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 | // CodeGenerator.cc -- |
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8 | // |
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9 | // Author : Richard C. Bilson |
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10 | // Created On : Mon May 18 07:44:20 2015 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Thu Aug 4 13:35:30 2016 |
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13 | // Update Count : 352 |
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14 | // |
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15 | |
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16 | #include <algorithm> |
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17 | #include <iostream> |
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18 | #include <cassert> |
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19 | #include <list> |
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20 | |
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21 | #include "Parser/ParseNode.h" |
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22 | |
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23 | #include "SynTree/Declaration.h" |
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24 | #include "SynTree/Expression.h" |
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25 | #include "SynTree/Initializer.h" |
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26 | #include "SynTree/Statement.h" |
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27 | #include "SynTree/Type.h" |
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28 | #include "SynTree/Attribute.h" |
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29 | |
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30 | #include "Common/utility.h" |
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31 | #include "Common/UnimplementedError.h" |
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32 | |
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33 | #include "CodeGenerator.h" |
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34 | #include "OperatorTable.h" |
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35 | #include "GenType.h" |
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36 | |
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37 | #include "InitTweak/InitTweak.h" |
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38 | |
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39 | using namespace std; |
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40 | |
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41 | namespace CodeGen { |
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42 | int CodeGenerator::tabsize = 4; |
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43 | |
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44 | // the kinds of statements that would ideally be followed by whitespace |
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45 | bool wantSpacing( Statement * stmt) { |
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46 | return dynamic_cast< IfStmt * >( stmt ) || dynamic_cast< CompoundStmt * >( stmt ) || |
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47 | dynamic_cast< WhileStmt * >( stmt ) || dynamic_cast< ForStmt * >( stmt ) || dynamic_cast< SwitchStmt *>( stmt ); |
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48 | } |
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49 | |
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50 | void CodeGenerator::extension( Expression * expr ) { |
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51 | if ( expr->get_extension() ) { |
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52 | output << "__extension__ "; |
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53 | } // if |
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54 | } // extension |
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55 | |
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56 | void CodeGenerator::extension( Declaration * decl ) { |
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57 | if ( decl->get_extension() ) { |
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58 | output << "__extension__ "; |
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59 | } // if |
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60 | } // extension |
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61 | |
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62 | ostream & CodeGenerator::Indenter::operator()( ostream & output ) const { |
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63 | return output << string( cg.cur_indent, ' ' ); |
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64 | } |
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65 | |
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66 | ostream & operator<<( ostream & output, const CodeGenerator::Indenter &indent ) { |
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67 | return indent( output ); |
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68 | } |
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69 | |
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70 | CodeGenerator::LabelPrinter & CodeGenerator::LabelPrinter::operator()( std::list< Label > & l ) { |
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71 | labels = &l; |
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72 | return *this; |
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73 | } |
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74 | |
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75 | ostream & operator<<( ostream & output, CodeGenerator::LabelPrinter & printLabels ) { |
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76 | std::list< Label > & labs = *printLabels.labels; |
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77 | // l.unique(); // assumes a sorted list. Why not use set? Does order matter? |
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78 | for ( Label & l : labs ) { |
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79 | output << l.get_name() + ": "; |
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80 | printLabels.cg.genAttributes( l.get_attributes() ); |
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81 | } // for |
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82 | return output; |
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83 | } |
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84 | |
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85 | CodeGenerator::CodeGenerator( std::ostream & os ) : indent( *this), cur_indent( 0 ), insideFunction( false ), output( os ), printLabels( *this ) {} |
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86 | |
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87 | CodeGenerator::CodeGenerator( std::ostream & os, std::string init, int indentation, bool infunp ) |
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88 | : indent( *this), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( *this ) { |
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89 | //output << std::string( init ); |
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90 | } |
