1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2016 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 | // KeywordsNew.cpp -- Implement concurrency constructs from their keywords. |
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8 | // |
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9 | // Author : Andrew Beach |
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10 | // Created On : Tue Nov 16 9:53:00 2021 |
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11 | // Last Modified By : Andrew Beach |
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12 | // Last Modified On : Tue Nov 30 11:04:00 2021 |
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13 | // Update Count : 0 |
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14 | // |
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15 | |
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16 | #include "Concurrency/Keywords.h" |
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17 | |
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18 | #include "AST/Copy.hpp" |
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19 | #include "AST/Decl.hpp" |
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20 | #include "AST/Pass.hpp" |
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21 | #include "AST/Stmt.hpp" |
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22 | #include "AST/TranslationUnit.hpp" |
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23 | #include "CodeGen/OperatorTable.h" |
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24 | #include "Common/utility.h" |
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25 | #include "InitTweak/InitTweak.h" |
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26 | |
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27 | namespace Concurrency { |
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28 | |
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29 | namespace { |
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30 | |
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31 | inline static bool isThread( const ast::DeclWithType * decl ) { |
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32 | auto baseType = decl->get_type()->stripDeclarator(); |
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33 | auto instType = dynamic_cast<const ast::StructInstType *>( baseType ); |
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34 | if ( nullptr == instType ) { return false; } |
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35 | return instType->base->is_thread(); |
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36 | } |
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37 | |
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38 | // -------------------------------------------------------------------------- |
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39 | struct MutexKeyword final { |
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40 | const ast::FunctionDecl * postvisit( const ast::FunctionDecl * decl ); |
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41 | void postvisit( const ast::StructDecl * decl ); |
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42 | const ast::Stmt * postvisit( const ast::MutexStmt * stmt ); |
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43 | |
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44 | std::vector<const ast::DeclWithType *> findMutexArgs( |
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45 | const ast::FunctionDecl * decl, bool & first ); |
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46 | void validate( const ast::DeclWithType * decl ); |
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47 | ast::CompoundStmt * addDtorStatements( const ast::FunctionDecl* func, const ast::CompoundStmt *, const std::vector<const ast::DeclWithType *> &); |
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48 | ast::CompoundStmt * addStatements( const ast::FunctionDecl* func, const ast::CompoundStmt *, const std::vector<const ast::DeclWithType *> &); |
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49 | ast::CompoundStmt * addStatements( const ast::CompoundStmt * body, const std::vector<ast::ptr<ast::Expr>> & args ); |
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50 | ast::CompoundStmt * addThreadDtorStatements( const ast::FunctionDecl* func, const ast::CompoundStmt * body, const std::vector<const ast::DeclWithType *> & args ); |
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51 | |
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52 | public: |
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53 | const ast::StructDecl * monitor_decl = nullptr; |
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54 | const ast::StructDecl * guard_decl = nullptr; |
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55 | const ast::StructDecl * dtor_guard_decl = nullptr; |
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56 | const ast::StructDecl * thread_guard_decl = nullptr; |
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57 | const ast::StructDecl * lock_guard_decl = nullptr; |
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58 | |
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59 | static ast::ptr<ast::Type> generic_func; |
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60 | }; |
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61 | |
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62 | const ast::FunctionDecl * MutexKeyword::postvisit( |
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63 | const ast::FunctionDecl * decl ) { |
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64 | bool is_first_argument_mutex = false; |
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65 | const std::vector<const ast::DeclWithType *> mutexArgs = |
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66 | findMutexArgs( decl, is_first_argument_mutex ); |
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67 | bool const isDtor = CodeGen::isDestructor( decl->name ); |
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68 | |
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69 | // Does this function have any mutex arguments that connect to monitors? |
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70 | if ( mutexArgs.empty() ) { |
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71 | // If this is the destructor for a monitor it must be mutex. |
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72 | if ( isDtor ) { |
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73 | // This reflects MutexKeyword::validate, but no error messages. |
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74 | const ast::Type * type = decl->type->params.front(); |
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75 | |
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76 | // If it's a copy, it's not a mutex. |
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77 | const ast::ReferenceType * refType = dynamic_cast<const ast::ReferenceType *>( type ); |
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78 | if ( nullptr == refType ) { |
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79 | return decl; |
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80 | } |
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81 | |
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82 | // If it is not pointing directly to a type, it's not a mutex. |
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83 | auto base = refType->base; |
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84 | if ( base.as<ast::ReferenceType>() ) return decl; |
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85 | if ( base.as<ast::PointerType>() ) return decl; |
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86 | |
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87 | // If it is not a struct, it's not a mutex. |
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88 | auto baseStruct = base.as<ast::StructInstType>(); |
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89 | if ( nullptr == baseStruct ) return decl; |
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90 | |
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91 | // If it is a monitor, then it is a monitor. |
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92 | if( baseStruct->base->is_monitor() || baseStruct->base->is_thread() ) { |
