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/Intrinsics.h"
25 #include "llvm/IntrinsicInst.h"
26 #include "llvm/InlineAsm.h"
27 #include "llvm/Analysis/ConstantsScanner.h"
28 #include "llvm/Analysis/FindUsedTypes.h"
29 #include "llvm/Analysis/LoopInfo.h"
30 #include "llvm/CodeGen/IntrinsicLowering.h"
31 #include "llvm/Transforms/Scalar.h"
32 #include "llvm/Target/TargetMachineRegistry.h"
33 #include "llvm/Target/TargetAsmInfo.h"
34 #include "llvm/Support/CallSite.h"
35 #include "llvm/Support/CFG.h"
36 #include "llvm/Support/GetElementPtrTypeIterator.h"
37 #include "llvm/Support/InstVisitor.h"
38 #include "llvm/Support/Mangler.h"
39 #include "llvm/Support/MathExtras.h"
40 #include "llvm/ADT/StringExtras.h"
41 #include "llvm/ADT/STLExtras.h"
42 #include "llvm/Support/MathExtras.h"
43 #include "llvm/Config/config.h"
51 // Register the target.
52 RegisterTarget<CTargetMachine> X("c", " C backend");
54 /// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
55 /// any unnamed structure types that are used by the program, and merges
56 /// external functions with the same name.
58 class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
59 void getAnalysisUsage(AnalysisUsage &AU) const {
60 AU.addRequired<FindUsedTypes>();
63 virtual const char *getPassName() const {
64 return "C backend type canonicalizer";
67 virtual bool runOnModule(Module &M);
70 /// CWriter - This class is the main chunk of code that converts an LLVM
71 /// module to a C translation unit.
72 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
77 const Module *TheModule;
78 const TargetAsmInfo* TAsm;
79 std::map<const Type *, std::string> TypeNames;
81 std::map<const ConstantFP *, unsigned> FPConstantMap;
83 CWriter(std::ostream &o) : Out(o), TAsm(0) {}
85 virtual const char *getPassName() const { return "C backend"; }
87 void getAnalysisUsage(AnalysisUsage &AU) const {
88 AU.addRequired<LoopInfo>();
92 virtual bool doInitialization(Module &M);
94 bool runOnFunction(Function &F) {
95 LI = &getAnalysis<LoopInfo>();
97 // Get rid of intrinsics we can't handle.
100 // Output all floating point constants that cannot be printed accurately.
101 printFloatingPointConstants(F);
103 // Ensure that no local symbols conflict with global symbols.
104 F.renameLocalSymbols();
107 FPConstantMap.clear();
111 virtual bool doFinalization(Module &M) {
118 std::ostream &printType(std::ostream &Out, const Type *Ty,
119 const std::string &VariableName = "",
120 bool IgnoreName = false);
122 void printStructReturnPointerFunctionType(std::ostream &Out,
123 const PointerType *Ty);
125 void writeOperand(Value *Operand);
126 void writeOperandRaw(Value *Operand);
127 void writeOperandInternal(Value *Operand);
128 void writeOperandWithCast(Value* Operand, unsigned Opcode);
129 bool writeInstructionCast(const Instruction &I);
132 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
134 void lowerIntrinsics(Function &F);
136 void printModule(Module *M);
137 void printModuleTypes(const SymbolTable &ST);
138 void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
139 void printFloatingPointConstants(Function &F);
140 void printFunctionSignature(const Function *F, bool Prototype);
142 void printFunction(Function &);
143 void printBasicBlock(BasicBlock *BB);
144 void printLoop(Loop *L);
146 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
147 void printConstant(Constant *CPV);
148 void printConstantWithCast(Constant *CPV, unsigned Opcode);
149 bool printConstExprCast(const ConstantExpr *CE);
150 void printConstantArray(ConstantArray *CPA);
151 void printConstantPacked(ConstantPacked *CP);
153 // isInlinableInst - Attempt to inline instructions into their uses to build
154 // trees as much as possible. To do this, we have to consistently decide
155 // what is acceptable to inline, so that variable declarations don't get
156 // printed and an extra copy of the expr is not emitted.
158 static bool isInlinableInst(const Instruction &I) {
159 // Always inline setcc instructions, even if they are shared by multiple
160 // expressions. GCC generates horrible code if we don't.
161 if (isa<SetCondInst>(I)) return true;
163 // Must be an expression, must be used exactly once. If it is dead, we
164 // emit it inline where it would go.
165 if (I.getType() == Type::VoidTy || !I.hasOneUse() ||
166 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
167 isa<LoadInst>(I) || isa<VAArgInst>(I))
168 // Don't inline a load across a store or other bad things!
171 // Must not be used in inline asm
172 if (I.hasOneUse() && isInlineAsm(*I.use_back())) return false;
174 // Only inline instruction it it's use is in the same BB as the inst.
175 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
178 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
179 // variables which are accessed with the & operator. This causes GCC to
180 // generate significantly better code than to emit alloca calls directly.
182 static const AllocaInst *isDirectAlloca(const Value *V) {
183 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
184 if (!AI) return false;
185 if (AI->isArrayAllocation())
186 return 0; // FIXME: we can also inline fixed size array allocas!
187 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
192 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
193 static bool isInlineAsm(const Instruction& I) {
194 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
199 // Instruction visitation functions
200 friend class InstVisitor<CWriter>;
202 void visitReturnInst(ReturnInst &I);
203 void visitBranchInst(BranchInst &I);
204 void visitSwitchInst(SwitchInst &I);
205 void visitInvokeInst(InvokeInst &I) {
206 assert(0 && "Lowerinvoke pass didn't work!");
209 void visitUnwindInst(UnwindInst &I) {
210 assert(0 && "Lowerinvoke pass didn't work!");
212 void visitUnreachableInst(UnreachableInst &I);
214 void visitPHINode(PHINode &I);
215 void visitBinaryOperator(Instruction &I);
217 void visitCastInst (CastInst &I);
218 void visitSelectInst(SelectInst &I);
219 void visitCallInst (CallInst &I);
220 void visitInlineAsm(CallInst &I);
221 void visitShiftInst(ShiftInst &I) { visitBinaryOperator(I); }
223 void visitMallocInst(MallocInst &I);
224 void visitAllocaInst(AllocaInst &I);
225 void visitFreeInst (FreeInst &I);
226 void visitLoadInst (LoadInst &I);
227 void visitStoreInst (StoreInst &I);
228 void visitGetElementPtrInst(GetElementPtrInst &I);
229 void visitVAArgInst (VAArgInst &I);
231 void visitInstruction(Instruction &I) {
232 std::cerr << "C Writer does not know about " << I;
236 void outputLValue(Instruction *I) {
237 Out << " " << Mang->getValueName(I) << " = ";
240 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
241 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
242 BasicBlock *Successor, unsigned Indent);
243 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
245 void printIndexingExpression(Value *Ptr, gep_type_iterator I,
246 gep_type_iterator E);
250 /// This method inserts names for any unnamed structure types that are used by
251 /// the program, and removes names from structure types that are not used by the
254 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
255 // Get a set of types that are used by the program...
256 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
258 // Loop over the module symbol table, removing types from UT that are
259 // already named, and removing names for types that are not used.
261 SymbolTable &MST = M.getSymbolTable();
262 for (SymbolTable::type_iterator TI = MST.type_begin(), TE = MST.type_end();
264 SymbolTable::type_iterator I = TI++;
266 // If this is not used, remove it from the symbol table.
267 std::set<const Type *>::iterator UTI = UT.find(I->second);
271 UT.erase(UTI); // Only keep one name for this type.
274 // UT now contains types that are not named. Loop over it, naming
277 bool Changed = false;
278 unsigned RenameCounter = 0;
279 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
281 if (const StructType *ST = dyn_cast<StructType>(*I)) {
282 while (M.addTypeName("unnamed"+utostr(RenameCounter), ST))
288 // Loop over all external functions and globals. If we have two with
289 // identical names, merge them.
290 // FIXME: This code should disappear when we don't allow values with the same
291 // names when they have different types!
292 std::map<std::string, GlobalValue*> ExtSymbols;
293 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
295 if (GV->isExternal() && GV->hasName()) {
296 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
297 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
299 // Found a conflict, replace this global with the previous one.
