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::VectorTyID: {
519 const VectorType *VTy = cast<VectorType>(Ty);
520 return printSimpleType(Out, VTy->getElementType(), isSigned,
521 " __attribute__((vector_size(" +
522 utostr(TD->getTypeAllocSize(VTy)) + " ))) " + NameSoFar);
527 errs() << "Unknown primitive type: " << *Ty << "\n";
533 // Pass the Type* and the variable name and this prints out the variable
536 raw_ostream &CWriter::printType(raw_ostream &Out, const Type *Ty,
537 bool isSigned, const std::string &NameSoFar,
538 bool IgnoreName, const AttrListPtr &PAL) {
539 if (Ty->isPrimitiveType() || Ty->isIntegerTy() || Ty->isVectorTy()) {
540 printSimpleType(Out, Ty, isSigned, NameSoFar);
544 // Check to see if the type is named.
545 if (!IgnoreName || Ty->isOpaqueTy()) {
546 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
547 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
550 switch (Ty->getTypeID()) {
551 case Type::FunctionTyID: {
552 const FunctionType *FTy = cast<FunctionType>(Ty);
554 raw_string_ostream FunctionInnards(tstr);
555 FunctionInnards << " (" << NameSoFar << ") (";
557 for (FunctionType::param_iterator I = FTy->param_begin(),
558 E = FTy->param_end(); I != E; ++I) {
559 const Type *ArgTy = *I;
560 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
561 assert(ArgTy->isPointerTy());
562 ArgTy = cast<PointerType>(ArgTy)->getElementType();
564 if (I != FTy->param_begin())
565 FunctionInnards << ", ";
566 printType(FunctionInnards, ArgTy,
567 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt), "");
570 if (FTy->isVarArg()) {
571 if (!FTy->getNumParams())
572 FunctionInnards << " int"; //dummy argument for empty vaarg functs
573 FunctionInnards << ", ...";
574 } else if (!FTy->getNumParams()) {
575 FunctionInnards << "void";
577 FunctionInnards << ')';
578 printType(Out, FTy->getReturnType(),
579 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt), FunctionInnards.str());
582 case Type::StructTyID: {
583 const StructType *STy = cast<StructType>(Ty);
584 Out << NameSoFar + " {\n";
586 for (StructType::element_iterator I = STy->element_begin(),
587 E = STy->element_end(); I != E; ++I) {
589 printType(Out, *I, false, "field" + utostr(Idx++));
594 Out << " __attribute__ ((packed))";
598 case Type::PointerTyID: {
599 const PointerType *PTy = cast<PointerType>(Ty);
600 std::string ptrName = "*" + NameSoFar;
602 if (PTy->getElementType()->isArrayTy() ||
603 PTy->getElementType()->isVectorTy())
604 ptrName = "(" + ptrName + ")";
607 // Must be a function ptr cast!
608 return printType(Out, PTy->getElementType(), false, ptrName, true, PAL);
609 return printType(Out, PTy->getElementType(), false, ptrName);
612 case Type::ArrayTyID: {
613 const ArrayType *ATy = cast<ArrayType>(Ty);
614 unsigned NumElements = ATy->getNumElements();
615 if (NumElements == 0) NumElements = 1;
616 // Arrays are wrapped in structs to allow them to have normal
617 // value semantics (avoiding the array "decay").
618 Out << NameSoFar << " { ";
619 printType(Out, ATy->getElementType(), false,
620 "array[" + utostr(NumElements) + "]");
624 case Type::OpaqueTyID: {
625 std::string TyName = "struct opaque_" + itostr(OpaqueCounter++);
626 assert(TypeNames.find(Ty) == TypeNames.end());
627 TypeNames[Ty] = TyName;
628 return Out << TyName << ' ' << NameSoFar;
631 llvm_unreachable("Unhandled case in getTypeProps!");
637 void CWriter::printConstantArray(ConstantArray *CPA, bool Static) {
639 // As a special case, print the array as a string if it is an array of
640 // ubytes or an array of sbytes with positive values.
642 const Type *ETy = CPA->getType()->getElementType();
643 bool isString = (ETy == Type::getInt8Ty(CPA->getContext()) ||
644 ETy == Type::getInt8Ty(CPA->getContext()));
646 // Make sure the last character is a null char, as automatically added by C
647 if (isString && (CPA->getNumOperands() == 0 ||
648 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
653 // Keep track of whether the last number was a hexadecimal escape
654 bool LastWasHex = false;
656 // Do not include the last character, which we know is null
657 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
658 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
660 // Print it out literally if it is a printable character. The only thing
661 // to be careful about is when the last letter output was a hex escape
662 // code, in which case we have to be careful not to print out hex digits
663 // explicitly (the C compiler thinks it is a continuation of the previous
664 // character, sheesh...)
666 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
668 if (C == '"' || C == '\\')
669 Out << "\\" << (char)C;
675 case '\n': Out << "\\n"; break;
676 case '\t': Out << "\\t"; break;
677 case '\r': Out << "\\r"; break;
678 case '\v': Out << "\\v"; break;
679 case '\a': Out << "\\a"; break;
680 case '\"': Out << "\\\""; break;
681 case '\'': Out << "\\\'"; break;
684 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
685 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
694 if (CPA->getNumOperands()) {
696 printConstant(cast<Constant>(CPA->getOperand(0)), Static);
697 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
699 printConstant(cast<Constant>(CPA->getOperand(i)), Static);
706 void CWriter::printConstantVector(ConstantVector *CP, bool Static) {
708 if (CP->getNumOperands()) {
710 printConstant(cast<Constant>(CP->getOperand(0)), Static);
711 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
713 printConstant(cast<Constant>(CP->getOperand(i)), Static);
719 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
720 // textually as a double (rather than as a reference to a stack-allocated
721 // variable). We decide this by converting CFP to a string and back into a
722 // double, and then checking whether the conversion results in a bit-equal
723 // double to the original value of CFP. This depends on us and the target C
724 // compiler agreeing on the conversion process (which is pretty likely since we
725 // only deal in IEEE FP).
727 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
729 // Do long doubles in hex for now.
730 if (CFP->getType() != Type::getFloatTy(CFP->getContext()) &&
731 CFP->getType() != Type::getDoubleTy(CFP->getContext()))
733 APFloat APF = APFloat(CFP->getValueAPF()); // copy
734 if (CFP->getType() == Type::getFloatTy(CFP->getContext()))
735 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &ignored);
736 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
738 sprintf(Buffer, "%a", APF.convertToDouble());
739 if (!strncmp(Buffer, "0x", 2) ||
740 !strncmp(Buffer, "-0x", 3) ||
741 !strncmp(Buffer, "+0x", 3))
742 return APF.bitwiseIsEqual(APFloat(atof(Buffer)));
745 std::string StrVal = ftostr(APF);
747 while (StrVal[0] == ' ')
748 StrVal.erase(StrVal.begin());
750 // Check to make sure that the stringized number is not some string like "Inf"
751 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
752 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
753 ((StrVal[0] == '-' || StrVal[0] == '+') &&
754 (StrVal[1] >= '0' && StrVal[1] <= '9')))
755 // Reparse stringized version!
756 return APF.bitwiseIsEqual(APFloat(atof(StrVal.c_str())));
761 /// Print out the casting for a cast operation. This does the double casting
762 /// necessary for conversion to the destination type, if necessary.
763 /// @brief Print a cast
764 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
765 // Print the destination type cast
767 case Instruction::UIToFP:
768 case Instruction::SIToFP:
769 case Instruction::IntToPtr:
770 case Instruction::Trunc:
771 case Instruction::BitCast:
772 case Instruction::FPExt:
773 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
775 printType(Out, DstTy);
778 case Instruction::ZExt:
779 case Instruction::PtrToInt:
780 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
782 printSimpleType(Out, DstTy, false);
785 case Instruction::SExt:
786 case Instruction::FPToSI: // For these, make sure we get a signed dest
788 printSimpleType(Out, DstTy, true);
792 llvm_unreachable("Invalid cast opcode");
795 // Print the source type cast
797 case Instruction::UIToFP:
798 case Instruction::ZExt:
800 printSimpleType(Out, SrcTy, false);
803 case Instruction::SIToFP:
804 case Instruction::SExt:
806 printSimpleType(Out, SrcTy, true);
809 case Instruction::IntToPtr:
810 case Instruction::PtrToInt:
811 // Avoid "cast to pointer from integer of different size" warnings
812 Out << "(unsigned long)";
814 case Instruction::Trunc:
815 case Instruction::BitCast:
816 case Instruction::FPExt:
817 case Instruction::FPTrunc:
818 case Instruction::FPToSI:
819 case Instruction::FPToUI:
820 break; // These don't need a source cast.
822 llvm_unreachable("Invalid cast opcode");
827 // printConstant - The LLVM Constant to C Constant converter.
