Mercurial > projects > ddmd
annotate dmd/SymOffExp.d @ 130:60bb0fe4563e
dmdfe 2.037 first main iteration
| author | Eldar Insafutdinov <e.insafutdinov@gmail.com> |
|---|---|
| date | Thu, 09 Sep 2010 22:51:44 +0100 |
| parents | 010eb8f0e18d |
| children | af1bebfd96a4 |
| rev | line source |
|---|---|
| 72 | 1 module dmd.SymOffExp; |
| 2 | |
| 114 | 3 import dmd.common; |
| 72 | 4 import dmd.Expression; |
| 5 import dmd.Declaration; | |
| 6 import dmd.MATCH; | |
| 7 import dmd.Type; | |
| 8 import dmd.OutBuffer; | |
| 9 import dmd.Loc; | |
| 10 import dmd.Scope; | |
| 11 import dmd.InlineDoState; | |
| 12 import dmd.HdrGenState; | |
| 13 import dmd.backend.dt_t; | |
| 0 | 14 import dmd.SymbolExp; |
| 15 import dmd.VarDeclaration; | |
| 16 import dmd.DelegateExp; | |
| 17 import dmd.ThisExp; | |
| 18 import dmd.FuncDeclaration; | |
| 19 import dmd.IntegerExp; | |
| 20 import dmd.ErrorExp; | |
| 72 | 21 import dmd.TY; |
| 0 | 22 import dmd.TOK; |
| 23 | |
| 24 import dmd.backend.Symbol; | |
| 25 import dmd.backend.Util; | |
| 26 import dmd.backend.TYM; | |
| 72 | 27 |
| 0 | 28 class SymOffExp : SymbolExp |
| 29 { | |
| 30 uint offset; | |
| 31 | |
| 73 | 32 this(Loc loc, Declaration var, uint offset, bool hasOverloads = false) |
| 0 | 33 { |
| 34 super(loc, TOK.TOKsymoff, SymOffExp.sizeof, var, hasOverloads); | |
| 35 | |
| 36 this.offset = offset; | |
| 37 VarDeclaration v = var.isVarDeclaration(); | |
| 38 if (v && v.needThis()) | |
| 39 error("need 'this' for address of %s", v.toChars()); | |
| 40 } | |
| 41 | |
| 72 | 42 override Expression semantic(Scope sc) |
| 0 | 43 { |
| 44 version(LOGSEMANTIC) { | |
| 45 printf("SymOffExp::semantic('%s')\n", toChars()); | |
| 46 } | |
| 47 //var.semantic(sc); | |
| 48 if (!type) | |
| 49 type = var.type.pointerTo(); | |
| 50 VarDeclaration v = var.isVarDeclaration(); | |
| 51 if (v) | |
| 52 v.checkNestedReference(sc, loc); | |
| 53 return this; | |
| 54 } | |
| 55 | |
| 72 | 56 override void checkEscape() |
| 0 | 57 { |
| 58 VarDeclaration v = var.isVarDeclaration(); | |
| 59 if (v) | |
| 60 { | |
| 61 if (!v.isDataseg()) | |
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dmdfe 2.037 first main iteration
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62 { /* BUG: This should be allowed: |
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63 * void foo() |
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64 * { int a; |
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65 * int* bar() { return &a; } |
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66 * } |
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67 */ |
| 0 | 68 error("escaping reference to local variable %s", v.toChars()); |
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69 } |
| 0 | 70 } |
| 71 } | |
| 72 | |
| 72 | 73 override void toCBuffer(OutBuffer buf, HdrGenState* hgs) |
| 0 | 74 { |
| 75 assert(false); | |
| 76 } | |
| 77 | |
| 72 | 78 override int isConst() |
| 0 | 79 { |
| 80 return 2; | |
| 81 } | |
| 82 | |
| 72 | 83 override bool isBool(bool result) |
| 0 | 84 { |
| 129 | 85 return result; |
| 0 | 86 } |
| 87 | |
| 72 | 88 override Expression doInline(InlineDoState ids) |
| 0 | 89 { |
| 90 int i; | |
| 91 | |
| 92 //printf("SymOffExp.doInline(%s)\n", toChars()); | |
| 93 for (i = 0; i < ids.from.dim; i++) | |
| 94 { | |
| 95 if (var is cast(Declaration)ids.from.data[i]) | |
| 96 { | |
| 97 SymOffExp se = cast(SymOffExp)copy(); | |
| 98 | |
| 99 se.var = cast(Declaration)ids.to.data[i]; | |
| 100 return se; | |
| 101 } | |
| 102 } | |
| 103 return this; | |
| 104 } | |
| 105 | |
| 72 | 106 override MATCH implicitConvTo(Type t) |
| 0 | 107 { |
| 108 static if (false) { | |
| 109 printf("SymOffExp::implicitConvTo(this=%s, type=%s, t=%s)\n", toChars(), type.toChars(), t.toChars()); | |
| 110 } | |
| 111 MATCH result = type.implicitConvTo(t); | |
| 112 //printf("\tresult = %d\n", result); | |
| 113 | |
| 114 if (result == MATCHnomatch) | |
| 115 { | |
| 116 // Look for pointers to functions where the functions are overloaded. | |
| 117 FuncDeclaration f; | |
| 118 | |
