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 : Mon Apr 04 17:08:06 2016 |
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13 | // Update Count : 255 |
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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 | |
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29 | #include "Common/utility.h" |
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30 | #include "Common/UnimplementedError.h" |
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31 | |
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32 | #include "CodeGenerator.h" |
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33 | #include "OperatorTable.h" |
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34 | #include "GenType.h" |
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35 | |
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36 | using namespace std; |
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37 | |
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38 | namespace CodeGen { |
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39 | int CodeGenerator::tabsize = 4; |
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40 | |
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41 | // the kinds of statements that would ideally be followed by whitespace |
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42 | bool wantSpacing( Statement * stmt) { |
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43 | return dynamic_cast< IfStmt * >( stmt ) || dynamic_cast< CompoundStmt * >( stmt ) || |
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44 | dynamic_cast< WhileStmt * >( stmt ) || dynamic_cast< ForStmt * > ( stmt ) || dynamic_cast< SwitchStmt *>( stmt ); |
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45 | } |
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46 | |
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47 | ostream & CodeGenerator::Indenter::operator()( ostream & output ) { |
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48 | return output << string( cg.cur_indent, ' ' ); |
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49 | } |
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50 | |
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51 | ostream & operator<<( ostream & output, CodeGenerator::Indenter &indent ) { |
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52 | return indent( output ); |
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53 | } |
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54 | |
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55 | CodeGenerator::CodeGenerator( std::ostream &os ) : indent( *this), cur_indent( 0 ), insideFunction( false ), output( os ) { } |
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56 | |
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57 | CodeGenerator::CodeGenerator( std::ostream &os, std::string init, int indentation, bool infunp ) |
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58 | : indent( *this), cur_indent( indentation ), insideFunction( infunp ), output( os ) { |
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59 | //output << std::string( init ); |
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60 | } |
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61 | |
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62 | CodeGenerator::CodeGenerator( std::ostream &os, char *init, int indentation, bool infunp ) |
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63 | : indent( *this ), cur_indent( indentation ), insideFunction( infunp ), output( os ) { |
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64 | //output << std::string( init ); |
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65 | } |
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66 | |
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67 | string mangleName( DeclarationWithType *decl ) { |
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68 | if ( decl->get_mangleName() != "" ) { |
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69 | return decl->get_mangleName(); |
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70 | } else { |
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71 | return decl->get_name(); |
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72 | } // if |
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73 | } |
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74 | |
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75 | //*** Declarations |
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76 | void CodeGenerator::visit( FunctionDecl *functionDecl ) { |
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77 | handleStorageClass( functionDecl ); |
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78 | if ( functionDecl->get_isInline() ) { |
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79 | output << "inline "; |
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80 | } // if |
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81 | if ( functionDecl->get_isNoreturn() ) { |
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82 | output << "_Noreturn "; |
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83 | } // if |
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84 | output << genType( functionDecl->get_functionType(), mangleName( functionDecl ) ); |
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85 | |
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86 | // how to get this to the Functype? |
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87 | std::list< Declaration * > olds = functionDecl->get_oldDecls(); |
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88 | if ( ! olds.empty() ) { |
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89 | output << " /* function has old declaration */"; |
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90 | } // if |
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91 | |
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92 | // acceptAll( functionDecl->get_oldDecls(), *this ); |
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93 | if ( functionDecl->get_statements() ) { |
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94 | functionDecl->get_statements()->accept( *this ); |
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95 | } // if |
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96 | } |
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97 | |
