Mercurial > projects > dang

annotate parser/Action.d @ 48:b6c1dc30ca4b new_gen

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Only tests that dont pass now are structs and switches As far as the parser is concerned assignments are binary expressions Fixed a bug in codegen of if's - it is important to remember that the builder might be positioned at a new block after generating sub-statements
author Anders Halager <halager@gmail.com>
date Thu, 24 Apr 2008 19:42:53 +0200
parents 90fb4fdfefdd
children c7cde6af0095
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rev   line source
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1 module parser.Action;
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2
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3 import lexer.Token;
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4
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5 import ast.Exp,
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6 ast.Stmt,
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7 ast.Decl;
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8
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9 import misc.Error;
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10
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11 import tango.io.Stdout,
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12 Integer = tango.text.convert.Integer;
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13
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14 /**
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15 Used to indicate what type of operator is used in a given binary expression
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16 (and unary expressions?)
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17 */
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18 public enum Operator
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19 {
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20 Assign,
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21
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22 Eq, Ne,
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23
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24 Lt, Le,
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25 Gt, Ge,
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26
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27 Add, Sub,
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28 Mul, Div, Mod,
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29 }
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31
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32 struct Id
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33 {
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34 Token tok;
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35
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36 char[] toString()
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37 {
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38 return tok.get;
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39 }
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40 }
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41
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42 /**
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43 All methods are optional.
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44
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45 Warning: Interface is not stable yet. Use the `override` keyword in all classes
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46 inheriting from this to get warning if the interface changes.
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47 */
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48 abstract class Action
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49 {
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50 /**
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51 A few aliases to indicate what methods should be dealing with the same
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52 types.
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53
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54 Not typesafe, and not using typedef because users would need a lot of
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55 casts (and base type would be void*, so no possibility to synchronize,
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56 print etc.)
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57 */
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58 alias Object ExprT;
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59 alias Object StmtT; /// ditto
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60 alias Object DeclT; /// ditto
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61
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62 // -- Declarations --
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63
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64 /**
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65 Either we should have one case that handles a lot of things, or we should
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66 have a lot of separate cases.
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67 As an example, this method could handle the params in `int f(int, int)`
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68 as well as handling `int x` at both top-level, in classes and in methods.
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69
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70 The other solution is an addParamToFunc or similar.
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71 */
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72 DeclT actOnDeclarator(ref Id type, ref Id name, ExprT init)
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73 {
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74 return null;
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75 }
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76
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77 /**
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78 Add an initialization expression to a previously created decl.
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79
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80 Used for default values on function params and for values to local
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81 variables.
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82 */
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83 void addInitToDeclarator(DeclT decl, ExprT exp)
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84 {
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85 }
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86
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87 /**
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88 Called at the start of a function, doesn't get a lot of info - that is
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89 added later on, through addFuncArg and actOnEndOfFunction.
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90 */
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91 DeclT actOnStartOfFunctionDef(ref Id type, ref Id name)
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92 {
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93 return null;
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94 }
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95
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96 /**
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97 Add a new parameter to the function func.
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98 */
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99 void addFuncArg(DeclT func, Id type, Id name)
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100 {
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101 }
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102
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103 /**
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104 Finish off the function, by giving it the body (a single statement, so
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105 you probably want some sort of compound statement)
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106 */
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107 DeclT actOnEndOfFunction(DeclT func, StmtT stmts)
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108 {
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109 return func;
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110 }
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111
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112 // -- Statements --
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113
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114 /**
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115 Called after parsing a function/while/for/whatever body.
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116
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117 Note that stmts is to be considered temporary, it might point into the
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118 stack and needs to be copied before saving.
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119 */
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120 StmtT actOnCompoundStmt(ref Token left, ref Token right, StmtT[] stmts)
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121 {
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122 return null;
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123 }
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124
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125 /**
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126 An expression was used as a statement - this includes assignments,
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127 function calls.
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128
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129 Additionally the D spec dictates that expressions with no effect are not
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130 legal as statements, but the parser can't test for this so it has to be
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131 done in the later stages.
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132 */
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133 StmtT actOnExprStmt(ExprT exp)
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134 {
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135 return null;
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136 }
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137
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138 /**
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139 Called after parsing return statements.
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140
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141 loc is the return token.
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142 */
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143 StmtT actOnReturnStmt(ref Token loc, ExprT exp)
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144 {
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145 return null;
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146 }
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147
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148 /**
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149 */
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150 StmtT actOnIfStmt(ref Token ifTok, ExprT cond, StmtT thenBody,
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151 ref Token elseTok, StmtT elseBody)
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152 {
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153 return null;
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154 }
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155
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156 /**
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157 */
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158 StmtT actOnWhileStmt(ref Token whileTok, ExprT cond, StmtT whileBody)
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159 {
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160 return null;
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161 }
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162
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163 /**
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164 */
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165 StmtT actOnDeclStmt(DeclT decl)
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166 {
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167 return null;
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168 }
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169
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170 StmtT actOnStartOfSwitchStmt()
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171 {
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172 return null;
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173 }
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174
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175 void actOnCaseStmt()
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176 {
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177 }
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178
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179 void actOnDefaultStmt()
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180 {
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181 }
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182
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183 StmtT actOnFinishSwitchStmt(StmtT sw)
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184 {
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185 return sw;
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186 }
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187
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188 // -- Expressions --
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189
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190 /**
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191 A single numerical constant -- this can be absolutely any kind of number.
