1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2015 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 | // Validate.cc -- |
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8 | // |
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9 | // Author : Richard C. Bilson |
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10 | // Created On : Sun May 17 21:50:04 2015 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Mon Aug 28 13:47:23 2017 |
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13 | // Update Count : 359 |
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14 | // |
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15 | |
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16 | // The "validate" phase of translation is used to take a syntax tree and convert it into a standard form that aims to be |
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17 | // as regular in structure as possible. Some assumptions can be made regarding the state of the tree after this pass is |
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18 | // complete, including: |
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19 | // |
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20 | // - No nested structure or union definitions; any in the input are "hoisted" to the level of the containing struct or |
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21 | // union. |
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22 | // |
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23 | // - All enumeration constants have type EnumInstType. |
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24 | // |
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25 | // - The type "void" never occurs in lists of function parameter or return types. A function |
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26 | // taking no arguments has no argument types. |
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27 | // |
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28 | // - No context instances exist; they are all replaced by the set of declarations signified by the context, instantiated |
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29 | // by the particular set of type arguments. |
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30 | // |
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31 | // - Every declaration is assigned a unique id. |
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32 | // |
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33 | // - No typedef declarations or instances exist; the actual type is substituted for each instance. |
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34 | // |
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35 | // - Each type, struct, and union definition is followed by an appropriate assignment operator. |
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36 | // |
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37 | // - Each use of a struct or union is connected to a complete definition of that struct or union, even if that |
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38 | // definition occurs later in the input. |
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39 | |
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40 | #include "Validate.h" |
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41 | |
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42 | #include <cassert> // for assertf, assert |
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43 | #include <cstddef> // for size_t |
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44 | #include <list> // for list |
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45 | #include <string> // for string |
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46 | #include <utility> // for pair |
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47 | |
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48 | #include "CodeGen/CodeGenerator.h" // for genName |
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49 | #include "CodeGen/OperatorTable.h" // for isCtorDtor, isCtorDtorAssign |
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50 | #include "Common/PassVisitor.h" // for PassVisitor, WithDeclsToAdd |
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51 | #include "Common/ScopedMap.h" // for ScopedMap |
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52 | #include "Common/SemanticError.h" // for SemanticError |
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53 | #include "Common/UniqueName.h" // for UniqueName |
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54 | #include "Common/utility.h" // for operator+, cloneAll, deleteAll |
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55 | #include "Concurrency/Keywords.h" // for applyKeywords |
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56 | #include "FixFunction.h" // for FixFunction |
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57 | #include "Indexer.h" // for Indexer |
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58 | #include "InitTweak/GenInit.h" // for fixReturnStatements |
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59 | #include "InitTweak/InitTweak.h" // for isCtorDtorAssign |
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60 | #include "Parser/LinkageSpec.h" // for C |
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61 | #include "ResolvExpr/typeops.h" // for typesCompatible |
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62 | #include "SymTab/AddVisit.h" // for addVisit |
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63 | #include "SymTab/Autogen.h" // for SizeType |
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64 | #include "SynTree/Attribute.h" // for noAttributes, Attribute |
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65 | #include "SynTree/Constant.h" // for Constant |
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66 | #include "SynTree/Declaration.h" // for ObjectDecl, DeclarationWithType |
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67 | #include "SynTree/Expression.h" // for CompoundLiteralExpr, Expressio... |
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68 | #include "SynTree/Initializer.h" // for ListInit, Initializer |
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69 | #include "SynTree/Label.h" // for operator==, Label |
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70 | #include "SynTree/Mutator.h" // for Mutator |
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71 | #include "SynTree/Type.h" // for Type, TypeInstType, EnumInstType |
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72 | #include "SynTree/TypeSubstitution.h" // for TypeSubstitution |
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73 | #include "SynTree/Visitor.h" // for Visitor |
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74 | |
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75 | class CompoundStmt; |
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76 | class ReturnStmt; |
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77 | class SwitchStmt; |
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78 | |
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79 | |
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80 | #define debugPrint( x ) if ( doDebug ) { std::cout << x; } |
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81 | |
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82 | namespace SymTab { |
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83 | struct HoistStruct final : public WithDeclsToAdd, public WithGuards { |
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84 | /// Flattens nested struct types |
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85 | static void hoistStruct( std::list< Declaration * > &translationUnit ); |
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86 | |
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87 | void previsit( EnumInstType * enumInstType ); |
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88 | void previsit( StructInstType * structInstType ); |
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89 | void previsit( UnionInstType * unionInstType ); |
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90 | void previsit( StructDecl * aggregateDecl ); |
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91 | void previsit( UnionDecl * aggregateDecl ); |
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92 | |
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93 | private: |
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94 | template< typename AggDecl > void handleAggregate( AggDecl *aggregateDecl ); |
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95 | |
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96 | AggregateDecl * parentAggr = nullptr; |
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97 | }; |
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98 | |
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99 | /// Fix return types so that every function returns exactly one value |
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100 | struct ReturnTypeFixer { |
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101 | static void fix( std::list< Declaration * > &translationUnit ); |
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102 | |
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103 | void postvisit( FunctionDecl * functionDecl ); |
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104 | void postvisit( FunctionType * ftype ); |
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105 | }; |
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106 | |