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98 | void CodeGenerator::visit( ObjectDecl *objectDecl ) { |
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99 | handleStorageClass( objectDecl ); |
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100 | output << genType( objectDecl->get_type(), mangleName( objectDecl ) ); |
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101 | |
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102 | if ( objectDecl->get_init() ) { |
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103 | output << " = "; |
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104 | objectDecl->get_init()->accept( *this ); |
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105 | } // if |
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106 | if ( objectDecl->get_bitfieldWidth() ) { |
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107 | output << ":"; |
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108 | objectDecl->get_bitfieldWidth()->accept( *this ); |
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109 | } // if |
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110 | } |
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111 | |
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112 | void CodeGenerator::handleAggregate( AggregateDecl *aggDecl ) { |
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113 | if ( aggDecl->get_name() != "" ) |
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114 | output << aggDecl->get_name(); |
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115 | |
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116 | std::list< Declaration * > &memb = aggDecl->get_members(); |
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117 | |
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118 | if ( ! memb.empty() ) { |
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119 | output << " {" << endl; |
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120 | |
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121 | cur_indent += CodeGenerator::tabsize; |
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122 | for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) { |
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123 | output << indent; |
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124 | (*i)->accept( *this ); |
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125 | output << ";" << endl; |
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126 | } |
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127 | |
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128 | cur_indent -= CodeGenerator::tabsize; |
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129 | |
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130 | output << indent << "}"; |
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131 | } // if |
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132 | } |
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133 | |
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134 | void CodeGenerator::visit( StructDecl *structDecl ) { |
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135 | output << "struct "; |
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136 | handleAggregate( structDecl ); |
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137 | } |
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138 | |
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139 | void CodeGenerator::visit( UnionDecl *aggregateDecl ) { |
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140 | output << "union "; |
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141 | handleAggregate( aggregateDecl ); |
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142 | } |
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143 | |
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144 | void CodeGenerator::visit( EnumDecl *aggDecl ) { |
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145 | output << "enum "; |
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146 | |
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147 | if ( aggDecl->get_name() != "" ) |
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148 | output << aggDecl->get_name(); |
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149 | |
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150 | std::list< Declaration* > &memb = aggDecl->get_members(); |
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151 | |
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152 | if ( ! memb.empty() ) { |
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153 | output << " {" << endl; |
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154 | |
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155 | cur_indent += CodeGenerator::tabsize; |
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156 | for ( std::list< Declaration* >::iterator i = memb.begin(); i != memb.end(); i++) { |
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157 | ObjectDecl *obj = dynamic_cast< ObjectDecl* >( *i ); |
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158 | assert( obj ); |
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159 | output << indent << mangleName( obj ); |
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160 | if ( obj->get_init() ) { |
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161 | output << " = "; |
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162 | obj->get_init()->accept( *this ); |
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163 | } // if |
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164 | output << "," << endl; |
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165 | } // for |
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166 | |
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167 | cur_indent -= CodeGenerator::tabsize; |
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168 | |
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169 | output << indent << "}"; |
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170 | } // if |
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171 | } |
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172 | |
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173 | void CodeGenerator::visit( TraitDecl *aggregateDecl ) {} |
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174 | |
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175 | void CodeGenerator::visit( TypedefDecl *typeDecl ) { |
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176 | output << "typedef "; |