828 void CWriter::printConstant(Constant *CPV, bool Static) {
829 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
830 switch (CE->getOpcode()) {
831 case Instruction::Trunc:
832 case Instruction::ZExt:
833 case Instruction::SExt:
834 case Instruction::FPTrunc:
835 case Instruction::FPExt:
836 case Instruction::UIToFP:
837 case Instruction::SIToFP:
838 case Instruction::FPToUI:
839 case Instruction::FPToSI:
840 case Instruction::PtrToInt:
841 case Instruction::IntToPtr:
842 case Instruction::BitCast:
844 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
845 if (CE->getOpcode() == Instruction::SExt &&
846 CE->getOperand(0)->getType() == Type::getInt1Ty(CPV->getContext())) {
847 // Make sure we really sext from bool here by subtracting from 0
850 printConstant(CE->getOperand(0), Static);
851 if (CE->getType() == Type::getInt1Ty(CPV->getContext()) &&
852 (CE->getOpcode() == Instruction::Trunc ||
853 CE->getOpcode() == Instruction::FPToUI ||
854 CE->getOpcode() == Instruction::FPToSI ||
855 CE->getOpcode() == Instruction::PtrToInt)) {
856 // Make sure we really truncate to bool here by anding with 1
862 case Instruction::GetElementPtr:
864 printGEPExpression(CE->getOperand(0), gep_type_begin(CPV),
865 gep_type_end(CPV), Static);
868 case Instruction::Select:
870 printConstant(CE->getOperand(0), Static);
872 printConstant(CE->getOperand(1), Static);
874 printConstant(CE->getOperand(2), Static);
877 case Instruction::Add:
878 case Instruction::FAdd:
879 case Instruction::Sub:
880 case Instruction::FSub:
881 case Instruction::Mul:
882 case Instruction::FMul:
883 case Instruction::SDiv:
884 case Instruction::UDiv:
885 case Instruction::FDiv:
886 case Instruction::URem:
887 case Instruction::SRem:
888 case Instruction::FRem:
889 case Instruction::And:
890 case Instruction::Or:
891 case Instruction::Xor:
892 case Instruction::ICmp:
893 case Instruction::Shl:
894 case Instruction::LShr:
895 case Instruction::AShr:
898 bool NeedsClosingParens = printConstExprCast(CE, Static);
899 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
900 switch (CE->getOpcode()) {
901 case Instruction::Add:
902 case Instruction::FAdd: Out << " + "; break;
903 case Instruction::Sub:
904 case Instruction::FSub: Out << " - "; break;
905 case Instruction::Mul:
906 case Instruction::FMul: Out << " * "; break;
907 case Instruction::URem:
908 case Instruction::SRem:
909 case Instruction::FRem: Out << " % "; break;
910 case Instruction::UDiv:
911 case Instruction::SDiv:
912 case Instruction::FDiv: Out << " / "; break;
913 case Instruction::And: Out << " & "; break;
914 case Instruction::Or: Out << " | "; break;
915 case Instruction::Xor: Out << " ^ "; break;
916 case Instruction::Shl: Out << " << "; break;
917 case Instruction::LShr:
918 case Instruction::AShr: Out << " >> "; break;
919 case Instruction::ICmp:
920 switch (CE->getPredicate()) {
921 case ICmpInst::ICMP_EQ: Out << " == "; break;
922 case ICmpInst::ICMP_NE: Out << " != "; break;
923 case ICmpInst::ICMP_SLT:
924 case ICmpInst::ICMP_ULT: Out << " < "; break;
925 case ICmpInst::ICMP_SLE:
926 case ICmpInst::ICMP_ULE: Out << " <= "; break;
927 case ICmpInst::ICMP_SGT:
928 case ICmpInst::ICMP_UGT: Out << " > "; break;
929 case ICmpInst::ICMP_SGE:
930 case ICmpInst::ICMP_UGE: Out << " >= "; break;
931 default: llvm_unreachable("Illegal ICmp predicate");
934 default: llvm_unreachable("Illegal opcode here!");
936 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
937 if (NeedsClosingParens)
942 case Instruction::FCmp: {
944 bool NeedsClosingParens = printConstExprCast(CE, Static);
945 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
947 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
951 switch (CE->getPredicate()) {
952 default: llvm_unreachable("Illegal FCmp predicate");
953 case FCmpInst::FCMP_ORD: op = "ord"; break;
954 case FCmpInst::FCMP_UNO: op = "uno"; break;
955 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
956 case FCmpInst::FCMP_UNE: op = "une"; break;
957 case FCmpInst::FCMP_ULT: op = "ult"; break;
958 case FCmpInst::FCMP_ULE: op = "ule"; break;
959 case FCmpInst::FCMP_UGT: op = "ugt"; break;
960 case FCmpInst::FCMP_UGE: op = "uge"; break;
961 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
962 case FCmpInst::FCMP_ONE: op = "one"; break;
963 case FCmpInst::FCMP_OLT: op = "olt"; break;
964 case FCmpInst::FCMP_OLE: op = "ole"; break;
965 case FCmpInst::FCMP_OGT: op = "ogt"; break;
966 case FCmpInst::FCMP_OGE: op = "oge"; break;
968 Out << "llvm_fcmp_" << op << "(";
969 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
971 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
974 if (NeedsClosingParens)
981 errs() << "CWriter Error: Unhandled constant expression: "
986 } else if (isa<UndefValue>(CPV) && CPV->getType()->isSingleValueType()) {
988 printType(Out, CPV->getType()); // sign doesn't matter
990 if (!CPV->getType()->isVectorTy()) {
998 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
999 const Type* Ty = CI->getType();
1000 if (Ty == Type::getInt1Ty(CPV->getContext()))
1001 Out << (CI->getZExtValue() ? '1' : '0');
1002 else if (Ty == Type::getInt32Ty(CPV->getContext()))
1003 Out << CI->getZExtValue() << 'u';
1004 else if (Ty->getPrimitiveSizeInBits() > 32)
1005 Out << CI->getZExtValue() << "ull";
1008 printSimpleType(Out, Ty, false) << ')';
1009 if (CI->isMinValue(true))
1010 Out << CI->getZExtValue() << 'u';
1012 Out << CI->getSExtValue();
1018 switch (CPV->getType()->getTypeID()) {
1019 case Type::FloatTyID:
1020 case Type::DoubleTyID:
1021 case Type::X86_FP80TyID:
1022 case Type::PPC_FP128TyID:
1023 case Type::FP128TyID: {
1024 ConstantFP *FPC = cast<ConstantFP>(CPV);
1025 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
1026 if (I != FPConstantMap.end()) {
1027 // Because of FP precision problems we must load from a stack allocated
1028 // value that holds the value in hex.
1029 Out << "(*(" << (FPC->getType() == Type::getFloatTy(CPV->getContext()) ?
1031 FPC->getType() == Type::getDoubleTy(CPV->getContext()) ?
1034 << "*)&FPConstant" << I->second << ')';
1037 if (FPC->getType() == Type::getFloatTy(CPV->getContext()))
1038 V = FPC->getValueAPF().convertToFloat();
1039 else if (FPC->getType() == Type::getDoubleTy(CPV->getContext()))
1040 V = FPC->getValueAPF().convertToDouble();
1042 // Long double. Convert the number to double, discarding precision.
1043 // This is not awesome, but it at least makes the CBE output somewhat
1045 APFloat Tmp = FPC->getValueAPF();
1047 Tmp.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &LosesInfo);
1048 V = Tmp.convertToDouble();
1054 // FIXME the actual NaN bits should be emitted.
1055 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
1057 const unsigned long QuietNaN = 0x7ff8UL;
1058 //const unsigned long SignalNaN = 0x7ff4UL;
1060 // We need to grab the first part of the FP #
1063 uint64_t ll = DoubleToBits(V);
1064 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
1066 std::string Num(&Buffer[0], &Buffer[6]);
1067 unsigned long Val = strtoul(Num.c_str(), 0, 16);
1069 if (FPC->getType() == Type::getFloatTy(FPC->getContext()))
1070 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
1071 << Buffer << "\") /*nan*/ ";
1073 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
1074 << Buffer << "\") /*nan*/ ";
1075 } else if (IsInf(V)) {
1077 if (V < 0) Out << '-';
1078 Out << "LLVM_INF" <<
1079 (FPC->getType() == Type::getFloatTy(FPC->getContext()) ? "F" : "")
1083 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
1084 // Print out the constant as a floating point number.
1086 sprintf(Buffer, "%a", V);
1089 Num = ftostr(FPC->getValueAPF());
1097 case Type::ArrayTyID:
1098 // Use C99 compound expression literal initializer syntax.
1101 printType(Out, CPV->getType());
1104 Out << "{ "; // Arrays are wrapped in struct types.
1105 if (ConstantArray *CA = dyn_cast<ConstantArray>(CPV)) {
1106 printConstantArray(CA, Static);
1108 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1109 const ArrayType *AT = cast<ArrayType>(CPV->getType());
1111 if (AT->getNumElements()) {
1113 Constant *CZ = Constant::getNullValue(AT->getElementType());
1114 printConstant(CZ, Static);
1115 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
1117 printConstant(CZ, Static);
1122 Out << " }"; // Arrays are wrapped in struct types.
1125 case Type::VectorTyID:
1126 // Use C99 compound expression literal initializer syntax.
1129 printType(Out, CPV->getType());
1132 if (ConstantVector *CV = dyn_cast<ConstantVector>(CPV)) {
1133 printConstantVector(CV, Static);
1135 assert(isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV));
1136 const VectorType *VT = cast<VectorType>(CPV->getType());
1138 Constant *CZ = Constant::getNullValue(VT->getElementType());
1139 printConstant(CZ, Static);
1140 for (unsigned i = 1, e = VT->getNumElements(); i != e; ++i) {
1142 printConstant(CZ, Static);
1148 case Type::StructTyID:
1149 // Use C99 compound expression literal initializer syntax.
1152 printType(Out, CPV->getType());
1155 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
1156 const StructType *ST = cast<StructType>(CPV->getType());
1158 if (ST->getNumElements()) {
1160 printConstant(Constant::getNullValue(ST->getElementType(0)), Static);
1161 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
1163 printConstant(Constant::getNullValue(ST->getElementType(i)), Static);
1169 if (CPV->getNumOperands()) {
1171 printConstant(cast<Constant>(CPV->getOperand(0)), Static);
1172 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
1174 printConstant(cast<Constant>(CPV->getOperand(i)), Static);
1181 case Type::PointerTyID:
1182 if (isa<ConstantPointerNull>(CPV)) {
1184 printType(Out, CPV->getType()); // sign doesn't matter
1185 Out << ")/*NULL*/0)";
1187 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
1188 writeOperand(GV, Static);
1194 errs() << "Unknown constant type: " << *CPV << "\n";
1196 llvm_unreachable(0);
1200 // Some constant expressions need to be casted back to the original types
1201 // because their operands were casted to the expected type. This function takes
1202 // care of detecting that case and printing the cast for the ConstantExpr.
1203 bool CWriter::printConstExprCast(const ConstantExpr* CE, bool Static) {
1204 bool NeedsExplicitCast = false;
1205 const Type *Ty = CE->getOperand(0)->getType();
1206 bool TypeIsSigned = false;
1207 switch (CE->getOpcode()) {
1208 case Instruction::Add:
1209 case Instruction::Sub:
1210 case Instruction::Mul:
1211 // We need to cast integer arithmetic so that it is always performed
1212 // as unsigned, to avoid undefined behavior on overflow.
1213 case Instruction::LShr:
1214 case Instruction::URem:
1215 case Instruction::UDiv: NeedsExplicitCast = true; break;
1216 case Instruction::AShr:
1217 case Instruction::SRem:
1218 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1219 case Instruction::SExt:
1221 NeedsExplicitCast = true;
1222 TypeIsSigned = true;
1224 case Instruction::ZExt:
1225 case Instruction::Trunc:
1226 case Instruction::FPTrunc:
1227 case Instruction::FPExt:
1228 case Instruction::UIToFP:
1229 case Instruction::SIToFP:
1230 case Instruction::FPToUI:
1231 case Instruction::FPToSI:
1232 case Instruction::PtrToInt:
1233 case Instruction::IntToPtr:
1234 case Instruction::BitCast:
1236 NeedsExplicitCast = true;
1240 if (NeedsExplicitCast) {
1242 if (Ty->isIntegerTy() && Ty != Type::getInt1Ty(Ty->getContext()))
1243 printSimpleType(Out, Ty, TypeIsSigned);
1245 printType(Out, Ty); // not integer, sign doesn't matter
1248 return NeedsExplicitCast;
1251 // Print a constant assuming that it is the operand for a given Opcode. The
1252 // opcodes that care about sign need to cast their operands to the expected
1253 // type before the operation proceeds. This function does the casting.
1254 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1256 // Extract the operand's type, we'll need it.
1257 const Type* OpTy = CPV->getType();
1259 // Indicate whether to do the cast or not.
1260 bool shouldCast = false;
1261 bool typeIsSigned = false;
1263 // Based on the Opcode for which this Constant is being written, determine
1264 // the new type to which the operand should be casted by setting the value
1265 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1269 // for most instructions, it doesn't matter
1271 case Instruction::Add:
1272 case Instruction::Sub:
1273 case Instruction::Mul:
1274 // We need to cast integer arithmetic so that it is always performed
1275 // as unsigned, to avoid undefined behavior on overflow.
