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 : Rob Schluntz |
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12 | // Last Modified On : Thu Sep 17 15:25:58 2015 |
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13 | // Update Count : 233 |
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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/Type.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 | |
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28 | #include "utility.h" |
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29 | #include "UnimplementedError.h" |
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30 | |
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31 | #include "CodeGenerator.h" |
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32 | #include "OperatorTable.h" |
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33 | #include "GenType.h" |
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34 | |
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35 | using namespace std; |
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36 | |
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37 | namespace CodeGen { |
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38 | int CodeGenerator::tabsize = 4; |
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39 | |
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40 | // the kinds of statements that would ideally be followed by whitespace |
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41 | bool wantSpacing( Statement * stmt) { |
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42 | return dynamic_cast< IfStmt * >( stmt ) || dynamic_cast< CompoundStmt * >( stmt ) || |
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43 | dynamic_cast< WhileStmt * >( stmt ) || dynamic_cast< ForStmt * > ( stmt ) || dynamic_cast< SwitchStmt *>( stmt ); |
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44 | } |
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45 | |
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46 | ostream & CodeGenerator::Indenter::operator()( ostream & output ) { |
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47 | return output << string( cg.cur_indent, ' ' ); |
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48 | } |
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49 | |
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50 | ostream & operator<<( ostream & output, CodeGenerator::Indenter &indent ) { |
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51 | return indent( output ); |
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52 | } |
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53 | |
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54 | CodeGenerator::CodeGenerator( std::ostream &os ) : indent( *this), cur_indent( 0 ), insideFunction( false ), output( os ) { } |
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55 | |
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56 | CodeGenerator::CodeGenerator( std::ostream &os, std::string init, int indentation, bool infunp ) |
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57 | : indent( *this), cur_indent( indentation ), insideFunction( infunp ), output( os ) { |
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58 | //output << std::string( init ); |
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59 | } |
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60 | |
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61 | CodeGenerator::CodeGenerator( std::ostream &os, char *init, int indentation, bool infunp ) |
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62 | : indent( *this ), cur_indent( indentation ), insideFunction( infunp ), output( os ) { |
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63 | //output << std::string( init ); |
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64 | } |
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65 | |
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66 | string mangleName( DeclarationWithType *decl ) { |
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67 | if ( decl->get_mangleName() != "" ) { |
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68 | return decl->get_mangleName(); |
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69 | } else { |
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70 | return decl->get_name(); |
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71 | } // if |
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72 | } |
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73 | |
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74 | //*** Declarations |
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75 | void CodeGenerator::visit( FunctionDecl *functionDecl ) { |
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76 | handleStorageClass( functionDecl ); |
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77 | if ( functionDecl->get_isInline() ) { |
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78 | output << "inline "; |
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79 | } // if |
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80 | if ( functionDecl->get_isNoreturn() ) { |
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81 | output << "_Noreturn "; |
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82 | } // if |
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83 | output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) ); |
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84 | |
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85 | // how to get this to the Functype? |
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86 | std::list< Declaration * > olds = functionDecl->get_oldDecls(); |
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87 | if ( ! olds.empty() ) { |
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88 | output << " /* function has old declaration */"; |
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89 | } // if |
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90 | |
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91 | // acceptAll( functionDecl->get_oldDecls(), *this ); |
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92 | if ( functionDecl->get_statements() ) { |
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93 | functionDecl->get_statements()->accept( *this ); |
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94 | } // if |
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95 | } |
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96 | |
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97 | void CodeGenerator::visit( ObjectDecl *objectDecl ) { |
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98 | handleStorageClass( objectDecl ); |
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99 | output << genType( objectDecl->get_type(), mangleName( objectDecl ) ); |
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100 | |
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101 | if ( objectDecl->get_init() ) { |
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102 | output << " = "; |
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103 | objectDecl->get_init()->accept( *this ); |
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104 | } // if |
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105 | if ( objectDecl->get_bitfieldWidth() ) { |
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106 | output << ":"; |
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107 | objectDecl->get_bitfieldWidth()->accept( *this ); |
