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 | // Autogen.h -- |
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8 | // |
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9 | // Author : Rob Schluntz |
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10 | // Created On : Sun May 17 21:53:34 2015 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Tue Mar 14 23:13:28 2017 |
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13 | // Update Count : 7 |
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14 | // |
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15 | |
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16 | #ifndef AUTOGEN_H |
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17 | #define AUTOGEN_H |
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18 | |
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19 | #include <string> |
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20 | #include "SynTree/Statement.h" |
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21 | #include "SynTree/Expression.h" |
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22 | #include "SynTree/Declaration.h" |
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23 | #include "SynTree/Initializer.h" |
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24 | #include "InitTweak/InitTweak.h" |
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25 | |
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26 | namespace SymTab { |
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27 | /// Generates assignment operators, constructors, and destructor for aggregate types as required |
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28 | void autogenerateRoutines( std::list< Declaration * > &translationUnit ); |
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29 | |
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30 | /// returns true if obj's name is the empty string and it has a bitfield width |
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31 | bool isUnnamedBitfield( ObjectDecl * obj ); |
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32 | |
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33 | /// size_t type - set when size_t typedef is seen. Useful in a few places, |
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34 | /// such as in determining array dimension type |
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35 | extern Type * SizeType; |
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36 | |
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37 | /// inserts into out a generated call expression to function fname with arguments dstParam and srcParam. Intended to be used with generated ?=?, ?{}, and ^?{} calls. |
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38 | template< typename OutputIterator > |
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39 | Statement * genCall( InitTweak::InitExpander & srcParam, Expression * dstParam, const std::string & fname, OutputIterator out, Type * type, bool addCast = false, bool forward = true ); |
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40 | |
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41 | /// inserts into out a generated call expression to function fname with arguments dstParam and srcParam. Should only be called with non-array types. |
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42 | /// optionally returns a statement which must be inserted prior to the containing loop, if there is one |
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43 | template< typename OutputIterator > |
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44 | Statement * genScalarCall( InitTweak::InitExpander & srcParam, Expression *dstParam, const std::string & fname, OutputIterator out, Type * type, bool addCast = false ) { |
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45 | // want to be able to generate assignment, ctor, and dtor generically, |
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46 | // so fname is either ?=?, ?{}, or ^?{} |
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47 | UntypedExpr *fExpr = new UntypedExpr( new NameExpr( fname ) ); |
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48 | |
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49 | // do something special for unnamed members |
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50 | dstParam = new AddressExpr( dstParam ); |
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51 | if ( addCast ) { |
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52 | // cast to T* with qualifiers removed, so that qualified objects can be constructed |
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53 | // and destructed with the same functions as non-qualified objects. |
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54 | // unfortunately, lvalue is considered a qualifier. For AddressExpr to resolve, its argument |
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55 | // must have an lvalue qualified type, so remove all qualifiers except lvalue. If we ever |
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56 | // remove lvalue as a qualifier, this can change to |
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57 | // type->get_qualifiers() = Type::Qualifiers(); |
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58 | assert( type ); |
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59 | Type * castType = type->clone(); |
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60 | // castType->get_qualifiers() -= Type::Qualifiers(true, true, true, false, true, false); |
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61 | castType->get_qualifiers() -= Type::Qualifiers( Type::Const | Type::Volatile | Type::Restrict | Type::Atomic ); |
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62 | castType->set_isLvalue( true ); // xxx - might not need this |
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63 | dstParam = new CastExpr( dstParam, new PointerType( Type::Qualifiers(), castType ) ); |
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64 | } |
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65 | fExpr->get_args().push_back( dstParam ); |
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66 | |
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67 | Statement * listInit = srcParam.buildListInit( fExpr ); |
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68 | |
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69 | std::list< Expression * > args = *++srcParam; |
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70 | fExpr->get_args().splice( fExpr->get_args().end(), args ); |
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71 | |
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72 | *out++ = new ExprStmt( noLabels, fExpr ); |
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73 | |
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74 | srcParam.clearArrayIndices(); |
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75 | |
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76 | return listInit; |
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77 | } |
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78 | |
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79 | /// Store in out a loop which calls fname on each element of the array with srcParam and dstParam as arguments. |
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80 | /// If forward is true, loop goes from 0 to N-1, else N-1 to 0 |
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81 | template< typename OutputIterator > |
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82 | void genArrayCall( InitTweak::InitExpander & srcParam, Expression *dstParam, const std::string & fname, OutputIterator out, ArrayType *array, bool addCast = false, bool forward = true ) { |
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83 | static UniqueName indexName( "_index" ); |
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84 | |
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85 | // for a flexible array member nothing is done -- user must define own assignment |
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86 | if ( ! array->get_dimension() ) return ; |
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87 | |
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88 | Expression * begin, * end, * update, * cmp; |
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89 | if ( forward ) { |
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90 | // generate: for ( int i = 0; i < 0; ++i ) |
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91 | begin = new ConstantExpr( Constant( new ZeroType( emptyQualifiers ), "0" ) ); |
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92 | end = array->get_dimension()->clone(); |
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93 | cmp = new NameExpr( "?<?" ); |
