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.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 "AST/Pass.hpp" |
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18 | |
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19 | #include <functional> |
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20 | #include <list> |
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21 | #include <stack> |
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22 | |
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23 | #include "AST/Fwd.hpp" |
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24 | #include "AST/Node.hpp" |
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25 | |
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26 | #include "AST/Attribute.hpp" |
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27 | #include "AST/Decl.hpp" |
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28 | #include "AST/Expr.hpp" |
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29 | #include "AST/Init.hpp" |
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30 | #include "AST/Stmt.hpp" |
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31 | #include "AST/Type.hpp" |
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32 | |
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33 | #include "AST/Visitor.hpp" |
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34 | |
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35 | #include "AST/SymbolTable.hpp" |
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36 | |
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37 | // Private prelude header, needed for some of the magic tricks this class pulls off |
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38 | #include "AST/Pass.proto.hpp" |
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39 | |
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40 | namespace ast { |
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41 | //------------------------------------------------------------------------------------------------- |
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42 | // Templated visitor type |
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43 | // To use declare a Pass< YOUR VISITOR TYPE > |
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44 | // The visitor type should specify the previsit/postvisit for types that are desired. |
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45 | // Note: previsit/postvisit must be **public** members |
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46 | // |
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47 | // Several additional features are available through inheritance |
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48 | // | PureVisitor - makes the visitor pure, it never modifies nodes in place and always |
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49 | // clones nodes it needs to make changes to |
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50 | // | WithConstTypeSubstitution - provides polymorphic const TypeSubstitution * typeSubs for the |
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51 | // current expression |
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52 | // | WithStmtsToAdd - provides the ability to insert statements before or after the current |
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53 | // statement by adding new statements into stmtsToAddBefore or |
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54 | // stmtsToAddAfter respectively. |
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55 | // | WithDeclsToAdd - provides the ability to insert declarations before or after the |
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56 | // current declarations by adding new DeclStmt into declsToAddBefore or |
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57 | // declsToAddAfter respectively. |
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58 | // | WithShortCircuiting - provides the ability to skip visiting child nodes; set visit_children |
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59 | // to false in pre{visit,visit} to skip visiting children |
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60 | // | WithGuards - provides the ability to save/restore data like a LIFO stack; to save, |
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61 | // call GuardValue with the variable to save, the variable will |
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62 | // automatically be restored to its previous value after the |
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63 | // corresponding postvisit/postmutate teminates. |
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64 | // | WithVisitorRef - provides an pointer to the templated visitor wrapper |
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65 | // | WithSymbolTable - provides symbol table functionality |
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66 | // |
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67 | // Other Special Members: |
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68 | // | beginScope - A method with no parameters or return value, called each time the |
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69 | // visitor enters a block. |
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70 | // | endScope - A method with no parameters or return value, called each time the |
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71 | // visitor leaves a block. |
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72 | // | result - Either a method that takes no parameters or a field. If a method (or |
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73 | // callable field) get_result calls it, otherwise the value is returned. |
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74 | //------------------------------------------------------------------------------------------------- |
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75 | template< typename core_t > |
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76 | class Pass final : public ast::Visitor { |
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77 | public: |
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78 | using core_type = core_t; |
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79 | using type = Pass<core_t>; |
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80 | |
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81 | /// Forward any arguments to the pass constructor |
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82 | /// Propagate 'this' if necessary |
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83 | template< typename... Args > |
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84 | Pass( Args &&... args) |
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85 | : core( std::forward<Args>( args )... ) |
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86 | { |
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87 | // After the pass is constructed, check if it wants the have a pointer to the wrapping visitor |
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88 | type * const * visitor = __pass::visitor( core, 0 ); |
