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