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34e49164 C |
1 | (*****************************************************************************) |
2 | (* Cocci vs C *) | |
3 | (*****************************************************************************) | |
4 | ||
5 | (* This module was introduced to factorize code between | |
6 | * pattern.ml and transformation.ml. In both cases we need | |
7 | * to "compare" a piece of C with a piece of Cocci, and depending | |
8 | * if we want just to pattern or transform, we perform different | |
9 | * actions on the tokens. So, the common code is in this module | |
10 | * and the module specific actions are in pattern.ml and transformation.ml. | |
11 | * | |
12 | * We could have used a visitor approach as in visitor_c but I prefer | |
13 | * this time to use a functor. The specific actions are passed | |
14 | * via a module to the functor. | |
15 | * | |
16 | * If the functor is too complex too understand, you can look at | |
17 | * the comments in pattern.ml and transformation.ml to look at | |
18 | * how it was done before, which may help to understand how | |
19 | * it is done now. | |
20 | * | |
21 | * You can also look at the papers on parser combinators in haskell | |
22 | * (cf a pearl by meijer in ICFP) to understand our monadic | |
23 | * approach to matching/unifying. | |
24 | *) | |
25 | ||
26 | ||
27 | (* should be used as less as possible. Most of the time the code in | |
28 | * cocci_vs_c should be the same if we pattern or transform *) | |
29 | type mode = PatternMode | TransformMode | |
30 | ||
31 | (* used in both pattern and transform, in envf *) | |
32 | val equal_metavarval : | |
33 | Ast_c.metavar_binding_kind -> Ast_c.metavar_binding_kind -> bool | |
34 | ||
35 | (*****************************************************************************) | |
36 | (* The parameter of the functor (the specific actions) *) | |
37 | (*****************************************************************************) | |
38 | ||
39 | ||
40 | module type PARAM = | |
41 | sig | |
42 | type tin | |
43 | type 'a tout | |
44 | ||
45 | (* a matcher between 'a' and 'b' take 'a' and 'b' in parameter, | |
46 | * and "something" (tin; a state that is threaded across calls), | |
47 | * and return a new 'a' and 'b' encapsulated in "something" (tout) | |
48 | *) | |
49 | type ('a, 'b) matcher = 'a -> 'b -> tin -> ('a * 'b) tout | |
50 | ||
51 | val mode : mode | |
52 | ||
53 | (* -------------------------------------------------------------------- *) | |
54 | (* The monadic combinators *) | |
55 | (* -------------------------------------------------------------------- *) | |
56 | ||
57 | (* it kinds of take a matcher in parameter, and another matcher, | |
58 | * and returns a matcher, so =~ matcher -> matcher -> matcher | |
59 | *) | |
60 | val ( >>= ) : | |
61 | (tin -> ('a * 'b) tout) -> | |
62 | ('a -> 'b -> tin -> ('c * 'd) tout) -> | |
63 | tin -> ('c * 'd) tout | |
64 | ||
65 | val return : 'a * 'b -> tin -> ('a * 'b) tout | |
66 | val fail : tin -> ('a * 'b) tout | |
67 | ||
68 | val ( >||> ) : (tin -> 'a tout) -> (tin -> 'a tout) -> tin -> 'a tout | |
69 | val ( >|+|> ) : (tin -> 'a tout) -> (tin -> 'a tout) -> tin -> 'a tout | |
70 | val ( >&&> ) : (tin -> bool) -> (tin -> 'a tout) -> tin -> 'a tout | |
71 | ||
72 | (* -------------------------------------------------------------------- *) | |
73 | (* Tokens tagging *) | |
74 | (* -------------------------------------------------------------------- *) | |
75 | val tokenf : ('a Ast_cocci.mcode, Ast_c.info) matcher | |
76 | val tokenf_mck : (Ast_cocci.mcodekind, Ast_c.info) matcher | |
77 | ||
78 | (* -------------------------------------------------------------------- *) | |
79 | (* Distr_f functions, to tag a range of tokens *) | |
80 | (* -------------------------------------------------------------------- *) | |
81 | ||
82 | val distrf_e : | |
83 | (Ast_cocci.meta_name Ast_cocci.mcode, Ast_c.expression) matcher | |