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89 | if ( visitor ) { |
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90 | *const_cast<type **>( visitor ) = this; |
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91 | } |
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92 | } |
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93 | |
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94 | virtual ~Pass() = default; |
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95 | |
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96 | /// Storage for the actual pass. |
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97 | core_t core; |
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98 | |
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99 | /// If the core defines a result, call it if possible, otherwise return it. |
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100 | inline auto get_result() -> decltype( __pass::result::get( core, '0' ) ) { |
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101 | return __pass::result::get( core, '0' ); |
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102 | } |
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103 | |
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104 | /// Construct and run a pass on a translation unit. |
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105 | template< typename... Args > |
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106 | static void run( TranslationUnit & decls, Args &&... args ) { |
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107 | Pass<core_t> visitor( std::forward<Args>( args )... ); |
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108 | accept_all( decls, visitor ); |
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109 | } |
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110 | |
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111 | /// Contruct and run a pass on a pointer to extract a value. |
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112 | template< typename node_type, typename... Args > |
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113 | static auto read( node_type const * node, Args&&... args ) { |
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114 | Pass<core_t> visitor( std::forward<Args>( args )... ); |
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115 | auto const * temp = node->accept( visitor ); |
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116 | assert( temp == node ); |
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117 | return visitor.get_result(); |
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118 | } |
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119 | |
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120 | /// Visit function declarations |
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121 | const ast::DeclWithType * visit( const ast::ObjectDecl * ) override final; |
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122 | const ast::DeclWithType * visit( const ast::FunctionDecl * ) override final; |
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123 | const ast::Decl * visit( const ast::StructDecl * ) override final; |
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124 | const ast::Decl * visit( const ast::UnionDecl * ) override final; |
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125 | const ast::Decl * visit( const ast::EnumDecl * ) override final; |
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126 | const ast::Decl * visit( const ast::TraitDecl * ) override final; |
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127 | const ast::Decl * visit( const ast::TypeDecl * ) override final; |
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128 | const ast::Decl * visit( const ast::TypedefDecl * ) override final; |
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129 | const ast::AsmDecl * visit( const ast::AsmDecl * ) override final; |
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130 | const ast::DirectiveDecl * visit( const ast::DirectiveDecl * ) override final; |
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131 | const ast::StaticAssertDecl * visit( const ast::StaticAssertDecl * ) override final; |
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132 | const ast::DeclWithType * visit( const ast::InlineMemberDecl * ) override final; |
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133 | const ast::CompoundStmt * visit( const ast::CompoundStmt * ) override final; |
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134 | const ast::Stmt * visit( const ast::ExprStmt * ) override final; |
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135 | const ast::Stmt * visit( const ast::AsmStmt * ) override final; |
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136 | const ast::Stmt * visit( const ast::DirectiveStmt * ) override final; |
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137 | const ast::Stmt * visit( const ast::IfStmt * ) override final; |
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138 | const ast::Stmt * visit( const ast::WhileDoStmt * ) override final; |
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139 | const ast::Stmt * visit( const ast::ForStmt * ) override final; |
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140 | const ast::Stmt * visit( const ast::SwitchStmt * ) override final; |
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141 | const ast::CaseClause * visit( const ast::CaseClause * ) override final; |
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142 | const ast::Stmt * visit( const ast::BranchStmt * ) override final; |
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143 | const ast::Stmt * visit( const ast::ReturnStmt * ) override final; |
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144 | const ast::Stmt * visit( const ast::ThrowStmt * ) override final; |
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145 | const ast::Stmt * visit( const ast::TryStmt * ) override final; |
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146 | const ast::CatchClause * visit( const ast::CatchClause * ) override final; |
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147 | const ast::FinallyClause * visit( const ast::FinallyClause * ) override final; |
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148 | const ast::Stmt * visit( const ast::SuspendStmt * ) override final; |
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149 | const ast::WhenClause * visit( const ast::WhenClause * ) override final; |
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150 | const ast::Stmt * visit( const ast::WaitForStmt * ) override final; |
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151 | const ast::WaitForClause * visit( const ast::WaitForClause * ) override final; |
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152 | const ast::Stmt * visit( const ast::WaitUntilStmt * ) override final; |
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153 | const ast::Decl * visit( const ast::WithStmt * ) override final; |
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154 | const ast::NullStmt * visit( const ast::NullStmt * ) override final; |