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91 | |
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92 | CodeGenerator::CodeGenerator( std::ostream & os, char * init, int indentation, bool infunp ) |
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93 | : indent( *this ), cur_indent( indentation ), insideFunction( infunp ), output( os ), printLabels( *this ) { |
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94 | //output << std::string( init ); |
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95 | } |
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96 | |
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97 | string mangleName( DeclarationWithType * decl ) { |
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98 | if ( decl->get_mangleName() != "" ) { |
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99 | // need to incorporate scope level in order to differentiate names for destructors |
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100 | return decl->get_scopedMangleName(); |
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101 | } else { |
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102 | return decl->get_name(); |
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103 | } // if |
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104 | } |
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105 | |
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106 | void CodeGenerator::genAttributes( std::list< Attribute * > & attributes ) { |
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107 | if ( ! attributes.empty() ) { |
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108 | output << "__attribute__ (("; |
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109 | for ( Attribute *& attr : attributes ) { |
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110 | if ( ! attr->empty() ) { |
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111 | output << attr->get_name() << "("; |
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112 | genCommaList( attr->get_parameters().begin(), attr->get_parameters().end() ); |
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113 | output << ")"; |
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114 | } // if |
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115 | output << ","; |
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116 | } // for |
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117 | output << ")) "; |
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118 | } // if |
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119 | } |
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120 | |
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121 | |
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122 | //*** Declarations |
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123 | void CodeGenerator::visit( FunctionDecl * functionDecl ) { |
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124 | extension( functionDecl ); |
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125 | genAttributes( functionDecl->get_attributes() ); |
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126 | |
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127 | handleStorageClass( functionDecl ); |
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128 | if ( functionDecl->get_isInline() ) { |
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129 | output << "inline "; |
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130 | } // if |
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131 | if ( functionDecl->get_isNoreturn() ) { |
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132 | output << "_Noreturn "; |
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133 | } // if |
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134 | output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) ); |
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135 | |
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136 | // how to get this to the Functype? |
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137 | std::list< Declaration * > olds = functionDecl->get_oldDecls(); |
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138 | if ( ! olds.empty() ) { |
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139 | output << " /* function has old declaration */"; |
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140 | } // if |
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141 | |
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142 | // acceptAll( functionDecl->get_oldDecls(), *this ); |
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143 | if ( functionDecl->get_statements() ) { |
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144 | functionDecl->get_statements()->accept( *this ); |
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145 | } // if |
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146 | } |
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147 | |
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148 | void CodeGenerator::visit( ObjectDecl * objectDecl ) { |
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149 | extension( objectDecl ); |
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150 | genAttributes( objectDecl->get_attributes() ); |
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151 | |
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152 | handleStorageClass( objectDecl ); |
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153 | output << genType( objectDecl->get_type(), mangleName( objectDecl ) ); |
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154 | |
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155 | if ( objectDecl->get_init() ) { |
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156 | output << " = "; |
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157 | objectDecl->get_init()->accept( *this ); |
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158 | } // if |
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159 | |
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160 | if ( objectDecl->get_bitfieldWidth() ) { |
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161 | output << ":"; |
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162 | objectDecl->get_bitfieldWidth()->accept( *this ); |
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163 | } // if |
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164 | } |
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165 | |
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166 | void CodeGenerator::handleAggregate( AggregateDecl * aggDecl ) { |
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167 | if ( aggDecl->get_name() != "" ) |
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168 | output << aggDecl->get_name(); |
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169 | |
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170 | std::list< Declaration * > & memb = aggDecl->get_members(); |
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171 | if ( ! memb.empty() ) { |
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172 | // if ( aggDecl->has_body() ) { |
