#include "simgrid_config.h"
#include <stdio.h>
+#include <stdbool.h>
#ifndef WIN32
#include <sys/mman.h>
#endif
#include "msg/datatypes.h"
#include "xbt/strbuff.h"
#include "xbt/parmap.h"
+#include "mc_mmu.h"
+#include "mc_page_store.h"
+#include "mc_interface.h"
+
+SG_BEGIN_DECL()
typedef struct s_dw_frame s_dw_frame_t, *dw_frame_t;
typedef struct s_mc_function_index_item s_mc_function_index_item_t, *mc_function_index_item_t;
/****************************** Snapshots ***********************************/
-#define NB_REGIONS 3 /* binary data (data + BSS) (type = 2), libsimgrid data (data + BSS) (type = 1), std_heap (type = 0)*/
+#define NB_REGIONS 3 /* binary data (data + BSS) (type = 2), libsimgrid data (data + BSS) (type = 1), std_heap (type = 0)*/
+/** @brief Copy/snapshot of a given memory region
+ *
+ * Two types of region snapshots exist:
+ * <ul>
+ * <li>flat/dense snapshots are a simple copy of the region;</li>
+ * <li>sparse/per-page snapshots are snaapshots which shared
+ * identical pages.</li>
+ * </ul>
+ */
typedef struct s_mc_mem_region{
- // Real address:
+ /** @brief Virtual address of the region in the simulated process */
void *start_addr;
- // Copy of the datra:
+
+ /** @brief Permanent virtual address of the region
+ *
+ * This is usually the same address as the simuilated process address.
+ * However, when using SMPI privatization of global variables,
+ * each SMPI process has its own set of global variables stored
+ * at a different virtual address. The scheduler maps those region
+ * on the region of the global variables.
+ *
+ * */
+ void *permanent_addr;
+
+ /** @brief Copy of the snapshot for flat snapshots regions (NULL otherwise) */
void *data;
- // Size of the data region:
+
+ /** @brief Size of the data region in bytes */
size_t size;
- // For per-page snapshots, this is an array to the number of
+
+ /** @brief Pages indices in the page store for per-page snapshots (NULL otherwise) */
size_t* page_numbers;
+
} s_mc_mem_region_t, *mc_mem_region_t;
+static inline __attribute__ ((always_inline))
+bool mc_region_contain(mc_mem_region_t region, void* p)
+{
+ return p >= region->start_addr &&
+ p < (void*)((char*) region->start_addr + region->size);
+}
+
/** Ignored data
*
* Some parts of the snapshot are ignored by zeroing them out: the real
xbt_dynar_t to_ignore;
uint64_t hash;
xbt_dynar_t ignored_data;
-} s_mc_snapshot_t, *mc_snapshot_t;
+} s_mc_snapshot_t;
+
+/** @brief Process index used when no process is available
+ *
+ * The expected behaviour is that if a process index is needed it will fail.
+ * */
+#define MC_NO_PROCESS_INDEX -1
+
+/** @brief Process index when any process is suitable
+ *
+ * We could use a special negative value in the future.