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108 | } // if |
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109 | } |
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110 | |
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111 | void CodeGenerator::handleAggregate( AggregateDecl *aggDecl ) { |
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112 | if ( aggDecl->get_name() != "" ) |
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113 | output << aggDecl->get_name(); |
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114 | |
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115 | std::list< Declaration * > &memb = aggDecl->get_members(); |
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116 | |
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117 | if ( ! memb.empty() ) { |
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118 | output << " {" << endl; |
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119 | |
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120 | cur_indent += CodeGenerator::tabsize; |
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121 | for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) { |
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122 | output << indent; |
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123 | (*i)->accept( *this ); |
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124 | output << ";" << endl; |
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125 | } |
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126 | |
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127 | cur_indent -= CodeGenerator::tabsize; |
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128 | |
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129 | output << indent << "}"; |
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130 | } // if |
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131 | } |
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132 | |
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133 | void CodeGenerator::visit( StructDecl *structDecl ) { |
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134 | output << "struct "; |
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135 | handleAggregate( structDecl ); |
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136 | } |
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137 | |
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138 | void CodeGenerator::visit( UnionDecl *aggregateDecl ) { |
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139 | output << "union "; |
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140 | handleAggregate( aggregateDecl ); |
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141 | } |
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142 | |
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143 | void CodeGenerator::visit( EnumDecl *aggDecl ) { |
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144 | output << "enum "; |
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145 | |
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146 | if ( aggDecl->get_name() != "" ) |
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147 | output << aggDecl->get_name(); |
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148 | |
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149 | std::list< Declaration* > &memb = aggDecl->get_members(); |
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150 | |
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151 | if ( ! memb.empty() ) { |
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152 | output << " {" << endl; |
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153 | |
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154 | cur_indent += CodeGenerator::tabsize; |
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155 | for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) { |
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156 | ObjectDecl *obj = dynamic_cast< ObjectDecl* >( *i ); |
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157 | assert( obj ); |
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158 | output << indent << mangleName( obj ); |
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159 | if ( obj->get_init() ) { |
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160 | output << " = "; |
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161 | obj->get_init()->accept( *this ); |
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162 | } // if |
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163 | output << "," << endl; |
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164 | } // for |
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165 | |
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166 | cur_indent -= CodeGenerator::tabsize; |
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167 | |
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168 | output << indent << "}"; |
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169 | } // if |
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170 | } |
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171 | |
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172 | void CodeGenerator::visit( ContextDecl *aggregateDecl ) {} |
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173 | |
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174 | void CodeGenerator::visit( TypedefDecl *typeDecl ) { |
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175 | output << "typedef "; |
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176 | output << genType( typeDecl->get_base(), typeDecl->get_name() ); |
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177 | } |
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178 | |
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179 | void CodeGenerator::visit( TypeDecl *typeDecl ) { |
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180 | // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes, |
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181 | // still to be done |
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182 | output << "extern unsigned long " << typeDecl->get_name(); |
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183 | if ( typeDecl->get_base() ) { |
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184 | output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )"; |
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185 | } // if |
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186 | } |
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187 | |
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188 | void CodeGenerator::printDesignators( std::list< Expression * > & designators ) { |
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189 | typedef std::list< Expression * > DesignatorList; |
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190 | if ( designators.size() == 0 ) return; |
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191 | for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) { |
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192 | if ( dynamic_cast< NameExpr * >( *iter ) ) { |
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193 | // if expression is a name, then initializing aggregate member |
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194 | output << "."; |
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195 | (*iter)->accept( *this ); |
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196 | } else { |
