ResolveInfo.cpp revision 5460a1f25d9ddecb5c70667267d66d51af177a99
1//===- ResolveInfo.cpp ----------------------------------------------------===// 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#include "mcld/LD/ResolveInfo.h" 10#include <cstring> 11 12using namespace mcld; 13 14//========================== 15// ResolveInfo 16ResolveInfo::ResolveInfo() 17 : m_Size(0), m_BitField(0) { 18 m_Ptr.sym_ptr = 0; 19} 20 21ResolveInfo::~ResolveInfo() 22{ 23} 24 25void ResolveInfo::override(const ResolveInfo& pFrom) 26{ 27 m_Size = pFrom.m_Size; 28 overrideAttributes(pFrom); 29 overrideVisibility(pFrom); 30} 31 32void ResolveInfo::overrideAttributes(const ResolveInfo& pFrom) 33{ 34 m_BitField &= ~RESOLVE_MASK; 35 m_BitField |= (pFrom.m_BitField & RESOLVE_MASK); 36} 37 38/// overrideVisibility - override the visibility 39/// always use the most strict visibility 40void ResolveInfo::overrideVisibility(const ResolveInfo& pFrom) 41{ 42 // Reference: Google gold linker: resolve.cc 43 // 44 // The rule for combining visibility is that we always choose the 45 // most constrained visibility. In order of increasing constraint, 46 // visibility goes PROTECTED, HIDDEN, INTERNAL. This is the reverse 47 // of the numeric values, so the effect is that we always want the 48 // smallest non-zero value. 49 // 50 // enum { 51 // STV_DEFAULT = 0, 52 // STV_INTERNAL = 1, 53 // STV_HIDDEN = 2, 54 // STV_PROTECTED = 3 55 // }; 56 57 Visibility from_vis = pFrom.visibility(); 58 Visibility cur_vis = visibility(); 59 if (0 != from_vis ) { 60 if (0 == cur_vis) 61 setVisibility(from_vis); 62 else if (cur_vis > from_vis) 63 setVisibility(from_vis); 64 } 65} 66 67void ResolveInfo::setRegular() 68{ 69 m_BitField &= (~dynamic_flag); 70} 71 72void ResolveInfo::setDynamic() 73{ 74 m_BitField |= dynamic_flag; 75} 76 77void ResolveInfo::setSource(bool pIsDyn) 78{ 79 if (pIsDyn) 80 m_BitField |= dynamic_flag; 81 else 82 m_BitField &= (~dynamic_flag); 83} 84 85void ResolveInfo::setType(uint32_t pType) 86{ 87 m_BitField &= ~TYPE_MASK; 88 m_BitField |= ((pType << TYPE_OFFSET) & TYPE_MASK); 89} 90 91void ResolveInfo::setDesc(uint32_t pDesc) 92{ 93 m_BitField &= ~DESC_MASK; 94 m_BitField |= ((pDesc << DESC_OFFSET) & DESC_MASK); 95} 96 97void ResolveInfo::setBinding(uint32_t pBinding) 98{ 99 m_BitField &= ~BINDING_MASK; 100 if (pBinding == Local || pBinding == Absolute) 101 m_BitField |= local_flag; 102 if (pBinding == Weak || pBinding == Absolute) 103 m_BitField |= weak_flag; 104} 105 106void ResolveInfo::setReserved(uint32_t pReserved) 107{ 108 m_BitField &= ~RESERVED_MASK; 109 m_BitField |= ((pReserved << RESERVED_OFFSET) & RESERVED_MASK); 110} 111 112void ResolveInfo::setOther(uint32_t pOther) 113{ 114 setVisibility(static_cast<ResolveInfo::Visibility>(pOther & 0x3)); 115} 116 117void ResolveInfo::setVisibility(ResolveInfo::Visibility pVisibility) 118{ 119 m_BitField &= ~VISIBILITY_MASK; 120 m_BitField |= pVisibility << VISIBILITY_OFFSET; 121} 122 123void ResolveInfo::setIsSymbol(bool pIsSymbol) 124{ 125 if (pIsSymbol) 126 m_BitField |= symbol_flag; 127 else 128 m_BitField &= ~symbol_flag; 129} 130 131bool ResolveInfo::isDyn() const 132{ 133 return (dynamic_flag == (m_BitField & DYN_MASK)); 134} 135 136bool ResolveInfo::isUndef() const 137{ 138 return (undefine_flag == (m_BitField & DESC_MASK)); 139} 140 141bool ResolveInfo::isDefine() const 142{ 143 return (define_flag == (m_BitField & DESC_MASK)); 144} 145 146bool ResolveInfo::isCommon() const 147{ 148 return (common_flag == (m_BitField & DESC_MASK)); 149} 150 151bool ResolveInfo::isIndirect() const 152{ 153 return (indirect_flag == (m_BitField & DESC_MASK)); 154} 155 156// isGlobal - [L,W] == [0, 0] 157bool ResolveInfo::isGlobal() const 158{ 159 return (global_flag == (m_BitField & BINDING_MASK)); 160} 161 162// isWeak - [L,W] == [0, 1] 163bool ResolveInfo::isWeak() const 164{ 165 return (weak_flag == (m_BitField & BINDING_MASK)); 166} 167 168// isLocal - [L,W] == [1, 0] 169bool ResolveInfo::isLocal() const 170{ 171 return (local_flag == (m_BitField & BINDING_MASK)); 172} 173 174// isAbsolute - [L,W] == [1, 1] 175bool ResolveInfo::isAbsolute() const 176{ 177 return (absolute_flag == (m_BitField & BINDING_MASK)); 178} 179 180bool ResolveInfo::isSymbol() const 181{ 182 return (symbol_flag == (m_BitField & SYMBOL_MASK)); 183} 184 185bool ResolveInfo::isString() const 186{ 187 return (string_flag == (m_BitField & SYMBOL_MASK)); 188} 189 190uint32_t ResolveInfo::type() const 191{ 192 return (m_BitField & TYPE_MASK) >> TYPE_OFFSET; 193} 194 195uint32_t ResolveInfo::desc() const 196{ 197 return (m_BitField & DESC_MASK) >> DESC_OFFSET; 198} 199 200uint32_t ResolveInfo::binding() const 201{ 202 if (m_BitField & LOCAL_MASK) { 203 if (m_BitField & GLOBAL_MASK) { 204 return ResolveInfo::Absolute; 205 } 206 return ResolveInfo::Local; 207 } 208 return m_BitField & GLOBAL_MASK; 209} 210 211uint32_t ResolveInfo::reserved() const 212{ 213 return (m_BitField & RESERVED_MASK) >> RESERVED_OFFSET; 214} 215 216ResolveInfo::Visibility ResolveInfo::visibility() const 217{ 218 return static_cast<ResolveInfo::Visibility>((m_BitField & VISIBILITY_MASK) >> VISIBILITY_OFFSET); 219} 220 221bool ResolveInfo::compare(const ResolveInfo::key_type& pKey) 222{ 223 size_t length = nameSize(); 224 if (length != pKey.size()) 225 return false; 226 return (0 == std::memcmp(m_Name, pKey.data(), length)); 227} 228 229