2006-12-08 Vladimir Prus <vladimir@codesourcery.com>

* varobj.c (varobj_create): Don't call release_value.
        (varobj_set_value): Likewise.
        (install_new_value): Call coerce_ref and release_value
        on the value. Add asserts.

gdb/ChangeLog

@@ -1,3 +1,10 @@
+2006-12-08  Vladimir Prus  <vladimir@codesourcery.com>
+
+	* varobj.c (varobj_create): Don't call release_value.
+	(varobj_set_value): Likewise.
+	(install_new_value): Call coerce_ref and release_value
+	on the value. Add asserts.
+
 2006-12-08  Nick Roberts  <nickrob@snap.net.nz>
 
 	* mi/mi-cmd-var.c (mi_cmd_var_update):  Fix memory leak.

gdb/testsuite/ChangeLog

@@ -1,3 +1,13 @@
+2006-12-08  Vladimir Prus  <vladimir@codesourcery.com>
+
+	* lib/mi-support.exp
+	(mi_runto): Accept "()" after function name.
+	(mi_create_varobj): New function.
+	(mi_varobj_update): New function.
+	(mi_Check_varobj_value): New function.
+	* gdb.mi/mi-var-cp.exp: New file.
+	* gdb.mi/mi-var-cp.cc: New file.
+	
 2006-12-01  Daniel Jacobowitz  <dan@codesourcery.com>
 
 	* gdb.base/solib-weak.c, gdb.base/solib-weak.exp, gdb.base/weaklib1.c,

gdb/testsuite/gdb.mi/mi-var-cp.cc

@@ -0,0 +1,30 @@
+/* Copyright 2006 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+ 
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  
+*/
+
+void reference_update_tests ()
+{
+  int x = 167;
+  int& rx = x;
+  x = 567;
+  x = 567;
+}
+
+int main ()
+{
+  reference_update_tests ();
+  return 0;
+}

gdb/testsuite/gdb.mi/mi-var-cp.exp

@@ -0,0 +1,73 @@
+# Copyright 2006 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  
+
+if { [skip_cplus_tests] } { continue }
+
+load_lib mi-support.exp
+set MIFLAGS "-i=mi"
+
+gdb_exit
+if [mi_gdb_start] {
+    continue
+}
+
+set testfile mi-var-cp
+set srcfile "$testfile.cc"
+set binfile $objdir/$subdir/$testfile
+
+if [get_compiler_info ${binfile} "c++"] {
+    return -1;
+}
+
+if {[gdb_compile $srcdir/$subdir/$srcfile $binfile executable {debug c++}] != ""} {
+  untested $testfile.exp
+  return -1
+}
+
+mi_gdb_load ${binfile}
+
+# Test that children of classes are properly reported
+
+# Run to main
+mi_runto reference_update_tests
+
+mi_create_varobj "RX" "rx" "create varobj for rx"
+
+set x_assignment [gdb_get_line_number "x = 567;"]
+mi_next_to "reference_update_tests" {} ".*${srcfile}" [expr $x_assignment-1] \
+    "step to x assignment"
+mi_next_to "reference_update_tests" {} ".*${srcfile}" [expr $x_assignment] \
+    "step to x assignment"
+
+mi_varobj_update RX {RX} "update RX (1)"
+
+mi_check_varobj_value RX 167 "check RX: expect 167"
+
+# Execute the first 'x = 567' line.
+mi_next_to "reference_update_tests" {} ".*${srcfile}" [expr $x_assignment+1] \
+    "step to x assignment"
+
+mi_varobj_update RX {RX} "update RX (2)"
+mi_check_varobj_value RX 567 "check RX: expect 567"
+
+# Execute the second 'x = 567' line.
+mi_next_to "reference_update_tests" {} ".*${srcfile}" [expr $x_assignment+2] \
+    "step to x assignment"
+
+mi_varobj_update RX {} "update RX (3)"
+
+mi_gdb_exit
+return 0

