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Diffstat (limited to 'lib/compiler/src/erl_bifs.erl')
| -rw-r--r-- | lib/compiler/src/erl_bifs.erl | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/lib/compiler/src/erl_bifs.erl b/lib/compiler/src/erl_bifs.erl new file mode 100644 index 0000000000..e87bb276de --- /dev/null +++ b/lib/compiler/src/erl_bifs.erl @@ -0,0 +1,217 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2001-2009. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% +%% Purpose: Information about the Erlang built-in functions. + +-module(erl_bifs). + +-export([is_pure/3, is_safe/3, is_exit_bif/3]). + +%% ===================================================================== +%% is_pure(Module, Name, Arity) -> boolean() +%% +%% Module = Name = atom() +%% Arity = integer() +%% +%% Returns `true' if the function `Module:Name/Arity' does not +%% affect the state, nor depend on the state, although its +%% evaluation is not guaranteed to complete normally for all input. + +-spec is_pure(atom(), atom(), arity()) -> boolean(). + +is_pure(erlang, '*', 2) -> true; +is_pure(erlang, '+', 1) -> true; % (even for non-numbers) +is_pure(erlang, '+', 2) -> true; +is_pure(erlang, '++', 2) -> true; +is_pure(erlang, '-', 1) -> true; +is_pure(erlang, '-', 2) -> true; +is_pure(erlang, '--', 2) -> true; +is_pure(erlang, '/', 2) -> true; +is_pure(erlang, '/=', 2) -> true; +is_pure(erlang, '<', 2) -> true; +is_pure(erlang, '=/=', 2) -> true; +is_pure(erlang, '=:=', 2) -> true; +is_pure(erlang, '=<', 2) -> true; +is_pure(erlang, '==', 2) -> true; +is_pure(erlang, '>', 2) -> true; +is_pure(erlang, '>=', 2) -> true; +is_pure(erlang, 'and', 2) -> true; +is_pure(erlang, 'band', 2) -> true; +is_pure(erlang, 'bnot', 1) -> true; +is_pure(erlang, 'bor', 2) -> true; +is_pure(erlang, 'bsl', 2) -> true; +is_pure(erlang, 'bsr', 2) -> true; +is_pure(erlang, 'bxor', 2) -> true; +is_pure(erlang, 'div', 2) -> true; +is_pure(erlang, 'not', 1) -> true; +is_pure(erlang, 'or', 2) -> true; +is_pure(erlang, 'rem', 2) -> true; +is_pure(erlang, 'xor', 2) -> true; +is_pure(erlang, abs, 1) -> true; +is_pure(erlang, atom_to_binary, 2) -> true; +is_pure(erlang, atom_to_list, 1) -> true; +is_pure(erlang, binary_to_atom, 2) -> true; +is_pure(erlang, binary_to_list, 1) -> true; +is_pure(erlang, binary_to_list, 3) -> true; +is_pure(erlang, bit_size, 1) -> true; +is_pure(erlang, byte_size, 1) -> true; +is_pure(erlang, concat_binary, 1) -> true; +is_pure(erlang, element, 2) -> true; +is_pure(erlang, float, 1) -> true; +is_pure(erlang, float_to_list, 1) -> true; +is_pure(erlang, hash, 2) -> false; +is_pure(erlang, hd, 1) -> true; +is_pure(erlang, integer_to_list, 1) -> true; +is_pure(erlang, is_atom, 1) -> true; +is_pure(erlang, is_boolean, 1) -> true; +is_pure(erlang, is_binary, 1) -> true; +is_pure(erlang, is_bitstring, 1) -> true; +%% erlang:is_builtin/3 depends on the state (i.e. the version of the emulator). +is_pure(erlang, is_float, 1) -> true; +is_pure(erlang, is_function, 1) -> true; +is_pure(erlang, is_integer, 1) -> true; +is_pure(erlang, is_list, 1) -> true; +is_pure(erlang, is_number, 1) -> true; +is_pure(erlang, is_pid, 1) -> true; +is_pure(erlang, is_port, 1) -> true; +is_pure(erlang, is_record, 2) -> true; +is_pure(erlang, is_record, 3) -> true; +is_pure(erlang, is_reference, 1) -> true; +is_pure(erlang, is_tuple, 1) -> true; +is_pure(erlang, length, 1) -> true; +is_pure(erlang, list_to_atom, 1) -> true; +is_pure(erlang, list_to_binary, 1) -> true; +is_pure(erlang, list_to_float, 1) -> true; +is_pure(erlang, list_to_integer, 1) -> true; +is_pure(erlang, list_to_pid, 1) -> true; +is_pure(erlang, list_to_tuple, 1) -> true; +is_pure(erlang, max, 2) -> true; +is_pure(erlang, min, 2) -> true; +is_pure(erlang, phash, 2) -> false; +is_pure(erlang, pid_to_list, 1) -> true; +is_pure(erlang, round, 