Added more exception handling after debugging ./examples/byte_for_demo.fun. (0.37.0)

src/vm/core/throw.c

@@ -0,0 +1,33 @@
+/**
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ */
+
+case OP_THROW: {
+    Value err = pop_value(vm);
+    /* if there is a handler in this frame, jump to it and push err for catch */
+    if (f->try_sp >= 0) {
+        int try_idx = f->try_stack[f->try_sp--];
+        int target = f->fn->instructions[try_idx].operand;
+        /* push error for catch block */
+        push_value(vm, err); /* transfer ownership to stack */
+        f->ip = target;
+        break;
+    }
+    /* Unhandled: print error and terminate */
+    char *s = value_to_string_alloc(&err);
+    if (s) {
+        fprintf(stdout, "%s\n", s);
+        free(s);
+    } else {
+        fprintf(stdout, "<error>\n");
+    }
+    free_value(err);
+    /* clear frames to stop execution */
+    vm->fp = -1;
+    break;
+}

src/vm/core/try_pop.c

@@ -0,0 +1,13 @@
+/**
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ */
+
+case OP_TRY_POP: {
+    if (f->try_sp >= 0) f->try_sp--;
+    break;
+}

src/vm/core/try_push.c

@@ -0,0 +1,18 @@
+/**
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ */
+
+case OP_TRY_PUSH: {
+    /* push index of this TRY instruction; handler ip is in its operand (may be patched later) */
+    if (f->try_sp >= (int)(sizeof(f->try_stack)/sizeof(f->try_stack[0])) - 1) {
+        fprintf(stderr, "Runtime error: try depth exceeded\n");
+        exit(1);
+    }
+    f->try_stack[++f->try_sp] = f->ip - 1; /* index of TRY_PUSH instruction */
+    break;
+}