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[Patch] -var-evaluate-expression NAME [FORMAT]


Hi,

Here is a patch to add an optional format parameter to -var-evaluate-expression.
-var-evaluate-expression NAME [FORMAT]

This allows a frontend to request a value in a different format without changing
the current format of the variable object.

If the format is not specified, the command behaves as before (current format of 
the varObject is used.)
I kind of cheated and used NULL to indicate that the format used should be the
one stored in the varobj structure.  Instead, I could have extended the enumeration
varobj_display_formats to have a FORMAT_CURRENT entry, but I didn't like that much.

I did not update tests, run regression or changed the documentation (don't know how
to do any of these things).

Marc


### Eclipse Workspace Patch 1.0
#P gdb
Index: mi/mi-cmd-var.c
===================================================================
RCS file: /cvs/src/src/gdb/mi/mi-cmd-var.c,v
retrieving revision 1.43
diff -u -r1.43 mi-cmd-var.c
--- mi/mi-cmd-var.c     1 Jan 2008 22:53:14 -0000       1.43
+++ mi/mi-cmd-var.c     22 Jan 2008 20:22:07 -0000
@@ -57,7 +57,7 @@
   ui_out_field_int (uiout, "numchild", varobj_get_num_children (var));
   
   if (mi_print_value_p (varobj_get_gdb_type (var), print_values))
-    ui_out_field_string (uiout, "value", varobj_get_value (var));
+    ui_out_field_string (uiout, "value", varobj_get_value (var, NULL));
 
   type = varobj_get_type (var);
   if (type != NULL)
@@ -190,11 +190,33 @@
   return MI_CMD_DONE;
 }
 
+/* Parse a string argument into a format value.  */
+
+static enum varobj_display_formats
+mi_parse_format (const char *arg)
+{
+  int len;
+         
+  len = strlen (arg);
+
+  if (strncmp (arg, "natural", len) == 0)
+    return FORMAT_NATURAL;
+  else if (strncmp (arg, "binary", len) == 0)
+       return FORMAT_BINARY;
+  else if (strncmp (arg, "decimal", len) == 0)
+       return FORMAT_DECIMAL;
+  else if (strncmp (arg, "hexadecimal", len) == 0)
+       return FORMAT_HEXADECIMAL;
+  else if (strncmp (arg, "octal", len) == 0)
+       return FORMAT_OCTAL;
+  else
+    error (_("Unknown display format: must be: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
+}
+
 enum mi_cmd_result
 mi_cmd_var_set_format (char *command, char **argv, int argc)
 {
   enum varobj_display_formats format;
-  int len;
   struct varobj *var;
   char *formspec;
 
@@ -211,21 +233,8 @@
   if (formspec == NULL)
     error (_("mi_cmd_var_set_format: Must specify the format as: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
 
-  len = strlen (formspec);
-
-  if (strncmp (formspec, "natural", len) == 0)
-    format = FORMAT_NATURAL;
-  else if (strncmp (formspec, "binary", len) == 0)
-    format = FORMAT_BINARY;
-  else if (strncmp (formspec, "decimal", len) == 0)
-    format = FORMAT_DECIMAL;
-  else if (strncmp (formspec, "hexadecimal", len) == 0)
-    format = FORMAT_HEXADECIMAL;
-  else if (strncmp (formspec, "octal", len) == 0)
-    format = FORMAT_OCTAL;
-  else
-    error (_("mi_cmd_var_set_format: Unknown display format: must be: \"natural\", \"binary\", \"decimal\", \"hexadecimal\", or \"octal\""));
-
+  format = mi_parse_format(formspec);
+  
   /* Set the format of VAR to given format */
   varobj_set_display_format (var, format);
 
@@ -489,16 +498,24 @@
 mi_cmd_var_evaluate_expression (char *command, char **argv, int argc)
 {
   struct varobj *var;
+  enum varobj_display_formats format;
 
-  if (argc != 1)
-    error (_("mi_cmd_var_evaluate_expression: Usage: NAME."));
+  if (argc != 1 && argc != 2)
+    error (_("mi_cmd_var_evaluate_expression: Usage: NAME [FORMAT]"));
 
   /* Get varobj handle, if a valid var obj name was specified */
   var = varobj_get_handle (argv[0]);
   if (var == NULL)
     error (_("mi_cmd_var_evaluate_expression: Variable object not found"));
 
-  ui_out_field_string (uiout, "value", varobj_get_value (var));
+  if (argc == 2)
+    {
+         format = mi_parse_format(argv[1]);
+      ui_out_field_string (uiout, "value", varobj_get_value (var, &format));
+    }
+  else
+    ui_out_field_string (uiout, "value", varobj_get_value (var, NULL));
+
   return MI_CMD_DONE;
 }
 
@@ -524,7 +541,7 @@
   if (!varobj_set_value (var, expression))
     error (_("mi_cmd_var_assign: Could not assign expression to variable object"));
 
-  ui_out_field_string (uiout, "value", varobj_get_value (var));
+  ui_out_field_string (uiout, "value", varobj_get_value (var, NULL));
   return MI_CMD_DONE;
 }
 
@@ -645,7 +662,7 @@
            cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
          ui_out_field_string (uiout, "name", varobj_get_objname (*cc));
          if (mi_print_value_p (varobj_get_gdb_type (*cc), print_values))
-           ui_out_field_string (uiout, "value", varobj_get_value (*cc));
+           ui_out_field_string (uiout, "value", varobj_get_value (*cc, NULL));
          ui_out_field_string (uiout, "in_scope", "true");
          ui_out_field_string (uiout, "type_changed", "false");
          if (mi_version (uiout) > 1)
Index: varobj.h
===================================================================
RCS file: /cvs/src/src/gdb/varobj.h,v
retrieving revision 1.14
diff -u -r1.14 varobj.h
--- varobj.h    1 Jan 2008 22:53:13 -0000       1.14
+++ varobj.h    22 Jan 2008 20:22:07 -0000
@@ -104,7 +104,8 @@
 
 extern int varobj_get_attributes (struct varobj *var);
 
