aboutsummaryrefslogblamecommitdiffstats
path: root/lib/compiler/src/sys_expand_pmod.erl
blob: dbd5c1ec2f496d631fe9a2c3e2bd53251cbfda0f (plain) (tree)
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
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423






































































































































































































































































































































































































































                                                                                     
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 2004-2009. 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%
%%
-module(sys_expand_pmod).

%% Expand function definition forms of parameterized module. We assume
%% all record definitions, imports, queries, etc., have been expanded
%% away. Any calls on the form 'foo(...)' must be calls to local
%% functions. Auto-generated functions (module_info,...) have not yet
%% been added to the function definitions, but are listed in 'defined'
%% and 'exports'. The automatic 'new/N' function is neither added to the
%% definitions nor to the 'exports'/'defines' lists yet.

-export([forms/4]).

-record(pmod, {parameters, exports, defined, predef}).

%% TODO: more abstract handling of predefined/static functions.

forms(Fs0, Ps, Es0, Ds0) ->
    PreDef = [{module_info,0},{module_info,1}],
    forms(Fs0, Ps, Es0, Ds0, PreDef).

forms(Fs0, Ps, Es0, Ds0, PreDef) ->
    St0 = #pmod{parameters=Ps,exports=Es0,defined=Ds0, predef=PreDef},
    {Fs1, St1} = forms(Fs0, St0),
    Es1 = update_function_names(Es0, St1),
    Ds1 = update_function_names(Ds0, St1),
    Fs2 = update_forms(Fs1, St1),
    {Fs2,Es1,Ds1}.

%% This is extremely simplistic for now; all functions get an extra
%% parameter, whether they need it or not, except for static functions.

update_function_names(Es, St) ->
    [update_function_name(E, St) || E <- Es].

update_function_name(E={F,A}, St) when F =/= new ->
    case ordsets:is_element(E, St#pmod.predef) of
	true -> E;
	false -> {F, A + 1}
    end;
update_function_name(E, _St) ->
    E.

update_forms([{function,L,N,A,Cs}|Fs],St) when N =/= new ->
    [{function,L,N,A+1,Cs}|update_forms(Fs,St)];
update_forms([F|Fs],St) ->
    [F|update_forms(Fs,St)];
update_forms([],_St) ->
    [].

%% Process the program forms.

forms([F0|Fs0],St0) ->
    {F1,St1} = form(F0,St0),
    {Fs1,St2} = forms(Fs0,St1),
    {[F1|Fs1],St2};
forms([], St0) ->
    {[], St0}.

%% Only function definitions are of interest here. State is not updated.
form({function,Line,Name0,Arity0,Clauses0},St) when Name0 =/= new ->
    {Name,Arity,Clauses} = function(Name0, Arity0, Clauses0, St),
    {{function,Line,Name,Arity,Clauses},St};
%% Pass anything else through
form(F,St) -> {F,St}.

function(Name, Arity, Clauses0, St) ->
    Clauses1 = clauses(Clauses0,St),
    {Name,Arity,Clauses1}.

clauses([C|Cs],St) ->
    {clause,L,H,G,B} = clause(C,St),
    T = {tuple,L,[{var,L,V} || V <- ['_'|St#pmod.parameters]]},
    [{clause,L,H++[{match,L,T,{var,L,'THIS'}}],G,B}|clauses(Cs,St)];
clauses([],_St) -> [].

clause({clause,Line,H0,G0,B0},St) ->
    H1 = head(H0,St),
    G1 = guard(G0,St),
    B1 = exprs(B0,St),
    {clause,Line,H1,G1,B1}.

head(Ps,St) -> patterns(Ps,St).

patterns([P0|Ps],St) ->
    P1 = pattern(P0,St),
    [P1|patterns(Ps,St)];
patterns([],_St) -> [].

string_to_conses([], _Line, Tail) ->
    Tail;
string_to_conses([E|Rest], Line, Tail) ->
    {cons, Line, {integer, Line, E}, string_to_conses(Rest, Line, Tail)}.