1276 case Instruction::LShr:
1277 case Instruction::UDiv:
1278 case Instruction::URem:
1281 case Instruction::AShr:
1282 case Instruction::SDiv:
1283 case Instruction::SRem:
1285 typeIsSigned = true;
1289 // Write out the casted constant if we should, otherwise just write the
1293 printSimpleType(Out, OpTy, typeIsSigned);
1295 printConstant(CPV, false);
1298 printConstant(CPV, false);
1301 std::string CWriter::GetValueName(const Value *Operand) {
1303 // Resolve potential alias.
1304 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(Operand)) {
1305 if (const Value *V = GA->resolveAliasedGlobal(false))
1309 // Mangle globals with the standard mangler interface for LLC compatibility.
1310 if (const GlobalValue *GV = dyn_cast<GlobalValue>(Operand)) {
1311 SmallString<128> Str;
1312 Mang->getNameWithPrefix(Str, GV, false);
1313 return CBEMangle(Str.str().str());
1316 std::string Name = Operand->getName();
1318 if (Name.empty()) { // Assign unique names to local temporaries.
1319 unsigned &No = AnonValueNumbers[Operand];
1321 No = ++NextAnonValueNumber;
1322 Name = "tmp__" + utostr(No);
1325 std::string VarName;
1326 VarName.reserve(Name.capacity());
1328 for (std::string::iterator I = Name.begin(), E = Name.end();
1332 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1333 (ch >= '0' && ch <= '9') || ch == '_')) {
1335 sprintf(buffer, "_%x_", ch);
1341 return "llvm_cbe_" + VarName;
1344 /// writeInstComputationInline - Emit the computation for the specified
1345 /// instruction inline, with no destination provided.
1346 void CWriter::writeInstComputationInline(Instruction &I) {
1347 // We can't currently support integer types other than 1, 8, 16, 32, 64.
1349 const Type *Ty = I.getType();
1350 if (Ty->isIntegerTy() && (Ty!=Type::getInt1Ty(I.getContext()) &&
1351 Ty!=Type::getInt8Ty(I.getContext()) &&
1352 Ty!=Type::getInt16Ty(I.getContext()) &&
1353 Ty!=Type::getInt32Ty(I.getContext()) &&
1354 Ty!=Type::getInt64Ty(I.getContext()))) {
1355 report_fatal_error("The C backend does not currently support integer "
1356 "types of widths other than 1, 8, 16, 32, 64.\n"
1357 "This is being tracked as PR 4158.");
1360 // If this is a non-trivial bool computation, make sure to truncate down to
1361 // a 1 bit value. This is important because we want "add i1 x, y" to return
1362 // "0" when x and y are true, not "2" for example.
1363 bool NeedBoolTrunc = false;
1364 if (I.getType() == Type::getInt1Ty(I.getContext()) &&
1365 !isa<ICmpInst>(I) && !isa<FCmpInst>(I))
1366 NeedBoolTrunc = true;
1378 void CWriter::writeOperandInternal(Value *Operand, bool Static) {
1379 if (Instruction *I = dyn_cast<Instruction>(Operand))
1380 // Should we inline this instruction to build a tree?
1381 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1383 writeInstComputationInline(*I);
1388 Constant* CPV = dyn_cast<Constant>(Operand);
1390 if (CPV && !isa<GlobalValue>(CPV))
1391 printConstant(CPV, Static);
1393 Out << GetValueName(Operand);
1396 void CWriter::writeOperand(Value *Operand, bool Static) {
1397 bool isAddressImplicit = isAddressExposed(Operand);
1398 if (isAddressImplicit)
1399 Out << "(&"; // Global variables are referenced as their addresses by llvm
1401 writeOperandInternal(Operand, Static);
1403 if (isAddressImplicit)
1407 // Some instructions need to have their result value casted back to the
1408 // original types because their operands were casted to the expected type.
1409 // This function takes care of detecting that case and printing the cast
1410 // for the Instruction.
1411 bool CWriter::writeInstructionCast(const Instruction &I) {
1412 const Type *Ty = I.getOperand(0)->getType();
1413 switch (I.getOpcode()) {
1414 case Instruction::Add:
1415 case Instruction::Sub:
1416 case Instruction::Mul:
1417 // We need to cast integer arithmetic so that it is always performed
1418 // as unsigned, to avoid undefined behavior on overflow.
1419 case Instruction::LShr:
1420 case Instruction::URem:
1421 case Instruction::UDiv:
1423 printSimpleType(Out, Ty, false);
1426 case Instruction::AShr:
1427 case Instruction::SRem:
1428 case Instruction::SDiv:
1430 printSimpleType(Out, Ty, true);
1438 // Write the operand with a cast to another type based on the Opcode being used.
1439 // This will be used in cases where an instruction has specific type
1440 // requirements (usually signedness) for its operands.
1441 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1443 // Extract the operand's type, we'll need it.
1444 const Type* OpTy = Operand->getType();
1446 // Indicate whether to do the cast or not.
1447 bool shouldCast = false;
1449 // Indicate whether the cast should be to a signed type or not.
1450 bool castIsSigned = false;
1452 // Based on the Opcode for which this Operand is being written, determine
1453 // the new type to which the operand should be casted by setting the value
1454 // of OpTy. If we change OpTy, also set shouldCast to true.
1457 // for most instructions, it doesn't matter
1459 case Instruction::Add:
1460 case Instruction::Sub:
1461 case Instruction::Mul:
1462 // We need to cast integer arithmetic so that it is always performed
1463 // as unsigned, to avoid undefined behavior on overflow.
1464 case Instruction::LShr:
1465 case Instruction::UDiv:
1466 case Instruction::URem: // Cast to unsigned first
1468 castIsSigned = false;
1470 case Instruction::GetElementPtr:
1471 case Instruction::AShr:
1472 case Instruction::SDiv:
1473 case Instruction::SRem: // Cast to signed first
1475 castIsSigned = true;
1479 // Write out the casted operand if we should, otherwise just write the
1483 printSimpleType(Out, OpTy, castIsSigned);
1485 writeOperand(Operand);
1488 writeOperand(Operand);
1491 // Write the operand with a cast to another type based on the icmp predicate
1493 void CWriter::writeOperandWithCast(Value* Operand, const ICmpInst &Cmp) {
1494 // This has to do a cast to ensure the operand has the right signedness.
1495 // Also, if the operand is a pointer, we make sure to cast to an integer when
1496 // doing the comparison both for signedness and so that the C compiler doesn't
1497 // optimize things like "p < NULL" to false (p may contain an integer value
1499 bool shouldCast = Cmp.isRelational();
1501 // Write out the casted operand if we should, otherwise just write the
1504 writeOperand(Operand);
1508 // Should this be a signed comparison? If so, convert to signed.
1509 bool castIsSigned = Cmp.isSigned();
1511 // If the operand was a pointer, convert to a large integer type.
1512 const Type* OpTy = Operand->getType();
1513 if (OpTy->isPointerTy())
1514 OpTy = TD->getIntPtrType(Operand->getContext());
1517 printSimpleType(Out, OpTy, castIsSigned);
1519 writeOperand(Operand);
1523 // generateCompilerSpecificCode - This is where we add conditional compilation
1524 // directives to cater to specific compilers as need be.
1526 static void generateCompilerSpecificCode(formatted_raw_ostream& Out,
1527 const TargetData *TD) {
1528 // Alloca is hard to get, and we don't want to include stdlib.h here.
1529 Out << "/* get a declaration for alloca */\n"
1530 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1531 << "#define alloca(x) __builtin_alloca((x))\n"
1532 << "#define _alloca(x) __builtin_alloca((x))\n"
1533 << "#elif defined(__APPLE__)\n"
1534 << "extern void *__builtin_alloca(unsigned long);\n"
1535 << "#define alloca(x) __builtin_alloca(x)\n"
1536 << "#define longjmp _longjmp\n"
1537 << "#define setjmp _setjmp\n"
1538 << "#elif defined(__sun__)\n"
1539 << "#if defined(__sparcv9)\n"
1540 << "extern void *__builtin_alloca(unsigned long);\n"
1542 << "extern void *__builtin_alloca(unsigned int);\n"
1544 << "#define alloca(x) __builtin_alloca(x)\n"
1545 << "#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__arm__)\n"
1546 << "#define alloca(x) __builtin_alloca(x)\n"
1547 << "#elif defined(_MSC_VER)\n"
1548 << "#define inline _inline\n"
1549 << "#define alloca(x) _alloca(x)\n"
1551 << "#include <alloca.h>\n"
1554 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1555 // If we aren't being compiled with GCC, just drop these attributes.
1556 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1557 << "#define __attribute__(X)\n"
1560 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1561 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1562 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1563 << "#elif defined(__GNUC__)\n"
1564 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1566 << "#define __EXTERNAL_WEAK__\n"
1569 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1570 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1571 << "#define __ATTRIBUTE_WEAK__\n"
1572 << "#elif defined(__GNUC__)\n"
1573 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1575 << "#define __ATTRIBUTE_WEAK__\n"
1578 // Add hidden visibility support. FIXME: APPLE_CC?
1579 Out << "#if defined(__GNUC__)\n"
1580 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1583 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1584 // From the GCC documentation:
1586 // double __builtin_nan (const char *str)
1588 // This is an implementation of the ISO C99 function nan.
1590 // Since ISO C99 defines this function in terms of strtod, which we do
1591 // not implement, a description of the parsing is in order. The string is
1592 // parsed as by strtol; that is, the base is recognized by leading 0 or
1593 // 0x prefixes. The number parsed is placed in the significand such that
1594 // the least significant bit of the number is at the least significant
1595 // bit of the significand. The number is truncated to fit the significand
1596 // field provided. The significand is forced to be a quiet NaN.
1598 // This function, if given a string literal, is evaluated early enough
1599 // that it is considered a compile-time constant.
1601 // float __builtin_nanf (const char *str)
1603 // Similar to __builtin_nan, except the return type is float.
1605 // double __builtin_inf (void)
1607 // Similar to __builtin_huge_val, except a warning is generated if the
1608 // target floating-point format does not support infinities. This
1609 // function is suitable for implementing the ISO C99 macro INFINITY.
1611 // float __builtin_inff (void)
1613 // Similar to __builtin_inf, except the return type is float.
1614 Out << "#ifdef __GNUC__\n"
1615 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1616 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1617 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1618 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1619 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1620 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1621 << "#define LLVM_PREFETCH(addr,rw,locality) "
1622 "__builtin_prefetch(addr,rw,locality)\n"
1623 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1624 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1625 << "#define LLVM_ASM __asm__\n"
1627 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1628 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1629 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1630 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1631 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1632 << "#define LLVM_INFF 0.0F /* Float */\n"
1633 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1634 << "#define __ATTRIBUTE_CTOR__\n"
1635 << "#define __ATTRIBUTE_DTOR__\n"
1636 << "#define LLVM_ASM(X)\n"
1639 Out << "#if __GNUC__ < 4 /* Old GCC's, or compilers not GCC */ \n"
1640 << "#define __builtin_stack_save() 0 /* not implemented */\n"
1641 << "#define __builtin_stack_restore(X) /* noop */\n"
1644 // Output typedefs for 128-bit integers. If these are needed with a
1645 // 32-bit target or with a C compiler that doesn't support mode(TI),
1646 // more drastic measures will be needed.
