1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2019 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // Pass.impl.hpp -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Thu May 09 15::37::05 2019 |
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11 | // Last Modified By : |
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12 | // Last Modified On : |
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13 | // Update Count : |
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14 | // |
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15 | |
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16 | #pragma once |
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17 | // IWYU pragma: private, include "Pass.hpp" |
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18 | |
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19 | #include "Common/Stats/Heap.h" |
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20 | |
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21 | namespace ast { |
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22 | template<typename core_t> |
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23 | class Pass; |
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24 | |
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25 | struct TranslationUnit; |
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26 | |
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27 | struct PureVisitor; |
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28 | |
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29 | namespace __pass { |
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30 | typedef std::function<void( void * )> cleanup_func_t; |
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31 | typedef std::function<void( cleanup_func_t, void * )> at_cleanup_t; |
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32 | |
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33 | |
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34 | // boolean reference that may be null |
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35 | // either refers to a boolean value or is null and returns true |
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36 | class bool_ref { |
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37 | public: |
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38 | bool_ref() = default; |
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39 | ~bool_ref() = default; |
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40 | |
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41 | operator bool() { return m_ref ? *m_ref : true; } |
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42 | bool operator=( bool val ) { assert(m_ref); return *m_ref = val; } |
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43 | |
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44 | private: |
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45 | |
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46 | friend class visit_children_guard; |
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47 | |
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48 | bool * set( bool * val ) { |
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49 | bool * prev = m_ref; |
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50 | m_ref = val; |
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51 | return prev; |
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52 | } |
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53 | |
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54 | bool * m_ref = nullptr; |
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55 | }; |
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56 | |
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57 | // Implementation of the guard value |
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58 | // Created inside the visit scope |
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59 | class guard_value { |
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60 | public: |
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61 | /// Push onto the cleanup |
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62 | guard_value( at_cleanup_t * at_cleanup ) { |
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63 | if( at_cleanup ) { |
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64 | *at_cleanup = [this]( cleanup_func_t && func, void* val ) { |
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65 | push( std::move( func ), val ); |
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66 | }; |
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67 | } |
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68 | } |
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69 | |
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70 | ~guard_value() { |
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71 | while( !cleanups.empty() ) { |
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72 | auto& cleanup = cleanups.top(); |
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73 | cleanup.func( cleanup.val ); |
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74 | cleanups.pop(); |
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75 | } |
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76 | } |
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77 | |
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78 | void push( cleanup_func_t && func, void* val ) { |
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79 | cleanups.emplace( std::move(func), val ); |
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80 | } |
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81 | |
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82 | private: |
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83 | struct cleanup_t { |
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84 | cleanup_func_t func; |
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85 | void * val; |
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86 | |
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87 | cleanup_t( cleanup_func_t&& func, void * val ) : func(func), val(val) {} |
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88 | }; |
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89 | |
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90 | std::stack< cleanup_t, std::vector<cleanup_t> > cleanups; |
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91 | }; |
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92 | |
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93 | // Guard structure implementation for whether or not children should be visited |
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94 | class visit_children_guard { |
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95 | public: |
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96 | |
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97 | visit_children_guard( bool_ref * ref ) |
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98 | : m_val ( true ) |
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99 | , m_prev( ref ? ref->set( &m_val ) : nullptr ) |
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100 | , m_ref ( ref ) |
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101 | {} |
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102 | |
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103 | ~visit_children_guard() { |
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104 | if( m_ref ) { |
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105 | m_ref->set( m_prev ); |
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106 | } |
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107 | } |
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108 | |
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109 | operator bool() { return m_val; } |
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110 | |
