Adjust for monotone.

1 files changed, 58 insertions, 0 deletions

diff --git a/libdw/dwarf_getsrc_die.c b/libdw/dwarf_getsrc_die.c
new file mode 100644
index 00000000..e3ce4f2a
--- /dev/null
+++ b/libdw/dwarf_getsrc_die.c
@@ -0,0 +1,58 @@
+/* Find line information for address.
+   Copyright (C) 2004, 2005 Red Hat, Inc.
+   Written by Ulrich Drepper <[email protected]>, 2004.
+
+   This program is Open Source software; you can redistribute it and/or
+   modify it under the terms of the Open Software License version 1.0 as
+   published by the Open Source Initiative.
+
+   You should have received a copy of the Open Software License along
+   with this program; if not, you may obtain a copy of the Open Software
+   License version 1.0 from http://www.opensource.org/licenses/osl.php or
+   by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
+   3001 King Ranch Road, Ukiah, CA 95482.   */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "libdwP.h"
+#include <assert.h>
+
+
+Dwarf_Line *
+dwarf_getsrc_die (Dwarf_Die *cudie, Dwarf_Addr addr)
+{
+  Dwarf_Lines *lines;
+  size_t nlines;
+
+  if (INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines) != 0)
+    return NULL;
+
+  /* The lines are sorted by address, so we can use binary search.  */
+  size_t l = 0, u = nlines;
+  while (l < u)
+    {
+      size_t idx = (l + u) / 2;
+      if (addr < lines->info[idx].addr)
+	u = idx;
+      else if (addr > lines->info[idx].addr)
+	l = idx + 1;
+      else
+	return &lines->info[idx];
+    }
+
+  if (nlines > 0)
+    assert (lines->info[nlines - 1].end_sequence);
+
+  /* If none were equal, the closest one below is what we want.  We
+     never want the last one, because it's the end-sequence marker
+     with an address at the high bound of the CU's code.  If the debug
+     information is faulty and no end-sequence marker is present, we
+     still ignore it.  */
+  if (u > 0 && u < nlines && addr > lines->info[u - 1].addr)
+    return &lines->info[u - 1];
+
+  __libdw_seterrno (DWARF_E_ADDR_OUTOFRANGE);
+  return NULL;
+}