1 //===-- CBackend.cpp - Library for converting LLVM code to C --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source 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/ParameterAttributes.h"
22 #include "llvm/Pass.h"
23 #include "llvm/PassManager.h"
24 #include "llvm/TypeSymbolTable.h"
25 #include "llvm/Intrinsics.h"
26 #include "llvm/IntrinsicInst.h"
27 #include "llvm/InlineAsm.h"
28 #include "llvm/Analysis/ConstantsScanner.h"
29 #include "llvm/Analysis/FindUsedTypes.h"
30 #include "llvm/Analysis/LoopInfo.h"
31 #include "llvm/CodeGen/IntrinsicLowering.h"
32 #include "llvm/Transforms/Scalar.h"
33 #include "llvm/Target/TargetMachineRegistry.h"
34 #include "llvm/Target/TargetAsmInfo.h"
35 #include "llvm/Target/TargetData.h"
36 #include "llvm/Support/CallSite.h"
37 #include "llvm/Support/CFG.h"
38 #include "llvm/Support/GetElementPtrTypeIterator.h"
39 #include "llvm/Support/InstVisitor.h"
40 #include "llvm/Support/Mangler.h"
41 #include "llvm/Support/MathExtras.h"
42 #include "llvm/ADT/StringExtras.h"
43 #include "llvm/ADT/STLExtras.h"
44 #include "llvm/Support/MathExtras.h"
45 #include "llvm/Config/config.h"
51 // Register the target.
52 RegisterTarget<CTargetMachine> X("c", " C backend");
54 /// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
55 /// any unnamed structure types that are used by the program, and merges
56 /// external functions with the same name.
58 class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
61 CBackendNameAllUsedStructsAndMergeFunctions()
62 : ModulePass((intptr_t)&ID) {}
63 void getAnalysisUsage(AnalysisUsage &AU) const {
64 AU.addRequired<FindUsedTypes>();
67 virtual const char *getPassName() const {
68 return "C backend type canonicalizer";
71 virtual bool runOnModule(Module &M);
74 const int CBackendNameAllUsedStructsAndMergeFunctions::ID = 0;
76 /// CWriter - This class is the main chunk of code that converts an LLVM
77 /// module to a C translation unit.
78 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
80 IntrinsicLowering *IL;
83 const Module *TheModule;
84 const TargetAsmInfo* TAsm;
86 std::map<const Type *, std::string> TypeNames;
87 std::map<const ConstantFP *, unsigned> FPConstantMap;
88 std::set<Function*> intrinsicPrototypesAlreadyGenerated;
92 CWriter(std::ostream &o)
93 : FunctionPass((intptr_t)&ID), Out(o), IL(0), Mang(0), LI(0),
94 TheModule(0), TAsm(0), TD(0) {}
96 virtual const char *getPassName() const { return "C backend"; }
98 void getAnalysisUsage(AnalysisUsage &AU) const {
99 AU.addRequired<LoopInfo>();
100 AU.setPreservesAll();
103 virtual bool doInitialization(Module &M);
105 bool runOnFunction(Function &F) {
106 LI = &getAnalysis<LoopInfo>();
108 // Get rid of intrinsics we can't handle.
111 // Output all floating point constants that cannot be printed accurately.
112 printFloatingPointConstants(F);
115 FPConstantMap.clear();
119 virtual bool doFinalization(Module &M) {
126 std::ostream &printType(std::ostream &Out, const Type *Ty,
127 bool isSigned = false,
128 const std::string &VariableName = "",
129 bool IgnoreName = false);
130 std::ostream &printSimpleType(std::ostream &Out, const Type *Ty,
132 const std::string &NameSoFar = "");
134 void printStructReturnPointerFunctionType(std::ostream &Out,
135 const PointerType *Ty);
137 void writeOperand(Value *Operand);
138 void writeOperandRaw(Value *Operand);
139 void writeOperandInternal(Value *Operand);
140 void writeOperandWithCast(Value* Operand, unsigned Opcode);
141 void writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate);
142 bool writeInstructionCast(const Instruction &I);
145 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
147 void lowerIntrinsics(Function &F);
149 void printModule(Module *M);
150 void printModuleTypes(const TypeSymbolTable &ST);
151 void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
152 void printFloatingPointConstants(Function &F);
153 void printFunctionSignature(const Function *F, bool Prototype);
155 void printFunction(Function &);
156 void printBasicBlock(BasicBlock *BB);
157 void printLoop(Loop *L);
159 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
160 void printConstant(Constant *CPV);
161 void printConstantWithCast(Constant *CPV, unsigned Opcode);
162 bool printConstExprCast(const ConstantExpr *CE);
163 void printConstantArray(ConstantArray *CPA);
164 void printConstantVector(ConstantVector *CP);
166 // isInlinableInst - Attempt to inline instructions into their uses to build
167 // trees as much as possible. To do this, we have to consistently decide
168 // what is acceptable to inline, so that variable declarations don't get
169 // printed and an extra copy of the expr is not emitted.
171 static bool isInlinableInst(const Instruction &I) {
172 // Always inline cmp instructions, even if they are shared by multiple
173 // expressions. GCC generates horrible code if we don't.
177 // Must be an expression, must be used exactly once. If it is dead, we
178 // emit it inline where it would go.
179 if (I.getType() == Type::VoidTy || !I.hasOneUse() ||
180 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
181 isa<LoadInst>(I) || isa<VAArgInst>(I))
182 // Don't inline a load across a store or other bad things!
185 // Must not be used in inline asm
186 if (I.hasOneUse() && isInlineAsm(*I.use_back())) return false;
188 // Only inline instruction it if it's use is in the same BB as the inst.
189 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
192 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
193 // variables which are accessed with the & operator. This causes GCC to
194 // generate significantly better code than to emit alloca calls directly.
196 static const AllocaInst *isDirectAlloca(const Value *V) {
197 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
198 if (!AI) return false;
199 if (AI->isArrayAllocation())
200 return 0; // FIXME: we can also inline fixed size array allocas!
201 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
206 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
207 static bool isInlineAsm(const Instruction& I) {
208 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
213 // Instruction visitation functions
214 friend class InstVisitor<CWriter>;
216 void visitReturnInst(ReturnInst &I);
217 void visitBranchInst(BranchInst &I);
218 void visitSwitchInst(SwitchInst &I);
219 void visitInvokeInst(InvokeInst &I) {
220 assert(0 && "Lowerinvoke pass didn't work!");
223 void visitUnwindInst(UnwindInst &I) {
224 assert(0 && "Lowerinvoke pass didn't work!");
226 void visitUnreachableInst(UnreachableInst &I);
228 void visitPHINode(PHINode &I);
229 void visitBinaryOperator(Instruction &I);
230 void visitICmpInst(ICmpInst &I);
231 void visitFCmpInst(FCmpInst &I);
233 void visitCastInst (CastInst &I);
234 void visitSelectInst(SelectInst &I);
235 void visitCallInst (CallInst &I);
236 void visitInlineAsm(CallInst &I);
238 void visitMallocInst(MallocInst &I);
239 void visitAllocaInst(AllocaInst &I);
240 void visitFreeInst (FreeInst &I);
241 void visitLoadInst (LoadInst &I);
242 void visitStoreInst (StoreInst &I);
243 void visitGetElementPtrInst(GetElementPtrInst &I);
244 void visitVAArgInst (VAArgInst &I);
246 void visitInstruction(Instruction &I) {
247 cerr << "C Writer does not know about " << I;
251 void outputLValue(Instruction *I) {
252 Out << " " << GetValueName(I) << " = ";
255 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
256 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
257 BasicBlock *Successor, unsigned Indent);
258 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
260 void printIndexingExpression(Value *Ptr, gep_type_iterator I,
261 gep_type_iterator E);
263 std::string GetValueName(const Value *Operand);
267 const int CWriter::ID = 0;
269 /// This method inserts names for any unnamed structure types that are used by
270 /// the program, and removes names from structure types that are not used by the
273 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
274 // Get a set of types that are used by the program...
275 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
277 // Loop over the module symbol table, removing types from UT that are
278 // already named, and removing names for types that are not used.
280 TypeSymbolTable &TST = M.getTypeSymbolTable();
281 for (TypeSymbolTable::iterator TI = TST.begin(), TE = TST.end();
283 TypeSymbolTable::iterator I = TI++;
285 // If this isn't a struct type, remove it from our set of types to name.
286 // This simplifies emission later.
287 if (!isa<StructType>(I->second) && !isa<OpaqueType>(I->second)) {
290 // If this is not used, remove it from the symbol table.
291 std::set<const Type *>::iterator UTI = UT.find(I->second);
295 UT.erase(UTI); // Only keep one name for this type.
299 // UT now contains types that are not named. Loop over it, naming
302 bool Changed = false;
303 unsigned RenameCounter = 0;
304 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
306 if (const StructType *ST = dyn_cast<StructType>(*I)) {
307 while (M.addTypeName("unnamed"+utostr(RenameCounter), ST))
313 // Loop over all external functions and globals. If we have two with
314 // identical names, merge them.
315 // FIXME: This code should disappear when we don't allow values with the same
316 // names when they have different types!
317 std::map<std::string, GlobalValue*> ExtSymbols;
318 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
320 if (GV->isDeclaration() && GV->hasName()) {
321 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
322 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
324 // Found a conflict, replace this global with the previous one.
325 GlobalValue *OldGV = X.first->second;
326 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
327 GV->eraseFromParent();
332 // Do the same for globals.
333 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
335 GlobalVariable *GV = I++;
336 if (GV->isDeclaration() && GV->hasName()) {
337 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
338 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
340 // Found a conflict, replace this global with the previous one.