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111 | private: |
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112 | bool m_val; |
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113 | bool * m_prev; |
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114 | bool_ref * m_ref; |
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115 | }; |
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116 | |
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117 | /// "Short hand" to check if this is a valid previsit function |
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118 | /// Mostly used to make the static_assert look (and print) prettier |
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119 | template<typename core_t, typename node_t> |
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120 | struct is_valid_previsit { |
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121 | using ret_t = decltype( ((core_t*)nullptr)->previsit( (const node_t *)nullptr ) ); |
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122 | |
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123 | static constexpr bool value = std::is_void< ret_t >::value || |
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124 | std::is_base_of<const node_t, typename std::remove_pointer<ret_t>::type >::value; |
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125 | }; |
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126 | |
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127 | /// Used by previsit implementation |
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128 | /// We need to reassign the result to 'node', unless the function |
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129 | /// returns void, then we just leave 'node' unchanged |
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130 | template<bool is_void> |
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131 | struct __assign; |
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132 | |
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133 | template<> |
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134 | struct __assign<true> { |
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135 | template<typename core_t, typename node_t> |
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136 | static inline void result( core_t & core, const node_t * & node ) { |
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137 | core.previsit( node ); |
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138 | } |
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139 | }; |
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140 | |
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141 | template<> |
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142 | struct __assign<false> { |
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143 | template<typename core_t, typename node_t> |
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144 | static inline void result( core_t & core, const node_t * & node ) { |
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145 | node = core.previsit( node ); |
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146 | assertf(node, "Previsit must not return NULL"); |
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147 | } |
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148 | }; |
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149 | |
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150 | /// Used by postvisit implementation |
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151 | /// We need to return the result unless the function |
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152 | /// returns void, then we just return the original node |
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153 | template<bool is_void> |
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154 | struct __return; |
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155 | |
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156 | template<> |
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157 | struct __return<true> { |
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158 | template<typename core_t, typename node_t> |
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159 | static inline const node_t * result( core_t & core, const node_t * & node ) { |
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160 | core.postvisit( node ); |
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161 | return node; |
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162 | } |
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163 | }; |
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164 | |
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165 | template<> |
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166 | struct __return<false> { |
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167 | template<typename core_t, typename node_t> |
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168 | static inline auto result( core_t & core, const node_t * & node ) { |
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169 | return core.postvisit( node ); |
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170 | } |
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171 | }; |
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172 | |
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173 | //------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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174 | // Deep magic (a.k.a template meta programming) to make the templated visitor work |
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175 | // Basically the goal is to make 2 previsit |
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176 | // 1 - Use when a pass implements a valid previsit. This uses overloading which means the any overload of |
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177 | // 'pass.previsit( node )' that compiles will be used for that node for that type |
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178 | // This requires that this option only compile for passes that actually define an appropriate visit. |
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179 | // SFINAE will make sure the compilation errors in this function don't halt the build. |
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180 | // See http://en.cppreference.com/w/cpp/language/sfinae for details on SFINAE |
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181 | // 2 - Since the first implementation might not be specilizable, the second implementation exists and does nothing. |
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182 | // This is needed only to eliminate the need for passes to specify any kind of handlers. |
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183 | // The second implementation only works because it has a lower priority. This is due to the bogus last parameter. |
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184 | // The second implementation takes a long while the first takes an int. Since the caller always passes an literal 0 |
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185 | // the first implementation takes priority in regards to overloading. |
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186 | //------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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187 | // PreVisit : may mutate the pointer passed in if the node is mutated in the previsit call |
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188 | template<typename core_t, typename node_t> |
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189 | static inline auto previsit( core_t & core, const node_t * & node, int ) -> decltype( core.previsit( node ), void() ) { |
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190 | static_assert( |
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191 | is_valid_previsit<core_t, node_t>::value, |
