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 is not used, remove it from the symbol table.
274 std::set<const Type *>::iterator UTI = UT.find(I->second);
278 UT.erase(UTI); // Only keep one name for this type.
281 // UT now contains types that are not named. Loop over it, naming
284 bool Changed = false;
285 unsigned RenameCounter = 0;
286 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
288 if (const StructType *ST = dyn_cast<StructType>(*I)) {
289 while (M.addTypeName("unnamed"+utostr(RenameCounter), ST))
295 // Loop over all external functions and globals. If we have two with
296 // identical names, merge them.
297 // FIXME: This code should disappear when we don't allow values with the same
298 // names when they have different types!
299 std::map<std::string, GlobalValue*> ExtSymbols;
300 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
302 if (GV->isExternal() && GV->hasName()) {
303 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
304 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
306 // Found a conflict, replace this global with the previous one.
307 GlobalValue *OldGV = X.first->second;
308 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
309 GV->eraseFromParent();
314 // Do the same for globals.
315 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
317 GlobalVariable *GV = I++;
318 if (GV->isExternal() && GV->hasName()) {
319 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
320 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
322 // Found a conflict, replace this global with the previous one.
323 GlobalValue *OldGV = X.first->second;
324 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
325 GV->eraseFromParent();
334 /// printStructReturnPointerFunctionType - This is like printType for a struct
335 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
336 /// print it as "Struct (*)(...)", for struct return functions.
337 void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
338 const PointerType *TheTy) {
339 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
340 std::stringstream FunctionInnards;
341 FunctionInnards << " (*) (";
342 bool PrintedType = false;
344 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
345 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
347 for (++I; I != E; ++I) {
349 FunctionInnards << ", ";
350 printType(FunctionInnards, *I,
351 /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute), "");
354 if (FTy->isVarArg()) {
356 FunctionInnards << ", ...";
357 } else if (!PrintedType) {
358 FunctionInnards << "void";
360 FunctionInnards << ')';
361 std::string tstr = FunctionInnards.str();
362 printType(Out, RetTy,
363 /*isSigned=*/FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
367 CWriter::printSimpleType(std::ostream &Out, const Type *Ty, bool isSigned,
368 const std::string &NameSoFar) {
369 assert((Ty->isPrimitiveType() || Ty->isInteger()) &&
370 "Invalid type for printSimpleType");
371 switch (Ty->getTypeID()) {
372 case Type::VoidTyID: return Out << "void " << NameSoFar;
373 case Type::IntegerTyID: {
374 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
376 return Out << "bool " << NameSoFar;
377 else if (NumBits <= 8)
378 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
379 else if (NumBits <= 16)
380 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
381 else if (NumBits <= 32)
382 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
384 assert(NumBits <= 64 && "Bit widths > 64 not implemented yet");
385 return Out << (isSigned?"signed":"unsigned") << " long long "<< NameSoFar;
388 case Type::FloatTyID: return Out << "float " << NameSoFar;
389 case Type::DoubleTyID: return Out << "double " << NameSoFar;
391 cerr << "Unknown primitive type: " << *Ty << "\n";
396 // Pass the Type* and the variable name and this prints out the variable
399 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
400 bool isSigned, const std::string &NameSoFar,
402 if (Ty->isPrimitiveType() || Ty->isInteger()) {
403 printSimpleType(Out, Ty, isSigned, NameSoFar);
407 // Check to see if the type is named.
408 if (!IgnoreName || isa<OpaqueType>(Ty)) {
409 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
410 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
413 switch (Ty->getTypeID()) {
414 case Type::FunctionTyID: {
415 const FunctionType *FTy = cast<FunctionType>(Ty);
416 std::stringstream FunctionInnards;
417 FunctionInnards << " (" << NameSoFar << ") (";
419 for (FunctionType::param_iterator I = FTy->param_begin(),
420 E = FTy->param_end(); I != E; ++I) {
421 if (I != FTy->param_begin())
422 FunctionInnards << ", ";
423 printType(FunctionInnards, *I,
424 /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute), "");
427 if (FTy->isVarArg()) {
428 if (FTy->getNumParams())
429 FunctionInnards << ", ...";
430 } else if (!FTy->getNumParams()) {
431 FunctionInnards << "void";
433 FunctionInnards << ')';
434 std::string tstr = FunctionInnards.str();
435 printType(Out, FTy->getReturnType(),
436 /*isSigned=*/FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
439 case Type::StructTyID: {
440 const StructType *STy = cast<StructType>(Ty);
441 Out << NameSoFar + " {\n";
443 for (StructType::element_iterator I = STy->element_begin(),
444 E = STy->element_end(); I != E; ++I) {
446 printType(Out, *I, false, "field" + utostr(Idx++));
452 case Type::PointerTyID: {
453 const PointerType *PTy = cast<PointerType>(Ty);
454 std::string ptrName = "*" + NameSoFar;
456 if (isa<ArrayType>(PTy->getElementType()) ||
457 isa<PackedType>(PTy->getElementType()))
458 ptrName = "(" + ptrName + ")";
460 return printType(Out, PTy->getElementType(), false, ptrName);
463 case Type::ArrayTyID: {
464 const ArrayType *ATy = cast<ArrayType>(Ty);
465 unsigned NumElements = ATy->getNumElements();
466 if (NumElements == 0) NumElements = 1;
467 return printType(Out, ATy->getElementType(), false,
468 NameSoFar + "[" + utostr(NumElements) + "]");
471 case Type::PackedTyID: {
472 const PackedType *PTy = cast<PackedType>(Ty);
473 unsigned NumElements = PTy->getNumElements();
474 if (NumElements == 0) NumElements = 1;
475 return printType(Out, PTy->getElementType(), false,
476 NameSoFar + "[" + utostr(NumElements) + "]");
479 case Type::OpaqueTyID: {
480 static int Count = 0;
481 std::string TyName = "struct opaque_" + itostr(Count++);
482 assert(TypeNames.find(Ty) == TypeNames.end());
483 TypeNames[Ty] = TyName;
484 return Out << TyName << ' ' << NameSoFar;
487 assert(0 && "Unhandled case in getTypeProps!");
494 void CWriter::printConstantArray(ConstantArray *CPA) {
496 // As a special case, print the array as a string if it is an array of
497 // ubytes or an array of sbytes with positive values.
499 const Type *ETy = CPA->getType()->getElementType();
500 bool isString = (ETy == Type::Int8Ty || ETy == Type::Int8Ty);
502 // Make sure the last character is a null char, as automatically added by C
503 if (isString && (CPA->getNumOperands() == 0 ||
504 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
509 // Keep track of whether the last number was a hexadecimal escape
510 bool LastWasHex = false;
512 // Do not include the last character, which we know is null
513 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
514 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
516 // Print it out literally if it is a printable character. The only thing
517 // to be careful about is when the last letter output was a hex escape
518 // code, in which case we have to be careful not to print out hex digits
519 // explicitly (the C compiler thinks it is a continuation of the previous
520 // character, sheesh...)
522 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
524 if (C == '"' || C == '\\')
531 case '\n': Out << "\\n"; break;
532 case '\t': Out << "\\t"; break;
533 case '\r': Out << "\\r"; break;
534 case '\v': Out << "\\v"; break;
535 case '\a': Out << "\\a"; break;
536 case '\"': Out << "\\\""; break;
537 case '\'': Out << "\\\'"; break;
540 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
541 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
550 if (CPA->getNumOperands()) {
552 printConstant(cast<Constant>(CPA->getOperand(0)));
553 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
555 printConstant(cast<Constant>(CPA->getOperand(i)));
562 void CWriter::printConstantPacked(ConstantPacked *CP) {
564 if (CP->getNumOperands()) {
566 printConstant(cast<Constant>(CP->getOperand(0)));
567 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
569 printConstant(cast<Constant>(CP->getOperand(i)));
575 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
576 // textually as a double (rather than as a reference to a stack-allocated
577 // variable). We decide this by converting CFP to a string and back into a
578 // double, and then checking whether the conversion results in a bit-equal
579 // double to the original value of CFP. This depends on us and the target C
580 // compiler agreeing on the conversion process (which is pretty likely since we
581 // only deal in IEEE FP).
583 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
584 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
586 sprintf(Buffer, "%a", CFP->getValue());
588 if (!strncmp(Buffer, "0x", 2) ||
589 !strncmp(Buffer, "-0x", 3) ||
590 !strncmp(Buffer, "+0x", 3))
591 return atof(Buffer) == CFP->getValue();
594 std::string StrVal = ftostr(CFP->getValue());
596 while (StrVal[0] == ' ')
597 StrVal.erase(StrVal.begin());
599 // Check to make sure that the stringized number is not some string like "Inf"
600 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
601 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
602 ((StrVal[0] == '-' || StrVal[0] == '+') &&
603 (StrVal[1] >= '0' && StrVal[1] <= '9')))
604 // Reparse stringized version!