300 GlobalValue *OldGV = X.first->second;
301 GV->replaceAllUsesWith(ConstantExpr::getCast(OldGV, GV->getType()));
302 GV->eraseFromParent();
307 // Do the same for globals.
308 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
310 GlobalVariable *GV = I++;
311 if (GV->isExternal() && GV->hasName()) {
312 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
313 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
315 // Found a conflict, replace this global with the previous one.
316 GlobalValue *OldGV = X.first->second;
317 GV->replaceAllUsesWith(ConstantExpr::getCast(OldGV, GV->getType()));
318 GV->eraseFromParent();
327 /// printStructReturnPointerFunctionType - This is like printType for a struct
328 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
329 /// print it as "Struct (*)(...)", for struct return functions.
330 void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
331 const PointerType *TheTy) {
332 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
333 std::stringstream FunctionInnards;
334 FunctionInnards << " (*) (";
335 bool PrintedType = false;
337 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
338 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
339 for (++I; I != E; ++I) {
341 FunctionInnards << ", ";
342 printType(FunctionInnards, *I, "");
345 if (FTy->isVarArg()) {
347 FunctionInnards << ", ...";
348 } else if (!PrintedType) {
349 FunctionInnards << "void";
351 FunctionInnards << ')';
352 std::string tstr = FunctionInnards.str();
353 printType(Out, RetTy, tstr);
357 // Pass the Type* and the variable name and this prints out the variable
360 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
361 const std::string &NameSoFar,
363 if (Ty->isPrimitiveType())
364 switch (Ty->getTypeID()) {
365 case Type::VoidTyID: return Out << "void " << NameSoFar;
366 case Type::BoolTyID: return Out << "bool " << NameSoFar;
367 case Type::UByteTyID: return Out << "unsigned char " << NameSoFar;
368 case Type::SByteTyID: return Out << "signed char " << NameSoFar;
369 case Type::UShortTyID: return Out << "unsigned short " << NameSoFar;
370 case Type::ShortTyID: return Out << "short " << NameSoFar;
371 case Type::UIntTyID: return Out << "unsigned " << NameSoFar;
372 case Type::IntTyID: return Out << "int " << NameSoFar;
373 case Type::ULongTyID: return Out << "unsigned long long " << NameSoFar;
374 case Type::LongTyID: return Out << "signed long long " << NameSoFar;
375 case Type::FloatTyID: return Out << "float " << NameSoFar;
376 case Type::DoubleTyID: return Out << "double " << NameSoFar;
378 std::cerr << "Unknown primitive type: " << *Ty << "\n";
382 // Check to see if the type is named.
383 if (!IgnoreName || isa<OpaqueType>(Ty)) {
384 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
385 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
388 switch (Ty->getTypeID()) {
389 case Type::FunctionTyID: {
390 const FunctionType *FTy = cast<FunctionType>(Ty);
391 std::stringstream FunctionInnards;
392 FunctionInnards << " (" << NameSoFar << ") (";
393 for (FunctionType::param_iterator I = FTy->param_begin(),
394 E = FTy->param_end(); I != E; ++I) {
395 if (I != FTy->param_begin())
396 FunctionInnards << ", ";
397 printType(FunctionInnards, *I, "");
399 if (FTy->isVarArg()) {
400 if (FTy->getNumParams())
401 FunctionInnards << ", ...";
402 } else if (!FTy->getNumParams()) {
403 FunctionInnards << "void";
405 FunctionInnards << ')';
406 std::string tstr = FunctionInnards.str();
407 printType(Out, FTy->getReturnType(), tstr);
410 case Type::StructTyID: {
411 const StructType *STy = cast<StructType>(Ty);
412 Out << NameSoFar + " {\n";
414 for (StructType::element_iterator I = STy->element_begin(),
415 E = STy->element_end(); I != E; ++I) {
417 printType(Out, *I, "field" + utostr(Idx++));
423 case Type::PointerTyID: {
424 const PointerType *PTy = cast<PointerType>(Ty);
425 std::string ptrName = "*" + NameSoFar;
427 if (isa<ArrayType>(PTy->getElementType()) ||
428 isa<PackedType>(PTy->getElementType()))
429 ptrName = "(" + ptrName + ")";
431 return printType(Out, PTy->getElementType(), ptrName);
434 case Type::ArrayTyID: {
435 const ArrayType *ATy = cast<ArrayType>(Ty);
436 unsigned NumElements = ATy->getNumElements();
437 if (NumElements == 0) NumElements = 1;
438 return printType(Out, ATy->getElementType(),
439 NameSoFar + "[" + utostr(NumElements) + "]");
442 case Type::PackedTyID: {
443 const PackedType *PTy = cast<PackedType>(Ty);
444 unsigned NumElements = PTy->getNumElements();
445 if (NumElements == 0) NumElements = 1;
446 return printType(Out, PTy->getElementType(),
447 NameSoFar + "[" + utostr(NumElements) + "]");
450 case Type::OpaqueTyID: {
451 static int Count = 0;
452 std::string TyName = "struct opaque_" + itostr(Count++);
453 assert(TypeNames.find(Ty) == TypeNames.end());
454 TypeNames[Ty] = TyName;
455 return Out << TyName << ' ' << NameSoFar;
458 assert(0 && "Unhandled case in getTypeProps!");
465 void CWriter::printConstantArray(ConstantArray *CPA) {
467 // As a special case, print the array as a string if it is an array of
468 // ubytes or an array of sbytes with positive values.
470 const Type *ETy = CPA->getType()->getElementType();
471 bool isString = (ETy == Type::SByteTy || ETy == Type::UByteTy);
473 // Make sure the last character is a null char, as automatically added by C
474 if (isString && (CPA->getNumOperands() == 0 ||
475 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
480 // Keep track of whether the last number was a hexadecimal escape
481 bool LastWasHex = false;
483 // Do not include the last character, which we know is null
484 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
485 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
487 // Print it out literally if it is a printable character. The only thing
488 // to be careful about is when the last letter output was a hex escape
489 // code, in which case we have to be careful not to print out hex digits
490 // explicitly (the C compiler thinks it is a continuation of the previous
491 // character, sheesh...)
493 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
495 if (C == '"' || C == '\\')
502 case '\n': Out << "\\n"; break;
503 case '\t': Out << "\\t"; break;
504 case '\r': Out << "\\r"; break;
505 case '\v': Out << "\\v"; break;
506 case '\a': Out << "\\a"; break;
507 case '\"': Out << "\\\""; break;
508 case '\'': Out << "\\\'"; break;
511 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
512 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
521 if (CPA->getNumOperands()) {
523 printConstant(cast<Constant>(CPA->getOperand(0)));
524 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
526 printConstant(cast<Constant>(CPA->getOperand(i)));
533 void CWriter::printConstantPacked(ConstantPacked *CP) {
535 if (CP->getNumOperands()) {
537 printConstant(cast<Constant>(CP->getOperand(0)));
538 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
540 printConstant(cast<Constant>(CP->getOperand(i)));
546 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
547 // textually as a double (rather than as a reference to a stack-allocated
548 // variable). We decide this by converting CFP to a string and back into a
549 // double, and then checking whether the conversion results in a bit-equal
550 // double to the original value of CFP. This depends on us and the target C
551 // compiler agreeing on the conversion process (which is pretty likely since we
552 // only deal in IEEE FP).
554 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
555 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
557 sprintf(Buffer, "%a", CFP->getValue());
559 if (!strncmp(Buffer, "0x", 2) ||
560 !strncmp(Buffer, "-0x", 3) ||
561 !strncmp(Buffer, "+0x", 3))
562 return atof(Buffer) == CFP->getValue();
565 std::string StrVal = ftostr(CFP->getValue());
567 while (StrVal[0] == ' ')
568 StrVal.erase(StrVal.begin());
570 // Check to make sure that the stringized number is not some string like "Inf"
571 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
572 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
573 ((StrVal[0] == '-' || StrVal[0] == '+') &&
574 (StrVal[1] >= '0' && StrVal[1] <= '9')))
575 // Reparse stringized version!
576 return atof(StrVal.c_str()) == CFP->getValue();
581 /// Print out the casting for a cast operation. This does the double casting
582 /// necessary for conversion to the destination type, if necessary.
