On Tue, Aug 31, 2021 at 4:30 AM Poonai <rbalaji...@gmail.com> wrote: > > I'm trying to learn how debugger works. With the help of this blog > https://eli.thegreenplace.net/2011/01/27/how-debuggers-work-part-2-breakpoints > I'm able to set breakpoint and continue. > > In the next step of learning, I wanted to learn how to extract values of > variables. > > But, the dwarf output says the frame base addrs as: 1 byte block: 9c > (DW_OP_call_frame_cfa) > > <0><48a28>: Abbrev Number: 1 (DW_TAG_compile_unit) > <48a29> DW_AT_name : main > <48a2e> DW_AT_language : 22 (Go) > <48a2f> DW_AT_stmt_list : 0x26b2c > <48a33> DW_AT_low_pc : 0x498200 > <48a3b> DW_AT_ranges : 0x28a70 > <48a3f> DW_AT_comp_dir : . > <48a41> DW_AT_producer : Go cmd/compile go1.16.6; -N -l > <48a60> Unknown AT value: 2905: main > <1><48a65>: Abbrev Number: 3 (DW_TAG_subprogram) > <48a66> DW_AT_name : main.main > <48a70> DW_AT_low_pc : 0x498200 > <48a78> DW_AT_high_pc : 0x4982e5 > <48a80> DW_AT_frame_base : 1 byte block: 9c (DW_OP_call_frame_cfa) > <48a82> DW_AT_decl_file : 0x2 > <48a86> DW_AT_external : 1 > <2><48a87>: Abbrev Number: 21 (DW_TAG_lexical_block) > <48a88> DW_AT_low_pc : 0x498223 > <48a90> DW_AT_high_pc : 0x4982d9 > <3><48a98>: Abbrev Number: 10 (DW_TAG_variable) > <48a99> DW_AT_name : variableToTrace > <48aa9> DW_AT_decl_line : 11 > <48aaa> DW_AT_type : <0x4ab9f> > <48aae> DW_AT_location : 3 byte block: 91 b0 7f (DW_OP_fbreg: -80) > > I wanted to readt variableToTrace. to my understanding, I can read the > variable from CFA-80 > > But don't know how to calculate CFA. > > Can anyone help me with this?
You are looking at the debug_info information, which describes a lot of things but doesn't describe the call frame. To see the call frame information use "readelf --debug=frames" or "readelf --debug=frames-interp". Ian -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAOyqgcWGHNy%3DbEgEZ7nqSwGidgcTPrFC-R_cfoCjxpEGXLRdQg%40mail.gmail.com.