605 return atof(StrVal.c_str()) == CFP->getValue();
610 /// Print out the casting for a cast operation. This does the double casting
611 /// necessary for conversion to the destination type, if necessary.
612 /// @brief Print a cast
613 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
614 // Print the destination type cast
616 case Instruction::UIToFP:
617 case Instruction::SIToFP:
618 case Instruction::IntToPtr:
619 case Instruction::Trunc:
620 case Instruction::BitCast:
621 case Instruction::FPExt:
622 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
624 printType(Out, DstTy);
627 case Instruction::ZExt:
628 case Instruction::PtrToInt:
629 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
631 printSimpleType(Out, DstTy, false);
634 case Instruction::SExt:
635 case Instruction::FPToSI: // For these, make sure we get a signed dest
637 printSimpleType(Out, DstTy, true);
641 assert(0 && "Invalid cast opcode");
644 // Print the source type cast
646 case Instruction::UIToFP:
647 case Instruction::ZExt:
649 printSimpleType(Out, SrcTy, false);
652 case Instruction::SIToFP:
653 case Instruction::SExt:
655 printSimpleType(Out, SrcTy, true);
658 case Instruction::IntToPtr:
659 case Instruction::PtrToInt:
660 // Avoid "cast to pointer from integer of different size" warnings
661 Out << "(unsigned long)";
663 case Instruction::Trunc:
664 case Instruction::BitCast:
665 case Instruction::FPExt:
666 case Instruction::FPTrunc:
667 case Instruction::FPToSI:
668 case Instruction::FPToUI:
669 break; // These don't need a source cast.
671 assert(0 && "Invalid cast opcode");
676 // printConstant - The LLVM Constant to C Constant converter.
677 void CWriter::printConstant(Constant *CPV) {
678 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
679 switch (CE->getOpcode()) {
680 case Instruction::Trunc:
681 case Instruction::ZExt:
682 case Instruction::SExt:
683 case Instruction::FPTrunc:
684 case Instruction::FPExt:
685 case Instruction::UIToFP:
686 case Instruction::SIToFP:
687 case Instruction::FPToUI:
688 case Instruction::FPToSI:
689 case Instruction::PtrToInt:
690 case Instruction::IntToPtr:
691 case Instruction::BitCast:
693 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
694 if (CE->getOpcode() == Instruction::SExt &&
695 CE->getOperand(0)->getType() == Type::Int1Ty) {
696 // Make sure we really sext from bool here by subtracting from 0
699 printConstant(CE->getOperand(0));
700 if (CE->getType() == Type::Int1Ty &&
701 (CE->getOpcode() == Instruction::Trunc ||
702 CE->getOpcode() == Instruction::FPToUI ||
703 CE->getOpcode() == Instruction::FPToSI ||
704 CE->getOpcode() == Instruction::PtrToInt)) {
705 // Make sure we really truncate to bool here by anding with 1
711 case Instruction::GetElementPtr:
713 printIndexingExpression(CE->getOperand(0), gep_type_begin(CPV),
717 case Instruction::Select:
719 printConstant(CE->getOperand(0));
721 printConstant(CE->getOperand(1));
723 printConstant(CE->getOperand(2));
726 case Instruction::Add:
727 case Instruction::Sub:
728 case Instruction::Mul:
729 case Instruction::SDiv:
730 case Instruction::UDiv:
731 case Instruction::FDiv:
732 case Instruction::URem:
733 case Instruction::SRem:
734 case Instruction::FRem:
735 case Instruction::And:
736 case Instruction::Or:
737 case Instruction::Xor:
738 case Instruction::ICmp:
739 case Instruction::Shl:
740 case Instruction::LShr:
741 case Instruction::AShr:
744 bool NeedsClosingParens = printConstExprCast(CE);
745 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
746 switch (CE->getOpcode()) {
747 case Instruction::Add: Out << " + "; break;
748 case Instruction::Sub: Out << " - "; break;
749 case Instruction::Mul: Out << " * "; break;
750 case Instruction::URem:
751 case Instruction::SRem:
752 case Instruction::FRem: Out << " % "; break;
753 case Instruction::UDiv:
754 case Instruction::SDiv:
755 case Instruction::FDiv: Out << " / "; break;
756 case Instruction::And: Out << " & "; break;
757 case Instruction::Or: Out << " | "; break;
758 case Instruction::Xor: Out << " ^ "; break;
759 case Instruction::Shl: Out << " << "; break;
760 case Instruction::LShr:
761 case Instruction::AShr: Out << " >> "; break;
762 case Instruction::ICmp:
763 switch (CE->getPredicate()) {
764 case ICmpInst::ICMP_EQ: Out << " == "; break;
765 case ICmpInst::ICMP_NE: Out << " != "; break;
766 case ICmpInst::ICMP_SLT:
767 case ICmpInst::ICMP_ULT: Out << " < "; break;
768 case ICmpInst::ICMP_SLE:
769 case ICmpInst::ICMP_ULE: Out << " <= "; break;
770 case ICmpInst::ICMP_SGT:
771 case ICmpInst::ICMP_UGT: Out << " > "; break;
772 case ICmpInst::ICMP_SGE:
773 case ICmpInst::ICMP_UGE: Out << " >= "; break;
774 default: assert(0 && "Illegal ICmp predicate");
777 default: assert(0 && "Illegal opcode here!");
779 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
780 if (NeedsClosingParens)
785 case Instruction::FCmp: {
787 bool NeedsClosingParens = printConstExprCast(CE);
788 if (CE->getPredicate() == FCmpInst::FCMP_FALSE)
790 else if (CE->getPredicate() == FCmpInst::FCMP_TRUE)
794 switch (CE->getPredicate()) {
795 default: assert(0 && "Illegal FCmp predicate");
796 case FCmpInst::FCMP_ORD: op = "ord"; break;
797 case FCmpInst::FCMP_UNO: op = "uno"; break;
798 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
799 case FCmpInst::FCMP_UNE: op = "une"; break;
800 case FCmpInst::FCMP_ULT: op = "ult"; break;
801 case FCmpInst::FCMP_ULE: op = "ule"; break;
802 case FCmpInst::FCMP_UGT: op = "ugt"; break;
803 case FCmpInst::FCMP_UGE: op = "uge"; break;
804 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
805 case FCmpInst::FCMP_ONE: op = "one"; break;
806 case FCmpInst::FCMP_OLT: op = "olt"; break;
807 case FCmpInst::FCMP_OLE: op = "ole"; break;
808 case FCmpInst::FCMP_OGT: op = "ogt"; break;
809 case FCmpInst::FCMP_OGE: op = "oge"; break;
811 Out << "llvm_fcmp_" << op << "(";
812 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
814 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
817 if (NeedsClosingParens)
822 cerr << "CWriter Error: Unhandled constant expression: "
826 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
828 printType(Out, CPV->getType()); // sign doesn't matter
829 Out << ")/*UNDEF*/0)";
833 if (ConstantInt *CI = dyn_cast<ConstantInt>(CPV)) {
834 const Type* Ty = CI->getType();
835 if (Ty == Type::Int1Ty)
836 Out << (CI->getZExtValue() ? '1' : '0') ;
839 printSimpleType(Out, Ty, false) << ')';
840 if (CI->isMinValue(true))
841 Out << CI->getZExtValue() << 'u';
843 Out << CI->getSExtValue();
844 if (Ty->getPrimitiveSizeInBits() > 32)
851 switch (CPV->getType()->getTypeID()) {
852 case Type::FloatTyID:
853 case Type::DoubleTyID: {
854 ConstantFP *FPC = cast<ConstantFP>(CPV);
855 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
856 if (I != FPConstantMap.end()) {
857 // Because of FP precision problems we must load from a stack allocated
858 // value that holds the value in hex.
859 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
860 << "*)&FPConstant" << I->second << ')';
862 if (IsNAN(FPC->getValue())) {
865 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
867 const unsigned long QuietNaN = 0x7ff8UL;
868 //const unsigned long SignalNaN = 0x7ff4UL;
870 // We need to grab the first part of the FP #
873 uint64_t ll = DoubleToBits(FPC->getValue());
874 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
876 std::string Num(&Buffer[0], &Buffer[6]);
877 unsigned long Val = strtoul(Num.c_str(), 0, 16);
879 if (FPC->getType() == Type::FloatTy)
880 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
881 << Buffer << "\") /*nan*/ ";
883 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
884 << Buffer << "\") /*nan*/ ";
885 } else if (IsInf(FPC->getValue())) {
887 if (FPC->getValue() < 0) Out << '-';
888 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
892 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
893 // Print out the constant as a floating point number.
