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 | // Waitfor.cc -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Mon Aug 28 11:06:52 2017 |
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11 | // Last Modified By : |
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12 | // Last Modified On : |
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13 | // Update Count : 5 |
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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 <cassert> // for assert |
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19 | #include <string> // for string, operator== |
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20 | |
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21 | using namespace std::string_literals; |
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22 | |
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23 | #include "Common/PassVisitor.h" // for PassVisitor |
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24 | #include "Common/SemanticError.h" // for SemanticError |
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25 | #include "Common/utility.h" // for deleteAll, map_range |
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26 | #include "CodeGen/OperatorTable.h" // for isConstructor |
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27 | #include "InitTweak/InitTweak.h" // for getPointerBase |
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28 | #include "Parser/LinkageSpec.h" // for Cforall |
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29 | #include "ResolvExpr/Resolver.h" // for findVoidExpression |
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30 | #include "SynTree/Constant.h" // for Constant |
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31 | #include "SynTree/Declaration.h" // for StructDecl, FunctionDecl, ObjectDecl |
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32 | #include "SynTree/Expression.h" // for VariableExpr, ConstantExpr, Untype... |
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33 | #include "SynTree/Initializer.h" // for SingleInit, ListInit, Initializer ... |
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34 | #include "SynTree/Label.h" // for Label |
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35 | #include "SynTree/Statement.h" // for CompoundStmt, DeclStmt, ExprStmt |
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36 | #include "SynTree/Type.h" // for StructInstType, Type, PointerType |
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37 | #include "SynTree/Visitor.h" // for Visitor, acceptAll |
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38 | |
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39 | class Attribute; |
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40 | /* |
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41 | void foo() { |
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42 | while( true ) { |
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43 | when( a < 1 ) waitfor( f, a ) { bar(); } |
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44 | or timeout( swagl() ); |
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45 | or waitfor( g, a ) { baz(); } |
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46 | or waitfor( ^?{}, a ) { break; } |
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47 | or waitfor( ^?{} ) { break; } |
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48 | } |
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49 | } |
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50 | |
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51 | void f(int i, float f, A & mutex b, struct foo * ); |
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52 | void f(int ); |
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53 | |
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54 | |
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55 | | | |
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56 | | | |
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57 | | | |
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58 | | | |
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59 | | | |
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60 | \ | | / |
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61 | \ / |
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62 | \ / |
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63 | \/ |
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64 | |
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65 | |
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66 | void foo() { |
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67 | while( true ) { |
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68 | |
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69 | acceptable_t acceptables[3]; |
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70 | if( a < 1 ) { |
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71 | acceptables[0].func = f; |
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72 | acceptables[0].mon = a; |
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73 | } |
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74 | acceptables[1].func = g; |
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75 | acceptables[1].mon = a; |
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76 | |
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77 | acceptables[2].func = f; |
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78 | acceptables[2].mon = a; |
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79 | acceptables[2].is_dtor = true; |
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80 | |
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81 | int ret = waitfor_internal( acceptables, swagl() ); |
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82 | |
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83 | switch( ret ) { |
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84 | case 0: |
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85 | { |
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86 | bar(); |
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87 | } |
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88 | case 1: |
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89 | { |
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90 | baz(); |
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91 | } |
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92 | case 2: |
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93 | signal(a); |
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94 | { |
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95 | break; |
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96 | } |
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97 | } |
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98 | } |
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99 | }*/ |
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100 | |
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101 | namespace Concurrency { |
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102 | |
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103 | namespace { |
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104 | const std::list<Label> noLabels; |
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105 | const std::list< Attribute * > noAttributes; |
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106 | Type::StorageClasses noStorage; |
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107 | Type::Qualifiers noQualifiers; |
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108 | } |
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109 | |
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110 | //============================================================================================= |
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111 | // Pass declarations |
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112 | //============================================================================================= |
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113 | |
