Mercurial > projects > ddmd
annotate dmd/CaseStatement.d @ 68:ee3a9f34dc48
final bits of codegen implementation to compile Phobos
| author | korDen |
|---|---|
| date | Tue, 24 Aug 2010 16:44:34 +0400 |
| parents | cab4c37afb89 |
| children | 2e2a5c3f943a |
| rev | line source |
|---|---|
| 0 | 1 module dmd.CaseStatement; |
| 2 | |
| 3 import dmd.Statement; | |
| 4 import dmd.Expression; | |
| 5 import dmd.Statement; | |
| 6 import dmd.Scope; | |
| 7 import dmd.Loc; | |
| 8 import dmd.IRState; | |
| 9 import dmd.InlineScanState; | |
| 10 import dmd.HdrGenState; | |
| 11 import dmd.OutBuffer; | |
| 12 import dmd.InterState; | |
| 13 import dmd.BE; | |
| 14 import dmd.SwitchStatement; | |
| 15 import dmd.WANT; | |
| 16 import dmd.TOK; | |
| 17 import dmd.VarExp; | |
| 18 import dmd.VarDeclaration; | |
| 19 import dmd.Type; | |
| 20 import dmd.TY; | |
| 21 import dmd.IntegerExp; | |
| 22 import dmd.GotoCaseStatement; | |
| 23 | |
| 24 import dmd.backend.block; | |
| 25 import dmd.backend.Blockx; | |
| 26 import dmd.backend.Util; | |
| 27 import dmd.backend.BC; | |
| 28 | |
| 29 class CaseStatement : Statement | |
| 30 { | |
| 31 Expression exp; | |
| 32 Statement statement; | |
| 33 | |
| 34 int index = 0; // which case it is (since we sort this) | |
| 35 block* cblock = null; // back end: label for the block | |
| 36 | |
| 37 this(Loc loc, Expression exp, Statement s) | |
| 38 { | |
| 39 super(loc); | |
| 40 | |
| 41 this.exp = exp; | |
| 42 this.statement = s; | |
| 43 } | |
| 44 | |
| 45 Statement syntaxCopy() | |
| 46 { | |
| 53 | 47 CaseStatement s = new CaseStatement(loc, exp.syntaxCopy(), statement.syntaxCopy()); |
| 48 return s; | |
| 0 | 49 } |
| 50 | |
| 51 Statement semantic(Scope sc) | |
| 52 { | |
| 53 SwitchStatement sw = sc.sw; | |
| 54 | |
| 55 //printf("CaseStatement.semantic() %s\n", toChars()); | |
| 56 exp = exp.semantic(sc); | |
| 57 if (sw) | |
| 58 { | |
| 59 exp = exp.implicitCastTo(sc, sw.condition.type); | |
| 60 exp = exp.optimize(WANTvalue | WANTinterpret); | |
| 61 | |
| 62 /* This is where variables are allowed as case expressions. | |
| 63 */ | |
| 64 if (exp.op == TOKvar) | |
| 65 { VarExp ve = cast(VarExp)exp; | |
| 66 VarDeclaration v = ve.var.isVarDeclaration(); | |
| 67 Type t = exp.type.toBasetype(); | |
| 68 if (v && (t.isintegral() || t.ty == Tclass)) | |
| 69 { | |
| 70 /* Flag that we need to do special code generation | |
| 71 * for this, i.e. generate a sequence of if-then-else | |
| 72 */ | |
| 73 sw.hasVars = 1; | |
| 74 if (sw.isFinal) | |
| 75 error("case variables not allowed in final switch statements"); | |
| 76 goto L1; | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 if (exp.op != TOKstring && exp.op != TOKint64) | |
| 81 { | |
| 82 error("case must be a string or an integral constant, not %s", exp.toChars()); | |
| 83 exp = new IntegerExp(0); | |
| 84 } | |
| 85 | |
| 86 L1: | |
| 87 for (int i = 0; i < sw.cases.dim; i++) | |
| 88 { | |
| 89 CaseStatement cs = cast(CaseStatement)sw.cases.data[i]; | |
| 90 | |
| 91 //printf("comparing '%s' with '%s'\n", exp.toChars(), cs.exp.toChars()); | |
| 92 if (cs.exp.equals(exp)) | |
| 93 { | |
| 94 error("duplicate case %s in switch statement", exp.toChars()); | |
| 95 break; | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 sw.cases.push(cast(void*)this); | |
| 100 | |
| 101 // Resolve any goto case's with no exp to this case statement | |
| 102 for (int i = 0; i < sw.gotoCases.dim; i++) | |
| 103 { | |
| 104 GotoCaseStatement gcs = cast(GotoCaseStatement)sw.gotoCases.data[i]; | |
| 105 | |
| 106 if (!gcs.exp) | |
| 107 { | |
| 108 gcs.cs = this; | |
| 109 sw.gotoCases.remove(i); // remove from array | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 if (sc.sw.tf !is sc.tf) | |
| 114 error("switch and case are in different finally blocks"); | |
| 115 } | |
| 116 else | |
| 117 error("case not in switch statement"); | |
| 118 statement = statement.semantic(sc); | |
| 119 return this; | |
| 120 } | |
| 121 | |
|
68
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
parents:
63
diff
changeset
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122 int opCmp(Object obj) |
| 0 | 123 { |
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68
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
parents:
63
diff
changeset
|
124 // Sort cases so we can do an efficient lookup |
|
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
parents:
63
diff
changeset
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125 CaseStatement cs2 = cast(CaseStatement)obj; |
|
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
parents:
63
diff
changeset
|
126 |
|
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
parents:
63
diff
changeset
|
127 return exp.opCmp(cs2.exp); |
| 0 | 128 } |
| 129 | |
| 130 bool usesEH() | |
| 131 { | |
| 132 assert(false); | |
| 133 } | |
| 134 | |
| 135 BE blockExit() | |
| 136 { | |
| 137 return statement.blockExit(); | |
| 138 } | |
| 139 | |
| 140 bool comeFrom() | |
| 141 { | |
| 142 return true; | |
| 143 } | |
| 144 | |
| 63 | 145 Expression interpret(InterState istate) |
| 0 | 146 { |
| 147 assert(false); | |
| 148 } | |
| 149 | |
| 150 void toCBuffer(OutBuffer buf, HdrGenState* hgs) | |
| 151 { | |
| 152 assert(false); | |
| 153 } | |
| 154 | |
| 155 Statement inlineScan(InlineScanState* iss) | |
| 156 { | |
| 157 //printf("CaseStatement.inlineScan()\n"); | |
| 158 exp = exp.inlineScan(iss); | |
| 159 if (statement) | |
| 160 statement = statement.inlineScan(iss); | |
| 161 return this; | |
| 162 } | |
| 163 | |
| 164 void toIR(IRState *irs) | |
| 165 { | |
| 166 Blockx* blx = irs.blx; | |
| 167 block* bcase = blx.curblock; | |
| 168 if (!cblock) | |
| 169 cblock = block_calloc(blx); | |
| 170 block_next(blx,BCgoto,cblock); | |
| 171 block* bsw = irs.getSwitchBlock(); | |
| 172 if (bsw.BC == BCswitch) | |
| 173 list_append(&bsw.Bsucc,cblock); // second entry in pair | |
| 174 list_append(&bcase.Bsucc,cblock); | |
| 175 if (blx.tryblock != bsw.Btry) | |
| 176 error("case cannot be in different try block level from switch"); | |
| 177 incUsage(irs, loc); | |
| 178 if (statement) | |
| 179 statement.toIR(irs); | |
| 180 } | |
| 181 } |