1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/* Copyright 2016 Fred Sundvik
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "variable_trace.h"
#include <stddef.h>
#include <string.h>
#ifdef NO_PRINT
# error "You need undef NO_PRINT to use the variable trace feature"
#endif
#ifndef CONSOLE_ENABLE
# error "The console needs to be enabled in the makefile to use the variable trace feature"
#endif
#define NUM_TRACED_VARIABLES 1
#ifndef MAX_VARIABLE_TRACE_SIZE
# define MAX_VARIABLE_TRACE_SIZE 4
#endif
typedef struct {
const char* name;
void* addr;
unsigned size;
const char* func;
int line;
uint8_t last_value[MAX_VARIABLE_TRACE_SIZE];
} traced_variable_t;
static traced_variable_t traced_variables[NUM_TRACED_VARIABLES];
void add_traced_variable(const char* name, void* addr, unsigned size, const char* func, int line) {
verify_traced_variables(func, line);
if (size > MAX_VARIABLE_TRACE_SIZE) {
#if defined(__AVR__)
xprintf("Traced variable \"%S\" exceeds the maximum size %d\n", name, size);
#else
xprintf("Traced variable \"%s\" exceeds the maximum size %d\n", name, size);
#endif
size = MAX_VARIABLE_TRACE_SIZE;
}
int index = -1;
for (int i = 0; i < NUM_TRACED_VARIABLES; i++) {
if (index == -1 && traced_variables[i].addr == NULL) {
index = i;
} else if (strcmp_P(name, traced_variables[i].name) == 0) {
index = i;
break;
}
}
if (index == -1) {
xprintf("You can only trace %d variables at the same time\n", NUM_TRACED_VARIABLES);
return;
}
traced_variable_t* t = &traced_variables[index];
t->name = name;
t->addr = addr;
t->size = size;
t->func = func;
t->line = line;
memcpy(&t->last_value[0], addr, size);
}
void remove_traced_variable(const char* name, const char* func, int line) {
verify_traced_variables(func, line);
for (int i = 0; i < NUM_TRACED_VARIABLES; i++) {
if (strcmp_P(name, traced_variables[i].name) == 0) {
traced_variables[i].name = 0;
traced_variables[i].addr = NULL;
break;
}
}
}
void verify_traced_variables(const char* func, int line) {
for (int i = 0; i < NUM_TRACED_VARIABLES; i++) {
traced_variable_t* t = &traced_variables[i];
if (t->addr != NULL && t->name != NULL) {
if (memcmp(t->last_value, t->addr, t->size) != 0) {
#if defined(__AVR__)
xprintf("Traced variable \"%S\" has been modified\n", t->name);
xprintf("Between %S:%d\n", t->func, t->line);
xprintf("And %S:%d\n", func, line);
#else
xprintf("Traced variable \"%s\" has been modified\n", t->name);
xprintf("Between %s:%d\n", t->func, t->line);
xprintf("And %s:%d\n", func, line);
#endif
xprintf("Previous value ");
for (int j = 0; j < t->size; j++) {
print_hex8(t->last_value[j]);
}
xprintf("\nNew value ");
uint8_t* addr = (uint8_t*)(t->addr);
for (int j = 0; j < t->size; j++) {
print_hex8(addr[j]);
}
xprintf("\n");
memcpy(t->last_value, addr, t->size);
}
}
t->func = func;
t->line = line;
}
}
|
