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 << "#define inline\n"
1298 << "#define alloca(x) _alloca(x)\n"
1300 << "#include <alloca.h>\n"
1303 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1304 // If we aren't being compiled with GCC, just drop these attributes.
1305 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1306 << "#define __attribute__(X)\n"
1309 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1310 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1311 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1312 << "#elif defined(__GNUC__)\n"
1313 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1315 << "#define __EXTERNAL_WEAK__\n"
1318 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1319 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1320 << "#define __ATTRIBUTE_WEAK__\n"
1321 << "#elif defined(__GNUC__)\n"
1322 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1324 << "#define __ATTRIBUTE_WEAK__\n"
1327 // Add hidden visibility support. FIXME: APPLE_CC?
1328 Out << "#if defined(__GNUC__)\n"
1329 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1332 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1333 // From the GCC documentation:
1335 // double __builtin_nan (const char *str)
1337 // This is an implementation of the ISO C99 function nan.
1339 // Since ISO C99 defines this function in terms of strtod, which we do
1340 // not implement, a description of the parsing is in order. The string is
1341 // parsed as by strtol; that is, the base is recognized by leading 0 or
1342 // 0x prefixes. The number parsed is placed in the significand such that
1343 // the least significant bit of the number is at the least significant
1344 // bit of the significand. The number is truncated to fit the significand
1345 // field provided. The significand is forced to be a quiet NaN.
1347 // This function, if given a string literal, is evaluated early enough
1348 // that it is considered a compile-time constant.
1350 // float __builtin_nanf (const char *str)
1352 // Similar to __builtin_nan, except the return type is float.
1354 // double __builtin_inf (void)
1356 // Similar to __builtin_huge_val, except a warning is generated if the
1357 // target floating-point format does not support infinities. This
1358 // function is suitable for implementing the ISO C99 macro INFINITY.
1360 // float __builtin_inff (void)
1362 // Similar to __builtin_inf, except the return type is float.
1363 Out << "#ifdef __GNUC__\n"
1364 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1365 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1366 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1367 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1368 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1369 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1370 << "#define LLVM_PREFETCH(addr,rw,locality) "
1371 "__builtin_prefetch(addr,rw,locality)\n"
1372 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1373 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1374 << "#define LLVM_ASM __asm__\n"
1376 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1377 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1378 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1379 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1380 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1381 << "#define LLVM_INFF 0.0F /* Float */\n"
1382 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1383 << "#define __ATTRIBUTE_CTOR__\n"
1384 << "#define __ATTRIBUTE_DTOR__\n"
1385 << "#define LLVM_ASM(X)\n"
1388 // Output target-specific code that should be inserted into main.
1389 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1390 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1391 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1392 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1393 << "defined(__x86_64__)\n"
1394 << "#undef CODE_FOR_MAIN\n"
1395 << "#define CODE_FOR_MAIN() \\\n"
1396 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1397 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1398 << "#endif\n#endif\n";
1402 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1403 /// the StaticTors set.
1404 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1405 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1406 if (!InitList) return;
1408 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1409 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1410 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1412 if (CS->getOperand(1)->isNullValue())
1413 return; // Found a null terminator, exit printing.
1414 Constant *FP = CS->getOperand(1);
1415 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1417 FP = CE->getOperand(0);
1418 if (Function *F = dyn_cast<Function>(FP))
1419 StaticTors.insert(F);
1423 enum SpecialGlobalClass {
1425 GlobalCtors, GlobalDtors,
1429 /// getGlobalVariableClass - If this is a global that is specially recognized
1430 /// by LLVM, return a code that indicates how we should handle it.
1431 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1432 // If this is a global ctors/dtors list, handle it now.
1433 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1434 if (GV->getName() == "llvm.global_ctors")
1436 else if (GV->getName() == "llvm.global_dtors")
1440 // Otherwise, it it is other metadata, don't print it. This catches things
1441 // like debug information.
1442 if (GV->getSection() == "llvm.metadata")
1449 bool CWriter::doInitialization(Module &M) {
1453 TD = new TargetData(&M);
1454 IL = new IntrinsicLowering(*TD);
1455 IL->AddPrototypes(M);
1457 // Ensure that all structure types have names...
1458 Mang = new Mangler(M);
1459 Mang->markCharUnacceptable('.');
1461 // Keep track of which functions are static ctors/dtors so they can have
1462 // an attribute added to their prototypes.
1463 std::set<Function*> StaticCtors, StaticDtors;
1464 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1466 switch (getGlobalVariableClass(I)) {
1469 FindStaticTors(I, StaticCtors);
1472 FindStaticTors(I, StaticDtors);
1477 // get declaration for alloca
1478 Out << "/* Provide Declarations */\n";
1479 Out << "#include <stdarg.h>\n"; // Varargs support
1480 Out << "#include <setjmp.h>\n"; // Unwind support
1481 generateCompilerSpecificCode(Out);
1483 // Provide a definition for `bool' if not compiling with a C++ compiler.