583 /// @returns true if a closing paren is necessary
584 /// @brief Print a cast
585 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
587 printType(Out, DstTy);
590 case Instruction::UIToFP:
591 case Instruction::ZExt:
592 if (SrcTy->isSigned()) {
594 printType(Out, SrcTy->getUnsignedVersion());
598 case Instruction::SIToFP:
599 case Instruction::SExt:
600 if (SrcTy->isUnsigned()) {
602 printType(Out, SrcTy->getSignedVersion());
606 case Instruction::IntToPtr:
607 case Instruction::PtrToInt:
608 // Avoid "cast to pointer from integer of different size" warnings
609 Out << "(unsigned long)";
611 case Instruction::Trunc:
612 case Instruction::BitCast:
613 case Instruction::FPExt:
614 case Instruction::FPTrunc:
615 case Instruction::FPToSI:
616 case Instruction::FPToUI:
622 // printConstant - The LLVM Constant to C Constant converter.
623 void CWriter::printConstant(Constant *CPV) {
624 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
625 switch (CE->getOpcode()) {
626 case Instruction::Trunc:
627 case Instruction::ZExt:
628 case Instruction::SExt:
629 case Instruction::FPTrunc:
630 case Instruction::FPExt:
631 case Instruction::UIToFP:
632 case Instruction::SIToFP:
633 case Instruction::FPToUI:
634 case Instruction::FPToSI:
635 case Instruction::PtrToInt:
636 case Instruction::IntToPtr:
637 case Instruction::BitCast:
639 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
640 if (CE->getOpcode() == Instruction::SExt &&
641 CE->getOperand(0)->getType() == Type::BoolTy) {
642 // Make sure we really sext from bool here by subtracting from 0
645 printConstant(CE->getOperand(0));
646 if (CE->getType() == Type::BoolTy &&
647 (CE->getOpcode() == Instruction::Trunc ||
648 CE->getOpcode() == Instruction::FPToUI ||
649 CE->getOpcode() == Instruction::FPToSI ||
650 CE->getOpcode() == Instruction::PtrToInt)) {
651 // Make sure we really truncate to bool here by anding with 1
657 case Instruction::GetElementPtr:
659 printIndexingExpression(CE->getOperand(0), gep_type_begin(CPV),
663 case Instruction::Select:
665 printConstant(CE->getOperand(0));
667 printConstant(CE->getOperand(1));
669 printConstant(CE->getOperand(2));
672 case Instruction::Add:
673 case Instruction::Sub:
674 case Instruction::Mul:
675 case Instruction::SDiv:
676 case Instruction::UDiv:
677 case Instruction::FDiv:
678 case Instruction::URem:
679 case Instruction::SRem:
680 case Instruction::FRem:
681 case Instruction::And:
682 case Instruction::Or:
683 case Instruction::Xor:
684 case Instruction::SetEQ:
685 case Instruction::SetNE:
686 case Instruction::SetLT:
687 case Instruction::SetLE:
688 case Instruction::SetGT:
689 case Instruction::SetGE:
690 case Instruction::Shl:
691 case Instruction::LShr:
692 case Instruction::AShr:
695 bool NeedsClosingParens = printConstExprCast(CE);
696 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
697 switch (CE->getOpcode()) {
698 case Instruction::Add: Out << " + "; break;
699 case Instruction::Sub: Out << " - "; break;
700 case Instruction::Mul: Out << " * "; break;
701 case Instruction::URem:
702 case Instruction::SRem:
703 case Instruction::FRem: Out << " % "; break;
704 case Instruction::UDiv:
705 case Instruction::SDiv:
706 case Instruction::FDiv: Out << " / "; break;
707 case Instruction::And: Out << " & "; break;
708 case Instruction::Or: Out << " | "; break;
709 case Instruction::Xor: Out << " ^ "; break;
710 case Instruction::SetEQ: Out << " == "; break;
711 case Instruction::SetNE: Out << " != "; break;
712 case Instruction::SetLT: Out << " < "; break;
713 case Instruction::SetLE: Out << " <= "; break;
714 case Instruction::SetGT: Out << " > "; break;
715 case Instruction::SetGE: Out << " >= "; break;
716 case Instruction::Shl: Out << " << "; break;
717 case Instruction::LShr:
718 case Instruction::AShr: Out << " >> "; break;
719 default: assert(0 && "Illegal opcode here!");
721 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
722 if (NeedsClosingParens)
729 std::cerr << "CWriter Error: Unhandled constant expression: "
733 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
735 printType(Out, CPV->getType());
736 Out << ")/*UNDEF*/0)";
740 switch (CPV->getType()->getTypeID()) {
742 Out << (cast<ConstantBool>(CPV)->getValue() ? '1' : '0');
744 case Type::SByteTyID:
745 case Type::ShortTyID:
746 Out << cast<ConstantInt>(CPV)->getSExtValue();
749 if ((int)cast<ConstantInt>(CPV)->getSExtValue() == (int)0x80000000)
750 Out << "((int)0x80000000U)"; // Handle MININT specially to avoid warning
752 Out << cast<ConstantInt>(CPV)->getSExtValue();
756 if (cast<ConstantInt>(CPV)->isMinValue())
757 Out << "(/*INT64_MIN*/(-9223372036854775807LL)-1)";
759 Out << cast<ConstantInt>(CPV)->getSExtValue() << "ll";
762 case Type::UByteTyID:
763 case Type::UShortTyID:
764 Out << cast<ConstantInt>(CPV)->getZExtValue();
767 Out << cast<ConstantInt>(CPV)->getZExtValue() << 'u';
769 case Type::ULongTyID:
770 Out << cast<ConstantInt>(CPV)->getZExtValue() << "ull";
773 case Type::FloatTyID:
774 case Type::DoubleTyID: {
775 ConstantFP *FPC = cast<ConstantFP>(CPV);
776 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
777 if (I != FPConstantMap.end()) {
778 // Because of FP precision problems we must load from a stack allocated
779 // value that holds the value in hex.
780 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
781 << "*)&FPConstant" << I->second << ')';
783 if (IsNAN(FPC->getValue())) {
786 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
788 const unsigned long QuietNaN = 0x7ff8UL;
789 //const unsigned long SignalNaN = 0x7ff4UL;
791 // We need to grab the first part of the FP #
794 uint64_t ll = DoubleToBits(FPC->getValue());
795 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
797 std::string Num(&Buffer[0], &Buffer[6]);
798 unsigned long Val = strtoul(Num.c_str(), 0, 16);
800 if (FPC->getType() == Type::FloatTy)
801 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
802 << Buffer << "\") /*nan*/ ";
804 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
805 << Buffer << "\") /*nan*/ ";
806 } else if (IsInf(FPC->getValue())) {
808 if (FPC->getValue() < 0) Out << '-';
809 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
813 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
814 // Print out the constant as a floating point number.
816 sprintf(Buffer, "%a", FPC->getValue());
819 Num = ftostr(FPC->getValue());
827 case Type::ArrayTyID:
828 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
829 const ArrayType *AT = cast<ArrayType>(CPV->getType());
831 if (AT->getNumElements()) {
833 Constant *CZ = Constant::getNullValue(AT->getElementType());
835 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
842 printConstantArray(cast<ConstantArray>(CPV));
846 case Type::PackedTyID:
847 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
848 const PackedType *AT = cast<PackedType>(CPV->getType());
850 if (AT->getNumElements()) {
852 Constant *CZ = Constant::getNullValue(AT->getElementType());
854 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
861 printConstantPacked(cast<ConstantPacked>(CPV));
865 case Type::StructTyID:
866 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
867 const StructType *ST = cast<StructType>(CPV->getType());
869 if (ST->getNumElements()) {
871 printConstant(Constant::getNullValue(ST->getElementType(0)));
872 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
874 printConstant(Constant::getNullValue(ST->getElementType(i)));
880 if (CPV->getNumOperands()) {
882 printConstant(cast<Constant>(CPV->getOperand(0)));
883 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
885 printConstant(cast<Constant>(CPV->getOperand(i)));
892 case Type::PointerTyID:
893 if (isa<ConstantPointerNull>(CPV)) {
895 printType(Out, CPV->getType());
896 Out << ")/*NULL*/0)";
898 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
904 std::cerr << "Unknown constant type: " << *CPV << "\n";
909 // Some constant expressions need to be casted back to the original types
910 // because their operands were casted to the expected type. This function takes
911 // care of detecting that case and printing the cast for the ConstantExpr.
