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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 <nanowasm/types.h>
#include <nw/linear.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_index(struct nw_inst *);
static enum nw_state get_byte(struct nw_inst *);
static enum nw_state store_byte(struct nw_inst *const inst)
{
struct nw_inst_sm_d *const d = &inst->sm.data;
struct nw_interp *const i = &inst->interp;
const unsigned long offset = d->offset + d->bytes_i;
const enum nw_state n = nwp_linear_store(i, &d->io, offset);
if (n)
return n;
else if (++d->bytes_i >= d->size)
inst->next = ++d->entry_i >= d->count ? d->next : get_index;
else
inst->next = get_byte;
return NW_AGAIN;
}
static enum nw_state get_byte(struct nw_inst *const inst)
{
struct nw_inst_sm_d *const d = &inst->sm.data;
struct nw_interp *const i = &inst->interp;
const struct nw_io_cfg *const cfg = &i->cfg.io;
struct nw_sm_io io = {0};
enum nw_state n;
io.buf = &d->b;
io.n = sizeof d->b;
if ((n = nwp_io_read(cfg, &io, cfg->user)))
return n;
else
{
struct nw_sm_io io = {0};
io.buf = &d->b;
io.n = sizeof d->b;
d->io = io;
}
inst->next = store_byte;
return NW_AGAIN;
}
static enum nw_state get_size(struct nw_inst *const inst)
{
struct nw_inst_sm_d *const d = &inst->sm.data;
struct nw_sm_leb128 *const l = &d->leb128;
struct nw_interp *const i = &inst->interp;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varuint32(cfg, l, &d->size, cfg->user);
if (n)
return n;
d->bytes_i = 0;
inst->next = get_byte;
return NW_AGAIN;
}
static enum nw_state pop(struct nw_inst *const inst)
{
struct nw_inst_sm_d *const d = &inst->sm.data;
const enum nw_state n = nwp_stack_pop(&inst->interp, &d->io);
if (n)
return n;
inst->next = get_size;
return NW_AGAIN;
}
static enum nw_state loop(struct nw_inst *const inst)
{
struct nw_inst_sm_d *const d = &inst->sm.data;
const enum nw_state n = nwp_interp_run(&inst->interp);
struct nw_sm_io io = {0};
if (n)
return n;
io.buf = &d->offset;
io.n = sizeof d->offset;
d->io = io;
inst->next = pop;
return NW_AGAIN;
}
static enum nw_state setup_initexpr(struct nw_inst *const inst)
{
struct nw_interp *const i = &inst->interp;
const struct nw_interp_cfg icfg = i->cfg;
if (nwp_interp_start(i, &icfg, &nwp_interp_data_set))
{
#ifdef NW_LOG
nwp_log("nw_interp_start failed\n");
#endif
return NW_FATAL;
}
inst->next = loop;
return NW_AGAIN;
}
static enum nw_state get_index(struct nw_inst *const inst)
{
struct nw_inst_sm_d *const d = &inst->sm.data;
struct nw_sm_leb128 *const l = &d->leb128;
struct nw_interp *const i = &inst->interp;
const struct nw_io_cfg *const cfg = &i->cfg.io;
const enum nw_state n = nwp_varuint32(cfg, l, &d->index, cfg->user);
if (n)
return n;
return setup_initexpr(inst);
}
static enum nw_state get_count(struct nw_inst *const i)
{
struct nw_inst_sm_d *const d = &i->sm.data;
struct nw_sm_leb128 *const l = &d->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->data_count;
const enum nw_state n = nwp_varuint32(cfg, l, &d->count, cfg->user);
if (n)
return n;
else if (d->count != expected)
{
#ifdef NW_LOG
static const char *const exc = "data count mismatch";
nwp_log("%s, expected %lu, got %lu\n", exc,
(unsigned long)expected, (unsigned long)d->count);
#endif
return NW_FATAL;
}
i->next = d->count ? get_index : d->next;
return NW_AGAIN;
}
static enum nw_state seek_data(struct nw_inst *const i)
{
struct nw_inst_sm_gl *const d = &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_DATA];
enum nw_state n;
if (!offset)
{
i->next = d->next;
return NW_AGAIN;
}
else if ((n = cfg->seek(offset, cfg->user)))
return n;
i->next = get_count;
return NW_AGAIN;
}
void nwp_init_data(struct nw_inst *const i,
enum nw_state (*const next)(struct nw_inst *))
{
const struct nw_inst_sm_d d = {0};
struct nw_inst_sm_d *const p = &i->sm.data;
*p = d;
p->next = next;
i->next = seek_data;
}
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