X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/6feb6e8bbb970e26a20a7c74234425bc7ebe0f6f..43c98702056fac491ffe054cdba3f36e4c8dbf3a:/src/mc/mc_private.h diff --git a/src/mc/mc_private.h b/src/mc/mc_private.h index 12783b6af3..8911c1458b 100644 --- a/src/mc/mc_private.h +++ b/src/mc/mc_private.h @@ -1,4 +1,4 @@ -/* Copyright (c) 2007-2013. The SimGrid Team. +/* Copyright (c) 2007-2014. The SimGrid Team. * All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it @@ -9,6 +9,7 @@ #include "simgrid_config.h" #include +#include #ifndef WIN32 #include #endif @@ -21,35 +22,114 @@ #include "xbt/function_types.h" #include "xbt/mmalloc.h" #include "../simix/smx_private.h" +#include "../xbt/mmalloc/mmprivate.h" #include "xbt/automaton.h" #include "xbt/hash.h" #include "msg/msg.h" #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: + *
    + *
  • flat/dense snapshots are a simple copy of the region;
    • + *
  • sparse/per-page snapshots are snaapshots which shared + * identical pages.
    • + *
+ */ typedef struct s_mc_mem_region{ + /** @brief Virtual address of the region in the simulated process */ void *start_addr; + + /** @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; + + /** @brief Size of the data region in bytes */ size_t size; + + /** @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 + * values is stored here. + * */ +typedef struct s_mc_snapshot_ignored_data { + void* start; + size_t size; + void* data; +} s_mc_snapshot_ignored_data_t, *mc_snapshot_ignored_data_t; + typedef struct s_mc_snapshot{ size_t heap_bytes_used; mc_mem_region_t regions[NB_REGIONS]; - int nb_processes; + xbt_dynar_t enabled_processes; + mc_mem_region_t* privatization_regions; + int privatization_index; size_t *stack_sizes; xbt_dynar_t stacks; xbt_dynar_t to_ignore; uint64_t hash; -} s_mc_snapshot_t, *mc_snapshot_t; + xbt_dynar_t ignored_data; +} 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 * @@ -67,9 +147,8 @@ 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 + int process_index; }s_mc_snapshot_stack_t, *mc_snapshot_stack_t; typedef struct s_mc_global_t{ @@ -87,11 +166,57 @@ typedef struct s_mc_checkpoint_ignore_region{ size_t size; }s_mc_checkpoint_ignore_region_t, *mc_checkpoint_ignore_region_t; -mc_snapshot_t SIMIX_pre_mc_snapshot(smx_simcall_t simcall); +static void* mc_snapshot_get_heap_end(mc_snapshot_t snapshot); + mc_snapshot_t MC_take_snapshot(int num_state); void MC_restore_snapshot(mc_snapshot_t); void MC_free_snapshot(mc_snapshot_t); +int mc_important_snapshot(mc_snapshot_t snapshot); + +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(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, 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(); + +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); + +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) + * + * 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. + */ +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; /********************************* MC Global **********************************/ @@ -110,8 +235,9 @@ void MC_wait_for_requests(void); 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); -void MC_init(void); -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); /********************************* Requests ***********************************/ @@ -129,6 +255,8 @@ char *MC_request_get_dot_output(smx_simcall_t req, int value); /******************************** States **************************************/ +extern mc_global_t initial_global_state; + /* Possible exploration status of a process in a state */ typedef enum { MC_NOT_INTERLEAVE=0, /* Do not interleave (do not execute) */ @@ -190,8 +318,8 @@ void MC_print_statistics(mc_stats_t); /* 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 *raw_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 */ @@ -206,8 +334,8 @@ extern void *raw_heap; /* size_t bytes_free; /\* Byte total of chunks in the free list. *\/ */ /* }; */ -#define MC_SET_RAW_MEM mmalloc_set_current_heap(raw_heap) -#define MC_UNSET_RAW_MEM mmalloc_set_current_heap(std_heap) +#define MC_SET_MC_HEAP mmalloc_set_current_heap(mc_heap) +#define MC_SET_STD_HEAP mmalloc_set_current_heap(std_heap) /******************************* MEMORY MAPPINGS ***************************/ @@ -259,13 +387,12 @@ extern __thread mc_comparison_times_t mc_comp_times; 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 #define MC_VERBOSE 1 -/********************************** DPOR for safety property **************************************/ +/********************************** Safety verification **************************************/ typedef enum { e_mc_reduce_unset, @@ -274,12 +401,10 @@ typedef enum { } e_mc_reduce_t; extern e_mc_reduce_t mc_reduce_kind; -extern mc_global_t initial_state_safety; -extern xbt_fifo_t mc_stack_safety; extern xbt_dict_t first_enabled_state; -void MC_dpor_init(void); -void MC_dpor(void); +void MC_pre_modelcheck_safety(void); +void MC_modelcheck_safety(void); typedef struct s_mc_visited_state{ mc_snapshot_t system_state; @@ -289,13 +414,14 @@ typedef struct s_mc_visited_state{ int other_num; // dot_output for }s_mc_visited_state_t, *mc_visited_state_t; +extern xbt_dynar_t visited_states; +mc_visited_state_t is_visited_state(void); +void visited_state_free(mc_visited_state_t state); +void visited_state_free_voidp(void *s); -/********************************** Double-DFS for liveness property **************************************/ +/********************************** Liveness verification **************************************/ -extern xbt_fifo_t mc_stack_liveness; -extern mc_global_t initial_state_liveness; extern xbt_automaton_t _mc_property_automaton; -extern int compare; typedef struct s_mc_pair{ int num; @@ -325,11 +451,14 @@ void mc_pair_free_voidp(void *p); mc_visited_pair_t MC_visited_pair_new(int pair_num, xbt_automaton_state_t automaton_state, xbt_dynar_t atomic_propositions); void MC_visited_pair_delete(mc_visited_pair_t p); -void MC_ddfs_init(void); -void MC_ddfs(void); +void MC_pre_modelcheck_liveness(void); +void MC_modelcheck_liveness(void); void MC_show_stack_liveness(xbt_fifo_t stack); void MC_dump_stack_liveness(xbt_fifo_t stack); +extern xbt_dynar_t visited_pairs; +int is_visited_pair(mc_visited_pair_t pair, int pair_num, xbt_automaton_state_t automaton_state, xbt_dynar_t atomic_propositions); + /********************************** Variables with DWARF **********************************/ @@ -341,10 +470,10 @@ struct s_mc_object_info { char *start_exec, *end_exec; // Executable segment char *start_rw, *end_rw; // Read-write segment char *start_ro, *end_ro; // read-only segment - xbt_dict_t local_variables; // xbt_dict_t + xbt_dict_t subprograms; // xbt_dict_t xbt_dynar_t global_variables; // xbt_dynar_t xbt_dict_t types; // xbt_dict_t - xbt_dict_t types_by_name; // xbt_dict_t (full defined type only) + xbt_dict_t full_types_by_name; // xbt_dict_t (full defined type only) // Here we sort the minimal information for an efficient (and cache-efficient) // lookup of a function given an instruction pointer. @@ -366,92 +495,130 @@ mc_object_info_t MC_ip_find_object_info(void* ip); extern mc_object_info_t mc_libsimgrid_info; extern mc_object_info_t mc_binary_info; +extern mc_object_info_t mc_object_infos[2]; +extern size_t mc_object_infos_size; void MC_find_object_address(memory_map_t maps, mc_object_info_t result); void MC_post_process_types(mc_object_info_t info); +void MC_post_process_object_info(mc_object_info_t info); -typedef enum { - e_dw_loclist, - e_dw_register, - e_dw_bregister_op, - e_dw_lit, - e_dw_fbregister_op, - e_dw_piece, - e_dw_arithmetic, - e_dw_plus_uconst, - e_dw_compose, - e_dw_deref, - e_dw_uconstant, - e_dw_sconstant, - e_dw_unsupported -} e_dw_location_type; - -typedef struct s_dw_location{ - e_dw_location_type type; - union{ - - xbt_dynar_t loclist; - - int reg; - - struct{ - unsigned int reg; - int offset; - }breg_op; - - unsigned int lit; - - int fbreg_op; - - int piece; - - unsigned short int deref_size; - - xbt_dynar_t compose; - - char *arithmetic; - - struct{ - int bytes; - long unsigned int value; - }uconstant; - - struct{ - int bytes; - long signed int value; - }sconstant; - - unsigned int plus_uconst; - - }location; -}s_dw_location_t, *dw_location_t; - -typedef struct s_dw_location_entry{ - long lowpc; - long highpc; - dw_location_t location; -}s_dw_location_entry_t, *dw_location_entry_t; +// ***** Expressions + +/** \brief a DWARF expression with optional validity contraints */ +typedef struct s_mc_expression { + size_t size; + Dwarf_Op* ops; + // Optional validity: + void* lowpc, *highpc; +} s_mc_expression_t, *mc_expression_t; + +/** A location list (list of location expressions) */ +typedef struct s_mc_location_list { + size_t size; + mc_expression_t locations; +} s_mc_location_list_t, *mc_location_list_t; + +/** A