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114 | class GenerateWaitForPass final : public WithIndexer { |
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115 | public: |
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116 | |
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117 | void premutate( FunctionDecl * decl ); |
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118 | void premutate( StructDecl * decl ); |
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119 | |
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120 | Statement * postmutate( WaitForStmt * stmt ); |
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121 | |
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122 | static void generate( std::list< Declaration * > & translationUnit ) { |
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123 | PassVisitor< GenerateWaitForPass > impl; |
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124 | acceptAll( translationUnit, impl ); |
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125 | } |
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126 | |
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127 | ObjectDecl * declare( unsigned long count, CompoundStmt * stmt ); |
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128 | ObjectDecl * declareFlag( CompoundStmt * stmt ); |
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129 | Statement * makeSetter( ObjectDecl * flag ); |
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130 | ObjectDecl * declMon( WaitForStmt::Clause & clause, CompoundStmt * stmt ); |
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131 | void init( ObjectDecl * acceptables, int index, WaitForStmt::Clause & clause, Statement * settter, CompoundStmt * stmt ); |
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132 | Expression * init_timeout( Expression *& time, Expression *& time_cond, bool has_else, Expression *& else_cond, Statement * settter, CompoundStmt * stmt ); |
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133 | Expression * call(size_t count, ObjectDecl * acceptables, Expression * timeout, CompoundStmt * stmt); |
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134 | void choose( WaitForStmt * waitfor, Expression * result, CompoundStmt * stmt ); |
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135 | |
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136 | static void implement( std::list< Declaration * > & translationUnit ) { |
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137 | PassVisitor< GenerateWaitForPass > impl; |
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138 | mutateAll( translationUnit, impl ); |
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139 | } |
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140 | |
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141 | |
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142 | private: |
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143 | FunctionDecl * decl_waitfor = nullptr; |
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144 | StructDecl * decl_mask = nullptr; |
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145 | StructDecl * decl_acceptable = nullptr; |
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146 | StructDecl * decl_monitor = nullptr; |
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147 | |
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148 | static std::unique_ptr< Type > generic_func; |
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149 | |
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150 | UniqueName namer_acc = "__acceptables_"s; |
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151 | UniqueName namer_idx = "__index_"s; |
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152 | UniqueName namer_flg = "__do_run_"s; |
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153 | UniqueName namer_msk = "__mask_"s; |
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154 | UniqueName namer_mon = "__monitors_"s; |
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155 | UniqueName namer_tim = "__timeout_"s; |
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156 | }; |
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157 | |
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158 | //============================================================================================= |
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159 | // General entry routine |
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160 | //============================================================================================= |
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161 | void generateWaitFor( std::list< Declaration * > & translationUnit ) { |
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162 | GenerateWaitForPass ::implement( translationUnit ); |
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163 | } |
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164 | |
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165 | //============================================================================================= |
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166 | // Generic helper routine |
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167 | //============================================================================================= |
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168 | |
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169 | namespace { |
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170 | Expression * makeOpIndex( DeclarationWithType * array, unsigned long index ) { |
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171 | return new UntypedExpr( |
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172 | new NameExpr( "?[?]" ), |
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173 | { |
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174 | new VariableExpr( array ), |
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175 | new ConstantExpr( Constant::from_ulong( index ) ) |
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176 | } |
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177 | ); |
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178 | } |
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179 | |
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180 | Expression * makeOpAssign( Expression * lhs, Expression * rhs ) { |
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181 | return new UntypedExpr( |
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182 | new NameExpr( "?=?" ), |
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183 | { lhs, rhs } |
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184 | ); |
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185 | } |
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186 | |
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187 | Expression * makeOpMember( Expression * sue, const std::string & mem ) { |
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188 | return new UntypedMemberExpr( new NameExpr( mem ), sue ); |
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189 | } |
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190 | |
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191 | Statement * makeAccStatement( DeclarationWithType * object, unsigned long index, const std::string & member, Expression * value, const SymTab::Indexer & indexer ) { |
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192 | Expression * expr = makeOpAssign( |
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193 | makeOpMember( |
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194 | makeOpIndex( |
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195 | object, |
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196 | index |
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197 | ), |
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198 | member |
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199 | ), |
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200 | value |
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201 | ); |
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202 | |
