File 2209-epp-Add-the-error-and-warning-directives.patch of Package erlang
From 14d72f02146b1d0aa3293eef9a823cbf0f4a4e99 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Thu, 1 Oct 2015 15:41:01 +0200
Subject: [PATCH 2/3] epp: Add the -error and -warning directives
If one of several alternatives configurations are required for
an Erlang module to compile, but none are available, it would
be useful to give a nice error message. For example:
-ifdef(CONFIG_A).
%% Some code if A is true.
-else.
-ifdef(CONFIG_B).
%% Some code if B is true.
-else.
-error("Neither CONFIG_A nor CONFIG_B are available").
-endif.
-endif.
If neither CONFIG_A nor CONFIG_B are defined, the error message
will be:
module.erl:10: -error("Neither CONFIG_A nor CONFIG_B are available").
That is basically the same behavior as for the #error directive in
GCC.
For symmetry with the -error directive, add the -warning
directive to generate a compiler warning. For example:
-ifdef(HAVE_COOL_FEATURE).
%% Code if we have Cool Feature.
-else.
%% Inefficient fallback code.
-warning("Using inefficient fallback").
-endif.
If HAVE_COOL_FEATURE is not defined, the warning message will
be:
module.erl:8: Warning: -warning("Using inefficient fallback").
That is basically the same behavior as for the #warning directive
in GCC.
Conflicts:
lib/stdlib/src/epp.erl
lib/stdlib/test/epp_SUITE.erl
---
lib/stdlib/src/epp.erl | 42 ++++++++++++++++++++++++++---
lib/stdlib/test/epp_SUITE.erl | 63 +++++++++++++++++++++++++++++++++++++++++--
2 files changed, 99 insertions(+), 6 deletions(-)
diff --git a/lib/stdlib/src/epp.erl b/lib/stdlib/src/epp.erl
index 71c465d..73934e0 100644
--- a/lib/stdlib/src/epp.erl
+++ b/lib/stdlib/src/epp.erl
@@ -53,6 +53,8 @@
| {atom(),non_neg_integer()}
| tokens().
+-type warning_info() :: {erl_anno:location(), module(), term()}.
+
-define(DEFAULT_ENCODING, utf8).
%% Epp state record.
@@ -158,11 +160,13 @@ scan_erl_form(Epp) ->
epp_request(Epp, scan_erl_form).
-spec parse_erl_form(Epp) ->
- {'ok', AbsForm} | {'eof', Line} | {error, ErrorInfo} when
+ {'ok', AbsForm} | {error, ErrorInfo} |
+ {'warning',WarningInfo} | {'eof',Line} when
Epp :: epp_handle(),
AbsForm :: erl_parse:abstract_form(),
Line :: erl_anno:line(),
- ErrorInfo :: erl_scan:error_info() | erl_parse:error_info().
+ ErrorInfo :: erl_scan:error_info() | erl_parse:error_info(),
+ WarningInfo :: warning_info().
parse_erl_form(Epp) ->
case epp_request(Epp, scan_erl_form) of
@@ -219,6 +223,10 @@ format_error({illegal_function_usage,Macro}) ->
io_lib:format("?~s must not begin a form", [Macro]);
format_error({'NYI',What}) ->
io_lib:format("not yet implemented '~s'", [What]);
+format_error({error,Term}) ->
+ io_lib:format("-error(~p).", [Term]);
+format_error({warning,Term}) ->
+ io_lib:format("-warning(~p).", [Term]);
format_error(E) -> file:format_error(E).
-spec parse_file(FileName, IncludePath, PredefMacros) ->
@@ -263,9 +271,11 @@ parse_file(Ifile, Options) ->
-spec parse_file(Epp) -> [Form] when
Epp :: epp_handle(),
- Form :: erl_parse:abstract_form() | {'error', ErrorInfo} | {'eof',Line},
+ Form :: erl_parse:abstract_form() | {'error', ErrorInfo} |
+ {'warning',WarningInfo} | {'eof',Line},
Line :: erl_anno:line(),
- ErrorInfo :: erl_scan:error_info() | erl_parse:error_info().
+ ErrorInfo :: erl_scan:error_info() | erl_parse:error_info(),
+ WarningInfo :: warning_info().
parse_file(Epp) ->
case parse_erl_form(Epp) of
@@ -273,6 +283,8 @@ parse_file(Epp) ->
end;
{error,E} ->
[{error,E}|parse_file(Epp)];
+ {warning,W} ->
+ [{warning,W}|parse_file(Epp)];
{eof,Location} ->
[{eof,erl_anno:new(Location)}]
end.
@@ -752,6 +764,10 @@ scan_toks([{'-',_Lh},{atom,_Ld,define}=Define|Toks], From, St) ->
scan_define(Toks, Define, From, St);
scan_toks([{'-',_Lh},{atom,_Ld,undef}=Undef|Toks], From, St) ->
scan_undef(Toks, Undef, From, St);
+scan_toks([{'-',_Lh},{atom,_Ld,error}=Error|Toks], From, St) ->
+ scan_err_warn(Toks, Error, From, St);
+scan_toks([{'-',_Lh},{atom,_Ld,warning}=Warn|Toks], From, St) ->
+ scan_err_warn(Toks, Warn, From, St);
scan_toks([{'-',_Lh},{atom,_Li,include}=Inc|Toks], From, St) ->
scan_include(Toks, Inc, From, St);
scan_toks([{'-',_Lh},{atom,_Li,include_lib}=IncLib|Toks], From, St) ->
@@ -807,6 +823,24 @@ scan_extends([{atom,Ln,A}=ModAtom,{')',_Lr}|_Ts], Ms0) ->
Ms#{'BASE_MODULE_STRING':={none,[{string,Ln,ModString}]}};
scan_extends(_Ts, Ms) -> Ms.
