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Greg Clayton 4763200ec9 Add the ability to show when variables fails to be available when debug info is valid. 
Summary:
Many times when debugging variables might not be available even though a user can successfully set breakpoints and stops somewhere. Letting the user know will help users fix these kinds of issues and have a better debugging experience.

Examples of this include:
- enabling -gline-tables-only and being able to set file and line breakpoints and yet see no variables
- unable to open object file for DWARF in .o file debugging for darwin targets due to modification time mismatch or not being able to locate the N_OSO file.

This patch adds an new API to SBValueList:

  lldb::SBError lldb::SBValueList::GetError();

object so that if you request a stack frame's variables using SBValueList SBFrame::GetVariables(...), you can get an error the describes why the variables were not available.

This patch adds the ability to get an error back when requesting variables from a lldb_private::StackFrame when calling GetVariableList.

It also now shows an error in response to "frame variable" if we have debug info and are unable to get varialbes due to an error as mentioned above:

(lldb) frame variable
error: "a.o" object from the "/tmp/libfoo.a" archive: either the .o file doesn't exist in the archive or the modification time (0x63111541) of the .o file doesn't match

Reviewers: labath JDevlieghere aadsm yinghuitan jdoerfert sscalpone

Subscribers:

Differential Revision: https://reviews.llvm.org/D133164
 		2022-09-12 13:59:05 -07:00
..
Makefile Add the ability to show when variables fails to be available when debug info is valid. 2022-09-12 13:59:05 -07:00
README
…
TestBSDArchives.py Add the ability to show when variables fails to be available when debug info is valid. 2022-09-12 13:59:05 -07:00
a.c
…
b.c
…
c.c [lldb] Add support to load object files from thin archives 2022-07-05 10:52:26 +02:00
main.c
…

README 

a.out file refers to libfoo.a for a.o and b.o, which is what we want to accomplish for
this test case.

[16:17:44] johnny:/Volumes/data/lldb/svn/latest/test/functionalities/archives $ dsymutil -s a.out 
----------------------------------------------------------------------
Symbol table for: 'a.out' (x86_64)
----------------------------------------------------------------------
Index    n_strx   n_type             n_sect n_desc n_value
======== -------- ------------------ ------ ------ ----------------
[     0] 00000002 64 (N_SO         ) 00     0000   0000000000000000 '/Volumes/data/lldb/svn/latest/test/functionalities/archives/'
[     1] 0000003f 64 (N_SO         ) 00     0000   0000000000000000 'main.c'
[     2] 00000046 66 (N_OSO        ) 03     0001   000000004f0f780c '/Volumes/data/lldb/svn/latest/test/functionalities/archives/main.o'
[     3] 00000001 2e (N_BNSYM      ) 01     0000   0000000100000d70
[     4] 00000089 24 (N_FUN        ) 01     0000   0000000100000d70 '_main'
[     5] 00000001 24 (N_FUN        ) 00     0000   000000000000005d
[     6] 00000001 4e (N_ENSYM      ) 01     0000   000000000000005d
[     7] 00000001 64 (N_SO         ) 01     0000   0000000000000000
[     8] 00000002 64 (N_SO         ) 00     0000   0000000000000000 '/Volumes/data/lldb/svn/latest/test/functionalities/archives/'
[     9] 0000008f 64 (N_SO         ) 00     0000   0000000000000000 'a.c'
[    10] 00000093 66 (N_OSO        ) 03     0001   000000004f0f780c '/Volumes/data/lldb/svn/latest/test/functionalities/archives/libfoo.a(a.o)'
[    11] 00000001 2e (N_BNSYM      ) 01     0000   0000000100000dd0
[    12] 000000dd 24 (N_FUN        ) 01     0000   0000000100000dd0 '_a'
[    13] 00000001 24 (N_FUN        ) 00     0000   0000000000000020
[    14] 00000001 4e (N_ENSYM      ) 01     0000   0000000000000020
[    15] 00000001 2e (N_BNSYM      ) 01     0000   0000000100000df0
[    16] 000000e0 24 (N_FUN        ) 01     0000   0000000100000df0 '_aa'
[    17] 00000001 24 (N_FUN        ) 00     0000   0000000000000018
[    18] 00000001 4e (N_ENSYM      ) 01     0000   0000000000000018
[    19] 000000e4 20 (N_GSYM       ) 00     0000   0000000000000000 '___a_global'
[    20] 00000001 64 (N_SO         ) 01     0000   0000000000000000
[    21] 00000002 64 (N_SO         ) 00     0000   0000000000000000 '/Volumes/data/lldb/svn/latest/test/functionalities/archives/'
[    22] 000000f0 64 (N_SO         ) 00     0000   0000000000000000 'b.c'
[    23] 000000f4 66 (N_OSO        ) 03     0001   000000004f0f780c '/Volumes/data/lldb/svn/latest/test/functionalities/archives/libfoo.a(b.o)'
[    24] 00000001 2e (N_BNSYM      ) 01     0000   0000000100000e10
[    25] 0000013e 24 (N_FUN        ) 01     0000   0000000100000e10 '_b'
[    26] 00000001 24 (N_FUN        ) 00     0000   0000000000000020
[    27] 00000001 4e (N_ENSYM      ) 01     0000   0000000000000020
[    28] 00000001 2e (N_BNSYM      ) 01     0000   0000000100000e30
[    29] 00000141 24 (N_FUN        ) 01     0000   0000000100000e30 '_bb'
[    30] 00000001 24 (N_FUN        ) 00     0000   0000000000000018
[    31] 00000001 4e (N_ENSYM      ) 01     0000   0000000000000018
[    32] 00000145 26 (N_STSYM      ) 0a     0000   000000010000104c '___b_global'
[    33] 00000001 64 (N_SO         ) 01     0000   0000000000000000
[    34] 00000151 0e (     SECT    ) 07     0000   0000000100001000 '_pvars'
[    35] 00000158 0e (     SECT    ) 0a     0000   000000010000104c '___b_global'
[    36] 00000164 0f (     SECT EXT) 0b     0000   0000000100001050 '_NXArgc'
[    37] 0000016c 0f (     SECT EXT) 0b     0000   0000000100001058 '_NXArgv'
[    38] 00000174 0f (     SECT EXT) 0a     0000   0000000100001048 '___a_global'
[    39] 00000180 0f (     SECT EXT) 0b     0000   0000000100001068 '___progname'
[    40] 0000018c 03 (     ABS  EXT) 01     0010   0000000100000000 '__mh_execute_header'
[    41] 000001a0 0f (     SECT EXT) 01     0000   0000000100000dd0 '_a'
[    42] 000001a3 0f (     SECT EXT) 01     0000   0000000100000df0 '_aa'
[    43] 000001a7 0f (     SECT EXT) 01     0000   0000000100000e10 '_b'
[    44] 000001aa 0f (     SECT EXT) 01     0000   0000000100000e30 '_bb'
[    45] 000001ae 0f (     SECT EXT) 0b     0000   0000000100001060 '_environ'
[    46] 000001b7 0f (     SECT EXT) 01     0000   0000000100000d70 '_main'
[    47] 000001bd 0f (     SECT EXT) 01     0000   0000000100000d30 'start'
[    48] 000001c3 01 (     UNDF EXT) 00     0100   0000000000000000 '_exit'
[    49] 000001c9 01 (     UNDF EXT) 00     0100   0000000000000000 '_printf'
[    50] 000001d1 01 (     UNDF EXT) 00     0100   0000000000000000 'dyld_stub_binder'