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/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/Analysis/ConstantsScanner.h"
28 #include "llvm/Analysis/FindUsedTypes.h"
29 #include "llvm/Analysis/LoopInfo.h"
30 #include "llvm/CodeGen/IntrinsicLowering.h"
31 #include "llvm/Transforms/Scalar.h"
32 #include "llvm/Target/TargetMachineRegistry.h"
33 #include "llvm/Target/TargetAsmInfo.h"
34 #include "llvm/Target/TargetData.h"
35 #include "llvm/Support/CallSite.h"
36 #include "llvm/Support/CFG.h"
37 #include "llvm/Support/GetElementPtrTypeIterator.h"
38 #include "llvm/Support/InstVisitor.h"
39 #include "llvm/Support/Mangler.h"
40 #include "llvm/Support/MathExtras.h"
41 #include "llvm/ADT/StringExtras.h"
42 #include "llvm/ADT/STLExtras.h"
43 #include "llvm/Support/MathExtras.h"
44 #include "llvm/Config/config.h"
50 // Register the target.
51 RegisterTarget<CTargetMachine> X("c", " C backend");
53 /// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
54 /// any unnamed structure types that are used by the program, and merges
55 /// external functions with the same name.
57 class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
58 void getAnalysisUsage(AnalysisUsage &AU) const {
59 AU.addRequired<FindUsedTypes>();
62 virtual const char *getPassName() const {
63 return "C backend type canonicalizer";
66 virtual bool runOnModule(Module &M);
69 /// CWriter - This class is the main chunk of code that converts an LLVM
70 /// module to a C translation unit.
71 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
73 IntrinsicLowering *IL;
76 const Module *TheModule;
77 const TargetAsmInfo* TAsm;
79 std::map<const Type *, std::string> TypeNames;
81 std::map<const ConstantFP *, unsigned> FPConstantMap;
83 CWriter(std::ostream &o) : Out(o), IL(0), Mang(0), LI(0), TheModule(0),
86 virtual const char *getPassName() const { return "C backend"; }
88 void getAnalysisUsage(AnalysisUsage &AU) const {
89 AU.addRequired<LoopInfo>();
93 virtual bool doInitialization(Module &M);
95 bool runOnFunction(Function &F) {
96 LI = &getAnalysis<LoopInfo>();
98 // Get rid of intrinsics we can't handle.
101 // Output all floating point constants that cannot be printed accurately.
102 printFloatingPointConstants(F);
105 FPConstantMap.clear();
109 virtual bool doFinalization(Module &M) {
116 std::ostream &printType(std::ostream &Out, const Type *Ty,
117 bool isSigned = false,
118 const std::string &VariableName = "",
119 bool IgnoreName = false);
120 std::ostream &printSimpleType(std::ostream &Out, const Type *Ty,
122 const std::string &NameSoFar = "");
124 void printStructReturnPointerFunctionType(std::ostream &Out,
125 const PointerType *Ty);
127 void writeOperand(Value *Operand);
128 void writeOperandRaw(Value *Operand);
129 void writeOperandInternal(Value *Operand);
130 void writeOperandWithCast(Value* Operand, unsigned Opcode);
131 void writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate);
132 bool writeInstructionCast(const Instruction &I);
135 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
137 void lowerIntrinsics(Function &F);
139 void printModule(Module *M);
140 void printModuleTypes(const TypeSymbolTable &ST);
141 void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
142 void printFloatingPointConstants(Function &F);
143 void printFunctionSignature(const Function *F, bool Prototype);
145 void printFunction(Function &);
146 void printBasicBlock(BasicBlock *BB);
147 void printLoop(Loop *L);
149 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
150 void printConstant(Constant *CPV);
151 void printConstantWithCast(Constant *CPV, unsigned Opcode);
152 bool printConstExprCast(const ConstantExpr *CE);
153 void printConstantArray(ConstantArray *CPA);
154 void printConstantVector(ConstantVector *CP);
156 // isInlinableInst - Attempt to inline instructions into their uses to build
157 // trees as much as possible. To do this, we have to consistently decide
158 // what is acceptable to inline, so that variable declarations don't get
159 // printed and an extra copy of the expr is not emitted.
161 static bool isInlinableInst(const Instruction &I) {
162 // Always inline cmp instructions, even if they are shared by multiple
163 // expressions. GCC generates horrible code if we don't.
167 // Must be an expression, must be used exactly once. If it is dead, we
168 // emit it inline where it would go.
169 if (I.getType() == Type::VoidTy || !I.hasOneUse() ||
170 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
171 isa<LoadInst>(I) || isa<VAArgInst>(I))
172 // Don't inline a load across a store or other bad things!
175 // Must not be used in inline asm
176 if (I.hasOneUse() && isInlineAsm(*I.use_back())) return false;
178 // Only inline instruction it if it's use is in the same BB as the inst.
179 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
182 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
183 // variables which are accessed with the & operator. This causes GCC to
184 // generate significantly better code than to emit alloca calls directly.
186 static const AllocaInst *isDirectAlloca(const Value *V) {
187 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
188 if (!AI) return false;
189 if (AI->isArrayAllocation())
190 return 0; // FIXME: we can also inline fixed size array allocas!
191 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
196 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
197 static bool isInlineAsm(const Instruction& I) {
198 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
203 // Instruction visitation functions
204 friend class InstVisitor<CWriter>;
206 void visitReturnInst(ReturnInst &I);
207 void visitBranchInst(BranchInst &I);
208 void visitSwitchInst(SwitchInst &I);
209 void visitInvokeInst(InvokeInst &I) {
210 assert(0 && "Lowerinvoke pass didn't work!");
213 void visitUnwindInst(UnwindInst &I) {
214 assert(0 && "Lowerinvoke pass didn't work!");
216 void visitUnreachableInst(UnreachableInst &I);
218 void visitPHINode(PHINode &I);
219 void visitBinaryOperator(Instruction &I);
220 void visitICmpInst(ICmpInst &I);
221 void visitFCmpInst(FCmpInst &I);
223 void visitCastInst (CastInst &I);
224 void visitSelectInst(SelectInst &I);
225 void visitCallInst (CallInst &I);
226 void visitInlineAsm(CallInst &I);
228 void visitMallocInst(MallocInst &I);
229 void visitAllocaInst(AllocaInst &I);
230 void visitFreeInst (FreeInst &I);
231 void visitLoadInst (LoadInst &I);
232 void visitStoreInst (StoreInst &I);
233 void visitGetElementPtrInst(GetElementPtrInst &I);
234 void visitVAArgInst (VAArgInst &I);
236 void visitInstruction(Instruction &I) {
237 cerr << "C Writer does not know about " << I;
241 void outputLValue(Instruction *I) {
242 Out << " " << GetValueName(I) << " = ";
245 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
246 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
247 BasicBlock *Successor, unsigned Indent);
248 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
250 void printIndexingExpression(Value *Ptr, gep_type_iterator I,
251 gep_type_iterator E);
253 std::string GetValueName(const Value *Operand);
257 /// This method inserts names for any unnamed structure types that are used by
258 /// the program, and removes names from structure types that are not used by the
261 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
262 // Get a set of types that are used by the program...
263 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
265 // Loop over the module symbol table, removing types from UT that are
266 // already named, and removing names for types that are not used.
268 TypeSymbolTable &TST = M.getTypeSymbolTable();
269 for (TypeSymbolTable::iterator TI = TST.begin(), TE = TST.end();
271 TypeSymbolTable::iterator I = TI++;
273 // If this isn't a struct type, remove it from our set of types to name.
274 // This simplifies emission later.
275 if (!isa<StructType>(I->second) && !isa<OpaqueType>(I->second)) {
278 // If this is not used, remove it from the symbol table.
279 std::set<const Type *>::iterator UTI = UT.find(I->second);
283 UT.erase(UTI); // Only keep one name for this type.
287 // UT now contains types that are not named. Loop over it, naming
290 bool Changed = false;
291 unsigned RenameCounter = 0;
292 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
294 if (const StructType *ST = dyn_cast<StructType>(*I)) {
295 while (M.addTypeName("unnamed"+utostr(RenameCounter), ST))
301 // Loop over all external functions and globals. If we have two with
302 // identical names, merge them.
303 // FIXME: This code should disappear when we don't allow values with the same
304 // names when they have different types!
305 std::map<std::string, GlobalValue*> ExtSymbols;
306 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
308 if (GV->isDeclaration() && GV->hasName()) {
309 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
310 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
312 // Found a conflict, replace this global with the previous one.
313 GlobalValue *OldGV = X.first->second;
314 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
315 GV->eraseFromParent();
320 // Do the same for globals.
321 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
323 GlobalVariable *GV = I++;
324 if (GV->isDeclaration() && GV->hasName()) {
325 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
326 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
328 // Found a conflict, replace this global with the previous one.
329 GlobalValue *OldGV = X.first->second;
330 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
331 GV->eraseFromParent();
340 /// printStructReturnPointerFunctionType - This is like printType for a struct
341 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
342 /// print it as "Struct (*)(...)", for struct return functions.
