1 files changed, 81 insertions, 0 deletions
diff --git a/src/start.c b/src/start.c
new file mode 100644
index 0000000..788a5ad
--- /dev/null
+++ b/src/start.c
@@ -0,0 +1,81 @@
+/*
+ * 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/inst.h>
+#include <nw/interp.h>
+#include <nw/log.h>
+#include <nw/routines.h>
+#include <stddef.h>
+
+static enum nw_state push(struct nw_interp *const i)
+{
+    const struct nw_i_sm_exp *const e = &i->sm.export;
+
+    if (e->kind != NW_KIND_FUNCTION)
+    {
+        static const char *const exc = "unexpected import kind";
+
+        i->exception = exc;
+#ifdef NW_LOG
+        nwp_log("%s: %d\n", exc, e->kind);
+#endif
+        return NW_FATAL;
+    }
+
+    nwp_call(i, e->index);
+    return NW_AGAIN;
+}
+
+static enum nw_state find_start(struct nw_inst *const inst)
+{
+    struct nw_interp *const i = &inst->interp;
+    struct nw_interp_cfg cfg;
+
+    cfg = i->cfg;
+
+    if (nwp_interp_start(i, &cfg, NULL))
+    {
+#ifdef NW_LOG
+        nwp_log("nwp_interp_start failed\n");
+#endif
+        return NW_FATAL;
+    }
+
+    nwp_find_export(i, inst->entry, push);
+    inst->next = nwp_inst_run;
+    return NW_AGAIN;
+}
+
+static enum nw_state init_data(struct nw_inst *const i)
+{
+    nwp_init_data(i, find_start);
+    return NW_AGAIN;
+}
+
+int nw_start(struct nw_inst *const i, const struct nw_inst_cfg *const icfg)
+{
+    const struct nw_inst inst = {0};
+
+    *i = inst;
+    i->entry = icfg->entry;
+
+    if (nwp_interp_start(&i->interp, &icfg->interp_cfg,
+        &nwp_interp_initexpr_set))
+    {
+#ifdef NW_LOG
+        nwp_log("nwp_interp_start failed\n");
+#endif
+        return -1;
+    }
+
+    nwp_init_globals(i, init_data);
+    return 0;
+}