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;
368 case Type::UByteTyID:
369 case Type::SByteTyID:
370 return Out << (isSigned?"signed":"unsigned") << " char " << NameSoFar;
371 case Type::UShortTyID:
372 case Type::ShortTyID:
373 return Out << (isSigned?"signed":"unsigned") << " short " << NameSoFar;
376 return Out << (isSigned?"signed":"unsigned") << " int " << NameSoFar;
377 case Type::ULongTyID:
379 return Out << (isSigned?"signed":"unsigned") << " long long " << NameSoFar;
380 case Type::FloatTyID: return Out << "float " << NameSoFar;
381 case Type::DoubleTyID: return Out << "double " << NameSoFar;
383 cerr << "Unknown primitive type: " << *Ty << "\n";
388 // Pass the Type* and the variable name and this prints out the variable
391 std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
392 const std::string &NameSoFar,
394 if (Ty->isPrimitiveType()) {
395 // FIXME:Signedness. When integer types are signless, this should just
396 // always pass "false" for the sign of the primitive type. The instructions
397 // will figure out how the value is to be interpreted.
398 printPrimitiveType(Out, Ty, true, NameSoFar);
402 // Check to see if the type is named.
403 if (!IgnoreName || isa<OpaqueType>(Ty)) {
404 std::map<const Type *, std::string>::iterator I = TypeNames.find(Ty);
405 if (I != TypeNames.end()) return Out << I->second << ' ' << NameSoFar;
408 switch (Ty->getTypeID()) {
409 case Type::FunctionTyID: {
410 const FunctionType *FTy = cast<FunctionType>(Ty);
411 std::stringstream FunctionInnards;
412 FunctionInnards << " (" << NameSoFar << ") (";
413 for (FunctionType::param_iterator I = FTy->param_begin(),
414 E = FTy->param_end(); I != E; ++I) {
415 if (I != FTy->param_begin())
416 FunctionInnards << ", ";
417 printType(FunctionInnards, *I, "");
419 if (FTy->isVarArg()) {
420 if (FTy->getNumParams())
421 FunctionInnards << ", ...";
422 } else if (!FTy->getNumParams()) {
423 FunctionInnards << "void";
425 FunctionInnards << ')';
426 std::string tstr = FunctionInnards.str();
427 printType(Out, FTy->getReturnType(), tstr);
430 case Type::StructTyID: {
431 const StructType *STy = cast<StructType>(Ty);
432 Out << NameSoFar + " {\n";
434 for (StructType::element_iterator I = STy->element_begin(),
435 E = STy->element_end(); I != E; ++I) {
437 printType(Out, *I, "field" + utostr(Idx++));
443 case Type::PointerTyID: {
444 const PointerType *PTy = cast<PointerType>(Ty);
445 std::string ptrName = "*" + NameSoFar;
447 if (isa<ArrayType>(PTy->getElementType()) ||
448 isa<PackedType>(PTy->getElementType()))
449 ptrName = "(" + ptrName + ")";
451 return printType(Out, PTy->getElementType(), ptrName);
454 case Type::ArrayTyID: {
455 const ArrayType *ATy = cast<ArrayType>(Ty);
456 unsigned NumElements = ATy->getNumElements();
457 if (NumElements == 0) NumElements = 1;
458 return printType(Out, ATy->getElementType(),
459 NameSoFar + "[" + utostr(NumElements) + "]");
462 case Type::PackedTyID: {
463 const PackedType *PTy = cast<PackedType>(Ty);
464 unsigned NumElements = PTy->getNumElements();
465 if (NumElements == 0) NumElements = 1;
466 return printType(Out, PTy->getElementType(),
467 NameSoFar + "[" + utostr(NumElements) + "]");
470 case Type::OpaqueTyID: {
471 static int Count = 0;
472 std::string TyName = "struct opaque_" + itostr(Count++);
473 assert(TypeNames.find(Ty) == TypeNames.end());
474 TypeNames[Ty] = TyName;
475 return Out << TyName << ' ' << NameSoFar;
478 assert(0 && "Unhandled case in getTypeProps!");
485 void CWriter::printConstantArray(ConstantArray *CPA) {
487 // As a special case, print the array as a string if it is an array of
488 // ubytes or an array of sbytes with positive values.
490 const Type *ETy = CPA->getType()->getElementType();
491 bool isString = (ETy == Type::SByteTy || ETy == Type::UByteTy);
493 // Make sure the last character is a null char, as automatically added by C
494 if (isString && (CPA->getNumOperands() == 0 ||
495 !cast<Constant>(*(CPA->op_end()-1))->isNullValue()))
500 // Keep track of whether the last number was a hexadecimal escape
501 bool LastWasHex = false;
503 // Do not include the last character, which we know is null
504 for (unsigned i = 0, e = CPA->getNumOperands()-1; i != e; ++i) {
505 unsigned char C = cast<ConstantInt>(CPA->getOperand(i))->getZExtValue();
507 // Print it out literally if it is a printable character. The only thing
508 // to be careful about is when the last letter output was a hex escape
509 // code, in which case we have to be careful not to print out hex digits
510 // explicitly (the C compiler thinks it is a continuation of the previous
511 // character, sheesh...)
513 if (isprint(C) && (!LastWasHex || !isxdigit(C))) {
515 if (C == '"' || C == '\\')
522 case '\n': Out << "\\n"; break;
523 case '\t': Out << "\\t"; break;
524 case '\r': Out << "\\r"; break;
525 case '\v': Out << "\\v"; break;
526 case '\a': Out << "\\a"; break;
527 case '\"': Out << "\\\""; break;
528 case '\'': Out << "\\\'"; break;
531 Out << (char)(( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A'));
532 Out << (char)(((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A'));
541 if (CPA->getNumOperands()) {
543 printConstant(cast<Constant>(CPA->getOperand(0)));
544 for (unsigned i = 1, e = CPA->getNumOperands(); i != e; ++i) {
546 printConstant(cast<Constant>(CPA->getOperand(i)));
553 void CWriter::printConstantPacked(ConstantPacked *CP) {
555 if (CP->getNumOperands()) {
557 printConstant(cast<Constant>(CP->getOperand(0)));
558 for (unsigned i = 1, e = CP->getNumOperands(); i != e; ++i) {
560 printConstant(cast<Constant>(CP->getOperand(i)));
566 // isFPCSafeToPrint - Returns true if we may assume that CFP may be written out
567 // textually as a double (rather than as a reference to a stack-allocated
568 // variable). We decide this by converting CFP to a string and back into a
569 // double, and then checking whether the conversion results in a bit-equal
570 // double to the original value of CFP. This depends on us and the target C
571 // compiler agreeing on the conversion process (which is pretty likely since we
572 // only deal in IEEE FP).
574 static bool isFPCSafeToPrint(const ConstantFP *CFP) {
575 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
577 sprintf(Buffer, "%a", CFP->getValue());
579 if (!strncmp(Buffer, "0x", 2) ||
580 !strncmp(Buffer, "-0x", 3) ||
581 !strncmp(Buffer, "+0x", 3))
582 return atof(Buffer) == CFP->getValue();
585 std::string StrVal = ftostr(CFP->getValue());
587 while (StrVal[0] == ' ')
588 StrVal.erase(StrVal.begin());
590 // Check to make sure that the stringized number is not some string like "Inf"
591 // or NaN. Check that the string matches the "[-+]?[0-9]" regex.
592 if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
593 ((StrVal[0] == '-' || StrVal[0] == '+') &&
594 (StrVal[1] >= '0' && StrVal[1] <= '9')))
595 // Reparse stringized version!
596 return atof(StrVal.c_str()) == CFP->getValue();
601 /// Print out the casting for a cast operation. This does the double casting
602 /// necessary for conversion to the destination type, if necessary.
603 /// @brief Print a cast
604 void CWriter::printCast(unsigned opc, const Type *SrcTy, const Type *DstTy) {
605 // Print the destination type cast
607 case Instruction::UIToFP:
608 case Instruction::SIToFP:
609 case Instruction::IntToPtr:
610 case Instruction::Trunc:
611 case Instruction::BitCast:
612 case Instruction::FPExt:
613 case Instruction::FPTrunc: // For these the DstTy sign doesn't matter
615 printType(Out, DstTy);
618 case Instruction::ZExt:
619 case Instruction::PtrToInt:
620 case Instruction::FPToUI: // For these, make sure we get an unsigned dest
622 printPrimitiveType(Out, DstTy, false);
625 case Instruction::SExt:
626 case Instruction::FPToSI: // For these, make sure we get a signed dest
628 printPrimitiveType(Out, DstTy, true);
632 assert(0 && "Invalid cast opcode");
635 // Print the source type cast
637 case Instruction::UIToFP:
638 case Instruction::ZExt:
640 printPrimitiveType(Out, SrcTy, false);
643 case Instruction::SIToFP:
644 case Instruction::SExt:
646 printPrimitiveType(Out, SrcTy, true);
649 case Instruction::IntToPtr:
650 case Instruction::PtrToInt:
651 // Avoid "cast to pointer from integer of different size" warnings
652 Out << "(unsigned long)";
654 case Instruction::Trunc:
655 case Instruction::BitCast:
656 case Instruction::FPExt:
657 case Instruction::FPTrunc:
658 case Instruction::FPToSI:
659 case Instruction::FPToUI:
660 break; // These don't need a source cast.
662 assert(0 && "Invalid cast opcode");
667 // printConstant - The LLVM Constant to C Constant converter.
