1 //===-- Writer.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 = true,
119 const std::string &VariableName = "",
120 bool IgnoreName = false);
121 std::ostream &printPrimitiveType(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::printPrimitiveType(std::ostream &Out, const Type *Ty, bool isSigned,
368 const std::string &NameSoFar) {
369 assert(Ty->isPrimitiveType() && "Invalid type for printPrimitiveType");
370 switch (Ty->getTypeID()) {
371 case Type::VoidTyID: return Out << "void " << NameSoFar;
372 case Type::BoolTyID: return Out << "bool " << NameSoFar;
374 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
375 case Type::Int16TyID:
376 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
377 case Type::Int32TyID:
378 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
379 case Type::Int64TyID:
380 return Out << (isSigned?"signed":"unsigned") << " long long " << NameSoFar;
381 case Type::FloatTyID: return Out << "float " << NameSoFar;
382 case Type::DoubleTyID: return Out << "double " << NameSoFar;
384 cerr << "Unknown primitive type: " << *Ty << "\n";
389 // Pass the Type* and the variable name and this prints out the variable
392 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
393 bool isSigned, const std::string &NameSoFar,
395 if (Ty->isPrimitiveType()) {
396 // FIXME:Signedness. When integer types are signless, this should just
397 // always pass "false" for the sign of the primitive type. The instructions
398 // will figure out how the value is to be interpreted.
399 printPrimitiveType(Out, Ty, isSigned, NameSoFar);
403 // Check to see if the type is named.
404 if (!IgnoreName || isa<OpaqueType>(Ty)) {
405 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
406 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
409 switch (Ty->getTypeID()) {
410 case Type::FunctionTyID: {
411 const FunctionType *FTy = cast<FunctionType>(Ty);
412 std::stringstream FunctionInnards;
413 FunctionInnards << " (" << NameSoFar << ") (";
415 for (FunctionType::param_iterator I = FTy->param_begin(),
416 E = FTy->param_end(); I != E; ++I) {
417 if (I != FTy->param_begin())
418 FunctionInnards << ", ";
419 printType(FunctionInnards, *I,
420 /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute), "");
423 if (FTy->isVarArg()) {
424 if (FTy->getNumParams())
425 FunctionInnards << ", ...";
426 } else if (!FTy->getNumParams()) {
427 FunctionInnards << "void";
429 FunctionInnards << ')';
430 std::string tstr = FunctionInnards.str();
431 printType(Out, FTy->getReturnType(),
432 /*isSigned=*/FTy->paramHasAttr(0, FunctionType::SExtAttribute), tstr);
435 case Type::StructTyID: {
436 const StructType *STy = cast<StructType>(Ty);
437 Out << NameSoFar + " {\n";
439 for (StructType::element_iterator I = STy->element_begin(),
440 E = STy->element_end(); I != E; ++I) {
442 printType(Out, *I, true, "field" + utostr(Idx++));
448 case Type::PointerTyID: {
449 const PointerType *PTy = cast<PointerType>(Ty);
450 std::string ptrName = "*" + NameSoFar;
452 if (isa<ArrayType>(PTy->getElementType()) ||
453 isa<PackedType>(PTy->getElementType()))
454 ptrName = "(" + ptrName + ")";
456 return printType(Out, PTy->getElementType(), true, ptrName);
459 case Type::ArrayTyID: {
460 const ArrayType *ATy = cast<ArrayType>(Ty);
461 unsigned NumElements = ATy->getNumElements();
462 if (NumElements == 0) NumElements = 1;
463 return printType(Out, ATy->getElementType(), true,
464 NameSoFar + "[" + utostr(NumElements) + "]");
467 case Type::PackedTyID: {
468 const PackedType *PTy = cast<PackedType>(Ty);
469 unsigned NumElements = PTy->getNumElements();
470 if (NumElements == 0) NumElements = 1;
471 return printType(Out, PTy->getElementType(), true,
472 NameSoFar + "[" + utostr(NumElements) + "]");
475 case Type::OpaqueTyID: {
476 static int Count = 0;
477 std::string TyName = "struct opaque_" + itostr(Count++);
478 assert(TypeNames.find(Ty) == TypeNames.end());
479 TypeNames[Ty] = TyName;
480 return Out << TyName << ' ' << NameSoFar;
483 assert(0 && "Unhandled case in getTypeProps!");
490 void CWriter::printConstantArray(ConstantArray *CPA) {
492 // As a special case, print the array as a string if it is an array of
493 // ubytes or an array of sbytes with positive values.
495 const Type *ETy = CPA->getType()->getElementType();
496 bool isString = (ETy == Type::Int8Ty || ETy == Type::Int8Ty);
498 // Make sure the last character is a null char, as automatically added by C
499 if (isString && (CPA->getNumOperands() == 0 ||
500 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
505 // Keep track of whether the last number was a hexadecimal escape
506 bool LastWasHex = false;
508 // Do not include the last character, which we know is null
509 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
510 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
512 // Print it out literally if it is a printable character. The only thing
513 // to be careful about is when the last letter output was a hex escape
514 // code, in which case we have to be careful not to print out hex digits
515 // explicitly (the C compiler thinks it is a continuation of the previous
516 // character, sheesh...)
518 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
520 if (C == '"' || C == '\\')
527 case '\n': Out << "\\n"; break;
528 case '\t': Out << "\\t"; break;
529 case '\r': Out << "\\r"; break;
530 case '\v': Out << "\\v"; break;
531 case '\a': Out << "\\a"; break;
532 case '\"': Out << "\\\""; break;
533 case '\'': Out << "\\\'"; break;
536 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
537 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
546 if (CPA->getNumOperands()) {
548 printConstant(cast<Constant>(CPA->getOperand(0)));
549 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
551 printConstant(cast<Constant>(CPA->getOperand(i)));
558 void CWriter::printConstantPacked(ConstantPacked *CP) {
560 if (CP->getNumOperands()) {
562 printConstant(cast<Constant>(CP->getOperand(0)));
563 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
565 printConstant(cast<Constant>(CP->getOperand(i)));
571 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
572 // textually as a double (rather than as a reference to a stack-allocated
573 // variable). We decide this by converting CFP to a string and back into a
574 // double, and then checking whether the conversion results in a bit-equal
575 // double to the original value of CFP. This depends on us and the target C
576 // compiler agreeing on the conversion process (which is pretty likely since we
577 // only deal in IEEE FP).
579 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
580 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
582 sprintf(Buffer, "%a", CFP->getValue());
584 if (!strncmp(Buffer, "0x", 2) ||
585 !strncmp(Buffer, "-0x", 3) ||
586 !strncmp(Buffer, "+0x", 3))
587 return atof(Buffer) == CFP->getValue();
590 std::string StrVal = ftostr(CFP->getValue());
592 while (StrVal[0] == ' ')
593 StrVal.erase(StrVal.begin());
595 // Check to make sure that the stringized number is not some string like "Inf"
596 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
597 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
598 ((StrVal[0] == '-' || StrVal[0] == '+') &&
599 (StrVal[1] >= '0' && StrVal[1] <= '9')))
600 // Reparse stringized version!
601 return atof(StrVal.c_str()) == CFP->getValue();
606 /// Print out the casting for a cast operation. This does the double casting
607 /// necessary for conversion to the destination type, if necessary.