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107 | /// Replaces enum types by int, and function or array types in function parameter and return lists by appropriate pointers. |
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108 | struct EnumAndPointerDecay { |
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109 | void previsit( EnumDecl *aggregateDecl ); |
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110 | void previsit( FunctionType *func ); |
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111 | }; |
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112 | |
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113 | /// Associates forward declarations of aggregates with their definitions |
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114 | struct LinkReferenceToTypes final : public WithIndexer, public WithGuards { |
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115 | LinkReferenceToTypes( const Indexer *indexer ); |
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116 | void postvisit( TypeInstType *typeInst ); |
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117 | |
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118 | void postvisit( EnumInstType *enumInst ); |
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119 | void postvisit( StructInstType *structInst ); |
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120 | void postvisit( UnionInstType *unionInst ); |
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121 | void postvisit( TraitInstType *traitInst ); |
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122 | |
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123 | void postvisit( EnumDecl *enumDecl ); |
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124 | void postvisit( StructDecl *structDecl ); |
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125 | void postvisit( UnionDecl *unionDecl ); |
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126 | void postvisit( TraitDecl * traitDecl ); |
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127 | |
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128 | void previsit( StructDecl *structDecl ); |
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129 | void previsit( UnionDecl *unionDecl ); |
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130 | |
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131 | void renameGenericParams( std::list< TypeDecl * > & params ); |
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132 | |
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133 | private: |
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134 | const Indexer *local_indexer; |
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135 | |
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136 | typedef std::map< std::string, std::list< EnumInstType * > > ForwardEnumsType; |
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137 | typedef std::map< std::string, std::list< StructInstType * > > ForwardStructsType; |
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138 | typedef std::map< std::string, std::list< UnionInstType * > > ForwardUnionsType; |
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139 | ForwardEnumsType forwardEnums; |
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140 | ForwardStructsType forwardStructs; |
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141 | ForwardUnionsType forwardUnions; |
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142 | /// true if currently in a generic type body, so that type parameter instances can be renamed appropriately |
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143 | bool inGeneric = false; |
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144 | }; |
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145 | |
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146 | /// Replaces array and function types in forall lists by appropriate pointer type and assigns each Object and Function declaration a unique ID. |
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147 | struct ForallPointerDecay final { |
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148 | void previsit( ObjectDecl * object ); |
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149 | void previsit( FunctionDecl * func ); |
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150 | void previsit( StructDecl * aggrDecl ); |
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151 | void previsit( UnionDecl * aggrDecl ); |
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152 | }; |
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153 | |
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154 | struct ReturnChecker : public WithGuards { |
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155 | /// Checks that return statements return nothing if their return type is void |
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156 | /// and return something if the return type is non-void. |
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157 | static void checkFunctionReturns( std::list< Declaration * > & translationUnit ); |
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158 | |
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159 | void previsit( FunctionDecl * functionDecl ); |
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160 | void previsit( ReturnStmt * returnStmt ); |
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161 | |
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162 | typedef std::list< DeclarationWithType * > ReturnVals; |
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163 | ReturnVals returnVals; |
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164 | }; |
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165 | |
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166 | struct EliminateTypedef final : public WithVisitorRef<EliminateTypedef>, public WithGuards { |
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167 | EliminateTypedef() : scopeLevel( 0 ) {} |
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168 | /// Replaces typedefs by forward declarations |
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169 | static void eliminateTypedef( std::list< Declaration * > &translationUnit ); |
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170 | |
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171 | Type * postmutate( TypeInstType * aggregateUseType ); |
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172 | Declaration * postmutate( TypedefDecl * typeDecl ); |
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173 | void premutate( TypeDecl * typeDecl ); |
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174 | void premutate( FunctionDecl * funcDecl ); |
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175 | void premutate( ObjectDecl * objDecl ); |
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176 | DeclarationWithType * postmutate( ObjectDecl * objDecl ); |
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177 | |
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178 | void premutate( CastExpr * castExpr ); |
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179 | |
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180 | void premutate( CompoundStmt * compoundStmt ); |
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181 | CompoundStmt * postmutate( CompoundStmt * compoundStmt ); |
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182 | |
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183 | void premutate( StructDecl * structDecl ); |
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184 | Declaration * postmutate( StructDecl * structDecl ); |
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185 | void premutate( UnionDecl * unionDecl ); |
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186 | Declaration * postmutate( UnionDecl * unionDecl ); |
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187 | void premutate( EnumDecl * enumDecl ); |
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188 | Declaration * postmutate( EnumDecl * enumDecl ); |
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189 | Declaration * postmutate( TraitDecl * contextDecl ); |
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190 | |
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191 | void premutate( FunctionType * ftype ); |
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192 | |
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193 | private: |
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194 | template<typename AggDecl> |
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195 | AggDecl *handleAggregate( AggDecl * aggDecl ); |
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196 | |
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197 | template<typename AggDecl> |
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198 | void addImplicitTypedef( AggDecl * aggDecl ); |
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199 | |
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200 | typedef std::unique_ptr<TypedefDecl> TypedefDeclPtr; |
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201 | typedef ScopedMap< std::string, std::pair< TypedefDeclPtr, int > > TypedefMap; |
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202 | typedef std::map< std::string, TypeDecl * > TypeDeclMap; |
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203 | TypedefMap typedefNames; |
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204 | TypeDeclMap typedeclNames; |
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205 | int scopeLevel; |
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206 | bool inFunctionType = false; |