912 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
913 bool NeedsExplicitCast = false;
914 const Type *Ty = CE->getOperand(0)->getType();
915 switch (CE->getOpcode()) {
916 case Instruction::LShr:
917 case Instruction::URem:
918 case Instruction::UDiv:
919 NeedsExplicitCast = Ty->isSigned(); break;
920 case Instruction::AShr:
921 case Instruction::SRem:
922 case Instruction::SDiv:
923 NeedsExplicitCast = Ty->isUnsigned(); break;
924 case Instruction::ZExt:
925 case Instruction::SExt:
926 case Instruction::Trunc:
927 case Instruction::FPTrunc:
928 case Instruction::FPExt:
929 case Instruction::UIToFP:
930 case Instruction::SIToFP:
931 case Instruction::FPToUI:
932 case Instruction::FPToSI:
933 case Instruction::PtrToInt:
934 case Instruction::IntToPtr:
935 case Instruction::BitCast:
937 NeedsExplicitCast = true;
941 if (NeedsExplicitCast) {
946 return NeedsExplicitCast;
949 // Print a constant assuming that it is the operand for a given Opcode. The
950 // opcodes that care about sign need to cast their operands to the expected
951 // type before the operation proceeds. This function does the casting.
952 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
954 // Extract the operand's type, we'll need it.
955 const Type* OpTy = CPV->getType();
957 // Indicate whether to do the cast or not.
958 bool shouldCast = false;
960 // Based on the Opcode for which this Constant is being written, determine
961 // the new type to which the operand should be casted by setting the value
962 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
966 // for most instructions, it doesn't matter
968 case Instruction::LShr:
969 case Instruction::UDiv:
970 case Instruction::URem:
971 // For UDiv/URem get correct type
972 if (OpTy->isSigned()) {
973 OpTy = OpTy->getUnsignedVersion();
977 case Instruction::AShr:
978 case Instruction::SDiv:
979 case Instruction::SRem:
980 // For SDiv/SRem get correct type
981 if (OpTy->isUnsigned()) {
982 OpTy = OpTy->getSignedVersion();
988 // Write out the casted constant if we should, otherwise just write the
992 printType(Out, OpTy);
1001 void CWriter::writeOperandInternal(Value *Operand) {
1002 if (Instruction *I = dyn_cast<Instruction>(Operand))
1003 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1004 // Should we inline this instruction to build a tree?
1011 Constant* CPV = dyn_cast<Constant>(Operand);
1012 if (CPV && !isa<GlobalValue>(CPV)) {
1015 Out << Mang->getValueName(Operand);
1019 void CWriter::writeOperandRaw(Value *Operand) {
1020 Constant* CPV = dyn_cast<Constant>(Operand);
1021 if (CPV && !isa<GlobalValue>(CPV)) {
1024 Out << Mang->getValueName(Operand);
1028 void CWriter::writeOperand(Value *Operand) {
1029 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1030 Out << "(&"; // Global variables are referenced as their addresses by llvm
1032 writeOperandInternal(Operand);
1034 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1038 // Some instructions need to have their result value casted back to the
1039 // original types because their operands were casted to the expected type.
1040 // This function takes care of detecting that case and printing the cast
1041 // for the Instruction.
1042 bool CWriter::writeInstructionCast(const Instruction &I) {
1043 bool NeedsExplicitCast = false;
1044 const Type *Ty = I.getOperand(0)->getType();
1045 switch (I.getOpcode()) {
1046 case Instruction::LShr:
1047 case Instruction::URem:
1048 case Instruction::UDiv:
1049 NeedsExplicitCast = Ty->isSigned(); break;
1050 case Instruction::AShr:
1051 case Instruction::SRem:
1052 case Instruction::SDiv:
1053 NeedsExplicitCast = Ty->isUnsigned(); break;
1054 case Instruction::ZExt:
1055 case Instruction::SExt:
1056 case Instruction::Trunc:
1057 case Instruction::FPTrunc:
1058 case Instruction::FPExt:
1059 case Instruction::UIToFP:
1060 case Instruction::SIToFP:
1061 case Instruction::FPToUI:
1062 case Instruction::FPToSI:
1063 case Instruction::PtrToInt:
1064 case Instruction::IntToPtr:
1065 case Instruction::BitCast:
1067 NeedsExplicitCast = true;
1071 if (NeedsExplicitCast) {
1076 return NeedsExplicitCast;
1079 // Write the operand with a cast to another type based on the Opcode being used.
1080 // This will be used in cases where an instruction has specific type
1081 // requirements (usually signedness) for its operands.
1082 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1084 // Extract the operand's type, we'll need it.
1085 const Type* OpTy = Operand->getType();
1087 // Indicate whether to do the cast or not.
1088 bool shouldCast = false;
1090 // Based on the Opcode for which this Operand is being written, determine
1091 // the new type to which the operand should be casted by setting the value
1092 // of OpTy. If we change OpTy, also set shouldCast to true.
1095 // for most instructions, it doesn't matter
1097 case Instruction::LShr:
1098 case Instruction::UDiv:
1099 case Instruction::URem:
1100 // For UDiv to have unsigned operands
1101 if (OpTy->isSigned()) {
1102 OpTy = OpTy->getUnsignedVersion();
1106 case Instruction::AShr:
1107 case Instruction::SDiv:
1108 case Instruction::SRem:
1109 if (OpTy->isUnsigned()) {
1110 OpTy = OpTy->getSignedVersion();
1116 // Write out the casted operand if we should, otherwise just write the
1120 printType(Out, OpTy);
1122 writeOperand(Operand);
1125 writeOperand(Operand);
1129 // generateCompilerSpecificCode - This is where we add conditional compilation
1130 // directives to cater to specific compilers as need be.
1132 static void generateCompilerSpecificCode(std::ostream& Out) {
1133 // Alloca is hard to get, and we don't want to include stdlib.h here.
1134 Out << "/* get a declaration for alloca */\n"
1135 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1136 << "extern void *_alloca(unsigned long);\n"
1137 << "#define alloca(x) _alloca(x)\n"
1138 << "#elif defined(__APPLE__)\n"
1139 << "extern void *__builtin_alloca(unsigned long);\n"
1140 << "#define alloca(x) __builtin_alloca(x)\n"
1141 << "#elif defined(__sun__)\n"
1142 << "#if defined(__sparcv9)\n"
1143 << "extern void *__builtin_alloca(unsigned long);\n"
1145 << "extern void *__builtin_alloca(unsigned int);\n"
1147 << "#define alloca(x) __builtin_alloca(x)\n"
1148 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1149 << "#define alloca(x) __builtin_alloca(x)\n"
1150 << "#elif !defined(_MSC_VER)\n"
1151 << "#include <alloca.h>\n"
1154 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1155 // If we aren't being compiled with GCC, just drop these attributes.
1156 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1157 << "#define __attribute__(X)\n"
1161 // At some point, we should support "external weak" vs. "weak" linkages.
1162 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1163 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1164 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1165 << "#elif defined(__GNUC__)\n"
1166 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1168 << "#define __EXTERNAL_WEAK__\n"
1172 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1173 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1174 << "#define __ATTRIBUTE_WEAK__\n"
1175 << "#elif defined(__GNUC__)\n"
1176 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1178 << "#define __ATTRIBUTE_WEAK__\n"
1181 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1182 // From the GCC documentation:
1184 // double __builtin_nan (const char *str)
1186 // This is an implementation of the ISO C99 function nan.
1188 // Since ISO C99 defines this function in terms of strtod, which we do
1189 // not implement, a description of the parsing is in order. The string is
1190 // parsed as by strtol; that is, the base is recognized by leading 0 or
1191 // 0x prefixes. The number parsed is placed in the significand such that
1192 // the least significant bit of the number is at the least significant
1193 // bit of the significand. The number is truncated to fit the significand
1194 // field provided. The significand is forced to be a quiet NaN.
1196 // This function, if given a string literal, is evaluated early enough
1197 // that it is considered a compile-time constant.
1199 // float __builtin_nanf (const char *str)
1201 // Similar to __builtin_nan, except the return type is float.
1203 // double __builtin_inf (void)
1205 // Similar to __builtin_huge_val, except a warning is generated if the
1206 // target floating-point format does not support infinities. This
1207 // function is suitable for implementing the ISO C99 macro INFINITY.
1209 // float __builtin_inff (void)
1211 // Similar to __builtin_inf, except the return type is float.