+ */
+#define MC_ANY_PROCESS_INDEX 0
+
+mc_mem_region_t mc_get_snapshot_region(void* addr, mc_snapshot_t snapshot, int process_index);
+
+static inline __attribute__ ((always_inline))
+mc_mem_region_t mc_get_region_hinted(void* addr, mc_snapshot_t snapshot, int process_index, mc_mem_region_t region)
+{
+ if (mc_region_contain(region, addr))
+ return region;
+ else
+ return mc_get_snapshot_region(addr, snapshot, process_index);
+}
/** Information about a given stack frame
*
typedef struct s_mc_snapshot_stack{
xbt_dynar_t local_variables;
xbt_dynar_t stack_frames; // mc_stack_frame_t
+ int process_index;
}s_mc_snapshot_stack_t, *mc_snapshot_stack_t;
typedef struct s_mc_global_t{
size_t size;
}s_mc_checkpoint_ignore_region_t, *mc_checkpoint_ignore_region_t;
-SG_BEGIN_DECL()
-
-inline static void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot) {
- if(snapshot==NULL)
- xbt_die("snapshot is NULL");
- xbt_mheap_t heap = (xbt_mheap_t)snapshot->regions[0]->data;
- return heap->breakval;
-}
+static void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot);
-mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall);
mc_snapshot_t MC_take_snapshot(int num_state);
void MC_restore_snapshot(mc_snapshot_t);
void MC_free_snapshot(mc_snapshot_t);
size_t* mc_take_page_snapshot_region(void* data, size_t page_count, uint64_t* pagemap, size_t* reference_pages);
void mc_free_page_snapshot_region(size_t* pagenos, size_t page_count);
-void mc_restore_page_snapshot_region(mc_mem_region_t region, size_t page_count, uint64_t* pagemap, mc_mem_region_t reference_region);
+void mc_restore_page_snapshot_region(void* start_addr, size_t page_count, size_t* pagenos, uint64_t* pagemap, size_t* reference_pagenos);
-mc_mem_region_t mc_region_new_sparse(int type, void *start_addr, size_t size, mc_mem_region_t ref_reg);
+mc_mem_region_t mc_region_new_sparse(int type, void *start_addr, void* data_addr, size_t size, mc_mem_region_t ref_reg);
+void MC_region_destroy(mc_mem_region_t reg);
void mc_region_restore_sparse(mc_mem_region_t reg, mc_mem_region_t ref_reg);
void mc_softdirty_reset();
-typedef struct s_mc_pages_store s_mc_pages_store_t, * mc_pages_store_t;
-mc_pages_store_t mc_pages_store_new();
+static inline __attribute__((always_inline))
+bool mc_snapshot_region_linear(mc_mem_region_t region) {
+ return !region || !region->data;
+}
+
+void* mc_snapshot_read_fragmented(void* addr, mc_mem_region_t region, void* target, size_t size);
+
+void* mc_snapshot_read(void* addr, mc_snapshot_t snapshot, int process_index, void* target, size_t size);
+int mc_snapshot_region_memcmp(
+ void* addr1, mc_mem_region_t region1,
+ void* addr2, mc_mem_region_t region2, size_t size);
+int mc_snapshot_memcmp(
+ void* addr1, mc_snapshot_t snapshot1,
+ void* addr2, mc_snapshot_t snapshot2, int process_index, size_t size);
-void* mc_snapshot_read_region(void* addr, mc_mem_region_t region, void* target, size_t size);
-void* mc_snapshot_read(void* addr, mc_snapshot_t snapshot, void* target, size_t size);
+static void* mc_snapshot_read_pointer(void* addr, mc_snapshot_t snapshot, int process_index);
/** @brief State of the model-checker (global variables for the model checker)
*
extern mc_model_checker_t mc_model_checker;
-void* mc_translate_address_region(uintptr_t addr, mc_mem_region_t region);
-
-/** \brief Translate a pointer from process address space to snapshot address space
- *
- * The address space contains snapshot of the main/application memory:
- * this function finds the address in a given snaphot for a given
- * real/application address.
- *
- * For read only memory regions and other regions which are not int the
- * snapshot, the address is not changed.
- *
- * \param addr Application address
- * \param snapshot The snapshot of interest (if NULL no translation is done)
- * \return Translated address in the snapshot address space
- * */
-void* mc_translate_address(uintptr_t addr, mc_snapshot_t snapshot);
-
-/** \brief Translate a pointer from the snapshot address space to the application address space
- *
- * This is the inverse of mc_translate_address.
- *
- * Does not work for per-page snapshot, we change the logic to handle this.
