Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 138 insertions, 0 deletions

diff --git a/REORG.TODO/nptl/unwind.c b/REORG.TODO/nptl/unwind.c
new file mode 100644
index 0000000000..db3108ff64
--- /dev/null
+++ b/REORG.TODO/nptl/unwind.c
@@ -0,0 +1,138 @@
+/* Copyright (C) 2003-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>
+   and Richard Henderson <rth@redhat.com>, 2003.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <setjmp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "pthreadP.h"
+#include <jmpbuf-unwind.h>
+
+#ifdef _STACK_GROWS_DOWN
+# define FRAME_LEFT(frame, other, adj) \
+  ((uintptr_t) frame - adj >= (uintptr_t) other - adj)
+#elif _STACK_GROWS_UP
+# define FRAME_LEFT(frame, other, adj) \
+  ((uintptr_t) frame - adj <= (uintptr_t) other - adj)
+#else
+# error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
+#endif
+
+static _Unwind_Reason_Code
+unwind_stop (int version, _Unwind_Action actions,
+	     _Unwind_Exception_Class exc_class,
+	     struct _Unwind_Exception *exc_obj,
+	     struct _Unwind_Context *context, void *stop_parameter)
+{
+  struct pthread_unwind_buf *buf = stop_parameter;
+  struct pthread *self = THREAD_SELF;
+  struct _pthread_cleanup_buffer *curp = THREAD_GETMEM (self, cleanup);
+  int do_longjump = 0;
+
+  /* Adjust all pointers used in comparisons, so that top of thread's
+     stack is at the top of address space.  Without that, things break
+     if stack is allocated above the main stack.  */
+  uintptr_t adj = (uintptr_t) self->stackblock + self->stackblock_size;
+
+  /* Do longjmp if we're at "end of stack", aka "end of unwind data".
+     We assume there are only C frame without unwind data in between
+     here and the jmp_buf target.  Otherwise simply note that the CFA
+     of a function is NOT within it's stack frame; it's the SP of the
+     previous frame.  */
+  if ((actions & _UA_END_OF_STACK)
+      || ! _JMPBUF_CFA_UNWINDS_ADJ (buf->cancel_jmp_buf[0].jmp_buf, context,
+				    adj))
+    do_longjump = 1;
+
+  if (__glibc_unlikely (curp != NULL))
+    {
+      /* Handle the compatibility stuff.  Execute all handlers
+	 registered with the old method which would be unwound by this
+	 step.  */
+      struct _pthread_cleanup_buffer *oldp = buf->priv.data.cleanup;
+      void *cfa = (void *) (_Unwind_Ptr) _Unwind_GetCFA (context);
+
+      if (curp != oldp && (do_longjump || FRAME_LEFT (cfa, curp, adj)))
+	{
+	  do
+	    {
+	      /* Pointer to the next element.  */
+	      struct _pthread_cleanup_buffer *nextp = curp->__prev;
+
+	      /* Call the handler.  */
+	      curp->__routine (curp->__arg);
+
+	      /* To the next.  */
+	      curp = nextp;
+	    }
+	  while (curp != oldp
+		 && (do_longjump || FRAME_LEFT (cfa, curp, adj)));
+
+	  /* Mark the current element as handled.  */
+	  THREAD_SETMEM (self, cleanup, curp);
+	}
+    }
+
+  if (do_longjump)
+    __libc_unwind_longjmp ((struct __jmp_buf_tag *) buf->cancel_jmp_buf, 1);
+
+  return _URC_NO_REASON;
+}
+
+
+static void
+unwind_cleanup (_Unwind_Reason_Code reason, struct _Unwind_Exception *exc)
+{
+  /* When we get here a C++ catch block didn't rethrow the object.  We
+     cannot handle this case and therefore abort.  */
+  __libc_fatal ("FATAL: exception not rethrown\n");
+}
+
+
+void
+__cleanup_fct_attribute __attribute ((noreturn))
+__pthread_unwind (__pthread_unwind_buf_t *buf)
+{
+  struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
+  struct pthread *self = THREAD_SELF;
+
+  /* This is not a catchable exception, so don't provide any details about
+     the exception type.  We do need to initialize the field though.  */
+  THREAD_SETMEM (self, exc.exception_class, 0);
+  THREAD_SETMEM (self, exc.exception_cleanup, &unwind_cleanup);
+
+  _Unwind_ForcedUnwind (&self->exc, unwind_stop, ibuf);
+  /* NOTREACHED */
+
+  /* We better do not get here.  */
+  abort ();
+}
+hidden_def (__pthread_unwind)
+
+
+void
+__cleanup_fct_attribute __attribute ((noreturn))
+__pthread_unwind_next (__pthread_unwind_buf_t *buf)
+{
+  struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
+
+  __pthread_unwind ((__pthread_unwind_buf_t *) ibuf->priv.data.prev);
+}
+hidden_def (__pthread_unwind_next)