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[PATCH 00/15] record-btrace: goto support


This is the start of the next step for branch tracing support.

This series adds support for the "record goto" command for the btrace record
target.  It allows navigating to a place in the recorded execution log and
printing the back trace at this point.

There are a number of opens wrt unwinding listed in the last patch of the
series, which makes this more an RFC than a real PATCH series, I suppose.

It also changes the existing "record function-call-history" and "record
instruction-history" commands slightly and fixes PR/15240.  The "record
function-call-history" command can now show the call relationship like this:

(gdb) record function-call-history /cli
12          fib inst 101,111    at src/fib.c:3,7
13            fib       inst 112,124    at src/fib.c:3,8
14          fib inst 125,129    at src/fib.c:7
15            fib       inst 130,142    at src/fib.c:3,8
16          fib inst 143,147    at src/fib.c:7,8
17        fib   inst 148,152    at src/fib.c:7,8
18      fib     inst 153,157    at src/fib.c:7
19        fib   inst 158,168    at src/fib.c:3,7
20          fib inst 169,179    at src/fib.c:3,7
21            fib       inst 180,185    at src/fib.c:3,4


The instruction numbers printed with the /i modifier can be used for figuring
out interesting locations to go to.  It looks like this:

(gdb) record goto 130
#0  0x0000000000400558 in fib (
    n=<error reading variable: can't compute CFA for this frame>)
    at src/fib.c:3
3       static unsigned long fib(unsigned long n) {
(gdb) list
1       #include <stdio.h>
2
3       static unsigned long fib(unsigned long n) {
4           if (n < 2)
5               return n;
6
7           return fib(n-1) + fib(n-2);
8       }
9
10      extern int main(int argc, char **argv) {
(gdb) backtrace
#0  0x0000000000400558 in fib (
    n=<error reading variable: can't compute CFA for this frame>)
    at src/fib.c:3
#1  0x000000000040058c in fib (
    n=<error reading variable: can't compute CFA for this frame>)
    at src/fib.c:7
#2  0x0000000000400591 in fib (
    n=<error reading variable: can't compute CFA for this frame>)
    at src/fib.c:7
#3  0x0000000000400591 in fib (
    n=<error reading variable: can't compute CFA for this frame>)
    at src/fib.c:7
#4  0x0000000000400591 in fib (
    n=<error reading variable: can't compute CFA for this frame>)
    at src/fib.c:7
#5  main (argc=<unavailable>, argv=<unavailable>) at src/fib.c:19
Backtrace stopped: not enough registers or memory available to unwind further


Markus Metzger (15):
  gdbarch: add instruction predicate methods
  btrace: change branch trace data structure
  record-btrace: fix insn range in function call history
  btrace: increase buffer size
  record-btrace: optionally indent function call history
  record-btrace: make ranges include begin and end
  btrace: add replay position to btrace thread info
  target: add ops parameter to to_prepare_to_store method
  record-btrace: supply register target methods
  frame, backtrace: allow targets to supply a frame unwinder
  record-btrace, frame: supply target-specific unwinder
  record-btrace: provide xfer_partial target method
  record-btrace: add to_wait and to_resume target methods.
  record-btrace: add record goto target methods
  record-btrace: extend unwinder

 gdb/NEWS                                           |   10 +
 gdb/amd64-tdep.c                                   |   66 ++
 gdb/btrace.c                                       |  979 +++++++++++++++----
 gdb/btrace.h                                       |  173 +++-
 gdb/common/linux-btrace.c                          |   25 +-
 gdb/doc/gdb.texinfo                                |   18 +-
 gdb/dwarf2-frame.c                                 |    8 +-
 gdb/frame-unwind.c                                 |   80 +-
 gdb/frame.c                                        |    9 +-
 gdb/frame.h                                        |    4 +-
 gdb/gdbarch.c                                      |   99 ++
 gdb/gdbarch.h                                      |   24 +
 gdb/gdbarch.sh                                     |    9 +
 gdb/i386-tdep.c                                    |   57 +
 gdb/inf-child.c                                    |    2 +-
 gdb/monitor.c                                      |    2 +-
 gdb/ravenscar-thread.c                             |    7 +-
 gdb/record-btrace.c                                | 1070 +++++++++++++++++---
 gdb/record-full.c                                  |    3 +-
 gdb/record.c                                       |    4 +
 gdb/record.h                                       |    3 +
 gdb/remote-m32r-sdi.c                              |    2 +-
 gdb/remote-mips.c                                  |    5 +-
 gdb/remote.c                                       |    5 +-
 gdb/target.c                                       |   42 +-
 gdb/target.h                                       |   12 +-
 gdb/testsuite/gdb.btrace/Makefile.in               |    3 +-
 gdb/testsuite/gdb.btrace/exception.cc              |   56 +
 gdb/testsuite/gdb.btrace/exception.exp             |   64 ++
 gdb/testsuite/gdb.btrace/function_call_history.exp |  142 ++-
 gdb/testsuite/gdb.btrace/instruction_history.exp   |    6 +-
 gdb/testsuite/gdb.btrace/record_goto.c             |   51 +
 gdb/testsuite/gdb.btrace/record_goto.exp           |  166 +++
 gdb/testsuite/gdb.btrace/tailcall.exp              |   66 ++
 gdb/testsuite/gdb.btrace/unknown_functions.c       |   45 +
 gdb/testsuite/gdb.btrace/unknown_functions.exp     |   58 ++
 gdb/testsuite/gdb.btrace/x86-record_goto.S         |  332 ++++++
 gdb/testsuite/gdb.btrace/x86-tailcall.S            |  269 +++++
 gdb/testsuite/gdb.btrace/x86-tailcall.c            |   39 +
 39 files changed, 3524 insertions(+), 491 deletions(-)
 create mode 100644 gdb/testsuite/gdb.btrace/exception.cc
 create mode 100644 gdb/testsuite/gdb.btrace/exception.exp
 create mode 100644 gdb/testsuite/gdb.btrace/record_goto.c
 create mode 100644 gdb/testsuite/gdb.btrace/record_goto.exp
 create mode 100644 gdb/testsuite/gdb.btrace/tailcall.exp
 create mode 100644 gdb/testsuite/gdb.btrace/unknown_functions.c
 create mode 100644 gdb/testsuite/gdb.btrace/unknown_functions.exp
 create mode 100644 gdb/testsuite/gdb.btrace/x86-record_goto.S
 create mode 100644 gdb/testsuite/gdb.btrace/x86-tailcall.S
 create mode 100644 gdb/testsuite/gdb.btrace/x86-tailcall.c


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