1 files changed, 54 insertions, 0 deletions
diff --git a/src/interp/routines/limited.c b/src/interp/routines/limited.c
new file mode 100644
index 0000000..dc18ded
--- /dev/null
+++ b/src/interp/routines/limited.c
@@ -0,0 +1,54 @@
+/*
+ * nanowasm, a tiny WebAssembly/Wasm interpreter
+ * Copyright (C) 2023-2025  Xavier Del Campo Romero
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include <nanowasm/nw.h>
+#include <nanowasm/types.h>
+#include <nw/interp.h>
+#include <nw/io.h>
+#include <nw/log.h>
+#include <nw/routines.h>
+#include <stddef.h>
+
+static enum nw_state get_bytecode(struct nw_interp *const in)
+{
+    const struct nw_io_cfg *const cfg = &in->cfg.io;
+    struct nw_i_sm_b *const b = &in->sm.bytecode;
+    const struct nwp_interp_set *const set = in->set;
+    static const char *const exc = "invalid opcode";
+    const enum nw_state n = nwp_io_read(cfg, &b->io, cfg->user);
+    size_t i;
+
+    if (n)
+        return n;
+
+    for (i = 0; i < set->n; i++)
+        if (b->op == set->opcodes[i])
+        {
+            b->f = nwp_ops.ops[b->op];
+            in->next = nwp_execute;
+            return NW_AGAIN;
+        }
+
+#ifdef NW_LOG
+    nwp_log("%s: %#x\n", exc, (unsigned)b->op);
+#endif
+    in->exception = exc;
+    return NW_FATAL;
+}
+
+void nwp_interp_limited(struct nw_interp *const i)
+{
+    struct nw_i_sm_b *const b = &i->sm.bytecode;
+    struct nw_sm_io io = {0};
+
+    io.buf = &b->op;
+    io.n = sizeof b->op;
+    b->io = io;
+    i->next = get_bytecode;
+}