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155 | const ast::Stmt * visit( const ast::DeclStmt * ) override final; |
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156 | const ast::Stmt * visit( const ast::ImplicitCtorDtorStmt * ) override final; |
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157 | const ast::Stmt * visit( const ast::MutexStmt * ) override final; |
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158 | const ast::Stmt * visit( const ast::CorunStmt * ) override final; |
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159 | const ast::Stmt * visit( const ast::CoforStmt * ) override final; |
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160 | const ast::Expr * visit( const ast::ApplicationExpr * ) override final; |
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161 | const ast::Expr * visit( const ast::UntypedExpr * ) override final; |
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162 | const ast::Expr * visit( const ast::NameExpr * ) override final; |
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163 | const ast::Expr * visit( const ast::QualifiedNameExpr * ) override final; |
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164 | const ast::Expr * visit( const ast::AddressExpr * ) override final; |
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165 | const ast::Expr * visit( const ast::LabelAddressExpr * ) override final; |
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166 | const ast::Expr * visit( const ast::CastExpr * ) override final; |
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167 | const ast::Expr * visit( const ast::KeywordCastExpr * ) override final; |
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168 | const ast::Expr * visit( const ast::VirtualCastExpr * ) override final; |
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169 | const ast::Expr * visit( const ast::UntypedMemberExpr * ) override final; |
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170 | const ast::Expr * visit( const ast::MemberExpr * ) override final; |
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171 | const ast::Expr * visit( const ast::VariableExpr * ) override final; |
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172 | const ast::Expr * visit( const ast::ConstantExpr * ) override final; |
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173 | const ast::Expr * visit( const ast::SizeofExpr * ) override final; |
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174 | const ast::Expr * visit( const ast::AlignofExpr * ) override final; |
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175 | const ast::Expr * visit( const ast::UntypedOffsetofExpr * ) override final; |
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176 | const ast::Expr * visit( const ast::OffsetofExpr * ) override final; |
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177 | const ast::Expr * visit( const ast::OffsetPackExpr * ) override final; |
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178 | const ast::Expr * visit( const ast::LogicalExpr * ) override final; |
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179 | const ast::Expr * visit( const ast::ConditionalExpr * ) override final; |
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180 | const ast::Expr * visit( const ast::CommaExpr * ) override final; |
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181 | const ast::Expr * visit( const ast::TypeExpr * ) override final; |
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182 | const ast::Expr * visit( const ast::DimensionExpr * ) override final; |
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183 | const ast::Expr * visit( const ast::AsmExpr * ) override final; |
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184 | const ast::Expr * visit( const ast::ImplicitCopyCtorExpr * ) override final; |
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185 | const ast::Expr * visit( const ast::ConstructorExpr * ) override final; |
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186 | const ast::Expr * visit( const ast::CompoundLiteralExpr * ) override final; |
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187 | const ast::Expr * visit( const ast::RangeExpr * ) override final; |
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188 | const ast::Expr * visit( const ast::UntypedTupleExpr * ) override final; |
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189 | const ast::Expr * visit( const ast::TupleExpr * ) override final; |
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190 | const ast::Expr * visit( const ast::TupleIndexExpr * ) override final; |
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191 | const ast::Expr * visit( const ast::TupleAssignExpr * ) override final; |
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192 | const ast::Expr * visit( const ast::StmtExpr * ) override final; |
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193 | const ast::Expr * visit( const ast::UniqueExpr * ) override final; |
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194 | const ast::Expr * visit( const ast::UntypedInitExpr * ) override final; |
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195 | const ast::Expr * visit( const ast::InitExpr * ) override final; |
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196 | const ast::Expr * visit( const ast::DeletedExpr * ) override final; |
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197 | const ast::Expr * visit( const ast::DefaultArgExpr * ) override final; |
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198 | const ast::Expr * visit( const ast::GenericExpr * ) override final; |
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199 | const ast::Type * visit( const ast::VoidType * ) override final; |
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200 | const ast::Type * visit( const ast::BasicType * ) override final; |
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201 | const ast::Type * visit( const ast::PointerType * ) override final; |
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202 | const ast::Type * visit( const ast::ArrayType * ) override final; |
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203 | const ast::Type * visit( const ast::ReferenceType * ) override final; |
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204 | const ast::Type * visit( const ast::QualifiedType * ) override final; |
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205 | const ast::Type * visit( const ast::FunctionType * ) override final; |
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206 | const ast::Type * visit( const ast::StructInstType * ) override final; |
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207 | const ast::Type * visit( const ast::UnionInstType * ) override final; |
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208 | const ast::Type * visit( const ast::EnumInstType * ) override final; |
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209 | const ast::Type * visit( const ast::TraitInstType * ) override final; |
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210 | const ast::Type * visit( const ast::TypeInstType * ) override final; |
