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comparison dmd/OnScopeStatement.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 4ae0d790a452
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-1:000000000000 0:10317f0c89a5
1 module dmd.OnScopeStatement;
2
3 import dmd.Statement;
4 import dmd.OutBuffer;
5 import dmd.HdrGenState;
6 import dmd.Scope;
7 import dmd.IRState;
8 import dmd.TOK;
9 import dmd.Loc;
10 import dmd.BE;
11 import dmd.Identifier;
12 import dmd.ExpInitializer;
13 import dmd.IntegerExp;
14 import dmd.VarDeclaration;
15 import dmd.Type;
16 import dmd.AssignExp;
17 import dmd.VarExp;
18 import dmd.NotExp;
19 import dmd.IfStatement;
20 import dmd.DeclarationStatement;
21 import dmd.ExpStatement;
22 import dmd.Expression;
23 import dmd.Lexer;
24
25 class OnScopeStatement : Statement
26 {
27 TOK tok;
28 Statement statement;
29
30 this(Loc loc, TOK tok, Statement statement)
31 {
32 super(loc);
33
34 this.tok = tok;
35 this.statement = statement;
36 }
37
38 Statement syntaxCopy()
39 {
40 assert(false);
41 }
42
43 BE blockExit()
44 {
45 // At this point, this statement is just an empty placeholder
46 return BE.BEfallthru;
47 }
48
49 void toCBuffer(OutBuffer buf, HdrGenState* hgs)
50 {
51 assert(false);
52 }
53
54 Statement semantic(Scope sc)
55 {
56 /* semantic is called on results of scopeCode() */
57 return this;
58 }
59
60 bool usesEH()
61 {
62 assert(false);
63 }
64
65 void scopeCode(Scope sc, Statement* sentry, Statement* sexception, Statement* sfinally)
66 {
67 //printf("OnScopeStatement::scopeCode()\n");
68 //print();
69 *sentry = null;
70 *sexception = null;
71 *sfinally = null;
72 switch (tok)
73 {
74 case TOKon_scope_exit:
75 *sfinally = statement;
76 break;
77
78 case TOKon_scope_failure:
79 *sexception = statement;
80 break;
81
82 case TOKon_scope_success:
83 {
84 /* Create:
85 * sentry: int x = 0;
86 * sexception: x = 1;
87 * sfinally: if (!x) statement;
88 */
89 Identifier id = Lexer.uniqueId("__os");
90
91 ExpInitializer ie = new ExpInitializer(loc, new IntegerExp(0));
92 VarDeclaration v = new VarDeclaration(loc, Type.tint32, id, ie);
93 *sentry = new DeclarationStatement(loc, v);
94
95 Expression e = new IntegerExp(1);
96 e = new AssignExp(Loc(0), new VarExp(Loc(0), v), e);
97 *sexception = new ExpStatement(Loc(0), e);
98
99 e = new VarExp(Loc(0), v);
100 e = new NotExp(Loc(0), e);
101 *sfinally = new IfStatement(Loc(0), null, e, statement, null);
102
103 break;
104 }
105
106 default:
107 assert(0);
108 }
109 }
110
111 void toIR(IRState* irs)
112 {
113 }
114 }