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/SymbolTable.h"
24 #include "llvm/TypeSymbolTable.h"
25 #include "llvm/Intrinsics.h"
26 #include "llvm/IntrinsicInst.h"
27 #include "llvm/InlineAsm.h"
28 #include "llvm/Analysis/ConstantsScanner.h"
29 #include "llvm/Analysis/FindUsedTypes.h"
30 #include "llvm/Analysis/LoopInfo.h"
31 #include "llvm/CodeGen/IntrinsicLowering.h"
32 #include "llvm/Transforms/Scalar.h"
33 #include "llvm/Target/TargetMachineRegistry.h"
34 #include "llvm/Target/TargetAsmInfo.h"
35 #include "llvm/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> {
76 const Module *TheModule;
77 const TargetAsmInfo* TAsm;
78 std::map<const Type *, std::string> TypeNames;
80 std::map<const ConstantFP *, unsigned> FPConstantMap;
82 CWriter(std::ostream &o) : Out(o), TAsm(0) {}
84 virtual const char *getPassName() const { return "C backend"; }
86 void getAnalysisUsage(AnalysisUsage &AU) const {
87 AU.addRequired<LoopInfo>();
91 virtual bool doInitialization(Module &M);
93 bool runOnFunction(Function &F) {
94 LI = &getAnalysis<LoopInfo>();
96 // Get rid of intrinsics we can't handle.
99 // Output all floating point constants that cannot be printed accurately.
100 printFloatingPointConstants(F);
102 // Ensure that no local symbols conflict with global symbols.
103 F.renameLocalSymbols();
106 FPConstantMap.clear();
110 virtual bool doFinalization(Module &M) {
117 std::ostream &printType(std::ostream &Out, const Type *Ty,
118 bool isSigned = false,
119 const std::string &VariableName = "",
120 bool IgnoreName = false);
121 std::ostream &printSimpleType(std::ostream &Out, const Type *Ty,
123 const std::string &NameSoFar = "");
125 void printStructReturnPointerFunctionType(std::ostream &Out,
126 const PointerType *Ty);
128 void writeOperand(Value *Operand);
129 void writeOperandRaw(Value *Operand);
130 void writeOperandInternal(Value *Operand);
131 void writeOperandWithCast(Value* Operand, unsigned Opcode);
132 void writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate);
133 bool writeInstructionCast(const Instruction &I);
136 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
138 void lowerIntrinsics(Function &F);
140 void printModule(Module *M);
141 void printModuleTypes(const TypeSymbolTable &ST);
142 void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
143 void printFloatingPointConstants(Function &F);
144 void printFunctionSignature(const Function *F, bool Prototype);
146 void printFunction(Function &);
147 void printBasicBlock(BasicBlock *BB);
148 void printLoop(Loop *L);
150 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
151 void printConstant(Constant *CPV);
152 void printConstantWithCast(Constant *CPV, unsigned Opcode);
153 bool printConstExprCast(const ConstantExpr *CE);
154 void printConstantArray(ConstantArray *CPA);
155 void printConstantPacked(ConstantPacked *CP);
157 // isInlinableInst - Attempt to inline instructions into their uses to build
158 // trees as much as possible. To do this, we have to consistently decide
159 // what is acceptable to inline, so that variable declarations don't get
160 // printed and an extra copy of the expr is not emitted.
162 static bool isInlinableInst(const Instruction &I) {
163 // Always inline cmp instructions, even if they are shared by multiple
164 // expressions. GCC generates horrible code if we don't.
168 // Must be an expression, must be used exactly once. If it is dead, we
169 // emit it inline where it would go.
170 if (I.getType() == Type::VoidTy || !I.hasOneUse() ||
171 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
172 isa<LoadInst>(I) || isa<VAArgInst>(I))
173 // Don't inline a load across a store or other bad things!
176 // Must not be used in inline asm
177 if (I.hasOneUse() && isInlineAsm(*I.use_back())) return false;
179 // Only inline instruction it if it's use is in the same BB as the inst.
180 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
183 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
184 // variables which are accessed with the & operator. This causes GCC to
185 // generate significantly better code than to emit alloca calls directly.
187 static const AllocaInst *isDirectAlloca(const Value *V) {
188 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
189 if (!AI) return false;
190 if (AI->isArrayAllocation())
191 return 0; // FIXME: we can also inline fixed size array allocas!
192 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
197 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
198 static bool isInlineAsm(const Instruction& I) {
199 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
204 // Instruction visitation functions
205 friend class InstVisitor<CWriter>;
207 void visitReturnInst(ReturnInst &I);
208 void visitBranchInst(BranchInst &I);
209 void visitSwitchInst(SwitchInst &I);
210 void visitInvokeInst(InvokeInst &I) {
211 assert(0 && "Lowerinvoke pass didn't work!");
214 void visitUnwindInst(UnwindInst &I) {
215 assert(0 && "Lowerinvoke pass didn't work!");
217 void visitUnreachableInst(UnreachableInst &I);
219 void visitPHINode(PHINode &I);
220 void visitBinaryOperator(Instruction &I);
221 void visitICmpInst(ICmpInst &I);
222 void visitFCmpInst(FCmpInst &I);
224 void visitCastInst (CastInst &I);
225 void visitSelectInst(SelectInst &I);
226 void visitCallInst (CallInst &I);
227 void visitInlineAsm(CallInst &I);
228 void visitShiftInst(ShiftInst &I) { visitBinaryOperator(I); }
230 void visitMallocInst(MallocInst &I);
231 void visitAllocaInst(AllocaInst &I);
232 void visitFreeInst (FreeInst &I);
233 void visitLoadInst (LoadInst &I);
234 void visitStoreInst (StoreInst &I);
235 void visitGetElementPtrInst(GetElementPtrInst &I);
236 void visitVAArgInst (VAArgInst &I);
238 void visitInstruction(Instruction &I) {
239 cerr << "C Writer does not know about " << I;
243 void outputLValue(Instruction *I) {
244 Out << " " << Mang->getValueName(I) << " = ";
247 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
248 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
249 BasicBlock *Successor, unsigned Indent);
250 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
252 void printIndexingExpression(Value *Ptr, gep_type_iterator I,
253 gep_type_iterator E);
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)) {
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->isExternal() && 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->isExternal() && 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<PackedType>(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::PackedTyID: {
478 const PackedType *PTy = cast<PackedType>(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::printConstantPacked(ConstantPacked *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::PackedTyID:
932 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
933 const PackedType *AT = cast<PackedType>(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 printConstantPacked(cast<ConstantPacked>(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 void CWriter::writeOperandInternal(Value *Operand) {
1086 if (Instruction *I = dyn_cast<Instruction>(Operand))
1087 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1088 // Should we inline this instruction to build a tree?
