1 /* Copyright (c) 2004-2014. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #ifndef MC_OBJECT_LOCATION_H
8 #define MC_OBJECT_LOCATION_H
12 #define UNW_LOCAL_ONLY
13 #include <libunwind.h>
15 #include <elfutils/libdw.h>
17 #include <simgrid_config.h>
18 #include "mc_forward.h"
22 /** \brief a DWARF expression with optional validity contraints */
23 typedef struct s_mc_expression {
28 } s_mc_expression_t, *mc_expression_t;
30 /** A location list (list of location expressions) */
31 typedef struct s_mc_location_list {
33 mc_expression_t locations;
34 } s_mc_location_list_t, *mc_location_list_t;
36 /** A location is either a location in memory of a register location
40 * * mc_dwarf_resolve_locations or mc_dwarf_resolve_location is used
41 * to find the location of a given location expression or location list;
43 * * mc_get_location_type MUST be used to find the location type;
45 * * for MC_LOCATION_TYPE_ADDRESS, memory_address is the resulting address
47 * * for MC_LOCATION_TYPE_REGISTER, unw_get_reg(l.cursor, l.register_id, value)
48 * and unw_get_reg(l.cursor, l.register_id, value) can be used to read/write
52 typedef struct s_mc_location {
53 void* memory_location;
56 } s_mc_location_t, *mc_location_t;
58 /** Type of a given location
60 * Use `mc_get_location_type(location)` to find the type.
62 typedef enum mc_location_type {
63 MC_LOCATION_TYPE_ADDRESS,
64 MC_LOCATION_TYPE_REGISTER
67 /** Find the type of a location */
68 static inline __attribute__ ((always_inline))
69 enum mc_location_type mc_get_location_type(mc_location_t location) {
70 if (location->cursor) {
71 return MC_LOCATION_TYPE_REGISTER;
73 return MC_LOCATION_TYPE_ADDRESS;
77 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);
78 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);
80 void mc_dwarf_expression_clear(mc_expression_t expression);
81 void mc_dwarf_expression_init(mc_expression_t expression, size_t len, Dwarf_Op* ops);
83 void mc_dwarf_location_list_clear(mc_location_list_t list);
85 void mc_dwarf_location_list_init_from_expression(mc_location_list_t target, size_t len, Dwarf_Op* ops);
86 void mc_dwarf_location_list_init(mc_location_list_t target, mc_object_info_t info, Dwarf_Die* die, Dwarf_Attribute* attr);
88 #define MC_EXPRESSION_STACK_SIZE 64
90 #define MC_EXPRESSION_OK 0
91 #define MC_EXPRESSION_E_UNSUPPORTED_OPERATION 1
92 #define MC_EXPRESSION_E_STACK_OVERFLOW 2
93 #define MC_EXPRESSION_E_STACK_UNDERFLOW 3
94 #define MC_EXPRESSION_E_MISSING_STACK_CONTEXT 4
95 #define MC_EXPRESSION_E_MISSING_FRAME_BASE 5
96 #define MC_EXPRESSION_E_NO_BASE_ADDRESS 6
98 typedef struct s_mc_expression_state {
99 uintptr_t stack[MC_EXPRESSION_STACK_SIZE];
102 unw_cursor_t* cursor;
104 mc_snapshot_t snapshot;
105 mc_object_info_t object_info;
107 } s_mc_expression_state_t, *mc_expression_state_t;
109 int mc_dwarf_execute_expression(size_t n, const Dwarf_Op* ops, mc_expression_state_t state);
111 void* mc_find_frame_base(dw_frame_t frame, mc_object_info_t object_info, unw_cursor_t* unw_cursor);