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"
49 // Register the target.
50 RegisterTarget<CTargetMachine> X("c", " C backend");
52 /// CBackendNameAllUsedStructsAndMergeFunctions - This pass inserts names for
53 /// any unnamed structure types that are used by the program, and merges
54 /// external functions with the same name.
56 class CBackendNameAllUsedStructsAndMergeFunctions : public ModulePass {
57 void getAnalysisUsage(AnalysisUsage &AU) const {
58 AU.addRequired<FindUsedTypes>();
61 virtual const char *getPassName() const {
62 return "C backend type canonicalizer";
65 virtual bool runOnModule(Module &M);
68 /// CWriter - This class is the main chunk of code that converts an LLVM
69 /// module to a C translation unit.
70 class CWriter : public FunctionPass, public InstVisitor<CWriter> {
75 const Module *TheModule;
76 const TargetAsmInfo* TAsm;
77 std::map<const Type *, std::string> TypeNames;
79 std::map<const ConstantFP *, unsigned> FPConstantMap;
81 CWriter(std::ostream &o) : Out(o), TAsm(0) {}
83 virtual const char *getPassName() const { return "C backend"; }
85 void getAnalysisUsage(AnalysisUsage &AU) const {
86 AU.addRequired<LoopInfo>();
90 virtual bool doInitialization(Module &M);
92 bool runOnFunction(Function &F) {
93 LI = &getAnalysis<LoopInfo>();
95 // Get rid of intrinsics we can't handle.
98 // Output all floating point constants that cannot be printed accurately.
99 printFloatingPointConstants(F);
101 // Ensure that no local symbols conflict with global symbols.
102 F.renameLocalSymbols();
105 FPConstantMap.clear();
109 virtual bool doFinalization(Module &M) {
116 std::ostream &printType(std::ostream &Out, const Type *Ty,
117 const std::string &VariableName = "",
118 bool IgnoreName = false);
119 std::ostream &printPrimitiveType(std::ostream &Out, const Type *Ty,
121 const std::string &NameSoFar = "");
123 void printStructReturnPointerFunctionType(std::ostream &Out,
124 const PointerType *Ty);
126 void writeOperand(Value *Operand);
127 void writeOperandRaw(Value *Operand);
128 void writeOperandInternal(Value *Operand);
129 void writeOperandWithCast(Value* Operand, unsigned Opcode);
130 void writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate);
131 bool writeInstructionCast(const Instruction &I);
134 std::string InterpretASMConstraint(InlineAsm::ConstraintInfo& c);
136 void lowerIntrinsics(Function &F);
138 void printModule(Module *M);
139 void printModuleTypes(const SymbolTable &ST);
140 void printContainedStructs(const Type *Ty, std::set<const StructType *> &);
141 void printFloatingPointConstants(Function &F);
142 void printFunctionSignature(const Function *F, bool Prototype);
144 void printFunction(Function &);
145 void printBasicBlock(BasicBlock *BB);
146 void printLoop(Loop *L);
148 void printCast(unsigned opcode, const Type *SrcTy, const Type *DstTy);
149 void printConstant(Constant *CPV);
150 void printConstantWithCast(Constant *CPV, unsigned Opcode);
151 bool printConstExprCast(const ConstantExpr *CE);
152 void printConstantArray(ConstantArray *CPA);
153 void printConstantPacked(ConstantPacked *CP);
155 // isInlinableInst - Attempt to inline instructions into their uses to build
156 // trees as much as possible. To do this, we have to consistently decide
157 // what is acceptable to inline, so that variable declarations don't get
158 // printed and an extra copy of the expr is not emitted.
160 static bool isInlinableInst(const Instruction &I) {
161 // Always inline cmp instructions, even if they are shared by multiple
162 // expressions. GCC generates horrible code if we don't.
166 // Must be an expression, must be used exactly once. If it is dead, we
167 // emit it inline where it would go.
168 if (I.getType() == Type::VoidTy || !I.hasOneUse() ||
169 isa<TerminatorInst>(I) || isa<CallInst>(I) || isa<PHINode>(I) ||
170 isa<LoadInst>(I) || isa<VAArgInst>(I))
171 // Don't inline a load across a store or other bad things!
174 // Must not be used in inline asm
175 if (I.hasOneUse() && isInlineAsm(*I.use_back())) return false;
177 // Only inline instruction it if it's use is in the same BB as the inst.
178 return I.getParent() == cast<Instruction>(I.use_back())->getParent();
181 // isDirectAlloca - Define fixed sized allocas in the entry block as direct
182 // variables which are accessed with the & operator. This causes GCC to
183 // generate significantly better code than to emit alloca calls directly.
185 static const AllocaInst *isDirectAlloca(const Value *V) {
186 const AllocaInst *AI = dyn_cast<AllocaInst>(V);
187 if (!AI) return false;
188 if (AI->isArrayAllocation())
189 return 0; // FIXME: we can also inline fixed size array allocas!
190 if (AI->getParent() != &AI->getParent()->getParent()->getEntryBlock())
195 // isInlineAsm - Check if the instruction is a call to an inline asm chunk
196 static bool isInlineAsm(const Instruction& I) {
197 if (isa<CallInst>(&I) && isa<InlineAsm>(I.getOperand(0)))
202 // Instruction visitation functions
203 friend class InstVisitor<CWriter>;
205 void visitReturnInst(ReturnInst &I);
206 void visitBranchInst(BranchInst &I);
207 void visitSwitchInst(SwitchInst &I);
208 void visitInvokeInst(InvokeInst &I) {
209 assert(0 && "Lowerinvoke pass didn't work!");
212 void visitUnwindInst(UnwindInst &I) {
213 assert(0 && "Lowerinvoke pass didn't work!");
215 void visitUnreachableInst(UnreachableInst &I);
217 void visitPHINode(PHINode &I);
218 void visitBinaryOperator(Instruction &I);
219 void visitICmpInst(ICmpInst &I);
220 void visitFCmpInst(FCmpInst &I);
222 void visitCastInst (CastInst &I);
223 void visitSelectInst(SelectInst &I);
224 void visitCallInst (CallInst &I);
225 void visitInlineAsm(CallInst &I);
226 void visitShiftInst(ShiftInst &I) { visitBinaryOperator(I); }
228 void visitMallocInst(MallocInst &I);
229 void visitAllocaInst(AllocaInst &I);
230 void visitFreeInst (FreeInst &I);
231 void visitLoadInst (LoadInst &I);
232 void visitStoreInst (StoreInst &I);
233 void visitGetElementPtrInst(GetElementPtrInst &I);
234 void visitVAArgInst (VAArgInst &I);
236 void visitInstruction(Instruction &I) {
237 cerr << "C Writer does not know about " << I;
241 void outputLValue(Instruction *I) {
242 Out << " " << Mang->getValueName(I) << " = ";
245 bool isGotoCodeNecessary(BasicBlock *From, BasicBlock *To);
246 void printPHICopiesForSuccessor(BasicBlock *CurBlock,
247 BasicBlock *Successor, unsigned Indent);
248 void printBranchToBlock(BasicBlock *CurBlock, BasicBlock *SuccBlock,
250 void printIndexingExpression(Value *Ptr, gep_type_iterator I,
251 gep_type_iterator E);
255 /// This method inserts names for any unnamed structure types that are used by
256 /// the program, and removes names from structure types that are not used by the
259 bool CBackendNameAllUsedStructsAndMergeFunctions::runOnModule(Module &M) {
260 // Get a set of types that are used by the program...
261 std::set<const Type *> UT = getAnalysis<FindUsedTypes>().getTypes();
263 // Loop over the module symbol table, removing types from UT that are
264 // already named, and removing names for types that are not used.
266 SymbolTable &MST = M.getSymbolTable();
267 for (SymbolTable::type_iterator TI = MST.type_begin(), TE = MST.type_end();
269 SymbolTable::type_iterator I = TI++;
271 // If this is not used, remove it from the symbol table.
272 std::set<const Type *>::iterator UTI = UT.find(I->second);
276 UT.erase(UTI); // Only keep one name for this type.
279 // UT now contains types that are not named. Loop over it, naming
282 bool Changed = false;
283 unsigned RenameCounter = 0;
284 for (std::set<const Type *>::const_iterator I = UT.begin(), E = UT.end();
286 if (const StructType *ST = dyn_cast<StructType>(*I)) {
287 while (M.addTypeName("unnamed"+utostr(RenameCounter), ST))
293 // Loop over all external functions and globals. If we have two with
294 // identical names, merge them.
295 // FIXME: This code should disappear when we don't allow values with the same
296 // names when they have different types!
297 std::map<std::string, GlobalValue*> ExtSymbols;
298 for (Module::iterator I = M.begin(), E = M.end(); I != E;) {
300 if (GV->isExternal() && GV->hasName()) {
301 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
302 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
304 // Found a conflict, replace this global with the previous one.
305 GlobalValue *OldGV = X.first->second;
306 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
307 GV->eraseFromParent();
312 // Do the same for globals.