1485 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1487 << "\n\n/* Support for floating point constants */\n"
1488 << "typedef unsigned long long ConstantDoubleTy;\n"
1489 << "typedef unsigned int ConstantFloatTy;\n"
1491 << "\n\n/* Global Declarations */\n";
1493 // First output all the declarations for the program, because C requires
1494 // Functions & globals to be declared before they are used.
1497 // Loop over the symbol table, emitting all named constants...
1498 printModuleTypes(M.getTypeSymbolTable());
1500 // Global variable declarations...
1501 if (!M.global_empty()) {
1502 Out << "\n/* External Global Variable Declarations */\n";
1503 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1505 if (I->hasExternalLinkage()) {
1507 printType(Out, I->getType()->getElementType(), false,
1510 } else if (I->hasDLLImportLinkage()) {
1511 Out << "__declspec(dllimport) ";
1512 printType(Out, I->getType()->getElementType(), false,
1515 } else if (I->hasExternalWeakLinkage()) {
1517 printType(Out, I->getType()->getElementType(), false,
1519 Out << " __EXTERNAL_WEAK__ ;\n";
1524 // Function declarations
1525 Out << "\n/* Function Declarations */\n";
1526 Out << "double fmod(double, double);\n"; // Support for FP rem
1527 Out << "float fmodf(float, float);\n";
1529 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1530 // Don't print declarations for intrinsic functions.
1531 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1532 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1533 if (I->hasExternalWeakLinkage())
1535 printFunctionSignature(I, true);
1536 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1537 Out << " __ATTRIBUTE_WEAK__";
1538 if (I->hasExternalWeakLinkage())
1539 Out << " __EXTERNAL_WEAK__";
1540 if (StaticCtors.count(I))
1541 Out << " __ATTRIBUTE_CTOR__";
1542 if (StaticDtors.count(I))
1543 Out << " __ATTRIBUTE_DTOR__";
1544 if (I->hasHiddenVisibility())
1545 Out << " __HIDDEN__";
1547 if (I->hasName() && I->getName()[0] == 1)
1548 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1554 // Output the global variable declarations
1555 if (!M.global_empty()) {
1556 Out << "\n\n/* Global Variable Declarations */\n";
1557 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1559 if (!I->isDeclaration()) {
1560 // Ignore special globals, such as debug info.
1561 if (getGlobalVariableClass(I))
1564 if (I->hasInternalLinkage())
1568 printType(Out, I->getType()->getElementType(), false,
1571 if (I->hasLinkOnceLinkage())
1572 Out << " __attribute__((common))";
1573 else if (I->hasWeakLinkage())
1574 Out << " __ATTRIBUTE_WEAK__";
1575 else if (I->hasExternalWeakLinkage())
1576 Out << " __EXTERNAL_WEAK__";
1577 if (I->hasHiddenVisibility())
1578 Out << " __HIDDEN__";
1583 // Output the global variable definitions and contents...
1584 if (!M.global_empty()) {
1585 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1586 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1588 if (!I->isDeclaration()) {
1589 // Ignore special globals, such as debug info.
1590 if (getGlobalVariableClass(I))
1593 if (I->hasInternalLinkage())
1595 else if (I->hasDLLImportLinkage())
1596 Out << "__declspec(dllimport) ";
1597 else if (I->hasDLLExportLinkage())
1598 Out << "__declspec(dllexport) ";
1600 printType(Out, I->getType()->getElementType(), false,
1602 if (I->hasLinkOnceLinkage())
1603 Out << " __attribute__((common))";
1604 else if (I->hasWeakLinkage())
1605 Out << " __ATTRIBUTE_WEAK__";
1607 if (I->hasHiddenVisibility())
1608 Out << " __HIDDEN__";
1610 // If the initializer is not null, emit the initializer. If it is null,
1611 // we try to avoid emitting large amounts of zeros. The problem with
1612 // this, however, occurs when the variable has weak linkage. In this
1613 // case, the assembler will complain about the variable being both weak
1614 // and common, so we disable this optimization.
1615 if (!I->getInitializer()->isNullValue()) {
1617 writeOperand(I->getInitializer());
1618 } else if (I->hasWeakLinkage()) {
1619 // We have to specify an initializer, but it doesn't have to be
1620 // complete. If the value is an aggregate, print out { 0 }, and let
1621 // the compiler figure out the rest of the zeros.
1623 if (isa<StructType>(I->getInitializer()->getType()) ||
1624 isa<ArrayType>(I->getInitializer()->getType()) ||
1625 isa<VectorType>(I->getInitializer()->getType())) {
1628 // Just print it out normally.
1629 writeOperand(I->getInitializer());
1637 Out << "\n\n/* Function Bodies */\n";
1639 // Emit some helper functions for dealing with FCMP instruction's
1641 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1642 Out << "return X == X && Y == Y; }\n";
1643 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1644 Out << "return X != X || Y != Y; }\n";
1645 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1646 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1647 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1648 Out << "return X != Y; }\n";
1649 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1650 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1651 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1652 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1653 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1654 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1655 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1656 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1657 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1658 Out << "return X == Y ; }\n";
1659 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1660 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1661 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1662 Out << "return X < Y ; }\n";
1663 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1664 Out << "return X > Y ; }\n";
1665 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1666 Out << "return X <= Y ; }\n";
1667 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1668 Out << "return X >= Y ; }\n";
1673 /// Output all floating point constants that cannot be printed accurately...