1212 Out << "#ifdef __GNUC__\n"
1213 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1214 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1215 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1216 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1217 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1218 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1219 << "#define LLVM_PREFETCH(addr,rw,locality) "
1220 "__builtin_prefetch(addr,rw,locality)\n"
1221 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1222 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1223 << "#define LLVM_ASM __asm__\n"
1225 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1226 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1227 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1228 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1229 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1230 << "#define LLVM_INFF 0.0F /* Float */\n"
1231 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1232 << "#define __ATTRIBUTE_CTOR__\n"
1233 << "#define __ATTRIBUTE_DTOR__\n"
1234 << "#define LLVM_ASM(X)\n"
1237 // Output target-specific code that should be inserted into main.
1238 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1239 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1240 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1241 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1242 << "defined(__x86_64__)\n"
1243 << "#undef CODE_FOR_MAIN\n"
1244 << "#define CODE_FOR_MAIN() \\\n"
1245 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1246 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1247 << "#endif\n#endif\n";
1251 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1252 /// the StaticTors set.
1253 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1254 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1255 if (!InitList) return;
1257 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1258 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1259 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1261 if (CS->getOperand(1)->isNullValue())
1262 return; // Found a null terminator, exit printing.
1263 Constant *FP = CS->getOperand(1);
1264 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1266 FP = CE->getOperand(0);
1267 if (Function *F = dyn_cast<Function>(FP))
1268 StaticTors.insert(F);
1272 enum SpecialGlobalClass {
1274 GlobalCtors, GlobalDtors,
1278 /// getGlobalVariableClass - If this is a global that is specially recognized
1279 /// by LLVM, return a code that indicates how we should handle it.
1280 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1281 // If this is a global ctors/dtors list, handle it now.
1282 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1283 if (GV->getName() == "llvm.global_ctors")
1285 else if (GV->getName() == "llvm.global_dtors")
1289 // Otherwise, it it is other metadata, don't print it. This catches things
1290 // like debug information.
1291 if (GV->getSection() == "llvm.metadata")
1298 bool CWriter::doInitialization(Module &M) {
1302 IL.AddPrototypes(M);
1304 // Ensure that all structure types have names...
1305 Mang = new Mangler(M);
1306 Mang->markCharUnacceptable('.');
1308 // Keep track of which functions are static ctors/dtors so they can have
1309 // an attribute added to their prototypes.
1310 std::set<Function*> StaticCtors, StaticDtors;
1311 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1313 switch (getGlobalVariableClass(I)) {
1316 FindStaticTors(I, StaticCtors);
1319 FindStaticTors(I, StaticDtors);
1324 // get declaration for alloca
1325 Out << "/* Provide Declarations */\n";
1326 Out << "#include <stdarg.h>\n"; // Varargs support
1327 Out << "#include <setjmp.h>\n"; // Unwind support
1328 generateCompilerSpecificCode(Out);
1330 // Provide a definition for `bool' if not compiling with a C++ compiler.
1332 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1334 << "\n\n/* Support for floating point constants */\n"
1335 << "typedef unsigned long long ConstantDoubleTy;\n"
1336 << "typedef unsigned int ConstantFloatTy;\n"
1338 << "\n\n/* Global Declarations */\n";
1340 // First output all the declarations for the program, because C requires
1341 // Functions & globals to be declared before they are used.
1344 // Loop over the symbol table, emitting all named constants...
1345 printModuleTypes(M.getSymbolTable());
1347 // Global variable declarations...
1348 if (!M.global_empty()) {
1349 Out << "\n/* External Global Variable Declarations */\n";
1350 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1352 if (I->hasExternalLinkage()) {
1354 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1356 } else if (I->hasDLLImportLinkage()) {
1357 Out << "__declspec(dllimport) ";
1358 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1364 // Function declarations
1365 Out << "\n/* Function Declarations */\n";
1366 Out << "double fmod(double, double);\n"; // Support for FP rem
1367 Out << "float fmodf(float, float);\n";
1369 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1370 // Don't print declarations for intrinsic functions.
1371 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1372 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1373 printFunctionSignature(I, true);
1374 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1375 Out << " __ATTRIBUTE_WEAK__";
1376 if (StaticCtors.count(I))
1377 Out << " __ATTRIBUTE_CTOR__";
1378 if (StaticDtors.count(I))
1379 Out << " __ATTRIBUTE_DTOR__";
1381 if (I->hasName() && I->getName()[0] == 1)
1382 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1388 // Output the global variable declarations
1389 if (!M.global_empty()) {
1390 Out << "\n\n/* Global Variable Declarations */\n";
1391 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1393 if (!I->isExternal()) {
1394 // Ignore special globals, such as debug info.
1395 if (getGlobalVariableClass(I))
1398 if (I->hasInternalLinkage())
1402 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1404 if (I->hasLinkOnceLinkage())
1405 Out << " __attribute__((common))";
1406 else if (I->hasWeakLinkage())
1407 Out << " __ATTRIBUTE_WEAK__";
1412 // Output the global variable definitions and contents...
1413 if (!M.global_empty()) {
1414 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1415 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1417 if (!I->isExternal()) {
1418 // Ignore special globals, such as debug info.
1419 if (getGlobalVariableClass(I))
1422 if (I->hasInternalLinkage())
1424 else if (I->hasDLLImportLinkage())
1425 Out << "__declspec(dllimport) ";
1426 else if (I->hasDLLExportLinkage())
1427 Out << "__declspec(dllexport) ";
1429 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1430 if (I->hasLinkOnceLinkage())
1431 Out << " __attribute__((common))";
1432 else if (I->hasWeakLinkage())
1433 Out << " __ATTRIBUTE_WEAK__";
1435 // If the initializer is not null, emit the initializer. If it is null,
1436 // we try to avoid emitting large amounts of zeros. The problem with
1437 // this, however, occurs when the variable has weak linkage. In this
1438 // case, the assembler will complain about the variable being both weak
1439 // and common, so we disable this optimization.
1440 if (!I->getInitializer()->isNullValue()) {
1442 writeOperand(I->getInitializer());
1443 } else if (I->hasWeakLinkage()) {
1444 // We have to specify an initializer, but it doesn't have to be
1445 // complete. If the value is an aggregate, print out { 0 }, and let
1446 // the compiler figure out the rest of the zeros.
1448 if (isa<StructType>(I->getInitializer()->getType()) ||
1449 isa<ArrayType>(I->getInitializer()->getType()) ||
1450 isa<PackedType>(I->getInitializer()->getType())) {
1453 // Just print it out normally.
1454 writeOperand(I->getInitializer());
1462 Out << "\n\n/* Function Bodies */\n";
1467 /// Output all floating point constants that cannot be printed accurately...
1468 void CWriter::printFloatingPointConstants(Function &F) {
1469 // Scan the module for floating point constants. If any FP constant is used
1470 // in the function, we want to redirect it here so that we do not depend on
1471 // the precision of the printed form, unless the printed form preserves
1474 static unsigned FPCounter = 0;
1475 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1477 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1478 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1479 !FPConstantMap.count(FPC)) {
1480 double Val = FPC->getValue();
1482 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1484 if (FPC->getType() == Type::DoubleTy) {
1485 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1486 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1487 << "ULL; /* " << Val << " */\n";
1488 } else if (FPC->getType() == Type::FloatTy) {
1489 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1490 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1491 << "U; /* " << Val << " */\n";
1493 assert(0 && "Unknown float type!");
1500 /// printSymbolTable - Run through symbol table looking for type names. If a
1501 /// type name is found, emit its declaration...
1503 void CWriter::printModuleTypes(const SymbolTable &ST) {
1504 // We are only interested in the type plane of the symbol table.
1505 SymbolTable::type_const_iterator I = ST.type_begin();
1506 SymbolTable::type_const_iterator End = ST.type_end();
1508 // If there are no type names, exit early.
1509 if (I == End) return;
1511 // Print out forward declarations for structure types before anything else!
1512 Out << "/* Structure forward decls */\n";
1513 for (; I != End; ++I)
1514 if (const Type *STy = dyn_cast<StructType>(I->second)) {
1515 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1516 Out << Name << ";\n";
1517 TypeNames.insert(std::make_pair(STy, Name));
1522 // Now we can print out typedefs...
1523 Out << "/* Typedefs */\n";
1524 for (I = ST.type_begin(); I != End; ++I) {
1525 const Type *Ty = cast<Type>(I->second);
1526 std::string Name = "l_" + Mang->makeNameProper(I->first);
1528 printType(Out, Ty, Name);
1534 // Keep track of which structures have been printed so far...
