: Out << "__builtin_ia32_cmpunord"; break;
3096 case 4: Out << "__builtin_ia32_cmpneq"; break;
3097 case 5: Out << "__builtin_ia32_cmpnlt"; break;
3098 case 6: Out << "__builtin_ia32_cmpnle"; break;
3099 case 7: Out << "__builtin_ia32_cmpord"; break;
3101 if (ID == Intrinsic::x86_sse_cmp_ps || ID == Intrinsic::x86_sse2_cmp_pd)
3105 if (ID == Intrinsic::x86_sse_cmp_ss || ID == Intrinsic::x86_sse_cmp_ps)
3111 writeOperand(I.getArgOperand(0));
3113 writeOperand(I.getArgOperand(1));
3116 case Intrinsic::ppc_altivec_lvsl:
3118 printType(Out, I.getType());
3120 Out << "__builtin_altivec_lvsl(0, (void*)";
3121 writeOperand(I.getArgOperand(0));
3127 //This converts the llvm constraint string to something gcc is expecting.
3128 //TODO: work out platform independent constraints and factor those out
3129 // of the per target tables
3130 // handle multiple constraint codes
3131 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
3132 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
3134 // Grab the translation table from MCAsmInfo if it exists.
3135 const MCAsmInfo *TargetAsm;
3136 std::string Triple = TheModule->getTargetTriple();
3138 Triple = llvm::sys::getHostTriple();
3141 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
3142 TargetAsm = Match->createAsmInfo(Triple);
3146 const char *const *table = TargetAsm->getAsmCBE();
3148 // Search the translation table if it exists.
3149 for (int i = 0; table && table[i]; i += 2)
3150 if (c.Codes[0] == table[i]) {
3155 // Default is identity.
3160 //TODO: import logic from AsmPrinter.cpp
3161 static std::string gccifyAsm(std::string asmstr) {
3162 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
3163 if (asmstr[i] == '\n')
3164 asmstr.replace(i, 1, "\\n");
3165 else if (asmstr[i] == '\t')
3166 asmstr.replace(i, 1, "\\t");
3167 else if (asmstr[i] == '$') {
3168 if (asmstr[i + 1] == '{') {
3169 std::string::size_type a = asmstr.find_first_of(':', i + 1);
3170 std::string::size_type b = asmstr.find_first_of('}', i + 1);
3171 std::string n = "%" +
3172 asmstr.substr(a + 1, b - a - 1) +
3173 asmstr.substr(i + 2, a - i - 2);
3174 asmstr.replace(i, b - i + 1, n);
3177 asmstr.replace(i, 1, "%");
3179 else if (asmstr[i] == '%')//grr
3180 { asmstr.replace(i, 1, "%%"); ++i;}
3185 //TODO: assumptions about what consume arguments from the call are likely wrong
3186 // handle communitivity
3187 void CWriter::visitInlineAsm(CallInst &CI) {
3188 InlineAsm* as = cast<InlineAsm>(CI.getCalledValue());
3189 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
3191 std::vector<std::pair<Value*, int> > ResultVals;
3192 if (CI.getType() == Type::getVoidTy(CI.getContext()))
3194 else if (const StructType *ST = dyn_cast<StructType>(CI.getType())) {
3195 for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i)
3196 ResultVals.push_back(std::make_pair(&CI, (int)i));
3198 ResultVals.push_back(std::make_pair(&CI, -1));
3201 // Fix up the asm string for gcc and emit it.
3202 Out << "__asm__ volatile (\"" << gccifyAsm(as->getAsmString()) << "\"\n";
3205 unsigned ValueCount = 0;
3206 bool IsFirst = true;
3208 // Convert over all the output constraints.
3209 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3210 E = Constraints.end(); I != E; ++I) {
3212 if (I->Type != InlineAsm::isOutput) {
3214 continue; // Ignore non-output constraints.
3217 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3218 std::string C = InterpretASMConstraint(*I);
3219 if (C.empty()) continue;
3230 if (ValueCount < ResultVals.size()) {
3231 DestVal = ResultVals[ValueCount].first;
3232 DestValNo = ResultVals[ValueCount].second;
3234 DestVal = CI.getArgOperand(ValueCount-ResultVals.size());
3236 if (I->isEarlyClobber)
3239 Out << "\"=" << C << "\"(" << GetValueName(DestVal);
3240 if (DestValNo != -1)
3241 Out << ".field" << DestValNo; // Multiple retvals.
3247 // Convert over all the input constraints.
3251 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3252 E = Constraints.end(); I != E; ++I) {
3253 if (I->Type != InlineAsm::isInput) {
3255 continue; // Ignore non-input constraints.
