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authorIan Lance Taylor <iant@google.com>2007-09-26 05:44:38 +0000
committerIan Lance Taylor <iant@google.com>2007-09-26 05:44:38 +0000
commit3151305a47fc17a35bc76cc50578b3e8f9b93d9d (patch)
tree7579f01394de3af6a03a35d162ae8c59fefaf9a8 /gold/ehframe.h
parent4dffcebc10670489b064181a62e9588e72fb566a (diff)
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Add basic exception frame header, plus test.
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+// 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)