1647 Out << "#if __GNUC__ && __LP64__ /* 128-bit integer types */\n"
1648 << "typedef int __attribute__((mode(TI))) llvmInt128;\n"
1649 << "typedef unsigned __attribute__((mode(TI))) llvmUInt128;\n"
1652 // Output target-specific code that should be inserted into main.
1653 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1656 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1657 /// the StaticTors set.
1658 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1659 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1660 if (!InitList) return;
1662 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1663 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1664 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1666 if (CS->getOperand(1)->isNullValue())
1667 return; // Found a null terminator, exit printing.
1668 Constant *FP = CS->getOperand(1);
1669 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1671 FP = CE->getOperand(0);
1672 if (Function *F = dyn_cast<Function>(FP))
1673 StaticTors.insert(F);
1677 enum SpecialGlobalClass {
1679 GlobalCtors, GlobalDtors,
1683 /// getGlobalVariableClass - If this is a global that is specially recognized
1684 /// by LLVM, return a code that indicates how we should handle it.
1685 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1686 // If this is a global ctors/dtors list, handle it now.
1687 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1688 if (GV->getName() == "llvm.global_ctors")
1690 else if (GV->getName() == "llvm.global_dtors")
1694 // Otherwise, if it is other metadata, don't print it. This catches things
1695 // like debug information.
1696 if (GV->getSection() == "llvm.metadata")
1702 // PrintEscapedString - Print each character of the specified string, escaping
1703 // it if it is not printable or if it is an escape char.
1704 static void PrintEscapedString(const char *Str, unsigned Length,
1706 for (unsigned i = 0; i != Length; ++i) {
1707 unsigned char C = Str[i];
1708 if (isprint(C) && C != '\\' && C != '"')
1717 Out << "\\x" << hexdigit(C >> 4) << hexdigit(C & 0x0F);
1721 // PrintEscapedString - Print each character of the specified string, escaping
1722 // it if it is not printable or if it is an escape char.
1723 static void PrintEscapedString(const std::string &Str, raw_ostream &Out) {
1724 PrintEscapedString(Str.c_str(), Str.size(), Out);
1727 bool CWriter::doInitialization(Module &M) {
1728 FunctionPass::doInitialization(M);
1733 TD = new TargetData(&M);
1734 IL = new IntrinsicLowering(*TD);
1735 IL->AddPrototypes(M);
1738 std::string Triple = TheModule->getTargetTriple();
1740 Triple = llvm::sys::getHostTriple();
1743 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
1744 TAsm = Match->createAsmInfo(Triple);
1746 TAsm = new CBEMCAsmInfo();
1747 TCtx = new MCContext(*TAsm);
1748 Mang = new Mangler(*TCtx, *TD);
1750 // Keep track of which functions are static ctors/dtors so they can have
1751 // an attribute added to their prototypes.
1752 std::set<Function*> StaticCtors, StaticDtors;
1753 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1755 switch (getGlobalVariableClass(I)) {
1758 FindStaticTors(I, StaticCtors);
1761 FindStaticTors(I, StaticDtors);
1766 // get declaration for alloca
1767 Out << "/* Provide Declarations */\n";
1768 Out << "#include <stdarg.h>\n"; // Varargs support
1769 Out << "#include <setjmp.h>\n"; // Unwind support
1770 generateCompilerSpecificCode(Out, TD);
1772 // Provide a definition for `bool' if not compiling with a C++ compiler.
1774 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1776 << "\n\n/* Support for floating point constants */\n"
1777 << "typedef unsigned long long ConstantDoubleTy;\n"
1778 << "typedef unsigned int ConstantFloatTy;\n"
1779 << "typedef struct { unsigned long long f1; unsigned short f2; "
1780 "unsigned short pad[3]; } ConstantFP80Ty;\n"
1781 // This is used for both kinds of 128-bit long double; meaning differs.
1782 << "typedef struct { unsigned long long f1; unsigned long long f2; }"
1783 " ConstantFP128Ty;\n"
1784 << "\n\n/* Global Declarations */\n";
1786 // First output all the declarations for the program, because C requires
1787 // Functions & globals to be declared before they are used.
1789 if (!M.getModuleInlineAsm().empty()) {
1790 Out << "/* Module asm statements */\n"
1793 // Split the string into lines, to make it easier to read the .ll file.
1794 std::string Asm = M.getModuleInlineAsm();
1796 size_t NewLine = Asm.find_first_of('\n', CurPos);
1797 while (NewLine != std::string::npos) {
1798 // We found a newline, print the portion of the asm string from the
1799 // last newline up to this newline.
1801 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.begin()+NewLine),
1805 NewLine = Asm.find_first_of('\n', CurPos);
1808 PrintEscapedString(std::string(Asm.begin()+CurPos, Asm.end()), Out);
1810 << "/* End Module asm statements */\n";
1813 // Loop over the symbol table, emitting all named constants...
1814 printModuleTypes(M.getTypeSymbolTable());
1816 // Global variable declarations...
1817 if (!M.global_empty()) {
1818 Out << "\n/* External Global Variable Declarations */\n";
1819 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1822 if (I->hasExternalLinkage() || I->hasExternalWeakLinkage() ||
1823 I->hasCommonLinkage())
1825 else if (I->hasDLLImportLinkage())
1826 Out << "__declspec(dllimport) ";
1828 continue; // Internal Global
1830 // Thread Local Storage
1831 if (I->isThreadLocal())
1834 printType(Out, I->getType()->getElementType(), false, GetValueName(I));
1836 if (I->hasExternalWeakLinkage())
1837 Out << " __EXTERNAL_WEAK__";
1842 // Function declarations
1843 Out << "\n/* Function Declarations */\n";
1844 Out << "double fmod(double, double);\n"; // Support for FP rem
1845 Out << "float fmodf(float, float);\n";
1846 Out << "long double fmodl(long double, long double);\n";
1848 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1849 // Don't print declarations for intrinsic functions.
1850 if (!I->isIntrinsic() && I->getName() != "setjmp" &&
1851 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1852 if (I->hasExternalWeakLinkage())
1854 printFunctionSignature(I, true);
1855 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1856 Out << " __ATTRIBUTE_WEAK__";
1857 if (I->hasExternalWeakLinkage())
1858 Out << " __EXTERNAL_WEAK__";
1859 if (StaticCtors.count(I))
1860 Out << " __ATTRIBUTE_CTOR__";
1861 if (StaticDtors.count(I))
1862 Out << " __ATTRIBUTE_DTOR__";
1863 if (I->hasHiddenVisibility())
1864 Out << " __HIDDEN__";
1866 if (I->hasName() && I->getName()[0] == 1)
1867 Out << " LLVM_ASM(\"" << I->getName().substr(1) << "\")";
1873 // Output the global variable declarations
1874 if (!M.global_empty()) {
1875 Out << "\n\n/* Global Variable Declarations */\n";
1876 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1878 if (!I->isDeclaration()) {
1879 // Ignore special globals, such as debug info.
1880 if (getGlobalVariableClass(I))
1883 if (I->hasLocalLinkage())
1888 // Thread Local Storage
1889 if (I->isThreadLocal())
1892 printType(Out, I->getType()->getElementType(), false,
1895 if (I->hasLinkOnceLinkage())
1896 Out << " __attribute__((common))";
1897 else if (I->hasCommonLinkage()) // FIXME is this right?
1898 Out << " __ATTRIBUTE_WEAK__";
1899 else if (I->hasWeakLinkage())
1900 Out << " __ATTRIBUTE_WEAK__";
1901 else if (I->hasExternalWeakLinkage())
1902 Out << " __EXTERNAL_WEAK__";
1903 if (I->hasHiddenVisibility())
1904 Out << " __HIDDEN__";
1909 // Output the global variable definitions and contents...
1910 if (!M.global_empty()) {
1911 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1912 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1914 if (!I->isDeclaration()) {
1915 // Ignore special globals, such as debug info.
1916 if (getGlobalVariableClass(I))
1919 if (I->hasLocalLinkage())
1921 else if (I->hasDLLImportLinkage())
1922 Out << "__declspec(dllimport) ";
1923 else if (I->hasDLLExportLinkage())
1924 Out << "__declspec(dllexport) ";
1926 // Thread Local Storage
1927 if (I->isThreadLocal())
1930 printType(Out, I->getType()->getElementType(), false,
1932 if (I->hasLinkOnceLinkage())
1933 Out << " __attribute__((common))";
1934 else if (I->hasWeakLinkage())
1935 Out << " __ATTRIBUTE_WEAK__";
1936 else if (I->hasCommonLinkage())
1937 Out << " __ATTRIBUTE_WEAK__";
1939 if (I->hasHiddenVisibility())
1940 Out << " __HIDDEN__";
1942 // If the initializer is not null, emit the initializer. If it is null,
1943 // we try to avoid emitting large amounts of zeros. The problem with
1944 // this, however, occurs when the variable has weak linkage. In this
1945 // case, the assembler will complain about the variable being both weak
1946 // and common, so we disable this optimization.
1947 // FIXME common linkage should avoid this problem.
1948 if (!I->getInitializer()->isNullValue()) {
1950 writeOperand(I->getInitializer(), true);
1951 } else if (I->hasWeakLinkage()) {
1952 // We have to specify an initializer, but it doesn't have to be
1953 // complete. If the value is an aggregate, print out { 0 }, and let
1954 // the compiler figure out the rest of the zeros.
1956 if (I->getInitializer()->getType()->isStructTy() ||
1957 I->getInitializer()->getType()->isVectorTy()) {
1959 } else if (I->getInitializer()->getType()->isArrayTy()) {
1960 // As with structs and vectors, but with an extra set of braces
1961 // because arrays are wrapped in structs.
1964 // Just print it out normally.
1965 writeOperand(I->getInitializer(), true);
1973 Out << "\n\n/* Function Bodies */\n";
1975 // Emit some helper functions for dealing with FCMP instruction's
1977 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1978 Out << "return X == X && Y == Y; }\n";
1979 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1980 Out << "return X != X || Y != Y; }\n";
1981 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1982 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1983 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1984 Out << "return X != Y; }\n";
1985 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1986 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1987 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1988 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1989 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1990 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1991 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1992 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1993 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1994 Out << "return X == Y ; }\n";
1995 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1996 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1997 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1998 Out << "return X < Y ; }\n";
1999 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
2000 Out << "return X > Y ; }\n";
2001 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
2002 Out << "return X <= Y ; }\n";
2003 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
2004 Out << "return X >= Y ; }\n";
2009 /// Output all floating point constants that cannot be printed accurately...
2010 void CWriter::printFloatingPointConstants(Function &F) {
2011 // Scan the module for floating point constants. If any FP constant is used
2012 // in the function, we want to redirect it here so that we do not depend on
2013 // the precision of the printed form, unless the printed form preserves
2016 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
2018 printFloatingPointConstants(*I);
2023 void CWriter::printFloatingPointConstants(const Constant *C) {
2024 // If this is a constant expression, recursively check for constant fp values.
2025 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
2026 for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
2027 printFloatingPointConstants(CE->getOperand(i));
2031 // Otherwise, check for a FP constant that we need to print.
