[gdb/testsuite] Fix another fail and tcl error in gdb.dap/sources.exp

With gdb.dap/sources.exp on aarch64-linux, I'm running into:
...
{"request_seq": 3, "type": "response", "command": "loadedSources", \
  "success": false, "message": "notStopped", "seq": 7}Content-Length: 92^M
^M
{"type": "event", "event": "thread", \
  "body": {"reason": "started", "threadId": 1}, \
  "seq": 8}FAIL: gdb.dap/sources.exp: loadedSources success
ERROR: tcl error sourcing gdb.dap/sources.exp.
ERROR: tcl error code TCL LOOKUP DICT body
ERROR: key "body" not known in dictionary
    while executing
"dict get [lindex $obj 0] body sources"
...

These are the same type of tcl error and FAIL I just fixed for a later
request in the same test-case.

Fix this by:
- moving the wait-for-stop to before the loadedSources request to fix the
  FAIL, and
- checking for $obj == "" to fix the tcl error.

Also make the code a bit less indented and more readable by wrapping the tests
in a proc, allowing the use of return to bail out, while still running
dap_shutdown afterwards.

Approved-By: Tom Tromey <tom@tromey.com>
Tested on aarch64-linux.

diff --git a/gdb/testsuite/gdb.dap/sources.exp b/gdb/testsuite/gdb.dap/sources.exp
index 9b56337e5a8b1486afa349b1ce753ec8c3ccdaa9..ee853cc68aab636bb22a93ee53afe4b4ca9bfd45 100644 (file)
--- a/gdb/testsuite/gdb.dap/sources.exp
+++ b/gdb/testsuite/gdb.dap/sources.exp
@@ -33,30 +33,37 @@ if {[dap_launch $testfile stop_at_main 1] == ""} {
     return
 }
 
-set obj [dap_check_request_and_response loadedSources loadedSources]
-set path ""
-foreach src [dict get [lindex $obj 0] body sources] {
-    if {[file tail [dict get $src name]] == "sources.c"} {
-       set path [dict get $src path]
-    }  
-}
-
-if {$path == ""} {
-    fail "sources.c in loadedSources"
-} else {
-    pass "sources.c in loadedSources"
-
+proc do_tests {} {
     dap_wait_for_event_and_check "stopped at function breakpoint" stopped \
        "body reason" breakpoint
 
+    set obj [dap_check_request_and_response loadedSources loadedSources]
+    if { $obj == "" } {
+       return
+    }
+
+    set path ""
+    foreach src [dict get [lindex $obj 0] body sources] {
+       if {[file tail [dict get $src name]] == "sources.c"} {
+           set path [dict get $src path]
+       }
+    }
+    gdb_assert {$path != "" } "sources.c in loadedSources"
+    if {$path == ""} {
+       return
+    }
+
     set obj [dap_check_request_and_response "get source" source \
                 [format {o source [o path [s %s]] \
-                           sourceReference [i 0]} $path]]
-    if { $obj != "" } {
-       set text [dict get [lindex $obj 0] body content]
-       gdb_assert {[string first "Distinguishing comment" $text] != -1}
+                             sourceReference [i 0]} $path]]
+    if { $obj == "" } {
+       return
     }
+
+    set text [dict get [lindex $obj 0] body content]
+    gdb_assert {[string first "Distinguishing comment" $text] != -1}
 }
 
+do_tests
 
 dap_shutdown