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207 | }; |
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208 | |
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209 | struct VerifyCtorDtorAssign { |
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210 | /// ensure that constructors, destructors, and assignment have at least one |
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211 | /// parameter, the first of which must be a pointer, and that ctor/dtors have no |
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212 | /// return values. |
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213 | static void verify( std::list< Declaration * > &translationUnit ); |
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214 | |
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215 | void previsit( FunctionDecl *funcDecl ); |
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216 | }; |
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217 | |
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218 | /// ensure that generic types have the correct number of type arguments |
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219 | struct ValidateGenericParameters { |
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220 | void previsit( StructInstType * inst ); |
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221 | void previsit( UnionInstType * inst ); |
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222 | }; |
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223 | |
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224 | struct ArrayLength { |
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225 | /// for array types without an explicit length, compute the length and store it so that it |
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226 | /// is known to the rest of the phases. For example, |
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227 | /// int x[] = { 1, 2, 3 }; |
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228 | /// int y[][2] = { { 1, 2, 3 }, { 1, 2, 3 } }; |
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229 | /// here x and y are known at compile-time to have length 3, so change this into |
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230 | /// int x[3] = { 1, 2, 3 }; |
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231 | /// int y[3][2] = { { 1, 2, 3 }, { 1, 2, 3 } }; |
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232 | static void computeLength( std::list< Declaration * > & translationUnit ); |
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233 | |
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234 | void previsit( ObjectDecl * objDecl ); |
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235 | }; |
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236 | |
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237 | struct CompoundLiteral final : public WithDeclsToAdd, public WithVisitorRef<CompoundLiteral> { |
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238 | Type::StorageClasses storageClasses; |
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239 | |
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240 | void premutate( ObjectDecl *objectDecl ); |
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241 | Expression * postmutate( CompoundLiteralExpr *compLitExpr ); |
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242 | }; |
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243 | |
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244 | struct LabelAddressFixer final : public WithGuards { |
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245 | std::set< Label > labels; |
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246 | |
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247 | void premutate( FunctionDecl * funcDecl ); |
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248 | Expression * postmutate( AddressExpr * addrExpr ); |
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249 | }; |
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250 | |
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251 | FunctionDecl * dereferenceOperator = nullptr; |
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252 | struct FindSpecialDeclarations final { |
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253 | void previsit( FunctionDecl * funcDecl ); |
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254 | }; |
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255 | |
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256 | void validate( std::list< Declaration * > &translationUnit, __attribute__((unused)) bool doDebug ) { |
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257 | PassVisitor<EnumAndPointerDecay> epc; |
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258 | PassVisitor<LinkReferenceToTypes> lrt( nullptr ); |
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259 | PassVisitor<ForallPointerDecay> fpd; |
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260 | PassVisitor<CompoundLiteral> compoundliteral; |
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261 | PassVisitor<ValidateGenericParameters> genericParams; |
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262 | PassVisitor<FindSpecialDeclarations> finder; |
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263 | PassVisitor<LabelAddressFixer> labelAddrFixer; |
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264 | |
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265 | EliminateTypedef::eliminateTypedef( translationUnit ); |
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266 | HoistStruct::hoistStruct( translationUnit ); // must happen after EliminateTypedef, so that aggregate typedefs occur in the correct order |
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267 | ReturnTypeFixer::fix( translationUnit ); // must happen before autogen |
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268 | acceptAll( translationUnit, epc ); // must happen before VerifyCtorDtorAssign, because void return objects should not exist; before LinkReferenceToTypes because it is an indexer and needs correct types for mangling |
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269 | acceptAll( translationUnit, lrt ); // must happen before autogen, because sized flag needs to propagate to generated functions |
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270 | acceptAll( translationUnit, genericParams ); // check as early as possible - can't happen before LinkReferenceToTypes |
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271 | VerifyCtorDtorAssign::verify( translationUnit ); // must happen before autogen, because autogen examines existing ctor/dtors |
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272 | ReturnChecker::checkFunctionReturns( translationUnit ); |
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273 | InitTweak::fixReturnStatements( translationUnit ); // must happen before autogen |
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274 | Concurrency::applyKeywords( translationUnit ); |
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275 | acceptAll( translationUnit, fpd ); // must happen before autogenerateRoutines, after Concurrency::applyKeywords because uniqueIds must be set on declaration before resolution |
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276 | autogenerateRoutines( translationUnit ); // moved up, used to be below compoundLiteral - currently needs EnumAndPointerDecay |
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277 | Concurrency::implementMutexFuncs( translationUnit ); |
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278 | Concurrency::implementThreadStarter( translationUnit ); |
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279 | mutateAll( translationUnit, compoundliteral ); |
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280 | ArrayLength::computeLength( translationUnit ); |
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281 | acceptAll( translationUnit, finder ); // xxx - remove this pass soon |
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282 | mutateAll( translationUnit, labelAddrFixer ); |
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283 | } |
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284 | |
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285 | void validateType( Type *type, const Indexer *indexer ) { |
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286 | PassVisitor<EnumAndPointerDecay> epc; |
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287 | PassVisitor<LinkReferenceToTypes> lrt( indexer ); |
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288 | PassVisitor<ForallPointerDecay> fpd; |
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289 | type->accept( epc ); |
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290 | type->accept( lrt ); |
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291 | type->accept( fpd ); |
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292 | } |
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293 | |
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294 | void HoistStruct::hoistStruct( std::list< Declaration * > &translationUnit ) { |
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295 | PassVisitor<HoistStruct> hoister; |
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296 | acceptAll( translationUnit, hoister ); |
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297 | } |
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298 | |
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299 | bool isStructOrUnion( Declaration *decl ) { |
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300 | return dynamic_cast< StructDecl * >( decl ) || dynamic_cast< UnionDecl * >( decl ); |