313 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
315 GlobalVariable *GV = I++;
316 if (GV->isExternal() && GV->hasName()) {
317 std::pair<std::map<std::string, GlobalValue*>::iterator, bool> X
318 = ExtSymbols.insert(std::make_pair(GV->getName(), GV));
320 // Found a conflict, replace this global with the previous one.
321 GlobalValue *OldGV = X.first->second;
322 GV->replaceAllUsesWith(ConstantExpr::getBitCast(OldGV, GV->getType()));
323 GV->eraseFromParent();
332 /// printStructReturnPointerFunctionType - This is like printType for a struct
333 /// return type, except, instead of printing the type as void (*)(Struct*, ...)
334 /// print it as "Struct (*)(...)", for struct return functions.
335 void CWriter::printStructReturnPointerFunctionType(std::ostream &Out,
336 const PointerType *TheTy) {
337 const FunctionType *FTy = cast<FunctionType>(TheTy->getElementType());
338 std::stringstream FunctionInnards;
339 FunctionInnards << " (*) (";
340 bool PrintedType = false;
342 FunctionType::param_iterator I = FTy->param_begin(), E = FTy->param_end();
343 const Type *RetTy = cast<PointerType>(I->get())->getElementType();
344 for (++I; I != E; ++I) {
346 FunctionInnards << ", ";
347 printType(FunctionInnards, *I, "");
350 if (FTy->isVarArg()) {
352 FunctionInnards << ", ...";
353 } else if (!PrintedType) {
354 FunctionInnards << "void";
356 FunctionInnards << ')';
357 std::string tstr = FunctionInnards.str();
358 printType(Out, RetTy, tstr);
362 CWriter::printPrimitiveType(std::ostream &Out, const Type *Ty, bool isSigned,
363 const std::string &NameSoFar) {
364 assert(Ty->isPrimitiveType() && "Invalid type for printPrimitiveType");
365 switch (Ty->getTypeID()) {
366 case Type::VoidTyID: return Out << "void " << NameSoFar;
367 case Type::BoolTyID: return Out << "bool " << NameSoFar;
369 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
370 case Type::Int16TyID:
371 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
372 case Type::Int32TyID:
373 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
374 case Type::Int64TyID:
375 return Out << (isSigned?"signed":"unsigned") << " long long " << NameSoFar;
376 case Type::FloatTyID: return Out << "float " << NameSoFar;
377 case Type::DoubleTyID: return Out << "double " << NameSoFar;
379 cerr << "Unknown primitive type: " << *Ty << "\n";
384 // Pass the Type* and the variable name and this prints out the variable
387 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
388 const std::string &NameSoFar,
390 if (Ty->isPrimitiveType()) {
391 // FIXME:Signedness. When integer types are signless, this should just
392 // always pass "false" for the sign of the primitive type. The instructions
393 // will figure out how the value is to be interpreted.
394 printPrimitiveType(Out, Ty, true, NameSoFar);
398 // Check to see if the type is named.
399 if (!IgnoreName || isa<OpaqueType>(Ty)) {
400 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
401 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
404 switch (Ty->getTypeID()) {
405 case Type::FunctionTyID: {
406 const FunctionType *FTy = cast<FunctionType>(Ty);
407 std::stringstream FunctionInnards;
408 FunctionInnards << " (" << NameSoFar << ") (";
409 for (FunctionType::param_iterator I = FTy->param_begin(),
410 E = FTy->param_end(); I != E; ++I) {
411 if (I != FTy->param_begin())
412 FunctionInnards << ", ";
413 printType(FunctionInnards, *I, "");
415 if (FTy->isVarArg()) {
416 if (FTy->getNumParams())
417 FunctionInnards << ", ...";
418 } else if (!FTy->getNumParams()) {
419 FunctionInnards << "void";
421 FunctionInnards << ')';
422 std::string tstr = FunctionInnards.str();
423 printType(Out, FTy->getReturnType(), tstr);
426 case Type::StructTyID: {
427 const StructType *STy = cast<StructType>(Ty);
428 Out << NameSoFar + " {\n";
430 for (StructType::element_iterator I = STy->element_begin(),
431 E = STy->element_end(); I != E; ++I) {
433 printType(Out, *I, "field" + utostr(Idx++));
439 case Type::PointerTyID: {
440 const PointerType *PTy = cast<PointerType>(Ty);
441 std::string ptrName = "*" + NameSoFar;
443 if (isa<ArrayType>(PTy->getElementType()) ||
444 isa<PackedType>(PTy->getElementType()))
445 ptrName = "(" + ptrName + ")";
447 return printType(Out, PTy->getElementType(), ptrName);
450 case Type::ArrayTyID: {
451 const ArrayType *ATy = cast<ArrayType>(Ty);
452 unsigned NumElements = ATy->getNumElements();
453 if (NumElements == 0) NumElements = 1;
454 return printType(Out, ATy->getElementType(),
455 NameSoFar + "[" + utostr(NumElements) + "]");
458 case Type::PackedTyID: {
459 const PackedType *PTy = cast<PackedType>(Ty);
460 unsigned NumElements = PTy->getNumElements();
461 if (NumElements == 0) NumElements = 1;
462 return printType(Out, PTy->getElementType(),
463 NameSoFar + "[" + utostr(NumElements) + "]");
466 case Type::OpaqueTyID: {
467 static int Count = 0;
468 std::string TyName = "struct opaque_" + itostr(Count++);
469 assert(TypeNames.find(Ty) == TypeNames.end());
470 TypeNames[Ty] = TyName;
471 return Out << TyName << ' ' << NameSoFar;
474 assert(0 && "Unhandled case in getTypeProps!");
481 void CWriter::printConstantArray(ConstantArray *CPA) {
483 // As a special case, print the array as a string if it is an array of
484 // ubytes or an array of sbytes with positive values.
486 const Type *ETy = CPA->getType()->getElementType();
487 bool isString = (ETy == Type::Int8Ty || ETy == Type::Int8Ty);
489 // Make sure the last character is a null char, as automatically added by C
490 if (isString && (CPA->getNumOperands() == 0 ||
491 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
496 // Keep track of whether the last number was a hexadecimal escape
497 bool LastWasHex = false;
499 // Do not include the last character, which we know is null
500 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
501 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
503 // Print it out literally if it is a printable character. The only thing
504 // to be careful about is when the last letter output was a hex escape
505 // code, in which case we have to be careful not to print out hex digits
506 // explicitly (the C compiler thinks it is a continuation of the previous
507 // character, sheesh...)
509 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
511 if (C == '"' || C == '\\')
518 case '\n': Out << "\\n"; break;
519 case '\t': Out << "\\t"; break;
520 case '\r': Out << "\\r"; break;
521 case '\v': Out << "\\v"; break;
522 case '\a': Out << "\\a"; break;
523 case '\"': Out << "\\\""; break;
524 case '\'': Out << "\\\'"; break;
527 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
528 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
537 if (CPA->getNumOperands()) {
539 printConstant(cast<Constant>(CPA->getOperand(0)));
540 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
542 printConstant(cast<Constant>(CPA->getOperand(i)));
549 void CWriter::printConstantPacked(ConstantPacked *CP) {
551 if (CP->getNumOperands()) {
553 printConstant(cast<Constant>(CP->getOperand(0)));
554 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
556 printConstant(cast<Constant>(CP->getOperand(i)));
562 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
563 // textually as a double (rather than as a reference to a stack-allocated
564 // variable). We decide this by converting CFP to a string and back into a
565 // double, and then checking whether the conversion results in a bit-equal
566 // double to the original value of CFP. This depends on us and the target C
567 // compiler agreeing on the conversion process (which is pretty likely since we
568 // only deal in IEEE FP).
570 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
571 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
573 sprintf(Buffer, "%a", CFP->getValue());
575 if (!strncmp(Buffer, "0x", 2) ||
576 !strncmp(Buffer, "-0x", 3) ||
577 !strncmp(Buffer, "+0x", 3))
578 return atof(Buffer) == CFP->getValue();
581 std::string StrVal = ftostr(CFP->getValue());
583 while (StrVal[0] == ' ')
584 StrVal.erase(StrVal.begin());
586 // Check to make sure that the stringized number is not some string like "Inf"
587 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
588 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
589 ((StrVal[0] == '-' || StrVal[0] == '+') &&
590 (StrVal[1] >= '0' && StrVal[1] <= '9')))
591 // Reparse stringized version!
592 return atof(StrVal.c_str()) == CFP->getValue();
597 /// Print out the casting for a cast operation. This does the double casting
598 /// necessary for conversion to the destination type, if necessary.