pattern({var,_Line,_V}=Var,_St) -> Var;
pattern({match,Line,L0,R0},St) ->
    L1 = pattern(L0,St),
    R1 = pattern(R0,St),
    {match,Line,L1,R1};
pattern({integer,_Line,_I}=Integer,_St) -> Integer;
pattern({char,_Line,_C}=Char,_St) -> Char;
pattern({float,_Line,_F}=Float,_St) -> Float;
pattern({atom,_Line,_A}=Atom,_St) -> Atom;
pattern({string,_Line,_S}=String,_St) -> String;
pattern({nil,_Line}=Nil,_St) -> Nil;
pattern({cons,Line,H0,T0},St) ->
    H1 = pattern(H0,St),
    T1 = pattern(T0,St),
    {cons,Line,H1,T1};
pattern({tuple,Line,Ps0},St) ->
    Ps1 = pattern_list(Ps0,St),
    {tuple,Line,Ps1};
pattern({bin,Line,Fs},St) ->
    Fs2 = pattern_grp(Fs,St),
    {bin,Line,Fs2};
pattern({op,_Line,'++',{nil,_},R},St) ->
    pattern(R,St);
pattern({op,_Line,'++',{cons,Li,{char,_C2,_I}=Char,T},R},St) ->
    pattern({cons,Li,Char,{op,Li,'++',T,R}},St);
pattern({op,_Line,'++',{cons,Li,{integer,_L2,_I}=Integer,T},R},St) ->
    pattern({cons,Li,Integer,{op,Li,'++',T,R}},St);
pattern({op,_Line,'++',{string,Li,L},R},St) ->
    pattern(string_to_conses(L, Li, R),St);
pattern({op,_Line,_Op,_A}=Op4,_St) -> Op4;
pattern({op,_Line,_Op,_L,_R}=Op5,_St) -> Op5.

pattern_grp([{bin_element,L1,E1,S1,T1} | Fs],St) ->
    S2 = case S1 of
	     default ->
		 default;
	     _ ->
		 expr(S1,St)
	 end,
    T2 = case T1 of
	     default ->
		 default;
	     _ ->
		 bit_types(T1)
	 end,
    [{bin_element,L1,expr(E1,St),S2,T2} | pattern_grp(Fs,St)];
pattern_grp([],_St) ->
    [].

bit_types([]) ->
    [];
bit_types([Atom | Rest]) when is_atom(Atom) ->
    [Atom | bit_types(Rest)];
bit_types([{Atom, Integer} | Rest]) when is_atom(Atom), is_integer(Integer) ->
    [{Atom, Integer} | bit_types(Rest)].

pattern_list([P0|Ps],St) ->
    P1 = pattern(P0,St),
    [P1|pattern_list(Ps,St)];
pattern_list([],_St) -> [].

guard([G0|Gs],St) when is_list(G0) ->
    [guard0(G0,St) | guard(Gs,St)];
guard(L,St) ->
    guard0(L,St).

guard0([G0|Gs],St) ->
    G1 = guard_test(G0,St),
    [G1|guard0(Gs,St)];
guard0([],_St) -> [].

guard_test(Expr={call,Line,{atom,La,F},As0},St) ->
    case erl_internal:type_test(F, length(As0)) of
	true ->
	    As1 = gexpr_list(As0,St),
	    {call,Line,{atom,La,F},As1};
	_ ->
	    gexpr(Expr,St)
    end;
guard_test(Any,St) ->
    gexpr(Any,St).

