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 15:24:08 2015
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13 | // Update Count : 231
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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 | // there are no intrinsic definitions of the function call operator
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261 | assert( false );
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262 | break;
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263 |
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264 | case OT_PREFIX:
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265 | case OT_PREFIXASSIGN:
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266 | assert( applicationExpr->get_args().size() == 1 );
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267 | output << "(";
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268 | output << opInfo.symbol;
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269 | (*arg)->accept( *this );
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270 | output << ")";
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271 | break;
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272 |
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273 | case OT_POSTFIX:
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274 | case OT_POSTFIXASSIGN:
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275 | assert( applicationExpr->get_args().size() == 1 );
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276 | (*arg)->accept( *this );
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277 | output << opInfo.symbol;
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278 | break;
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279 |
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280 | case OT_INFIX:
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281 | case OT_INFIXASSIGN:
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282 | assert( applicationExpr->get_args().size() == 2 );
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283 | output << "(";
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284 | (*arg++)->accept( *this );
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285 | output << opInfo.symbol;
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286 | (*arg)->accept( *this );
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287 | output << ")";
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288 | break;
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289 |
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290 | case OT_CONSTANT:
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291 | case OT_LABELADDRESS:
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292 | // there are no intrinsic definitions of 0/1 or label addresses as functions
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293 | assert( false );
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294 | }
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295 | } else {
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296 | varExpr->accept( *this );
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297 | output << "(";
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298 | genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
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299 | output << ")";
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300 | } // if
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301 | } else {
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302 | applicationExpr->get_function()->accept( *this );
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303 | output << "(";
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304 | genCommaList( applicationExpr->get_args().begin(), applicationExpr->get_args().end() );
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305 | output << ")";
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306 | } // if
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307 | }
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308 |
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309 | void CodeGenerator::visit( UntypedExpr *untypedExpr ) {
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310 | if ( NameExpr *nameExpr = dynamic_cast< NameExpr* >( untypedExpr->get_function() ) ) {
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311 | OperatorInfo opInfo;
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312 | if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
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313 | std::list< Expression* >::iterator arg = untypedExpr->get_args().begin();
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314 | switch ( opInfo.type ) {
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315 | case OT_INDEX:
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316 | assert( untypedExpr->get_args().size() == 2 );
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317 | (*arg++)->accept( *this );
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318 | output << "[";
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319 | (*arg)->accept( *this );
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320 | output << "]";
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321 | break;
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322 |