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301 | } |
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302 | |
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303 | template< typename AggDecl > |
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304 | void HoistStruct::handleAggregate( AggDecl *aggregateDecl ) { |
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305 | if ( parentAggr ) { |
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306 | // Add elements in stack order corresponding to nesting structure. |
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307 | declsToAddBefore.push_front( aggregateDecl ); |
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308 | } else { |
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309 | GuardValue( parentAggr ); |
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310 | parentAggr = aggregateDecl; |
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311 | } // if |
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312 | // Always remove the hoisted aggregate from the inner structure. |
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313 | GuardAction( [aggregateDecl]() { filter( aggregateDecl->members, isStructOrUnion, false ); } ); |
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314 | } |
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315 | |
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316 | void HoistStruct::previsit( EnumInstType * inst ) { |
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317 | if ( inst->baseEnum ) { |
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318 | declsToAddBefore.push_front( inst->baseEnum ); |
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319 | } |
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320 | } |
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321 | |
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322 | void HoistStruct::previsit( StructInstType * inst ) { |
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323 | if ( inst->baseStruct ) { |
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324 | declsToAddBefore.push_front( inst->baseStruct ); |
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325 | } |
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326 | } |
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327 | |
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328 | void HoistStruct::previsit( UnionInstType * inst ) { |
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329 | if ( inst->baseUnion ) { |
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330 | declsToAddBefore.push_front( inst->baseUnion ); |
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331 | } |
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332 | } |
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333 | |
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334 | void HoistStruct::previsit( StructDecl * aggregateDecl ) { |
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335 | handleAggregate( aggregateDecl ); |
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336 | } |
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337 | |
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338 | void HoistStruct::previsit( UnionDecl * aggregateDecl ) { |
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339 | handleAggregate( aggregateDecl ); |
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340 | } |
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341 | |
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342 | void EnumAndPointerDecay::previsit( EnumDecl *enumDecl ) { |
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343 | // Set the type of each member of the enumeration to be EnumConstant |
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344 | for ( std::list< Declaration * >::iterator i = enumDecl->get_members().begin(); i != enumDecl->get_members().end(); ++i ) { |
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345 | ObjectDecl * obj = dynamic_cast< ObjectDecl * >( *i ); |
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346 | assert( obj ); |
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347 | obj->set_type( new EnumInstType( Type::Qualifiers( Type::Const ), enumDecl->get_name() ) ); |
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348 | } // for |
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349 | } |
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350 | |
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351 | namespace { |
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352 | template< typename DWTList > |
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353 | void fixFunctionList( DWTList & dwts, FunctionType * func ) { |
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354 | // the only case in which "void" is valid is where it is the only one in the list; then it should be removed |
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355 | // entirely. other fix ups are handled by the FixFunction class |
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356 | typedef typename DWTList::iterator DWTIterator; |
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357 | DWTIterator begin( dwts.begin() ), end( dwts.end() ); |
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358 | if ( begin == end ) return; |
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359 | PassVisitor<FixFunction> fixer; |
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360 | DWTIterator i = begin; |
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361 | *i = (*i)->acceptMutator( fixer ); |
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362 | if ( fixer.pass.isVoid ) { |
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363 | DWTIterator j = i; |
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364 | ++i; |
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365 | delete *j; |
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366 | dwts.erase( j ); |
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367 | if ( i != end ) { |
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368 | throw SemanticError( func, "invalid type void in function type " ); |
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369 | } // if |
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370 | } else { |
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371 | ++i; |
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372 | for ( ; i != end; ++i ) { |
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373 | PassVisitor<FixFunction> fixer; |
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374 | *i = (*i)->acceptMutator( fixer ); |
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375 | if ( fixer.pass.isVoid ) { |
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376 | throw SemanticError( func, "invalid type void in function type " ); |
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377 | } // if |
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378 | } // for |
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379 | } // if |
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380 | } |
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381 | } |
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382 | |
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383 | void EnumAndPointerDecay::previsit( FunctionType *func ) { |
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384 | // Fix up parameters and return types |
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385 | fixFunctionList( func->get_parameters(), func ); |
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386 | fixFunctionList( func->get_returnVals(), func ); |
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387 | } |
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388 | |
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389 | LinkReferenceToTypes::LinkReferenceToTypes( const Indexer *other_indexer ) { |
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390 | if ( other_indexer ) { |
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391 | local_indexer = other_indexer; |
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392 | } else { |
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393 | local_indexer = &indexer; |
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394 | } // if |
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395 | } |
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396 | |
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397 | void LinkReferenceToTypes::postvisit( EnumInstType *enumInst ) { |
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398 | EnumDecl *st = local_indexer->lookupEnum( enumInst->get_name() ); |
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399 | // it's not a semantic error if the enum is not found, just an implicit forward declaration |
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400 | if ( st ) { |
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401 | //assert( ! enumInst->get_baseEnum() || enumInst->get_baseEnum()->get_members().empty() || ! st->get_members().empty() ); |
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402 | enumInst->set_baseEnum( st ); |
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403 | } // if |
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404 | if ( ! st || st->get_members().empty() ) { |
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405 | // use of forward declaration |
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406 | forwardEnums[ enumInst->get_name() ].push_back( enumInst ); |
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407 | } // if |