1674 void CWriter::printFloatingPointConstants(Function &F) {
1675 // Scan the module for floating point constants. If any FP constant is used
1676 // in the function, we want to redirect it here so that we do not depend on
1677 // the precision of the printed form, unless the printed form preserves
1680 static unsigned FPCounter = 0;
1681 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1683 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1684 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1685 !FPConstantMap.count(FPC)) {
1686 double Val = FPC->getValue();
1688 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1690 if (FPC->getType() == Type::DoubleTy) {
1691 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1692 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1693 << "ULL; /* " << Val << " */\n";
1694 } else if (FPC->getType() == Type::FloatTy) {
1695 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1696 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1697 << "U; /* " << Val << " */\n";
1699 assert(0 && "Unknown float type!");
1706 /// printSymbolTable - Run through symbol table looking for type names. If a
1707 /// type name is found, emit its declaration...
1709 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1710 Out << "/* Helper union for bitcasts */\n";
1711 Out << "typedef union {\n";
1712 Out << " unsigned int Int32;\n";
1713 Out << " unsigned long long Int64;\n";
1714 Out << " float Float;\n";
1715 Out << " double Double;\n";
1716 Out << "} llvmBitCastUnion;\n";
1718 // We are only interested in the type plane of the symbol table.
1719 TypeSymbolTable::const_iterator I = TST.begin();
1720 TypeSymbolTable::const_iterator End = TST.end();
1722 // If there are no type names, exit early.
1723 if (I == End) return;
1725 // Print out forward declarations for structure types before anything else!
1726 Out << "/* Structure forward decls */\n";
1727 for (; I != End; ++I) {
1728 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1729 Out << Name << ";\n";
1730 TypeNames.insert(std::make_pair(I->second, Name));
1735 // Now we can print out typedefs. Above, we guaranteed that this can only be
1736 // for struct or opaque types.
1737 Out << "/* Typedefs */\n";
1738 for (I = TST.begin(); I != End; ++I) {
1739 std::string Name = "l_" + Mang->makeNameProper(I->first);
1741 printType(Out, I->second, false, Name);
1747 // Keep track of which structures have been printed so far...
1748 std::set<const StructType *> StructPrinted;
1750 // Loop over all structures then push them into the stack so they are
1751 // printed in the correct order.
1753 Out << "/* Structure contents */\n";
1754 for (I = TST.begin(); I != End; ++I)
1755 if (const StructType *STy = dyn_cast<StructType>(I->second))
1756 // Only print out used types!
1757 printContainedStructs(STy, StructPrinted);
1760 // Push the struct onto the stack and recursively push all structs
1761 // this one depends on.
1763 // TODO: Make this work properly with vector types
1765 void CWriter::printContainedStructs(const Type *Ty,
1766 std::set<const StructType*> &StructPrinted){
1767 // Don't walk through pointers.
1768 if (isa<PointerType>(Ty) || Ty->isPrimitiveType() || Ty->isInteger()) return;
1770 // Print all contained types first.
1771 for (Type::subtype_iterator I = Ty->subtype_begin(),
1772 E = Ty->subtype_end(); I != E; ++I)
1773 printContainedStructs(*I, StructPrinted);
1775 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1776 // Check to see if we have already printed this struct.
1777 if (StructPrinted.insert(STy).second) {
1778 // Print structure type out.
1779 std::string Name = TypeNames[STy];
1780 printType(Out, STy, false, Name, true);
1786 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1787 /// isStructReturn - Should this function actually return a struct by-value?
1788 bool isStructReturn = F->getFunctionType()->isStructReturn();
1790 if (F->hasInternalLinkage()) Out << "static ";
1791 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1792 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1793 switch (F->getCallingConv()) {
1794 case CallingConv::X86_StdCall:
1795 Out << "__stdcall ";
1797 case CallingConv::X86_FastCall:
1798 Out << "__fastcall ";
1802 // Loop over the arguments, printing them...
1803 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1805 std::stringstream FunctionInnards;
1807 // Print out the name...
1808 FunctionInnards << GetValueName(F) << '(';
1810 bool PrintedArg = false;
1811 if (!F->isDeclaration()) {
1812 if (!F->arg_empty()) {
1813 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1815 // If this is a struct-return function, don't print the hidden
1816 // struct-return argument.
1817 if (isStructReturn) {
1818 assert(I != E && "Invalid struct return function!");
1822 std::string ArgName;
1824 for (; I != E; ++I) {
1825 if (PrintedArg) FunctionInnards << ", ";
1826 if (I->hasName() || !Prototype)
1827 ArgName = GetValueName(I);
1830 printType(FunctionInnards, I->getType(),
1831 /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute),
1838 // Loop over the arguments, printing them.
1839 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1841 // If this is a struct-return function, don't print the hidden
1842 // struct-return argument.