668 void CWriter::printConstant(Constant *CPV) {
669 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
670 switch (CE->getOpcode()) {
671 case Instruction::Trunc:
672 case Instruction::ZExt:
673 case Instruction::SExt:
674 case Instruction::FPTrunc:
675 case Instruction::FPExt:
676 case Instruction::UIToFP:
677 case Instruction::SIToFP:
678 case Instruction::FPToUI:
679 case Instruction::FPToSI:
680 case Instruction::PtrToInt:
681 case Instruction::IntToPtr:
682 case Instruction::BitCast:
684 printCast(CE->getOpcode(), CE->getOperand(0)->getType(), CE->getType());
685 if (CE->getOpcode() == Instruction::SExt &&
686 CE->getOperand(0)->getType() == Type::BoolTy) {
687 // Make sure we really sext from bool here by subtracting from 0
690 printConstant(CE->getOperand(0));
691 if (CE->getType() == Type::BoolTy &&
692 (CE->getOpcode() == Instruction::Trunc ||
693 CE->getOpcode() == Instruction::FPToUI ||
694 CE->getOpcode() == Instruction::FPToSI ||
695 CE->getOpcode() == Instruction::PtrToInt)) {
696 // Make sure we really truncate to bool here by anding with 1
702 case Instruction::GetElementPtr:
704 printIndexingExpression(CE->getOperand(0), gep_type_begin(CPV),
708 case Instruction::Select:
710 printConstant(CE->getOperand(0));
712 printConstant(CE->getOperand(1));
714 printConstant(CE->getOperand(2));
717 case Instruction::Add:
718 case Instruction::Sub:
719 case Instruction::Mul:
720 case Instruction::SDiv:
721 case Instruction::UDiv:
722 case Instruction::FDiv:
723 case Instruction::URem:
724 case Instruction::SRem:
725 case Instruction::FRem:
726 case Instruction::And:
727 case Instruction::Or:
728 case Instruction::Xor:
729 case Instruction::ICmp:
730 case Instruction::FCmp:
731 case Instruction::Shl:
732 case Instruction::LShr:
733 case Instruction::AShr:
736 bool NeedsClosingParens = printConstExprCast(CE);
737 printConstantWithCast(CE->getOperand(0), CE->getOpcode());
738 switch (CE->getOpcode()) {
739 case Instruction::Add: Out << " + "; break;
740 case Instruction::Sub: Out << " - "; break;
741 case Instruction::Mul: Out << " * "; break;
742 case Instruction::URem:
743 case Instruction::SRem:
744 case Instruction::FRem: Out << " % "; break;
745 case Instruction::UDiv:
746 case Instruction::SDiv:
747 case Instruction::FDiv: Out << " / "; break;
748 case Instruction::And: Out << " & "; break;
749 case Instruction::Or: Out << " | "; break;
750 case Instruction::Xor: Out << " ^ "; break;
751 case Instruction::Shl: Out << " << "; break;
752 case Instruction::LShr:
753 case Instruction::AShr: Out << " >> "; break;
754 case Instruction::ICmp:
755 switch (CE->getPredicate()) {
756 case ICmpInst::ICMP_EQ: Out << " == "; break;
757 case ICmpInst::ICMP_NE: Out << " != "; break;
758 case ICmpInst::ICMP_SLT:
759 case ICmpInst::ICMP_ULT: Out << " < "; break;
760 case ICmpInst::ICMP_SLE:
761 case ICmpInst::ICMP_ULE: Out << " <= "; break;
762 case ICmpInst::ICMP_SGT:
763 case ICmpInst::ICMP_UGT: Out << " > "; break;
764 case ICmpInst::ICMP_SGE:
765 case ICmpInst::ICMP_UGE: Out << " >= "; break;
766 default: assert(0 && "Illegal ICmp predicate");
769 case Instruction::FCmp:
770 switch (CE->getPredicate()) {
771 case FCmpInst::FCMP_ORD:
772 case FCmpInst::FCMP_UEQ:
773 case FCmpInst::FCMP_OEQ: Out << " == "; break;
774 case FCmpInst::FCMP_UNO:
775 case FCmpInst::FCMP_UNE:
776 case FCmpInst::FCMP_ONE: Out << " != "; break;
777 case FCmpInst::FCMP_OLT:
778 case FCmpInst::FCMP_ULT: Out << " < "; break;
779 case FCmpInst::FCMP_OLE:
780 case FCmpInst::FCMP_ULE: Out << " <= "; break;
781 case FCmpInst::FCMP_OGT:
782 case FCmpInst::FCMP_UGT: Out << " > "; break;
783 case FCmpInst::FCMP_OGE:
784 case FCmpInst::FCMP_UGE: Out << " >= "; break;
785 default: assert(0 && "Illegal FCmp predicate");
788 default: assert(0 && "Illegal opcode here!");
790 printConstantWithCast(CE->getOperand(1), CE->getOpcode());
791 if (NeedsClosingParens)
798 cerr << "CWriter Error: Unhandled constant expression: "
802 } else if (isa<UndefValue>(CPV) && CPV->getType()->isFirstClassType()) {
804 printType(Out, CPV->getType()); // sign doesn't matter
805 Out << ")/*UNDEF*/0)";
809 switch (CPV->getType()->getTypeID()) {
811 Out << (cast<ConstantBool>(CPV)->getValue() ? '1' : '0');
813 case Type::SByteTyID:
814 case Type::UByteTyID:
815 Out << "((char)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
817 case Type::ShortTyID:
818 case Type::UShortTyID:
819 Out << "((short)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
823 Out << "((int)" << cast<ConstantInt>(CPV)->getSExtValue() << ")";
826 case Type::ULongTyID:
827 Out << "((long long)" << cast<ConstantInt>(CPV)->getSExtValue() << "ll)";
832 if ((int)cast<ConstantInt>(CPV)->getSExtValue() == (int)0x80000000)
833 Out << "((int)0x80000000U)"; // Handle MININT specially to avoid warning
835 Out << cast<ConstantInt>(CPV)->getSExtValue();
839 if (cast<ConstantInt>(CPV)->isMinValue(true))
840 Out << "(/*INT64_MIN*/(-9223372036854775807LL)-1)";
842 Out << cast<ConstantInt>(CPV)->getSExtValue() << "ll";
845 case Type::UByteTyID:
846 case Type::UShortTyID:
847 Out << cast<ConstantInt>(CPV)->getZExtValue();
850 Out << cast<ConstantInt>(CPV)->getZExtValue() << 'u';
852 case Type::ULongTyID:
853 Out << cast<ConstantInt>(CPV)->getZExtValue() << "ull";
857 case Type::FloatTyID:
858 case Type::DoubleTyID: {
859 ConstantFP *FPC = cast<ConstantFP>(CPV);
860 std::map<const ConstantFP*, unsigned>::iterator I = FPConstantMap.find(FPC);
861 if (I != FPConstantMap.end()) {
862 // Because of FP precision problems we must load from a stack allocated
863 // value that holds the value in hex.
864 Out << "(*(" << (FPC->getType() == Type::FloatTy ? "float" : "double")
865 << "*)&FPConstant" << I->second << ')';
867 if (IsNAN(FPC->getValue())) {
870 // The prefix for a quiet NaN is 0x7FF8. For a signalling NaN,
872 const unsigned long QuietNaN = 0x7ff8UL;
873 //const unsigned long SignalNaN = 0x7ff4UL;
875 // We need to grab the first part of the FP #
878 uint64_t ll = DoubleToBits(FPC->getValue());
879 sprintf(Buffer, "0x%llx", static_cast<long long>(ll));
881 std::string Num(&Buffer[0], &Buffer[6]);
882 unsigned long Val = strtoul(Num.c_str(), 0, 16);
884 if (FPC->getType() == Type::FloatTy)
885 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "F(\""
886 << Buffer << "\") /*nan*/ ";
888 Out << "LLVM_NAN" << (Val == QuietNaN ? "" : "S") << "(\""
889 << Buffer << "\") /*nan*/ ";
890 } else if (IsInf(FPC->getValue())) {
892 if (FPC->getValue() < 0) Out << '-';
893 Out << "LLVM_INF" << (FPC->getType() == Type::FloatTy ? "F" : "")
897 #if HAVE_PRINTF_A && ENABLE_CBE_PRINTF_A
898 // Print out the constant as a floating point number.
900 sprintf(Buffer, "%a", FPC->getValue());
903 Num = ftostr(FPC->getValue());
911 case Type::ArrayTyID:
912 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
913 const ArrayType *AT = cast<ArrayType>(CPV->getType());
915 if (AT->getNumElements()) {
917 Constant *CZ = Constant::getNullValue(AT->getElementType());
919 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
926 printConstantArray(cast<ConstantArray>(CPV));
930 case Type::PackedTyID:
931 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
932 const PackedType *AT = cast<PackedType>(CPV->getType());
934 if (AT->getNumElements()) {
936 Constant *CZ = Constant::getNullValue(AT->getElementType());
938 for (unsigned i = 1, e = AT->getNumElements(); i != e; ++i) {
945 printConstantPacked(cast<ConstantPacked>(CPV));
949 case Type::StructTyID:
950 if (isa<ConstantAggregateZero>(CPV) || isa<UndefValue>(CPV)) {
951 const StructType *ST = cast<StructType>(CPV->getType());
953 if (ST->getNumElements()) {
955 printConstant(Constant::getNullValue(ST->getElementType(0)));
956 for (unsigned i = 1, e = ST->getNumElements(); i != e; ++i) {
958 printConstant(Constant::getNullValue(ST->getElementType(i)));
964 if (CPV->getNumOperands()) {
966 printConstant(cast<Constant>(CPV->getOperand(0)));
967 for (unsigned i = 1, e = CPV->getNumOperands(); i != e; ++i) {
969 printConstant(cast<Constant>(CPV->getOperand(i)));
976 case Type::PointerTyID:
977 if (isa<ConstantPointerNull>(CPV)) {
979 printType(Out, CPV->getType()); // sign doesn't matter
980 Out << ")/*NULL*/0)";
982 } else if (GlobalValue *GV = dyn_cast<GlobalValue>(CPV)) {
988 cerr << "Unknown constant type: " << *CPV << "\n";
993 // Some constant expressions need to be casted back to the original types
994 // because their operands were casted to the expected type. This function takes
995 // care of detecting that case and printing the cast for the ConstantExpr.
