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comparison dmd/DefaultStatement.d @ 0:10317f0c89a5

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Initial commit
author korDen
date Sat, 24 Oct 2009 08:42:06 +0400
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children a8b50ff7f201
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-1:000000000000 0:10317f0c89a5
1 module dmd.DefaultStatement;
2
3 import dmd.Statement;
4 import dmd.Loc;
5 import dmd.Scope;
6 import dmd.Expression;
7 import dmd.InterState;
8 import dmd.OutBuffer;
9 import dmd.HdrGenState;
10 import dmd.InlineScanState;
11 import dmd.IRState;
12 import dmd.BE;
13
14 import dmd.backend.Util;
15 import dmd.backend.OPER;
16 import dmd.backend.Blockx;
17 import dmd.backend.block;
18 import dmd.backend.BC;
19
20 class DefaultStatement : Statement
21 {
22 Statement statement;
23 version (IN_GCC) {
24 block* cblock = null; // back end: label for the block
25 }
26
27 this(Loc loc, Statement s)
28 {
29 super(loc);
30 this.statement = s;
31 }
32
33 Statement syntaxCopy()
34 {
35 assert(false);
36 }
37
38 Statement semantic(Scope sc)
39 {
40 //printf("DefaultStatement.semantic()\n");
41 if (sc.sw)
42 {
43 if (sc.sw.sdefault)
44 {
45 error("switch statement already has a default");
46 }
47 sc.sw.sdefault = this;
48
49 if (sc.sw.tf !is sc.tf)
50 error("switch and default are in different finally blocks");
51
52 if (sc.sw.isFinal)
53 error("default statement not allowed in final switch statement");
54 }
55 else
56 error("default not in switch statement");
57 statement = statement.semantic(sc);
58 return this;
59 }
60
61 bool usesEH()
62 {
63 assert(false);
64 }
65
66 BE blockExit()
67 {
68 return statement.blockExit();
69 }
70
71 bool comeFrom()
72 {
73 return true;
74 }
75
76 Expression interpret(InterState* istate)
77 {
78 assert(false);
79 }
80
81 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
82 {
83 assert(false);
84 }
85
86 Statement inlineScan(InlineScanState* iss)
87 {
88 if (statement)
89 statement = statement.inlineScan(iss);
90 return this;
91 }
92
93 void toIR(IRState* irs)
94 {
95 Blockx* blx = irs.blx;
96 block* bcase = blx.curblock;
97 block* bdefault = irs.getDefaultBlock();
98 block_next(blx,BCgoto,bdefault);
99 list_append(&bcase.Bsucc,blx.curblock);
100 if (blx.tryblock != irs.getSwitchBlock().Btry)
101 error("default cannot be in different try block level from switch");
102 incUsage(irs, loc);
103 if (statement)
104 statement.toIR(irs);
105 }
106 }