608 /// @brief Print a cast
609 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
610 // Print the destination type cast
612 case Instruction::UIToFP:
613 case Instruction::SIToFP:
614 case Instruction::IntToPtr:
615 case Instruction::Trunc:
616 case Instruction::BitCast:
617 case Instruction::FPExt:
618 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
620 printType(Out, DstTy);
623 case Instruction::ZExt:
624 case Instruction::PtrToInt:
625 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
627 printPrimitiveType(Out, DstTy, false);
630 case Instruction::SExt:
631 case Instruction::FPToSI: // For these, make sure we get a signed dest
633 printPrimitiveType(Out, DstTy, true);
637 assert(0 && "Invalid cast opcode");
640 // Print the source type cast
642 case Instruction::UIToFP:
643 case Instruction::ZExt:
645 printPrimitiveType(Out, SrcTy, false);
648 case Instruction::SIToFP:
649 case Instruction::SExt:
651 printPrimitiveType(Out, SrcTy, true);
654 case Instruction::IntToPtr:
655 case Instruction::PtrToInt:
656 // Avoid "cast to pointer from integer of different size" warnings
657 Out << "(unsigned long)";
659 case Instruction::Trunc:
660 case Instruction::BitCast:
661 case Instruction::FPExt:
662 case Instruction::FPTrunc:
663 case Instruction::FPToSI:
664 case Instruction::FPToUI:
665 break; // These don't need a source cast.
667 assert(0 && "Invalid cast opcode");
672 // printConstant - The LLVM Constant to C Constant converter.
673 void CWriter::printConstant(Constant *CPV) {
674 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
675 switch (CE->getOpcode()) {
676 case Instruction::Trunc:
677 case Instruction::ZExt:
678 case Instruction::SExt:
679 case Instruction::FPTrunc:
680 case Instruction::FPExt:
681 case Instruction::UIToFP:
682 case Instruction::SIToFP:
683 case Instruction::FPToUI:
684 case Instruction::FPToSI:
685 case Instruction::PtrToInt:
686 case Instruction::IntToPtr:
687 case Instruction::BitCast:
689 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
690 if (CE->getOpcode() == Instruction::SExt &&
691 CE->getOperand(0)->getType() == Type::BoolTy) {
692 // Make sure we really sext from bool here by subtracting from 0
695 printConstant(CE->getOperand(0));
696 if (CE->getType() == Type::BoolTy &&
697 (CE->getOpcode() == Instruction::Trunc ||
698 CE->getOpcode() == Instruction::FPToUI ||
699 CE->getOpcode() == Instruction::FPToSI ||
700 CE->getOpcode() == Instruction::PtrToInt)) {
701 // Make sure we really truncate to bool here by anding with 1
707 case Instruction::GetElementPtr:
709 printIndexingExpression(CE->getOperand(0), gep_type_begin(CPV),
713 case Instruction::Select:
715 printConstant(CE->getOperand(0));
717 printConstant(CE->getOperand(1));
719 printConstant(CE->getOperand(2));
722 case Instruction::Add:
723 case Instruction::Sub:
724 case Instruction::Mul:
725 case Instruction::SDiv:
726 case Instruction::UDiv:
727 case Instruction::FDiv:
728 case Instruction::URem:
729 case Instruction::SRem:
730 case Instruction::FRem:
731 case Instruction::And:
732 case Instruction::Or:
733 case Instruction::Xor:
734 case Instruction::ICmp:
735 case Instruction::FCmp:
736 case Instruction::Shl:
737 case Instruction::LShr:
738 case Instruction::AShr:
741 bool NeedsClosingParens = printConstExprCast(CE);
742 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
743 switch (CE->getOpcode()) {
744 case Instruction::Add: Out << " + "; break;
745 case Instruction::Sub: Out << " - "; break;
746 case Instruction::Mul: Out << " * "; break;
747 case Instruction::URem:
748 case Instruction::SRem:
749 case Instruction::FRem: Out << " % "; break;
750 case Instruction::UDiv:
751 case Instruction::SDiv:
752 case Instruction::FDiv: Out << " / "; break;
753 case Instruction::And: Out << " & "; break;
754 case Instruction::Or: Out << " | "; break;
755 case Instruction::Xor: Out << " ^ "; break;
756 case Instruction::Shl: Out << " << "; break;
757 case Instruction::LShr:
758 case Instruction::AShr: Out << " >> "; break;
759 case Instruction::ICmp:
760 switch (CE->getPredicate()) {
761 case ICmpInst::ICMP_EQ: Out << " == "; break;
762 case ICmpInst::ICMP_NE: Out << " != "; break;
763 case ICmpInst::ICMP_SLT:
764 case ICmpInst::ICMP_ULT: Out << " < "; break;
765 case ICmpInst::ICMP_SLE:
766 case ICmpInst::ICMP_ULE: Out << " <= "; break;
767 case ICmpInst::ICMP_SGT:
768 case ICmpInst::ICMP_UGT: Out << " > "; break;
769 case ICmpInst::ICMP_SGE:
770 case ICmpInst::ICMP_UGE: Out << " >= "; break;
771 default: assert(0 && "Illegal ICmp predicate");
774 case Instruction::FCmp:
775 switch (CE->getPredicate()) {
776 case FCmpInst::FCMP_ORD:
777 case FCmpInst::FCMP_UEQ:
778 case FCmpInst::FCMP_OEQ: Out << " == "; break;
779 case FCmpInst::FCMP_UNO:
780 case FCmpInst::FCMP_UNE:
781 case FCmpInst::FCMP_ONE: Out << " != "; break;
782 case FCmpInst::FCMP_OLT:
783 case FCmpInst::FCMP_ULT: Out << " < "; break;
784 case FCmpInst::FCMP_OLE:
785 case FCmpInst::FCMP_ULE: Out << " <= "; break;
786 case FCmpInst::FCMP_OGT:
787 case FCmpInst::FCMP_UGT: Out << " > "; break;
788 case FCmpInst::FCMP_OGE:
789 case FCmpInst::FCMP_UGE: Out << " >= "; break;
790 default: assert(0 && "Illegal FCmp predicate");
793 default: assert(0 && "Illegal opcode here!");
795 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
796 if (NeedsClosingParens)
803 cerr << "CWriter Error: Unhandled constant expression: "
807 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
809 printType(Out, CPV->getType()); // sign doesn't matter
810 Out << ")/*UNDEF*/0)";
814 switch (CPV->getType()->getTypeID()) {
816 Out << (cast<ConstantBool>(CPV)->getValue() ? '1' : '0');
819 Out << "((char)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
821 case Type::Int16TyID:
822 Out << "((short)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
824 case Type::Int32TyID:
825 Out << "((int)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
827 case Type::Int64TyID:
828 Out << "((long long)" << cast<ConstantInt>(CPV)->getSExtValue() << "ll)";
831 case Type::FloatTyID:
832 case Type::DoubleTyID: {
833 ConstantFP *FPC = cast<ConstantFP>(CPV);
834 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
835 if (I != FPConstantMap.end()) {
836 // Because of FP precision problems we must load from a stack allocated
837 // value that holds the value in hex.
838 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
839 << "*)&FPConstant" << I->second << ')';
841 if (IsNAN(FPC->getValue())) {
844 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
846 const unsigned long QuietNaN = 0x7ff8UL;
847 //const unsigned long SignalNaN = 0x7ff4UL;
849 // We need to grab the first part of the FP #
852 uint64_t ll = DoubleToBits(FPC->getValue());
853 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
855 std::string Num(&Buffer[0], &Buffer[6]);
856 unsigned long Val = strtoul(Num.c_str(), 0, 16);
858 if (FPC->getType() == Type::FloatTy)
859 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
860 << Buffer << "\") /*nan*/ ";
862 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
863 << Buffer << "\") /*nan*/ ";
864 } else if (IsInf(FPC->getValue())) {
866 if (FPC->getValue() < 0) Out << '-';
867 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
871 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
872 // Print out the constant as a floating point number.
