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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/.
*/
#ifndef NANOWASM_TYPES_H
#define NANOWASM_TYPES_H
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#ifdef __cplusplus
extern "C"
{
#endif
union nw_value
{
long i32;
long long i64;
float f32;
double f64;
/* TODO: define {de}serialization between Wasm and host. */
void *p;
};
enum nw_kind
{
NW_KIND_FUNCTION,
NW_KIND_TABLE,
NW_KIND_MEMORY,
NW_KIND_GLOBAL
};
struct nw_args
{
const union nw_value *args;
size_t n;
};
struct nw_buf
{
void *buf;
size_t n;
};
enum nw_state
{
NW_STATE_AGAIN,
NW_STATE_RETURNED,
NW_STATE_EXCEPTION,
NW_STATE_FATAL
};
struct nw_mod_cfg
{
const struct nw_import
{
enum nw_kind kind;
const char *module, *field;
union
{
struct
{
/* This must follow the format below, whitespace ignored:
* [return type]([param type][, ...])
* For convenience, the interpreter can do automatic checks on
* pointer arguments and/or return values if using '*' as type.
* Examples:
* "()"
* "i32(f32)"
* "*(f64, i32, *, i64)"
* As per WebAssembly MVP spec, multiple return types are not
* supported yet. */
const char *signature;
int (*fn)(const struct nw_args *params,
union nw_value *ret, void *user);
} function;
} u;
} *imports;
size_t n_imports;
const char *path;
void *user;
};
struct nw_interp_cfg
{
struct nw_buf stack, heap, global;
const struct nw_mod *m;
};
struct nw_inst_cfg
{
struct nw_interp_cfg interp;
};
struct nw_mod
{
struct nw_sections
{
long type, import, function, table, memory, global, export,
start, element, code, data;
} sections;
size_t data_len, heap_len;
struct nw_mod_cfg cfg;
};
struct nw_inst
{
struct nw_interp
{
const struct nw_mod *m;
FILE *f;
const char *exception;
bool exit;
int retval;
struct nw_interp_cfg cfg;
size_t stack_i, global_i;
struct nw_frame *fp;
struct nw_gframe *gfp;
} interp;
union nw_inst_state
{
long retval;
const char *exception;
} state;
};
#define NW_BUF(sz) {.buf = (char [sz]){0}, .n = sz}
#ifdef __cplusplus
}
#endif
#endif
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