1 //////////////////////////////////////////////////////////////////////////////
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5 // public domain. The author(s) of this software reserve no copyrights on
6 // the source code and any code generated using the tools. You are encouraged
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15 // your programs, and that this notice be preserved intact in all the source
18 // This software is still under development and we welcome(read crave for)
19 // any suggestions and help from the users.
23 //////////////////////////////////////////////////////////////////////////////
25 //////////////////////////////////////////////////////////////////////////////
26 // This file implements the type analysis methods for the SETL sublanguage.
27 // Type analysis is used to:
28 // (a) Check for valid typing of the soruce program.
29 // (b) Select implementations of the set-theoretic data structures.
31 // For details, see Paige, Schwartz, Cai, et al.
32 //////////////////////////////////////////////////////////////////////////////
34 #include "irdef.ph" // intermediate representations
35 #include "setl.ph" // SETL abstract syntax
37 //////////////////////////////////////////////////////////////////////////////
38 // Method to infer the type a SETL expression when given an expression
39 // and an type binding environment.
40 //////////////////////////////////////////////////////////////////////////////
41 TY InferSETL::infer(EXPR e, Map<ID,TY>& env)
43 case om_exp: return var_ty(no_ty);
44 case typed_exp (e, ty):
45 case ident_exp id: return env[id];
46 case int_exp _: return Infer::integer_ty;
47 case real_exp _: return Infer::real_ty;
48 case string_exp _: return Infer::string_ty;
49 case char_exp _: return Infer::character_ty;
51 case set_exp es: return set_ty(infer(es,env));
52 case multiset_exp es: return multiset_ty(infer(es,env));
53 case tuple_exp es: return tuple_ty(infer(es,env));
54 case map_exp es: return map_ty(infer(es,env));
55 case multimap_exp es: return multimap_ty(infer(es,env));
56 case record_exp es: return record_ty(infer(es,env));
57 case c_exp _: return var_ty(no_ty);