Ian Hunter wrote:
Are there convenient ways within BCel to identify points in methods
where
users can safely insert code. My thoughts are that given a method, can I
identify things like all return statements, exception exits from the
method
and possibly System.exit(). I also realise that in the case of <init>
there
is some code which must be first (the new and the call to super()).
There may be other examples which I haven't come across.
Burt Wagner, Senior Software Engineer
Alignment Software, Inc. www.alignmentsoftware.com
(Formerly NPULSE Software, Inc. www.npulse.com)
100 Superior Plaza Way, Suite 200
Superior, Colorado 80027
Work: (303) 642-4457 WFax: (303) 642-4002
Cell: (303) 589-3095
Responds:
The following code snip might give you some ideas.
public static final String PATTERNS =
"`RETURN'|`ARETURN'|`DRETURN'|`FRETURN'|`IRETURN'|`LRETURN'";
InstructionHandle instructionHandle = instructionList.getStart();
FindPattern findPattern = new FindPattern(instructionList);
do {
instructionHandle = findPattern.search(PATTERNS, instructionHandle);
if (instructionHandle != null) {
Instruction instruction = instructionHandle.getInstruction();
switch (instruction.getOpcode()) {
case Constants.IRETURN: // 172
break;
case Constants.LRETURN: // 173
break;
case Constants.FRETURN: // 174
break;
case Constants.DRETURN: // 175
break;
case Constants.ARETURN: // 176
break;
case Constants.RETURN: // 177
break;
default: throw new RuntimeException("Bad case in opcode switch");
}
} while (instructionHandle!=null);
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