341 GlobalValue *OldGV = X.first->second;
342 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
343 GV->eraseFromParent();
352 /// printStructReturnPointerFunctionType - This is like printType for a struct
353 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
354 /// print it as "Struct (*)(...)", for struct return functions.
355 void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
356 const PointerType *TheTy) {
357 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
358 std::stringstream FunctionInnards;
359 FunctionInnards << " (*) (";
360 bool PrintedType = false;
362 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
363 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
365 const ParamAttrsList *Attrs = FTy->getParamAttrs();
366 for (++I; I != E; ++I) {
368 FunctionInnards << ", ";
369 printType(FunctionInnards, *I,
370 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt), "");
373 if (FTy->isVarArg()) {
375 FunctionInnards << ", ...";
376 } else if (!PrintedType) {
377 FunctionInnards << "void";
379 FunctionInnards << ')';
380 std::string tstr = FunctionInnards.str();
381 printType(Out, RetTy,
382 /*isSigned=*/Attrs && Attrs->paramHasAttr(0, ParamAttr::SExt), tstr);
386 CWriter::printSimpleType(std::ostream &Out, const Type *Ty, bool isSigned,
387 const std::string &NameSoFar) {
388 assert((Ty->isPrimitiveType() || Ty->isInteger()) &&
389 "Invalid type for printSimpleType");
390 switch (Ty->getTypeID()) {
391 case Type::VoidTyID: return Out << "void " << NameSoFar;
392 case Type::IntegerTyID: {
393 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
395 return Out << "bool " << NameSoFar;
396 else if (NumBits <= 8)
397 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
398 else if (NumBits <= 16)
399 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
400 else if (NumBits <= 32)
401 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
403 assert(NumBits <= 64 && "Bit widths > 64 not implemented yet");
404 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
407 case Type::FloatTyID: return Out << "float " << NameSoFar;
408 case Type::DoubleTyID: return Out << "double " << NameSoFar;
410 cerr << "Unknown primitive type: " << *Ty << "\n";
415 // Pass the Type* and the variable name and this prints out the variable
418 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
419 bool isSigned, const std::string &NameSoFar,
421 if (Ty->isPrimitiveType() || Ty->isInteger()) {
422 printSimpleType(Out, Ty, isSigned, NameSoFar);
426 // Check to see if the type is named.
427 if (!IgnoreName || isa<OpaqueType>(Ty)) {
428 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
429 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
432 switch (Ty->getTypeID()) {
433 case Type::FunctionTyID: {
434 const FunctionType *FTy = cast<FunctionType>(Ty);
435 std::stringstream FunctionInnards;
436 FunctionInnards << " (" << NameSoFar << ") (";
437 const ParamAttrsList *Attrs = FTy->getParamAttrs();
439 for (FunctionType::param_iterator I = FTy->param_begin(),
440 E = FTy->param_end(); I != E; ++I) {
441 if (I != FTy->param_begin())
442 FunctionInnards << ", ";
443 printType(FunctionInnards, *I,
444 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt), "");
447 if (FTy->isVarArg()) {
448 if (FTy->getNumParams())
449 FunctionInnards << ", ...";
450 } else if (!FTy->getNumParams()) {
451 FunctionInnards << "void";
453 FunctionInnards << ')';
454 std::string tstr = FunctionInnards.str();
455 printType(Out, FTy->getReturnType(),
456 /*isSigned=*/Attrs && Attrs->paramHasAttr(0, ParamAttr::SExt), tstr);
459 case Type::StructTyID: {
460 const StructType *STy = cast<StructType>(Ty);
461 Out << NameSoFar + " {\n";
463 for (StructType::element_iterator I = STy->element_begin(),
464 E = STy->element_end(); I != E; ++I) {
466 printType(Out, *I, false, "field" + utostr(Idx++));
472 case Type::PointerTyID: {
473 const PointerType *PTy = cast<PointerType>(Ty);
474 std::string ptrName = "*" + NameSoFar;
476 if (isa<ArrayType>(PTy->getElementType()) ||
477 isa<VectorType>(PTy->getElementType()))
478 ptrName = "(" + ptrName + ")";
480 return printType(Out, PTy->getElementType(), false, ptrName);
483 case Type::ArrayTyID: {
484 const ArrayType *ATy = cast<ArrayType>(Ty);
485 unsigned NumElements = ATy->getNumElements();
486 if (NumElements == 0) NumElements = 1;
487 return printType(Out, ATy->getElementType(), false,
488 NameSoFar + "[" + utostr(NumElements) + "]");
491 case Type::VectorTyID: {
492 const VectorType *PTy = cast<VectorType>(Ty);
493 unsigned NumElements = PTy->getNumElements();
494 if (NumElements == 0) NumElements = 1;
495 return printType(Out, PTy->getElementType(), false,
496 NameSoFar + "[" + utostr(NumElements) + "]");
499 case Type::OpaqueTyID: {
500 static int Count = 0;
501 std::string TyName = "struct opaque_" + itostr(Count++);
502 assert(TypeNames.find(Ty) == TypeNames.end());
503 TypeNames[Ty] = TyName;
504 return Out << TyName << ' ' << NameSoFar;
507 assert(0 && "Unhandled case in getTypeProps!");
514 void CWriter::printConstantArray(ConstantArray *CPA) {
516 // As a special case, print the array as a string if it is an array of
517 // ubytes or an array of sbytes with positive values.
519 const Type *ETy = CPA->getType()->getElementType();
520 bool isString = (ETy == Type::Int8Ty || ETy == Type::Int8Ty);
522 // Make sure the last character is a null char, as automatically added by C
523 if (isString && (CPA->getNumOperands() == 0 ||
524 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
529 // Keep track of whether the last number was a hexadecimal escape
530 bool LastWasHex = false;
532 // Do not include the last character, which we know is null
533 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
534 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
536 // Print it out literally if it is a printable character. The only thing
537 // to be careful about is when the last letter output was a hex escape
538 // code, in which case we have to be careful not to print out hex digits
539 // explicitly (the C compiler thinks it is a continuation of the previous
540 // character, sheesh...)
542 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
544 if (C == '"' || C == '\\')
551 case '\n': Out << "\\n"; break;
552 case '\t': Out << "\\t"; break;
553 case '\r': Out << "\\r"; break;
554 case '\v': Out << "\\v"; break;
555 case '\a': Out << "\\a"; break;
556 case '\"': Out << "\\\""; break;
557 case '\'': Out << "\\\'"; break;
560 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
561 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
570 if (CPA->getNumOperands()) {
572 printConstant(cast<Constant>(CPA->getOperand(0)));
573 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
575 printConstant(cast<Constant>(CPA->getOperand(i)));
582 void CWriter::printConstantVector(ConstantVector *CP) {
584 if (CP->getNumOperands()) {
586 printConstant(cast<Constant>(CP->getOperand(0)));
587 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
589 printConstant(cast<Constant>(CP->getOperand(i)));
595 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
596 // textually as a double (rather than as a reference to a stack-allocated
597 // variable). We decide this by converting CFP to a string and back into a
598 // double, and then checking whether the conversion results in a bit-equal
599 // double to the original value of CFP. This depends on us and the target C
600 // compiler agreeing on the conversion process (which is pretty likely since we
601 // only deal in IEEE FP).
603 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
604 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
606 sprintf(Buffer, "%a", CFP->getValue());
608 if (!strncmp(Buffer, "0x", 2) ||
609 !strncmp(Buffer, "-0x", 3) ||
610 !strncmp(Buffer, "+0x", 3))
611 return atof(Buffer) == CFP->getValue();
614 std::string StrVal = ftostr(CFP->getValue());
616 while (StrVal[0] == ' ')
617 StrVal.erase(StrVal.begin());
619 // Check to make sure that the stringized number is not some string like "Inf"
620 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
621 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
622 ((StrVal[0] == '-' || StrVal[0] == '+') &&
623 (StrVal[1] >= '0' && StrVal[1] <= '9')))
624 // Reparse stringized version!
625 return atof(StrVal.c_str()) == CFP->getValue();
630 /// Print out the casting for a cast operation. This does the double casting
631 /// necessary for conversion to the destination type, if necessary.
632 /// @brief Print a cast
633 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
634 // Print the destination type cast
636 case Instruction::UIToFP:
637 case Instruction::SIToFP:
638 case Instruction::IntToPtr:
639 case Instruction::Trunc:
640 case Instruction::BitCast:
641 case Instruction::FPExt:
642 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
644 printType(Out, DstTy);
647 case Instruction::ZExt:
648 case Instruction::PtrToInt:
649 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
651 printSimpleType(Out, DstTy, false);
654 case Instruction::SExt:
655 case Instruction::FPToSI: // For these, make sure we get a signed dest
657 printSimpleType(Out, DstTy, true);
661 assert(0 && "Invalid cast opcode");
664 // Print the source type cast
666 case Instruction::UIToFP:
667 case Instruction::ZExt:
669 printSimpleType(Out, SrcTy, false);
672 case Instruction::SIToFP:
673 case Instruction::SExt:
675 printSimpleType(Out, SrcTy, true);
678 case Instruction::IntToPtr:
679 case Instruction::PtrToInt:
680 // Avoid "cast to pointer from integer of different size" warnings
681 Out << "(unsigned long)";
683 case Instruction::Trunc:
684 case Instruction::BitCast:
685 case Instruction::FPExt:
686 case Instruction::FPTrunc:
687 case Instruction::FPToSI:
688 case Instruction::FPToUI:
689 break; // These don't need a source cast.
691 assert(0 && "Invalid cast opcode");
696 // printConstant - The LLVM Constant to C Constant converter.
