gdb

PR python/11145:
	* python/py-value.c: Include expression.h.
	(valpy_do_cast): New function.
	(valpy_cast): Use it.
	(valpy_dynamic_cast): New function.
	(valpy_reinterpret_cast): Likewise.
	(value_object_methods): Add dynamic_cast, reinterpret_cast.
gdb/doc
	PR python/11145:
	* gdb.texinfo (Values From Inferior): Document dynamic_cast and
	reinterpret_cast methods.
gdb/testsuite
	PR python/11145:
	* gdb.python/py-value.c (Base, Derived): New types.
	(base): New global.
	* gdb.python/py-value.exp (test_subscript_regression): Add
	dynamic_cast test.

gdb/testsuite/gdb.python/py-value.c

@@ -40,6 +40,16 @@ typedef struct s *PTR;
 enum e evalue = TWO;
 
 #ifdef __cplusplus
+
+struct Base {
+  virtual int x() { return 5; }
+};
+
+struct Derived : public Base {
+};
+
+Base *base = new Derived ();
+
 void ptr_ref(int*& rptr_int)
 {
   return; /* break to inspect pointer by reference. */

gdb/testsuite/gdb.python/py-value.exp

@@ -374,6 +374,11 @@ proc test_subscript_regression {lang} {
      gdb_py_test_silent_cmd "python rptr = gdb.history(0)" \
 	 "Obtains value from GDB" 1
      gdb_test "python print rptr\[0\]" "2" "Check pointer passed as reference"
+
+     # Just the most basic test of dynamic_cast -- it is checked in
+     # the C++ tests.
+     gdb_test "python print bool(gdb.parse_and_eval('base').dynamic_cast(gdb.lookup_type('Derived').pointer()))" \
+	 True
  }
 
  gdb_breakpoint [gdb_get_line_number "break to inspect struct and union"]