Is there a way to diff two classfiles and "blame" it on a line number given line information is aviable?

[laeubi]

Look at this comparator issue:

• Comparator Errors in I20240201-1800 eclipse-platform/eclipse.platform.releng.aggregator#1764

You see that currently the output is rather informal

org/eclipse/jdt/core/tests/model/OverflowingCacheTests.class: different

the posted DIFF tool screenshot shows then

and this is finally matched to this PR (a change of a constant value):

• Increase JavaModelCache #1929 #1935

I wonder if there is anything in JDT that can be used to perform such task in an automated way and maybe even give the line number information from the class file so this would result in an output like this:

org/eclipse/jdt/core/tests/model/OverflowingCacheTests.class: different
--> probably by org/eclipse/jdt/core/tests/model/OverflowingCacheTests.java:311

(that's where the constant is used)

eclipse.jdt.core/org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model/OverflowingCacheTests.java

Line 311 in 6fecdc9

int rootSize = JavaModelCache.DEFAULT_ROOT_SIZE * 2;

To clarify: Such analysis must not be perfect, it would be enough to get an rough line estimate from the first diff in both class files.