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177 | output << genType( typeDecl->get_base(), typeDecl->get_name() ); |
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178 | } |
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179 | |
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180 | void CodeGenerator::visit( TypeDecl *typeDecl ) { |
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181 | // really, we should mutate this into something that isn't a TypeDecl but that requires large-scale changes, |
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182 | // still to be done |
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183 | output << "extern unsigned long " << typeDecl->get_name(); |
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184 | if ( typeDecl->get_base() ) { |
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185 | output << " = sizeof( " << genType( typeDecl->get_base(), "" ) << " )"; |
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186 | } // if |
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187 | } |
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188 | |
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189 | void CodeGenerator::printDesignators( std::list< Expression * > & designators ) { |
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190 | typedef std::list< Expression * > DesignatorList; |
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191 | if ( designators.size() == 0 ) return; |
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192 | for ( DesignatorList::iterator iter = designators.begin(); iter != designators.end(); ++iter ) { |
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193 | if ( dynamic_cast< NameExpr * >( *iter ) ) { |
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194 | // if expression is a name, then initializing aggregate member |
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195 | output << "."; |
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196 | (*iter)->accept( *this ); |
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197 | } else { |
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198 | // if not a simple name, it has to be a constant expression, i.e. an array designator |
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199 | output << "["; |
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200 | (*iter)->accept( *this ); |
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201 | output << "]"; |
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202 | } |
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203 | } |
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204 | output << " = "; |
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205 | } |
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206 | |
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207 | void CodeGenerator::visit( SingleInit *init ) { |
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208 | printDesignators( init->get_designators() ); |
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209 | init->get_value()->accept( *this ); |
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210 | } |
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211 | |
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212 | void CodeGenerator::visit( ListInit *init ) { |
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213 | printDesignators( init->get_designators() ); |
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214 | output << "{ "; |
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215 | if ( init->begin_initializers() == init->end_initializers() ) { |
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216 | // illegal to leave initializer list empty for scalar initializers, |
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217 | // but always legal to have 0 |
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218 | output << "0"; |
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219 | } else { |
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220 | genCommaList( init->begin_initializers(), init->end_initializers() ); |
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221 | } |
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222 | output << " }"; |
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223 | } |
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224 | |
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225 | void CodeGenerator::visit( Constant *constant ) { |
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226 | output << constant->get_value() ; |
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227 | } |
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228 | |
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229 | //*** Expressions |
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230 | void CodeGenerator::visit( ApplicationExpr *applicationExpr ) { |
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231 | if ( VariableExpr *varExpr = dynamic_cast< VariableExpr* >( applicationExpr->get_function() ) ) { |
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232 | OperatorInfo opInfo; |
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233 | if ( varExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( varExpr->get_var()->get_name(), opInfo ) ) { |
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234 | std::list< Expression* >::iterator arg = applicationExpr->get_args().begin(); |
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235 | switch ( opInfo.type ) { |
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236 | case OT_PREFIXASSIGN: |
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237 | case OT_POSTFIXASSIGN: |
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238 | case OT_INFIXASSIGN: |
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239 | { |
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240 | assert( arg != applicationExpr->get_args().end() ); |
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241 | if ( AddressExpr *addrExpr = dynamic_cast< AddressExpr * >( *arg ) ) { |
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242 | |
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243 | *arg = addrExpr->get_arg(); |
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244 | } else { |
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245 | UntypedExpr *newExpr = new UntypedExpr( new NameExpr( "*?" ) ); |
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246 | newExpr->get_args().push_back( *arg ); |
