Make a home for exception specs in the AST. Now Sema can hook them up.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70506 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/AST/ASTContext.h

@@ -292,12 +292,14 @@ public:
   /// getFunctionNoProtoType - Return a K&R style C function type like 'int()'.
   ///
   QualType getFunctionNoProtoType(QualType ResultTy);
-  
+
   /// getFunctionType - Return a normal function type with a typed argument
   /// list.  isVariadic indicates whether the argument list includes '...'.
   QualType getFunctionType(QualType ResultTy, const QualType *ArgArray,
                            unsigned NumArgs, bool isVariadic,
-                           unsigned TypeQuals);
+                           unsigned TypeQuals, bool hasExceptionSpec = false,
+                           bool hasAnyExceptionSpec = false,
+                           unsigned NumExs = 0, const QualType *ExArray = 0);
 
   /// getTypeDeclType - Return the unique reference to the type for
   /// the specified type declaration.

include/clang/AST/Type.h

@@ -1152,23 +1152,42 @@ class FunctionProtoType : public FunctionType, public llvm::FoldingSetNode {
   }
 
   FunctionProtoType(QualType Result, const QualType *ArgArray, unsigned numArgs,
-                    bool isVariadic, unsigned typeQuals, QualType Canonical)
+                    bool isVariadic, unsigned typeQuals, bool hasExs,
+                    bool hasAnyExs, const QualType *ExArray,
+                    unsigned numExs, QualType Canonical)
     : FunctionType(FunctionProto, Result, isVariadic, typeQuals, Canonical,
                    (Result->isDependentType() || 
                     hasAnyDependentType(ArgArray, numArgs))),
-      NumArgs(numArgs) {
+      NumArgs(numArgs), NumExceptions(numExs), HasExceptionSpec(hasExs),
+      AnyExceptionSpec(hasAnyExs) {
     // Fill in the trailing argument array.
-    QualType *ArgInfo = reinterpret_cast<QualType *>(this+1);;
+    QualType *ArgInfo = reinterpret_cast<QualType*>(this+1);
     for (unsigned i = 0; i != numArgs; ++i)
       ArgInfo[i] = ArgArray[i];
+    // Fill in the exception array.
+    QualType *Ex = ArgInfo + numArgs;
+    for (unsigned i = 0; i != numExs; ++i)
+      Ex[i] = ExArray[i];
   }
-  
+
   /// NumArgs - The number of arguments this function has, not counting '...'.
-  unsigned NumArgs;
-  
+  unsigned NumArgs : 20;
+
+  /// NumExceptions - The number of types in the exception spec, if any.
+  unsigned NumExceptions : 10;
+
+  /// HasExceptionSpec - Whether this function has an exception spec at all.
+  bool HasExceptionSpec : 1;
+
+  /// AnyExceptionSpec - Whether this function has a throw(...) spec.
+  bool AnyExceptionSpec : 1;
+
   /// ArgInfo - There is an variable size array after the class in memory that
   /// holds the argument types.
-  
+
+  /// Exceptions - There is another variable size array after ArgInfo that
+  /// holds the exception types.
+
   friend class ASTContext;  // ASTContext creates these.
 
 public:
@@ -1177,7 +1196,15 @@ public:
     assert(i < NumArgs && "Invalid argument number!");
     return arg_type_begin()[i];
   }
-    
+
+  bool hasExceptionSpec() const { return HasExceptionSpec; }
+  bool hasAnyExceptionSpec() const { return AnyExceptionSpec; }
+  unsigned getNumExceptions() const { return NumExceptions; }
+  QualType getExceptionType(unsigned i) const {
+    assert(i < NumExceptions && "Invalid exception number!");
+    return exception_begin()[i];
+  }
+
   bool isVariadic() const { return getSubClassData(); }
   unsigned getTypeQuals() const { return FunctionType::getTypeQuals(); }
   