697 void CWriter::printConstant(Constant *CPV) {
698 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
699 switch (CE->getOpcode()) {
700 case Instruction::Trunc:
701 case Instruction::ZExt:
702 case Instruction::SExt:
703 case Instruction::FPTrunc:
704 case Instruction::FPExt:
705 case Instruction::UIToFP:
706 case Instruction::SIToFP:
707 case Instruction::FPToUI:
708 case Instruction::FPToSI:
709 case Instruction::PtrToInt:
710 case Instruction::IntToPtr:
711 case Instruction::BitCast:
713 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
714 if (CE->getOpcode() == Instruction::SExt &&
715 CE->getOperand(0)->getType() == Type::Int1Ty) {
716 // Make sure we really sext from bool here by subtracting from 0
719 printConstant(CE->getOperand(0));
720 if (CE->getType() == Type::Int1Ty &&
721 (CE->getOpcode() == Instruction::Trunc ||
722 CE->getOpcode() == Instruction::FPToUI ||
723 CE->getOpcode() == Instruction::FPToSI ||
724 CE->getOpcode() == Instruction::PtrToInt)) {
725 // Make sure we really truncate to bool here by anding with 1
731 case Instruction::GetElementPtr:
733 printIndexingExpression(CE->getOperand(0), gep_type_begin(CPV),
737 case Instruction::Select:
739 printConstant(CE->getOperand(0));
741 printConstant(CE->getOperand(1));
743 printConstant(CE->getOperand(2));
746 case Instruction::Add:
747 case Instruction::Sub:
748 case Instruction::Mul:
749 case Instruction::SDiv:
750 case Instruction::UDiv:
751 case Instruction::FDiv:
752 case Instruction::URem:
753 case Instruction::SRem:
754 case Instruction::FRem:
755 case Instruction::And:
756 case Instruction::Or:
757 case Instruction::Xor:
758 case Instruction::ICmp:
759 case Instruction::Shl:
760 case Instruction::LShr:
761 case Instruction::AShr:
764 bool NeedsClosingParens = printConstExprCast(CE);
765 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
766 switch (CE->getOpcode()) {
767 case Instruction::Add: Out << " + "; break;
768 case Instruction::Sub: Out << " - "; break;
769 case Instruction::Mul: Out << " * "; break;
770 case Instruction::URem:
771 case Instruction::SRem:
772 case Instruction::FRem: Out << " % "; break;
773 case Instruction::UDiv:
774 case Instruction::SDiv:
775 case Instruction::FDiv: Out << " / "; break;
776 case Instruction::And: Out << " & "; break;
777 case Instruction::Or: Out << " | "; break;
778 case Instruction::Xor: Out << " ^ "; break;
779 case Instruction::Shl: Out << " << "; break;
780 case Instruction::LShr:
781 case Instruction::AShr: Out << " >> "; break;
782 case Instruction::ICmp:
783 switch (CE->getPredicate()) {
784 case ICmpInst::ICMP_EQ: Out << " == "; break;
785 case ICmpInst::ICMP_NE: Out << " != "; break;
786 case ICmpInst::ICMP_SLT:
787 case ICmpInst::ICMP_ULT: Out << " < "; break;
788 case ICmpInst::ICMP_SLE:
789 case ICmpInst::ICMP_ULE: Out << " <= "; break;
790 case ICmpInst::ICMP_SGT:
791 case ICmpInst::ICMP_UGT: Out << " > "; break;
792 case ICmpInst::ICMP_SGE:
793 case ICmpInst::ICMP_UGE: Out << " >= "; break;
794 default: assert(0 && "Illegal ICmp predicate");
797 default: assert(0 && "Illegal opcode here!");
799 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
800 if (NeedsClosingParens)
805 case Instruction::FCmp: {
807 bool NeedsClosingParens = printConstExprCast(CE);
808 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
810 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
814 switch (CE->getPredicate()) {
815 default: assert(0 && "Illegal FCmp predicate");
816 case FCmpInst::FCMP_ORD: op = "ord"; break;
817 case FCmpInst::FCMP_UNO: op = "uno"; break;
818 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
819 case FCmpInst::FCMP_UNE: op = "une"; break;
820 case FCmpInst::FCMP_ULT: op = "ult"; break;
821 case FCmpInst::FCMP_ULE: op = "ule"; break;
822 case FCmpInst::FCMP_UGT: op = "ugt"; break;
823 case FCmpInst::FCMP_UGE: op = "uge"; break;
824 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
825 case FCmpInst::FCMP_ONE: op = "one"; break;
826 case FCmpInst::FCMP_OLT: op = "olt"; break;
827 case FCmpInst::FCMP_OLE: op = "ole"; break;
828 case FCmpInst::FCMP_OGT: op = "ogt"; break;
829 case FCmpInst::FCMP_OGE: op = "oge"; break;
831 Out << "llvm_fcmp_" << op << "(";
832 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
834 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
837 if (NeedsClosingParens)
842 cerr << "CWriter Error: Unhandled constant expression: "
846 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
848 printType(Out, CPV->getType()); // sign doesn't matter
849 Out << ")/*UNDEF*/0)";
853 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
854 const Type* Ty = CI->getType();
855 if (Ty == Type::Int1Ty)
856 Out << (CI->getZExtValue() ? '1' : '0') ;
859 printSimpleType(Out, Ty, false) << ')';
860 if (CI->isMinValue(true))
861 Out << CI->getZExtValue() << 'u';
863 Out << CI->getSExtValue();
864 if (Ty->getPrimitiveSizeInBits() > 32)
871 switch (CPV->getType()->getTypeID()) {
872 case Type::FloatTyID:
873 case Type::DoubleTyID: {
874 ConstantFP *FPC = cast<ConstantFP>(CPV);
875 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
876 if (I != FPConstantMap.end()) {
877 // Because of FP precision problems we must load from a stack allocated
878 // value that holds the value in hex.
879 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
880 << "*)&FPConstant" << I->second << ')';
882 if (IsNAN(FPC->getValue())) {
885 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
887 const unsigned long QuietNaN = 0x7ff8UL;
888 //const unsigned long SignalNaN = 0x7ff4UL;
890 // We need to grab the first part of the FP #
893 uint64_t ll = DoubleToBits(FPC->getValue());
894 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
896 std::string Num(&Buffer[0], &Buffer[6]);
897 unsigned long Val = strtoul(Num.c_str(), 0, 16);
899 if (FPC->getType() == Type::FloatTy)
900 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
901 << Buffer << "\") /*nan*/ ";
903 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
904 << Buffer << "\") /*nan*/ ";
905 } else if (IsInf(FPC->getValue())) {
907 if (FPC->getValue() < 0) Out << '-';
908 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
912 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
913 // Print out the constant as a floating point number.
915 sprintf(Buffer, "%a", FPC->getValue());
918 Num = ftostr(FPC->getValue());
926 case Type::ArrayTyID:
927 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
928 const ArrayType *AT = cast<ArrayType>(CPV->getType());
930 if (AT->getNumElements()) {
932 Constant *CZ = Constant::getNullValue(AT->getElementType());
934 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
941 printConstantArray(cast<ConstantArray>(CPV));
945 case Type::VectorTyID:
946 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
947 const VectorType *AT = cast<VectorType>(CPV->getType());
949 if (AT->getNumElements()) {
951 Constant *CZ = Constant::getNullValue(AT->getElementType());
953 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
960 printConstantVector(cast<ConstantVector>(CPV));
964 case Type::StructTyID:
965 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
966 const StructType *ST = cast<StructType>(CPV->getType());
968 if (ST->getNumElements()) {
970 printConstant(Constant::getNullValue(ST->getElementType(0)));
971 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
973 printConstant(Constant::getNullValue(ST->getElementType(i)));
979 if (CPV->getNumOperands()) {
981 printConstant(cast<Constant>(CPV->getOperand(0)));
982 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
984 printConstant(cast<Constant>(CPV->getOperand(i)));
991 case Type::PointerTyID:
992 if (isa<ConstantPointerNull>(CPV)) {
994 printType(Out, CPV->getType()); // sign doesn't matter
995 Out << ")/*NULL*/0)";
997 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
1003 cerr << "Unknown constant type: " << *CPV << "\n";
1008 // Some constant expressions need to be casted back to the original types
1009 // because their operands were casted to the expected type. This function takes
1010 // care of detecting that case and printing the cast for the ConstantExpr.
1011 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
1012 bool NeedsExplicitCast = false;
1013 const Type *Ty = CE->getOperand(0)->getType();
1014 bool TypeIsSigned = false;
1015 switch (CE->getOpcode()) {
1016 case Instruction::LShr:
1017 case Instruction::URem:
1018 case Instruction::UDiv: NeedsExplicitCast = true; break;
1019 case Instruction::AShr:
1020 case Instruction::SRem:
1021 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1022 case Instruction::SExt:
1024 NeedsExplicitCast = true;
1025 TypeIsSigned = true;
1027 case Instruction::ZExt:
1028 case Instruction::Trunc:
1029 case Instruction::FPTrunc:
1030 case Instruction::FPExt:
1031 case Instruction::UIToFP:
1032 case Instruction::SIToFP:
1033 case Instruction::FPToUI:
1034 case Instruction::FPToSI:
1035 case Instruction::PtrToInt:
1036 case Instruction::IntToPtr:
1037 case Instruction::BitCast:
1039 NeedsExplicitCast = true;
1043 if (NeedsExplicitCast) {
1045 if (Ty->isInteger() && Ty != Type::Int1Ty)
1046 printSimpleType(Out, Ty, TypeIsSigned);
1048 printType(Out, Ty); // not integer, sign doesn't matter
1051 return NeedsExplicitCast;
1054 // Print a constant assuming that it is the operand for a given Opcode. The
1055 // opcodes that care about sign need to cast their operands to the expected
1056 // type before the operation proceeds. This function does the casting.
