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1 module dmd.ThrowStatement;
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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.Statement;
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5 import dmd.Expression;
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6 import dmd.Loc;
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7 import dmd.IRState;
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8 import dmd.InlineScanState;
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9 import dmd.HdrGenState;
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10 import dmd.OutBuffer;
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11 import dmd.Scope;
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12 import dmd.Expression;
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13 import dmd.FuncDeclaration;
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14 import dmd.BE;
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15
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16 import dmd.backend.Util;
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17 import dmd.backend.Blockx;
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18 import dmd.backend.elem;
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19 import dmd.backend.RTLSYM;
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20 import dmd.backend.OPER;
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21 import dmd.backend.TYM;
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22
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23 class ThrowStatement : Statement
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24 {
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25 Expression exp;
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26
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27 this(Loc loc, Expression exp)
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28 {
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29 super(loc);
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30 this.exp = exp;
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31 }
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32
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33 override Statement syntaxCopy()
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34 {
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35 ThrowStatement s = new ThrowStatement(loc, exp.syntaxCopy());
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36 return s;
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37 }
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38
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39 override Statement semantic(Scope sc)
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40 {
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41 //printf("ThrowStatement::semantic()\n");
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42
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43 FuncDeclaration fd = sc.parent.isFuncDeclaration();
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44 fd.hasReturnExp |= 2;
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45
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46 if (sc.incontract)
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47 error("Throw statements cannot be in contracts");
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48 exp = exp.semantic(sc);
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49 exp = resolveProperties(sc, exp);
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50 if (!exp.type.toBasetype().isClassHandle())
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51 error("can only throw class objects, not type %s", exp.type.toChars());
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52 return this;
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53 }
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54
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72
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55 override void toCBuffer(OutBuffer buf, HdrGenState* hgs)
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56 {
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57 assert(false);
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58 }
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59
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60 override BE blockExit()
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61 {
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62 return BE.BEthrow; // obviously
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63 }
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64
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65 override Statement inlineScan(InlineScanState* iss)
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66 {
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67 if (exp)
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68 exp = exp.inlineScan(iss);
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69 return this;
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70 }
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71
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72
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72 override void toIR(IRState* irs)
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73 {
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74 // throw(exp)
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75
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76 Blockx *blx = irs.blx;
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77
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78 incUsage(irs, loc);
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79 elem *e = exp.toElem(irs);
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80 static if (false) {
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81 e = el_bin(OPcall, TYvoid, el_var(rtlsym[RTLSYM_LTHROW]),e);
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82 } else {
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83 e = el_bin(OPcall, TYvoid, el_var(rtlsym[RTLSYM_THROW]),e);
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84 }
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85 block_appendexp(blx.curblock, e);
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86 }
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72
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87 }
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