343 void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
344 const PointerType *TheTy) {
345 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
346 std::stringstream FunctionInnards;
347 FunctionInnards << " (*) (";
348 bool PrintedType = false;
350 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
351 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
353 for (++I; I != E; ++I) {
355 FunctionInnards << ", ";
356 printType(FunctionInnards, *I,
357 /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute), "");
360 if (FTy->isVarArg()) {
362 FunctionInnards << ", ...";
363 } else if (!PrintedType) {
364 FunctionInnards << "void";
366 FunctionInnards << ')';
367 std::string tstr = FunctionInnards.str();
368 printType(Out, RetTy,
369 /*isSigned=*/FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
373 CWriter::printSimpleType(std::ostream &Out, const Type *Ty, bool isSigned,
374 const std::string &NameSoFar) {
375 assert((Ty->isPrimitiveType() || Ty->isInteger()) &&
376 "Invalid type for printSimpleType");
377 switch (Ty->getTypeID()) {
378 case Type::VoidTyID: return Out << "void " << NameSoFar;
379 case Type::IntegerTyID: {
380 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
382 return Out << "bool " << NameSoFar;
383 else if (NumBits <= 8)
384 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
385 else if (NumBits <= 16)
386 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
387 else if (NumBits <= 32)
388 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
390 assert(NumBits <= 64 && "Bit widths > 64 not implemented yet");
391 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
394 case Type::FloatTyID: return Out << "float " << NameSoFar;
395 case Type::DoubleTyID: return Out << "double " << NameSoFar;
397 cerr << "Unknown primitive type: " << *Ty << "\n";
402 // Pass the Type* and the variable name and this prints out the variable
405 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
406 bool isSigned, const std::string &NameSoFar,
408 if (Ty->isPrimitiveType() || Ty->isInteger()) {
409 printSimpleType(Out, Ty, isSigned, NameSoFar);
413 // Check to see if the type is named.
414 if (!IgnoreName || isa<OpaqueType>(Ty)) {
415 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
416 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
419 switch (Ty->getTypeID()) {
420 case Type::FunctionTyID: {
421 const FunctionType *FTy = cast<FunctionType>(Ty);
422 std::stringstream FunctionInnards;
423 FunctionInnards << " (" << NameSoFar << ") (";
425 for (FunctionType::param_iterator I = FTy->param_begin(),
426 E = FTy->param_end(); I != E; ++I) {
427 if (I != FTy->param_begin())
428 FunctionInnards << ", ";
429 printType(FunctionInnards, *I,
430 /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute), "");
433 if (FTy->isVarArg()) {
434 if (FTy->getNumParams())
435 FunctionInnards << ", ...";
436 } else if (!FTy->getNumParams()) {
437 FunctionInnards << "void";
439 FunctionInnards << ')';
440 std::string tstr = FunctionInnards.str();
441 printType(Out, FTy->getReturnType(),
442 /*isSigned=*/FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
445 case Type::StructTyID: {
446 const StructType *STy = cast<StructType>(Ty);
447 Out << NameSoFar + " {\n";
449 for (StructType::element_iterator I = STy->element_begin(),
450 E = STy->element_end(); I != E; ++I) {
452 printType(Out, *I, false, "field" + utostr(Idx++));
458 case Type::PointerTyID: {
459 const PointerType *PTy = cast<PointerType>(Ty);
460 std::string ptrName = "*" + NameSoFar;
462 if (isa<ArrayType>(PTy->getElementType()) ||
463 isa<VectorType>(PTy->getElementType()))
464 ptrName = "(" + ptrName + ")";
466 return printType(Out, PTy->getElementType(), false, ptrName);
469 case Type::ArrayTyID: {
470 const ArrayType *ATy = cast<ArrayType>(Ty);
471 unsigned NumElements = ATy->getNumElements();
472 if (NumElements == 0) NumElements = 1;
473 return printType(Out, ATy->getElementType(), false,
474 NameSoFar + "[" + utostr(NumElements) + "]");
477 case Type::VectorTyID: {
478 const VectorType *PTy = cast<VectorType>(Ty);
479 unsigned NumElements = PTy->getNumElements();
480 if (NumElements == 0) NumElements = 1;
481 return printType(Out, PTy->getElementType(), false,
482 NameSoFar + "[" + utostr(NumElements) + "]");
485 case Type::OpaqueTyID: {
486 static int Count = 0;
487 std::string TyName = "struct opaque_" + itostr(Count++);
488 assert(TypeNames.find(Ty) == TypeNames.end());
489 TypeNames[Ty] = TyName;
490 return Out << TyName << ' ' << NameSoFar;
493 assert(0 && "Unhandled case in getTypeProps!");
500 void CWriter::printConstantArray(ConstantArray *CPA) {
502 // As a special case, print the array as a string if it is an array of
503 // ubytes or an array of sbytes with positive values.
505 const Type *ETy = CPA->getType()->getElementType();
506 bool isString = (ETy == Type::Int8Ty || ETy == Type::Int8Ty);
508 // Make sure the last character is a null char, as automatically added by C
509 if (isString && (CPA->getNumOperands() == 0 ||
510 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
515 // Keep track of whether the last number was a hexadecimal escape
516 bool LastWasHex = false;
518 // Do not include the last character, which we know is null
519 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
520 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
522 // Print it out literally if it is a printable character. The only thing
523 // to be careful about is when the last letter output was a hex escape
524 // code, in which case we have to be careful not to print out hex digits
525 // explicitly (the C compiler thinks it is a continuation of the previous
526 // character, sheesh...)
528 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
530 if (C == '"' || C == '\\')
537 case '\n': Out << "\\n"; break;
538 case '\t': Out << "\\t"; break;
539 case '\r': Out << "\\r"; break;
540 case '\v': Out << "\\v"; break;
541 case '\a': Out << "\\a"; break;
542 case '\"': Out << "\\\""; break;
543 case '\'': Out << "\\\'"; break;
546 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
547 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
556 if (CPA->getNumOperands()) {
558 printConstant(cast<Constant>(CPA->getOperand(0)));
559 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
561 printConstant(cast<Constant>(CPA->getOperand(i)));
568 void CWriter::printConstantVector(ConstantVector *CP) {
570 if (CP->getNumOperands()) {
572 printConstant(cast<Constant>(CP->getOperand(0)));
573 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
575 printConstant(cast<Constant>(CP->getOperand(i)));
581 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
582 // textually as a double (rather than as a reference to a stack-allocated
583 // variable). We decide this by converting CFP to a string and back into a
584 // double, and then checking whether the conversion results in a bit-equal
585 // double to the original value of CFP. This depends on us and the target C
586 // compiler agreeing on the conversion process (which is pretty likely since we
587 // only deal in IEEE FP).
589 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
590 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
592 sprintf(Buffer, "%a", CFP->getValue());
594 if (!strncmp(Buffer, "0x", 2) ||
595 !strncmp(Buffer, "-0x", 3) ||
596 !strncmp(Buffer, "+0x", 3))
597 return atof(Buffer) == CFP->getValue();
600 std::string StrVal = ftostr(CFP->getValue());
602 while (StrVal[0] == ' ')
603 StrVal.erase(StrVal.begin());
605 // Check to make sure that the stringized number is not some string like "Inf"
606 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
607 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
608 ((StrVal[0] == '-' || StrVal[0] == '+') &&
609 (StrVal[1] >= '0' && StrVal[1] <= '9')))
610 // Reparse stringized version!
611 return atof(StrVal.c_str()) == CFP->getValue();
616 /// Print out the casting for a cast operation. This does the double casting
617 /// necessary for conversion to the destination type, if necessary.
618 /// @brief Print a cast
619 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
620 // Print the destination type cast
622 case Instruction::UIToFP:
623 case Instruction::SIToFP:
624 case Instruction::IntToPtr:
625 case Instruction::Trunc:
626 case Instruction::BitCast:
627 case Instruction::FPExt:
628 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
630 printType(Out, DstTy);
633 case Instruction::ZExt:
634 case Instruction::PtrToInt:
635 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
637 printSimpleType(Out, DstTy, false);
640 case Instruction::SExt:
641 case Instruction::FPToSI: // For these, make sure we get a signed dest
643 printSimpleType(Out, DstTy, true);
647 assert(0 && "Invalid cast opcode");
650 // Print the source type cast
652 case Instruction::UIToFP:
653 case Instruction::ZExt:
655 printSimpleType(Out, SrcTy, false);
658 case Instruction::SIToFP:
659 case Instruction::SExt:
661 printSimpleType(Out, SrcTy, true);
664 case Instruction::IntToPtr:
665 case Instruction::PtrToInt:
666 // Avoid "cast to pointer from integer of different size" warnings
667 Out << "(unsigned long)";
669 case Instruction::Trunc:
670 case Instruction::BitCast:
671 case Instruction::FPExt:
672 case Instruction::FPTrunc:
673 case Instruction::FPToSI:
674 case Instruction::FPToUI:
675 break; // These don't need a source cast.
677 assert(0 && "Invalid cast opcode");
682 // printConstant - The LLVM Constant to C Constant converter.
