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* stabsread.c: Ensure that all members of all allocated structures 

are initialized to known state to avoid hard to find bugs with gdb
	using fields containing random data.
This commit is contained in:
Fred Fish 1992-08-06 21:44:36 +00:00
parent 5acafc2fd9
commit c02a37ea00
2 changed files with 35 additions and 32 deletions
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3
gdb/ChangeLog
View File

@ -1,5 +1,8 @@
Thu Aug 6 10:56:01 1992 Fred Fish (fnf@cygnus.com)
* stabsread.c: Ensure that all members of all allocated structures
are initialized to known state to avoid hard to find bugs with gdb
using fields containing random data.
* buildsym.c (start_subfile): Compact dirname initialization.
* buildsym.c (patch_subfile_names): New function.
* buildsym.c (end_symtab): Make copy of dirname on symbol obstack.

64
gdb/stabsread.c
View File

@ -390,6 +390,7 @@ define_symbol (valu, string, desc, type, objfile)
sym = (struct symbol *)
obstack_alloc (&objfile -> symbol_obstack, sizeof (struct symbol));
memset (sym, 0, sizeof (struct symbol));
if (processing_gcc_compilation)
{
@ -490,8 +491,7 @@ define_symbol (valu, string, desc, type, objfile)
SYMBOL_TYPE (sym) = lookup_fundamental_type (objfile,
FT_DBL_PREC_FLOAT);
dbl_valu = (char *)
obstack_alloc (&objfile -> type_obstack,
sizeof (double));
obstack_alloc (&objfile -> type_obstack, sizeof (double));
memcpy (dbl_valu, &d, sizeof (double));
SWAP_TARGET_AND_HOST (dbl_valu, sizeof (double));
SYMBOL_VALUE_BYTES (sym) = dbl_valu;
@ -603,8 +603,7 @@ define_symbol (valu, string, desc, type, objfile)
/* This code doesn't work -- it needs to realloc and can't. */
/* Attempt to set up to record a function prototype... */
struct type *new = (struct type *)
obstack_alloc (&objfile -> type_obstack,
sizeof (struct type));
obstack_alloc (&objfile -> type_obstack, sizeof (struct type));
/* Generate a template for the type of this function. The
types of the arguments will be added as we read the symbol
@ -831,8 +830,8 @@ define_symbol (valu, string, desc, type, objfile)
if (synonym)
{
register struct symbol *typedef_sym = (struct symbol *)
obstack_alloc (&objfile -> type_obstack,
sizeof (struct symbol));
obstack_alloc (&objfile -> type_obstack, sizeof (struct symbol));
memset (typedef_sym, 0, sizeof (struct symbol));
SYMBOL_NAME (typedef_sym) = SYMBOL_NAME (sym);
SYMBOL_TYPE (typedef_sym) = SYMBOL_TYPE (sym);
@ -1351,9 +1350,8 @@ read_struct_type (pp, type, objfile)
ALLOCATE_CPLUS_STRUCT_TYPE(type);
n_baseclasses = read_number (pp, ',');
TYPE_FIELD_VIRTUAL_BITS (type) =
(B_TYPE *) obstack_alloc (&objfile -> type_obstack,
B_BYTES (n_baseclasses));
TYPE_FIELD_VIRTUAL_BITS (type) = (B_TYPE *)
obstack_alloc (&objfile -> type_obstack, B_BYTES (n_baseclasses));
B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), n_baseclasses);
for (i = 0; i < n_baseclasses; i++)
@ -1622,19 +1620,18 @@ read_struct_type (pp, type, objfile)
TYPE_NFIELDS (type) = nfields;
TYPE_FIELDS (type) = (struct field *)
obstack_alloc (&objfile -> type_obstack, sizeof (struct field) * nfields);
memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
if (non_public_fields)
{
ALLOCATE_CPLUS_STRUCT_TYPE (type);
TYPE_FIELD_PRIVATE_BITS (type) =
(B_TYPE *) obstack_alloc (&objfile -> type_obstack,
B_BYTES (nfields));
TYPE_FIELD_PRIVATE_BITS (type) = (B_TYPE *)
obstack_alloc (&objfile -> type_obstack, B_BYTES (nfields));
B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
TYPE_FIELD_PROTECTED_BITS (type) =
(B_TYPE *) obstack_alloc (&objfile -> type_obstack,
B_BYTES (nfields));
TYPE_FIELD_PROTECTED_BITS (type) = (B_TYPE *)
obstack_alloc (&objfile -> type_obstack, B_BYTES (nfields));
B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
