/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
+#include <stdbool.h>
+
#include "mc_private.h"
#include "mc_mmu.h"
+#include "mc_page_store.h"
mc_mem_region_t mc_get_snapshot_region(void* addr, mc_snapshot_t snapshot)
{
return NULL;
}
+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) {
// Per-page snapshot:
else if (region->page_numbers) {
- 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);
+ return mc_translate_address_region(addr, region);
}
else {
}
}
-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);
- return mc_translate_address_region(addr, region);
-}
-
/** @brief Read memory from a snapshot region broken across fragmented pages
*
* @param addr Process (non-snapshot) address of the data
}
}
+/** Compare memory between snapshots (with known regions)
+ *
+ * @param addr1 Address in the first snapshot
+ * @param snapshot2 Region of the address in the first snapshot
+ * @param addr2 Address in the second snapshot
+ * @param snapshot2 Region of the address in the second snapshot
+ * @return same as memcmp
+ * */
int mc_snapshot_region_memcp(
void* addr1, mc_mem_region_t region1,
void* addr2, mc_mem_region_t region2, size_t size)
{
- void* buffer1 = mc_snapshot_read_region(addr1, region1, alloca(size), size);
- void* buffer2 = mc_snapshot_read_region(addr2, region2, alloca(size), size);
+ // Using alloca() for large allocations may trigger stack overflow:
+ // use malloc if the buffer is too big.
+
+ bool stack_alloc = size < 64;
+ void* buffer = stack_alloc ? alloca(2*size) : malloc(2*size);
+ void* buffer1 = mc_snapshot_read_region(addr1, region1, buffer, size);
+ void* buffer2 = mc_snapshot_read_region(addr2, region2, (char*) buffer + size, size);
+ int res;
if (buffer1 == buffer2) {
- return 0;
+ res = 0;
+ } else {
+ res = memcmp(buffer1, buffer2, size);
+ }
+ if (!stack_alloc) {
+ free(buffer);
}
- return memcmp(buffer1, buffer2, size);
+ return res;
}
+/** Compare memory between snapshots
+ *
+ * @param addr1 Address in the first snapshot
+ * @param snapshot1 First snapshot
+ * @param addr2 Address in the second snapshot
+ * @param snapshot2 Second snapshot
+ * @return same as memcmp
+ * */
int mc_snapshot_memcp(
void* addr1, mc_snapshot_t snapshot1,
void* addr2, mc_snapshot_t snapshot2, size_t size)
{
- void* buffer1 = mc_snapshot_read(addr1, snapshot1, alloca(size), size);
- void* buffer2 = mc_snapshot_read(addr2, snapshot2, alloca(size), size);
- if (buffer1 == buffer2) {
- return 0;
- }
- return memcmp(buffer1, buffer2, size);
+ mc_mem_region_t region1 = mc_get_snapshot_region(addr1, snapshot1);
+ mc_mem_region_t region2 = mc_get_snapshot_region(addr2, snapshot2);
+ return mc_snapshot_region_memcp(addr1, region1, addr2, region2, size);
}