Removed "hasImplicitControlFlow" from class CFG, and moved it to class Stmt

as a member function.  This function is no longer needed within the CFG
class, and logically belongs to the Stmt class as a predicate for a
Stmt instance.

llvm-svn: 42489

clang/AST/CFG.cpp

@@ -1237,30 +1237,6 @@ void CFGBlock::print(std::ostream& OS, const CFG* cfg) const {
   print_block(OS, cfg, *this, &Helper, true);
 }
 
-/// hasImplicitControlFlow - Returns true if a given expression is
-///  is represented within a CFG as having a designated "statement slot"
-bool CFG::hasImplicitControlFlow(const Stmt* S) {
-  switch (S->getStmtClass()) {
-    default:
-      return false;
-
-    case Stmt::CallExprClass:
-    case Stmt::ConditionalOperatorClass:
-    case Stmt::ChooseExprClass:
-    case Stmt::StmtExprClass:
-    case Stmt::DeclStmtClass:
-      return true;    
-      
-    case Stmt::BinaryOperatorClass: {
-      const BinaryOperator* B = cast<BinaryOperator>(S);
-      if (B->isLogicalOp() || B->getOpcode() == BinaryOperator::Comma)
-        return true;
-      else
-        return false;
-    }
-  }
-}
-
 //===----------------------------------------------------------------------===//
 // CFG Graphviz Visualization
 //===----------------------------------------------------------------------===//

clang/AST/Stmt.cpp

@@ -89,6 +89,28 @@ SourceRange ReturnStmt::getSourceRange() const {
     return SourceRange(RetLoc);
 }
 
+bool Stmt::hasImplicitControlFlow() const {
+  switch (sClass) {
+    default:
+      return false;
+      
+    case CallExprClass:
+    case ConditionalOperatorClass:
+    case ChooseExprClass:
+    case StmtExprClass:
+    case DeclStmtClass:
+      return true;    
+      
+    case Stmt::BinaryOperatorClass: {
+      const BinaryOperator* B = cast<BinaryOperator>(this);
+      if (B->isLogicalOp() || B->getOpcode() == BinaryOperator::Comma)
+        return true;
+      else
+        return false;
+    }
+  }
+}
+
 //===----------------------------------------------------------------------===//
 //  Child Iterators for iterating over subexpressions/substatements
 //===----------------------------------------------------------------------===//

clang/include/clang/AST/CFG.h

@@ -273,45 +273,6 @@ public:
   void print(std::ostream& OS) const;
   void dump() const;
 
-  //===--------------------------------------------------------------------===//
-  // Static Predicates pertaining to CFG-related properties.
-  //===--------------------------------------------------------------------===//
-  
-  /// hasImplicitControlFlow - Returns true if a given expression is
-  ///  is represented within a CFG as having a designated "statement slot"
-  ///  within a CFGBlock to represent the execution of that expression.  This
-  ///  is usefull for expressions that contain implicit control flow, such
-  ///  as &&, ||, and ? operators, as well as commas and statement expressions.
-  ///
-  ///  For example, considering a CFGBlock with the following statement:
-  ///  
-  ///    (1) x = ... ? ... ? ...
-  ///  
-  ///  When the CFG is built, this logically becomes:
-  ///  
-  ///    (1) ... ? ... : ...  (a unique statement	slot for the ternary ?)
-  ///    (2) x	= [E1]        (where E1 is	actually the ConditionalOperator*)
-  ///  
-  ///  A client of the CFG, when walking the statement at (2), will encounter
-  ///  E1.  In	this case, hasImplicitControlFlow(E1) == true, and the client
-  ///  will know that the expression E1 is explicitly placed into its own 
-  ///  statement slot to	capture	the implicit control-flow it has.
-  ///  
-  ///  Special cases:
-  ///
-  ///  (1) Function calls.
-  ///  Function calls are placed in their own statement slot so that
-  ///  that we have a clear identification of "call-return" sites.  If
-  ///  you see a CallExpr nested as a subexpression of E, the CallExpr appears
-  ///  in a statement slot in the CFG that dominates the location of E.
-  ///
-  ///  (2) DeclStmts
-  ///  We include DeclStmts because the initializer expressions for Decls
-  ///  will be separated out into distinct statements in the CFG.  These
-  ///  statements will dominate the Decl.
-  ///
-  static bool hasImplicitControlFlow(const Stmt* S);  
-
   //===--------------------------------------------------------------------===//
   // Internal: constructors and data.
   //===--------------------------------------------------------------------===//

clang/include/clang/AST/Stmt.h

@@ -85,6 +85,13 @@ public:
   // Implement isa<T> support.
   static bool classof(const Stmt *) { return true; }  
   
+  /// hasImplicitControlFlow - Some statements (e.g. short circuited operations)
+  ///  contain implicit control-flow in the order their subexpressions
+  ///  are evaluated.  This predicate returns true if this statement has
+  ///  such implicit control-flow.  Such statements are also specially handled
+  ///  within CFGs.
+  bool hasImplicitControlFlow() const;
+
   /// Child Iterators: All subclasses must implement child_begin and child_end
   ///  to permit easy iteration over the substatements/subexpessions of an
   ///  AST node.  This permits easy iteration over all nodes in the AST.