Merge branch 'stack-top' of git://github.com/alexrp/druntime

import/core/thread.di

@@ -668,10 +668,26 @@ alias IsMarked delegate( void* addr ) IsMarkedDg;
 extern(C) void thread_processGCMarks( scope IsMarkedDg isMarked );
 
 
+/**
+ * Returns the stack top of the currently active stack within the calling
+ * thread.
+ *
+ * In:
+ *  The calling thread must be attached to the runtime.
+ *
+ * Returns:
+ *  The address of the stack top.
+ */
+extern (C) void* thread_stackTop();
+
+
 /**
  * Returns the stack bottom of the currently active stack within the calling
  * thread.
  *
+ * In:
+ *  The calling thread must be attached to the runtime.
+ *
  * Returns:
  *  The address of the stack bottom.
  */

src/core/thread.d

@@ -2866,7 +2866,24 @@ private void* getStackBottom()
 }
 
 
+extern (C) void* thread_stackTop()
+in
+{
+    // Not strictly required, but it gives us more flexibility.
+    assert(Thread.getThis());
+}
+body
+{
+    return getStackTop();
+}
+
+
 extern (C) void* thread_stackBottom()
+in
+{
+    assert(Thread.getThis());
+}
+body
 {
     return Thread.getThis().topContext().bstack;
 }