sources/cxx-stl/gabi++/src/dwarf_helper.h

// Copyright (C) 2012 The Android Open Source Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
//    may be used to endorse or promote products derived from this software
//    without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//
//  This file implements the "Exception Handling APIs"
//  http://www.codesourcery.com/public/cxx-abi/abi-eh.html
//  http://www.intel.com/design/itanium/downloads/245358.htm
//
//===----------------------------------------------------------------------===//

#ifndef __GXXABI_DWARF_HELPER_H
#define __GXXABI_DWARF_HELPER_H

#include <cstdint>
#include <unwind.h>

namespace __cxxabiv1 {

  enum {
    DW_EH_PE_absptr   = 0x00,
    DW_EH_PE_uleb128  = 0x01,
    DW_EH_PE_udata2   = 0x02,
    DW_EH_PE_udata4   = 0x03,
    DW_EH_PE_udata8   = 0x04,
    DW_EH_PE_sleb128  = 0x09,
    DW_EH_PE_sdata2   = 0x0A,
    DW_EH_PE_sdata4   = 0x0B,
    DW_EH_PE_sdata8   = 0x0C,
    DW_EH_PE_pcrel    = 0x10,
    DW_EH_PE_textrel  = 0x20,
    DW_EH_PE_datarel  = 0x30,
    DW_EH_PE_funcrel  = 0x40,
    DW_EH_PE_aligned  = 0x50,
    DW_EH_PE_indirect = 0x80,
    DW_EH_PE_omit     = 0xFF
  };

  // Buffer to cache some information during PR
  struct ScanResultInternal {
    int64_t        ttypeIndex;   // > 0 catch handler, < 0 exception spec handler, == 0 a cleanup
    const uint8_t* actionRecord;         // Currently unused.  Retained to ease future maintenance.
    const uint8_t* languageSpecificData;  // Needed only for __cxa_call_unexpected
    uintptr_t      landingPad;   // null -> nothing found, else something found
    void*          adjustedPtr;  // Used in cxa_exception.cpp
    _Unwind_Reason_Code reason;  // One of _URC_FATAL_PHASE1_ERROR,
                                 //        _URC_FATAL_PHASE2_ERROR,
                                 //        _URC_CONTINUE_UNWIND,
                                 //        _URC_HANDLER_FOUND
  };

  uintptr_t readULEB128(const uint8_t** data);
  intptr_t readSLEB128(const uint8_t** data);
  uintptr_t readEncodedPointer(const uint8_t** data,
                               uint8_t encoding);

} // namespace __cxxabiv1

#endif // __GXXABI_DWARF_HELPER_H