diff options
Diffstat (limited to 'gcc/c/c-convert.cc')
| -rw-r--r-- | gcc/c/c-convert.cc | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/gcc/c/c-convert.cc b/gcc/c/c-convert.cc index 18083d5..6e74913 100644 --- a/gcc/c/c-convert.cc +++ b/gcc/c/c-convert.cc @@ -133,6 +133,20 @@ c_convert (tree type, tree expr, bool init_const) (loc, type, c_objc_common_truthvalue_conversion (input_location, expr)); case POINTER_TYPE: + /* The type nullptr_t may be converted to a pointer type. The result is + a null pointer value. */ + if (NULLPTR_TYPE_P (TREE_TYPE (e))) + { + /* To make sure that (void *)nullptr is not a null pointer constant, + build_c_cast will create an additional NOP_EXPR around the result + of this conversion. */ + if (TREE_SIDE_EFFECTS (e)) + ret = build2 (COMPOUND_EXPR, type, e, build_int_cst (type, 0)); + else + ret = build_int_cst (type, 0); + goto maybe_fold; + } + gcc_fallthrough (); case REFERENCE_TYPE: ret = convert_to_pointer (type, e); goto maybe_fold; @@ -180,7 +194,16 @@ c_convert (tree type, tree expr, bool init_const) return ret; } - error ("conversion to non-scalar type requested"); + /* If we are converting to nullptr_t, don't say "non-scalar type" because + the nullptr_t type is a scalar type. Only nullptr_t shall be converted + to nullptr_t. */ + if (code == NULLPTR_TYPE) + { + error ("conversion from %qT to %qT", TREE_TYPE (e), type); + inform (input_location, "only %qT can be converted to %qT", type, type); + } + else + error ("conversion to non-scalar type requested"); return error_mark_node; } |