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JGS (9/7/01 9:42:36 AM) JDI does not appear to support this, so we'd need to fake it on the client. JGS (9/10/01 11:28:58 AM) What happens when we step into a synthetic method? Does the debugger keep performing 'step intos' until we get to a non-synthetic method? Similar question for 'step return', does the debugger keep performing 'step returns' until no longer in a synthetic method? And also step overs, since you could step over out of a method and back into a synthetic one. JGS (9/13/01 2:44:21 PM) Will investigate how regular step filtering handles the following situation: - Method 'a' in class 'A' calls method 'b' in class 'B' - Method 'b' in class 'B' calls method 'c' in class 'C' - Set breakpoint in 'a' on call to 'b' - Set step filters such that only B is filtered - When suspended at breakpoint, step in, what happens? - 2 choices: (1) Acts like a step over, or (2) we suspend in 'c' Results of this experiment should guide us on how to handle filtering synthetic methods. If answer is (1), this is relatively straightforward to implement in client. If it's (2), this is much more involved. JGS (9/13/01 3:45:45 PM) It appears the answer is (2). DW (9/24/2001 3:59:05 PM) I think the logic is something like this: * User does a stepX (over/into/return) * If the resulting suspend location is a synthetic method, and the filter is on do another stepX This will get the desired behavior of moving from A to B, and evenutally stepping into C. I also manually insured that stepping "into" will eventually return to B (i.e. if there is nothing to "step into", the result is a "step over"). JGS (10/2/01 11:18:12 AM) Also want to add ability to filter stepping into static initializers. This should be similar to filtering synthetic methods. JGS (10/2/01 11:26:08 AM) Maybe also consider option to filter constructors. JGS (10/2/01 1:10:36 PM) Wait until after refactoring of step handling in JDIThread.
JDI supplies the "isSynthetic()" method we can use to implement this feature, however, it appears that none of: [IBM, Sun 1.2.2, Sun 1.3.0, Sun 1.4beta, J9] VMs support this feature, as indicated by their return values for the "canGetSyntheticAttribute()" call on VirtualMachine. Can implement this feature for very little extra work on top of implementing filtering static initializers (which all VMs support), then just wait for VM support.
Implemented infrastructure to handle synthetic method filtering, very similar to the infrastructure for static initializer filtering, but synthetic filtering cannot be tested, since there doesn't seem to be a VM that supports it at present.
Fixed.
Verified.
