First commit1st

1 files changed, 31 insertions, 0 deletions

diff --git a/src/interp/stack_pop.c b/src/interp/stack_pop.c
new file mode 100644
index 0000000..8650be1
--- /dev/null
+++ b/src/interp/stack_pop.c
@@ -0,0 +1,31 @@
+/*
+ * 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 <nw/interp.h>
+#include <nw/log.h>
+#include <stddef.h>
+#include <string.h>
+
+int interp_stack_pop(struct nw_interp *const i, void *const dst,
+    const size_t n)
+{
+    if (i->stack_i < n)
+    {
+        static const char exc[] = "stack underflow";
+
+        LOG("%s: %s\n", __func__, exc);
+        i->exception = exc;
+        return -1;
+    }
+
+    i->stack_i -= n;
+    memcpy(dst, nwp_interp_stackptr(i), n);
+    return 0;
+}