Re: [aspectj-dev] Incremental Compile Time Weaving

[Andrew Clement <andrew.clement@xxxxxxxxx>]

Hi Justin,

AJDT (the eclipse support for AspectJ) drives AspectJ for incremental compilation.  There is a complex state object that is produced by the first ‘full build’ (so you always get a first full build when you open the IDE) but after that the state object is used to do minimal builds for any changes you make.(the state object could be persisted on disk but that code hasn’t been written…).

It is similar to the incremental compilation approach taken by Eclipse JDT but obviously aspects make it a little more complicated. You can see in https://github.com/eclipse/org.aspectj/blob/d5dada81e503e257d20e2aa829716fb5c3934072/org.aspectj.ajdt.core/src/main/java/org/aspectj/ajdt/internal/core/builder/IncrementalStateManager.java that there are (full) batchBuild() method and an incrementalBuild() method. 

Digging through AJDT to explore how that gets used is perhaps challenging but there are https://github.com/eclipse/org.aspectj/blob/591afb3a599dc2b3dd5811c6c7e74e7e5f3c5c01/tests/src/test/java/org/aspectj/systemtest/incremental/tools/IncrementalCompilationTests.java tests for incremental compilation and the harness they use - https://github.com/eclipse/org.aspectj/blob/884ced970ee8d04bfb89a53ec1a40fcb848db2b6/tests/src/test/java/org/aspectj/systemtest/incremental/tools/AbstractMultiProjectIncrementalAjdeInteractionTestbed.java can perhaps give you hints about how the compiler is initially setup then subsequent incremental build requests are made. The tests are building a project, then changing some file within it, then driving an incremental build and checking the expected things (and only those) are built/woven.  I don’t think there are up to date docs for the whole implementation unfortunately. 

Cheers,

Andy

On Sep 8, 2020, at 11:44 AM, Justin Tullgren <jtullgren@xxxxxxxxxxxxxxx> wrote:

Hi,

 

I am investigating if the AJ compiler supports incremental compilations. Is it possible to weave byte code for only modified types?  If yes, can anyone please point me to the developer documentation for it?

 

Thank you,

JT

Justin Tullgren
Senior Software Engineer
T 
M 603-512-2826
jtullgren@xxxxxxxxxxxxxxx

 

 

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