895 sprintf(Buffer, "%a", FPC->getValue());
898 Num = ftostr(FPC->getValue());
906 case Type::ArrayTyID:
907 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
908 const ArrayType *AT = cast<ArrayType>(CPV->getType());
910 if (AT->getNumElements()) {
912 Constant *CZ = Constant::getNullValue(AT->getElementType());
914 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
921 printConstantArray(cast<ConstantArray>(CPV));
925 case Type::PackedTyID:
926 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
927 const PackedType *AT = cast<PackedType>(CPV->getType());
929 if (AT->getNumElements()) {
931 Constant *CZ = Constant::getNullValue(AT->getElementType());
933 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
940 printConstantPacked(cast<ConstantPacked>(CPV));
944 case Type::StructTyID:
945 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
946 const StructType *ST = cast<StructType>(CPV->getType());
948 if (ST->getNumElements()) {
950 printConstant(Constant::getNullValue(ST->getElementType(0)));
951 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
953 printConstant(Constant::getNullValue(ST->getElementType(i)));
959 if (CPV->getNumOperands()) {
961 printConstant(cast<Constant>(CPV->getOperand(0)));
962 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
964 printConstant(cast<Constant>(CPV->getOperand(i)));
971 case Type::PointerTyID:
972 if (isa<ConstantPointerNull>(CPV)) {
974 printType(Out, CPV->getType()); // sign doesn't matter
975 Out << ")/*NULL*/0)";
977 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
983 cerr << "Unknown constant type: " << *CPV << "\n";
988 // Some constant expressions need to be casted back to the original types
989 // because their operands were casted to the expected type. This function takes
990 // care of detecting that case and printing the cast for the ConstantExpr.
991 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
992 bool NeedsExplicitCast = false;
993 const Type *Ty = CE->getOperand(0)->getType();
994 bool TypeIsSigned = false;
995 switch (CE->getOpcode()) {
996 case Instruction::LShr:
997 case Instruction::URem:
998 case Instruction::UDiv: NeedsExplicitCast = true; break;
999 case Instruction::AShr:
1000 case Instruction::SRem:
1001 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1002 case Instruction::SExt:
1004 NeedsExplicitCast = true;
1005 TypeIsSigned = true;
1007 case Instruction::ZExt:
1008 case Instruction::Trunc:
1009 case Instruction::FPTrunc:
1010 case Instruction::FPExt:
1011 case Instruction::UIToFP:
1012 case Instruction::SIToFP:
1013 case Instruction::FPToUI:
1014 case Instruction::FPToSI:
1015 case Instruction::PtrToInt:
1016 case Instruction::IntToPtr:
1017 case Instruction::BitCast:
1019 NeedsExplicitCast = true;
1023 if (NeedsExplicitCast) {
1025 if (Ty->isInteger() && Ty != Type::Int1Ty)
1026 printSimpleType(Out, Ty, TypeIsSigned);
1028 printType(Out, Ty); // not integer, sign doesn't matter
1031 return NeedsExplicitCast;
1034 // Print a constant assuming that it is the operand for a given Opcode. The
1035 // opcodes that care about sign need to cast their operands to the expected
1036 // type before the operation proceeds. This function does the casting.
1037 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1039 // Extract the operand's type, we'll need it.
1040 const Type* OpTy = CPV->getType();
1042 // Indicate whether to do the cast or not.
1043 bool shouldCast = false;
1044 bool typeIsSigned = false;
1046 // Based on the Opcode for which this Constant is being written, determine
1047 // the new type to which the operand should be casted by setting the value
1048 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1052 // for most instructions, it doesn't matter
1054 case Instruction::LShr:
1055 case Instruction::UDiv:
1056 case Instruction::URem:
1059 case Instruction::AShr:
1060 case Instruction::SDiv:
1061 case Instruction::SRem:
1063 typeIsSigned = true;
1067 // Write out the casted constant if we should, otherwise just write the
1071 printSimpleType(Out, OpTy, typeIsSigned);
1079 void CWriter::writeOperandInternal(Value *Operand) {
1080 if (Instruction *I = dyn_cast<Instruction>(Operand))
1081 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1082 // Should we inline this instruction to build a tree?
1089 Constant* CPV = dyn_cast<Constant>(Operand);
1090 if (CPV && !isa<GlobalValue>(CPV)) {
1093 Out << Mang->getValueName(Operand);
1097 void CWriter::writeOperandRaw(Value *Operand) {
1098 Constant* CPV = dyn_cast<Constant>(Operand);
1099 if (CPV && !isa<GlobalValue>(CPV)) {
1102 Out << Mang->getValueName(Operand);
1106 void CWriter::writeOperand(Value *Operand) {
1107 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1108 Out << "(&"; // Global variables are referenced as their addresses by llvm
1110 writeOperandInternal(Operand);
1112 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1116 // Some instructions need to have their result value casted back to the
1117 // original types because their operands were casted to the expected type.
1118 // This function takes care of detecting that case and printing the cast
1119 // for the Instruction.
1120 bool CWriter::writeInstructionCast(const Instruction &I) {
1121 const Type *Ty = I.getOperand(0)->getType();
1122 switch (I.getOpcode()) {
1123 case Instruction::LShr:
1124 case Instruction::URem:
1125 case Instruction::UDiv:
1127 printSimpleType(Out, Ty, false);
1130 case Instruction::AShr:
1131 case Instruction::SRem:
1132 case Instruction::SDiv:
1134 printSimpleType(Out, Ty, true);
1142 // Write the operand with a cast to another type based on the Opcode being used.
1143 // This will be used in cases where an instruction has specific type
1144 // requirements (usually signedness) for its operands.
1145 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1147 // Extract the operand's type, we'll need it.
1148 const Type* OpTy = Operand->getType();
1150 // Indicate whether to do the cast or not.
1151 bool shouldCast = false;
1153 // Indicate whether the cast should be to a signed type or not.
1154 bool castIsSigned = false;
1156 // Based on the Opcode for which this Operand is being written, determine
1157 // the new type to which the operand should be casted by setting the value
1158 // of OpTy. If we change OpTy, also set shouldCast to true.
1161 // for most instructions, it doesn't matter
1163 case Instruction::LShr:
1164 case Instruction::UDiv:
1165 case Instruction::URem: // Cast to unsigned first
1167 castIsSigned = false;
1169 case Instruction::AShr:
1170 case Instruction::SDiv:
1171 case Instruction::SRem: // Cast to signed first
1173 castIsSigned = true;
1177 // Write out the casted operand if we should, otherwise just write the
1181 printSimpleType(Out, OpTy, castIsSigned);
1183 writeOperand(Operand);
1186 writeOperand(Operand);
1189 // Write the operand with a cast to another type based on the icmp predicate
1191 void CWriter::writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate) {
1193 // Extract the operand's type, we'll need it.
1194 const Type* OpTy = Operand->getType();
1196 // Indicate whether to do the cast or not.
1197 bool shouldCast = false;
1199 // Indicate whether the cast should be to a signed type or not.
1200 bool castIsSigned = false;
1202 // Based on the Opcode for which this Operand is being written, determine
1203 // the new type to which the operand should be casted by setting the value
1204 // of OpTy. If we change OpTy, also set shouldCast to true.
1205 switch (predicate) {
1207 // for eq and ne, it doesn't matter
1209 case ICmpInst::ICMP_UGT:
1210 case ICmpInst::ICMP_UGE:
1211 case ICmpInst::ICMP_ULT:
1212 case ICmpInst::ICMP_ULE:
1215 case ICmpInst::ICMP_SGT:
1216 case ICmpInst::ICMP_SGE:
1217 case ICmpInst::ICMP_SLT:
1218 case ICmpInst::ICMP_SLE:
1220 castIsSigned = true;
1224 // Write out the casted operand if we should, otherwise just write the
1228 if (OpTy->isInteger() && OpTy != Type::Int1Ty)
1229 printSimpleType(Out, OpTy, castIsSigned);
1231 printType(Out, OpTy); // not integer, sign doesn't matter
1233 writeOperand(Operand);
1236 writeOperand(Operand);
1239 // generateCompilerSpecificCode - This is where we add conditional compilation
1240 // directives to cater to specific compilers as need be.