996 bool CWriter::printConstExprCast(const ConstantExpr* CE) {
997 bool NeedsExplicitCast = false;
998 const Type *Ty = CE->getOperand(0)->getType();
999 bool TypeIsSigned = false;
1000 switch (CE->getOpcode()) {
1001 case Instruction::LShr:
1002 case Instruction::URem:
1003 case Instruction::UDiv: NeedsExplicitCast = true; break;
1004 case Instruction::AShr:
1005 case Instruction::SRem:
1006 case Instruction::SDiv: NeedsExplicitCast = true; TypeIsSigned = true; break;
1007 case Instruction::SExt:
1009 NeedsExplicitCast = true;
1010 TypeIsSigned = true;
1012 case Instruction::ZExt:
1013 case Instruction::Trunc:
1014 case Instruction::FPTrunc:
1015 case Instruction::FPExt:
1016 case Instruction::UIToFP:
1017 case Instruction::SIToFP:
1018 case Instruction::FPToUI:
1019 case Instruction::FPToSI:
1020 case Instruction::PtrToInt:
1021 case Instruction::IntToPtr:
1022 case Instruction::BitCast:
1024 NeedsExplicitCast = true;
1028 if (NeedsExplicitCast) {
1030 if (Ty->isPrimitiveType())
1031 printPrimitiveType(Out, Ty, TypeIsSigned);
1036 return NeedsExplicitCast;
1039 // Print a constant assuming that it is the operand for a given Opcode. The
1040 // opcodes that care about sign need to cast their operands to the expected
1041 // type before the operation proceeds. This function does the casting.
1042 void CWriter::printConstantWithCast(Constant* CPV, unsigned Opcode) {
1044 // Extract the operand's type, we'll need it.
1045 const Type* OpTy = CPV->getType();
1047 // Indicate whether to do the cast or not.
1048 bool shouldCast = false;
1049 bool typeIsSigned = false;
1051 // Based on the Opcode for which this Constant is being written, determine
1052 // the new type to which the operand should be casted by setting the value
1053 // of OpTy. If we change OpTy, also set shouldCast to true so it gets
1057 // for most instructions, it doesn't matter
1059 case Instruction::LShr:
1060 case Instruction::UDiv:
1061 case Instruction::URem:
1064 case Instruction::AShr:
1065 case Instruction::SDiv:
1066 case Instruction::SRem:
1068 typeIsSigned = true;
1072 // Write out the casted constant if we should, otherwise just write the
1076 printPrimitiveType(Out, OpTy, typeIsSigned);
1084 void CWriter::writeOperandInternal(Value *Operand) {
1085 if (Instruction *I = dyn_cast<Instruction>(Operand))
1086 if (isInlinableInst(*I) && !isDirectAlloca(I)) {
1087 // Should we inline this instruction to build a tree?
1094 Constant* CPV = dyn_cast<Constant>(Operand);
1095 if (CPV && !isa<GlobalValue>(CPV)) {
1098 Out << Mang->getValueName(Operand);
1102 void CWriter::writeOperandRaw(Value *Operand) {
1103 Constant* CPV = dyn_cast<Constant>(Operand);
1104 if (CPV && !isa<GlobalValue>(CPV)) {
1107 Out << Mang->getValueName(Operand);
1111 void CWriter::writeOperand(Value *Operand) {
1112 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1113 Out << "(&"; // Global variables are referenced as their addresses by llvm
1115 writeOperandInternal(Operand);
1117 if (isa<GlobalVariable>(Operand) || isDirectAlloca(Operand))
1121 // Some instructions need to have their result value casted back to the
1122 // original types because their operands were casted to the expected type.
1123 // This function takes care of detecting that case and printing the cast
1124 // for the Instruction.
1125 bool CWriter::writeInstructionCast(const Instruction &I) {
1126 const Type *Ty = I.getOperand(0)->getType();
1127 switch (I.getOpcode()) {
1128 case Instruction::LShr:
1129 case Instruction::URem:
1130 case Instruction::UDiv:
1132 printPrimitiveType(Out, Ty, false);
1135 case Instruction::AShr:
1136 case Instruction::SRem:
1137 case Instruction::SDiv:
1139 printPrimitiveType(Out, Ty, true);
1147 // Write the operand with a cast to another type based on the Opcode being used.
1148 // This will be used in cases where an instruction has specific type
1149 // requirements (usually signedness) for its operands.
1150 void CWriter::writeOperandWithCast(Value* Operand, unsigned Opcode) {
1152 // Extract the operand's type, we'll need it.
1153 const Type* OpTy = Operand->getType();
1155 // Indicate whether to do the cast or not.
1156 bool shouldCast = false;
1158 // Indicate whether the cast should be to a signed type or not.
1159 bool castIsSigned = false;
1161 // Based on the Opcode for which this Operand is being written, determine
1162 // the new type to which the operand should be casted by setting the value
1163 // of OpTy. If we change OpTy, also set shouldCast to true.
1166 // for most instructions, it doesn't matter
1168 case Instruction::LShr:
1169 case Instruction::UDiv:
1170 case Instruction::URem: // Cast to unsigned first
1172 castIsSigned = false;
1174 case Instruction::AShr:
1175 case Instruction::SDiv:
1176 case Instruction::SRem: // Cast to signed first
1178 castIsSigned = true;
1182 // Write out the casted operand if we should, otherwise just write the
1186 printPrimitiveType(Out, OpTy, castIsSigned);
1188 writeOperand(Operand);
1191 writeOperand(Operand);
1194 // Write the operand with a cast to another type based on the icmp predicate
1196 void CWriter::writeOperandWithCast(Value* Operand, ICmpInst::Predicate predicate) {
1198 // Extract the operand's type, we'll need it.
1199 const Type* OpTy = Operand->getType();
1201 // Indicate whether to do the cast or not.
1202 bool shouldCast = false;
1204 // Indicate whether the cast should be to a signed type or not.
1205 bool castIsSigned = false;
1207 // Based on the Opcode for which this Operand is being written, determine
1208 // the new type to which the operand should be casted by setting the value
1209 // of OpTy. If we change OpTy, also set shouldCast to true.
1210 switch (predicate) {
1212 // for eq and ne, it doesn't matter
1214 case ICmpInst::ICMP_UGT:
1215 case ICmpInst::ICMP_UGE:
1216 case ICmpInst::ICMP_ULT:
1217 case ICmpInst::ICMP_ULE:
1220 case ICmpInst::ICMP_SGT:
1221 case ICmpInst::ICMP_SGE:
1222 case ICmpInst::ICMP_SLT:
1223 case ICmpInst::ICMP_SLE:
1225 castIsSigned = true;
1229 // Write out the casted operand if we should, otherwise just write the
1233 if (OpTy->isPrimitiveType())
1234 printPrimitiveType(Out, OpTy, castIsSigned);
1236 printType(Out, OpTy);
1238 writeOperand(Operand);
1241 writeOperand(Operand);
1244 // generateCompilerSpecificCode - This is where we add conditional compilation
1245 // directives to cater to specific compilers as need be.
1247 static void generateCompilerSpecificCode(std::ostream& Out) {
1248 // Alloca is hard to get, and we don't want to include stdlib.h here.
1249 Out << "/* get a declaration for alloca */\n"
1250 << "#if defined(__CYGWIN__) || defined(__MINGW32__)\n"
1251 << "extern void *_alloca(unsigned long);\n"
1252 << "#define alloca(x) _alloca(x)\n"
1253 << "#elif defined(__APPLE__)\n"
1254 << "extern void *__builtin_alloca(unsigned long);\n"
1255 << "#define alloca(x) __builtin_alloca(x)\n"
1256 << "#define longjmp _longjmp\n"
1257 << "#define setjmp _setjmp\n"
1258 << "#elif defined(__sun__)\n"
1259 << "#if defined(__sparcv9)\n"
1260 << "extern void *__builtin_alloca(unsigned long);\n"
1262 << "extern void *__builtin_alloca(unsigned int);\n"
1264 << "#define alloca(x) __builtin_alloca(x)\n"
1265 << "#elif defined(__FreeBSD__) || defined(__OpenBSD__)\n"
1266 << "#define alloca(x) __builtin_alloca(x)\n"
1267 << "#elif !defined(_MSC_VER)\n"
1268 << "#include <alloca.h>\n"
1271 // We output GCC specific attributes to preserve 'linkonce'ness on globals.
1272 // If we aren't being compiled with GCC, just drop these attributes.
1273 Out << "#ifndef __GNUC__ /* Can only support \"linkonce\" vars with GCC */\n"
1274 << "#define __attribute__(X)\n"
1277 // On Mac OS X, "external weak" is spelled "__attribute__((weak_import))".
1278 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1279 << "#define __EXTERNAL_WEAK__ __attribute__((weak_import))\n"
1280 << "#elif defined(__GNUC__)\n"
1281 << "#define __EXTERNAL_WEAK__ __attribute__((weak))\n"
1283 << "#define __EXTERNAL_WEAK__\n"
1286 // For now, turn off the weak linkage attribute on Mac OS X. (See above.)