| 119 t = t.toBasetype(); | |
| 120 if (type.ty == Tpointer && type.nextOf().ty == Tfunction && | |
| 121 (t.ty == Tpointer || t.ty == Tdelegate) && t.nextOf().ty == Tfunction) | |
| 122 { | |
| 123 f = var.isFuncDeclaration(); | |
| 124 if (f) | |
| 125 { | |
| 126 f = f.overloadExactMatch(t.nextOf()); | |
| 127 if (f) | |
| 128 { | |
| 129 if ((t.ty == Tdelegate && (f.needThis() || f.isNested())) || | |
| 130 (t.ty == Tpointer && !(f.needThis() || f.isNested()))) | |
| 131 { | |
| 132 result = MATCHexact; | |
| 133 } | |
| 134 } | |
| 135 } | |
| 136 } | |
| 137 } | |
| 138 //printf("\tresult = %d\n", result); | |
| 139 return result; | |
| 140 } | |
| 141 | |
| 72 | 142 override Expression castTo(Scope sc, Type t) |
| 0 | 143 { |
| 144 static if (false) { | |
| 145 printf("SymOffExp::castTo(this=%s, type=%s, t=%s)\n", toChars(), type.toChars(), t.toChars()); | |
| 146 } | |
| 73 | 147 if (type == t && !hasOverloads) |
| 0 | 148 return this; |
| 149 | |
| 150 Expression e; | |
| 151 Type tb = t.toBasetype(); | |
| 152 Type typeb = type.toBasetype(); | |
| 153 | |
| 154 if (tb != typeb) | |
| 155 { | |
| 156 // Look for pointers to functions where the functions are overloaded. | |
| 157 FuncDeclaration f; | |
| 158 | |
| 159 if (hasOverloads && | |
| 160 typeb.ty == Tpointer && typeb.nextOf().ty == Tfunction && | |
| 161 (tb.ty == Tpointer || tb.ty == Tdelegate) && tb.nextOf().ty == Tfunction) | |
| 162 { | |
| 163 f = var.isFuncDeclaration(); | |
| 164 if (f) | |
| 165 { | |
| 166 f = f.overloadExactMatch(tb.nextOf()); | |
| 167 if (f) | |
| 168 { | |
| 169 if (tb.ty == Tdelegate) | |
| 170 { | |
| 171 if (f.needThis() && hasThis(sc)) | |
| 172 { | |
| 173 e = new DelegateExp(loc, new ThisExp(loc), f); | |
| 174 e = e.semantic(sc); | |
| 175 } | |
| 176 else if (f.isNested()) | |
| 177 { | |
| 178 e = new DelegateExp(loc, new IntegerExp(0), f); | |
| 179 e = e.semantic(sc); | |
| 180 } | |
| 181 else if (f.needThis()) | |
| 182 { | |
| 183 error("no 'this' to create delegate for %s", f.toChars()); | |
| 184 e = new ErrorExp(); | |
| 185 } | |
| 186 else | |
| 187 { | |
| 188 error("cannot cast from function pointer to delegate"); | |
| 189 e = new ErrorExp(); | |
| 190 } | |
| 191 } | |
| 192 else | |
| 193 { | |
| 194 e = new SymOffExp(loc, f, 0); | |
| 195 e.type = t; | |
| 196 } | |
| 197 version (DMDV2) { | |
| 198 f.tookAddressOf++; | |
| 199 } | |
| 200 return e; | |
| 201 } | |
| 202 } | |
| 203 } | |
| 204 e = Expression.castTo(sc, t); | |
| 205 } | |
| 206 else | |
| 207 { | |
| 208 e = copy(); | |
| 209 e.type = t; | |
| 73 | 210 (cast(SymOffExp)e).hasOverloads = false; |
| 0 | 211 } |
| 212 return e; | |
| 213 } | |
| 214 | |
| 72 | 215 override void scanForNestedRef(Scope sc) |
| 0 | 216 { |
| 72 | 217 //printf("SymOffExp.scanForNestedRef(%s)\n", toChars()); |
| 218 VarDeclaration v = var.isVarDeclaration(); | |
| 219 if (v) | |
| 64 | 220 v.checkNestedReference(sc, Loc(0)); |
| 0 | 221 } |
| 222 | |
| 72 | 223 override dt_t** toDt(dt_t** pdt) |
| 0 | 224 { |
| 225 //printf("SymOffExp.toDt('%s')\n", var.toChars()); | |
| 226 assert(var); | |
| 227 if (!(var.isDataseg() || var.isCodeseg()) || | |
| 228 var.needThis() || | |
| 229 var.isThreadlocal() | |
| 230 ) | |
| 231 { | |
| 232 debug writef("SymOffExp.toDt()\n"); | |
| 233 error("non-constant expression %s", toChars()); | |
| 234 return pdt; | |
| 235 } | |
| 236 | |
| 237 Symbol* s = var.toSymbol(); | |
| 238 return dtxoff(pdt, s, offset, TYnptr); | |
| 239 } | |
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240 |
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241 static if (false) |
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242 { |
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243 override elem* toElem(IRState* irs) |
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244 { |
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245 assert(false); // this function is #if 0'ed out in dmd |
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246 } |
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247 } |
| 0 | 248 } |
| 249 |