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247 | *arg = newExpr; |
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248 | } // if |
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249 | break; |
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250 | } |
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251 | |
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252 | default: |
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253 | // do nothing |
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254 | ; |
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255 | } |
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256 | |
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257 | switch ( opInfo.type ) { |
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258 | case OT_INDEX: |
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259 | assert( applicationExpr->get_args().size() == 2 ); |
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260 | (*arg++)->accept( *this ); |
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261 | output << "["; |
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262 | (*arg)->accept( *this ); |
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263 | output << "]"; |
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264 | break; |
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265 | |
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266 | case OT_CALL: |
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267 | // there are no intrinsic definitions of the function call operator or constructors or destructors |
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268 | assert( false ); |
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269 | break; |
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270 | |
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271 | case OT_CTOR: |
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272 | // it's just an optimization to disallow this, so for now let it through |
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273 | // since it makes autogenerating constructors a lot easier |
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274 | varExpr->accept( *this ); |
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275 | output << "("; |
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276 | genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() ); |
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277 | output << ")"; |
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278 | |
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279 | // intrinsic constructors should never be called directly - they should be transformed back into Initializer nodes |
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280 | // assert(false); |
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281 | break; |
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282 | |
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283 | case OT_DTOR: |
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284 | // intrinsic destructors do nothing - don't generate any code |
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285 | output << " /* " << dynamic_cast<VariableExpr*>(applicationExpr->get_function())->get_var()->get_name() << " */"; |
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286 | break; |
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287 | |
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288 | case OT_PREFIX: |
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289 | case OT_PREFIXASSIGN: |
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290 | assert( applicationExpr->get_args().size() == 1 ); |
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291 | output << "("; |
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292 | output << opInfo.symbol; |
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293 | (*arg)->accept( *this ); |
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294 | output << ")"; |
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295 | break; |
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296 | |
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297 | case OT_POSTFIX: |
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298 | case OT_POSTFIXASSIGN: |
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299 | assert( applicationExpr->get_args().size() == 1 ); |
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300 | (*arg)->accept( *this ); |
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301 | output << opInfo.symbol; |
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302 | break; |
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303 | |
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304 | |
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305 | case OT_INFIX: |
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306 | case OT_INFIXASSIGN: |
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307 | assert( applicationExpr->get_args().size() == 2 ); |
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308 | output << "("; |
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309 | (*arg++)->accept( *this ); |
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310 | output << opInfo.symbol; |
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311 | (*arg)->accept( *this ); |
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312 | output << ")"; |
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313 | break; |
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314 | |
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315 | case OT_CONSTANT: |
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316 | case OT_LABELADDRESS: |
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317 | // there are no intrinsic definitions of 0/1 or label addresses as functions |
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318 | assert( false ); |
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319 | } |
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320 | } else { |
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321 | varExpr->accept( *this ); |
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322 | output << "("; |
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323 | genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() ); |
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324 | output << ")"; |
