diff options
Diffstat (limited to 'gcc/fortran/trans-expr.c')
| -rw-r--r-- | gcc/fortran/trans-expr.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/gcc/fortran/trans-expr.c b/gcc/fortran/trans-expr.c index 4baadc84ef0..8d039a670b5 100644 --- a/gcc/fortran/trans-expr.c +++ b/gcc/fortran/trans-expr.c @@ -173,6 +173,29 @@ gfc_class_len_get (tree decl) } +/* Try to get the _len component of a class. When the class is not unlimited + poly, i.e. no _len field exists, then return a zero node. */ + +tree +gfc_class_len_or_zero_get (tree decl) +{ + tree len; + /* For class arrays decl may be a temporary descriptor handle, the vptr is + then available through the saved descriptor. */ + if (TREE_CODE (decl) == VAR_DECL && DECL_LANG_SPECIFIC (decl) + && GFC_DECL_SAVED_DESCRIPTOR (decl)) + decl = GFC_DECL_SAVED_DESCRIPTOR (decl); + if (POINTER_TYPE_P (TREE_TYPE (decl))) + decl = build_fold_indirect_ref_loc (input_location, decl); + len = gfc_advance_chain (TYPE_FIELDS (TREE_TYPE (decl)), + CLASS_LEN_FIELD); + return len != NULL_TREE ? fold_build3_loc (input_location, COMPONENT_REF, + TREE_TYPE (len), decl, len, + NULL_TREE) + : integer_zero_node; +} + + /* Get the specified FIELD from the VPTR. */ static tree @@ -250,6 +273,7 @@ gfc_vptr_size_get (tree vptr) #undef CLASS_DATA_FIELD #undef CLASS_VPTR_FIELD +#undef CLASS_LEN_FIELD #undef VTABLE_HASH_FIELD #undef VTABLE_SIZE_FIELD #undef VTABLE_EXTENDS_FIELD @@ -1120,7 +1144,7 @@ gfc_copy_class_to_class (tree from, tree to, tree nelems, bool unlimited) if (unlimited) { if (from != NULL_TREE && unlimited) - from_len = gfc_class_len_get (from); + from_len = gfc_class_len_or_zero_get (from); else from_len = integer_zero_node; } |