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192 | "Previsit may not change the type of the node. It must return its paremeter or void." |
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193 | ); |
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194 | |
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195 | __assign< |
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196 | std::is_void< |
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197 | decltype( core.previsit( node ) ) |
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198 | >::value |
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199 | >::result( core, node ); |
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200 | } |
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201 | |
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202 | template<typename core_t, typename node_t> |
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203 | static inline auto previsit( core_t &, const node_t *, long ) {} |
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204 | |
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205 | // PostVisit : never mutates the passed pointer but may return a different node |
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206 | template<typename core_t, typename node_t> |
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207 | static inline auto postvisit( core_t & core, const node_t * node, int ) -> |
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208 | decltype( core.postvisit( node ), node->accept( *(Visitor*)nullptr ) ) |
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209 | { |
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210 | return __return< |
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211 | std::is_void< |
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212 | decltype( core.postvisit( node ) ) |
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213 | >::value |
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214 | >::result( core, node ); |
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215 | } |
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216 | |
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217 | template<typename core_t, typename node_t> |
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218 | static inline const node_t * postvisit( core_t &, const node_t * node, long ) { return node; } |
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219 | |
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220 | //------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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221 | // Deep magic (a.k.a template meta programming) continued |
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222 | // To make the templated visitor be more expressive, we allow 'accessories' : classes/structs the implementation can inherit |
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223 | // from in order to get extra functionallity for example |
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224 | // class ErrorChecker : WithShortCircuiting { ... }; |
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225 | // Pass<ErrorChecker> checker; |
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226 | // this would define a pass that uses the templated visitor with the additionnal feature that it has short circuiting |
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227 | // Note that in all cases the accessories are not required but guarantee the requirements of the feature is matched |
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228 | //------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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229 | // For several accessories, the feature is enabled by detecting that a specific field is present |
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230 | // Use a macro the encapsulate the logic of detecting a particular field |
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231 | // The type is not strictly enforced but does match the accessory |
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232 | #define FIELD_PTR( name, default_type ) \ |
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233 | template< typename core_t > \ |
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234 | static inline auto name( core_t & core, int ) -> decltype( &core.name ) { return &core.name; } \ |
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235 | \ |
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236 | template< typename core_t > \ |
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237 | static inline default_type * name( core_t &, long ) { return nullptr; } |
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238 | |
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239 | // List of fields and their expected types |
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240 | FIELD_PTR( typeSubs, const ast::TypeSubstitution * ) |
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241 | FIELD_PTR( stmtsToAddBefore, std::list< ast::ptr< ast::Stmt > > ) |
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242 | FIELD_PTR( stmtsToAddAfter , std::list< ast::ptr< ast::Stmt > > ) |
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243 | FIELD_PTR( declsToAddBefore, std::list< ast::ptr< ast::Decl > > ) |
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244 | FIELD_PTR( declsToAddAfter , std::list< ast::ptr< ast::Decl > > ) |
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245 | FIELD_PTR( visit_children, __pass::bool_ref ) |
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246 | FIELD_PTR( at_cleanup, __pass::at_cleanup_t ) |
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247 | FIELD_PTR( visitor, ast::Pass<core_t> * const ) |
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248 | |
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249 | // Remove the macro to make sure we don't clash |
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250 | #undef FIELD_PTR |
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251 | |
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252 | template< typename core_t > |
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253 | static inline auto beginTrace(core_t &, int) -> decltype( core_t::traceId, void() ) { |
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254 | // Stats::Heap::stacktrace_push(core_t::traceId); |
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255 | } |
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256 | |
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257 | template< typename core_t > |
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258 | static inline auto endTrace(core_t &, int) -> decltype( core_t::traceId, void() ) { |
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259 | // Stats::Heap::stacktrace_pop(); |
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260 | } |
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261 | |
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262 | template< typename core_t > |
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263 | static void beginTrace(core_t &, long) {} |
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264 | |
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265 | template< typename core_t > |
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266 | static void endTrace(core_t &, long) {} |
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267 | |
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268 | // Allows visitor to handle an error on top-level declarations, and possibly suppress the error. |
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269 | // If onError() returns false, the error will be ignored. By default, it returns true. |
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270 | |
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271 | template< typename core_t > |
