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1 module dmd.Statement;
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2
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114
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3 import dmd.common;
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4 import dmd.TryCatchStatement;
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5 import dmd.GotoStatement;
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6 import dmd.AsmStatement;
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7 import dmd.ScopeStatement;
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8 import dmd.DeclarationStatement;
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9 import dmd.CompoundStatement;
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10 import dmd.ReturnStatement;
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11 import dmd.IfStatement;
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12 import dmd.Scope;
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13 import dmd.Loc;
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14 import dmd.OutBuffer;
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15 import dmd.HdrGenState;
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16 import dmd.ArrayTypes;
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17 import dmd.Expression;
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18 import dmd.InterState;
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19 import dmd.InlineCostState;
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20 import dmd.InlineDoState;
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21 import dmd.InlineScanState;
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22 import dmd.IRState;
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23 import dmd.BE;
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24 import dmd.Global;
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155
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25 import dmd.GlobalExpressions;
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26 import dmd.Util;
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27
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174
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28 import std.stdio;
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29
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30 //! startup code used in *Statement.interpret() functions
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31 enum START = `
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32 if (istate.start)
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33 {
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34 if (istate.start !is this)
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35 return null;
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36 istate.start = null;
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37 }
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38 `;
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63
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39
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178
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40 import dmd.TObject;
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41
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42 class Statement : TObject
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43 {
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44 Loc loc;
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45
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46 this(Loc loc)
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47 {
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48 register();
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49 this.loc = loc;
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50 }
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51
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52 Statement syntaxCopy()
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53 {
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54 assert(false);
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55 }
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56
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57 void print()
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58 {
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59 assert(false);
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60 }
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61
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62 string toChars()
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63 {
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64 /*scope*/ OutBuffer buf = new OutBuffer();
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65 HdrGenState hgs;
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66
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67 toCBuffer(buf, &hgs);
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68 return buf.toChars();
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69 }
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70
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71 void error(T...)(string format, T t)
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72 {
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73 .error(loc, format, t);
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74 }
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75
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76 void warning(T...)(string format, T t)
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77 {
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78 if (global.params.warnings && !global.gag)
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79 {
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80 writef("warning - ");
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81 .error(loc, format, t);
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82 }
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83 }
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84
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85 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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86 {
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87 assert(false);
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88 }
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89
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90 TryCatchStatement isTryCatchStatement() { return null; }
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91
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92 GotoStatement isGotoStatement() { return null; }
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93
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94 AsmStatement isAsmStatement() { return null; }
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95
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96 version (_DH) {
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97 int incontract;
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98 }
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99 ScopeStatement isScopeStatement() { return null; }
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100
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101 Statement semantic(Scope sc)
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102 {
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103 assert(false);
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104 }
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105
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106 Statement semanticScope(Scope sc, Statement sbreak, Statement scontinue)
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107 {
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108 Scope scd;
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109 Statement s;
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110
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111 scd = sc.push();
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112 if (sbreak)
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113 scd.sbreak = sbreak;
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114 if (scontinue)
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115 scd.scontinue = scontinue;
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116 s = semantic(scd);
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117 scd.pop();
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118 return s;
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119 }
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120
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121 bool hasBreak()
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122 {
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123 assert(false);
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124 }
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125
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126 bool hasContinue()
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127 {
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128 assert(false);
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129 }
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130
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131 // TRUE if statement uses exception handling
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132
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133 bool usesEH()
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134 {
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135 return false;
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136 }
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137
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138 BE blockExit()
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139 {
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140 assert(false);
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141 }
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142
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143 // true if statement 'comes from' somewhere else, like a goto
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144 bool comeFrom()
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145 {
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146 //printf("Statement::comeFrom()\n");
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147 return false;
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148 }
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149
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150 // Return TRUE if statement has no code in it
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151 bool isEmpty()
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152 {
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153 //printf("Statement::isEmpty()\n");
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154 return false;
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155 }
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156
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157 /****************************************
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158 * If this statement has code that needs to run in a finally clause
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159 * at the end of the current scope, return that code in the form of
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160 * a Statement.
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161 * Output:
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162 * *sentry code executed upon entry to the scope
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163 * *sexception code executed upon exit from the scope via exception
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164 * *sfinally code executed in finally block
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165 */
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166 void scopeCode(Scope sc, Statement* sentry, Statement* sexception, Statement* sfinally)
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167 {
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168 //printf("Statement::scopeCode()\n");
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169 //print();
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170 *sentry = null;
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171 *sexception = null;
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172 *sfinally = null;
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173 }
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174
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175 /*********************************
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176 * Flatten out the scope by presenting the statement
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177 * as an array of statements.
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178 * Returns NULL if no flattening necessary.
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179 */
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180 Statements flatten(Scope sc)
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181 {
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182 return null;
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183 }
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184
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185 /***********************************
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186 * Interpret the statement.
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187 * Returns:
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188 * null continue to next statement
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189 * EXP_CANT_INTERPRET cannot interpret statement at compile time
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190 * !null expression from return statement
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191 */
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192 Expression interpret(InterState istate)
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193 {
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194 version(LOG)
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195 writef("Statement::interpret()\n");
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196
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197 mixin(START);
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198 error("Statement %s cannot be interpreted at compile time", this.toChars());
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199 return EXP_CANT_INTERPRET;
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200 }
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201
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202 int inlineCost(InlineCostState* ics)
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203 {
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204 return COST_MAX; // default is we can't inline it
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205 }
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206
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207 Expression doInline(InlineDoState ids)
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208 {
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209 assert(false);
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210 }
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211
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212 Statement inlineScan(InlineScanState* iss)
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213 {
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214 return this;
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215 }
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216
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217 // Back end
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218 void toIR(IRState* irs)
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219 {
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220 assert(false);
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221 }
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222
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223 // Avoid dynamic_cast
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224 DeclarationStatement isDeclarationStatement() { return null; }
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225 CompoundStatement isCompoundStatement() { return null; }
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226 ReturnStatement isReturnStatement() { return null; }
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227 IfStatement isIfStatement() { return null; }
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174
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228 }
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