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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 "readsyms_coff"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* private implementation
*/
static tb_bool_t xm_binutils_coff_read_import_symbols(tb_stream_ref_t istream, tb_hize_t base_offset, lua_State *lua, xm_coff_header_t const* header) {
// create result table
lua_newtable(lua);
/* check version
* version is the low 16 bits of the time field (offset 4)
* xm_coff_header_t: machine(2), nsects(2), time(4)
* xm_coff_import_header_t: sig1(2), sig2(2), version(2), machine(2)
*/
tb_uint16_t version = header->time & 0xffff;
if (version == 1) {
// anonymous object header (used for CLSID)
/*
* @note we can not read symbols from the anonymous object (LTO/GL/LTCG),
* because it does not contain the symbol table.
*/
xm_coff_anon_header_t anon_header;
if (!tb_stream_seek(istream, base_offset)) {
return tb_false;
}
if (!tb_stream_bread(istream, (tb_byte_t*)&anon_header, sizeof(anon_header))) {
return tb_false;
}
} else {
// import header
xm_coff_import_header_t import_header;
if (!tb_stream_seek(istream, base_offset)) {
return tb_false;
}
if (!tb_stream_bread(istream, (tb_byte_t*)&import_header, sizeof(import_header))) {
return tb_false;
}
// read symbol name (it follows the header)
tb_char_t name[256] = {0};
tb_size_t pos = 0;
tb_byte_t c;
while (pos < sizeof(name) - 1) {
if (!tb_stream_bread(istream, &c, 1)) {
break;
}
if (c == 0) {
break;
}
name[pos++] = (tb_char_t)c;
}
name[pos] = '\0';
if (name[0]) {
lua_pushinteger(lua, 1);
lua_newtable(lua);
// name
lua_pushstring(lua, "name");
lua_pushstring(lua, name);
lua_settable(lua, -3);
// type
lua_pushstring(lua, "type");
lua_pushstring(lua, "I");
lua_settable(lua, -3);
lua_settable(lua, -3);
}
}
return tb_true;
}
tb_bool_t xm_binutils_coff_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);
// read COFF header
xm_coff_header_t header;
if (!tb_stream_seek(istream, base_offset)) {
return tb_false;
}
if (!tb_stream_bread(istream, (tb_byte_t*)&header, sizeof(header))) {
return tb_false;
}
// check if it is an import object
if (header.machine == 0 && header.nsects == 0xffff) {
return xm_binutils_coff_read_import_symbols(istream, base_offset, lua, &header);
}
// check if there are symbols
if (header.nsyms == 0 || header.symtabofs == 0) {
lua_newtable(lua);
return tb_true;
}
// create result table
lua_newtable(lua);
// read string table offset (after symbol table)
tb_uint32_t strtab_offset = header.symtabofs + header.nsyms * 18; // each symbol is 18 bytes
// read section headers to determine section types
xm_coff_section_t *sections = tb_null;
if (header.nsects > 0) {
sections = (xm_coff_section_t*)tb_malloc(header.nsects * sizeof(xm_coff_section_t));
if (sections) {
tb_hize_t saved_pos = tb_stream_offset(istream);
// section headers are after COFF header and optional header
tb_uint32_t section_offset = sizeof(xm_coff_header_t) + (header.opthdr > 0 ? header.opthdr : 0);
if (tb_stream_seek(istream, base_offset + section_offset)) {
for (tb_uint16_t i = 0; i < header.nsects; i++) {
if (!tb_stream_bread(istream, (tb_byte_t*)§ions[i], sizeof(xm_coff_section_t))) {
break;
}
}
}
tb_stream_seek(istream, saved_pos);
}
}
// read symbols
if (!tb_stream_seek(istream, base_offset + header.symtabofs)) {
if (sections) {
tb_free(sections);
}
return tb_false;
}
tb_uint32_t sym_index = 0;
tb_uint32_t sym_count = 0;
while (sym_index < header.nsyms) {
// read symbol
xm_coff_symbol_t sym;
if (!tb_stream_bread(istream, (tb_byte_t*)&sym, sizeof(sym))) {
if (sections) {
tb_free(sections);
}
return tb_false;
}
tb_bool_t skip = tb_false;
tb_char_t name[256] = {0};
if (!xm_binutils_coff_get_symbol_name(istream, &sym, base_offset + strtab_offset, name, sizeof(name)) || !name[0]) {
skip = tb_true;
} else if (name[0] == '.') {
skip = tb_true;
} else if (tb_strchr(name, '$') != tb_null ||
tb_strstr(name, ".constprop") != tb_null ||
tb_strstr(name, ".startup") != tb_null ||
tb_strstr(name, "ta$") != tb_null) {
skip = tb_true;
}
if (!skip) {
// create symbol table entry
lua_pushinteger(lua, sym_count + 1);
lua_newtable(lua);
// name
lua_pushstring(lua, "name");
lua_pushstring(lua, name);
lua_settable(lua, -3);
// type (nm-style: T/t/D/d/B/b/U)
tb_char_t type_char = xm_binutils_coff_get_symbol_type_char(sym.scl, sym.sect, sections, header.nsects);
tb_char_t type_str[2] = {type_char, '\0'};
lua_pushstring(lua, "type");
lua_pushstring(lua, type_str);
lua_settable(lua, -3);
lua_settable(lua, -3);
sym_count++;
}
// skip to the next symbol, including auxiliary entries
sym_index++;
if (sym.naux > 0) {
sym_index += sym.naux;
if (!tb_stream_seek(istream, tb_stream_offset(istream) + sym.naux * 18)) {
if (sections) {
tb_free(sections);
}
return tb_false;
}
}
}
if (sections) {
tb_free(sections);
}
return tb_true;
}
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