3258 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3259 std::string C = InterpretASMConstraint(*I);
3260 if (C.empty()) continue;
3267 assert(ValueCount >= ResultVals.size() && "Input can't refer to result");
3268 Value *SrcVal = CI.getArgOperand(ValueCount-ResultVals.size());
3270 Out << "\"" << C << "\"(";
3272 writeOperand(SrcVal);
3274 writeOperandDeref(SrcVal);
3278 // Convert over the clobber constraints.
3280 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3281 E = Constraints.end(); I != E; ++I) {
3282 if (I->Type != InlineAsm::isClobber)
3283 continue; // Ignore non-input constraints.
3285 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3286 std::string C = InterpretASMConstraint(*I);
3287 if (C.empty()) continue;
3294 Out << '\"' << C << '"';
3300 void CWriter::visitAllocaInst(AllocaInst &I) {
3302 printType(Out, I.getType());
3303 Out << ") alloca(sizeof(";
3304 printType(Out, I.getType()->getElementType());
3306 if (I.isArrayAllocation()) {
3308 writeOperand(I.getOperand(0));
3313 void CWriter::printGEPExpression(Value *Ptr, gep_type_iterator I,
3314 gep_type_iterator E, bool Static) {
3316 // If there are no indices, just print out the pointer.
3322 // Find out if the last index is into a vector. If so, we have to print this
3323 // specially. Since vectors can't have elements of indexable type, only the
3324 // last index could possibly be of a vector element.
3325 const VectorType *LastIndexIsVector = 0;
3327 for (gep_type_iterator TmpI = I; TmpI != E; ++TmpI)
3328 LastIndexIsVector = dyn_cast<VectorType>(*TmpI);
3333 // If the last index is into a vector, we can't print it as &a[i][j] because
3334 // we can't index into a vector with j in GCC. Instead, emit this as
3335 // (((float*)&a[i])+j)
3336 if (LastIndexIsVector) {
3338 printType(Out, PointerType::getUnqual(LastIndexIsVector->getElementType()));
3344 // If the first index is 0 (very typical) we can do a number of
3345 // simplifications to clean up the code.
3346 Value *FirstOp = I.getOperand();
3347 if (!isa<Constant>(FirstOp) || !cast<Constant>(FirstOp)->isNullValue()) {
3348 // First index isn't simple, print it the hard way.
3351 ++I; // Skip the zero index.
3353 // Okay, emit the first operand. If Ptr is something that is already address
3354 // exposed, like a global, avoid emitting (&foo)[0], just emit foo instead.
3355 if (isAddressExposed(Ptr)) {
3356 writeOperandInternal(Ptr, Static);
3357 } else if (I != E && (*I)->isStructTy()) {
3358 // If we didn't already emit the first operand, see if we can print it as
3359 // P->f instead of "P[0].f"
3361 Out << "->field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3362 ++I; // eat the struct index as well.
3364 // Instead of emitting P[0][1], emit (*P)[1], which is more idiomatic.
3371 for (; I != E; ++I) {
3372 if ((*I)->isStructTy()) {
3373 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3374 } else if ((*I)->isArrayTy()) {
3376 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3378 } else if (!(*I)->isVectorTy()) {
3380 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3383 // If the last index is into a vector, then print it out as "+j)". This
3384 // works with the 'LastIndexIsVector' code above.