1843 if (isStructReturn) {
1844 assert(I != E && "Invalid struct return function!");
1849 for (; I != E; ++I) {
1850 if (PrintedArg) FunctionInnards << ", ";
1851 printType(FunctionInnards, *I,
1852 /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute));
1858 // Finish printing arguments... if this is a vararg function, print the ...,
1859 // unless there are no known types, in which case, we just emit ().
1861 if (FT->isVarArg() && PrintedArg) {
1862 if (PrintedArg) FunctionInnards << ", ";
1863 FunctionInnards << "..."; // Output varargs portion of signature!
1864 } else if (!FT->isVarArg() && !PrintedArg) {
1865 FunctionInnards << "void"; // ret() -> ret(void) in C.
1867 FunctionInnards << ')';
1869 // Get the return tpe for the function.
1871 if (!isStructReturn)
1872 RetTy = F->getReturnType();
1874 // If this is a struct-return function, print the struct-return type.
1875 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1878 // Print out the return type and the signature built above.
1879 printType(Out, RetTy,
1880 /*isSigned=*/FT->paramHasAttr(0, FunctionType::SExtAttribute),
1881 FunctionInnards.str());
1884 static inline bool isFPIntBitCast(const Instruction &I) {
1885 if (!isa<BitCastInst>(I))
1887 const Type *SrcTy = I.getOperand(0)->getType();
1888 const Type *DstTy = I.getType();
1889 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1890 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1893 void CWriter::printFunction(Function &F) {
1894 /// isStructReturn - Should this function actually return a struct by-value?
1895 bool isStructReturn = F.getFunctionType()->isStructReturn();
1897 printFunctionSignature(&F, false);
1900 // If this is a struct return function, handle the result with magic.
1901 if (isStructReturn) {
1902 const Type *StructTy =
1903 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1905 printType(Out, StructTy, false, "StructReturn");
1906 Out << "; /* Struct return temporary */\n";
1909 printType(Out, F.arg_begin()->getType(), false,
1910 GetValueName(F.arg_begin()));
1911 Out << " = &StructReturn;\n";
1914 bool PrintedVar = false;
1916 // print local variable information for the function
1917 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1918 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1920 printType(Out, AI->getAllocatedType(), false, GetValueName(AI));
1921 Out << "; /* Address-exposed local */\n";
1923 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1925 printType(Out, I->getType(), false, GetValueName(&*I));
1928 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1930 printType(Out, I->getType(), false,
1931 GetValueName(&*I)+"__PHI_TEMPORARY");
1936 // We need a temporary for the BitCast to use so it can pluck a value out
1937 // of a union to do the BitCast. This is separate from the need for a
1938 // variable to hold the result of the BitCast.
1939 if (isFPIntBitCast(*I)) {
1940 Out << " llvmBitCastUnion " << GetValueName(&*I)
1941 << "__BITCAST_TEMPORARY;\n";
1949 if (F.hasExternalLinkage() && F.getName() == "main")
1950 Out << " CODE_FOR_MAIN();\n";
1952 // print the basic blocks
1953 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1954 if (Loop *L = LI->getLoopFor(BB)) {
1955 if (L->getHeader() == BB && L->getParentLoop() == 0)
1958 printBasicBlock(BB);
1965 void CWriter::printLoop(Loop *L) {
1966 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1967 << "' to make GCC happy */\n";
1968 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1969 BasicBlock *BB = L->getBlocks()[i];
1970 Loop *BBLoop = LI->getLoopFor(BB);
1972 printBasicBlock(BB);
1973 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
1976 Out << " } while (1); /* end of syntactic loop '"
1977 << L->getHeader()->getName() << "' */\n";
1980 void CWriter::printBasicBlock(BasicBlock *BB) {
1982 // Don't print the label for the basic block if there are no uses, or if
1983 // the only terminator use is the predecessor basic block's terminator.
1984 // We have to scan the use list because PHI nodes use basic blocks too but
1985 // do not require a label to be generated.
1987 bool NeedsLabel = false;
1988 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
1989 if (isGotoCodeNecessary(*PI, BB)) {
1994 if (NeedsLabel) Out << GetValueName(BB) << ":\n";
1996 // Output all of the instructions in the basic block...
1997 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
1999 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
2000 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
2009 // Don't emit prefix or suffix for the terminator...
2010 visit(*BB->getTerminator());
2014 // Specific Instruction type classes... note that all of the casts are
2015 // necessary because we use the instruction classes as opaque types...
2017 void CWriter::visitReturnInst(ReturnInst &I) {
2018 // If this is a struct return function, return the temporary struct.
2019 bool isStructReturn = I.getParent()->getParent()->
2020 getFunctionType()->isStructReturn();
2022 if (isStructReturn) {
2023 Out << " return StructReturn;\n";
2027 // Don't output a void return if this is the last basic block in the function
2028 if (I.getNumOperands() == 0 &&
2029 &*--I.getParent()->getParent()->end() == I.getParent() &&
2030 !I.getParent()->size() == 1) {
2035 if (I.getNumOperands()) {
2037 writeOperand(I.getOperand(0));
2042 void CWriter::visitSwitchInst(SwitchInst &SI) {
2045 writeOperand(SI.getOperand(0));
2046 Out << ") {\n default:\n";
2047 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2048 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2050 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2052 writeOperand(SI.getOperand(i));
2054 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2055 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2056 printBranchToBlock(SI.getParent(), Succ, 2);
2057 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
2063 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2064 Out << " /*UNREACHABLE*/;\n";
2067 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2068 /// FIXME: This should be reenabled, but loop reordering safe!!