599 /// @brief Print a cast
600 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
601 // Print the destination type cast
603 case Instruction::UIToFP:
604 case Instruction::SIToFP:
605 case Instruction::IntToPtr:
606 case Instruction::Trunc:
607 case Instruction::BitCast:
608 case Instruction::FPExt:
609 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
611 printType(Out, DstTy);
614 case Instruction::ZExt:
615 case Instruction::PtrToInt:
616 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
618 printPrimitiveType(Out, DstTy, false);
621 case Instruction::SExt:
622 case Instruction::FPToSI: // For these, make sure we get a signed dest
624 printPrimitiveType(Out, DstTy, true);
628 assert(0 && "Invalid cast opcode");
631 // Print the source type cast
633 case Instruction::UIToFP:
634 case Instruction::ZExt:
636 printPrimitiveType(Out, SrcTy, false);
639 case Instruction::SIToFP:
640 case Instruction::SExt:
642 printPrimitiveType(Out, SrcTy, true);
645 case Instruction::IntToPtr:
646 case Instruction::PtrToInt:
647 // Avoid "cast to pointer from integer of different size" warnings
648 Out << "(unsigned long)";
650 case Instruction::Trunc:
651 case Instruction::BitCast:
652 case Instruction::FPExt:
653 case Instruction::FPTrunc:
654 case Instruction::FPToSI:
655 case Instruction::FPToUI:
656 break; // These don't need a source cast.
658 assert(0 && "Invalid cast opcode");
663 // printConstant - The LLVM Constant to C Constant converter.
664 void CWriter::printConstant(Constant *CPV) {
665 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
666 switch (CE->getOpcode()) {
667 case Instruction::Trunc:
668 case Instruction::ZExt:
669 case Instruction::SExt:
670 case Instruction::FPTrunc:
671 case Instruction::FPExt:
672 case Instruction::UIToFP:
673 case Instruction::SIToFP:
674 case Instruction::FPToUI:
675 case Instruction::FPToSI:
676 case Instruction::PtrToInt:
677 case Instruction::IntToPtr:
678 case Instruction::BitCast:
680 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
681 if (CE->getOpcode() == Instruction::SExt &&
682 CE->getOperand(0)->getType() == Type::BoolTy) {
683 // Make sure we really sext from bool here by subtracting from 0
686 printConstant(CE->getOperand(0));
687 if (CE->getType() == Type::BoolTy &&
688 (CE->getOpcode() == Instruction::Trunc ||
689 CE->getOpcode() == Instruction::FPToUI ||
690 CE->getOpcode() == Instruction::FPToSI ||
691 CE->getOpcode() == Instruction::PtrToInt)) {
692 // Make sure we really truncate to bool here by anding with 1
698 case Instruction::GetElementPtr:
700 printIndexingExpression(CE->getOperand(0), gep_type_begin(CPV),
704 case Instruction::Select:
706 printConstant(CE->getOperand(0));
708 printConstant(CE->getOperand(1));
710 printConstant(CE->getOperand(2));
713 case Instruction::Add:
714 case Instruction::Sub:
715 case Instruction::Mul:
716 case Instruction::SDiv:
717 case Instruction::UDiv:
718 case Instruction::FDiv:
719 case Instruction::URem:
720 case Instruction::SRem:
721 case Instruction::FRem:
722 case Instruction::And:
723 case Instruction::Or:
724 case Instruction::Xor:
725 case Instruction::ICmp:
726 case Instruction::FCmp:
727 case Instruction::Shl:
728 case Instruction::LShr:
729 case Instruction::AShr:
732 bool NeedsClosingParens = printConstExprCast(CE);
733 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
734 switch (CE->getOpcode()) {
735 case Instruction::Add: Out << " + "; break;
736 case Instruction::Sub: Out << " - "; break;
737 case Instruction::Mul: Out << " * "; break;
738 case Instruction::URem:
739 case Instruction::SRem:
740 case Instruction::FRem: Out << " % "; break;
741 case Instruction::UDiv:
742 case Instruction::SDiv:
743 case Instruction::FDiv: Out << " / "; break;
744 case Instruction::And: Out << " & "; break;
745 case Instruction::Or: Out << " | "; break;
746 case Instruction::Xor: Out << " ^ "; break;
747 case Instruction::Shl: Out << " << "; break;
748 case Instruction::LShr:
749 case Instruction::AShr: Out << " >> "; break;
750 case Instruction::ICmp:
751 switch (CE->getPredicate()) {
752 case ICmpInst::ICMP_EQ: Out << " == "; break;
753 case ICmpInst::ICMP_NE: Out << " != "; break;
754 case ICmpInst::ICMP_SLT:
755 case ICmpInst::ICMP_ULT: Out << " < "; break;
756 case ICmpInst::ICMP_SLE:
757 case ICmpInst::ICMP_ULE: Out << " <= "; break;
758 case ICmpInst::ICMP_SGT:
759 case ICmpInst::ICMP_UGT: Out << " > "; break;
760 case ICmpInst::ICMP_SGE:
761 case ICmpInst::ICMP_UGE: Out << " >= "; break;
762 default: assert(0 && "Illegal ICmp predicate");
765 case Instruction::FCmp:
766 switch (CE->getPredicate()) {
767 case FCmpInst::FCMP_ORD:
768 case FCmpInst::FCMP_UEQ:
769 case FCmpInst::FCMP_OEQ: Out << " == "; break;
770 case FCmpInst::FCMP_UNO:
771 case FCmpInst::FCMP_UNE:
772 case FCmpInst::FCMP_ONE: Out << " != "; break;
773 case FCmpInst::FCMP_OLT:
774 case FCmpInst::FCMP_ULT: Out << " < "; break;
775 case FCmpInst::FCMP_OLE:
776 case FCmpInst::FCMP_ULE: Out << " <= "; break;
777 case FCmpInst::FCMP_OGT:
778 case FCmpInst::FCMP_UGT: Out << " > "; break;
779 case FCmpInst::FCMP_OGE:
780 case FCmpInst::FCMP_UGE: Out << " >= "; break;
781 default: assert(0 && "Illegal FCmp predicate");
784 default: assert(0 && "Illegal opcode here!");
786 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
787 if (NeedsClosingParens)
794 cerr << "CWriter Error: Unhandled constant expression: "
798 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
800 printType(Out, CPV->getType()); // sign doesn't matter
801 Out << ")/*UNDEF*/0)";
805 switch (CPV->getType()->getTypeID()) {
807 Out << (cast<ConstantBool>(CPV)->getValue() ? '1' : '0');
810 Out << "((char)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
812 case Type::Int16TyID:
813 Out << "((short)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
815 case Type::Int32TyID:
816 Out << "((int)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
818 case Type::Int64TyID:
819 Out << "((long long)" << cast<ConstantInt>(CPV)->getSExtValue() << "ll)";
822 case Type::FloatTyID:
823 case Type::DoubleTyID: {
824 ConstantFP *FPC = cast<ConstantFP>(CPV);
825 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
826 if (I != FPConstantMap.end()) {
827 // Because of FP precision problems we must load from a stack allocated
828 // value that holds the value in hex.
829 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
830 << "*)&FPConstant" << I->second << ')';
832 if (IsNAN(FPC->getValue())) {
835 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
837 const unsigned long QuietNaN = 0x7ff8UL;
838 //const unsigned long SignalNaN = 0x7ff4UL;
840 // We need to grab the first part of the FP #
843 uint64_t ll = DoubleToBits(FPC->getValue());
844 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
846 std::string Num(&Buffer[0], &Buffer[6]);
847 unsigned long Val = strtoul(Num.c_str(), 0, 16);
849 if (FPC->getType() == Type::FloatTy)
850 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
851 << Buffer << "\") /*nan*/ ";
853 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
854 << Buffer << "\") /*nan*/ ";
855 } else if (IsInf(FPC->getValue())) {
857 if (FPC->getValue() < 0) Out << '-';
858 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
862 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
863 // Print out the constant as a floating point number.
865 sprintf(Buffer, "%a", FPC->getValue());
868 Num = ftostr(FPC->getValue());
876 case Type::ArrayTyID:
877 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
878 const ArrayType *AT = cast<ArrayType>(CPV->getType());
880 if (AT->getNumElements()) {
882 Constant *CZ = Constant::getNullValue(AT->getElementType());
884 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
891 printConstantArray(cast<ConstantArray>(CPV));
895 case Type::PackedTyID:
896 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
897 const PackedType *AT = cast<PackedType>(CPV->getType());
899 if (AT->getNumElements()) {
901 Constant *CZ = Constant::getNullValue(AT->getElementType());
903 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
910 printConstantPacked(cast<ConstantPacked>(CPV));
914 case Type::StructTyID:
915 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
916 const StructType *ST = cast<StructType>(CPV->getType());
918 if (ST->getNumElements()) {
920 printConstant(Constant::getNullValue(ST->getElementType(0)));
921 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
923 printConstant(Constant::getNullValue(ST->getElementType(i)));
929 if (CPV->getNumOperands()) {
931 printConstant(cast<Constant>(CPV->getOperand(0)));
932 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
934 printConstant(cast<Constant>(CPV->getOperand(i)));
941 case Type::PointerTyID:
942 if (isa<ConstantPointerNull>(CPV)) {
944 printType(Out, CPV->getType()); // sign doesn't matter
945 Out << ")/*NULL*/0)";
947 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
953 cerr << "Unknown constant type: " << *CPV << "\n";
958 // Some constant expressions need to be casted back to the original types
959 // because their operands were casted to the expected type. This function takes
960 // care of detecting that case and printing the cast for the ConstantExpr.