1095 Constant* CPV = dyn_cast<Constant>(Operand);
1096 if (CPV && !isa<GlobalValue>(CPV)) {
1099 Out << Mang->getValueName(Operand);
1103 void CWriter::writeOperandRaw(Value *Operand) {
1104 Constant* CPV = dyn_cast<Constant>(Operand);
1105 if (CPV && !isa<GlobalValue>(CPV)) {
1108 Out << Mang->getValueName(Operand);
1112 void CWriter::writeOperand(Value *Operand) {
1113 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1114 Out << "(&"; // Global variables are referenced as their addresses by llvm
1116 writeOperandInternal(Operand);
1118 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1122 // Some instructions need to have their result value casted back to the
1123 // original types because their operands were casted to the expected type.
1124 // This function takes care of detecting that case and printing the cast
1125 // for the Instruction.
1126 bool CWriter::writeInstructionCast(const Instruction &I) {
1127 const Type *Ty = I.getOperand(0)->getType();
1128 switch (I.getOpcode()) {
1129 case Instruction::LShr:
1130 case Instruction::URem:
1131 case Instruction::UDiv:
1133 printSimpleType(Out, Ty, false);
1136 case Instruction::AShr:
1137 case Instruction::SRem:
1138 case Instruction::SDiv:
1140 printSimpleType(Out, Ty, true);
1148 // Write the operand with a cast to another type based on the Opcode being used.
1149 // This will be used in cases where an instruction has specific type
1150 // requirements (usually signedness) for its operands.
1151 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1153 // Extract the operand's type, we'll need it.
1154 const Type* OpTy = Operand->getType();
1156 // Indicate whether to do the cast or not.
1157 bool shouldCast = false;
1159 // Indicate whether the cast should be to a signed type or not.
1160 bool castIsSigned = false;
1162 // Based on the Opcode for which this Operand is being written, determine
1163 // the new type to which the operand should be casted by setting the value
1164 // of OpTy. If we change OpTy, also set shouldCast to true.
1167 // for most instructions, it doesn't matter
1169 case Instruction::LShr:
1170 case Instruction::UDiv:
1171 case Instruction::URem: // Cast to unsigned first
1173 castIsSigned = false;
1175 case Instruction::AShr:
1176 case Instruction::SDiv:
1177 case Instruction::SRem: // Cast to signed first
1179 castIsSigned = true;
1183 // Write out the casted operand if we should, otherwise just write the
1187 printSimpleType(Out, OpTy, castIsSigned);
1189 writeOperand(Operand);
1192 writeOperand(Operand);
1195 // Write the operand with a cast to another type based on the icmp predicate
1197 void CWriter::writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate) {
1199 // Extract the operand's type, we'll need it.
1200 const Type* OpTy = Operand->getType();
1202 // Indicate whether to do the cast or not.
1203 bool shouldCast = false;
1205 // Indicate whether the cast should be to a signed type or not.
1206 bool castIsSigned = false;
1208 // Based on the Opcode for which this Operand is being written, determine
1209 // the new type to which the operand should be casted by setting the value
1210 // of OpTy. If we change OpTy, also set shouldCast to true.
1211 switch (predicate) {
1213 // for eq and ne, it doesn't matter
1215 case ICmpInst::ICMP_UGT:
1216 case ICmpInst::ICMP_UGE:
1217 case ICmpInst::ICMP_ULT:
1218 case ICmpInst::ICMP_ULE:
1221 case ICmpInst::ICMP_SGT:
1222 case ICmpInst::ICMP_SGE:
1223 case ICmpInst::ICMP_SLT:
1224 case ICmpInst::ICMP_SLE:
1226 castIsSigned = true;
1230 // Write out the casted operand if we should, otherwise just write the
1234 if (OpTy->isInteger() && OpTy != Type::Int1Ty)
1235 printSimpleType(Out, OpTy, castIsSigned);
1237 printType(Out, OpTy); // not integer, sign doesn't matter
1239 writeOperand(Operand);
1242 writeOperand(Operand);
1245 // generateCompilerSpecificCode - This is where we add conditional compilation
1246 // directives to cater to specific compilers as need be.
1248 static void generateCompilerSpecificCode(std::ostream& Out) {
1249 // Alloca is hard to get, and we don't want to include stdlib.h here.
1250 Out << "/* get a declaration for alloca */\n"
1251 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1252 << "extern void *_alloca(unsigned long);\n"
1253 << "#define alloca(x) _alloca(x)\n"
1254 << "#elif defined(__APPLE__)\n"
1255 << "extern void *__builtin_alloca(unsigned long);\n"
1256 << "#define alloca(x) __builtin_alloca(x)\n"
1257 << "#define longjmp _longjmp\n"
1258 << "#define setjmp _setjmp\n"
1259 << "#elif defined(__sun__)\n"
1260 << "#if defined(__sparcv9)\n"
1261 << "extern void *__builtin_alloca(unsigned long);\n"
1263 << "extern void *__builtin_alloca(unsigned int);\n"
1265 << "#define alloca(x) __builtin_alloca(x)\n"
1266 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1267 << "#define alloca(x) __builtin_alloca(x)\n"
1268 << "#elif !defined(_MSC_VER)\n"
1269 << "#include <alloca.h>\n"
1272 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1273 // If we aren't being compiled with GCC, just drop these attributes.
1274 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1275 << "#define __attribute__(X)\n"
1278 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1279 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1280 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1281 << "#elif defined(__GNUC__)\n"
1282 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1284 << "#define __EXTERNAL_WEAK__\n"
1287 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1288 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1289 << "#define __ATTRIBUTE_WEAK__\n"
1290 << "#elif defined(__GNUC__)\n"
1291 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1293 << "#define __ATTRIBUTE_WEAK__\n"
1296 // Add hidden visibility support. FIXME: APPLE_CC?
1297 Out << "#if defined(__GNUC__)\n"
1298 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1301 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1302 // From the GCC documentation:
1304 // double __builtin_nan (const char *str)
1306 // This is an implementation of the ISO C99 function nan.
