Mercurial > projects > ddmd
annotate dmd/CaseStatement.d @ 114:e28b18c23469
added a module dmd.common for commonly used stuff
it currently holds code for consistency checking of predefined versions
also added a VisualD project file
| author | Trass3r |
|---|---|
| date | Wed, 01 Sep 2010 18:21:58 +0200 |
| parents | 2e2a5c3f943a |
| children | fe932c1a9563 |
| rev | line source |
|---|---|
| 0 | 1 module dmd.CaseStatement; |
| 2 | |
| 114 | 3 import dmd.common; |
| 0 | 4 import dmd.Statement; |
| 5 import dmd.Expression; | |
| 6 import dmd.Statement; | |
| 7 import dmd.Scope; | |
| 8 import dmd.Loc; | |
| 9 import dmd.IRState; | |
| 10 import dmd.InlineScanState; | |
| 11 import dmd.HdrGenState; | |
| 12 import dmd.OutBuffer; | |
| 13 import dmd.InterState; | |
| 14 import dmd.BE; | |
| 15 import dmd.SwitchStatement; | |
| 16 import dmd.WANT; | |
| 17 import dmd.TOK; | |
| 18 import dmd.VarExp; | |
| 19 import dmd.VarDeclaration; | |
| 20 import dmd.Type; | |
| 21 import dmd.TY; | |
| 22 import dmd.IntegerExp; | |
| 23 import dmd.GotoCaseStatement; | |
| 24 | |
| 25 import dmd.backend.block; | |
| 26 import dmd.backend.Blockx; | |
| 27 import dmd.backend.Util; | |
| 28 import dmd.backend.BC; | |
| 29 | |
| 30 class CaseStatement : Statement | |
| 31 { | |
| 32 Expression exp; | |
| 33 Statement statement; | |
| 34 | |
| 35 int index = 0; // which case it is (since we sort this) | |
| 36 block* cblock = null; // back end: label for the block | |
| 37 | |
| 38 this(Loc loc, Expression exp, Statement s) | |
| 39 { | |
| 40 super(loc); | |
| 41 | |
| 42 this.exp = exp; | |
| 43 this.statement = s; | |
| 44 } | |
| 45 | |
| 72 | 46 override Statement syntaxCopy() |
| 0 | 47 { |
| 53 | 48 CaseStatement s = new CaseStatement(loc, exp.syntaxCopy(), statement.syntaxCopy()); |
| 49 return s; | |
| 0 | 50 } |
| 51 | |
| 72 | 52 override Statement semantic(Scope sc) |
| 0 | 53 { |
| 54 SwitchStatement sw = sc.sw; | |
| 55 | |
| 56 //printf("CaseStatement.semantic() %s\n", toChars()); | |
| 57 exp = exp.semantic(sc); | |
| 58 if (sw) | |
| 59 { | |
| 60 exp = exp.implicitCastTo(sc, sw.condition.type); | |
| 61 exp = exp.optimize(WANTvalue | WANTinterpret); | |
| 62 | |
| 63 /* This is where variables are allowed as case expressions. | |
| 64 */ | |
| 65 if (exp.op == TOKvar) | |
| 66 { VarExp ve = cast(VarExp)exp; | |
| 67 VarDeclaration v = ve.var.isVarDeclaration(); | |
| 68 Type t = exp.type.toBasetype(); | |
| 69 if (v && (t.isintegral() || t.ty == Tclass)) | |
| 70 { | |
| 71 /* Flag that we need to do special code generation | |
| 72 * for this, i.e. generate a sequence of if-then-else | |
| 73 */ | |
| 74 sw.hasVars = 1; | |
| 75 if (sw.isFinal) | |
| 76 error("case variables not allowed in final switch statements"); | |
| 77 goto L1; | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 if (exp.op != TOKstring && exp.op != TOKint64) | |
| 82 { | |
| 83 error("case must be a string or an integral constant, not %s", exp.toChars()); | |
| 84 exp = new IntegerExp(0); | |
| 85 } | |
| 86 | |
| 87 L1: | |
| 88 for (int i = 0; i < sw.cases.dim; i++) | |
| 89 { | |
| 90 CaseStatement cs = cast(CaseStatement)sw.cases.data[i]; | |
| 91 | |
| 92 //printf("comparing '%s' with '%s'\n", exp.toChars(), cs.exp.toChars()); | |