}
@ -1858,9 +1855,11 @@ read_struct_type (pp, type, objfile)
*pp += 1;
new_mainlist->fn_fieldlist.fn_fields =
(struct fn_field *) obstack_alloc (&objfile -> type_obstack,
sizeof (struct fn_field) * length);
new_mainlist->fn_fieldlist.fn_fields = (struct fn_field *)
obstack_alloc (&objfile -> type_obstack,
sizeof (struct fn_field) * length);
memset (new_mainlist->fn_fieldlist.fn_fields, 0,
sizeof (struct fn_field) * length);
for (i = length; (i--, sublist); sublist = sublist->next)
new_mainlist->fn_fieldlist.fn_fields[i] = sublist->fn_field;
@ -1882,6 +1881,8 @@ read_struct_type (pp, type, objfile)
TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
obstack_alloc (&objfile -> type_obstack,
sizeof (struct fn_fieldlist) * nfn_fields);
memset (TYPE_FN_FIELDLISTS (type), 0,
sizeof (struct fn_fieldlist) * nfn_fields);
TYPE_NFN_FIELDS (type) = nfn_fields;
TYPE_NFN_FIELDS_TOTAL (type) = total_length;
}
@ -2069,9 +2070,9 @@ read_array_type (pp, type, objfile)
TYPE_LENGTH (range_type) = sizeof (int);
TYPE_NFIELDS (range_type) = 2;
TYPE_FIELDS (range_type) =
(struct field *) obstack_alloc (&objfile -> type_obstack,
2 * sizeof (struct field));
TYPE_FIELDS (range_type) = (struct field *)
obstack_alloc (&objfile -> type_obstack, 2 * sizeof (struct field));
memset (TYPE_FIELDS (range_type), 0, 2 * sizeof (struct field));
TYPE_FIELD_BITPOS (range_type, 0) = lower;
TYPE_FIELD_BITPOS (range_type, 1) = upper;
}
@ -2080,9 +2081,9 @@ read_array_type (pp, type, objfile)
TYPE_TARGET_TYPE (type) = element_type;
TYPE_LENGTH (type) = (upper - lower + 1) * TYPE_LENGTH (element_type);
TYPE_NFIELDS (type) = 1;
TYPE_FIELDS (type) =
(struct field *) obstack_alloc (&objfile -> type_obstack,
sizeof (struct field));
TYPE_FIELDS (type) = (struct field *)
obstack_alloc (&objfile -> type_obstack, sizeof (struct field));
memset (TYPE_FIELDS (type), 0, sizeof (struct field));
TYPE_FIELD_TYPE (type, 0) = range_type;
/* If we have an array whose element type is not yet known, but whose
@ -2139,7 +2140,8 @@ read_enum_type (pp, type, objfile)
*pp = p + 1;
n = read_number (pp, ',');
sym = (struct symbol *) obstack_alloc (&objfile -> symbol_obstack, sizeof (struct symbol));
sym = (struct symbol *)
obstack_alloc (&objfile -> symbol_obstack, sizeof (struct symbol));
memset (sym, 0, sizeof (struct symbol));
SYMBOL_NAME (sym) = name;
SYMBOL_CLASS (sym) = LOC_CONST;
@ -2159,8 +2161,8 @@ read_enum_type (pp, type, objfile)
TYPE_FLAGS (type) &= ~TYPE_FLAG_STUB;
TYPE_NFIELDS (type) = nsyms;
TYPE_FIELDS (type) = (struct field *)
obstack_alloc (&objfile -> type_obstack,
sizeof (struct field) * nsyms);
obstack_alloc (&objfile -> type_obstack, sizeof (struct field) * nsyms);
memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nsyms);
/* Find the symbols for the values and put them into the type.
The symbols can be found in the symlist that we put them on
@ -2504,8 +2506,7 @@ read_range_type (pp, typenums, objfile)
if (got_signed || got_unsigned)
{
result_type = (struct type *)
obstack_alloc (&objfile -> type_obstack,
sizeof (struct type));
obstack_alloc (&objfile -> type_obstack, sizeof (struct type));
memset (result_type, 0, sizeof (struct type));
TYPE_OBJFILE (result_type) = objfile;
TYPE_LENGTH (result_type) = nbits / TARGET_CHAR_BIT;
@ -2630,9 +2631,8 @@ read_range_type (pp, typenums, objfile)
}
TYPE_NFIELDS (result_type) = 2;
TYPE_FIELDS (result_type) =
(struct field *) obstack_alloc (&objfile -> type_obstack,
2 * sizeof (struct field));
TYPE_FIELDS (result_type) = (struct field *)
obstack_alloc (&objfile -> type_obstack, 2 * sizeof (struct field));
memset (TYPE_FIELDS (result_type), 0, 2 * sizeof (struct field));
TYPE_FIELD_BITPOS (result_type, 0) = n2;
TYPE_FIELD_BITPOS (result_type, 1) = n3;