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203 | ResolvExpr::findVoidExpression( expr, indexer ); |
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204 | |
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205 | return new ExprStmt( noLabels, expr ); |
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206 | } |
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207 | |
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208 | Expression * safeCond( Expression * expr, bool ifnull = true ) { |
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209 | if( expr ) return expr; |
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210 | |
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211 | return new ConstantExpr( Constant::from_bool( ifnull ) ); |
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212 | } |
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213 | |
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214 | VariableExpr * extractVariable( Expression * func ) { |
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215 | if( VariableExpr * var = dynamic_cast< VariableExpr * >( func ) ) { |
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216 | return var; |
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217 | } |
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218 | |
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219 | CastExpr * cast = strict_dynamic_cast< CastExpr * >( func ); |
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220 | return strict_dynamic_cast< VariableExpr * >( cast->arg ); |
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221 | } |
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222 | |
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223 | Expression * detectIsDtor( Expression * func ) { |
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224 | VariableExpr * typed_func = extractVariable( func ); |
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225 | bool is_dtor = InitTweak::isDestructor( typed_func->var ); |
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226 | return new ConstantExpr( Constant::from_bool( is_dtor ) ); |
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227 | } |
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228 | }; |
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229 | |
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230 | |
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231 | //============================================================================================= |
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232 | // Generate waitfor implementation |
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233 | //============================================================================================= |
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234 | |
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235 | void GenerateWaitForPass::premutate( FunctionDecl * decl) { |
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236 | if( decl->name != "__waitfor_internal" ) return; |
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237 | |
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238 | decl_waitfor = decl; |
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239 | } |
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240 | |
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241 | void GenerateWaitForPass::premutate( StructDecl * decl ) { |
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242 | if( ! decl->body ) return; |
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243 | |
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244 | if( decl->name == "__acceptable_t" ) { |
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245 | assert( !decl_acceptable ); |
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246 | decl_acceptable = decl; |
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247 | } |
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248 | else if( decl->name == "__waitfor_mask_t" ) { |
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249 | assert( !decl_mask ); |
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250 | decl_mask = decl; |
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251 | } |
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252 | else if( decl->name == "monitor_desc" ) { |
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253 | assert( !decl_monitor ); |
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254 | decl_monitor = decl; |
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255 | } |
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256 | } |
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257 | |
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258 | Statement * GenerateWaitForPass::postmutate( WaitForStmt * waitfor ) { |
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259 | if( !decl_monitor || !decl_acceptable || !decl_mask ) throw SemanticError( "waitfor keyword requires monitors to be in scope, add #include <monitor>", waitfor ); |
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260 | |
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261 | CompoundStmt * stmt = new CompoundStmt( noLabels ); |
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262 | |
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263 | ObjectDecl * acceptables = declare( waitfor->clauses.size(), stmt ); |
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264 | ObjectDecl * flag = declareFlag( stmt ); |
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265 | Statement * setter = makeSetter( flag ); |
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266 | |
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267 | int index = 0; |
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268 | for( auto & clause : waitfor->clauses ) { |
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269 | init( acceptables, index, clause, setter, stmt ); |
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270 | |
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271 | index++; |
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272 | } |
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273 | |
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274 | Expression * timeout = init_timeout( |
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275 | waitfor->timeout.time, |
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276 | waitfor->timeout.condition, |
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277 | waitfor->orelse .statement, |
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278 | waitfor->orelse .condition, |
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279 | setter, |
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280 | stmt |
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281 | ); |
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282 | |
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283 | CompoundStmt * compound = new CompoundStmt( noLabels ); |
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284 | stmt->push_back( new IfStmt( |
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285 | noLabels, |
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286 | safeCond( new VariableExpr( flag ) ), |
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287 | compound, |
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288 | nullptr |
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289 | )); |
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290 | |
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291 | Expression * result = call( waitfor->clauses.size(), acceptables, timeout, compound ); |
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292 | |
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293 | choose( waitfor, result, compound ); |
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294 | |
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295 | return stmt; |
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296 | } |
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297 | |
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298 | ObjectDecl * GenerateWaitForPass::declare( unsigned long count, CompoundStmt * stmt ) |