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197 | // if not a simple name, it has to be a constant expression, i.e. an array designator |
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198 | output << "["; |
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199 | (*iter)->accept( *this ); |
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200 | output << "]"; |
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201 | } |
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202 | } |
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203 | output << " = "; |
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204 | } |
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205 | |
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206 | void CodeGenerator::visit( SingleInit *init ) { |
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207 | printDesignators( init->get_designators() ); |
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208 | init->get_value()->accept( *this ); |
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209 | } |
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210 | |
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211 | void CodeGenerator::visit( ListInit *init ) { |
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212 | printDesignators( init->get_designators() ); |
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213 | output << "{ "; |
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214 | genCommaList( init->begin_initializers(), init->end_initializers() ); |
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215 | output << " }"; |
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216 | } |
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217 | |
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218 | void CodeGenerator::visit( Constant *constant ) { |
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219 | output << constant->get_value() ; |
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220 | } |
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221 | |
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222 | //*** Expressions |
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223 | void CodeGenerator::visit( ApplicationExpr *applicationExpr ) { |
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224 | if ( VariableExpr *varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) { |
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225 | OperatorInfo opInfo; |
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226 | if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) { |
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227 | std::list< Expression* >::iterator arg = applicationExpr->get_args().begin(); |
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228 | switch ( opInfo.type ) { |
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229 | case OT_PREFIXASSIGN: |
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230 | case OT_POSTFIXASSIGN: |
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231 | case OT_INFIXASSIGN: |
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232 | { |
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233 | assert( arg != applicationExpr->get_args().end() ); |
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234 | if ( AddressExpr *addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) { |
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235 | |
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236 | *arg = addrExpr->get_arg(); |
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237 | } else { |
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238 | UntypedExpr *newExpr = new UntypedExpr( new NameExpr( "*?" ) ); |
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239 | newExpr->get_args().push_back( *arg ); |
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240 | *arg = newExpr; |
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241 | } // if |
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242 | break; |
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243 | } |
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244 | |
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245 | default: |
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246 | // do nothing |
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247 | ; |
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248 | } |
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249 | |
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250 | switch ( opInfo.type ) { |
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251 | case OT_INDEX: |
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252 | assert( applicationExpr->get_args().size() == 2 ); |
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253 | (*arg++)->accept( *this ); |
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254 | output << "["; |
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255 | (*arg)->accept( *this ); |
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256 | output << "]"; |
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257 | break; |
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258 | |
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259 | case OT_CALL: |
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260 | case OT_CTOR: |
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261 | case OT_DTOR: |
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262 | // there are no intrinsic definitions of the function call operator or constructors or destructors |
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263 | assert( false ); |
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264 | break; |
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265 | |
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266 | case OT_PREFIX: |
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267 | case OT_PREFIXASSIGN: |
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268 | assert( applicationExpr->get_args().size() == 1 ); |
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269 | output << "("; |
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270 | output << opInfo.symbol; |
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271 | (*arg)->accept( *this ); |
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272 | output << ")"; |
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273 | break; |
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274 | |
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275 | case OT_POSTFIX: |
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276 | case OT_POSTFIXASSIGN: |
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277 | assert( applicationExpr->get_args().size() == 1 ); |
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278 | (*arg)->accept( *this ); |
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279 | output << opInfo.symbol; |
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280 | break; |
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281 | |
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282 | case OT_INFIX: |
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283 | case OT_INFIXASSIGN: |
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284 | assert( applicationExpr->get_args().size() == 2 ); |
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285 | output << "("; |
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286 | (*arg++)->accept( *this ); |
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287 | output << opInfo.symbol; |
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288 | (*arg)->accept( *this ); |