1242 static void generateCompilerSpecificCode(std::ostream& Out) {
1243 // Alloca is hard to get, and we don't want to include stdlib.h here.
1244 Out << "/* get a declaration for alloca */\n"
1245 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1246 << "extern void *_alloca(unsigned long);\n"
1247 << "#define alloca(x) _alloca(x)\n"
1248 << "#elif defined(__APPLE__)\n"
1249 << "extern void *__builtin_alloca(unsigned long);\n"
1250 << "#define alloca(x) __builtin_alloca(x)\n"
1251 << "#define longjmp _longjmp\n"
1252 << "#define setjmp _setjmp\n"
1253 << "#elif defined(__sun__)\n"
1254 << "#if defined(__sparcv9)\n"
1255 << "extern void *__builtin_alloca(unsigned long);\n"
1257 << "extern void *__builtin_alloca(unsigned int);\n"
1259 << "#define alloca(x) __builtin_alloca(x)\n"
1260 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1261 << "#define alloca(x) __builtin_alloca(x)\n"
1262 << "#elif !defined(_MSC_VER)\n"
1263 << "#include <alloca.h>\n"
1266 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1267 // If we aren't being compiled with GCC, just drop these attributes.
1268 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1269 << "#define __attribute__(X)\n"
1272 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1273 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1274 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1275 << "#elif defined(__GNUC__)\n"
1276 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1278 << "#define __EXTERNAL_WEAK__\n"
1281 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1282 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1283 << "#define __ATTRIBUTE_WEAK__\n"
1284 << "#elif defined(__GNUC__)\n"
1285 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1287 << "#define __ATTRIBUTE_WEAK__\n"
1290 // Add hidden visibility support. FIXME: APPLE_CC?
1291 Out << "#if defined(__GNUC__)\n"
1292 << "#define __HIDDEN__ __attribute__((visibility(\"hidden\")))\n"
1295 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1296 // From the GCC documentation:
1298 // double __builtin_nan (const char *str)
1300 // This is an implementation of the ISO C99 function nan.
1302 // Since ISO C99 defines this function in terms of strtod, which we do
1303 // not implement, a description of the parsing is in order. The string is
1304 // parsed as by strtol; that is, the base is recognized by leading 0 or
1305 // 0x prefixes. The number parsed is placed in the significand such that
1306 // the least significant bit of the number is at the least significant
1307 // bit of the significand. The number is truncated to fit the significand
1308 // field provided. The significand is forced to be a quiet NaN.
1310 // This function, if given a string literal, is evaluated early enough
1311 // that it is considered a compile-time constant.
1313 // float __builtin_nanf (const char *str)
1315 // Similar to __builtin_nan, except the return type is float.
1317 // double __builtin_inf (void)
1319 // Similar to __builtin_huge_val, except a warning is generated if the
1320 // target floating-point format does not support infinities. This
1321 // function is suitable for implementing the ISO C99 macro INFINITY.
1323 // float __builtin_inff (void)
1325 // Similar to __builtin_inf, except the return type is float.
1326 Out << "#ifdef __GNUC__\n"
1327 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1328 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1329 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1330 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1331 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1332 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1333 << "#define LLVM_PREFETCH(addr,rw,locality) "
1334 "__builtin_prefetch(addr,rw,locality)\n"
1335 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1336 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1337 << "#define LLVM_ASM __asm__\n"
1339 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1340 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1341 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1342 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1343 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1344 << "#define LLVM_INFF 0.0F /* Float */\n"
1345 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1346 << "#define __ATTRIBUTE_CTOR__\n"
1347 << "#define __ATTRIBUTE_DTOR__\n"
1348 << "#define LLVM_ASM(X)\n"
1351 // Output target-specific code that should be inserted into main.
1352 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1353 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1354 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1355 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1356 << "defined(__x86_64__)\n"
1357 << "#undef CODE_FOR_MAIN\n"
1358 << "#define CODE_FOR_MAIN() \\\n"
1359 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1360 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1361 << "#endif\n#endif\n";
1365 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1366 /// the StaticTors set.
1367 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1368 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1369 if (!InitList) return;
1371 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1372 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1373 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1375 if (CS->getOperand(1)->isNullValue())
1376 return; // Found a null terminator, exit printing.
1377 Constant *FP = CS->getOperand(1);
1378 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1380 FP = CE->getOperand(0);
1381 if (Function *F = dyn_cast<Function>(FP))
1382 StaticTors.insert(F);
1386 enum SpecialGlobalClass {
1388 GlobalCtors, GlobalDtors,
1392 /// getGlobalVariableClass - If this is a global that is specially recognized
1393 /// by LLVM, return a code that indicates how we should handle it.
1394 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1395 // If this is a global ctors/dtors list, handle it now.
1396 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1397 if (GV->getName() == "llvm.global_ctors")
1399 else if (GV->getName() == "llvm.global_dtors")
1403 // Otherwise, it it is other metadata, don't print it. This catches things
1404 // like debug information.
1405 if (GV->getSection() == "llvm.metadata")
1412 bool CWriter::doInitialization(Module &M) {
1416 IL.AddPrototypes(M);
1418 // Ensure that all structure types have names...
1419 Mang = new Mangler(M);
1420 Mang->markCharUnacceptable('.');
1422 // Keep track of which functions are static ctors/dtors so they can have
1423 // an attribute added to their prototypes.
1424 std::set<Function*> StaticCtors, StaticDtors;
1425 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1427 switch (getGlobalVariableClass(I)) {
1430 FindStaticTors(I, StaticCtors);
1433 FindStaticTors(I, StaticDtors);
1438 // get declaration for alloca
1439 Out << "/* Provide Declarations */\n";
1440 Out << "#include <stdarg.h>\n"; // Varargs support
1441 Out << "#include <setjmp.h>\n"; // Unwind support
1442 generateCompilerSpecificCode(Out);
1444 // Provide a definition for `bool' if not compiling with a C++ compiler.
1446 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1448 << "\n\n/* Support for floating point constants */\n"
1449 << "typedef unsigned long long ConstantDoubleTy;\n"
1450 << "typedef unsigned int ConstantFloatTy;\n"
1452 << "\n\n/* Global Declarations */\n";
1454 // First output all the declarations for the program, because C requires
1455 // Functions & globals to be declared before they are used.
1458 // Loop over the symbol table, emitting all named constants...
1459 printModuleTypes(M.getTypeSymbolTable());
1461 // Global variable declarations...
1462 if (!M.global_empty()) {
1463 Out << "\n/* External Global Variable Declarations */\n";
1464 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1466 if (I->hasExternalLinkage()) {
1468 printType(Out, I->getType()->getElementType(), false,
1469 Mang->getValueName(I));
1471 } else if (I->hasDLLImportLinkage()) {
1472 Out << "__declspec(dllimport) ";
1473 printType(Out, I->getType()->getElementType(), false,
1474 Mang->getValueName(I));
1476 } else if (I->hasExternalWeakLinkage()) {
1478 printType(Out, I->getType()->getElementType(), false,
1479 Mang->getValueName(I));
1480 Out << " __EXTERNAL_WEAK__ ;\n";
1485 // Function declarations
1486 Out << "\n/* Function Declarations */\n";
1487 Out << "double fmod(double, double);\n"; // Support for FP rem
1488 Out << "float fmodf(float, float);\n";
1490 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1491 // Don't print declarations for intrinsic functions.
1492 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1493 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1494 if (I->hasExternalWeakLinkage())
1496 printFunctionSignature(I, true);
1497 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1498 Out << " __ATTRIBUTE_WEAK__";
1499 if (I->hasExternalWeakLinkage())
1500 Out << " __EXTERNAL_WEAK__";
1501 if (StaticCtors.count(I))
1502 Out << " __ATTRIBUTE_CTOR__";
1503 if (StaticDtors.count(I))
1504 Out << " __ATTRIBUTE_DTOR__";
1505 if (I->hasHiddenVisibility())
1506 Out << " __HIDDEN__";
1508 if (I->hasName() && I->getName()[0] == 1)
1509 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1515 // Output the global variable declarations
1516 if (!M.global_empty()) {
1517 Out << "\n\n/* Global Variable Declarations */\n";
1518 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1520 if (!I->isExternal()) {
1521 // Ignore special globals, such as debug info.
