From 03c75a4a21ef3dba8abbc7e596d2a102427a3d96 Mon Sep 17 00:00:00 2001
From: Josh Stone <jistone@redhat.com>
Date: Wed, 15 Jul 2009 18:21:56 -0700
Subject: PR5930: Address-op for $target and @cast members

This allows the '&' operator to get the address of @cast and $target
variable expressions.

* staptree.h (target_symbol): add addressof field
* staptree.cxx (target_symbol::print): print '&' for addressof
  (cast_op::print): ditto
* parse.cxx (parser::parse_value): allow '&' prefix on $target/@cast
* dwflpp.cxx (dwflpp::translate_final_fetch_or_store): allow taking the
  computed address without actually doing a final fetch.
* tapset* (*::visit_target_symbol): throw errors for $vars w/o addresses
* testsuite/systemtap.base/cast.stp: add &@cast test
* testsuite/semok/target_addr.stp: test '&' on different member types
* testsuite/semko/target_addr?.stp: test failure on bitfields/registers
---
 testsuite/semok/target_addr.stp | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100755 testsuite/semok/target_addr.stp

(limited to 'testsuite/semok')

diff --git a/testsuite/semok/target_addr.stp b/testsuite/semok/target_addr.stp
new file mode 100755
index 00000000..dfbc2606
--- /dev/null
+++ b/testsuite/semok/target_addr.stp
@@ -0,0 +1,11 @@
+#! stap -p2
+
+// read the address of various task_struct members.
+// all should roughly be $p + offsetof(foo)
+probe kernel.function("release_task") {
+    println(& $p->state)  // long
+    println(& $p->usage)  // atomic_t
+    println(& $p->comm)   // comm[TASK_COMM_LEN]
+    println(& $p->comm[1])
+    println(& $p->parent) // task_struct*
+}
-- 
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