quantum/variable_trace.c

   1 /* Copyright 2016 Fred Sundvik
   2  *
   3  * This program is free software: you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation, either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include "variable_trace.h"
  18 #include <stddef.h>
  19 #include <string.h>
  20
  21 #ifdef NO_PRINT
  22 #error "You need undef NO_PRINT to use the variable trace feature"
  23 #endif
  24
  25 #ifndef CONSOLE_ENABLE
  26 #error "The console needs to be enabled in the makefile to use the variable trace feature"
  27 #endif
  28
  29
  30 #define NUM_TRACED_VARIABLES 1
  31 #ifndef MAX_VARIABLE_TRACE_SIZE
  32     #define MAX_VARIABLE_TRACE_SIZE 4
  33 #endif
  34
  35 typedef struct {
  36     const char* name;
  37     void* addr;
  38     unsigned size;
  39     const char* func;
  40     int line;
  41     uint8_t last_value[MAX_VARIABLE_TRACE_SIZE];
  42
  43 } traced_variable_t;
  44
  45 static traced_variable_t traced_variables[NUM_TRACED_VARIABLES];
  46
  47 void add_traced_variable(const char* name, void* addr, unsigned size, const char* func, int line) {
  48     verify_traced_variables(func, line);
  49     if (size > MAX_VARIABLE_TRACE_SIZE) {
  50 #if defined(__AVR__)
  51        xprintf("Traced variable \"%S\" exceeds the maximum size %d\n", name, size);
  52 #else
  53        xprintf("Traced variable \"%s\" exceeds the maximum size %d\n", name, size);
  54 #endif
  55        size = MAX_VARIABLE_TRACE_SIZE;
  56     }
  57     int index = -1;
  58     for (int i = 0; i < NUM_TRACED_VARIABLES; i++) {
  59         if (index == -1 && traced_variables[i].addr == NULL){
  60             index = i;
  61         }
  62         else if (strcmp_P(name, traced_variables[i].name)==0) {
  63             index = i;
  64             break;
  65         }
  66     }
  67
  68     if (index == -1) {
  69         xprintf("You can only trace %d variables at the same time\n", NUM_TRACED_VARIABLES);
  70         return;
  71     }
  72
  73     traced_variable_t* t = &traced_variables[index];
  74     t->name = name;
  75     t->addr = addr;
  76     t->size = size;
  77     t->func = func;
  78     t->line = line;
  79     memcpy(&t->last_value[0], addr, size);
  80
  81 }
  82
  83 void remove_traced_variable(const char* name, const char* func, int line) {
  84     verify_traced_variables(func, line);
  85     for (int i = 0; i < NUM_TRACED_VARIABLES; i++) {
  86         if (strcmp_P(name, traced_variables[i].name)==0) {
  87             traced_variables[i].name = 0;
  88             traced_variables[i].addr = NULL;
  89             break;
  90         }
  91     }
  92 }
  93
  94 void verify_traced_variables(const char* func, int line) {
  95     for (int i = 0; i < NUM_TRACED_VARIABLES; i++) {
  96         traced_variable_t* t = &traced_variables[i];
  97         if (t->addr != NULL && t->name != NULL) {
  98             if (memcmp(t->last_value, t->addr, t->size)!=0){
  99 #if defined(__AVR__)
 100                xprintf("Traced variable \"%S\" has been modified\n", t->name);
 101                xprintf("Between %S:%d\n", t->func, t->line);
 102                xprintf("And %S:%d\n", func, line);
 103
 104 #else
 105                xprintf("Traced variable \"%s\" has been modified\n", t->name);
 106                xprintf("Between %s:%d\n", t->func, t->line);
 107                xprintf("And %s:%d\n", func, line);
 108 #endif
 109                xprintf("Previous value ");
 110                for (int j=0; j<t->size;j++) {
 111                    print_hex8(t->last_value[j]);
 112                }
 113                xprintf("\nNew value ");
 114                uint8_t* addr = (uint8_t*)(t->addr);
 115                for (int j=0; j<t->size;j++) {
 116                    print_hex8(addr[j]);
 117                }
 118                xprintf("\n");
 119                memcpy(t->last_value, addr, t->size);
 120            }
 121         }
 122
 123         t->func = func;
 124         t->line = line;
 125     }
 126 }