summaryrefslogtreecommitdiff
path: root/src/rebar_erlc_compiler.erl
blob: 06070c9ee011f794098da5f13d9b93a625d3e807 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
%% -*- tab-width: 4;erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 et
%% -------------------------------------------------------------------
%%
%% rebar: Erlang Build Tools
%%
%% Copyright (c) 2009, 2010 Dave Smith (dizzyd@dizzyd.com)
%%
%% Permission is hereby granted, free of charge, to any person obtaining a copy
%% of this software and associated documentation files (the "Software"), to deal
%% in the Software without restriction, including without limitation the rights
%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
%% copies of the Software, and to permit persons to whom the Software is
%% furnished to do so, subject to the following conditions:
%%
%% The above copyright notice and this permission notice shall be included in
%% all copies or substantial portions of the Software.
%%
%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
%% THE SOFTWARE.
%% -------------------------------------------------------------------
-module(rebar_erlc_compiler).

-export([compile/2,
         clean/2]).

-export([doterl_compile/2,
         doterl_compile/3]).

-include("rebar.hrl").

%% ===================================================================
%% Public API
%% ===================================================================

%% Supported configuration variables:
%%
%% * erl_opts - Erlang list of options passed to compile:file/2
%%              It is also possible to specify platform specific
%%              options by specifying a triplet where the first string
%%              is a regex that is checked against Erlang's system
%%              architecture string. E.g. to define HAVE_SENDFILE only
%%              on systems with sendfile() and define BACKLOG on
%%              Linux/FreeBSD as 128 do:
%%              {erl_opts, [{platform_define,
%%                           "(linux|solaris|freebsd|darwin)",
%%                           'HAVE_SENDFILE'},
%%                          {platform_define, "(linux|freebsd)",
%%                           'BACKLOG', 128}]}.
%%

-spec compile(Config::#config{}, AppFile::string()) -> 'ok'.
compile(Config, _AppFile) ->
    rebar_base_compiler:run(Config,
                            rebar_config:get_list(Config, xrl_first_files, []),
                            "src", ".xrl", "src", ".erl",
                            fun compile_xrl/3),
    rebar_base_compiler:run(Config,
                            rebar_config:get_list(Config, yrl_first_files, []),
                            "src", ".yrl", "src", ".erl",
                            fun compile_yrl/3),
    doterl_compile(Config, "ebin"),
    rebar_base_compiler:run(Config, rebar_config:get_list(Config, mib_first_files, []),
                            "mibs", ".mib", "priv/mibs", ".bin",
                            fun compile_mib/3).

-spec clean(Config::#config{}, AppFile::string()) -> 'ok'.
clean(_Config, _AppFile) ->
    %% TODO: This would be more portable if it used Erlang to traverse
    %%       the dir structure and delete each file; however it would also
    %%       much slower.
    ok = rebar_file_utils:rm_rf("ebin/*.beam priv/mibs/*.bin"),

    YrlFiles = rebar_utils:find_files("src", "^.*\\.[x|y]rl\$"),
    rebar_file_utils:delete_each(
      [ binary_to_list(iolist_to_binary(re:replace(F, "\\.[x|y]rl$", ".erl")))
        || F <- YrlFiles  ]),

    %% Erlang compilation is recursive, so it's possible that we have a nested
    %% directory structure in ebin with .beam files within. As such, we want
    %% to scan whatever is left in the ebin/ directory for sub-dirs which
    %% satisfy our criteria.
    BeamFiles = rebar_utils:find_files("ebin", "^.*\\.beam\$"),
    rebar_file_utils:delete_each(BeamFiles),
    lists:foreach(fun(Dir) -> delete_dir(Dir, dirs(Dir)) end, dirs("ebin")),
    ok.


%% ===================================================================
%% .erl Compilation API (externally used by only eunit)
%% ===================================================================

-spec doterl_compile(Config::#config{}, OutDir::string()) -> 'ok'.
doterl_compile(Config, OutDir) ->
    doterl_compile(Config, OutDir, []).

doterl_compile(Config, OutDir, MoreSources) ->
    FirstErls = rebar_config:get_list(Config, erl_first_files, []),
    ErlOpts = filter_defines(rebar_config:get(Config, erl_opts, []), []),
    ?DEBUG("erl_opts ~p~n",[ErlOpts]),
    %% Support the src_dirs option allowing multiple directories to
    %% contain erlang source. This might be used, for example, should eunit tests be
    %% separated from the core application source.
    SrcDirs = src_dirs(proplists:append_values(src_dirs, ErlOpts)),
    RestErls  = [Source || Source <- gather_src(SrcDirs, []) ++ MoreSources,
                           lists:member(Source, FirstErls) == false],

    % Sort RestErls so that parse_transforms and behaviours are first
    % This should probably be somewhat combined with inspect_epp
    SortedRestErls = [K || {K, _V} <- lists:keysort(2,
        [{F, compile_priority(F)} || F <- RestErls ])],


    %% Make sure that ebin/ exists and is on the path
    ok = filelib:ensure_dir(filename:join("ebin", "dummy.beam")),
    CurrPath = code:get_path(),
    code:add_path("ebin"),
    rebar_base_compiler:run(Config, FirstErls, SortedRestErls,
                            fun(S, C) -> internal_erl_compile(S, C, OutDir,
                                                              ErlOpts)
                            end),
    code:set_path(CurrPath),
    ok.