2071 if (next(Function::iterator(From)) != Function::iterator(To))
2072 return true; // Not the direct successor, we need a goto.
2074 //isa<SwitchInst>(From->getTerminator())
2076 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2081 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2082 BasicBlock *Successor,
2084 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2085 PHINode *PN = cast<PHINode>(I);
2086 // Now we have to do the printing.
2087 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2088 if (!isa<UndefValue>(IV)) {
2089 Out << std::string(Indent, ' ');
2090 Out << " " << GetValueName(I) << "__PHI_TEMPORARY = ";
2092 Out << "; /* for PHI node */\n";
2097 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2099 if (isGotoCodeNecessary(CurBB, Succ)) {
2100 Out << std::string(Indent, ' ') << " goto ";
2106 // Branch instruction printing - Avoid printing out a branch to a basic block
2107 // that immediately succeeds the current one.
2109 void CWriter::visitBranchInst(BranchInst &I) {
2111 if (I.isConditional()) {
2112 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2114 writeOperand(I.getCondition());
2117 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2118 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2120 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2121 Out << " } else {\n";
2122 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2123 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2126 // First goto not necessary, assume second one is...
2128 writeOperand(I.getCondition());
2131 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2132 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2137 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2138 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2143 // PHI nodes get copied into temporary values at the end of predecessor basic
2144 // blocks. We now need to copy these temporary values into the REAL value for
2146 void CWriter::visitPHINode(PHINode &I) {
2148 Out << "__PHI_TEMPORARY";
2152 void CWriter::visitBinaryOperator(Instruction &I) {
2153 // binary instructions, shift instructions, setCond instructions.
2154 assert(!isa<PointerType>(I.getType()));
2156 // We must cast the results of binary operations which might be promoted.
2157 bool needsCast = false;
2158 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2159 || (I.getType() == Type::FloatTy)) {
2162 printType(Out, I.getType(), false);
2166 // If this is a negation operation, print it out as such. For FP, we don't
2167 // want to print "-0.0 - X".
2168 if (BinaryOperator::isNeg(&I)) {
2170 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2172 } else if (I.getOpcode() == Instruction::FRem) {
2173 // Output a call to fmod/fmodf instead of emitting a%b
2174 if (I.getType() == Type::FloatTy)
2178 writeOperand(I.getOperand(0));
2180 writeOperand(I.getOperand(1));
2184 // Write out the cast of the instruction's value back to the proper type
2186 bool NeedsClosingParens = writeInstructionCast(I);
2188 // Certain instructions require the operand to be forced to a specific type
2189 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2190 // below for operand 1
2191 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2193 switch (I.getOpcode()) {
2194 case Instruction::Add: Out << " + "; break;
2195 case Instruction::Sub: Out << " - "; break;
2196 case Instruction::Mul: Out << " * "; break;
2197 case Instruction::URem:
2198 case Instruction::SRem:
2199 case Instruction::FRem: Out << " % "; break;
2200 case Instruction::UDiv:
2201 case Instruction::SDiv:
2202 case Instruction::FDiv: Out << " / "; break;
2203 case Instruction::And: Out << " & "; break;
2204 case Instruction::Or: Out << " | "; break;
2205 case Instruction::Xor: Out << " ^ "; break;
2206 case Instruction::Shl : Out << " << "; break;
2207 case Instruction::LShr:
2208 case Instruction::AShr: Out << " >> "; break;
2209 default: cerr << "Invalid operator type!" << I; abort();
2212 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2213 if (NeedsClosingParens)
2222 void CWriter::visitICmpInst(ICmpInst &I) {
2223 // We must cast the results of icmp which might be promoted.