1522 if (getGlobalVariableClass(I))
1525 if (I->hasInternalLinkage())
1529 printType(Out, I->getType()->getElementType(), false,
1530 Mang->getValueName(I));
1532 if (I->hasLinkOnceLinkage())
1533 Out << " __attribute__((common))";
1534 else if (I->hasWeakLinkage())
1535 Out << " __ATTRIBUTE_WEAK__";
1536 else if (I->hasExternalWeakLinkage())
1537 Out << " __EXTERNAL_WEAK__";
1538 if (I->hasHiddenVisibility())
1539 Out << " __HIDDEN__";
1544 // Output the global variable definitions and contents...
1545 if (!M.global_empty()) {
1546 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1547 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1549 if (!I->isExternal()) {
1550 // Ignore special globals, such as debug info.
1551 if (getGlobalVariableClass(I))
1554 if (I->hasInternalLinkage())
1556 else if (I->hasDLLImportLinkage())
1557 Out << "__declspec(dllimport) ";
1558 else if (I->hasDLLExportLinkage())
1559 Out << "__declspec(dllexport) ";
1561 printType(Out, I->getType()->getElementType(), false,
1562 Mang->getValueName(I));
1563 if (I->hasLinkOnceLinkage())
1564 Out << " __attribute__((common))";
1565 else if (I->hasWeakLinkage())
1566 Out << " __ATTRIBUTE_WEAK__";
1568 if (I->hasHiddenVisibility())
1569 Out << " __HIDDEN__";
1571 // If the initializer is not null, emit the initializer. If it is null,
1572 // we try to avoid emitting large amounts of zeros. The problem with
1573 // this, however, occurs when the variable has weak linkage. In this
1574 // case, the assembler will complain about the variable being both weak
1575 // and common, so we disable this optimization.
1576 if (!I->getInitializer()->isNullValue()) {
1578 writeOperand(I->getInitializer());
1579 } else if (I->hasWeakLinkage()) {
1580 // We have to specify an initializer, but it doesn't have to be
1581 // complete. If the value is an aggregate, print out { 0 }, and let
1582 // the compiler figure out the rest of the zeros.
1584 if (isa<StructType>(I->getInitializer()->getType()) ||
1585 isa<ArrayType>(I->getInitializer()->getType()) ||
1586 isa<PackedType>(I->getInitializer()->getType())) {
1589 // Just print it out normally.
1590 writeOperand(I->getInitializer());
1598 Out << "\n\n/* Function Bodies */\n";
1600 // Emit some helper functions for dealing with FCMP instruction's
1602 Out << "static inline int llvm_fcmp_ord(double X, double Y) { ";
1603 Out << "return X == X && Y == Y; }\n";
1604 Out << "static inline int llvm_fcmp_uno(double X, double Y) { ";
1605 Out << "return X != X || Y != Y; }\n";
1606 Out << "static inline int llvm_fcmp_ueq(double X, double Y) { ";
1607 Out << "return X == Y || llvm_fcmp_uno(X, Y); }\n";
1608 Out << "static inline int llvm_fcmp_une(double X, double Y) { ";
1609 Out << "return X != Y; }\n";
1610 Out << "static inline int llvm_fcmp_ult(double X, double Y) { ";
1611 Out << "return X < Y || llvm_fcmp_uno(X, Y); }\n";
1612 Out << "static inline int llvm_fcmp_ugt(double X, double Y) { ";
1613 Out << "return X > Y || llvm_fcmp_uno(X, Y); }\n";
1614 Out << "static inline int llvm_fcmp_ule(double X, double Y) { ";
1615 Out << "return X <= Y || llvm_fcmp_uno(X, Y); }\n";
1616 Out << "static inline int llvm_fcmp_uge(double X, double Y) { ";
1617 Out << "return X >= Y || llvm_fcmp_uno(X, Y); }\n";
1618 Out << "static inline int llvm_fcmp_oeq(double X, double Y) { ";
1619 Out << "return X == Y ; }\n";
1620 Out << "static inline int llvm_fcmp_one(double X, double Y) { ";
1621 Out << "return X != Y && llvm_fcmp_ord(X, Y); }\n";
1622 Out << "static inline int llvm_fcmp_olt(double X, double Y) { ";
1623 Out << "return X < Y ; }\n";
1624 Out << "static inline int llvm_fcmp_ogt(double X, double Y) { ";
1625 Out << "return X > Y ; }\n";
1626 Out << "static inline int llvm_fcmp_ole(double X, double Y) { ";
1627 Out << "return X <= Y ; }\n";
1628 Out << "static inline int llvm_fcmp_oge(double X, double Y) { ";
1629 Out << "return X >= Y ; }\n";
1634 /// Output all floating point constants that cannot be printed accurately...
1635 void CWriter::printFloatingPointConstants(Function &F) {
1636 // Scan the module for floating point constants. If any FP constant is used
1637 // in the function, we want to redirect it here so that we do not depend on
1638 // the precision of the printed form, unless the printed form preserves
1641 static unsigned FPCounter = 0;
1642 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1644 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1645 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1646 !FPConstantMap.count(FPC)) {
1647 double Val = FPC->getValue();
1649 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1651 if (FPC->getType() == Type::DoubleTy) {
1652 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1653 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1654 << "ULL; /* " << Val << " */\n";
1655 } else if (FPC->getType() == Type::FloatTy) {
1656 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1657 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1658 << "U; /* " << Val << " */\n";
1660 assert(0 && "Unknown float type!");
1667 /// printSymbolTable - Run through symbol table looking for type names. If a
1668 /// type name is found, emit its declaration...
1670 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1671 Out << "/* Helper union for bitcasts */\n";
1672 Out << "typedef union {\n";
1673 Out << " unsigned int Int32;\n";
1674 Out << " unsigned long long Int64;\n";
1675 Out << " float Float;\n";
1676 Out << " double Double;\n";
1677 Out << "} llvmBitCastUnion;\n";
1679 // We are only interested in the type plane of the symbol table.
1680 TypeSymbolTable::const_iterator I = TST.begin();
1681 TypeSymbolTable::const_iterator End = TST.end();
1683 // If there are no type names, exit early.
1684 if (I == End) return;
1686 // Print out forward declarations for structure types before anything else!
1687 Out << "/* Structure forward decls */\n";
1688 for (; I != End; ++I)
1689 if (const Type *STy = dyn_cast<StructType>(I->second)) {
1690 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1691 Out << Name << ";\n";
1692 TypeNames.insert(std::make_pair(STy, Name));
1697 // Now we can print out typedefs...
1698 Out << "/* Typedefs */\n";
1699 for (I = TST.begin(); I != End; ++I) {
1700 const Type *Ty = cast<Type>(I->second);
1701 std::string Name = "l_" + Mang->makeNameProper(I->first);
1703 printType(Out, Ty, false, Name);
1709 // Keep track of which structures have been printed so far...
1710 std::set<const StructType *> StructPrinted;
1712 // Loop over all structures then push them into the stack so they are
1713 // printed in the correct order.
1715 Out << "/* Structure contents */\n";
1716 for (I = TST.begin(); I != End; ++I)
1717 if (const StructType *STy = dyn_cast<StructType>(I->second))
1718 // Only print out used types!
1719 printContainedStructs(STy, StructPrinted);
1722 // Push the struct onto the stack and recursively push all structs
1723 // this one depends on.
1725 // TODO: Make this work properly with packed types
1727 void CWriter::printContainedStructs(const Type *Ty,
1728 std::set<const StructType*> &StructPrinted){
1729 // Don't walk through pointers.
1730 if (isa<PointerType>(Ty) || Ty->isPrimitiveType() || Ty->isInteger()) return;
1732 // Print all contained types first.
1733 for (Type::subtype_iterator I = Ty->subtype_begin(),
1734 E = Ty->subtype_end(); I != E; ++I)
1735 printContainedStructs(*I, StructPrinted);
1737 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1738 // Check to see if we have already printed this struct.
1739 if (StructPrinted.insert(STy).second) {
1740 // Print structure type out.
1741 std::string Name = TypeNames[STy];
1742 printType(Out, STy, false, Name, true);
1748 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1749 /// isCStructReturn - Should this function actually return a struct by-value?
1750 bool isCStructReturn = F->getCallingConv() == CallingConv::CSRet;
1752 if (F->hasInternalLinkage()) Out << "static ";
1753 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1754 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1755 switch (F->getCallingConv()) {
1756 case CallingConv::X86_StdCall:
1757 Out << "__stdcall ";
1759 case CallingConv::X86_FastCall:
1760 Out << "__fastcall ";
1764 // Loop over the arguments, printing them...
1765 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1767 std::stringstream FunctionInnards;
1769 // Print out the name...
1770 FunctionInnards << Mang->getValueName(F) << '(';
1772 bool PrintedArg = false;
1773 if (!F->isExternal()) {
1774 if (!F->arg_empty()) {
1775 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1777 // If this is a struct-return function, don't print the hidden
1778 // struct-return argument.