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289 | output << ")"; |
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290 | break; |
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291 | |
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292 | case OT_CONSTANT: |
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293 | case OT_LABELADDRESS: |
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294 | // there are no intrinsic definitions of 0/1 or label addresses as functions |
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295 | assert( false ); |
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296 | } |
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297 | } else { |
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298 | varExpr->accept( *this ); |
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299 | output << "("; |
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300 | genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() ); |
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301 | output << ")"; |
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302 | } // if |
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303 | } else { |
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304 | applicationExpr->get_function()->accept( *this ); |
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305 | output << "("; |
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306 | genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() ); |
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307 | output << ")"; |
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308 | } // if |
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309 | } |
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310 | |
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311 | void CodeGenerator::visit( UntypedExpr *untypedExpr ) { |
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312 | if ( NameExpr *nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) { |
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313 | OperatorInfo opInfo; |
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314 | if ( operatorLookup( nameExpr->get_name(), opInfo ) ) { |
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315 | std::list< Expression* >::iterator arg = untypedExpr->get_args().begin(); |
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316 | switch ( opInfo.type ) { |
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317 | case OT_INDEX: |
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318 | assert( untypedExpr->get_args().size() == 2 ); |
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319 | (*arg++)->accept( *this ); |
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320 | output << "["; |
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321 | (*arg)->accept( *this ); |
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322 | output << "]"; |
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323 | break; |
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324 | |
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325 | case OT_CALL: |
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326 | case OT_CTOR: |
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327 | case OT_DTOR: |
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328 | assert( false ); |
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329 | break; |
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330 | |
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331 | case OT_PREFIX: |
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332 | case OT_PREFIXASSIGN: |
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333 | case OT_LABELADDRESS: |
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334 | assert( untypedExpr->get_args().size() == 1 ); |
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335 | output << "("; |
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336 | output << opInfo.symbol; |
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337 | (*arg)->accept( *this ); |
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338 | output << ")"; |
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339 | break; |
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340 | |
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341 | case OT_POSTFIX: |
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342 | case OT_POSTFIXASSIGN: |
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343 | assert( untypedExpr->get_args().size() == 1 ); |
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344 | (*arg)->accept( *this ); |
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345 | output << opInfo.symbol; |
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346 | break; |
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347 | |
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348 | case OT_INFIX: |
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349 | case OT_INFIXASSIGN: |
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350 | assert( untypedExpr->get_args().size() == 2 ); |
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351 | output << "("; |
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352 | (*arg++)->accept( *this ); |
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353 | output << opInfo.symbol; |
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354 | (*arg)->accept( *this ); |
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355 | output << ")"; |
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356 | break; |
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357 | |
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358 | case OT_CONSTANT: |
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359 | // there are no intrinsic definitions of 0 or 1 as functions |
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360 | assert( false ); |
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361 | } |
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362 | } else { |
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363 | nameExpr->accept( *this ); |
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364 | output << "("; |
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365 | genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() ); |
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366 | output << ")"; |
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367 | } // if |
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368 | } else { |
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369 | untypedExpr->get_function()->accept( *this ); |
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370 | output << "("; |
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371 | genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() ); |
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372 | output << ")"; |
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373 | } // if |
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374 | } |
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375 | |
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376 | void CodeGenerator::visit( NameExpr *nameExpr ) { |
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377 | OperatorInfo opInfo; |
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378 | if ( operatorLookup( nameExpr->get_name(), opInfo ) ) { |
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379 | assert( opInfo.type == OT_CONSTANT ); |
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380 | output << opInfo.symbol; |
