Re: {commit: gdb/mi] -stack-list-locals and -var-list-children

[Jim Ingham <jingham@apple.com>]

Daniel,

>
> I believe that this is a problem in the patch, not in the testcase.  If
> I step to the same PC in a non-MI GDB, the values are correct, but
> above only the first few are initialized.
>
> If I execute this silly little command sequence:
>
> b do_children_tests
> b 208
> run
> -var-create struct_declarations * struct_declarations
> -var-list-children struct_declarations
> -var-list-children --all-values struct_declarations.long_array
> continue
> -var-list-children --all-values struct_declarations.long_array
> print struct_declarations.long_array
>
>
> I get this output:
> ~"GNU gdb 2004-01-23-cvs\n"
> ~"Copyright 2004 Free Software Foundation, Inc.\n"
> ~"GDB is free software, covered by the GNU General Public License, and  
> you are\n"
> ~"welcome to change it and/or distribute copies of it under certain  
> conditions.\n"
> ~"Type \"show copying\" to see the conditions.\n"
> ~"There is absolutely no warranty for GDB.  Type \"show warranty\" for  
> details.\n"
> ~"This GDB was configured as \"i686-pc-linux-gnu\"..."
> ~"Using host libthread_db library  
> \"/lib/tls/i686/cmov/libthread_db.so.1\".\n"
> ~"\n"
> (gdb)
> &"b do_children_tests\n"
> ^done
> (gdb)
> &"b 208\n"
> ^done
> (gdb)
> &"run\n"
> ^done,reason="breakpoint-hit",bkptno="1",thread- 
> id="0",frame={addr="0x080484d0",func="do_children_tests",args=[],file=" 
> /opt/src/gdb/src/gdb/testsuite/gdb.mi/var-cmd.c",line="190"}
> (gdb)
> ^done,name="struct_declarations",numchild="11",type="struct  
> _struct_decl"
> (gdb)
> ^done,numchild="11",children=[child={name="struct_declarations.integer" 
> ,exp="integer",numchild="0",type="int"},child={name="struct_declaration 
> s.character",exp="character",numchild="0",type="char"},child={name="str 
> uct_declarations.char_ptr",exp="char_ptr",numchild="1",type="char  
> *"},child={name="struct_declarations.long_int",exp="long_int",numchild= 
> "0",type="long  
> int"},child={name="struct_declarations.int_ptr_ptr",exp="int_ptr_ptr",n 
> umchild="1",type="int  
> **"},child={name="struct_declarations.long_array",exp="long_array",numc 
> hild="10",type="long int  
> [10]"},child={name="struct_declarations.func_ptr",exp="func_ptr",numchi 
> ld="0",type="void  
> (*)(void)"},child={name="struct_declarations.func_ptr_struct",exp="func 
> _ptr_struct",numchild="0",type="struct _struct_decl (*)(int, char *,  
> long  
> int)"},child={name="struct_declarations.func_ptr_ptr",exp="func_ptr_ptr 
> ",numchild="0",type="struct _struct_decl *(*)(int, char *, long  
> int)"},child={name="struct_declarations.u1",exp="u1",numchild="4",type= 
> "union  
> {...}"},child={name="struct_declarations.s2",exp="s2",numchild="4",type 
> ="struct {...}"}]
> (gdb)
> ^done,numchild="10",children=[child={name="struct_declarations.long_arr 
> ay.0",exp="0",numchild="0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.1",exp="1",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.2",exp="2",numchild=" 
> 0",value="1986358784",type="long  
> int"},child={name="struct_declarations.long_array.3",exp="3",numchild=" 
> 0",value="28281",type="long  
> int"},child={name="struct_declarations.long_array.4",exp="4",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.5",exp="5",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.6",exp="6",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.7",exp="7",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.8",exp="8",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.9",exp="9",numchild=" 
> 0",value="0",type="long int"}]
> (gdb)
> &"continue\n"
> ^done,reason="breakpoint-hit",bkptno="2",thread- 
> id="0",frame={addr="0x08048573",func="do_children_tests",args=[],file=" 
> /opt/src/gdb/src/gdb/testsuite/gdb.mi/var-cmd.c",line="208"}
> (gdb)
> ^done,numchild="10",children=[child={name="struct_declarations.long_arr 
> ay.0",exp="0",numchild="0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.1",exp="1",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.2",exp="2",numchild=" 
> 0",value="1986358784",type="long  
> int"},child={name="struct_declarations.long_array.3",exp="3",numchild=" 
> 0",value="28281",type="long  
> int"},child={name="struct_declarations.long_array.4",exp="4",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.5",exp="5",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.6",exp="6",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.7",exp="7",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.8",exp="8",numchild=" 
> 0",value="0",type="long  
> int"},child={name="struct_declarations.long_array.9",exp="9",numchild=" 
> 0",value="0",type="long int"}]
> (gdb)
> &"print struct_declarations.long_array\n"
> ~"$1 = {"
> ~"1234, "
> ~"2345, "
> ~"3456, "
> ~"4567, "
> ~"5678, "
> ~"6789, "
> ~"7890, "
> ~"8901, "
> ~"9012, "
> ~"1234}\n"
> ^done
> (gdb)
>
>
> Note that the varobj is out of date.
>
>


This is intended behavior.  After continuing the target, you need to  
explicitly call -var-update then -var-evaluate-expression (or  
var-list-children) before you get new values.  That way, if you want to  
you can use varobj's to store historic values - like the $ variables in  
gdb - or use them to represent the variables, depending on whether you  
update them or not.  This is the way it is described in the manual.

Jim
--
Jim Ingham                                   jingham@apple.com
Developer Tools
Apple Computer