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323 | case OT_CALL:
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324 | assert( false );
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325 | break;
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326 |
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327 | case OT_PREFIX:
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328 | case OT_PREFIXASSIGN:
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329 | case OT_LABELADDRESS:
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330 | assert( untypedExpr->get_args().size() == 1 );
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331 | output << "(";
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332 | output << opInfo.symbol;
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333 | (*arg)->accept( *this );
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334 | output << ")";
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335 | break;
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336 |
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337 | case OT_POSTFIX:
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338 | case OT_POSTFIXASSIGN:
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339 | assert( untypedExpr->get_args().size() == 1 );
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340 | (*arg)->accept( *this );
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341 | output << opInfo.symbol;
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342 | break;
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343 |
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344 | case OT_INFIX:
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345 | case OT_INFIXASSIGN:
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346 | assert( untypedExpr->get_args().size() == 2 );
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347 | output << "(";
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348 | (*arg++)->accept( *this );
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349 | output << opInfo.symbol;
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350 | (*arg)->accept( *this );
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351 | output << ")";
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352 | break;
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353 |
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354 | case OT_CONSTANT:
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355 | // there are no intrinsic definitions of 0 or 1 as functions
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356 | assert( false );
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357 | }
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358 | } else {
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359 | nameExpr->accept( *this );
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360 | output << "(";
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361 | genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
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362 | output << ")";
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363 | } // if
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364 | } else {
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365 | untypedExpr->get_function()->accept( *this );
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366 | output << "(";
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367 | genCommaList( untypedExpr->get_args().begin(), untypedExpr->get_args().end() );
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368 | output << ")";
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369 | } // if
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370 | }
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371 |
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372 | void CodeGenerator::visit( NameExpr *nameExpr ) {
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373 | OperatorInfo opInfo;
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374 | if ( operatorLookup( nameExpr->get_name(), opInfo ) ) {
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375 | assert( opInfo.type == OT_CONSTANT );
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376 | output << opInfo.symbol;
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377 | } else {
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378 | output << nameExpr->get_name();
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379 | } // if
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380 | }
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381 |
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382 | void CodeGenerator::visit( AddressExpr *addressExpr ) {
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383 | output << "(&";
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384 | // this hack makes sure that we don't convert "constant_zero" to "0" if we're taking its address
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385 | if ( VariableExpr *variableExpr = dynamic_cast< VariableExpr* >( addressExpr->get_arg() ) ) {
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386 | output << mangleName( variableExpr->get_var() );
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387 | } else {
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388 | addressExpr->get_arg()->accept( *this );