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173 | // std::list< Declaration * > & memb = aggDecl->get_members(); |
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174 | output << " {" << endl; |
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175 | |
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176 | cur_indent += CodeGenerator::tabsize; |
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177 | for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++ ) { |
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178 | output << indent; |
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179 | (*i)->accept( *this ); |
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180 | output << ";" << endl; |
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181 | } // for |
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182 | |
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183 | cur_indent -= CodeGenerator::tabsize; |
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184 | |
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185 | output << indent << "}"; |
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186 | } // if |
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187 | } |
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188 | |
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189 | void CodeGenerator::visit( StructDecl * structDecl ) { |
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190 | extension( structDecl ); |
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191 | output << "struct "; |
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192 | handleAggregate( structDecl ); |
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193 | } |
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194 | |
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195 | void CodeGenerator::visit( UnionDecl * unionDecl ) { |
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196 | extension( unionDecl ); |
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197 | output << "union "; |
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198 | handleAggregate( unionDecl ); |
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199 | } |
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200 | |
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201 | void CodeGenerator::visit( EnumDecl * enumDecl ) { |
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202 | extension( enumDecl ); |
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203 | output << "enum "; |
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204 | |
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205 | if ( enumDecl->get_name() != "" ) |
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206 | output << enumDecl->get_name(); |
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207 | |
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208 | std::list< Declaration* > &memb = enumDecl->get_members(); |
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209 | |
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210 | if ( ! memb.empty() ) { |
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211 | output << " {" << endl; |
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212 | |
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213 | cur_indent += CodeGenerator::tabsize; |
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214 | for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) { |
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215 | ObjectDecl * obj = dynamic_cast< ObjectDecl* >( *i ); |
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216 | assert( obj ); |
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217 | output << indent << mangleName( obj ); |
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218 | if ( obj->get_init() ) { |
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219 | output << " = "; |
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220 | obj->get_init()->accept( *this ); |
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221 | } // if |
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222 | output << "," << endl; |
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223 | } // for |
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224 | |
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225 | cur_indent -= CodeGenerator::tabsize; |
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226 | |
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227 | output << indent << "}"; |
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228 | } // if |
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229 | } |
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230 | |
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231 | void CodeGenerator::visit( TraitDecl * traitDecl ) {} |
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232 | |
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233 | void CodeGenerator::visit( TypedefDecl * typeDecl ) { |
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234 | assert( false && "Typedefs are removed and substituted in earlier passes." ); |
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235 | //output << "typedef "; |
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236 | //output << genType( typeDecl->get_base(), typeDecl->get_name() ); |
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237 | } |
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238 | |
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239 | void CodeGenerator::visit( TypeDecl * typeDecl ) { |
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240 | // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes, |
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241 | // still to be done |
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242 | extension( typeDecl ); |
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243 | output << "extern unsigned long " << typeDecl->get_name(); |
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244 | if ( typeDecl->get_base() ) { |
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245 | output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )"; |
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246 | } // if |
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247 | } |
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248 | |
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249 | void CodeGenerator::printDesignators( std::list< Expression * > & designators ) { |
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250 | typedef std::list< Expression * > DesignatorList; |
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251 | if ( designators.size() == 0 ) return; |
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252 | for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) { |
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253 | if ( dynamic_cast< NameExpr * >( *iter ) ) { |
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254 | // if expression is a name, then initializing aggregate member |
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255 | output << "."; |