1057 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1059 // Extract the operand's type, we'll need it.
1060 const Type* OpTy = CPV->getType();
1062 // Indicate whether to do the cast or not.
1063 bool shouldCast = false;
1064 bool typeIsSigned = false;
1066 // Based on the Opcode for which this Constant is being written, determine
1067 // the new type to which the operand should be casted by setting the value
1068 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1072 // for most instructions, it doesn't matter
1074 case Instruction::LShr:
1075 case Instruction::UDiv:
1076 case Instruction::URem:
1079 case Instruction::AShr:
1080 case Instruction::SDiv:
1081 case Instruction::SRem:
1083 typeIsSigned = true;
1087 // Write out the casted constant if we should, otherwise just write the
1091 printSimpleType(Out, OpTy, typeIsSigned);
1099 std::string CWriter::GetValueName(const Value *Operand) {
1102 if (!isa<GlobalValue>(Operand) && Operand->getName() != "") {
1103 std::string VarName;
1105 Name = Operand->getName();
1106 VarName.reserve(Name.capacity());
1108 for (std::string::iterator I = Name.begin(), E = Name.end();
1112 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1113 (ch >= '0' && ch <= '9') || ch == '_'))
1119 Name = "llvm_cbe_" + VarName;
1121 Name = Mang->getValueName(Operand);
1127 void CWriter::writeOperandInternal(Value *Operand) {
1128 if (Instruction *I = dyn_cast<Instruction>(Operand))
1129 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1130 // Should we inline this instruction to build a tree?
1137 Constant* CPV = dyn_cast<Constant>(Operand);
1139 if (CPV && !isa<GlobalValue>(CPV))
1142 Out << GetValueName(Operand);
1145 void CWriter::writeOperandRaw(Value *Operand) {
1146 Constant* CPV = dyn_cast<Constant>(Operand);
1147 if (CPV && !isa<GlobalValue>(CPV)) {
1150 Out << GetValueName(Operand);
1154 void CWriter::writeOperand(Value *Operand) {
1155 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1156 Out << "(&"; // Global variables are referenced as their addresses by llvm
1158 writeOperandInternal(Operand);
1160 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1164 // Some instructions need to have their result value casted back to the
1165 // original types because their operands were casted to the expected type.
1166 // This function takes care of detecting that case and printing the cast
1167 // for the Instruction.
1168 bool CWriter::writeInstructionCast(const Instruction &I) {
1169 const Type *Ty = I.getOperand(0)->getType();
1170 switch (I.getOpcode()) {
1171 case Instruction::LShr:
1172 case Instruction::URem:
1173 case Instruction::UDiv:
1175 printSimpleType(Out, Ty, false);
1178 case Instruction::AShr:
1179 case Instruction::SRem:
1180 case Instruction::SDiv:
1182 printSimpleType(Out, Ty, true);
1190 // Write the operand with a cast to another type based on the Opcode being used.
1191 // This will be used in cases where an instruction has specific type
1192 // requirements (usually signedness) for its operands.
1193 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1195 // Extract the operand's type, we'll need it.
1196 const Type* OpTy = Operand->getType();
1198 // Indicate whether to do the cast or not.
1199 bool shouldCast = false;
1201 // Indicate whether the cast should be to a signed type or not.
1202 bool castIsSigned = false;
1204 // Based on the Opcode for which this Operand is being written, determine
1205 // the new type to which the operand should be casted by setting the value
1206 // of OpTy. If we change OpTy, also set shouldCast to true.
1209 // for most instructions, it doesn't matter
1211 case Instruction::LShr:
1212 case Instruction::UDiv:
1213 case Instruction::URem: // Cast to unsigned first
1215 castIsSigned = false;
1217 case Instruction::AShr:
1218 case Instruction::SDiv:
1219 case Instruction::SRem: // Cast to signed first
1221 castIsSigned = true;
1225 // Write out the casted operand if we should, otherwise just write the
1229 printSimpleType(Out, OpTy, castIsSigned);
1231 writeOperand(Operand);
1234 writeOperand(Operand);
1237 // Write the operand with a cast to another type based on the icmp predicate
1239 void CWriter::writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate) {
1241 // Extract the operand's type, we'll need it.
1242 const Type* OpTy = Operand->getType();
1244 // Indicate whether to do the cast or not.
1245 bool shouldCast = false;
1247 // Indicate whether the cast should be to a signed type or not.
1248 bool castIsSigned = false;
1250 // Based on the Opcode for which this Operand is being written, determine
1251 // the new type to which the operand should be casted by setting the value
1252 // of OpTy. If we change OpTy, also set shouldCast to true.
1253 switch (predicate) {
1255 // for eq and ne, it doesn't matter
1257 case ICmpInst::ICMP_UGT:
1258 case ICmpInst::ICMP_UGE:
1259 case ICmpInst::ICMP_ULT:
1260 case ICmpInst::ICMP_ULE:
1263 case ICmpInst::ICMP_SGT:
1264 case ICmpInst::ICMP_SGE:
1265 case ICmpInst::ICMP_SLT:
1266 case ICmpInst::ICMP_SLE:
1268 castIsSigned = true;
1272 // Write out the casted operand if we should, otherwise just write the
1276 if (OpTy->isInteger() && OpTy != Type::Int1Ty)
1277 printSimpleType(Out, OpTy, castIsSigned);
1279 printType(Out, OpTy); // not integer, sign doesn't matter
1281 writeOperand(Operand);
1284 writeOperand(Operand);
1287 // generateCompilerSpecificCode - This is where we add conditional compilation
1288 // directives to cater to specific compilers as need be.
1290 static void generateCompilerSpecificCode(std::ostream& Out) {
1291 // Alloca is hard to get, and we don't want to include stdlib.h here.
1292 Out << "/* get a declaration for alloca */\n"
1293 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1294 << "#define alloca(x) __builtin_alloca((x))\n"
1295 << "#define _alloca(x) __builtin_alloca((x))\n"
1296 << "#elif defined(__APPLE__)\n"
1297 << "extern void *__builtin_alloca(unsigned long);\n"
1298 << "#define alloca(x) __builtin_alloca(x)\n"
1299 << "#define longjmp _longjmp\n"
1300 << "#define setjmp _setjmp\n"
1301 << "#elif defined(__sun__)\n"
1302 << "#if defined(__sparcv9)\n"
1303 << "extern void *__builtin_alloca(unsigned long);\n"
1305 << "extern void *__builtin_alloca(unsigned int);\n"
1307 << "#define alloca(x) __builtin_alloca(x)\n"
1308 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1309 << "#define alloca(x) __builtin_alloca(x)\n"
1310 << "#elif defined(_MSC_VER)\n"
1311 << "#define inline _inline\n"
1312 << "#define alloca(x) _alloca(x)\n"
1314 << "#include <alloca.h>\n"
1317 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1318 // If we aren't being compiled with GCC, just drop these attributes.
1319 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1320 << "#define __attribute__(X)\n"
1323 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1324 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1325 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1326 << "#elif defined(__GNUC__)\n"
1327 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1329 << "#define __EXTERNAL_WEAK__\n"
1332 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1333 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1334 << "#define __ATTRIBUTE_WEAK__\n"
1335 << "#elif defined(__GNUC__)\n"
1336 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1338 << "#define __ATTRIBUTE_WEAK__\n"
1341 // Add hidden visibility support. FIXME: APPLE_CC?
1342 Out << "#if defined(__GNUC__)\n"
1343 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1346 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1347 // From the GCC documentation:
1349 // double __builtin_nan (const char *str)
1351 // This is an implementation of the ISO C99 function nan.
1353 // Since ISO C99 defines this function in terms of strtod, which we do
1354 // not implement, a description of the parsing is in order. The string is
1355 // parsed as by strtol; that is, the base is recognized by leading 0 or
1356 // 0x prefixes. The number parsed is placed in the significand such that
1357 // the least significant bit of the number is at the least significant
1358 // bit of the significand. The number is truncated to fit the significand
1359 // field provided. The significand is forced to be a quiet NaN.
1361 // This function, if given a string literal, is evaluated early enough
1362 // that it is considered a compile-time constant.
1364 // float __builtin_nanf (const char *str)
1366 // Similar to __builtin_nan, except the return type is float.
1368 // double __builtin_inf (void)
1370 // Similar to __builtin_huge_val, except a warning is generated if the
1371 // target floating-point format does not support infinities. This
1372 // function is suitable for implementing the ISO C99 macro INFINITY.
1374 // float __builtin_inff (void)
1376 // Similar to __builtin_inf, except the return type is float.
1377 Out << "#ifdef __GNUC__\n"
1378 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1379 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1380 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1381 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1382 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1383 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1384 << "#define LLVM_PREFETCH(addr,rw,locality) "
1385 "__builtin_prefetch(addr,rw,locality)\n"
1386 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1387 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1388 << "#define LLVM_ASM __asm__\n"
1390 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1391 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1392 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1393 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1394 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1395 << "#define LLVM_INFF 0.0F /* Float */\n"
1396 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1397 << "#define __ATTRIBUTE_CTOR__\n"
1398 << "#define __ATTRIBUTE_DTOR__\n"
1399 << "#define LLVM_ASM(X)\n"
1402 // Output target-specific code that should be inserted into main.