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389 | } // if
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390 | output << ")";
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391 | }
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392 |
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393 | void CodeGenerator::visit( CastExpr *castExpr ) {
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394 | // if the cast is to an lvalue type, then the cast
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395 | // should be dropped, since the result of a cast is
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396 | // never an lvalue in C
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397 | if ( castExpr->get_results().front()->get_isLvalue() ) {
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398 | castExpr->get_arg()->accept( *this );
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399 | } else {
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400 | output << "((";
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401 | if ( castExpr->get_results().empty() ) {
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402 | output << "void" ;
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403 | } else {
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404 | output << genType( castExpr->get_results().front(), "" );
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405 | } // if
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406 | output << ")";
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407 | castExpr->get_arg()->accept( *this );
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408 | output << ")";
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409 | }
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410 | }
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411 |
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412 | void CodeGenerator::visit( UntypedMemberExpr *memberExpr ) {
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413 | assert( false );
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414 | }
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415 |
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416 | void CodeGenerator::visit( MemberExpr *memberExpr ) {
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417 | memberExpr->get_aggregate()->accept( *this );
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418 | output << "." << mangleName( memberExpr->get_member() );
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419 | }
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420 |
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421 | void CodeGenerator::visit( VariableExpr *variableExpr ) {
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422 | OperatorInfo opInfo;
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423 | if ( variableExpr->get_var()->get_linkage() == LinkageSpec::Intrinsic && operatorLookup( variableExpr->get_var()->get_name(), opInfo ) && opInfo.type == OT_CONSTANT ) {
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424 | output << opInfo.symbol;
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425 | } else {
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426 | output << mangleName( variableExpr->get_var() );
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427 | } // if
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428 | }
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429 |
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430 | void CodeGenerator::visit( ConstantExpr *constantExpr ) {
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431 | assert( constantExpr->get_constant() );
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432 | constantExpr->get_constant()->accept( *this );
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433 | }
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434 |
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435 | void CodeGenerator::visit( SizeofExpr *sizeofExpr ) {
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436 | output << "sizeof(";
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437 | if ( sizeofExpr->get_isType() ) {
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438 | output << genType( sizeofExpr->get_type(), "" );
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439 | } else {
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440 | sizeofExpr->get_expr()->accept( *this );
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441 | } // if
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442 | output << ")";
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443 | }
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444 |
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445 | void CodeGenerator::visit( LogicalExpr *logicalExpr ) {
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446 | output << "(";
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447 | logicalExpr->get_arg1()->accept( *this );
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448 | if ( logicalExpr->get_isAnd() ) {
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449 | output << " && ";
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450 | } else {
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451 | output << " || ";
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452 | } // if