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211 | const ast::Type * visit( const ast::TupleType * ) override final; |
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212 | const ast::Type * visit( const ast::TypeofType * ) override final; |
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213 | const ast::Type * visit( const ast::VTableType * ) override final; |
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214 | const ast::Type * visit( const ast::VarArgsType * ) override final; |
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215 | const ast::Type * visit( const ast::ZeroType * ) override final; |
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216 | const ast::Type * visit( const ast::OneType * ) override final; |
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217 | const ast::Type * visit( const ast::GlobalScopeType * ) override final; |
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218 | const ast::Designation * visit( const ast::Designation * ) override final; |
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219 | const ast::Init * visit( const ast::SingleInit * ) override final; |
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220 | const ast::Init * visit( const ast::ListInit * ) override final; |
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221 | const ast::Init * visit( const ast::ConstructorInit * ) override final; |
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222 | const ast::Attribute * visit( const ast::Attribute * ) override final; |
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223 | const ast::TypeSubstitution * visit( const ast::TypeSubstitution * ) override final; |
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224 | |
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225 | template<typename core_type> |
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226 | friend void accept_all( std::list< ptr<Decl> > & decls, Pass<core_type>& visitor ); |
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227 | |
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228 | bool isInFunction() const { |
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229 | return inFunction; |
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230 | } |
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231 | |
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232 | private: |
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233 | |
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234 | bool __visit_children() { bool * ptr = __pass::visit_children(core, 0); return ptr ? *ptr : true; } |
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235 | |
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236 | private: |
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237 | |
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238 | /// The return type of the general call_accept function. |
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239 | template< typename node_t > |
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240 | using call_accept_result_t = __pass::result1< |
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241 | typename std::remove_pointer< typename std::result_of< |
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242 | decltype(&node_t::accept)(node_t*, type&) >::type >::type |
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243 | >; |
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244 | |
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245 | template< typename node_t > |
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246 | auto call_accept( const node_t * node ) -> call_accept_result_t<node_t>; |
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247 | |
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248 | // requests WithStmtsToAdd directly add to this statement, as if it is a compound. |
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249 | __pass::result1<ast::Stmt> call_accept_as_compound(const ast::Stmt *); |
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250 | |
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251 | // requests type environment to be updated (why is it implemented like this?) |
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252 | __pass::result1<ast::Expr> call_accept_top(const ast::Expr *); |
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253 | |
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254 | template< template <class...> class container_t > |
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255 | __pass::resultNstmt<container_t> call_accept( const container_t< ptr<Stmt> > & ); |
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256 | |
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257 | template< template <class...> class container_t, typename node_t > |
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258 | __pass::resultN< container_t, node_t > call_accept( const container_t< ptr<node_t> > & container ); |
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259 | |
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260 | public: |
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261 | /// Logic to call the accept and mutate the parent if needed, delegates call to accept |
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262 | template<typename node_t, typename parent_t, typename field_t> |
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263 | void maybe_accept(const node_t * &, field_t parent_t::* field); |
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264 | |
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265 | template<typename node_t, typename parent_t, typename field_t> |
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266 | void maybe_accept_as_compound(const node_t * &, field_t parent_t::* field); |
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267 | |
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268 | template<typename node_t, typename parent_t, typename field_t> |
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269 | void maybe_accept_top(const node_t * &, field_t parent_t::* field); |
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270 | |
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271 | private: |
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272 | /// Internal RAII guard for symbol table features |
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273 | struct guard_symtab { |
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274 | guard_symtab( Pass<core_t> & pass ): pass( pass ) { __pass::symtab::enter(pass.core, 0); } |
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275 | ~guard_symtab() { __pass::symtab::leave(pass.core, 0); } |
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276 | Pass<core_t> & pass; |
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277 | }; |
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278 | |
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279 | /// Internal RAII guard for scope features |
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280 | struct guard_scope { |
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281 | guard_scope( Pass<core_t> & pass ): pass( pass ) { __pass::scope::enter(pass.core, 0); } |