683 void CWriter::printConstant(Constant *CPV) {
684 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
685 switch (CE->getOpcode()) {
686 case Instruction::Trunc:
687 case Instruction::ZExt:
688 case Instruction::SExt:
689 case Instruction::FPTrunc:
690 case Instruction::FPExt:
691 case Instruction::UIToFP:
692 case Instruction::SIToFP:
693 case Instruction::FPToUI:
694 case Instruction::FPToSI:
695 case Instruction::PtrToInt:
696 case Instruction::IntToPtr:
697 case Instruction::BitCast:
699 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
700 if (CE->getOpcode() == Instruction::SExt &&
701 CE->getOperand(0)->getType() == Type::Int1Ty) {
702 // Make sure we really sext from bool here by subtracting from 0
705 printConstant(CE->getOperand(0));
706 if (CE->getType() == Type::Int1Ty &&
707 (CE->getOpcode() == Instruction::Trunc ||
708 CE->getOpcode() == Instruction::FPToUI ||
709 CE->getOpcode() == Instruction::FPToSI ||
710 CE->getOpcode() == Instruction::PtrToInt)) {
711 // Make sure we really truncate to bool here by anding with 1
717 case Instruction::GetElementPtr:
719 printIndexingExpression(CE->getOperand(0), gep_type_begin(CPV),
723 case Instruction::Select:
725 printConstant(CE->getOperand(0));
727 printConstant(CE->getOperand(1));
729 printConstant(CE->getOperand(2));
732 case Instruction::Add:
733 case Instruction::Sub:
734 case Instruction::Mul:
735 case Instruction::SDiv:
736 case Instruction::UDiv:
737 case Instruction::FDiv:
738 case Instruction::URem:
739 case Instruction::SRem:
740 case Instruction::FRem:
741 case Instruction::And:
742 case Instruction::Or:
743 case Instruction::Xor:
744 case Instruction::ICmp:
745 case Instruction::Shl:
746 case Instruction::LShr:
747 case Instruction::AShr:
750 bool NeedsClosingParens = printConstExprCast(CE);
751 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
752 switch (CE->getOpcode()) {
753 case Instruction::Add: Out << " + "; break;
754 case Instruction::Sub: Out << " - "; break;
755 case Instruction::Mul: Out << " * "; break;
756 case Instruction::URem:
757 case Instruction::SRem:
758 case Instruction::FRem: Out << " % "; break;
759 case Instruction::UDiv:
760 case Instruction::SDiv:
761 case Instruction::FDiv: Out << " / "; break;
762 case Instruction::And: Out << " & "; break;
763 case Instruction::Or: Out << " | "; break;
764 case Instruction::Xor: Out << " ^ "; break;
765 case Instruction::Shl: Out << " << "; break;
766 case Instruction::LShr:
767 case Instruction::AShr: Out << " >> "; break;
768 case Instruction::ICmp:
769 switch (CE->getPredicate()) {
770 case ICmpInst::ICMP_EQ: Out << " == "; break;
771 case ICmpInst::ICMP_NE: Out << " != "; break;
772 case ICmpInst::ICMP_SLT:
773 case ICmpInst::ICMP_ULT: Out << " < "; break;
774 case ICmpInst::ICMP_SLE:
775 case ICmpInst::ICMP_ULE: Out << " <= "; break;
776 case ICmpInst::ICMP_SGT:
777 case ICmpInst::ICMP_UGT: Out << " > "; break;
778 case ICmpInst::ICMP_SGE:
779 case ICmpInst::ICMP_UGE: Out << " >= "; break;
780 default: assert(0 && "Illegal ICmp predicate");
783 default: assert(0 && "Illegal opcode here!");
785 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
786 if (NeedsClosingParens)
791 case Instruction::FCmp: {
793 bool NeedsClosingParens = printConstExprCast(CE);
794 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
796 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
800 switch (CE->getPredicate()) {
801 default: assert(0 && "Illegal FCmp predicate");
802 case FCmpInst::FCMP_ORD: op = "ord"; break;
803 case FCmpInst::FCMP_UNO: op = "uno"; break;
804 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
805 case FCmpInst::FCMP_UNE: op = "une"; break;
806 case FCmpInst::FCMP_ULT: op = "ult"; break;
807 case FCmpInst::FCMP_ULE: op = "ule"; break;
808 case FCmpInst::FCMP_UGT: op = "ugt"; break;
809 case FCmpInst::FCMP_UGE: op = "uge"; break;
810 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
811 case FCmpInst::FCMP_ONE: op = "one"; break;
812 case FCmpInst::FCMP_OLT: op = "olt"; break;
813 case FCmpInst::FCMP_OLE: op = "ole"; break;
814 case FCmpInst::FCMP_OGT: op = "ogt"; break;
815 case FCmpInst::FCMP_OGE: op = "oge"; break;
817 Out << "llvm_fcmp_" << op << "(";
818 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
820 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
823 if (NeedsClosingParens)
828 cerr << "CWriter Error: Unhandled constant expression: "
832 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
834 printType(Out, CPV->getType()); // sign doesn't matter
835 Out << ")/*UNDEF*/0)";
839 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
840 const Type* Ty = CI->getType();
841 if (Ty == Type::Int1Ty)
842 Out << (CI->getZExtValue() ? '1' : '0') ;
845 printSimpleType(Out, Ty, false) << ')';
846 if (CI->isMinValue(true))
847 Out << CI->getZExtValue() << 'u';
849 Out << CI->getSExtValue();
850 if (Ty->getPrimitiveSizeInBits() > 32)
857 switch (CPV->getType()->getTypeID()) {
858 case Type::FloatTyID:
859 case Type::DoubleTyID: {
860 ConstantFP *FPC = cast<ConstantFP>(CPV);
861 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
862 if (I != FPConstantMap.end()) {
863 // Because of FP precision problems we must load from a stack allocated
864 // value that holds the value in hex.
865 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
866 << "*)&FPConstant" << I->second << ')';
868 if (IsNAN(FPC->getValue())) {
871 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
873 const unsigned long QuietNaN = 0x7ff8UL;
874 //const unsigned long SignalNaN = 0x7ff4UL;
876 // We need to grab the first part of the FP #
879 uint64_t ll = DoubleToBits(FPC->getValue());
880 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
882 std::string Num(&Buffer[0], &Buffer[6]);
883 unsigned long Val = strtoul(Num.c_str(), 0, 16);
885 if (FPC->getType() == Type::FloatTy)
886 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
887 << Buffer << "\") /*nan*/ ";
889 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
890 << Buffer << "\") /*nan*/ ";
891 } else if (IsInf(FPC->getValue())) {
893 if (FPC->getValue() < 0) Out << '-';
894 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
898 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
899 // Print out the constant as a floating point number.
901 sprintf(Buffer, "%a", FPC->getValue());
904 Num = ftostr(FPC->getValue());
912 case Type::ArrayTyID:
913 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
914 const ArrayType *AT = cast<ArrayType>(CPV->getType());
916 if (AT->getNumElements()) {
918 Constant *CZ = Constant::getNullValue(AT->getElementType());
920 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
927 printConstantArray(cast<ConstantArray>(CPV));
931 case Type::VectorTyID:
932 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
933 const VectorType *AT = cast<VectorType>(CPV->getType());
935 if (AT->getNumElements()) {
937 Constant *CZ = Constant::getNullValue(AT->getElementType());
939 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
946 printConstantVector(cast<ConstantVector>(CPV));
950 case Type::StructTyID:
951 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
952 const StructType *ST = cast<StructType>(CPV->getType());
954 if (ST->getNumElements()) {
956 printConstant(Constant::getNullValue(ST->getElementType(0)));
957 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
959 printConstant(Constant::getNullValue(ST->getElementType(i)));
965 if (CPV->getNumOperands()) {
967 printConstant(cast<Constant>(CPV->getOperand(0)));
968 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
970 printConstant(cast<Constant>(CPV->getOperand(i)));
977 case Type::PointerTyID:
978 if (isa<ConstantPointerNull>(CPV)) {
980 printType(Out, CPV->getType()); // sign doesn't matter
981 Out << ")/*NULL*/0)";
983 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
989 cerr << "Unknown constant type: " << *CPV << "\n";
994 // Some constant expressions need to be casted back to the original types
995 // because their operands were casted to the expected type. This function takes
996 // care of detecting that case and printing the cast for the ConstantExpr.
997 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
998 bool NeedsExplicitCast = false;
999 const Type *Ty = CE->getOperand(0)->getType();
1000 bool TypeIsSigned = false;
1001 switch (CE->getOpcode()) {
1002 case Instruction::LShr:
1003 case Instruction::URem:
1004 case Instruction::UDiv: NeedsExplicitCast = true; break;
1005 case Instruction::AShr:
1006 case Instruction::SRem:
1007 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1008 case Instruction::SExt:
1010 NeedsExplicitCast = true;
1011 TypeIsSigned = true;
1013 case Instruction::ZExt:
1014 case Instruction::Trunc:
1015 case Instruction::FPTrunc:
1016 case Instruction::FPExt:
1017 case Instruction::UIToFP:
1018 case Instruction::SIToFP:
1019 case Instruction::FPToUI:
1020 case Instruction::FPToSI:
1021 case Instruction::PtrToInt:
1022 case Instruction::IntToPtr:
1023 case Instruction::BitCast:
1025 NeedsExplicitCast = true;
1029 if (NeedsExplicitCast) {
1031 if (Ty->isInteger() && Ty != Type::Int1Ty)
1032 printSimpleType(Out, Ty, TypeIsSigned);
1034 printType(Out, Ty); // not integer, sign doesn't matter
1037 return NeedsExplicitCast;
1040 // Print a constant assuming that it is the operand for a given Opcode. The
1041 // opcodes that care about sign need to cast their operands to the expected
1042 // type before the operation proceeds. This function does the casting.