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272 | static bool on_error (core_t &, ptr<Decl> &, long) { return true; } |
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273 | |
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274 | template< typename core_t > |
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275 | static auto on_error (core_t & core, ptr<Decl> & decl, int) -> decltype(core.on_error(decl)) { |
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276 | return core.on_error(decl); |
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277 | } |
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278 | |
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279 | // Another feature of the templated visitor is that it calls beginScope()/endScope() for compound statement. |
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280 | // All passes which have such functions are assumed desire this behaviour |
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281 | // detect it using the same strategy |
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282 | namespace scope { |
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283 | template<typename core_t> |
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284 | static inline auto enter( core_t & core, int ) -> decltype( core.beginScope(), void() ) { |
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285 | core.beginScope(); |
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286 | } |
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287 | |
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288 | template<typename core_t> |
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289 | static inline void enter( core_t &, long ) {} |
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290 | |
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291 | template<typename core_t> |
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292 | static inline auto leave( core_t & core, int ) -> decltype( core.endScope(), void() ) { |
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293 | core.endScope(); |
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294 | } |
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295 | |
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296 | template<typename core_t> |
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297 | static inline void leave( core_t &, long ) {} |
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298 | } // namespace scope |
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299 | |
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300 | // Certain passes desire an up to date symbol table automatically |
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301 | // detect the presence of a member name `symtab` and call all the members appropriately |
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302 | namespace symtab { |
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303 | // Some simple scoping rules |
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304 | template<typename core_t> |
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305 | static inline auto enter( core_t & core, int ) -> decltype( core.symtab, void() ) { |
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306 | core.symtab.enterScope(); |
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307 | } |
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308 | |
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309 | template<typename core_t> |
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310 | static inline auto enter( core_t &, long ) {} |
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311 | |
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312 | template<typename core_t> |
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313 | static inline auto leave( core_t & core, int ) -> decltype( core.symtab, void() ) { |
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314 | core.symtab.leaveScope(); |
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315 | } |
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316 | |
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317 | template<typename core_t> |
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318 | static inline auto leave( core_t &, long ) {} |
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319 | |
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320 | // The symbol table has 2 kind of functions mostly, 1 argument and 2 arguments |
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321 | // Create macro to condense these common patterns |
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322 | #define SYMTAB_FUNC1( func, type ) \ |
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323 | template<typename core_t> \ |
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324 | static inline auto func( core_t & core, int, type arg ) -> decltype( core.symtab.func( arg ), void() ) {\ |
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325 | core.symtab.func( arg ); \ |
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326 | } \ |
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327 | \ |
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328 | template<typename core_t> \ |
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329 | static inline void func( core_t &, long, type ) {} |
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330 | |
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331 | #define SYMTAB_FUNC2( func, type1, type2 ) \ |
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332 | template<typename core_t> \ |
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333 | static inline auto func( core_t & core, int, type1 arg1, type2 arg2 ) -> decltype( core.symtab.func( arg1, arg2 ), void () ) {\ |
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334 | core.symtab.func( arg1, arg2 ); \ |
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335 | } \ |
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336 | \ |
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337 | template<typename core_t> \ |
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338 | static inline void func( core_t &, long, type1, type2 ) {} |
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339 | |
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340 | SYMTAB_FUNC1( addId , const DeclWithType * ); |
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341 | SYMTAB_FUNC1( addType , const NamedTypeDecl * ); |
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342 | SYMTAB_FUNC1( addStruct , const StructDecl * ); |
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343 | SYMTAB_FUNC1( addEnum , const EnumDecl * ); |
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344 | SYMTAB_FUNC1( addUnion , const UnionDecl * ); |
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345 | SYMTAB_FUNC1( addTrait , const TraitDecl * ); |
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346 | SYMTAB_FUNC2( addWith , const std::vector< ptr<Expr> > &, const Decl * ); |
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347 | |
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348 | // A few extra functions have more complicated behaviour, they are hand written |
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349 | template<typename core_t> |
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350 | static inline auto addStructFwd( core_t & core, int, const ast::StructDecl * decl ) -> decltype( core.symtab.addStruct( decl ), void() ) { |
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351 | ast::StructDecl * fwd = new ast::StructDecl( decl->location, decl->name ); |
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352 | fwd->params = decl->params; |
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353 | core.symtab.addStruct( fwd ); |
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354 | } |
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355 | |
