Z3 sources

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

lib/region.h

@@ -0,0 +1,121 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    region.h
+
+Abstract:
+
+    Region/Arena memory manager
+
+Author:
+
+    Leonardo de Moura (leonardo) 2006-09-13.
+
+Revision History:
+
+--*/
+#ifndef _REGION_H_
+#define _REGION_H_
+#include<cstdlib>
+#include<iostream>
+
+#ifdef Z3DEBUG
+
+#include"vector.h"
+
+class region {
+    ptr_vector<char> m_chuncks;
+    unsigned_vector  m_scopes;
+public:
+    ~region() {
+        reset();
+    }
+
+    void * allocate(size_t size) {
+        char * r = alloc_svect(char, size);
+        m_chuncks.push_back(r);
+        return r;
+    }
+
+    void reset() {
+        ptr_vector<char>::iterator it  = m_chuncks.begin();
+        ptr_vector<char>::iterator end = m_chuncks.end();
+        for (; it != end; ++it) {
+            dealloc_svect(*it);
+        }
+        m_chuncks.reset();
+        m_scopes.reset();
+    }
+
+    void push_scope() {
+        m_scopes.push_back(m_chuncks.size());
+    }
+
+    void pop_scope() {
+        unsigned old_size = m_scopes.back();
+        m_scopes.pop_back();
+        ptr_vector<char>::iterator it  = m_chuncks.begin() + old_size;
+        ptr_vector<char>::iterator end = m_chuncks.end();
+        for (; it != end; ++it) {
+            dealloc_svect(*it);
+        }
+        m_chuncks.shrink(old_size);
+    }
+    
+    void pop_scope(unsigned num_scopes) {
+        for (unsigned i = 0; i < num_scopes; i++) {
+            pop_scope();
+        }
+    }
+
+    void display_mem_stats(std::ostream & out) const;
+};
+
+#else
+
+/**
+\brief Implement explicit region memory manager.
+*/
+class region {
+    struct mark {
+        char * m_curr_page;
+        char * m_curr_ptr;
+        mark * m_prev_mark;
+        mark(char * page, char * ptr, mark * m):m_curr_page(page), m_curr_ptr(ptr), m_prev_mark(m) {}
+    };
+    char *   m_curr_page;
+    char *   m_curr_ptr;     //!< Next free space in the current page.
+    char *   m_curr_end_ptr; //!< Point to the end of the current page.
+    char *   m_free_pages;
+    mark *   m_mark;
+    void allocate_page();
+    void recycle_curr_page();
+public:
+    region();
+    ~region();
+    void * allocate(size_t size);
+    void reset();
+    void push_scope();
+    void pop_scope();
+    void pop_scope(unsigned num_scopes) {
+        for (unsigned i = 0; i < num_scopes; i++) {
+            pop_scope();
+        }
+    }
+    void display_mem_stats(std::ostream & out) const;
+};
+
+#endif
+
+inline void * operator new(size_t s, region & r) { return r.allocate(s); }
+
+inline void * operator new[](size_t s, region & r) { return r.allocate(s); }
+
+inline void operator delete(void *, region & ) { /* do nothing */ }
+
+inline void operator delete[](void *, region & ) { /* do nothing */ }
+
+#endif /* _REGION_H_ */
+