@@ -1186,18 +1213,29 @@ public:
     return reinterpret_cast<const QualType *>(this+1);
   }
   arg_type_iterator arg_type_end() const { return arg_type_begin()+NumArgs; }
-  
+
+  typedef const QualType *exception_iterator;
+  exception_iterator exception_begin() const {
+    // exceptions begin where arguments end
+    return arg_type_end();
+  }
+  exception_iterator exception_end() const {
+    return exception_begin() + NumExceptions;
+  }
+
   virtual void getAsStringInternal(std::string &InnerString) const;
 
   static bool classof(const Type *T) {
     return T->getTypeClass() == FunctionProto;
   }
   static bool classof(const FunctionProtoType *) { return true; }
-  
+
   void Profile(llvm::FoldingSetNodeID &ID);
   static void Profile(llvm::FoldingSetNodeID &ID, QualType Result,
                       arg_type_iterator ArgTys, unsigned NumArgs,
-                      bool isVariadic, unsigned TypeQuals);
+                      bool isVariadic, unsigned TypeQuals,
+                      bool hasExceptionSpec, bool anyExceptionSpec,
+                      unsigned NumExceptions, exception_iterator Exs);
 };
 
 

lib/AST/ASTContext.cpp

@@ -1321,12 +1321,15 @@ QualType ASTContext::getFunctionNoProtoType(QualType ResultTy) {
 /// list.  isVariadic indicates whether the argument list includes '...'.
 QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray,
                                      unsigned NumArgs, bool isVariadic,
-                                     unsigned TypeQuals) {
+                                     unsigned TypeQuals, bool hasExceptionSpec,
+                                     bool hasAnyExceptionSpec, unsigned NumExs,
+                                     const QualType *ExArray) {
   // Unique functions, to guarantee there is only one function of a particular
   // structure.
   llvm::FoldingSetNodeID ID;
   FunctionProtoType::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic,
-                             TypeQuals);
+                             TypeQuals, hasExceptionSpec, hasAnyExceptionSpec,
+                             NumExs, ExArray);
 
   void *InsertPos = 0;
   if (FunctionProtoType *FTP = 
@@ -1346,24 +1349,32 @@ QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray,
     CanonicalArgs.reserve(NumArgs);
     for (unsigned i = 0; i != NumArgs; ++i)
       CanonicalArgs.push_back(getCanonicalType(ArgArray[i]));
-    
+    llvm::SmallVector<QualType, 2> CanonicalExs;
+    CanonicalExs.reserve(NumExs);
+    for (unsigned i = 0; i != NumExs; ++i)
+      CanonicalExs.push_back(getCanonicalType(ExArray[i]));
+
     Canonical = getFunctionType(getCanonicalType(ResultTy),
                                 &CanonicalArgs[0], NumArgs,
-                                isVariadic, TypeQuals);
-    
+                                isVariadic, TypeQuals, hasExceptionSpec,
+                                hasAnyExceptionSpec, NumExs, &CanonicalExs[0]);
+
     // Get the new insert position for the node we care about.
     FunctionProtoType *NewIP =
       FunctionProtoTypes.FindNodeOrInsertPos(ID, InsertPos);
     assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP;
   }
-  
+
   // FunctionProtoType objects are allocated with extra bytes after them
-  // for a variable size array (for parameter types) at the end of them.
+  // for two variable size arrays (for parameter and exception types) at the
+  // end of them.
   FunctionProtoType *FTP = 
-    (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) + 
-                                 NumArgs*sizeof(QualType), 8);
+    (FunctionProtoType*)Allocate(sizeof(FunctionProtoType) +
+                                 NumArgs*sizeof(QualType) +
+                                 NumExs*sizeof(QualType), 8);
   new (FTP) FunctionProtoType(ResultTy, ArgArray, NumArgs, isVariadic,
-                              TypeQuals, Canonical);
+                              TypeQuals, hasExceptionSpec, hasAnyExceptionSpec,
+                              ExArray, NumExs, Canonical);
   Types.push_back(FTP);
   FunctionProtoTypes.InsertNode(FTP, InsertPos);
   return QualType(FTP, 0);
@@ -2930,6 +2941,8 @@ QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) {
     allRTypes = false;
 
   if (lproto && rproto) { // two C99 style function prototypes
+    assert(!lproto->hasExceptionSpec() && !rproto->hasExceptionSpec() &&
+           "C++ shouldn't be here");
     unsigned lproto_nargs = lproto->getNumArgs();
     unsigned rproto_nargs = rproto->getNumArgs();
 
@@ -2968,6 +2981,7 @@ QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) {
 
   const FunctionProtoType *proto = lproto ? lproto : rproto;
   if (proto) {
+    assert(!proto->hasExceptionSpec() && "C++ shouldn't be here");
     if (proto->isVariadic()) return QualType();
     // Check that the types are compatible with the types that
     // would result from default argument promotions (C99 6.7.5.3p15).