2032 const ConstantFP *FPC = dyn_cast<ConstantFP>(C);
2034 // Do not put in FPConstantMap if safe.
2035 isFPCSafeToPrint(FPC) ||
2036 // Already printed this constant?
2037 FPConstantMap.count(FPC))
2040 FPConstantMap[FPC] = FPCounter; // Number the FP constants
2042 if (FPC->getType() == Type::getDoubleTy(FPC->getContext())) {
2043 double Val = FPC->getValueAPF().convertToDouble();
2044 uint64_t i = FPC->getValueAPF().bitcastToAPInt().getZExtValue();
2045 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
2046 << " = 0x" << utohexstr(i)
2047 << "ULL; /* " << Val << " */\n";
2048 } else if (FPC->getType() == Type::getFloatTy(FPC->getContext())) {
2049 float Val = FPC->getValueAPF().convertToFloat();
2050 uint32_t i = (uint32_t)FPC->getValueAPF().bitcastToAPInt().
2052 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
2053 << " = 0x" << utohexstr(i)
2054 << "U; /* " << Val << " */\n";
2055 } else if (FPC->getType() == Type::getX86_FP80Ty(FPC->getContext())) {
2056 // api needed to prevent premature destruction
2057 APInt api = FPC->getValueAPF().bitcastToAPInt();
2058 const uint64_t *p = api.getRawData();
2059 Out << "static const ConstantFP80Ty FPConstant" << FPCounter++
2060 << " = { 0x" << utohexstr(p[0])
2061 << "ULL, 0x" << utohexstr((uint16_t)p[1]) << ",{0,0,0}"
2062 << "}; /* Long double constant */\n";
2063 } else if (FPC->getType() == Type::getPPC_FP128Ty(FPC->getContext()) ||
2064 FPC->getType() == Type::getFP128Ty(FPC->getContext())) {
2065 APInt api = FPC->getValueAPF().bitcastToAPInt();
2066 const uint64_t *p = api.getRawData();
2067 Out << "static const ConstantFP128Ty FPConstant" << FPCounter++
2069 << utohexstr(p[0]) << ", 0x" << utohexstr(p[1])
2070 << "}; /* Long double constant */\n";
2073 llvm_unreachable("Unknown float type!");
2079 /// printSymbolTable - Run through symbol table looking for type names. If a
2080 /// type name is found, emit its declaration...
2082 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
2083 Out << "/* Helper union for bitcasts */\n";
2084 Out << "typedef union {\n";
2085 Out << " unsigned int Int32;\n";
2086 Out << " unsigned long long Int64;\n";
2087 Out << " float Float;\n";
2088 Out << " double Double;\n";
2089 Out << "} llvmBitCastUnion;\n";
2091 // We are only interested in the type plane of the symbol table.
2092 TypeSymbolTable::const_iterator I = TST.begin();
2093 TypeSymbolTable::const_iterator End = TST.end();
2095 // If there are no type names, exit early.
2096 if (I == End) return;
2098 // Print out forward declarations for structure types before anything else!
2099 Out << "/* Structure forward decls */\n";
2100 for (; I != End; ++I) {
2101 std::string Name = "struct " + CBEMangle("l_"+I->first);
2102 Out << Name << ";\n";
2103 TypeNames.insert(std::make_pair(I->second, Name));
2108 // Now we can print out typedefs. Above, we guaranteed that this can only be
2109 // for struct or opaque types.
2110 Out << "/* Typedefs */\n";
2111 for (I = TST.begin(); I != End; ++I) {
2112 std::string Name = CBEMangle("l_"+I->first);
2114 printType(Out, I->second, false, Name);
2120 // Keep track of which structures have been printed so far...
2121 std::set<const Type *> StructPrinted;
2123 // Loop over all structures then push them into the stack so they are
2124 // printed in the correct order.
2126 Out << "/* Structure contents */\n";
2127 for (I = TST.begin(); I != End; ++I)
2128 if (I->second->isStructTy() || I->second->isArrayTy())
2129 // Only print out used types!
2130 printContainedStructs(I->second, StructPrinted);
2133 // Push the struct onto the stack and recursively push all structs
2134 // this one depends on.
2136 // TODO: Make this work properly with vector types
2138 void CWriter::printContainedStructs(const Type *Ty,
2139 std::set<const Type*> &StructPrinted) {
2140 // Don't walk through pointers.
2141 if (Ty->isPointerTy() || Ty->isPrimitiveType() || Ty->isIntegerTy())
2144 // Print all contained types first.
2145 for (Type::subtype_iterator I = Ty->subtype_begin(),
2146 E = Ty->subtype_end(); I != E; ++I)
2147 printContainedStructs(*I, StructPrinted);
2149 if (Ty->isStructTy() || Ty->isArrayTy()) {
2150 // Check to see if we have already printed this struct.
2151 if (StructPrinted.insert(Ty).second) {
2152 // Print structure type out.
2153 std::string Name = TypeNames[Ty];
2154 printType(Out, Ty, false, Name, true);
2160 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
2161 /// isStructReturn - Should this function actually return a struct by-value?
2162 bool isStructReturn = F->hasStructRetAttr();
2164 if (F->hasLocalLinkage()) Out << "static ";
2165 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
2166 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
2167 switch (F->getCallingConv()) {
2168 case CallingConv::X86_StdCall:
2169 Out << "__attribute__((stdcall)) ";
2171 case CallingConv::X86_FastCall:
2172 Out << "__attribute__((fastcall)) ";
2174 case CallingConv::X86_ThisCall:
2175 Out << "__attribute__((thiscall)) ";
2181 // Loop over the arguments, printing them...
2182 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
2183 const AttrListPtr &PAL = F->getAttributes();
2186 raw_string_ostream FunctionInnards(tstr);
2188 // Print out the name...
2189 FunctionInnards << GetValueName(F) << '(';
2191 bool PrintedArg = false;
2192 if (!F->isDeclaration()) {
2193 if (!F->arg_empty()) {
2194 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
2197 // If this is a struct-return function, don't print the hidden
2198 // struct-return argument.
2199 if (isStructReturn) {
2200 assert(I != E && "Invalid struct return function!");
2205 std::string ArgName;
2206 for (; I != E; ++I) {
2207 if (PrintedArg) FunctionInnards << ", ";
2208 if (I->hasName() || !Prototype)
2209 ArgName = GetValueName(I);
2212 const Type *ArgTy = I->getType();
2213 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2214 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2215 ByValParams.insert(I);
2217 printType(FunctionInnards, ArgTy,
2218 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt),
2225 // Loop over the arguments, printing them.
2226 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
2229 // If this is a struct-return function, don't print the hidden
2230 // struct-return argument.
2231 if (isStructReturn) {
2232 assert(I != E && "Invalid struct return function!");
2237 for (; I != E; ++I) {
2238 if (PrintedArg) FunctionInnards << ", ";
2239 const Type *ArgTy = *I;
2240 if (PAL.paramHasAttr(Idx, Attribute::ByVal)) {
2241 assert(ArgTy->isPointerTy());
2242 ArgTy = cast<PointerType>(ArgTy)->getElementType();
2244 printType(FunctionInnards, ArgTy,
2245 /*isSigned=*/PAL.paramHasAttr(Idx, Attribute::SExt));
2251 if (!PrintedArg && FT->isVarArg()) {
2252 FunctionInnards << "int vararg_dummy_arg";
2256 // Finish printing arguments... if this is a vararg function, print the ...,
2257 // unless there are no known types, in which case, we just emit ().
2259 if (FT->isVarArg() && PrintedArg) {
2260 FunctionInnards << ",..."; // Output varargs portion of signature!
2261 } else if (!FT->isVarArg() && !PrintedArg) {
2262 FunctionInnards << "void"; // ret() -> ret(void) in C.
2264 FunctionInnards << ')';
2266 // Get the return tpe for the function.
2268 if (!isStructReturn)
2269 RetTy = F->getReturnType();
2271 // If this is a struct-return function, print the struct-return type.
2272 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
2275 // Print out the return type and the signature built above.
2276 printType(Out, RetTy,
2277 /*isSigned=*/PAL.paramHasAttr(0, Attribute::SExt),
2278 FunctionInnards.str());
2281 static inline bool isFPIntBitCast(const Instruction &I) {
2282 if (!isa<BitCastInst>(I))
2284 const Type *SrcTy = I.getOperand(0)->getType();
2285 const Type *DstTy = I.getType();
2286 return (SrcTy->isFloatingPointTy() && DstTy->isIntegerTy()) ||
2287 (DstTy->isFloatingPointTy() && SrcTy->isIntegerTy());
2290 void CWriter::printFunction(Function &F) {
2291 /// isStructReturn - Should this function actually return a struct by-value?
2292 bool isStructReturn = F.hasStructRetAttr();
2294 printFunctionSignature(&F, false);
2297 // If this is a struct return function, handle the result with magic.
2298 if (isStructReturn) {
2299 const Type *StructTy =
2300 cast<PointerType>(F.arg_begin()->getType())->getElementType();
2302 printType(Out, StructTy, false, "StructReturn");
2303 Out << "; /* Struct return temporary */\n";
2306 printType(Out, F.arg_begin()->getType(), false,
2307 GetValueName(F.arg_begin()));
2308 Out << " = &StructReturn;\n";
2311 bool PrintedVar = false;
2313 // print local variable information for the function
2314 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
2315 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
2317 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
2318 Out << "; /* Address-exposed local */\n";
2320 } else if (I->getType() != Type::getVoidTy(F.getContext()) &&
2321 !isInlinableInst(*I)) {
2323 printType(Out, I->getType(), false, GetValueName(&*I));
2326 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
2328 printType(Out, I->getType(), false,
2329 GetValueName(&*I)+"__PHI_TEMPORARY");
2334 // We need a temporary for the BitCast to use so it can pluck a value out
2335 // of a union to do the BitCast. This is separate from the need for a
2336 // variable to hold the result of the BitCast.
2337 if (isFPIntBitCast(*I)) {
2338 Out << " llvmBitCastUnion " << GetValueName(&*I)
2339 << "__BITCAST_TEMPORARY;\n";
2347 if (F.hasExternalLinkage() && F.getName() == "main")
2348 Out << " CODE_FOR_MAIN();\n";
2350 // print the basic blocks
2351 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
2352 if (Loop *L = LI->getLoopFor(BB)) {
2353 if (L->getHeader() == BB && L->getParentLoop() == 0)
2356 printBasicBlock(BB);
2363 void CWriter::printLoop(Loop *L) {
2364 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
2365 << "' to make GCC happy */\n";
2366 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
2367 BasicBlock *BB = L->getBlocks()[i];
2368 Loop *BBLoop = LI->getLoopFor(BB);
2370 printBasicBlock(BB);
2371 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
2374 Out << " } while (1); /* end of syntactic loop '"
2375 << L->getHeader()->getName() << "' */\n";
2378 void CWriter::printBasicBlock(BasicBlock *BB) {
2380 // Don't print the label for the basic block if there are no uses, or if
2381 // the only terminator use is the predecessor basic block's terminator.
2382 // We have to scan the use list because PHI nodes use basic blocks too but
2383 // do not require a label to be generated.
