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https://github.com/Z3Prover/z3
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125 lines
2.7 KiB
C++
125 lines
2.7 KiB
C++
/*++
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Copyright (c) 2006 Microsoft Corporation
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Module Name:
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region.cpp
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Abstract:
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Region/Arena memory manager
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Author:
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Leonardo de Moura (leonardo) 2006-09-18.
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Revision History:
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--*/
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#include"region.h"
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#ifdef Z3DEBUG
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void region::display_mem_stats(std::ostream & out) const {
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out << "num. objects: " << m_chuncks.size() << "\n";
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}
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#else
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#include"tptr.h"
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#include"debug.h"
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#include"memory_manager.h"
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#include"page.h"
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inline void region::allocate_page() {
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m_curr_page = allocate_default_page(m_curr_page, m_free_pages);
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m_curr_ptr = m_curr_page;
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m_curr_end_ptr = end_of_default_page(m_curr_page);
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}
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region::region() {
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m_curr_page = 0;
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m_curr_ptr = 0;
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m_curr_end_ptr = 0;
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m_free_pages = 0;
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m_mark = 0;
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allocate_page();
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}
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region::~region() {
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del_pages(m_curr_page);
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del_pages(m_free_pages);
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}
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void * region::allocate(size_t size) {
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char * new_curr_ptr = m_curr_ptr + size;
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if (new_curr_ptr < m_curr_end_ptr) {
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char * result = m_curr_ptr;
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m_curr_ptr = ALIGN(char *, new_curr_ptr);
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return result;
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}
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else if (size < DEFAULT_PAGE_SIZE) {
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allocate_page();
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char * result = m_curr_ptr;
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m_curr_ptr += size;
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m_curr_ptr = ALIGN(char *, m_curr_ptr);
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return result;
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}
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else {
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// big page
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m_curr_page = ::allocate_page(m_curr_page, size);
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char * result = m_curr_page;
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allocate_page();
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return result;
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}
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}
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inline void region::recycle_curr_page() {
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char * prev = prev_page(m_curr_page);
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recycle_page(m_curr_page, m_free_pages);
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m_curr_page = prev;
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}
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void region::reset() {
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while (m_curr_page != 0) {
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recycle_curr_page();
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}
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SASSERT(m_curr_page == 0);
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m_curr_ptr = 0;
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m_curr_end_ptr = 0;
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m_mark = 0;
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allocate_page();
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}
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void region::push_scope() {
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char * curr_page = m_curr_page;
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char * curr_ptr = m_curr_ptr;
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m_mark = new (*this) mark(curr_page, curr_ptr, m_mark);
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}
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void region::pop_scope() {
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SASSERT(m_mark);
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char * old_curr_page = m_mark->m_curr_page;
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SASSERT(is_default_page(old_curr_page));
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m_curr_ptr = m_mark->m_curr_ptr;
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m_mark = m_mark->m_prev_mark;
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while (m_curr_page != old_curr_page) {
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recycle_curr_page();
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}
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SASSERT(is_default_page(m_curr_page));
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m_curr_end_ptr = end_of_default_page(m_curr_page);
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}
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void region::display_mem_stats(std::ostream & out) const {
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unsigned n = 0;
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char * page = m_curr_page;
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while (page != 0) {
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n++;
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page = prev_page(page);
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}
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out << "num. pages: " << n << "\n";
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}
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#endif
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