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256 | (*iter)->accept( *this ); |
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257 | } else { |
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258 | // if not a simple name, it has to be a constant expression, i.e. an array designator |
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259 | output << "["; |
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260 | (*iter)->accept( *this ); |
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261 | output << "]"; |
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262 | } // if |
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263 | } // for |
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264 | output << " = "; |
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265 | } |
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266 | |
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267 | void CodeGenerator::visit( SingleInit * init ) { |
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268 | printDesignators( init->get_designators() ); |
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269 | init->get_value()->accept( *this ); |
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270 | } |
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271 | |
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272 | void CodeGenerator::visit( ListInit * init ) { |
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273 | printDesignators( init->get_designators() ); |
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274 | output << "{ "; |
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275 | if ( init->begin() == init->end() ) { |
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276 | // illegal to leave initializer list empty for scalar initializers, but always legal to have 0 |
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277 | output << "0"; |
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278 | } else { |
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279 | genCommaList( init->begin(), init->end() ); |
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280 | } // if |
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281 | output << " }"; |
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282 | } |
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283 | |
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284 | void CodeGenerator::visit( Constant * constant ) { |
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285 | output << constant->get_value() ; |
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286 | } |
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287 | |
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288 | //*** Expressions |
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289 | void CodeGenerator::visit( ApplicationExpr * applicationExpr ) { |
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290 | extension( applicationExpr ); |
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291 | if ( VariableExpr * varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) { |
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292 | OperatorInfo opInfo; |
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293 | if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) { |
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294 | std::list< Expression* >::iterator arg = applicationExpr->get_args().begin(); |
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295 | switch ( opInfo.type ) { |
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296 | case OT_PREFIXASSIGN: |
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297 | case OT_POSTFIXASSIGN: |
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298 | case OT_INFIXASSIGN: |
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299 | case OT_CTOR: |
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300 | case OT_DTOR: |
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301 | { |
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302 | assert( arg != applicationExpr->get_args().end() ); |
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303 | if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) { |
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304 | // remove & from first assignment/ctor argument |
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305 | *arg = addrExpr->get_arg(); |
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306 | } else { |
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307 | // no address-of operator, so must be a pointer - add dereference |
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308 | UntypedExpr * newExpr = new UntypedExpr( new NameExpr( "*?" ) ); |
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309 | newExpr->get_args().push_back( *arg ); |
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310 | assert( (*arg)->get_results().size() == 1 ); |
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311 | Type * type = InitTweak::getPointerBase( (*arg)->get_results().front() ); |
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312 | assert( type ); |
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313 | newExpr->get_results().push_back( type->clone() ); |
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314 | *arg = newExpr; |
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315 | } // if |
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316 | break; |
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317 | } |
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318 | |
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319 | default: |
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320 | // do nothing |
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321 | ; |
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322 | } // switch |
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323 | |
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324 | switch ( opInfo.type ) { |
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325 | case OT_INDEX: |
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326 | assert( applicationExpr->get_args().size() == 2 ); |
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327 | (*arg++)->accept( *this ); |
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328 | output << "["; |
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329 | (*arg)->accept( *this ); |
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330 | output << "]"; |
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331 | break; |
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332 | |
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333 | case OT_CALL: |
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334 | // there are no intrinsic definitions of the function call operator |
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335 | assert( false ); |
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336 | break; |
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337 | |
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338 | case OT_CTOR: |
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339 | case OT_DTOR: |