location is either a location in memory of a register location + * + * Usage: + * + * * mc_dwarf_resolve_locations or mc_dwarf_resolve_location is used + * to find the location of a given location expression or location list; + * + * * mc_get_location_type MUST be used to find the location type; + * + * * for MC_LOCATION_TYPE_ADDRESS, memory_address is the resulting address + * + * * for MC_LOCATION_TYPE_REGISTER, unw_get_reg(l.cursor, l.register_id, value) + * and unw_get_reg(l.cursor, l.register_id, value) can be used to read/write + * the value. + * + */ +typedef struct s_mc_location { + void* memory_location; + unw_cursor_t* cursor; + int register_id; +} s_mc_location_t, *mc_location_t; + +/** Type of a given location + * + * Use `mc_get_location_type(location)` to find the type. + * */ +typedef enum mc_location_type { + MC_LOCATION_TYPE_ADDRESS, + MC_LOCATION_TYPE_REGISTER +} mc_location_type; + +/** Find the type of a location */ +static inline __attribute__ ((always_inline)) +enum mc_location_type mc_get_location_type(mc_location_t location) { + if (location->cursor) { + return MC_LOCATION_TYPE_REGISTER; + } else { + return MC_LOCATION_TYPE_ADDRESS; + } +} + +void mc_dwarf_resolve_location(mc_location_t 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); +void mc_dwarf_resolve_locations(mc_location_t location, 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); + +void mc_dwarf_location_list_clear(mc_location_list_t list); + +void mc_dwarf_location_list_init_from_expression(mc_location_list_t target, size_t len, Dwarf_Op* ops); +void mc_dwarf_location_list_init(mc_location_list_t target, mc_object_info_t info, Dwarf_Die* die, Dwarf_Attribute* attr); + +// ***** Variables and functions + +struct s_dw_type{ + e_dw_type_type type; + Dwarf_Off id; /* Offset in the section (in hexadecimal form) */ + char *name; /* Name of the type */ + int byte_size; /* Size in bytes */ + int element_count; /* Number of elements for array type */ + char *dw_type_id; /* DW_AT_type id */ + xbt_dynar_t members; /* if DW_TAG_structure_type, DW_TAG_class_type, DW_TAG_union_type*/ + int is_pointer_type; + + // Location (for members) is either of: + struct s_mc_expression location; + int offset; + + dw_type_t subtype; // DW_AT_type + 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, int process_index); typedef struct s_dw_variable{ Dwarf_Off dwarf_offset; /* Global offset of the field. */ int global; char *name; char *type_origin; + dw_type_t type; // Use either of: - dw_location_t location; + s_mc_location_list_t locations; void* address; + size_t start_scope; + mc_object_info_t object_info; + }s_dw_variable_t, *dw_variable_t; struct s_dw_frame{ + int tag; char *name; void *low_pc; void *high_pc; - dw_location_t frame_base; + s_mc_location_list_t frame_base; xbt_dynar_t /* */ variables; /* Cannot use dict, there may be several variables with the same name (in different lexical blocks)*/ - unsigned long int start; /* DWARF offset of the subprogram */ - unsigned long int end; /* Dwarf offset of the next sibling */ + unsigned long int id; /* DWARF offset of the subprogram */ + xbt_dynar_t /* */ scopes; + Dwarf_Off abstract_origin_id; + mc_object_info_t object_info; }; struct s_mc_function_index_item { @@ -459,6 +626,8 @@ struct s_mc_function_index_item { dw_frame_t function; }; +void mc_frame_free(dw_frame_t freme); + void dw_type_free(dw_type_t t); void dw_variable_free(dw_variable_t v); void dw_variable_free_voidp(void *t); @@ -467,20 +636,57 @@ void MC_dwarf_register_global_variable(mc_object_info_t info, dw_variable_t vari void MC_register_variable(mc_object_info_t info, dw_frame_t frame, dw_variable_t variable); void MC_dwarf_register_non_global_variable(mc_object_info_t info, dw_frame_t frame, dw_variable_t variable); void MC_dwarf_register_variable(mc_object_info_t info, dw_frame_t frame, dw_variable_t variable); + +/** Find the DWARF offset for this ELF object + * + * An offset is applied to address found in DWARF: + * + *
    + *
  • for an executable obejct, addresses are virtual address + * (there is no offset) i.e. \f$\text{virtual address} = \{dwarf address}\f$;
    • + *
  • for a shared object, the addreses are offset from the begining + * of the shared object (the base address of the mapped shared + * object must be used as offset + * i.e. \f$\text{virtual address} = \text{shared object base address} + * + \text{dwarf address}\f$.