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299 | { |
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300 | ObjectDecl * acceptables = ObjectDecl::newObject( |
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301 | namer_acc.newName(), |
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302 | new ArrayType( |
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303 | noQualifiers, |
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304 | new StructInstType( |
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305 | noQualifiers, |
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306 | decl_acceptable |
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307 | ), |
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308 | new ConstantExpr( Constant::from_ulong( count ) ), |
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309 | false, |
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310 | false |
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311 | ), |
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312 | nullptr |
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313 | ); |
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314 | |
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315 | stmt->push_back( new DeclStmt( noLabels, acceptables) ); |
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316 | |
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317 | Expression * set = new UntypedExpr( |
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318 | new NameExpr( "__builtin_memset" ), |
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319 | { |
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320 | new VariableExpr( acceptables ), |
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321 | new ConstantExpr( Constant::from_int( 0 ) ), |
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322 | new SizeofExpr( new VariableExpr( acceptables ) ) |
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323 | } |
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324 | ); |
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325 | |
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326 | ResolvExpr::findVoidExpression( set, indexer ); |
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327 | |
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328 | stmt->push_back( new ExprStmt( noLabels, set ) ); |
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329 | |
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330 | return acceptables; |
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331 | } |
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332 | |
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333 | ObjectDecl * GenerateWaitForPass::declareFlag( CompoundStmt * stmt ) { |
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334 | ObjectDecl * flag = ObjectDecl::newObject( |
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335 | namer_flg.newName(), |
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336 | new BasicType( |
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337 | noQualifiers, |
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338 | BasicType::Bool |
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339 | ), |
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340 | new SingleInit( new ConstantExpr( Constant::from_ulong( 0 ) ) ) |
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341 | ); |
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342 | |
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343 | stmt->push_back( new DeclStmt( noLabels, flag) ); |
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344 | |
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345 | return flag; |
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346 | } |
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347 | |
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348 | Statement * GenerateWaitForPass::makeSetter( ObjectDecl * flag ) { |
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349 | Expression * expr = new UntypedExpr( |
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350 | new NameExpr( "?=?" ), |
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351 | { |
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352 | new VariableExpr( flag ), |
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353 | new ConstantExpr( Constant::from_ulong( 1 ) ) |
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354 | } |
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355 | ); |
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356 | |
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357 | ResolvExpr::findVoidExpression( expr, indexer ); |
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358 | |
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359 | return new ExprStmt( noLabels, expr ); |
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360 | } |
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361 | |
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362 | ObjectDecl * GenerateWaitForPass::declMon( WaitForStmt::Clause & clause, CompoundStmt * stmt ) { |
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363 | |
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364 | ObjectDecl * mon = ObjectDecl::newObject( |
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365 | namer_mon.newName(), |
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366 | new ArrayType( |
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367 | noQualifiers, |
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368 | new PointerType( |
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369 | noQualifiers, |
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370 | new StructInstType( |
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371 | noQualifiers, |
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372 | decl_monitor |
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373 | ) |
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374 | ), |
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375 | new ConstantExpr( Constant::from_ulong( clause.target.arguments.size() ) ), |
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376 | false, |
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377 | false |
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378 | ), |
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379 | new ListInit( |
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380 | map_range < std::list<Initializer*> > ( clause.target.arguments, [this](Expression * expr ){ |
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381 | Expression * init = new CastExpr( |
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382 | new UntypedExpr( |
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383 | new NameExpr( "get_monitor" ), |
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384 | { expr } |
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385 | ), |
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386 | new PointerType( |
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387 | noQualifiers, |
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388 | new StructInstType( |
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389 | noQualifiers, |
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390 | decl_monitor |
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391 | ) |
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392 | ) |
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393 | ); |
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394 | |
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395 | ResolvExpr::findSingleExpression( init, indexer ); |
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396 | return new SingleInit( init ); |
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397 | }) |
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398 | ) |
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399 | ); |
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400 | |
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401 | stmt->push_back( new DeclStmt( noLabels, mon) ); |