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408 | } |
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409 | |
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410 | void checkGenericParameters( ReferenceToType * inst ) { |
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411 | for ( Expression * param : inst->parameters ) { |
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412 | if ( ! dynamic_cast< TypeExpr * >( param ) ) { |
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413 | throw SemanticError( inst, "Expression parameters for generic types are currently unsupported: " ); |
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414 | } |
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415 | } |
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416 | } |
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417 | |
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418 | void LinkReferenceToTypes::postvisit( StructInstType *structInst ) { |
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419 | StructDecl *st = local_indexer->lookupStruct( structInst->get_name() ); |
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420 | // it's not a semantic error if the struct is not found, just an implicit forward declaration |
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421 | if ( st ) { |
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422 | //assert( ! structInst->get_baseStruct() || structInst->get_baseStruct()->get_members().empty() || ! st->get_members().empty() ); |
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423 | structInst->set_baseStruct( st ); |
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424 | } // if |
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425 | if ( ! st || st->get_members().empty() ) { |
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426 | // use of forward declaration |
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427 | forwardStructs[ structInst->get_name() ].push_back( structInst ); |
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428 | } // if |
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429 | checkGenericParameters( structInst ); |
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430 | } |
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431 | |
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432 | void LinkReferenceToTypes::postvisit( UnionInstType *unionInst ) { |
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433 | UnionDecl *un = local_indexer->lookupUnion( unionInst->get_name() ); |
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434 | // it's not a semantic error if the union is not found, just an implicit forward declaration |
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435 | if ( un ) { |
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436 | unionInst->set_baseUnion( un ); |
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437 | } // if |
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438 | if ( ! un || un->get_members().empty() ) { |
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439 | // use of forward declaration |
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440 | forwardUnions[ unionInst->get_name() ].push_back( unionInst ); |
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441 | } // if |
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442 | checkGenericParameters( unionInst ); |
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443 | } |
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444 | |
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445 | template< typename Decl > |
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446 | void normalizeAssertions( std::list< Decl * > & assertions ) { |
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447 | // ensure no duplicate trait members after the clone |
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448 | auto pred = [](Decl * d1, Decl * d2) { |
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449 | // only care if they're equal |
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450 | DeclarationWithType * dwt1 = dynamic_cast<DeclarationWithType *>( d1 ); |
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451 | DeclarationWithType * dwt2 = dynamic_cast<DeclarationWithType *>( d2 ); |
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452 | if ( dwt1 && dwt2 ) { |
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453 | if ( dwt1->get_name() == dwt2->get_name() && ResolvExpr::typesCompatible( dwt1->get_type(), dwt2->get_type(), SymTab::Indexer() ) ) { |
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454 | // std::cerr << "=========== equal:" << std::endl; |
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455 | // std::cerr << "d1: " << d1 << std::endl; |
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456 | // std::cerr << "d2: " << d2 << std::endl; |
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457 | return false; |
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458 | } |
---|
459 | } |
---|
460 | return d1 < d2; |
---|
461 | }; |
---|
462 | std::set<Decl *, decltype(pred)> unique_members( assertions.begin(), assertions.end(), pred ); |
---|
463 | // if ( unique_members.size() != assertions.size() ) { |
---|
464 | // std::cerr << "============different" << std::endl; |
---|
465 | // std::cerr << unique_members.size() << " " << assertions.size() << std::endl; |
---|
466 | // } |
---|
467 | |
---|
468 | std::list< Decl * > order; |
---|
469 | order.splice( order.end(), assertions ); |
---|
470 | std::copy_if( order.begin(), order.end(), back_inserter( assertions ), [&]( Decl * decl ) { |
---|
471 | return unique_members.count( decl ); |
---|
472 | }); |
---|
473 | } |
---|
474 | |
---|
475 | // expand assertions from trait instance, performing the appropriate type variable substitutions |
---|
476 | template< typename Iterator > |
---|
477 | void expandAssertions( TraitInstType * inst, Iterator out ) { |
---|
478 | assertf( inst->baseTrait, "Trait instance not linked to base trait: %s", toString( inst ).c_str() ); |
---|
479 | std::list< DeclarationWithType * > asserts; |
---|
480 | for ( Declaration * decl : inst->baseTrait->members ) { |
---|
481 | asserts.push_back( strict_dynamic_cast<DeclarationWithType *>( decl->clone() ) ); |
---|
482 | } |
---|
483 | // substitute trait decl parameters for instance parameters |
---|
484 | applySubstitution( inst->baseTrait->parameters.begin(), inst->baseTrait->parameters.end(), inst->parameters.begin(), asserts.begin(), asserts.end(), out ); |
---|
485 | } |
---|
486 | |
---|
487 | void LinkReferenceToTypes::postvisit( TraitDecl * traitDecl ) { |
---|
488 | if ( traitDecl->name == "sized" ) { |
---|
489 | // "sized" is a special trait - flick the sized status on for the type variable |
---|
490 | assertf( traitDecl->parameters.size() == 1, "Built-in trait 'sized' has incorrect number of parameters: %zd", traitDecl->parameters.size() ); |
---|
491 | TypeDecl * td = traitDecl->parameters.front(); |
---|
492 | td->set_sized( true ); |
---|
493 | } |
---|
494 | |
---|
495 | // move assertions from type parameters into the body of the trait |
---|
496 | for ( TypeDecl * td : traitDecl->parameters ) { |
---|
497 | for ( DeclarationWithType * assert : td->assertions ) { |
---|
498 | if ( TraitInstType * inst = dynamic_cast< TraitInstType * >( assert->get_type() ) ) { |
---|
499 | expandAssertions( inst, back_inserter( traitDecl->members ) ); |
---|
500 | } else { |
---|
501 | traitDecl->members.push_back( assert->clone() ); |
---|
502 | } |
---|
503 | } |
---|
504 | deleteAll( td->assertions ); |
---|
505 | td->assertions.clear(); |
---|
506 | } // for |
---|
507 | } |
---|
508 | |
---|
509 | void LinkReferenceToTypes::postvisit( TraitInstType * traitInst ) { |
---|
510 | // handle other traits |
---|
511 | TraitDecl *traitDecl = local_indexer->lookupTrait( traitInst->name ); |
---|
512 | if ( ! traitDecl ) { |
---|
513 | throw SemanticError( traitInst->location, "use of undeclared trait " + traitInst->name ); |
---|
514 | } // if |
---|
515 | if ( traitDecl->get_parameters().size() != traitInst->get_parameters().size() ) { |
---|
516 | throw SemanticError( traitInst, "incorrect number of trait parameters: " ); |
---|
517 | } // if |
---|
518 | traitInst->baseTrait = traitDecl; |
---|
519 | |
---|
520 | // need to carry over the 'sized' status of each decl in the instance |
---|
521 | for ( auto p : group_iterate( traitDecl->get_parameters(), traitInst->get_parameters() ) ) { |
---|
522 | TypeExpr * expr = dynamic_cast< TypeExpr * >( std::get<1>(p) ); |
---|
523 | if ( ! expr ) { |
---|
524 | throw SemanticError( std::get<1>(p), "Expression parameters for trait instances are currently unsupported: " ); |
---|
525 | } |
---|
526 | if ( TypeInstType * inst = dynamic_cast< TypeInstType * >( expr->get_type() ) ) { |
---|
527 | TypeDecl * formalDecl = std::get<0>(p); |
---|
528 | TypeDecl * instDecl = inst->get_baseType(); |
---|
529 | if ( formalDecl->get_sized() ) instDecl->set_sized( true ); |
---|
530 | } |
---|
531 | } |
---|
532 | // normalizeAssertions( traitInst->members ); |
---|
533 | } |
---|
534 | |
---|
535 | void LinkReferenceToTypes::postvisit( EnumDecl *enumDecl ) { |
---|
536 | // visit enum members first so that the types of self-referencing members are updated properly |
---|
537 | if ( ! enumDecl->get_members().empty() ) { |
---|
538 | ForwardEnumsType::iterator fwds = forwardEnums.find( enumDecl->get_name() ); |
---|
539 | if ( fwds != forwardEnums.end() ) { |
---|
540 | for ( std::list< EnumInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) { |
---|
541 | (*inst )->set_baseEnum( enumDecl ); |
---|
542 | } // for |
---|
543 | forwardEnums.erase( fwds ); |