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340 | if ( applicationExpr->get_args().size() == 1 ) { |
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341 | // the expression fed into a single parameter constructor or destructor may contain side |
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342 | // effects, so must still output this expression |
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343 | output << "("; |
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344 | (*arg++)->accept( *this ); |
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345 | output << ") /* " << opInfo.inputName << " */"; |
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346 | } else if ( applicationExpr->get_args().size() == 2 ) { |
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347 | // intrinsic two parameter constructors are essentially bitwise assignment |
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348 | output << "("; |
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349 | (*arg++)->accept( *this ); |
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350 | output << opInfo.symbol; |
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351 | (*arg)->accept( *this ); |
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352 | output << ") /* " << opInfo.inputName << " */"; |
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353 | } else { |
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354 | // no constructors with 0 or more than 2 parameters |
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355 | assert( false ); |
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356 | } // if |
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357 | break; |
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358 | |
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359 | case OT_PREFIX: |
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360 | case OT_PREFIXASSIGN: |
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361 | assert( applicationExpr->get_args().size() == 1 ); |
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362 | output << "("; |
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363 | output << opInfo.symbol; |
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364 | (*arg)->accept( *this ); |
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365 | output << ")"; |
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366 | break; |
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367 | |
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368 | case OT_POSTFIX: |
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369 | case OT_POSTFIXASSIGN: |
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370 | assert( applicationExpr->get_args().size() == 1 ); |
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371 | (*arg)->accept( *this ); |
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372 | output << opInfo.symbol; |
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373 | break; |
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374 | |
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375 | |
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376 | case OT_INFIX: |
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377 | case OT_INFIXASSIGN: |
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378 | assert( applicationExpr->get_args().size() == 2 ); |
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379 | output << "("; |
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380 | (*arg++)->accept( *this ); |
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381 | output << opInfo.symbol; |
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382 | (*arg)->accept( *this ); |
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383 | output << ")"; |
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384 | break; |
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385 | |
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386 | case OT_CONSTANT: |
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387 | case OT_LABELADDRESS: |
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388 | // there are no intrinsic definitions of 0/1 or label addresses as functions |
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389 | assert( false ); |
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390 | } // switch |
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391 | } else { |
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392 | varExpr->accept( *this ); |
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393 | output << "("; |
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394 | genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() ); |
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395 | output << ")"; |
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396 | } // if |
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397 | } else { |
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398 | applicationExpr->get_function()->accept( *this ); |
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399 | output << "("; |
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400 | genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() ); |
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401 | output << ")"; |
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402 | } // if |
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403 | } |
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404 | |
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405 | void CodeGenerator::visit( UntypedExpr * untypedExpr ) { |
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406 | extension( untypedExpr ); |
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407 | if ( NameExpr * nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) { |
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408 | OperatorInfo opInfo; |
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409 | if ( operatorLookup( nameExpr->get_name(), opInfo ) ) { |
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410 | std::list< Expression* >::iterator arg = untypedExpr->get_args().begin(); |
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411 | switch ( opInfo.type ) { |
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412 | case OT_INDEX: |
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413 | assert( untypedExpr->get_args().size() == 2 ); |
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414 | (*arg++)->accept( *this ); |
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415 | output << "["; |
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416 | (*arg)->accept( *this ); |
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417 | output << "]"; |
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418 | break; |
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419 | |
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420 | case OT_CALL: |
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421 | assert( false ); |
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422 | |
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423 | case OT_CTOR: |
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424 | case OT_DTOR: |