1403 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1404 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1405 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1406 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1407 << "defined(__x86_64__)\n"
1408 << "#undef CODE_FOR_MAIN\n"
1409 << "#define CODE_FOR_MAIN() \\\n"
1410 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1411 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1412 << "#endif\n#endif\n";
1416 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1417 /// the StaticTors set.
1418 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1419 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1420 if (!InitList) return;
1422 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1423 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1424 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1426 if (CS->getOperand(1)->isNullValue())
1427 return; // Found a null terminator, exit printing.
1428 Constant *FP = CS->getOperand(1);
1429 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1431 FP = CE->getOperand(0);
1432 if (Function *F = dyn_cast<Function>(FP))
1433 StaticTors.insert(F);
1437 enum SpecialGlobalClass {
1439 GlobalCtors, GlobalDtors,
1443 /// getGlobalVariableClass - If this is a global that is specially recognized
1444 /// by LLVM, return a code that indicates how we should handle it.
1445 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1446 // If this is a global ctors/dtors list, handle it now.
1447 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1448 if (GV->getName() == "llvm.global_ctors")
1450 else if (GV->getName() == "llvm.global_dtors")
1454 // Otherwise, it it is other metadata, don't print it. This catches things
1455 // like debug information.
1456 if (GV->getSection() == "llvm.metadata")
1463 bool CWriter::doInitialization(Module &M) {
1467 TD = new TargetData(&M);
1468 IL = new IntrinsicLowering(*TD);
1469 IL->AddPrototypes(M);
1471 // Ensure that all structure types have names...
1472 Mang = new Mangler(M);
1473 Mang->markCharUnacceptable('.');
1475 // Keep track of which functions are static ctors/dtors so they can have
1476 // an attribute added to their prototypes.
1477 std::set<Function*> StaticCtors, StaticDtors;
1478 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1480 switch (getGlobalVariableClass(I)) {
1483 FindStaticTors(I, StaticCtors);
1486 FindStaticTors(I, StaticDtors);
1491 // get declaration for alloca
1492 Out << "/* Provide Declarations */\n";
1493 Out << "#include <stdarg.h>\n"; // Varargs support
1494 Out << "#include <setjmp.h>\n"; // Unwind support
1495 generateCompilerSpecificCode(Out);
1497 // Provide a definition for `bool' if not compiling with a C++ compiler.
1499 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1501 << "\n\n/* Support for floating point constants */\n"
1502 << "typedef unsigned long long ConstantDoubleTy;\n"
1503 << "typedef unsigned int ConstantFloatTy;\n"
1505 << "\n\n/* Global Declarations */\n";
1507 // First output all the declarations for the program, because C requires
1508 // Functions & globals to be declared before they are used.
1511 // Loop over the symbol table, emitting all named constants...
1512 printModuleTypes(M.getTypeSymbolTable());
1514 // Global variable declarations...
1515 if (!M.global_empty()) {
1516 Out << "\n/* External Global Variable Declarations */\n";
1517 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1520 if (I->hasExternalLinkage() || I->hasExternalWeakLinkage())
1522 else if (I->hasDLLImportLinkage())
1523 Out << "__declspec(dllimport) ";
1525 continue; // Internal Global
1527 // Thread Local Storage
1528 if (I->isThreadLocal())
1531 printType(Out, I->getType()->getElementType(), false, GetValueName(I));
1533 if (I->hasExternalWeakLinkage())
1534 Out << " __EXTERNAL_WEAK__";
1539 // Function declarations
1540 Out << "\n/* Function Declarations */\n";
1541 Out << "double fmod(double, double);\n"; // Support for FP rem
1542 Out << "float fmodf(float, float);\n";
1544 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1545 // Don't print declarations for intrinsic functions.
1546 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1547 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1548 if (I->hasExternalWeakLinkage())
1550 printFunctionSignature(I, true);
1551 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1552 Out << " __ATTRIBUTE_WEAK__";
1553 if (I->hasExternalWeakLinkage())
1554 Out << " __EXTERNAL_WEAK__";
1555 if (StaticCtors.count(I))
1556 Out << " __ATTRIBUTE_CTOR__";
1557 if (StaticDtors.count(I))
1558 Out << " __ATTRIBUTE_DTOR__";
1559 if (I->hasHiddenVisibility())
1560 Out << " __HIDDEN__";
1562 if (I->hasName() && I->getName()[0] == 1)
1563 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1569 // Output the global variable declarations
1570 if (!M.global_empty()) {
1571 Out << "\n\n/* Global Variable Declarations */\n";
1572 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1574 if (!I->isDeclaration()) {
1575 // Ignore special globals, such as debug info.
1576 if (getGlobalVariableClass(I))
1579 if (I->hasInternalLinkage())
1584 // Thread Local Storage
1585 if (I->isThreadLocal())
1588 printType(Out, I->getType()->getElementType(), false,
1591 if (I->hasLinkOnceLinkage())
1592 Out << " __attribute__((common))";
1593 else if (I->hasWeakLinkage())
1594 Out << " __ATTRIBUTE_WEAK__";
1595 else if (I->hasExternalWeakLinkage())
1596 Out << " __EXTERNAL_WEAK__";
1597 if (I->hasHiddenVisibility())
1598 Out << " __HIDDEN__";
1603 // Output the global variable definitions and contents...
1604 if (!M.global_empty()) {
1605 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1606 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1608 if (!I->isDeclaration()) {
1609 // Ignore special globals, such as debug info.
1610 if (getGlobalVariableClass(I))
1613 if (I->hasInternalLinkage())
1615 else if (I->hasDLLImportLinkage())
1616 Out << "__declspec(dllimport) ";
1617 else if (I->hasDLLExportLinkage())
1618 Out << "__declspec(dllexport) ";
1620 // Thread Local Storage
1621 if (I->isThreadLocal())
1624 printType(Out, I->getType()->getElementType(), false,
1626 if (I->hasLinkOnceLinkage())
1627 Out << " __attribute__((common))";
1628 else if (I->hasWeakLinkage())
1629 Out << " __ATTRIBUTE_WEAK__";
1631 if (I->hasHiddenVisibility())
1632 Out << " __HIDDEN__";
1634 // If the initializer is not null, emit the initializer. If it is null,
1635 // we try to avoid emitting large amounts of zeros. The problem with
1636 // this, however, occurs when the variable has weak linkage. In this
1637 // case, the assembler will complain about the variable being both weak
1638 // and common, so we disable this optimization.
1639 if (!I->getInitializer()->isNullValue()) {
1641 writeOperand(I->getInitializer());
1642 } else if (I->hasWeakLinkage()) {
1643 // We have to specify an initializer, but it doesn't have to be
1644 // complete. If the value is an aggregate, print out { 0 }, and let
1645 // the compiler figure out the rest of the zeros.
1647 if (isa<StructType>(I->getInitializer()->getType()) ||
1648 isa<ArrayType>(I->getInitializer()->getType()) ||
1649 isa<VectorType>(I->getInitializer()->getType())) {
1652 // Just print it out normally.
1653 writeOperand(I->getInitializer());
1661 Out << "\n\n/* Function Bodies */\n";
1663 // Emit some helper functions for dealing with FCMP instruction's
1665 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1666 Out << "return X == X && Y == Y; }\n";
1667 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1668 Out << "return X != X || Y != Y; }\n";
1669 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1670 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1671 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1672 Out << "return X != Y; }\n";
1673 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1674 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1675 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1676 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1677 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1678 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1679 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1680 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1681 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1682 Out << "return X == Y ; }\n";
1683 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1684 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1685 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1686 Out << "return X < Y ; }\n";
1687 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1688 Out << "return X > Y ; }\n";
1689 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1690 Out << "return X <= Y ; }\n";
1691 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1692 Out << "return X >= Y ; }\n";
1697 /// Output all floating point constants that cannot be printed accurately...
1698 void CWriter::printFloatingPointConstants(Function &F) {
1699 // Scan the module for floating point constants. If any FP constant is used
1700 // in the function, we want to redirect it here so that we do not depend on
1701 // the precision of the printed form, unless the printed form preserves
1704 static unsigned FPCounter = 0;
1705 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1707 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1708 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1709 !FPConstantMap.count(FPC)) {
1710 double Val = FPC->getValue();
1712 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1714 if (FPC->getType() == Type::DoubleTy) {
1715 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1716 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1717 << "ULL; /* " << Val << " */\n";
1718 } else if (FPC->getType() == Type::FloatTy) {
1719 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1720 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1721 << "U; /* " << Val << " */\n";
1723 assert(0 && "Unknown float type!");
1730 /// printSymbolTable - Run through symbol table looking for type names. If a
1731 /// type name is found, emit its declaration...
1733 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1734 Out << "/* Helper union for bitcasts */\n";
1735 Out << "typedef union {\n";
1736 Out << " unsigned int Int32;\n";
1737 Out << " unsigned long long Int64;\n";
1738 Out << " float Float;\n";
1739 Out << " double Double;\n";
1740 Out << "} llvmBitCastUnion;\n";
1742 // We are only interested in the type plane of the symbol table.
1743 TypeSymbolTable::const_iterator I = TST.begin();
1744 TypeSymbolTable::const_iterator End = TST.end();
1746 // If there are no type names, exit early.
1747 if (I == End) return;
1749 // Print out forward declarations for structure types before anything else!
1750 Out << "/* Structure forward decls */\n";
1751 for (; I != End; ++I) {
1752 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1753 Out << Name << ";\n";
1754 TypeNames.insert(std::make_pair(I->second, Name));
1759 // Now we can print out typedefs. Above, we guaranteed that this can only be
1760 // for struct or opaque types.