1535 std::set<const StructType *> StructPrinted;
1537 // Loop over all structures then push them into the stack so they are
1538 // printed in the correct order.
1540 Out << "/* Structure contents */\n";
1541 for (I = ST.type_begin(); I != End; ++I)
1542 if (const StructType *STy = dyn_cast<StructType>(I->second))
1543 // Only print out used types!
1544 printContainedStructs(STy, StructPrinted);
1547 // Push the struct onto the stack and recursively push all structs
1548 // this one depends on.
1550 // TODO: Make this work properly with packed types
1552 void CWriter::printContainedStructs(const Type *Ty,
1553 std::set<const StructType*> &StructPrinted){
1554 // Don't walk through pointers.
1555 if (isa<PointerType>(Ty) || Ty->isPrimitiveType()) return;
1557 // Print all contained types first.
1558 for (Type::subtype_iterator I = Ty->subtype_begin(),
1559 E = Ty->subtype_end(); I != E; ++I)
1560 printContainedStructs(*I, StructPrinted);
1562 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1563 // Check to see if we have already printed this struct.
1564 if (StructPrinted.insert(STy).second) {
1565 // Print structure type out.
1566 std::string Name = TypeNames[STy];
1567 printType(Out, STy, Name, true);
1573 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1574 /// isCStructReturn - Should this function actually return a struct by-value?
1575 bool isCStructReturn = F->getCallingConv() == CallingConv::CSRet;
1577 if (F->hasInternalLinkage()) Out << "static ";
1578 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1579 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1580 switch (F->getCallingConv()) {
1581 case CallingConv::X86_StdCall:
1582 Out << "__stdcall ";
1584 case CallingConv::X86_FastCall:
1585 Out << "__fastcall ";
1589 // Loop over the arguments, printing them...
1590 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1592 std::stringstream FunctionInnards;
1594 // Print out the name...
1595 FunctionInnards << Mang->getValueName(F) << '(';
1597 bool PrintedArg = false;
1598 if (!F->isExternal()) {
1599 if (!F->arg_empty()) {
1600 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1602 // If this is a struct-return function, don't print the hidden
1603 // struct-return argument.
1604 if (isCStructReturn) {
1605 assert(I != E && "Invalid struct return function!");
1609 std::string ArgName;
1610 for (; I != E; ++I) {
1611 if (PrintedArg) FunctionInnards << ", ";
1612 if (I->hasName() || !Prototype)
1613 ArgName = Mang->getValueName(I);
1616 printType(FunctionInnards, I->getType(), ArgName);
1621 // Loop over the arguments, printing them.
1622 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1624 // If this is a struct-return function, don't print the hidden
1625 // struct-return argument.
1626 if (isCStructReturn) {
1627 assert(I != E && "Invalid struct return function!");
1631 for (; I != E; ++I) {
1632 if (PrintedArg) FunctionInnards << ", ";
1633 printType(FunctionInnards, *I);
1638 // Finish printing arguments... if this is a vararg function, print the ...,
1639 // unless there are no known types, in which case, we just emit ().
1641 if (FT->isVarArg() && PrintedArg) {
1642 if (PrintedArg) FunctionInnards << ", ";
1643 FunctionInnards << "..."; // Output varargs portion of signature!
1644 } else if (!FT->isVarArg() && !PrintedArg) {
1645 FunctionInnards << "void"; // ret() -> ret(void) in C.
1647 FunctionInnards << ')';
1649 // Get the return tpe for the function.
1651 if (!isCStructReturn)
1652 RetTy = F->getReturnType();
1654 // If this is a struct-return function, print the struct-return type.
1655 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1658 // Print out the return type and the signature built above.
1659 printType(Out, RetTy, FunctionInnards.str());
1662 void CWriter::printFunction(Function &F) {
1663 printFunctionSignature(&F, false);
1666 // If this is a struct return function, handle the result with magic.
1667 if (F.getCallingConv() == CallingConv::CSRet) {
1668 const Type *StructTy =
1669 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1671 printType(Out, StructTy, "StructReturn");
1672 Out << "; /* Struct return temporary */\n";
1675 printType(Out, F.arg_begin()->getType(), Mang->getValueName(F.arg_begin()));
1676 Out << " = &StructReturn;\n";
1679 bool PrintedVar = false;
1681 // print local variable information for the function
1682 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I)
1683 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1685 printType(Out, AI->getAllocatedType(), Mang->getValueName(AI));
1686 Out << "; /* Address-exposed local */\n";
1688 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1690 printType(Out, I->getType(), Mang->getValueName(&*I));
1693 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1695 printType(Out, I->getType(),
1696 Mang->getValueName(&*I)+"__PHI_TEMPORARY");
1705 if (F.hasExternalLinkage() && F.getName() == "main")
1706 Out << " CODE_FOR_MAIN();\n";
1708 // print the basic blocks
1709 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1710 if (Loop *L = LI->getLoopFor(BB)) {
1711 if (L->getHeader() == BB && L->getParentLoop() == 0)
1714 printBasicBlock(BB);
1721 void CWriter::printLoop(Loop *L) {
1722 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1723 << "' to make GCC happy */\n";
1724 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1725 BasicBlock *BB = L->getBlocks()[i];
1726 Loop *BBLoop = LI->getLoopFor(BB);
1728 printBasicBlock(BB);
1729 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
1732 Out << " } while (1); /* end of syntactic loop '"
1733 << L->getHeader()->getName() << "' */\n";
1736 void CWriter::printBasicBlock(BasicBlock *BB) {
1738 // Don't print the label for the basic block if there are no uses, or if
1739 // the only terminator use is the predecessor basic block's terminator.
1740 // We have to scan the use list because PHI nodes use basic blocks too but
1741 // do not require a label to be generated.
1743 bool NeedsLabel = false;
1744 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
1745 if (isGotoCodeNecessary(*PI, BB)) {
1750 if (NeedsLabel) Out << Mang->getValueName(BB) << ":\n";
1752 // Output all of the instructions in the basic block...
1753 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
1755 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
1756 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
1765 // Don't emit prefix or suffix for the terminator...
1766 visit(*BB->getTerminator());
1770 // Specific Instruction type classes... note that all of the casts are
1771 // necessary because we use the instruction classes as opaque types...
1773 void CWriter::visitReturnInst(ReturnInst &I) {
1774 // If this is a struct return function, return the temporary struct.
1775 if (I.getParent()->getParent()->getCallingConv() == CallingConv::CSRet) {
1776 Out << " return StructReturn;\n";
1780 // Don't output a void return if this is the last basic block in the function
1781 if (I.getNumOperands() == 0 &&
1782 &*--I.getParent()->getParent()->end() == I.getParent() &&
1783 !I.getParent()->size() == 1) {
1788 if (I.getNumOperands()) {
1790 writeOperand(I.getOperand(0));
1795 void CWriter::visitSwitchInst(SwitchInst &SI) {
1798 writeOperand(SI.getOperand(0));
1799 Out << ") {\n default:\n";
1800 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
1801 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
1803 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
1805 writeOperand(SI.getOperand(i));
1807 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
1808 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
1809 printBranchToBlock(SI.getParent(), Succ, 2);
1810 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
1816 void CWriter::visitUnreachableInst(UnreachableInst &I) {
1817 Out << " /*UNREACHABLE*/;\n";
1820 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
1821 /// FIXME: This should be reenabled, but loop reordering safe!!
1824 if (next(Function::iterator(From)) != Function::iterator(To))
1825 return true; // Not the direct successor, we need a goto.
1827 //isa<SwitchInst>(From->getTerminator())
1829 if (LI->getLoopFor(From) != LI->getLoopFor(To))
1834 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
1835 BasicBlock *Successor,
1837 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
1838 PHINode *PN = cast<PHINode>(I);
1839 // Now we have to do the printing.
1840 Value *IV = PN->getIncomingValueForBlock(CurBlock);
1841 if (!isa<UndefValue>(IV)) {
1842 Out << std::string(Indent, ' ');
1843 Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = ";
1845 Out << "; /* for PHI node */\n";
1850 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
1852 if (isGotoCodeNecessary(CurBB, Succ)) {
1853 Out << std::string(Indent, ' ') << " goto ";
1859 // Branch instruction printing - Avoid printing out a branch to a basic block
1860 // that immediately succeeds the current one.
