Add basic exception frame header, plus test.

1 files changed, 64 insertions, 0 deletions

diff --git a/gold/ehframe.h b/gold/ehframe.h
new file mode 100644
index 0000000..1f6c022
--- /dev/null
+++ b/gold/ehframe.h
@@ -0,0 +1,64 @@
+// ehframe.h -- handle exception frame sections for gold  -*- C++ -*-
+
+// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Written by Ian Lance Taylor <iant@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+#ifndef GOLD_EHFRAME_H
+#define GOLD_EHFRAME_H
+
+#include "output.h"
+
+namespace gold
+{
+
+// This class manages the .eh_frame_hdr section, which holds the data
+// for the PT_GNU_EH_FRAME segment.  gcc's unwind support code uses
+// the PT_GNU_EH_FRAME segment to find the list of FDEs.  This saves
+// the time required to register the exception handlers at startup
+// time and when a shared object is loaded, and the time required to
+// deregister the exception handlers when a shared object is unloaded.
+
+// FIXME: gcc supports using storing a sorted lookup table for the
+// FDEs in the PT_GNU_EH_FRAME segment, but we do not yet generate
+// that.
+
+class Eh_frame_hdr : public Output_section_data
+{
+ public:
+  Eh_frame_hdr(const Target*, Output_section* eh_frame_section);
+
+  // Set the final data size.
+  void
+  do_set_address(uint64_t address, off_t offset);
+
+  // Write the data to the file.
+  void
+  do_write(Output_file*);
+
+ private:
+  // The output target.
+  const Target* target_;
+  // The .eh_frame section.
+  Output_section* eh_frame_section_;
+};
+
+} // End namespace gold.
+
+#endif // !defined(GOLD_EHFRAME_H)