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381 | } else { |
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382 | output << nameExpr->get_name(); |
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383 | } // if |
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384 | } |
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385 | |
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386 | void CodeGenerator::visit( AddressExpr *addressExpr ) { |
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387 | output << "(&"; |
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388 | // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address |
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389 | if ( VariableExpr *variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) { |
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390 | output << mangleName( variableExpr->get_var() ); |
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391 | } else { |
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392 | addressExpr->get_arg()->accept( *this ); |
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393 | } // if |
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394 | output << ")"; |
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395 | } |
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396 | |
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397 | void CodeGenerator::visit( CastExpr *castExpr ) { |
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398 | // if the cast is to an lvalue type, then the cast |
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399 | // should be dropped, since the result of a cast is |
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400 | // never an lvalue in C |
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401 | if ( castExpr->get_results().front()->get_isLvalue() ) { |
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402 | castExpr->get_arg()->accept( *this ); |
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403 | } else { |
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404 | output << "(("; |
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405 | if ( castExpr->get_results().empty() ) { |
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406 | output << "void" ; |
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407 | } else { |
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408 | output << genType( castExpr->get_results().front(), "" ); |
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409 | } // if |
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410 | output << ")"; |
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411 | castExpr->get_arg()->accept( *this ); |
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412 | output << ")"; |
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413 | } |
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414 | } |
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415 | |
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416 | void CodeGenerator::visit( UntypedMemberExpr *memberExpr ) { |
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417 | assert( false ); |
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418 | } |
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419 | |
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420 | void CodeGenerator::visit( MemberExpr *memberExpr ) { |
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421 | memberExpr->get_aggregate()->accept( *this ); |
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422 | output << "." << mangleName( memberExpr->get_member() ); |
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423 | } |
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424 | |
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425 | void CodeGenerator::visit( VariableExpr *variableExpr ) { |
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426 | OperatorInfo opInfo; |
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427 | if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) { |
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428 | output << opInfo.symbol; |
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429 | } else { |
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430 | output << mangleName( variableExpr->get_var() ); |
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431 | } // if |
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432 | } |
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433 | |
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434 | void CodeGenerator::visit( ConstantExpr *constantExpr ) { |
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435 | assert( constantExpr->get_constant() ); |
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436 | constantExpr->get_constant()->accept( *this ); |
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437 | } |
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438 | |
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439 | void CodeGenerator::visit( SizeofExpr *sizeofExpr ) { |
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440 | output << "sizeof("; |
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441 | if ( sizeofExpr->get_isType() ) { |
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442 | output << genType( sizeofExpr->get_type(), "" ); |
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443 | } else { |
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444 | sizeofExpr->get_expr()->accept( *this ); |
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445 | } // if |
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446 | output << ")"; |
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447 | } |
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448 | |
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449 | void CodeGenerator::visit( AlignofExpr *sizeofExpr ) { |
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450 | // use GCC extension to avoid bumping std to C11 |
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451 | output << "__alignof__("; |
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452 | if ( sizeofExpr->get_isType() ) { |
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453 | output << genType( sizeofExpr->get_type(), "" ); |
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454 | } else { |
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455 | sizeofExpr->get_expr()->accept( *this ); |
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456 | } // if |
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457 | output << ")"; |
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458 | } |
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459 | |
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460 | void CodeGenerator::visit( LogicalExpr *logicalExpr ) { |
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461 | output << "("; |
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462 | logicalExpr->get_arg1()->accept( *this ); |
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463 | if ( logicalExpr->get_isAnd() ) { |
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464 | output << " && "; |
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465 | } else { |
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466 | output << " || "; |
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467 | } // if |
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468 | logicalExpr->get_arg2()->accept( *this ); |
