1 files changed, 71 insertions, 0 deletions
diff --git a/src/dbg/param.c b/src/dbg/param.c
new file mode 100644
index 0000000..db0a599
--- /dev/null
+++ b/src/dbg/param.c
@@ -0,0 +1,71 @@
+/*
+ * 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/dbg.h>
+#include <nw/log.h>
+#include <nw/routines.h>
+#include <nw/stack.h>
+#include <nw/types.h>
+
+static enum nw_state read_param(struct nw_interp *const i)
+{
+    struct nw_dbg *const d = i->args;
+    struct nw_dbg_sm_param *const p = &d->sm.param;
+    const struct nw_find_param_out *const out = &p->fp.out;
+    const enum nw_state n = nwp_stack_read(i, &p->io, out->addr);
+
+    if (n)
+        return n;
+
+    i->next = p->inext;
+    return NW_AGAIN;
+}
+
+static enum nw_state done(struct nw_interp *const i)
+{
+    struct nw_dbg *const d = i->args;
+    struct nw_dbg_sm_param *const p = &d->sm.param;
+    const struct nw_find_param_out *const po = &p->fp.out;
+    const enum nw_type t = po->type;
+    size_t sz;
+
+    if (nwp_type_sz(t, &sz))
+    {
+        static const char *const exc = "invalid type";
+
+        i->exception = exc;
+#ifdef NW_LOG
+        nwp_log("%s: %#x\n", exc, (unsigned)t);
+#endif
+        return -1;
+    }
+    else
+    {
+        struct nw_sm_io io = {0};
+
+        io.buf = &d->v.value;
+        io.n = sz;
+        p->io = io;
+    }
+
+    i->next = read_param;
+    return NW_AGAIN;
+}
+
+void nw_dbg_param(struct nw_dbg *const d, const unsigned long index)
+{
+    const struct nw_dbg_sm_param p = {0};
+    struct nw_dbg_sm_param *const pp = &d->sm.param;
+    struct nw_interp *const i = &d->cfg.inst->interp;
+
+    *pp = p;
+    pp->inext = i->next;
+    nwp_find_param(i, &pp->fp, index, done, d);
+}