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1 module dmd.ExpStatement;
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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.AssertExp;
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6 import dmd.Expression;
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7 import dmd.OutBuffer;
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8 import dmd.HdrGenState;
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9 import dmd.Scope;
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10 import dmd.InterState;
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11 import dmd.InlineCostState;
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12 import dmd.InlineDoState;
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13 import dmd.InlineScanState;
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14 import dmd.IRState;
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15 import dmd.BE;
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16 import dmd.TOK;
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17 import dmd.DeclarationStatement;
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18
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19 import dmd.backend.Blockx;
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20 import dmd.backend.Util;
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21
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22 class ExpStatement : Statement
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23 {
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24 Expression exp;
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25
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26 this(Loc loc, Expression exp)
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27 {
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28 super(loc);
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29 this.exp = exp;
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30 }
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31
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32 Statement syntaxCopy()
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33 {
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34 Expression e = exp ? exp.syntaxCopy() : null;
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35 ExpStatement es = new ExpStatement(loc, e);
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36 return es;
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37 }
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38
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39 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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40 {
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41 if (exp)
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42 exp.toCBuffer(buf, hgs);
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43 buf.writeByte(';');
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44 if (!hgs.FLinit.init)
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45 buf.writenl();
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46 }
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47
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48 Statement semantic(Scope sc)
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49 {
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50 if (exp)
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51 {
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52 //printf("ExpStatement::semantic() %s\n", exp->toChars());
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53 exp = exp.semantic(sc);
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54 exp = resolveProperties(sc, exp);
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55 exp.checkSideEffect(0);
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56 exp = exp.optimize(0);
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57 if (exp.op == TOK.TOKdeclaration && !isDeclarationStatement())
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58 {
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59 Statement s = new DeclarationStatement(loc, exp);
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60 return s;
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61 }
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62 //exp = exp.optimize(isDeclarationStatement() ? WANT.WANTvalue : 0);
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63 }
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64 return this;
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65 }
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66
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67 Expression interpret(InterState* istate)
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68 {
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69 assert(false);
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70 }
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71
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72 BE blockExit()
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73 {
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74 BE result = BE.BEfallthru;
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75
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76 if (exp)
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77 {
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78 if (exp.op == TOK.TOKhalt)
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79 return BE.BEhalt;
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80 if (exp.op == TOK.TOKassert)
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81 {
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82 AssertExp a = cast(AssertExp)exp;
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83
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84 if (a.e1.isBool(false)) // if it's an assert(0)
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85 return BE.BEhalt;
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86 }
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87 if (exp.canThrow())
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88 result |= BE.BEthrow;
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89 }
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90 return result;
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91 }
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92
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93 int inlineCost(InlineCostState* ics)
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94 {
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95 return exp ? exp.inlineCost(ics) : 0;
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96 }
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97
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98 Expression doInline(InlineDoState ids)
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99 {
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100 version (LOG) {
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101 if (exp) printf("ExpStatement.doInline() '%s'\n", exp.toChars());
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102 }
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103 return exp ? exp.doInline(ids) : null;
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104 }
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105
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106 Statement inlineScan(InlineScanState* iss)
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107 {
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108 version (LOG) {
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109 printf("ExpStatement.inlineScan(%s)\n", toChars());
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110 }
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111 if (exp)
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112 exp = exp.inlineScan(iss);
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113 return this;
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114 }
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115
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116 void toIR(IRState* irs)
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117 {
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118 Blockx* blx = irs.blx;
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119
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120 //printf("ExpStatement.toIR(), exp = %s\n", exp ? exp.toChars() : "");
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121 incUsage(irs, loc);
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122 if (exp)
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123 block_appendexp(blx.curblock, exp.toElem(irs));
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124 }
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125 } |