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469 | output << ")"; |
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470 | } |
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471 | |
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472 | void CodeGenerator::visit( ConditionalExpr *conditionalExpr ) { |
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473 | output << "("; |
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474 | conditionalExpr->get_arg1()->accept( *this ); |
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475 | output << " ? "; |
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476 | conditionalExpr->get_arg2()->accept( *this ); |
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477 | output << " : "; |
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478 | conditionalExpr->get_arg3()->accept( *this ); |
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479 | output << ")"; |
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480 | } |
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481 | |
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482 | void CodeGenerator::visit( CommaExpr *commaExpr ) { |
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483 | output << "("; |
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484 | commaExpr->get_arg1()->accept( *this ); |
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485 | output << " , "; |
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486 | commaExpr->get_arg2()->accept( *this ); |
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487 | output << ")"; |
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488 | } |
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489 | |
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490 | void CodeGenerator::visit( TupleExpr *tupleExpr ) {} |
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491 | |
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492 | void CodeGenerator::visit( TypeExpr *typeExpr ) {} |
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493 | |
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494 | void CodeGenerator::visit( AsmExpr *asmExpr ) { |
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495 | if ( asmExpr->get_inout() ) { |
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496 | output << "[ "; |
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497 | asmExpr->get_inout()->accept( *this ); |
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498 | output << " ] "; |
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499 | } // if |
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500 | asmExpr->get_constraint()->accept( *this ); |
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501 | output << " ( "; |
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502 | asmExpr->get_operand()->accept( *this ); |
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503 | output << " )"; |
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504 | } |
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505 | |
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506 | //*** Statements |
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507 | void CodeGenerator::visit( CompoundStmt *compoundStmt ) { |
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508 | std::list<Statement*> ks = compoundStmt->get_kids(); |
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509 | output << "{" << endl; |
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510 | |
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511 | cur_indent += CodeGenerator::tabsize; |
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512 | |
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513 | for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) { |
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514 | output << indent << printLabels( (*i)->get_labels() ); |
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515 | (*i)->accept( *this ); |
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516 | |
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517 | output << endl; |
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518 | if ( wantSpacing( *i ) ) { |
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519 | output << endl; |
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520 | } |
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521 | } |
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522 | cur_indent -= CodeGenerator::tabsize; |
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523 | |
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524 | output << indent << "}"; |
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525 | } |
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526 | |
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527 | void CodeGenerator::visit( ExprStmt *exprStmt ) { |
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528 | // I don't see why this check is necessary. |
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529 | // If this starts to cause problems then put it back in, |
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530 | // with an explanation |
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531 | assert( exprStmt ); |
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532 | |
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533 | // if ( exprStmt != 0 ) { |
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534 | exprStmt->get_expr()->accept( *this ); |
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535 | output << ";" ; |
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536 | // } // if |
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537 | } |
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538 | |
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539 | void CodeGenerator::visit( AsmStmt *asmStmt ) { |
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540 | output << "asm "; |
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541 | if ( asmStmt->get_voltile() ) output << "volatile "; |
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542 | if ( ! asmStmt->get_gotolabels().empty() ) output << "goto "; |
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543 | output << "( "; |
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544 | if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this ); |
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545 | output << " : "; |
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546 | genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() ); |
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547 | output << " : "; |
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548 | genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() ); |
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549 | output << " : "; |
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550 | genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() ); |
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551 | if ( ! asmStmt->get_gotolabels().empty() ) { |
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552 | output << " : "; |
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553 | for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) { |
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554 | output << *begin++; |
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555 | if ( begin == asmStmt->get_gotolabels().end() ) break; |
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556 | output << ", "; |
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557 | } // for |
