DwarfUnwinder.h

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef DWARFUNWINDER_H
#define DWARFUNWINDER_H

#include "pedigree/kernel/processor/state_forward.h"
#include "pedigree/kernel/processor/types.h"

class DwarfUnwinder
{
  public:
    DwarfUnwinder(uintptr_t nData, size_t nLength);
    ~DwarfUnwinder();

    bool unwind(
        const ProcessorState &inState, ProcessorState &outState,
        uintptr_t &frameBase);

    static uint32_t decodeUleb128(uint8_t *pBase, uint32_t &nOffset);

    static int32_t decodeSleb128(uint8_t *pBase, uint32_t &nOffset);

  private:
    uintptr_t m_nData;

    size_t m_nLength;
};

#endif