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325 | } // if |
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326 | } else { |
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327 | applicationExpr->get_function()->accept( *this ); |
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328 | output << "("; |
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329 | genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() ); |
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330 | output << ")"; |
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331 | } // if |
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332 | } |
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333 | |
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334 | void CodeGenerator::visit( UntypedExpr *untypedExpr ) { |
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335 | if ( NameExpr *nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) { |
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336 | OperatorInfo opInfo; |
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337 | if ( operatorLookup( nameExpr->get_name(), opInfo ) ) { |
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338 | std::list< Expression* >::iterator arg = untypedExpr->get_args().begin(); |
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339 | switch ( opInfo.type ) { |
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340 | case OT_INDEX: |
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341 | assert( untypedExpr->get_args().size() == 2 ); |
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342 | (*arg++)->accept( *this ); |
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343 | output << "["; |
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344 | (*arg)->accept( *this ); |
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345 | output << "]"; |
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346 | break; |
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347 | |
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348 | case OT_CALL: |
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349 | assert( false ); |
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350 | |
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351 | case OT_CTOR: |
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352 | case OT_DTOR: |
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353 | // intrinsic constructors should never be called |
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354 | // intrinsic destructors do nothing |
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355 | break; |
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356 | |
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357 | case OT_PREFIX: |
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358 | case OT_PREFIXASSIGN: |
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359 | case OT_LABELADDRESS: |
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360 | assert( untypedExpr->get_args().size() == 1 ); |
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361 | output << "("; |
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362 | output << opInfo.symbol; |
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363 | (*arg)->accept( *this ); |
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364 | output << ")"; |
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365 | break; |
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366 | |
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367 | case OT_POSTFIX: |
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368 | case OT_POSTFIXASSIGN: |
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369 | assert( untypedExpr->get_args().size() == 1 ); |
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370 | (*arg)->accept( *this ); |
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371 | output << opInfo.symbol; |
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372 | break; |
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373 | |
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374 | case OT_INFIX: |
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375 | case OT_INFIXASSIGN: |
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376 | assert( untypedExpr->get_args().size() == 2 ); |
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377 | output << "("; |
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378 | (*arg++)->accept( *this ); |
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379 | output << opInfo.symbol; |
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380 | (*arg)->accept( *this ); |
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381 | output << ")"; |
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382 | break; |
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383 | |
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384 | case OT_CONSTANT: |
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385 | // there are no intrinsic definitions of 0 or 1 as functions |
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386 | assert( false ); |
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387 | } |
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388 | } else { |
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389 | nameExpr->accept( *this ); |
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390 | output << "("; |
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391 | genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() ); |
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392 | output << ")"; |
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393 | } // if |
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394 | } else { |
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395 | untypedExpr->get_function()->accept( *this ); |
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396 | output << "("; |
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397 | genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() ); |
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398 | output << ")"; |
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399 | } // if |
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400 | } |
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401 | |
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402 | void CodeGenerator::visit( NameExpr *nameExpr ) { |
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403 | OperatorInfo opInfo; |
