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Update ProGuard default shrinking rules #2448

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merged 11 commits into from
Aug 22, 2023
Merged

Update ProGuard default shrinking rules #2448

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7fa9ef5
Update ProGuard default shrinking rules to correctly deal with classe…
sgjesse Jul 26, 2023
e384d4d
Merge branch 'google:main' into fix-proguard-rules
sgjesse Jul 27, 2023
f60e17d
Update test after changing default shrinking rules
sgjesse Jul 27, 2023
eea08d0
Adjust shrinker tests
Marcono1234 Aug 5, 2023
4c40a91
Merge pull request #1 from Marcono1234/marcono1234/fix-proguard-rules…
sgjesse Aug 7, 2023
c34126b
Update rules
sgjesse Aug 10, 2023
af98d32
Merge branch 'main' into fix-proguard-rules
sgjesse Aug 10, 2023
ac6e590
Addressed review comments
sgjesse Aug 15, 2023
8d14f1a
Addressed more review comments
sgjesse Aug 21, 2023
743d529
Addressed more review comments
sgjesse Aug 21, 2023
3468700
Merge branch 'main' into fix-proguard-rules
sgjesse Aug 21, 2023
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2 changes: 1 addition & 1 deletion gson/src/main/resources/META-INF/proguard/gson.pro
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,6 @@
# See also https://github.com/google/gson/pull/2420#discussion_r1241813541 for a more detailed explanation
-if class *
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I think this if class *, -classeswithmembers... class <1> doesn't do anything relative to -classeswithmembers... class * , after reading some of the follow-up threads on that change.

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@Marcono1234 Marcono1234 Jul 29, 2023 •
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At least for R8 it does seem to make a difference: -keepclasseswithmembers ... class * always keeps the class, even if it isn't used. Whereas -if class * ... -keepclasseswithmembers ... class <1> only keeps the class if it is actually used.

Unfortunately this is not covered by the tests yet; have created #2455 to add a test for this.

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Thanks also for the other points you raised, but unless sgjesse wants to address them here as well could you please create a separate GitHub issue or pull request? Otherwise the discussion on this pull request here might drift too far away from the original topic.

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Changed the rules to be two -if rules

  1. Keep all @SerializedName fields for classes which are present after shrinking
  2. If a class with a @SerializedName field is present keep its no-args constructor

-keepclasseswithmembers,allowobfuscation,allowoptimization class <1> {
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Why did you remove allowoptimization?

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Having allowoptimization can allow R8 to propagate field values, so if you have an explicit construction of a serialized class always setting a field to a specific value, then that single value can become the default value for the created instances instead of 0/null.

<init>();
<init>(...);
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Please adjust the comment in lines 62 and 63 (GitHub does not let me comment there); for example reword it to:

# If a class is used in some way by the application and has fields annotated with @SerializedName,
# keep those fields and the constructors of the class
# For convenience this also matches classes without no-args constructor, in which case Gson uses JDK Unsafe

@com.google.gson.annotations.SerializedName <fields>;
}