874 sprintf(Buffer, "%a", FPC->getValue());
877 Num = ftostr(FPC->getValue());
885 case Type::ArrayTyID:
886 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
887 const ArrayType *AT = cast<ArrayType>(CPV->getType());
889 if (AT->getNumElements()) {
891 Constant *CZ = Constant::getNullValue(AT->getElementType());
893 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
900 printConstantArray(cast<ConstantArray>(CPV));
904 case Type::PackedTyID:
905 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
906 const PackedType *AT = cast<PackedType>(CPV->getType());
908 if (AT->getNumElements()) {
910 Constant *CZ = Constant::getNullValue(AT->getElementType());
912 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
919 printConstantPacked(cast<ConstantPacked>(CPV));
923 case Type::StructTyID:
924 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
925 const StructType *ST = cast<StructType>(CPV->getType());
927 if (ST->getNumElements()) {
929 printConstant(Constant::getNullValue(ST->getElementType(0)));
930 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
932 printConstant(Constant::getNullValue(ST->getElementType(i)));
938 if (CPV->getNumOperands()) {
940 printConstant(cast<Constant>(CPV->getOperand(0)));
941 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
943 printConstant(cast<Constant>(CPV->getOperand(i)));
950 case Type::PointerTyID:
951 if (isa<ConstantPointerNull>(CPV)) {
953 printType(Out, CPV->getType()); // sign doesn't matter
954 Out << ")/*NULL*/0)";
956 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
962 cerr << "Unknown constant type: " << *CPV << "\n";
967 // Some constant expressions need to be casted back to the original types
968 // because their operands were casted to the expected type. This function takes
969 // care of detecting that case and printing the cast for the ConstantExpr.
970 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
971 bool NeedsExplicitCast = false;
972 const Type *Ty = CE->getOperand(0)->getType();
973 bool TypeIsSigned = false;
974 switch (CE->getOpcode()) {
975 case Instruction::LShr:
976 case Instruction::URem:
977 case Instruction::UDiv: NeedsExplicitCast = true; break;
978 case Instruction::AShr:
979 case Instruction::SRem:
980 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
981 case Instruction::SExt:
983 NeedsExplicitCast = true;
986 case Instruction::ZExt:
987 case Instruction::Trunc:
988 case Instruction::FPTrunc:
989 case Instruction::FPExt:
990 case Instruction::UIToFP:
991 case Instruction::SIToFP:
992 case Instruction::FPToUI:
993 case Instruction::FPToSI:
994 case Instruction::PtrToInt:
995 case Instruction::IntToPtr:
996 case Instruction::BitCast:
998 NeedsExplicitCast = true;
1002 if (NeedsExplicitCast) {
1004 if (Ty->isPrimitiveType())
1005 printPrimitiveType(Out, Ty, TypeIsSigned);
1010 return NeedsExplicitCast;
1013 // Print a constant assuming that it is the operand for a given Opcode. The
1014 // opcodes that care about sign need to cast their operands to the expected
1015 // type before the operation proceeds. This function does the casting.
1016 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1018 // Extract the operand's type, we'll need it.
1019 const Type* OpTy = CPV->getType();
1021 // Indicate whether to do the cast or not.
1022 bool shouldCast = false;
1023 bool typeIsSigned = false;
1025 // Based on the Opcode for which this Constant is being written, determine
1026 // the new type to which the operand should be casted by setting the value
1027 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1031 // for most instructions, it doesn't matter
1033 case Instruction::LShr:
1034 case Instruction::UDiv:
1035 case Instruction::URem:
1038 case Instruction::AShr:
1039 case Instruction::SDiv:
1040 case Instruction::SRem:
1042 typeIsSigned = true;
1046 // Write out the casted constant if we should, otherwise just write the
1050 printPrimitiveType(Out, OpTy, typeIsSigned);
1058 void CWriter::writeOperandInternal(Value *Operand) {
1059 if (Instruction *I = dyn_cast<Instruction>(Operand))
1060 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1061 // Should we inline this instruction to build a tree?
1068 Constant* CPV = dyn_cast<Constant>(Operand);
1069 if (CPV && !isa<GlobalValue>(CPV)) {
1072 Out << Mang->getValueName(Operand);
1076 void CWriter::writeOperandRaw(Value *Operand) {
1077 Constant* CPV = dyn_cast<Constant>(Operand);
1078 if (CPV && !isa<GlobalValue>(CPV)) {
1081 Out << Mang->getValueName(Operand);
1085 void CWriter::writeOperand(Value *Operand) {
1086 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1087 Out << "(&"; // Global variables are referenced as their addresses by llvm
1089 writeOperandInternal(Operand);
1091 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1095 // Some instructions need to have their result value casted back to the
1096 // original types because their operands were casted to the expected type.
1097 // This function takes care of detecting that case and printing the cast
1098 // for the Instruction.
1099 bool CWriter::writeInstructionCast(const Instruction &I) {
1100 const Type *Ty = I.getOperand(0)->getType();
1101 switch (I.getOpcode()) {
1102 case Instruction::LShr:
1103 case Instruction::URem:
1104 case Instruction::UDiv:
1106 printPrimitiveType(Out, Ty, false);
1109 case Instruction::AShr:
1110 case Instruction::SRem:
1111 case Instruction::SDiv:
1113 printPrimitiveType(Out, Ty, true);
1121 // Write the operand with a cast to another type based on the Opcode being used.
1122 // This will be used in cases where an instruction has specific type
1123 // requirements (usually signedness) for its operands.
1124 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1126 // Extract the operand's type, we'll need it.
1127 const Type* OpTy = Operand->getType();
1129 // Indicate whether to do the cast or not.
1130 bool shouldCast = false;
1132 // Indicate whether the cast should be to a signed type or not.
1133 bool castIsSigned = false;
1135 // Based on the Opcode for which this Operand is being written, determine
1136 // the new type to which the operand should be casted by setting the value
1137 // of OpTy. If we change OpTy, also set shouldCast to true.
1140 // for most instructions, it doesn't matter
1142 case Instruction::LShr:
1143 case Instruction::UDiv:
1144 case Instruction::URem: // Cast to unsigned first
1146 castIsSigned = false;
1148 case Instruction::AShr:
1149 case Instruction::SDiv:
1150 case Instruction::SRem: // Cast to signed first
1152 castIsSigned = true;
1156 // Write out the casted operand if we should, otherwise just write the
1160 printPrimitiveType(Out, OpTy, castIsSigned);
1162 writeOperand(Operand);
1165 writeOperand(Operand);
1168 // Write the operand with a cast to another type based on the icmp predicate
1170 void CWriter::writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate) {
1172 // Extract the operand's type, we'll need it.
1173 const Type* OpTy = Operand->getType();
1175 // Indicate whether to do the cast or not.
1176 bool shouldCast = false;
1178 // Indicate whether the cast should be to a signed type or not.
1179 bool castIsSigned = false;
1181 // Based on the Opcode for which this Operand is being written, determine
1182 // the new type to which the operand should be casted by setting the value
1183 // of OpTy. If we change OpTy, also set shouldCast to true.
1184 switch (predicate) {
1186 // for eq and ne, it doesn't matter
1188 case ICmpInst::ICMP_UGT:
1189 case ICmpInst::ICMP_UGE:
1190 case ICmpInst::ICMP_ULT:
1191 case ICmpInst::ICMP_ULE:
1194 case ICmpInst::ICMP_SGT:
1195 case ICmpInst::ICMP_SGE:
1196 case ICmpInst::ICMP_SLT:
1197 case ICmpInst::ICMP_SLE:
1199 castIsSigned = true;
1203 // Write out the casted operand if we should, otherwise just write the
1207 if (OpTy->isPrimitiveType())
1208 printPrimitiveType(Out, OpTy, castIsSigned);
1210 printType(Out, OpTy);
1212 writeOperand(Operand);
1215 writeOperand(Operand);
1218 // generateCompilerSpecificCode - This is where we add conditional compilation
1219 // directives to cater to specific compilers as need be.
1221 static void generateCompilerSpecificCode(std::ostream& Out) {
1222 // Alloca is hard to get, and we don't want to include stdlib.h here.