1761 Out << "/* Typedefs */\n";
1762 for (I = TST.begin(); I != End; ++I) {
1763 std::string Name = "l_" + Mang->makeNameProper(I->first);
1765 printType(Out, I->second, false, Name);
1771 // Keep track of which structures have been printed so far...
1772 std::set<const StructType *> StructPrinted;
1774 // Loop over all structures then push them into the stack so they are
1775 // printed in the correct order.
1777 Out << "/* Structure contents */\n";
1778 for (I = TST.begin(); I != End; ++I)
1779 if (const StructType *STy = dyn_cast<StructType>(I->second))
1780 // Only print out used types!
1781 printContainedStructs(STy, StructPrinted);
1784 // Push the struct onto the stack and recursively push all structs
1785 // this one depends on.
1787 // TODO: Make this work properly with vector types
1789 void CWriter::printContainedStructs(const Type *Ty,
1790 std::set<const StructType*> &StructPrinted){
1791 // Don't walk through pointers.
1792 if (isa<PointerType>(Ty) || Ty->isPrimitiveType() || Ty->isInteger()) return;
1794 // Print all contained types first.
1795 for (Type::subtype_iterator I = Ty->subtype_begin(),
1796 E = Ty->subtype_end(); I != E; ++I)
1797 printContainedStructs(*I, StructPrinted);
1799 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1800 // Check to see if we have already printed this struct.
1801 if (StructPrinted.insert(STy).second) {
1802 // Print structure type out.
1803 std::string Name = TypeNames[STy];
1804 printType(Out, STy, false, Name, true);
1810 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1811 /// isStructReturn - Should this function actually return a struct by-value?
1812 bool isStructReturn = F->getFunctionType()->isStructReturn();
1814 if (F->hasInternalLinkage()) Out << "static ";
1815 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1816 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1817 switch (F->getCallingConv()) {
1818 case CallingConv::X86_StdCall:
1819 Out << "__stdcall ";
1821 case CallingConv::X86_FastCall:
1822 Out << "__fastcall ";
1826 // Loop over the arguments, printing them...
1827 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1828 const ParamAttrsList *Attrs = FT->getParamAttrs();
1830 std::stringstream FunctionInnards;
1832 // Print out the name...
1833 FunctionInnards << GetValueName(F) << '(';
1835 bool PrintedArg = false;
1836 if (!F->isDeclaration()) {
1837 if (!F->arg_empty()) {
1838 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1840 // If this is a struct-return function, don't print the hidden
1841 // struct-return argument.
1842 if (isStructReturn) {
1843 assert(I != E && "Invalid struct return function!");
1847 std::string ArgName;
1849 for (; I != E; ++I) {
1850 if (PrintedArg) FunctionInnards << ", ";
1851 if (I->hasName() || !Prototype)
1852 ArgName = GetValueName(I);
1855 printType(FunctionInnards, I->getType(),
1856 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt),
1863 // Loop over the arguments, printing them.
1864 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1866 // If this is a struct-return function, don't print the hidden
1867 // struct-return argument.
1868 if (isStructReturn) {
1869 assert(I != E && "Invalid struct return function!");
1874 for (; I != E; ++I) {
1875 if (PrintedArg) FunctionInnards << ", ";
1876 printType(FunctionInnards, *I,
1877 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt));
1883 // Finish printing arguments... if this is a vararg function, print the ...,
1884 // unless there are no known types, in which case, we just emit ().
1886 if (FT->isVarArg() && PrintedArg) {
1887 if (PrintedArg) FunctionInnards << ", ";
1888 FunctionInnards << "..."; // Output varargs portion of signature!
1889 } else if (!FT->isVarArg() && !PrintedArg) {
1890 FunctionInnards << "void"; // ret() -> ret(void) in C.
1892 FunctionInnards << ')';
1894 // Get the return tpe for the function.
1896 if (!isStructReturn)
1897 RetTy = F->getReturnType();
1899 // If this is a struct-return function, print the struct-return type.
1900 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1903 // Print out the return type and the signature built above.
1904 printType(Out, RetTy,
1905 /*isSigned=*/ Attrs && Attrs->paramHasAttr(0, ParamAttr::SExt),
1906 FunctionInnards.str());
1909 static inline bool isFPIntBitCast(const Instruction &I) {
1910 if (!isa<BitCastInst>(I))
1912 const Type *SrcTy = I.getOperand(0)->getType();
1913 const Type *DstTy = I.getType();
1914 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1915 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1918 void CWriter::printFunction(Function &F) {
1919 /// isStructReturn - Should this function actually return a struct by-value?
1920 bool isStructReturn = F.getFunctionType()->isStructReturn();
1922 printFunctionSignature(&F, false);
1925 // If this is a struct return function, handle the result with magic.
1926 if (isStructReturn) {
1927 const Type *StructTy =
1928 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1930 printType(Out, StructTy, false, "StructReturn");
1931 Out << "; /* Struct return temporary */\n";
1934 printType(Out, F.arg_begin()->getType(), false,
1935 GetValueName(F.arg_begin()));
1936 Out << " = &StructReturn;\n";
1939 bool PrintedVar = false;
1941 // print local variable information for the function
1942 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1943 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1945 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
1946 Out << "; /* Address-exposed local */\n";
1948 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1950 printType(Out, I->getType(), false, GetValueName(&*I));
1953 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1955 printType(Out, I->getType(), false,
1956 GetValueName(&*I)+"__PHI_TEMPORARY");
1961 // We need a temporary for the BitCast to use so it can pluck a value out
1962 // of a union to do the BitCast. This is separate from the need for a
1963 // variable to hold the result of the BitCast.
1964 if (isFPIntBitCast(*I)) {
1965 Out << " llvmBitCastUnion " << GetValueName(&*I)
1966 << "__BITCAST_TEMPORARY;\n";
1974 if (F.hasExternalLinkage() && F.getName() == "main")
1975 Out << " CODE_FOR_MAIN();\n";
1977 // print the basic blocks
1978 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1979 if (Loop *L = LI->getLoopFor(BB)) {
1980 if (L->getHeader() == BB && L->getParentLoop() == 0)
1983 printBasicBlock(BB);
1990 void CWriter::printLoop(Loop *L) {
1991 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1992 << "' to make GCC happy */\n";
1993 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1994 BasicBlock *BB = L->getBlocks()[i];
1995 Loop *BBLoop = LI->getLoopFor(BB);
1997 printBasicBlock(BB);
1998 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
2001 Out << " } while (1); /* end of syntactic loop '"
2002 << L->getHeader()->getName() << "' */\n";
2005 void CWriter::printBasicBlock(BasicBlock *BB) {
2007 // Don't print the label for the basic block if there are no uses, or if
2008 // the only terminator use is the predecessor basic block's terminator.
2009 // We have to scan the use list because PHI nodes use basic blocks too but
2010 // do not require a label to be generated.
2012 bool NeedsLabel = false;
2013 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
2014 if (isGotoCodeNecessary(*PI, BB)) {
2019 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
2021 // Output all of the instructions in the basic block...
2022 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
2024 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2025 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
2034 // Don't emit prefix or suffix for the terminator...
2035 visit(*BB->getTerminator());
2039 // Specific Instruction type classes... note that all of the casts are
2040 // necessary because we use the instruction classes as opaque types...
2042 void CWriter::visitReturnInst(ReturnInst &I) {
2043 // If this is a struct return function, return the temporary struct.
2044 bool isStructReturn = I.getParent()->getParent()->
2045 getFunctionType()->isStructReturn();
2047 if (isStructReturn) {
2048 Out << " return StructReturn;\n";
2052 // Don't output a void return if this is the last basic block in the function
2053 if (I.getNumOperands() == 0 &&
2054 &*--I.getParent()->getParent()->end() == I.getParent() &&
2055 !I.getParent()->size() == 1) {
2060 if (I.getNumOperands()) {
2062 writeOperand(I.getOperand(0));
2067 void CWriter::visitSwitchInst(SwitchInst &SI) {
2070 writeOperand(SI.getOperand(0));
2071 Out << ") {\n default:\n";
2072 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2073 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2075 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2077 writeOperand(SI.getOperand(i));
2079 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2080 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2081 printBranchToBlock(SI.getParent(), Succ, 2);
2082 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
2088 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2089 Out << " /*UNREACHABLE*/;\n";
2092 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2093 /// FIXME: This should be reenabled, but loop reordering safe!!
2096 if (next(Function::iterator(From)) != Function::iterator(To))
2097 return true; // Not the direct successor, we need a goto.
2099 //isa<SwitchInst>(From->getTerminator())
2101 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2106 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2107 BasicBlock *Successor,
2109 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2110 PHINode *PN = cast<PHINode>(I);
2111 // Now we have to do the printing.
2112 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2113 if (!isa<UndefValue>(IV)) {
2114 Out << std::string(Indent, ' ');
2115 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2117 Out << "; /* for PHI node */\n";
2122 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2124 if (isGotoCodeNecessary(CurBB, Succ)) {
2125 Out << std::string(Indent, ' ') << " goto ";
2131 // Branch instruction printing - Avoid printing out a branch to a basic block
2132 // that immediately succeeds the current one.
2134 void CWriter::visitBranchInst(BranchInst &I) {
2136 if (I.isConditional()) {
2137 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2139 writeOperand(I.getCondition());
2142 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2143 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2145 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2146 Out << " } else {\n";
2147 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2148 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2151 // First goto not necessary, assume second one is...
2153 writeOperand(I.getCondition());
2156 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2157 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2162 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2163 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2168 // PHI nodes get copied into temporary values at the end of predecessor basic
2169 // blocks. We now need to copy these temporary values into the REAL value for
2171 void CWriter::visitPHINode(PHINode &I) {
2173 Out << "__PHI_TEMPORARY";
2177 void CWriter::visitBinaryOperator(Instruction &I) {
2178 // binary instructions, shift instructions, setCond instructions.
