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https://github.com/Z3Prover/z3
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71 lines
1.6 KiB
C++
71 lines
1.6 KiB
C++
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/*++
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Copyright (c) 2015 Microsoft Corporation
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--*/
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#include "ast/expr_substitution.h"
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#include "smt/params/smt_params.h"
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#include "ast/substitution/substitution.h"
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#include "ast/substitution/unifier.h"
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#include "ast/bv_decl_plugin.h"
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#include "ast/ast_pp.h"
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#include "ast/arith_decl_plugin.h"
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#include "ast/reg_decl_plugins.h"
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#include "ast/rewriter/th_rewriter.h"
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#include <iostream>
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expr* mk_bv_xor(bv_util& bv, expr* a, expr* b) {
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expr* args[2];
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args[0] = a;
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args[1] = b;
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return bv.mk_bv_xor(2, args);
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}
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expr* mk_bv_and(bv_util& bv, expr* a, expr* b) {
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expr* args[2];
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args[0] = a;
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args[1] = b;
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ast_manager& m = bv.get_manager();
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return m.mk_app(bv.get_family_id(), OP_BAND, 2, args);
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}
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void tst_expr_substitution() {
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memory::initialize(0);
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ast_manager m;
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reg_decl_plugins(m);
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bv_util bv(m);
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expr_ref a(m), b(m), c(m), d(m);
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expr_ref x(m);
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expr_ref new_a(m);
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proof_ref pr(m);
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x = m.mk_const(symbol("x"), bv.mk_sort(8));
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a = mk_bv_and(bv, mk_bv_xor(bv, x,bv.mk_numeral(8,8)), mk_bv_xor(bv,x,x));
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b = x;
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c = bv.mk_bv_sub(x, bv.mk_numeral(4, 8));
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expr_substitution subst(m);
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th_rewriter rw(m);
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std::cout << mk_pp(c, m) << "\n";
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// normalizing c does not help.
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rw(c, d, pr);
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std::cout << mk_pp(d, m) << "\n";
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// This portion diverges. It attempts to replace x by (bvadd #xfc x), which contains x.
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// subst.insert(b, d);
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// std::cout << mk_pp(a, m) << "\n";
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// rw.set_substitution(&subst);
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// enable_trace("th_rewriter_step");
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// rw(a, new_a, pr);
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// std::cout << mk_pp(new_a, m) << "\n";
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}
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