[lldb-dev] Deprecation of the LLVM SVN server

[Mike Edwards via lldb-dev]

Hi,
This is just a friendly reminder of the upcoming deprecation and shutdown
of the SVN server.  As announced during the last US Developers Conference,
way back in 2019, the SVN server would remain in a read-only state for 1
year.  It has been more than a year now and it is time to let the server
enjoy a well deserved retirement.  We are planning on turning the service
off on January 5th, 2021.  Please plan accordingly if, for some reason, you
are still reliant on the SVN service being available.  Thanks for your time
and attention.  I hope you all are having a nice day and staying safe.

Respectfully,
Mike Edwards
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[lldb-dev] [Bug 48467] New: inconsistent behaviors: the source code lines an address belongs to is inconsistent at source-level debugging and instruction-level debugging

[via lldb-dev]

https://bugs.llvm.org/show_bug.cgi?id=48467

Bug ID: 48467
   Summary: inconsistent behaviors: the source code lines an
address belongs to is inconsistent at source-level
debugging and instruction-level debugging
   Product: lldb
   Version: unspecified
  Hardware: PC
OS: Linux
Status: NEW
  Severity: normal
  Priority: P
 Component: All Bugs
  Assignee: lldb-dev@lists.llvm.org
  Reporter: yangyib...@nju.edu.cn
CC: jdevliegh...@apple.com, llvm-b...@lists.llvm.org

Created attachment 24259
  --> https://bugs.llvm.org/attachment.cgi?id=24259&action=edit
binary

$ clang -v
Ubuntu clang version
12.0.0-++20201202063839+f0193623297-1~exp1~20201202174527.2077
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64

$ lldb -v
lldb version 12.0.0



$ cat small.c
/* { dg-options "-O2" } */
/* { dg-do run } */

static const long long int TagTypeNumber = 0xll;

long long int x;

void foo(void)
{
  x = TagTypeNumber + 1;// Line 10
}

int main(int argc, char **argv)
{
  if (argc > 0)
foo ();// Line 16

  if ((x & TagTypeNumber) == TagTypeNumber)
  {
unsigned y = (unsigned)x;
__builtin_printf ("v: %u\n", y);
if (y != 1)
  __builtin_abort ();
  }

  return 0;
}


$ clang -O2 -g small.c

$ lldb a.out
(lldb) target create "a.out"
Current executable set to '/root/DeVIL/a.out' (x86_64).
(lldb) b main
Breakpoint 1: where = a.out`main + 11 at small.c:15:12, address =
0x0040056b
(lldb) r
Process 42468 stopped
frame #0: 0x0040056b a.out`main(argc=1, argv=0x7fffe038) at
small.c:15:12
-> 15 if (argc > 0)
(lldb) s
Process 42468 stopped
frame #0: 0x0040056f a.out`main(argc=1, argv=0x7fffe038) at
small.c:16
-> 16   foo ();// Line 16
(lldb) s
frame #0: 0x0040056f a.out`main [inlined] foo at small.c:10:5
-> 10 x = TagTypeNumber + 1;// Line 10
(lldb) 



We can found that when step line by line, 0x0040056f belongs to Line 16
and Line 10.
However, when step instruction by instruction, 0x0040056f only belongs
to Line 16 as follows:



$ lldb a.out
(lldb) target create "a.out"
Current executable set to '/root/DeVIL/a.out' (x86_64).
(lldb) b main
Breakpoint 1: where = a.out`main + 11 at small.c:15:12, address =
0x0040056b
(lldb) r
Process 42608 stopped
frame #0: 0x0040056b a.out`main(argc=1, argv=0x7fffe038) at
small.c:15:12
-> 15 if (argc > 0)
(lldb) si
Process 42608 stopped
frame #0: 0x0040056d a.out`main(argc=1, argv=0x7fffe038) at
small.c:15:7
-> 15 if (argc > 0)
(lldb) si
Process 42608 stopped
frame #0: 0x0040056f a.out`main(argc=1, argv=0x7fffe038) at
small.c:16
-> 16   foo ();// Line 16
(lldb) si
Process 42608 stopped
frame #0: 0x00400573 a.out`main [inlined] foo at small.c:10:5
-> 10 x = TagTypeNumber + 1;// Line 10
(lldb)

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