2011-07-28 Phil Muldoon <pmuldoon@redhat.com>

	* varobj.c (value_get_print_value): Move hint check later into the
	function.  Comment function.  Free thevalue before reusing it.

2011-07-28  Phil Muldoon  <pmuldoon@redhat.com>

	* gdb.python/py-mi.exp: Test printers returning string hint, and
	also not returning a value.
	* gdb.python/py-prettyprint.c: Add testcase for above.
	* gdb.python/py-prettyprint.py: Add test printer for above.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1320db8..2183d5b 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2011-07-28  Phil Muldoon  <pmuldoon@redhat.com>
+
+       * varobj.c (value_get_print_value): Move hint check later into the
+       function.  Comment function.  Free thevalue before reusing it.
+
 2011-07-27  Jan Kratochvil  <jan.kratochvil@redhat.com>
            Pedro Alves  <pedro@codesourcery.com>
 

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 905e2fc..9e21026 100644 (file)
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+2011-07-28  Phil Muldoon  <pmuldoon@redhat.com>
+
+       * gdb.python/py-mi.exp: Test printers returning string hint, and
+       also not returning a value.
+       * gdb.python/py-prettyprint.c: Add testcase for above.
+       * gdb.python/py-prettyprint.py: Add test printer for above.
+
 2011-07-27  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
        * gdb.dwarf2/dw2-simple-locdesc.S: Change DWARF version to 3.

diff --git a/gdb/testsuite/gdb.python/py-mi.exp b/gdb/testsuite/gdb.python/py-mi.exp
index b232fc3..0ad4310 100644 (file)
--- a/gdb/testsuite/gdb.python/py-mi.exp
+++ b/gdb/testsuite/gdb.python/py-mi.exp
@@ -284,6 +284,13 @@ mi_list_varobj_children nstype2 {
     { {nstype2.<error at 0>} {<error at 0>} 6 {char \[6\]} }
 } "list children after setting exception flag"
 
+mi_create_varobj me me \
+  "create me varobj"
+
+mi_gdb_test "-var-evaluate-expression me" \
+       "\\^done,value=\"<error reading variable: Cannot access memory.>.*\"" \
+       "evaluate me varobj"
+
 # C++ MI tests
 gdb_exit
 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}-cxx" \

diff --git a/gdb/testsuite/gdb.python/py-prettyprint.c b/gdb/testsuite/gdb.python/py-prettyprint.c
index b65a84f..30f649c 100644 (file)
--- a/gdb/testsuite/gdb.python/py-prettyprint.c
+++ b/gdb/testsuite/gdb.python/py-prettyprint.c
@@ -149,6 +149,11 @@ struct justchildren
 
 typedef struct justchildren nostring_type;
 
+struct memory_error
+{
+  const char *s;
+};
+
 struct container
 {
   string name;
@@ -227,6 +232,7 @@ main ()
   /* Clearing by being `static' could invoke an other GDB C++ bug.  */
   struct nullstr nullstr;
   nostring_type nstype, nstype2;
+  struct memory_error me;
   struct ns ns, ns2;
   struct lazystring estring, estring2;
   struct hint_error hint_error;
@@ -234,6 +240,8 @@ main ()
   nstype.elements = narray;
   nstype.len = 0;
 
+  me.s = "blah";
+
   init_ss(&ss, 1, 2);
   init_ss(ssa+0, 3, 4);
   init_ss(ssa+1, 5, 6);

diff --git a/gdb/testsuite/gdb.python/py-prettyprint.py b/gdb/testsuite/gdb.python/py-prettyprint.py
index 92280e0..8bff3c0 100644 (file)
--- a/gdb/testsuite/gdb.python/py-prettyprint.py
+++ b/gdb/testsuite/gdb.python/py-prettyprint.py
@@ -17,6 +17,7 @@
 # printers.
 
 import re
+import gdb
 
 # Test returning a Value from a printer.
 class string_print:
@@ -186,6 +187,18 @@ class pp_outer:
         yield 's', self.val['s']
         yield 'x', self.val['x']
 
+class MemoryErrorString:
+    "Raise an error"
+
+    def __init__(self, val):
+        self.val = val
+
+    def to_string(self):
+        raise gdb.MemoryError ("Cannot access memory.");
+
+    def display_hint (self):
+        return 'string'
+
 def lookup_function (val):
     "Look-up and return a pretty-printer that can print val."
 