%% ===================================================================
%% Internal functions
%% ===================================================================

-spec include_path(Source::string(), Config::#config{}) -> [string()].
include_path(Source, Config) ->
    ErlOpts = rebar_config:get(Config, erl_opts, []),
    ["include", filename:dirname(Source)] ++ proplists:get_all_values(i, ErlOpts).

-spec inspect(Source::string(), IncludePath::[string()]) -> {string(), [string()]}.
inspect(Source, IncludePath) ->
    ModuleDefault = filename:basename(Source, ".erl"),
    case epp:open(Source, IncludePath) of
        {ok, Epp} ->
            inspect_epp(Epp, Source, ModuleDefault, []);
        {error, Reason} ->
            ?DEBUG("Failed to inspect ~s: ~p\n", [Source, Reason]),
            {ModuleDefault, []}
    end.

-spec inspect_epp(Epp::pid(), Source::string(), Module::string(), Includes::[string()]) -> {string(), [string()]}.
inspect_epp(Epp, Source, Module, Includes) ->
    case epp:parse_erl_form(Epp) of
        {ok, {attribute, _, module, ModInfo}} ->
            case ModInfo of
                %% Typical module name, single atom
                ActualModule when is_atom(ActualModule) ->
                    ActualModuleStr = atom_to_list(ActualModule);
                %% Packag-ized module name, list of atoms
                ActualModule when is_list(ActualModule) ->
                    ActualModuleStr = string:join([atom_to_list(P) || P <- ActualModule], ".");
                %% Parameterized module name, single atom
                {ActualModule, _} when is_atom(ActualModule) ->
                    ActualModuleStr = atom_to_list(ActualModule);
                %% Parameterized and packagized module name, list of atoms
                {ActualModule, _} when is_list(ActualModule) ->
                    ActualModuleStr = string:join([atom_to_list(P) || P <- ActualModule], ".")
            end,
            inspect_epp(Epp, Source, ActualModuleStr, Includes);
        {ok, {attribute, 1, file, {Module, 1}}} ->
            inspect_epp(Epp, Source, Module, Includes);
        {ok, {attribute, 1, file, {Source, 1}}} ->
            inspect_epp(Epp, Source, Module, Includes);
        {ok, {attribute, 1, file, {IncFile, 1}}} ->
            inspect_epp(Epp, Source, Module, [IncFile | Includes]);
        {eof, _} ->
            epp:close(Epp),
            {Module, Includes};
        _ ->
            inspect_epp(Epp, Source, Module, Includes)
    end.

-spec needs_compile(Source::string(), Target::string(), Hrls::[string()]) -> boolean().
needs_compile(Source, Target, Hrls) ->
    TargetLastMod = filelib:last_modified(Target),
    lists:any(fun(I) -> TargetLastMod < filelib:last_modified(I) end,
              [Source] ++ Hrls).

-spec internal_erl_compile(Source::string(), Config::#config{},
                           Outdir::string(), ErlOpts::list()) -> 'ok' | 'skipped'.
internal_erl_compile(Source, Config, Outdir, ErlOpts) ->
    %% Determine the target name and includes list by inspecting the source file
    {Module, Hrls} = inspect(Source, include_path(Source, Config)),

    %% Construct the target filename
    Target = filename:join([Outdir | string:tokens(Module, ".")]) ++ ".beam",
    ok = filelib:ensure_dir(Target),

    %% If the file needs compilation, based on last mod date of includes or
    %% the target,
    case needs_compile(Source, Target, Hrls) of
        true ->
            Opts = [{i, "include"}, {outdir, filename:dirname(Target)}, report, return] ++
                ErlOpts,
            case compile:file(Source, Opts) of
                {ok, _, []} ->
                    ok;
                {ok, _, _Warnings} ->
                    %% We got at least one warning -- if fail_on_warning is in options, fail
                    case lists:member(fail_on_warning, Opts) of
                        true ->
                            ?FAIL;
                        false ->
                            ok
                    end;
                _ ->
                    ?FAIL
            end;
        false ->
            skipped
    end.