---|
544 | } // if |
---|
545 | } // if |
---|
546 | } |
---|
547 | |
---|
548 | void LinkReferenceToTypes::renameGenericParams( std::list< TypeDecl * > & params ) { |
---|
549 | // rename generic type parameters uniquely so that they do not conflict with user-defined function forall parameters, e.g. |
---|
550 | // forall(otype T) |
---|
551 | // struct Box { |
---|
552 | // T x; |
---|
553 | // }; |
---|
554 | // forall(otype T) |
---|
555 | // void f(Box(T) b) { |
---|
556 | // ... |
---|
557 | // } |
---|
558 | // The T in Box and the T in f are different, so internally the naming must reflect that. |
---|
559 | GuardValue( inGeneric ); |
---|
560 | inGeneric = ! params.empty(); |
---|
561 | for ( TypeDecl * td : params ) { |
---|
562 | td->name = "__" + td->name + "_generic_"; |
---|
563 | } |
---|
564 | } |
---|
565 | |
---|
566 | void LinkReferenceToTypes::previsit( StructDecl * structDecl ) { |
---|
567 | renameGenericParams( structDecl->parameters ); |
---|
568 | } |
---|
569 | |
---|
570 | void LinkReferenceToTypes::previsit( UnionDecl * unionDecl ) { |
---|
571 | renameGenericParams( unionDecl->parameters ); |
---|
572 | } |
---|
573 | |
---|
574 | void LinkReferenceToTypes::postvisit( StructDecl *structDecl ) { |
---|
575 | // visit struct members first so that the types of self-referencing members are updated properly |
---|
576 | // xxx - need to ensure that type parameters match up between forward declarations and definition (most importantly, number of type parameters and their defaults) |
---|
577 | if ( ! structDecl->get_members().empty() ) { |
---|
578 | ForwardStructsType::iterator fwds = forwardStructs.find( structDecl->get_name() ); |
---|
579 | if ( fwds != forwardStructs.end() ) { |
---|
580 | for ( std::list< StructInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) { |
---|
581 | (*inst )->set_baseStruct( structDecl ); |
---|
582 | } // for |
---|
583 | forwardStructs.erase( fwds ); |
---|
584 | } // if |
---|
585 | } // if |
---|
586 | } |
---|
587 | |
---|
588 | void LinkReferenceToTypes::postvisit( UnionDecl *unionDecl ) { |
---|
589 | if ( ! unionDecl->get_members().empty() ) { |
---|
590 | ForwardUnionsType::iterator fwds = forwardUnions.find( unionDecl->get_name() ); |
---|
591 | if ( fwds != forwardUnions.end() ) { |
---|
592 | for ( std::list< UnionInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) { |
---|
593 | (*inst )->set_baseUnion( unionDecl ); |
---|
594 | } // for |
---|
595 | forwardUnions.erase( fwds ); |
---|
596 | } // if |
---|
597 | } // if |
---|
598 | } |
---|
599 | |
---|
600 | void LinkReferenceToTypes::postvisit( TypeInstType *typeInst ) { |
---|
601 | // ensure generic parameter instances are renamed like the base type |
---|
602 | if ( inGeneric && typeInst->baseType ) typeInst->name = typeInst->baseType->name; |
---|
603 | if ( NamedTypeDecl *namedTypeDecl = local_indexer->lookupType( typeInst->get_name() ) ) { |
---|
604 | if ( TypeDecl *typeDecl = dynamic_cast< TypeDecl * >( namedTypeDecl ) ) { |
---|
605 | typeInst->set_isFtype( typeDecl->get_kind() == TypeDecl::Ftype ); |
---|
606 | } // if |
---|
607 | } // if |
---|
608 | } |
---|
609 | |
---|
610 | /// Fix up assertions - flattens assertion lists, removing all trait instances |
---|
611 | void forallFixer( std::list< TypeDecl * > & forall, BaseSyntaxNode * node ) { |
---|
612 | for ( TypeDecl * type : forall ) { |
---|
613 | std::list< DeclarationWithType * > asserts; |
---|
614 | asserts.splice( asserts.end(), type->assertions ); |
---|
615 | // expand trait instances into their members |
---|
616 | for ( DeclarationWithType * assertion : asserts ) { |
---|
617 | if ( TraitInstType *traitInst = dynamic_cast< TraitInstType * >( assertion->get_type() ) ) { |
---|
618 | // expand trait instance into all of its members |
---|
619 | expandAssertions( traitInst, back_inserter( type->assertions ) ); |
---|
620 | delete traitInst; |
---|
621 | } else { |
---|
622 | // pass other assertions through |
---|
623 | type->assertions.push_back( assertion ); |
---|
624 | } // if |
---|
625 | } // for |
---|
626 | // apply FixFunction to every assertion to check for invalid void type |
---|
627 | for ( DeclarationWithType *& assertion : type->assertions ) { |
---|
628 | PassVisitor<FixFunction> fixer; |
---|
629 | assertion = assertion->acceptMutator( fixer ); |
---|
630 | if ( fixer.pass.isVoid ) { |
---|
631 | throw SemanticError( node, "invalid type void in assertion of function " ); |
---|
632 | } // if |
---|
633 | } // for |
---|
634 | // normalizeAssertions( type->assertions ); |
---|
635 | } // for |
---|
636 | } |
---|
637 | |
---|
638 | void ForallPointerDecay::previsit( ObjectDecl *object ) { |
---|
639 | forallFixer( object->type->forall, object ); |
---|
640 | if ( PointerType *pointer = dynamic_cast< PointerType * >( object->type ) ) { |
---|
641 | forallFixer( pointer->base->forall, object ); |
---|
642 | } // if |
---|
643 | object->fixUniqueId(); |
---|
644 | } |
---|
645 | |
---|
646 | void ForallPointerDecay::previsit( FunctionDecl *func ) { |
---|
647 | forallFixer( func->type->forall, func ); |
---|
648 | func->fixUniqueId(); |
---|
649 | } |
---|
650 | |
---|
651 | void ForallPointerDecay::previsit( StructDecl * aggrDecl ) { |
---|
652 | forallFixer( aggrDecl->parameters, aggrDecl ); |
---|
653 | } |
---|
654 | |
---|
655 | void ForallPointerDecay::previsit( UnionDecl * aggrDecl ) { |
---|
656 | forallFixer( aggrDecl->parameters, aggrDecl ); |
---|
657 | } |
---|
658 | |
---|
659 | void ReturnChecker::checkFunctionReturns( std::list< Declaration * > & translationUnit ) { |
---|
660 | PassVisitor<ReturnChecker> checker; |
---|
661 | acceptAll( translationUnit, checker ); |
---|
662 | } |
---|
663 | |
---|
664 | void ReturnChecker::previsit( FunctionDecl * functionDecl ) { |
---|
665 | GuardValue( returnVals ); |
---|
666 | returnVals = functionDecl->get_functionType()->get_returnVals(); |
---|
667 | } |
---|
668 | |
---|
669 | void ReturnChecker::previsit( ReturnStmt * returnStmt ) { |
---|
670 | // Previously this also checked for the existence of an expr paired with no return values on |
---|
671 | // the function return type. This is incorrect, since you can have an expression attached to |
---|
672 | // a return statement in a void-returning function in C. The expression is treated as if it |
---|
673 | // were cast to void. |
---|
674 | if ( ! returnStmt->get_expr() && returnVals.size() != 0 ) { |
---|
675 | throw SemanticError( returnStmt, "Non-void function returns no values: " ); |
---|
676 | } |
---|
677 | } |
---|
678 | |
---|
679 | |
---|
680 | bool isTypedef( Declaration *decl ) { |
---|
681 | return dynamic_cast< TypedefDecl * >( decl ); |
---|
682 | } |
---|
683 | |
---|
684 | void EliminateTypedef::eliminateTypedef( std::list< Declaration * > &translationUnit ) { |
---|
685 | PassVisitor<EliminateTypedef> eliminator; |
---|
686 | mutateAll( translationUnit, eliminator ); |
---|
687 | if ( eliminator.pass.typedefNames.count( "size_t" ) ) { |
---|
688 | // grab and remember declaration of size_t |
---|
689 | SizeType = eliminator.pass.typedefNames["size_t"].first->get_base()->clone(); |
---|
690 | } else { |
---|
691 | // xxx - missing global typedef for size_t - default to long unsigned int, even though that may be wrong |
---|
692 | // eventually should have a warning for this case. |
---|
693 | SizeType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ); |
---|
694 | } |
---|
695 | filter( translationUnit, isTypedef, true ); |
---|
696 | } |
---|
697 | |
---|
698 | Type * EliminateTypedef::postmutate( TypeInstType * typeInst ) { |
---|
699 | // instances of typedef types will come here. If it is an instance |
---|
700 | // of a typdef type, link the instance to its actual type. |
---|
701 | TypedefMap::const_iterator def = typedefNames.find( typeInst->get_name() ); |
---|
702 | if ( def != typedefNames.end() ) { |
---|
703 | Type *ret = def->second.first->base->clone(); |
---|
704 | ret->get_qualifiers() |= typeInst->get_qualifiers(); |
---|
705 | // attributes are not carried over from typedef to function parameters/return values |
---|
706 | if ( ! inFunctionType ) { |
---|
707 | ret->attributes.splice( ret->attributes.end(), typeInst->attributes ); |
---|
708 | } else { |
---|
709 | deleteAll( ret->attributes ); |
---|
710 | ret->attributes.clear(); |
---|
711 | } |
---|
712 | // place instance parameters on the typedef'd type |
---|
713 | if ( ! typeInst->parameters.empty() ) { |
---|
714 | ReferenceToType *rtt = dynamic_cast<ReferenceToType*>(ret); |
---|
715 | if ( ! rtt ) { |
---|
716 | throw SemanticError( typeInst->location, "Cannot apply type parameters to base type of " + typeInst->name ); |
---|
717 | } |
---|
718 | rtt->get_parameters().clear(); |
---|
719 | cloneAll( typeInst->parameters, rtt->parameters ); |
---|
720 | mutateAll( rtt->parameters, *visitor ); // recursively fix typedefs on parameters |
---|
721 | } // if |
---|
722 | delete typeInst; |
---|
723 | return ret; |
---|
724 | } else { |
---|
725 | TypeDeclMap::const_iterator base = typedeclNames.find( typeInst->get_name() ); |
---|
726 | assertf( base != typedeclNames.end(), "Cannot find typedecl name %s", typeInst->name.c_str() ); |
---|
727 | typeInst->set_baseType( base->second ); |
---|
728 | } // if |
---|
729 | return typeInst; |
---|
730 | } |
---|
731 | |
---|
732 | struct VarLenChecker : WithShortCircuiting { |
---|
733 | void previsit( FunctionType * ) { visit_children = false; } |
---|
734 | void previsit( ArrayType * at ) { |
---|
735 | isVarLen |= at->isVarLen; |
---|
736 | } |
---|
737 | bool isVarLen = false; |
---|
738 | }; |
---|
739 | |
---|
740 | bool isVariableLength( Type * t ) { |
---|
741 | PassVisitor<VarLenChecker> varLenChecker; |
---|
742 | maybeAccept( t, varLenChecker ); |
---|