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453 | logicalExpr->get_arg2()->accept( *this );
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454 | output << ")";
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455 | }
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456 |
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457 | void CodeGenerator::visit( ConditionalExpr *conditionalExpr ) {
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458 | output << "(";
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459 | conditionalExpr->get_arg1()->accept( *this );
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460 | output << " ? ";
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461 | conditionalExpr->get_arg2()->accept( *this );
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462 | output << " : ";
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463 | conditionalExpr->get_arg3()->accept( *this );
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464 | output << ")";
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465 | }
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466 |
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467 | void CodeGenerator::visit( CommaExpr *commaExpr ) {
|
---|
468 | output << "(";
|
---|
469 | commaExpr->get_arg1()->accept( *this );
|
---|
470 | output << " , ";
|
---|
471 | commaExpr->get_arg2()->accept( *this );
|
---|
472 | output << ")";
|
---|
473 | }
|
---|
474 |
|
---|
475 | void CodeGenerator::visit( TupleExpr *tupleExpr ) {}
|
---|
476 |
|
---|
477 | void CodeGenerator::visit( TypeExpr *typeExpr ) {}
|
---|
478 |
|
---|
479 | void CodeGenerator::visit( AsmExpr *asmExpr ) {
|
---|
480 | if ( asmExpr->get_inout() ) {
|
---|
481 | output << "[ ";
|
---|
482 | asmExpr->get_inout()->accept( *this );
|
---|
483 | output << " ] ";
|
---|
484 | } // if
|
---|
485 | asmExpr->get_constraint()->accept( *this );
|
---|
486 | output << " ( ";
|
---|
487 | asmExpr->get_operand()->accept( *this );
|
---|
488 | output << " )";
|
---|
489 | }
|
---|
490 |
|
---|
491 | //*** Statements
|
---|
492 | void CodeGenerator::visit( CompoundStmt *compoundStmt ) {
|
---|
493 | std::list<Statement*> ks = compoundStmt->get_kids();
|
---|
494 | output << "{" << endl;
|
---|
495 |
|
---|
496 | cur_indent += CodeGenerator::tabsize;
|
---|
497 |
|
---|
498 | for ( std::list<Statement *>::iterator i = ks.begin(); i != ks.end(); i++ ) {
|
---|
499 | output << indent << printLabels( (*i)->get_labels() );
|
---|
500 | (*i)->accept( *this );
|
---|
501 |
|
---|
502 | output << endl;
|
---|
503 | if ( wantSpacing( *i ) ) {
|
---|
504 | output << endl;
|
---|
505 | }
|
---|
506 | }
|
---|
507 | cur_indent -= CodeGenerator::tabsize;
|
---|
508 |
|
---|
509 | output << indent << "}";
|
---|
510 | }
|
---|
511 |
|
---|
512 | void CodeGenerator::visit( ExprStmt *exprStmt ) {
|
---|
513 | // I don't see why this check is necessary.
|
---|
514 | // If this starts to cause problems then put it back in,
|
---|
515 | // with an explanation
|
---|
516 | assert( exprStmt );
|
---|
517 |
|
---|
518 | // if ( exprStmt != 0 ) {
|
---|
519 | exprStmt->get_expr()->accept( *this );
|
---|
520 | output << ";" ;
|
---|
521 | // } // if
|
---|
522 | }
|
---|
523 |
|
---|
524 | void CodeGenerator::visit( AsmStmt *asmStmt ) {
|
---|
525 | output << "asm ";
|
---|
526 | if ( asmStmt->get_voltile() ) output << "volatile ";
|
---|
527 | if ( ! asmStmt->get_gotolabels().empty() ) output << "goto ";
|
---|
528 | output << "( ";
|
---|
529 | if ( asmStmt->get_instruction() ) asmStmt->get_instruction()->accept( *this );
|
---|
530 | output << " : ";
|
---|
531 | genCommaList( asmStmt->get_output().begin(), asmStmt->get_output().end() );
|
---|
532 | output << " : ";
|
---|
533 | genCommaList( asmStmt->get_input().begin(), asmStmt->get_input().end() );
|
---|
534 | output << " : ";
|
---|
535 | genCommaList( asmStmt->get_clobber().begin(), asmStmt->get_clobber().end() );
|
---|
536 | if ( ! asmStmt->get_gotolabels().empty() ) {
|
---|
537 | output << " : ";
|
---|
538 | for ( std::list<Label>::iterator begin = asmStmt->get_gotolabels().begin();; ) {
|
---|
539 | output << *begin++;
|
---|
540 | if ( begin == asmStmt->get_gotolabels().end() ) break;
|
---|
541 | output << ", ";
|
---|
542 | } // for
|
---|
543 | } // if
|
---|
544 | output << " );" ;
|
---|
545 | }
|
---|
546 |
|
---|
547 | void CodeGenerator::visit( IfStmt *ifStmt ) {
|
---|
548 | output << "if ( ";
|
---|
549 | ifStmt->get_condition()->accept( *this );
|
---|
550 | output << " ) ";
|
---|
551 |
|
---|
552 | ifStmt->get_thenPart()->accept( *this );
|
---|
553 |
|
---|
554 | if ( ifStmt->get_elsePart() != 0) {
|
---|
555 | output << " else ";
|
---|
556 | ifStmt->get_elsePart()->accept( *this );
|
---|
557 | } // if
|
---|
558 | }
|
---|
559 |
|
---|
560 | void CodeGenerator::visit( SwitchStmt *switchStmt ) {
|
---|
561 | output << "switch ( " ;
|
---|
562 | switchStmt->get_condition()->accept( *this );
|
---|
563 | output << " ) ";
|
---|
564 |
|
---|
565 | output << "{" << std::endl;
|
---|
566 | cur_indent += CodeGenerator::tabsize;
|
---|
567 |
|
---|
568 | acceptAll( switchStmt->get_branches(), *this );
|
---|
569 |
|
---|
570 | cur_indent -= CodeGenerator::tabsize;
|
---|
571 |
|
---|
572 | output << indent << "}";
|
---|
573 | }
|
---|
574 |
|
---|
575 | void CodeGenerator::visit( CaseStmt *caseStmt ) {
|
---|
576 | output << indent;
|
---|