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93 | SemanticError( decl, "destructors for structures declared as \"monitor\" must use mutex parameters\n" ); |
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94 | } |
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95 | } |
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96 | return decl; |
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97 | } |
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98 | |
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99 | // Monitors can't be constructed with mutual exclusion. |
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100 | if ( CodeGen::isConstructor( decl->name ) && !is_first_argument_mutex ) { |
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101 | SemanticError( decl, "constructors cannot have mutex parameters" ); |
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102 | } |
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103 | |
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104 | // It makes no sense to have multiple mutex parameters for the destructor. |
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105 | if ( isDtor && mutexArgs.size() != 1 ) { |
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106 | SemanticError( decl, "destructors can only have 1 mutex argument" ); |
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107 | } |
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108 | |
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109 | // Make sure all the mutex arguments are monitors. |
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110 | for ( auto arg : mutexArgs ) { |
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111 | validate( arg ); |
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112 | } |
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113 | |
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114 | // Check to see if the body needs to be instrument the body. |
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115 | const ast::CompoundStmt * body = decl->stmts; |
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116 | if ( !body ) return decl; |
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117 | |
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118 | // Check to if the required headers have been seen. |
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119 | if ( !monitor_decl || !guard_decl || !dtor_guard_decl ) { |
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120 | SemanticError( decl, "mutex keyword requires monitors to be in scope, add #include <monitor.hfa>\n" ); |
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121 | } |
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122 | |
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123 | // Instrument the body. |
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124 | ast::CompoundStmt * newBody = nullptr; |
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125 | if ( isDtor && isThread( mutexArgs.front() ) ) { |
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126 | if ( !thread_guard_decl ) { |
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127 | SemanticError( decl, "thread destructor requires threads to be in scope, add #include <thread.hfa>\n" ); |
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128 | } |
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129 | newBody = addThreadDtorStatements( decl, body, mutexArgs ); |
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130 | } else if ( isDtor ) { |
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131 | newBody = addDtorStatements( decl, body, mutexArgs ); |
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132 | } else { |
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133 | newBody = addStatements( decl, body, mutexArgs ); |
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134 | } |
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135 | assert( newBody ); |
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136 | return ast::mutate_field( decl, &ast::FunctionDecl::stmts, newBody ); |
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137 | } |
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138 | |
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139 | void MutexKeyword::postvisit( const ast::StructDecl * decl ) { |
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140 | if ( !decl->body ) { |
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141 | return; |
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142 | } else if ( decl->name == "monitor$" ) { |
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143 | assert( !monitor_decl ); |
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144 | monitor_decl = decl; |
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145 | } else if ( decl->name == "monitor_guard_t" ) { |
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146 | assert( !guard_decl ); |
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147 | guard_decl = decl; |
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148 | } else if ( decl->name == "monitor_dtor_guard_t" ) { |
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149 | assert( !dtor_guard_decl ); |
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150 | dtor_guard_decl = decl; |
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151 | } else if ( decl->name == "thread_dtor_guard_t" ) { |
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152 | assert( !thread_guard_decl ); |
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153 | thread_guard_decl = decl; |
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154 | } else if ( decl->name == "__mutex_stmt_lock_guard" ) { |
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155 | assert( !lock_guard_decl ); |
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156 | lock_guard_decl = decl; |
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157 | } |
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158 | } |
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159 | |
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160 | const ast::Stmt * MutexKeyword::postvisit( const ast::MutexStmt * stmt ) { |
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161 | ast::CompoundStmt * body = |
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162 | new ast::CompoundStmt( stmt->location, { stmt->stmt } ); |
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163 | addStatements( body, stmt->mutexObjs ); |
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164 | return body; |
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165 | } |
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166 | |
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167 | std::vector<const ast::DeclWithType *> MutexKeyword::findMutexArgs( |
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168 | const ast::FunctionDecl * decl, bool & first ) { |
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169 | std::vector<const ast::DeclWithType *> mutexArgs; |
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170 | |
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171 | bool once = true; |
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172 | for ( auto arg : decl->params ) { |
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173 | const ast::Type * type = arg->get_type(); |
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174 | if ( !type->is_mutex() ) continue; |
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175 | |
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176 | if ( once ) { |
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177 | first = true; |
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178 | once = false; |
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179 | } |
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180 | |
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181 | mutexArgs.push_back( arg.get() ); |
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182 | } |
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183 | return mutexArgs; |
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184 | } |
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185 | |
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186 | void MutexKeyword::validate( const ast::DeclWithType * decl ) { |
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187 | const ast::Type * type = decl->get_type(); |
