First commit

1 files changed, 81 insertions, 0 deletions

diff --git a/src/start.c b/src/start.c
new file mode 100644
index 0000000..c22bddf
--- /dev/null
+++ b/src/start.c
@@ -0,0 +1,81 @@
+/*
+ * 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 <nw/search.h>
+#include <nw/sections.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+int nw_start(const struct nw_inst_cfg *const icfg, struct nw_inst *const i)
+{
+    int ret = -1;
+    const struct nw_mod *const m = icfg->interp.m;
+    const struct nw_mod_cfg *const mcfg = &m->cfg;
+    FILE *const f = fopen(mcfg->path, "rb");
+    struct search_fn fn;
+    struct nw_frame fr = {0};
+
+    *i = (const struct nw_inst){0};
+
+    if (!f)
+    {
+        LOG("%s: fopen(3) %s: %s\n", __func__, mcfg->path, strerror(errno));
+        goto end;
+    }
+    else if (m->sections.start)
+    {
+        /* TODO. */
+    }
+    else if (interp_start(&icfg->interp, f, &i->interp))
+    {
+        LOG("%s: interp_start failed\n", __func__);
+        goto end;
+    }
+    else if (search_exported_fn("_start", m, f, &fn))
+    {
+        LOG("%s: search_exported_fn failed\n", __func__);
+        goto end;
+    }
+    else if (section_global_push(f, m, &i->interp))
+    {
+        LOG("%s: section_global_push failed\n", __func__);
+        goto end;
+    }
+    else if (section_type_push(f, m, fn.index, &fr))
+    {
+        LOG("%s: section_type_push failed\n", __func__);
+        goto end;
+    }
+    else if (section_code_push(f, fn.start, &fr))
+    {
+        LOG("%s: section_code_push failed\n", __func__);
+        goto end;
+    }
+    else if (interp_push(&i->interp, &fr))
+    {
+        LOG("%s: interp_push failed\n", __func__);
+        goto end;
+    }
+
+    ret = 0;
+
+end:
+
+    if (ret && f && fclose(f))
+    {
+        LOG("%s: fclose(3) %s: %s\n", __func__, mcfg->path, strerror(errno));
+        ret = -1;
+    }
+
+    return ret;
+}