Fix condition propagation across aliases

When an instance of an alias has a condition, that condition gets
propagated to each of the locations that the alias defines.  However,
the copy of the location list was not a deep copy, and so all other
instances of the alias would also incorrectly receive the condition.

This patch makes the location list copy a little deeper, and adds a
test case which demonstrates the issue.

2 files changed, 31 insertions, 0 deletions

diff --git a/testsuite/systemtap.base/alias-condition.exp b/testsuite/systemtap.base/alias-condition.exp
new file mode 100644
index 00000000..58438340
--- /dev/null
+++ b/testsuite/systemtap.base/alias-condition.exp
@@ -0,0 +1,5 @@
+# Check that conditions are copied correctly across aliases
+
+set test "alias-condition"
+
+stap_run $srcdir/$subdir/$test.stp no_load $all_pass_string
diff --git a/testsuite/systemtap.base/alias-condition.stp b/testsuite/systemtap.base/alias-condition.stp
new file mode 100644
index 00000000..89708886
--- /dev/null
+++ b/testsuite/systemtap.base/alias-condition.stp
@@ -0,0 +1,26 @@
+/*
+ * alias-condition.stp
+ *
+ * Check that conditions are copied correctly across aliases
+ */
+
+/* x should be incremented exactly once */
+global x = 0
+probe foo = begin { }
+probe foo if (x < 0), foo { ++x }
+
+probe begin(1)
+{
+    println("systemtap starting probe")
+    exit()
+}
+
+probe end
+{
+    println("systemtap ending probe")
+    if ( x != 1 ) {
+        println("systemtap test failure")
+    } else {
+        println("systemtap test success")
+    }
+}