1862 void CWriter::visitBranchInst(BranchInst &I) {
1864 if (I.isConditional()) {
1865 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
1867 writeOperand(I.getCondition());
1870 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
1871 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
1873 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
1874 Out << " } else {\n";
1875 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
1876 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
1879 // First goto not necessary, assume second one is...
1881 writeOperand(I.getCondition());
1884 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
1885 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
1890 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
1891 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
1896 // PHI nodes get copied into temporary values at the end of predecessor basic
1897 // blocks. We now need to copy these temporary values into the REAL value for
1899 void CWriter::visitPHINode(PHINode &I) {
1901 Out << "__PHI_TEMPORARY";
1905 void CWriter::visitBinaryOperator(Instruction &I) {
1906 // binary instructions, shift instructions, setCond instructions.
1907 assert(!isa<PointerType>(I.getType()));
1909 // We must cast the results of binary operations which might be promoted.
1910 bool needsCast = false;
1911 if ((I.getType() == Type::UByteTy) || (I.getType() == Type::SByteTy)
1912 || (I.getType() == Type::UShortTy) || (I.getType() == Type::ShortTy)
1913 || (I.getType() == Type::FloatTy)) {
1916 printType(Out, I.getType());
1920 // If this is a negation operation, print it out as such. For FP, we don't
1921 // want to print "-0.0 - X".
1922 if (BinaryOperator::isNeg(&I)) {
1924 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
1926 } else if (I.getOpcode() == Instruction::FRem) {
1927 // Output a call to fmod/fmodf instead of emitting a%b
1928 if (I.getType() == Type::FloatTy)
1932 writeOperand(I.getOperand(0));
1934 writeOperand(I.getOperand(1));
1938 // Write out the cast of the instruction's value back to the proper type
1940 bool NeedsClosingParens = writeInstructionCast(I);
1942 // Certain instructions require the operand to be forced to a specific type
1943 // so we use writeOperandWithCast here instead of writeOperand. Similarly
1944 // below for operand 1
1945 writeOperandWithCast(I.getOperand(0), I.getOpcode());
1947 switch (I.getOpcode()) {
1948 case Instruction::Add: Out << " + "; break;
1949 case Instruction::Sub: Out << " - "; break;
1950 case Instruction::Mul: Out << '*'; break;
1951 case Instruction::URem:
1952 case Instruction::SRem:
1953 case Instruction::FRem: Out << '%'; break;
1954 case Instruction::UDiv:
1955 case Instruction::SDiv:
1956 case Instruction::FDiv: Out << '/'; break;
1957 case Instruction::And: Out << " & "; break;
1958 case Instruction::Or: Out << " | "; break;
1959 case Instruction::Xor: Out << " ^ "; break;
1960 case Instruction::SetEQ: Out << " == "; break;
1961 case Instruction::SetNE: Out << " != "; break;
1962 case Instruction::SetLE: Out << " <= "; break;
1963 case Instruction::SetGE: Out << " >= "; break;
1964 case Instruction::SetLT: Out << " < "; break;
1965 case Instruction::SetGT: Out << " > "; break;
1966 case Instruction::Shl : Out << " << "; break;
1967 case Instruction::LShr:
1968 case Instruction::AShr: Out << " >> "; break;
1969 default: std::cerr << "Invalid operator type!" << I; abort();
1972 writeOperandWithCast(I.getOperand(1), I.getOpcode());
1973 if (NeedsClosingParens)
1982 void CWriter::visitCastInst(CastInst &I) {
1983 const Type *DstTy = I.getType();
1984 const Type *SrcTy = I.getOperand(0)->getType();
1986 printCast(I.getOpcode(), SrcTy, DstTy);
1987 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::BoolTy) {
1988 // Make sure we really get a sext from bool by subtracing the bool from 0
1991 writeOperand(I.getOperand(0));
1992 if (DstTy == Type::BoolTy &&
1993 (I.getOpcode() == Instruction::Trunc ||
1994 I.getOpcode() == Instruction::FPToUI ||
1995 I.getOpcode() == Instruction::FPToSI ||
1996 I.getOpcode() == Instruction::PtrToInt)) {
1997 // Make sure we really get a trunc to bool by anding the operand with 1
2003 void CWriter::visitSelectInst(SelectInst &I) {
2005 writeOperand(I.getCondition());
2007 writeOperand(I.getTrueValue());
2009 writeOperand(I.getFalseValue());
2014 void CWriter::lowerIntrinsics(Function &F) {
2015 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2016 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2017 if (CallInst *CI = dyn_cast<CallInst>(I++))
2018 if (Function *F = CI->getCalledFunction())
2019 switch (F->getIntrinsicID()) {
2020 case Intrinsic::not_intrinsic:
2021 case Intrinsic::vastart:
2022 case Intrinsic::vacopy:
2023 case Intrinsic::vaend:
2024 case Intrinsic::returnaddress:
2025 case Intrinsic::frameaddress:
2026 case Intrinsic::setjmp:
2027 case Intrinsic::longjmp:
2028 case Intrinsic::prefetch:
2029 case Intrinsic::dbg_stoppoint:
2030 case Intrinsic::powi_f32:
2031 case Intrinsic::powi_f64:
2032 // We directly implement these intrinsics
2035 // If this is an intrinsic that directly corresponds to a GCC
2036 // builtin, we handle it.
2037 const char *BuiltinName = "";
2038 #define GET_GCC_BUILTIN_NAME
2039 #include "llvm/Intrinsics.gen"
2040 #undef GET_GCC_BUILTIN_NAME
2041 // If we handle it, don't lower it.
2042 if (BuiltinName[0]) break;
2044 // All other intrinsic calls we must lower.
2045 Instruction *Before = 0;
2046 if (CI != &BB->front())
2047 Before = prior(BasicBlock::iterator(CI));
2049 IL.LowerIntrinsicCall(CI);
2050 if (Before) { // Move iterator to instruction after call
2061 void CWriter::visitCallInst(CallInst &I) {
2062 //check if we have inline asm
2063 if (isInlineAsm(I)) {
2068 bool WroteCallee = false;
2070 // Handle intrinsic function calls first...
2071 if (Function *F = I.getCalledFunction())
2072 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2075 // If this is an intrinsic that directly corresponds to a GCC
2076 // builtin, we emit it here.
2077 const char *BuiltinName = "";
2078 #define GET_GCC_BUILTIN_NAME
2079 #include "llvm/Intrinsics.gen"
2080 #undef GET_GCC_BUILTIN_NAME
2081 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2087 case Intrinsic::vastart:
2090 Out << "va_start(*(va_list*)";
2091 writeOperand(I.getOperand(1));
2093 // Output the last argument to the enclosing function...
2094 if (I.getParent()->getParent()->arg_empty()) {
2095 std::cerr << "The C backend does not currently support zero "
2096 << "argument varargs functions, such as '"
2097 << I.getParent()->getParent()->getName() << "'!\n";
2100 writeOperand(--I.getParent()->getParent()->arg_end());
2103 case Intrinsic::vaend:
2104 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2105 Out << "0; va_end(*(va_list*)";
2106 writeOperand(I.getOperand(1));
2109 Out << "va_end(*(va_list*)0)";
2112 case Intrinsic::vacopy:
2114 Out << "va_copy(*(va_list*)";
2115 writeOperand(I.getOperand(1));
2116 Out << ", *(va_list*)";
2117 writeOperand(I.getOperand(2));
2120 case Intrinsic::returnaddress:
2121 Out << "__builtin_return_address(";
2122 writeOperand(I.getOperand(1));
2125 case Intrinsic::frameaddress:
2126 Out << "__builtin_frame_address(";
2127 writeOperand(I.getOperand(1));
2130 case Intrinsic::powi_f32:
2131 case Intrinsic::powi_f64:
2132 Out << "__builtin_powi(";
2133 writeOperand(I.getOperand(1));
2135 writeOperand(I.getOperand(2));
2138 case Intrinsic::setjmp:
2139 #if defined(HAVE__SETJMP) && defined(HAVE__LONGJMP)
2140 Out << "_"; // Use _setjmp on systems that support it!
2142 Out << "setjmp(*(jmp_buf*)";
2143 writeOperand(I.getOperand(1));
2146 case Intrinsic::longjmp:
2147 #if defined(HAVE__SETJMP) && defined(HAVE__LONGJMP)
2148 Out << "_"; // Use _longjmp on systems that support it!
2150 Out << "longjmp(*(jmp_buf*)";
2151 writeOperand(I.getOperand(1));
2153 writeOperand(I.getOperand(2));
2156 case Intrinsic::prefetch:
2157 Out << "LLVM_PREFETCH((const void *)";
2158 writeOperand(I.getOperand(1));
2160 writeOperand(I.getOperand(2));
2162 writeOperand(I.getOperand(3));
2165 case Intrinsic::dbg_stoppoint: {
2166 // If we use writeOperand directly we get a "u" suffix which is rejected
2168 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2172 << " \"" << SPI.getDirectory()
2173 << SPI.getFileName() << "\"\n";
2179 Value *Callee = I.getCalledValue();
2181 // If this is a call to a struct-return function, assign to the first
2182 // parameter instead of passing it to the call.