743 | return varLenChecker.pass.isVarLen; |
---|
744 | } |
---|
745 | |
---|
746 | Declaration *EliminateTypedef::postmutate( TypedefDecl * tyDecl ) { |
---|
747 | if ( typedefNames.count( tyDecl->get_name() ) == 1 && typedefNames[ tyDecl->get_name() ].second == scopeLevel ) { |
---|
748 | // typedef to the same name from the same scope |
---|
749 | // must be from the same type |
---|
750 | |
---|
751 | Type * t1 = tyDecl->get_base(); |
---|
752 | Type * t2 = typedefNames[ tyDecl->get_name() ].first->get_base(); |
---|
753 | if ( ! ResolvExpr::typesCompatible( t1, t2, Indexer() ) ) { |
---|
754 | throw SemanticError( tyDecl->location, "Cannot redefine typedef: " + tyDecl->name ); |
---|
755 | } |
---|
756 | // Cannot redefine VLA typedefs. Note: this is slightly incorrect, because our notion of VLAs |
---|
757 | // at this point in the translator is imprecise. In particular, this will disallow redefining typedefs |
---|
758 | // with arrays whose dimension is an enumerator or a cast of a constant/enumerator. The effort required |
---|
759 | // to fix this corner case likely outweighs the utility of allowing it. |
---|
760 | if ( isVariableLength( t1 ) || isVariableLength( t2 ) ) { |
---|
761 | throw SemanticError( tyDecl->location, "Cannot redefine typedef: " + tyDecl->name ); |
---|
762 | } |
---|
763 | } else { |
---|
764 | typedefNames[ tyDecl->get_name() ] = std::make_pair( TypedefDeclPtr( tyDecl ), scopeLevel ); |
---|
765 | } // if |
---|
766 | |
---|
767 | // When a typedef is a forward declaration: |
---|
768 | // typedef struct screen SCREEN; |
---|
769 | // the declaration portion must be retained: |
---|
770 | // struct screen; |
---|
771 | // because the expansion of the typedef is: |
---|
772 | // void rtn( SCREEN *p ) => void rtn( struct screen *p ) |
---|
773 | // hence the type-name "screen" must be defined. |
---|
774 | // Note, qualifiers on the typedef are superfluous for the forward declaration. |
---|
775 | |
---|
776 | Type *designatorType = tyDecl->get_base()->stripDeclarator(); |
---|
777 | if ( StructInstType *aggDecl = dynamic_cast< StructInstType * >( designatorType ) ) { |
---|
778 | return new StructDecl( aggDecl->get_name(), DeclarationNode::Struct, noAttributes, tyDecl->get_linkage() ); |
---|
779 | } else if ( UnionInstType *aggDecl = dynamic_cast< UnionInstType * >( designatorType ) ) { |
---|
780 | return new UnionDecl( aggDecl->get_name(), noAttributes, tyDecl->get_linkage() ); |
---|
781 | } else if ( EnumInstType *enumDecl = dynamic_cast< EnumInstType * >( designatorType ) ) { |
---|
782 | return new EnumDecl( enumDecl->get_name(), noAttributes, tyDecl->get_linkage() ); |
---|
783 | } else { |
---|
784 | return tyDecl->clone(); |
---|
785 | } // if |
---|
786 | } |
---|
787 | |
---|
788 | void EliminateTypedef::premutate( TypeDecl * typeDecl ) { |
---|
789 | TypedefMap::iterator i = typedefNames.find( typeDecl->get_name() ); |
---|
790 | if ( i != typedefNames.end() ) { |
---|
791 | typedefNames.erase( i ) ; |
---|
792 | } // if |
---|
793 | |
---|
794 | typedeclNames[ typeDecl->get_name() ] = typeDecl; |
---|
795 | } |
---|
796 | |
---|
797 | void EliminateTypedef::premutate( FunctionDecl * ) { |
---|
798 | GuardScope( typedefNames ); |
---|
799 | } |
---|
800 | |
---|
801 | void EliminateTypedef::premutate( ObjectDecl * ) { |
---|
802 | GuardScope( typedefNames ); |
---|
803 | } |
---|
804 | |
---|
805 | DeclarationWithType *EliminateTypedef::postmutate( ObjectDecl * objDecl ) { |
---|
806 | if ( FunctionType *funtype = dynamic_cast<FunctionType *>( objDecl->get_type() ) ) { // function type? |
---|
807 | // replace the current object declaration with a function declaration |
---|
808 | FunctionDecl * newDecl = new FunctionDecl( objDecl->get_name(), objDecl->get_storageClasses(), objDecl->get_linkage(), funtype, 0, objDecl->get_attributes(), objDecl->get_funcSpec() ); |
---|
809 | objDecl->get_attributes().clear(); |
---|
810 | objDecl->set_type( nullptr ); |
---|
811 | delete objDecl; |
---|
812 | return newDecl; |
---|
813 | } // if |
---|
814 | return objDecl; |
---|
815 | } |
---|
816 | |
---|
817 | void EliminateTypedef::premutate( CastExpr * ) { |
---|
818 | GuardScope( typedefNames ); |
---|
819 | } |
---|
820 | |
---|
821 | void EliminateTypedef::premutate( CompoundStmt * ) { |
---|
822 | GuardScope( typedefNames ); |
---|
823 | scopeLevel += 1; |
---|
824 | GuardAction( [this](){ scopeLevel -= 1; } ); |
---|
825 | } |
---|
826 | |
---|
827 | CompoundStmt *EliminateTypedef::postmutate( CompoundStmt * compoundStmt ) { |
---|
828 | // remove and delete decl stmts |
---|
829 | filter( compoundStmt->kids, [](Statement * stmt) { |
---|
830 | if ( DeclStmt *declStmt = dynamic_cast< DeclStmt * >( stmt ) ) { |
---|
831 | if ( dynamic_cast< TypedefDecl * >( declStmt->get_decl() ) ) { |
---|
832 | return true; |
---|
833 | } // if |
---|
834 | } // if |
---|
835 | return false; |
---|
836 | }, true); |
---|
837 | return compoundStmt; |
---|
838 | } |
---|
839 | |
---|
840 | // there may be typedefs nested within aggregates. in order for everything to work properly, these should be removed |
---|
841 | // as well |
---|
842 | template<typename AggDecl> |
---|
843 | AggDecl *EliminateTypedef::handleAggregate( AggDecl * aggDecl ) { |
---|
844 | filter( aggDecl->members, isTypedef, true ); |
---|
845 | return aggDecl; |
---|
846 | } |
---|
847 | |
---|
848 | template<typename AggDecl> |
---|
849 | void EliminateTypedef::addImplicitTypedef( AggDecl * aggDecl ) { |
---|
850 | if ( typedefNames.count( aggDecl->get_name() ) == 0 ) { |
---|
851 | Type *type = nullptr; |
---|
852 | if ( StructDecl * newDeclStructDecl = dynamic_cast< StructDecl * >( aggDecl ) ) { |
---|
853 | type = new StructInstType( Type::Qualifiers(), newDeclStructDecl->get_name() ); |
---|
854 | } else if ( UnionDecl * newDeclUnionDecl = dynamic_cast< UnionDecl * >( aggDecl ) ) { |
---|
855 | type = new UnionInstType( Type::Qualifiers(), newDeclUnionDecl->get_name() ); |
---|
856 | } else if ( EnumDecl * newDeclEnumDecl = dynamic_cast< EnumDecl * >( aggDecl ) ) { |
---|
857 | type = new EnumInstType( Type::Qualifiers(), newDeclEnumDecl->get_name() ); |
---|
858 | } // if |
---|
859 | TypedefDeclPtr tyDecl( new TypedefDecl( aggDecl->get_name(), aggDecl->location, Type::StorageClasses(), type, aggDecl->get_linkage() ) ); |
---|
860 | typedefNames[ aggDecl->get_name() ] = std::make_pair( std::move( tyDecl ), scopeLevel ); |
---|
861 | } // if |
---|
862 | } |
---|
863 | |
---|
864 | void EliminateTypedef::premutate( StructDecl * structDecl ) { |
---|
865 | addImplicitTypedef( structDecl ); |
---|
866 | } |
---|
867 | |
---|
868 | |
---|
869 | Declaration *EliminateTypedef::postmutate( StructDecl * structDecl ) { |
---|
870 | return handleAggregate( structDecl ); |
---|
871 | } |
---|
872 | |
---|
873 | void EliminateTypedef::premutate( UnionDecl * unionDecl ) { |
---|
874 | addImplicitTypedef( unionDecl ); |
---|
875 | } |
---|
876 | |
---|
877 | Declaration *EliminateTypedef::postmutate( UnionDecl * unionDecl ) { |
---|
878 | return handleAggregate( unionDecl ); |
---|
879 | } |
---|
880 | |
---|
881 | void EliminateTypedef::premutate( EnumDecl * enumDecl ) { |
---|
882 | addImplicitTypedef( enumDecl ); |
---|
883 | } |
---|
884 | |
---|
885 | Declaration *EliminateTypedef::postmutate( EnumDecl * enumDecl ) { |
---|
886 | return handleAggregate( enumDecl ); |
---|
887 | } |
---|
888 | |
---|
889 | Declaration *EliminateTypedef::postmutate( TraitDecl * traitDecl ) { |
---|
890 | return handleAggregate( traitDecl ); |
---|
891 | } |
---|
892 | |
---|
893 | void EliminateTypedef::premutate( FunctionType * ) { |
---|
894 | GuardValue( inFunctionType ); |
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895 | inFunctionType = true; |
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896 | } |
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897 | |
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898 | void VerifyCtorDtorAssign::verify( std::list< Declaration * > & translationUnit ) { |
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899 | PassVisitor<VerifyCtorDtorAssign> verifier; |
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900 | acceptAll( translationUnit, verifier ); |
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901 | } |
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902 | |
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903 | void VerifyCtorDtorAssign::previsit( FunctionDecl * funcDecl ) { |
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904 | FunctionType * funcType = funcDecl->get_functionType(); |
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905 | std::list< DeclarationWithType * > &returnVals = funcType->get_returnVals(); |
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906 | std::list< DeclarationWithType * > ¶ms = funcType->get_parameters(); |
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907 | |
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908 | if ( CodeGen::isCtorDtorAssign( funcDecl->get_name() ) ) { // TODO: also check /=, etc. |
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909 | if ( params.size() == 0 ) { |
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910 | throw SemanticError( funcDecl, "Constructors, destructors, and assignment functions require at least one parameter " ); |
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911 | } |
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912 | ReferenceType * refType = dynamic_cast< ReferenceType * >( params.front()->get_type() ); |
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913 | if ( ! refType ) { |
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914 | throw SemanticError( funcDecl, "First parameter of a constructor, destructor, or assignment function must be a reference " ); |