1779 if (isCStructReturn) {
1780 assert(I != E && "Invalid struct return function!");
1784 std::string ArgName;
1786 for (; I != E; ++I) {
1787 if (PrintedArg) FunctionInnards << ", ";
1788 if (I->hasName() || !Prototype)
1789 ArgName = Mang->getValueName(I);
1792 printType(FunctionInnards, I->getType(),
1793 /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute),
1800 // Loop over the arguments, printing them.
1801 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1803 // If this is a struct-return function, don't print the hidden
1804 // struct-return argument.
1805 if (isCStructReturn) {
1806 assert(I != E && "Invalid struct return function!");
1811 for (; I != E; ++I) {
1812 if (PrintedArg) FunctionInnards << ", ";
1813 printType(FunctionInnards, *I,
1814 /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute));
1820 // Finish printing arguments... if this is a vararg function, print the ...,
1821 // unless there are no known types, in which case, we just emit ().
1823 if (FT->isVarArg() && PrintedArg) {
1824 if (PrintedArg) FunctionInnards << ", ";
1825 FunctionInnards << "..."; // Output varargs portion of signature!
1826 } else if (!FT->isVarArg() && !PrintedArg) {
1827 FunctionInnards << "void"; // ret() -> ret(void) in C.
1829 FunctionInnards << ')';
1831 // Get the return tpe for the function.
1833 if (!isCStructReturn)
1834 RetTy = F->getReturnType();
1836 // If this is a struct-return function, print the struct-return type.
1837 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1840 // Print out the return type and the signature built above.
1841 printType(Out, RetTy,
1842 /*isSigned=*/FT->paramHasAttr(0, FunctionType::SExtAttribute),
1843 FunctionInnards.str());
1846 static inline bool isFPIntBitCast(const Instruction &I) {
1847 if (!isa<BitCastInst>(I))
1849 const Type *SrcTy = I.getOperand(0)->getType();
1850 const Type *DstTy = I.getType();
1851 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1852 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1855 void CWriter::printFunction(Function &F) {
1856 printFunctionSignature(&F, false);
1859 // If this is a struct return function, handle the result with magic.
1860 if (F.getCallingConv() == CallingConv::CSRet) {
1861 const Type *StructTy =
1862 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1864 printType(Out, StructTy, false, "StructReturn");
1865 Out << "; /* Struct return temporary */\n";
1868 printType(Out, F.arg_begin()->getType(), false,
1869 Mang->getValueName(F.arg_begin()));
1870 Out << " = &StructReturn;\n";
1873 bool PrintedVar = false;
1875 // print local variable information for the function
1876 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1877 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1879 printType(Out, AI->getAllocatedType(), false, Mang->getValueName(AI));
1880 Out << "; /* Address-exposed local */\n";
1882 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1884 printType(Out, I->getType(), false, Mang->getValueName(&*I));
1887 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1889 printType(Out, I->getType(), false,
1890 Mang->getValueName(&*I)+"__PHI_TEMPORARY");
1895 // We need a temporary for the BitCast to use so it can pluck a value out
1896 // of a union to do the BitCast. This is separate from the need for a
1897 // variable to hold the result of the BitCast.
1898 if (isFPIntBitCast(*I)) {
1899 Out << " llvmBitCastUnion " << Mang->getValueName(&*I)
1900 << "__BITCAST_TEMPORARY;\n";
1908 if (F.hasExternalLinkage() && F.getName() == "main")
1909 Out << " CODE_FOR_MAIN();\n";
1911 // print the basic blocks
1912 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1913 if (Loop *L = LI->getLoopFor(BB)) {
1914 if (L->getHeader() == BB && L->getParentLoop() == 0)
1917 printBasicBlock(BB);
1924 void CWriter::printLoop(Loop *L) {
1925 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1926 << "' to make GCC happy */\n";
1927 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1928 BasicBlock *BB = L->getBlocks()[i];
1929 Loop *BBLoop = LI->getLoopFor(BB);
1931 printBasicBlock(BB);
1932 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
1935 Out << " } while (1); /* end of syntactic loop '"
1936 << L->getHeader()->getName() << "' */\n";
1939 void CWriter::printBasicBlock(BasicBlock *BB) {
1941 // Don't print the label for the basic block if there are no uses, or if
1942 // the only terminator use is the predecessor basic block's terminator.
1943 // We have to scan the use list because PHI nodes use basic blocks too but
1944 // do not require a label to be generated.
1946 bool NeedsLabel = false;
1947 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
1948 if (isGotoCodeNecessary(*PI, BB)) {
1953 if (NeedsLabel) Out << Mang->getValueName(BB) << ":\n";
1955 // Output all of the instructions in the basic block...
1956 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
1958 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
1959 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
1968 // Don't emit prefix or suffix for the terminator...
1969 visit(*BB->getTerminator());
1973 // Specific Instruction type classes... note that all of the casts are
1974 // necessary because we use the instruction classes as opaque types...
1976 void CWriter::visitReturnInst(ReturnInst &I) {
1977 // If this is a struct return function, return the temporary struct.
1978 if (I.getParent()->getParent()->getCallingConv() == CallingConv::CSRet) {
1979 Out << " return StructReturn;\n";
1983 // Don't output a void return if this is the last basic block in the function
1984 if (I.getNumOperands() == 0 &&
1985 &*--I.getParent()->getParent()->end() == I.getParent() &&
1986 !I.getParent()->size() == 1) {
1991 if (I.getNumOperands()) {
1993 writeOperand(I.getOperand(0));
1998 void CWriter::visitSwitchInst(SwitchInst &SI) {
2001 writeOperand(SI.getOperand(0));
2002 Out << ") {\n default:\n";
2003 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
2004 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
2006 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
2008 writeOperand(SI.getOperand(i));
2010 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
2011 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
2012 printBranchToBlock(SI.getParent(), Succ, 2);
2013 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
2019 void CWriter::visitUnreachableInst(UnreachableInst &I) {
2020 Out << " /*UNREACHABLE*/;\n";
2023 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
2024 /// FIXME: This should be reenabled, but loop reordering safe!!
2027 if (next(Function::iterator(From)) != Function::iterator(To))
2028 return true; // Not the direct successor, we need a goto.
2030 //isa<SwitchInst>(From->getTerminator())
2032 if (LI->getLoopFor(From) != LI->getLoopFor(To))
2037 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
2038 BasicBlock *Successor,
2040 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
2041 PHINode *PN = cast<PHINode>(I);
2042 // Now we have to do the printing.
2043 Value *IV = PN->getIncomingValueForBlock(CurBlock);
2044 if (!isa<UndefValue>(IV)) {
2045 Out << std::string(Indent, ' ');
2046 Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = ";
2048 Out << "; /* for PHI node */\n";
2053 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2055 if (isGotoCodeNecessary(CurBB, Succ)) {
2056 Out << std::string(Indent, ' ') << " goto ";
2062 // Branch instruction printing - Avoid printing out a branch to a basic block
2063 // that immediately succeeds the current one.
2065 void CWriter::visitBranchInst(BranchInst &I) {
2067 if (I.isConditional()) {
2068 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2070 writeOperand(I.getCondition());
2073 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2074 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2076 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2077 Out << " } else {\n";
2078 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2079 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2082 // First goto not necessary, assume second one is...
2084 writeOperand(I.getCondition());
2087 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2088 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2093 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2094 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2099 // PHI nodes get copied into temporary values at the end of predecessor basic
2100 // blocks. We now need to copy these temporary values into the REAL value for
2102 void CWriter::visitPHINode(PHINode &I) {
2104 Out << "__PHI_TEMPORARY";
2108 void CWriter::visitBinaryOperator(Instruction &I) {
2109 // binary instructions, shift instructions, setCond instructions.
2110 assert(!isa<PointerType>(I.getType()));
2112 // We must cast the results of binary operations which might be promoted.
2113 bool needsCast = false;
2114 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2115 || (I.getType() == Type::FloatTy)) {
2118 printType(Out, I.getType(), false);
2122 // If this is a negation operation, print it out as such. For FP, we don't
2123 // want to print "-0.0 - X".