1043 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1045 // Extract the operand's type, we'll need it.
1046 const Type* OpTy = CPV->getType();
1048 // Indicate whether to do the cast or not.
1049 bool shouldCast = false;
1050 bool typeIsSigned = false;
1052 // Based on the Opcode for which this Constant is being written, determine
1053 // the new type to which the operand should be casted by setting the value
1054 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1058 // for most instructions, it doesn't matter
1060 case Instruction::LShr:
1061 case Instruction::UDiv:
1062 case Instruction::URem:
1065 case Instruction::AShr:
1066 case Instruction::SDiv:
1067 case Instruction::SRem:
1069 typeIsSigned = true;
1073 // Write out the casted constant if we should, otherwise just write the
1077 printSimpleType(Out, OpTy, typeIsSigned);
1085 std::string CWriter::GetValueName(const Value *Operand) {
1088 if (!isa<GlobalValue>(Operand) && Operand->getName() != "") {
1089 std::string VarName;
1091 Name = Operand->getName();
1092 VarName.reserve(Name.capacity());
1094 for (std::string::iterator I = Name.begin(), E = Name.end();
1098 if (!((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
1099 (ch >= '0' && ch <= '9') || ch == '_'))
1105 Name = "llvm_cbe_" + VarName;
1107 Name = Mang->getValueName(Operand);
1113 void CWriter::writeOperandInternal(Value *Operand) {
1114 if (Instruction *I = dyn_cast<Instruction>(Operand))
1115 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1116 // Should we inline this instruction to build a tree?
1123 Constant* CPV = dyn_cast<Constant>(Operand);
1125 if (CPV && !isa<GlobalValue>(CPV))
1128 Out << GetValueName(Operand);
1131 void CWriter::writeOperandRaw(Value *Operand) {
1132 Constant* CPV = dyn_cast<Constant>(Operand);
1133 if (CPV && !isa<GlobalValue>(CPV)) {
1136 Out << GetValueName(Operand);
1140 void CWriter::writeOperand(Value *Operand) {
1141 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1142 Out << "(&"; // Global variables are referenced as their addresses by llvm
1144 writeOperandInternal(Operand);
1146 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1150 // Some instructions need to have their result value casted back to the
1151 // original types because their operands were casted to the expected type.
1152 // This function takes care of detecting that case and printing the cast
1153 // for the Instruction.
1154 bool CWriter::writeInstructionCast(const Instruction &I) {
1155 const Type *Ty = I.getOperand(0)->getType();
1156 switch (I.getOpcode()) {
1157 case Instruction::LShr:
1158 case Instruction::URem:
1159 case Instruction::UDiv:
1161 printSimpleType(Out, Ty, false);
1164 case Instruction::AShr:
1165 case Instruction::SRem:
1166 case Instruction::SDiv:
1168 printSimpleType(Out, Ty, true);
1176 // Write the operand with a cast to another type based on the Opcode being used.
1177 // This will be used in cases where an instruction has specific type
1178 // requirements (usually signedness) for its operands.
1179 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1181 // Extract the operand's type, we'll need it.
1182 const Type* OpTy = Operand->getType();
1184 // Indicate whether to do the cast or not.
1185 bool shouldCast = false;
1187 // Indicate whether the cast should be to a signed type or not.
1188 bool castIsSigned = false;
1190 // Based on the Opcode for which this Operand is being written, determine
1191 // the new type to which the operand should be casted by setting the value
1192 // of OpTy. If we change OpTy, also set shouldCast to true.
1195 // for most instructions, it doesn't matter
1197 case Instruction::LShr:
1198 case Instruction::UDiv:
1199 case Instruction::URem: // Cast to unsigned first
1201 castIsSigned = false;
1203 case Instruction::AShr:
1204 case Instruction::SDiv:
1205 case Instruction::SRem: // Cast to signed first
1207 castIsSigned = true;
1211 // Write out the casted operand if we should, otherwise just write the
1215 printSimpleType(Out, OpTy, castIsSigned);
1217 writeOperand(Operand);
1220 writeOperand(Operand);
1223 // Write the operand with a cast to another type based on the icmp predicate
1225 void CWriter::writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate) {
1227 // Extract the operand's type, we'll need it.
1228 const Type* OpTy = Operand->getType();
1230 // Indicate whether to do the cast or not.
1231 bool shouldCast = false;
1233 // Indicate whether the cast should be to a signed type or not.
1234 bool castIsSigned = false;
1236 // Based on the Opcode for which this Operand is being written, determine
1237 // the new type to which the operand should be casted by setting the value
1238 // of OpTy. If we change OpTy, also set shouldCast to true.
1239 switch (predicate) {
1241 // for eq and ne, it doesn't matter
1243 case ICmpInst::ICMP_UGT:
1244 case ICmpInst::ICMP_UGE:
1245 case ICmpInst::ICMP_ULT:
1246 case ICmpInst::ICMP_ULE:
1249 case ICmpInst::ICMP_SGT:
1250 case ICmpInst::ICMP_SGE:
1251 case ICmpInst::ICMP_SLT:
1252 case ICmpInst::ICMP_SLE:
1254 castIsSigned = true;
1258 // Write out the casted operand if we should, otherwise just write the
1262 if (OpTy->isInteger() && OpTy != Type::Int1Ty)
1263 printSimpleType(Out, OpTy, castIsSigned);
1265 printType(Out, OpTy); // not integer, sign doesn't matter
1267 writeOperand(Operand);
1270 writeOperand(Operand);
1273 // generateCompilerSpecificCode - This is where we add conditional compilation
1274 // directives to cater to specific compilers as need be.
1276 static void generateCompilerSpecificCode(std::ostream& Out) {
1277 // Alloca is hard to get, and we don't want to include stdlib.h here.
1278 Out << "/* get a declaration for alloca */\n"
1279 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1280 << "extern void *_alloca(unsigned long);\n"
1281 << "#define alloca(x) _alloca(x)\n"
1282 << "#elif defined(__APPLE__)\n"
1283 << "extern void *__builtin_alloca(unsigned long);\n"
1284 << "#define alloca(x) __builtin_alloca(x)\n"
1285 << "#define longjmp _longjmp\n"
1286 << "#define setjmp _setjmp\n"
1287 << "#elif defined(__sun__)\n"
1288 << "#if defined(__sparcv9)\n"
1289 << "extern void *__builtin_alloca(unsigned long);\n"
1291 << "extern void *__builtin_alloca(unsigned int);\n"
1293 << "#define alloca(x) __builtin_alloca(x)\n"
1294 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1295 << "#define alloca(x) __builtin_alloca(x)\n"
1296 << "#elif !defined(_MSC_VER)\n"
1297 << "#include <alloca.h>\n"
1300 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1301 // If we aren't being compiled with GCC, just drop these attributes.
1302 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1303 << "#define __attribute__(X)\n"
1306 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1307 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1308 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1309 << "#elif defined(__GNUC__)\n"
1310 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1312 << "#define __EXTERNAL_WEAK__\n"
1315 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1316 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1317 << "#define __ATTRIBUTE_WEAK__\n"
1318 << "#elif defined(__GNUC__)\n"
1319 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1321 << "#define __ATTRIBUTE_WEAK__\n"
1324 // Add hidden visibility support. FIXME: APPLE_CC?
1325 Out << "#if defined(__GNUC__)\n"
1326 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1329 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1330 // From the GCC documentation:
1332 // double __builtin_nan (const char *str)
1334 // This is an implementation of the ISO C99 function nan.
1336 // Since ISO C99 defines this function in terms of strtod, which we do
1337 // not implement, a description of the parsing is in order. The string is
1338 // parsed as by strtol; that is, the base is recognized by leading 0 or
1339 // 0x prefixes. The number parsed is placed in the significand such that
1340 // the least significant bit of the number is at the least significant
1341 // bit of the significand. The number is truncated to fit the significand
1342 // field provided. The significand is forced to be a quiet NaN.
1344 // This function, if given a string literal, is evaluated early enough
1345 // that it is considered a compile-time constant.
1347 // float __builtin_nanf (const char *str)
1349 // Similar to __builtin_nan, except the return type is float.
1351 // double __builtin_inf (void)
1353 // Similar to __builtin_huge_val, except a warning is generated if the
1354 // target floating-point format does not support infinities. This
1355 // function is suitable for implementing the ISO C99 macro INFINITY.
1357 // float __builtin_inff (void)
1359 // Similar to __builtin_inf, except the return type is float.
1360 Out << "#ifdef __GNUC__\n"
1361 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1362 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1363 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1364 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1365 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1366 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1367 << "#define LLVM_PREFETCH(addr,rw,locality) "
1368 "__builtin_prefetch(addr,rw,locality)\n"
1369 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1370 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1371 << "#define LLVM_ASM __asm__\n"
1373 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1374 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1375 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1376 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1377 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1378 << "#define LLVM_INFF 0.0F /* Float */\n"
1379 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1380 << "#define __ATTRIBUTE_CTOR__\n"
1381 << "#define __ATTRIBUTE_DTOR__\n"
1382 << "#define LLVM_ASM(X)\n"
1385 // Output target-specific code that should be inserted into main.