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915 | } |
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916 | if ( CodeGen::isCtorDtor( funcDecl->get_name() ) && returnVals.size() != 0 ) { |
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917 | throw SemanticError( funcDecl, "Constructors and destructors cannot have explicit return values " ); |
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918 | } |
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919 | } |
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920 | } |
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921 | |
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922 | template< typename Aggr > |
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923 | void validateGeneric( Aggr * inst ) { |
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924 | std::list< TypeDecl * > * params = inst->get_baseParameters(); |
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925 | if ( params ) { |
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926 | std::list< Expression * > & args = inst->get_parameters(); |
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927 | |
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928 | // insert defaults arguments when a type argument is missing (currently only supports missing arguments at the end of the list). |
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929 | // A substitution is used to ensure that defaults are replaced correctly, e.g., |
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930 | // forall(otype T, otype alloc = heap_allocator(T)) struct vector; |
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931 | // vector(int) v; |
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932 | // after insertion of default values becomes |
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933 | // vector(int, heap_allocator(T)) |
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934 | // and the substitution is built with T=int so that after substitution, the result is |
---|
935 | // vector(int, heap_allocator(int)) |
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936 | TypeSubstitution sub; |
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937 | auto paramIter = params->begin(); |
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938 | for ( size_t i = 0; paramIter != params->end(); ++paramIter, ++i ) { |
---|
939 | if ( i < args.size() ) { |
---|
940 | TypeExpr * expr = strict_dynamic_cast< TypeExpr * >( *std::next( args.begin(), i ) ); |
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941 | sub.add( (*paramIter)->get_name(), expr->get_type()->clone() ); |
---|
942 | } else if ( i == args.size() ) { |
---|
943 | Type * defaultType = (*paramIter)->get_init(); |
---|
944 | if ( defaultType ) { |
---|
945 | args.push_back( new TypeExpr( defaultType->clone() ) ); |
---|
946 | sub.add( (*paramIter)->get_name(), defaultType->clone() ); |
---|
947 | } |
---|
948 | } |
---|
949 | } |
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950 | |
---|
951 | sub.apply( inst ); |
---|
952 | if ( args.size() < params->size() ) throw SemanticError( inst, "Too few type arguments in generic type " ); |
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953 | if ( args.size() > params->size() ) throw SemanticError( inst, "Too many type arguments in generic type " ); |
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954 | } |
---|
955 | } |
---|
956 | |
---|
957 | void ValidateGenericParameters::previsit( StructInstType * inst ) { |
---|
958 | validateGeneric( inst ); |
---|
959 | } |
---|
960 | |
---|
961 | void ValidateGenericParameters::previsit( UnionInstType * inst ) { |
---|
962 | validateGeneric( inst ); |
---|
963 | } |
---|
964 | |
---|
965 | void CompoundLiteral::premutate( ObjectDecl *objectDecl ) { |
---|
966 | storageClasses = objectDecl->get_storageClasses(); |
---|
967 | } |
---|
968 | |
---|
969 | Expression *CompoundLiteral::postmutate( CompoundLiteralExpr *compLitExpr ) { |
---|
970 | // transform [storage_class] ... (struct S){ 3, ... }; |
---|
971 | // into [storage_class] struct S temp = { 3, ... }; |
---|
972 | static UniqueName indexName( "_compLit" ); |
---|
973 | |
---|
974 | ObjectDecl *tempvar = new ObjectDecl( indexName.newName(), storageClasses, LinkageSpec::C, nullptr, compLitExpr->get_result(), compLitExpr->get_initializer() ); |
---|
975 | compLitExpr->set_result( nullptr ); |
---|
976 | compLitExpr->set_initializer( nullptr ); |
---|
977 | delete compLitExpr; |
---|
978 | declsToAddBefore.push_back( tempvar ); // add modified temporary to current block |
---|
979 | return new VariableExpr( tempvar ); |
---|
980 | } |
---|
981 | |
---|
982 | void ReturnTypeFixer::fix( std::list< Declaration * > &translationUnit ) { |
---|
983 | PassVisitor<ReturnTypeFixer> fixer; |
---|
984 | acceptAll( translationUnit, fixer ); |
---|
985 | } |
---|
986 | |
---|
987 | void ReturnTypeFixer::postvisit( FunctionDecl * functionDecl ) { |
---|
988 | FunctionType * ftype = functionDecl->get_functionType(); |
---|
989 | std::list< DeclarationWithType * > & retVals = ftype->get_returnVals(); |
---|
990 | assertf( retVals.size() == 0 || retVals.size() == 1, "Function %s has too many return values: %zu", functionDecl->get_name().c_str(), retVals.size() ); |
---|
991 | if ( retVals.size() == 1 ) { |
---|
992 | // ensure all function return values have a name - use the name of the function to disambiguate (this also provides a nice bit of help for debugging). |
---|
993 | // ensure other return values have a name. |
---|
994 | DeclarationWithType * ret = retVals.front(); |
---|
995 | if ( ret->get_name() == "" ) { |
---|
996 | ret->set_name( toString( "_retval_", CodeGen::genName( functionDecl ) ) ); |
---|
997 | } |
---|
998 | ret->get_attributes().push_back( new Attribute( "unused" ) ); |
---|
999 | } |
---|
1000 | } |
---|
1001 | |
---|
1002 | void ReturnTypeFixer::postvisit( FunctionType * ftype ) { |
---|
1003 | // xxx - need to handle named return values - this information needs to be saved somehow |
---|
1004 | // so that resolution has access to the names. |
---|
1005 | // Note that this pass needs to happen early so that other passes which look for tuple types |
---|
1006 | // find them in all of the right places, including function return types. |
---|
1007 | std::list< DeclarationWithType * > & retVals = ftype->get_returnVals(); |
---|
1008 | if ( retVals.size() > 1 ) { |
---|
1009 | // generate a single return parameter which is the tuple of all of the return values |
---|
1010 | TupleType * tupleType = strict_dynamic_cast< TupleType * >( ResolvExpr::extractResultType( ftype ) ); |
---|
1011 | // ensure return value is not destructed by explicitly creating an empty ListInit node wherein maybeConstruct is false. |
---|
1012 | ObjectDecl * newRet = new ObjectDecl( "", Type::StorageClasses(), LinkageSpec::Cforall, 0, tupleType, new ListInit( std::list<Initializer*>(), noDesignators, false ) ); |
---|
1013 | deleteAll( retVals ); |
---|
1014 | retVals.clear(); |
---|
1015 | retVals.push_back( newRet ); |
---|
1016 | } |
---|
1017 | } |
---|
1018 | |
---|
1019 | void ArrayLength::computeLength( std::list< Declaration * > & translationUnit ) { |
---|
1020 | PassVisitor<ArrayLength> len; |
---|
1021 | acceptAll( translationUnit, len ); |
---|
1022 | } |
---|
1023 | |
---|
1024 | void ArrayLength::previsit( ObjectDecl * objDecl ) { |
---|
1025 | if ( ArrayType * at = dynamic_cast< ArrayType * >( objDecl->get_type() ) ) { |
---|
1026 | if ( at->get_dimension() ) return; |
---|
1027 | if ( ListInit * init = dynamic_cast< ListInit * >( objDecl->get_init() ) ) { |
---|
1028 | at->set_dimension( new ConstantExpr( Constant::from_ulong( init->get_initializers().size() ) ) ); |
---|
1029 | } |
---|
1030 | } |
---|
1031 | } |
---|
1032 | |
---|
1033 | struct LabelFinder { |
---|
1034 | std::set< Label > & labels; |
---|
1035 | LabelFinder( std::set< Label > & labels ) : labels( labels ) {} |
---|
1036 | void previsit( Statement * stmt ) { |
---|
1037 | for ( Label & l : stmt->labels ) { |
---|
1038 | labels.insert( l ); |
---|
1039 | } |
---|
1040 | } |
---|
1041 | }; |
---|
1042 | |
---|
1043 | void LabelAddressFixer::premutate( FunctionDecl * funcDecl ) { |
---|
1044 | GuardValue( labels ); |
---|
1045 | PassVisitor<LabelFinder> finder( labels ); |
---|
1046 | funcDecl->accept( finder ); |
---|
1047 | } |
---|
1048 | |
---|
1049 | Expression * LabelAddressFixer::postmutate( AddressExpr * addrExpr ) { |
---|
1050 | // convert &&label into label address |
---|
1051 | if ( AddressExpr * inner = dynamic_cast< AddressExpr * >( addrExpr->arg ) ) { |
---|
1052 | if ( NameExpr * nameExpr = dynamic_cast< NameExpr * >( inner->arg ) ) { |
---|
1053 | if ( labels.count( nameExpr->name ) ) { |
---|
1054 | Label name = nameExpr->name; |
---|
1055 | delete addrExpr; |
---|
1056 | return new LabelAddressExpr( name ); |
---|
1057 | } |
---|
1058 | } |
---|
1059 | } |
---|
1060 | return addrExpr; |
---|
1061 | } |
---|
1062 | |
---|
1063 | void FindSpecialDeclarations::previsit( FunctionDecl * funcDecl ) { |
---|
1064 | if ( ! dereferenceOperator ) { |
---|
1065 | if ( funcDecl->get_name() == "*?" && funcDecl->get_linkage() == LinkageSpec::Intrinsic ) { |
---|
1066 | FunctionType * ftype = funcDecl->get_functionType(); |
---|
1067 | if ( ftype->get_parameters().size() == 1 && ftype->get_parameters().front()->get_type()->get_qualifiers() == Type::Qualifiers() ) { |
---|
1068 | dereferenceOperator = funcDecl; |
---|
1069 | } |
---|
1070 | } |
---|
1071 | } |
---|
1072 | } |
---|
1073 | } // namespace SymTab |
---|
1074 | |
---|
1075 | // Local Variables: // |
---|
1076 | // tab-width: 4 // |
---|
1077 | // mode: c++ // |
---|
1078 | // compile-command: "make install" // |
---|
1079 | // End: // |
---|