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192 Integers, floats, hex, octal, binary, imaginary and so on.
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193 */
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194 ExprT actOnNumericConstant(Token op)
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195 {
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196 return null;
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197 }
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198
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199 /**
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200 This is called when identifiers are used in expressions.
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201 */
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202 ExprT actOnIdentifierExp(Id id)
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203 {
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204 return null;
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205 }
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206
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207 /**
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208 Unary operator.
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209 */
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210 ExprT actOnUnaryOp(Token op, ExprT operand)
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211 {
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212 return null;
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213 }
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214
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215 /**
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216 Binary operator.
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217 */
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218 ExprT actOnBinaryOp(Operator op, ExprT l, ExprT r)
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219 {
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220 return null;
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221 }
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222
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223 /**
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224 Called when using the 'dot' operator.
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225 The left hand side can be any expression, but its only possible to look
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226 up an identifier.
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227 */
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228 ExprT actOnMemberReference(ExprT lhs, Location op, Id member)
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229 {
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230 return null;
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231 }
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232
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233 /**
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234 Called when function calls are encountered.
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235
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236 Note that args is temporary and might point into the stack. Remember to
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237 copy before saving a reference to it.
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238 */
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239 ExprT actOnCallExpr(ExprT func, ref Token left_paren, ExprT[] args,
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240 ref Token right_paren)
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241 {
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242 return null;
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243 }
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244 }
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245
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246 /**
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247 This class implements the default actions for Dang, by building up an AST
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248 with the data needed in a compiler.
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249 */
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250 class AstAction : Action
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251 {
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252 // -- Declarations --
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253 override DeclT actOnDeclarator(ref Id type, ref Id id, ExprT init)
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254 {
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255 Exp exp = cast(Exp)init;
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256 return new VarDecl(new Identifier(type.tok), new Identifier(id.tok), exp);
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257 }
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258
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259 override DeclT actOnStartOfFunctionDef(ref Id type, ref Id name)
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260 {
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261 return new FuncDecl(new Identifier(type.tok), new Identifier(name.tok));
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262 }
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263
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264 override void addFuncArg(DeclT func, Id type, Id name)
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265 {
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266 FuncDecl fd = cast(FuncDecl)func;
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267 fd.addParam(new Identifier(type.tok), new Identifier(name.tok));
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268 }
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269
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270 override DeclT actOnEndOfFunction(DeclT func, StmtT stmts)
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271 {
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272 FuncDecl fd = cast(FuncDecl)func;
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273 fd.setBody(cast(CompoundStatement)stmts);
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274 return fd;
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275 }
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276
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277 // -- Statements --
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278 override StmtT actOnCompoundStmt(ref Token l, ref Token r, StmtT[] stmts)
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279 {
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280 StmtT[] array = stmts.dup;
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281 Stmt[] statements = cast(Stmt[])array;
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282 return new CompoundStatement(statements);
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283 }
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284
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285 override StmtT actOnExprStmt(ExprT exp)
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286 {
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287 return new ExpStmt(cast(Exp)exp);
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288 }
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289
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290 override StmtT actOnReturnStmt(ref Token loc, ExprT exp)
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291 {
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292 Exp e = cast(Exp)exp;
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293 auto res = new ReturnStmt;
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294 res.exp = e;
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295 return res;
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296 }
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297
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298 override StmtT actOnIfStmt(ref Token ifTok, ExprT cond, StmtT thenBody,
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299 ref Token elseTok, StmtT elseBody)
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300 {
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301 Exp c = cast(Exp)cond;
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302 Stmt t = cast(Stmt)thenBody;
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303 Stmt e = cast(Stmt)elseBody;
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304 return new IfStmt(c, t, e);
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305 }
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306
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307 override StmtT actOnWhileStmt(ref Token tok, ExprT cond, StmtT whileBody)
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308 {
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309 Exp c = cast(Exp)cond;
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310 Stmt b = cast(Stmt)whileBody;
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311 return new WhileStmt(c, b);
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312 }
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313
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314 override StmtT actOnDeclStmt(DeclT decl)
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315 {
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316 Decl d = cast(Decl)decl;
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317 return new DeclStmt(d);
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318 }
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319
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320 // -- Expressions --
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321 override ExprT actOnNumericConstant(Token c)
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322 {
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323 return new IntegerLit(c);
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324 }
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325
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326 override ExprT actOnIdentifierExp(Id id)
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327 {
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328 return new Identifier(id.tok);
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329 }
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330
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331 override ExprT actOnBinaryOp(Operator op, ExprT l, ExprT r)
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332 {
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333 Exp left = cast(Exp)l;
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334 Exp right = cast(Exp)r;
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335 if (op == Operator.Assign)
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336 return new AssignExp(left, right);
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337 else
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338 return new BinaryExp(cast(BinaryExp.Operator)op, left, right);
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339 }
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340
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341 override ExprT actOnUnaryOp(Token op, ExprT operand)
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342 {
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343 Exp target = cast(Exp)operand;
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344 // can only be -x for now
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345 return new NegateExp(target);
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346 }
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347
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348 override ExprT actOnCallExpr(ExprT fn, ref Token, ExprT[] args, ref Token)
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349 {
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350 Exp f = cast(Exp)fn;
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351 Exp[] arguments = cast(Exp[])args.dup;
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352 return new CallExp(f, arguments);
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353 }
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354 }
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355