1223 Out << "/* get a declaration for alloca */\n"
1224 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1225 << "extern void *_alloca(unsigned long);\n"
1226 << "#define alloca(x) _alloca(x)\n"
1227 << "#elif defined(__APPLE__)\n"
1228 << "extern void *__builtin_alloca(unsigned long);\n"
1229 << "#define alloca(x) __builtin_alloca(x)\n"
1230 << "#define longjmp _longjmp\n"
1231 << "#define setjmp _setjmp\n"
1232 << "#elif defined(__sun__)\n"
1233 << "#if defined(__sparcv9)\n"
1234 << "extern void *__builtin_alloca(unsigned long);\n"
1236 << "extern void *__builtin_alloca(unsigned int);\n"
1238 << "#define alloca(x) __builtin_alloca(x)\n"
1239 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1240 << "#define alloca(x) __builtin_alloca(x)\n"
1241 << "#elif !defined(_MSC_VER)\n"
1242 << "#include <alloca.h>\n"
1245 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1246 // If we aren't being compiled with GCC, just drop these attributes.
1247 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1248 << "#define __attribute__(X)\n"
1251 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1252 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1253 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1254 << "#elif defined(__GNUC__)\n"
1255 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1257 << "#define __EXTERNAL_WEAK__\n"
1260 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1261 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1262 << "#define __ATTRIBUTE_WEAK__\n"
1263 << "#elif defined(__GNUC__)\n"
1264 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1266 << "#define __ATTRIBUTE_WEAK__\n"
1269 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1270 // From the GCC documentation:
1272 // double __builtin_nan (const char *str)
1274 // This is an implementation of the ISO C99 function nan.
1276 // Since ISO C99 defines this function in terms of strtod, which we do
1277 // not implement, a description of the parsing is in order. The string is
1278 // parsed as by strtol; that is, the base is recognized by leading 0 or
1279 // 0x prefixes. The number parsed is placed in the significand such that
1280 // the least significant bit of the number is at the least significant
1281 // bit of the significand. The number is truncated to fit the significand
1282 // field provided. The significand is forced to be a quiet NaN.
1284 // This function, if given a string literal, is evaluated early enough
1285 // that it is considered a compile-time constant.
1287 // float __builtin_nanf (const char *str)
1289 // Similar to __builtin_nan, except the return type is float.
1291 // double __builtin_inf (void)
1293 // Similar to __builtin_huge_val, except a warning is generated if the
1294 // target floating-point format does not support infinities. This
1295 // function is suitable for implementing the ISO C99 macro INFINITY.
1297 // float __builtin_inff (void)
1299 // Similar to __builtin_inf, except the return type is float.
1300 Out << "#ifdef __GNUC__\n"
1301 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1302 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1303 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1304 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1305 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1306 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1307 << "#define LLVM_PREFETCH(addr,rw,locality) "
1308 "__builtin_prefetch(addr,rw,locality)\n"
1309 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1310 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1311 << "#define LLVM_ASM __asm__\n"
1313 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1314 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1315 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1316 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1317 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1318 << "#define LLVM_INFF 0.0F /* Float */\n"
1319 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1320 << "#define __ATTRIBUTE_CTOR__\n"
1321 << "#define __ATTRIBUTE_DTOR__\n"
1322 << "#define LLVM_ASM(X)\n"
1325 // Output target-specific code that should be inserted into main.
1326 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1327 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1328 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1329 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1330 << "defined(__x86_64__)\n"
1331 << "#undef CODE_FOR_MAIN\n"
1332 << "#define CODE_FOR_MAIN() \\\n"
1333 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1334 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1335 << "#endif\n#endif\n";
1339 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1340 /// the StaticTors set.
1341 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1342 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1343 if (!InitList) return;
1345 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1346 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1347 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1349 if (CS->getOperand(1)->isNullValue())
1350 return; // Found a null terminator, exit printing.
1351 Constant *FP = CS->getOperand(1);
1352 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1354 FP = CE->getOperand(0);
1355 if (Function *F = dyn_cast<Function>(FP))
1356 StaticTors.insert(F);
1360 enum SpecialGlobalClass {
1362 GlobalCtors, GlobalDtors,
1366 /// getGlobalVariableClass - If this is a global that is specially recognized
1367 /// by LLVM, return a code that indicates how we should handle it.
1368 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1369 // If this is a global ctors/dtors list, handle it now.
1370 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1371 if (GV->getName() == "llvm.global_ctors")
1373 else if (GV->getName() == "llvm.global_dtors")
1377 // Otherwise, it it is other metadata, don't print it. This catches things
1378 // like debug information.
1379 if (GV->getSection() == "llvm.metadata")
1386 bool CWriter::doInitialization(Module &M) {
1390 IL.AddPrototypes(M);
1392 // Ensure that all structure types have names...
1393 Mang = new Mangler(M);
1394 Mang->markCharUnacceptable('.');
1396 // Keep track of which functions are static ctors/dtors so they can have
1397 // an attribute added to their prototypes.
1398 std::set<Function*> StaticCtors, StaticDtors;
1399 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1401 switch (getGlobalVariableClass(I)) {
1404 FindStaticTors(I, StaticCtors);
1407 FindStaticTors(I, StaticDtors);
1412 // get declaration for alloca
1413 Out << "/* Provide Declarations */\n";
1414 Out << "#include <stdarg.h>\n"; // Varargs support
1415 Out << "#include <setjmp.h>\n"; // Unwind support
1416 generateCompilerSpecificCode(Out);
1418 // Provide a definition for `bool' if not compiling with a C++ compiler.
1420 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1422 << "\n\n/* Support for floating point constants */\n"
1423 << "typedef unsigned long long ConstantDoubleTy;\n"
1424 << "typedef unsigned int ConstantFloatTy;\n"
1426 << "\n\n/* Global Declarations */\n";
1428 // First output all the declarations for the program, because C requires
1429 // Functions & globals to be declared before they are used.
1432 // Loop over the symbol table, emitting all named constants...
1433 printModuleTypes(M.getTypeSymbolTable());
1435 // Global variable declarations...
1436 if (!M.global_empty()) {
1437 Out << "\n/* External Global Variable Declarations */\n";
1438 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1440 if (I->hasExternalLinkage()) {
1442 printType(Out, I->getType()->getElementType(), true,
1443 Mang->getValueName(I));
1445 } else if (I->hasDLLImportLinkage()) {
1446 Out << "__declspec(dllimport) ";
1447 printType(Out, I->getType()->getElementType(), true,
1448 Mang->getValueName(I));
1450 } else if (I->hasExternalWeakLinkage()) {
1452 printType(Out, I->getType()->getElementType(), true,
1453 Mang->getValueName(I));
1454 Out << " __EXTERNAL_WEAK__ ;\n";
1459 // Function declarations
1460 Out << "\n/* Function Declarations */\n";
1461 Out << "double fmod(double, double);\n"; // Support for FP rem
1462 Out << "float fmodf(float, float);\n";
1464 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1465 // Don't print declarations for intrinsic functions.
1466 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1467 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1468 if (I->hasExternalWeakLinkage())
1470 printFunctionSignature(I, true);
1471 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1472 Out << " __ATTRIBUTE_WEAK__";
1473 if (I->hasExternalWeakLinkage())
1474 Out << " __EXTERNAL_WEAK__";
1475 if (StaticCtors.count(I))
1476 Out << " __ATTRIBUTE_CTOR__";
1477 if (StaticDtors.count(I))
1478 Out << " __ATTRIBUTE_DTOR__";
1480 if (I->hasName() && I->getName()[0] == 1)
1481 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1487 // Output the global variable declarations
1488 if (!M.global_empty()) {
1489 Out << "\n\n/* Global Variable Declarations */\n";
1490 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1492 if (!I->isExternal()) {
1493 // Ignore special globals, such as debug info.
1494 if (getGlobalVariableClass(I))
1497 if (I->hasInternalLinkage())
1501 printType(Out, I->getType()->getElementType(), true,
1502 Mang->getValueName(I));
1504 if (I->hasLinkOnceLinkage())
1505 Out << " __attribute__((common))";
1506 else if (I->hasWeakLinkage())
1507 Out << " __ATTRIBUTE_WEAK__";
1508 else if (I->hasExternalWeakLinkage())
1509 Out << " __EXTERNAL_WEAK__";
1514 // Output the global variable definitions and contents...