1386 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1387 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1388 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1389 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1390 << "defined(__x86_64__)\n"
1391 << "#undef CODE_FOR_MAIN\n"
1392 << "#define CODE_FOR_MAIN() \\\n"
1393 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1394 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1395 << "#endif\n#endif\n";
1399 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1400 /// the StaticTors set.
1401 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1402 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1403 if (!InitList) return;
1405 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1406 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1407 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1409 if (CS->getOperand(1)->isNullValue())
1410 return; // Found a null terminator, exit printing.
1411 Constant *FP = CS->getOperand(1);
1412 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1414 FP = CE->getOperand(0);
1415 if (Function *F = dyn_cast<Function>(FP))
1416 StaticTors.insert(F);
1420 enum SpecialGlobalClass {
1422 GlobalCtors, GlobalDtors,
1426 /// getGlobalVariableClass - If this is a global that is specially recognized
1427 /// by LLVM, return a code that indicates how we should handle it.
1428 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1429 // If this is a global ctors/dtors list, handle it now.
1430 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1431 if (GV->getName() == "llvm.global_ctors")
1433 else if (GV->getName() == "llvm.global_dtors")
1437 // Otherwise, it it is other metadata, don't print it. This catches things
1438 // like debug information.
1439 if (GV->getSection() == "llvm.metadata")
1446 bool CWriter::doInitialization(Module &M) {
1450 TD = new TargetData(&M);
1451 IL = new IntrinsicLowering(*TD);
1452 IL->AddPrototypes(M);
1454 // Ensure that all structure types have names...
1455 Mang = new Mangler(M);
1456 Mang->markCharUnacceptable('.');
1458 // Keep track of which functions are static ctors/dtors so they can have
1459 // an attribute added to their prototypes.
1460 std::set<Function*> StaticCtors, StaticDtors;
1461 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1463 switch (getGlobalVariableClass(I)) {
1466 FindStaticTors(I, StaticCtors);
1469 FindStaticTors(I, StaticDtors);
1474 // get declaration for alloca
1475 Out << "/* Provide Declarations */\n";
1476 Out << "#include <stdarg.h>\n"; // Varargs support
1477 Out << "#include <setjmp.h>\n"; // Unwind support
1478 generateCompilerSpecificCode(Out);
1480 // Provide a definition for `bool' if not compiling with a C++ compiler.
1482 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1484 << "\n\n/* Support for floating point constants */\n"
1485 << "typedef unsigned long long ConstantDoubleTy;\n"
1486 << "typedef unsigned int ConstantFloatTy;\n"
1488 << "\n\n/* Global Declarations */\n";
1490 // First output all the declarations for the program, because C requires
1491 // Functions & globals to be declared before they are used.
1494 // Loop over the symbol table, emitting all named constants...
1495 printModuleTypes(M.getTypeSymbolTable());
1497 // Global variable declarations...
1498 if (!M.global_empty()) {
1499 Out << "\n/* External Global Variable Declarations */\n";
1500 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1502 if (I->hasExternalLinkage()) {
1504 printType(Out, I->getType()->getElementType(), false,
1507 } else if (I->hasDLLImportLinkage()) {
1508 Out << "__declspec(dllimport) ";
1509 printType(Out, I->getType()->getElementType(), false,
1512 } else if (I->hasExternalWeakLinkage()) {
1514 printType(Out, I->getType()->getElementType(), false,
1516 Out << " __EXTERNAL_WEAK__ ;\n";
1521 // Function declarations
1522 Out << "\n/* Function Declarations */\n";
1523 Out << "double fmod(double, double);\n"; // Support for FP rem
1524 Out << "float fmodf(float, float);\n";
1526 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1527 // Don't print declarations for intrinsic functions.
1528 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1529 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1530 if (I->hasExternalWeakLinkage())
1532 printFunctionSignature(I, true);
1533 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1534 Out << " __ATTRIBUTE_WEAK__";
1535 if (I->hasExternalWeakLinkage())
1536 Out << " __EXTERNAL_WEAK__";
1537 if (StaticCtors.count(I))
1538 Out << " __ATTRIBUTE_CTOR__";
1539 if (StaticDtors.count(I))
1540 Out << " __ATTRIBUTE_DTOR__";
1541 if (I->hasHiddenVisibility())
1542 Out << " __HIDDEN__";
1544 if (I->hasName() && I->getName()[0] == 1)
1545 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1551 // Output the global variable declarations
1552 if (!M.global_empty()) {
1553 Out << "\n\n/* Global Variable Declarations */\n";
1554 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1556 if (!I->isDeclaration()) {
1557 // Ignore special globals, such as debug info.
1558 if (getGlobalVariableClass(I))
1561 if (I->hasInternalLinkage())
1565 printType(Out, I->getType()->getElementType(), false,
1568 if (I->hasLinkOnceLinkage())
1569 Out << " __attribute__((common))";
1570 else if (I->hasWeakLinkage())
1571 Out << " __ATTRIBUTE_WEAK__";
1572 else if (I->hasExternalWeakLinkage())
1573 Out << " __EXTERNAL_WEAK__";
1574 if (I->hasHiddenVisibility())
1575 Out << " __HIDDEN__";
1580 // Output the global variable definitions and contents...
1581 if (!M.global_empty()) {
1582 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1583 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1585 if (!I->isDeclaration()) {
1586 // Ignore special globals, such as debug info.
1587 if (getGlobalVariableClass(I))
1590 if (I->hasInternalLinkage())
1592 else if (I->hasDLLImportLinkage())
1593 Out << "__declspec(dllimport) ";
1594 else if (I->hasDLLExportLinkage())
1595 Out << "__declspec(dllexport) ";
1597 printType(Out, I->getType()->getElementType(), false,
1599 if (I->hasLinkOnceLinkage())
1600 Out << " __attribute__((common))";
1601 else if (I->hasWeakLinkage())
1602 Out << " __ATTRIBUTE_WEAK__";
1604 if (I->hasHiddenVisibility())
1605 Out << " __HIDDEN__";
1607 // If the initializer is not null, emit the initializer. If it is null,
1608 // we try to avoid emitting large amounts of zeros. The problem with
1609 // this, however, occurs when the variable has weak linkage. In this
1610 // case, the assembler will complain about the variable being both weak
1611 // and common, so we disable this optimization.
1612 if (!I->getInitializer()->isNullValue()) {
1614 writeOperand(I->getInitializer());
1615 } else if (I->hasWeakLinkage()) {
1616 // We have to specify an initializer, but it doesn't have to be
1617 // complete. If the value is an aggregate, print out { 0 }, and let
1618 // the compiler figure out the rest of the zeros.
1620 if (isa<StructType>(I->getInitializer()->getType()) ||
1621 isa<ArrayType>(I->getInitializer()->getType()) ||
1622 isa<VectorType>(I->getInitializer()->getType())) {
1625 // Just print it out normally.
1626 writeOperand(I->getInitializer());
1634 Out << "\n\n/* Function Bodies */\n";
1636 // Emit some helper functions for dealing with FCMP instruction's
1638 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1639 Out << "return X == X && Y == Y; }\n";
1640 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1641 Out << "return X != X || Y != Y; }\n";
1642 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1643 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1644 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1645 Out << "return X != Y; }\n";
1646 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1647 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1648 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1649 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1650 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1651 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1652 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1653 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1654 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1655 Out << "return X == Y ; }\n";
1656 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1657 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1658 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1659 Out << "return X < Y ; }\n";
1660 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1661 Out << "return X > Y ; }\n";
1662 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1663 Out << "return X <= Y ; }\n";
1664 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1665 Out << "return X >= Y ; }\n";
1670 /// Output all floating point constants that cannot be printed accurately...
1671 void CWriter::printFloatingPointConstants(Function &F) {
1672 // Scan the module for floating point constants. If any FP constant is used
1673 // in the function, we want to redirect it here so that we do not depend on
1674 // the precision of the printed form, unless the printed form preserves
1677 static unsigned FPCounter = 0;
1678 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1680 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1681 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1682 !FPConstantMap.count(FPC)) {
1683 double Val = FPC->getValue();
1685 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1687 if (FPC->getType() == Type::DoubleTy) {
1688 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1689 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1690 << "ULL; /* " << Val << " */\n";
1691 } else if (FPC->getType() == Type::FloatTy) {
1692 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1693 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1694 << "U; /* " << Val << " */\n";
1696 assert(0 && "Unknown float type!");
1703 /// printSymbolTable - Run through symbol table looking for type names. If a
1704 /// type name is found, emit its declaration...
1706 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1707 Out << "/* Helper union for bitcasts */\n";
1708 Out << "typedef union {\n";
1709 Out << " unsigned int Int32;\n";
1710 Out << " unsigned long long Int64;\n";
1711 Out << " float Float;\n";
1712 Out << " double Double;\n";
1713 Out << "} llvmBitCastUnion;\n";
1715 // We are only interested in the type plane of the symbol table.
1716 TypeSymbolTable::const_iterator I = TST.begin();
1717 TypeSymbolTable::const_iterator End = TST.end();
1719 // If there are no type names, exit early.
1720 if (I == End) return;
1722 // Print out forward declarations for structure types before anything else!