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94 | update = new NameExpr( "++?" ); |
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95 | } else { |
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96 | // generate: for ( int i = N-1; i >= 0; --i ) |
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97 | begin = new UntypedExpr( new NameExpr( "?-?" ) ); |
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98 | ((UntypedExpr*)begin)->get_args().push_back( array->get_dimension()->clone() ); |
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99 | ((UntypedExpr*)begin)->get_args().push_back( new ConstantExpr( Constant( new OneType( emptyQualifiers ), "1" ) ) ); |
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100 | end = new ConstantExpr( Constant( new ZeroType( emptyQualifiers ), "0" ) ); |
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101 | cmp = new NameExpr( "?>=?" ); |
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102 | update = new NameExpr( "--?" ); |
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103 | } |
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104 | |
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105 | ObjectDecl *index = new ObjectDecl( indexName.newName(), DeclarationNode::StorageClasses(), LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), new SingleInit( begin, std::list<Expression*>() ) ); |
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106 | |
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107 | UntypedExpr *cond = new UntypedExpr( cmp ); |
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108 | cond->get_args().push_back( new VariableExpr( index ) ); |
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109 | cond->get_args().push_back( end ); |
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110 | |
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111 | UntypedExpr *inc = new UntypedExpr( update ); |
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112 | inc->get_args().push_back( new AddressExpr( new VariableExpr( index ) ) ); |
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113 | |
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114 | UntypedExpr *dstIndex = new UntypedExpr( new NameExpr( "?[?]" ) ); |
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115 | dstIndex->get_args().push_back( dstParam ); |
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116 | dstIndex->get_args().push_back( new VariableExpr( index ) ); |
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117 | dstParam = dstIndex; |
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118 | |
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119 | // srcParam must keep track of the array indices to build the |
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120 | // source parameter and/or array list initializer |
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121 | srcParam.addArrayIndex( new VariableExpr( index ), array->get_dimension()->clone() ); |
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122 | |
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123 | // for stmt's body, eventually containing call |
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124 | CompoundStmt * body = new CompoundStmt( noLabels ); |
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125 | Statement * listInit = genCall( srcParam, dstParam, fname, back_inserter( body->get_kids() ), array->get_base(), addCast, forward ); |
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126 | |
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127 | // block containing for stmt and index variable |
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128 | std::list<Statement *> initList; |
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129 | CompoundStmt * block = new CompoundStmt( noLabels ); |
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130 | block->get_kids().push_back( new DeclStmt( noLabels, index ) ); |
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131 | if ( listInit ) block->get_kids().push_back( listInit ); |
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132 | block->get_kids().push_back( new ForStmt( noLabels, initList, cond, inc, body ) ); |
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133 | |
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134 | *out++ = block; |
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135 | } |
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136 | |
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137 | template< typename OutputIterator > |
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138 | Statement * genCall( InitTweak::InitExpander & srcParam, Expression * dstParam, const std::string & fname, OutputIterator out, Type * type, bool addCast, bool forward ) { |
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139 | if ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) { |
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140 | genArrayCall( srcParam, dstParam, fname, out, at, addCast, forward ); |
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141 | return 0; |
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142 | } else { |
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143 | return genScalarCall( srcParam, dstParam, fname, out, type, addCast ); |
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144 | } |
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145 | } |
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146 | |
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147 | /// inserts into out a generated call expression to function fname with arguments dstParam |
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148 | /// and srcParam. Intended to be used with generated ?=?, ?{}, and ^?{} calls. decl is the |
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149 | /// object being constructed. The function wraps constructor and destructor calls in an |
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150 | /// ImplicitCtorDtorStmt node. |
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151 | template< typename OutputIterator > |
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152 | void genImplicitCall( InitTweak::InitExpander & srcParam, Expression * dstParam, const std::string & fname, OutputIterator out, DeclarationWithType * decl, bool forward = true ) { |
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153 | ObjectDecl *obj = dynamic_cast<ObjectDecl *>( decl ); |
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154 | assert( obj ); |
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155 | // unnamed bit fields are not copied as they cannot be accessed |
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156 | if ( isUnnamedBitfield( obj ) ) return; |
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157 | |
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158 | bool addCast = (fname == "?{}" || fname == "^?{}") && ( !obj || ( obj && obj->get_bitfieldWidth() == NULL ) ); |
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159 | std::list< Statement * > stmts; |
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160 | genCall( srcParam, dstParam, fname, back_inserter( stmts ), obj->get_type(), addCast, forward ); |
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161 | |
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162 | // currently genCall should produce at most one element, but if that changes then the next line needs to be updated to grab the statement which contains the call |
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163 | assert( stmts.size() <= 1 ); |
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164 | if ( stmts.size() == 1 ) { |
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165 | Statement * callStmt = stmts.front(); |
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166 | if ( addCast ) { |
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167 | // implicitly generated ctor/dtor calls should be wrapped |
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168 | // so that later passes are aware they were generated. |
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169 | // xxx - don't mark as an implicit ctor/dtor if obj is a bitfield, |
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170 | // because this causes the address to be taken at codegen, which is illegal in C. |
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171 | callStmt = new ImplicitCtorDtorStmt( callStmt ); |
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172 | } |
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173 | *out++ = callStmt; |
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174 | } |
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175 | } |
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176 | } // namespace SymTab |
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177 | #endif // AUTOGEN_H |
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