gexpr({var,_L,_V}=Var,_St) -> Var;
% %% alternative implementation of accessing module parameters
%     case index(V,St#pmod.parameters) of
% 	N when N > 0 ->
% 	    {call,L,{remote,L,{atom,L,erlang},{atom,L,element}},
% 	     [{integer,L,N+1},{var,L,'THIS'}]};
% 	_ ->
% 	    Var
%     end;
gexpr({integer,_Line,_I}=Integer,_St) -> Integer;
gexpr({char,_Line,_C}=Char,_St) -> Char;
gexpr({float,_Line,_F}=Float,_St) -> Float;
gexpr({atom,_Line,_A}=Atom,_St) -> Atom;
gexpr({string,_Line,_S}=String,_St) -> String;
gexpr({nil,_Line}=Nil,_St) -> Nil;
gexpr({cons,Line,H0,T0},St) ->
    H1 = gexpr(H0,St),
    T1 = gexpr(T0,St),
    {cons,Line,H1,T1};
gexpr({tuple,Line,Es0},St) ->
    Es1 = gexpr_list(Es0,St),
    {tuple,Line,Es1};
gexpr({call,Line,{atom,_La,F}=Atom,As0},St) ->
    true = erl_internal:guard_bif(F, length(As0)),
    As1 = gexpr_list(As0,St),
    {call,Line,Atom,As1};
%% Pre-expansion generated calls to erlang:is_record/3 must also be handled
gexpr({call,Line,{remote,La,{atom,Lb,erlang},{atom,Lc,is_record}},[_,_,_]=As0},St) ->
    As1 = gexpr_list(As0,St),
    {call,Line,{remote,La,{atom,Lb,erlang},{atom,Lc,is_record}},As1};
%% Guard BIFs can be remote, but only in the module erlang...
gexpr({call,Line,{remote,La,{atom,Lb,erlang},{atom,Lc,F}},As0},St) ->
    A = length(As0),
    true =
	erl_internal:guard_bif(F, A) orelse erl_internal:arith_op(F, A) orelse
	erl_internal:comp_op(F, A) orelse erl_internal:bool_op(F, A),
    As1 = gexpr_list(As0,St),
    {call,Line,{remote,La,{atom,Lb,erlang},{atom,Lc,F}},As1};
%% Unfortunately, writing calls as {M,F}(...) is also allowed.
gexpr({call,Line,{tuple,La,[{atom,Lb,erlang},{atom,Lc,F}]},As0},St) ->
    A = length(As0),
    true =
	erl_internal:guard_bif(F, A) orelse erl_internal:arith_op(F, A) orelse 
	erl_internal:comp_op(F, A) orelse erl_internal:bool_op(F, A),
    As1 = gexpr_list(As0,St),
    {call,Line,{tuple,La,[{atom,Lb,erlang},{atom,Lc,F}]},As1};
gexpr({bin,Line,Fs},St) ->
    Fs2 = pattern_grp(Fs,St),
    {bin,Line,Fs2};
gexpr({op,Line,Op,A0},St) ->
    true = erl_internal:arith_op(Op, 1) orelse erl_internal:bool_op(Op, 1),
    A1 = gexpr(A0,St),
    {op,Line,Op,A1};
gexpr({op,Line,Op,L0,R0},St) ->
    true =
	Op =:= 'andalso' orelse Op =:= 'orelse' orelse
	erl_internal:arith_op(Op, 2) orelse
	erl_internal:bool_op(Op, 2) orelse erl_internal:comp_op(Op, 2),
    L1 = gexpr(L0,St),
    R1 = gexpr(R0,St),
    {op,Line,Op,L1,R1}.

gexpr_list([E0|Es],St) ->
    E1 = gexpr(E0,St),
    [E1|gexpr_list(Es,St)];
gexpr_list([],_St) -> [].

exprs([E0|Es],St) ->
    E1 = expr(E0,St),
    [E1|exprs(Es,St)];
exprs([],_St) -> [].

