48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
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/*
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include "util/hash.h"
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#include "util/int64.h"
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#include "kernel/environment.h"
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namespace lean {
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struct fingerprint_ext : public environment_extension {
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uint64 m_fingerprint;
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fingerprint_ext():m_fingerprint(0) {}
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};
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struct fingerprint_ext_reg {
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unsigned m_ext_id;
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fingerprint_ext_reg() { m_ext_id = environment::register_extension(std::make_shared<fingerprint_ext>()); }
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};
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static fingerprint_ext_reg * g_ext = nullptr;
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static fingerprint_ext const & get_extension(environment const & env) {
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return static_cast<fingerprint_ext const &>(env.get_extension(g_ext->m_ext_id));
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}
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static environment update(environment const & env, fingerprint_ext const & ext) {
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return env.update(g_ext->m_ext_id, std::make_shared<fingerprint_ext>(ext));
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}
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environment update_fingerprint(environment const & env, unsigned h) {
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fingerprint_ext ext = get_extension(env);
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ext.m_fingerprint = hash(ext.m_fingerprint, static_cast<uint64>(h));
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return update(env, ext);
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}
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uint64 get_fingerprint(environment const & env) {
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return get_extension(env).m_fingerprint;
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}
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void initialize_fingerprint() {
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g_ext = new fingerprint_ext_reg();
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}
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void finalize_fingerprint() {
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delete g_ext;
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}
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}
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