1287 Out << "#if defined(__GNUC__) && defined(__APPLE_CC__)\n"
1288 << "#define __ATTRIBUTE_WEAK__\n"
1289 << "#elif defined(__GNUC__)\n"
1290 << "#define __ATTRIBUTE_WEAK__ __attribute__((weak))\n"
1292 << "#define __ATTRIBUTE_WEAK__\n"
1295 // Define NaN and Inf as GCC builtins if using GCC, as 0 otherwise
1296 // From the GCC documentation:
1298 // double __builtin_nan (const char *str)
1300 // This is an implementation of the ISO C99 function nan.
1302 // Since ISO C99 defines this function in terms of strtod, which we do
1303 // not implement, a description of the parsing is in order. The string is
1304 // parsed as by strtol; that is, the base is recognized by leading 0 or
1305 // 0x prefixes. The number parsed is placed in the significand such that
1306 // the least significant bit of the number is at the least significant
1307 // bit of the significand. The number is truncated to fit the significand
1308 // field provided. The significand is forced to be a quiet NaN.
1310 // This function, if given a string literal, is evaluated early enough
1311 // that it is considered a compile-time constant.
1313 // float __builtin_nanf (const char *str)
1315 // Similar to __builtin_nan, except the return type is float.
1317 // double __builtin_inf (void)
1319 // Similar to __builtin_huge_val, except a warning is generated if the
1320 // target floating-point format does not support infinities. This
1321 // function is suitable for implementing the ISO C99 macro INFINITY.
1323 // float __builtin_inff (void)
1325 // Similar to __builtin_inf, except the return type is float.
1326 Out << "#ifdef __GNUC__\n"
1327 << "#define LLVM_NAN(NanStr) __builtin_nan(NanStr) /* Double */\n"
1328 << "#define LLVM_NANF(NanStr) __builtin_nanf(NanStr) /* Float */\n"
1329 << "#define LLVM_NANS(NanStr) __builtin_nans(NanStr) /* Double */\n"
1330 << "#define LLVM_NANSF(NanStr) __builtin_nansf(NanStr) /* Float */\n"
1331 << "#define LLVM_INF __builtin_inf() /* Double */\n"
1332 << "#define LLVM_INFF __builtin_inff() /* Float */\n"
1333 << "#define LLVM_PREFETCH(addr,rw,locality) "
1334 "__builtin_prefetch(addr,rw,locality)\n"
1335 << "#define __ATTRIBUTE_CTOR__ __attribute__((constructor))\n"
1336 << "#define __ATTRIBUTE_DTOR__ __attribute__((destructor))\n"
1337 << "#define LLVM_ASM __asm__\n"
1339 << "#define LLVM_NAN(NanStr) ((double)0.0) /* Double */\n"
1340 << "#define LLVM_NANF(NanStr) 0.0F /* Float */\n"
1341 << "#define LLVM_NANS(NanStr) ((double)0.0) /* Double */\n"
1342 << "#define LLVM_NANSF(NanStr) 0.0F /* Float */\n"
1343 << "#define LLVM_INF ((double)0.0) /* Double */\n"
1344 << "#define LLVM_INFF 0.0F /* Float */\n"
1345 << "#define LLVM_PREFETCH(addr,rw,locality) /* PREFETCH */\n"
1346 << "#define __ATTRIBUTE_CTOR__\n"
1347 << "#define __ATTRIBUTE_DTOR__\n"
1348 << "#define LLVM_ASM(X)\n"
1351 // Output target-specific code that should be inserted into main.
1352 Out << "#define CODE_FOR_MAIN() /* Any target-specific code for main()*/\n";
1353 // On X86, set the FP control word to 64-bits of precision instead of 80 bits.
1354 Out << "#if defined(__GNUC__) && !defined(__llvm__)\n"
1355 << "#if defined(i386) || defined(__i386__) || defined(__i386) || "
1356 << "defined(__x86_64__)\n"
1357 << "#undef CODE_FOR_MAIN\n"
1358 << "#define CODE_FOR_MAIN() \\\n"
1359 << " {short F;__asm__ (\"fnstcw %0\" : \"=m\" (*&F)); \\\n"
1360 << " F=(F&~0x300)|0x200;__asm__(\"fldcw %0\"::\"m\"(*&F));}\n"
1361 << "#endif\n#endif\n";
1365 /// FindStaticTors - Given a static ctor/dtor list, unpack its contents into
1366 /// the StaticTors set.
1367 static void FindStaticTors(GlobalVariable *GV, std::set<Function*> &StaticTors){
1368 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
1369 if (!InitList) return;
1371 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
1372 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
1373 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
1375 if (CS->getOperand(1)->isNullValue())
1376 return; // Found a null terminator, exit printing.
1377 Constant *FP = CS->getOperand(1);
1378 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
1380 FP = CE->getOperand(0);
1381 if (Function *F = dyn_cast<Function>(FP))
1382 StaticTors.insert(F);
1386 enum SpecialGlobalClass {
1388 GlobalCtors, GlobalDtors,
1392 /// getGlobalVariableClass - If this is a global that is specially recognized
1393 /// by LLVM, return a code that indicates how we should handle it.
1394 static SpecialGlobalClass getGlobalVariableClass(const GlobalVariable *GV) {
1395 // If this is a global ctors/dtors list, handle it now.
1396 if (GV->hasAppendingLinkage() && GV->use_empty()) {
1397 if (GV->getName() == "llvm.global_ctors")
1399 else if (GV->getName() == "llvm.global_dtors")
1403 // Otherwise, it it is other metadata, don't print it. This catches things
1404 // like debug information.
1405 if (GV->getSection() == "llvm.metadata")
1412 bool CWriter::doInitialization(Module &M) {
1416 IL.AddPrototypes(M);
1418 // Ensure that all structure types have names...
1419 Mang = new Mangler(M);
1420 Mang->markCharUnacceptable('.');
1422 // Keep track of which functions are static ctors/dtors so they can have
1423 // an attribute added to their prototypes.
1424 std::set<Function*> StaticCtors, StaticDtors;
1425 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1427 switch (getGlobalVariableClass(I)) {
1430 FindStaticTors(I, StaticCtors);
1433 FindStaticTors(I, StaticDtors);
1438 // get declaration for alloca
1439 Out << "/* Provide Declarations */\n";
1440 Out << "#include <stdarg.h>\n"; // Varargs support
1441 Out << "#include <setjmp.h>\n"; // Unwind support
1442 generateCompilerSpecificCode(Out);
1444 // Provide a definition for `bool' if not compiling with a C++ compiler.
1446 << "#ifndef __cplusplus\ntypedef unsigned char bool;\n#endif\n"
1448 << "\n\n/* Support for floating point constants */\n"
1449 << "typedef unsigned long long ConstantDoubleTy;\n"
1450 << "typedef unsigned int ConstantFloatTy;\n"
1452 << "\n\n/* Global Declarations */\n";
1454 // First output all the declarations for the program, because C requires
1455 // Functions & globals to be declared before they are used.
1458 // Loop over the symbol table, emitting all named constants...
1459 printModuleTypes(M.getSymbolTable());
1461 // Global variable declarations...
1462 if (!M.global_empty()) {
1463 Out << "\n/* External Global Variable Declarations */\n";
1464 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1466 if (I->hasExternalLinkage()) {
1468 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1470 } else if (I->hasDLLImportLinkage()) {
1471 Out << "__declspec(dllimport) ";
1472 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1474 } else if (I->hasExternalWeakLinkage()) {
1476 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1477 Out << " __EXTERNAL_WEAK__ ;\n";
1482 // Function declarations
1483 Out << "\n/* Function Declarations */\n";
1484 Out << "double fmod(double, double);\n"; // Support for FP rem
1485 Out << "float fmodf(float, float);\n";
1487 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
1488 // Don't print declarations for intrinsic functions.
1489 if (!I->getIntrinsicID() && I->getName() != "setjmp" &&
1490 I->getName() != "longjmp" && I->getName() != "_setjmp") {
1491 if (I->hasExternalWeakLinkage())
1493 printFunctionSignature(I, true);
1494 if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
1495 Out << " __ATTRIBUTE_WEAK__";
1496 if (I->hasExternalWeakLinkage())
1497 Out << " __EXTERNAL_WEAK__";
1498 if (StaticCtors.count(I))
1499 Out << " __ATTRIBUTE_CTOR__";
1500 if (StaticDtors.count(I))
1501 Out << " __ATTRIBUTE_DTOR__";
1503 if (I->hasName() && I->getName()[0] == 1)
1504 Out << " LLVM_ASM(\"" << I->getName().c_str()+1 << "\")";
1510 // Output the global variable declarations
1511 if (!M.global_empty()) {
1512 Out << "\n\n/* Global Variable Declarations */\n";
1513 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1515 if (!I->isExternal()) {
1516 // Ignore special globals, such as debug info.
1517 if (getGlobalVariableClass(I))
1520 if (I->hasInternalLinkage())
1524 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1526 if (I->hasLinkOnceLinkage())
1527 Out << " __attribute__((common))";
1528 else if (I->hasWeakLinkage())
1529 Out << " __ATTRIBUTE_WEAK__";
1530 else if (I->hasExternalWeakLinkage())
1531 Out << " __EXTERNAL_WEAK__";
1536 // Output the global variable definitions and contents...
1537 if (!M.global_empty()) {
1538 Out << "\n\n/* Global Variable Definitions and Initialization */\n";
1539 for (Module::global_iterator I = M.global_begin(), E = M.global_end();
1541 if (!I->isExternal()) {
1542 // Ignore special globals, such as debug info.