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425 | if ( untypedExpr->get_args().size() == 1 ) { |
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426 | // the expression fed into a single parameter constructor or destructor may contain side |
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427 | // effects, so must still output this expression |
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428 | output << "("; |
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429 | (*arg++)->accept( *this ); |
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430 | output << ") /* " << opInfo.inputName << " */"; |
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431 | } else if ( untypedExpr->get_args().size() == 2 ) { |
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432 | // intrinsic two parameter constructors are essentially bitwise assignment |
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433 | output << "("; |
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434 | (*arg++)->accept( *this ); |
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435 | output << opInfo.symbol; |
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436 | (*arg)->accept( *this ); |
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437 | output << ") /* " << opInfo.inputName << " */"; |
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438 | } else { |
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439 | // no constructors with 0 or more than 2 parameters |
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440 | assert( false ); |
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441 | } // if |
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442 | break; |
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443 | |
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444 | case OT_PREFIX: |
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445 | case OT_PREFIXASSIGN: |
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446 | case OT_LABELADDRESS: |
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447 | assert( untypedExpr->get_args().size() == 1 ); |
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448 | output << "("; |
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449 | output << opInfo.symbol; |
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450 | (*arg)->accept( *this ); |
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451 | output << ")"; |
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452 | break; |
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453 | |
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454 | case OT_POSTFIX: |
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455 | case OT_POSTFIXASSIGN: |
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456 | assert( untypedExpr->get_args().size() == 1 ); |
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457 | (*arg)->accept( *this ); |
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458 | output << opInfo.symbol; |
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459 | break; |
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460 | |
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461 | case OT_INFIX: |
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462 | case OT_INFIXASSIGN: |
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463 | assert( untypedExpr->get_args().size() == 2 ); |
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464 | output << "("; |
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465 | (*arg++)->accept( *this ); |
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466 | output << opInfo.symbol; |
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467 | (*arg)->accept( *this ); |
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468 | output << ")"; |
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469 | break; |
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470 | |
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471 | case OT_CONSTANT: |
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472 | // there are no intrinsic definitions of 0 or 1 as functions |
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473 | assert( false ); |
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474 | } // switch |
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475 | } else { |
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476 | if ( nameExpr->get_name() == "..." ) { // case V1 ... V2 or case V1~V2 |
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477 | assert( untypedExpr->get_args().size() == 2 ); |
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478 | (*untypedExpr->get_args().begin())->accept( *this ); |
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479 | output << " ... "; |
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480 | (*--untypedExpr->get_args().end())->accept( *this ); |
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481 | } else { // builtin routines |
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482 | nameExpr->accept( *this ); |
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483 | output << "("; |
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484 | genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() ); |
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485 | output << ")"; |
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486 | } // if |
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487 | } // if |
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488 | } else { |
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489 | untypedExpr->get_function()->accept( *this ); |
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490 | output << "("; |
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491 | genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() ); |
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492 | output << ")"; |
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493 | } // if |
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494 | } |
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495 | |
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496 | void CodeGenerator::visit( RangeExpr * rangeExpr ) { |
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497 | rangeExpr->get_low()->accept( *this ); |
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498 | output << " ... "; |
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499 | rangeExpr->get_high()->accept( *this ); |
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500 | } |
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501 | |
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502 | void CodeGenerator::visit( NameExpr * nameExpr ) { |
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503 | extension( nameExpr ); |
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504 | OperatorInfo opInfo; |
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505 | if ( operatorLookup( nameExpr->get_name(), opInfo ) ) { |
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506 | assert( opInfo.type == OT_CONSTANT ); |
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507 | output << opInfo.symbol; |