1308 // Since ISO C99 defines this function in terms of strtod, which we do
1309 // not implement, a description of the parsing is in order. The string is
1310 // parsed as by strtol; that is, the base is recognized by leading 0 or
1311 // 0x prefixes. The number parsed is placed in the significand such that
1312 // the least significant bit of the number is at the least significant
1313 // bit of the significand. The number is truncated to fit the significand
1314 // field provided. The significand is forced to be a quiet NaN.
1316 // This function, if given a string literal, is evaluated early enough
1317 // that it is considered a compile-time constant.
1319 // float __builtin_nanf (const char *str)
1321 // Similar to __builtin_nan, except the return type is float.
1323 // double __builtin_inf (void)
1325 // Similar to __builtin_huge_val, except a warning is generated if the
1326 // target floating-point format does not support infinities. This
1327 // function is suitable for implementing the ISO C99 macro INFINITY.
1329 // float __builtin_inff (void)
1331 // Similar to __builtin_inf, except the return type is float.
1332 Out << "#ifdef __GNUC__\n"
1333 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1334 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1335 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1336 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1337 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1338 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1339 << "#define LLVM_PREFETCH(addr,rw,locality) "
1340 "__builtin_prefetch(addr,rw,locality)\n"
1341 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1342 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1343 << "#define LLVM_ASM __asm__\n"
1345 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1346 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1347 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1348 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1349 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1350 << "#define LLVM_INFF 0.0F /* Float */\n"
1351 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1352 << "#define __ATTRIBUTE_CTOR__\n"
1353 << "#define __ATTRIBUTE_DTOR__\n"
1354 << "#define LLVM_ASM(X)\n"
1357 // Output target-specific code that should be inserted into main.
1358 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1359 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1360 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1361 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1362 << "defined(__x86_64__)\n"
1363 << "#undef CODE_FOR_MAIN\n"
1364 << "#define CODE_FOR_MAIN() \\\n"
1365 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1366 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1367 << "#endif\n#endif\n";
1371 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1372 /// the StaticTors set.
1373 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1374 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1375 if (!InitList) return;
1377 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1378 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1379 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1381 if (CS->getOperand(1)->isNullValue())
1382 return; // Found a null terminator, exit printing.
1383 Constant *FP = CS->getOperand(1);
1384 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1386 FP = CE->getOperand(0);
1387 if (Function *F = dyn_cast<Function>(FP))
1388 StaticTors.insert(F);
1392 enum SpecialGlobalClass {
1394 GlobalCtors, GlobalDtors,
1398 /// getGlobalVariableClass - If this is a global that is specially recognized
1399 /// by LLVM, return a code that indicates how we should handle it.
1400 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1401 // If this is a global ctors/dtors list, handle it now.
1402 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1403 if (GV->getName() == "llvm.global_ctors")
1405 else if (GV->getName() == "llvm.global_dtors")
1409 // Otherwise, it it is other metadata, don't print it. This catches things
1410 // like debug information.
1411 if (GV->getSection() == "llvm.metadata")
1418 bool CWriter::doInitialization(Module &M) {
1422 IL.AddPrototypes(M);
1424 // Ensure that all structure types have names...
1425 Mang = new Mangler(M);
1426 Mang->markCharUnacceptable('.');
1428 // Keep track of which functions are static ctors/dtors so they can have
1429 // an attribute added to their prototypes.
1430 std::set<Function*> StaticCtors, StaticDtors;
1431 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1433 switch (getGlobalVariableClass(I)) {
1436 FindStaticTors(I, StaticCtors);
1439 FindStaticTors(I, StaticDtors);
1444 // get declaration for alloca
1445 Out << "/* Provide Declarations */\n";
1446 Out << "#include <stdarg.h>\n"; // Varargs support
1447 Out << "#include <setjmp.h>\n"; // Unwind support
1448 generateCompilerSpecificCode(Out);
1450 // Provide a definition for `bool' if not compiling with a C++ compiler.
1452 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1454 << "\n\n/* Support for floating point constants */\n"
1455 << "typedef unsigned long long ConstantDoubleTy;\n"
1456 << "typedef unsigned int ConstantFloatTy;\n"
1458 << "\n\n/* Global Declarations */\n";
1460 // First output all the declarations for the program, because C requires
1461 // Functions & globals to be declared before they are used.
1464 // Loop over the symbol table, emitting all named constants...
1465 printModuleTypes(M.getTypeSymbolTable());
1467 // Global variable declarations...
1468 if (!M.global_empty()) {
1469 Out << "\n/* External Global Variable Declarations */\n";
1470 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1472 if (I->hasExternalLinkage()) {
1474 printType(Out, I->getType()->getElementType(), false,
1475 Mang->getValueName(I));
1477 } else if (I->hasDLLImportLinkage()) {
1478 Out << "__declspec(dllimport) ";
1479 printType(Out, I->getType()->getElementType(), false,
1480 Mang->getValueName(I));
1482 } else if (I->hasExternalWeakLinkage()) {
1484 printType(Out, I->getType()->getElementType(), false,
1485 Mang->getValueName(I));
1486 Out << " __EXTERNAL_WEAK__ ;\n";
1491 // Function declarations
1492 Out << "\n/* Function Declarations */\n";
1493 Out << "double fmod(double, double);\n"; // Support for FP rem
1494 Out << "float fmodf(float, float);\n";
1496 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1497 // Don't print declarations for intrinsic functions.
1498 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1499 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1500 if (I->hasExternalWeakLinkage())
1502 printFunctionSignature(I, true);
1503 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1504 Out << " __ATTRIBUTE_WEAK__";
1505 if (I->hasExternalWeakLinkage())
1506 Out << " __EXTERNAL_WEAK__";
1507 if (StaticCtors.count(I))
1508 Out << " __ATTRIBUTE_CTOR__";
1509 if (StaticDtors.count(I))
1510 Out << " __ATTRIBUTE_DTOR__";
1511 if (I->hasHiddenVisibility())
1512 Out << " __HIDDEN__";
1514 if (I->hasName() && I->getName()[0] == 1)
1515 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1521 // Output the global variable declarations
1522 if (!M.global_empty()) {
1523 Out << "\n\n/* Global Variable Declarations */\n";
1524 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1526 if (!I->isExternal()) {
1527 // Ignore special globals, such as debug info.
1528 if (getGlobalVariableClass(I))
1531 if (I->hasInternalLinkage())
1535 printType(Out, I->getType()->getElementType(), false,
1536 Mang->getValueName(I));
1538 if (I->hasLinkOnceLinkage())
1539 Out << " __attribute__((common))";
1540 else if (I->hasWeakLinkage())
1541 Out << " __ATTRIBUTE_WEAK__";
1542 else if (I->hasExternalWeakLinkage())
1543 Out << " __EXTERNAL_WEAK__";
1544 if (I->hasHiddenVisibility())
1545 Out << " __HIDDEN__";
1550 // Output the global variable definitions and contents...