1723 Out << "/* Structure forward decls */\n";
1724 for (; I != End; ++I) {
1725 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1726 Out << Name << ";\n";
1727 TypeNames.insert(std::make_pair(I->second, Name));
1732 // Now we can print out typedefs. Above, we guaranteed that this can only be
1733 // for struct or opaque types.
1734 Out << "/* Typedefs */\n";
1735 for (I = TST.begin(); I != End; ++I) {
1736 std::string Name = "l_" + Mang->makeNameProper(I->first);
1738 printType(Out, I->second, false, Name);
1744 // Keep track of which structures have been printed so far...
1745 std::set<const StructType *> StructPrinted;
1747 // Loop over all structures then push them into the stack so they are
1748 // printed in the correct order.
1750 Out << "/* Structure contents */\n";
1751 for (I = TST.begin(); I != End; ++I)
1752 if (const StructType *STy = dyn_cast<StructType>(I->second))
1753 // Only print out used types!
1754 printContainedStructs(STy, StructPrinted);
1757 // Push the struct onto the stack and recursively push all structs
1758 // this one depends on.
1760 // TODO: Make this work properly with vector types
1762 void CWriter::printContainedStructs(const Type *Ty,
1763 std::set<const StructType*> &StructPrinted){
1764 // Don't walk through pointers.
1765 if (isa<PointerType>(Ty) || Ty->isPrimitiveType() || Ty->isInteger()) return;
1767 // Print all contained types first.
1768 for (Type::subtype_iterator I = Ty->subtype_begin(),
1769 E = Ty->subtype_end(); I != E; ++I)
1770 printContainedStructs(*I, StructPrinted);
1772 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1773 // Check to see if we have already printed this struct.
1774 if (StructPrinted.insert(STy).second) {
1775 // Print structure type out.
1776 std::string Name = TypeNames[STy];
1777 printType(Out, STy, false, Name, true);
1783 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1784 /// isStructReturn - Should this function actually return a struct by-value?
1785 bool isStructReturn = F->getFunctionType()->isStructReturn();
1787 if (F->hasInternalLinkage()) Out << "static ";
1788 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1789 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1790 switch (F->getCallingConv()) {
1791 case CallingConv::X86_StdCall:
1792 Out << "__stdcall ";
1794 case CallingConv::X86_FastCall:
1795 Out << "__fastcall ";
1799 // Loop over the arguments, printing them...
1800 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1802 std::stringstream FunctionInnards;
1804 // Print out the name...
1805 FunctionInnards << GetValueName(F) << '(';
1807 bool PrintedArg = false;
1808 if (!F->isDeclaration()) {
1809 if (!F->arg_empty()) {
1810 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1812 // If this is a struct-return function, don't print the hidden
1813 // struct-return argument.
1814 if (isStructReturn) {
1815 assert(I != E && "Invalid struct return function!");
1819 std::string ArgName;
1821 for (; I != E; ++I) {
1822 if (PrintedArg) FunctionInnards << ", ";
1823 if (I->hasName() || !Prototype)
1824 ArgName = GetValueName(I);
1827 printType(FunctionInnards, I->getType(),
1828 /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute),
1835 // Loop over the arguments, printing them.
1836 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1838 // If this is a struct-return function, don't print the hidden
1839 // struct-return argument.
1840 if (isStructReturn) {
1841 assert(I != E && "Invalid struct return function!");
1846 for (; I != E; ++I) {
1847 if (PrintedArg) FunctionInnards << ", ";
1848 printType(FunctionInnards, *I,
1849 /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute));
1855 // Finish printing arguments... if this is a vararg function, print the ...,
1856 // unless there are no known types, in which case, we just emit ().
1858 if (FT->isVarArg() && PrintedArg) {
1859 if (PrintedArg) FunctionInnards << ", ";
1860 FunctionInnards << "..."; // Output varargs portion of signature!
1861 } else if (!FT->isVarArg() && !PrintedArg) {
1862 FunctionInnards << "void"; // ret() -> ret(void) in C.
1864 FunctionInnards << ')';
1866 // Get the return tpe for the function.
1868 if (!isStructReturn)
1869 RetTy = F->getReturnType();
1871 // If this is a struct-return function, print the struct-return type.
1872 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1875 // Print out the return type and the signature built above.
1876 printType(Out, RetTy,
1877 /*isSigned=*/FT->paramHasAttr(0, FunctionType::SExtAttribute),
1878 FunctionInnards.str());
1881 static inline bool isFPIntBitCast(const Instruction &I) {
1882 if (!isa<BitCastInst>(I))
1884 const Type *SrcTy = I.getOperand(0)->getType();
1885 const Type *DstTy = I.getType();
1886 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1887 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1890 void CWriter::printFunction(Function &F) {
1891 /// isStructReturn - Should this function actually return a struct by-value?
1892 bool isStructReturn = F.getFunctionType()->isStructReturn();
1894 printFunctionSignature(&F, false);
1897 // If this is a struct return function, handle the result with magic.
1898 if (isStructReturn) {
1899 const Type *StructTy =
1900 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1902 printType(Out, StructTy, false, "StructReturn");
1903 Out << "; /* Struct return temporary */\n";
1906 printType(Out, F.arg_begin()->getType(), false,
1907 GetValueName(F.arg_begin()));
1908 Out << " = &StructReturn;\n";
1911 bool PrintedVar = false;
1913 // print local variable information for the function
1914 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1915 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1917 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
1918 Out << "; /* Address-exposed local */\n";
1920 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1922 printType(Out, I->getType(), false, GetValueName(&*I));
1925 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1927 printType(Out, I->getType(), false,
1928 GetValueName(&*I)+"__PHI_TEMPORARY");
1933 // We need a temporary for the BitCast to use so it can pluck a value out
1934 // of a union to do the BitCast. This is separate from the need for a
1935 // variable to hold the result of the BitCast.
1936 if (isFPIntBitCast(*I)) {
1937 Out << " llvmBitCastUnion " << GetValueName(&*I)
1938 << "__BITCAST_TEMPORARY;\n";
1946 if (F.hasExternalLinkage() && F.getName() == "main")
1947 Out << " CODE_FOR_MAIN();\n";
1949 // print the basic blocks
1950 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1951 if (Loop *L = LI->getLoopFor(BB)) {
1952 if (L->getHeader() == BB && L->getParentLoop() == 0)
1955 printBasicBlock(BB);
1962 void CWriter::printLoop(Loop *L) {
1963 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1964 << "' to make GCC happy */\n";
1965 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1966 BasicBlock *BB = L->getBlocks()[i];
1967 Loop *BBLoop = LI->getLoopFor(BB);
1969 printBasicBlock(BB);
1970 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
1973 Out << " } while (1); /* end of syntactic loop '"
1974 << L->getHeader()->getName() << "' */\n";
1977 void CWriter::printBasicBlock(BasicBlock *BB) {
1979 // Don't print the label for the basic block if there are no uses, or if
1980 // the only terminator use is the predecessor basic block's terminator.
1981 // We have to scan the use list because PHI nodes use basic blocks too but
1982 // do not require a label to be generated.
1984 bool NeedsLabel = false;
1985 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
1986 if (isGotoCodeNecessary(*PI, BB)) {
1991 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
1993 // Output all of the instructions in the basic block...
1994 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
1996 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
1997 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
2006 // Don't emit prefix or suffix for the terminator...
2007 visit(*BB->getTerminator());
2011 // Specific Instruction type classes... note that all of the casts are
2012 // necessary because we use the instruction classes as opaque types...
2014 void CWriter::visitReturnInst(ReturnInst &I) {
2015 // If this is a struct return function, return the temporary struct.
2016 bool isStructReturn = I.getParent()->getParent()->
2017 getFunctionType()->isStructReturn();
2019 if (isStructReturn) {
2020 Out << " return StructReturn;\n";
2024 // Don't output a void return if this is the last basic block in the function
2025 if (I.getNumOperands() == 0 &&
2026 &*--I.getParent()->getParent()->end() == I.getParent() &&
2027 !I.getParent()->size() == 1) {
2032 if (I.getNumOperands()) {
2034 writeOperand(I.getOperand(0));
2039 void CWriter::visitSwitchInst(SwitchInst &SI) {
2042 writeOperand(SI.getOperand(0));
2043 Out << ") {\n default:\n";
2044 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2045 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2047 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2049 writeOperand(SI.getOperand(i));
2051 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2052 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2053 printBranchToBlock(SI.getParent(), Succ, 2);
2054 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
2060 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2061 Out << " /*UNREACHABLE*/;\n";
2064 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2065 /// FIXME: This should be reenabled, but loop reordering safe!!
2068 if (next(Function::iterator(From)) != Function::iterator(To))
2069 return true; // Not the direct successor, we need a goto.
2071 //isa<SwitchInst>(From->getTerminator())
2073 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2078 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2079 BasicBlock *Successor,
2081 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2082 PHINode *PN = cast<PHINode>(I);
2083 // Now we have to do the printing.
2084 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2085 if (!isa<UndefValue>(IV)) {
2086 Out << std::string(Indent, ' ');
2087 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2089 Out << "; /* for PHI node */\n";
2094 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2096 if (isGotoCodeNecessary(CurBB, Succ)) {
2097 Out << std::string(Indent, ' ') << " goto ";
2103 // Branch instruction printing - Avoid printing out a branch to a basic block
2104 // that immediately succeeds the current one.
