Extend test gdb.python/py-recurse-unwind.exp
Commit Message
This patch modifies the unwinder (sniffer) defined in
py-recurse-unwind.py so that, depending upon the value of one of its
class variables, it will take different paths through the code,
testing different functionality.
The original test attempted to obtain the value of an undefined
symbol.
This somewhat expanded test checks to see if 'pc' can be read via
gdb.PendingFrame.read_register() and also via gdb.parse_and_eval().
gdb/testsuite/ChangeLog:
* gdb.python/py-recurse-unwind.c (ccc): Delete.
(ccc0, ccc1, ccc2): New functions.
(bbb): Call ccc0, ccc1, and ccc2.
* gdb.python/py-recurse-unwind.py (TestUnwinder): Add calls
to read_register() and gdb.parse_and_eval(). Make each code
call a separate case that can be individually tested.
* gdb.python/py-recurse-unwind.exp (cont_and_backtrace): New
proc. Call cont_and_backtrace for each of the code paths that
we want to test in the unwinder.
---
gdb/testsuite/gdb.python/py-recurse-unwind.c | 16 ++++++-
gdb/testsuite/gdb.python/py-recurse-unwind.exp | 61 ++++++++++++++++----------
gdb/testsuite/gdb.python/py-recurse-unwind.py | 29 +++++++++---
3 files changed, 76 insertions(+), 30 deletions(-)
@@ -18,14 +18,26 @@
/* This is the test program loaded into GDB by the py-recurse-unwind test. */
void
-ccc (int arg)
+ccc0 (int arg)
+{
+}
+
+void
+ccc1 (int arg)
+{
+}
+
+void
+ccc2 (int arg)
{
}
void
bbb (int arg)
{
- ccc (789);
+ ccc0 (789);
+ ccc1 (789);
+ ccc2 (789);
}
void
@@ -45,29 +45,44 @@ if ![runto_main] then {
return 0
}
-gdb_breakpoint "ccc"
-gdb_continue_to_breakpoint "ccc"
-
-# If the unwinder is active, the usage count will increment while
-# running to the breakpoint. Reset it prior to doing the backtrace.
-gdb_test_no_output "python TestUnwinder.reset_count()"
-
-# The python based unwinder should be called a number of times while
-# generating the backtrace, but its sniffer always returns None. So
-# it doesn't really contribute to generating any of the frames below.
-#
-# But that's okay. Our goal here is to make sure that GDB doesn't
-# get hung up in potentially infinite recursion when invoking the
-# Python-based unwinder.
-
-gdb_test_sequence "bt" "backtrace" {
- "\\r\\n#0 .* ccc \\(arg=789\\) at "
- "\\r\\n#1 .* bbb \\(arg=456\\) at "
- "\\r\\n#2 .* aaa \\(arg=123\\) at "
- "\\r\\n#3 .* main \\(.*\\) at"
+proc cont_and_backtrace { tst func } {
+
+ gdb_breakpoint "$func"
+
+ # We're testing different code paths within the unwinder's sniffer.
+ # Set the current patch to be tested here.
+ gdb_test_no_output "python TestUnwinder.set_test(\"$tst\")" \
+ "set code path within python unwinder to $tst"
+
+ # If the unwinder is active, the usage count will increment while
+ # running to the breakpoint. Reset it prior to doing the backtrace.
+ gdb_test_no_output "python TestUnwinder.reset_count()" \
+ "reset count for $tst"
+
+ gdb_continue_to_breakpoint "$func"
+
+ # The python based unwinder should be called a number of times while
+ # generating the backtrace, but its sniffer always returns None. So
+ # it doesn't really contribute to generating any of the frames below.
+ #
+ # But that's okay. Our goal here is to make sure that GDB doesn't
+ # get hung up in potentially infinite recursion when invoking the
+ # Python-based unwinder.
+
+ gdb_test_sequence "bt" "backtrace for $tst" {
+ "\\r\\n#0 .* ccc. \\(arg=789\\) at "
+ "\\r\\n#1 .* bbb \\(arg=456\\) at "
+ "\\r\\n#2 .* aaa \\(arg=123\\) at "
+ "\\r\\n#3 .* main \\(.*\\) at"
+ }
+
+ # Test that the python-based unwinder / sniffer was actually called
+ # during generation of the backtrace.
+ gdb_test "python print(TestUnwinder.count > 0)" "True" \
+ "python unwinder called for $tst"
}
-# Test that the python-based unwinder / sniffer was actually called
-# during generation of the backtrace.
-gdb_test "python print(TestUnwinder.count > 0)" "True"
+cont_and_backtrace "check_undefined_symbol" "ccc0"
+cont_and_backtrace "check_user_reg_pc" "ccc1"
+cont_and_backtrace "check_pae_pc" "ccc2"
@@ -40,13 +40,18 @@ class TestUnwinder(Unwinder):
def inc_count (cls):
cls.count += 1
+ test = 'check_undefined_symbol'
+
+ @classmethod
+ def set_test (cls, test) :
+ cls.test = test
+
def __init__(self):
Unwinder.__init__(self, "test unwinder")
self.recurse_level = 0
def __call__(self, pending_frame):
-
if self.recurse_level > 0:
gdb.write("TestUnwinder: Recursion detected - returning early.\n")
return None
@@ -54,11 +59,25 @@ class TestUnwinder(Unwinder):
self.recurse_level += 1
TestUnwinder.inc_count()
- try:
- val = gdb.parse_and_eval("undefined_symbol")
+ if TestUnwinder.test == 'check_user_reg_pc' :
+
+ pc = pending_frame.read_register('pc')
+ pc_as_int = int(pc.cast(gdb.lookup_type('int')))
+ # gdb.write("In unwinder: pc=%x\n" % pc_as_int)
+
+ elif TestUnwinder.test == 'check_pae_pc' :
+
+ pc = gdb.parse_and_eval('$pc')
+ pc_as_int = int(pc.cast(gdb.lookup_type('int')))
+ # gdb.write("In unwinder: pc=%x\n" % pc_as_int)
+
+ elif TestUnwinder.test == 'check_undefined_symbol' :
+
+ try:
+ val = gdb.parse_and_eval("undefined_symbol")
- except Exception as arg:
- pass
+ except Exception as arg:
+ pass
self.recurse_level -= 1