1) -> true; +is_pure(erlang, setelement, 3) -> true; +is_pure(erlang, size, 1) -> true; +is_pure(erlang, split_binary, 2) -> true; +is_pure(erlang, term_to_binary, 1) -> true; +is_pure(erlang, tl, 1) -> true; +is_pure(erlang, trunc, 1) -> true; +is_pure(erlang, tuple_size, 1) -> true; +is_pure(erlang, tuple_to_list, 1) -> true; +is_pure(lists, append, 2) -> true; +is_pure(lists, subtract, 2) -> true; +is_pure(math, acos, 1) -> true; +is_pure(math, acosh, 1) -> true; +is_pure(math, asin, 1) -> true; +is_pure(math, asinh, 1) -> true; +is_pure(math, atan, 1) -> true; +is_pure(math, atan2, 2) -> true; +is_pure(math, atanh, 1) -> true; +is_pure(math, cos, 1) -> true; +is_pure(math, cosh, 1) -> true; +is_pure(math, erf, 1) -> true; +is_pure(math, erfc, 1) -> true; +is_pure(math, exp, 1) -> true; +is_pure(math, log, 1) -> true; +is_pure(math, log10, 1) -> true; +is_pure(math, pow, 2) -> true; +is_pure(math, sin, 1) -> true; +is_pure(math, sinh, 1) -> true; +is_pure(math, sqrt, 1) -> true; +is_pure(math, tan, 1) -> true; +is_pure(math, tanh, 1) -> true; +is_pure(_, _, _) -> false. + + +%% ===================================================================== +%% is_safe(Module, Name, Arity) -> boolean() +%% +%% Module = Name = atom() +%% Arity = integer() +%% +%% Returns `true' if the function `Module:Name/Arity' is completely +%% effect free, i.e., if its evaluation always completes normally +%% and does not affect the state (although the value it returns +%% might depend on the state). +%% +%% Note: is_function/2 and is_record/3 are NOT safe: is_function(X, foo) +%% and is_record(X, foo, bar) will fail. + +-spec is_safe(atom(), atom(), arity()) -> boolean(). + +is_safe(erlang, '/=', 2) -> true; +is_safe(erlang, '<', 2) -> true; +is_safe(erlang, '=/=', 2) -> true; +is_safe(erlang, '=:=', 2) -> true; +is_safe(erlang, '=<', 2) -> true; +is_safe(erlang, '==', 2) -> true; +is_safe(erlang, '>', 2) -> true; +is_safe(erlang, '>=', 2) -> true; +is_safe(erlang, date, 0) -> true; +is_safe(erlang, get, 0) -> true; +is_safe(erlang, get, 1) -> true; +is_safe(erlang, get_cookie, 0) -> true; +is_safe(erlang, get_keys, 1) -> true; +is_safe(erlang, group_leader, 0) -> true; +is_safe(erlang, is_alive, 0) -> true; +is_safe(erlang, is_atom, 1) -> true; +is_safe(erlang, is_boolean, 1) -> true; +is_safe(erlang, is_binary, 1) -> true; +is_safe(erlang, is_bitstring, 1) -> true; +is_safe(erlang, is_float, 1) -> true; +is_safe(erlang, is_function, 1) -> true; +is_safe(erlang, is_integer, 1) -> true; +is_safe(erlang, is_list, 1) -> true; +is_safe(erlang, is_number, 1) -> true; +is_safe(erlang, is_pid, 1) -> true; +is_safe(erlang, is_port, 1) -> true; +is_safe(erlang, is_reference, 1) -> true; +is_safe(erlang, is_tuple, 1) -> true; +is_safe(erlang, make_ref, 0) -> true; +is_safe(erlang, max, 2) -> true; +is_safe(erlang, min, 2) -> true; +is_safe(erlang, node, 0) -> true; +is_safe(erlang, nodes, 0) -> true; +is_safe(erlang, ports, 0) -> true; +is_safe(erlang, pre_loaded, 0) -> true; +is_safe(erlang, processes, 0) -> true; +is_safe(erlang, registered, 0) -> true; +is_safe(erlang, self, 0) -> true; +is_safe(erlang, term_to_binary, 1) -> true; +is_safe(erlang, time, 0) -> true; +is_safe(error_logger, warning_map, 0) -> true; +is_safe(_, _, _) -> false. + + +%% ===================================================================== +%% is_exit_bif(Module, Name, Arity) -> boolean() +%% +%% Module = Name = atom() +%% Arity = integer() +%% +%% Returns `true' if the function `Module:Name/Arity' never returns +%% normally, i.e., if it always causes an exception regardless of +%% its arguments. + +-spec is_exit_bif(atom(), atom(), arity()) -> boolean(). + +is_exit_bif(erlang, exit, 1) -> true; +is_exit_bif(erlang, throw, 1) -> true; +is_exit_bif(erlang, error, 1) -> true; +is_exit_bif(erlang, error, 2) -> true; +is_exit_bif(_, _, _) -> false. |