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cfd0486582
Exceptions caught by value incur needless cost in C++, most of them can be caught by const-reference, especially as nearly none are actually used. This could allow compiler generate a slightly more efficient code.
77 lines
1.4 KiB
C++
77 lines
1.4 KiB
C++
/*++
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Copyright (c) 2006 Microsoft Corporation
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Module Name:
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occurs.cpp
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Abstract:
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<abstract>
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Author:
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Leonardo de Moura (leonardo) 2007-06-07.
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Revision History:
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--*/
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#include "ast/occurs.h"
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#include "ast/for_each_expr.h"
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// -----------------------------------
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//
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// Occurs check
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//
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// -----------------------------------
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namespace occurs_namespace {
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struct found {};
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struct proc {
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expr * m_n;
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#define CHECK() { if (n == m_n) throw found(); }
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proc(expr * n):m_n(n) {}
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void operator()(var const * n) { CHECK(); }
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void operator()(app const * n) { CHECK(); }
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void operator()(quantifier const * n) { CHECK(); }
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};
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struct decl_proc {
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func_decl * m_d;
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decl_proc(func_decl * d):m_d(d) {}
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void operator()(var const * n) { }
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void operator()(app const * n) { if (n->get_decl() == m_d) throw found(); }
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void operator()(quantifier const * n) { }
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};
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};
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// Return true if n1 occurs in n2
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bool occurs(expr * n1, expr * n2) {
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occurs_namespace::proc p(n1);
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try {
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quick_for_each_expr(p, n2);
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}
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catch (const occurs_namespace::found &) {
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return true;
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}
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return false;
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}
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bool occurs(func_decl * d, expr * n) {
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occurs_namespace::decl_proc p(d);
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try {
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quick_for_each_expr(p, n);
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}
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catch (const occurs_namespace::found &) {
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return true;
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}
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return false;
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}
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