@@ -261,6 +274,8 @@ def register_pretty_printers ():
     pretty_printers_dict[re.compile ('^struct hint_error$')]  = pp_hint_error
     pretty_printers_dict[re.compile ('^hint_error$')]  = pp_hint_error
 
+    pretty_printers_dict[re.compile ('^memory_error$')]  = MemoryErrorString
+
 pretty_printers_dict = {}
 
 register_pretty_printers ()

diff --git a/gdb/varobj.c b/gdb/varobj.c
index 2014559..eadd62b 100644 (file)
--- a/gdb/varobj.c
+++ b/gdb/varobj.c
@@ -2610,25 +2610,21 @@ value_get_print_value (struct value *value, enum varobj_display_formats format,
 
        if (PyObject_HasAttr (value_formatter, gdbpy_to_string_cst))
          {
-           char *hint;
            struct value *replacement;
            PyObject *output = NULL;
 
-           hint = gdbpy_get_display_hint (value_formatter);
-           if (hint)
-             {
-               if (!strcmp (hint, "string"))
-                 string_print = 1;
-               xfree (hint);
-             }
-
            output = apply_varobj_pretty_printer (value_formatter,
                                                  &replacement,
                                                  stb);
+
+           /* If we have string like output ...  */
            if (output)
              {
                make_cleanup_py_decref (output);
 
+               /* If this is a lazy string, extract it.  For lazy
+                  strings we always print as a string, so set
+                  string_print.  */
                if (gdbpy_is_lazy_string (output))
                  {
                    gdbpy_extract_lazy_string (output, &str_addr, &type,
@@ -2638,12 +2634,27 @@ value_get_print_value (struct value *value, enum varobj_display_formats format,
                  }
                else
                  {
+                   /* If it is a regular (non-lazy) string, extract
+                      it and copy the contents into THEVALUE.  If the
+                      hint says to print it as a string, set
+                      string_print.  Otherwise just return the extracted
+                      string as a value.  */
+
                    PyObject *py_str
                      = python_string_to_target_python_string (output);
 
                    if (py_str)
                      {
                        char *s = PyString_AsString (py_str);
+                       char *hint;
+
+                       hint = gdbpy_get_display_hint (value_formatter);
+                       if (hint)
+                         {
+                           if (!strcmp (hint, "string"))
+                             string_print = 1;
+                           xfree (hint);
+                         }
 
                        len = PyString_Size (py_str);
                        thevalue = xmemdup (s, len + 1, len + 1);
@@ -2662,6 +2673,9 @@ value_get_print_value (struct value *value, enum varobj_display_formats format,
                      gdbpy_print_stack ();
                  }
              }
+           /* If the printer returned a replacement value, set VALUE
+              to REPLACEMENT.  If there is not a replacement value,
+              just use the value passed to this function.  */
            if (replacement)
              value = replacement;
          }
@@ -2672,12 +2686,18 @@ value_get_print_value (struct value *value, enum varobj_display_formats format,
   get_formatted_print_options (&opts, format_code[(int) format]);
   opts.deref_ref = 0;
   opts.raw = 1;
+
+  /* If the THEVALUE has contents, it is a regular string.  */
   if (thevalue)
     LA_PRINT_STRING (stb, type, thevalue, len, encoding, 0, &opts);
   else if (string_print)
+    /* Otherwise, if string_print is set, and it is not a regular
+       string, it is a lazy string.  */
     val_print_string (type, encoding, str_addr, len, stb, &opts);
   else
+    /* All other cases.  */
     common_val_print (value, stb, 0, &opts, current_language);
+
   thevalue = ui_file_xstrdup (stb, NULL);
 
   do_cleanups (old_chain);