2179 assert(!isa<PointerType>(I.getType()));
2181 // We must cast the results of binary operations which might be promoted.
2182 bool needsCast = false;
2183 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2184 || (I.getType() == Type::FloatTy)) {
2187 printType(Out, I.getType(), false);
2191 // If this is a negation operation, print it out as such. For FP, we don't
2192 // want to print "-0.0 - X".
2193 if (BinaryOperator::isNeg(&I)) {
2195 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2197 } else if (I.getOpcode() == Instruction::FRem) {
2198 // Output a call to fmod/fmodf instead of emitting a%b
2199 if (I.getType() == Type::FloatTy)
2203 writeOperand(I.getOperand(0));
2205 writeOperand(I.getOperand(1));
2209 // Write out the cast of the instruction's value back to the proper type
2211 bool NeedsClosingParens = writeInstructionCast(I);
2213 // Certain instructions require the operand to be forced to a specific type
2214 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2215 // below for operand 1
2216 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2218 switch (I.getOpcode()) {
2219 case Instruction::Add: Out << " + "; break;
2220 case Instruction::Sub: Out << " - "; break;
2221 case Instruction::Mul: Out << " * "; break;
2222 case Instruction::URem:
2223 case Instruction::SRem:
2224 case Instruction::FRem: Out << " % "; break;
2225 case Instruction::UDiv:
2226 case Instruction::SDiv:
2227 case Instruction::FDiv: Out << " / "; break;
2228 case Instruction::And: Out << " & "; break;
2229 case Instruction::Or: Out << " | "; break;
2230 case Instruction::Xor: Out << " ^ "; break;
2231 case Instruction::Shl : Out << " << "; break;
2232 case Instruction::LShr:
2233 case Instruction::AShr: Out << " >> "; break;
2234 default: cerr << "Invalid operator type!" << I; abort();
2237 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2238 if (NeedsClosingParens)
2247 void CWriter::visitICmpInst(ICmpInst &I) {
2248 // We must cast the results of icmp which might be promoted.
2249 bool needsCast = false;
2251 // Write out the cast of the instruction's value back to the proper type
2253 bool NeedsClosingParens = writeInstructionCast(I);
2255 // Certain icmp predicate require the operand to be forced to a specific type
2256 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2257 // below for operand 1
2258 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2260 switch (I.getPredicate()) {
2261 case ICmpInst::ICMP_EQ: Out << " == "; break;
2262 case ICmpInst::ICMP_NE: Out << " != "; break;
2263 case ICmpInst::ICMP_ULE:
2264 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2265 case ICmpInst::ICMP_UGE:
2266 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2267 case ICmpInst::ICMP_ULT:
2268 case ICmpInst::ICMP_SLT: Out << " < "; break;
2269 case ICmpInst::ICMP_UGT:
2270 case ICmpInst::ICMP_SGT: Out << " > "; break;
2271 default: cerr << "Invalid icmp predicate!" << I; abort();
2274 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2275 if (NeedsClosingParens)
2283 void CWriter::visitFCmpInst(FCmpInst &I) {
2284 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2288 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2294 switch (I.getPredicate()) {
2295 default: assert(0 && "Illegal FCmp predicate");
2296 case FCmpInst::FCMP_ORD: op = "ord"; break;
2297 case FCmpInst::FCMP_UNO: op = "uno"; break;
2298 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2299 case FCmpInst::FCMP_UNE: op = "une"; break;
2300 case FCmpInst::FCMP_ULT: op = "ult"; break;
2301 case FCmpInst::FCMP_ULE: op = "ule"; break;
2302 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2303 case FCmpInst::FCMP_UGE: op = "uge"; break;
2304 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2305 case FCmpInst::FCMP_ONE: op = "one"; break;
2306 case FCmpInst::FCMP_OLT: op = "olt"; break;
2307 case FCmpInst::FCMP_OLE: op = "ole"; break;
2308 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2309 case FCmpInst::FCMP_OGE: op = "oge"; break;
2312 Out << "llvm_fcmp_" << op << "(";
2313 // Write the first operand
2314 writeOperand(I.getOperand(0));
2316 // Write the second operand
2317 writeOperand(I.getOperand(1));
2321 static const char * getFloatBitCastField(const Type *Ty) {
2322 switch (Ty->getTypeID()) {
2323 default: assert(0 && "Invalid Type");
2324 case Type::FloatTyID: return "Float";
2325 case Type::DoubleTyID: return "Double";
2326 case Type::IntegerTyID: {
2327 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2336 void CWriter::visitCastInst(CastInst &I) {
2337 const Type *DstTy = I.getType();
2338 const Type *SrcTy = I.getOperand(0)->getType();
2340 if (isFPIntBitCast(I)) {
2341 // These int<->float and long<->double casts need to be handled specially
2342 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2343 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2344 writeOperand(I.getOperand(0));
2345 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2346 << getFloatBitCastField(I.getType());
2348 printCast(I.getOpcode(), SrcTy, DstTy);
2349 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::Int1Ty) {
2350 // Make sure we really get a sext from bool by subtracing the bool from 0
2353 writeOperand(I.getOperand(0));
2354 if (DstTy == Type::Int1Ty &&
2355 (I.getOpcode() == Instruction::Trunc ||
2356 I.getOpcode() == Instruction::FPToUI ||
2357 I.getOpcode() == Instruction::FPToSI ||
2358 I.getOpcode() == Instruction::PtrToInt)) {
2359 // Make sure we really get a trunc to bool by anding the operand with 1
2366 void CWriter::visitSelectInst(SelectInst &I) {
2368 writeOperand(I.getCondition());
2370 writeOperand(I.getTrueValue());
2372 writeOperand(I.getFalseValue());
2377 void CWriter::lowerIntrinsics(Function &F) {
2378 // This is used to keep track of intrinsics that get generated to a lowered
2379 // function. We must generate the prototypes before the function body which
2380 // will only be expanded on first use (by the loop below).
2381 std::vector<Function*> prototypesToGen;
2383 // Examine all the instructions in this function to find the intrinsics that
2384 // need to be lowered.
2385 for (Function::iterator BB = F.begin(), EE = F.end(); BB != EE; ++BB)
2386 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2387 if (CallInst *CI = dyn_cast<CallInst>(I++))
2388 if (Function *F = CI->getCalledFunction())
2389 switch (F->getIntrinsicID()) {
2390 case Intrinsic::not_intrinsic:
2391 case Intrinsic::vastart:
2392 case Intrinsic::vacopy:
2393 case Intrinsic::vaend:
2394 case Intrinsic::returnaddress:
2395 case Intrinsic::frameaddress:
2396 case Intrinsic::setjmp:
2397 case Intrinsic::longjmp:
2398 case Intrinsic::prefetch:
2399 case Intrinsic::dbg_stoppoint:
2400 case Intrinsic::powi_f32:
2401 case Intrinsic::powi_f64:
2402 // We directly implement these intrinsics
2405 // If this is an intrinsic that directly corresponds to a GCC
2406 // builtin, we handle it.
2407 const char *BuiltinName = "";
2408 #define GET_GCC_BUILTIN_NAME
2409 #include "llvm/Intrinsics.gen"
2410 #undef GET_GCC_BUILTIN_NAME
2411 // If we handle it, don't lower it.
2412 if (BuiltinName[0]) break;
2414 // All other intrinsic calls we must lower.
2415 Instruction *Before = 0;
2416 if (CI != &BB->front())
2417 Before = prior(BasicBlock::iterator(CI));
2419 IL->LowerIntrinsicCall(CI);
2420 if (Before) { // Move iterator to instruction after call
2425 // If the intrinsic got lowered to another call, and that call has
2426 // a definition then we need to make sure its prototype is emitted
2427 // before any calls to it.
2428 if (CallInst *Call = dyn_cast<CallInst>(I))
2429 if (Function *NewF = Call->getCalledFunction())
2430 if (!NewF->isDeclaration())
2431 prototypesToGen.push_back(NewF);
2436 // We may have collected some prototypes to emit in the loop above.
2437 // Emit them now, before the function that uses them is emitted. But,
2438 // be careful not to emit them twice.
2439 std::vector<Function*>::iterator I = prototypesToGen.begin();
2440 std::vector<Function*>::iterator E = prototypesToGen.end();
2441 for ( ; I != E; ++I) {
2442 if (intrinsicPrototypesAlreadyGenerated.insert(*I).second) {
2444 printFunctionSignature(*I, true);
2451 void CWriter::visitCallInst(CallInst &I) {
2452 //check if we have inline asm
2453 if (isInlineAsm(I)) {
2458 bool WroteCallee = false;
2460 // Handle intrinsic function calls first...
2461 if (Function *F = I.getCalledFunction())
2462 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2465 // If this is an intrinsic that directly corresponds to a GCC
2466 // builtin, we emit it here.
2467 const char *BuiltinName = "";
2468 #define GET_GCC_BUILTIN_NAME
2469 #include "llvm/Intrinsics.gen"
2470 #undef GET_GCC_BUILTIN_NAME
2471 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2477 case Intrinsic::vastart:
2480 Out << "va_start(*(va_list*)";
2481 writeOperand(I.getOperand(1));
2483 // Output the last argument to the enclosing function...
