[RFC]Enable to set breakpoint on line which includes inlined function call

["Terry Guo" <terry dot guo at arm dot com>]

Hi there,

This patch intends to enable setting breakpoint on source line that has
inlined function call as shown in below case:

$ ../install-x86-upstream/bin/gdb a.out
GNU gdb (GDB) 7.8.50.20141117-cvs
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
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This GDB was configured as "x86_64-unknown-linux-gnu".
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Type "apropos word" to search for commands related to "word"...
Reading symbols from a.out...done.
(gdb) !cat -n g.c
     1  volatile int x;
     2
     3  static inline void foo(int f)
     4  {
     5    volatile int y;
     6    y = f;
     7  }
     8
     9  __attribute__( ( always_inline ) ) static inline void bar(int b)
    10  {
    11    volatile int y;
    12    y = b;
    13  }
    14
    15  int main(void) {
    16
    17      x= 42;
    18
    19      if (x)
    20        foo(16);
    21      else
    22        foo(18);
    23
    24      while (1)
    25        {
    26          bar(10);
    27        }
    28
    29      return 0 ;
    30  }
    31
(gdb) b g.c:20
No line 20 in file "g.c".
Make breakpoint pending on future shared library load? (y or [n]) n
(gdb)

Please use recent gcc 5.0 to build the case. Command is "gcc -O2 -g g.c".

The idea is to find functions that are inlined at specified line number and
then set breakpoint at first inlined function instruction, when we couldn't
find an instruction for specified line number. Tested with GDB regression
test on x86_64, no regression. Any comments?

BR,
Terry

Attachment: gdb-bp-inline-v1.txt
Description: Text document