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/*
* 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;
i->sm.set_global = g;
i->next = get_index;
}
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