3385 if (isa<Constant>(I.getOperand()) &&
3386 cast<Constant>(I.getOperand())->isNullValue()) {
3387 Out << "))"; // avoid "+0".
3390 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3398 void CWriter::writeMemoryAccess(Value *Operand, const Type *OperandType,
3399 bool IsVolatile, unsigned Alignment) {
3401 bool IsUnaligned = Alignment &&
3402 Alignment < TD->getABITypeAlignment(OperandType);
3406 if (IsVolatile || IsUnaligned) {
3409 Out << "struct __attribute__ ((packed, aligned(" << Alignment << "))) {";
3410 printType(Out, OperandType, false, IsUnaligned ? "data" : "volatile*");
3413 if (IsVolatile) Out << "volatile ";
3419 writeOperand(Operand);
3421 if (IsVolatile || IsUnaligned) {
3428 void CWriter::visitLoadInst(LoadInst &I) {
3429 writeMemoryAccess(I.getOperand(0), I.getType(), I.isVolatile(),
3434 void CWriter::visitStoreInst(StoreInst &I) {
3435 writeMemoryAccess(I.getPointerOperand(), I.getOperand(0)->getType(),
3436 I.isVolatile(), I.getAlignment());
3438 Value *Operand = I.getOperand(0);
3439 Constant *BitMask = 0;
3440 if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
3441 if (!ITy->isPowerOf2ByteWidth())
3442 // We have a bit width that doesn't match an even power-of-2 byte
3443 // size. Consequently we must & the value with the type's bit mask
3444 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
3447 writeOperand(Operand);
3450 printConstant(BitMask, false);
3455 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
3456 printGEPExpression(I.getPointerOperand(), gep_type_begin(I),
3457 gep_type_end(I), false);
3460 void CWriter::visitVAArgInst(VAArgInst &I) {
3461 Out << "va_arg(*(va_list*)";
3462 writeOperand(I.getOperand(0));
3464 printType(Out, I.getType());
3468 void CWriter::visitInsertElementInst(InsertElementInst &I) {
3469 const Type *EltTy = I.getType()->getElementType();
3470 writeOperand(I.getOperand(0));
3473 printType(Out, PointerType::getUnqual(EltTy));
3474 Out << ")(&" << GetValueName(&I) << "))[";
3475 writeOperand(I.getOperand(2));
3477 writeOperand(I.getOperand(1));
3481 void CWriter::visitExtractElementInst(ExtractElementInst &I) {
3482 // We know that our operand is not inlined.
3485 cast<VectorType>(I.getOperand(0)->getType())->getElementType();
3486 printType(Out, PointerType::getUnqual(EltTy));
3487 Out << ")(&" << GetValueName(I.getOperand(0)) << "))[";
3488 writeOperand(I.getOperand(1));
3492 void CWriter::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
3494 printType(Out, SVI.getType());
3496 const VectorType *VT = SVI.getType();
3497 unsigned NumElts = VT->getNumElements();
3498 const Type *EltTy = VT->getElementType();
3500 for (unsigned i = 0; i != NumElts; ++i) {
3502 int SrcVal = SVI.getMaskValue(i);
3503 if ((unsigned)SrcVal >= NumElts*2) {
3504 Out << " 0/*undef*/ ";
3506 Value *Op = SVI.getOperand((unsigned)SrcVal >= NumElts);
3507 if (isa<Instruction>(Op)) {
3508 // Do an extractelement of this value from the appropriate input.
3510 printType(Out, PointerType::getUnqual(EltTy));
3511 Out << ")(&" << GetValueName(Op)
3512 << "))[" << (SrcVal & (NumElts-1)) << "]";
3513 } else if (isa<ConstantAggregateZero>(Op) || isa<UndefValue>(Op)) {
3516 printConstant(cast<ConstantVector>(Op)->getOperand(SrcVal &
3525 void CWriter::visitInsertValueInst(InsertValueInst &IVI) {
3526 // Start by copying the entire aggregate value into the result variable.
3527 writeOperand(IVI.getOperand(0));
3530 // Then do the insert to update the field.
3531 Out << GetValueName(&IVI);
3532 for (const unsigned *b = IVI.idx_begin(), *i = b, *e = IVI.idx_end();
3534 const Type *IndexedTy =
3535 ExtractValueInst::getIndexedType(IVI.getOperand(0)->getType(), b, i+1);
3536 if (IndexedTy->isArrayTy())
3537 Out << ".array[" << *i << "]";
3539 Out << ".field" << *i;
3542 writeOperand(IVI.getOperand(1));
3545 void CWriter::visitExtractValueInst(ExtractValueInst &EVI) {
3547 if (isa<UndefValue>(EVI.getOperand(0))) {
3549 printType(Out, EVI.getType());
3550 Out << ") 0/*UNDEF*/";
3552 Out << GetValueName(EVI.getOperand(0));
3553 for (const unsigned *b = EVI.idx_begin(), *i = b, *e = EVI.idx_end();
3555 const Type *IndexedTy =
3556 ExtractValueInst::getIndexedType(EVI.getOperand(0)->getType(), b, i+1);
3557 if (IndexedTy->isArrayTy())
3558 Out << ".array[" << *i << "]";
3560 Out << ".field" << *i;
3566 //===----------------------------------------------------------------------===//
3567 // External Interface declaration
3568 //===----------------------------------------------------------------------===//
3570 bool CTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
3571 formatted_raw_ostream &o,
3572 CodeGenFileType FileType,
3573 CodeGenOpt::Level OptLevel,
3574 bool DisableVerify) {
3575 if (FileType != TargetMachine::CGFT_AssemblyFile) return true;
3577 PM.add(createGCLoweringPass());
3578 PM.add(createLowerInvokePass());
3579 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
3580 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
3581 PM.add(new CWriter(o));
3582 PM.add(createGCInfoDeleter());