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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_macho"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* private implementation
*/
tb_bool_t xm_binutils_macho_read_symbols_32(tb_stream_ref_t istream, tb_hize_t base_offset, lua_State *lua, xm_macho_context_t* context) {
tb_assert_and_check_return_val(istream && lua && context, tb_false);
// find LC_SYMTAB command
xm_macho_symtab_command_t symtab_cmd;
tb_bool_t found_symtab = tb_false;
tb_uint32_t offset = sizeof(xm_macho_header_32_t);
for (tb_uint32_t i = 0; i < context->ncmds; i++) {
tb_uint32_t cmd;
tb_uint32_t cmdsize;
if (!tb_stream_seek(istream, base_offset + offset)) {
return tb_false;
}
if (!tb_stream_bread(istream, (tb_byte_t*)&cmd, 4)) {
return tb_false;
}
if (!tb_stream_bread(istream, (tb_byte_t*)&cmdsize, 4)) {
return tb_false;
}
if (context->swap) {
cmd = tb_bits_swap_u32(cmd);
cmdsize = tb_bits_swap_u32(cmdsize);
}
if (cmd == XM_MACHO_LC_SYMTAB) {
if (!tb_stream_seek(istream, base_offset + offset)) {
return tb_false;
}
if (!tb_stream_bread(istream, (tb_byte_t*)&symtab_cmd, sizeof(symtab_cmd))) {
return tb_false;
}
xm_binutils_macho_swap_symtab_command(&symtab_cmd, context->swap);
found_symtab = tb_true;
break;
}
offset += cmdsize;
}
if (!found_symtab) {
lua_newtable(lua);
return tb_true;
}
// create result table
lua_newtable(lua);
// read symbols
if (!tb_stream_seek(istream, base_offset + symtab_cmd.symoff)) {
return tb_false;
}
tb_uint32_t result_count = 0;
for (tb_uint32_t i = 0; i < symtab_cmd.nsyms; i++) {
xm_macho_nlist_t nlist;
if (!tb_stream_bread(istream, (tb_byte_t*)&nlist, sizeof(nlist))) {
return tb_false;
}
xm_binutils_macho_swap_nlist_32(&nlist, context->swap);
// skip NULL symbols
if (nlist.strx == 0) {
continue;
}
// get symbol name
tb_char_t name[256];
if (!xm_binutils_macho_read_string(istream, base_offset + symtab_cmd.stroff, nlist.strx, name, sizeof(name)) || !name[0]) {
continue;
}
// skip internal symbols (starting with .)
if (name[0] == '.') {
continue;
}
// create symbol table entry
lua_pushinteger(lua, result_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_macho_get_symbol_type_char(nlist.type, nlist.sect);
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);
result_count++;
}
return tb_true;
}
tb_bool_t xm_binutils_macho_read_symbols_64(tb_stream_ref_t istream, tb_hize_t base_offset, lua_State *lua, xm_macho_context_t* context) {
tb_assert_and_check_return_val(istream && lua && context, tb_false);
// find LC_SYMTAB command
xm_macho_symtab_command_t symtab_cmd;
tb_bool_t found_symtab = tb_false;
tb_uint32_t offset = sizeof(xm_macho_header_64_t);
for (tb_uint32_t i = 0; i < context->ncmds; i++) {
tb_uint32_t cmd;
tb_uint32_t cmdsize;
if (!tb_stream_seek(istream, base_offset + offset)) {
return tb_false;
}
if (!tb_stream_bread(istream, (tb_byte_t*)&cmd, 4)) {
return tb_false;
}
if (!tb_stream_bread(istream, (tb_byte_t*)&cmdsize, 4)) {
return tb_false;
}
if (context->swap) {
cmd = tb_bits_swap_u32(cmd);
cmdsize = tb_bits_swap_u32(cmdsize);
}
if (cmd == XM_MACHO_LC_SYMTAB) {
if (!tb_stream_seek(istream, base_offset + offset)) {
return tb_false;
}
if (!tb_stream_bread(istream, (tb_byte_t*)&symtab_cmd, sizeof(symtab_cmd))) {
return tb_false;
}
xm_binutils_macho_swap_symtab_command(&symtab_cmd, context->swap);
found_symtab = tb_true;
break;
}
offset += cmdsize;
}
if (!found_symtab) {
lua_newtable(lua);
return tb_true;
}
// create result table
lua_newtable(lua);
// read symbols
if (!tb_stream_seek(istream, base_offset + symtab_cmd.symoff)) {
return tb_false;
}
tb_uint32_t result_count = 0;
for (tb_uint32_t i = 0; i < symtab_cmd.nsyms; i++) {
xm_macho_nlist_64_t nlist;
if (!tb_stream_bread(istream, (tb_byte_t*)&nlist, sizeof(nlist))) {
return tb_false;
}
xm_binutils_macho_swap_nlist_64(&nlist, context->swap);
// skip NULL symbols
if (nlist.strx == 0) {
continue;
}
// get symbol name
tb_char_t name[256];
if (!xm_binutils_macho_read_string(istream, base_offset + symtab_cmd.stroff, nlist.strx, name, sizeof(name)) || !name[0]) {
continue;
}
// skip internal symbols (starting with .)
if (name[0] == '.') {
continue;
}
// create symbol table entry
lua_pushinteger(lua, result_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_macho_get_symbol_type_char(nlist.type, nlist.sect);
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);
result_count++;
}
return tb_true;
}
tb_bool_t xm_binutils_macho_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);
// init Mach-O context
xm_macho_context_t context;
if (!xm_binutils_macho_context_init(istream, base_offset, &context)) {
return tb_false;
}
if (!context.is64) {
return xm_binutils_macho_read_symbols_32(istream, base_offset, lua, &context);
} else {
return xm_binutils_macho_read_symbols_64(istream, base_offset, lua, &context);
}
}
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