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..766b2d3
--- /dev/null
+++ b/src/interp/routines/limited.c
@@ -0,0 +1,54 @@
+/*
+ * nanowasm, a tiny WebAssembly/Wasm interpreter
+ * Copyright (C) 2023-2024  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>
+#include <inttypes.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 enum nw_state n = nwp_io_read(cfg, &b->io);
+
+    if (n)
+        return n;
+
+    const struct nwp_interp_set *const set = in->set;
+
+    for (size_t i = 0; i < set->n; i++)
+        if (b->op == set->opcodes[i])
+        {
+            nwp_ops.ops[b->op](in);
+            return NW_AGAIN;
+        }
+
+    static const char exc[] = "invalid opcode";
+
+    LOG("%s: %s: %#" PRIx8 "\n", __func__, exc, b->op);
+    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;
+
+    i->next = get_bytecode;
+    b->io = (const struct nw_sm_io)
+    {
+        .buf = &b->op,
+        .n = sizeof b->op
+    };
+}