[cfe-commits] r68763 - in /cfe/trunk: include/clang/AST/Expr.h lib/AST/ExprConstant.cpp

[Anders Carlsson]

Author: andersca
Date: Thu Apr  9 23:54:13 2009
New Revision: 68763

URL: http://llvm.org/viewvc/llvm-project?rev=68763&view=rev
Log:
Add Expr::EvaluateAsLValue which will (believe it or not) try to evaluate an Expr as an LValue.

Modified:
    cfe/trunk/include/clang/AST/Expr.h
    cfe/trunk/lib/AST/ExprConstant.cpp

Modified: cfe/trunk/include/clang/AST/Expr.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/AST/Expr.h?rev=68763&r1=68762&r2=68763&view=diff

==============================================================================
--- cfe/trunk/include/clang/AST/Expr.h (original)
+++ cfe/trunk/include/clang/AST/Expr.h Thu Apr  9 23:54:13 2009
@@ -229,6 +229,9 @@
   /// must be called on an expression that constant folds to an integer.
   llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const;
 
+  /// EvaluateAsLValue - Evaluate an expression to see if it's a valid LValue.
+  bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const;
+
   /// isNullPointerConstant - C99 6.3.2.3p3 -  Return true if this is either an
   /// integer constant expression with the value zero, or if this is one that is
   /// cast to void*.

Modified: cfe/trunk/lib/AST/ExprConstant.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/ExprConstant.cpp?rev=68763&r1=68762&r2=68763&view=diff

==============================================================================
--- cfe/trunk/lib/AST/ExprConstant.cpp (original)
+++ cfe/trunk/lib/AST/ExprConstant.cpp Thu Apr  9 23:54:13 2009
@@ -1651,6 +1651,12 @@
   return true;
 }
 
+bool Expr::EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const {
+  EvalInfo Info(Ctx, Result);
+
+  return EvaluateLValue(this, Result.Val, Info) && !Result.HasSideEffects;
+}
+
 /// isEvaluatable - Call Evaluate to see if this expression can be constant
 /// folded, but discard the result.
 bool Expr::isEvaluatable(ASTContext &Ctx) const {