961 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
962 bool NeedsExplicitCast = false;
963 const Type *Ty = CE->getOperand(0)->getType();
964 bool TypeIsSigned = false;
965 switch (CE->getOpcode()) {
966 case Instruction::LShr:
967 case Instruction::URem:
968 case Instruction::UDiv: NeedsExplicitCast = true; break;
969 case Instruction::AShr:
970 case Instruction::SRem:
971 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
972 case Instruction::SExt:
974 NeedsExplicitCast = true;
977 case Instruction::ZExt:
978 case Instruction::Trunc:
979 case Instruction::FPTrunc:
980 case Instruction::FPExt:
981 case Instruction::UIToFP:
982 case Instruction::SIToFP:
983 case Instruction::FPToUI:
984 case Instruction::FPToSI:
985 case Instruction::PtrToInt:
986 case Instruction::IntToPtr:
987 case Instruction::BitCast:
989 NeedsExplicitCast = true;
993 if (NeedsExplicitCast) {
995 if (Ty->isPrimitiveType())
996 printPrimitiveType(Out, Ty, TypeIsSigned);
1001 return NeedsExplicitCast;
1004 // Print a constant assuming that it is the operand for a given Opcode. The
1005 // opcodes that care about sign need to cast their operands to the expected
1006 // type before the operation proceeds. This function does the casting.
1007 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1009 // Extract the operand's type, we'll need it.
1010 const Type* OpTy = CPV->getType();
1012 // Indicate whether to do the cast or not.
1013 bool shouldCast = false;
1014 bool typeIsSigned = false;
1016 // Based on the Opcode for which this Constant is being written, determine
1017 // the new type to which the operand should be casted by setting the value
1018 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1022 // for most instructions, it doesn't matter
1024 case Instruction::LShr:
1025 case Instruction::UDiv:
1026 case Instruction::URem:
1029 case Instruction::AShr:
1030 case Instruction::SDiv:
1031 case Instruction::SRem:
1033 typeIsSigned = true;
1037 // Write out the casted constant if we should, otherwise just write the
1041 printPrimitiveType(Out, OpTy, typeIsSigned);
1049 void CWriter::writeOperandInternal(Value *Operand) {
1050 if (Instruction *I = dyn_cast<Instruction>(Operand))
1051 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1052 // Should we inline this instruction to build a tree?
1059 Constant* CPV = dyn_cast<Constant>(Operand);
1060 if (CPV && !isa<GlobalValue>(CPV)) {
1063 Out << Mang->getValueName(Operand);
1067 void CWriter::writeOperandRaw(Value *Operand) {
1068 Constant* CPV = dyn_cast<Constant>(Operand);
1069 if (CPV && !isa<GlobalValue>(CPV)) {
1072 Out << Mang->getValueName(Operand);
1076 void CWriter::writeOperand(Value *Operand) {
1077 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1078 Out << "(&"; // Global variables are referenced as their addresses by llvm
1080 writeOperandInternal(Operand);
1082 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1086 // Some instructions need to have their result value casted back to the
1087 // original types because their operands were casted to the expected type.
1088 // This function takes care of detecting that case and printing the cast
1089 // for the Instruction.
1090 bool CWriter::writeInstructionCast(const Instruction &I) {
1091 const Type *Ty = I.getOperand(0)->getType();
1092 switch (I.getOpcode()) {
1093 case Instruction::LShr:
1094 case Instruction::URem:
1095 case Instruction::UDiv:
1097 printPrimitiveType(Out, Ty, false);
1100 case Instruction::AShr:
1101 case Instruction::SRem:
1102 case Instruction::SDiv:
1104 printPrimitiveType(Out, Ty, true);
1112 // Write the operand with a cast to another type based on the Opcode being used.
1113 // This will be used in cases where an instruction has specific type
1114 // requirements (usually signedness) for its operands.
1115 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1117 // Extract the operand's type, we'll need it.
1118 const Type* OpTy = Operand->getType();
1120 // Indicate whether to do the cast or not.
1121 bool shouldCast = false;
1123 // Indicate whether the cast should be to a signed type or not.
1124 bool castIsSigned = false;
1126 // Based on the Opcode for which this Operand is being written, determine
1127 // the new type to which the operand should be casted by setting the value
1128 // of OpTy. If we change OpTy, also set shouldCast to true.
1131 // for most instructions, it doesn't matter
1133 case Instruction::LShr:
1134 case Instruction::UDiv:
1135 case Instruction::URem: // Cast to unsigned first
1137 castIsSigned = false;
1139 case Instruction::AShr:
1140 case Instruction::SDiv:
1141 case Instruction::SRem: // Cast to signed first
1143 castIsSigned = true;
1147 // Write out the casted operand if we should, otherwise just write the
1151 printPrimitiveType(Out, OpTy, castIsSigned);
1153 writeOperand(Operand);
1156 writeOperand(Operand);
1159 // Write the operand with a cast to another type based on the icmp predicate
1161 void CWriter::writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate) {
1163 // Extract the operand's type, we'll need it.
1164 const Type* OpTy = Operand->getType();
1166 // Indicate whether to do the cast or not.
1167 bool shouldCast = false;
1169 // Indicate whether the cast should be to a signed type or not.
1170 bool castIsSigned = false;
1172 // Based on the Opcode for which this Operand is being written, determine
1173 // the new type to which the operand should be casted by setting the value
1174 // of OpTy. If we change OpTy, also set shouldCast to true.
1175 switch (predicate) {
1177 // for eq and ne, it doesn't matter
1179 case ICmpInst::ICMP_UGT:
1180 case ICmpInst::ICMP_UGE:
1181 case ICmpInst::ICMP_ULT:
1182 case ICmpInst::ICMP_ULE:
1185 case ICmpInst::ICMP_SGT:
1186 case ICmpInst::ICMP_SGE:
1187 case ICmpInst::ICMP_SLT:
1188 case ICmpInst::ICMP_SLE:
1190 castIsSigned = true;
1194 // Write out the casted operand if we should, otherwise just write the
1198 if (OpTy->isPrimitiveType())
1199 printPrimitiveType(Out, OpTy, castIsSigned);
1201 printType(Out, OpTy);
1203 writeOperand(Operand);
1206 writeOperand(Operand);
1209 // generateCompilerSpecificCode - This is where we add conditional compilation
1210 // directives to cater to specific compilers as need be.
1212 static void generateCompilerSpecificCode(std::ostream& Out) {
1213 // Alloca is hard to get, and we don't want to include stdlib.h here.
1214 Out << "/* get a declaration for alloca */\n"
1215 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1216 << "extern void *_alloca(unsigned long);\n"
1217 << "#define alloca(x) _alloca(x)\n"
1218 << "#elif defined(__APPLE__)\n"
1219 << "extern void *__builtin_alloca(unsigned long);\n"
1220 << "#define alloca(x) __builtin_alloca(x)\n"
1221 << "#define longjmp _longjmp\n"
1222 << "#define setjmp _setjmp\n"
1223 << "#elif defined(__sun__)\n"
1224 << "#if defined(__sparcv9)\n"
1225 << "extern void *__builtin_alloca(unsigned long);\n"
1227 << "extern void *__builtin_alloca(unsigned int);\n"
1229 << "#define alloca(x) __builtin_alloca(x)\n"
1230 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1231 << "#define alloca(x) __builtin_alloca(x)\n"
1232 << "#elif !defined(_MSC_VER)\n"
1233 << "#include <alloca.h>\n"
1236 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1237 // If we aren't being compiled with GCC, just drop these attributes.
1238 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1239 << "#define __attribute__(X)\n"
1242 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1243 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1244 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1245 << "#elif defined(__GNUC__)\n"
1246 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1248 << "#define __EXTERNAL_WEAK__\n"
1251 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1252 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1253 << "#define __ATTRIBUTE_WEAK__\n"
1254 << "#elif defined(__GNUC__)\n"
1255 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1257 << "#define __ATTRIBUTE_WEAK__\n"
1260 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1261 // From the GCC documentation:
1263 // double __builtin_nan (const char *str)
1265 // This is an implementation of the ISO C99 function nan.
1267 // Since ISO C99 defines this function in terms of strtod, which we do
1268 // not implement, a description of the parsing is in order. The string is
1269 // parsed as by strtol; that is, the base is recognized by leading 0 or
1270 // 0x prefixes. The number parsed is placed in the significand such that
1271 // the least significant bit of the number is at the least significant
1272 // bit of the significand. The number is truncated to fit the significand
1273 // field provided. The significand is forced to be a quiet NaN.
1275 // This function, if given a string literal, is evaluated early enough
1276 // that it is considered a compile-time constant.
1278 // float __builtin_nanf (const char *str)
1280 // Similar to __builtin_nan, except the return type is float.
1282 // double __builtin_inf (void)
1284 // Similar to __builtin_huge_val, except a warning is generated if the
1285 // target floating-point format does not support infinities. This
1286 // function is suitable for implementing the ISO C99 macro INFINITY.
1288 // float __builtin_inff (void)
1290 // Similar to __builtin_inf, except the return type is float.