| 93 if (cs.exp.equals(exp)) | |
| 94 { | |
| 95 error("duplicate case %s in switch statement", exp.toChars()); | |
| 96 break; | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 sw.cases.push(cast(void*)this); | |
| 101 | |
| 102 // Resolve any goto case's with no exp to this case statement | |
| 103 for (int i = 0; i < sw.gotoCases.dim; i++) | |
| 104 { | |
| 105 GotoCaseStatement gcs = cast(GotoCaseStatement)sw.gotoCases.data[i]; | |
| 106 | |
| 107 if (!gcs.exp) | |
| 108 { | |
| 109 gcs.cs = this; | |
| 110 sw.gotoCases.remove(i); // remove from array | |
| 111 } | |
| 112 } | |
| 113 | |
| 114 if (sc.sw.tf !is sc.tf) | |
| 115 error("switch and case are in different finally blocks"); | |
| 116 } | |
| 117 else | |
| 118 error("case not in switch statement"); | |
| 119 statement = statement.semantic(sc); | |
| 120 return this; | |
| 121 } | |
| 122 | |
| 72 | 123 override int opCmp(Object obj) |
| 0 | 124 { |
|
68
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
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125 // Sort cases so we can do an efficient lookup |
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final bits of codegen implementation to compile Phobos
korDen
parents:
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126 CaseStatement cs2 = cast(CaseStatement)obj; |
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final bits of codegen implementation to compile Phobos
korDen
parents:
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changeset
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127 |
|
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
parents:
63
diff
changeset
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128 return exp.opCmp(cs2.exp); |
| 0 | 129 } |
| 130 | |
| 72 | 131 override bool usesEH() |
| 0 | 132 { |
| 133 assert(false); | |
| 134 } | |
| 135 | |
| 72 | 136 override BE blockExit() |
| 0 | 137 { |
| 138 return statement.blockExit(); | |
| 139 } | |
| 140 | |
| 72 | 141 override bool comeFrom() |
| 0 | 142 { |
| 143 return true; | |
| 144 } | |
| 145 | |
| 72 | 146 override Expression interpret(InterState istate) |
| 0 | 147 { |
| 148 assert(false); | |
| 149 } | |
| 150 | |
| 72 | 151 override void toCBuffer(OutBuffer buf, HdrGenState* hgs) |
| 0 | 152 { |
| 153 assert(false); | |
| 154 } | |
| 155 | |
| 72 | 156 override Statement inlineScan(InlineScanState* iss) |
| 0 | 157 { |
| 158 //printf("CaseStatement.inlineScan()\n"); | |
| 159 exp = exp.inlineScan(iss); | |
| 160 if (statement) | |
| 161 statement = statement.inlineScan(iss); | |
| 162 return this; | |
| 163 } | |
| 164 | |
| 72 | 165 override void toIR(IRState *irs) |
| 0 | 166 { |
| 167 Blockx* blx = irs.blx; | |
| 168 block* bcase = blx.curblock; | |
| 169 if (!cblock) | |
| 170 cblock = block_calloc(blx); | |
| 171 block_next(blx,BCgoto,cblock); | |
| 172 block* bsw = irs.getSwitchBlock(); | |
| 173 if (bsw.BC == BCswitch) | |
| 174 list_append(&bsw.Bsucc,cblock); // second entry in pair | |
| 175 list_append(&bcase.Bsucc,cblock); | |
| 176 if (blx.tryblock != bsw.Btry) | |
| 177 error("case cannot be in different try block level from switch"); | |
| 178 incUsage(irs, loc); | |
| 179 if (statement) | |
| 180 statement.toIR(irs); | |
| 181 } | |
| 72 | 182 } |