2224 bool needsCast = false;
2226 // Write out the cast of the instruction's value back to the proper type
2228 bool NeedsClosingParens = writeInstructionCast(I);
2230 // Certain icmp predicate require the operand to be forced to a specific type
2231 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2232 // below for operand 1
2233 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2235 switch (I.getPredicate()) {
2236 case ICmpInst::ICMP_EQ: Out << " == "; break;
2237 case ICmpInst::ICMP_NE: Out << " != "; break;
2238 case ICmpInst::ICMP_ULE:
2239 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2240 case ICmpInst::ICMP_UGE:
2241 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2242 case ICmpInst::ICMP_ULT:
2243 case ICmpInst::ICMP_SLT: Out << " < "; break;
2244 case ICmpInst::ICMP_UGT:
2245 case ICmpInst::ICMP_SGT: Out << " > "; break;
2246 default: cerr << "Invalid icmp predicate!" << I; abort();
2249 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2250 if (NeedsClosingParens)
2258 void CWriter::visitFCmpInst(FCmpInst &I) {
2259 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2263 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2269 switch (I.getPredicate()) {
2270 default: assert(0 && "Illegal FCmp predicate");
2271 case FCmpInst::FCMP_ORD: op = "ord"; break;
2272 case FCmpInst::FCMP_UNO: op = "uno"; break;
2273 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2274 case FCmpInst::FCMP_UNE: op = "une"; break;
2275 case FCmpInst::FCMP_ULT: op = "ult"; break;
2276 case FCmpInst::FCMP_ULE: op = "ule"; break;
2277 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2278 case FCmpInst::FCMP_UGE: op = "uge"; break;
2279 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2280 case FCmpInst::FCMP_ONE: op = "one"; break;
2281 case FCmpInst::FCMP_OLT: op = "olt"; break;
2282 case FCmpInst::FCMP_OLE: op = "ole"; break;
2283 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2284 case FCmpInst::FCMP_OGE: op = "oge"; break;
2287 Out << "llvm_fcmp_" << op << "(";
2288 // Write the first operand
2289 writeOperand(I.getOperand(0));
2291 // Write the second operand
2292 writeOperand(I.getOperand(1));
2296 static const char * getFloatBitCastField(const Type *Ty) {
2297 switch (Ty->getTypeID()) {
2298 default: assert(0 && "Invalid Type");
2299 case Type::FloatTyID: return "Float";
2300 case Type::DoubleTyID: return "Double";
2301 case Type::IntegerTyID: {
2302 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2311 void CWriter::visitCastInst(CastInst &I) {
2312 const Type *DstTy = I.getType();
2313 const Type *SrcTy = I.getOperand(0)->getType();
2315 if (isFPIntBitCast(I)) {
2316 // These int<->float and long<->double casts need to be handled specially
2317 Out << GetValueName(&I) << "__BITCAST_TEMPORARY."
2318 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2319 writeOperand(I.getOperand(0));
2320 Out << ", " << GetValueName(&I) << "__BITCAST_TEMPORARY."
2321 << getFloatBitCastField(I.getType());
2323 printCast(I.getOpcode(), SrcTy, DstTy);
2324 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::Int1Ty) {
2325 // Make sure we really get a sext from bool by subtracing the bool from 0
2328 writeOperand(I.getOperand(0));
2329 if (DstTy == Type::Int1Ty &&
2330 (I.getOpcode() == Instruction::Trunc ||
2331 I.getOpcode() == Instruction::FPToUI ||
2332 I.getOpcode() == Instruction::FPToSI ||
2333 I.getOpcode() == Instruction::PtrToInt)) {
2334 // Make sure we really get a trunc to bool by anding the operand with 1
2341 void CWriter::visitSelectInst(SelectInst &I) {
2343 writeOperand(I.getCondition());
2345 writeOperand(I.getTrueValue());
2347 writeOperand(I.getFalseValue());
2352 void CWriter::lowerIntrinsics(Function &F) {
2353 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2354 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2355 if (CallInst *CI = dyn_cast<CallInst>(I++))
2356 if (Function *F = CI->getCalledFunction())
2357 switch (F->getIntrinsicID()) {
2358 case Intrinsic::not_intrinsic:
2359 case Intrinsic::vastart:
2360 case Intrinsic::vacopy:
2361 case Intrinsic::vaend:
2362 case Intrinsic::returnaddress:
2363 case Intrinsic::frameaddress:
2364 case Intrinsic::setjmp:
2365 case Intrinsic::longjmp:
2366 case Intrinsic::prefetch:
2367 case Intrinsic::dbg_stoppoint:
2368 case Intrinsic::powi_f32:
2369 case Intrinsic::powi_f64:
2370 // We directly implement these intrinsics
2373 // If this is an intrinsic that directly corresponds to a GCC
2374 // builtin, we handle it.
2375 const char *BuiltinName = "";
2376 #define GET_GCC_BUILTIN_NAME
2377 #include "llvm/Intrinsics.gen"
2378 #undef GET_GCC_BUILTIN_NAME
2379 // If we handle it, don't lower it.
2380 if (BuiltinName[0]) break;
2382 // All other intrinsic calls we must lower.
2383 Instruction *Before = 0;
2384 if (CI != &BB->front())
2385 Before = prior(BasicBlock::iterator(CI));
2387 IL->LowerIntrinsicCall(CI);
2388 if (Before) { // Move iterator to instruction after call
2399 void CWriter::visitCallInst(CallInst &I) {
2400 //check if we have inline asm
2401 if (isInlineAsm(I)) {
2406 bool WroteCallee = false;
2408 // Handle intrinsic function calls first...
2409 if (Function *F = I.getCalledFunction())
2410 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2413 // If this is an intrinsic that directly corresponds to a GCC
2414 // builtin, we emit it here.
2415 const char *BuiltinName = "";
2416 #define GET_GCC_BUILTIN_NAME
2417 #include "llvm/Intrinsics.gen"
2418 #undef GET_GCC_BUILTIN_NAME
2419 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2425 case Intrinsic::vastart:
2428 Out << "va_start(*(va_list*)";
2429 writeOperand(I.getOperand(1));
2431 // Output the last argument to the enclosing function...