1291 Out << "#ifdef __GNUC__\n"
1292 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1293 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1294 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1295 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1296 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1297 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1298 << "#define LLVM_PREFETCH(addr,rw,locality) "
1299 "__builtin_prefetch(addr,rw,locality)\n"
1300 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1301 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1302 << "#define LLVM_ASM __asm__\n"
1304 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1305 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1306 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1307 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1308 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1309 << "#define LLVM_INFF 0.0F /* Float */\n"
1310 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1311 << "#define __ATTRIBUTE_CTOR__\n"
1312 << "#define __ATTRIBUTE_DTOR__\n"
1313 << "#define LLVM_ASM(X)\n"
1316 // Output target-specific code that should be inserted into main.
1317 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1318 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1319 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1320 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1321 << "defined(__x86_64__)\n"
1322 << "#undef CODE_FOR_MAIN\n"
1323 << "#define CODE_FOR_MAIN() \\\n"
1324 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1325 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1326 << "#endif\n#endif\n";
1330 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1331 /// the StaticTors set.
1332 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1333 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1334 if (!InitList) return;
1336 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1337 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1338 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1340 if (CS->getOperand(1)->isNullValue())
1341 return; // Found a null terminator, exit printing.
1342 Constant *FP = CS->getOperand(1);
1343 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1345 FP = CE->getOperand(0);
1346 if (Function *F = dyn_cast<Function>(FP))
1347 StaticTors.insert(F);
1351 enum SpecialGlobalClass {
1353 GlobalCtors, GlobalDtors,
1357 /// getGlobalVariableClass - If this is a global that is specially recognized
1358 /// by LLVM, return a code that indicates how we should handle it.
1359 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1360 // If this is a global ctors/dtors list, handle it now.
1361 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1362 if (GV->getName() == "llvm.global_ctors")
1364 else if (GV->getName() == "llvm.global_dtors")
1368 // Otherwise, it it is other metadata, don't print it. This catches things
1369 // like debug information.
1370 if (GV->getSection() == "llvm.metadata")
1377 bool CWriter::doInitialization(Module &M) {
1381 IL.AddPrototypes(M);
1383 // Ensure that all structure types have names...
1384 Mang = new Mangler(M);
1385 Mang->markCharUnacceptable('.');
1387 // Keep track of which functions are static ctors/dtors so they can have
1388 // an attribute added to their prototypes.
1389 std::set<Function*> StaticCtors, StaticDtors;
1390 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1392 switch (getGlobalVariableClass(I)) {
1395 FindStaticTors(I, StaticCtors);
1398 FindStaticTors(I, StaticDtors);
1403 // get declaration for alloca
1404 Out << "/* Provide Declarations */\n";
1405 Out << "#include <stdarg.h>\n"; // Varargs support
1406 Out << "#include <setjmp.h>\n"; // Unwind support
1407 generateCompilerSpecificCode(Out);
1409 // Provide a definition for `bool' if not compiling with a C++ compiler.
1411 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1413 << "\n\n/* Support for floating point constants */\n"
1414 << "typedef unsigned long long ConstantDoubleTy;\n"
1415 << "typedef unsigned int ConstantFloatTy;\n"
1417 << "\n\n/* Global Declarations */\n";
1419 // First output all the declarations for the program, because C requires
1420 // Functions & globals to be declared before they are used.
1423 // Loop over the symbol table, emitting all named constants...
1424 printModuleTypes(M.getSymbolTable());
1426 // Global variable declarations...
1427 if (!M.global_empty()) {
1428 Out << "\n/* External Global Variable Declarations */\n";
1429 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1431 if (I->hasExternalLinkage()) {
1433 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1435 } else if (I->hasDLLImportLinkage()) {
1436 Out << "__declspec(dllimport) ";
1437 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1439 } else if (I->hasExternalWeakLinkage()) {
1441 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1442 Out << " __EXTERNAL_WEAK__ ;\n";
1447 // Function declarations
1448 Out << "\n/* Function Declarations */\n";
1449 Out << "double fmod(double, double);\n"; // Support for FP rem
1450 Out << "float fmodf(float, float);\n";
1452 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1453 // Don't print declarations for intrinsic functions.
1454 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1455 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1456 if (I->hasExternalWeakLinkage())
1458 printFunctionSignature(I, true);
1459 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1460 Out << " __ATTRIBUTE_WEAK__";
1461 if (I->hasExternalWeakLinkage())
1462 Out << " __EXTERNAL_WEAK__";
1463 if (StaticCtors.count(I))
1464 Out << " __ATTRIBUTE_CTOR__";
1465 if (StaticDtors.count(I))
1466 Out << " __ATTRIBUTE_DTOR__";
1468 if (I->hasName() && I->getName()[0] == 1)
1469 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1475 // Output the global variable declarations
1476 if (!M.global_empty()) {
1477 Out << "\n\n/* Global Variable Declarations */\n";
1478 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1480 if (!I->isExternal()) {
1481 // Ignore special globals, such as debug info.
1482 if (getGlobalVariableClass(I))
1485 if (I->hasInternalLinkage())
1489 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1491 if (I->hasLinkOnceLinkage())
1492 Out << " __attribute__((common))";
1493 else if (I->hasWeakLinkage())
1494 Out << " __ATTRIBUTE_WEAK__";
1495 else if (I->hasExternalWeakLinkage())
1496 Out << " __EXTERNAL_WEAK__";
1501 // Output the global variable definitions and contents...
1502 if (!M.global_empty()) {
1503 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1504 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1506 if (!I->isExternal()) {
1507 // Ignore special globals, such as debug info.
1508 if (getGlobalVariableClass(I))
1511 if (I->hasInternalLinkage())
1513 else if (I->hasDLLImportLinkage())
1514 Out << "__declspec(dllimport) ";
1515 else if (I->hasDLLExportLinkage())
1516 Out << "__declspec(dllexport) ";
1518 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1519 if (I->hasLinkOnceLinkage())
1520 Out << " __attribute__((common))";
1521 else if (I->hasWeakLinkage())
1522 Out << " __ATTRIBUTE_WEAK__";
1524 // If the initializer is not null, emit the initializer. If it is null,
1525 // we try to avoid emitting large amounts of zeros. The problem with
1526 // this, however, occurs when the variable has weak linkage. In this
1527 // case, the assembler will complain about the variable being both weak
1528 // and common, so we disable this optimization.
1529 if (!I->getInitializer()->isNullValue()) {
1531 writeOperand(I->getInitializer());
1532 } else if (I->hasWeakLinkage()) {
1533 // We have to specify an initializer, but it doesn't have to be
1534 // complete. If the value is an aggregate, print out { 0 }, and let
1535 // the compiler figure out the rest of the zeros.
1537 if (isa<StructType>(I->getInitializer()->getType()) ||
1538 isa<ArrayType>(I->getInitializer()->getType()) ||
1539 isa<PackedType>(I->getInitializer()->getType())) {
1542 // Just print it out normally.
1543 writeOperand(I->getInitializer());
1551 Out << "\n\n/* Function Bodies */\n";
1556 /// Output all floating point constants that cannot be printed accurately...
1557 void CWriter::printFloatingPointConstants(Function &F) {
1558 // Scan the module for floating point constants. If any FP constant is used
1559 // in the function, we want to redirect it here so that we do not depend on
1560 // the precision of the printed form, unless the printed form preserves
1563 static unsigned FPCounter = 0;
1564 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1566 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1567 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1568 !FPConstantMap.count(FPC)) {
1569 double Val = FPC->getValue();
1571 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1573 if (FPC->getType() == Type::DoubleTy) {
1574 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1575 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1576 << "ULL; /* " << Val << " */\n";
1577 } else if (FPC->getType() == Type::FloatTy) {
1578 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1579 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1580 << "U; /* " << Val << " */\n";
1582 assert(0 && "Unknown float type!");
1589 /// printSymbolTable - Run through symbol table looking for type names. If a
1590 /// type name is found, emit its declaration...
1592 void CWriter::printModuleTypes(const SymbolTable &ST) {
1593 Out << "/* Helper union for bitcasts */\n";
1594 Out << "typedef union {\n";
1595 Out << " unsigned int Int32;\n";
1596 Out << " unsigned long long Int64;\n";
1597 Out << " float Float;\n";
1598 Out << " double Double;\n";
1599 Out << "} llvmBitCastUnion;\n";
1601 // We are only interested in the type plane of the symbol table.
1602 SymbolTable::type_const_iterator I = ST.type_begin();
1603 SymbolTable::type_const_iterator End = ST.type_end();
1605 // If there are no type names, exit early.
1606 if (I == End) return;
1608 // Print out forward declarations for structure types before anything else!
1609 Out << "/* Structure forward decls */\n";
1610 for (; I != End; ++I)
1611 if (const Type *STy = dyn_cast<StructType>(I->second)) {
1612 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1613 Out << Name << ";\n";
1614 TypeNames.insert(std::make_pair(STy, Name));
1619 // Now we can print out typedefs...
1620 Out << "/* Typedefs */\n";
1621 for (I = ST.type_begin(); I != End; ++I) {
1622 const Type *Ty = cast<Type>(I->second);
1623 std::string Name = "l_" + Mang->makeNameProper(I->first);
1625 printType(Out, Ty, Name);
1631 // Keep track of which structures have been printed so far...
