michael@0: // Copyright 2006 Google Inc. All Rights Reserved.
michael@0: //
michael@0: // Redistribution and use in source and binary forms, with or without
michael@0: // modification, are permitted provided that the following conditions are
michael@0: // met:
michael@0: //
michael@0: //     * Redistributions of source code must retain the above copyright
michael@0: // notice, this list of conditions and the following disclaimer.
michael@0: //     * Redistributions in binary form must reproduce the above
michael@0: // copyright notice, this list of conditions and the following disclaimer
michael@0: // in the documentation and/or other materials provided with the
michael@0: // distribution.
michael@0: //     * Neither the name of Google Inc. nor the names of its
michael@0: // contributors may be used to endorse or promote products derived from
michael@0: // this software without specific prior written permission.
michael@0: //
michael@0: // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
michael@0: // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
michael@0: // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
michael@0: // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
michael@0: // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
michael@0: // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
michael@0: // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
michael@0: // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
michael@0: // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
michael@0: // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
michael@0: // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0: 
michael@0: #ifndef UTIL_DEBUGINFO_BYTEREADER_INL_H__
michael@0: #define UTIL_DEBUGINFO_BYTEREADER_INL_H__
michael@0: 
michael@0: #include "common/dwarf/bytereader.h"
michael@0: 
michael@0: #include <assert.h>
michael@0: 
michael@0: namespace dwarf2reader {
michael@0: 
michael@0: inline uint8 ByteReader::ReadOneByte(const char* buffer) const {
michael@0:   return buffer[0];
michael@0: }
michael@0: 
michael@0: inline uint16 ByteReader::ReadTwoBytes(const char* signed_buffer) const {
michael@0:   const unsigned char *buffer
michael@0:     = reinterpret_cast<const unsigned char *>(signed_buffer);
michael@0:   const uint16 buffer0 = buffer[0];
michael@0:   const uint16 buffer1 = buffer[1];
michael@0:   if (endian_ == ENDIANNESS_LITTLE) {
michael@0:     return buffer0 | buffer1 << 8;
michael@0:   } else {
michael@0:     return buffer1 | buffer0 << 8;
michael@0:   }
michael@0: }
michael@0: 
michael@0: inline uint64 ByteReader::ReadFourBytes(const char* signed_buffer) const {
michael@0:   const unsigned char *buffer
michael@0:     = reinterpret_cast<const unsigned char *>(signed_buffer);
michael@0:   const uint32 buffer0 = buffer[0];
michael@0:   const uint32 buffer1 = buffer[1];
michael@0:   const uint32 buffer2 = buffer[2];
michael@0:   const uint32 buffer3 = buffer[3];
michael@0:   if (endian_ == ENDIANNESS_LITTLE) {
michael@0:     return buffer0 | buffer1 << 8 | buffer2 << 16 | buffer3 << 24;
michael@0:   } else {
michael@0:     return buffer3 | buffer2 << 8 | buffer1 << 16 | buffer0 << 24;
michael@0:   }
michael@0: }
michael@0: 
michael@0: inline uint64 ByteReader::ReadEightBytes(const char* signed_buffer) const {
michael@0:   const unsigned char *buffer
michael@0:     = reinterpret_cast<const unsigned char *>(signed_buffer);
michael@0:   const uint64 buffer0 = buffer[0];
michael@0:   const uint64 buffer1 = buffer[1];
michael@0:   const uint64 buffer2 = buffer[2];
michael@0:   const uint64 buffer3 = buffer[3];
michael@0:   const uint64 buffer4 = buffer[4];
michael@0:   const uint64 buffer5 = buffer[5];
michael@0:   const uint64 buffer6 = buffer[6];
michael@0:   const uint64 buffer7 = buffer[7];
michael@0:   if (endian_ == ENDIANNESS_LITTLE) {
michael@0:     return buffer0 | buffer1 << 8 | buffer2 << 16 | buffer3 << 24 |
michael@0:       buffer4 << 32 | buffer5 << 40 | buffer6 << 48 | buffer7 << 56;
michael@0:   } else {
michael@0:     return buffer7 | buffer6 << 8 | buffer5 << 16 | buffer4 << 24 |
michael@0:       buffer3 << 32 | buffer2 << 40 | buffer1 << 48 | buffer0 << 56;
michael@0:   }
michael@0: }
michael@0: 
michael@0: // Read an unsigned LEB128 number.  Each byte contains 7 bits of
michael@0: // information, plus one bit saying whether the number continues or
michael@0: // not.