-spec compile_mib(Source::string(), Target::string(), Config::#config{}) -> 'ok'.
compile_mib(Source, Target, Config) ->
    ok = rebar_utils:ensure_dir(Target),
    Opts = [{outdir, "priv/mibs"}, {i, ["priv/mibs"]}] ++
        rebar_config:get(Config, mib_opts, []),
    case snmpc:compile(Source, Opts) of
        {ok, _} ->
            ok;
        {error, compilation_failed} ->
            ?FAIL
    end.

-spec compile_xrl(Source::string(), Target::string(), Config::#config{}) -> 'ok'.
compile_xrl(Source, Target, Config) ->
    Opts = [{scannerfile, Target}, {return, true}
            |rebar_config:get(Config, xrl_opts, [])],
    compile_xrl_yrl(Source, Target, Config, Opts, leex).

-spec compile_yrl(Source::string(), Target::string(), Config::#config{}) -> 'ok'.
compile_yrl(Source, Target, Config) ->
    Opts = [{parserfile, Target}, {return, true}
            |rebar_config:get(Config, yrl_opts, [])],
    compile_xrl_yrl(Source, Target, Config, Opts, yecc).

-spec compile_xrl_yrl(Source::string(), Target::string(), Config::#config{},
                      Opts::list(), Mod::atom()) -> 'ok'.
compile_xrl_yrl(Source, Target, Config, Opts, Mod) ->
    case needs_compile(Source, Target, []) of
        true ->
            case Mod:file(Source, Opts) of
                {ok, _, []} ->
                    ok;
                {ok, _, _Warnings} ->
                    case lists:member(fail_on_warnings, Config) of
                        true ->
                            ?FAIL;
                        false ->
                            ok
                    end;
                _X ->
                    ?FAIL
            end;
        false ->
            skipped
    end.

gather_src([], Srcs) ->
    Srcs;
gather_src([Dir|Rest], Srcs) ->
    gather_src(Rest, Srcs ++ rebar_utils:find_files(Dir, ".*\\.erl\$")).

-spec src_dirs(SrcDirs::[string()]) -> [string()].
src_dirs([]) ->
    ["src"];
src_dirs(SrcDirs) ->
    SrcDirs ++ src_dirs([]).

-spec dirs(Dir::string()) -> [string()].
dirs(Dir) ->
    [F || F <- filelib:wildcard(filename:join([Dir, "*"])), filelib:is_dir(F)].

-spec delete_dir(Dir::string(), Subdirs::[string()]) -> 'ok' | {'error', atom()}.
delete_dir(Dir, []) ->
    file:del_dir(Dir);
delete_dir(Dir, Subdirs) ->
    lists:foreach(fun(D) -> delete_dir(D, dirs(D)) end, Subdirs),
    file:del_dir(Dir).

-spec compile_priority(File::string()) -> pos_integer().
compile_priority(File) ->
    case epp_dodger:parse_file(File) of
        {error, _} ->
            10; % couldn't parse the file, default priority
        {ok, Trees} ->
            F2 = fun({tree,arity_qualifier,_,
                        {arity_qualifier,{tree,atom,_,behaviour_info},
                            {tree,integer,_,1}}}, _) ->
                    2;
                ({tree,arity_qualifier,_,
                        {arity_qualifier,{tree,atom,_,parse_transform},
                            {tree,integer,_,2}}}, _) ->
                    1;
                (_, Acc) ->
                    Acc
            end,

            F = fun({tree, attribute, _, {attribute, {tree, atom, _, export},
                            [{tree, list, _, {list, List, none}}]}}, Acc) ->
                    lists:foldl(F2, Acc, List);
                (_, Acc) ->
                    Acc
            end,

            lists:foldl(F, 10, Trees)
    end.

%%
%% Filter a list of erl_opts platform_define options such that only
%% those which match the provided architecture regex are returned.
%%
-spec filter_defines(ErlOpts::list(),Acc::list()) -> list().
filter_defines([], Acc) ->
    lists:reverse(Acc);
filter_defines([{platform_define, ArchRegex, Key} | Rest], Acc) ->
    case rebar_utils:is_arch(ArchRegex) of
        true ->
            filter_defines(Rest, [{d, Key} | Acc]);
        false ->
            filter_defines(Rest, Acc)
    end;
filter_defines([{platform_define, ArchRegex, Key, Value} | Rest], Acc) ->
    case rebar_utils:is_arch(ArchRegex) of
        true ->
            filter_defines(Rest, [{d, Key, Value} | Acc]);
        false ->
            filter_defines(Rest, Acc)
    end;
filter_defines([Opt | Rest], Acc) ->
    filter_defines(Rest, [Opt | Acc]).