X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/83a2c3a9dd2104f4db2f42a483b212f07aa39f6b..251bbe5068a2a7b23a23a4df11fc1b785dce6ff4:/src/mc/mc_private.h

diff --git a/src/mc/mc_private.h b/src/mc/mc_private.h
index 5395a1d80a..2d62c91dc7 100644
--- a/src/mc/mc_private.h
+++ b/src/mc/mc_private.h
@@ -9,6 +9,7 @@
 
 #include "simgrid_config.h"
 #include <stdio.h>
+#include <stdbool.h>
 #ifndef WIN32
 #include <sys/mman.h>
 #endif
@@ -28,6 +29,10 @@
 #include "msg/datatypes.h"
 #include "xbt/strbuff.h"
 #include "xbt/parmap.h"
+#include "mc_mmu.h"
+#include "mc_page_store.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;
@@ -43,8 +48,17 @@ typedef struct s_mc_mem_region{
   void *data;
   // Size of the data region:
   size_t size;
+  // For per-page snapshots, this is an array to the number of
+  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
@@ -69,6 +83,17 @@ typedef struct s_mc_snapshot{
   xbt_dynar_t ignored_data;
 } s_mc_snapshot_t, *mc_snapshot_t;
 
+mc_mem_region_t mc_get_snapshot_region(void* addr, mc_snapshot_t snapshot);
+
+static inline __attribute__ ((always_inline))
+mc_mem_region_t mc_get_region_hinted(void* addr, mc_snapshot_t snapshot, mc_mem_region_t region)
+{
+  if (mc_region_contain(region, addr))
+    return region;
+  else
+    return mc_get_snapshot_region(addr, snapshot);
+}
+
 /** Information about a given stack frame
  *
  */
@@ -85,8 +110,6 @@ typedef struct s_mc_stack_frame {
 
 typedef struct s_mc_snapshot_stack{
   xbt_dynar_t local_variables;
-  void *stack_pointer;
-  void *real_address;
   xbt_dynar_t stack_frames; // mc_stack_frame_t
 }s_mc_snapshot_stack_t, *mc_snapshot_stack_t;
 
@@ -105,42 +128,56 @@ typedef struct s_mc_checkpoint_ignore_region{
   size_t size;
 }s_mc_checkpoint_ignore_region_t, *mc_checkpoint_ignore_region_t;
 
-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);
 
-/** \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);
+int mc_important_snapshot(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.
+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);
+
+mc_mem_region_t mc_region_new_sparse(int type, void *start_addr, size_t size, mc_mem_region_t ref_reg);
+void mc_region_restore_sparse(mc_mem_region_t reg, mc_mem_region_t ref_reg);
+void mc_softdirty_reset();
+
+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, void* target, size_t size);
+int mc_snapshot_region_memcp(
+  void* addr1, mc_mem_region_t region1,
+  void* addr2, mc_mem_region_t region2, size_t size);
+int mc_snapshot_memcp(
+  void* addr1, mc_snapshot_t snapshot1,
+  void* addr2, mc_snapshot_t snapshot2, size_t size);
+
+static void* mc_snapshot_read_pointer(void* addr, mc_snapshot_t snapshot);
+
+/** @brief State of the model-checker (global variables for the model checker)
  *
- * \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
+ *  Each part of the state of the model chercker represented as a global
+ *  variable prevents some sharing between snapshots and must be ignored.
+ *  By moving as much state as possible in this structure allocated
+ *  on the model-chercker heap, we avoid those issues.
  */
-uintptr_t mc_untranslate_address(void* addr, mc_snapshot_t snapshot);
+typedef struct s_mc_model_checker {
+  // This is the parent snapshot of the current state:
+  mc_snapshot_t parent_snapshot;
+  mc_pages_store_t pages;
+  int fd_clear_refs;
+  int fd_pagemap;
+} s_mc_model_checker_t, *mc_model_checker_t;
+
+extern mc_model_checker_t mc_model_checker;
 
 extern xbt_dynar_t mc_checkpoint_ignore;
 
@@ -477,7 +514,6 @@ struct s_dw_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);
 
 typedef struct s_dw_variable{
   Dwarf_Off dwarf_offset; /* Global offset of the field. */
@@ -619,5 +655,118 @@ bool mc_address_test(mc_address_set_t p, const void* value);
  * */
 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)
+{
+
+  // 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);
+
+  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 = &((xbt_mheap_t)std_heap)->breakval;
+  return mc_snapshot_read_pointer(addr, snapshot);
+}
+
+static inline __attribute__ ((always_inline))
+void* mc_snapshot_read_pointer(void* addr, mc_snapshot_t snapshot)
+{
+  void* res;
+  return *(void**) mc_snapshot_read(addr, snapshot, &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)
+{
+  uintptr_t offset = (uintptr_t) addr - (uintptr_t) region->start_addr;
+
+  xbt_assert(addr >= region->start_addr && (char*) addr+size < (char*)region->start_addr+region->size,
+    "Trying to read out of the region boundary.");
+
+  // Linear memory region:
+  if (region->data) {
+    return (void*) ((uintptr_t) region->data + offset);
+  }
+
+  // Fragmented memory region:
+  else if (region->page_numbers) {
+    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");
+  }
+}
+
+
+SG_END_DECL()
+
 #endif