1f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines//===- ELFAttributeData.cpp -----------------------------------------------===// 2f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines// 3f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines// The MCLinker Project 4f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines// 5f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines// This file is distributed under the University of Illinois Open Source 6f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines// License. See LICENSE.TXT for details. 7f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines// 8f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines//===----------------------------------------------------------------------===// 9f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines#include <mcld/Target/ELFAttributeData.h> 10f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 11f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines#include <mcld/Support/LEB128.h> 12f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines#include <mcld/Target/ELFAttributeValue.h> 13f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines#include <cstring> 14f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines#include <cassert> 15f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 16f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hinesusing namespace mcld; 17f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 18f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hinesbool ELFAttributeData::ReadTag(TagType& pTag, const char* &pBuf, 19f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines size_t &pBufSize) 20f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines{ 21f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines size_t size = 0; 22f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 23f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines pTag = static_cast<ELFAttributeData::TagType>( 24f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines leb128::decode<uint64_t>(pBuf, size)); 25f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 26f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines if (size > pBufSize) 27f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines return false; 28f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 29f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines pBuf += size; 30f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines pBufSize -= size; 31f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 32f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines return true; 33f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines} 34f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 35f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hinesbool ELFAttributeData::ReadValue(ELFAttributeValue& pValue, const char* &pBuf, 36f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines size_t &pBufSize) 37f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines{ 38f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines // An ULEB128-encoded value 39f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines if (pValue.isIntValue()) { 40f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines size_t size = 0; 41f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines uint64_t int_value = leb128::decode<uint64_t>(pBuf, size); 42f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines pValue.setIntValue(static_cast<unsigned int>(int_value)); 43f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 44f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines if (size > pBufSize) 45f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines return false; 46f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 47f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines pBuf += size; 48f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines pBufSize -= size; 49f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines } 50f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 51f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines // A null-terminated byte string 52f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines if (pValue.isStringValue()) { 53f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines pValue.setStringValue(pBuf); 54f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 55f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines size_t size = pValue.getStringValue().length() + 1 /* '\0' */; 56f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines assert(size <= pBufSize); 57f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines pBuf += size; 58f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines pBufSize -= size; 59f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines } 60f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 61f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines return true; 62f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines} 63f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 64f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hinesbool ELFAttributeData::WriteAttribute(TagType pTag, 65f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines const ELFAttributeValue& pValue, 66f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines char* &pBuf) 67f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines{ 68f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines // Write the attribute tag. 69f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines leb128::encode<uint32_t>(pBuf, pTag); 70f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 71f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines // Write the attribute value. 72f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines if (pValue.isIntValue()) 73f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines leb128::encode<uint32_t>(pBuf, pValue.getIntValue()); 74f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 75f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines if (pValue.isStringValue()) { 76f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines // Write string data. 77f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines size_t str_val_len = pValue.getStringValue().length(); 78f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 79f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines if (str_val_len > 0) 80f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines ::memcpy(pBuf, pValue.getStringValue().c_str(), str_val_len); 81f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines pBuf += str_val_len; 82f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 83f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines // Write NULL-terminator. 84f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines *pBuf++ = '\0'; 85f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines } 86f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines 87f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines return true; 88f33f6de54db174aa679a4b6d1e040d37e95541c0Stephen Hines} 89