Mercurial > projects > ddmd
annotate dmd/CaseStatement.d @ 187:b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
| author | Abscissa |
|---|---|
| date | Tue, 07 Jun 2011 23:37:34 -0400 |
| parents | e3afd1303184 |
| children |
| 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 | |
|
187
b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
Abscissa
parents:
178
diff
changeset
|
30 import dmd.DDMDExtensions; |
|
b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
Abscissa
parents:
178
diff
changeset
|
31 |
| 0 | 32 class CaseStatement : Statement |
| 33 { | |
|
187
b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
Abscissa
parents:
178
diff
changeset
|
34 mixin insertMemberExtension!(typeof(this)); |
|
b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
Abscissa
parents:
178
diff
changeset
|
35 |
| 0 | 36 Expression exp; |
| 37 Statement statement; | |
| 38 | |
| 39 int index = 0; // which case it is (since we sort this) | |
| 40 block* cblock = null; // back end: label for the block | |
| 41 | |
| 42 this(Loc loc, Expression exp, Statement s) | |
| 43 { | |
| 178 | 44 register(); |
| 45 | |
| 0 | 46 super(loc); |
| 47 | |
| 48 this.exp = exp; | |
| 49 this.statement = s; | |
| 50 } | |
| 51 | |
| 72 | 52 override Statement syntaxCopy() |
| 0 | 53 { |
| 53 | 54 CaseStatement s = new CaseStatement(loc, exp.syntaxCopy(), statement.syntaxCopy()); |
| 55 return s; | |
| 0 | 56 } |
| 57 | |
| 72 | 58 override Statement semantic(Scope sc) |
| 0 | 59 { |
| 60 SwitchStatement sw = sc.sw; | |
| 61 | |
| 62 //printf("CaseStatement.semantic() %s\n", toChars()); | |
| 63 exp = exp.semantic(sc); | |
| 64 if (sw) | |
| 65 { | |
| 66 exp = exp.implicitCastTo(sc, sw.condition.type); | |
| 67 exp = exp.optimize(WANTvalue | WANTinterpret); | |
| 68 | |
| 69 /* This is where variables are allowed as case expressions. | |
| 70 */ | |
| 71 if (exp.op == TOKvar) | |
| 72 { VarExp ve = cast(VarExp)exp; | |
| 73 VarDeclaration v = ve.var.isVarDeclaration(); | |
| 74 Type t = exp.type.toBasetype(); | |
| 75 if (v && (t.isintegral() || t.ty == Tclass)) | |
| 76 { | |
| 77 /* Flag that we need to do special code generation | |
| 78 * for this, i.e. generate a sequence of if-then-else | |
| 79 */ | |
| 80 sw.hasVars = 1; | |
| 81 if (sw.isFinal) | |
| 82 error("case variables not allowed in final switch statements"); | |
| 83 goto L1; | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 if (exp.op != TOKstring && exp.op != TOKint64) | |
| 88 { | |
| 89 error("case must be a string or an integral constant, not %s", exp.toChars()); | |
| 90 exp = new IntegerExp(0); | |
| 91 } | |
| 92 | |
| 93 L1: | |
| 94 for (int i = 0; i < sw.cases.dim; i++) | |
| 95 { | |
| 96 CaseStatement cs = cast(CaseStatement)sw.cases.data[i]; | |
| 97 | |
| 98 //printf("comparing '%s' with '%s'\n", exp.toChars(), cs.exp.toChars()); | |
| 99 if (cs.exp.equals(exp)) | |
| 100 { | |
| 101 error("duplicate case %s in switch statement", exp.toChars()); | |
| 102 break; | |
| 103 } | |
| 104 } | |
| 105 | |
| 106 sw.cases.push(cast(void*)this); | |
| 107 | |
| 108 // Resolve any goto case's with no exp to this case statement | |