2106 void CWriter::visitBranchInst(BranchInst &I) {
2108 if (I.isConditional()) {
2109 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2111 writeOperand(I.getCondition());
2114 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2115 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2117 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2118 Out << " } else {\n";
2119 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2120 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2123 // First goto not necessary, assume second one is...
2125 writeOperand(I.getCondition());
2128 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2129 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2134 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2135 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2140 // PHI nodes get copied into temporary values at the end of predecessor basic
2141 // blocks. We now need to copy these temporary values into the REAL value for
2143 void CWriter::visitPHINode(PHINode &I) {
2145 Out << "__PHI_TEMPORARY";
2149 void CWriter::visitBinaryOperator(Instruction &I) {
2150 // binary instructions, shift instructions, setCond instructions.
2151 assert(!isa<PointerType>(I.getType()));
2153 // We must cast the results of binary operations which might be promoted.
2154 bool needsCast = false;
2155 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2156 || (I.getType() == Type::FloatTy)) {
2159 printType(Out, I.getType(), false);
2163 // If this is a negation operation, print it out as such. For FP, we don't
2164 // want to print "-0.0 - X".
2165 if (BinaryOperator::isNeg(&I)) {
2167 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2169 } else if (I.getOpcode() == Instruction::FRem) {
2170 // Output a call to fmod/fmodf instead of emitting a%b
2171 if (I.getType() == Type::FloatTy)
2175 writeOperand(I.getOperand(0));
2177 writeOperand(I.getOperand(1));
2181 // Write out the cast of the instruction's value back to the proper type
2183 bool NeedsClosingParens = writeInstructionCast(I);
2185 // Certain instructions require the operand to be forced to a specific type
2186 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2187 // below for operand 1
2188 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2190 switch (I.getOpcode()) {
2191 case Instruction::Add: Out << " + "; break;
2192 case Instruction::Sub: Out << " - "; break;
2193 case Instruction::Mul: Out << " * "; break;
2194 case Instruction::URem:
2195 case Instruction::SRem:
2196 case Instruction::FRem: Out << " % "; break;
2197 case Instruction::UDiv:
2198 case Instruction::SDiv:
2199 case Instruction::FDiv: Out << " / "; break;
2200 case Instruction::And: Out << " & "; break;
2201 case Instruction::Or: Out << " | "; break;
2202 case Instruction::Xor: Out << " ^ "; break;
2203 case Instruction::Shl : Out << " << "; break;
2204 case Instruction::LShr:
2205 case Instruction::AShr: Out << " >> "; break;
2206 default: cerr << "Invalid operator type!" << I; abort();
2209 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2210 if (NeedsClosingParens)
2219 void CWriter::visitICmpInst(ICmpInst &I) {
2220 // We must cast the results of icmp which might be promoted.
2221 bool needsCast = false;
2223 // Write out the cast of the instruction's value back to the proper type
2225 bool NeedsClosingParens = writeInstructionCast(I);
2227 // Certain icmp predicate require the operand to be forced to a specific type
2228 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2229 // below for operand 1
2230 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2232 switch (I.getPredicate()) {
2233 case ICmpInst::ICMP_EQ: Out << " == "; break;
2234 case ICmpInst::ICMP_NE: Out << " != "; break;
2235 case ICmpInst::ICMP_ULE:
2236 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2237 case ICmpInst::ICMP_UGE:
2238 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2239 case ICmpInst::ICMP_ULT:
2240 case ICmpInst::ICMP_SLT: Out << " < "; break;
2241 case ICmpInst::ICMP_UGT:
2242 case ICmpInst::ICMP_SGT: Out << " > "; break;
2243 default: cerr << "Invalid icmp predicate!" << I; abort();
2246 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2247 if (NeedsClosingParens)
2255 void CWriter::visitFCmpInst(FCmpInst &I) {
2256 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2260 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2266 switch (I.getPredicate()) {
2267 default: assert(0 && "Illegal FCmp predicate");
2268 case FCmpInst::FCMP_ORD: op = "ord"; break;
2269 case FCmpInst::FCMP_UNO: op = "uno"; break;
2270 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2271 case FCmpInst::FCMP_UNE: op = "une"; break;
2272 case FCmpInst::FCMP_ULT: op = "ult"; break;
2273 case FCmpInst::FCMP_ULE: op = "ule"; break;
2274 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2275 case FCmpInst::FCMP_UGE: op = "uge"; break;
2276 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2277 case FCmpInst::FCMP_ONE: op = "one"; break;
2278 case FCmpInst::FCMP_OLT: op = "olt"; break;
2279 case FCmpInst::FCMP_OLE: op = "ole"; break;
2280 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2281 case FCmpInst::FCMP_OGE: op = "oge"; break;
2284 Out << "llvm_fcmp_" << op << "(";
2285 // Write the first operand
2286 writeOperand(I.getOperand(0));
2288 // Write the second operand
2289 writeOperand(I.getOperand(1));
2293 static const char * getFloatBitCastField(const Type *Ty) {
2294 switch (Ty->getTypeID()) {
2295 default: assert(0 && "Invalid Type");
2296 case Type::FloatTyID: return "Float";
2297 case Type::DoubleTyID: return "Double";
2298 case Type::IntegerTyID: {
2299 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2308 void CWriter::visitCastInst(CastInst &I) {
2309 const Type *DstTy = I.getType();
2310 const Type *SrcTy = I.getOperand(0)->getType();
2312 if (isFPIntBitCast(I)) {
2313 // These int<->float and long<->double casts need to be handled specially
2314 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2315 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2316 writeOperand(I.getOperand(0));
2317 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2318 << getFloatBitCastField(I.getType());
2320 printCast(I.getOpcode(), SrcTy, DstTy);
2321 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::Int1Ty) {
2322 // Make sure we really get a sext from bool by subtracing the bool from 0
2325 writeOperand(I.getOperand(0));
2326 if (DstTy == Type::Int1Ty &&
2327 (I.getOpcode() == Instruction::Trunc ||
2328 I.getOpcode() == Instruction::FPToUI ||
2329 I.getOpcode() == Instruction::FPToSI ||
2330 I.getOpcode() == Instruction::PtrToInt)) {
2331 // Make sure we really get a trunc to bool by anding the operand with 1
2338 void CWriter::visitSelectInst(SelectInst &I) {
2340 writeOperand(I.getCondition());
2342 writeOperand(I.getTrueValue());
2344 writeOperand(I.getFalseValue());
2349 void CWriter::lowerIntrinsics(Function &F) {
2350 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2351 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2352 if (CallInst *CI = dyn_cast<CallInst>(I++))
2353 if (Function *F = CI->getCalledFunction())
2354 switch (F->getIntrinsicID()) {
2355 case Intrinsic::not_intrinsic:
2356 case Intrinsic::vastart:
2357 case Intrinsic::vacopy:
2358 case Intrinsic::vaend:
2359 case Intrinsic::returnaddress:
2360 case Intrinsic::frameaddress:
2361 case Intrinsic::setjmp:
2362 case Intrinsic::longjmp:
2363 case Intrinsic::prefetch:
2364 case Intrinsic::dbg_stoppoint:
2365 case Intrinsic::powi_f32:
2366 case Intrinsic::powi_f64:
2367 // We directly implement these intrinsics
2370 // If this is an intrinsic that directly corresponds to a GCC
2371 // builtin, we handle it.
2372 const char *BuiltinName = "";
2373 #define GET_GCC_BUILTIN_NAME
2374 #include "llvm/Intrinsics.gen"
2375 #undef GET_GCC_BUILTIN_NAME
2376 // If we handle it, don't lower it.
2377 if (BuiltinName[0]) break;
2379 // All other intrinsic calls we must lower.
2380 Instruction *Before = 0;
2381 if (CI != &BB->front())
2382 Before = prior(BasicBlock::iterator(CI));
2384 IL->LowerIntrinsicCall(CI);
2385 if (Before) { // Move iterator to instruction after call
2396 void CWriter::visitCallInst(CallInst &I) {
2397 //check if we have inline asm
2398 if (isInlineAsm(I)) {
2403 bool WroteCallee = false;
2405 // Handle intrinsic function calls first...
2406 if (Function *F = I.getCalledFunction())
2407 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2410 // If this is an intrinsic that directly corresponds to a GCC
2411 // builtin, we emit it here.
2412 const char *BuiltinName = "";
2413 #define GET_GCC_BUILTIN_NAME
2414 #include "llvm/Intrinsics.gen"
2415 #undef GET_GCC_BUILTIN_NAME
2416 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2422 case Intrinsic::vastart:
2425 Out << "va_start(*(va_list*)";
2426 writeOperand(I.getOperand(1));
2428 // Output the last argument to the enclosing function...