2484 if (I.getParent()->getParent()->arg_empty()) {
2485 cerr << "The C backend does not currently support zero "
2486 << "argument varargs functions, such as '"
2487 << I.getParent()->getParent()->getName() << "'!\n";
2490 writeOperand(--I.getParent()->getParent()->arg_end());
2493 case Intrinsic::vaend:
2494 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2495 Out << "0; va_end(*(va_list*)";
2496 writeOperand(I.getOperand(1));
2499 Out << "va_end(*(va_list*)0)";
2502 case Intrinsic::vacopy:
2504 Out << "va_copy(*(va_list*)";
2505 writeOperand(I.getOperand(1));
2506 Out << ", *(va_list*)";
2507 writeOperand(I.getOperand(2));
2510 case Intrinsic::returnaddress:
2511 Out << "__builtin_return_address(";
2512 writeOperand(I.getOperand(1));
2515 case Intrinsic::frameaddress:
2516 Out << "__builtin_frame_address(";
2517 writeOperand(I.getOperand(1));
2520 case Intrinsic::powi_f32:
2521 case Intrinsic::powi_f64:
2522 Out << "__builtin_powi(";
2523 writeOperand(I.getOperand(1));
2525 writeOperand(I.getOperand(2));
2528 case Intrinsic::setjmp:
2529 Out << "setjmp(*(jmp_buf*)";
2530 writeOperand(I.getOperand(1));
2533 case Intrinsic::longjmp:
2534 Out << "longjmp(*(jmp_buf*)";
2535 writeOperand(I.getOperand(1));
2537 writeOperand(I.getOperand(2));
2540 case Intrinsic::prefetch:
2541 Out << "LLVM_PREFETCH((const void *)";
2542 writeOperand(I.getOperand(1));
2544 writeOperand(I.getOperand(2));
2546 writeOperand(I.getOperand(3));
2549 case Intrinsic::dbg_stoppoint: {
2550 // If we use writeOperand directly we get a "u" suffix which is rejected
2552 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2556 << " \"" << SPI.getDirectory()
2557 << SPI.getFileName() << "\"\n";
2563 Value *Callee = I.getCalledValue();
2565 const PointerType *PTy = cast<PointerType>(Callee->getType());
2566 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2568 // If this is a call to a struct-return function, assign to the first
2569 // parameter instead of passing it to the call.
2570 bool isStructRet = FTy->isStructReturn();
2573 writeOperand(I.getOperand(1));
2577 if (I.isTailCall()) Out << " /*tail*/ ";
2580 // If this is an indirect call to a struct return function, we need to cast
2582 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2584 // GCC is a real PITA. It does not permit codegening casts of functions to
2585 // function pointers if they are in a call (it generates a trap instruction
2586 // instead!). We work around this by inserting a cast to void* in between
2587 // the function and the function pointer cast. Unfortunately, we can't just
2588 // form the constant expression here, because the folder will immediately
2591 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2592 // that void* and function pointers have the same size. :( To deal with this
2593 // in the common case, we handle casts where the number of arguments passed
2596 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2598 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2604 // Ok, just cast the pointer type.
2607 printType(Out, I.getCalledValue()->getType());
2609 printStructReturnPointerFunctionType(Out,
2610 cast<PointerType>(I.getCalledValue()->getType()));
2613 writeOperand(Callee);
2614 if (NeedsCast) Out << ')';
2619 unsigned NumDeclaredParams = FTy->getNumParams();
2621 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2623 if (isStructRet) { // Skip struct return argument.
2628 const ParamAttrsList *Attrs = FTy->getParamAttrs();
2629 bool PrintedArg = false;
2631 for (; AI != AE; ++AI, ++ArgNo, ++Idx) {
2632 if (PrintedArg) Out << ", ";
2633 if (ArgNo < NumDeclaredParams &&
2634 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2636 printType(Out, FTy->getParamType(ArgNo),
2637 /*isSigned=*/Attrs && Attrs->paramHasAttr(Idx, ParamAttr::SExt));
2647 //This converts the llvm constraint string to something gcc is expecting.
2648 //TODO: work out platform independent constraints and factor those out
2649 // of the per target tables
2650 // handle multiple constraint codes
2651 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2653 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2655 const char** table = 0;
2657 //Grab the translation table from TargetAsmInfo if it exists
2660 const TargetMachineRegistry::Entry* Match =
2661 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2663 //Per platform Target Machines don't exist, so create it
2664 // this must be done only once
2665 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2666 TAsm = TM->getTargetAsmInfo();
2670 table = TAsm->getAsmCBE();
2672 //Search the translation table if it exists
2673 for (int i = 0; table && table[i]; i += 2)
2674 if (c.Codes[0] == table[i])
2677 //default is identity
2681 //TODO: import logic from AsmPrinter.cpp
2682 static std::string gccifyAsm(std::string asmstr) {
2683 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2684 if (asmstr[i] == '\n')
2685 asmstr.replace(i, 1, "\\n");
2686 else if (asmstr[i] == '\t')
2687 asmstr.replace(i, 1, "\\t");
2688 else if (asmstr[i] == '$') {
2689 if (asmstr[i + 1] == '{') {
2690 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2691 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2692 std::string n = "%" +
2693 asmstr.substr(a + 1, b - a - 1) +
2694 asmstr.substr(i + 2, a - i - 2);
2695 asmstr.replace(i, b - i + 1, n);
2698 asmstr.replace(i, 1, "%");
2700 else if (asmstr[i] == '%')//grr
2701 { asmstr.replace(i, 1, "%%"); ++i;}
2706 //TODO: assumptions about what consume arguments from the call are likely wrong
2707 // handle communitivity
2708 void CWriter::visitInlineAsm(CallInst &CI) {
2709 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2710 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2711 std::vector<std::pair<std::string, Value*> > Input;
2712 std::vector<std::pair<std::string, Value*> > Output;
2713 std::string Clobber;
2714 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2715 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2716 E = Constraints.end(); I != E; ++I) {
2717 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2719 InterpretASMConstraint(*I);
2722 assert(0 && "Unknown asm constraint");
2724 case InlineAsm::isInput: {
2726 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2727 ++count; //consume arg
2731 case InlineAsm::isOutput: {
2733 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2734 count ? CI.getOperand(count) : &CI));
2735 ++count; //consume arg
2739 case InlineAsm::isClobber: {
2741 Clobber += ",\"" + c + "\"";
2747 //fix up the asm string for gcc
2748 std::string asmstr = gccifyAsm(as->getAsmString());
2750 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2752 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2753 E = Output.end(); I != E; ++I) {
2754 Out << "\"" << I->first << "\"(";
2755 writeOperandRaw(I->second);
2761 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2762 E = Input.end(); I != E; ++I) {
2763 Out << "\"" << I->first << "\"(";
2764 writeOperandRaw(I->second);
2770 Out << "\n :" << Clobber.substr(1);
2774 void CWriter::visitMallocInst(MallocInst &I) {
2775 assert(0 && "lowerallocations pass didn't work!");
2778 void CWriter::visitAllocaInst(AllocaInst &I) {
2780 printType(Out, I.getType());
2781 Out << ") alloca(sizeof(";
2782 printType(Out, I.getType()->getElementType());
2784 if (I.isArrayAllocation()) {
2786 writeOperand(I.getOperand(0));
2791 void CWriter::visitFreeInst(FreeInst &I) {
2792 assert(0 && "lowerallocations pass didn't work!");
2795 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2796 gep_type_iterator E) {
2797 bool HasImplicitAddress = false;
2798 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2799 if (isa<GlobalValue>(Ptr)) {
2800 HasImplicitAddress = true;
2801 } else if (isDirectAlloca(Ptr)) {
2802 HasImplicitAddress = true;
2806 if (!HasImplicitAddress)
2807 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2809 writeOperandInternal(Ptr);
2813 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2814 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2817 writeOperandInternal(Ptr);
2819 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2821 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2824 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2825 "Can only have implicit address with direct accessing");
2827 if (HasImplicitAddress) {
2829 } else if (CI && CI->isNullValue()) {
2830 gep_type_iterator TmpI = I; ++TmpI;
2832 // Print out the -> operator if possible...
2833 if (TmpI != E && isa<StructType>(*TmpI)) {
2834 Out << (HasImplicitAddress ? "." : "->");
2835 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2841 if (isa<StructType>(*I)) {
2842 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2845 writeOperand(I.getOperand());
2850 void CWriter::visitLoadInst(LoadInst &I) {
2852 if (I.isVolatile()) {
2854 printType(Out, I.getType(), false, "volatile*");
2858 writeOperand(I.getOperand(0));
2864 void CWriter::visitStoreInst(StoreInst &I) {
2866 if (I.isVolatile()) {
2868 printType(Out, I.getOperand(0)->getType(), false, " volatile*");
2871 writeOperand(I.getPointerOperand());
2872 if (I.isVolatile()) Out << ')';
2874 Value *Operand = I.getOperand(0);
2875 Constant *BitMask = 0;
2876 if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
2877 if (!ITy->isPowerOf2ByteWidth())
2878 // We have a bit width that doesn't match an even power-of-2 byte
2879 // size. Consequently we must & the value with the type's bit mask
2880 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
2883 writeOperand(Operand);
2886 printConstant(BitMask);
2891 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2893 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2897 void CWriter::visitVAArgInst(VAArgInst &I) {
2898 Out << "va_arg(*(va_list*)";
2899 writeOperand(I.getOperand(0));
2901 printType(Out, I.getType());
2905 //===----------------------------------------------------------------------===//
2906 // External Interface declaration
2907 //===----------------------------------------------------------------------===//
2909 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2911 CodeGenFileType FileType,
2913 if (FileType != TargetMachine::AssemblyFile) return true;
2915 PM.add(createLowerGCPass());
2916 PM.add(createLowerAllocationsPass(true));
2917 PM.add(createLowerInvokePass());
2918 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2919 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2920 PM.add(new CWriter(o));