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/op/i32_load.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 src/op/i32_load.c

(limited to 'src/op/i32_load.c')

diff --git a/src/op/i32_load.c b/src/op/i32_load.c
new file mode 100644
index 0000000..e2d883b
--- /dev/null
+++ b/src/op/i32_load.c
@@ -0,0 +1,89 @@
+/*
+ * 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/interp.h>
+#include <nw/linear.h>
+#include <nw/stack.h>
+#include <nw/log.h>
+#include <nw/ops.h>
+#include <nw/routines.h>
+
+static enum nw_state push(struct nw_interp *const i)
+{
+    struct nw_i_sm_load *const l = &i->sm.load;
+    const enum nw_state n = nwp_stack_push(i, &l->io);
+
+    if (n)
+        return n;
+
+    i->push_type = NW_TYPE_I32;
+    nwp_interp_resume(i);
+    return NW_AGAIN;
+}
+
+static enum nw_state load(struct nw_interp *const i)
+{
+    struct nw_i_sm_load *const l = &i->sm.load;
+    const enum nw_state n = nwp_linear_load(i, &l->io, l->addr + l->imm.offset);
+
+    if (n)
+        return n;
+    else
+    {
+        struct nw_sm_io io = {0};
+
+        l->value.i32 = nwp_leuint32(&l->value.v32);
+        io.buf = &l->value.i32;
+        io.n = sizeof l->value.i32;
+        l->io = io;
+        i->next = push;
+    }
+
+    i->next = push;
+    return NW_AGAIN;
+}
+
+static enum nw_state pop_addr(struct nw_interp *const i)
+{
+    struct nw_i_sm_load *const l = &i->sm.load;
+    const enum nw_state n = nwp_stack_pop(i, &l->io);
+
+    if (n)
+        return n;
+    else
+    {
+        struct nw_sm_io io = {0};
+
+        io.buf = &l->value.i32;
+        io.n = sizeof l->value.i32;
+        l->io = io;
+        i->next = load;
+    }
+
+    return NW_AGAIN;
+}
+
+static void prepare(struct nw_interp *const i)
+{
+    struct nw_i_sm_imm_out imm = i->sm.imm.out;
+    struct nw_i_sm_load *const pl = &i->sm.load, l = {0};
+
+    l.imm = imm;
+    l.io.buf = &pl->addr;
+    l.io.n = sizeof pl->addr;
+    *pl = l;
+    i->next = pop_addr;
+}
+
+void nwp_op_i32_load(struct nw_interp *const i)
+{
+    nwp_mem_imm(i, prepare);
+}
-- 
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