2124 if (BinaryOperator::isNeg(&I)) {
2126 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2128 } else if (I.getOpcode() == Instruction::FRem) {
2129 // Output a call to fmod/fmodf instead of emitting a%b
2130 if (I.getType() == Type::FloatTy)
2134 writeOperand(I.getOperand(0));
2136 writeOperand(I.getOperand(1));
2140 // Write out the cast of the instruction's value back to the proper type
2142 bool NeedsClosingParens = writeInstructionCast(I);
2144 // Certain instructions require the operand to be forced to a specific type
2145 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2146 // below for operand 1
2147 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2149 switch (I.getOpcode()) {
2150 case Instruction::Add: Out << " + "; break;
2151 case Instruction::Sub: Out << " - "; break;
2152 case Instruction::Mul: Out << '*'; break;
2153 case Instruction::URem:
2154 case Instruction::SRem:
2155 case Instruction::FRem: Out << '%'; break;
2156 case Instruction::UDiv:
2157 case Instruction::SDiv:
2158 case Instruction::FDiv: Out << '/'; break;
2159 case Instruction::And: Out << " & "; break;
2160 case Instruction::Or: Out << " | "; break;
2161 case Instruction::Xor: Out << " ^ "; break;
2162 case Instruction::Shl : Out << " << "; break;
2163 case Instruction::LShr:
2164 case Instruction::AShr: Out << " >> "; break;
2165 default: cerr << "Invalid operator type!" << I; abort();
2168 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2169 if (NeedsClosingParens)
2178 void CWriter::visitICmpInst(ICmpInst &I) {
2179 // We must cast the results of icmp which might be promoted.
2180 bool needsCast = false;
2182 // Write out the cast of the instruction's value back to the proper type
2184 bool NeedsClosingParens = writeInstructionCast(I);
2186 // Certain icmp predicate require the operand to be forced to a specific type
2187 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2188 // below for operand 1
2189 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2191 switch (I.getPredicate()) {
2192 case ICmpInst::ICMP_EQ: Out << " == "; break;
2193 case ICmpInst::ICMP_NE: Out << " != "; break;
2194 case ICmpInst::ICMP_ULE:
2195 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2196 case ICmpInst::ICMP_UGE:
2197 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2198 case ICmpInst::ICMP_ULT:
2199 case ICmpInst::ICMP_SLT: Out << " < "; break;
2200 case ICmpInst::ICMP_UGT:
2201 case ICmpInst::ICMP_SGT: Out << " > "; break;
2202 default: cerr << "Invalid icmp predicate!" << I; abort();
2205 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2206 if (NeedsClosingParens)
2214 void CWriter::visitFCmpInst(FCmpInst &I) {
2215 if (I.getPredicate() == FCmpInst::FCMP_FALSE) {
2219 if (I.getPredicate() == FCmpInst::FCMP_TRUE) {
2225 switch (I.getPredicate()) {
2226 default: assert(0 && "Illegal FCmp predicate");
2227 case FCmpInst::FCMP_ORD: op = "ord"; break;
2228 case FCmpInst::FCMP_UNO: op = "uno"; break;
2229 case FCmpInst::FCMP_UEQ: op = "ueq"; break;
2230 case FCmpInst::FCMP_UNE: op = "une"; break;
2231 case FCmpInst::FCMP_ULT: op = "ult"; break;
2232 case FCmpInst::FCMP_ULE: op = "ule"; break;
2233 case FCmpInst::FCMP_UGT: op = "ugt"; break;
2234 case FCmpInst::FCMP_UGE: op = "uge"; break;
2235 case FCmpInst::FCMP_OEQ: op = "oeq"; break;
2236 case FCmpInst::FCMP_ONE: op = "one"; break;
2237 case FCmpInst::FCMP_OLT: op = "olt"; break;
2238 case FCmpInst::FCMP_OLE: op = "ole"; break;
2239 case FCmpInst::FCMP_OGT: op = "ogt"; break;
2240 case FCmpInst::FCMP_OGE: op = "oge"; break;
2243 Out << "llvm_fcmp_" << op << "(";
2244 // Write the first operand
2245 writeOperand(I.getOperand(0));
2247 // Write the second operand
2248 writeOperand(I.getOperand(1));
2252 static const char * getFloatBitCastField(const Type *Ty) {
2253 switch (Ty->getTypeID()) {
2254 default: assert(0 && "Invalid Type");
2255 case Type::FloatTyID: return "Float";
2256 case Type::DoubleTyID: return "Double";
2257 case Type::IntegerTyID: {
2258 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth();
2267 void CWriter::visitCastInst(CastInst &I) {
2268 const Type *DstTy = I.getType();
2269 const Type *SrcTy = I.getOperand(0)->getType();
2271 if (isFPIntBitCast(I)) {
2272 // These int<->float and long<->double casts need to be handled specially
2273 Out << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2274 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2275 writeOperand(I.getOperand(0));
2276 Out << ", " << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2277 << getFloatBitCastField(I.getType());
2279 printCast(I.getOpcode(), SrcTy, DstTy);
2280 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::Int1Ty) {
2281 // Make sure we really get a sext from bool by subtracing the bool from 0
2284 writeOperand(I.getOperand(0));
2285 if (DstTy == Type::Int1Ty &&
2286 (I.getOpcode() == Instruction::Trunc ||
2287 I.getOpcode() == Instruction::FPToUI ||
2288 I.getOpcode() == Instruction::FPToSI ||
2289 I.getOpcode() == Instruction::PtrToInt)) {
2290 // Make sure we really get a trunc to bool by anding the operand with 1
2297 void CWriter::visitSelectInst(SelectInst &I) {
2299 writeOperand(I.getCondition());
2301 writeOperand(I.getTrueValue());
2303 writeOperand(I.getFalseValue());
2308 void CWriter::lowerIntrinsics(Function &F) {
2309 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2310 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2311 if (CallInst *CI = dyn_cast<CallInst>(I++))
2312 if (Function *F = CI->getCalledFunction())
2313 switch (F->getIntrinsicID()) {
2314 case Intrinsic::not_intrinsic:
2315 case Intrinsic::vastart:
2316 case Intrinsic::vacopy:
2317 case Intrinsic::vaend:
2318 case Intrinsic::returnaddress:
2319 case Intrinsic::frameaddress:
2320 case Intrinsic::setjmp:
2321 case Intrinsic::longjmp:
2322 case Intrinsic::prefetch:
2323 case Intrinsic::dbg_stoppoint:
2324 case Intrinsic::powi_f32:
2325 case Intrinsic::powi_f64:
2326 // We directly implement these intrinsics
2329 // If this is an intrinsic that directly corresponds to a GCC
2330 // builtin, we handle it.
2331 const char *BuiltinName = "";
2332 #define GET_GCC_BUILTIN_NAME
2333 #include "llvm/Intrinsics.gen"
2334 #undef GET_GCC_BUILTIN_NAME
2335 // If we handle it, don't lower it.
2336 if (BuiltinName[0]) break;
2338 // All other intrinsic calls we must lower.
2339 Instruction *Before = 0;
2340 if (CI != &BB->front())
2341 Before = prior(BasicBlock::iterator(CI));
2343 IL.LowerIntrinsicCall(CI);
2344 if (Before) { // Move iterator to instruction after call
2355 void CWriter::visitCallInst(CallInst &I) {
2356 //check if we have inline asm
2357 if (isInlineAsm(I)) {
2362 bool WroteCallee = false;
2364 // Handle intrinsic function calls first...
2365 if (Function *F = I.getCalledFunction())
2366 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2369 // If this is an intrinsic that directly corresponds to a GCC
2370 // builtin, we emit it here.
2371 const char *BuiltinName = "";
2372 #define GET_GCC_BUILTIN_NAME
2373 #include "llvm/Intrinsics.gen"
2374 #undef GET_GCC_BUILTIN_NAME
2375 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2381 case Intrinsic::vastart:
2384 Out << "va_start(*(va_list*)";
2385 writeOperand(I.getOperand(1));
2387 // Output the last argument to the enclosing function...