1551 if (!M.global_empty()) {
1552 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1553 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1555 if (!I->isExternal()) {
1556 // Ignore special globals, such as debug info.
1557 if (getGlobalVariableClass(I))
1560 if (I->hasInternalLinkage())
1562 else if (I->hasDLLImportLinkage())
1563 Out << "__declspec(dllimport) ";
1564 else if (I->hasDLLExportLinkage())
1565 Out << "__declspec(dllexport) ";
1567 printType(Out, I->getType()->getElementType(), false,
1568 Mang->getValueName(I));
1569 if (I->hasLinkOnceLinkage())
1570 Out << " __attribute__((common))";
1571 else if (I->hasWeakLinkage())
1572 Out << " __ATTRIBUTE_WEAK__";
1574 if (I->hasHiddenVisibility())
1575 Out << " __HIDDEN__";
1577 // If the initializer is not null, emit the initializer. If it is null,
1578 // we try to avoid emitting large amounts of zeros. The problem with
1579 // this, however, occurs when the variable has weak linkage. In this
1580 // case, the assembler will complain about the variable being both weak
1581 // and common, so we disable this optimization.
1582 if (!I->getInitializer()->isNullValue()) {
1584 writeOperand(I->getInitializer());
1585 } else if (I->hasWeakLinkage()) {
1586 // We have to specify an initializer, but it doesn't have to be
1587 // complete. If the value is an aggregate, print out { 0 }, and let
1588 // the compiler figure out the rest of the zeros.
1590 if (isa<StructType>(I->getInitializer()->getType()) ||
1591 isa<ArrayType>(I->getInitializer()->getType()) ||
1592 isa<PackedType>(I->getInitializer()->getType())) {
1595 // Just print it out normally.
1596 writeOperand(I->getInitializer());
1604 Out << "\n\n/* Function Bodies */\n";
1606 // Emit some helper functions for dealing with FCMP instruction's
1608 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1609 Out << "return X == X && Y == Y; }\n";
1610 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1611 Out << "return X != X || Y != Y; }\n";
1612 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1613 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1614 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1615 Out << "return X != Y; }\n";
1616 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1617 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1618 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1619 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1620 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1621 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1622 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1623 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1624 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1625 Out << "return X == Y ; }\n";
1626 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1627 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1628 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1629 Out << "return X < Y ; }\n";
1630 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1631 Out << "return X > Y ; }\n";
1632 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1633 Out << "return X <= Y ; }\n";
1634 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1635 Out << "return X >= Y ; }\n";
1640 /// Output all floating point constants that cannot be printed accurately...
1641 void CWriter::printFloatingPointConstants(Function &F) {
1642 // Scan the module for floating point constants. If any FP constant is used
1643 // in the function, we want to redirect it here so that we do not depend on
1644 // the precision of the printed form, unless the printed form preserves
1647 static unsigned FPCounter = 0;
1648 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1650 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1651 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1652 !FPConstantMap.count(FPC)) {
1653 double Val = FPC->getValue();
1655 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1657 if (FPC->getType() == Type::DoubleTy) {
1658 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1659 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1660 << "ULL; /* " << Val << " */\n";
1661 } else if (FPC->getType() == Type::FloatTy) {
1662 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1663 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1664 << "U; /* " << Val << " */\n";
1666 assert(0 && "Unknown float type!");
1673 /// printSymbolTable - Run through symbol table looking for type names. If a
1674 /// type name is found, emit its declaration...
1676 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1677 Out << "/* Helper union for bitcasts */\n";
1678 Out << "typedef union {\n";
1679 Out << " unsigned int Int32;\n";
1680 Out << " unsigned long long Int64;\n";
1681 Out << " float Float;\n";
1682 Out << " double Double;\n";
1683 Out << "} llvmBitCastUnion;\n";
1685 // We are only interested in the type plane of the symbol table.
1686 TypeSymbolTable::const_iterator I = TST.begin();
1687 TypeSymbolTable::const_iterator End = TST.end();
1689 // If there are no type names, exit early.
1690 if (I == End) return;
1692 // Print out forward declarations for structure types before anything else!
1693 Out << "/* Structure forward decls */\n";
1694 for (; I != End; ++I)
1695 if (const Type *STy = dyn_cast<StructType>(I->second)) {
1696 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1697 Out << Name << ";\n";
1698 TypeNames.insert(std::make_pair(STy, Name));
1703 // Now we can print out typedefs. Above, we guaranteed that this can only be
1704 // for struct types.
1705 Out << "/* Typedefs */\n";
1706 for (I = TST.begin(); I != End; ++I) {
1707 const StructType *Ty = cast<StructType>(I->second);
1708 std::string Name = "l_" + Mang->makeNameProper(I->first);
1710 printType(Out, Ty, false, Name);
1716 // Keep track of which structures have been printed so far...
1717 std::set<const StructType *> StructPrinted;
1719 // Loop over all structures then push them into the stack so they are
1720 // printed in the correct order.
1722 Out << "/* Structure contents */\n";
1723 for (I = TST.begin(); I != End; ++I)
1724 if (const StructType *STy = dyn_cast<StructType>(I->second))
1725 // Only print out used types!
1726 printContainedStructs(STy, StructPrinted);
1729 // Push the struct onto the stack and recursively push all structs
1730 // this one depends on.
1732 // TODO: Make this work properly with packed types
1734 void CWriter::printContainedStructs(const Type *Ty,
1735 std::set<const StructType*> &StructPrinted){
1736 // Don't walk through pointers.
1737 if (isa<PointerType>(Ty) || Ty->isPrimitiveType() || Ty->isInteger()) return;
1739 // Print all contained types first.
1740 for (Type::subtype_iterator I = Ty->subtype_begin(),
1741 E = Ty->subtype_end(); I != E; ++I)
1742 printContainedStructs(*I, StructPrinted);
1744 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1745 // Check to see if we have already printed this struct.
1746 if (StructPrinted.insert(STy).second) {
1747 // Print structure type out.
1748 std::string Name = TypeNames[STy];
1749 printType(Out, STy, false, Name, true);
1755 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1756 /// isCStructReturn - Should this function actually return a struct by-value?
