我正在尝试从dwarf信息中打印DW_AT_data_member_location属性值,以获取结构体变量的偏移量
,但是没有任何辅助函数能够解决问题。
这是来自objdump
的dwarf_info:
<1><1bf>: Abbrev Number: 5 (DW_TAG_structure_type)
<1c0> DW_AT_name : (indirect string, offset: 0xf0): class
<1c4> DW_AT_byte_size : 208
<1c5> DW_AT_decl_file : 1
<1c6> DW_AT_decl_line : 10
<1c7> DW_AT_sibling : <0x1f8>
<2><1cb>: Abbrev Number: 6 (DW_TAG_member)
<1cc> DW_AT_name : (indirect string, offset: 0xc7): schools
<1d0> DW_AT_decl_file : 1
<1d1> DW_AT_decl_line : 11
<1d2> DW_AT_type : <0x1f8>
<1d6> DW_AT_data_member_location: 2 byte block: 23 0 (DW_OP_plus_uconst: 0)
<2><1d9>: Abbrev Number: 6 (DW_TAG_member)
<1da> DW_AT_name : (indirect string, offset: 0xd8): size
<1de> DW_AT_decl_file : 1
<1df> DW_AT_decl_line : 12
<1e0> DW_AT_type : <0x159>
<1e4> DW_AT_data_member_location: 3 byte block: 23 c8 1 (DW_OP_plus_uconst: 200)
<2><1e8>: Abbrev Number: 6 (DW_TAG_member)
<1e9> DW_AT_name : (indirect string, offset: 0xf6): record
<1ed> DW_AT_decl_file : 1
<1ee> DW_AT_decl_line : 13
<1ef> DW_AT_type : <0x1b8>
<1f3> DW_AT_data_member_location: 3 byte block: 23 cc 1 (DW_OP_plus_uconst: 204)
我能够获取属性代码,但无法获取属性值:
if(dwarf_whatattr(attrs[i],&attrcode,&error) != DW_DLV_OK)
printf("Error");
printf("Attrcode: %d\n",attrcode); // This one works
if(attrcode==DW_AT_data_member_location)
dwarf_formudata(attrs[i],&offset,0) // This one does not work
这个变量的类型是什么? 如何获取它的值? 哪个辅助函数可以使用?