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402 | |
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403 | return mon; |
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404 | } |
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405 | |
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406 | void GenerateWaitForPass::init( ObjectDecl * acceptables, int index, WaitForStmt::Clause & clause, Statement * setter, CompoundStmt * stmt ) { |
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407 | |
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408 | ObjectDecl * monitors = declMon( clause, stmt ); |
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409 | |
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410 | Type * fptr_t = new PointerType( noQualifiers, new FunctionType( noQualifiers, true ) ); |
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411 | |
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412 | stmt->push_back( new IfStmt( |
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413 | noLabels, |
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414 | safeCond( clause.condition ), |
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415 | new CompoundStmt({ |
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416 | makeAccStatement( acceptables, index, "is_dtor", detectIsDtor( clause.target.function ) , indexer ), |
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417 | makeAccStatement( acceptables, index, "func" , new CastExpr( clause.target.function, fptr_t ) , indexer ), |
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418 | makeAccStatement( acceptables, index, "data" , new VariableExpr( monitors ) , indexer ), |
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419 | makeAccStatement( acceptables, index, "size" , new ConstantExpr( Constant::from_ulong( clause.target.arguments.size() ) ), indexer ), |
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420 | setter->clone() |
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421 | }), |
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422 | nullptr |
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423 | )); |
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424 | |
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425 | clause.target.function = nullptr; |
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426 | clause.target.arguments.empty(); |
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427 | clause.condition = nullptr; |
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428 | } |
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429 | |
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430 | Expression * GenerateWaitForPass::init_timeout( |
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431 | Expression *& time, |
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432 | Expression *& time_cond, |
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433 | bool has_else, |
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434 | Expression *& else_cond, |
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435 | Statement * setter, |
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436 | CompoundStmt * stmt |
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437 | ) { |
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438 | ObjectDecl * timeout = ObjectDecl::newObject( |
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439 | namer_tim.newName(), |
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440 | new BasicType( |
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441 | noQualifiers, |
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442 | BasicType::LongLongUnsignedInt |
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443 | ), |
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444 | new SingleInit( |
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445 | new ConstantExpr( Constant::from_int( -1 ) ) |
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446 | ) |
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447 | ); |
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448 | |
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449 | stmt->push_back( new DeclStmt( noLabels, timeout ) ); |
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450 | |
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451 | if( time ) { |
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452 | stmt->push_back( new IfStmt( |
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453 | noLabels, |
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454 | safeCond( time_cond ), |
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455 | new CompoundStmt({ |
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456 | new ExprStmt( |
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457 | noLabels, |
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458 | makeOpAssign( |
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459 | new VariableExpr( timeout ), |
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460 | time |
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461 | ) |
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462 | ), |
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463 | setter->clone() |
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464 | }), |
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465 | nullptr |
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466 | )); |
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467 | |
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468 | time = time_cond = nullptr; |
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469 | } |
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470 | |
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471 | if( has_else ) { |
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472 | stmt->push_back( new IfStmt( |
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473 | noLabels, |
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474 | safeCond( else_cond ), |
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475 | new CompoundStmt({ |
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476 | new ExprStmt( |
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477 | noLabels, |
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478 | makeOpAssign( |
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479 | new VariableExpr( timeout ), |
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480 | new ConstantExpr( Constant::from_ulong( 0 ) ) |
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481 | ) |
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482 | ), |
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483 | setter->clone() |
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484 | }), |
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485 | nullptr |
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486 | )); |
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487 | |
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488 | else_cond = nullptr; |
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489 | } |
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490 | |
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491 | delete setter; |
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492 | |
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493 | return new VariableExpr( timeout ); |
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494 | } |
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495 | |
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496 | Expression * GenerateWaitForPass::call( |
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497 | size_t count, |
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498 | ObjectDecl * acceptables, |
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499 | Expression * timeout, |
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500 | CompoundStmt * stmt |
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501 | ) { |
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502 | ObjectDecl * index = ObjectDecl::newObject( |
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503 | namer_idx.newName(), |