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558 | } // if |
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559 | output << " );" ; |
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560 | } |
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561 | |
---|
562 | void CodeGenerator::visit( IfStmt *ifStmt ) { |
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563 | output << "if ( "; |
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564 | ifStmt->get_condition()->accept( *this ); |
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565 | output << " ) "; |
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566 | |
---|
567 | ifStmt->get_thenPart()->accept( *this ); |
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568 | |
---|
569 | if ( ifStmt->get_elsePart() != 0) { |
---|
570 | output << " else "; |
---|
571 | ifStmt->get_elsePart()->accept( *this ); |
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572 | } // if |
---|
573 | } |
---|
574 | |
---|
575 | void CodeGenerator::visit( SwitchStmt *switchStmt ) { |
---|
576 | output << "switch ( " ; |
---|
577 | switchStmt->get_condition()->accept( *this ); |
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578 | output << " ) "; |
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579 | |
---|
580 | output << "{" << std::endl; |
---|
581 | cur_indent += CodeGenerator::tabsize; |
---|
582 | |
---|
583 | acceptAll( switchStmt->get_branches(), *this ); |
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584 | |
---|
585 | cur_indent -= CodeGenerator::tabsize; |
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586 | |
---|
587 | output << indent << "}"; |
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588 | } |
---|
589 | |
---|
590 | void CodeGenerator::visit( CaseStmt *caseStmt ) { |
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591 | output << indent; |
---|
592 | if ( caseStmt->isDefault()) { |
---|
593 | output << "default"; |
---|
594 | } else { |
---|
595 | output << "case "; |
---|
596 | caseStmt->get_condition()->accept( *this ); |
---|
597 | } // if |
---|
598 | output << ":\n"; |
---|
599 | |
---|
600 | std::list<Statement *> sts = caseStmt->get_statements(); |
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601 | |
---|
602 | cur_indent += CodeGenerator::tabsize; |
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603 | for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) { |
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604 | output << indent << printLabels( (*i)->get_labels() ) ; |
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605 | (*i)->accept( *this ); |
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606 | output << endl; |
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607 | } |
---|
608 | cur_indent -= CodeGenerator::tabsize; |
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609 | } |
---|
610 | |
---|
611 | void CodeGenerator::visit( BranchStmt *branchStmt ) { |
---|
612 | switch ( branchStmt->get_type()) { |
---|
613 | case BranchStmt::Goto: |
---|
614 | if ( ! branchStmt->get_target().empty() ) |
---|
615 | output << "goto " << branchStmt->get_target(); |
---|
616 | else { |
---|
617 | if ( branchStmt->get_computedTarget() != 0 ) { |
---|
618 | output << "goto *"; |
---|
619 | branchStmt->get_computedTarget()->accept( *this ); |
---|
620 | } // if |
---|
621 | } // if |
---|
622 | break; |
---|
623 | case BranchStmt::Break: |
---|
624 | output << "break"; |
---|
625 | break; |
---|
626 | case BranchStmt::Continue: |
---|
627 | output << "continue"; |
---|
628 | break; |
---|
629 | } |
---|
630 | output << ";"; |
---|
631 | } |
---|
632 | |
---|
633 | |
---|
634 | void CodeGenerator::visit( ReturnStmt *returnStmt ) { |
---|
635 | output << "return "; |
---|
636 | |
---|
637 | // xxx -- check for null expression; |
---|
638 | if ( returnStmt->get_expr() ) { |
---|
639 | returnStmt->get_expr()->accept( *this ); |
---|
640 | } // if |
---|
641 | output << ";"; |
---|
642 | } |
---|
643 | |
---|
644 | void CodeGenerator::visit( WhileStmt *whileStmt ) { |
---|
645 | if ( whileStmt->get_isDoWhile() ) |
---|
646 | output << "do" ; |
---|
647 | else { |
---|
648 | output << "while (" ; |
---|
649 | whileStmt->get_condition()->accept( *this ); |
---|
650 | output << ")"; |
---|
651 | } // if |
---|
652 | output << " "; |
---|
653 | |
---|
654 | output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() ); |
---|
655 | whileStmt->get_body()->accept( *this ); |
---|
656 | |
---|
657 | output << indent; |
---|
658 | |
---|
659 | if ( whileStmt->get_isDoWhile() ) { |
---|
660 | output << " while (" ; |
---|
661 | whileStmt->get_condition()->accept( *this ); |
---|
662 | output << ");"; |
---|
663 | } // if |
---|
664 | } |
---|
665 | |
---|
666 | void CodeGenerator::visit( ForStmt *forStmt ) { |
---|
667 | // initialization is always hoisted, so don't |
---|
668 | // bother doing anything with that |
---|
669 | output << "for (;"; |
---|
670 | |
---|
671 | if ( forStmt->get_condition() != 0 ) |
---|
672 | forStmt->get_condition()->accept( *this ); |
---|
673 | output << ";"; |
---|
674 | |
---|
675 | if ( forStmt->get_increment() != 0 ) |
---|
676 | forStmt->get_increment()->accept( *this ); |
---|
677 | output << ") "; |
---|
678 | |
---|
679 | if ( forStmt->get_body() != 0 ) { |
---|
680 | output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() ); |
---|
681 | forStmt->get_body()->accept( *this ); |
---|
682 | } // if |
---|
683 | } |
---|
684 | |
---|
685 | void CodeGenerator::visit( NullStmt *nullStmt ) { |
---|
686 | //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() ); |
---|
687 | output << "/* null statement */ ;"; |
---|
688 | } |
---|
689 | |
---|
690 | void CodeGenerator::visit( DeclStmt *declStmt ) { |
---|
691 | declStmt->get_decl()->accept( *this ); |
---|
692 | |
---|
693 | if ( doSemicolon( declStmt->get_decl() ) ) { |
---|
694 | output << ";"; |
---|
695 | } // if |
---|
696 | } |
---|
697 | |
---|
698 | std::string CodeGenerator::printLabels( std::list< Label > &l ) { |
---|
699 | std::string str( "" ); |
---|
700 | l.unique(); // assumes a sorted list. Why not use set? |
---|
701 | |
---|
702 | for ( std::list< Label >::iterator i = l.begin(); i != l.end(); i++ ) |
---|
703 | str += *i + ": "; |
---|
704 | |
---|
705 | return str; |
---|
706 | } |
---|
707 | |
---|
708 | void CodeGenerator::handleStorageClass( Declaration *decl ) { |
---|
709 | switch ( decl->get_storageClass() ) { |
---|
710 | case DeclarationNode::Extern: |
---|
711 | output << "extern "; |
---|
712 | break; |
---|
713 | case DeclarationNode::Static: |
---|
714 | output << "static "; |
---|
715 | break; |
---|
716 | case DeclarationNode::Auto: |
---|
717 | // silently drop storage class |
---|
718 | break; |
---|
719 | case DeclarationNode::Register: |
---|
720 | output << "register "; |
---|
721 | break; |
---|
722 | case DeclarationNode::Inline: |
---|
723 | output << "inline "; |
---|
724 | break; |
---|
725 | case DeclarationNode::Fortran: |
---|
726 | output << "fortran "; |
---|
727 | break; |
---|
728 | case DeclarationNode::Noreturn: |
---|
729 | output << "_Noreturn "; |
---|
730 | break; |
---|
731 | case DeclarationNode::Threadlocal: |
---|
732 | output << "_Thread_local "; |
---|
733 | break; |
---|
734 | case DeclarationNode::NoStorageClass: |
---|
735 | break; |
---|
736 | } // switch |
---|
737 | } |
---|
738 | } // namespace CodeGen |
---|
739 | |
---|
740 | // Local Variables: // |
---|
741 | // tab-width: 4 // |
---|
742 | // mode: c++ // |
---|
743 | // compile-command: "make install" // |
---|
744 | // End: // |
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