2388 if (I.getParent()->getParent()->arg_empty()) {
2389 cerr << "The C backend does not currently support zero "
2390 << "argument varargs functions, such as '"
2391 << I.getParent()->getParent()->getName() << "'!\n";
2394 writeOperand(--I.getParent()->getParent()->arg_end());
2397 case Intrinsic::vaend:
2398 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2399 Out << "0; va_end(*(va_list*)";
2400 writeOperand(I.getOperand(1));
2403 Out << "va_end(*(va_list*)0)";
2406 case Intrinsic::vacopy:
2408 Out << "va_copy(*(va_list*)";
2409 writeOperand(I.getOperand(1));
2410 Out << ", *(va_list*)";
2411 writeOperand(I.getOperand(2));
2414 case Intrinsic::returnaddress:
2415 Out << "__builtin_return_address(";
2416 writeOperand(I.getOperand(1));
2419 case Intrinsic::frameaddress:
2420 Out << "__builtin_frame_address(";
2421 writeOperand(I.getOperand(1));
2424 case Intrinsic::powi_f32:
2425 case Intrinsic::powi_f64:
2426 Out << "__builtin_powi(";
2427 writeOperand(I.getOperand(1));
2429 writeOperand(I.getOperand(2));
2432 case Intrinsic::setjmp:
2433 Out << "setjmp(*(jmp_buf*)";
2434 writeOperand(I.getOperand(1));
2437 case Intrinsic::longjmp:
2438 Out << "longjmp(*(jmp_buf*)";
2439 writeOperand(I.getOperand(1));
2441 writeOperand(I.getOperand(2));
2444 case Intrinsic::prefetch:
2445 Out << "LLVM_PREFETCH((const void *)";
2446 writeOperand(I.getOperand(1));
2448 writeOperand(I.getOperand(2));
2450 writeOperand(I.getOperand(3));
2453 case Intrinsic::dbg_stoppoint: {
2454 // If we use writeOperand directly we get a "u" suffix which is rejected
2456 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2460 << " \"" << SPI.getDirectory()
2461 << SPI.getFileName() << "\"\n";
2467 Value *Callee = I.getCalledValue();
2469 // If this is a call to a struct-return function, assign to the first
2470 // parameter instead of passing it to the call.
2471 bool isStructRet = I.getCallingConv() == CallingConv::CSRet;
2474 writeOperand(I.getOperand(1));
2478 if (I.isTailCall()) Out << " /*tail*/ ";
2480 const PointerType *PTy = cast<PointerType>(Callee->getType());
2481 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2484 // If this is an indirect call to a struct return function, we need to cast
2486 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2488 // GCC is a real PITA. It does not permit codegening casts of functions to
2489 // function pointers if they are in a call (it generates a trap instruction
2490 // instead!). We work around this by inserting a cast to void* in between
2491 // the function and the function pointer cast. Unfortunately, we can't just
2492 // form the constant expression here, because the folder will immediately
2495 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2496 // that void* and function pointers have the same size. :( To deal with this
2497 // in the common case, we handle casts where the number of arguments passed
2500 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2502 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2508 // Ok, just cast the pointer type.
2511 printType(Out, I.getCalledValue()->getType());
2513 printStructReturnPointerFunctionType(Out,
2514 cast<PointerType>(I.getCalledValue()->getType()));
2517 writeOperand(Callee);
2518 if (NeedsCast) Out << ')';
2523 unsigned NumDeclaredParams = FTy->getNumParams();
2525 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2527 if (isStructRet) { // Skip struct return argument.
2532 bool PrintedArg = false;
2534 for (; AI != AE; ++AI, ++ArgNo, ++Idx) {
2535 if (PrintedArg) Out << ", ";
2536 if (ArgNo < NumDeclaredParams &&
2537 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2539 printType(Out, FTy->getParamType(ArgNo),
2540 /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute));
2550 //This converts the llvm constraint string to something gcc is expecting.
2551 //TODO: work out platform independent constraints and factor those out
2552 // of the per target tables
2553 // handle multiple constraint codes
2554 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2556 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2558 const char** table = 0;
2560 //Grab the translation table from TargetAsmInfo if it exists
2563 const TargetMachineRegistry::Entry* Match =
2564 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2566 //Per platform Target Machines don't exist, so create it
2567 // this must be done only once
2568 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2569 TAsm = TM->getTargetAsmInfo();
2573 table = TAsm->getAsmCBE();
2575 //Search the translation table if it exists
2576 for (int i = 0; table && table[i]; i += 2)
2577 if (c.Codes[0] == table[i])
2580 //default is identity
2584 //TODO: import logic from AsmPrinter.cpp
2585 static std::string gccifyAsm(std::string asmstr) {
2586 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2587 if (asmstr[i] == '\n')
2588 asmstr.replace(i, 1, "\\n");
2589 else if (asmstr[i] == '\t')
2590 asmstr.replace(i, 1, "\\t");
2591 else if (asmstr[i] == '$') {
2592 if (asmstr[i + 1] == '{') {
2593 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2594 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2595 std::string n = "%" +
2596 asmstr.substr(a + 1, b - a - 1) +
2597 asmstr.substr(i + 2, a - i - 2);
2598 asmstr.replace(i, b - i + 1, n);
2601 asmstr.replace(i, 1, "%");
2603 else if (asmstr[i] == '%')//grr
2604 { asmstr.replace(i, 1, "%%"); ++i;}
2609 //TODO: assumptions about what consume arguments from the call are likely wrong
2610 // handle communitivity
2611 void CWriter::visitInlineAsm(CallInst &CI) {
2612 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2613 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2614 std::vector<std::pair<std::string, Value*> > Input;
2615 std::vector<std::pair<std::string, Value*> > Output;
2616 std::string Clobber;
2617 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2618 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2619 E = Constraints.end(); I != E; ++I) {
2620 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2622 InterpretASMConstraint(*I);
2625 assert(0 && "Unknown asm constraint");
2627 case InlineAsm::isInput: {
2629 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2630 ++count; //consume arg
2634 case InlineAsm::isOutput: {
2636 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2637 count ? CI.getOperand(count) : &CI));
2638 ++count; //consume arg
2642 case InlineAsm::isClobber: {
2644 Clobber += ",\"" + c + "\"";
2650 //fix up the asm string for gcc
2651 std::string asmstr = gccifyAsm(as->getAsmString());
2653 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2655 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2656 E = Output.end(); I != E; ++I) {
2657 Out << "\"" << I->first << "\"(";
2658 writeOperandRaw(I->second);
2664 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2665 E = Input.end(); I != E; ++I) {
2666 Out << "\"" << I->first << "\"(";
2667 writeOperandRaw(I->second);
2673 Out << "\n :" << Clobber.substr(1);
2677 void CWriter::visitMallocInst(MallocInst &I) {
2678 assert(0 && "lowerallocations pass didn't work!");
2681 void CWriter::visitAllocaInst(AllocaInst &I) {
2683 printType(Out, I.getType());
2684 Out << ") alloca(sizeof(";
2685 printType(Out, I.getType()->getElementType());
2687 if (I.isArrayAllocation()) {
2689 writeOperand(I.getOperand(0));
2694 void CWriter::visitFreeInst(FreeInst &I) {
2695 assert(0 && "lowerallocations pass didn't work!");
2698 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2699 gep_type_iterator E) {
2700 bool HasImplicitAddress = false;
2701 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2702 if (isa<GlobalValue>(Ptr)) {
2703 HasImplicitAddress = true;
2704 } else if (isDirectAlloca(Ptr)) {
2705 HasImplicitAddress = true;
2709 if (!HasImplicitAddress)
2710 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2712 writeOperandInternal(Ptr);
2716 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2717 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2720 writeOperandInternal(Ptr);
2722 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2724 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2727 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2728 "Can only have implicit address with direct accessing");
2730 if (HasImplicitAddress) {
2732 } else if (CI && CI->isNullValue()) {
2733 gep_type_iterator TmpI = I; ++TmpI;
2735 // Print out the -> operator if possible...
2736 if (TmpI != E && isa<StructType>(*TmpI)) {
2737 Out << (HasImplicitAddress ? "." : "->");
2738 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2744 if (isa<StructType>(*I)) {
2745 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2748 writeOperand(I.getOperand());
2753 void CWriter::visitLoadInst(LoadInst &I) {
2755 if (I.isVolatile()) {
2757 printType(Out, I.getType(), false, "volatile*");
2761 writeOperand(I.getOperand(0));
2767 void CWriter::visitStoreInst(StoreInst &I) {
2769 if (I.isVolatile()) {
2771 printType(Out, I.getOperand(0)->getType(), false, " volatile*");
2774 writeOperand(I.getPointerOperand());
2775 if (I.isVolatile()) Out << ')';
2777 writeOperand(I.getOperand(0));
2780 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2782 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2786 void CWriter::visitVAArgInst(VAArgInst &I) {
2787 Out << "va_arg(*(va_list*)";
2788 writeOperand(I.getOperand(0));
2790 printType(Out, I.getType());
2794 //===----------------------------------------------------------------------===//
2795 // External Interface declaration
2796 //===----------------------------------------------------------------------===//
2798 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2800 CodeGenFileType FileType,
2802 if (FileType != TargetMachine::AssemblyFile) return true;
2804 PM.add(createLowerGCPass());
2805 PM.add(createLowerAllocationsPass(true));
2806 PM.add(createLowerInvokePass());
2807 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2808 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2809 PM.add(new CWriter(o));