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#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;
}
}
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