| 109 for (int i = 0; i < sw.gotoCases.dim; i++) | |
| 110 { | |
| 111 GotoCaseStatement gcs = cast(GotoCaseStatement)sw.gotoCases.data[i]; | |
| 112 | |
| 113 if (!gcs.exp) | |
| 114 { | |
| 115 gcs.cs = this; | |
| 116 sw.gotoCases.remove(i); // remove from array | |
| 117 } | |
| 118 } | |
| 119 | |
| 120 if (sc.sw.tf !is sc.tf) | |
| 121 error("switch and case are in different finally blocks"); | |
| 122 } | |
| 123 else | |
| 124 error("case not in switch statement"); | |
| 125 statement = statement.semantic(sc); | |
| 126 return this; | |
| 127 } | |
| 128 | |
| 72 | 129 override int opCmp(Object obj) |
| 0 | 130 { |
|
68
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
parents:
63
diff
changeset
|
131 // Sort cases so we can do an efficient lookup |
|
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
parents:
63
diff
changeset
|
132 CaseStatement cs2 = cast(CaseStatement)obj; |
|
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
parents:
63
diff
changeset
|
133 |
|
ee3a9f34dc48
final bits of codegen implementation to compile Phobos
korDen
parents:
63
diff
changeset
|
134 return exp.opCmp(cs2.exp); |
| 0 | 135 } |
| 136 | |
| 72 | 137 override bool usesEH() |
| 0 | 138 { |
| 139 assert(false); | |
| 140 } | |
| 141 | |
| 72 | 142 override BE blockExit() |
| 0 | 143 { |
| 144 return statement.blockExit(); | |
| 145 } | |
| 146 | |
| 72 | 147 override bool comeFrom() |
| 0 | 148 { |
| 149 return true; | |
| 150 } | |
| 151 | |
| 72 | 152 override Expression interpret(InterState istate) |
| 0 | 153 { |
| 163 | 154 version (LOG) { |
| 155 printf("CaseStatement.interpret(%s) this = %p\n", exp.toChars(), this); | |
| 156 } | |
| 157 if (istate.start is this) | |
| 158 istate.start = null; | |
| 159 if (statement) | |
| 160 return statement.interpret(istate); | |
| 161 else | |
| 162 return null; | |
| 0 | 163 } |
| 164 | |
| 72 | 165 override void toCBuffer(OutBuffer buf, HdrGenState* hgs) |
| 0 | 166 { |
| 174 | 167 buf.writestring("case "); |
| 168 exp.toCBuffer(buf, hgs); | |
| 169 buf.writebyte(':'); | |
| 170 buf.writenl(); | |
| 171 statement.toCBuffer(buf, hgs); | |
| 0 | 172 } |
| 173 | |
| 72 | 174 override Statement inlineScan(InlineScanState* iss) |
| 0 | 175 { |
| 176 //printf("CaseStatement.inlineScan()\n"); | |
| 177 exp = exp.inlineScan(iss); | |
| 178 if (statement) | |
| 179 statement = statement.inlineScan(iss); | |
| 180 return this; | |
| 181 } | |
| 182 | |
| 72 | 183 override void toIR(IRState *irs) |
| 0 | 184 { |
| 185 Blockx* blx = irs.blx; | |
| 186 block* bcase = blx.curblock; | |
| 187 if (!cblock) | |
| 188 cblock = block_calloc(blx); | |
| 189 block_next(blx,BCgoto,cblock); | |
| 190 block* bsw = irs.getSwitchBlock(); | |
| 191 if (bsw.BC == BCswitch) | |
| 192 list_append(&bsw.Bsucc,cblock); // second entry in pair | |
| 193 list_append(&bcase.Bsucc,cblock); | |
| 194 if (blx.tryblock != bsw.Btry) | |
| 195 error("case cannot be in different try block level from switch"); | |
| 196 incUsage(irs, loc); | |
| 197 if (statement) | |
| 198 statement.toIR(irs); | |
| 199 } | |
| 72 | 200 } |