1632 std::set<const StructType *> StructPrinted;
1634 // Loop over all structures then push them into the stack so they are
1635 // printed in the correct order.
1637 Out << "/* Structure contents */\n";
1638 for (I = ST.type_begin(); I != End; ++I)
1639 if (const StructType *STy = dyn_cast<StructType>(I->second))
1640 // Only print out used types!
1641 printContainedStructs(STy, StructPrinted);
1644 // Push the struct onto the stack and recursively push all structs
1645 // this one depends on.
1647 // TODO: Make this work properly with packed types
1649 void CWriter::printContainedStructs(const Type *Ty,
1650 std::set<const StructType*> &StructPrinted){
1651 // Don't walk through pointers.
1652 if (isa<PointerType>(Ty) || Ty->isPrimitiveType()) return;
1654 // Print all contained types first.
1655 for (Type::subtype_iterator I = Ty->subtype_begin(),
1656 E = Ty->subtype_end(); I != E; ++I)
1657 printContainedStructs(*I, StructPrinted);
1659 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1660 // Check to see if we have already printed this struct.
1661 if (StructPrinted.insert(STy).second) {
1662 // Print structure type out.
1663 std::string Name = TypeNames[STy];
1664 printType(Out, STy, Name, true);
1670 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1671 /// isCStructReturn - Should this function actually return a struct by-value?
1672 bool isCStructReturn = F->getCallingConv() == CallingConv::CSRet;
1674 if (F->hasInternalLinkage()) Out << "static ";
1675 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1676 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1677 switch (F->getCallingConv()) {
1678 case CallingConv::X86_StdCall:
1679 Out << "__stdcall ";
1681 case CallingConv::X86_FastCall:
1682 Out << "__fastcall ";
1686 // Loop over the arguments, printing them...
1687 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1689 std::stringstream FunctionInnards;
1691 // Print out the name...
1692 FunctionInnards << Mang->getValueName(F) << '(';
1694 bool PrintedArg = false;
1695 if (!F->isExternal()) {
1696 if (!F->arg_empty()) {
1697 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1699 // If this is a struct-return function, don't print the hidden
1700 // struct-return argument.
1701 if (isCStructReturn) {
1702 assert(I != E && "Invalid struct return function!");
1706 std::string ArgName;
1707 for (; I != E; ++I) {
1708 if (PrintedArg) FunctionInnards << ", ";
1709 if (I->hasName() || !Prototype)
1710 ArgName = Mang->getValueName(I);
1713 printType(FunctionInnards, I->getType(), ArgName);
1718 // Loop over the arguments, printing them.
1719 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1721 // If this is a struct-return function, don't print the hidden
1722 // struct-return argument.
1723 if (isCStructReturn) {
1724 assert(I != E && "Invalid struct return function!");
1728 for (; I != E; ++I) {
1729 if (PrintedArg) FunctionInnards << ", ";
1730 printType(FunctionInnards, *I);
1735 // Finish printing arguments... if this is a vararg function, print the ...,
1736 // unless there are no known types, in which case, we just emit ().
1738 if (FT->isVarArg() && PrintedArg) {
1739 if (PrintedArg) FunctionInnards << ", ";
1740 FunctionInnards << "..."; // Output varargs portion of signature!
1741 } else if (!FT->isVarArg() && !PrintedArg) {
1742 FunctionInnards << "void"; // ret() -> ret(void) in C.
1744 FunctionInnards << ')';
1746 // Get the return tpe for the function.
1748 if (!isCStructReturn)
1749 RetTy = F->getReturnType();
1751 // If this is a struct-return function, print the struct-return type.
1752 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1755 // Print out the return type and the signature built above.
1756 printType(Out, RetTy, FunctionInnards.str());
1759 static inline bool isFPIntBitCast(const Instruction &I) {
1760 if (!isa<BitCastInst>(I))
1762 const Type *SrcTy = I.getOperand(0)->getType();
1763 const Type *DstTy = I.getType();
1764 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1765 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1768 void CWriter::printFunction(Function &F) {
1769 printFunctionSignature(&F, false);
1772 // If this is a struct return function, handle the result with magic.
1773 if (F.getCallingConv() == CallingConv::CSRet) {
1774 const Type *StructTy =
1775 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1777 printType(Out, StructTy, "StructReturn");
1778 Out << "; /* Struct return temporary */\n";
1781 printType(Out, F.arg_begin()->getType(), Mang->getValueName(F.arg_begin()));
1782 Out << " = &StructReturn;\n";
1785 bool PrintedVar = false;
1787 // print local variable information for the function
1788 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1789 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1791 printType(Out, AI->getAllocatedType(), Mang->getValueName(AI));
1792 Out << "; /* Address-exposed local */\n";
1794 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1796 printType(Out, I->getType(), Mang->getValueName(&*I));
1799 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1801 printType(Out, I->getType(),
1802 Mang->getValueName(&*I)+"__PHI_TEMPORARY");
1807 // We need a temporary for the BitCast to use so it can pluck a value out
1808 // of a union to do the BitCast. This is separate from the need for a
1809 // variable to hold the result of the BitCast.
1810 if (isFPIntBitCast(*I)) {
1811 Out << " llvmBitCastUnion " << Mang->getValueName(&*I)
1812 << "__BITCAST_TEMPORARY;\n";
1820 if (F.hasExternalLinkage() && F.getName() == "main")
1821 Out << " CODE_FOR_MAIN();\n";
1823 // print the basic blocks
1824 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1825 if (Loop *L = LI->getLoopFor(BB)) {
1826 if (L->getHeader() == BB && L->getParentLoop() == 0)
1829 printBasicBlock(BB);
1836 void CWriter::printLoop(Loop *L) {
1837 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1838 << "' to make GCC happy */\n";
1839 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1840 BasicBlock *BB = L->getBlocks()[i];
1841 Loop *BBLoop = LI->getLoopFor(BB);
1843 printBasicBlock(BB);
1844 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
1847 Out << " } while (1); /* end of syntactic loop '"
1848 << L->getHeader()->getName() << "' */\n";
1851 void CWriter::printBasicBlock(BasicBlock *BB) {
1853 // Don't print the label for the basic block if there are no uses, or if
1854 // the only terminator use is the predecessor basic block's terminator.
1855 // We have to scan the use list because PHI nodes use basic blocks too but
1856 // do not require a label to be generated.
1858 bool NeedsLabel = false;
1859 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
1860 if (isGotoCodeNecessary(*PI, BB)) {
1865 if (NeedsLabel) Out << Mang->getValueName(BB) << ":\n";
1867 // Output all of the instructions in the basic block...
1868 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
1870 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
1871 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
1880 // Don't emit prefix or suffix for the terminator...
1881 visit(*BB->getTerminator());
1885 // Specific Instruction type classes... note that all of the casts are
1886 // necessary because we use the instruction classes as opaque types...
1888 void CWriter::visitReturnInst(ReturnInst &I) {
1889 // If this is a struct return function, return the temporary struct.
1890 if (I.getParent()->getParent()->getCallingConv() == CallingConv::CSRet) {
1891 Out << " return StructReturn;\n";
1895 // Don't output a void return if this is the last basic block in the function
1896 if (I.getNumOperands() == 0 &&
1897 &*--I.getParent()->getParent()->end() == I.getParent() &&
1898 !I.getParent()->size() == 1) {
1903 if (I.getNumOperands()) {
1905 writeOperand(I.getOperand(0));
1910 void CWriter::visitSwitchInst(SwitchInst &SI) {
1913 writeOperand(SI.getOperand(0));
1914 Out << ") {\n default:\n";
1915 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
1916 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
1918 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
1920 writeOperand(SI.getOperand(i));
1922 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
1923 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
1924 printBranchToBlock(SI.getParent(), Succ, 2);
1925 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
1931 void CWriter::visitUnreachableInst(UnreachableInst &I) {
1932 Out << " /*UNREACHABLE*/;\n";
1935 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
1936 /// FIXME: This should be reenabled, but loop reordering safe!!
1939 if (next(Function::iterator(From)) != Function::iterator(To))
1940 return true; // Not the direct successor, we need a goto.
1942 //isa<SwitchInst>(From->getTerminator())
1944 if (LI->getLoopFor(From) != LI->getLoopFor(To))
1949 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
1950 BasicBlock *Successor,
1952 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
1953 PHINode *PN = cast<PHINode>(I);
1954 // Now we have to do the printing.
1955 Value *IV = PN->getIncomingValueForBlock(CurBlock);
1956 if (!isa<UndefValue>(IV)) {
1957 Out << std::string(Indent, ' ');
1958 Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = ";
1960 Out << "; /* for PHI node */\n";
1965 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
1967 if (isGotoCodeNecessary(CurBB, Succ)) {
1968 Out << std::string(Indent, ' ') << " goto ";
1974 // Branch instruction printing - Avoid printing out a branch to a basic block
1975 // that immediately succeeds the current one.
1977 void CWriter::visitBranchInst(BranchInst &I) {
1979 if (I.isConditional()) {
1980 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
1982 writeOperand(I.getCondition());
1985 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
1986 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
1988 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
1989 Out << " } else {\n";
1990 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
1991 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
1994 // First goto not necessary, assume second one is...
