Added support for dynamic sanity checking in

expressions.  Values used by the expression are
checked by validation functions which cause the
program to crash if the values are unsafe.

Major changes:

- Added IRDynamicChecks.[ch], which contains the
  core code related to this feature

- Modified CommandObjectExpression to install the
  validator functions into the target process.

- Added an accessor to Process that gets/sets the
  helper functions

llvm-svn: 112690

lldb/source/Commands/CommandObjectExpression.cpp

@@ -190,6 +190,27 @@ bool
 CommandObjectExpression::EvaluateExpression (const char *expr, bool bare, Stream &output_stream, Stream &error_stream,
                                              CommandReturnObject *result)
 {
+    if (!m_exe_ctx.process)
+    {
+        error_stream.Printf ("Execution context doesn't contain a process");
+        return false;
+    }
+    
+    if (!m_exe_ctx.process->GetDynamicCheckers())
+    {
+        DynamicCheckerFunctions *dynamic_checkers = new DynamicCheckerFunctions();
+        
+        StreamString install_errors;
+        
+        if (!dynamic_checkers->Install(install_errors, m_exe_ctx))
+        {
+            error_stream.Printf("Couldn't install dynamic checkers into the execution context: %s", install_errors.GetData());
+            return false;
+        }
+        
+        m_exe_ctx.process->SetDynamicCheckers(dynamic_checkers);
+    }
+    
     ClangUserExpression user_expression (expr);
     
     if (!user_expression.Parse (error_stream, m_exe_ctx))