2385 bool NeedsLabel = false;
2386 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
2387 if (isGotoCodeNecessary(*PI, BB)) {
2392 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2394 // Output all of the instructions in the basic block...
2395 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2397 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2398 if (II->getType() != Type::getVoidTy(BB->getContext()) &&
2403 writeInstComputationInline(*II);
2408 // Don't emit prefix or suffix for the terminator.
2409 visit(*BB->getTerminator());
2413 // Specific Instruction type classes... note that all of the casts are
2414 // necessary because we use the instruction classes as opaque types...
2416 void CWriter::visitReturnInst(ReturnInst &I) {
2417 // If this is a struct return function, return the temporary struct.
2418 bool isStructReturn = I.getParent()->getParent()->hasStructRetAttr();
2420 if (isStructReturn) {
2421 Out << " return StructReturn;\n";
2425 // Don't output a void return if this is the last basic block in the function
2426 if (I.getNumOperands() == 0 &&
2427 &*--I.getParent()->getParent()->end() == I.getParent() &&
2428 !I.getParent()->size() == 1) {
2432 if (I.getNumOperands() > 1) {
2435 printType(Out, I.getParent()->getParent()->getReturnType());
2436 Out << " llvm_cbe_mrv_temp = {\n";
2437 for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
2439 writeOperand(I.getOperand(i));
2445 Out << " return llvm_cbe_mrv_temp;\n";
2451 if (I.getNumOperands()) {
2453 writeOperand(I.getOperand(0));
2458 void CWriter::visitSwitchInst(SwitchInst &SI) {
2461 writeOperand(SI.getOperand(0));
2462 Out << ") {\n default:\n";
2463 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2464 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2466 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2468 writeOperand(SI.getOperand(i));
2470 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2471 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2472 printBranchToBlock(SI.getParent(), Succ, 2);
2473 if (Function::iterator(Succ) == llvm::next(Function::iterator(SI.getParent())))
2479 void CWriter::visitIndirectBrInst(IndirectBrInst &IBI) {
2480 Out << " goto *(void*)(";
2481 writeOperand(IBI.getOperand(0));
2485 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2486 Out << " /*UNREACHABLE*/;\n";
2489 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2490 /// FIXME: This should be reenabled, but loop reordering safe!!
2493 if (llvm::next(Function::iterator(From)) != Function::iterator(To))
2494 return true; // Not the direct successor, we need a goto.
2496 //isa<SwitchInst>(From->getTerminator())
2498 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2503 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2504 BasicBlock *Successor,
2506 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2507 PHINode *PN = cast<PHINode>(I);
2508 // Now we have to do the printing.
2509 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2510 if (!isa<UndefValue>(IV)) {
2511 Out << std::string(Indent, ' ');
2512 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2514 Out << "; /* for PHI node */\n";
2519 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2521 if (isGotoCodeNecessary(CurBB, Succ)) {
2522 Out << std::string(Indent, ' ') << " goto ";
2528 // Branch instruction printing - Avoid printing out a branch to a basic block
2529 // that immediately succeeds the current one.
2531 void CWriter::visitBranchInst(BranchInst &I) {
2533 if (I.isConditional()) {
2534 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2536 writeOperand(I.getCondition());
2539 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2540 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2542 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2543 Out << " } else {\n";
2544 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2545 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2548 // First goto not necessary, assume second one is...
2550 writeOperand(I.getCondition());
2553 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2554 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2559 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2560 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2565 // PHI nodes get copied into temporary values at the end of predecessor basic
2566 // blocks. We now need to copy these temporary values into the REAL value for
2568 void CWriter::visitPHINode(PHINode &I) {
2570 Out << "__PHI_TEMPORARY";
2574 void CWriter::visitBinaryOperator(Instruction &I) {
2575 // binary instructions, shift instructions, setCond instructions.
2576 assert(!I.getType()->isPointerTy());
2578 // We must cast the results of binary operations which might be promoted.
2579 bool needsCast = false;
2580 if ((I.getType() == Type::getInt8Ty(I.getContext())) ||
2581 (I.getType() == Type::getInt16Ty(I.getContext()))
2582 || (I.getType() == Type::getFloatTy(I.getContext()))) {
2585 printType(Out, I.getType(), false);
2589 // If this is a negation operation, print it out as such. For FP, we don't
2590 // want to print "-0.0 - X".
2591 if (BinaryOperator::isNeg(&I)) {
2593 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2595 } else if (BinaryOperator::isFNeg(&I)) {
2597 writeOperand(BinaryOperator::getFNegArgument(cast<BinaryOperator>(&I)));
2599 } else if (I.getOpcode() == Instruction::FRem) {
2600 // Output a call to fmod/fmodf instead of emitting a%b
2601 if (I.getType() == Type::getFloatTy(I.getContext()))
2603 else if (I.getType() == Type::getDoubleTy(I.getContext()))
2605 else // all 3 flavors of long double
2607 writeOperand(I.getOperand(0));
2609 writeOperand(I.getOperand(1));
2613 // Write out the cast of the instruction's value back to the proper type
2615 bool NeedsClosingParens = writeInstructionCast(I);
2617 // Certain instructions require the operand to be forced to a specific type
2618 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2619 // below for operand 1
2620 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2622 switch (I.getOpcode()) {
2623 case Instruction::Add:
2624 case Instruction::FAdd: Out << " + "; break;
2625 case Instruction::Sub:
2626 case Instruction::FSub: Out << " - "; break;
2627 case Instruction::Mul:
2628 case Instruction::FMul: Out << " * "; break;
2629 case Instruction::URem:
2630 case Instruction::SRem:
2631 case Instruction::FRem: Out << " % "; break;
2632 case Instruction::UDiv:
2633 case Instruction::SDiv:
2634 case Instruction::FDiv: Out << " / "; break;
2635 case Instruction::And: Out << " & "; break;
2636 case Instruction::Or: Out << " | "; break;
2637 case Instruction::Xor: Out << " ^ "; break;
2638 case Instruction::Shl : Out << " << "; break;
2639 case Instruction::LShr:
2640 case Instruction::AShr: Out << " >> "; break;
2643 errs() << "Invalid operator type!" << I;
2645 llvm_unreachable(0);
2648 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2649 if (NeedsClosingParens)
2658 void CWriter::visitICmpInst(ICmpInst &I) {
2659 // We must cast the results of icmp which might be promoted.
2660 bool needsCast = false;
2662 // Write out the cast of the instruction's value back to the proper type
2664 bool NeedsClosingParens = writeInstructionCast(I);
2666 // Certain icmp predicate require the operand to be forced to a specific type
2667 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2668 // below for operand 1
2669 writeOperandWithCast(I.getOperand(0), I);
2671 switch (I.getPredicate()) {
2672 case ICmpInst::ICMP_EQ: Out << " == "; break;
2673 case ICmpInst::ICMP_NE: Out << " != "; break;
2674 case ICmpInst::ICMP_ULE:
2675 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2676 case ICmpInst::ICMP_UGE:
2677 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2678 case ICmpInst::ICMP_ULT:
2679 case ICmpInst::ICMP_SLT: Out << " < "; break;
2680 case ICmpInst::ICMP_UGT:
2681 case ICmpInst::ICMP_SGT: Out << " > "; break;
2684 errs() << "Invalid icmp predicate!" << I;
2686 llvm_unreachable(0);
2689 writeOperandWithCast(I.getOperand(1), I);
2690 if (NeedsClosingParens)
2698 void CWriter::visitFCmpInst(FCmpInst &I) {
2699 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2703 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2709 switch (I.getPredicate()) {
2710 default: llvm_unreachable("Illegal FCmp predicate");
2711 case FCmpInst::FCMP_ORD: op = "ord"; break;
2712 case FCmpInst::FCMP_UNO: op = "uno"; break;
2713 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2714 case FCmpInst::FCMP_UNE: op = "une"; break;
2715 case FCmpInst::FCMP_ULT: op = "ult"; break;
2716 case FCmpInst::FCMP_ULE: op = "ule"; break;
2717 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2718 case FCmpInst::FCMP_UGE: op = "uge"; break;
2719 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2720 case FCmpInst::FCMP_ONE: op = "one"; break;
2721 case FCmpInst::FCMP_OLT: op = "olt"; break;
2722 case FCmpInst::FCMP_OLE: op = "ole"; break;
2723 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2724 case FCmpInst::FCMP_OGE: op = "oge"; break;
2727 Out << "llvm_fcmp_" << op << "(";
2728 // Write the first operand
2729 writeOperand(I.getOperand(0));
2731 // Write the second operand
2732 writeOperand(I.getOperand(1));
2736 static const char * getFloatBitCastField(const Type *Ty) {
2737 switch (Ty->getTypeID()) {
2738 default: llvm_unreachable("Invalid Type");
2739 case Type::FloatTyID: return "Float";
2740 case Type::DoubleTyID: return "Double";
2741 case Type::IntegerTyID: {
2742 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2751 void CWriter::visitCastInst(CastInst &I) {
2752 const Type *DstTy = I.getType();
2753 const Type *SrcTy = I.getOperand(0)->getType();
2754 if (isFPIntBitCast(I)) {
2756 // These int<->float and long<->double casts need to be handled specially
2757 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2758 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2759 writeOperand(I.getOperand(0));
2760 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2761 << getFloatBitCastField(I.getType());
2767 printCast(I.getOpcode(), SrcTy, DstTy);
2769 // Make a sext from i1 work by subtracting the i1 from 0 (an int).
2770 if (SrcTy == Type::getInt1Ty(I.getContext()) &&
2771 I.getOpcode() == Instruction::SExt)
2774 writeOperand(I.getOperand(0));
2776 if (DstTy == Type::getInt1Ty(I.getContext()) &&
2777 (I.getOpcode() == Instruction::Trunc ||
2778 I.getOpcode() == Instruction::FPToUI ||
2779 I.getOpcode() == Instruction::FPToSI ||
2780 I.getOpcode() == Instruction::PtrToInt)) {
2781 // Make sure we really get a trunc to bool by anding the operand with 1
2787 void CWriter::visitSelectInst(SelectInst &I) {
2789 writeOperand(I.getCondition());
2791 writeOperand(I.getTrueValue());
2793 writeOperand(I.getFalseValue());
2798 void CWriter::lowerIntrinsics(Function &F) {
2799 // This is used to keep track of intrinsics that get generated to a lowered
2800 // function. We must generate the prototypes before the function body which
2801 // will only be expanded on first use (by the loop below).
2802 std::vector<Function*> prototypesToGen;
2804 // Examine all the instructions in this function to find the intrinsics that
2805 // need to be lowered.
2806 for (Function::iterator BB = F.begin(), EE = F.end(); BB != EE; ++BB)
2807 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2808 if (CallInst *CI = dyn_cast<CallInst>(I++))
2809 if (Function *F = CI->getCalledFunction())
2810 switch (F->getIntrinsicID()) {
2811 case Intrinsic::not_intrinsic:
2812 case Intrinsic::memory_barrier:
2813 case Intrinsic::vastart:
2814 case Intrinsic::vacopy:
2815 case Intrinsic::vaend:
2816 case Intrinsic::returnaddress:
2817 case Intrinsic::frameaddress:
2818 case Intrinsic::setjmp:
2819 case Intrinsic::longjmp:
2820 case Intrinsic::prefetch:
2821 case Intrinsic::powi:
2822 case Intrinsic::x86_sse_cmp_ss:
2823 case Intrinsic::x86_sse_cmp_ps:
2824 case Intrinsic::x86_sse2_cmp_sd:
2825 case Intrinsic::x86_sse2_cmp_pd:
2826 case Intrinsic::ppc_altivec_lvsl:
2827 // We directly implement these intrinsics
2830 // If this is an intrinsic that directly corresponds to a GCC
2831 // builtin, we handle it.