1757 bool isCStructReturn = F->getCallingConv() == CallingConv::CSRet;
1759 if (F->hasInternalLinkage()) Out << "static ";
1760 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1761 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1762 switch (F->getCallingConv()) {
1763 case CallingConv::X86_StdCall:
1764 Out << "__stdcall ";
1766 case CallingConv::X86_FastCall:
1767 Out << "__fastcall ";
1771 // Loop over the arguments, printing them...
1772 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1774 std::stringstream FunctionInnards;
1776 // Print out the name...
1777 FunctionInnards << Mang->getValueName(F) << '(';
1779 bool PrintedArg = false;
1780 if (!F->isExternal()) {
1781 if (!F->arg_empty()) {
1782 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1784 // If this is a struct-return function, don't print the hidden
1785 // struct-return argument.
1786 if (isCStructReturn) {
1787 assert(I != E && "Invalid struct return function!");
1791 std::string ArgName;
1793 for (; I != E; ++I) {
1794 if (PrintedArg) FunctionInnards << ", ";
1795 if (I->hasName() || !Prototype)
1796 ArgName = Mang->getValueName(I);
1799 printType(FunctionInnards, I->getType(),
1800 /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute),
1807 // Loop over the arguments, printing them.
1808 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1810 // If this is a struct-return function, don't print the hidden
1811 // struct-return argument.
1812 if (isCStructReturn) {
1813 assert(I != E && "Invalid struct return function!");
1818 for (; I != E; ++I) {
1819 if (PrintedArg) FunctionInnards << ", ";
1820 printType(FunctionInnards, *I,
1821 /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute));
1827 // Finish printing arguments... if this is a vararg function, print the ...,
1828 // unless there are no known types, in which case, we just emit ().
1830 if (FT->isVarArg() && PrintedArg) {
1831 if (PrintedArg) FunctionInnards << ", ";
1832 FunctionInnards << "..."; // Output varargs portion of signature!
1833 } else if (!FT->isVarArg() && !PrintedArg) {
1834 FunctionInnards << "void"; // ret() -> ret(void) in C.
1836 FunctionInnards << ')';
1838 // Get the return tpe for the function.
1840 if (!isCStructReturn)
1841 RetTy = F->getReturnType();
1843 // If this is a struct-return function, print the struct-return type.
1844 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1847 // Print out the return type and the signature built above.
1848 printType(Out, RetTy,
1849 /*isSigned=*/FT->paramHasAttr(0, FunctionType::SExtAttribute),
1850 FunctionInnards.str());
1853 static inline bool isFPIntBitCast(const Instruction &I) {
1854 if (!isa<BitCastInst>(I))
1856 const Type *SrcTy = I.getOperand(0)->getType();
1857 const Type *DstTy = I.getType();
1858 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1859 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1862 void CWriter::printFunction(Function &F) {
1863 printFunctionSignature(&F, false);
1866 // If this is a struct return function, handle the result with magic.
1867 if (F.getCallingConv() == CallingConv::CSRet) {
1868 const Type *StructTy =
1869 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1871 printType(Out, StructTy, false, "StructReturn");
1872 Out << "; /* Struct return temporary */\n";
1875 printType(Out, F.arg_begin()->getType(), false,
1876 Mang->getValueName(F.arg_begin()));
1877 Out << " = &StructReturn;\n";
1880 bool PrintedVar = false;
1882 // print local variable information for the function
1883 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1884 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1886 printType(Out, AI->getAllocatedType(), false, Mang->getValueName(AI));
1887 Out << "; /* Address-exposed local */\n";
1889 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1891 printType(Out, I->getType(), false, Mang->getValueName(&*I));
1894 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1896 printType(Out, I->getType(), false,
1897 Mang->getValueName(&*I)+"__PHI_TEMPORARY");
1902 // We need a temporary for the BitCast to use so it can pluck a value out
1903 // of a union to do the BitCast. This is separate from the need for a
1904 // variable to hold the result of the BitCast.
1905 if (isFPIntBitCast(*I)) {
1906 Out << " llvmBitCastUnion " << Mang->getValueName(&*I)
1907 << "__BITCAST_TEMPORARY;\n";
1915 if (F.hasExternalLinkage() && F.getName() == "main")
1916 Out << " CODE_FOR_MAIN();\n";
1918 // print the basic blocks
1919 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1920 if (Loop *L = LI->getLoopFor(BB)) {
1921 if (L->getHeader() == BB && L->getParentLoop() == 0)
1924 printBasicBlock(BB);
1931 void CWriter::printLoop(Loop *L) {
1932 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1933 << "' to make GCC happy */\n";
1934 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1935 BasicBlock *BB = L->getBlocks()[i];
1936 Loop *BBLoop = LI->getLoopFor(BB);
1938 printBasicBlock(BB);
1939 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
1942 Out << " } while (1); /* end of syntactic loop '"
1943 << L->getHeader()->getName() << "' */\n";
1946 void CWriter::printBasicBlock(BasicBlock *BB) {
1948 // Don't print the label for the basic block if there are no uses, or if
1949 // the only terminator use is the predecessor basic block's terminator.
1950 // We have to scan the use list because PHI nodes use basic blocks too but
1951 // do not require a label to be generated.
1953 bool NeedsLabel = false;
1954 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
1955 if (isGotoCodeNecessary(*PI, BB)) {
1960 if (NeedsLabel) Out << Mang->getValueName(BB) << ":\n";
1962 // Output all of the instructions in the basic block...
1963 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
1965 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
1966 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
1975 // Don't emit prefix or suffix for the terminator...
1976 visit(*BB->getTerminator());
1980 // Specific Instruction type classes... note that all of the casts are
1981 // necessary because we use the instruction classes as opaque types...
1983 void CWriter::visitReturnInst(ReturnInst &I) {
1984 // If this is a struct return function, return the temporary struct.
1985 if (I.getParent()->getParent()->getCallingConv() == CallingConv::CSRet) {
1986 Out << " return StructReturn;\n";
1990 // Don't output a void return if this is the last basic block in the function
1991 if (I.getNumOperands() == 0 &&
1992 &*--I.getParent()->getParent()->end() == I.getParent() &&
1993 !I.getParent()->size() == 1) {
1998 if (I.getNumOperands()) {
2000 writeOperand(I.getOperand(0));
2005 void CWriter::visitSwitchInst(SwitchInst &SI) {
2008 writeOperand(SI.getOperand(0));
2009 Out << ") {\n default:\n";
2010 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2011 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2013 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2015 writeOperand(SI.getOperand(i));
2017 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2018 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2019 printBranchToBlock(SI.getParent(), Succ, 2);
2020 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
2026 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2027 Out << " /*UNREACHABLE*/;\n";
2030 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2031 /// FIXME: This should be reenabled, but loop reordering safe!!