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404 | if ( operatorLookup( nameExpr->get_name(), opInfo ) ) { |
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405 | assert( opInfo.type == OT_CONSTANT ); |
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406 | output << opInfo.symbol; |
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407 | } else { |
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408 | output << nameExpr->get_name(); |
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409 | } // if |
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410 | } |
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411 | |
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412 | void CodeGenerator::visit( AddressExpr *addressExpr ) { |
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413 | output << "(&"; |
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414 | // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address |
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415 | if ( VariableExpr *variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) { |
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416 | output << mangleName( variableExpr->get_var() ); |
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417 | } else { |
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418 | addressExpr->get_arg()->accept( *this ); |
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419 | } // if |
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420 | output << ")"; |
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421 | } |
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422 | |
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423 | void CodeGenerator::visit( CastExpr *castExpr ) { |
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424 | output << "("; |
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425 | if ( castExpr->get_results().empty() ) { |
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426 | output << "(void)" ; |
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427 | } else if ( ! castExpr->get_results().front()->get_isLvalue() ) { |
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428 | // at least one result type of cast, but not an lvalue |
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429 | output << "("; |
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430 | output << genType( castExpr->get_results().front(), "" ); |
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431 | output << ")"; |
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432 | } else { |
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433 | // otherwise, the cast is to an lvalue type, so the cast |
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434 | // should be dropped, since the result of a cast is |
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435 | // never an lvalue in C |
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436 | } |
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437 | castExpr->get_arg()->accept( *this ); |
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438 | output << ")"; |
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439 | } |
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440 | |
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441 | void CodeGenerator::visit( UntypedMemberExpr *memberExpr ) { |
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442 | assert( false ); |
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443 | } |
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444 | |
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445 | void CodeGenerator::visit( MemberExpr *memberExpr ) { |
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446 | memberExpr->get_aggregate()->accept( *this ); |
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447 | output << "." << mangleName( memberExpr->get_member() ); |
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448 | } |
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449 | |
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450 | void CodeGenerator::visit( VariableExpr *variableExpr ) { |
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451 | OperatorInfo opInfo; |
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452 | if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) { |
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453 | output << opInfo.symbol; |
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454 | } else { |
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455 | output << mangleName( variableExpr->get_var() ); |
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456 | } // if |
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457 | } |
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458 | |
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459 | void CodeGenerator::visit( ConstantExpr *constantExpr ) { |
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460 | assert( constantExpr->get_constant() ); |
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461 | constantExpr->get_constant()->accept( *this ); |
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462 | } |
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463 | |
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464 | void CodeGenerator::visit( SizeofExpr *sizeofExpr ) { |
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465 | output << "sizeof("; |
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466 | if ( sizeofExpr->get_isType() ) { |
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467 | output << genType( sizeofExpr->get_type(), "" ); |
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468 | } else { |
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469 | sizeofExpr->get_expr()->accept( *this ); |
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470 | } // if |
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471 | output << ")"; |
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472 | } |
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473 | |
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474 | void CodeGenerator::visit( AlignofExpr *alignofExpr ) { |
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475 | // use GCC extension to avoid bumping std to C11 |
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476 | output << "__alignof__("; |
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477 | if ( alignofExpr->get_isType() ) { |
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478 | output << genType( alignofExpr->get_type(), "" ); |
