commit | 40b5cb39209a6f55949276fb1ce13d0c81cdc434 | [log] [tgz] |
---|---|---|
author | Yigit Boyar <yboyar@google.com> | Mon Jan 25 22:47:35 2021 -0800 |
committer | Yigit Boyar <yboyar@google.com> | Thu Jan 28 06:03:22 2021 +0000 |
tree | 8804c2de7d4a592d14657461eb747d8e0f820d62 | |
parent | b1cde6303de9549daa9487522017d389535c13ef [diff] |
Read order of fields from the .class file This CL fixes a bug in KSP where the order of fields returned in a KSClassDeclaration does not necessarily match the order they were declared in the class. It only impacts compiled kotlin classes because Kotlin compiler orders field names when serializing the metadata. https://github.com/google/ksp/issues/250 This particularly hurts Room as we generate the table structure based on this order. Even though Room is clever enough to consider the schema the same, the effects are still visible in both schema files and generated sql database. This CL is a port of a possible implementation in KSP: https://github.com/google/ksp/pull/260 Unfortunately, merging that CL would mean KSP doing a lot more work for each class. The plan there is to first fix it in the kotlin compiler if possible and if not, add an API to get sorted fields (to avoid the cost when not necessary). Meanwhile, this CL is a band aid solution in Room so that developers won't have unexpected schema file changes when they move to KSP from KAPT. As this solution is best effort, it doesn't fail compilation if it fails to read fields. I've added a strict mode to XProcessing so that we can run it in tests with a requirement to always find the order but on developer's machine, it won't require this. This strict mode can be turned on via a system property, which we can use to collect more bug information when it doesn't work. Fixes: 177471948 Test: OrderOfFieldsTest Change-Id: If0cf346a7f92dbbf2094e0076ea9ed02de4e32fc
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