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annotate dmd/ArrayLengthExp.d @ 137:09c858522d55

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merge
author Trass3r
date Mon, 13 Sep 2010 23:29:00 +0200
parents 60bb0fe4563e
children 438eaa11eed4
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1 module dmd.ArrayLengthExp;
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2
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3 import dmd.common;
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4 import dmd.Expression;
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5 import dmd.BinExp;
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6 import dmd.backend.elem;
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7 import dmd.UnaExp;
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8 import dmd.InterState;
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9 import dmd.OutBuffer;
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10 import dmd.Loc;
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11 import dmd.Scope;
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12 import dmd.IRState;
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13 import dmd.HdrGenState;
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14 import dmd.TOK;
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15 import dmd.Type;
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16 import dmd.WANT;
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17 import dmd.VarExp;
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18 import dmd.VarDeclaration;
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19 import dmd.PtrExp;
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20 import dmd.Lexer;
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21 import dmd.Identifier;
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22 import dmd.ExpInitializer;
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23 import dmd.DeclarationExp;
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24 import dmd.CommaExp;
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25 import dmd.AssignExp;
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26 import dmd.AddrExp;
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27
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28 import dmd.expression.ArrayLength;
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29
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30 import dmd.backend.Util;
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31 import dmd.backend.OPER;
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32
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33 class ArrayLengthExp : UnaExp
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34 {
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35 this(Loc loc, Expression e1)
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36 {
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37 super(loc, TOK.TOKarraylength, ArrayLengthExp.sizeof, e1);
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38 }
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39
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40 override Expression semantic(Scope sc)
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41 {
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42 version (LOGSEMANTIC) {
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43 printf("ArrayLengthExp::semantic('%s')\n", toChars());
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44 }
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45 if (!type)
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46 {
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47 UnaExp.semantic(sc);
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48 e1 = resolveProperties(sc, e1);
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49
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50 type = Type.tsize_t;
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51 }
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52 return this;
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53 }
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54
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55 static Expression rewriteOpAssign(BinExp exp)
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56 {
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57 Expression e;
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58
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59 assert(exp.e1.op == TOKarraylength);
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60 auto ale = cast(ArrayLengthExp)exp.e1;
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61 if (ale.e1.op == TOK.TOKvar)
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62 {
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63 e = opAssignToOp(exp.loc, exp.op, ale, exp.e2);
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64 e = new AssignExp(exp.loc, ale.syntaxCopy(), e);
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65 }
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66 else
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67 {
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68 /* auto tmp = &array;
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69 * (*tmp).length = (*tmp).length op e2
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70 */
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71 Identifier id = Lexer.uniqueId("__arraylength");
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72 ExpInitializer ei = new ExpInitializer(ale.loc, new AddrExp(ale.loc, ale.e1));
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73 VarDeclaration tmp = new VarDeclaration(ale.loc, ale.e1.type.pointerTo(), id, ei);
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74
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75 Expression e1 = new ArrayLengthExp(ale.loc, new PtrExp(ale.loc, new VarExp(ale.loc, tmp)));
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76 Expression elvalue = e1.syntaxCopy();
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77 e = opAssignToOp(exp.loc, exp.op, e1, exp.e2);
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78 e = new AssignExp(exp.loc, elvalue, e);
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79 e = new CommaExp(exp.loc, new DeclarationExp(ale.loc, tmp), e);
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80 }
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81 return e;
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82 }
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84 override Expression optimize(int result)
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85 {
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86 //printf("ArrayLengthExp::optimize(result = %d) %s\n", result, toChars());
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87 e1 = e1.optimize(WANTvalue | (result & WANTinterpret));
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88 Expression e = this;
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89 if (e1.op == TOKstring || e1.op == TOKarrayliteral || e1.op == TOKassocarrayliteral)
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90 {
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91 e = ArrayLength(type, e1);
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92 }
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93 return e;
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94 }
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96 override Expression interpret(InterState istate)
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97 {
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98 assert(false);
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99 }
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100
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101 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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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 override elem* toElem(IRState* irs)
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107 {
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108 elem *e = e1.toElem(irs);
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109 e = el_una(OP64_32, type.totym(), e);
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110 el_setLoc(e,loc);
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111 return e;
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112 }
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113 }
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114