michael@0: 
michael@0: inline uint64 ByteReader::ReadUnsignedLEB128(const char* buffer,
michael@0:                                              size_t* len) const {
michael@0:   uint64 result = 0;
michael@0:   size_t num_read = 0;
michael@0:   unsigned int shift = 0;
michael@0:   unsigned char byte;
michael@0: 
michael@0:   do {
michael@0:     byte = *buffer++;
michael@0:     num_read++;
michael@0: 
michael@0:     result |= (static_cast<uint64>(byte & 0x7f)) << shift;
michael@0: 
michael@0:     shift += 7;
michael@0: 
michael@0:   } while (byte & 0x80);
michael@0: 
michael@0:   *len = num_read;
michael@0: 
michael@0:   return result;
michael@0: }
michael@0: 
michael@0: // Read a signed LEB128 number.  These are like regular LEB128
michael@0: // numbers, except the last byte may have a sign bit set.
michael@0: 
michael@0: inline int64 ByteReader::ReadSignedLEB128(const char* buffer,
michael@0:                                           size_t* len) const {
michael@0:   int64 result = 0;
michael@0:   unsigned int shift = 0;
michael@0:   size_t num_read = 0;
michael@0:   unsigned char byte;
michael@0: 
michael@0:   do {
michael@0:       byte = *buffer++;
michael@0:       num_read++;
michael@0:       result |= (static_cast<uint64>(byte & 0x7f) << shift);
michael@0:       shift += 7;
michael@0:   } while (byte & 0x80);
michael@0: 
michael@0:   if ((shift < 8 * sizeof (result)) && (byte & 0x40))
michael@0:     result |= -((static_cast<int64>(1)) << shift);
michael@0:   *len = num_read;
michael@0:   return result;
michael@0: }
michael@0: 
michael@0: inline uint64 ByteReader::ReadOffset(const char* buffer) const {
michael@0:   assert(this->offset_reader_);
michael@0:   return (this->*offset_reader_)(buffer);
michael@0: }
michael@0: 
michael@0: inline uint64 ByteReader::ReadAddress(const char* buffer) const {
michael@0:   assert(this->address_reader_);
michael@0:   return (this->*address_reader_)(buffer);
michael@0: }
michael@0: 
michael@0: inline void ByteReader::SetCFIDataBase(uint64 section_base,
michael@0:                                        const char *buffer_base) {
michael@0:   section_base_ = section_base;
michael@0:   buffer_base_ = buffer_base;
michael@0:   have_section_base_ = true;
michael@0: }
michael@0: 
michael@0: inline void ByteReader::SetTextBase(uint64 text_base) {
michael@0:   text_base_ = text_base;
michael@0:   have_text_base_ = true;
michael@0: }
michael@0: 
michael@0: inline void ByteReader::SetDataBase(uint64 data_base) {
michael@0:   data_base_ = data_base;
michael@0:   have_data_base_ = true;
michael@0: }
michael@0: 
michael@0: inline void ByteReader::SetFunctionBase(uint64 function_base) {
michael@0:   function_base_ = function_base;
michael@0:   have_function_base_ = true;
michael@0: }
michael@0: 
michael@0: inline void ByteReader::ClearFunctionBase() {
michael@0:   have_function_base_ = false;
michael@0: }
michael@0: 
michael@0: }  // namespace dwarf2reader
michael@0: 
michael@0: #endif  // UTIL_DEBUGINFO_BYTEREADER_INL_H__