1515 if (!M.global_empty()) {
1516 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1517 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1519 if (!I->isExternal()) {
1520 // Ignore special globals, such as debug info.
1521 if (getGlobalVariableClass(I))
1524 if (I->hasInternalLinkage())
1526 else if (I->hasDLLImportLinkage())
1527 Out << "__declspec(dllimport) ";
1528 else if (I->hasDLLExportLinkage())
1529 Out << "__declspec(dllexport) ";
1531 printType(Out, I->getType()->getElementType(), true,
1532 Mang->getValueName(I));
1533 if (I->hasLinkOnceLinkage())
1534 Out << " __attribute__((common))";
1535 else if (I->hasWeakLinkage())
1536 Out << " __ATTRIBUTE_WEAK__";
1538 // If the initializer is not null, emit the initializer. If it is null,
1539 // we try to avoid emitting large amounts of zeros. The problem with
1540 // this, however, occurs when the variable has weak linkage. In this
1541 // case, the assembler will complain about the variable being both weak
1542 // and common, so we disable this optimization.
1543 if (!I->getInitializer()->isNullValue()) {
1545 writeOperand(I->getInitializer());
1546 } else if (I->hasWeakLinkage()) {
1547 // We have to specify an initializer, but it doesn't have to be
1548 // complete. If the value is an aggregate, print out { 0 }, and let
1549 // the compiler figure out the rest of the zeros.
1551 if (isa<StructType>(I->getInitializer()->getType()) ||
1552 isa<ArrayType>(I->getInitializer()->getType()) ||
1553 isa<PackedType>(I->getInitializer()->getType())) {
1556 // Just print it out normally.
1557 writeOperand(I->getInitializer());
1565 Out << "\n\n/* Function Bodies */\n";
1570 /// Output all floating point constants that cannot be printed accurately...
1571 void CWriter::printFloatingPointConstants(Function &F) {
1572 // Scan the module for floating point constants. If any FP constant is used
1573 // in the function, we want to redirect it here so that we do not depend on
1574 // the precision of the printed form, unless the printed form preserves
1577 static unsigned FPCounter = 0;
1578 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1580 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1581 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1582 !FPConstantMap.count(FPC)) {
1583 double Val = FPC->getValue();
1585 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1587 if (FPC->getType() == Type::DoubleTy) {
1588 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1589 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1590 << "ULL; /* " << Val << " */\n";
1591 } else if (FPC->getType() == Type::FloatTy) {
1592 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1593 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1594 << "U; /* " << Val << " */\n";
1596 assert(0 && "Unknown float type!");
1603 /// printSymbolTable - Run through symbol table looking for type names. If a
1604 /// type name is found, emit its declaration...
1606 void CWriter::printModuleTypes(const TypeSymbolTable &TST) {
1607 Out << "/* Helper union for bitcasts */\n";
1608 Out << "typedef union {\n";
1609 Out << " unsigned int Int32;\n";
1610 Out << " unsigned long long Int64;\n";
1611 Out << " float Float;\n";
1612 Out << " double Double;\n";
1613 Out << "} llvmBitCastUnion;\n";
1615 // We are only interested in the type plane of the symbol table.
1616 TypeSymbolTable::const_iterator I = TST.begin();
1617 TypeSymbolTable::const_iterator End = TST.end();
1619 // If there are no type names, exit early.
1620 if (I == End) return;
1622 // Print out forward declarations for structure types before anything else!
1623 Out << "/* Structure forward decls */\n";
1624 for (; I != End; ++I)
1625 if (const Type *STy = dyn_cast<StructType>(I->second)) {
1626 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1627 Out << Name << ";\n";
1628 TypeNames.insert(std::make_pair(STy, Name));
1633 // Now we can print out typedefs...
1634 Out << "/* Typedefs */\n";
1635 for (I = TST.begin(); I != End; ++I) {
1636 const Type *Ty = cast<Type>(I->second);
1637 std::string Name = "l_" + Mang->makeNameProper(I->first);
1639 printType(Out, Ty, true, Name);
1645 // Keep track of which structures have been printed so far...
1646 std::set<const StructType *> StructPrinted;
1648 // Loop over all structures then push them into the stack so they are
1649 // printed in the correct order.
1651 Out << "/* Structure contents */\n";
1652 for (I = TST.begin(); I != End; ++I)
1653 if (const StructType *STy = dyn_cast<StructType>(I->second))
1654 // Only print out used types!
1655 printContainedStructs(STy, StructPrinted);
1658 // Push the struct onto the stack and recursively push all structs
1659 // this one depends on.
1661 // TODO: Make this work properly with packed types
1663 void CWriter::printContainedStructs(const Type *Ty,
1664 std::set<const StructType*> &StructPrinted){
1665 // Don't walk through pointers.
1666 if (isa<PointerType>(Ty) || Ty->isPrimitiveType()) return;
1668 // Print all contained types first.
1669 for (Type::subtype_iterator I = Ty->subtype_begin(),
1670 E = Ty->subtype_end(); I != E; ++I)
1671 printContainedStructs(*I, StructPrinted);
1673 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1674 // Check to see if we have already printed this struct.
1675 if (StructPrinted.insert(STy).second) {
1676 // Print structure type out.
1677 std::string Name = TypeNames[STy];
1678 printType(Out, STy, true, Name, true);
1684 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1685 /// isCStructReturn - Should this function actually return a struct by-value?
1686 bool isCStructReturn = F->getCallingConv() == CallingConv::CSRet;
1688 if (F->hasInternalLinkage()) Out << "static ";
1689 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1690 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1691 switch (F->getCallingConv()) {
1692 case CallingConv::X86_StdCall:
1693 Out << "__stdcall ";
1695 case CallingConv::X86_FastCall:
1696 Out << "__fastcall ";
1700 // Loop over the arguments, printing them...
1701 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1703 std::stringstream FunctionInnards;
1705 // Print out the name...
1706 FunctionInnards << Mang->getValueName(F) << '(';
1708 bool PrintedArg = false;
1709 if (!F->isExternal()) {
1710 if (!F->arg_empty()) {
1711 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1713 // If this is a struct-return function, don't print the hidden
1714 // struct-return argument.
1715 if (isCStructReturn) {
1716 assert(I != E && "Invalid struct return function!");
1720 std::string ArgName;
1722 for (; I != E; ++I) {
1723 if (PrintedArg) FunctionInnards << ", ";
1724 if (I->hasName() || !Prototype)
1725 ArgName = Mang->getValueName(I);
1728 printType(FunctionInnards, I->getType(),
1729 /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute),
1736 // Loop over the arguments, printing them.
1737 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1739 // If this is a struct-return function, don't print the hidden
1740 // struct-return argument.
1741 if (isCStructReturn) {
1742 assert(I != E && "Invalid struct return function!");
1747 for (; I != E; ++I) {
1748 if (PrintedArg) FunctionInnards << ", ";
1749 printType(FunctionInnards, *I,
1750 /*isSigned=*/FT->paramHasAttr(Idx, FunctionType::SExtAttribute));
1756 // Finish printing arguments... if this is a vararg function, print the ...,
1757 // unless there are no known types, in which case, we just emit ().
1759 if (FT->isVarArg() && PrintedArg) {
1760 if (PrintedArg) FunctionInnards << ", ";
1761 FunctionInnards << "..."; // Output varargs portion of signature!
1762 } else if (!FT->isVarArg() && !PrintedArg) {
1763 FunctionInnards << "void"; // ret() -> ret(void) in C.
1765 FunctionInnards << ')';
1767 // Get the return tpe for the function.
1769 if (!isCStructReturn)
1770 RetTy = F->getReturnType();
1772 // If this is a struct-return function, print the struct-return type.
1773 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1776 // Print out the return type and the signature built above.
