Damien
8 years ago
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GitHub
commit
0a99cf300c
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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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}
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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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@ -0,0 +1,34 @@
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#ifndef VARIABLE_TRACE_H
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#define VARIABLE_TRACE_H
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// For more information about the variable tracing see the readme.
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#include "print.h"
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#ifdef NUM_TRACED_VARIABLES
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// Start tracing a variable at the memory address addr
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// The name can be anything and is used only for reporting
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// The size should usually be the same size as the variable you are interested in
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#define ADD_TRACED_VARIABLE(name, addr, size) \
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add_traced_variable(PSTR(name), (void*)addr, size, PSTR(__FILE__), __LINE__)
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// Stop tracing the variable with the given name
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#define REMOVE_TRACED_VARIABLE(name) remove_traced_variable(PSTR(name), PSTR(__FILE__), __LINE__)
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// Call to get messages when the variable has been changed
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#define VERIFY_TRACED_VARIABLES() verify_traced_variables(PSTR(__FILE__), __LINE__)
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#else
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#define ADD_TRACED_VARIABLE(name, addr, size)
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#define REMOVE_TRACED_VARIABLE(name)
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#define VERIFY_TRACED_VARIABLES()
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#endif
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// Don't call directly, use the macros instead
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void add_traced_variable(const char* name, void* addr, unsigned size, const char* func, int line);
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void remove_traced_variable(const char* name, const char* func, int line);
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void verify_traced_variables(const char* func, int line);
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#endif
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