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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/interp.h>
#include <nw/io.h>
#include <nw/log.h>
#include <nw/ops.h>
#include <nw/routines.h>
#include <nw/stack.h>
static enum nw_state pop(struct nw_interp *const i)
{
struct nw_i_sm_gm *const gm = &i->sm.gm;
const unsigned long max = i->cfg.m->out.linear.max;
const enum nw_state n = nwp_stack_pop(i, &gm->io);
if (n)
return n;
else if (gm->pages > max || i->linear.n_pages > max - gm->pages)
{
static const char *const exc = "cannot grow linear memory pages";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %#lx\n", exc, (unsigned long)gm->pages);
#endif
return NW_FATAL;
}
i->linear.n_pages += gm->pages;
nwp_interp_resume(i);
return NW_AGAIN;
}
static enum nw_state get_reserved(struct nw_interp *const i)
{
nw_varuint1 reserved;
struct nw_i_sm_gm *const gm = &i->sm.gm;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varuint1(cfg, &gm->leb128, &reserved, cfg->user);
if (n)
return n;
else if (reserved)
{
static const char *const exc = "invalid reserved value";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %#x\n", exc, (unsigned)reserved);
#endif
return NW_FATAL;
}
else
{
struct nw_sm_io io = {0};
io.buf = &gm->pages;
io.n = sizeof gm->pages;
gm->io = io;
}
i->next = pop;
return NW_AGAIN;
}
void nwp_op_grow_memory(struct nw_interp *const i)
{
static const struct nw_i_sm_gm gm;
struct nw_i_sm_gm *const pgm = &i->sm.gm;
*pgm = gm;
i->next = get_reserved;
}
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