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https://github.com/Z3Prover/z3
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87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
/*++
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Copyright (c) 2012 Microsoft Corporation
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Module Name:
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replace_proof_converter.cpp
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Abstract:
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Proof converter that replaces asserted by sub-proof.
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Author:
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Nikolaj Bjorner (nbjorner) 2012-9-16
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Revision History:
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--*/
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#include "replace_proof_converter.h"
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#include "expr_functors.h"
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#include "ast_pp.h"
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#include "for_each_expr.h"
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/**
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\brief Replace expressions by other expressions.
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replace_map is caching, so inserting src |-> dst has no effect if
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src is a sub-expression of something that has already been visited.
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The assumption is that proof replacements are inserted into
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the replace_proof_converter in the order that they are introduced, so
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there are no such clashes.
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map_proc is used as expr_replacer behaves differently
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when proof mode is turned on.
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*/
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class replace_map : public map_proc {
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public:
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replace_map(ast_manager& m): map_proc(m) {}
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void insert(expr* src, expr* dst) {
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m_map.insert(src, dst, 0);
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}
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void operator()(var* v) { visit(v); }
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void operator()(app* a) { if (!get_expr(a)) { reconstruct(a); } }
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void operator()(quantifier* q) { visit(q); }
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void apply(expr_ref& e) {
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for_each_expr(*this, e);
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e = get_expr(e);
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}
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};
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void replace_proof_converter::operator()(ast_manager & m, unsigned num_source,
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proof * const * source, proof_ref & result) {
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SASSERT(num_source == 1);
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replace_map replace(m);
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proof_ref p(m);
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expr_ref tmp(source[0], m), e(m), f(m);
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// apply the substitution to the prefix before inserting it.
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for (unsigned i = 0; i < m_proofs.size(); ++i) {
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p = m_proofs[i].get();
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e = p;
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replace.apply(e);
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f = m.mk_asserted(m.get_fact(p));
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replace.insert(f, e);
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TRACE("proof_converter", tout << f->get_id() << " " << mk_pp(f, m) <<
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"\n|-> " << mk_pp(e, m) << "\n";);
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}
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replace.apply(tmp);
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TRACE("proof_converter", tout << mk_pp(source[0], m) << "\n";
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tout << mk_pp(tmp.get(), m) << "\n";);
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result = to_app(tmp);
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}
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proof_converter * replace_proof_converter::translate(ast_translation & translator) {
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replace_proof_converter* rp = alloc(replace_proof_converter, m);
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for (unsigned i = 0; i < m_proofs.size(); ++i) {
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rp->insert(translator(m_proofs[i].get()));
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}
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return rp;
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}
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