1543 if (getGlobalVariableClass(I))
1546 if (I->hasInternalLinkage())
1548 else if (I->hasDLLImportLinkage())
1549 Out << "__declspec(dllimport) ";
1550 else if (I->hasDLLExportLinkage())
1551 Out << "__declspec(dllexport) ";
1553 printType(Out, I->getType()->getElementType(), Mang->getValueName(I));
1554 if (I->hasLinkOnceLinkage())
1555 Out << " __attribute__((common))";
1556 else if (I->hasWeakLinkage())
1557 Out << " __ATTRIBUTE_WEAK__";
1559 // If the initializer is not null, emit the initializer. If it is null,
1560 // we try to avoid emitting large amounts of zeros. The problem with
1561 // this, however, occurs when the variable has weak linkage. In this
1562 // case, the assembler will complain about the variable being both weak
1563 // and common, so we disable this optimization.
1564 if (!I->getInitializer()->isNullValue()) {
1566 writeOperand(I->getInitializer());
1567 } else if (I->hasWeakLinkage()) {
1568 // We have to specify an initializer, but it doesn't have to be
1569 // complete. If the value is an aggregate, print out { 0 }, and let
1570 // the compiler figure out the rest of the zeros.
1572 if (isa<StructType>(I->getInitializer()->getType()) ||
1573 isa<ArrayType>(I->getInitializer()->getType()) ||
1574 isa<PackedType>(I->getInitializer()->getType())) {
1577 // Just print it out normally.
1578 writeOperand(I->getInitializer());
1586 Out << "\n\n/* Function Bodies */\n";
1591 /// Output all floating point constants that cannot be printed accurately...
1592 void CWriter::printFloatingPointConstants(Function &F) {
1593 // Scan the module for floating point constants. If any FP constant is used
1594 // in the function, we want to redirect it here so that we do not depend on
1595 // the precision of the printed form, unless the printed form preserves
1598 static unsigned FPCounter = 0;
1599 for (constant_iterator I = constant_begin(&F), E = constant_end(&F);
1601 if (const ConstantFP *FPC = dyn_cast<ConstantFP>(*I))
1602 if (!isFPCSafeToPrint(FPC) && // Do not put in FPConstantMap if safe.
1603 !FPConstantMap.count(FPC)) {
1604 double Val = FPC->getValue();
1606 FPConstantMap[FPC] = FPCounter; // Number the FP constants
1608 if (FPC->getType() == Type::DoubleTy) {
1609 Out << "static const ConstantDoubleTy FPConstant" << FPCounter++
1610 << " = 0x" << std::hex << DoubleToBits(Val) << std::dec
1611 << "ULL; /* " << Val << " */\n";
1612 } else if (FPC->getType() == Type::FloatTy) {
1613 Out << "static const ConstantFloatTy FPConstant" << FPCounter++
1614 << " = 0x" << std::hex << FloatToBits(Val) << std::dec
1615 << "U; /* " << Val << " */\n";
1617 assert(0 && "Unknown float type!");
1624 /// printSymbolTable - Run through symbol table looking for type names. If a
1625 /// type name is found, emit its declaration...
1627 void CWriter::printModuleTypes(const SymbolTable &ST) {
1628 Out << "/* Helper union for bitcasts */\n";
1629 Out << "typedef union {\n";
1630 Out << " unsigned int UInt;\n";
1631 Out << " signed int SInt;\n";
1632 Out << " unsigned long long ULong;\n";
1633 Out << " signed long long SLong;\n";
1634 Out << " float Float;\n";
1635 Out << " double Double;\n";
1636 Out << "} llvmBitCastUnion;\n";
1638 // We are only interested in the type plane of the symbol table.
1639 SymbolTable::type_const_iterator I = ST.type_begin();
1640 SymbolTable::type_const_iterator End = ST.type_end();
1642 // If there are no type names, exit early.
1643 if (I == End) return;
1645 // Print out forward declarations for structure types before anything else!
1646 Out << "/* Structure forward decls */\n";
1647 for (; I != End; ++I)
1648 if (const Type *STy = dyn_cast<StructType>(I->second)) {
1649 std::string Name = "struct l_" + Mang->makeNameProper(I->first);
1650 Out << Name << ";\n";
1651 TypeNames.insert(std::make_pair(STy, Name));
1656 // Now we can print out typedefs...
1657 Out << "/* Typedefs */\n";
1658 for (I = ST.type_begin(); I != End; ++I) {
1659 const Type *Ty = cast<Type>(I->second);
1660 std::string Name = "l_" + Mang->makeNameProper(I->first);
1662 printType(Out, Ty, Name);
1668 // Keep track of which structures have been printed so far...
1669 std::set<const StructType *> StructPrinted;
1671 // Loop over all structures then push them into the stack so they are
1672 // printed in the correct order.
1674 Out << "/* Structure contents */\n";
1675 for (I = ST.type_begin(); I != End; ++I)
1676 if (const StructType *STy = dyn_cast<StructType>(I->second))
1677 // Only print out used types!
1678 printContainedStructs(STy, StructPrinted);
1681 // Push the struct onto the stack and recursively push all structs
1682 // this one depends on.
1684 // TODO: Make this work properly with packed types
1686 void CWriter::printContainedStructs(const Type *Ty,
1687 std::set<const StructType*> &StructPrinted){
1688 // Don't walk through pointers.
1689 if (isa<PointerType>(Ty) || Ty->isPrimitiveType()) return;
1691 // Print all contained types first.
1692 for (Type::subtype_iterator I = Ty->subtype_begin(),
1693 E = Ty->subtype_end(); I != E; ++I)
1694 printContainedStructs(*I, StructPrinted);
1696 if (const StructType *STy = dyn_cast<StructType>(Ty)) {
1697 // Check to see if we have already printed this struct.
1698 if (StructPrinted.insert(STy).second) {
1699 // Print structure type out.
1700 std::string Name = TypeNames[STy];
1701 printType(Out, STy, Name, true);
1707 void CWriter::printFunctionSignature(const Function *F, bool Prototype) {
1708 /// isCStructReturn - Should this function actually return a struct by-value?
1709 bool isCStructReturn = F->getCallingConv() == CallingConv::CSRet;
1711 if (F->hasInternalLinkage()) Out << "static ";
1712 if (F->hasDLLImportLinkage()) Out << "__declspec(dllimport) ";
1713 if (F->hasDLLExportLinkage()) Out << "__declspec(dllexport) ";
1714 switch (F->getCallingConv()) {
1715 case CallingConv::X86_StdCall:
1716 Out << "__stdcall ";
1718 case CallingConv::X86_FastCall:
1719 Out << "__fastcall ";
1723 // Loop over the arguments, printing them...
1724 const FunctionType *FT = cast<FunctionType>(F->getFunctionType());
1726 std::stringstream FunctionInnards;
1728 // Print out the name...
1729 FunctionInnards << Mang->getValueName(F) << '(';
1731 bool PrintedArg = false;
1732 if (!F->isExternal()) {
1733 if (!F->arg_empty()) {
1734 Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
1736 // If this is a struct-return function, don't print the hidden
1737 // struct-return argument.
1738 if (isCStructReturn) {
1739 assert(I != E && "Invalid struct return function!");
1743 std::string ArgName;
1744 for (; I != E; ++I) {
1745 if (PrintedArg) FunctionInnards << ", ";
1746 if (I->hasName() || !Prototype)
1747 ArgName = Mang->getValueName(I);
1750 printType(FunctionInnards, I->getType(), ArgName);
1755 // Loop over the arguments, printing them.
1756 FunctionType::param_iterator I = FT->param_begin(), E = FT->param_end();
1758 // If this is a struct-return function, don't print the hidden
1759 // struct-return argument.
1760 if (isCStructReturn) {
1761 assert(I != E && "Invalid struct return function!");
1765 for (; I != E; ++I) {
1766 if (PrintedArg) FunctionInnards << ", ";
1767 printType(FunctionInnards, *I);
1772 // Finish printing arguments... if this is a vararg function, print the ...,
1773 // unless there are no known types, in which case, we just emit ().
1775 if (FT->isVarArg() && PrintedArg) {
1776 if (PrintedArg) FunctionInnards << ", ";
1777 FunctionInnards << "..."; // Output varargs portion of signature!
1778 } else if (!FT->isVarArg() && !PrintedArg) {
1779 FunctionInnards << "void"; // ret() -> ret(void) in C.
1781 FunctionInnards << ')';
1783 // Get the return tpe for the function.
1785 if (!isCStructReturn)
1786 RetTy = F->getReturnType();
1788 // If this is a struct-return function, print the struct-return type.
1789 RetTy = cast<PointerType>(FT->getParamType(0))->getElementType();
1792 // Print out the return type and the signature built above.
1793 printType(Out, RetTy, FunctionInnards.str());
1796 static inline bool isFPIntBitCast(const Instruction &I) {
1797 if (!isa<BitCastInst>(I))
1799 const Type *SrcTy = I.getOperand(0)->getType();
1800 const Type *DstTy = I.getType();
1801 return (SrcTy->isFloatingPoint() && DstTy->isInteger()) ||
1802 (DstTy->isFloatingPoint() && SrcTy->isInteger());
1805 void CWriter::printFunction(Function &F) {
1806 printFunctionSignature(&F, false);
1809 // If this is a struct return function, handle the result with magic.