- *
- * \param addr Address in the snapshot address space
- * \param snapsot Snapshot of interest (if NULL no translation is done)
- * \return Translated address in the application address space
- */
-uintptr_t mc_untranslate_address(void* addr, mc_snapshot_t snapshot);
-
extern xbt_dynar_t mc_checkpoint_ignore;
/********************************* MC Global **********************************/
void MC_show_deadlock(smx_simcall_t req);
void MC_show_stack_safety(xbt_fifo_t stack);
void MC_dump_stack_safety(xbt_fifo_t stack);
-int SIMIX_pre_mc_random(smx_simcall_t simcall, int min, int max);
extern xbt_fifo_t mc_stack;
int get_search_interval(xbt_dynar_t list, void *ref, int *min, int *max);
/* Normally the system should operate in std, for switching to raw mode */
/* you must wrap the code between MC_SET_RAW_MODE and MC_UNSET_RAW_MODE */
-extern void *std_heap;
-extern void *mc_heap;
+extern xbt_mheap_t std_heap;
+extern xbt_mheap_t mc_heap;
/* FIXME: Horrible hack! because the mmalloc library doesn't provide yet of */
extern __thread double mc_snapshot_comparison_time;
int snapshot_compare(void *state1, void *state2);
-int SIMIX_pre_mc_compare_snapshots(smx_simcall_t simcall, mc_snapshot_t s1, mc_snapshot_t s2);
void print_comparison_times(void);
//#define MC_DEBUG 1
}s_mc_visited_state_t, *mc_visited_state_t;
extern xbt_dynar_t visited_states;
-int is_visited_state(void);
+mc_visited_state_t is_visited_state(void);
void visited_state_free(mc_visited_state_t state);
void visited_state_free_voidp(void *s);
mc_expression_t locations;
} s_mc_location_list_t, *mc_location_list_t;
-uintptr_t mc_dwarf_resolve_location(mc_expression_t expression, mc_object_info_t object_info, unw_cursor_t* c, void* frame_pointer_address, mc_snapshot_t snapshot);
-uintptr_t mc_dwarf_resolve_locations(mc_location_list_t locations, mc_object_info_t object_info, unw_cursor_t* c, void* frame_pointer_address, mc_snapshot_t snapshot);
+uintptr_t mc_dwarf_resolve_location(mc_expression_t expression, mc_object_info_t object_info, unw_cursor_t* c, void* frame_pointer_address, mc_snapshot_t snapshot, int process_index);
+uintptr_t mc_dwarf_resolve_locations(mc_location_list_t locations, mc_object_info_t object_info, unw_cursor_t* c, void* frame_pointer_address, mc_snapshot_t snapshot, int process_index);
void mc_dwarf_expression_clear(mc_expression_t expression);
void mc_dwarf_expression_init(mc_expression_t expression, size_t len, Dwarf_Op* ops);
dw_type_t full_type; // The same (but more complete) type
};
-void* mc_member_resolve(const void* base, dw_type_t type, dw_type_t member, mc_snapshot_t snapshot);
-void* mc_member_snapshot_resolve(const void* base, dw_type_t type, dw_type_t member, mc_snapshot_t snapshot);
+void* mc_member_resolve(const void* base, dw_type_t type, dw_type_t member, mc_snapshot_t snapshot, int process_index);
typedef struct s_dw_variable{
Dwarf_Off dwarf_offset; /* Global offset of the field. */
void* frame_base;
mc_snapshot_t snapshot;
mc_object_info_t object_info;
+ int process_index;
} s_mc_expression_state_t, *mc_expression_state_t;
int mc_dwarf_execute_expression(size_t n, const Dwarf_Op* ops, mc_expression_state_t state);
void *data;
}s_mc_comm_pattern_t, *mc_comm_pattern_t;
+extern xbt_dynar_t initial_communications_pattern;
extern xbt_dynar_t communications_pattern;
extern xbt_dynar_t incomplete_communications_pattern;
* */
uint64_t mc_hash_processes_state(int num_state, xbt_dynar_t stacks);
+/* *********** Snapshot *********** */
+
+static inline __attribute__((always_inline))
+void* mc_translate_address_region(uintptr_t addr, mc_mem_region_t region)
+{
+ size_t pageno = mc_page_number(region->start_addr, (void*) addr);
+ size_t snapshot_pageno = region->page_numbers[pageno];
+ const void* snapshot_page = mc_page_store_get_page(mc_model_checker->pages, snapshot_pageno);
+ return (char*) snapshot_page + mc_page_offset((void*) addr);
+}
+
+/** \brief Translate a pointer from process address space to snapshot address space
+ *
+ * The address space contains snapshot of the main/application memory:
+ * this function finds the address in a given snaphot for a given
+ * real/application address.