2432 if (I.getParent()->getParent()->arg_empty()) {
2433 cerr << "The C backend does not currently support zero "
2434 << "argument varargs functions, such as '"
2435 << I.getParent()->getParent()->getName() << "'!\n";
2438 writeOperand(--I.getParent()->getParent()->arg_end());
2441 case Intrinsic::vaend:
2442 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2443 Out << "0; va_end(*(va_list*)";
2444 writeOperand(I.getOperand(1));
2447 Out << "va_end(*(va_list*)0)";
2450 case Intrinsic::vacopy:
2452 Out << "va_copy(*(va_list*)";
2453 writeOperand(I.getOperand(1));
2454 Out << ", *(va_list*)";
2455 writeOperand(I.getOperand(2));
2458 case Intrinsic::returnaddress:
2459 Out << "__builtin_return_address(";
2460 writeOperand(I.getOperand(1));
2463 case Intrinsic::frameaddress:
2464 Out << "__builtin_frame_address(";
2465 writeOperand(I.getOperand(1));
2468 case Intrinsic::powi_f32:
2469 case Intrinsic::powi_f64:
2470 Out << "__builtin_powi(";
2471 writeOperand(I.getOperand(1));
2473 writeOperand(I.getOperand(2));
2476 case Intrinsic::setjmp:
2477 Out << "setjmp(*(jmp_buf*)";
2478 writeOperand(I.getOperand(1));
2481 case Intrinsic::longjmp:
2482 Out << "longjmp(*(jmp_buf*)";
2483 writeOperand(I.getOperand(1));
2485 writeOperand(I.getOperand(2));
2488 case Intrinsic::prefetch:
2489 Out << "LLVM_PREFETCH((const void *)";
2490 writeOperand(I.getOperand(1));
2492 writeOperand(I.getOperand(2));
2494 writeOperand(I.getOperand(3));
2497 case Intrinsic::dbg_stoppoint: {
2498 // If we use writeOperand directly we get a "u" suffix which is rejected
2500 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2504 << " \"" << SPI.getDirectory()
2505 << SPI.getFileName() << "\"\n";
2511 Value *Callee = I.getCalledValue();
2513 const PointerType *PTy = cast<PointerType>(Callee->getType());
2514 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2516 // If this is a call to a struct-return function, assign to the first
2517 // parameter instead of passing it to the call.
2518 bool isStructRet = FTy->isStructReturn();
2521 writeOperand(I.getOperand(1));
2525 if (I.isTailCall()) Out << " /*tail*/ ";
2528 // If this is an indirect call to a struct return function, we need to cast
2530 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2532 // GCC is a real PITA. It does not permit codegening casts of functions to
2533 // function pointers if they are in a call (it generates a trap instruction
2534 // instead!). We work around this by inserting a cast to void* in between
2535 // the function and the function pointer cast. Unfortunately, we can't just
2536 // form the constant expression here, because the folder will immediately
2539 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2540 // that void* and function pointers have the same size. :( To deal with this
2541 // in the common case, we handle casts where the number of arguments passed
2544 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2546 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2552 // Ok, just cast the pointer type.
2555 printType(Out, I.getCalledValue()->getType());
2557 printStructReturnPointerFunctionType(Out,
2558 cast<PointerType>(I.getCalledValue()->getType()));
2561 writeOperand(Callee);
2562 if (NeedsCast) Out << ')';
2567 unsigned NumDeclaredParams = FTy->getNumParams();
2569 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2571 if (isStructRet) { // Skip struct return argument.
2576 bool PrintedArg = false;
2578 for (; AI != AE; ++AI, ++ArgNo, ++Idx) {
2579 if (PrintedArg) Out << ", ";
2580 if (ArgNo < NumDeclaredParams &&
2581 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2583 printType(Out, FTy->getParamType(ArgNo),
2584 /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute));
2594 //This converts the llvm constraint string to something gcc is expecting.
