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Warn (via -Wextensions) when accessing a field-of-array's element without putting the indexed field name in parenthesis

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This commit is contained in:
Wolfgang (Blub) Bumiller 2012-11-13 14:43:20 +01:00
parent b0326c66ed
commit b1175eabfc
1 changed files with 14 additions and 5 deletions
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19
parser.c
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@ -383,7 +383,7 @@ static sy_elem syparen(lex_ctx ctx, int p, size_t off) {
/* With regular precedence rules, ent.foo[n] is the same as (ent.foo)[n],
* so we need to rotate it to become ent.(foo[n]).
*/
static void rotate_entfield_array_index_nodes(ast_expression **out)
static bool rotate_entfield_array_index_nodes(ast_expression **out)
{
ast_array_index *index;
ast_entfield *entfield;
@ -395,15 +395,15 @@ static void rotate_entfield_array_index_nodes(ast_expression **out)
lex_ctx ctx = ast_ctx(*out);
if (!ast_istype(*out, ast_array_index))
return;
return false;
index = (ast_array_index*)*out;
if (!ast_istype(index->array, ast_entfield))
return;
return false;
entfield = (ast_entfield*)index->array;
if (!ast_istype(entfield->field, ast_value))
return;
return false;
field = (ast_value*)entfield->field;
sub = index->index;
@ -414,6 +414,8 @@ static void rotate_entfield_array_index_nodes(ast_expression **out)
index = ast_array_index_new(ctx, (ast_expression*)field, sub);
entfield = ast_entfield_new(ctx, entity, (ast_expression*)index);
*out = (ast_expression*)entfield;
return true;
}
static bool parser_sy_pop(parser_t *parser, shunt *sy)
@ -514,7 +516,14 @@ static bool parser_sy_pop(parser_t *parser, shunt *sy)
return false;
}
out = (ast_expression*)ast_array_index_new(ctx, exprs[0], exprs[1]);
rotate_entfield_array_index_nodes(&out);
if (rotate_entfield_array_index_nodes(&out))
{
if (opts_standard != COMPILER_GMQCC) {
/* this error doesn't need to make us bail out */
(void)!parsewarning(parser, WARN_EXTENSIONS,
"accessing array-field members of an entity without parenthesis");
}
}
break;
case opid1(','):