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95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
/*++
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Copyright (c) 2006 Microsoft Corporation
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Module Name:
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expr_offset_map.h
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Abstract:
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A generic mapping from (expression, offset) to a value T.
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Author:
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Leonardo de Moura (leonardo) 2008-02-01.
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Revision History:
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--*/
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#ifndef _EXPR_OFFSET_MAP_H_
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#define _EXPR_OFFSET_MAP_H_
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#include"expr_offset.h"
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#include"vector.h"
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/**
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\brief A mapping from expr_offset to some value of type T.
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*/
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template<typename T>
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class expr_offset_map {
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struct data {
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T m_data;
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unsigned m_timestamp;
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data():m_timestamp(0) {}
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};
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vector<svector<data> > m_map;
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unsigned m_timestamp;
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public:
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expr_offset_map():
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m_timestamp(1) {}
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bool contains(expr_offset const & n) const {
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unsigned off = n.get_offset();
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if (off < m_map.size()) {
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svector<data> const & v = m_map[off];
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unsigned id = n.get_expr()->get_id();
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if (id < v.size())
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return v[id].m_timestamp == m_timestamp;
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}
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return false;
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}
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bool find(expr_offset const & n, T & r) const {
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unsigned off = n.get_offset();
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if (off < m_map.size()) {
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svector<data> const & v = m_map[off];
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unsigned id = n.get_expr()->get_id();
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if (id < v.size() && v[id].m_timestamp == m_timestamp) {
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r = v[id].m_data;
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return true;
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}
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}
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return false;
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}
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void insert(expr_offset const & n, T const & r) {
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unsigned off = n.get_offset();
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if (off >= m_map.size())
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m_map.resize(off+1, svector<data>());
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svector<data> & v = m_map[off];
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unsigned id = n.get_expr()->get_id();
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if (id >= v.size())
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v.resize(id+1);
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v[id].m_data = r;
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v[id].m_timestamp = m_timestamp;
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}
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void reset() {
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m_timestamp++;
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if (m_timestamp == UINT_MAX) {
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typename vector<svector<data> >::iterator it = m_map.begin();
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typename vector<svector<data> >::iterator end = m_map.end();
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for (; it != end; ++it) {
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svector<data> & v = *it;
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typename svector<data>::iterator it2 = v.begin();
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typename svector<data>::iterator end2 = v.end();
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for (; it2 != end2; ++it2)
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it2->m_timestamp = 0;
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}
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m_timestamp = 1;
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}
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}
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};
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#endif /* _EXPR_OFFSET_MAP_H_ */
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