#include <stdint.h>
+#ifdef __cplusplus
#include <vector>
+#include <boost/array.hpp>
#include <boost/utility.hpp>
#include <boost/unordered_map.hpp>
#include <boost/unordered_set.hpp>
+#endif
#include <xbt.h>
-#include "mc_private.h"
#include "mc_mmu.h"
+#include "mc_forward.h"
+
+#ifndef MC_PAGE_STORE_H
+#define MC_PAGE_STORE_H
-#ifndef MC_PAGE_SNAPSHOT_H
-#define MC_PAGE_SNAPSHOT_H
+struct s_mc_pages_store;
+
+#ifdef __cplusplus
/** @brief Storage for snapshot memory pages
*
*
*/
struct s_mc_pages_store {
-private: // Types
+public: // Types
+#ifdef MC_PAGE_STORE_MD4
+ typedef boost::array<uint64_t,2> hash_type;
+#else
typedef uint64_t hash_type;
- typedef boost ::unordered_set<size_t> page_set_type;
+#endif
+private: // Types
+#ifdef MC_PAGE_STORE_MD4
+ // We are using a secure hash to identify a page.
+ // We assume there will not be any collision: we need to map a hash
+ // to a single page index.
+ typedef boost::unordered_map<hash_type, size_t> pages_map_type;
+#else
+ // We are using a cheap hash to index a page.
+ // We should expect collision and we need to associate multiple page indices
+ // to the same hash.
+ typedef boost::unordered_set<size_t> page_set_type;
typedef boost::unordered_map<hash_type, page_set_type> pages_map_type;
+#endif
private: // Fields:
- /** First page */
+ /** First page
+ *
+ * mc_page_store_get_page expects that this is the first field.
+ * */
void* memory_;
/** Number of available pages in virtual memory */
size_t capacity_;
* it is added to the `free_pages_` list and removed from the `hash_index_`.
*
* */
- void unref_page(size_t pageno) {
- if ((--this->page_counts_[pageno]) == 0) {
- this->remove_page(pageno);
- }
- }
+ void unref_page(size_t pageno);
/** @brief Increment the refcount for a given page
*
* changed since the previous cnapshot/restoration and we can avoid
* hashing the page, comparing byte-per-byte to candidates.
* */
- void ref_page(size_t pageno) {
- ++this->page_counts_[pageno];
- }
+ void ref_page(size_t pageno);
/** @brief Store a page in the page store */
size_t store_page(void* page);
* @param Number of the memory page in the store
* @return Start of the page
*/
- const void* get_page(size_t pageno) const {
- return mc_page_from_number(this->memory_, pageno);
- }
+ const void* get_page(size_t pageno) const;
public: // Debug/test methods
/** @brief Get the number of references for a page */
- size_t get_ref(size_t pageno) {
- return this->page_counts_[pageno];
- }
+ size_t get_ref(size_t pageno);
/** @brief Get the number of used pages */
- size_t size() {
- return this->top_index_ - this->free_pages_.size();
- }
+ size_t size();
/** @brief Get the capacity of the page store
*
* The capacity is expanded by a system call (mremap).
* */
- size_t capacity() {
- return this->capacity_;
- }
+ size_t capacity();
};
+inline __attribute__((always_inline))
+void s_mc_pages_store::unref_page(size_t pageno) {
+ if ((--this->page_counts_[pageno]) == 0) {
+ this->remove_page(pageno);
+ }
+}
+
+inline __attribute__((always_inline))
+void s_mc_pages_store::ref_page(size_t pageno) {
+ ++this->page_counts_[pageno];
+}
+
+inline __attribute__((always_inline))
+const void* s_mc_pages_store::get_page(size_t pageno) const {
+ return mc_page_from_number(this->memory_, pageno);
+}
+
+inline __attribute__((always_inline))
+size_t s_mc_pages_store::get_ref(size_t pageno) {
+ return this->page_counts_[pageno];
+}
+
+inline __attribute__((always_inline))
+size_t s_mc_pages_store::size() {
+ return this->top_index_ - this->free_pages_.size();
+}
+
+inline __attribute__((always_inline))
+size_t s_mc_pages_store::capacity() {
+ return this->capacity_;
+}
+
#endif
+SG_BEGIN_DECL()
+
+mc_pages_store_t mc_pages_store_new(void);
+void mc_pages_store_delete(mc_pages_store_t store);
+
+/**
+ */
+static inline __attribute__((always_inline))
+const void* mc_page_store_get_page(mc_pages_store_t page_store, size_t pageno)
+{
+ // This is page_store->memory_:
+ void* memory = *(void**)page_store;
+ return mc_page_from_number(memory, pageno);
+}
+
+SG_END_DECL()
+
+#endif