2832 const char *BuiltinName = "";
2833 #define GET_GCC_BUILTIN_NAME
2834 #include "llvm/Intrinsics.gen"
2835 #undef GET_GCC_BUILTIN_NAME
2836 // If we handle it, don't lower it.
2837 if (BuiltinName[0]) break;
2839 // All other intrinsic calls we must lower.
2840 Instruction *Before = 0;
2841 if (CI != &BB->front())
2842 Before = prior(BasicBlock::iterator(CI));
2844 IL->LowerIntrinsicCall(CI);
2845 if (Before) { // Move iterator to instruction after call
2850 // If the intrinsic got lowered to another call, and that call has
2851 // a definition then we need to make sure its prototype is emitted
2852 // before any calls to it.
2853 if (CallInst *Call = dyn_cast<CallInst>(I))
2854 if (Function *NewF = Call->getCalledFunction())
2855 if (!NewF->isDeclaration())
2856 prototypesToGen.push_back(NewF);
2861 // We may have collected some prototypes to emit in the loop above.
2862 // Emit them now, before the function that uses them is emitted. But,
2863 // be careful not to emit them twice.
2864 std::vector<Function*>::iterator I = prototypesToGen.begin();
2865 std::vector<Function*>::iterator E = prototypesToGen.end();
2866 for ( ; I != E; ++I) {
2867 if (intrinsicPrototypesAlreadyGenerated.insert(*I).second) {
2869 printFunctionSignature(*I, true);
2875 void CWriter::visitCallInst(CallInst &I) {
2876 if (isa<InlineAsm>(I.getCalledValue()))
2877 return visitInlineAsm(I);
2879 bool WroteCallee = false;
2881 // Handle intrinsic function calls first...
2882 if (Function *F = I.getCalledFunction())
2883 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID())
2884 if (visitBuiltinCall(I, ID, WroteCallee))
2887 Value *Callee = I.getCalledValue();
2889 const PointerType *PTy = cast<PointerType>(Callee->getType());
2890 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2892 // If this is a call to a struct-return function, assign to the first
2893 // parameter instead of passing it to the call.
2894 const AttrListPtr &PAL = I.getAttributes();
2895 bool hasByVal = I.hasByValArgument();
2896 bool isStructRet = I.hasStructRetAttr();
2898 writeOperandDeref(I.getArgOperand(0));
2902 if (I.isTailCall()) Out << " /*tail*/ ";
2905 // If this is an indirect call to a struct return function, we need to cast
2906 // the pointer. Ditto for indirect calls with byval arguments.
2907 bool NeedsCast = (hasByVal || isStructRet) && !isa<Function>(Callee);
2909 // GCC is a real PITA. It does not permit codegening casts of functions to
2910 // function pointers if they are in a call (it generates a trap instruction
2911 // instead!). We work around this by inserting a cast to void* in between
2912 // the function and the function pointer cast. Unfortunately, we can't just
2913 // form the constant expression here, because the folder will immediately
2916 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2917 // that void* and function pointers have the same size. :( To deal with this
2918 // in the common case, we handle casts where the number of arguments passed
2921 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2923 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2929 // Ok, just cast the pointer type.
2932 printStructReturnPointerFunctionType(Out, PAL,
2933 cast<PointerType>(I.getCalledValue()->getType()));
2935 printType(Out, I.getCalledValue()->getType(), false, "", true, PAL);
2937 printType(Out, I.getCalledValue()->getType());
2940 writeOperand(Callee);
2941 if (NeedsCast) Out << ')';
2946 bool PrintedArg = false;
2947 if(FTy->isVarArg() && !FTy->getNumParams()) {
2948 Out << "0 /*dummy arg*/";
2952 unsigned NumDeclaredParams = FTy->getNumParams();
2954 CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
2956 if (isStructRet) { // Skip struct return argument.
2962 for (; AI != AE; ++AI, ++ArgNo) {
2963 if (PrintedArg) Out << ", ";
2964 if (ArgNo < NumDeclaredParams &&
2965 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2967 printType(Out, FTy->getParamType(ArgNo),
2968 /*isSigned=*/PAL.paramHasAttr(ArgNo+1, Attribute::SExt));
2971 // Check if the argument is expected to be passed by value.
2972 if (I.paramHasAttr(ArgNo+1, Attribute::ByVal))
2973 writeOperandDeref(*AI);
2981 /// visitBuiltinCall - Handle the call to the specified builtin. Returns true
2982 /// if the entire call is handled, return false if it wasn't handled, and
2983 /// optionally set 'WroteCallee' if the callee has already been printed out.
2984 bool CWriter::visitBuiltinCall(CallInst &I, Intrinsic::ID ID,
2985 bool &WroteCallee) {
2988 // If this is an intrinsic that directly corresponds to a GCC
2989 // builtin, we emit it here.
2990 const char *BuiltinName = "";
2991 Function *F = I.getCalledFunction();
2992 #define GET_GCC_BUILTIN_NAME
2993 #include "llvm/Intrinsics.gen"
2994 #undef GET_GCC_BUILTIN_NAME
2995 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
3001 case Intrinsic::memory_barrier:
3002 Out << "__sync_synchronize()";
3004 case Intrinsic::vastart:
3007 Out << "va_start(*(va_list*)";
3008 writeOperand(I.getArgOperand(0));
3010 // Output the last argument to the enclosing function.
3011 if (I.getParent()->getParent()->arg_empty())
3012 Out << "vararg_dummy_arg";
3014 writeOperand(--I.getParent()->getParent()->arg_end());
3017 case Intrinsic::vaend:
3018 if (!isa<ConstantPointerNull>(I.getArgOperand(0))) {
3019 Out << "0; va_end(*(va_list*)";
3020 writeOperand(I.getArgOperand(0));
3023 Out << "va_end(*(va_list*)0)";
3026 case Intrinsic::vacopy:
3028 Out << "va_copy(*(va_list*)";
3029 writeOperand(I.getArgOperand(0));
3030 Out << ", *(va_list*)";
3031 writeOperand(I.getArgOperand(1));
3034 case Intrinsic::returnaddress:
3035 Out << "__builtin_return_address(";
3036 writeOperand(I.getArgOperand(0));
3039 case Intrinsic::frameaddress:
3040 Out << "__builtin_frame_address(";
3041 writeOperand(I.getArgOperand(0));
3044 case Intrinsic::powi:
3045 Out << "__builtin_powi(";
3046 writeOperand(I.getArgOperand(0));
3048 writeOperand(I.getArgOperand(1));
3051 case Intrinsic::setjmp:
3052 Out << "setjmp(*(jmp_buf*)";
3053 writeOperand(I.getArgOperand(0));
3056 case Intrinsic::longjmp:
3057 Out << "longjmp(*(jmp_buf*)";
3058 writeOperand(I.getArgOperand(0));
3060 writeOperand(I.getArgOperand(1));
3063 case Intrinsic::prefetch:
3064 Out << "LLVM_PREFETCH((const void *)";
3065 writeOperand(I.getArgOperand(0));
3067 writeOperand(I.getArgOperand(1));
3069 writeOperand(I.getArgOperand(2));
3072 case Intrinsic::stacksave:
3073 // Emit this as: Val = 0; *((void**)&Val) = __builtin_stack_save()
3074 // to work around GCC bugs (see PR1809).
3075 Out << "0; *((void**)&" << GetValueName(&I)
3076 << ") = __builtin_stack_save()";
3078 case Intrinsic::x86_sse_cmp_ss:
3079 case Intrinsic::x86_sse_cmp_ps:
3080 case Intrinsic::x86_sse2_cmp_sd:
3081 case Intrinsic::x86_sse2_cmp_pd:
3083 printType(Out, I.getType());
3085 // Multiple GCC builtins multiplex onto this intrinsic.
3086 switch (cast<ConstantInt>(I.getArgOperand(2))->getZExtValue()) {
3087 default: llvm_unreachable("Invalid llvm.x86.sse.cmp!");
3088 case 0: Out << "__builtin_ia32_cmpeq"; break;
3089 case 1: Out << "__builtin_ia32_cmplt"; break;
3090 case 2: Out << "__builtin_ia32_cmple"; break;
3091 case 3: Out << "__builtin_ia32_cmpunord"; break;
3092 case 4: Out << "__builtin_ia32_cmpneq"; break;
3093 case 5: Out << "__builtin_ia32_cmpnlt"; break;
3094 case 6: Out << "__builtin_ia32_cmpnle"; break;
3095 case 7: Out << "__builtin_ia32_cmpord"; break;
3097 if (ID == Intrinsic::x86_sse_cmp_ps || ID == Intrinsic::x86_sse2_cmp_pd)
3101 if (ID == Intrinsic::x86_sse_cmp_ss || ID == Intrinsic::x86_sse_cmp_ps)
3107 writeOperand(I.getArgOperand(0));
3109 writeOperand(I.getArgOperand(1));
3112 case Intrinsic::ppc_altivec_lvsl:
3114 printType(Out, I.getType());
3116 Out << "__builtin_altivec_lvsl(0, (void*)";
3117 writeOperand(I.getArgOperand(0));
3123 //This converts the llvm constraint string to something gcc is expecting.
3124 //TODO: work out platform independent constraints and factor those out
3125 // of the per target tables
3126 // handle multiple constraint codes
3127 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
3128 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
3130 // Grab the translation table from MCAsmInfo if it exists.
3131 const MCAsmInfo *TargetAsm;
3132 std::string Triple = TheModule->getTargetTriple();
3134 Triple = llvm::sys::getHostTriple();
3137 if (const Target *Match = TargetRegistry::lookupTarget(Triple, E))
3138 TargetAsm = Match->createAsmInfo(Triple);
3142 const char *const *table = TargetAsm->getAsmCBE();
3144 // Search the translation table if it exists.
3145 for (int i = 0; table && table[i]; i += 2)
3146 if (c.Codes[0] == table[i]) {
3151 // Default is identity.
