Extend test gdb.python/py-recurse-unwind.exp

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 (main): Add loop.
	* 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.

1 files changed, 24 insertions, 5 deletions

diff --git a/gdb/testsuite/gdb.python/py-recurse-unwind.py b/gdb/testsuite/gdb.python/py-recurse-unwind.py
index 1da7aca9339..5eb87bb0b35 100644
--- a/gdb/testsuite/gdb.python/py-recurse-unwind.py
+++ b/gdb/testsuite/gdb.python/py-recurse-unwind.py
@@ -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