Use r8/d8 optimized profile for dexpreopt
Currently, dexpreopt supports profile guided optimization. This does not
work well with r8/d8 optimization, since the checked-in profile will not
match the dex signatures after r8/d8 has optimized the dex code.
This CL introduces a new property `dex_preopt.enable_profile_rewrting`.
If set, the checked-in profile will passed as `input` to r8 via
`--art-profile <input> <output>`. The <output> from the previous command
will be used as the profile for dexpreopt.
Test: m nothing --no-skip-soong-tests
Test: m CredentialManager with https://ag.corp.google.com/27448930
and obfuscation turned on
Test: nm -U symbol.odex # contains obfuscated methods
Bug: 335418838
Change-Id: I53beed9ed76f013262f1c503de0f2b74997c2a7f
diff --git a/java/base.go b/java/base.go
index b9e236c..056dbd5 100644
--- a/java/base.go
+++ b/java/base.go
@@ -1650,11 +1650,23 @@
classesJar: implementationAndResourcesJar,
jarName: jarName,
}
- dexOutputFile = j.dexer.compileDex(ctx, params)
+ if j.EnableProfileRewriting() {
+ profile := j.GetProfile()
+ if profile == "" || !j.GetProfileGuided() {
+ ctx.PropertyErrorf("enable_profile_rewriting", "Profile and Profile_guided must be set when enable_profile_rewriting is true")
+ }
+ params.artProfileInput = &profile
+ }
+ dexOutputFile, dexArtProfileOutput := j.dexer.compileDex(ctx, params)
if ctx.Failed() {
return
}
+ // If r8/d8 provides a profile that matches the optimized dex, use that for dexpreopt.
+ if dexArtProfileOutput != nil {
+ j.dexpreopter.SetRewrittenProfile(*dexArtProfileOutput)
+ }
+
// merge dex jar with resources if necessary
if j.resourceJar != nil {
jars := android.Paths{dexOutputFile, j.resourceJar}