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188 | |
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189 | // If it's a copy, it's not a mutex. |
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190 | const ast::ReferenceType * refType = dynamic_cast<const ast::ReferenceType *>( type ); |
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191 | if ( nullptr == refType ) { |
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192 | SemanticError( decl, "Mutex argument must be of reference type " ); |
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193 | } |
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194 | |
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195 | // If it is not pointing directly to a type, it's not a mutex. |
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196 | auto base = refType->base; |
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197 | if ( base.as<ast::ReferenceType>() || base.as<ast::PointerType>() ) { |
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198 | SemanticError( decl, "Mutex argument have exactly one level of indirection " ); |
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199 | } |
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200 | |
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201 | // If it is not a struct, it's not a mutex. |
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202 | auto baseStruct = base.as<ast::StructInstType>(); |
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203 | if ( nullptr == baseStruct ) return; |
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204 | |
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205 | // Make sure that only the outer reference is mutex. |
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206 | if( baseStruct->is_mutex() ) { |
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207 | SemanticError( decl, "mutex keyword may only appear once per argument " ); |
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208 | } |
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209 | } |
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210 | |
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211 | ast::CompoundStmt * MutexKeyword::addDtorStatements( |
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212 | const ast::FunctionDecl* func, const ast::CompoundStmt * body, |
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213 | const std::vector<const ast::DeclWithType *> & args ) { |
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214 | ast::Type * argType = ast::shallowCopy( args.front()->get_type() ); |
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215 | argType->set_mutex( false ); |
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216 | |
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217 | ast::CompoundStmt * mutBody = ast::mutate( body ); |
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218 | |
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219 | // Generated code goes near the beginning of body: |
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220 | const CodeLocation & location = mutBody->location; |
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221 | |
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222 | const ast::ObjectDecl * monitor = new ast::ObjectDecl( |
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223 | location, |
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224 | "__monitor", |
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225 | new ast::PointerType( new ast::StructInstType( monitor_decl ) ), |
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226 | new ast::SingleInit( |
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227 | location, |
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228 | new ast::UntypedExpr( |
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229 | location, |
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230 | new ast::NameExpr( location, "get_monitor" ), |
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231 | { new ast::CastExpr( |
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232 | location, |
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233 | new ast::VariableExpr( location, args.front() ), |
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234 | argType, ast::ExplicitCast |
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235 | ) } |
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236 | ) |
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237 | ), |
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238 | ast::Storage::Classes(), |
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239 | ast::Linkage::Cforall |
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240 | ); |
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241 | |
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242 | assert( generic_func ); |
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243 | |
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244 | // In reverse order: |
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245 | // monitor_dtor_guard_t __guard = { __monitor, func, false }; |
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246 | mutBody->push_front( |
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247 | new ast::DeclStmt( location, new ast::ObjectDecl( |
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248 | location, |
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249 | "__guard", |
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250 | new ast::StructInstType( dtor_guard_decl ), |
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251 | new ast::ListInit( |
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252 | location, |
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253 | { |
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254 | new ast::SingleInit( location, |
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255 | new ast::AddressExpr( |
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256 | new ast::VariableExpr( location, monitor ) ) ), |
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257 | new ast::SingleInit( location, |
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258 | new ast::CastExpr( location, |
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259 | new ast::VariableExpr( location, func ), |
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260 | generic_func, |
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261 | ast::ExplicitCast ) ), |
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262 | new ast::SingleInit( location, |
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263 | ast::ConstantExpr::from_bool( location, false ) ), |
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264 | }, |
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265 | {}, |
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266 | ast::MaybeConstruct |
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267 | ), |
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268 | ast::Storage::Classes(), |
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269 | ast::Linkage::Cforall |
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270 | )) |
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271 | ); |
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272 | |
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273 | // monitor$ * __monitor = get_monitor(a); |
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274 | mutBody->push_front( new ast::DeclStmt( location, monitor ) ); |
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275 | |
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276 | return mutBody; |
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277 | } |
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278 | |
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279 | ast::CompoundStmt * MutexKeyword::addStatements( |
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280 | const ast::FunctionDecl* func, const ast::CompoundStmt * body, |
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281 | const std::vector<const ast::DeclWithType * > & args ) { |
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282 | ast::CompoundStmt * mutBody = ast::mutate( body ); |
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283 | |
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284 | // Code is generated near the beginning of the compound statement. |