3156 //TODO: import logic from AsmPrinter.cpp
3157 static std::string gccifyAsm(std::string asmstr) {
3158 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
3159 if (asmstr[i] == '\n')
3160 asmstr.replace(i, 1, "\\n");
3161 else if (asmstr[i] == '\t')
3162 asmstr.replace(i, 1, "\\t");
3163 else if (asmstr[i] == '$') {
3164 if (asmstr[i + 1] == '{') {
3165 std::string::size_type a = asmstr.find_first_of(':', i + 1);
3166 std::string::size_type b = asmstr.find_first_of('}', i + 1);
3167 std::string n = "%" +
3168 asmstr.substr(a + 1, b - a - 1) +
3169 asmstr.substr(i + 2, a - i - 2);
3170 asmstr.replace(i, b - i + 1, n);
3173 asmstr.replace(i, 1, "%");
3175 else if (asmstr[i] == '%')//grr
3176 { asmstr.replace(i, 1, "%%"); ++i;}
3181 //TODO: assumptions about what consume arguments from the call are likely wrong
3182 // handle communitivity
3183 void CWriter::visitInlineAsm(CallInst &CI) {
3184 InlineAsm* as = cast<InlineAsm>(CI.getCalledValue());
3185 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
3187 std::vector<std::pair<Value*, int> > ResultVals;
3188 if (CI.getType() == Type::getVoidTy(CI.getContext()))
3190 else if (const StructType *ST = dyn_cast<StructType>(CI.getType())) {
3191 for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i)
3192 ResultVals.push_back(std::make_pair(&CI, (int)i));
3194 ResultVals.push_back(std::make_pair(&CI, -1));
3197 // Fix up the asm string for gcc and emit it.
3198 Out << "__asm__ volatile (\"" << gccifyAsm(as->getAsmString()) << "\"\n";
3201 unsigned ValueCount = 0;
3202 bool IsFirst = true;
3204 // Convert over all the output constraints.
3205 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3206 E = Constraints.end(); I != E; ++I) {
3208 if (I->Type != InlineAsm::isOutput) {
3210 continue; // Ignore non-output constraints.
3213 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3214 std::string C = InterpretASMConstraint(*I);
3215 if (C.empty()) continue;
3226 if (ValueCount < ResultVals.size()) {
3227 DestVal = ResultVals[ValueCount].first;
3228 DestValNo = ResultVals[ValueCount].second;
3230 DestVal = CI.getArgOperand(ValueCount-ResultVals.size());
3232 if (I->isEarlyClobber)
3235 Out << "\"=" << C << "\"(" << GetValueName(DestVal);
3236 if (DestValNo != -1)
3237 Out << ".field" << DestValNo; // Multiple retvals.
3243 // Convert over all the input constraints.
3247 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3248 E = Constraints.end(); I != E; ++I) {
3249 if (I->Type != InlineAsm::isInput) {
3251 continue; // Ignore non-input constraints.
3254 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3255 std::string C = InterpretASMConstraint(*I);
3256 if (C.empty()) continue;
3263 assert(ValueCount >= ResultVals.size() && "Input can't refer to result");
3264 Value *SrcVal = CI.getArgOperand(ValueCount-ResultVals.size());
3266 Out << "\"" << C << "\"(";
3268 writeOperand(SrcVal);
3270 writeOperandDeref(SrcVal);
3274 // Convert over the clobber constraints.
3276 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
3277 E = Constraints.end(); I != E; ++I) {
3278 if (I->Type != InlineAsm::isClobber)
3279 continue; // Ignore non-input constraints.
3281 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
3282 std::string C = InterpretASMConstraint(*I);
3283 if (C.empty()) continue;
3290 Out << '\"' << C << '"';
3296 void CWriter::visitAllocaInst(AllocaInst &I) {
3298 printType(Out, I.getType());
3299 Out << ") alloca(sizeof(";
3300 printType(Out, I.getType()->getElementType());
3302 if (I.isArrayAllocation()) {
3304 writeOperand(I.getOperand(0));
3309 void CWriter::printGEPExpression(Value *Ptr, gep_type_iterator I,
3310 gep_type_iterator E, bool Static) {
3312 // If there are no indices, just print out the pointer.
3318 // Find out if the last index is into a vector. If so, we have to print this
3319 // specially. Since vectors can't have elements of indexable type, only the
3320 // last index could possibly be of a vector element.
3321 const VectorType *LastIndexIsVector = 0;
3323 for (gep_type_iterator TmpI = I; TmpI != E; ++TmpI)
3324 LastIndexIsVector = dyn_cast<VectorType>(*TmpI);
3329 // If the last index is into a vector, we can't print it as &a[i][j] because
3330 // we can't index into a vector with j in GCC. Instead, emit this as
3331 // (((float*)&a[i])+j)
3332 if (LastIndexIsVector) {
3334 printType(Out, PointerType::getUnqual(LastIndexIsVector->getElementType()));
3340 // If the first index is 0 (very typical) we can do a number of
3341 // simplifications to clean up the code.
3342 Value *FirstOp = I.getOperand();
3343 if (!isa<Constant>(FirstOp) || !cast<Constant>(FirstOp)->isNullValue()) {
3344 // First index isn't simple, print it the hard way.
3347 ++I; // Skip the zero index.
3349 // Okay, emit the first operand. If Ptr is something that is already address
3350 // exposed, like a global, avoid emitting (&foo)[0], just emit foo instead.
3351 if (isAddressExposed(Ptr)) {
3352 writeOperandInternal(Ptr, Static);
3353 } else if (I != E && (*I)->isStructTy()) {
3354 // If we didn't already emit the first operand, see if we can print it as
3355 // P->f instead of "P[0].f"
3357 Out << "->field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3358 ++I; // eat the struct index as well.
3360 // Instead of emitting P[0][1], emit (*P)[1], which is more idiomatic.
3367 for (; I != E; ++I) {
3368 if ((*I)->isStructTy()) {
3369 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
3370 } else if ((*I)->isArrayTy()) {
3372 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3374 } else if (!(*I)->isVectorTy()) {
3376 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3379 // If the last index is into a vector, then print it out as "+j)". This
3380 // works with the 'LastIndexIsVector' code above.
3381 if (isa<Constant>(I.getOperand()) &&
3382 cast<Constant>(I.getOperand())->isNullValue()) {
3383 Out << "))"; // avoid "+0".
3386 writeOperandWithCast(I.getOperand(), Instruction::GetElementPtr);
3394 void CWriter::writeMemoryAccess(Value *Operand, const Type *OperandType,
3395 bool IsVolatile, unsigned Alignment) {
3397 bool IsUnaligned = Alignment &&
3398 Alignment < TD->getABITypeAlignment(OperandType);
3402 if (IsVolatile || IsUnaligned) {
3405 Out << "struct __attribute__ ((packed, aligned(" << Alignment << "))) {";
3406 printType(Out, OperandType, false, IsUnaligned ? "data" : "volatile*");
3409 if (IsVolatile) Out << "volatile ";
3415 writeOperand(Operand);
3417 if (IsVolatile || IsUnaligned) {
3424 void CWriter::visitLoadInst(LoadInst &I) {
3425 writeMemoryAccess(I.getOperand(0), I.getType(), I.isVolatile(),
3430 void CWriter::visitStoreInst(StoreInst &I) {
3431 writeMemoryAccess(I.getPointerOperand(), I.getOperand(0)->getType(),
3432 I.isVolatile(), I.getAlignment());
3434 Value *Operand = I.getOperand(0);
3435 Constant *BitMask = 0;
3436 if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
3437 if (!ITy->isPowerOf2ByteWidth())
3438 // We have a bit width that doesn't match an even power-of-2 byte
3439 // size. Consequently we must & the value with the type's bit mask
3440 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
3443 writeOperand(Operand);
3446 printConstant(BitMask, false);
3451 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
3452 printGEPExpression(I.getPointerOperand(), gep_type_begin(I),
3453 gep_type_end(I), false);
3456 void CWriter::visitVAArgInst(VAArgInst &I) {
3457 Out << "va_arg(*(va_list*)";
3458 writeOperand(I.getOperand(0));
3460 printType(Out, I.getType());
3464 void CWriter::visitInsertElementInst(InsertElementInst &I) {
3465 const Type *EltTy = I.getType()->getElementType();
3466 writeOperand(I.getOperand(0));
3469 printType(Out, PointerType::getUnqual(EltTy));
3470 Out << ")(&" << GetValueName(&I) << "))[";
3471 writeOperand(I.getOperand(2));
3473 writeOperand(I.getOperand(1));
3477 void CWriter::visitExtractElementInst(ExtractElementInst &I) {
3478 // We know that our operand is not inlined.
3481 cast<VectorType>(I.getOperand(0)->getType())->getElementType();
3482 printType(Out, PointerType::getUnqual(EltTy));
3483 Out << ")(&" << GetValueName(I.getOperand(0)) << "))[";
3484 writeOperand(I.getOperand(1));
3488 void CWriter::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
3490 printType(Out, SVI.getType());
3492 const VectorType *VT = SVI.getType();
3493 unsigned NumElts = VT->getNumElements();
3494 const Type *EltTy = VT->getElementType();
3496 for (unsigned i = 0; i != NumElts; ++i) {
3498 int SrcVal = SVI.getMaskValue(i);
3499 if ((unsigned)SrcVal >= NumElts*2) {
3500 Out << " 0/*undef*/ ";
3502 Value *Op = SVI.getOperand((unsigned)SrcVal >= NumElts);
3503 if (isa<Instruction>(Op)) {
3504 // Do an extractelement of this value from the appropriate input.
3506 printType(Out, PointerType::getUnqual(EltTy));
3507 Out << ")(&" << GetValueName(Op)
3508 << "))[" << (SrcVal & (NumElts-1)) << "]";
3509 } else if (isa<ConstantAggregateZero>(Op) || isa<UndefValue>(Op)) {
3512 printConstant(cast<ConstantVector>(Op)->getOperand(SrcVal &
3521 void CWriter::visitInsertValueInst(InsertValueInst &IVI) {
3522 // Start by copying the entire aggregate value into the result variable.
3523 writeOperand(IVI.getOperand(0));
3526 // Then do the insert to update the field.
3527 Out << GetValueName(&IVI);
3528 for (const unsigned *b = IVI.idx_begin(), *i = b, *e = IVI.idx_end();
3530 const Type *IndexedTy =
3531 ExtractValueInst::getIndexedType(IVI.getOperand(0)->getType(), b, i+1);
3532 if (IndexedTy->isArrayTy())
3533 Out << ".array[" << *i << "]";
3535 Out << ".field" << *i;
3538 writeOperand(IVI.getOperand(1));
3541 void CWriter::visitExtractValueInst(ExtractValueInst &EVI) {
3543 if (isa<UndefValue>(EVI.getOperand(0))) {
3545 printType(Out, EVI.getType());
3546 Out << ") 0/*UNDEF*/";
3548 Out << GetValueName(EVI.getOperand(0));
3549 for (const unsigned *b = EVI.idx_begin(), *i = b, *e = EVI.idx_end();
3551 const Type *IndexedTy =
3552 ExtractValueInst::getIndexedType(EVI.getOperand(0)->getType(), b, i+1);
3553 if (IndexedTy->isArrayTy())
3554 Out << ".array[" << *i << "]";
3556 Out << ".field" << *i;
3562 //===----------------------------------------------------------------------===//
3563 // External Interface declaration
3564 //===----------------------------------------------------------------------===//
3566 bool CTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
3567 formatted_raw_ostream &o,
3568 CodeGenFileType FileType,
3569 CodeGenOpt::Level OptLevel,
3570 bool DisableVerify) {
3571 if (FileType != TargetMachine::CGFT_AssemblyFile) return true;
3573 PM.add(createGCLoweringPass());
3574 PM.add(createLowerInvokePass());
3575 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
3576 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
3577 PM.add(new CWriter(o));
3578 PM.add(createGCInfoDeleter());