    • + * + */ void* MC_object_base_address(mc_object_info_t info); /********************************** DWARF **********************************/ -Dwarf_Off MC_dwarf_resolve_location(unw_cursor_t* c, dw_location_t location, void* frame_pointer_address); -void* mc_find_frame_base(unw_word_t ip, dw_frame_t frame, unw_cursor_t* unw_cursor); +#define MC_EXPRESSION_STACK_SIZE 64 + +#define MC_EXPRESSION_OK 0 +#define MC_EXPRESSION_E_UNSUPPORTED_OPERATION 1 +#define MC_EXPRESSION_E_STACK_OVERFLOW 2 +#define MC_EXPRESSION_E_STACK_UNDERFLOW 3 +#define MC_EXPRESSION_E_MISSING_STACK_CONTEXT 4 +#define MC_EXPRESSION_E_MISSING_FRAME_BASE 5 +#define MC_EXPRESSION_E_NO_BASE_ADDRESS 6 + +typedef struct s_mc_expression_state { + uintptr_t stack[MC_EXPRESSION_STACK_SIZE]; + size_t stack_size; + + unw_cursor_t* cursor; + 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* mc_find_frame_base(dw_frame_t frame, mc_object_info_t object_info, unw_cursor_t* unw_cursor); /********************************** Miscellaneous **********************************/ typedef struct s_local_variable{ - char *frame; + dw_frame_t subprogram; unsigned long ip; char *name; - char *type; + dw_type_t type; void *address; int region; }s_local_variable_t, *local_variable_t; @@ -491,25 +697,30 @@ typedef struct s_mc_comm_pattern{ int num; smx_action_t comm; e_smx_comm_type_t type; - int completed; unsigned long src_proc; unsigned long dst_proc; + const char *src_host; + const char *dst_host; char *rdv; - size_t data_size; + ssize_t data_size; void *data; - int matched_comm; }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; void get_comm_pattern(xbt_dynar_t communications_pattern, smx_simcall_t request, int call); +void complete_comm_pattern(xbt_dynar_t list, smx_action_t comm); +void MC_pre_modelcheck_comm_determinism(void); +void MC_modelcheck_comm_determinism(void); /* *********** Sets *********** */ typedef struct s_mc_address_set *mc_address_set_t; mc_address_set_t mc_address_set_new(); -mc_address_set_t mc_address_set_free(mc_address_set_t* p); +void mc_address_set_free(mc_address_set_t* p); void mc_address_add(mc_address_set_t p, const void* value); bool mc_address_test(mc_address_set_t p, const void* value); @@ -522,5 +733,134 @@ 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); -#endif +/* *********** 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*)); +} + +#define MC_LOG_REQUEST(log, req, value) \ + if (XBT_LOG_ISENABLED(log, xbt_log_priority_debug)) { \ + char* req_str = MC_request_to_string(req, value); \ + XBT_DEBUG("Execute: %s", req_str); \ + xbt_free(req_str); \ + } + +SG_END_DECL() + +#endif