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479 | } else { |
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480 | alignofExpr->get_expr()->accept( *this ); |
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481 | } // if |
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482 | output << ")"; |
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483 | } |
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484 | |
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485 | void CodeGenerator::visit( UntypedOffsetofExpr *offsetofExpr ) { |
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486 | assert( false ); |
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487 | } |
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488 | |
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489 | void CodeGenerator::visit( OffsetofExpr *offsetofExpr ) { |
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490 | // use GCC builtin |
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491 | output << "__builtin_offsetof("; |
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492 | output << genType( offsetofExpr->get_type(), "" ); |
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493 | output << ", " << mangleName( offsetofExpr->get_member() ); |
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494 | output << ")"; |
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495 | } |
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496 | |
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497 | void CodeGenerator::visit( LogicalExpr *logicalExpr ) { |
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498 | output << "("; |
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499 | logicalExpr->get_arg1()->accept( *this ); |
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500 | if ( logicalExpr->get_isAnd() ) { |
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501 | output << " && "; |
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502 | } else { |
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503 | output << " || "; |
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504 | } // if |
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505 | logicalExpr->get_arg2()->accept( *this ); |
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506 | output << ")"; |
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507 | } |
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508 | |
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509 | void CodeGenerator::visit( ConditionalExpr *conditionalExpr ) { |
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510 | output << "("; |
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511 | conditionalExpr->get_arg1()->accept( *this ); |
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512 | output << " ? "; |
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513 | conditionalExpr->get_arg2()->accept( *this ); |
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514 | output << " : "; |
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515 | conditionalExpr->get_arg3()->accept( *this ); |
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516 | output << ")"; |
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517 | } |
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518 | |
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519 | void CodeGenerator::visit( CommaExpr *commaExpr ) { |
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520 | output << "("; |
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521 | commaExpr->get_arg1()->accept( *this ); |
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522 | output << " , "; |
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523 | commaExpr->get_arg2()->accept( *this ); |
---|
524 | output << ")"; |
---|
525 | } |
---|
526 | |
---|
527 | void CodeGenerator::visit( TupleExpr *tupleExpr ) {} |
---|
528 | |
---|
529 | void CodeGenerator::visit( TypeExpr *typeExpr ) {} |
---|
530 | |
---|
531 | void CodeGenerator::visit( AsmExpr *asmExpr ) { |
---|
532 | if ( asmExpr->get_inout() ) { |
---|
533 | output << "[ "; |
---|
534 | asmExpr->get_inout()->accept( *this ); |
---|
535 | output << " ] "; |
---|
536 | } // if |
---|
537 | asmExpr->get_constraint()->accept( *this ); |
---|
538 | output << " ( "; |
---|
539 | asmExpr->get_operand()->accept( *this ); |
---|
540 | output << " )"; |
---|
541 | } |
---|
542 | |
---|
543 | //*** Statements |
---|
544 | void CodeGenerator::visit( CompoundStmt *compoundStmt ) { |
---|
545 | std::list<Statement*> ks = compoundStmt->get_kids(); |
---|
546 | output << "{" << endl; |
---|
547 | |
---|
548 | cur_indent += CodeGenerator::tabsize; |
---|
549 | |
---|
550 | for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) { |
---|
551 | output << indent << printLabels( (*i)->get_labels() ); |
---|
552 | (*i)->accept( *this ); |
---|
553 | |
---|
554 | output << endl; |
---|
555 | if ( wantSpacing( *i ) ) { |
---|
556 | output << endl; |
---|
557 | } |
---|
558 | } |
---|
559 | cur_indent -= CodeGenerator::tabsize; |
---|
560 | |
---|
561 | output << indent << "}"; |
---|
562 | } |
---|
563 | |
---|
564 | void CodeGenerator::visit( ExprStmt *exprStmt ) { |
---|
565 | // I don't see why this check is necessary. |
---|
566 | // If this starts to cause problems then put it back in, |
---|
567 | // with an explanation |
---|
568 | assert( exprStmt ); |
---|
569 | |
---|
570 | // if ( exprStmt != 0 ) { |
---|
571 | exprStmt->get_expr()->accept( *this ); |
---|
572 | output << ";" ; |
---|
573 | // } // if |
---|
574 | } |
---|
575 | |
---|
576 | void CodeGenerator::visit( AsmStmt *asmStmt ) { |
---|
577 | output << "asm "; |
---|
578 | if ( asmStmt->get_voltile() ) output << "volatile "; |
---|
579 | if ( ! asmStmt->get_gotolabels().empty() ) output << "goto "; |
---|
580 | output << "( "; |
---|
581 | if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this ); |
---|
582 | output << " : "; |
---|
583 | genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() ); |
---|
584 | output << " : "; |
---|
585 | genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() ); |
---|
586 | output << " : "; |
---|
587 | genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() ); |
---|
588 | if ( ! asmStmt->get_gotolabels().empty() ) { |
---|
589 | output << " : "; |
---|
590 | for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) { |
---|
591 | output << *begin++; |
---|
592 | if ( begin == asmStmt->get_gotolabels().end() ) break; |
