Source Code Cross Referenced for IncrementProc.java in  » Scripting » Nice » nice » tools » code » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » Nice » nice.tools.code 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /**************************************************************************/
02:        /*                             N I C E                                    */
03:        /*        A simple imperative object-oriented research language           */
04:        /*                   (c)  Daniel Bonniot 1999                             */
05:        /*                                                                        */
06:        /*  This program is free software; you can redistribute it and/or modify  */
07:        /*  it under the terms of the GNU General Public License as published by  */
08:        /*  the Free Software Foundation; either version 2 of the License, or     */
09:        /*  (at your option) any later version.                                   */
10:        /*                                                                        */
11:        /**************************************************************************/package nice.tools.code;
12:
13:        import gnu.expr.*;
14:        import gnu.bytecode.*;
15:
16:        /**
17:         Increment the value of an object field. 
18:         Returns either the old or the new value.
19:        
20:         @author Daniel Bonniot
21:         */
22:
23:        public class IncrementProc extends gnu.mapping.Procedure1 implements 
24:                Inlineable {
25:            /**
26:               @param field the field to increment or decrement.
27:               @param increment true to increment, false to decrement
28:               @param returnOld if true, return value before modification,
29:               otherwise value after modification
30:             */
31:            public IncrementProc(Declaration field, boolean returnOld,
32:                    boolean increment) {
33:                this .fieldDecl = field;
34:                this .returnOld = returnOld;
35:                this .increment = increment;
36:            }
37:
38:            private Declaration fieldDecl;
39:            private boolean increment;
40:            private boolean returnOld;
41:
42:            public void compile(ApplyExp exp, Compilation comp, Target target) {
43:                Field field = this .fieldDecl.field;
44:                CodeAttr code = comp.getCode();
45:                ClassType ctype = field.getDeclaringClass();
46:                Expression[] args = exp.getArgs();
47:
48:                // tells whether we want the value to be returned
49:                boolean ignore = target instanceof  IgnoreTarget;
50:
51:                boolean isLong = field.getType().getSize() > 4;
52:                PrimType type = isLong ? Type.long_type : Type.int_type;
53:
54:                args[0].compile(comp, ctype);
55:                code.emitDup(ctype);
56:                code.emitGetField(field);
57:
58:                if (!ignore && returnOld)
59:                    // Place a copy of the old value before the two operands
60:                    code.emitDup(isLong ? 2 : 1, 1);
61:
62:                if (isLong)
63:                    code.emitPushLong(1);
64:                else
65:                    code.emitPushInt(1);
66:                if (increment)
67:                    code.emitAdd(type);
68:                else
69:                    code.emitSub(type);
70:
71:                if (!ignore && !returnOld)
72:                    // Place a copy of the new value before the two operands
73:                    code.emitDup(isLong ? 2 : 1, 1);
74:
75:                code.emitPutField(field);
76:
77:                if (!ignore)
78:                    target.compileFromStack(comp, field.getType());
79:            }
80:
81:            public gnu.bytecode.Type getReturnType(Expression[] args) {
82:                return fieldDecl.getType();
83:            }
84:
85:            public Object apply1(Object arg1) {
86:                throw new RuntimeException("not implemented");
87:            }
88:        }
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