1810 if (F.getCallingConv() == CallingConv::CSRet) {
1811 const Type *StructTy =
1812 cast<PointerType>(F.arg_begin()->getType())->getElementType();
1814 printType(Out, StructTy, "StructReturn");
1815 Out << "; /* Struct return temporary */\n";
1818 printType(Out, F.arg_begin()->getType(), Mang->getValueName(F.arg_begin()));
1819 Out << " = &StructReturn;\n";
1822 bool PrintedVar = false;
1824 // print local variable information for the function
1825 for (inst_iterator I = inst_begin(&F), E = inst_end(&F); I != E; ++I) {
1826 if (const AllocaInst *AI = isDirectAlloca(&*I)) {
1828 printType(Out, AI->getAllocatedType(), Mang->getValueName(AI));
1829 Out << "; /* Address-exposed local */\n";
1831 } else if (I->getType() != Type::VoidTy && !isInlinableInst(*I)) {
1833 printType(Out, I->getType(), Mang->getValueName(&*I));
1836 if (isa<PHINode>(*I)) { // Print out PHI node temporaries as well...
1838 printType(Out, I->getType(),
1839 Mang->getValueName(&*I)+"__PHI_TEMPORARY");
1844 // We need a temporary for the BitCast to use so it can pluck a value out
1845 // of a union to do the BitCast. This is separate from the need for a
1846 // variable to hold the result of the BitCast.
1847 if (isFPIntBitCast(*I)) {
1848 Out << " llvmBitCastUnion " << Mang->getValueName(&*I)
1849 << "__BITCAST_TEMPORARY;\n";
1857 if (F.hasExternalLinkage() && F.getName() == "main")
1858 Out << " CODE_FOR_MAIN();\n";
1860 // print the basic blocks
1861 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
1862 if (Loop *L = LI->getLoopFor(BB)) {
1863 if (L->getHeader() == BB && L->getParentLoop() == 0)
1866 printBasicBlock(BB);
1873 void CWriter::printLoop(Loop *L) {
1874 Out << " do { /* Syntactic loop '" << L->getHeader()->getName()
1875 << "' to make GCC happy */\n";
1876 for (unsigned i = 0, e = L->getBlocks().size(); i != e; ++i) {
1877 BasicBlock *BB = L->getBlocks()[i];
1878 Loop *BBLoop = LI->getLoopFor(BB);
1880 printBasicBlock(BB);
1881 else if (BB == BBLoop->getHeader() && BBLoop->getParentLoop() == L)
1884 Out << " } while (1); /* end of syntactic loop '"
1885 << L->getHeader()->getName() << "' */\n";
1888 void CWriter::printBasicBlock(BasicBlock *BB) {
1890 // Don't print the label for the basic block if there are no uses, or if
1891 // the only terminator use is the predecessor basic block's terminator.
1892 // We have to scan the use list because PHI nodes use basic blocks too but
1893 // do not require a label to be generated.
1895 bool NeedsLabel = false;
1896 for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
1897 if (isGotoCodeNecessary(*PI, BB)) {
1902 if (NeedsLabel) Out << Mang->getValueName(BB) << ":\n";
1904 // Output all of the instructions in the basic block...
1905 for (BasicBlock::iterator II = BB->begin(), E = --BB->end(); II != E;
1907 if (!isInlinableInst(*II) && !isDirectAlloca(II)) {
1908 if (II->getType() != Type::VoidTy && !isInlineAsm(*II))
1917 // Don't emit prefix or suffix for the terminator...
1918 visit(*BB->getTerminator());
1922 // Specific Instruction type classes... note that all of the casts are
1923 // necessary because we use the instruction classes as opaque types...
1925 void CWriter::visitReturnInst(ReturnInst &I) {
1926 // If this is a struct return function, return the temporary struct.
1927 if (I.getParent()->getParent()->getCallingConv() == CallingConv::CSRet) {
1928 Out << " return StructReturn;\n";
1932 // Don't output a void return if this is the last basic block in the function
1933 if (I.getNumOperands() == 0 &&
1934 &*--I.getParent()->getParent()->end() == I.getParent() &&
1935 !I.getParent()->size() == 1) {
1940 if (I.getNumOperands()) {
1942 writeOperand(I.getOperand(0));
1947 void CWriter::visitSwitchInst(SwitchInst &SI) {
1950 writeOperand(SI.getOperand(0));
1951 Out << ") {\n default:\n";
1952 printPHICopiesForSuccessor (SI.getParent(), SI.getDefaultDest(), 2);
1953 printBranchToBlock(SI.getParent(), SI.getDefaultDest(), 2);
1955 for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
1957 writeOperand(SI.getOperand(i));
1959 BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
1960 printPHICopiesForSuccessor (SI.getParent(), Succ, 2);
1961 printBranchToBlock(SI.getParent(), Succ, 2);
1962 if (Function::iterator(Succ) == next(Function::iterator(SI.getParent())))
1968 void CWriter::visitUnreachableInst(UnreachableInst &I) {
1969 Out << " /*UNREACHABLE*/;\n";
1972 bool CWriter::isGotoCodeNecessary(BasicBlock *From, BasicBlock *To) {
1973 /// FIXME: This should be reenabled, but loop reordering safe!!
1976 if (next(Function::iterator(From)) != Function::iterator(To))
1977 return true; // Not the direct successor, we need a goto.
1979 //isa<SwitchInst>(From->getTerminator())
1981 if (LI->getLoopFor(From) != LI->getLoopFor(To))
1986 void CWriter::printPHICopiesForSuccessor (BasicBlock *CurBlock,
1987 BasicBlock *Successor,
1989 for (BasicBlock::iterator I = Successor->begin(); isa<PHINode>(I); ++I) {
1990 PHINode *PN = cast<PHINode>(I);
1991 // Now we have to do the printing.
1992 Value *IV = PN->getIncomingValueForBlock(CurBlock);
1993 if (!isa<UndefValue>(IV)) {
1994 Out << std::string(Indent, ' ');
1995 Out << " " << Mang->getValueName(I) << "__PHI_TEMPORARY = ";
1997 Out << "; /* for PHI node */\n";
2002 void CWriter::printBranchToBlock(BasicBlock *CurBB, BasicBlock *Succ,
2004 if (isGotoCodeNecessary(CurBB, Succ)) {
2005 Out << std::string(Indent, ' ') << " goto ";
2011 // Branch instruction printing - Avoid printing out a branch to a basic block
2012 // that immediately succeeds the current one.
2014 void CWriter::visitBranchInst(BranchInst &I) {
2016 if (I.isConditional()) {
2017 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(0))) {
2019 writeOperand(I.getCondition());
2022 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 2);
2023 printBranchToBlock(I.getParent(), I.getSuccessor(0), 2);
2025 if (isGotoCodeNecessary(I.getParent(), I.getSuccessor(1))) {
2026 Out << " } else {\n";
2027 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2028 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2031 // First goto not necessary, assume second one is...
2033 writeOperand(I.getCondition());
2036 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(1), 2);
2037 printBranchToBlock(I.getParent(), I.getSuccessor(1), 2);
2042 printPHICopiesForSuccessor (I.getParent(), I.getSuccessor(0), 0);
2043 printBranchToBlock(I.getParent(), I.getSuccessor(0), 0);
2048 // PHI nodes get copied into temporary values at the end of predecessor basic
2049 // blocks. We now need to copy these temporary values into the REAL value for
2051 void CWriter::visitPHINode(PHINode &I) {
2053 Out << "__PHI_TEMPORARY";
2057 void CWriter::visitBinaryOperator(Instruction &I) {
2058 // binary instructions, shift instructions, setCond instructions.
2059 assert(!isa<PointerType>(I.getType()));
2061 // We must cast the results of binary operations which might be promoted.
2062 bool needsCast = false;
2063 if ((I.getType() == Type::UByteTy) || (I.getType() == Type::SByteTy)
2064 || (I.getType() == Type::UShortTy) || (I.getType() == Type::ShortTy)
2065 || (I.getType() == Type::FloatTy)) {
2068 printType(Out, I.getType());
2072 // If this is a negation operation, print it out as such. For FP, we don't
2073 // want to print "-0.0 - X".
2074 if (BinaryOperator::isNeg(&I)) {
2076 writeOperand(BinaryOperator::getNegArgument(cast<BinaryOperator>(&I)));
2078 } else if (I.getOpcode() == Instruction::FRem) {
2079 // Output a call to fmod/fmodf instead of emitting a%b
2080 if (I.getType() == Type::FloatTy)
2084 writeOperand(I.getOperand(0));
2086 writeOperand(I.getOperand(1));
2090 // Write out the cast of the instruction's value back to the proper type
2092 bool NeedsClosingParens = writeInstructionCast(I);
2094 // Certain instructions require the operand to be forced to a specific type
2095 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2096 // below for operand 1
2097 writeOperandWithCast(I.getOperand(0), I.getOpcode());
2099 switch (I.getOpcode()) {
2100 case Instruction::Add: Out << " + "; break;
2101 case Instruction::Sub: Out << " - "; break;
2102 case Instruction::Mul: Out << '*'; break;
2103 case Instruction::URem:
2104 case Instruction::SRem:
2105 case Instruction::FRem: Out << '%'; break;
2106 case Instruction::UDiv:
2107 case Instruction::SDiv:
2108 case Instruction::FDiv: Out << '/'; break;
2109 case Instruction::And: Out << " & "; break;
2110 case Instruction::Or: Out << " | "; break;
2111 case Instruction::Xor: Out << " ^ "; break;
2112 case Instruction::Shl : Out << " << "; break;
2113 case Instruction::LShr:
2114 case Instruction::AShr: Out << " >> "; break;
2115 default: cerr << "Invalid operator type!" << I; abort();
2118 writeOperandWithCast(I.getOperand(1), I.getOpcode());
2119 if (NeedsClosingParens)
2128 void CWriter::visitICmpInst(ICmpInst &I) {
2129 // We must cast the results of icmp which might be promoted.