1777 printType(Out, RetTy, FT->paramHasAttr(0, FunctionType::SExtAttribute),
1778 FunctionInnards.str());
1781 static inline bool isFPIntBitCast(const Instruction &I) {
1782 if (!isa<BitCastInst>(I))
1784 const Type *SrcTy = I.getOperand(0)->getType();
1785 const Type *DstTy = I.getType();
1786 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1787 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1790 void CWriter::printFunction(Function &F) {
1791 printFunctionSignature(&F, false);
1794 // If this is a struct return function, handle the result with magic.
1795 if (F.getCallingConv() == CallingConv::CSRet) {
1796 const Type *StructTy =
1797 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1799 printType(Out, StructTy, true, "StructReturn");
1800 Out << "; /* Struct return temporary */\n";
1803 printType(Out, F.arg_begin()->getType(), true,
1804 Mang->getValueName(F.arg_begin()));
1805 Out << " = &StructReturn;\n";
1808 bool PrintedVar = false;
1810 // print local variable information for the function
1811 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1812 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1814 printType(Out, AI->getAllocatedType(), true, Mang->getValueName(AI));
1815 Out << "; /* Address-exposed local */\n";
1817 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1819 printType(Out, I->getType(), true, Mang->getValueName(&*I));
1822 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1824 printType(Out, I->getType(), true,
1825 Mang->getValueName(&*I)+"__PHI_TEMPORARY");
1830 // We need a temporary for the BitCast to use so it can pluck a value out
1831 // of a union to do the BitCast. This is separate from the need for a
1832 // variable to hold the result of the BitCast.
1833 if (isFPIntBitCast(*I)) {
1834 Out << " llvmBitCastUnion " << Mang->getValueName(&*I)
1835 << "__BITCAST_TEMPORARY;\n";
1843 if (F.hasExternalLinkage() && F.getName() == "main")
1844 Out << " CODE_FOR_MAIN();\n";
1846 // print the basic blocks
1847 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1848 if (Loop *L = LI->getLoopFor(BB)) {
1849 if (L->getHeader() == BB && L->getParentLoop() == 0)
1852 printBasicBlock(BB);
1859 void CWriter::printLoop(Loop *L) {
1860 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1861 << "' to make GCC happy */\n";
1862 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1863 BasicBlock *BB = L->getBlocks()[i];
1864 Loop *BBLoop = LI->getLoopFor(BB);
1866 printBasicBlock(BB);
1867 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
1870 Out << " } while (1); /* end of syntactic loop '"
1871 << L->getHeader()->getName() << "' */\n";
1874 void CWriter::printBasicBlock(BasicBlock *BB) {
1876 // Don't print the label for the basic block if there are no uses, or if
1877 // the only terminator use is the predecessor basic block's terminator.
1878 // We have to scan the use list because PHI nodes use basic blocks too but
1879 // do not require a label to be generated.
1881 bool NeedsLabel = false;
1882 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
1883 if (isGotoCodeNecessary(*PI, BB)) {
1888 if (NeedsLabel) Out << Mang->getValueName(BB) << ":\n";
1890 // Output all of the instructions in the basic block...
1891 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
1893 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
1894 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
1903 // Don't emit prefix or suffix for the terminator...
1904 visit(*BB->getTerminator());
1908 // Specific Instruction type classes... note that all of the casts are
1909 // necessary because we use the instruction classes as opaque types...
1911 void CWriter::visitReturnInst(ReturnInst &I) {
1912 // If this is a struct return function, return the temporary struct.
1913 if (I.getParent()->getParent()->getCallingConv() == CallingConv::CSRet) {
1914 Out << " return StructReturn;\n";
1918 // Don't output a void return if this is the last basic block in the function
1919 if (I.getNumOperands() == 0 &&
1920 &*--I.getParent()->getParent()->end() == I.getParent() &&
1921 !I.getParent()->size() == 1) {
1926 if (I.getNumOperands()) {
1928 writeOperand(I.getOperand(0));
1933 void CWriter::visitSwitchInst(SwitchInst &SI) {
1936 writeOperand(SI.getOperand(0));
1937 Out << ") {\n default:\n";
1938 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
1939 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
1941 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
1943 writeOperand(SI.getOperand(i));
1945 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
1946 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
1947 printBranchToBlock(SI.getParent(), Succ, 2);
1948 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
1954 void CWriter::visitUnreachableInst(UnreachableInst &I) {
1955 Out << " /*UNREACHABLE*/;\n";
1958 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
1959 /// FIXME: This should be reenabled, but loop reordering safe!!
1962 if (next(Function::iterator(From)) != Function::iterator(To))
1963 return true; // Not the direct successor, we need a goto.
1965 //isa<SwitchInst>(From->getTerminator())
1967 if (LI->getLoopFor(From) != LI->getLoopFor(To))
1972 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
1973 BasicBlock *Successor,
1975 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
1976 PHINode *PN = cast<PHINode>(I);
1977 // Now we have to do the printing.
1978 Value *IV = PN->getIncomingValueForBlock(CurBlock);
1979 if (!isa<UndefValue>(IV)) {
1980 Out << std::string(Indent, ' ');
1981 Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = ";
1983 Out << "; /* for PHI node */\n";
1988 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
1990 if (isGotoCodeNecessary(CurBB, Succ)) {
1991 Out << std::string(Indent, ' ') << " goto ";
1997 // Branch instruction printing - Avoid printing out a branch to a basic block
1998 // that immediately succeeds the current one.
2000 void CWriter::visitBranchInst(BranchInst &I) {
2002 if (I.isConditional()) {
2003 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2005 writeOperand(I.getCondition());
2008 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2009 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2011 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2012 Out << " } else {\n";
2013 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2014 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2017 // First goto not necessary, assume second one is...
2019 writeOperand(I.getCondition());
2022 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2023 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2028 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2029 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2034 // PHI nodes get copied into temporary values at the end of predecessor basic
2035 // blocks. We now need to copy these temporary values into the REAL value for
2037 void CWriter::visitPHINode(PHINode &I) {
2039 Out << "__PHI_TEMPORARY";
2043 void CWriter::visitBinaryOperator(Instruction &I) {
2044 // binary instructions, shift instructions, setCond instructions.
2045 assert(!isa<PointerType>(I.getType()));
2047 // We must cast the results of binary operations which might be promoted.
2048 bool needsCast = false;
2049 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2050 || (I.getType() == Type::FloatTy)) {
2053 printType(Out, I.getType());
2057 // If this is a negation operation, print it out as such. For FP, we don't
2058 // want to print "-0.0 - X".
2059 if (BinaryOperator::isNeg(&I)) {
2061 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2063 } else if (I.getOpcode() == Instruction::FRem) {
2064 // Output a call to fmod/fmodf instead of emitting a%b
2065 if (I.getType() == Type::FloatTy)
2069 writeOperand(I.getOperand(0));
2071 writeOperand(I.getOperand(1));
2075 // Write out the cast of the instruction's value back to the proper type
2077 bool NeedsClosingParens = writeInstructionCast(I);
2079 // Certain instructions require the operand to be forced to a specific type
2080 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2081 // below for operand 1
2082 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2084 switch (I.getOpcode()) {
2085 case Instruction::Add: Out << " + "; break;
2086 case Instruction::Sub: Out << " - "; break;
2087 case Instruction::Mul: Out << '*'; break;
2088 case Instruction::URem:
2089 case Instruction::SRem:
2090 case Instruction::FRem: Out << '%'; break;
2091 case Instruction::UDiv:
2092 case Instruction::SDiv:
2093 case Instruction::FDiv: Out << '/'; break;
2094 case Instruction::And: Out << " & "; break;
2095 case Instruction::Or: Out << " | "; break;
2096 case Instruction::Xor: Out << " ^ "; break;
2097 case Instruction::Shl : Out << " << "; break;
2098 case Instruction::LShr:
2099 case Instruction::AShr: Out << " >> "; break;
2100 default: cerr << "Invalid operator type!" << I; abort();
2103 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2104 if (NeedsClosingParens)
2113 void CWriter::visitICmpInst(ICmpInst &I) {
2114 // We must cast the results of icmp which might be promoted.