gdb/testsuite/lib/mi-support.exp

@@ -869,7 +869,7 @@ proc mi_runto {func} {
 
   set test "mi runto $func"
   mi_gdb_test "200-break-insert $func" \
-    "200\\^done,bkpt=\{number=\"\[0-9\]+\",type=\"breakpoint\",disp=\"keep\",enabled=\"y\",addr=\"$hex\",func=\"$func\",file=\".*\",line=\"\[0-9\]*\",times=\"0\"\}" \
+    "200\\^done,bkpt=\{number=\"\[0-9\]+\",type=\"breakpoint\",disp=\"keep\",enabled=\"y\",addr=\"$hex\",func=\"$func\(\\\(.*\\\)\)?\",file=\".*\",line=\"\[0-9\]*\",times=\"0\"\}" \
     "breakpoint at $func"
 
   if {![regexp {number="[0-9]+"} $expect_out(buffer) str]
@@ -998,3 +998,39 @@ proc mi0_continue_to { bkptno func args file line test } {
     mi0_execute_to "exec-continue" "breakpoint-hit\",bkptno=\"$bkptno" \
 	"$func" "$args" "$file" "$line" "" "$test"
 }
+
+# Creates varobj named NAME for EXPRESSION.
+# Name cannot be "-".
+proc mi_create_varobj { name expression testname } {
+    mi_gdb_test "-var-create $name * $expression" \
+        "\\^done,name=\"$name\",numchild=\"\[0-9\]+\",type=.*" \
+        $testname
+}
+
+# Updates varobj named NAME and checks that all varobjs in EXPECTED
+# are reported as updated, and no other varobj is updated.
+# Assumes that no varobj is out of scope and that no varobj changes
+# types.
+proc mi_varobj_update { name expected testname } {
+    set er "\\^done,changelist=\\\["
+    set first 1
+    foreach item $expected {
+        set v "{name=\"$item\",in_scope=\"true\",type_changed=\"false\"}"
+        if {$first} {
+            set er "$er$v"
+        } else {
+            set er "$er,$v"
+        }
+    }
+    set er "$er\\\]"
+
+    verbose -log "Expecting: $er" 2
+    mi_gdb_test "-var-update $name" $er $testname
+}
+
+proc mi_check_varobj_value { name value testname } {
+
+    mi_gdb_test "-var-evaluate-expression $name" \
+	"\\^done,value=\"$value\"" \
+	$testname
+}

gdb/varobj.c

@@ -512,10 +512,7 @@ varobj_create (char *objname,
 	   right type.  */
 	value = evaluate_type (var->root->exp);
 
-      release_value (value);
-
       var->type = value_type (value);
-
       install_new_value (var, value, 1 /* Initial assignment */);
 
       /* Set language info */
@@ -847,9 +844,7 @@ varobj_set_value (struct varobj *var, char *expression)
 	 with catch the exception.  */
       if (!gdb_value_assign (var->value, value, &val))
 	return 0;
-
-      release_value (val);
-      
+     
       /* If the value has changed, record it, so that next -var-update can
 	 report this change.  If a variable had a value of '1', we've set it
 	 to '333' and then set again to '1', when -var-update will report this
@@ -901,7 +896,10 @@ varobj_list (struct varobj ***varlist)
    and return 0.
    Otherwise, assign the value and if type_changeable returns non-zero,
    find if the new value is different from the current value.
-   Return 1 if so, and 0 if the values are equal.  */
+   Return 1 if so, and 0 if the values are equal.  
+
+   The VALUE parameter should not be released -- the function will
+   take care of releasing it when needed.  */
 static int
 install_new_value (struct varobj *var, struct value *value, int initial)
 { 
@@ -917,6 +915,15 @@ install_new_value (struct varobj *var, struct value *value, int initial)
   changeable = type_changeable (var);
   need_to_fetch = changeable;
 
+  /* We are not interested in the address of references, and given
+     that in C++ a reference is not rebindable, it cannot
+     meaningfully change.  So, get hold of the real value.  */
+  if (value)
+    {
+      value = coerce_ref (value);
+      release_value (value);
+    }
+
   if (var->type && TYPE_CODE (var->type) == TYPE_CODE_UNION)
     /* For unions, we need to fetch the value implicitly because
        of implementation of union member fetch.  When gdb
@@ -985,6 +992,8 @@ install_new_value (struct varobj *var, struct value *value, int initial)
     value_free (var->value);
   var->value = value;
   var->updated = 0;
+  
+  gdb_assert (!var->value || value_type (var->value));
 
   return changed;
 }