1 files changed, 100 insertions, 0 deletions
diff --git a/examples/exception-handler.c b/examples/exception-handler.c
new file mode 100644
index 0000000..e2b1058
--- /dev/null
+++ b/examples/exception-handler.c
@@ -0,0 +1,100 @@
+/*
+ * 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.
+ */
+
+#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 fail() {
+			/* invoke not existing function to raise runtime error */
+			doesnotexist();
+		}
+
+		fail();
+	%}
+);
+
+static uc_parse_config_t config = {
+	.strict_declarations = false,
+	.lstrip_blocks = true,
+	.trim_blocks = true
+};
+
+static void
+log_exception(uc_vm_t *vm, uc_exception_t *ex)
+{
+	char *trace = ucv_to_jsonstring_formatted(vm, ex->stacktrace, ' ', 2);
+
+	printf("Program raised an exception:\n");
+	printf("  type=%d\n", ex->type);
+	printf("  message=%s\n", ex->message);
+	printf("  stacktrace=%s\n", trace);
+
+	free(trace);
+}
+
+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_load_stdlib(uc_vm_scope_get(&vm));
+
+	/* register custom exception handler */
+	uc_vm_exception_handler_set(&vm, log_exception);
+
+	/* execute program function */
+	int return_code = uc_vm_execute(&vm, progfunc, NULL);
+
+	/* handle return status */
+	if (return_code == ERROR_COMPILE || return_code == ERROR_RUNTIME) {
+		printf("An error occurred while running the program\n");
+		exit_code = 1;
+	}
+
+	/* free VM context */
+	uc_vm_free(&vm);
+
+	return exit_code;
+}