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* findvar.c (read_var_value): Never return NULL, throw an error
	instead.  Update the function comment.  State symbol name in the error
	messages.
	* python/py-frame.c (frapy_read_var): Remove handling of NULL from
	read_var_value.
	* stack.c (print_frame_args): Likewise.
	* valops.c (value_of_variable): Likewise.
This commit is contained in:
Jan Kratochvil 2011-09-08 15:26:08 +00:00
parent b99b5f66e1
commit 8afd712c6f
5 changed files with 41 additions and 43 deletions
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10
gdb/ChangeLog
View file

@ -1,3 +1,13 @@
2011-09-08 Jan Kratochvil <jan.kratochvil@redhat.com>
* findvar.c (read_var_value): Never return NULL, throw an error
instead. Update the function comment. State symbol name in the error
messages.
* python/py-frame.c (frapy_read_var): Remove handling of NULL from
read_var_value.
* stack.c (print_frame_args): Likewise.
* valops.c (value_of_variable): Likewise.
2011-09-08 Jan Kratochvil <jan.kratochvil@redhat.com>
* stack.c (print_frame_args): New variable except. Wrap

22
gdb/findvar.c
View file

@ -409,7 +409,7 @@ symbol_read_needs_frame (struct symbol *sym)
/* Given a struct symbol for a variable,
and a stack frame id, read the value of the variable
and return a (pointer to a) struct value containing the value.
If the variable cannot be found, return a zero pointer. */
If the variable cannot be found, throw error. */
struct value *
read_var_value (struct symbol *var, struct frame_info *frame)
@ -477,7 +477,8 @@ read_var_value (struct symbol *var, struct frame_info *frame)
case LOC_ARG:
addr = get_frame_args_address (frame);
if (!addr)
return 0;
error (_("Unknown argument list address for `%s'."),
SYMBOL_PRINT_NAME (var));
addr += SYMBOL_VALUE (var);
v = allocate_value_lazy (type);
break;
@ -489,7 +490,8 @@ read_var_value (struct symbol *var, struct frame_info *frame)
argref = get_frame_args_address (frame);
if (!argref)
return 0;
error (_("Unknown argument list address for `%s'."),
SYMBOL_PRINT_NAME (var));
argref += SYMBOL_VALUE (var);
ref = value_at (lookup_pointer_type (type), argref);
addr = value_as_address (ref);
@ -504,7 +506,8 @@ read_var_value (struct symbol *var, struct frame_info *frame)
break;
case LOC_TYPEDEF:
error (_("Cannot look up value of a typedef"));
error (_("Cannot look up value of a typedef `%s'."),
SYMBOL_PRINT_NAME (var));
break;
case LOC_BLOCK:
@ -530,7 +533,8 @@ read_var_value (struct symbol *var, struct frame_info *frame)
frame);
if (regval == NULL)
error (_("Value of register variable not available."));
error (_("Value of register variable not available for `%s'."),
SYMBOL_PRINT_NAME (var));
addr = value_as_address (regval);
v = allocate_value_lazy (type);
@ -540,7 +544,8 @@ read_var_value (struct symbol *var, struct frame_info *frame)
regval = value_from_register (type, regno, frame);
if (regval == NULL)
error (_("Value of register variable not available."));
error (_("Value of register variable not available for `%s'."),
SYMBOL_PRINT_NAME (var));
return regval;
}
}
@ -561,7 +566,7 @@ read_var_value (struct symbol *var, struct frame_info *frame)
msym = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (var), NULL, NULL);
if (msym == NULL)
return 0;
error (_("No global symbol \"%s\"."), SYMBOL_LINKAGE_NAME (var));
if (overlay_debugging)
addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym),
SYMBOL_OBJ_SECTION (msym));
@ -580,7 +585,8 @@ read_var_value (struct symbol *var, struct frame_info *frame)
return allocate_optimized_out_value (type);
default:
error (_("Cannot look up value of a botched symbol."));
error (_("Cannot look up value of a botched symbol `%s'."),
SYMBOL_PRINT_NAME (var));
break;
}

8
gdb/python/py-frame.c
View file

@ -467,14 +467,6 @@ frapy_read_var (PyObject *self, PyObject *args)
}
GDB_PY_HANDLE_EXCEPTION (except);
if (!val)
{
PyErr_Format (PyExc_ValueError,
_("Variable cannot be found for symbol '%s'."),
SYMBOL_NATURAL_NAME (var));
return NULL;
}
return value_to_value_object (val);
}

37
gdb/stack.c
View file

@ -330,6 +330,9 @@ print_frame_args (struct symbol *func, struct frame_info *frame,
TRY_CATCH (except, RETURN_MASK_ERROR)
{
const struct language_defn *language;
struct value_print_options opts;
/* Avoid value_print because it will deref ref parameters.
We just want to print their addresses. Print ??? for
args whose address we do not know. We pass 2 as
@ -338,29 +341,21 @@ print_frame_args (struct symbol *func, struct frame_info *frame,
recurse. */
val = read_var_value (sym, frame);
annotate_arg_value (val == NULL ? NULL : value_type (val));
annotate_arg_value (value_type (val));
if (val)
{
const struct language_defn *language;
struct value_print_options opts;
/* Use the appropriate language to display our symbol,
unless the user forced the language to a specific
language. */
if (language_mode == language_mode_auto)
language = language_def (SYMBOL_LANGUAGE (sym));
else
language = current_language;
get_raw_print_options (&opts);
opts.deref_ref = 0;
opts.summary = summary;
common_val_print (val, stb->stream, 2, &opts, language);
ui_out_field_stream (uiout, "value", stb);
}
/* Use the appropriate language to display our symbol,
unless the user forced the language to a specific
language. */
if (language_mode == language_mode_auto)
language = language_def (SYMBOL_LANGUAGE (sym));
else
ui_out_text (uiout, "???");
language = current_language;
get_raw_print_options (&opts);
opts.deref_ref = 0;
opts.summary = summary;
common_val_print (val, stb->stream, 2, &opts, language);
ui_out_field_stream (uiout, "value", stb);
}
if (except.reason < 0)
{

7
gdb/valops.c
View file

@ -1488,7 +1488,6 @@ value_repeat (struct value *arg1, int count)
struct value *
value_of_variable (struct symbol *var, struct block *b)
{
struct value *val;
struct frame_info *frame;
if (!symbol_read_needs_frame (var))
@ -1509,11 +1508,7 @@ value_of_variable (struct symbol *var, struct block *b)
}
}
val = read_var_value (var, frame);
if (!val)
error (_("Address of symbol \"%s\" is unknown."), SYMBOL_PRINT_NAME (var));
return val;
return read_var_value (var, frame);
}
struct value *