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123 lines
4.0 KiB
123 lines
4.0 KiB
/* Copyright 2016 Fred Sundvik
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "variable_trace.h"
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#include <stddef.h>
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#include <string.h>
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#ifdef NO_PRINT
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# error "You need undef NO_PRINT to use the variable trace feature"
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#endif
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#ifndef CONSOLE_ENABLE
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# error "The console needs to be enabled in the makefile to use the variable trace feature"
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#endif
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#define NUM_TRACED_VARIABLES 1
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#ifndef MAX_VARIABLE_TRACE_SIZE
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# define MAX_VARIABLE_TRACE_SIZE 4
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#endif
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typedef struct {
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const char* name;
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void* addr;
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unsigned size;
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const char* func;
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int line;
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uint8_t last_value[MAX_VARIABLE_TRACE_SIZE];
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} traced_variable_t;
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static traced_variable_t traced_variables[NUM_TRACED_VARIABLES];
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void add_traced_variable(const char* name, void* addr, unsigned size, const char* func, int line) {
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verify_traced_variables(func, line);
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if (size > MAX_VARIABLE_TRACE_SIZE) {
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#if defined(__AVR__)
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xprintf("Traced variable \"%S\" exceeds the maximum size %d\n", name, size);
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#else
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xprintf("Traced variable \"%s\" exceeds the maximum size %d\n", name, size);
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#endif
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size = MAX_VARIABLE_TRACE_SIZE;
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}
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int index = -1;
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for (int i = 0; i < NUM_TRACED_VARIABLES; i++) {
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if (index == -1 && traced_variables[i].addr == NULL) {
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index = i;
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} else if (strcmp_P(name, traced_variables[i].name) == 0) {
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index = i;
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break;
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}
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}
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if (index == -1) {
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xprintf("You can only trace %d variables at the same time\n", NUM_TRACED_VARIABLES);
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return;
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}
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traced_variable_t* t = &traced_variables[index];
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t->name = name;
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t->addr = addr;
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t->size = size;
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t->func = func;
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t->line = line;
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memcpy(&t->last_value[0], addr, size);
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}
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void remove_traced_variable(const char* name, const char* func, int line) {
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verify_traced_variables(func, line);
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for (int i = 0; i < NUM_TRACED_VARIABLES; i++) {
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if (strcmp_P(name, traced_variables[i].name) == 0) {
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traced_variables[i].name = 0;
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traced_variables[i].addr = NULL;
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break;
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}
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}
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}
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void verify_traced_variables(const char* func, int line) {
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for (int i = 0; i < NUM_TRACED_VARIABLES; i++) {
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traced_variable_t* t = &traced_variables[i];
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if (t->addr != NULL && t->name != NULL) {
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if (memcmp(t->last_value, t->addr, t->size) != 0) {
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#if defined(__AVR__)
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xprintf("Traced variable \"%S\" has been modified\n", t->name);
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xprintf("Between %S:%d\n", t->func, t->line);
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xprintf("And %S:%d\n", func, line);
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#else
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xprintf("Traced variable \"%s\" has been modified\n", t->name);
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xprintf("Between %s:%d\n", t->func, t->line);
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xprintf("And %s:%d\n", func, line);
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#endif
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xprintf("Previous value ");
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for (int j = 0; j < t->size; j++) {
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print_hex8(t->last_value[j]);
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}
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xprintf("\nNew value ");
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uint8_t* addr = (uint8_t*)(t->addr);
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for (int j = 0; j < t->size; j++) {
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print_hex8(addr[j]);
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}
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xprintf("\n");
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memcpy(t->last_value, addr, t->size);
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}
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}
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t->func = func;
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t->line = line;
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}
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}
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