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282 | ~guard_scope() { __pass::scope::leave(pass.core, 0); } |
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283 | Pass<core_t> & pass; |
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284 | }; |
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285 | |
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286 | /// Internal RAII guard for forall substitutions |
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287 | struct guard_forall_subs { |
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288 | guard_forall_subs( Pass<core_t> & pass, const FunctionType * type ) |
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289 | : pass( pass ), type( type ) { __pass::forall::enter(pass.core, 0, type ); } |
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290 | ~guard_forall_subs() { __pass::forall::leave(pass.core, 0, type ); } |
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291 | Pass<core_t> & pass; |
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292 | const FunctionType * type; |
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293 | }; |
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294 | |
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295 | private: |
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296 | bool inFunction = false; |
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297 | bool atFunctionTop = false; |
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298 | }; |
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299 | |
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300 | /// Apply a pass to an entire translation unit |
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301 | template<typename core_t> |
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302 | void accept_all( std::list< ast::ptr<ast::Decl> > &, ast::Pass<core_t> & visitor ); |
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303 | |
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304 | template<typename core_t> |
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305 | void accept_all( ast::TranslationUnit &, ast::Pass<core_t> & visitor ); |
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306 | |
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307 | //------------------------------------------------------------------------------------------------- |
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308 | // PASS ACCESSORIES |
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309 | //------------------------------------------------------------------------------------------------- |
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310 | |
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311 | /// If used the visitor will always clone nodes. |
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312 | struct PureVisitor {}; |
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313 | |
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314 | /// Keep track of the nearest parent node's location field. |
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315 | struct WithCodeLocation { |
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316 | const CodeLocation * location = nullptr; |
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317 | }; |
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318 | |
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319 | /// Keep track of the polymorphic const TypeSubstitution * typeSubs for the current expression. |
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320 | struct WithConstTypeSubstitution { |
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321 | const TypeSubstitution * typeSubs = nullptr; |
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322 | }; |
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323 | |
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324 | /// Used if visitor requires added statements before or after the current node. |
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325 | /// The Pass template handles what *before* and *after* means automatically |
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326 | template< template<class...> class container_t = std::list > |
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327 | struct WithStmtsToAdd { |
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328 | container_t< ptr<Stmt> > stmtsToAddBefore; |
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329 | container_t< ptr<Stmt> > stmtsToAddAfter; |
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330 | }; |
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331 | |
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332 | /// Used if visitor requires added declarations before or after the current node. |
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333 | /// The Pass template handles what *before* and *after* means automatically |
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334 | template< template<class...> class container_t = std::list > |
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335 | struct WithDeclsToAdd { |
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336 | container_t< ptr<Decl> > declsToAddBefore; |
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337 | container_t< ptr<Decl> > declsToAddAfter; |
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338 | }; |
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339 | |
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340 | /// Use if visitation should stop at certain levels |
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341 | /// set visit_children false of all child nodes should be ignored |
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342 | struct WithShortCircuiting { |
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343 | bool visit_children; |
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344 | }; |
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345 | |
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346 | /// Used to restore values/functions/etc. when the Pass finishes visiting this node |
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347 | class WithGuards { |
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348 | __pass::at_cleanup_t at_cleanup = [](__pass::cleanup_func_t, void*) { |
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349 | std::cerr << "No cleanup function was set" << std::endl; |
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350 | abort(); |
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351 | }; |
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352 | |
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353 | template< typename core_t> |
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354 | friend auto __pass::at_cleanup( core_t & core, int ) -> decltype( &core.at_cleanup ); |
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355 | public: |
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356 | |
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357 | /// When this node is finished being visited, restore the value of a variable |
