internal-error using '@' (repeat) operator on array of dynamic objects

[thirdparty/binutils-gdb.git] / gdb / testsuite / gdb.ada / dyn_stride.exp

diff --git a/gdb/testsuite/gdb.ada/dyn_stride.exp b/gdb/testsuite/gdb.ada/dyn_stride.exp
index 0267ca192bf169c6c8ec0ea5074d927de371747b..dae510611618766401ff56ae346cbf49a5574816 100644 (file)
--- a/gdb/testsuite/gdb.ada/dyn_stride.exp
+++ b/gdb/testsuite/gdb.ada/dyn_stride.exp
@@ -39,3 +39,22 @@ gdb_test "print A1(3)" \
 
 gdb_test "print A1(1..3)" \
          "\\(\\(i => 0, s => \"\"\\), \\(i => 1, s => \"A\"\\), \\(i => 2, s => \"AB\"\\)\\)"
+
+# Test the use of the "repeat" operator (@).
+#
+# Note that, in this case, the repeat operator makes little sense
+# and is NOT equivalent to requesting an array slice. In the case
+# of "print a1(1)@3", the size of each element in the array is
+# variable from element to element.  So, when asked to repeat
+# one element of the array a number of times, you're not guaranteed
+# to get the same answer as in a slice; while the slice will
+# take into account the array stride, the repeat operator uses
+# the size of the object being repeated as its stride, which
+# is often not the same. So, in the test below, the output for
+# the second and third element is not entirely predictable, because
+# it reads part of their contents from a memory region which has
+# an undefined value (the "holes" between the each actual element
+# of the array).
+
+gdb_test "print a1(1)@3" \
+         " = \\(\\(i => 0, s => \"\"\\), \\(i => -?$decimal, s => .*\\), \\(i => -?$decimal, s => .*\\)\\)"