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285 | const CodeLocation & location = mutBody->location; |
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286 | |
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287 | // Make pointer to the monitors. |
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288 | ast::ObjectDecl * monitors = new ast::ObjectDecl( |
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289 | location, |
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290 | "__monitors", |
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291 | new ast::ArrayType( |
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292 | new ast::PointerType( |
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293 | new ast::StructInstType( monitor_decl ) |
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294 | ), |
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295 | ast::ConstantExpr::from_ulong( location, args.size() ), |
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296 | ast::FixedLen, |
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297 | ast::DynamicDim |
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298 | ), |
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299 | new ast::ListInit( |
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300 | location, |
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301 | map_range<std::vector<ast::ptr<ast::Init>>>( |
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302 | args, |
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303 | []( const ast::DeclWithType * decl ) { |
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304 | return new ast::SingleInit( |
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305 | decl->location, |
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306 | new ast::UntypedExpr( |
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307 | decl->location, |
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308 | new ast::NameExpr( decl->location, "get_monitor" ), |
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309 | { |
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310 | new ast::CastExpr( |
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311 | decl->location, |
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312 | new ast::VariableExpr( decl->location, decl ), |
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313 | decl->get_type(), |
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314 | ast::ExplicitCast |
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315 | ) |
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316 | } |
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317 | ) |
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318 | ); |
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319 | } |
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320 | ) |
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321 | ), |
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322 | ast::Storage::Classes(), |
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323 | ast::Linkage::Cforall |
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324 | ); |
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325 | |
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326 | assert( generic_func ); |
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327 | |
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328 | // In Reverse Order: |
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329 | mutBody->push_front( |
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330 | new ast::DeclStmt( location, new ast::ObjectDecl( |
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331 | location, |
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332 | "__guard", |
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333 | new ast::StructInstType( guard_decl ), |
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334 | new ast::ListInit( |
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335 | location, |
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336 | { |
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337 | new ast::SingleInit( location, |
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338 | new ast::VariableExpr( location, monitors ) ), |
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339 | new ast::SingleInit( location, |
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340 | ast::ConstantExpr::from_ulong( location, args.size() ) ), |
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341 | new ast::SingleInit( location, new ast::CastExpr( |
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342 | location, |
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343 | new ast::VariableExpr( location, func ), |
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344 | generic_func, |
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345 | ast::ExplicitCast |
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346 | ) ), |
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347 | }, |
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348 | {}, |
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349 | ast::MaybeConstruct |
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350 | ), |
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351 | ast::Storage::Classes(), |
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352 | ast::Linkage::Cforall |
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353 | )) |
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354 | ); |
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355 | |
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356 | // monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) }; |
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357 | mutBody->push_front( new ast::DeclStmt( location, monitors ) ); |
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358 | |
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359 | return mutBody; |
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360 | } |
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361 | |
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362 | ast::CompoundStmt * MutexKeyword::addStatements( |
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363 | const ast::CompoundStmt * body, |
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364 | const std::vector<ast::ptr<ast::Expr>> & args ) { |
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365 | ast::CompoundStmt * mutBody = ast::mutate( body ); |
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366 | |
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367 | // Code is generated near the beginning of the compound statement. |
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368 | const CodeLocation & location = mutBody->location; |
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369 | |
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370 | // Make pointer to the monitors. |
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371 | ast::ObjectDecl * monitors = new ast::ObjectDecl( |
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372 | location, |
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373 | "__monitors", |
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374 | new ast::ArrayType( |
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375 | new ast::PointerType( |
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376 | new ast::TypeofType( |
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377 | new ast::UntypedExpr( |
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378 | location, |
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379 | new ast::NameExpr( location, "__get_type" ), |
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380 | { args.front() } |
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381 | ) |
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382 | ) |
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383 | ), |
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384 | ast::ConstantExpr::from_ulong( location, args.size() ), |
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385 | ast::FixedLen, |
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386 | ast::DynamicDim |
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387 | ), |
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388 | new ast::ListInit( |
