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Commit ce124179 authored by Christopher Ferris's avatar Christopher Ferris Committed by Gerrit Code Review
Browse files

Merge "Add DwarfMemory class."

parents 9ead7c4a 72a6fa69

libunwindstack/Android.bp

+2 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ cc_defaults { 


    srcs: [

        "ArmExidx.cpp",

        "DwarfMemory.cpp",

        "Elf.cpp",

        "ElfInterface.cpp",

        "ElfInterfaceArm.cpp",
@@ -87,6 +88,7 @@ cc_defaults { 
    srcs: [

        "tests/ArmExidxDecodeTest.cpp",

        "tests/ArmExidxExtractTest.cpp",

        "tests/DwarfMemoryTest.cpp",

        "tests/ElfInterfaceArmTest.cpp",

        "tests/ElfInterfaceTest.cpp",

        "tests/ElfTest.cpp",

libunwindstack/DwarfEncoding.h

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Original line number Diff line number Diff line 
/*

 * Copyright (C) 2016 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



#ifndef _LIBUNWINDSTACK_DWARF_ENCODING_H

#define _LIBUNWINDSTACK_DWARF_ENCODING_H



#include <stdint.h>



enum DwarfEncoding : uint8_t {

  DW_EH_PE_omit = 0xff,



  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,



  // The following are special values used to encode CFA and OP operands.

  DW_EH_PE_udata1 = 0x0d,

  DW_EH_PE_sdata1 = 0x0e,

  DW_EH_PE_block = 0x0f,

};



#endif  // _LIBUNWINDSTACK_DWARF_ENCODING_H

libunwindstack/DwarfMemory.cpp

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Original line number Diff line number Diff line 
/*

 * Copyright (C) 2017 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



#include <assert.h>

#include <stdint.h>



#include <string>



#include "DwarfEncoding.h"

#include "DwarfMemory.h"

#include "Memory.h"



bool DwarfMemory::ReadBytes(void* dst, size_t num_bytes) {

  if (!memory_->Read(cur_offset_, dst, num_bytes)) {

    return false;

  }

  cur_offset_ += num_bytes;

  return true;

}



template <typename SignedType>

bool DwarfMemory::ReadSigned(uint64_t* value) {

  SignedType signed_value;

  if (!ReadBytes(&signed_value, sizeof(SignedType))) {

    return false;

  }

  *value = static_cast<int64_t>(signed_value);

  return true;

}



bool DwarfMemory::ReadULEB128(uint64_t* value) {

  uint64_t cur_value = 0;

  uint64_t shift = 0;

  uint8_t byte;

  do {

    if (!ReadBytes(&byte, 1)) {

      return false;

    }

    cur_value += static_cast<uint64_t>(byte & 0x7f) << shift;

    shift += 7;

  } while (byte & 0x80);

  *value = cur_value;

  return true;

}



bool DwarfMemory::ReadSLEB128(int64_t* value) {

  uint64_t cur_value = 0;

  uint64_t shift = 0;

  uint8_t byte;

  do {

    if (!ReadBytes(&byte, 1)) {

      return false;

    }

    cur_value += static_cast<uint64_t>(byte & 0x7f) << shift;

    shift += 7;

  } while (byte & 0x80);

  if (byte & 0x40) {

    // Negative value, need to sign extend.

    cur_value |= static_cast<uint64_t>(-1) << shift;

  }

  *value = static_cast<int64_t>(cur_value);

  return true;

}



template <typename AddressType>

size_t DwarfMemory::GetEncodedSize(uint8_t encoding) {

  switch (encoding & 0x0f) {

    case DW_EH_PE_absptr:

      return sizeof(AddressType);

    case DW_EH_PE_udata1:

    case DW_EH_PE_sdata1:

      return 1;

    case DW_EH_PE_udata2:

    case DW_EH_PE_sdata2:

      return 2;

    case DW_EH_PE_udata4:

    case DW_EH_PE_sdata4:

      return 4;

    case DW_EH_PE_udata8:

    case DW_EH_PE_sdata8:

      return 8;

    case DW_EH_PE_uleb128:

    case DW_EH_PE_sleb128:

    default:

      return 0;

  }

}



bool DwarfMemory::AdjustEncodedValue(uint8_t encoding, uint64_t* value) {

  assert((encoding & 0x0f) == 0);

  assert(encoding != DW_EH_PE_aligned);



  // Handle the encoding.

  switch (encoding) {

    case DW_EH_PE_absptr:

      // Nothing to do.

      break;

    case DW_EH_PE_pcrel:

      if (pc_offset_ == static_cast<uint64_t>(-1)) {

        // Unsupported encoding.

        return false;

      }

      *value += pc_offset_;

      break;

    case DW_EH_PE_textrel:

      if (text_offset_ == static_cast<uint64_t>(-1)) {

        // Unsupported encoding.

        return false;

      }

      *value += text_offset_;

      break;

    case DW_EH_PE_datarel:

      if (data_offset_ == static_cast<uint64_t>(-1)) {

        // Unsupported encoding.

        return false;

      }

      *value += data_offset_;

      break;

    case DW_EH_PE_funcrel:

      if (func_offset_ == static_cast<uint64_t>(-1)) {

        // Unsupported encoding.

        return false;

      }

      *value += func_offset_;

      break;

    default:

      return false;

  }



  return true;

}



template <typename AddressType>

bool DwarfMemory::ReadEncodedValue(uint8_t encoding, uint64_t* value) {

  if (encoding == DW_EH_PE_omit) {

    *value = 0;

    return true;