+scan_err_warn([{'(',_}|_]=Toks0, {atom,_,Tag}=Token, From, St) ->
+ try expand_macros(Toks0, St) of
+ Toks when is_list(Toks) ->
+ case erl_parse:parse_term(Toks) of
+ {ok,Term} ->
+ epp_reply(From, {Tag,{loc(Token),epp,{Tag,Term}}});
+ {error,_} ->
+ epp_reply(From, {error,{loc(Token),epp,{bad,Tag}}})
+ end
+ catch
+ _:_ ->
+ epp_reply(From, {error,{loc(Token),epp,{bad,Tag}}})
+ end,
+ wait_req_scan(St);
+scan_err_warn(_Toks, {atom,_,Tag}=Token, From, St) ->
+ epp_reply(From, {error,{loc(Token),epp,{bad,Tag}}}),
+ wait_req_scan(St).
+
%% scan_define(Tokens, DefineToken, From, EppState)
scan_define([{'(',_Lp},{Type,_Lm,_}=Mac|Toks], Def, From, St)
diff --git a/lib/stdlib/test/epp_SUITE.erl b/lib/stdlib/test/epp_SUITE.erl
index ef2c912..4078513 100644
--- a/lib/stdlib/test/epp_SUITE.erl
+++ b/lib/stdlib/test/epp_SUITE.erl
@@ -27,7 +27,8 @@
pmod/1, not_circular/1, skip_header/1, otp_6277/1, otp_7702/1,
otp_8130/1, overload_mac/1, otp_8388/1, otp_8470/1, otp_8503/1,
otp_8562/1, otp_8665/1, otp_8911/1, otp_10302/1, otp_10820/1,
- otp_11728/1, encoding/1, function_macro/1]).
+ otp_11728/1, encoding/1, function_macro/1,
+ test_error/1, test_warning/1]).
-export([epp_parse_erl_form/2]).
@@ -67,7 +68,7 @@ all() ->
not_circular, skip_header, otp_6277, otp_7702, otp_8130,
overload_mac, otp_8388, otp_8470, otp_8503, otp_8562,
otp_8665, otp_8911, otp_10302, otp_10820, otp_11728,
- encoding, function_macro].
+ encoding, function_macro, test_error, test_warning].
groups() ->
[{upcase_mac, [], [upcase_mac_1, upcase_mac_2]},
@@ -1055,7 +1056,65 @@ ifdef(Config) ->
],
?line [] = run(Config, Ts).
+%% OTP-12847: Test the -error directive.
+test_error(Config) ->
+ Cs = [{error_c1,
+ <<"-error(\"string and macro: \" ?MODULE_STRING).\n"
+ "-ifdef(NOT_DEFINED).\n"
+ " -error(\"this one will be skipped\").\n"
+ "-endif.\n">>,
+ {errors,[{1,epp,{error,"string and macro: epp_test"}}],[]}},
+
+ {error_c2,
+ <<"-ifdef(CONFIG_A).\n"
+ " t() -> a.\n"
+ "-else.\n"
+ "-ifdef(CONFIG_B).\n"
+ " t() -> b.\n"
+ "-else.\n"
+ "-error(\"Neither CONFIG_A nor CONFIG_B are available\").\n"
+ "-endif.\n"
+ "-endif.\n">>,
+ {errors,[{7,epp,{error,"Neither CONFIG_A nor CONFIG_B are available"}}],[]}},
+
+ {error_c3,
+ <<"-error(a b c).\n">>,
+ {errors,[{1,epp,{bad,error}}],[]}}
+ ],
+
+ [] = compile(Config, Cs),
+ ok.
+
+%% OTP-12847: Test the -warning directive.
+test_warning(Config) ->
+ Cs = [{warn_c1,
+ <<"-warning({a,term,?MODULE}).\n"
+ "-ifdef(NOT_DEFINED).\n"
+ "-warning(\"this one will be skipped\").\n"
+ "-endif.\n">>,
+ {warnings,[{1,epp,{warning,{a,term,epp_test}}}]}},
+
+ {warn_c2,
+ <<"-ifdef(CONFIG_A).\n"
+ " t() -> a.\n"
+ "-else.\n"
+ "-ifdef(CONFIG_B).\n"
+ " t() -> b.\n"
+ "-else.\n"
+ " t() -> c.\n"
+ "-warning(\"Using fallback\").\n"
+ "-endif.\n"
+ "-endif.\n">>,
+ {warnings,[{8,epp,{warning,"Using fallback"}}]}},
+
+ {warn_c3,
+ <<"-warning(a b c).\n">>,
+ {errors,[{1,epp,{bad,warning}}],[]}}
+ ],
+
+ [] = compile(Config, Cs),
+ ok.
overload_mac(doc) ->
["Advanced test on overloading macros."];
--
2.1.4
