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1 package gnu.expr;
2 import gnu.bytecode.*;
3 import gnu.mapping.OutPort;
4
5
7
8 public class CatchClause extends ScopeExp
9 {
10 Expression body;
11 CatchClause next;
12
13 public CatchClause (Object  name, ClassType type)
14 {
15 super ();
16 addDeclaration (name, type);
17 }
18
19
20 public CatchClause (LambdaExp lexp)
21 {
22 Declaration decl = lexp.firstDecl();
23 lexp.remove(null, decl);
24 add(decl);
25 body = lexp.body;
26 }
27
28 public final CatchClause getNext() { return next; }
29 public final void setNext (CatchClause next) { this.next = next; }
30
31 public final Expression getBody() { return body; }
32 public final void setBody(Expression body) { this.body = body; }
33
34 protected boolean mustCompile () { return true; }
35
36 public void compile (Compilation comp, Target target)
37 {
38 gnu.bytecode.CodeAttr code = comp.getCode();
39 Declaration catchDecl = firstDecl();
40 Variable catchVar = catchDecl.allocateVariable(code);
41 code.enterScope(getVarScope());
42 code.emitCatchStart(catchVar);
43 body.compileWithPosition(comp, target);
44 code.emitCatchEnd();
45 code.popScope ();
46 }
47
48 protected void walkChildren(ExpWalker walker)
49 {
50 body = walker.walk(body);
51 }
52
53 public void print (OutPort out)
54 {
55 out.writeSpaceLinear();
56 out.startLogicalBlock("(Catch", ")", 2);
57 out.writeSpaceFill();
58 decls.printInfo(out);
59 out.writeSpaceLinear();
60 body.print(out);
61 out.endLogicalBlock(")");
62 }
63 }
64 |
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