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356 | template<typename core_t> |
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357 | static inline void addStructFwd( core_t &, long, const ast::StructDecl * ) {} |
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358 | |
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359 | template<typename core_t> |
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360 | static inline auto addUnionFwd( core_t & core, int, const ast::UnionDecl * decl ) -> decltype( core.symtab.addUnion( decl ), void() ) { |
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361 | UnionDecl * fwd = new UnionDecl( decl->location, decl->name ); |
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362 | fwd->params = decl->params; |
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363 | core.symtab.addUnion( fwd ); |
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364 | } |
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365 | |
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366 | template<typename core_t> |
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367 | static inline void addUnionFwd( core_t &, long, const ast::UnionDecl * ) {} |
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368 | |
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369 | template<typename core_t> |
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370 | static inline auto addStruct( core_t & core, int, const std::string & str ) -> decltype( core.symtab.addStruct( str ), void() ) { |
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371 | if ( ! core.symtab.lookupStruct( str ) ) { |
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372 | core.symtab.addStruct( str ); |
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373 | } |
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374 | } |
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375 | |
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376 | template<typename core_t> |
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377 | static inline void addStruct( core_t &, long, const std::string & ) {} |
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378 | |
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379 | template<typename core_t> |
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380 | static inline auto addUnion( core_t & core, int, const std::string & str ) -> decltype( core.symtab.addUnion( str ), void() ) { |
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381 | if ( ! core.symtab.lookupUnion( str ) ) { |
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382 | core.symtab.addUnion( str ); |
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383 | } |
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384 | } |
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385 | |
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386 | template<typename core_t> |
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387 | static inline void addUnion( core_t &, long, const std::string & ) {} |
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388 | |
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389 | #undef SYMTAB_FUNC1 |
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390 | #undef SYMTAB_FUNC2 |
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391 | } // namespace symtab |
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392 | |
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393 | // Some passes need to mutate TypeDecl and properly update their pointing TypeInstType. |
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394 | // Detect the presence of a member name `subs` and call all members appropriately |
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395 | namespace forall { |
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396 | // Some simple scoping rules |
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397 | template<typename core_t> |
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398 | static inline auto enter( core_t & core, int, const ast::FunctionType * type ) |
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399 | -> decltype( core.subs, void() ) { |
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400 | if ( ! type->forall.empty() ) core.subs.beginScope(); |
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401 | } |
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402 | |
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403 | template<typename core_t> |
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404 | static inline auto enter( core_t &, long, const ast::FunctionType * ) {} |
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405 | |
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406 | template<typename core_t> |
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407 | static inline auto leave( core_t & core, int, const ast::FunctionType * type ) |
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408 | -> decltype( core.subs, void() ) { |
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409 | if ( ! type->forall.empty() ) { core.subs.endScope(); } |
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410 | } |
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411 | |
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412 | template<typename core_t> |
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413 | static inline auto leave( core_t &, long, const ast::FunctionType * ) {} |
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414 | |
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415 | // Replaces a TypeInstType's base TypeDecl according to the table |
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416 | template<typename core_t> |
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417 | static inline auto replace( core_t & core, int, const ast::TypeInstType *& inst ) |
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418 | -> decltype( core.subs, void() ) { |
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419 | inst = ast::mutate_field( |
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420 | inst, &ast::TypeInstType::base, core.subs.replace( inst->base ) ); |
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421 | } |
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422 | |
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423 | template<typename core_t> |
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424 | static inline auto replace( core_t &, long, const ast::TypeInstType *& ) {} |
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425 | |
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426 | } // namespace forall |
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427 | |
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428 | template<typename core_t> |
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429 | static inline auto get_result( core_t & core, char ) -> decltype( core.result() ) { |
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430 | return core.result(); |
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431 | } |
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432 | |
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433 | template<typename core_t> |
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434 | static inline auto get_result( core_t & core, int ) -> decltype( core.result ) { |
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435 | return core.result; |
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436 | } |
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437 | |
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438 | template<typename core_t> |
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439 | static inline void get_result( core_t &, long ) {} |
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440 | } // namespace __pass |
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441 | } // namespace ast |
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