First commit

1 files changed, 181 insertions, 0 deletions

diff --git a/src/routines/init_globals.c b/src/routines/init_globals.c
new file mode 100644
index 0000000..6d1e5e4
--- /dev/null
+++ b/src/routines/init_globals.c
@@ -0,0 +1,181 @@
+/*
+ * 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/types.h>
+#include <nw/global.h>
+#include <nw/interp.h>
+#include <nw/io.h>
+#include <nw/log.h>
+#include <nw/routines.h>
+#include <nw/stack.h>
+#include <nw/types.h>
+
+static enum nw_state get_content_type(struct nw_inst *const i);
+
+static enum nw_state store(struct nw_inst *const inst)
+{
+    struct nw_inst_sm_gl *const g = &inst->sm.global;
+    struct nw_interp *const i = &inst->interp;
+    const enum nw_state n = nwp_global_store(i, &g->io, g->entry_i);
+
+    if (n)
+        return n;
+
+    inst->next = ++g->entry_i >= g->count ? g->next : get_content_type;
+    return NW_AGAIN;
+}
+
+static enum nw_state pop(struct nw_inst *const inst)
+{
+    struct nw_inst_sm_gl *const g = &inst->sm.global;
+    struct nw_interp *const i = &inst->interp;
+    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->out;
+        io.n = sizeof g->out;
+        g->io = io;
+        inst->next = store;
+    }
+
+    return NW_AGAIN;
+}
+
+static enum nw_state loop(struct nw_inst *const i)
+{
+    struct nw_inst_sm_gl *const g = &i->sm.global;
+    const enum nw_state n = nwp_interp_run(&i->interp);
+    size_t sz;
+
+    if (n)
+        return n;
+    else if (nwp_type_sz(g->out.type, &sz))
+    {
+#ifdef NW_LOG
+        static const char *const exc = "invalid type";
+
+        nwp_log("%s: %#x\n", exc, (unsigned)g->out.type);
+#endif
+        return NW_FATAL;
+    }
+    else
+    {
+        struct nw_sm_io io = {0};
+
+        io.buf = &g->out.value;
+        io.n = sz;
+        g->io = io;
+        i->next = pop;
+    }
+
+    return NW_AGAIN;
+}
+
+static enum nw_state get_mutability(struct nw_inst *const inst)
+{
+    struct nw_inst_sm_gl *const g = &inst->sm.global;
+    struct nw_interp *const i = &inst->interp;
+    const struct nw_io_cfg *const cfg = &i->cfg.io;
+    struct nw_sm_leb128 *const l = &g->leb128;
+    const enum nw_state n = nwp_varuint1(cfg, l, &g->out.mutability, cfg->user);
+
+    if (n)
+        return n;
+
+    nwp_interp_resume(i);
+    inst->next = loop;
+    return NW_AGAIN;
+}
+
+static enum nw_state get_content_type(struct nw_inst *const i)
+{
+    nw_varint7 content_type;
+    struct nw_inst_sm_gl *const g = &i->sm.global;
+    const struct nw_io_cfg *const cfg = &i->interp.cfg.io;
+    struct nw_sm_leb128 *const l = &g->leb128;
+    const enum nw_state n = nwp_varint7(cfg, l, &content_type, cfg->user);
+
+    if (n)
+        return n;
+    else if (nwp_get_type(content_type, &g->out.type))
+    {
+#ifdef NW_LOG
+        static const char *const exc = "invalid type";
+
+        nwp_log("%s: %#x\n", exc, (unsigned)content_type);
+#endif
+        return NW_FATAL;
+    }
+
+    i->next = get_mutability;
+    return NW_AGAIN;
+}
+
+static enum nw_state get_count(struct nw_inst *const i)
+{
+    struct nw_inst_sm_gl *const g = &i->sm.global;
+    struct nw_sm_leb128 *const l = &g->leb128;
+    const struct nw_interp_cfg *const icfg = &i->interp.cfg;
+    const struct nw_io_cfg *const cfg = &icfg->io;
+    const nw_varuint32 expected = icfg->m->global_count;
+    const enum nw_state n = nwp_varuint32(cfg, l, &g->count, cfg->user);
+
+    if (n)
+        return n;
+    else if (g->count != expected)
+    {
+#ifdef NW_LOG
+        static const char *const exc = "global count mismatch";
+
+        nwp_log("%s, expected %lu, got %lu\n", exc,
+            (unsigned long)expected, (unsigned long)g->count);
+#endif
+        return NW_FATAL;
+    }
+
+    i->next = g->count ? get_content_type : g->next;
+    return NW_AGAIN;
+}
+
+static enum nw_state seek_global(struct nw_inst *const i)
+{
+    struct nw_inst_sm_gl *const g = &i->sm.global;
+    const struct nw_interp_cfg *const icfg = &i->interp.cfg;
+    const struct nw_io_cfg *const cfg = &icfg->io;
+    const long offset = icfg->m->sections[NW_SECTION_GLOBAL];
+    enum nw_state n;
+
+    if (!offset)
+    {
+        i->next = g->next;
+        return NW_AGAIN;
+    }
+    else if ((n = cfg->seek(offset, cfg->user)))
+        return n;
+
+    i->next = get_count;
+    return NW_AGAIN;
+}
+
+void nwp_init_globals(struct nw_inst *const i,
+    enum nw_state (*const next)(struct nw_inst *))
+{
+    const struct nw_inst_sm_gl gl = {0};
+    struct nw_inst_sm_gl *const p = &i->sm.global;
+
+    *p = gl;
+    p->next = next;
+    i->next = seek_global;
+}