2034 if (next(Function::iterator(From)) != Function::iterator(To))
2035 return true; // Not the direct successor, we need a goto.
2037 //isa<SwitchInst>(From->getTerminator())
2039 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2044 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2045 BasicBlock *Successor,
2047 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2048 PHINode *PN = cast<PHINode>(I);
2049 // Now we have to do the printing.
2050 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2051 if (!isa<UndefValue>(IV)) {
2052 Out << std::string(Indent, ' ');
2053 Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = ";
2055 Out << "; /* for PHI node */\n";
2060 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2062 if (isGotoCodeNecessary(CurBB, Succ)) {
2063 Out << std::string(Indent, ' ') << " goto ";
2069 // Branch instruction printing - Avoid printing out a branch to a basic block
2070 // that immediately succeeds the current one.
2072 void CWriter::visitBranchInst(BranchInst &I) {
2074 if (I.isConditional()) {
2075 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2077 writeOperand(I.getCondition());
2080 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2081 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2083 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2084 Out << " } else {\n";
2085 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2086 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2089 // First goto not necessary, assume second one is...
2091 writeOperand(I.getCondition());
2094 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2095 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2100 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2101 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2106 // PHI nodes get copied into temporary values at the end of predecessor basic
2107 // blocks. We now need to copy these temporary values into the REAL value for
2109 void CWriter::visitPHINode(PHINode &I) {
2111 Out << "__PHI_TEMPORARY";
2115 void CWriter::visitBinaryOperator(Instruction &I) {
2116 // binary instructions, shift instructions, setCond instructions.
2117 assert(!isa<PointerType>(I.getType()));
2119 // We must cast the results of binary operations which might be promoted.
2120 bool needsCast = false;
2121 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2122 || (I.getType() == Type::FloatTy)) {
2125 printType(Out, I.getType(), false);
2129 // If this is a negation operation, print it out as such. For FP, we don't
2130 // want to print "-0.0 - X".
2131 if (BinaryOperator::isNeg(&I)) {
2133 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2135 } else if (I.getOpcode() == Instruction::FRem) {
2136 // Output a call to fmod/fmodf instead of emitting a%b
2137 if (I.getType() == Type::FloatTy)
2141 writeOperand(I.getOperand(0));
2143 writeOperand(I.getOperand(1));
2147 // Write out the cast of the instruction's value back to the proper type
2149 bool NeedsClosingParens = writeInstructionCast(I);
2151 // Certain instructions require the operand to be forced to a specific type
2152 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2153 // below for operand 1
2154 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2156 switch (I.getOpcode()) {
2157 case Instruction::Add: Out << " + "; break;
2158 case Instruction::Sub: Out << " - "; break;
2159 case Instruction::Mul: Out << '*'; break;
2160 case Instruction::URem:
2161 case Instruction::SRem:
2162 case Instruction::FRem: Out << '%'; break;
2163 case Instruction::UDiv:
2164 case Instruction::SDiv:
2165 case Instruction::FDiv: Out << '/'; break;
2166 case Instruction::And: Out << " & "; break;
2167 case Instruction::Or: Out << " | "; break;
2168 case Instruction::Xor: Out << " ^ "; break;
2169 case Instruction::Shl : Out << " << "; break;
2170 case Instruction::LShr:
2171 case Instruction::AShr: Out << " >> "; break;
2172 default: cerr << "Invalid operator type!" << I; abort();
2175 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2176 if (NeedsClosingParens)
2185 void CWriter::visitICmpInst(ICmpInst &I) {
2186 // We must cast the results of icmp which might be promoted.
2187 bool needsCast = false;
2189 // Write out the cast of the instruction's value back to the proper type
2191 bool NeedsClosingParens = writeInstructionCast(I);
2193 // Certain icmp predicate require the operand to be forced to a specific type
2194 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2195 // below for operand 1
2196 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2198 switch (I.getPredicate()) {
2199 case ICmpInst::ICMP_EQ: Out << " == "; break;
2200 case ICmpInst::ICMP_NE: Out << " != "; break;
2201 case ICmpInst::ICMP_ULE:
2202 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2203 case ICmpInst::ICMP_UGE:
2204 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2205 case ICmpInst::ICMP_ULT:
2206 case ICmpInst::ICMP_SLT: Out << " < "; break;
2207 case ICmpInst::ICMP_UGT:
2208 case ICmpInst::ICMP_SGT: Out << " > "; break;
2209 default: cerr << "Invalid icmp predicate!" << I; abort();
2212 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2213 if (NeedsClosingParens)
2221 void CWriter::visitFCmpInst(FCmpInst &I) {
2222 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2226 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2232 switch (I.getPredicate()) {
2233 default: assert(0 && "Illegal FCmp predicate");
2234 case FCmpInst::FCMP_ORD: op = "ord"; break;
2235 case FCmpInst::FCMP_UNO: op = "uno"; break;
2236 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2237 case FCmpInst::FCMP_UNE: op = "une"; break;
2238 case FCmpInst::FCMP_ULT: op = "ult"; break;
2239 case FCmpInst::FCMP_ULE: op = "ule"; break;
2240 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2241 case FCmpInst::FCMP_UGE: op = "uge"; break;
2242 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2243 case FCmpInst::FCMP_ONE: op = "one"; break;
2244 case FCmpInst::FCMP_OLT: op = "olt"; break;
2245 case FCmpInst::FCMP_OLE: op = "ole"; break;
2246 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2247 case FCmpInst::FCMP_OGE: op = "oge"; break;
2250 Out << "llvm_fcmp_" << op << "(";
2251 // Write the first operand
2252 writeOperand(I.getOperand(0));
2254 // Write the second operand
2255 writeOperand(I.getOperand(1));
2259 static const char * getFloatBitCastField(const Type *Ty) {
2260 switch (Ty->getTypeID()) {
2261 default: assert(0 && "Invalid Type");
