diff options
Diffstat (limited to 'gcc/gengtype.c')
| -rw-r--r-- | gcc/gengtype.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/gcc/gengtype.c b/gcc/gengtype.c index 95e2a92..85832d3 100644 --- a/gcc/gengtype.c +++ b/gcc/gengtype.c @@ -2386,6 +2386,7 @@ walk_type (type_p t, struct walk_type_data *d) int maybe_undef_p = 0; int use_param_num = -1; int use_params_p = 0; + int atomic_p = 0; options_p oo; const struct nested_ptr_data *nested_ptr_d = NULL; @@ -2415,6 +2416,8 @@ walk_type (type_p t, struct walk_type_data *d) ; else if (strcmp (oo->name, "skip") == 0) ; + else if (strcmp (oo->name, "atomic") == 0) + atomic_p = 1; else if (strcmp (oo->name, "default") == 0) ; else if (strcmp (oo->name, "param_is") == 0) @@ -2480,6 +2483,12 @@ walk_type (type_p t, struct walk_type_data *d) return; } + if (atomic_p && (t->kind != TYPE_POINTER)) + { + error_at_line (d->line, "field `%s' has invalid option `atomic'\n", d->val); + return; + } + switch (t->kind) { case TYPE_SCALAR: @@ -2495,6 +2504,25 @@ walk_type (type_p t, struct walk_type_data *d) break; } + /* If a pointer type is marked as "atomic", we process the + field itself, but we don't walk the data that they point to. + + There are two main cases where we walk types: to mark + pointers that are reachable, and to relocate pointers when + writing a PCH file. In both cases, an atomic pointer is + itself marked or relocated, but the memory that it points + to is left untouched. In the case of PCH, that memory will + be read/written unchanged to the PCH file. */ + if (atomic_p) + { + oprintf (d->of, "%*sif (%s != NULL) {\n", d->indent, "", d->val); + d->indent += 2; + d->process_field (t, d); + d->indent -= 2; + oprintf (d->of, "%*s}\n", d->indent, ""); + break; + } + if (!length) { if (!UNION_OR_STRUCT_P (t->u.p) |