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508 | } else { |
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509 | output << nameExpr->get_name(); |
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510 | } // if |
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511 | } |
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512 | |
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513 | void CodeGenerator::visit( AddressExpr * addressExpr ) { |
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514 | extension( addressExpr ); |
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515 | output << "(&"; |
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516 | // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address |
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517 | if ( VariableExpr * variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) { |
---|
518 | output << mangleName( variableExpr->get_var() ); |
---|
519 | } else { |
---|
520 | addressExpr->get_arg()->accept( *this ); |
---|
521 | } // if |
---|
522 | output << ")"; |
---|
523 | } |
---|
524 | |
---|
525 | void CodeGenerator::visit( CastExpr * castExpr ) { |
---|
526 | extension( castExpr ); |
---|
527 | output << "("; |
---|
528 | if ( castExpr->get_results().empty() ) { |
---|
529 | output << "(void)" ; |
---|
530 | } else if ( ! castExpr->get_results().front()->get_isLvalue() ) { |
---|
531 | // at least one result type of cast, but not an lvalue |
---|
532 | output << "("; |
---|
533 | output << genType( castExpr->get_results().front(), "" ); |
---|
534 | output << ")"; |
---|
535 | } else { |
---|
536 | // otherwise, the cast is to an lvalue type, so the cast should be dropped, since the result of a cast is |
---|
537 | // never an lvalue in C |
---|
538 | } // if |
---|
539 | castExpr->get_arg()->accept( *this ); |
---|
540 | output << ")"; |
---|
541 | } |
---|
542 | |
---|
543 | void CodeGenerator::visit( UntypedMemberExpr * memberExpr ) { |
---|
544 | assert( false ); |
---|
545 | } |
---|
546 | |
---|
547 | void CodeGenerator::visit( MemberExpr * memberExpr ) { |
---|
548 | extension( memberExpr ); |
---|
549 | memberExpr->get_aggregate()->accept( *this ); |
---|
550 | output << "." << mangleName( memberExpr->get_member() ); |
---|
551 | } |
---|
552 | |
---|
553 | void CodeGenerator::visit( VariableExpr * variableExpr ) { |
---|
554 | extension( variableExpr ); |
---|
555 | OperatorInfo opInfo; |
---|
556 | if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) { |
---|
557 | output << opInfo.symbol; |
---|
558 | } else { |
---|
559 | output << mangleName( variableExpr->get_var() ); |
---|
560 | } // if |
---|
561 | } |
---|
562 | |
---|
563 | void CodeGenerator::visit( ConstantExpr * constantExpr ) { |
---|
564 | assert( constantExpr->get_constant() ); |
---|
565 | extension( constantExpr ); |
---|
566 | constantExpr->get_constant()->accept( *this ); |
---|
567 | } |
---|
568 | |
---|
569 | void CodeGenerator::visit( SizeofExpr * sizeofExpr ) { |
---|
570 | extension( sizeofExpr ); |
---|
571 | output << "sizeof("; |
---|
572 | if ( sizeofExpr->get_isType() ) { |
---|
573 | output << genType( sizeofExpr->get_type(), "" ); |
---|
574 | } else { |
---|
575 | sizeofExpr->get_expr()->accept( *this ); |
---|
576 | } // if |
---|
577 | output << ")"; |
---|
578 | } |
---|
579 | |
---|
580 | void CodeGenerator::visit( AlignofExpr * alignofExpr ) { |
---|
581 | // use GCC extension to avoid bumping std to C11 |
---|
582 | extension( alignofExpr ); |
---|
583 | output << "__alignof__("; |
---|
584 | if ( alignofExpr->get_isType() ) { |
---|
585 | output << genType( alignofExpr->get_type(), "" ); |
---|
586 | } else { |
---|
587 | alignofExpr->get_expr()->accept( *this ); |
---|
588 | } // if |
---|
589 | output << ")"; |
---|
590 | } |
---|
591 | |
---|
592 | void CodeGenerator::visit( UntypedOffsetofExpr * offsetofExpr ) { |
---|
593 | assert( false && "UntypedOffsetofExpr should not reach code generation." ); |
---|
594 | } |
---|
595 | |
---|
596 | void CodeGenerator::visit( OffsetofExpr * offsetofExpr ) { |
---|
597 | // use GCC builtin |
---|
598 | output << "__builtin_offsetof("; |
---|
599 | output << genType( offsetofExpr->get_type(), "" ); |
---|
600 | output << ", " << mangleName( offsetofExpr->get_member() ); |
---|
601 | output << ")"; |
---|
602 | } |
---|
603 | |
---|
604 | void CodeGenerator::visit( OffsetPackExpr * offsetPackExpr ) { |
---|
605 | assert( false && "OffsetPackExpr should not reach code generation." ); |
---|
606 | } |
---|
607 | |
---|
608 | void CodeGenerator::visit( LogicalExpr * logicalExpr ) { |
---|
609 | extension( logicalExpr ); |
---|
610 | output << "("; |
---|
611 | logicalExpr->get_arg1()->accept( *this ); |
---|
612 | if ( logicalExpr->get_isAnd() ) { |
---|
613 | output << " && "; |
---|
614 | } else { |
---|
615 | output << " || "; |
---|
616 | } // if |
---|
617 | logicalExpr->get_arg2()->accept( *this ); |
---|
618 | output << ")"; |
---|
619 | } |
---|
620 | |
---|
621 | void CodeGenerator::visit( ConditionalExpr * conditionalExpr ) { |
---|
622 | extension( conditionalExpr ); |
---|
623 | output << "("; |
---|
624 | conditionalExpr->get_arg1()->accept( *this ); |
---|
625 | output << " ? "; |
---|
626 | conditionalExpr->get_arg2()->accept( *this ); |
---|
627 | output << " : "; |
---|
628 | conditionalExpr->get_arg3()->accept( *this ); |
---|
629 | output << ")"; |
---|
630 | } |
---|
631 | |
---|
632 | void CodeGenerator::visit( CommaExpr * commaExpr ) { |
---|
633 | extension( commaExpr ); |
---|
634 | output << "("; |
---|
635 | commaExpr->get_arg1()->accept( *this ); |
---|
636 | output << " , "; |
---|
637 | commaExpr->get_arg2()->accept( *this ); |
---|
638 | output << ")"; |
---|
639 | } |
---|
640 | |
---|
641 | void CodeGenerator::visit( TupleExpr * tupleExpr ) {} |
---|
642 | |
---|
643 | void CodeGenerator::visit( TypeExpr * typeExpr ) {} |
---|
644 | |
---|
645 | void CodeGenerator::visit( AsmExpr * asmExpr ) { |
---|
646 | if ( asmExpr->get_inout() ) { |
---|
647 | output << "[ "; |
---|
648 | asmExpr->get_inout()->accept( *this ); |
---|
649 | output << " ] "; |
---|
650 | } // if |
---|
651 | asmExpr->get_constraint()->accept( *this ); |
---|
652 | output << " ( "; |
---|
653 | asmExpr->get_operand()->accept( *this ); |
---|
654 | output << " )"; |
---|
655 | } |
---|
656 | |
---|
657 | //*** Statements |
---|
658 | void CodeGenerator::visit( CompoundStmt * compoundStmt ) { |
---|
659 | std::list<Statement*> ks = compoundStmt->get_kids(); |
---|
660 | output << "{" << endl; |
---|
661 | |
---|
662 | cur_indent += CodeGenerator::tabsize; |
---|
663 | |
---|
664 | for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) { |
---|
665 | output << indent << printLabels( (*i)->get_labels() ); |
---|
666 | (*i)->accept( *this ); |
---|
667 | |
---|
668 | output << endl; |
---|
669 | if ( wantSpacing( *i ) ) { |
---|
670 | output << endl; |
---|
671 | } // if |
---|
672 | } // for |
---|
673 | cur_indent -= CodeGenerator::tabsize; |
---|
674 | |
---|
675 | output << indent << "}"; |
---|
676 | } |
---|
677 | |
---|
678 | void CodeGenerator::visit( ExprStmt * exprStmt ) { |
---|
679 | assert( exprStmt ); |
---|
680 | // cast the top-level expression to void to reduce gcc warnings. |
---|
