First commit

1 files changed, 122 insertions, 0 deletions

diff --git a/src/op/set_global.c b/src/op/set_global.c
new file mode 100644
index 0000000..9448c32
--- /dev/null
+++ b/src/op/set_global.c
@@ -0,0 +1,122 @@
+/*
+ * 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/global.h>
+#include <nw/io.h>
+#include <nw/interp.h>
+#include <nw/stack.h>
+#include <nw/log.h>
+#include <nw/ops.h>
+#include <nw/routines.h>
+
+static enum nw_state set_global(struct nw_interp *const i)
+{
+    struct nw_i_sm_get_global *const g = &i->sm.get_global;
+    const enum nw_state n = nwp_global_store(i, &g->io, g->index);
+
+    if (n)
+        return n;
+
+    nwp_interp_resume(i);
+    return NW_AGAIN;
+}
+
+static enum nw_state pop(struct nw_interp *const i)
+{
+    struct nw_i_sm_get_global *const g = &i->sm.get_global;
+    const enum nw_state n = nwp_stack_pop(i, &g->io);
+
+    if (n)
+        return n;
+    else
+    {
+        struct nw_sm_io io = {0};
+
+        io.buf = &g->gl;
+        io.n = sizeof g->gl;
+        g->io = io;
+        i->next = set_global;
+    }
+
+    return NW_AGAIN;
+}
+
+static enum nw_state read_global(struct nw_interp *const i)
+{
+    struct nw_i_sm_get_global *const g = &i->sm.get_global;
+    struct nw_global *const gl = &g->gl;
+    const enum nw_state n = nwp_global_load(i, &g->io, g->index);
+    size_t sz;
+
+    if (n)
+        return n;
+    else if (!gl->mutability)
+    {
+        static const char *const exc = "cannot set non-mutable global";
+
+        i->exception = exc;
+#ifdef NW_LOG
+        nwp_log("%s, index: %lu\n", exc, (unsigned long)g->index);
+#endif
+        return NW_FATAL;
+    }
+    else if (nwp_type_sz(gl->type, &sz))
+    {
+        static const char *const exc = "invalid global type";
+
+        i->exception = exc;
+#ifdef NW_LOG
+        nwp_log("%s: %#x\n", exc, (unsigned)gl->type);
+#endif
+        return NW_FATAL;
+    }
+    else
+    {
+        struct nw_sm_io io = {0};
+
+        io.buf = &gl->value;
+        io.n = sz;
+        g->io = io;
+        i->next = pop;
+        i->push_type = gl->type;
+    }
+
+    return NW_AGAIN;
+}
+
+static enum nw_state get_index(struct nw_interp *const i)
+{
+    struct nw_i_sm_get_global *const g = &i->sm.get_global;
+    struct nw_sm_leb128 *const l = &g->leb128;
+    const struct nw_io_cfg *const cfg = &i->cfg.io;
+    const enum nw_state n = nwp_varuint32(cfg, l, &g->index, cfg->user);
+
+    if (n)
+        return n;
+    else
+    {
+        struct nw_sm_io io = {0};
+
+        io.buf = &g->gl;
+        io.n = sizeof g->gl;
+        g->io = io;
+        i->next = read_global;
+    }
+
+    return NW_AGAIN;
+}
+
+void nwp_op_set_global(struct nw_interp *const i)
+{
+    static const struct nw_i_sm_set_global g = {0};
+
+    i->sm.set_global = g;
+    i->next = get_index;
+}