577 | if ( caseStmt->isDefault()) {
|
---|
578 | output << "default";
|
---|
579 | } else {
|
---|
580 | output << "case ";
|
---|
581 | caseStmt->get_condition()->accept( *this );
|
---|
582 | } // if
|
---|
583 | output << ":\n";
|
---|
584 |
|
---|
585 | std::list<Statement *> sts = caseStmt->get_statements();
|
---|
586 |
|
---|
587 | cur_indent += CodeGenerator::tabsize;
|
---|
588 | for ( std::list<Statement *>::iterator i = sts.begin(); i != sts.end(); i++) {
|
---|
589 | output << indent << printLabels( (*i)->get_labels() ) ;
|
---|
590 | (*i)->accept( *this );
|
---|
591 | output << endl;
|
---|
592 | }
|
---|
593 | cur_indent -= CodeGenerator::tabsize;
|
---|
594 | }
|
---|
595 |
|
---|
596 | void CodeGenerator::visit( BranchStmt *branchStmt ) {
|
---|
597 | switch ( branchStmt->get_type()) {
|
---|
598 | case BranchStmt::Goto:
|
---|
599 | if ( ! branchStmt->get_target().empty() )
|
---|
600 | output << "goto " << branchStmt->get_target();
|
---|
601 | else {
|
---|
602 | if ( branchStmt->get_computedTarget() != 0 ) {
|
---|
603 | output << "goto *";
|
---|
604 | branchStmt->get_computedTarget()->accept( *this );
|
---|
605 | } // if
|
---|
606 | } // if
|
---|
607 | break;
|
---|
608 | case BranchStmt::Break:
|
---|
609 | output << "break";
|
---|
610 | break;
|
---|
611 | case BranchStmt::Continue:
|
---|
612 | output << "continue";
|
---|
613 | break;
|
---|
614 | }
|
---|
615 | output << ";";
|
---|
616 | }
|
---|
617 |
|
---|
618 |
|
---|
619 | void CodeGenerator::visit( ReturnStmt *returnStmt ) {
|
---|
620 | output << "return ";
|
---|
621 |
|
---|
622 | // xxx -- check for null expression;
|
---|
623 | if ( returnStmt->get_expr() ) {
|
---|
624 | returnStmt->get_expr()->accept( *this );
|
---|
625 | } // if
|
---|
626 | output << ";";
|
---|
627 | }
|
---|
628 |
|
---|
629 | void CodeGenerator::visit( WhileStmt *whileStmt ) {
|
---|
630 | if ( whileStmt->get_isDoWhile() )
|
---|
631 | output << "do" ;
|
---|
632 | else {
|
---|
633 | output << "while (" ;
|
---|
634 | whileStmt->get_condition()->accept( *this );
|
---|
635 | output << ")";
|
---|
636 | } // if
|
---|
637 | output << " ";
|
---|
638 |
|
---|
639 | output << CodeGenerator::printLabels( whileStmt->get_body()->get_labels() );
|
---|
640 | whileStmt->get_body()->accept( *this );
|
---|
641 |
|
---|
642 | output << indent;
|
---|
643 |
|
---|
644 | if ( whileStmt->get_isDoWhile() ) {
|
---|
645 | output << " while (" ;
|
---|
646 | whileStmt->get_condition()->accept( *this );
|
---|
647 | output << ");";
|
---|
648 | } // if
|
---|
649 | }
|
---|
650 |
|
---|
651 | void CodeGenerator::visit( ForStmt *forStmt ) {
|
---|
652 | // initialization is always hoisted, so don't
|
---|
653 | // bother doing anything with that
|
---|
654 | output << "for (;";
|
---|
655 |
|
---|
656 | if ( forStmt->get_condition() != 0 )
|
---|
657 | forStmt->get_condition()->accept( *this );
|
---|
658 | output << ";";
|
---|
659 |
|
---|
660 | if ( forStmt->get_increment() != 0 )
|
---|
661 | forStmt->get_increment()->accept( *this );
|
---|
662 | output << ") ";
|
---|
663 |
|
---|
664 | if ( forStmt->get_body() != 0 ) {
|
---|
665 | output << CodeGenerator::printLabels( forStmt->get_body()->get_labels() );
|
---|
666 | forStmt->get_body()->accept( *this );
|
---|
667 | } // if
|
---|
668 | }
|
---|
669 |
|
---|
670 | void CodeGenerator::visit( NullStmt *nullStmt ) {
|
---|
671 | //output << indent << CodeGenerator::printLabels( nullStmt->get_labels() );
|
---|
672 | output << "/* null statement */ ;";
|
---|
673 | }
|
---|
674 |
|
---|
675 | void CodeGenerator::visit( DeclStmt *declStmt ) {
|
---|
676 | declStmt->get_decl()->accept( *this );
|
---|
677 |
|
---|
678 | if ( doSemicolon( declStmt->get_decl() ) ) {
|
---|
679 | output << ";";
|
---|
680 | } // if
|
---|
681 | }
|
---|
682 |
|
---|
683 | std::string CodeGenerator::printLabels( std::list< Label > &l ) {
|
---|
684 | std::string str( "" );
|
---|
685 | l.unique(); // assumes a sorted list. Why not use set?
|
---|
686 |
|
---|
687 | for ( std::list< Label >::iterator i = l.begin(); i != l.end(); i++ )
|
---|
688 | str += *i + ": ";
|
---|
689 |
|
---|
690 | return str;
|
---|
691 | }
|
---|
692 |
|
---|
693 | void CodeGenerator::handleStorageClass( Declaration *decl ) {
|
---|
694 | switch ( decl->get_storageClass() ) {
|
---|
695 | case DeclarationNode::Extern:
|
---|
696 | output << "extern ";
|
---|
697 | break;
|
---|
698 | case DeclarationNode::Static:
|
---|
699 | output << "static ";
|
---|
700 | break;
|
---|
701 | case DeclarationNode::Auto:
|
---|
702 | // silently drop storage class
|
---|
703 | break;
|
---|
704 | case DeclarationNode::Register:
|
---|
705 | output << "register ";
|
---|
706 | break;
|
---|
707 | case DeclarationNode::Inline:
|
---|
708 | output << "inline ";
|
---|
709 | break;
|
---|
710 | case DeclarationNode::Fortran:
|
---|
711 | output << "fortran ";
|
---|
712 | break;
|
---|
713 | case DeclarationNode::Noreturn:
|
---|
714 | output << "_Noreturn ";
|
---|
715 | break;
|
---|
716 | case DeclarationNode::Threadlocal:
|
---|
717 | output << "_Thread_local ";
|
---|
718 | break;
|
---|
719 | case DeclarationNode::NoStorageClass:
|
---|
720 | break;
|
---|
721 | } // switch
|
---|
722 | }
|
---|
723 | } // namespace CodeGen
|
---|
724 |
|
---|
725 | // Local Variables: //
|
---|
726 | // tab-width: 4 //
|
---|
727 | // mode: c++ //
|
---|
728 | // compile-command: "make install" //
|
---|
729 | // End: //
|
---|