vla: enable sizeof operator for indirection

This patch enables the sizeof operator for indirections:

1| void foo (size_t n) {
2|   int vla[n];
3|   int *vla_ptr = &vla;
4| }

(gdb) p sizeof(*vla_ptr)

yields sizeof (size_t) * n.

gdb/ChangeLog:

	* eval.c (evaluate_subexp_for_sizeof) <UNOP_IND>: Create an indirect
	value and retrieve the dynamic type size.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1755609..c7efe62 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2014-04-14  Sanimir Agovic  <sanimir.agovic@intel.com>
 
+       * eval.c (evaluate_subexp_for_sizeof) <UNOP_IND>: Create an indirect
+       value and retrieve the dynamic type size.
+
+2014-04-14  Sanimir Agovic  <sanimir.agovic@intel.com>
+
        * eval.c (evaluate_subexp_for_sizeof) <OP_VAR_VALUE>: If the type
        passed to sizeof is dynamic evaluate the argument to compute the length.
 

diff --git a/gdb/eval.c b/gdb/eval.c
index 85523cd..22392eb 100644 (file)
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -3026,7 +3026,9 @@ evaluate_subexp_for_sizeof (struct expression *exp, int *pos)
          && TYPE_CODE (type) != TYPE_CODE_ARRAY)
        error (_("Attempt to take contents of a non-pointer value."));
       type = TYPE_TARGET_TYPE (type);
-      break;
+      if (is_dynamic_type (type))
+       type = value_type (value_ind (val));
+      return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type));
 
     case UNOP_MEMVAL:
       (*pos) += 3;