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1 module dmd.CompoundStatement;
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2
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3 import dmd.Loc;
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4 import dmd.Statement;
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5 import dmd.Array;
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6 import dmd.TryCatchStatement;
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7 import dmd.TryFinallyStatement;
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8 import dmd.Catch;
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9 import dmd.ScopeStatement;
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10 import dmd.Identifier;
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11 import dmd.Lexer;
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12 import dmd.ThrowStatement;
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13 import dmd.IdentifierExp;
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14 import dmd.Scope;
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15 import dmd.OutBuffer;
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16 import dmd.HdrGenState;
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17 import dmd.ArrayTypes;
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18 import dmd.ReturnStatement;
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19 import dmd.Expression;
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20 import dmd.InterState;
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21 import dmd.InlineDoState;
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22 import dmd.InlineCostState;
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23 import dmd.InlineScanState;
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24 import dmd.IfStatement;
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25 import dmd.IRState;
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26 import dmd.BE;
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27 import dmd.Util;
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28
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29 class CompoundStatement : Statement
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30 {
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31 Statements statements;
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32
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33 this(Loc loc, Statements s)
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34 {
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35 super(loc);
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36 statements = s;
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37 }
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38
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39 this(Loc loc, Statement s1, Statement s2)
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40 {
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41 super(loc);
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42
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43 statements = new Statements();
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44 statements.reserve(2);
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45 statements.push(cast(void*)s1);
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46 statements.push(cast(void*)s2);
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47 }
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48
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49 Statement syntaxCopy()
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50 {
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51 Statements a = new Statements();
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52 a.setDim(statements.dim);
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53
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54 for (size_t i = 0; i < statements.dim; i++)
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55 {
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56 Statement s = cast(Statement)statements.data[i];
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57 if (s)
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58 s = s.syntaxCopy();
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59 a.data[i] = cast(void*)s;
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60 }
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61
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62 return new CompoundStatement(loc, a);
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63 }
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64
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65 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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66 {
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67 assert(false);
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68 }
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69
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70 static int indent = 0;
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71 static int depth = 0;
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72
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73 Statement semantic(Scope sc)
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74 {
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75 Statement s;
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76
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77 //printf("CompoundStatement.semantic(this = %p, sc = %p)\n", this, sc);
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78
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79 for (size_t i = 0; i < statements.dim; )
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80 {
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81 s = cast(Statement) statements.data[i];
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82 if (s)
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83 {
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84 Statements a = s.flatten(sc);
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85
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86 if (a)
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87 {
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88 statements.remove(i);
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89 statements.insert(i, a);
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90 continue;
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91 }
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92
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93 statements.data[i] = cast(void*)s;
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94 if (s)
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95 {
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96 Statement sentry;
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97 Statement sexception;
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98 Statement sfinally;
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99
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100 s.scopeCode(sc, &sentry, &sexception, &sfinally);
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101 if (sentry)
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102 {
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103 sentry = sentry.semantic(sc);
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104 if (s.isDeclarationStatement())
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105 {
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106 statements.insert(i, cast(void*)sentry);
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107 i++;
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108 }
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109 else
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110 statements.data[i] = cast(void*)sentry;
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111 }
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112 if (sexception)
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113 {
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114 if (i + 1 == statements.dim && !sfinally)
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115 {
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116 static if (true) {
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117 sexception = sexception.semantic(sc);
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118 } else {
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119 statements.push(sexception);
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120 if (sfinally)
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121 // Assume sexception does not throw
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122 statements.push(sfinally);
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123 }
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124 }
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125 else
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126 {
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127 /* Rewrite:
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128 * s; s1; s2;
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129 * As:
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130 * s;
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131 * try { s1; s2; }
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132 * catch (Object __o)
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133 * { sexception; throw __o; }
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134 */
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135 Statement body_;
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136 Statements aa = new Statements();
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137
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138 for (int j = i + 1; j < statements.dim; j++)
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139 {
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140 aa.push(statements.data[j]);
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141 }
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142 body_ = new CompoundStatement(Loc(0), aa);
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143 body_ = new ScopeStatement(Loc(0), body_);
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144
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145 Identifier id = Lexer.uniqueId("__o");
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146
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147 Statement handler = new ThrowStatement(Loc(0), new IdentifierExp(Loc(0), id));
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148 handler = new CompoundStatement(Loc(0), sexception, handler);
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149
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150 Array catches = new Array();
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151 Catch ctch = new Catch(Loc(0), null, id, handler);
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152 catches.push(cast(void*)ctch);
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153 s = new TryCatchStatement(Loc(0), body_, catches);
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154
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155 if (sfinally)
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156 s = new TryFinallyStatement(Loc(0), s, sfinally);
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157 s = s.semantic(sc);
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158 statements.setDim(i + 1);
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159 statements.push(cast(void*)s);
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160 break;
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161 }
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162 }
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163 else if (sfinally)
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164 {
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165 if (0 && i + 1 == statements.dim)
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166 {
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167 statements.push(cast(void*)sfinally);
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168 }
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169 else
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170 {
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171 /* Rewrite:
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172 * s; s1; s2;
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173 * As:
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174 * s; try { s1; s2; } finally { sfinally; }