84 | ||
85 | val distrf_args : | |
86 | (Ast_cocci.meta_name Ast_cocci.mcode, | |
87 | (Ast_c.argument, Ast_c.il) Common.either list) | |
88 | matcher | |
89 | ||
90 | val distrf_type : | |
91 | (Ast_cocci.meta_name Ast_cocci.mcode, Ast_c.fullType) matcher | |
92 | ||
93 | val distrf_params : | |
94 | (Ast_cocci.meta_name Ast_cocci.mcode, | |
95 | (Ast_c.parameterType, Ast_c.il) Common.either list) | |
96 | matcher | |
97 | val distrf_param : | |
98 | (Ast_cocci.meta_name Ast_cocci.mcode, Ast_c.parameterType) matcher | |
99 | ||
100 | val distrf_ini : | |
101 | (Ast_cocci.meta_name Ast_cocci.mcode, Ast_c.initialiser) matcher | |
102 | ||
103 | val distrf_node : | |
104 | (Ast_cocci.meta_name Ast_cocci.mcode, Control_flow_c.node) matcher | |
105 | ||
106 | val distrf_define_params : | |
107 | (Ast_cocci.meta_name Ast_cocci.mcode, | |
108 | (string Ast_c.wrap, Ast_c.il) Common.either list) | |
109 | matcher | |
110 | ||
111 | val distrf_struct_fields : | |
112 | (Ast_cocci.meta_name Ast_cocci.mcode, Ast_c.field Ast_c.wrap list) | |
113 | matcher | |
114 | ||
115 | val distrf_cst : | |
116 | (Ast_cocci.meta_name Ast_cocci.mcode, | |
117 | (Ast_c.constant, string) Common.either Ast_c.wrap) | |
118 | matcher | |
119 | ||
120 | (* -------------------------------------------------------------------- *) | |
121 | (* Modifying nested expression and nested types, with Exp and Ty *) | |
122 | (* -------------------------------------------------------------------- *) | |
123 | ||
124 | val cocciExp : | |
125 | (Ast_cocci.expression, Ast_c.expression) matcher -> | |
126 | (Ast_cocci.expression, Control_flow_c.node) matcher | |
127 | ||
128 | val cocciExpExp : | |
129 | (Ast_cocci.expression, Ast_c.expression) matcher -> | |
130 | (Ast_cocci.expression, Ast_c.expression) matcher | |
131 | ||
132 | val cocciTy : | |
133 | (Ast_cocci.fullType, Ast_c.fullType) matcher -> | |
134 | (Ast_cocci.fullType, Control_flow_c.node) matcher | |
135 | ||
1be43e12 C |
136 | val cocciInit : |
137 | (Ast_cocci.initialiser, Ast_c.initialiser) matcher -> | |
138 | (Ast_cocci.initialiser, Control_flow_c.node) matcher | |
139 | ||
34e49164 C |
140 | (* -------------------------------------------------------------------- *) |
141 | (* Environment manipulation. Extract info from tin, the "something" *) | |
142 | (* -------------------------------------------------------------------- *) | |
143 | val envf : | |
144 | Ast_cocci.keep_binding -> | |
145 | Ast_cocci.inherited -> | |
146 | Ast_cocci.meta_name Ast_cocci.mcode * Ast_c.metavar_binding_kind * | |
147 | (* pos info, if needed *) | |
148 | (unit -> Common.filename * Ast_c.posl * Ast_c.posl) -> | |
149 | (unit -> tin -> 'x tout) -> (tin -> 'x tout) | |
150 | ||
151 | val check_constraints : | |
152 | ('a, 'b) matcher -> 'a list -> 'b -> | |
153 | (unit -> tin -> 'x tout) -> (tin -> 'x tout) | |
154 | ||
155 | val all_bound : Ast_cocci.meta_name list -> tin -> bool | |
156 | ||
157 | ||
158 | val optional_storage_flag : (bool -> tin -> 'x tout) -> (tin -> 'x tout) | |
159 | val optional_qualifier_flag : (bool -> tin -> 'x tout) -> (tin -> 'x tout) | |
160 | val value_format_flag: (bool -> tin -> 'x tout) -> (tin -> 'x tout) | |
161 | ||
162 | ||
163 | end | |
164 | ||
165 | ||
166 | (*****************************************************************************) | |
167 | (* The functor itself *) | |
168 | (*****************************************************************************) | |
169 | ||
170 | module COCCI_VS_C : | |
171 | functor (X : PARAM) -> | |
172 | sig | |
173 | type ('a, 'b) matcher = 'a -> 'b -> X.tin -> ('a * 'b) X.tout | |
174 | ||
175 | val rule_elem_node : (Ast_cocci.rule_elem, Control_flow_c.node) matcher | |
176 | ||
177 | val expression : (Ast_cocci.expression, Ast_c.expression) matcher | |
178 | ||
179 | (* there is far more functions in this functor but they do not have | |
180 | * to be exported | |
181 | *) | |
182 | ||
183 | end | |
184 | ||
185 |