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504 | new BasicType( |
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505 | noQualifiers, |
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506 | BasicType::ShortSignedInt |
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507 | ), |
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508 | new SingleInit( |
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509 | new ConstantExpr( Constant::from_int( -1 ) ) |
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510 | ) |
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511 | ); |
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512 | |
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513 | stmt->push_back( new DeclStmt( noLabels, index ) ); |
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514 | |
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515 | ObjectDecl * mask = ObjectDecl::newObject( |
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516 | namer_msk.newName(), |
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517 | new StructInstType( |
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518 | noQualifiers, |
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519 | decl_mask |
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520 | ), |
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521 | new ListInit({ |
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522 | new SingleInit( new AddressExpr( new VariableExpr( index ) ) ), |
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523 | new SingleInit( new VariableExpr( acceptables ) ), |
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524 | new SingleInit( new ConstantExpr( Constant::from_ulong( count ) ) ) |
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525 | }) |
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526 | ); |
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527 | |
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528 | stmt->push_back( new DeclStmt( noLabels, mask ) ); |
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529 | |
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530 | stmt->push_back( new ExprStmt( |
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531 | noLabels, |
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532 | new ApplicationExpr( |
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533 | VariableExpr::functionPointer( decl_waitfor ), |
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534 | { |
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535 | new CastExpr( |
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536 | new VariableExpr( mask ), |
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537 | new ReferenceType( |
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538 | noQualifiers, |
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539 | new StructInstType( |
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540 | noQualifiers, |
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541 | decl_mask |
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542 | ) |
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543 | ) |
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544 | ), |
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545 | timeout |
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546 | } |
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547 | ) |
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548 | )); |
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549 | |
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550 | return new VariableExpr( index ); |
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551 | } |
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552 | |
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553 | void GenerateWaitForPass::choose( |
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554 | WaitForStmt * waitfor, |
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555 | Expression * result, |
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556 | CompoundStmt * stmt |
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557 | ) { |
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558 | SwitchStmt * swtch = new SwitchStmt( |
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559 | noLabels, |
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560 | result, |
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561 | std::list<Statement *>() |
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562 | ); |
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563 | |
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564 | unsigned long i = 0; |
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565 | for( auto & clause : waitfor->clauses ) { |
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566 | swtch->statements.push_back( |
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567 | new CaseStmt( |
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568 | noLabels, |
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569 | new ConstantExpr( Constant::from_ulong( i++ ) ), |
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570 | { |
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571 | clause.statement, |
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572 | new BranchStmt( |
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573 | noLabels, |
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574 | "", |
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575 | BranchStmt::Break |
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576 | ) |
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577 | } |
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578 | ) |
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579 | ); |
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580 | } |
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581 | |
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582 | if(waitfor->timeout.statement) { |
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583 | swtch->statements.push_back( |
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584 | new CaseStmt( |
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585 | noLabels, |
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586 | new ConstantExpr( Constant::from_int( -2 ) ), |
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587 | { |
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588 | waitfor->timeout.statement, |
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589 | new BranchStmt( |
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590 | noLabels, |
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591 | "", |
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592 | BranchStmt::Break |
---|
593 | ) |
---|
594 | } |
---|
595 | ) |
---|
596 | ); |
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597 | } |
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598 | |
---|
599 | if(waitfor->orelse.statement) { |
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600 | swtch->statements.push_back( |
---|
601 | new CaseStmt( |
---|
602 | noLabels, |
---|
603 | new ConstantExpr( Constant::from_int( -1 ) ), |
---|
604 | { |
---|
605 | waitfor->orelse.statement, |
---|
606 | new BranchStmt( |
---|
607 | noLabels, |
---|
608 | "", |
---|
609 | BranchStmt::Break |
---|
610 | ) |
---|
611 | } |
---|
612 | ) |
---|
613 | ); |
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614 | } |
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615 | |
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616 | stmt->push_back( swtch ); |
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617 | } |
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618 | }; |
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619 | |
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620 | // Local Variables: // |
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621 | // mode: c // |
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622 | // tab-width: 4 // |
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623 | // End: // |
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