2262 case Type::FloatTyID: return "Float";
2263 case Type::DoubleTyID: return "Double";
2264 case Type::IntegerTyID: {
2265 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2274 void CWriter::visitCastInst(CastInst &I) {
2275 const Type *DstTy = I.getType();
2276 const Type *SrcTy = I.getOperand(0)->getType();
2278 if (isFPIntBitCast(I)) {
2279 // These int<->float and long<->double casts need to be handled specially
2280 Out << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2281 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2282 writeOperand(I.getOperand(0));
2283 Out << ", " << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2284 << getFloatBitCastField(I.getType());
2286 printCast(I.getOpcode(), SrcTy, DstTy);
2287 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::Int1Ty) {
2288 // Make sure we really get a sext from bool by subtracing the bool from 0
2291 writeOperand(I.getOperand(0));
2292 if (DstTy == Type::Int1Ty &&
2293 (I.getOpcode() == Instruction::Trunc ||
2294 I.getOpcode() == Instruction::FPToUI ||
2295 I.getOpcode() == Instruction::FPToSI ||
2296 I.getOpcode() == Instruction::PtrToInt)) {
2297 // Make sure we really get a trunc to bool by anding the operand with 1
2304 void CWriter::visitSelectInst(SelectInst &I) {
2306 writeOperand(I.getCondition());
2308 writeOperand(I.getTrueValue());
2310 writeOperand(I.getFalseValue());
2315 void CWriter::lowerIntrinsics(Function &F) {
2316 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2317 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2318 if (CallInst *CI = dyn_cast<CallInst>(I++))
2319 if (Function *F = CI->getCalledFunction())
2320 switch (F->getIntrinsicID()) {
2321 case Intrinsic::not_intrinsic:
2322 case Intrinsic::vastart:
2323 case Intrinsic::vacopy:
2324 case Intrinsic::vaend:
2325 case Intrinsic::returnaddress:
2326 case Intrinsic::frameaddress:
2327 case Intrinsic::setjmp:
2328 case Intrinsic::longjmp:
2329 case Intrinsic::prefetch:
2330 case Intrinsic::dbg_stoppoint:
2331 case Intrinsic::powi_f32:
2332 case Intrinsic::powi_f64:
2333 // We directly implement these intrinsics
2336 // If this is an intrinsic that directly corresponds to a GCC
2337 // builtin, we handle it.
2338 const char *BuiltinName = "";
2339 #define GET_GCC_BUILTIN_NAME
2340 #include "llvm/Intrinsics.gen"
2341 #undef GET_GCC_BUILTIN_NAME
2342 // If we handle it, don't lower it.
2343 if (BuiltinName[0]) break;
2345 // All other intrinsic calls we must lower.
2346 Instruction *Before = 0;
2347 if (CI != &BB->front())
2348 Before = prior(BasicBlock::iterator(CI));
2350 IL.LowerIntrinsicCall(CI);
2351 if (Before) { // Move iterator to instruction after call
2362 void CWriter::visitCallInst(CallInst &I) {
2363 //check if we have inline asm
2364 if (isInlineAsm(I)) {
2369 bool WroteCallee = false;
2371 // Handle intrinsic function calls first...
2372 if (Function *F = I.getCalledFunction())
2373 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2376 // If this is an intrinsic that directly corresponds to a GCC
2377 // builtin, we emit it here.
2378 const char *BuiltinName = "";
2379 #define GET_GCC_BUILTIN_NAME
2380 #include "llvm/Intrinsics.gen"
2381 #undef GET_GCC_BUILTIN_NAME
2382 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2388 case Intrinsic::vastart:
2391 Out << "va_start(*(va_list*)";
2392 writeOperand(I.getOperand(1));
2394 // Output the last argument to the enclosing function...
2395 if (I.getParent()->getParent()->arg_empty()) {
2396 cerr << "The C backend does not currently support zero "
2397 << "argument varargs functions, such as '"
2398 << I.getParent()->getParent()->getName() << "'!\n";
2401 writeOperand(--I.getParent()->getParent()->arg_end());
2404 case Intrinsic::vaend:
2405 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2406 Out << "0; va_end(*(va_list*)";
2407 writeOperand(I.getOperand(1));
2410 Out << "va_end(*(va_list*)0)";
2413 case Intrinsic::vacopy:
2415 Out << "va_copy(*(va_list*)";
2416 writeOperand(I.getOperand(1));
2417 Out << ", *(va_list*)";
2418 writeOperand(I.getOperand(2));
2421 case Intrinsic::returnaddress:
2422 Out << "__builtin_return_address(";
2423 writeOperand(I.getOperand(1));
2426 case Intrinsic::frameaddress:
2427 Out << "__builtin_frame_address(";
2428 writeOperand(I.getOperand(1));
2431 case Intrinsic::powi_f32:
2432 case Intrinsic::powi_f64:
2433 Out << "__builtin_powi(";
2434 writeOperand(I.getOperand(1));
2436 writeOperand(I.getOperand(2));
2439 case Intrinsic::setjmp:
2440 Out << "setjmp(*(jmp_buf*)";
2441 writeOperand(I.getOperand(1));
2444 case Intrinsic::longjmp:
2445 Out << "longjmp(*(jmp_buf*)";
2446 writeOperand(I.getOperand(1));
2448 writeOperand(I.getOperand(2));
2451 case Intrinsic::prefetch:
2452 Out << "LLVM_PREFETCH((const void *)";
2453 writeOperand(I.getOperand(1));
2455 writeOperand(I.getOperand(2));
2457 writeOperand(I.getOperand(3));
2460 case Intrinsic::dbg_stoppoint: {
2461 // If we use writeOperand directly we get a "u" suffix which is rejected
2463 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2467 << " \"" << SPI.getDirectory()
2468 << SPI.getFileName() << "\"\n";
2474 Value *Callee = I.getCalledValue();
2476 // If this is a call to a struct-return function, assign to the first
2477 // parameter instead of passing it to the call.
2478 bool isStructRet = I.getCallingConv() == CallingConv::CSRet;
2481 writeOperand(I.getOperand(1));
2485 if (I.isTailCall()) Out << " /*tail*/ ";
2487 const PointerType *PTy = cast<PointerType>(Callee->getType());
2488 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2491 // If this is an indirect call to a struct return function, we need to cast
2493 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2495 // GCC is a real PITA. It does not permit codegening casts of functions to
2496 // function pointers if they are in a call (it generates a trap instruction
2497 // instead!). We work around this by inserting a cast to void* in between
2498 // the function and the function pointer cast. Unfortunately, we can't just
2499 // form the constant expression here, because the folder will immediately
2502 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2503 // that void* and function pointers have the same size. :( To deal with this
2504 // in the common case, we handle casts where the number of arguments passed
2507 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2509 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2515 // Ok, just cast the pointer type.