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175 */
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176 Statement body_;
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177 Statements aa = new Statements();
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178
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179 for (int j = i + 1; j < statements.dim; j++)
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180 {
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181 aa.push(statements.data[j]);
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182 }
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183 body_ = new CompoundStatement(Loc(0), aa);
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184 s = new TryFinallyStatement(Loc(0), body_, sfinally);
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185 s = s.semantic(sc);
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186 statements.setDim(i + 1);
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187 statements.push(cast(void*)s);
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188 break;
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189 }
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190 }
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191 }
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192 }
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193 i++;
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194 }
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195 if (statements.dim == 1)
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196 {
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197 return cast(Statement)statements.data[0];
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198 }
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199 return this;
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200 }
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201
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202 bool usesEH()
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203 {
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204 assert(false);
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205 }
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206
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207 BE blockExit()
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208 {
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209 //printf("CompoundStatement::blockExit(%p) %d\n", this, statements->dim);
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210 BE result = BE.BEfallthru;
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211 for (size_t i = 0; i < statements.dim; i++)
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212 { Statement s = cast(Statement)statements.data[i];
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213 if (s)
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214 {
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215 //printf("result = x%x\n", result);
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216 //printf("%s\n", s->toChars());
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217 if (!(result & BE.BEfallthru) && !s.comeFrom())
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218 {
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219 if (s.blockExit() != BE.BEhalt)
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220 s.warning("statement is not reachable");
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221 }
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222
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223 result &= ~BE.BEfallthru;
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224 result |= s.blockExit();
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225 }
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226 }
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227
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228 return result;
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229 }
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230
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231 bool comeFrom()
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232 {
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233 assert(false);
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234 }
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235
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236 bool isEmpty()
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237 {
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238 for (int i = 0; i < statements.dim; i++)
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239 {
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240 Statement s = cast(Statement) statements.data[i];
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241 if (s && !s.isEmpty())
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242 return false;
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243 }
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244 return true;
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245 }
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246
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247 Statements flatten(Scope sc)
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248 {
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249 return statements;
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250 }
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251
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252 ReturnStatement isReturnStatement()
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253 {
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254 ReturnStatement rs = null;
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255
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256 for (int i = 0; i < statements.dim; i++)
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257 {
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258 Statement s = cast(Statement) statements.data[i];
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259 if (s)
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260 {
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261 rs = s.isReturnStatement();
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262 if (rs)
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263 break;
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264 }
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265 }
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266 return rs;
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267 }
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268
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269 Expression interpret(InterState* istate)
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270 {
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271 assert(false);
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272 }
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273
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274 int inlineCost(InlineCostState* ics)
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275 {
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276 int cost = 0;
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277
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278 for (size_t i = 0; i < statements.dim; i++)
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279 {
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280 Statement s = cast(Statement)statements.data[i];
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281 if (s)
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282 {
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283 cost += s.inlineCost(ics);
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284 if (cost >= COST_MAX)
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285 break;
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286 }
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287 }
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288
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289 return cost;
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290 }
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291
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292 Expression doInline(InlineDoState ids)
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293 {
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294 Expression e = null;
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295
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296 //printf("CompoundStatement.doInline() %d\n", statements.dim);
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297 for (size_t i = 0; i < statements.dim; i++)
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298 {
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299 Statement s = cast(Statement)statements.data[i];
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300 if (s)
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301 {
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302 Expression e2 = s.doInline(ids);
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303 e = Expression.combine(e, e2);
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304 if (s.isReturnStatement())
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305 break;
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306
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307 /* Check for:
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308 * if (condition)
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309 * return exp1;
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310 * else
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311 * return exp2;
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312 */
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313 IfStatement ifs = s.isIfStatement();
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314 if (ifs && ifs.elsebody && ifs.ifbody &&
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315 ifs.ifbody.isReturnStatement() &&
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316 ifs.elsebody.isReturnStatement()
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317 )
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318 break;
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319 }
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320 }
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321 return e;
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322 }
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323
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324 Statement inlineScan(InlineScanState* iss)
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325 {
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326 for (size_t i = 0; i < statements.dim; i++)
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327 {
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328 Statement s = cast(Statement) statements.data[i];
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329 if (s)
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330 statements.data[i] = cast(void*)s.inlineScan(iss);
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331 }
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332
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333 return this;
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334 }
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335
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336 void toIR(IRState* irs)
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337 {
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338 if (statements)
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339 {
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340 size_t dim = statements.dim;
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341 for (size_t i = 0 ; i < dim ; i++)
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342 {
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343 Statement s = cast(Statement)statements.data[i];
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344 if (s !is null)
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345 {
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346 s.toIR(irs);
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347 }
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348 }
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349 }
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350 }
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351
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352 CompoundStatement isCompoundStatement() { return this; }
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353 } |