2115 bool needsCast = false;
2117 // Write out the cast of the instruction's value back to the proper type
2119 bool NeedsClosingParens = writeInstructionCast(I);
2121 // Certain icmp predicate require the operand to be forced to a specific type
2122 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2123 // below for operand 1
2124 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2126 switch (I.getPredicate()) {
2127 case ICmpInst::ICMP_EQ: Out << " == "; break;
2128 case ICmpInst::ICMP_NE: Out << " != "; break;
2129 case ICmpInst::ICMP_ULE:
2130 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2131 case ICmpInst::ICMP_UGE:
2132 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2133 case ICmpInst::ICMP_ULT:
2134 case ICmpInst::ICMP_SLT: Out << " < "; break;
2135 case ICmpInst::ICMP_UGT:
2136 case ICmpInst::ICMP_SGT: Out << " > "; break;
2137 default: cerr << "Invalid icmp predicate!" << I; abort();
2140 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2141 if (NeedsClosingParens)
2149 void CWriter::visitFCmpInst(FCmpInst &I) {
2150 // Write the first operand
2151 writeOperand(I.getOperand(0));
2153 // Write the predicate
2154 switch (I.getPredicate()) {
2155 case FCmpInst::FCMP_FALSE: Out << " 0 "; break;
2156 case FCmpInst::FCMP_ORD:
2157 case FCmpInst::FCMP_OEQ:
2158 case FCmpInst::FCMP_UEQ: Out << " == "; break;
2159 case FCmpInst::FCMP_UNO:
2160 case FCmpInst::FCMP_ONE:
2161 case FCmpInst::FCMP_UNE: Out << " != "; break;
2162 case FCmpInst::FCMP_ULE:
2163 case FCmpInst::FCMP_OLE: Out << " <= "; break;
2164 case FCmpInst::FCMP_UGE:
2165 case FCmpInst::FCMP_OGE: Out << " >= "; break;
2166 case FCmpInst::FCMP_ULT:
2167 case FCmpInst::FCMP_OLT: Out << " < "; break;
2168 case FCmpInst::FCMP_UGT:
2169 case FCmpInst::FCMP_OGT: Out << " > "; break;
2170 case FCmpInst::FCMP_TRUE: Out << " 1 "; break;
2171 default: cerr << "Invalid fcmp predicate!" << I; abort();
2173 // Write the second operand
2174 writeOperand(I.getOperand(1));
2177 static const char * getFloatBitCastField(const Type *Ty) {
2178 switch (Ty->getTypeID()) {
2179 default: assert(0 && "Invalid Type");
2180 case Type::FloatTyID: return "Float";
2181 case Type::Int32TyID: return "Int32";
2182 case Type::DoubleTyID: return "Double";
2183 case Type::Int64TyID: return "Int64";
2187 void CWriter::visitCastInst(CastInst &I) {
2188 const Type *DstTy = I.getType();
2189 const Type *SrcTy = I.getOperand(0)->getType();
2191 if (isFPIntBitCast(I)) {
2192 // These int<->float and long<->double casts need to be handled specially
2193 Out << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2194 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2195 writeOperand(I.getOperand(0));
2196 Out << ", " << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2197 << getFloatBitCastField(I.getType());
2199 printCast(I.getOpcode(), SrcTy, DstTy);
2200 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::BoolTy) {
2201 // Make sure we really get a sext from bool by subtracing the bool from 0
2204 writeOperand(I.getOperand(0));
2205 if (DstTy == Type::BoolTy &&
2206 (I.getOpcode() == Instruction::Trunc ||
2207 I.getOpcode() == Instruction::FPToUI ||
2208 I.getOpcode() == Instruction::FPToSI ||
2209 I.getOpcode() == Instruction::PtrToInt)) {
2210 // Make sure we really get a trunc to bool by anding the operand with 1
2217 void CWriter::visitSelectInst(SelectInst &I) {
2219 writeOperand(I.getCondition());
2221 writeOperand(I.getTrueValue());
2223 writeOperand(I.getFalseValue());
2228 void CWriter::lowerIntrinsics(Function &F) {
2229 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2230 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2231 if (CallInst *CI = dyn_cast<CallInst>(I++))
2232 if (Function *F = CI->getCalledFunction())
2233 switch (F->getIntrinsicID()) {
2234 case Intrinsic::not_intrinsic:
2235 case Intrinsic::vastart:
2236 case Intrinsic::vacopy:
2237 case Intrinsic::vaend:
2238 case Intrinsic::returnaddress:
2239 case Intrinsic::frameaddress:
2240 case Intrinsic::setjmp:
2241 case Intrinsic::longjmp:
2242 case Intrinsic::prefetch:
2243 case Intrinsic::dbg_stoppoint:
2244 case Intrinsic::powi_f32:
2245 case Intrinsic::powi_f64:
2246 // We directly implement these intrinsics
2249 // If this is an intrinsic that directly corresponds to a GCC
2250 // builtin, we handle it.
2251 const char *BuiltinName = "";
2252 #define GET_GCC_BUILTIN_NAME
2253 #include "llvm/Intrinsics.gen"
2254 #undef GET_GCC_BUILTIN_NAME
2255 // If we handle it, don't lower it.
2256 if (BuiltinName[0]) break;
2258 // All other intrinsic calls we must lower.
2259 Instruction *Before = 0;
2260 if (CI != &BB->front())
2261 Before = prior(BasicBlock::iterator(CI));
2263 IL.LowerIntrinsicCall(CI);
2264 if (Before) { // Move iterator to instruction after call
2275 void CWriter::visitCallInst(CallInst &I) {
2276 //check if we have inline asm
2277 if (isInlineAsm(I)) {
2282 bool WroteCallee = false;
2284 // Handle intrinsic function calls first...
2285 if (Function *F = I.getCalledFunction())
2286 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2289 // If this is an intrinsic that directly corresponds to a GCC
2290 // builtin, we emit it here.
2291 const char *BuiltinName = "";
2292 #define GET_GCC_BUILTIN_NAME
2293 #include "llvm/Intrinsics.gen"
2294 #undef GET_GCC_BUILTIN_NAME
2295 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2301 case Intrinsic::vastart:
2304 Out << "va_start(*(va_list*)";
2305 writeOperand(I.getOperand(1));
2307 // Output the last argument to the enclosing function...
2308 if (I.getParent()->getParent()->arg_empty()) {
2309 cerr << "The C backend does not currently support zero "
2310 << "argument varargs functions, such as '"
2311 << I.getParent()->getParent()->getName() << "'!\n";
2314 writeOperand(--I.getParent()->getParent()->arg_end());
2317 case Intrinsic::vaend:
2318 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2319 Out << "0; va_end(*(va_list*)";
2320 writeOperand(I.getOperand(1));
2323 Out << "va_end(*(va_list*)0)";
2326 case Intrinsic::vacopy:
2328 Out << "va_copy(*(va_list*)";
2329 writeOperand(I.getOperand(1));
2330 Out << ", *(va_list*)";
2331 writeOperand(I.getOperand(2));
2334 case Intrinsic::returnaddress:
2335 Out << "__builtin_return_address(";
2336 writeOperand(I.getOperand(1));
2339 case Intrinsic::frameaddress:
2340 Out << "__builtin_frame_address(";
2341 writeOperand(I.getOperand(1));
2344 case Intrinsic::powi_f32:
2345 case Intrinsic::powi_f64:
2346 Out << "__builtin_powi(";
2347 writeOperand(I.getOperand(1));
2349 writeOperand(I.getOperand(2));
2352 case Intrinsic::setjmp:
2353 Out << "setjmp(*(jmp_buf*)";
2354 writeOperand(I.getOperand(1));
2357 case Intrinsic::longjmp:
2358 Out << "longjmp(*(jmp_buf*)";
2359 writeOperand(I.getOperand(1));
2361 writeOperand(I.getOperand(2));
2364 case Intrinsic::prefetch:
2365 Out << "LLVM_PREFETCH((const void *)";
2366 writeOperand(I.getOperand(1));
2368 writeOperand(I.getOperand(2));
2370 writeOperand(I.getOperand(3));
2373 case Intrinsic::dbg_stoppoint: {
2374 // If we use writeOperand directly we get a "u" suffix which is rejected
2376 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2380 << " \"" << SPI.getDirectory()
2381 << SPI.getFileName() << "\"\n";
2387 Value *Callee = I.getCalledValue();
2389 // If this is a call to a struct-return function, assign to the first
2390 // parameter instead of passing it to the call.