  } else if (encoding == DW_EH_PE_aligned) {

    if (__builtin_add_overflow(cur_offset_, sizeof(AddressType) - 1, &cur_offset_)) {

      return false;

    }

    cur_offset_ &= -sizeof(AddressType);



    if (sizeof(AddressType) != sizeof(uint64_t)) {

      *value = 0;

    }

    return ReadBytes(value, sizeof(AddressType));

  }



  // Get the data.

  switch (encoding & 0x0f) {

    case DW_EH_PE_absptr:

      if (sizeof(AddressType) != sizeof(uint64_t)) {

        *value = 0;

      }

      if (!ReadBytes(value, sizeof(AddressType))) {

        return false;

      }

      break;

    case DW_EH_PE_uleb128:

      if (!ReadULEB128(value)) {

        return false;

      }

      break;

    case DW_EH_PE_sleb128:

      int64_t signed_value;

      if (!ReadSLEB128(&signed_value)) {

        return false;

      }

      *value = static_cast<uint64_t>(signed_value);

      break;

    case DW_EH_PE_udata1: {

      uint8_t value8;

      if (!ReadBytes(&value8, 1)) {

        return false;

      }

      *value = value8;

    } break;

    case DW_EH_PE_sdata1:

      if (!ReadSigned<int8_t>(value)) {

        return false;

      }

      break;

    case DW_EH_PE_udata2: {

      uint16_t value16;

      if (!ReadBytes(&value16, 2)) {

        return false;

      }

      *value = value16;

    } break;

    case DW_EH_PE_sdata2:

      if (!ReadSigned<int16_t>(value)) {

        return false;

      }

      break;

    case DW_EH_PE_udata4: {

      uint32_t value32;

      if (!ReadBytes(&value32, 4)) {

        return false;

      }

      *value = value32;

    } break;

    case DW_EH_PE_sdata4:

      if (!ReadSigned<int32_t>(value)) {

        return false;

      }

      break;

    case DW_EH_PE_udata8:

      if (!ReadBytes(value, sizeof(uint64_t))) {

        return false;

      }

      break;

    case DW_EH_PE_sdata8:

      if (!ReadSigned<int64_t>(value)) {

        return false;

      }

      break;

    default:

      return false;

  }



  return AdjustEncodedValue(encoding & 0xf0, value);

}



// Instantiate all of the needed template functions.

template bool DwarfMemory::ReadSigned<int8_t>(uint64_t*);

template bool DwarfMemory::ReadSigned<int16_t>(uint64_t*);

template bool DwarfMemory::ReadSigned<int32_t>(uint64_t*);

template bool DwarfMemory::ReadSigned<int64_t>(uint64_t*);



template size_t DwarfMemory::GetEncodedSize<uint32_t>(uint8_t);

template size_t DwarfMemory::GetEncodedSize<uint64_t>(uint8_t);



template bool DwarfMemory::ReadEncodedValue<uint32_t>(uint8_t, uint64_t*);

template bool DwarfMemory::ReadEncodedValue<uint64_t>(uint8_t, uint64_t*);

libunwindstack/DwarfMemory.h

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Original line number Diff line number Diff line 
/*

 * Copyright (C) 2016 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



#ifndef _LIBUNWINDSTACK_DWARF_MEMORY_H

#define _LIBUNWINDSTACK_DWARF_MEMORY_H



#include <stdint.h>



// Forward declarations.

class Memory;



class DwarfMemory {

 public:

  DwarfMemory(Memory* memory) : memory_(memory) {}

  virtual ~DwarfMemory() = default;



  bool ReadBytes(void* dst, size_t num_bytes);



  template <typename SignedType>

  bool ReadSigned(uint64_t* value);



  bool ReadULEB128(uint64_t* value);



  bool ReadSLEB128(int64_t* value);



  template <typename AddressType>

  size_t GetEncodedSize(uint8_t encoding);



  bool AdjustEncodedValue(uint8_t encoding, uint64_t* value);



  template <typename AddressType>

  bool ReadEncodedValue(uint8_t encoding, uint64_t* value);



  uint64_t cur_offset() { return cur_offset_; }

  void set_cur_offset(uint64_t cur_offset) { cur_offset_ = cur_offset; }



  void set_pc_offset(uint64_t offset) { pc_offset_ = offset; }

  void clear_pc_offset() { pc_offset_ = static_cast<uint64_t>(-1); }



  void set_data_offset(uint64_t offset) { data_offset_ = offset; }

  void clear_data_offset() { data_offset_ = static_cast<uint64_t>(-1); }



  void set_func_offset(uint64_t offset) { func_offset_ = offset; }

  void clear_func_offset() { func_offset_ = static_cast<uint64_t>(-1); }



  void set_text_offset(uint64_t offset) { text_offset_ = offset; }

  void clear_text_offset() { text_offset_ = static_cast<uint64_t>(-1); }



 private:

  Memory* memory_;

  uint64_t cur_offset_ = 0;



  uint64_t pc_offset_ = static_cast<uint64_t>(-1);

  uint64_t data_offset_ = static_cast<uint64_t>(-1);

  uint64_t func_offset_ = static_cast<uint64_t>(-1);

  uint64_t text_offset_ = static_cast<uint64_t>(-1);

};



#endif  // _LIBUNWINDSTACK_DWARF_MEMORY_H

libunwindstack/tests/DwarfMemoryTest.cpp

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