681 | Expression * expr = new CastExpr( exprStmt->get_expr() ); |
---|
682 | expr->accept( *this ); |
---|
683 | output << ";"; |
---|
684 | } |
---|
685 | |
---|
686 | void CodeGenerator::visit( AsmStmt * asmStmt ) { |
---|
687 | output << "asm "; |
---|
688 | if ( asmStmt->get_voltile() ) output << "volatile "; |
---|
689 | if ( ! asmStmt->get_gotolabels().empty() ) output << "goto "; |
---|
690 | output << "( "; |
---|
691 | if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this ); |
---|
692 | output << " : "; |
---|
693 | genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() ); |
---|
694 | output << " : "; |
---|
695 | genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() ); |
---|
696 | output << " : "; |
---|
697 | genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() ); |
---|
698 | if ( ! asmStmt->get_gotolabels().empty() ) { |
---|
699 | output << " : "; |
---|
700 | for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) { |
---|
701 | output << *begin++; |
---|
702 | if ( begin == asmStmt->get_gotolabels().end() ) break; |
---|
703 | output << ", "; |
---|
704 | } // for |
---|
705 | } // if |
---|
706 | output << " );" ; |
---|
707 | } |
---|
708 | |
---|
709 | void CodeGenerator::visit( IfStmt * ifStmt ) { |
---|
710 | output << "if ( "; |
---|
711 | ifStmt->get_condition()->accept( *this ); |
---|
712 | output << " ) "; |
---|
713 | |
---|
714 | ifStmt->get_thenPart()->accept( *this ); |
---|
715 | |
---|
716 | if ( ifStmt->get_elsePart() != 0) { |
---|
717 | output << " else "; |
---|
718 | ifStmt->get_elsePart()->accept( *this ); |
---|
719 | } // if |
---|
720 | } |
---|
721 | |
---|
722 | void CodeGenerator::visit( SwitchStmt * switchStmt ) { |
---|
723 | output << "switch ( " ; |
---|
724 | switchStmt->get_condition()->accept( *this ); |
---|
725 | output << " ) "; |
---|
726 | |
---|
727 | output << "{" << std::endl; |
---|
728 | cur_indent += CodeGenerator::tabsize; |
---|
729 | acceptAll( switchStmt->get_statements(), *this ); |
---|
730 | cur_indent -= CodeGenerator::tabsize; |
---|
731 | output << indent << "}"; |
---|
732 | } |
---|
733 | |
---|
734 | void CodeGenerator::visit( CaseStmt * caseStmt ) { |
---|
735 | output << indent; |
---|
736 | if ( caseStmt->isDefault()) { |
---|
737 | output << "default"; |
---|
738 | } else { |
---|
739 | output << "case "; |
---|
740 | caseStmt->get_condition()->accept( *this ); |
---|
741 | } // if |
---|
742 | output << ":\n"; |
---|
743 | |
---|
744 | std::list<Statement *> sts = caseStmt->get_statements(); |
---|
745 | |
---|
746 | cur_indent += CodeGenerator::tabsize; |
---|
747 | for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) { |
---|
748 | output << indent << printLabels( (*i)->get_labels() ) ; |
---|
749 | (*i)->accept( *this ); |
---|
750 | output << endl; |
---|
751 | } // for |
---|
752 | cur_indent -= CodeGenerator::tabsize; |
---|
753 | } |
---|
754 | |
---|
755 | void CodeGenerator::visit( BranchStmt * branchStmt ) { |
---|
756 | switch ( branchStmt->get_type()) { |
---|
757 | case BranchStmt::Goto: |
---|
758 | if ( ! branchStmt->get_target().empty() ) |
---|
759 | output << "goto " << branchStmt->get_target(); |
---|
760 | else { |
---|
761 | if ( branchStmt->get_computedTarget() != 0 ) { |
---|
762 | output << "goto *"; |
---|
763 | branchStmt->get_computedTarget()->accept( *this ); |
---|
764 | } // if |
---|
765 | } // if |
---|
766 | break; |
---|
767 | case BranchStmt::Break: |
---|
768 | output << "break"; |
---|
769 | break; |
---|
770 | case BranchStmt::Continue: |
---|
771 | output << "continue"; |
---|
772 | break; |
---|
773 | } // switch |
---|
774 | output << ";"; |
---|
775 | } |
---|
776 | |
---|
777 | |
---|
778 | void CodeGenerator::visit( ReturnStmt * returnStmt ) { |
---|
779 | output << "return "; |
---|
780 | maybeAccept( returnStmt->get_expr(), *this ); |
---|
781 | output << ";"; |
---|
782 | } |
---|
783 | |
---|
784 | void CodeGenerator::visit( WhileStmt * whileStmt ) { |
---|
785 | if ( whileStmt->get_isDoWhile() ) { |
---|
786 | output << "do" ; |
---|
787 | } else { |
---|
788 | output << "while (" ; |
---|
789 | whileStmt->get_condition()->accept( *this ); |
---|
790 | output << ")"; |
---|
791 | } // if |
---|
792 | output << " "; |
---|
793 | |
---|
794 | output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() ); |
---|
795 | whileStmt->get_body()->accept( *this ); |
---|
796 | |
---|
797 | output << indent; |
---|
798 | |
---|
799 | if ( whileStmt->get_isDoWhile() ) { |
---|
800 | output << " while (" ; |
---|
801 | whileStmt->get_condition()->accept( *this ); |
---|
802 | output << ");"; |
---|
803 | } // if |
---|
804 | } |
---|
805 | |
---|
806 | void CodeGenerator::visit( ForStmt * forStmt ) { |
---|
807 | // initialization is always hoisted, so don't bother doing anything with that |
---|
808 | output << "for (;"; |
---|
809 | |
---|
810 | if ( forStmt->get_condition() != 0 ) { |
---|
811 | forStmt->get_condition()->accept( *this ); |
---|
812 | } // if |
---|
813 | output << ";"; |
---|
814 | |
---|
815 | if ( forStmt->get_increment() != 0 ) { |
---|
816 | // cast the top-level expression to void to reduce gcc warnings. |
---|
817 | Expression * expr = new CastExpr( forStmt->get_increment() ); |
---|
818 | expr->accept( *this ); |
---|
819 | } // if |
---|
820 | output << ") "; |
---|
821 | |
---|
822 | if ( forStmt->get_body() != 0 ) { |
---|
823 | output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() ); |
---|
824 | forStmt->get_body()->accept( *this ); |
---|
825 | } // if |
---|
826 | } |
---|
827 | |
---|
828 | void CodeGenerator::visit( NullStmt * nullStmt ) { |
---|
829 | //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() ); |
---|
830 | output << "/* null statement */ ;"; |
---|
831 | } |
---|
832 | |
---|
833 | void CodeGenerator::visit( DeclStmt * declStmt ) { |
---|
834 | declStmt->get_decl()->accept( *this ); |
---|
835 | |
---|
836 | if ( doSemicolon( declStmt->get_decl() ) ) { |
---|
837 | output << ";"; |
---|
838 | } // if |
---|
839 | } |
---|
840 | |
---|
841 | void CodeGenerator::handleStorageClass( Declaration * decl ) { |
---|
842 | switch ( decl->get_storageClass() ) { |
---|
843 | case DeclarationNode::Extern: |
---|
844 | output << "extern "; |
---|
845 | break; |
---|
846 | case DeclarationNode::Static: |
---|
847 | output << "static "; |
---|
848 | break; |
---|
849 | case DeclarationNode::Auto: |
---|
850 | // silently drop storage class |
---|
851 | break; |
---|
852 | case DeclarationNode::Register: |
---|
853 | output << "register "; |
---|
854 | break; |
---|
855 | case DeclarationNode::Inline: |
---|
856 | output << "inline "; |
---|
857 | break; |
---|
858 | case DeclarationNode::Fortran: |
---|
859 | output << "fortran "; |
---|
860 | break; |
---|
861 | case DeclarationNode::Noreturn: |
---|
862 | output << "_Noreturn "; |
---|
863 | break; |
---|
864 | case DeclarationNode::Threadlocal: |
---|
865 | output << "_Thread_local "; |
---|
866 | break; |
---|
867 | case DeclarationNode::NoStorageClass: |
---|
868 | break; |
---|
869 | } // switch |
---|
870 | } |
---|
871 | } // namespace CodeGen |
---|
872 | |
---|
873 | // Local Variables: // |
---|
874 | // tab-width: 4 // |
---|
875 | // mode: c++ // |
---|
876 | // compile-command: "make install" // |
---|
877 | // End: // |
---|