expr({var,_L,_V}=Var,_St) ->
    Var;
%     case index(V,St#pmod.parameters) of
% 	N when N > 0 ->
% 	    {call,L,{remote,L,{atom,L,erlang},{atom,L,element}},
% 	     [{integer,L,N+1},{var,L,'THIS'}]};
% 	_ ->
% 	    Var
%     end;
expr({integer,_Line,_I}=Integer,_St) -> Integer;
expr({float,_Line,_F}=Float,_St) -> Float;
expr({atom,_Line,_A}=Atom,_St) -> Atom;
expr({string,_Line,_S}=String,_St) -> String;
expr({char,_Line,_C}=Char,_St) -> Char;
expr({nil,_Line}=Nil,_St) -> Nil;
expr({cons,Line,H0,T0},St) ->
    H1 = expr(H0,St),
    T1 = expr(T0,St),
    {cons,Line,H1,T1};
expr({lc,Line,E0,Qs0},St) ->
    Qs1 = lc_quals(Qs0,St),
    E1 = expr(E0,St),
    {lc,Line,E1,Qs1};
expr({tuple,Line,Es0},St) ->
    Es1 = expr_list(Es0,St),
    {tuple,Line,Es1};
expr({block,Line,Es0},St) ->
    Es1 = exprs(Es0,St),
    {block,Line,Es1};
expr({'if',Line,Cs0},St) ->
    Cs1 = icr_clauses(Cs0,St),
    {'if',Line,Cs1};
expr({'case',Line,E0,Cs0},St) ->
    E1 = expr(E0,St),
    Cs1 = icr_clauses(Cs0,St),
    {'case',Line,E1,Cs1};
expr({'receive',Line,Cs0},St) ->
    Cs1 = icr_clauses(Cs0,St),
    {'receive',Line,Cs1};
expr({'receive',Line,Cs0,To0,ToEs0},St) ->
    To1 = expr(To0,St),
    ToEs1 = exprs(ToEs0,St),
    Cs1 = icr_clauses(Cs0,St),
    {'receive',Line,Cs1,To1,ToEs1};
expr({'try',Line,Es0,Scs0,Ccs0,As0},St) ->
    Es1 = exprs(Es0,St),
    Scs1 = icr_clauses(Scs0,St),
    Ccs1 = icr_clauses(Ccs0,St),
    As1 = exprs(As0,St),
    {'try',Line,Es1,Scs1,Ccs1,As1};
expr({'fun',Line,Body,Info},St) ->
    case Body of
	{clauses,Cs0} ->
	    Cs1 = fun_clauses(Cs0,St),
	    {'fun',Line,{clauses,Cs1},Info};
	{function,F,A} = Function ->
	    {F1,A1} = update_function_name({F,A},St),
	    if A1 =:= A ->
		    {'fun',Line,Function,Info};
	       true ->
		    %% Must rewrite local fun-name to a fun that does a
		    %% call with the extra THIS parameter.
		    As = make_vars(A, Line),
		    As1 = As ++ [{var,Line,'THIS'}],
		    Call = {call,Line,{atom,Line,F1},As1},
		    Cs = [{clause,Line,As,[],[Call]}],
		    {'fun',Line,{clauses,Cs},Info}
	    end;
	{function,_M,_F,_A} = Fun4 ->		%This is an error in lint!
	    {'fun',Line,Fun4,Info}
    end;
expr({call,Lc,{atom,_,instance}=Name,As0},St) ->
    %% All local functions 'instance(...)' are static by definition,
    %% so they do not take a 'THIS' argument when called
    As1 = expr_list(As0,St),
    {call,Lc,Name,As1};
expr({call,Lc,{atom,_,new}=Name,As0},St) ->
    %% All local functions 'new(...)' are static by definition,
    %% so they do not take a 'THIS' argument when called
    As1 = expr_list(As0,St),
    {call,Lc,Name,As1};
expr({call,Lc,{atom,_,module_info}=Name,As0},St)
  when length(As0) =:= 0; length(As0) =:= 1 ->
    %% The module_info/0 and module_info/1 functions are also static.
    As1 = expr_list(As0,St),
    {call,Lc,Name,As1};
expr({call,Lc,{atom,_Lf,_F}=Atom,As0},St) ->
    %% Local function call - needs THIS parameter.
    As1 = expr_list(As0,St),
    {call,Lc,Atom,As1 ++ [{var,0,'THIS'}]};
expr({call,Line,F0,As0},St) ->
    %% Other function call
    F1 = expr(F0,St),
    As1 = expr_list(As0,St),
    {call,Line,F1,As1};
expr({'catch',Line,E0},St) ->
    E1 = expr(E0,St),
    {'catch',Line,E1};
expr({match,Line,P0,E0},St) ->
    E1 = expr(E0,St),
    P1 = pattern(P0,St),
    {match,Line,P1,E1};
expr({bin,Line,Fs},St) ->
    Fs2 = pattern_grp(Fs,St),
    {bin,Line,Fs2};
expr({op,Line,Op,A0},St) ->
    A1 = expr(A0,St),
    {op,Line,Op,A1};
expr({op,Line,Op,L0,R0},St) ->
    L1 = expr(L0,St),
    R1 = expr(R0,St),
    {op,Line,Op,L1,R1};
%% The following are not allowed to occur anywhere!
expr({remote,Line,M0,F0},St) ->
    M1 = expr(M0,St),
    F1 = expr(F0,St),
    {remote,Line,M1,F1}.

expr_list([E0|Es],St) ->
    E1 = expr(E0,St),
    [E1|expr_list(Es,St)];
expr_list([],_St) -> [].

icr_clauses([C0|Cs],St) ->
    C1 = clause(C0,St),
    [C1|icr_clauses(Cs,St)];
icr_clauses([],_St) -> [].

lc_quals([{generate,Line,P0,E0}|Qs],St) ->
    E1 = expr(E0,St),
    P1 = pattern(P0,St),
    [{generate,Line,P1,E1}|lc_quals(Qs,St)];
lc_quals([E0|Qs],St) ->
    E1 = expr(E0,St),
    [E1|lc_quals(Qs,St)];
lc_quals([],_St) -> [].

fun_clauses([C0|Cs],St) ->
    C1 = clause(C0,St),
    [C1|fun_clauses(Cs,St)];
fun_clauses([],_St) -> [].

%% %% Return index from 1 upwards, or 0 if not in the list.
%%
%% index(X,Ys) -> index(X,Ys,1).
%%
%% index(X,[X|Ys],A) -> A;
%% index(X,[Y|Ys],A) -> index(X,Ys,A+1);
%% index(X,[],A) -> 0.

make_vars(N, L) ->
    make_vars(1, N, L).

make_vars(N, M, L) when N =< M ->
    V = list_to_atom("X"++integer_to_list(N)),
    [{var,L,V} | make_vars(N + 1, M, L)];
make_vars(_, _, _) ->
    [].