/* ``If you can't do it in ANSI C, it isn't worth doing.'' -- Unknown */

A framework that extends C with reflection and some other related golang-like features. Reflection implementation is based on DWARF data - one of the most common debugging information formats used by debuggers like gdb or lldb. Metac/reflect offers a familiar API similar in many ways to Golang/reflect package for introspecting code and manipulating data at runtime.

Features:

• Reflection for all native C types.
• 'Deep' functionality for printing, copying, comparing, and freeing memory of complex data structures.
• Supported on Ubuntu, macOS, Windows (msys2) with gcc or clang.

Structure fields printing example:

#include <stdio.h>  // printf
#include <stdlib.h> // free
#include <math.h>   // M_PI, M_E
#include "metac/reflect.h"

struct test {
    int y;
    char c;
    double pi;
    double e;
    short _uninitialized_field;
};

int main(){
    // we need to use this construction to wrap variable declaration
    // to get its type information
    WITH_METAC_DECLLOC(decl_location,
        struct test t = {
            .y = -10,
            .c = 'a',
            .pi = M_PI,
            .e = M_E,
        };
    )
    metac_value_t *p_val = METAC_VALUE_FROM_DECLLOC(decl_location, t);

    char * s;
    s = metac_entry_cdecl(metac_value_entry(p_val));
    // next will output "struct test t = "
    printf("%s = ", s);
    free(s);

    s = metac_value_string(p_val);
    // next will output "{.y = -10, .c = 'a', .pi = 3.141593, .e = 2.718282, ._uninitialized_field = 0,};\n"
    printf("%s;\n", s);
    free(s);

    metac_value_delete(p_val);

    return 0;
}

Function parameters printing example:

#include "metac/reflect.h"
#include <stdlib.h> /*free*/

#define METAC_WRAP_FN_RES(_tag_map_, _fn_, _args_...) ({ \
        metac_parameter_storage_t * p_param_storage = metac_new_parameter_storage(); \
        if (p_param_storage != NULL) { \
            p_val = metac_new_value_with_parameters(p_param_storage, _tag_map_, METAC_GSYM_LINK_ENTRY(_fn_), _args_); \
        } \
        _fn_(_args_);\
})

int test_function1_with_args(int a, short b){
    return a + b + 6;
}
METAC_GSYM_LINK(test_function1_with_args);

int main() {
    metac_value_t * p_val = NULL;
    // next will call test_function1_with_args and will output "fn returned: 38"
    printf("fn returned: %i\n", METAC_WRAP_FN_RES(NULL, test_function1_with_args, 10, 22));
    if (p_val != NULL) {
        char * s = metac_value_string_ex(p_val, METAC_WMODE_deep, NULL);
        if (s != NULL) {
            // next will output "captured test_function1_with_args(10, 22)"
            printf("captured %s\n", s);
            free(s);
        }
        metac_parameter_storage_t * p_param_storage = (metac_parameter_storage_t *)metac_value_addr(p_val);
        metac_parameter_storage_delete(p_param_storage);
        metac_value_delete(p_val);
    }
    return 0;
}

To get more details please refer to the How to document.