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annotate parser/Action.d @ 94:48bb2287c035 new_gen

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Added Modules. Right now it's very simple - will grow with time and need.
author Anders Johnsen <skabet@gmail.com>
date Tue, 06 May 2008 16:24:14 +0200
parents eb5b2c719a39
children 857f0d530789
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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 misc.Error;
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6
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7 /**
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8 Used to indicate what type of operator is used in a given binary expression
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9 (and unary expressions?)
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10 */
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11 public enum Operator
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12 {
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13 Assign,
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14
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15 Eq, Ne,
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17 Lt, Le,
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18 Gt, Ge,
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19
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20 Add, Sub,
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21 Mul, Div, Mod,
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22 }
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24
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25 class Id
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26 {
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27 public static Id opCall(Token tok)
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28 {
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29 auto id = new Id();
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30 id.tok = tok;
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31 return id;
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32 }
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33 Token tok;
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34 }
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35
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36 class PointerId : Id
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37 {
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38 public static PointerId opCall(Id id)
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39 {
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40 auto p = new PointerId();
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41 p.id = id;
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42 return p;
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43 }
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45 Id id;
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46 }
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47
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48 class ArrayId : Id
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49 {
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50 public static ArrayId opCall(Id id, Object number)
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51 {
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52 auto a = new ArrayId();
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53 a.id = id;
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54 a.number = number;
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55 return a;
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56 }
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57
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58 Id id;
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59 Object number;
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60 }
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61
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62 /**
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63 All methods are optional.
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64
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65 Warning: Interface is not stable yet. Use the `override` keyword in all classes
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66 inheriting from this to get warning if the interface changes.
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67 */
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68 abstract class Action
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69 {
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70 /**
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71 A few aliases to indicate what methods should be dealing with the same
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72 types.
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73
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74 Not typesafe, and not using typedef because users would need a lot of
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75 casts (and base type would be void*, so no possibility to synchronize,
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76 print etc.)
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77 */
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78 alias Object ExprT;
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79 alias Object StmtT; /// ditto
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80 alias Object DeclT; /// ditto
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81 alias Object ModuleT; /// ditto
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82
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83 // -- Modules --
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84
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85 ModuleT actOnModule(char[] name)
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86 {
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87 return null;
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88 }
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89
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90 void actOnModuleDecl(ModuleT m, DeclT d)
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91 {
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92 }
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93
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94 // -- Declarations --
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95
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96 /**
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97 Either we should have one case that handles a lot of things, or we should
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98 have a lot of separate cases.
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99 As an example, this method could handle the params in `int f(int, int)`
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100 as well as handling `int x` at both top-level, in classes and in methods.
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101
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102 The other solution is an addParamToFunc or similar.
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103 */
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104 DeclT actOnDeclarator(ref Id type, ref Id name, ExprT init)
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105 {
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106 return null;
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107 }
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108
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109 /**
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110 Add a struct member to a struct.
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111 */
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112 void actOnStructMember(DeclT decl, ref Id type, ref Id name, ExprT init)
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113 {
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114 return null;
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115 }
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116
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117 /**
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118 Add an initialization expression to a previously created decl.
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119
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120 Used for default values on function params and for values to local
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121 variables.
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122 */
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123 void addInitToDeclarator(DeclT decl, ExprT exp)
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124 {
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125 }
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126
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127 /**
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128 Called at the start of a function, doesn't get a lot of info - that is
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129 added later on, through addFuncArg and actOnEndOfFunction.
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130 */
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131 DeclT actOnStartOfFunctionDef(ref Id type, ref Id name)
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132 {
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133 return null;
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134 }
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135
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136 /**
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137 Add a new parameter to the function func.
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138 */
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139 void addFuncArg(DeclT func, Id type, Id name)
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140 {
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141 }
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142
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143 /**
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144 Finish off the function, by giving it the body (a single statement, so
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145 you probably want some sort of compound statement)
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146 */
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147 DeclT actOnEndOfFunction(DeclT func, StmtT stmts)
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148 {
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149 return func;
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150 }
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151
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152 // -- Statements --
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153
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154 /**
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155 Called after parsing a function/while/for/whatever body.
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156
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157 Note that stmts is to be considered temporary, it might point into the
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158 stack and needs to be copied before saving.
