From 6d9d80362f9932bbc87e162b8ef7df06c73e27e1 Mon Sep 17 00:00:00 2001
From: Xavier Del Campo Romero <xavi.dcr@tutanota.com>
Date: Sat, 7 Sep 2024 00:04:38 +0200
Subject: First commit

---
 src/routines/section/memory.c | 86 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/routines/section/memory.c

(limited to 'src/routines/section/memory.c')

diff --git a/src/routines/section/memory.c b/src/routines/section/memory.c
new file mode 100644
index 0000000..9277230
--- /dev/null
+++ b/src/routines/section/memory.c
@@ -0,0 +1,86 @@
+/*
+ * 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 <nw/io.h>
+#include <nw/log.h>
+#include <nw/routines.h>
+
+static enum nw_state get_maximum(struct nw_mod *const m)
+{
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    struct nw_sm_mem *const mem = &m->sm.memory;
+    struct nw_mod_out_mem *const lin = &m->out.linear;
+    struct nw_sm_leb128 *const l = &mem->leb128;
+    const enum nw_state n = nwp_varuint32(cfg, l, &lin->max, cfg->user);
+
+    if (n)
+        return n;
+
+    m->next = nwp_section_exit;
+    return NW_AGAIN;
+}
+
+static enum nw_state get_initial(struct nw_mod *const m)
+{
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    struct nw_sm_mem *const mem = &m->sm.memory;
+    struct nw_mod_out_mem *const lin = &m->out.linear;
+    struct nw_sm_leb128 *const l = &mem->leb128;
+    const enum nw_state n = nwp_varuint32(cfg, l, &lin->initial, cfg->user);
+
+    if (n)
+        return n;
+
+    m->next = mem->flags ? get_maximum : nwp_section_exit;
+    return NW_AGAIN;
+}
+
+static enum nw_state get_flags(struct nw_mod *const m)
+{
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    struct nw_sm_mem *const mem = &m->sm.memory;
+    struct nw_sm_leb128 *const l = &mem->leb128;
+    const enum nw_state n = nwp_varuint1(cfg, l, &mem->flags, cfg->user);
+
+    if (n)
+        return n;
+
+    m->next = get_initial;
+    return NW_AGAIN;
+}
+
+static enum nw_state get_count(struct nw_mod *const m)
+{
+    const struct nw_io_cfg *const cfg = &m->cfg.io;
+    struct nw_sm_mem *const mem = &m->sm.memory;
+    struct nw_sm_leb128 *const l = &mem->leb128;
+    const enum nw_state n = nwp_varuint32(cfg, l, &mem->count, cfg->user);
+
+    if (n)
+        return n;
+    else if (mem->count > 1)
+    {
+#ifdef NW_LOG
+        nwp_log("MVP WebAssembly supports no more than 1 memory\n");
+#endif
+        return NW_FATAL;
+    }
+
+    m->next = mem->count ? get_flags : nwp_section_exit;
+    return NW_AGAIN;
+}
+
+void nwp_section_memory(struct nw_mod *const m)
+{
+    const struct nw_sm_mem mem = {0};
+
+    m->next = get_count;
+    m->sm.memory = mem;
+}
-- 
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