---|
593 | output << ", "; |
---|
594 | } // for |
---|
595 | } // if |
---|
596 | output << " );" ; |
---|
597 | } |
---|
598 | |
---|
599 | void CodeGenerator::visit( IfStmt *ifStmt ) { |
---|
600 | output << "if ( "; |
---|
601 | ifStmt->get_condition()->accept( *this ); |
---|
602 | output << " ) "; |
---|
603 | |
---|
604 | ifStmt->get_thenPart()->accept( *this ); |
---|
605 | |
---|
606 | if ( ifStmt->get_elsePart() != 0) { |
---|
607 | output << " else "; |
---|
608 | ifStmt->get_elsePart()->accept( *this ); |
---|
609 | } // if |
---|
610 | } |
---|
611 | |
---|
612 | void CodeGenerator::visit( SwitchStmt *switchStmt ) { |
---|
613 | output << "switch ( " ; |
---|
614 | switchStmt->get_condition()->accept( *this ); |
---|
615 | output << " ) "; |
---|
616 | |
---|
617 | output << "{" << std::endl; |
---|
618 | cur_indent += CodeGenerator::tabsize; |
---|
619 | |
---|
620 | acceptAll( switchStmt->get_branches(), *this ); |
---|
621 | |
---|
622 | cur_indent -= CodeGenerator::tabsize; |
---|
623 | |
---|
624 | output << indent << "}"; |
---|
625 | } |
---|
626 | |
---|
627 | void CodeGenerator::visit( CaseStmt *caseStmt ) { |
---|
628 | output << indent; |
---|
629 | if ( caseStmt->isDefault()) { |
---|
630 | output << "default"; |
---|
631 | } else { |
---|
632 | output << "case "; |
---|
633 | caseStmt->get_condition()->accept( *this ); |
---|
634 | } // if |
---|
635 | output << ":\n"; |
---|
636 | |
---|
637 | std::list<Statement *> sts = caseStmt->get_statements(); |
---|
638 | |
---|
639 | cur_indent += CodeGenerator::tabsize; |
---|
640 | for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) { |
---|
641 | output << indent << printLabels( (*i)->get_labels() ) ; |
---|
642 | (*i)->accept( *this ); |
---|
643 | output << endl; |
---|
644 | } |
---|
645 | cur_indent -= CodeGenerator::tabsize; |
---|
646 | } |
---|
647 | |
---|
648 | void CodeGenerator::visit( BranchStmt *branchStmt ) { |
---|
649 | switch ( branchStmt->get_type()) { |
---|
650 | case BranchStmt::Goto: |
---|
651 | if ( ! branchStmt->get_target().empty() ) |
---|
652 | output << "goto " << branchStmt->get_target(); |
---|
653 | else { |
---|
654 | if ( branchStmt->get_computedTarget() != 0 ) { |
---|
655 | output << "goto *"; |
---|
656 | branchStmt->get_computedTarget()->accept( *this ); |
---|
657 | } // if |
---|
658 | } // if |
---|
659 | break; |
---|
660 | case BranchStmt::Break: |
---|
661 | output << "break"; |
---|
662 | break; |
---|
663 | case BranchStmt::Continue: |
---|
664 | output << "continue"; |
---|
665 | break; |
---|
666 | } |
---|
667 | output << ";"; |
---|
668 | } |
---|
669 | |
---|
670 | |
---|
671 | void CodeGenerator::visit( ReturnStmt *returnStmt ) { |
---|
672 | output << "return "; |
---|
673 | |
---|
674 | // xxx -- check for null expression; |
---|
675 | if ( returnStmt->get_expr() ) { |
---|
676 | returnStmt->get_expr()->accept( *this ); |
---|
677 | } // if |
---|
678 | output << ";"; |
---|
679 | } |
---|
680 | |
---|
681 | void CodeGenerator::visit( WhileStmt *whileStmt ) { |
---|
682 | if ( whileStmt->get_isDoWhile() ) |
---|
683 | output << "do" ; |
---|
684 | else { |
---|
685 | output << "while (" ; |
---|
686 | whileStmt->get_condition()->accept( *this ); |
---|
687 | output << ")"; |
---|
688 | } // if |
---|
689 | output << " "; |
---|
690 | |
---|
691 | output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() ); |
---|
692 | whileStmt->get_body()->accept( *this ); |
---|
693 | |
---|
694 | output << indent; |
---|
695 | |
---|
696 | if ( whileStmt->get_isDoWhile() ) { |
---|
697 | output << " while (" ; |
---|
698 | whileStmt->get_condition()->accept( *this ); |
---|
699 | output << ");"; |
---|
700 | } // if |
---|
701 | } |
---|
702 | |
---|
703 | void CodeGenerator::visit( ForStmt *forStmt ) { |
---|
704 | // initialization is always hoisted, so don't |
---|
705 | // bother doing anything with that |
---|
706 | output << "for (;"; |
---|
707 | |
---|
708 | if ( forStmt->get_condition() != 0 ) |
---|
709 | forStmt->get_condition()->accept( *this ); |
---|
710 | output << ";"; |
---|
711 | |
---|
712 | if ( forStmt->get_increment() != 0 ) |
---|
713 | forStmt->get_increment()->accept( *this ); |
---|
714 | output << ") "; |
---|
715 | |
---|
716 | if ( forStmt->get_body() != 0 ) { |
---|
717 | output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() ); |
---|
718 | forStmt->get_body()->accept( *this ); |
---|
719 | } // if |
---|
720 | } |
---|
721 | |
---|
722 | void CodeGenerator::visit( NullStmt *nullStmt ) { |
---|
723 | //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() ); |
---|
724 | output << "/* null statement */ ;"; |
---|
725 | } |
---|
726 | |
---|
727 | void CodeGenerator::visit( DeclStmt *declStmt ) { |
---|
728 | declStmt->get_decl()->accept( *this ); |
---|
729 | |
---|
730 | if ( doSemicolon( declStmt->get_decl() ) ) { |
---|
731 | output << ";"; |
---|
732 | } // if |
---|
733 | } |
---|
734 | |
---|
735 | std::string CodeGenerator::printLabels( std::list< Label > &l ) { |
---|
736 | std::string str( "" ); |
---|
737 | l.unique(); // assumes a sorted list. Why not use set? |
---|
738 | |
---|
739 | for ( std::list< Label >::iterator i = l.begin(); i != l.end(); i++ ) |
---|
740 | str += *i + ": "; |
---|
741 | |
---|
742 | return str; |
---|
743 | } |
---|
744 | |
---|
745 | void CodeGenerator::handleStorageClass( Declaration *decl ) { |
---|
746 | switch ( decl->get_storageClass() ) { |
---|
747 | case DeclarationNode::Extern: |
---|
748 | output << "extern "; |
---|
749 | break; |
---|
750 | case DeclarationNode::Static: |
---|
751 | output << "static "; |
---|
752 | break; |
---|
753 | case DeclarationNode::Auto: |
---|
754 | // silently drop storage class |
---|
755 | break; |
---|
756 | case DeclarationNode::Register: |
---|
757 | output << "register "; |
---|
758 | break; |
---|
759 | case DeclarationNode::Inline: |
---|
760 | output << "inline "; |
---|
761 | break; |
---|
762 | case DeclarationNode::Fortran: |
---|
763 | output << "fortran "; |
---|
764 | break; |
---|
765 | case DeclarationNode::Noreturn: |
---|
766 | output << "_Noreturn "; |
---|
767 | break; |
---|
768 | case DeclarationNode::Threadlocal: |
---|
769 | output << "_Thread_local "; |
---|
770 | break; |
---|
771 | case DeclarationNode::NoStorageClass: |
---|
772 | break; |
---|
773 | } // switch |
---|
774 | } |
---|
775 | } // namespace CodeGen |
---|
776 | |
---|
777 | // Local Variables: // |
---|
778 | // tab-width: 4 // |
---|
779 | // mode: c++ // |
---|
780 | // compile-command: "make install" // |
---|
781 | // End: // |
---|