2391 bool isStructRet = I.getCallingConv() == CallingConv::CSRet;
2394 writeOperand(I.getOperand(1));
2398 if (I.isTailCall()) Out << " /*tail*/ ";
2400 const PointerType *PTy = cast<PointerType>(Callee->getType());
2401 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2404 // If this is an indirect call to a struct return function, we need to cast
2406 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2408 // GCC is a real PITA. It does not permit codegening casts of functions to
2409 // function pointers if they are in a call (it generates a trap instruction
2410 // instead!). We work around this by inserting a cast to void* in between
2411 // the function and the function pointer cast. Unfortunately, we can't just
2412 // form the constant expression here, because the folder will immediately
2415 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2416 // that void* and function pointers have the same size. :( To deal with this
2417 // in the common case, we handle casts where the number of arguments passed
2420 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2422 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2428 // Ok, just cast the pointer type.
2431 printType(Out, I.getCalledValue()->getType());
2433 printStructReturnPointerFunctionType(Out,
2434 cast<PointerType>(I.getCalledValue()->getType()));
2437 writeOperand(Callee);
2438 if (NeedsCast) Out << ')';
2443 unsigned NumDeclaredParams = FTy->getNumParams();
2445 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2447 if (isStructRet) { // Skip struct return argument.
2452 bool PrintedArg = false;
2454 for (; AI != AE; ++AI, ++ArgNo, ++Idx) {
2455 if (PrintedArg) Out << ", ";
2456 if (ArgNo < NumDeclaredParams &&
2457 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2459 printType(Out, FTy->getParamType(ArgNo),
2460 /*isSigned=*/FTy->paramHasAttr(Idx, FunctionType::SExtAttribute));
2470 //This converts the llvm constraint string to something gcc is expecting.
2471 //TODO: work out platform independent constraints and factor those out
2472 // of the per target tables
2473 // handle multiple constraint codes
2474 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2476 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2478 const char** table = 0;
2480 //Grab the translation table from TargetAsmInfo if it exists
2483 const TargetMachineRegistry::Entry* Match =
2484 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2486 //Per platform Target Machines don't exist, so create it
2487 // this must be done only once
2488 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2489 TAsm = TM->getTargetAsmInfo();
2493 table = TAsm->getAsmCBE();
2495 //Search the translation table if it exists
2496 for (int i = 0; table && table[i]; i += 2)
2497 if (c.Codes[0] == table[i])
2500 //default is identity
2504 //TODO: import logic from AsmPrinter.cpp
2505 static std::string gccifyAsm(std::string asmstr) {
2506 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2507 if (asmstr[i] == '\n')
2508 asmstr.replace(i, 1, "\\n");
2509 else if (asmstr[i] == '\t')
2510 asmstr.replace(i, 1, "\\t");
2511 else if (asmstr[i] == '$') {
2512 if (asmstr[i + 1] == '{') {
2513 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2514 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2515 std::string n = "%" +
2516 asmstr.substr(a + 1, b - a - 1) +
2517 asmstr.substr(i + 2, a - i - 2);
2518 asmstr.replace(i, b - i + 1, n);
2521 asmstr.replace(i, 1, "%");
2523 else if (asmstr[i] == '%')//grr
2524 { asmstr.replace(i, 1, "%%"); ++i;}
2529 //TODO: assumptions about what consume arguments from the call are likely wrong
2530 // handle communitivity
2531 void CWriter::visitInlineAsm(CallInst &CI) {
2532 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2533 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2534 std::vector<std::pair<std::string, Value*> > Input;
2535 std::vector<std::pair<std::string, Value*> > Output;
2536 std::string Clobber;
2537 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2538 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2539 E = Constraints.end(); I != E; ++I) {
2540 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2542 InterpretASMConstraint(*I);
2545 assert(0 && "Unknown asm constraint");
2547 case InlineAsm::isInput: {
2549 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2550 ++count; //consume arg
2554 case InlineAsm::isOutput: {
2556 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2557 count ? CI.getOperand(count) : &CI));
2558 ++count; //consume arg
2562 case InlineAsm::isClobber: {
2564 Clobber += ",\"" + c + "\"";
2570 //fix up the asm string for gcc
2571 std::string asmstr = gccifyAsm(as->getAsmString());
2573 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2575 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2576 E = Output.end(); I != E; ++I) {
2577 Out << "\"" << I->first << "\"(";
2578 writeOperandRaw(I->second);
2584 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2585 E = Input.end(); I != E; ++I) {
2586 Out << "\"" << I->first << "\"(";
2587 writeOperandRaw(I->second);
2593 Out << "\n :" << Clobber.substr(1);
2597 void CWriter::visitMallocInst(MallocInst &I) {
2598 assert(0 && "lowerallocations pass didn't work!");
2601 void CWriter::visitAllocaInst(AllocaInst &I) {
2603 printType(Out, I.getType());
2604 Out << ") alloca(sizeof(";
2605 printType(Out, I.getType()->getElementType());
2607 if (I.isArrayAllocation()) {
2609 writeOperand(I.getOperand(0));
2614 void CWriter::visitFreeInst(FreeInst &I) {
2615 assert(0 && "lowerallocations pass didn't work!");
2618 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2619 gep_type_iterator E) {
2620 bool HasImplicitAddress = false;
2621 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2622 if (isa<GlobalValue>(Ptr)) {
2623 HasImplicitAddress = true;
2624 } else if (isDirectAlloca(Ptr)) {
2625 HasImplicitAddress = true;
2629 if (!HasImplicitAddress)
2630 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2632 writeOperandInternal(Ptr);
2636 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2637 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2640 writeOperandInternal(Ptr);
2642 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2644 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2647 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2648 "Can only have implicit address with direct accessing");
2650 if (HasImplicitAddress) {
2652 } else if (CI && CI->isNullValue()) {
2653 gep_type_iterator TmpI = I; ++TmpI;
2655 // Print out the -> operator if possible...
2656 if (TmpI != E && isa<StructType>(*TmpI)) {
2657 Out << (HasImplicitAddress ? "." : "->");
2658 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2664 if (isa<StructType>(*I)) {
2665 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2668 writeOperand(I.getOperand());
2673 void CWriter::visitLoadInst(LoadInst &I) {
2675 if (I.isVolatile()) {
2677 printType(Out, I.getType(), true, "volatile*");
2681 writeOperand(I.getOperand(0));
2687 void CWriter::visitStoreInst(StoreInst &I) {
2689 if (I.isVolatile()) {
2691 printType(Out, I.getOperand(0)->getType(), true, " volatile*");
2694 writeOperand(I.getPointerOperand());
2695 if (I.isVolatile()) Out << ')';
2697 writeOperand(I.getOperand(0));
2700 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2702 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2706 void CWriter::visitVAArgInst(VAArgInst &I) {
2707 Out << "va_arg(*(va_list*)";
2708 writeOperand(I.getOperand(0));
2710 printType(Out, I.getType());
2714 //===----------------------------------------------------------------------===//
2715 // External Interface declaration
2716 //===----------------------------------------------------------------------===//
2718 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2720 CodeGenFileType FileType,
2722 if (FileType != TargetMachine::AssemblyFile) return true;
2724 PM.add(createLowerGCPass());
2725 PM.add(createLowerAllocationsPass(true));
2726 PM.add(createLowerInvokePass());
2727 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2728 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2729 PM.add(new CWriter(o));