1//===- EhFrameHdr.h -------------------------------------------------------===// 2// 3// The MCLinker Project 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9#ifndef MCLD_EHFRAMEHDR_H 10#define MCLD_EHFRAMEHDR_H 11#ifdef ENABLE_UNITTEST 12#include <gtest.h> 13#endif 14#include <mcld/ADT/SizeTraits.h> 15#include <cassert> 16 17#include <mcld/LD/EhFrame.h> 18namespace mcld { 19 20class LDSection; 21class MemoryArea; 22class MemoryRegion; 23 24/** \class EhFrameHdr 25 * \brief EhFrameHdr represents .eh_frame_hdr section. 26 * 27 * @ref lsb core generic 4.1 28 * .eh_frame_hdr section format 29 * uint8_t : version 30 * uint8_t : eh_frame_ptr_enc 31 * uint8_t : fde_count_enc 32 * uint8_t : table_enc 33 * uint32_t : eh_frame_ptr 34 * uint32_t : fde_count 35 * __________________________ when fde_count > 0 36 * <uint32_t, uint32_t>+ : binary search table 37 */ 38class EhFrameHdr 39{ 40public: 41 EhFrameHdr(LDSection& pEhFrameHdr, const LDSection& pEhFrame); 42 43 ~EhFrameHdr(); 44 45 /// sizeOutput - base on the fde count to size output 46 void sizeOutput(); 47 48 /// emitOutput - write out eh_frame_hdr 49 template<size_t size> 50 void emitOutput(MemoryArea& pOutput) 51 { assert(false && "Call invalid EhFrameHdr::emitOutput"); } 52 53private: 54 /// computePCBegin - return the address of FDE's pc 55 /// @ref binutils gold: ehframe.cc:222 56 uint32_t computePCBegin(const EhFrame::FDE& pFDE, const MemoryRegion& pEhFrameRegion); 57 58private: 59 /// .eh_frame_hdr section 60 LDSection& m_EhFrameHdr; 61 62 /// eh_frame 63 const LDSection& m_EhFrame; 64}; 65 66//===----------------------------------------------------------------------===// 67// Template Specification Functions 68//===----------------------------------------------------------------------===// 69/// emitOutput - write out eh_frame_hdr 70template<> 71void EhFrameHdr::emitOutput<32>(MemoryArea& pOutput); 72 73} // namespace of mcld 74 75#endif 76 77