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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 readsyms.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "wasm_readsyms"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
static tb_bool_t xm_binutils_wasm_parse_linking_symtab(tb_stream_ref_t istream, tb_hize_t payload_end, lua_State* lua, tb_size_t* result_count) {
tb_uint32_t symcount = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &symcount)) {
return tb_false;
}
for (tb_uint32_t i = 0; i < symcount; i++) {
tb_byte_t kind = 0;
if (!tb_stream_bread(istream, &kind, 1)) {
return tb_false;
}
tb_uint32_t flags = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &flags)) {
return tb_false;
}
tb_bool_t is_undef = (flags & XM_WASM_SYMTAB_FLAG_UNDEFINED) != 0;
tb_char_t name[256] = {0};
if (kind == XM_WASM_SYMTAB_KIND_FUNCTION || kind == XM_WASM_SYMTAB_KIND_GLOBAL ||
kind == XM_WASM_SYMTAB_KIND_EVENT || kind == XM_WASM_SYMTAB_KIND_TABLE ||
kind == XM_WASM_SYMTAB_KIND_TAG) {
if (!is_undef) {
tb_uint32_t index = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &index)) {
return tb_false;
}
}
if (!xm_binutils_wasm_read_name(istream, name, sizeof(name))) {
return tb_false;
}
} else if (kind == XM_WASM_SYMTAB_KIND_DATA) {
if (!xm_binutils_wasm_read_name(istream, name, sizeof(name))) {
return tb_false;
}
if (!is_undef) {
tb_uint32_t tmp = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &tmp)) { // segment
return tb_false;
}
if (!xm_binutils_wasm_read_u32_leb(istream, &tmp)) { // offset
return tb_false;
}
if (!xm_binutils_wasm_read_u32_leb(istream, &tmp)) { // size
return tb_false;
}
}
} else if (kind == XM_WASM_SYMTAB_KIND_SECTION) {
tb_uint32_t section_index = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, §ion_index)) {
return tb_false;
}
if (!xm_binutils_wasm_read_name(istream, name, sizeof(name))) {
return tb_false;
}
} else {
return tb_false;
}
if (name[0]) {
tb_char_t const* type = XM_WASM_SYM_DATA;
if (is_undef) {
type = XM_WASM_SYM_UNDEF;
} else if (kind == XM_WASM_SYMTAB_KIND_FUNCTION) {
type = XM_WASM_SYM_TEXT;
}
xm_binutils_wasm_add_symbol(lua, result_count, name, type);
}
if (tb_stream_offset(istream) > payload_end) {
return tb_false;
}
}
return tb_true;
}
static tb_bool_t xm_binutils_wasm_parse_custom_linking(tb_stream_ref_t istream, tb_hize_t payload_end, lua_State* lua, tb_size_t* result_count) {
tb_uint32_t version = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &version)) {
return tb_false;
}
while (tb_stream_offset(istream) < payload_end) {
tb_byte_t subsec_type = 0;
if (!tb_stream_bread(istream, &subsec_type, 1)) {
return tb_false;
}
tb_uint32_t subsec_size = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &subsec_size)) {
return tb_false;
}
tb_hize_t subsec_end = tb_stream_offset(istream) + (tb_hize_t)subsec_size;
if (subsec_end > payload_end) {
return tb_false;
}
if (subsec_type == XM_WASM_LINKING_SUBSEC_SYMTAB) {
if (!xm_binutils_wasm_parse_linking_symtab(istream, subsec_end, lua, result_count)) {
return tb_false;
}
}
if (tb_stream_offset(istream) < subsec_end) {
if (!tb_stream_seek(istream, subsec_end)) {
return tb_false;
}
}
}
return version > 0 ? tb_true : tb_false;
}
static tb_bool_t xm_binutils_wasm_parse_custom_name(tb_stream_ref_t istream, tb_hize_t payload_end, lua_State* lua, tb_size_t* result_count) {
// only use the name section as a fallback when we have no symbols yet
if (*result_count != 0) {
return tb_true;
}
while (tb_stream_offset(istream) < payload_end) {
tb_byte_t subsec_type = 0;
if (!tb_stream_bread(istream, &subsec_type, 1)) {
return tb_false;
}
tb_uint32_t subsec_size = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &subsec_size)) {
return tb_false;
}
tb_hize_t subsec_end = tb_stream_offset(istream) + (tb_hize_t)subsec_size;
if (subsec_end > payload_end) {
return tb_false;
}
if (subsec_type == 1) {
tb_uint32_t count = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &count)) {
return tb_false;
}
for (tb_uint32_t i = 0; i < count; i++) {
tb_uint32_t index = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &index)) {
return tb_false;
}
tb_char_t name[256] = {0};
if (!xm_binutils_wasm_read_name(istream, name, sizeof(name))) {