2183 bool isStructRet = I.getCallingConv() == CallingConv::CSRet;
2186 writeOperand(I.getOperand(1));
2190 if (I.isTailCall()) Out << " /*tail*/ ";
2192 const PointerType *PTy = cast<PointerType>(Callee->getType());
2193 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2196 // If this is an indirect call to a struct return function, we need to cast
2198 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2200 // GCC is a real PITA. It does not permit codegening casts of functions to
2201 // function pointers if they are in a call (it generates a trap instruction
2202 // instead!). We work around this by inserting a cast to void* in between
2203 // the function and the function pointer cast. Unfortunately, we can't just
2204 // form the constant expression here, because the folder will immediately
2207 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2208 // that void* and function pointers have the same size. :( To deal with this
2209 // in the common case, we handle casts where the number of arguments passed
2212 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2214 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2220 // Ok, just cast the pointer type.
2223 printType(Out, I.getCalledValue()->getType());
2225 printStructReturnPointerFunctionType(Out,
2226 cast<PointerType>(I.getCalledValue()->getType()));
2229 writeOperand(Callee);
2230 if (NeedsCast) Out << ')';
2235 unsigned NumDeclaredParams = FTy->getNumParams();
2237 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2239 if (isStructRet) { // Skip struct return argument.
2244 bool PrintedArg = false;
2245 for (; AI != AE; ++AI, ++ArgNo) {
2246 if (PrintedArg) Out << ", ";
2247 if (ArgNo < NumDeclaredParams &&
2248 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2250 printType(Out, FTy->getParamType(ArgNo));
2260 //This converts the llvm constraint string to something gcc is expecting.
2261 //TODO: work out platform independent constraints and factor those out
2262 // of the per target tables
2263 // handle multiple constraint codes
2264 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2266 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2268 //catch numeric constraints
2269 if (c.Codes[0].find_first_not_of("0123456789") >= c.Codes[0].size())
2272 const char** table = 0;
2274 //Grab the translation table from TargetAsmInfo if it exists
2277 const TargetMachineRegistry::Entry* Match =
2278 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2280 //Per platform Target Machines don't exist, so create it
2281 // this must be done only once
2282 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2283 TAsm = TM->getTargetAsmInfo();
2287 table = TAsm->getAsmCBE();
2289 //Search the translation table if it exists
2290 for (int i = 0; table && table[i]; i += 2)
2291 if (c.Codes[0] == table[i])
2294 assert(0 && "Unknown Asm Constraint");
2298 //TODO: import logic from AsmPrinter.cpp
2299 static std::string gccifyAsm(std::string asmstr) {
2300 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2301 if (asmstr[i] == '\n')
2302 asmstr.replace(i, 1, "\\n");
2303 else if (asmstr[i] == '\t')
2304 asmstr.replace(i, 1, "\\t");
2305 else if (asmstr[i] == '$') {
2306 if (asmstr[i + 1] == '{') {
2307 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2308 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2309 std::string n = "%" +
2310 asmstr.substr(a + 1, b - a - 1) +
2311 asmstr.substr(i + 2, a - i - 2);
2312 asmstr.replace(i, b - i + 1, n);
2315 asmstr.replace(i, 1, "%");
2317 else if (asmstr[i] == '%')//grr
2318 { asmstr.replace(i, 1, "%%"); ++i;}
2323 //TODO: assumptions about what consume arguments from the call are likely wrong
2324 // handle communitivity
2325 void CWriter::visitInlineAsm(CallInst &CI) {
2326 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2327 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2328 std::vector<std::pair<std::string, Value*> > Input;
2329 std::vector<std::pair<std::string, Value*> > Output;
2330 std::string Clobber;
2331 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2332 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2333 E = Constraints.end(); I != E; ++I) {
2334 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2336 InterpretASMConstraint(*I);
2339 assert(0 && "Unknown asm constraint");
2341 case InlineAsm::isInput: {
2343 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2344 ++count; //consume arg
2348 case InlineAsm::isOutput: {
2350 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2351 count ? CI.getOperand(count) : &CI));
2352 ++count; //consume arg
2356 case InlineAsm::isClobber: {
2358 Clobber += ",\"" + c + "\"";
2364 //fix up the asm string for gcc
2365 std::string asmstr = gccifyAsm(as->getAsmString());
2367 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2369 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2370 E = Output.end(); I != E; ++I) {
2371 Out << "\"" << I->first << "\"(";
2372 writeOperandRaw(I->second);
2378 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2379 E = Input.end(); I != E; ++I) {
2380 Out << "\"" << I->first << "\"(";
2381 writeOperandRaw(I->second);
2386 Out << "\n :" << Clobber.substr(1) << ")\n";
2389 void CWriter::visitMallocInst(MallocInst &I) {
2390 assert(0 && "lowerallocations pass didn't work!");
2393 void CWriter::visitAllocaInst(AllocaInst &I) {
2395 printType(Out, I.getType());
2396 Out << ") alloca(sizeof(";
2397 printType(Out, I.getType()->getElementType());
2399 if (I.isArrayAllocation()) {
2401 writeOperand(I.getOperand(0));
2406 void CWriter::visitFreeInst(FreeInst &I) {
2407 assert(0 && "lowerallocations pass didn't work!");
2410 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2411 gep_type_iterator E) {
2412 bool HasImplicitAddress = false;
2413 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2414 if (isa<GlobalValue>(Ptr)) {
2415 HasImplicitAddress = true;
2416 } else if (isDirectAlloca(Ptr)) {
2417 HasImplicitAddress = true;
2421 if (!HasImplicitAddress)
2422 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2424 writeOperandInternal(Ptr);
2428 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2429 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2432 writeOperandInternal(Ptr);
2434 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2436 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2439 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2440 "Can only have implicit address with direct accessing");
2442 if (HasImplicitAddress) {
2444 } else if (CI && CI->isNullValue()) {
2445 gep_type_iterator TmpI = I; ++TmpI;
2447 // Print out the -> operator if possible...
2448 if (TmpI != E && isa<StructType>(*TmpI)) {
2449 Out << (HasImplicitAddress ? "." : "->");
2450 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2456 if (isa<StructType>(*I)) {
2457 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2460 writeOperand(I.getOperand());
2465 void CWriter::visitLoadInst(LoadInst &I) {
2467 if (I.isVolatile()) {
2469 printType(Out, I.getType(), "volatile*");
2473 writeOperand(I.getOperand(0));
2479 void CWriter::visitStoreInst(StoreInst &I) {
2481 if (I.isVolatile()) {
2483 printType(Out, I.getOperand(0)->getType(), " volatile*");
2486 writeOperand(I.getPointerOperand());
2487 if (I.isVolatile()) Out << ')';
2489 writeOperand(I.getOperand(0));
2492 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2494 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2498 void CWriter::visitVAArgInst(VAArgInst &I) {
2499 Out << "va_arg(*(va_list*)";
2500 writeOperand(I.getOperand(0));
2502 printType(Out, I.getType());
2506 //===----------------------------------------------------------------------===//
2507 // External Interface declaration
2508 //===----------------------------------------------------------------------===//
2510 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2512 CodeGenFileType FileType,
2514 if (FileType != TargetMachine::AssemblyFile) return true;
2516 PM.add(createLowerGCPass());
2517 PM.add(createLowerAllocationsPass(true));
2518 PM.add(createLowerInvokePass());
2519 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2520 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2521 PM.add(new CWriter(o));