diff options
Diffstat (limited to 'gcc/tree-ssa-alias.c')
| -rw-r--r-- | gcc/tree-ssa-alias.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index 18b519b0328..abcf629af8a 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -2853,6 +2853,39 @@ found_tag: } +/* Create a type tag for PTR. Construct the may-alias list of this type tag + so that it has the aliasing of VAR. */ + +void +new_type_alias (tree ptr, tree var) +{ + var_ann_t p_ann = var_ann (ptr); + tree tag_type = TREE_TYPE (TREE_TYPE (ptr)); + var_ann_t v_ann = var_ann (var); + tree tag; + subvar_t svars; + + gcc_assert (p_ann->type_mem_tag == NULL_TREE); + gcc_assert (v_ann->mem_tag_kind == NOT_A_TAG); + tag = create_memory_tag (tag_type, true); + p_ann->type_mem_tag = tag; + + /* Add VAR to the may-alias set of PTR's new type tag. If VAR has + subvars, add the subvars to the tag instead of the actual var. */ + if (var_can_have_subvars (var) + && (svars = get_subvars_for_var (var))) + { + subvar_t sv; + for (sv = svars; sv; sv = sv->next) + add_may_alias (tag, sv->var); + } + else + add_may_alias (tag, var); + + /* Note, TAG and its set of aliases are not marked for renaming. */ +} + + /* This structure is simply used during pushing fields onto the fieldstack to track the offset of the field, since bitpos_of_field gives it relative to its immediate containing type, and we want it relative to the ultimate |