return tb_false;
}
if (name[0]) {
xm_binutils_wasm_add_symbol(lua, result_count, name, XM_WASM_SYM_TEXT);
}
if (tb_stream_offset(istream) > subsec_end) {
return tb_false;
}
}
}
if (tb_stream_offset(istream) < subsec_end) {
if (!tb_stream_seek(istream, subsec_end)) {
return tb_false;
}
}
}
return tb_true;
}
/* //////////////////////////////////////////////////////////////////////////////////////
* interfaces
*/
tb_bool_t xm_binutils_wasm_read_symbols(tb_stream_ref_t istream, tb_hize_t base_offset, lua_State *lua) {
tb_assert_and_check_return_val(istream && lua, tb_false);
if (!xm_binutils_wasm_check_header(istream, base_offset)) {
return tb_false;
}
lua_newtable(lua);
tb_size_t result_count = 0;
// parse wasm sections until EOF, collect imports/exports as symbols
for (;;) {
tb_byte_t section_id = 0;
if (!tb_stream_bread(istream, §ion_id, 1)) {
break;
}
tb_uint32_t payload_len = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &payload_len)) {
break;
}
tb_hize_t payload_start = tb_stream_offset(istream);
tb_hize_t payload_end = payload_start + (tb_hize_t)payload_len;
if (payload_len == 0) {
continue;
}
if (section_id == 0) {
// custom section: name + custom payload
tb_char_t custom_name[64] = {0};
if (!xm_binutils_wasm_read_name(istream, custom_name, sizeof(custom_name))) {
break;
}
if (!tb_strcmp(custom_name, XM_WASM_CUSTOM_LINKING)) {
if (!xm_binutils_wasm_parse_custom_linking(istream, payload_end, lua, &result_count)) {
break;
}
} else if (!tb_strcmp(custom_name, XM_WASM_CUSTOM_NAME)) {
if (!xm_binutils_wasm_parse_custom_name(istream, payload_end, lua, &result_count)) {
break;
}
}
} else if (section_id == XM_WASM_SECTION_IMPORT) {
// import section: (vec import), each import => undefined symbol
tb_uint32_t count = 0;
if (xm_binutils_wasm_read_u32_leb(istream, &count)) {
for (tb_uint32_t i = 0; i < count; i++) {
tb_char_t module[256] = {0};
tb_char_t field[256] = {0};
if (!xm_binutils_wasm_read_name(istream, module, sizeof(module))) {
break;
}
if (!xm_binutils_wasm_read_name(istream, field, sizeof(field))) {
break;
}
tb_byte_t kind = 0;
if (!tb_stream_bread(istream, &kind, 1)) {
break;
}
tb_uint32_t tmp = 0;
if (kind == XM_WASM_KIND_FUNC) {
// type index (u32)
if (!xm_binutils_wasm_read_u32_leb(istream, &tmp)) {
break;
}
} else if (kind == XM_WASM_KIND_TABLE) {
// table type: elemtype + limits
if (!tb_stream_bread(istream, (tb_byte_t*)&kind, 1)) {
break;
}
if (!xm_binutils_wasm_skip_limits(istream)) {
break;
}
} else if (kind == XM_WASM_KIND_MEMORY) {
// memory type: limits
if (!xm_binutils_wasm_skip_limits(istream)) {
break;
}
} else if (kind == XM_WASM_KIND_GLOBAL) {
// global type: valtype + mut
tb_byte_t b = 0;
if (!tb_stream_bread(istream, &b, 1)) {
break;
}
if (!tb_stream_bread(istream, &b, 1)) {
break;
}
} else if (kind == XM_WASM_KIND_TAG) {
// tag: attribute + type index
if (!xm_binutils_wasm_read_u32_leb(istream, &tmp)) {
break;
}
} else {
break;
}
// keep consistent with nm-style output: use the imported field name as symbol name
if (field[0]) {
xm_binutils_wasm_add_symbol(lua, &result_count, field, XM_WASM_SYM_UNDEF);
} else if (module[0]) {
xm_binutils_wasm_add_symbol(lua, &result_count, module, XM_WASM_SYM_UNDEF);
}
}
}
} else if (section_id == XM_WASM_SECTION_EXPORT) {
// export section: (vec export), each export => defined symbol
tb_uint32_t count = 0;
if (xm_binutils_wasm_read_u32_leb(istream, &count)) {
for (tb_uint32_t i = 0; i < count; i++) {
tb_char_t name[256] = {0};
if (!xm_binutils_wasm_read_name(istream, name, sizeof(name))) {
break;
}
tb_byte_t kind = 0;
if (!tb_stream_bread(istream, &kind, 1)) {
break;
}
tb_uint32_t index = 0;
if (!xm_binutils_wasm_read_u32_leb(istream, &index)) {
break;
}
if (name[0]) {
// keep consistent with other formats: function => "T", others => "D"
tb_char_t const* type = XM_WASM_SYM_DATA;
if (kind == XM_WASM_KIND_FUNC) {
type = XM_WASM_SYM_TEXT;
}
xm_binutils_wasm_add_symbol(lua, &result_count, name, type);
}
}
}
}
// always seek to end of section payload to continue scanning
if (tb_stream_offset(istream) < payload_end) {
if (!tb_stream_seek(istream, payload_end)) {
break;
}
}
}
return tb_true;
}
|