2130 bool needsCast = false;
2132 // Write out the cast of the instruction's value back to the proper type
2134 bool NeedsClosingParens = writeInstructionCast(I);
2136 // Certain icmp predicate require the operand to be forced to a specific type
2137 // so we use writeOperandWithCast here instead of writeOperand. Similarly
2138 // below for operand 1
2139 writeOperandWithCast(I.getOperand(0), I.getPredicate());
2141 switch (I.getPredicate()) {
2142 case ICmpInst::ICMP_EQ: Out << " == "; break;
2143 case ICmpInst::ICMP_NE: Out << " != "; break;
2144 case ICmpInst::ICMP_ULE:
2145 case ICmpInst::ICMP_SLE: Out << " <= "; break;
2146 case ICmpInst::ICMP_UGE:
2147 case ICmpInst::ICMP_SGE: Out << " >= "; break;
2148 case ICmpInst::ICMP_ULT:
2149 case ICmpInst::ICMP_SLT: Out << " < "; break;
2150 case ICmpInst::ICMP_UGT:
2151 case ICmpInst::ICMP_SGT: Out << " > "; break;
2152 default: cerr << "Invalid icmp predicate!" << I; abort();
2155 writeOperandWithCast(I.getOperand(1), I.getPredicate());
2156 if (NeedsClosingParens)
2164 void CWriter::visitFCmpInst(FCmpInst &I) {
2165 // Write the first operand
2166 writeOperand(I.getOperand(0));
2168 // Write the predicate
2169 switch (I.getPredicate()) {
2170 case FCmpInst::FCMP_FALSE: Out << " 0 "; break;
2171 case FCmpInst::FCMP_ORD:
2172 case FCmpInst::FCMP_OEQ:
2173 case FCmpInst::FCMP_UEQ: Out << " == "; break;
2174 case FCmpInst::FCMP_UNO:
2175 case FCmpInst::FCMP_ONE:
2176 case FCmpInst::FCMP_UNE: Out << " != "; break;
2177 case FCmpInst::FCMP_ULE:
2178 case FCmpInst::FCMP_OLE: Out << " <= "; break;
2179 case FCmpInst::FCMP_UGE:
2180 case FCmpInst::FCMP_OGE: Out << " >= "; break;
2181 case FCmpInst::FCMP_ULT:
2182 case FCmpInst::FCMP_OLT: Out << " < "; break;
2183 case FCmpInst::FCMP_UGT:
2184 case FCmpInst::FCMP_OGT: Out << " > "; break;
2185 case FCmpInst::FCMP_TRUE: Out << " 1 "; break;
2186 default: cerr << "Invalid fcmp predicate!" << I; abort();
2188 // Write the second operand
2189 writeOperand(I.getOperand(1));
2192 static const char * getFloatBitCastField(const Type *Ty) {
2193 switch (Ty->getTypeID()) {
2194 default: assert(0 && "Invalid Type");
2195 case Type::FloatTyID: return "Float";
2196 case Type::UIntTyID: return "UInt";
2197 case Type::IntTyID: return "SInt";
2198 case Type::DoubleTyID:return "Double";
2199 case Type::ULongTyID: return "ULong";
2200 case Type::LongTyID: return "SLong";
2204 void CWriter::visitCastInst(CastInst &I) {
2205 const Type *DstTy = I.getType();
2206 const Type *SrcTy = I.getOperand(0)->getType();
2208 if (isFPIntBitCast(I)) {
2209 // These int<->float and long<->double casts need to be handled specially
2210 Out << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2211 << getFloatBitCastField(I.getOperand(0)->getType()) << " = ";
2212 writeOperand(I.getOperand(0));
2213 Out << ", " << Mang->getValueName(&I) << "__BITCAST_TEMPORARY."
2214 << getFloatBitCastField(I.getType());
2216 printCast(I.getOpcode(), SrcTy, DstTy);
2217 if (I.getOpcode() == Instruction::SExt && SrcTy == Type::BoolTy) {
2218 // Make sure we really get a sext from bool by subtracing the bool from 0
2221 writeOperand(I.getOperand(0));
2222 if (DstTy == Type::BoolTy &&
2223 (I.getOpcode() == Instruction::Trunc ||
2224 I.getOpcode() == Instruction::FPToUI ||
2225 I.getOpcode() == Instruction::FPToSI ||
2226 I.getOpcode() == Instruction::PtrToInt)) {
2227 // Make sure we really get a trunc to bool by anding the operand with 1
2234 void CWriter::visitSelectInst(SelectInst &I) {
2236 writeOperand(I.getCondition());
2238 writeOperand(I.getTrueValue());
2240 writeOperand(I.getFalseValue());
2245 void CWriter::lowerIntrinsics(Function &F) {
2246 for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
2247 for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
2248 if (CallInst *CI = dyn_cast<CallInst>(I++))
2249 if (Function *F = CI->getCalledFunction())
2250 switch (F->getIntrinsicID()) {
2251 case Intrinsic::not_intrinsic:
2252 case Intrinsic::vastart:
2253 case Intrinsic::vacopy:
2254 case Intrinsic::vaend:
2255 case Intrinsic::returnaddress:
2256 case Intrinsic::frameaddress:
2257 case Intrinsic::setjmp:
2258 case Intrinsic::longjmp:
2259 case Intrinsic::prefetch:
2260 case Intrinsic::dbg_stoppoint:
2261 case Intrinsic::powi_f32:
2262 case Intrinsic::powi_f64:
2263 // We directly implement these intrinsics
2266 // If this is an intrinsic that directly corresponds to a GCC
2267 // builtin, we handle it.
2268 const char *BuiltinName = "";
2269 #define GET_GCC_BUILTIN_NAME
2270 #include "llvm/Intrinsics.gen"
2271 #undef GET_GCC_BUILTIN_NAME
2272 // If we handle it, don't lower it.
2273 if (BuiltinName[0]) break;
2275 // All other intrinsic calls we must lower.
2276 Instruction *Before = 0;
2277 if (CI != &BB->front())
2278 Before = prior(BasicBlock::iterator(CI));
2280 IL.LowerIntrinsicCall(CI);
2281 if (Before) { // Move iterator to instruction after call
2292 void CWriter::visitCallInst(CallInst &I) {
2293 //check if we have inline asm
2294 if (isInlineAsm(I)) {
2299 bool WroteCallee = false;
2301 // Handle intrinsic function calls first...
2302 if (Function *F = I.getCalledFunction())
2303 if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
2306 // If this is an intrinsic that directly corresponds to a GCC
2307 // builtin, we emit it here.
2308 const char *BuiltinName = "";
2309 #define GET_GCC_BUILTIN_NAME
2310 #include "llvm/Intrinsics.gen"
2311 #undef GET_GCC_BUILTIN_NAME
2312 assert(BuiltinName[0] && "Unknown LLVM intrinsic!");
2318 case Intrinsic::vastart:
2321 Out << "va_start(*(va_list*)";
2322 writeOperand(I.getOperand(1));
2324 // Output the last argument to the enclosing function...
2325 if (I.getParent()->getParent()->arg_empty()) {
2326 cerr << "The C backend does not currently support zero "
2327 << "argument varargs functions, such as '"
2328 << I.getParent()->getParent()->getName() << "'!\n";
2331 writeOperand(--I.getParent()->getParent()->arg_end());
2334 case Intrinsic::vaend:
2335 if (!isa<ConstantPointerNull>(I.getOperand(1))) {
2336 Out << "0; va_end(*(va_list*)";
2337 writeOperand(I.getOperand(1));
2340 Out << "va_end(*(va_list*)0)";
2343 case Intrinsic::vacopy:
2345 Out << "va_copy(*(va_list*)";
2346 writeOperand(I.getOperand(1));
2347 Out << ", *(va_list*)";
2348 writeOperand(I.getOperand(2));
2351 case Intrinsic::returnaddress:
2352 Out << "__builtin_return_address(";
2353 writeOperand(I.getOperand(1));
2356 case Intrinsic::frameaddress:
2357 Out << "__builtin_frame_address(";
2358 writeOperand(I.getOperand(1));
2361 case Intrinsic::powi_f32:
2362 case Intrinsic::powi_f64:
2363 Out << "__builtin_powi(";
2364 writeOperand(I.getOperand(1));
2366 writeOperand(I.getOperand(2));
2369 case Intrinsic::setjmp:
2370 Out << "setjmp(*(jmp_buf*)";
2371 writeOperand(I.getOperand(1));
2374 case Intrinsic::longjmp:
2375 Out << "longjmp(*(jmp_buf*)";
2376 writeOperand(I.getOperand(1));
2378 writeOperand(I.getOperand(2));
2381 case Intrinsic::prefetch:
2382 Out << "LLVM_PREFETCH((const void *)";
2383 writeOperand(I.getOperand(1));
2385 writeOperand(I.getOperand(2));
2387 writeOperand(I.getOperand(3));
2390 case Intrinsic::dbg_stoppoint: {
2391 // If we use writeOperand directly we get a "u" suffix which is rejected
2393 DbgStopPointInst &SPI = cast<DbgStopPointInst>(I);
2397 << " \"" << SPI.getDirectory()
2398 << SPI.getFileName() << "\"\n";
2404 Value *Callee = I.getCalledValue();
2406 // If this is a call to a struct-return function, assign to the first
2407 // parameter instead of passing it to the call.