lib/AST/Type.cpp

@@ -920,17 +920,26 @@ const char *BuiltinType::getName() const {
 void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID, QualType Result,
                                 arg_type_iterator ArgTys,
                                 unsigned NumArgs, bool isVariadic,
-                                unsigned TypeQuals) {
+                                unsigned TypeQuals, bool hasExceptionSpec,
+                                bool anyExceptionSpec, unsigned NumExceptions,
+                                exception_iterator Exs) {
   ID.AddPointer(Result.getAsOpaquePtr());
   for (unsigned i = 0; i != NumArgs; ++i)
     ID.AddPointer(ArgTys[i].getAsOpaquePtr());
   ID.AddInteger(isVariadic);
   ID.AddInteger(TypeQuals);
+  ID.AddInteger(hasExceptionSpec);
+  if (hasExceptionSpec) {
+    ID.AddInteger(anyExceptionSpec);
+    for(unsigned i = 0; i != NumExceptions; ++i)
+      ID.AddPointer(Exs[i].getAsOpaquePtr());
+  }
 }
 
 void FunctionProtoType::Profile(llvm::FoldingSetNodeID &ID) {
   Profile(ID, getResultType(), arg_type_begin(), NumArgs, isVariadic(),
-          getTypeQuals());
+          getTypeQuals(), hasExceptionSpec(), hasAnyExceptionSpec(),
+          getNumExceptions(), exception_begin());
 }
 
 void ObjCQualifiedInterfaceType::Profile(llvm::FoldingSetNodeID &ID,

lib/Frontend/PCHReader.cpp

@@ -1584,8 +1584,16 @@ QualType PCHReader::ReadTypeRecord(uint64_t Offset) {
       ParamTypes.push_back(GetType(Record[Idx++]));
     bool isVariadic = Record[Idx++];
     unsigned Quals = Record[Idx++];
+    bool hasExceptionSpec = Record[Idx++];
+    bool hasAnyExceptionSpec = Record[Idx++];
+    unsigned NumExceptions = Record[Idx++];
+    llvm::SmallVector<QualType, 2> Exceptions;
+    for (unsigned I = 0; I != NumExceptions; ++I)
+      Exceptions.push_back(GetType(Record[Idx++]));
     return Context->getFunctionType(ResultType, &ParamTypes[0], NumParams,
-                                    isVariadic, Quals);
+                                    isVariadic, Quals, hasExceptionSpec,
+                                    hasAnyExceptionSpec, NumExceptions,
+                                    &Exceptions[0]);
   }
 
   case pch::TYPE_TYPEDEF:

lib/Frontend/PCHWriter.cpp

@@ -161,6 +161,11 @@ void PCHTypeWriter::VisitFunctionProtoType(const FunctionProtoType *T) {
     Writer.AddTypeRef(T->getArgType(I), Record);
   Record.push_back(T->isVariadic());
   Record.push_back(T->getTypeQuals());
+  Record.push_back(T->hasExceptionSpec());
+  Record.push_back(T->hasAnyExceptionSpec());
+  Record.push_back(T->getNumExceptions());
+  for (unsigned I = 0, N = T->getNumExceptions(); I != N; ++I)
+    Writer.AddTypeRef(T->getExceptionType(I), Record);
   Code = pch::TYPE_FUNCTION_PROTO;
 }
 

lib/Sema/SemaDecl.cpp

@@ -714,6 +714,7 @@ bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) {
         (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
       // The old declaration provided a function prototype, but the
       // new declaration does not. Merge in the prototype.
+      assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
       llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(),
                                                  OldProto->arg_type_end());
       NewQType = Context.getFunctionType(NewFuncType->getResultType(),

lib/Sema/SemaDeclCXX.cpp

@@ -995,6 +995,9 @@ void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) {
   QualType ClassType = Context.getTypeDeclType(ClassDecl);
   ClassType = Context.getCanonicalType(ClassType);
 
+  // FIXME: Implicit declarations have exception specifications, which are
+  // the union of the specifications of the implicitly called functions.
+
   if (!ClassDecl->hasUserDeclaredConstructor()) {
     // C++ [class.ctor]p5:
     //   A default constructor for a class X is a constructor of class X