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92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
/*++
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Copyright (c) 2006 Microsoft Corporation
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Module Name:
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dl_mk_unbound_compressor.h
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Abstract:
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<abstract>
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Author:
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Krystof Hoder (t-khoder) 2010-10-4.
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Revision History:
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--*/
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#ifndef _DL_MK_UNBOUND_COMPRESSOR_H_
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#define _DL_MK_UNBOUND_COMPRESSOR_H_
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#include<utility>
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#include"map.h"
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#include"obj_pair_hashtable.h"
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#include"dl_context.h"
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#include"dl_rule_set.h"
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#include"dl_rule_transformer.h"
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namespace datalog {
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/**
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\brief Functor for introducing auxiliary predicates to avoid unbound variables in
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rule heads.
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A rule
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P(x,_) :- T(x).
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is replaced by
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P1(x) :- T(x).
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and for each occurrence of P in a tail of a rule, a new rule is added with P1 in
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its place.
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*/
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class mk_unbound_compressor : public rule_transformer::plugin {
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/** predicate and index of compressed argument */
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typedef std::pair<func_decl*,unsigned> c_info;
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typedef pair_hash<ptr_hash<func_decl>,unsigned_hash> c_info_hash;
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/** predicates that are results of compression */
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typedef map<c_info, func_decl*, c_info_hash, default_eq<c_info> > c_map;
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typedef hashtable<c_info, c_info_hash, default_eq<c_info> > in_progress_table;
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typedef svector<c_info> todo_stack;
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context & m_context;
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ast_manager & m_manager;
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rule_ref_vector m_rules;
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bool m_modified;
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todo_stack m_todo;
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in_progress_table m_in_progress;
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c_map m_map;
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/**
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Relations that contain facts
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*/
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decl_set m_non_empty_rels;
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ast_counter m_head_occurrence_ctr;
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ast_ref_vector m_pinned;
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bool is_unbound_argument(rule * r, unsigned head_index);
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bool has_unbound_head_var(rule * r);
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void detect_tasks(unsigned rule_index);
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void add_task(func_decl * pred, unsigned arg_index);
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void try_compress(unsigned rule_index);
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void add_decompression_rules(unsigned rule_index);
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void mk_decompression_rule(rule * r, unsigned tail_index, unsigned arg_index, rule_ref& res);
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void add_decompression_rule(rule * r, unsigned tail_index, unsigned arg_index);
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void replace_by_decompression_rule(unsigned rule_index, unsigned tail_index, unsigned arg_index);
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void reset();
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public:
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mk_unbound_compressor(context & ctx);
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rule_set * operator()(rule_set const & source, model_converter_ref& mc, proof_converter_ref& pc);
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};
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};
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#endif /* _DL_MK_UNBOUND_COMPRESSOR_H_ */
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