[PATCH 02/15] gdb/testsuite: update gdb.tui/tui-disasm-long-lines.exp

[Andrew Burgess <aburgess@redhat.com>]

Following on from the previous commit, in this commit I am updating
the test script gdb.tui/tui-disasm-long-lines.exp to take account of
the changes in commit:

  commit 9162a27c5f5828240b53379d735679e2a69a9f41
  Date:   Tue Nov 13 11:59:03 2018 -0700

      Change gdb test suite's TERM setting

In the above commit the TERM environment variable was changed to be
'dumb' by default, which means that tests, that previously activated
tui mode, no longer do unless TERM is set to 'ansi'.

As the gdb.tui/tui-disasm-long-lines.exp script didn't do this, the
test stopped working.  As the expect patterns in this script were
pretty generic no tests actually started failing, and we never
noticed.

In this commit I update the script to use Term::clean_restart, which
correctly sets TERM to 'ansi'.  I've also added a check that the asm
box does appear on the screen, which should indicate that tui mode has
correctly activated.

However, I also notice that GDB doesn't appear to fully work
correctly.  The test should display the disassembly for the test
program, but it doesn't.

The test is trying to disassemble some code that (deliberately) uses a
very long symbol name, this eventually results in GDB entering
tui_source_window_base::show_source_content and trying to allocate an
ncurses pad in order to hold the current page of disassembler output.

Unfortunately, due to the very long line, the call to newpad fails,
meaning that tui_source_window_base::m_pad is nullptr.  Luckily non of
the following calls appear to crash when passed a nullptr, however,
all the output that is written to the pad is lost, which is why we
don't see any assembly code written to the screen.

As the test history indicates that the script was originally checking
for a crash in GDB when the long identifier was encountered, I think
there is value in just leaving the test as it is for now, I'll see if
I can come up with a solution to the long line problem in a later
commit.
---
 .../gdb.tui/tui-disasm-long-lines.exp         | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/gdb/testsuite/gdb.tui/tui-disasm-long-lines.exp b/gdb/testsuite/gdb.tui/tui-disasm-long-lines.exp
index 0ad91308ca4..acc4c54063f 100644
--- a/gdb/testsuite/gdb.tui/tui-disasm-long-lines.exp
+++ b/gdb/testsuite/gdb.tui/tui-disasm-long-lines.exp
@@ -16,6 +16,8 @@
 # Test that the logic for displaying the TUI disassembly window
 # handles very long lines.
 
+tuiterm_env
+
 standard_testfile
 
 set ccopts {debug quiet}
@@ -31,13 +33,16 @@ if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "$binfile" \
     }
 }
 
-clean_restart "$binfile"
-
-if {[skip_tui_tests]} {
-    # TUI support is disabled.  Check for error message.
-    gdb_test "layout asm" "Undefined command: \"layout\".  Try \"help\"."
+Term::clean_restart 24 80 $binfile
+if {![Term::prepare_for_tui]} {
+    unsupported "TUI not supported"
     return
 }
 
-# Just check the command does not cause gdb to crash.
-gdb_test "layout asm"
+# Just check the command does not cause gdb to crash.  It is worth
+# noting that the asm window does infact fail to correctly display the
+# disassembler output at this point, but initially we are just
+# checking that GDB doesn't crash, fixing the asm display will come
+# later.
+Term::command_no_prompt_prefix "layout asm"
+Term::check_box "asm box" 0 0 80 15
-- 
2.25.4