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/*
* 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 (fseek(f, fn.start, SEEK_SET))
{
LOG("%s: fseek(3): %s\n", __func__, strerror(errno));
return -1;
}
else if (section_code_push(f, &fr))
{
LOG("%s: section_code_push failed\n", __func__);
goto end;
}
#if 0
else if (interp_push(&i->interp, &fr))
{
LOG("%s: interp_push failed\n", __func__);
goto end;
}
#endif
ret = 0;
end:
if (ret && f && fclose(f))
{
LOG("%s: fclose(3) %s: %s\n", __func__, mcfg->path, strerror(errno));
ret = -1;
}
return ret;
}
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