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389 | location, |
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390 | map_range<std::vector<ast::ptr<ast::Init>>>( |
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391 | args, [](const ast::Expr * expr) { |
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392 | return new ast::SingleInit( |
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393 | expr->location, |
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394 | new ast::UntypedExpr( |
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395 | expr->location, |
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396 | new ast::NameExpr( expr->location, "__get_ptr" ), |
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397 | { expr } |
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398 | ) |
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399 | ); |
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400 | } |
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401 | ) |
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402 | ), |
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403 | ast::Storage::Classes(), |
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404 | ast::Linkage::Cforall |
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405 | ); |
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406 | |
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407 | ast::StructInstType * lock_guard_struct = |
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408 | new ast::StructInstType( lock_guard_decl ); |
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409 | ast::TypeExpr * lock_type_expr = new ast::TypeExpr( |
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410 | location, |
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411 | new ast::TypeofType( |
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412 | new ast::UntypedExpr( |
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413 | location, |
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414 | new ast::NameExpr( location, "__get_type" ), |
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415 | { args.front() } |
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416 | ) |
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417 | ) |
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418 | ); |
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419 | |
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420 | lock_guard_struct->params.push_back( lock_type_expr ); |
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421 | |
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422 | // In reverse order: |
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423 | // monitor_guard_t __guard = { __monitors, # }; |
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424 | mutBody->push_front( |
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425 | new ast::DeclStmt( |
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426 | location, |
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427 | new ast::ObjectDecl( |
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428 | location, |
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429 | "__guard", |
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430 | lock_guard_struct, |
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431 | new ast::ListInit( |
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432 | location, |
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433 | { |
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434 | new ast::SingleInit( |
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435 | location, |
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436 | new ast::VariableExpr( location, monitors ) ), |
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437 | new ast::SingleInit( |
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438 | location, |
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439 | ast::ConstantExpr::from_ulong( location, args.size() ) ), |
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440 | }, |
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441 | {}, |
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442 | ast::MaybeConstruct |
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443 | ), |
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444 | ast::Storage::Classes(), |
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445 | ast::Linkage::Cforall |
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446 | ) |
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447 | ) |
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448 | ); |
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449 | |
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450 | // monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) }; |
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451 | mutBody->push_front( new ast::DeclStmt( location, monitors ) ); |
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452 | |
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453 | return mutBody; |
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454 | } |
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455 | |
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456 | ast::CompoundStmt * MutexKeyword::addThreadDtorStatements( |
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457 | const ast::FunctionDecl*, const ast::CompoundStmt * body, |
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458 | const std::vector<const ast::DeclWithType * > & args ) { |
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459 | assert( args.size() == 1 ); |
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460 | const ast::DeclWithType * arg = args.front(); |
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461 | const ast::Type * argType = arg->get_type(); |
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462 | assert( argType->is_mutex() ); |
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463 | |
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464 | ast::CompoundStmt * mutBody = ast::mutate( body ); |
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465 | |
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466 | // The code is generated near the front of the body. |
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467 | const CodeLocation & location = mutBody->location; |
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468 | |
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469 | // thread_dtor_guard_t __guard = { this, intptr( 0 ) }; |
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470 | mutBody->push_front( new ast::DeclStmt( |
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471 | location, |
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472 | new ast::ObjectDecl( |
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473 | location, |
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474 | "__guard", |
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475 | new ast::StructInstType( thread_guard_decl ), |
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476 | new ast::ListInit( |
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477 | location, |
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478 | { |
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479 | new ast::SingleInit( location, |
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480 | new ast::CastExpr( location, |
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481 | new ast::VariableExpr( location, arg ), argType ) ), |
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482 | new ast::SingleInit( |
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483 | location, |
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484 | new ast::UntypedExpr( |
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485 | location, |
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486 | new ast::NameExpr( location, "intptr" ), { |
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487 | ast::ConstantExpr::from_int( location, 0 ), |
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488 | } |
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489 | ) ), |
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490 | }, |
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491 | {}, |
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492 | ast::MaybeConstruct |