1996 writeOperand(I.getCondition());
1999 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2000 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2005 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2006 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2011 // PHI nodes get copied into temporary values at the end of predecessor basic
2012 // blocks. We now need to copy these temporary values into the REAL value for
2014 void CWriter::visitPHINode(PHINode &I) {
2016 Out << "__PHI_TEMPORARY";
2020 void CWriter::visitBinaryOperator(Instruction &I) {
2021 // binary instructions, shift instructions, setCond instructions.
2022 assert(!isa<PointerType>(I.getType()));
2024 // We must cast the results of binary operations which might be promoted.
2025 bool needsCast = false;
2026 if ((I.getType() == Type::Int8Ty) || (I.getType() == Type::Int16Ty)
2027 || (I.getType() == Type::FloatTy)) {
2030 printType(Out, I.getType());
2034 // If this is a negation operation, print it out as such. For FP, we don't
2035 // want to print "-0.0 - X".
2036 if (BinaryOperator::isNeg(&I)) {
2038 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2040 } else if (I.getOpcode() == Instruction::FRem) {
2041 // Output a call to fmod/fmodf instead of emitting a%b
2042 if (I.getType() == Type::FloatTy)
2046 writeOperand(I.getOperand(0));
2048 writeOperand(I.getOperand(1));
2052 // Write out the cast of the instruction's value back to the proper type
2054 bool NeedsClosingParens = writeInstructionCast(I);
2056 // Certain instructions require the operand to be forced to a specific type
2057 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2058 // below for operand 1
2059 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2061 switch (I.getOpcode()) {
2062 case Instruction::Add: Out << " + "; break;
2063 case Instruction::Sub: Out << " - "; break;
2064 case Instruction::Mul: Out << '*'; break;
2065 case Instruction::URem:
2066 case Instruction::SRem:
2067 case Instruction::FRem: Out << '%'; break;
2068 case Instruction::UDiv:
2069 case Instruction::SDiv:
2070 case Instruction::FDiv: Out << '/'; break;
2071 case Instruction::And: Out << " & "; break;
2072 case Instruction::Or: Out << " | "; break;
2073 case Instruction::Xor: Out << " ^ "; break;
2074 case Instruction::Shl : Out << " << "; break;
2075 case Instruction::LShr:
2076 case Instruction::AShr: Out << " >> "; break;
2077 default: cerr << "Invalid operator type!" << I; abort();
2080 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2081 if (NeedsClosingParens)
2090 void CWriter::visitICmpInst(ICmpInst &I) {
2091 // We must cast the results of icmp which might be promoted.
2092 bool needsCast = false;
2094 // Write out the cast of the instruction's value back to the proper type
2096 bool NeedsClosingParens = writeInstructionCast(I);
2098 // Certain icmp predicate require the operand to be forced to a specific type
2099 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2100 // below for operand 1
2101 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2103 switch (I.getPredicate()) {
2104 case ICmpInst::ICMP_EQ: Out << " == "; break;
2105 case ICmpInst::ICMP_NE: Out << " != "; break;
2106 case ICmpInst::ICMP_ULE:
2107 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2108 case ICmpInst::ICMP_UGE:
2109 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2110 case ICmpInst::ICMP_ULT:
2111 case ICmpInst::ICMP_SLT: Out << " < "; break;
2112 case ICmpInst::ICMP_UGT:
2113 case ICmpInst::ICMP_SGT: Out << " > "; break;
2114 default: cerr << "Invalid icmp predicate!" << I; abort();
2117 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2118 if (NeedsClosingParens)
2126 void CWriter::visitFCmpInst(FCmpInst &I) {
2127 // Write the first operand
2128 writeOperand(I.getOperand(0));
2130 // Write the predicate
2131 switch (I.getPredicate()) {
2132 case FCmpInst::FCMP_FALSE: Out << " 0 "; break;
2133 case FCmpInst::FCMP_ORD:
2134 case FCmpInst::FCMP_OEQ:
2135 case FCmpInst::FCMP_UEQ: Out << " == "; break;
2136 case FCmpInst::FCMP_UNO:
2137 case FCmpInst::FCMP_ONE:
2138 case FCmpInst::FCMP_UNE: Out << " != "; break;
2139 case FCmpInst::FCMP_ULE:
2140 case FCmpInst::FCMP_OLE: Out << " <= "; break;
2141 case FCmpInst::FCMP_UGE:
2142 case FCmpInst::FCMP_OGE: Out << " >= "; break;
2143 case FCmpInst::FCMP_ULT:
2144 case FCmpInst::FCMP_OLT: Out << " < "; break;
2145 case FCmpInst::FCMP_UGT:
2146 case FCmpInst::FCMP_OGT: Out << " > "; break;
2147 case FCmpInst::FCMP_TRUE: Out << " 1 "; break;
2148 default: cerr << "Invalid fcmp predicate!" << I; abort();
2150 // Write the second operand
2151 writeOperand(I.getOperand(1));
2154 static const char * getFloatBitCastField(const Type *Ty) {
2155 switch (Ty->getTypeID()) {
2156 default: assert(0 && "Invalid Type");
2157 case Type::FloatTyID: return "Float";
2158 case Type::Int32TyID: return "Int32";
2159 case Type::DoubleTyID: return "Double";
2160 case Type::Int64TyID: return "Int64";
2164 void CWriter::visitCastInst(CastInst &I) {
2165 const Type *DstTy = I.getType();
2166 const Type *SrcTy = I.getOperand(0)->getType();
2168 if (isFPIntBitCast(I)) {
2169 // These int<->float and long<->double casts need to be handled specially
2170 Out << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2171 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2172 writeOperand(I.getOperand(0));
2173 Out << ", " << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2174 << getFloatBitCastField(I.getType());
2176 printCast(I.getOpcode(), SrcTy, DstTy);
2177 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::BoolTy) {
2178 // Make sure we really get a sext from bool by subtracing the bool from 0
2181 writeOperand(I.getOperand(0));
2182 if (DstTy == Type::BoolTy &&
2183 (I.getOpcode() == Instruction::Trunc ||
2184 I.getOpcode() == Instruction::FPToUI ||
2185 I.getOpcode() == Instruction::FPToSI ||
2186 I.getOpcode() == Instruction::PtrToInt)) {
2187 // Make sure we really get a trunc to bool by anding the operand with 1
2194 void CWriter::visitSelectInst(SelectInst &I) {
2196 writeOperand(I.getCondition());
2198 writeOperand(I.getTrueValue());
2200 writeOperand(I.getFalseValue());
2205 void CWriter::lowerIntrinsics(Function &F) {
2206 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2207 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2208 if (CallInst *CI = dyn_cast<CallInst>(I++))
2209 if (Function *F = CI->getCalledFunction())
2210 switch (F->getIntrinsicID()) {
2211 case Intrinsic::not_intrinsic:
2212 case Intrinsic::vastart:
2213 case Intrinsic::vacopy:
2214 case Intrinsic::vaend:
2215 case Intrinsic::returnaddress:
2216 case Intrinsic::frameaddress:
2217 case Intrinsic::setjmp:
2218 case Intrinsic::longjmp:
2219 case Intrinsic::prefetch:
2220 case Intrinsic::dbg_stoppoint:
2221 case Intrinsic::powi_f32:
2222 case Intrinsic::powi_f64:
2223 // We directly implement these intrinsics
2226 // If this is an intrinsic that directly corresponds to a GCC
2227 // builtin, we handle it.
2228 const char *BuiltinName = "";
2229 #define GET_GCC_BUILTIN_NAME
2230 #include "llvm/Intrinsics.gen"
2231 #undef GET_GCC_BUILTIN_NAME
2232 // If we handle it, don't lower it.
2233 if (BuiltinName[0]) break;
2235 // All other intrinsic calls we must lower.
2236 Instruction *Before = 0;
2237 if (CI != &BB->front())
2238 Before = prior(BasicBlock::iterator(CI));
2240 IL.LowerIntrinsicCall(CI);
2241 if (Before) { // Move iterator to instruction after call
2252 void CWriter::visitCallInst(CallInst &I) {
2253 //check if we have inline asm
2254 if (isInlineAsm(I)) {
2259 bool WroteCallee = false;
2261 // Handle intrinsic function calls first...
2262 if (Function *F = I.getCalledFunction())
2263 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2266 // If this is an intrinsic that directly corresponds to a GCC
2267 // builtin, we emit it here.
2268 const char *BuiltinName = "";
2269 #define GET_GCC_BUILTIN_NAME
2270 #include "llvm/Intrinsics.gen"
2271 #undef GET_GCC_BUILTIN_NAME
2272 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2278 case Intrinsic::vastart:
2281 Out << "va_start(*(va_list*)";
2282 writeOperand(I.getOperand(1));
2284 // Output the last argument to the enclosing function...