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358 | /// You may assign to the return value to set the new value in the same statement. |
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359 | template< typename T > |
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360 | T& GuardValue( T& val ) { |
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361 | at_cleanup( [ val ]( void * newVal ) { |
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362 | * static_cast< T * >( newVal ) = val; |
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363 | }, static_cast< void * >( & val ) ); |
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364 | return val; |
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365 | } |
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366 | |
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367 | /// On the object, all beginScope now and endScope when the current node is finished being visited |
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368 | template< typename T > |
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369 | void GuardScope( T& val ) { |
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370 | val.beginScope(); |
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371 | at_cleanup( []( void * val ) { |
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372 | static_cast< T * >( val )->endScope(); |
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373 | }, static_cast< void * >( & val ) ); |
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374 | } |
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375 | |
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376 | /// When this node is finished being visited, call a function |
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377 | template< typename Func > |
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378 | void GuardAction( Func func ) { |
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379 | at_cleanup( [func](void *) { func(); }, nullptr ); |
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380 | } |
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381 | }; |
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382 | |
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383 | /// Used to get a pointer to the pass with its wrapped type |
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384 | template<typename core_t> |
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385 | struct WithVisitorRef { |
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386 | Pass<core_t> * const visitor = nullptr; |
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387 | |
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388 | bool isInFunction() const { |
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389 | return visitor->isInFunction(); |
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390 | } |
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391 | }; |
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392 | |
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393 | /// Use when the templated visitor should update the symbol table, |
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394 | /// that is, when your pass core needs to query the symbol table. |
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395 | /// Expected setups: |
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396 | /// - For master passes that kick off at the compilation unit |
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397 | /// - before resolver: extend WithSymbolTableX<IgnoreErrors> |
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398 | /// - after resolver: extend WithSymbolTable and use defaults |
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399 | /// - (FYI, for completeness, the resolver's main pass uses ValidateOnAdd when it kicks off) |
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400 | /// - For helper passes that kick off at arbitrary points in the AST: |
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401 | /// - take an existing symbol table as a parameter, extend WithSymbolTable, |
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402 | /// and construct with WithSymbolTable(const SymbolTable &) |
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403 | struct WithSymbolTable { |
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404 | WithSymbolTable(const ast::SymbolTable & from) : symtab(from) {} |
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405 | WithSymbolTable(ast::SymbolTable::ErrorDetection errorMode = ast::SymbolTable::ErrorDetection::AssertClean) : symtab(errorMode) {} |
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406 | ast::SymbolTable symtab; |
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407 | }; |
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408 | template <ast::SymbolTable::ErrorDetection errorMode> |
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409 | struct WithSymbolTableX : WithSymbolTable { |
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410 | WithSymbolTableX() : WithSymbolTable(errorMode) {} |
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411 | }; |
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412 | |
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413 | /// Used to get a pointer to the wrapping TranslationUnit. |
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414 | struct WithConstTranslationUnit { |
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415 | const TranslationUnit * translationUnit = nullptr; |
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416 | |
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417 | const TranslationUnit & transUnit() const { |
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418 | assertf( translationUnit, "WithConstTranslationUnit not set-up." ); |
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419 | return *translationUnit; |
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420 | } |
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421 | }; |
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422 | |
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423 | } |
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424 | |
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425 | #include "Common/Stats.h" |
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426 | |
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427 | namespace ast { |
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428 | extern struct PassVisitorStats { |
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429 | size_t depth = 0; |
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430 | Stats::Counters::MaxCounter<double> * max; |
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431 | Stats::Counters::AverageCounter<double> * avg; |
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432 | } pass_visitor_stats; |
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433 | } |
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434 | |
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435 | #include "AST/Pass.impl.hpp" |
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