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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 <nw/interp.h>
#include <nw/io.h>
#include <nw/log.h>
#include <nw/opcodes.h>
#include <nw/ops.h>
#include <nw/stack.h>
#include <nw/types.h>
static enum nw_state pop(struct nw_interp *const i)
{
struct nw_i_sm_drop *const d = &i->sm.drop;
const enum nw_state n = nwp_stack_pop(i, &d->io);
if (n)
return n;
nwp_interp_resume(i);
return NW_AGAIN;
}
static enum nw_state check(struct nw_interp *const i)
{
struct nw_i_sm_drop *const d = &i->sm.drop;
const struct nw_frame *const fr = &i->fr;
const struct nw_return *const r = &fr->prev_ret;
const unsigned char prev = fr->prev_op;
size_t sz;
if (prev != OP_CALL && prev != OP_CALL_INDIRECT)
{
static const char *const exc =
"expected call or call_indirect before drop";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s, got: %#x\n", exc, (unsigned)prev);
#endif
return NW_FATAL;
}
else if (!r->count)
{
static const char *const exc =
"called drop from function without return value";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s\n", exc);
#endif
return NW_FATAL;
}
else if (r->type != i->push_type)
{
static const char *const exc =
"mismatch between return type and last push type";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s, expected: %#hhx, got: %#hhx\n", exc,
(unsigned char)i->push_type, (unsigned char)r->type);
#endif
return NW_FATAL;
}
else if (nwp_type_sz(r->type, &sz))
{
static const char *const exc = "invalid return type";
i->exception = exc;
#ifdef NW_LOG
nwp_log("%s: %#x\n", exc, (unsigned)r->type);
#endif
return NW_FATAL;
}
else
{
struct nw_sm_io io = {0};
io.buf = &d->value;
io.n = sz;
d->io = io;
i->next = pop;
}
return NW_AGAIN;
}
void nwp_op_drop(struct nw_interp *const i)
{
const struct nw_i_sm_drop d = {{0}};
i->sm.drop = d;
i->next = check;
}
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