2285 if (I.getParent()->getParent()->arg_empty()) {
2286 cerr << "The C backend does not currently support zero "
2287 << "argument varargs functions, such as '"
2288 << I.getParent()->getParent()->getName() << "'!\n";
2291 writeOperand(--I.getParent()->getParent()->arg_end());
2294 case Intrinsic::vaend:
2295 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2296 Out << "0; va_end(*(va_list*)";
2297 writeOperand(I.getOperand(1));
2300 Out << "va_end(*(va_list*)0)";
2303 case Intrinsic::vacopy:
2305 Out << "va_copy(*(va_list*)";
2306 writeOperand(I.getOperand(1));
2307 Out << ", *(va_list*)";
2308 writeOperand(I.getOperand(2));
2311 case Intrinsic::returnaddress:
2312 Out << "__builtin_return_address(";
2313 writeOperand(I.getOperand(1));
2316 case Intrinsic::frameaddress:
2317 Out << "__builtin_frame_address(";
2318 writeOperand(I.getOperand(1));
2321 case Intrinsic::powi_f32:
2322 case Intrinsic::powi_f64:
2323 Out << "__builtin_powi(";
2324 writeOperand(I.getOperand(1));
2326 writeOperand(I.getOperand(2));
2329 case Intrinsic::setjmp:
2330 Out << "setjmp(*(jmp_buf*)";
2331 writeOperand(I.getOperand(1));
2334 case Intrinsic::longjmp:
2335 Out << "longjmp(*(jmp_buf*)";
2336 writeOperand(I.getOperand(1));
2338 writeOperand(I.getOperand(2));
2341 case Intrinsic::prefetch:
2342 Out << "LLVM_PREFETCH((const void *)";
2343 writeOperand(I.getOperand(1));
2345 writeOperand(I.getOperand(2));
2347 writeOperand(I.getOperand(3));
2350 case Intrinsic::dbg_stoppoint: {
2351 // If we use writeOperand directly we get a "u" suffix which is rejected
2353 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2357 << " \"" << SPI.getDirectory()
2358 << SPI.getFileName() << "\"\n";
2364 Value *Callee = I.getCalledValue();
2366 // If this is a call to a struct-return function, assign to the first
2367 // parameter instead of passing it to the call.
2368 bool isStructRet = I.getCallingConv() == CallingConv::CSRet;
2371 writeOperand(I.getOperand(1));
2375 if (I.isTailCall()) Out << " /*tail*/ ";
2377 const PointerType *PTy = cast<PointerType>(Callee->getType());
2378 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2381 // If this is an indirect call to a struct return function, we need to cast
2383 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2385 // GCC is a real PITA. It does not permit codegening casts of functions to
2386 // function pointers if they are in a call (it generates a trap instruction
2387 // instead!). We work around this by inserting a cast to void* in between
2388 // the function and the function pointer cast. Unfortunately, we can't just
2389 // form the constant expression here, because the folder will immediately
2392 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2393 // that void* and function pointers have the same size. :( To deal with this
2394 // in the common case, we handle casts where the number of arguments passed
2397 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2399 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2405 // Ok, just cast the pointer type.
2408 printType(Out, I.getCalledValue()->getType());
2410 printStructReturnPointerFunctionType(Out,
2411 cast<PointerType>(I.getCalledValue()->getType()));
2414 writeOperand(Callee);
2415 if (NeedsCast) Out << ')';
2420 unsigned NumDeclaredParams = FTy->getNumParams();
2422 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2424 if (isStructRet) { // Skip struct return argument.
2429 bool PrintedArg = false;
2430 for (; AI != AE; ++AI, ++ArgNo) {
2431 if (PrintedArg) Out << ", ";
2432 if (ArgNo < NumDeclaredParams &&
2433 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2435 printType(Out, FTy->getParamType(ArgNo));
2445 //This converts the llvm constraint string to something gcc is expecting.
2446 //TODO: work out platform independent constraints and factor those out
2447 // of the per target tables
2448 // handle multiple constraint codes
2449 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2451 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2453 const char** table = 0;
2455 //Grab the translation table from TargetAsmInfo if it exists
2458 const TargetMachineRegistry::Entry* Match =
2459 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2461 //Per platform Target Machines don't exist, so create it
2462 // this must be done only once
2463 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2464 TAsm = TM->getTargetAsmInfo();
2468 table = TAsm->getAsmCBE();
2470 //Search the translation table if it exists
2471 for (int i = 0; table && table[i]; i += 2)
2472 if (c.Codes[0] == table[i])
2475 //default is identity
2479 //TODO: import logic from AsmPrinter.cpp
2480 static std::string gccifyAsm(std::string asmstr) {
2481 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2482 if (asmstr[i] == '\n')
2483 asmstr.replace(i, 1, "\\n");
2484 else if (asmstr[i] == '\t')
2485 asmstr.replace(i, 1, "\\t");
2486 else if (asmstr[i] == '$') {
2487 if (asmstr[i + 1] == '{') {
2488 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2489 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2490 std::string n = "%" +
2491 asmstr.substr(a + 1, b - a - 1) +
2492 asmstr.substr(i + 2, a - i - 2);
2493 asmstr.replace(i, b - i + 1, n);
2496 asmstr.replace(i, 1, "%");
2498 else if (asmstr[i] == '%')//grr
2499 { asmstr.replace(i, 1, "%%"); ++i;}
2504 //TODO: assumptions about what consume arguments from the call are likely wrong
2505 // handle communitivity
2506 void CWriter::visitInlineAsm(CallInst &CI) {
2507 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2508 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2509 std::vector<std::pair<std::string, Value*> > Input;
2510 std::vector<std::pair<std::string, Value*> > Output;
2511 std::string Clobber;
2512 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2513 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2514 E = Constraints.end(); I != E; ++I) {
2515 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2517 InterpretASMConstraint(*I);
2520 assert(0 && "Unknown asm constraint");
2522 case InlineAsm::isInput: {
2524 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2525 ++count; //consume arg
2529 case InlineAsm::isOutput: {
2531 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2532 count ? CI.getOperand(count) : &CI));
2533 ++count; //consume arg
2537 case InlineAsm::isClobber: {
2539 Clobber += ",\"" + c + "\"";
2545 //fix up the asm string for gcc
2546 std::string asmstr = gccifyAsm(as->getAsmString());
2548 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2550 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2551 E = Output.end(); I != E; ++I) {
2552 Out << "\"" << I->first << "\"(";
2553 writeOperandRaw(I->second);
2559 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2560 E = Input.end(); I != E; ++I) {
2561 Out << "\"" << I->first << "\"(";
2562 writeOperandRaw(I->second);
2568 Out << "\n :" << Clobber.substr(1);
2572 void CWriter::visitMallocInst(MallocInst &I) {
2573 assert(0 && "lowerallocations pass didn't work!");
2576 void CWriter::visitAllocaInst(AllocaInst &I) {
2578 printType(Out, I.getType());
2579 Out << ") alloca(sizeof(";
2580 printType(Out, I.getType()->getElementType());
2582 if (I.isArrayAllocation()) {
2584 writeOperand(I.getOperand(0));
2589 void CWriter::visitFreeInst(FreeInst &I) {
2590 assert(0 && "lowerallocations pass didn't work!");
2593 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2594 gep_type_iterator E) {
2595 bool HasImplicitAddress = false;
2596 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2597 if (isa<GlobalValue>(Ptr)) {
2598 HasImplicitAddress = true;
2599 } else if (isDirectAlloca(Ptr)) {
2600 HasImplicitAddress = true;
2604 if (!HasImplicitAddress)
2605 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2607 writeOperandInternal(Ptr);
2611 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2612 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2615 writeOperandInternal(Ptr);
2617 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2619 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2622 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2623 "Can only have implicit address with direct accessing");
2625 if (HasImplicitAddress) {
2627 } else if (CI && CI->isNullValue()) {
2628 gep_type_iterator TmpI = I; ++TmpI;
2630 // Print out the -> operator if possible...
2631 if (TmpI != E && isa<StructType>(*TmpI)) {
2632 Out << (HasImplicitAddress ? "." : "->");
2633 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2639 if (isa<StructType>(*I)) {
2640 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2643 writeOperand(I.getOperand());
2648 void CWriter::visitLoadInst(LoadInst &I) {
2650 if (I.isVolatile()) {
2652 printType(Out, I.getType(), "volatile*");
2656 writeOperand(I.getOperand(0));
2662 void CWriter::visitStoreInst(StoreInst &I) {
2664 if (I.isVolatile()) {
2666 printType(Out, I.getOperand(0)->getType(), " volatile*");
2669 writeOperand(I.getPointerOperand());
2670 if (I.isVolatile()) Out << ')';
2672 writeOperand(I.getOperand(0));
2675 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2677 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2681 void CWriter::visitVAArgInst(VAArgInst &I) {
2682 Out << "va_arg(*(va_list*)";
2683 writeOperand(I.getOperand(0));
2685 printType(Out, I.getType());
2689 //===----------------------------------------------------------------------===//
2690 // External Interface declaration
2691 //===----------------------------------------------------------------------===//
2693 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2695 CodeGenFileType FileType,
2697 if (FileType != TargetMachine::AssemblyFile) return true;
2699 PM.add(createLowerGCPass());
2700 PM.add(createLowerAllocationsPass(true));
2701 PM.add(createLowerInvokePass());
2702 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2703 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2704 PM.add(new CWriter(o));