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159 */
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160 StmtT actOnCompoundStmt(ref Token left, ref Token right, StmtT[] stmts)
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161 {
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162 return null;
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163 }
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164
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165 /**
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166 An expression was used as a statement - this includes assignments,
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167 function calls.
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168
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169 Additionally the D spec dictates that expressions with no effect are not
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170 legal as statements, but the parser can't test for this so it has to be
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171 done in the later stages.
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172 */
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173 StmtT actOnExprStmt(ExprT exp)
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174 {
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175 return null;
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176 }
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177
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178 /**
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179 Called after parsing return statements.
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180
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181 loc is the return token.
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182 */
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183 StmtT actOnReturnStmt(ref Token loc, ExprT exp)
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184 {
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185 return null;
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186 }
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187
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188 /**
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189 */
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190 StmtT actOnIfStmt(ref Token ifTok, ExprT cond, StmtT thenBody,
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191 ref Token elseTok, StmtT elseBody)
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192 {
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193 return null;
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194 }
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195
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196 /**
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197 */
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198 StmtT actOnWhileStmt(ref Token whileTok, ExprT cond, StmtT whileBody)
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199 {
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200 return null;
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201 }
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202
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203 /**
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204 */
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205 StmtT actOnDeclStmt(DeclT decl)
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206 {
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207 return null;
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208 }
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209
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210 StmtT actOnStartOfSwitchStmt()
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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 void actOnCaseStmt()
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216 {
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217 }
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218
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219 void actOnDefaultStmt()
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220 {
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221 }
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222
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223 StmtT actOnFinishSwitchStmt(StmtT sw)
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224 {
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225 return sw;
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226 }
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227
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228 // -- Expressions --
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229
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230 /**
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231 A single numerical constant -- this can be absolutely any kind of number.
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232 Integers, floats, hex, octal, binary, imaginary and so on.
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233 */
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234 ExprT actOnNumericConstant(Token op)
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235 {
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236 return null;
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237 }
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238
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239 /**
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240 This is called when identifiers are used in expressions.
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241 */
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242 ExprT actOnIdentifierExp(Id id)
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243 {
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244 return null;
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245 }
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246
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247 /**
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248 Unary operator.
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249 */
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250 ExprT actOnUnaryOp(Token op, ExprT operand)
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251 {
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252 return null;
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253 }
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254
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255 /**
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256 Binary operator.
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257 */
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258 ExprT actOnBinaryOp(SLoc op_loc, Operator op, ExprT l, ExprT r)
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259 {
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260 return null;
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261 }
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262
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263 /**
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264 Called when using the 'dot' operator.
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265 The left hand side can be any expression, but its only possible to look
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266 up an identifier.
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267 */
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268 ExprT actOnMemberReference(ExprT lhs, SourceLocation op, Id member)
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269 {
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270 return null;
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271 }
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272
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273 /**
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274 Called when function calls are encountered.
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275
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276 Note that args is temporary and might point into the stack. Remember to
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277 copy before saving a reference to it.
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278 */
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279 ExprT actOnCallExpr(ExprT func, ref Token left_paren, ExprT[] args,
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280 ref Token right_paren)
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281 {
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282 return null;
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283 }
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284
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285 /**
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286 Called when function calls are encountered.
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287 */
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288 ExprT actOnIndexEpr(ExprT array, ref Token left_bracket, ExprT index,
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289 ref Token right_bracket)
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290 {
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291 return null;
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292 }
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293
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294 /**
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295 Cast expression.
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296 */
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297 ExprT actOnCastExpr(ref Token _cast, Id type, ExprT exp)
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298 {
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299 return null;
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300 }
44
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301 }
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302
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303 /**
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304 Doesn't do anything at all - can be used for benchmarking the parser.
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305 */
c7cde6af0095 Seperated the AST from LLVM
Anders Halager <halager@gmail.com>
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306 class NullAction : Action
c7cde6af0095 Seperated the AST from LLVM
Anders Halager <halager@gmail.com>
parents: 48
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307 {
c7cde6af0095 Seperated the AST from LLVM
Anders Halager <halager@gmail.com>
parents: 48
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308 }
c7cde6af0095 Seperated the AST from LLVM
Anders Halager <halager@gmail.com>
parents: 48
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309