-extern char *varobj_get_value (struct varobj *var);
+extern char *varobj_get_value (struct varobj *var,
+                     enum varobj_display_formats *format);
 
 extern int varobj_set_value (struct varobj *var, char *expression);
 
Index: varobj.c
===================================================================
RCS file: /cvs/src/src/gdb/varobj.c,v
retrieving revision 1.99
diff -u -r1.99 varobj.c
--- varobj.c    1 Jan 2008 22:53:13 -0000       1.99
+++ varobj.c    22 Jan 2008 20:22:07 -0000
@@ -221,7 +221,8 @@
 
 static struct value *value_of_child (struct varobj *parent, int index);
 
-static char *my_value_of_variable (struct varobj *var);
+static char *my_value_of_variable (struct varobj *var, 
+                           enum varobj_display_formats *format);
 
 static char *value_get_print_value (struct value *value,
                                    enum varobj_display_formats format);
@@ -246,7 +247,8 @@
 
 static struct type *c_type_of_child (struct varobj *parent, int index);
 
-static char *c_value_of_variable (struct varobj *var);
+static char *c_value_of_variable (struct varobj *var,
+                           enum varobj_display_formats *format);
 
 /* C++ implementation */
 
@@ -266,7 +268,8 @@
 
 static struct type *cplus_type_of_child (struct varobj *parent, int index);
 
-static char *cplus_value_of_variable (struct varobj *var);
+static char *cplus_value_of_variable (struct varobj *var,
+                           enum varobj_display_formats *format);
 
 /* Java implementation */
 
@@ -284,7 +287,8 @@
 
 static struct type *java_type_of_child (struct varobj *parent, int index);
 
-static char *java_value_of_variable (struct varobj *var);
+static char *java_value_of_variable (struct varobj *var,
+                           enum varobj_display_formats *format);
 
 /* The language specific vector */
 
@@ -317,7 +321,8 @@
   struct type *(*type_of_child) (struct varobj * parent, int index);
 
   /* The current value of VAR. */
-  char *(*value_of_variable) (struct varobj * var);
+  char *(*value_of_variable) (struct varobj * var,
+                                     enum varobj_display_formats *format);
 };
 
 /* Array of known source language routines. */
@@ -849,11 +854,10 @@
 }
 
 char *
-varobj_get_value (struct varobj *var)
+varobj_get_value (struct varobj *var, enum varobj_display_formats *format)
 {
-  return my_value_of_variable (var);
+  return my_value_of_variable (var, format);
 }
-
 /* Set the value of an object variable (if it is editable) to the
    value of the given expression */
 /* Note: Invokes functions that can call error() */
@@ -1786,10 +1790,10 @@
 
 /* GDB already has a command called "value_of_variable". Sigh. */
 static char *
-my_value_of_variable (struct varobj *var)
+my_value_of_variable (struct varobj *var, enum varobj_display_formats *format)
 {
   if (var->root->is_valid)
-    return (*var->root->lang->value_of_variable) (var);
+    return (*var->root->lang->value_of_variable) (var, format);
   else
     return NULL;
 }
@@ -2215,8 +2219,10 @@
 }
 
 static char *
-c_value_of_variable (struct varobj *var)
+c_value_of_variable (struct varobj *var, enum varobj_display_formats *format)
 {
+  enum varobj_display_formats format_to_use;
+
   /* BOGUS: if val_print sees a struct/class, or a reference to one,
      it will print out its children instead of "{...}".  So we need to
      catch that case explicitly.  */
@@ -2260,7 +2266,12 @@
 
            gdb_assert (varobj_value_is_changeable_p (var));
            gdb_assert (!value_lazy (var->value));
-           return value_get_print_value (var->value, var->format);
+           if (format == NULL)
+                 format_to_use = var->format;
+           else
+             format_to_use = *format;
+           
+           return value_get_print_value (var->value, format_to_use);
          }
       }
     }
@@ -2586,7 +2597,7 @@
 }
 
 static char *
-cplus_value_of_variable (struct varobj *var)
+cplus_value_of_variable (struct varobj *var, enum varobj_display_formats *format)
 {
 
   /* If we have one of our special types, don't print out
@@ -2594,7 +2605,7 @@
   if (CPLUS_FAKE_CHILD (var))
     return xstrdup ("");
 
-  return c_value_of_variable (var);
+  return c_value_of_variable (var, format);
 }
 

 /* Java */
@@ -2669,9 +2680,9 @@
 }
 
 static char *
-java_value_of_variable (struct varobj *var)
+java_value_of_variable (struct varobj *var, enum varobj_display_formats *format)
 {
-  return cplus_value_of_variable (var);
+  return cplus_value_of_variable (var, format);
 }
 

 extern void _initialize_varobj (void);


 
Marc Khouzam
Software Designer, Methods and Tools
 
Ericsson Canada Inc
EMC/Q
8500 Decarie Blvd.
H4P 2N2, Mont-Royal, Qc, Canada
www.ericsson.comOffice: +514 345 7900 x42350
Fax: +514 345 6159
Mobile: +514 951 7191
Email: Marc.Khouzam@ericsson.com




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