2429 if (I.getParent()->getParent()->arg_empty()) {
2430 cerr << "The C backend does not currently support zero "
2431 << "argument varargs functions, such as '"
2432 << I.getParent()->getParent()->getName() << "'!\n";
2435 writeOperand(--I.getParent()->getParent()->arg_end());
2438 case Intrinsic::vaend:
2439 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2440 Out << "0; va_end(*(va_list*)";
2441 writeOperand(I.getOperand(1));
2444 Out << "va_end(*(va_list*)0)";
2447 case Intrinsic::vacopy:
2449 Out << "va_copy(*(va_list*)";
2450 writeOperand(I.getOperand(1));
2451 Out << ", *(va_list*)";
2452 writeOperand(I.getOperand(2));
2455 case Intrinsic::returnaddress:
2456 Out << "__builtin_return_address(";
2457 writeOperand(I.getOperand(1));
2460 case Intrinsic::frameaddress:
2461 Out << "__builtin_frame_address(";
2462 writeOperand(I.getOperand(1));
2465 case Intrinsic::powi_f32:
2466 case Intrinsic::powi_f64:
2467 Out << "__builtin_powi(";
2468 writeOperand(I.getOperand(1));
2470 writeOperand(I.getOperand(2));
2473 case Intrinsic::setjmp:
2474 Out << "setjmp(*(jmp_buf*)";
2475 writeOperand(I.getOperand(1));
2478 case Intrinsic::longjmp:
2479 Out << "longjmp(*(jmp_buf*)";
2480 writeOperand(I.getOperand(1));
2482 writeOperand(I.getOperand(2));
2485 case Intrinsic::prefetch:
2486 Out << "LLVM_PREFETCH((const void *)";
2487 writeOperand(I.getOperand(1));
2489 writeOperand(I.getOperand(2));
2491 writeOperand(I.getOperand(3));
2494 case Intrinsic::dbg_stoppoint: {
2495 // If we use writeOperand directly we get a "u" suffix which is rejected
2497 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2501 << " \"" << SPI.getDirectory()
2502 << SPI.getFileName() << "\"\n";
2508 Value *Callee = I.getCalledValue();
2510 const PointerType *PTy = cast<PointerType>(Callee->getType());
2511 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2513 // If this is a call to a struct-return function, assign to the first
2514 // parameter instead of passing it to the call.
2515 bool isStructRet = FTy->isStructReturn();
2518 writeOperand(I.getOperand(1));
2522 if (I.isTailCall()) Out << " /*tail*/ ";
2525 // If this is an indirect call to a struct return function, we need to cast
2527 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2529 // GCC is a real PITA. It does not permit codegening casts of functions to
2530 // function pointers if they are in a call (it generates a trap instruction
2531 // instead!). We work around this by inserting a cast to void* in between
2532 // the function and the function pointer cast. Unfortunately, we can't just
2533 // form the constant expression here, because the folder will immediately
2536 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2537 // that void* and function pointers have the same size. :( To deal with this
2538 // in the common case, we handle casts where the number of arguments passed
2541 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2543 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2549 // Ok, just cast the pointer type.
2552 printType(Out, I.getCalledValue()->getType());
2554 printStructReturnPointerFunctionType(Out,
2555 cast<PointerType>(I.getCalledValue()->getType()));
2558 writeOperand(Callee);
2559 if (NeedsCast) Out << ')';
2564 unsigned NumDeclaredParams = FTy->getNumParams();
2566 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2568 if (isStructRet) { // Skip struct return argument.
2573 bool PrintedArg = false;
2575 for (; AI != AE; ++AI, ++ArgNo, ++Idx) {
2576 if (PrintedArg) Out << ", ";
2577 if (ArgNo < NumDeclaredParams &&
2578 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2580 printType(Out, FTy->getParamType(ArgNo),
2581 /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute));
2591 //This converts the llvm constraint string to something gcc is expecting.
2592 //TODO: work out platform independent constraints and factor those out
2593 // of the per target tables
2594 // handle multiple constraint codes
2595 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2597 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2599 const char** table = 0;
2601 //Grab the translation table from TargetAsmInfo if it exists
2604 const TargetMachineRegistry::Entry* Match =
2605 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2607 //Per platform Target Machines don't exist, so create it
2608 // this must be done only once
2609 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2610 TAsm = TM->getTargetAsmInfo();
2614 table = TAsm->getAsmCBE();
2616 //Search the translation table if it exists
2617 for (int i = 0; table && table[i]; i += 2)
2618 if (c.Codes[0] == table[i])
2621 //default is identity
2625 //TODO: import logic from AsmPrinter.cpp
2626 static std::string gccifyAsm(std::string asmstr) {
2627 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2628 if (asmstr[i] == '\n')
2629 asmstr.replace(i, 1, "\\n");
2630 else if (asmstr[i] == '\t')
2631 asmstr.replace(i, 1, "\\t");
2632 else if (asmstr[i] == '$') {
2633 if (asmstr[i + 1] == '{') {
2634 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2635 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2636 std::string n = "%" +
2637 asmstr.substr(a + 1, b - a - 1) +
2638 asmstr.substr(i + 2, a - i - 2);
2639 asmstr.replace(i, b - i + 1, n);
2642 asmstr.replace(i, 1, "%");
2644 else if (asmstr[i] == '%')//grr
2645 { asmstr.replace(i, 1, "%%"); ++i;}
2650 //TODO: assumptions about what consume arguments from the call are likely wrong
2651 // handle communitivity
2652 void CWriter::visitInlineAsm(CallInst &CI) {
2653 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2654 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2655 std::vector<std::pair<std::string, Value*> > Input;
2656 std::vector<std::pair<std::string, Value*> > Output;
2657 std::string Clobber;
2658 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2659 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2660 E = Constraints.end(); I != E; ++I) {
2661 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2663 InterpretASMConstraint(*I);
2666 assert(0 && "Unknown asm constraint");
2668 case InlineAsm::isInput: {
2670 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2671 ++count; //consume arg
2675 case InlineAsm::isOutput: {
2677 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2678 count ? CI.getOperand(count) : &CI));
2679 ++count; //consume arg
2683 case InlineAsm::isClobber: {
2685 Clobber += ",\"" + c + "\"";
2691 //fix up the asm string for gcc
2692 std::string asmstr = gccifyAsm(as->getAsmString());
2694 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2696 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2697 E = Output.end(); I != E; ++I) {
2698 Out << "\"" << I->first << "\"(";
2699 writeOperandRaw(I->second);
2705 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2706 E = Input.end(); I != E; ++I) {
2707 Out << "\"" << I->first << "\"(";
2708 writeOperandRaw(I->second);
2714 Out << "\n :" << Clobber.substr(1);
2718 void CWriter::visitMallocInst(MallocInst &I) {
2719 assert(0 && "lowerallocations pass didn't work!");
2722 void CWriter::visitAllocaInst(AllocaInst &I) {
2724 printType(Out, I.getType());
2725 Out << ") alloca(sizeof(";
2726 printType(Out, I.getType()->getElementType());
2728 if (I.isArrayAllocation()) {
2730 writeOperand(I.getOperand(0));
2735 void CWriter::visitFreeInst(FreeInst &I) {
2736 assert(0 && "lowerallocations pass didn't work!");
2739 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2740 gep_type_iterator E) {
2741 bool HasImplicitAddress = false;
2742 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2743 if (isa<GlobalValue>(Ptr)) {
2744 HasImplicitAddress = true;
2745 } else if (isDirectAlloca(Ptr)) {
2746 HasImplicitAddress = true;
2750 if (!HasImplicitAddress)
2751 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2753 writeOperandInternal(Ptr);
2757 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2758 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2761 writeOperandInternal(Ptr);
2763 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2765 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2768 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2769 "Can only have implicit address with direct accessing");
2771 if (HasImplicitAddress) {
2773 } else if (CI && CI->isNullValue()) {
2774 gep_type_iterator TmpI = I; ++TmpI;
2776 // Print out the -> operator if possible...
2777 if (TmpI != E && isa<StructType>(*TmpI)) {
2778 Out << (HasImplicitAddress ? "." : "->");
2779 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2785 if (isa<StructType>(*I)) {
2786 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2789 writeOperand(I.getOperand());
2794 void CWriter::visitLoadInst(LoadInst &I) {
2796 if (I.isVolatile()) {
2798 printType(Out, I.getType(), false, "volatile*");
2802 writeOperand(I.getOperand(0));
2808 void CWriter::visitStoreInst(StoreInst &I) {
2810 if (I.isVolatile()) {
2812 printType(Out, I.getOperand(0)->getType(), false, " volatile*");
2815 writeOperand(I.getPointerOperand());
2816 if (I.isVolatile()) Out << ')';
2818 Value *Operand = I.getOperand(0);
2819 Constant *BitMask = 0;
2820 if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
2821 if (!ITy->isPowerOf2ByteWidth())
2822 // We have a bit width that doesn't match an even power-of-2 byte
2823 // size. Consequently we must & the value with the type's bit mask
2824 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
2827 writeOperand(Operand);
2830 printConstant(BitMask);
2835 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2837 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2841 void CWriter::visitVAArgInst(VAArgInst &I) {
2842 Out << "va_arg(*(va_list*)";
2843 writeOperand(I.getOperand(0));
2845 printType(Out, I.getType());
2849 //===----------------------------------------------------------------------===//
2850 // External Interface declaration
2851 //===----------------------------------------------------------------------===//
2853 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2855 CodeGenFileType FileType,
2857 if (FileType != TargetMachine::AssemblyFile) return true;
2859 PM.add(createLowerGCPass());
2860 PM.add(createLowerAllocationsPass(true));
2861 PM.add(createLowerInvokePass());
2862 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2863 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2864 PM.add(new CWriter(o));