[lldb-dev] target modules lookup

[jingham at apple.com]

No, that is not expected to work.  "target modules lookup" only looks up globally visible symbols and functions.  argc is a function argument, and not the sort of thing "target modules lookup" looks for.  If it did look for arguments (and locals???) it would be really really slow and probably produce way more output than you want.

Jim
On Jul 10, 2013, at 10:56 AM, Michael Sartain <mikesart at gmail.com> wrote:

> Is this supposed to work?
> 
> (lldb) target modules lookup -Av -s argc
> 
> It does nothing. Looking up the address of argc and using it also does nothing.
> 
> (lldb) p &argc
> (int *) $3 = 0x00007fff506c9458
> (lldb) target modules lookup -Av -a 0x00007fff506c9458
> 
> It does work with the function "main":
> 
> (lldb) target modules lookup -Av -F main
> 1 match found in /home/mikesart/data/src/blah/build/blah:
>         Address: blah[0x0000000000409970] (blah..text + 368)
>         Summary: blah`main at blah.cpp:160
>          Module: file = "/home/mikesart/data/src/blah/build/blah", arch = "x86_64"
>     CompileUnit: id = {0x00000000}, file = "/home/mikesart/data/src/blah/blah.cpp", language = "ISO C++:1998"
>        Function: id = {0x000003c9}, name = "main", range = [0x0000000000409970-0x000000000040a275)
>        FuncType: id = {0x000003c9}, decl = blah.cpp:159, clang_type = "int (int, char **)"
>          Blocks: id = {0x000003c9}, range = [0x00409970-0x0040a275)
>       LineEntry: [0x0000000000409970-0x0000000000409991): /home/mikesart/data/src/blah/blah.cpp:160
>          Symbol: id = {0x00000076}, range = [0x0000000000409970-0x000000000040a275), name="main"
>        Variable: id = {0x000003e6}, name = "argc", type= "int", location = DW_OP_fbreg(-8), decl = blah.cpp:159
>        Variable: id = {0x000003f4}, name = "argv", type= "char **", location = DW_OP_fbreg(-16), decl = blah.cpp:159
>        Variable: id = {0x00000402}, name = "msg", type= "Person", location = DW_OP_fbreg(-248), decl = blah.cpp:297
> 
> As does using the address for "main".
> 
> (lldb) p main
> (int (*)(int, char **)) $4 = 0x0000000000409970 (blah`main at blah.cpp:160)
> (lldb) target modules lookup -Av -a 0x0000000000409970
>       Address: blah[0x0000000000409970] (blah..text + 368)
>       Summary: blah`main at blah.cpp:160
>        Module: file = "/home/mikesart/data/src/blah/build/blah", arch = "x86_64"
>   CompileUnit: id = {0x00000000}, file = "/home/mikesart/data/src/blah/blah.cpp", language = "ISO C++:1998"
>      Function: id = {0x000003c9}, name = "main", range = [0x0000000000409970-0x000000000040a275)
>      FuncType: id = {0x000003c9}, decl = blah.cpp:159, clang_type = "int (int, char **)"
>        Blocks: id = {0x000003c9}, range = [0x00409970-0x0040a275)
>     LineEntry: [0x0000000000409970-0x0000000000409991): /home/mikesart/data/src/blah/blah.cpp:160
>        Symbol: id = {0x00000076}, range = [0x0000000000409970-0x000000000040a275), name="main"
>      Variable: id = {0x000003e6}, name = "argc", type= "int", location = DW_OP_fbreg(-8), decl = blah.cpp:159
>      Variable: id = {0x000003f4}, name = "argv", type= "char **", location = DW_OP_fbreg(-16), decl = blah.cpp:159
>      Variable: id = {0x00000402}, name = "msg", type= "Person", location = DW_OP_fbreg(-248), decl = blah.cpp:297
> 
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