2408 bool isStructRet = I.getCallingConv() == CallingConv::CSRet;
2411 writeOperand(I.getOperand(1));
2415 if (I.isTailCall()) Out << " /*tail*/ ";
2417 const PointerType *PTy = cast<PointerType>(Callee->getType());
2418 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
2421 // If this is an indirect call to a struct return function, we need to cast
2423 bool NeedsCast = isStructRet && !isa<Function>(Callee);
2425 // GCC is a real PITA. It does not permit codegening casts of functions to
2426 // function pointers if they are in a call (it generates a trap instruction
2427 // instead!). We work around this by inserting a cast to void* in between
2428 // the function and the function pointer cast. Unfortunately, we can't just
2429 // form the constant expression here, because the folder will immediately
2432 // Note finally, that this is completely unsafe. ANSI C does not guarantee
2433 // that void* and function pointers have the same size. :( To deal with this
2434 // in the common case, we handle casts where the number of arguments passed
2437 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Callee))
2439 if (Function *RF = dyn_cast<Function>(CE->getOperand(0))) {
2445 // Ok, just cast the pointer type.
2448 printType(Out, I.getCalledValue()->getType());
2450 printStructReturnPointerFunctionType(Out,
2451 cast<PointerType>(I.getCalledValue()->getType()));
2454 writeOperand(Callee);
2455 if (NeedsCast) Out << ')';
2460 unsigned NumDeclaredParams = FTy->getNumParams();
2462 CallSite::arg_iterator AI = I.op_begin()+1, AE = I.op_end();
2464 if (isStructRet) { // Skip struct return argument.
2469 bool PrintedArg = false;
2470 for (; AI != AE; ++AI, ++ArgNo) {
2471 if (PrintedArg) Out << ", ";
2472 if (ArgNo < NumDeclaredParams &&
2473 (*AI)->getType() != FTy->getParamType(ArgNo)) {
2475 printType(Out, FTy->getParamType(ArgNo));
2485 //This converts the llvm constraint string to something gcc is expecting.
2486 //TODO: work out platform independent constraints and factor those out
2487 // of the per target tables
2488 // handle multiple constraint codes
2489 std::string CWriter::InterpretASMConstraint(InlineAsm::ConstraintInfo& c) {
2491 assert(c.Codes.size() == 1 && "Too many asm constraint codes to handle");
2493 const char** table = 0;
2495 //Grab the translation table from TargetAsmInfo if it exists
2498 const TargetMachineRegistry::Entry* Match =
2499 TargetMachineRegistry::getClosestStaticTargetForModule(*TheModule, E);
2501 //Per platform Target Machines don't exist, so create it
2502 // this must be done only once
2503 const TargetMachine* TM = Match->CtorFn(*TheModule, "");
2504 TAsm = TM->getTargetAsmInfo();
2508 table = TAsm->getAsmCBE();
2510 //Search the translation table if it exists
2511 for (int i = 0; table && table[i]; i += 2)
2512 if (c.Codes[0] == table[i])
2515 //default is identity
2519 //TODO: import logic from AsmPrinter.cpp
2520 static std::string gccifyAsm(std::string asmstr) {
2521 for (std::string::size_type i = 0; i != asmstr.size(); ++i)
2522 if (asmstr[i] == '\n')
2523 asmstr.replace(i, 1, "\\n");
2524 else if (asmstr[i] == '\t')
2525 asmstr.replace(i, 1, "\\t");
2526 else if (asmstr[i] == '$') {
2527 if (asmstr[i + 1] == '{') {
2528 std::string::size_type a = asmstr.find_first_of(':', i + 1);
2529 std::string::size_type b = asmstr.find_first_of('}', i + 1);
2530 std::string n = "%" +
2531 asmstr.substr(a + 1, b - a - 1) +
2532 asmstr.substr(i + 2, a - i - 2);
2533 asmstr.replace(i, b - i + 1, n);
2536 asmstr.replace(i, 1, "%");
2538 else if (asmstr[i] == '%')//grr
2539 { asmstr.replace(i, 1, "%%"); ++i;}
2544 //TODO: assumptions about what consume arguments from the call are likely wrong
2545 // handle communitivity
2546 void CWriter::visitInlineAsm(CallInst &CI) {
2547 InlineAsm* as = cast<InlineAsm>(CI.getOperand(0));
2548 std::vector<InlineAsm::ConstraintInfo> Constraints = as->ParseConstraints();
2549 std::vector<std::pair<std::string, Value*> > Input;
2550 std::vector<std::pair<std::string, Value*> > Output;
2551 std::string Clobber;
2552 int count = CI.getType() == Type::VoidTy ? 1 : 0;
2553 for (std::vector<InlineAsm::ConstraintInfo>::iterator I = Constraints.begin(),
2554 E = Constraints.end(); I != E; ++I) {
2555 assert(I->Codes.size() == 1 && "Too many asm constraint codes to handle");
2557 InterpretASMConstraint(*I);
2560 assert(0 && "Unknown asm constraint");
2562 case InlineAsm::isInput: {
2564 Input.push_back(std::make_pair(c, count ? CI.getOperand(count) : &CI));
2565 ++count; //consume arg
2569 case InlineAsm::isOutput: {
2571 Output.push_back(std::make_pair("="+((I->isEarlyClobber ? "&" : "")+c),
2572 count ? CI.getOperand(count) : &CI));
2573 ++count; //consume arg
2577 case InlineAsm::isClobber: {
2579 Clobber += ",\"" + c + "\"";
2585 //fix up the asm string for gcc
2586 std::string asmstr = gccifyAsm(as->getAsmString());
2588 Out << "__asm__ volatile (\"" << asmstr << "\"\n";
2590 for (std::vector<std::pair<std::string, Value*> >::iterator I = Output.begin(),
2591 E = Output.end(); I != E; ++I) {
2592 Out << "\"" << I->first << "\"(";
2593 writeOperandRaw(I->second);
2599 for (std::vector<std::pair<std::string, Value*> >::iterator I = Input.begin(),
2600 E = Input.end(); I != E; ++I) {
2601 Out << "\"" << I->first << "\"(";
2602 writeOperandRaw(I->second);
2608 Out << "\n :" << Clobber.substr(1);
2612 void CWriter::visitMallocInst(MallocInst &I) {
2613 assert(0 && "lowerallocations pass didn't work!");
2616 void CWriter::visitAllocaInst(AllocaInst &I) {
2618 printType(Out, I.getType());
2619 Out << ") alloca(sizeof(";
2620 printType(Out, I.getType()->getElementType());
2622 if (I.isArrayAllocation()) {
2624 writeOperand(I.getOperand(0));
2629 void CWriter::visitFreeInst(FreeInst &I) {
2630 assert(0 && "lowerallocations pass didn't work!");
2633 void CWriter::printIndexingExpression(Value *Ptr, gep_type_iterator I,
2634 gep_type_iterator E) {
2635 bool HasImplicitAddress = false;
2636 // If accessing a global value with no indexing, avoid *(&GV) syndrome
2637 if (isa<GlobalValue>(Ptr)) {
2638 HasImplicitAddress = true;
2639 } else if (isDirectAlloca(Ptr)) {
2640 HasImplicitAddress = true;
2644 if (!HasImplicitAddress)
2645 Out << '*'; // Implicit zero first argument: '*x' is equivalent to 'x[0]'
2647 writeOperandInternal(Ptr);
2651 const Constant *CI = dyn_cast<Constant>(I.getOperand());
2652 if (HasImplicitAddress && (!CI || !CI->isNullValue()))
2655 writeOperandInternal(Ptr);
2657 if (HasImplicitAddress && (!CI || !CI->isNullValue())) {
2659 HasImplicitAddress = false; // HIA is only true if we haven't addressed yet
2662 assert(!HasImplicitAddress || (CI && CI->isNullValue()) &&
2663 "Can only have implicit address with direct accessing");
2665 if (HasImplicitAddress) {
2667 } else if (CI && CI->isNullValue()) {
2668 gep_type_iterator TmpI = I; ++TmpI;
2670 // Print out the -> operator if possible...
2671 if (TmpI != E && isa<StructType>(*TmpI)) {
2672 Out << (HasImplicitAddress ? "." : "->");
2673 Out << "field" << cast<ConstantInt>(TmpI.getOperand())->getZExtValue();
2679 if (isa<StructType>(*I)) {
2680 Out << ".field" << cast<ConstantInt>(I.getOperand())->getZExtValue();
2683 writeOperand(I.getOperand());
2688 void CWriter::visitLoadInst(LoadInst &I) {
2690 if (I.isVolatile()) {
2692 printType(Out, I.getType(), "volatile*");
2696 writeOperand(I.getOperand(0));
2702 void CWriter::visitStoreInst(StoreInst &I) {
2704 if (I.isVolatile()) {
2706 printType(Out, I.getOperand(0)->getType(), " volatile*");
2709 writeOperand(I.getPointerOperand());
2710 if (I.isVolatile()) Out << ')';
2712 writeOperand(I.getOperand(0));
2715 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {
2717 printIndexingExpression(I.getPointerOperand(), gep_type_begin(I),
2721 void CWriter::visitVAArgInst(VAArgInst &I) {
2722 Out << "va_arg(*(va_list*)";
2723 writeOperand(I.getOperand(0));
2725 printType(Out, I.getType());
2729 //===----------------------------------------------------------------------===//
2730 // External Interface declaration
2731 //===----------------------------------------------------------------------===//
2733 bool CTargetMachine::addPassesToEmitWholeFile(PassManager &PM,
2735 CodeGenFileType FileType,
2737 if (FileType != TargetMachine::AssemblyFile) return true;
2739 PM.add(createLowerGCPass());
2740 PM.add(createLowerAllocationsPass(true));
2741 PM.add(createLowerInvokePass());
2742 PM.add(createCFGSimplificationPass()); // clean up after lower invoke.
2743 PM.add(new CBackendNameAllUsedStructsAndMergeFunctions());
2744 PM.add(new CWriter(o));