2518 printType(Out, I.getCalledValue()->getType());
2520 printStructReturnPointerFunctionType(Out,
2521 cast<PointerType>(I.getCalledValue()->getType()));
2524 writeOperand(Callee);
2525 if (NeedsCast) Out << ')';
2530 unsigned NumDeclaredParams = FTy->getNumParams();
2532 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2534 if (isStructRet) { // Skip struct return argument.
2539 bool PrintedArg = false;
2541 for (; AI != AE; ++AI, ++ArgNo, ++Idx) {
2542 if (PrintedArg) Out << ", ";
2543 if (ArgNo < NumDeclaredParams &&
2544 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2546 printType(Out, FTy->getParamType(ArgNo),
2547 /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute));
2557 //This converts the llvm constraint string to something gcc is expecting.
2558 //TODO: work out platform independent constraints and factor those out
2559 // of the per target tables
2560 // handle multiple constraint codes
2561 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2563 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2565 const char** table = 0;
2567 //Grab the translation table from TargetAsmInfo if it exists
2570 const TargetMachineRegistry::Entry* Match =
2571 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2573 //Per platform Target Machines don't exist, so create it
2574 // this must be done only once
2575 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2576 TAsm = TM->getTargetAsmInfo();
2580 table = TAsm->getAsmCBE();
2582 //Search the translation table if it exists
2583 for (int i = 0; table && table[i]; i += 2)
2584 if (c.Codes[0] == table[i])
2587 //default is identity
2591 //TODO: import logic from AsmPrinter.cpp
2592 static std::string gccifyAsm(std::string asmstr) {
2593 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2594 if (asmstr[i] == '\n')
2595 asmstr.replace(i, 1, "\\n");
2596 else if (asmstr[i] == '\t')
2597 asmstr.replace(i, 1, "\\t");
2598 else if (asmstr[i] == '$') {
2599 if (asmstr[i + 1] == '{') {
2600 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2601 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2602 std::string n = "%" +
2603 asmstr.substr(a + 1, b - a - 1) +
2604 asmstr.substr(i + 2, a - i - 2);
2605 asmstr.replace(i, b - i + 1, n);
2608 asmstr.replace(i, 1, "%");
2610 else if (asmstr[i] == '%')//grr
2611 { asmstr.replace(i, 1, "%%"); ++i;}
2616 //TODO: assumptions about what consume arguments from the call are likely wrong
2617 // handle communitivity
2618 void CWriter::visitInlineAsm(CallInst &CI) {
2619 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2620 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2621 std::vector<std::pair<std::string, Value*> > Input;
2622 std::vector<std::pair<std::string, Value*> > Output;
2623 std::string Clobber;
2624 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2625 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2626 E = Constraints.end(); I != E; ++I) {
2627 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2629 InterpretASMConstraint(*I);
2632 assert(0 && "Unknown asm constraint");
2634 case InlineAsm::isInput: {
2636 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2637 ++count; //consume arg
2641 case InlineAsm::isOutput: {
2643 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2644 count ? CI.getOperand(count) : &CI));
2645 ++count; //consume arg
2649 case InlineAsm::isClobber: {
2651 Clobber += ",\"" + c + "\"";
2657 //fix up the asm string for gcc
2658 std::string asmstr = gccifyAsm(as->getAsmString());
2660 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2662 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2663 E = Output.end(); I != E; ++I) {
2664 Out << "\"" << I->first << "\"(";
2665 writeOperandRaw(I->second);
2671 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2672 E = Input.end(); I != E; ++I) {
2673 Out << "\"" << I->first << "\"(";
2674 writeOperandRaw(I->second);
2680 Out << "\n :" << Clobber.substr(1);
2684 void CWriter::visitMallocInst(MallocInst &I) {
2685 assert(0 && "lowerallocations pass didn't work!");
2688 void CWriter::visitAllocaInst(AllocaInst &I) {
2690 printType(Out, I.getType());
2691 Out << ") alloca(sizeof(";
2692 printType(Out, I.getType()->getElementType());
2694 if (I.isArrayAllocation()) {
2696 writeOperand(I.getOperand(0));
2701 void CWriter::visitFreeInst(FreeInst &I) {
2702 assert(0 && "lowerallocations pass didn't work!");
2705 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2706 gep_type_iterator E) {
2707 bool HasImplicitAddress = false;
2708 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2709 if (isa<GlobalValue>(Ptr)) {
2710 HasImplicitAddress = true;
2711 } else if (isDirectAlloca(Ptr)) {
2712 HasImplicitAddress = true;
2716 if (!HasImplicitAddress)
2717 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2719 writeOperandInternal(Ptr);
2723 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2724 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2727 writeOperandInternal(Ptr);
2729 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2731 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2734 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2735 "Can only have implicit address with direct accessing");
2737 if (HasImplicitAddress) {
2739 } else if (CI && CI->isNullValue()) {
2740 gep_type_iterator TmpI = I; ++TmpI;
2742 // Print out the -> operator if possible...
2743 if (TmpI != E && isa<StructType>(*TmpI)) {
2744 Out << (HasImplicitAddress ? "." : "->");
2745 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2751 if (isa<StructType>(*I)) {
2752 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2755 writeOperand(I.getOperand());
2760 void CWriter::visitLoadInst(LoadInst &I) {
2762 if (I.isVolatile()) {
2764 printType(Out, I.getType(), false, "volatile*");
2768 writeOperand(I.getOperand(0));
2774 void CWriter::visitStoreInst(StoreInst &I) {
2776 if (I.isVolatile()) {
2778 printType(Out, I.getOperand(0)->getType(), false, " volatile*");
2781 writeOperand(I.getPointerOperand());
2782 if (I.isVolatile()) Out << ')';
2784 writeOperand(I.getOperand(0));
2787 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2789 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2793 void CWriter::visitVAArgInst(VAArgInst &I) {
2794 Out << "va_arg(*(va_list*)";
2795 writeOperand(I.getOperand(0));
2797 printType(Out, I.getType());
2801 //===----------------------------------------------------------------------===//
2802 // External Interface declaration
2803 //===----------------------------------------------------------------------===//
2805 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2807 CodeGenFileType FileType,
2809 if (FileType != TargetMachine::AssemblyFile) return true;
2811 PM.add(createLowerGCPass());
2812 PM.add(createLowerAllocationsPass(true));
2813 PM.add(createLowerInvokePass());
2814 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2815 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2816 PM.add(new CWriter(o));