Introduce gdb_interact in testsuite

gdb_interact is a small utility that we have found quite useful to debug
test cases.

Putting gdb_interact in a test suspends it and allows to interact with
gdb to inspect whatever you want. You can then type ">>>" to resume the
test execution. Of course, this is only for gdb devs. It wouldn't make
sense to leave a gdb_interact permanently in a test case.

When starting the interaction with the user, the script prints this
banner:

+------------------------------------------+
| Script interrupted, you can now interact |
| with by gdb. Type >>> to continue.       |
+------------------------------------------+

Notes:
* When gdb is launched, the gdb_spawn_id variable (lib/gdb.exp) is
  assigned -1. Given the name, I would expect it to contain the gdb
  expect spawn id, which is needed for interact. I changed all places
  that set gdb_spawn_id to -1 to set it to the actual gdb spawn id
  instead.

* When entering the "interact" mode, the last (gdb) prompt is already
  eaten by expect, so it doesn't show up on the terminal. Subsequent
  prompts do appear though. We tried to print "(gdb)" just before the
  interact to replace it. However, it could be misleading if you are
  debugging an MI test case, it makes you think that you are typing in a
  CLI prompt, when in reality it's MI. In the end I decided that since
  the feature is for developers who know what they're doing and that one
  is normally consciously using gdb_interact, the script doesn't need
  to babysit the user.

* There are probably some quirks depending on where in the script
  gdb_interact appears (e.g. it could interfere with following
  commands and make them fail), but it works for most cases. Quirks can
  always be fixed later.

The idea and original implementation was contributed by Anders
Granlund, a colleague of mine. Thanks to him.

gdb/testsuite/ChangeLog:

	* gdb.base/statistics.exp: Assign spawn id to gdb_spawn_id.
	* gdb.base/valgrind-db-attach.exp: Same.
	* gdb.base/valgrind-infcall.exp: Same.
	* lib/mi-support.exp (default_mi_gdb_start): Same.
	* lib/prompt.exp (default_prompt_gdb_start): Same.
	* lib/gdb.exp (default_gdb_spawn): Same.
	(gdb_interact): New.

3 files changed, 22 insertions, 3 deletions

diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index d3a3350..a6f200f 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -1444,7 +1444,8 @@ proc default_gdb_spawn { } {
 	perror "Spawning $GDB failed."
 	return 1
     }
-    set gdb_spawn_id -1
+
+    set gdb_spawn_id $res
     return 0
 }
 
@@ -1516,6 +1517,24 @@ proc default_gdb_start { } {
     return 0
 }
 
+# Utility procedure to give user control of the gdb prompt in a script. It is
+# meant to be used for debugging test cases, and should not be left in the
+# test cases code.
+
+proc gdb_interact { } {
+    global gdb_spawn_id
+    set spawn_id $gdb_spawn_id
+
+    send_user "+------------------------------------------+\n"
+    send_user "| Script interrupted, you can now interact |\n"
+    send_user "| with by gdb. Type >>> to continue.       |\n"
+    send_user "+------------------------------------------+\n"
+
+    interact {
+	">>>" return
+    }
+}
+
 # Examine the output of compilation to determine whether compilation
 # failed or not.  If it failed determine whether it is due to missing
 # compiler or due to compiler error.  Report pass, fail or unsupported
diff --git a/gdb/testsuite/lib/mi-support.exp b/gdb/testsuite/lib/mi-support.exp
index f1b9c2b..20546f6 100644
--- a/gdb/testsuite/lib/mi-support.exp
+++ b/gdb/testsuite/lib/mi-support.exp
@@ -191,7 +191,7 @@ proc default_mi_gdb_start { args } {
 	    return -1
 	}
     }
-    set gdb_spawn_id -1
+    set gdb_spawn_id $res
 
     # FIXME: mi output does not go through pagers, so these can be removed.
     # force the height to "unlimited", so no pagers get used
diff --git a/gdb/testsuite/lib/prompt.exp b/gdb/testsuite/lib/prompt.exp
index 1982524..a9696a4 100644
--- a/gdb/testsuite/lib/prompt.exp
+++ b/gdb/testsuite/lib/prompt.exp
@@ -78,7 +78,7 @@ proc default_prompt_gdb_start { } {
 	    return -1
 	}
     }
-    set gdb_spawn_id -1
+    set gdb_spawn_id $res
     return 0
 }