+ *
+ * For read only memory regions and other regions which are not int the
+ * snapshot, the address is not changed.
+ *
+ * \param addr Application address
+ * \param snapshot The snapshot of interest (if NULL no translation is done)
+ * \return Translated address in the snapshot address space
+ * */
+static inline __attribute__((always_inline))
+void* mc_translate_address(uintptr_t addr, mc_snapshot_t snapshot, int process_index)
+{
+
+ // If not in a process state/clone:
+ if (!snapshot) {
+ return (uintptr_t *) addr;
+ }
+
+ mc_mem_region_t region = mc_get_snapshot_region((void*) addr, snapshot, process_index);
+
+ xbt_assert(mc_region_contain(region, (void*) addr), "Trying to read out of the region boundary.");
+
+ if (!region) {
+ return (void *) addr;
+ }
+
+ // Flat snapshot:
+ else if (region->data) {
+ uintptr_t offset = addr - (uintptr_t) region->start_addr;
+ return (void *) ((uintptr_t) region->data + offset);
+ }
+
+ // Per-page snapshot:
+ else if (region->page_numbers) {
+ return mc_translate_address_region(addr, region);
+ }
+
+ else {
+ xbt_die("No data for this memory region");
+ }
+}
+
+static inline __attribute__ ((always_inline))
+ void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot) {
+ if(snapshot==NULL)
+ xbt_die("snapshot is NULL");
+ void** addr = &(std_heap->breakval);
+ return mc_snapshot_read_pointer(addr, snapshot, MC_ANY_PROCESS_INDEX);
+}
+
+static inline __attribute__ ((always_inline))
+void* mc_snapshot_read_pointer(void* addr, mc_snapshot_t snapshot, int process_index)
+{
+ void* res;
+ return *(void**) mc_snapshot_read(addr, snapshot, process_index, &res, sizeof(void*));
+}
+
+/** @brief Read memory from a snapshot region
+ *
+ * @param addr Process (non-snapshot) address of the data
+ * @param region Snapshot memory region where the data is located
+ * @param target Buffer to store the value
+ * @param size Size of the data to read in bytes
+ * @return Pointer where the data is located (target buffer of original location)
+ */
+static inline __attribute__((always_inline))
+void* mc_snapshot_read_region(void* addr, mc_mem_region_t region, void* target, size_t size)
+{
+ if (region==NULL)
+ return addr;
+
+ uintptr_t offset = (char*) addr - (char*) region->start_addr;
+
+ xbt_assert(mc_region_contain(region, addr),
+ "Trying to read out of the region boundary.");
+
+ // Linear memory region:
+ if (region->data) {
+ return (char*) region->data + offset;
+ }
+
+ // Fragmented memory region:
+ else if (region->page_numbers) {
+ // Last byte of the region:
+ void* end = (char*) addr + size - 1;
+ if( mc_same_page(addr, end) ) {
+ // The memory is contained in a single page:
+ return mc_translate_address_region((uintptr_t) addr, region);
+ } else {
+ // The memory spans several pages:
+ return mc_snapshot_read_fragmented(addr, region, target, size);
+ }
+ }
+
+ else {
+ xbt_die("No data available for this region");
+ }
+}
+
+static inline __attribute__ ((always_inline))
+void* mc_snapshot_read_pointer_region(void* addr, mc_mem_region_t region)
+{
+ void* res;
+ return *(void**) mc_snapshot_read_region(addr, region, &res, sizeof(void*));
+}
+
SG_END_DECL()
#endif
-