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493 | ), |
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494 | ast::Storage::Classes(), |
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495 | ast::Linkage::Cforall |
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496 | ) |
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497 | )); |
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498 | |
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499 | return mutBody; |
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500 | } |
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501 | |
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502 | ast::ptr<ast::Type> MutexKeyword::generic_func = |
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503 | new ast::FunctionType( ast::VariableArgs ); |
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504 | |
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505 | // -------------------------------------------------------------------------- |
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506 | struct ThreadStarter final { |
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507 | void previsit( const ast::StructDecl * decl ); |
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508 | const ast::FunctionDecl * postvisit( const ast::FunctionDecl * decl ); |
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509 | |
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510 | private: |
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511 | bool thread_ctor_seen = false; |
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512 | const ast::StructDecl * thread_decl = nullptr; |
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513 | }; |
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514 | |
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515 | void ThreadStarter::previsit( const ast::StructDecl * decl ) { |
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516 | if ( decl->body && decl->name == "thread$" ) { |
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517 | assert( !thread_decl ); |
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518 | thread_decl = decl; |
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519 | } |
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520 | } |
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521 | |
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522 | const ast::FunctionDecl * ThreadStarter::postvisit( const ast::FunctionDecl * decl ) { |
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523 | if ( !CodeGen::isConstructor( decl->name ) ) return decl; |
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524 | |
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525 | // Seach for the thread constructor. |
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526 | // (Are the "prefixes" of these to blocks the same?) |
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527 | const ast::Type * typeof_this = InitTweak::getTypeofThis( decl->type ); |
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528 | auto ctored_type = dynamic_cast<const ast::StructInstType *>( typeof_this ); |
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529 | if ( ctored_type && ctored_type->base == thread_decl ) { |
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530 | thread_ctor_seen = true; |
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531 | } |
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532 | |
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533 | // Modify this declaration, the extra checks to see if we will are first. |
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534 | const ast::ptr<ast::DeclWithType> & param = decl->params.front(); |
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535 | auto type = dynamic_cast<const ast::StructInstType *>( |
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536 | InitTweak::getPointerBase( param->get_type() ) ); |
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537 | if ( nullptr == type ) return decl; |
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538 | if ( !type->base->is_thread() ) return decl; |
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539 | if ( !thread_decl || !thread_ctor_seen ) { |
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540 | SemanticError( type->base->location, "thread keyword requires threads to be in scope, add #include <thread.hfa>" ); |
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541 | } |
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542 | const ast::CompoundStmt * stmt = decl->stmts; |
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543 | if ( nullptr == stmt ) return decl; |
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544 | |
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545 | // Now do the actual modification: |
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546 | ast::CompoundStmt * mutStmt = ast::mutate( stmt ); |
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547 | const CodeLocation & location = mutStmt->location; |
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548 | mutStmt->push_back( |
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549 | new ast::ExprStmt( |
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550 | location, |
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551 | new ast::UntypedExpr( |
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552 | location, |
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553 | new ast::NameExpr( location, "__thrd_start" ), |
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554 | { |
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555 | new ast::VariableExpr( location, param ), |
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556 | new ast::NameExpr( location, "main" ), |
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557 | } |
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558 | ) |
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559 | ) |
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560 | ); |
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561 | |
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562 | return ast::mutate_field( decl, &ast::FunctionDecl::stmts, mutStmt ); |
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563 | } |
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564 | |
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565 | } // namespace |
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566 | |
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567 | // -------------------------------------------------------------------------- |
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568 | |
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569 | void implementKeywords( ast::TranslationUnit & translationUnit ) { |
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570 | (void)translationUnit; |
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571 | assertf(false, "Apply Keywords not implemented." ); |
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572 | } |
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573 | |
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574 | void implementMutex( ast::TranslationUnit & translationUnit ) { |
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575 | ast::Pass<MutexKeyword>::run( translationUnit ); |
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576 | } |
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577 | |
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578 | void implementThreadStarter( ast::TranslationUnit & translationUnit ) { |
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579 | ast::Pass<ThreadStarter>::run( translationUnit ); |
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580 | } |
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581 | |
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582 | } |
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583 | |
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584 | // Local Variables: // |
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585 | // tab-width: 4 // |
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586 | // mode: c++ // |
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587 | // compile-command: "make install" // |
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588 | // End: // |
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