[lldb-dev] [Bug 15415] New: Backtrace fails when frame pointers are omitted

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15415

            Bug ID: 15415
           Summary: Backtrace fails when frame pointers are omitted
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at cs.uiuc.edu
          Reporter: samueldotj at gmail.com
    Classification: Unclassified

Created attachment 10124
  --> http://llvm.org/bugs/attachment.cgi?id=10124&action=edit
Test C Program Source

Backtrace is incomplete when -fomit-frame-pointer is used.
Please see the test source file attached when it is compiled with the following
comamnd "gcc -g -fomit-frame-pointer ~/test.c", lldb is not able to unwind the
stack completely. The CFI seems to be correct and gdb is able to unwind the
stack fully,

$lldb a.out
Current executable set to 'a.out' (x86_64).
(lldb) run
Process 13804 launched: '/dbc/pa-dbc1027/jacobs/pycdb/pycdb/test/a.out'
(x86_64)
Process 13804 stopped
* thread #1: tid = 0x35ec, 0x00000000004004e1 a.out`recursive_function(i=10) +
45 at test.c:10, stop reason = invalid address
    frame #0: 0x00000000004004e1 a.out`recursive_function(i=10) + 45 at
test.c:10
   7        else
   8        {
   9            char *null=0;
-> 10           *null = 0;
   11       }
   12   }
   13
bt
* thread #1: tid = 0x35ec, 0x00000000004004e1 a.out`recursive_function(i=10) +
45 at test.c:10, stop reason = invalid address
    frame #0: 0x00000000004004e1 a.out`recursive_function(i=10) + 45 at
test.c:10
    frame #1: 0x00000000004004d1 a.out`recursive_function(i=9) + 29 at test.c:5

---------------------------------------------------------------

When it is compiled without -fomit-frame-pointer option it works fine in lldb.

$lldb a.out
Current executable set to 'a.out' (x86_64).

(lldb) run
Process 13754 launched: '/dbc/pa-dbc1027/jacobs/pycdb/pycdb/test/a.out'
(x86_64)
Process 13754 stopped
* thread #1: tid = 0x35ba, 0x00000000004004e0 a.out`recursive_function(i=10) +
44 at test.c:10, stop reason = invalid address
    frame #0: 0x00000000004004e0 a.out`recursive_function(i=10) + 44 at
test.c:10
   7        else
   8        {
   9            char *null=0;
-> 10           *null = 0;
   11       }
   12   }
   13
bt
* thread #1: tid = 0x35ba, 0x00000000004004e0 a.out`recursive_function(i=10) +
44 at test.c:10, stop reason = invalid address
    frame #0: 0x00000000004004e0 a.out`recursive_function(i=10) + 44 at
test.c:10
    frame #1: 0x00000000004004d2 a.out`recursive_function(i=9) + 30 at test.c:5
    frame #2: 0x00000000004004d2 a.out`recursive_function(i=8) + 30 at test.c:5
    frame #3: 0x00000000004004d2 a.out`recursive_function(i=7) + 30 at test.c:5
    frame #4: 0x00000000004004d2 a.out`recursive_function(i=6) + 30 at test.c:5
    frame #5: 0x00000000004004d2 a.out`recursive_function(i=5) + 30 at test.c:5
    frame #6: 0x00000000004004d2 a.out`recursive_function(i=4) + 30 at test.c:5
    frame #7: 0x00000000004004d2 a.out`recursive_function(i=3) + 30 at test.c:5
    frame #8: 0x00000000004004d2 a.out`recursive_function(i=2) + 30 at test.c:5
    frame #9: 0x00000000004004d2 a.out`recursive_function(i=1) + 30 at test.c:5
    frame #10: 0x00000000004004d2 a.out`recursive_function(i=0) + 30 at
test.c:5
    frame #11: 0x00000000004004fe a.out`main(argc=1, argv=0x00007fffe559c4c8) +
25 at test.c:16
    frame #12: 0x00007f3f8848176d libc.so.6`__libc_start_main + 237
    frame #13: 0x00000000004003f9 a.out`_start + 41

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