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/*!A cross-platform build utility based on Lua
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright (C) 2015-present, Xmake Open Source Community.
*
* @author ruki
* @file prefix.h
*
*/
#ifndef XM_BINUTILS_WASM_PREFIX_H
#define XM_BINUTILS_WASM_PREFIX_H
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "../prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* macros
*/
// wasm file magic: \0asm
#define XM_WASM_MAGIC0 0x00
#define XM_WASM_MAGIC1 0x61
#define XM_WASM_MAGIC2 0x73
#define XM_WASM_MAGIC3 0x6d
// wasm header size: magic(4) + version(4)
#define XM_WASM_HEADER_SIZE 8
// wasm section ids
#define XM_WASM_SECTION_IMPORT 2
#define XM_WASM_SECTION_EXPORT 7
// wasm custom section names
#define XM_WASM_CUSTOM_LINKING "linking"
#define XM_WASM_CUSTOM_NAME "name"
// wasm import/export kinds
#define XM_WASM_KIND_FUNC 0
#define XM_WASM_KIND_TABLE 1
#define XM_WASM_KIND_MEMORY 2
#define XM_WASM_KIND_GLOBAL 3
#define XM_WASM_KIND_TAG 4
// wasm limits flags
#define XM_WASM_LIMITS_HAS_MAX 0x01
#define XM_WASM_LIMITS_MEM64 0x04
// leb128 max bytes
#define XM_WASM_U32_LEB_MAX 5
#define XM_WASM_U64_LEB_MAX 10
// linking custom section
#define XM_WASM_LINKING_VERSION_2 2
#define XM_WASM_LINKING_SUBSEC_SYMTAB 8
// symbol table kinds (linking section)
#define XM_WASM_SYMTAB_KIND_FUNCTION 0
#define XM_WASM_SYMTAB_KIND_DATA 1
#define XM_WASM_SYMTAB_KIND_GLOBAL 2
#define XM_WASM_SYMTAB_KIND_SECTION 3
#define XM_WASM_SYMTAB_KIND_EVENT 4
#define XM_WASM_SYMTAB_KIND_TABLE 5
#define XM_WASM_SYMTAB_KIND_TAG 6
// symbol table flags (linking section)
#define XM_WASM_SYMTAB_FLAG_UNDEFINED 0x10
// symbol types for binutils.readsyms
#define XM_WASM_SYM_UNDEF "U"
#define XM_WASM_SYM_TEXT "T"
#define XM_WASM_SYM_DATA "D"
/* //////////////////////////////////////////////////////////////////////////////////////
* inline implementation
*/
// decode unsigned leb128 (u32) from current stream offset
static __tb_inline__ tb_bool_t xm_binutils_wasm_read_u32_leb(tb_stream_ref_t istream, tb_uint32_t* out) {
tb_uint32_t result = 0;
tb_uint32_t shift = 0;
tb_byte_t byte = 0;
for (tb_size_t i = 0; i < XM_WASM_U32_LEB_MAX; i++) {
if (!tb_stream_bread(istream, &byte, 1)) {
return tb_false;
}
result |= ((tb_uint32_t)(byte & 0x7f)) << shift;
if (!(byte & 0x80)) {
*out = result;
return tb_true;
}
shift += 7;
}
return tb_false;
}
// decode unsigned leb128 (u64) from current stream offset
static __tb_inline__ tb_bool_t xm_binutils_wasm_read_u64_leb(tb_stream_ref_t istream, tb_uint64_t* out) {
tb_uint64_t result = 0;
tb_uint32_t shift = 0;
tb_byte_t byte = 0;
for (tb_size_t i = 0; i < XM_WASM_U64_LEB_MAX; i++) {
if (!tb_stream_bread(istream, &byte, 1)) {
return tb_false;
}
result |= ((tb_uint64_t)(byte & 0x7f)) << shift;
if (!(byte & 0x80)) {
*out = result;
return tb_true;
}
shift += 7;
}
return tb_false;
}
// read wasm "name" (u32 leb length + bytes), truncate to fit buffer and skip remaining bytes
static __tb_inline__ tb_bool_t xm_binutils_wasm_read_name(tb_stream_ref_t istream, tb_char_t* name, tb_size_t name_size) {
tb_uint32_t len = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &len)) {
return tb_false;
}
tb_size_t readn = (tb_size_t)tb_min((tb_uint32_t)(name_size > 0 ? name_size - 1 : 0), len);
if (readn && !tb_stream_bread(istream, (tb_byte_t*)name, readn)) {
return tb_false;
}
if (name_size) {
name[readn] = '\0';
}
if (len > readn) {
if (!tb_stream_skip(istream, (tb_hize_t)(len - readn))) {
return tb_false;
}
}
return tb_true;
}
// skip wasm limits used by table/memory types, supports wasm32 and wasm64(memory64)
static __tb_inline__ tb_bool_t xm_binutils_wasm_skip_limits(tb_stream_ref_t istream) {
tb_uint32_t flags = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &flags)) {
return tb_false;
}
if (flags & XM_WASM_LIMITS_MEM64) {
tb_uint64_t tmp64 = 0;
if (!xm_binutils_wasm_read_u64_leb(istream, &tmp64)) {
return tb_false;
}
if (flags & XM_WASM_LIMITS_HAS_MAX) {
if (!xm_binutils_wasm_read_u64_leb(istream, &tmp64)) {
return tb_false;
}
}
} else {
tb_uint32_t tmp32 = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &tmp32)) {
return tb_false;
}
if (flags & XM_WASM_LIMITS_HAS_MAX) {
if (!xm_binutils_wasm_read_u32_leb(istream, &tmp32)) {
return tb_false;
}
}
}
return tb_true;
}
// add one symbol table entry: {name=..., type=...}
static __tb_inline__ tb_void_t xm_binutils_wasm_add_symbol(lua_State* lua, tb_size_t* result_count, tb_char_t const* name, tb_char_t const* type) {
lua_pushinteger(lua, (lua_Integer)(*result_count + 1));
lua_newtable(lua);
lua_pushstring(lua, "name");
lua_pushstring(lua, name);
lua_settable(lua, -3);
lua_pushstring(lua, "type");
lua_pushstring(lua, type);
lua_settable(lua, -3);
lua_settable(lua, -3);
(*result_count)++;
}
// seek and validate wasm header at base_offset, leave stream offset after header
static __tb_inline__ tb_bool_t xm_binutils_wasm_check_header(tb_stream_ref_t istream, tb_hize_t base_offset) {
if (!tb_stream_seek(istream, base_offset)) {
return tb_false;
}
tb_uint8_t header[XM_WASM_HEADER_SIZE];
if (!tb_stream_bread(istream, header, XM_WASM_HEADER_SIZE)) {
return tb_false;
}
if (header[0] != XM_WASM_MAGIC0 || header[1] != XM_WASM_MAGIC1 || header[2] != XM_WASM_MAGIC2 || header[3] != XM_WASM_MAGIC3) {
return tb_false;
}
return tb_true;
}
#endif
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