2595 //TODO: work out platform independent constraints and factor those out
2596 // of the per target tables
2597 // handle multiple constraint codes
2598 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2600 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2602 const char** table = 0;
2604 //Grab the translation table from TargetAsmInfo if it exists
2607 const TargetMachineRegistry::Entry* Match =
2608 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2610 //Per platform Target Machines don't exist, so create it
2611 // this must be done only once
2612 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2613 TAsm = TM->getTargetAsmInfo();
2617 table = TAsm->getAsmCBE();
2619 //Search the translation table if it exists
2620 for (int i = 0; table && table[i]; i += 2)
2621 if (c.Codes[0] == table[i])
2624 //default is identity
2628 //TODO: import logic from AsmPrinter.cpp
2629 static std::string gccifyAsm(std::string asmstr) {
2630 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2631 if (asmstr[i] == '\n')
2632 asmstr.replace(i, 1, "\\n");
2633 else if (asmstr[i] == '\t')
2634 asmstr.replace(i, 1, "\\t");
2635 else if (asmstr[i] == '$') {
2636 if (asmstr[i + 1] == '{') {
2637 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2638 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2639 std::string n = "%" +
2640 asmstr.substr(a + 1, b - a - 1) +
2641 asmstr.substr(i + 2, a - i - 2);
2642 asmstr.replace(i, b - i + 1, n);
2645 asmstr.replace(i, 1, "%");
2647 else if (asmstr[i] == '%')//grr
2648 { asmstr.replace(i, 1, "%%"); ++i;}
2653 //TODO: assumptions about what consume arguments from the call are likely wrong
2654 // handle communitivity
2655 void CWriter::visitInlineAsm(CallInst &CI) {
2656 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2657 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2658 std::vector<std::pair<std::string, Value*> > Input;
2659 std::vector<std::pair<std::string, Value*> > Output;
2660 std::string Clobber;
2661 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2662 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2663 E = Constraints.end(); I != E; ++I) {
2664 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2666 InterpretASMConstraint(*I);
2669 assert(0 && "Unknown asm constraint");
2671 case InlineAsm::isInput: {
2673 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2674 ++count; //consume arg
2678 case InlineAsm::isOutput: {
2680 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2681 count ? CI.getOperand(count) : &CI));
2682 ++count; //consume arg
2686 case InlineAsm::isClobber: {
2688 Clobber += ",\"" + c + "\"";
2694 //fix up the asm string for gcc
2695 std::string asmstr = gccifyAsm(as->getAsmString());
2697 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2699 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2700 E = Output.end(); I != E; ++I) {
2701 Out << "\"" << I->first << "\"(";
2702 writeOperandRaw(I->second);
2708 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2709 E = Input.end(); I != E; ++I) {
2710 Out << "\"" << I->first << "\"(";
2711 writeOperandRaw(I->second);
2717 Out << "\n :" << Clobber.substr(1);
2721 void CWriter::visitMallocInst(MallocInst &I) {
2722 assert(0 && "lowerallocations pass didn't work!");
2725 void CWriter::visitAllocaInst(AllocaInst &I) {
2727 printType(Out, I.getType());
2728 Out << ") alloca(sizeof(";
2729 printType(Out, I.getType()->getElementType());
2731 if (I.isArrayAllocation()) {
2733 writeOperand(I.getOperand(0));
2738 void CWriter::visitFreeInst(FreeInst &I) {
2739 assert(0 && "lowerallocations pass didn't work!");
2742 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2743 gep_type_iterator E) {
2744 bool HasImplicitAddress = false;
2745 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2746 if (isa<GlobalValue>(Ptr)) {
2747 HasImplicitAddress = true;
2748 } else if (isDirectAlloca(Ptr)) {
2749 HasImplicitAddress = true;
2753 if (!HasImplicitAddress)
2754 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2756 writeOperandInternal(Ptr);
2760 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2761 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2764 writeOperandInternal(Ptr);
2766 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2768 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2771 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2772 "Can only have implicit address with direct accessing");
2774 if (HasImplicitAddress) {
2776 } else if (CI && CI->isNullValue()) {
2777 gep_type_iterator TmpI = I; ++TmpI;
2779 // Print out the -> operator if possible...
2780 if (TmpI != E && isa<StructType>(*TmpI)) {
2781 Out << (HasImplicitAddress ? "." : "->");
2782 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2788 if (isa<StructType>(*I)) {
2789 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2792 writeOperand(I.getOperand());
2797 void CWriter::visitLoadInst(LoadInst &I) {
2799 if (I.isVolatile()) {
2801 printType(Out, I.getType(), false, "volatile*");
2805 writeOperand(I.getOperand(0));
2811 void CWriter::visitStoreInst(StoreInst &I) {
2813 if (I.isVolatile()) {
2815 printType(Out, I.getOperand(0)->getType(), false, " volatile*");
2818 writeOperand(I.getPointerOperand());
2819 if (I.isVolatile()) Out << ')';
2821 Value *Operand = I.getOperand(0);
2822 Constant *BitMask = 0;
2823 if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
2824 if (!ITy->isPowerOf2ByteWidth())
2825 // We have a bit width that doesn't match an even power-of-2 byte
2826 // size. Consequently we must & the value with the type's bit mask
2827 BitMask = ConstantInt::get(ITy, ITy->getBitMask());
2830 writeOperand(Operand);
2833 printConstant(BitMask);
2838 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2840 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2844 void CWriter::visitVAArgInst(VAArgInst &I) {
2845 Out << "va_arg(*(va_list*)";
2846 writeOperand(I.getOperand(0));
2848 printType(Out, I.getType());
2852 //===----------------------------------------------------------------------===//
2853 // External Interface declaration
2854 //===----------------------------------------------------------------------===//
2856 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2858 CodeGenFileType FileType,
2860 if (FileType != TargetMachine::AssemblyFile) return true;
2862 PM.add(createLowerGCPass());
2863 PM.add(createLowerAllocationsPass(true));
2864 PM.add(createLowerInvokePass());
2865 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2866 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2867 PM.add(new CWriter(o));