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/*
* Copyright (C) 2021 Jo-Philipp Wich <jo@mein.io>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Example to compile a C string into an ucode program.
* Build with gcc -o execute-string -lucode execute-string.c
*/
#include <stdio.h>
#include <ucode/compiler.h>
#include <ucode/lib.h>
#include <ucode/vm.h>
#define MULTILINE_STRING(...) #__VA_ARGS__
static const char *program = MULTILINE_STRING(
{%
function add(a, b) {
c = a + b;
return c;
}
result = add(x, y);
printf('%d + %d is %d\n', x, y, result);
return result;
%}
);
static uc_parse_config_t config = {
.strict_declarations = false,
.lstrip_blocks = true,
.trim_blocks = true
};
int main(int argc, char **argv)
{
int exit_code = 0;
/* create a source buffer containing the program code */
uc_source_t *src = uc_source_new_buffer("my program", strdup(program), strlen(program));
/* compile source buffer into function */
char *syntax_error = NULL;
uc_function_t *progfunc = uc_compile(&config, src, &syntax_error);
/* release source buffer */
uc_source_put(src);
/* check if compilation failed */
if (!progfunc) {
fprintf(stderr, "Failed to compile program: %s\n", syntax_error);
return 1;
}
/* initialize VM context */
uc_vm_t vm = { 0 };
uc_vm_init(&vm, &config);
/* load standard library into global VM scope */
uc_stdlib_load(uc_vm_scope_get(&vm));
/* add global variables x and y to VM scope */
ucv_object_add(uc_vm_scope_get(&vm), "x", ucv_int64_new(123));
ucv_object_add(uc_vm_scope_get(&vm), "y", ucv_int64_new(456));
/* execute compiled program function */
uc_value_t *last_expression_result = NULL;
int return_code = uc_vm_execute(&vm, progfunc, &last_expression_result);
/* handle return status */
switch (return_code) {
case STATUS_OK:
exit_code = 0;
char *s = ucv_to_string(&vm, last_expression_result);
printf("Program finished successfully.\n");
printf("Function return value is %s\n", s);
free(s);
break;
case STATUS_EXIT:
exit_code = (int)ucv_int64_get(last_expression_result);
printf("The invoked program called exit().\n");
printf("Exit code is %d\n", exit_code);
break;
case ERROR_COMPILE:
exit_code = 1;
printf("A compilation error occurred while running the program\n");
break;
case ERROR_RUNTIME:
exit_code = 2;
printf("A runtime error occurred while running the program\n");
break;
}
/* free last expression result */
ucv_put(last_expression_result);
/* free VM context */
uc_vm_free(&vm);
return exit_code;
}
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