Add flag for optimized resource shrinking with R8
If the flag is set we will:
- pass --optimized-resource-shrinking to the r8 invocation
- use non final fields for the generated R classes
- not pass the aapt2 generated proguard rules, R8 will do the tracing of xml files
Bug: 325905703
Test: This is simply passing the flag through to R8, this is off by default
Change-Id: Ib2043f3201578c3bcd39c1de9a524fd78f6d795c
diff --git a/java/dex.go b/java/dex.go
index 4474c63..6caaa7f 100644
--- a/java/dex.go
+++ b/java/dex.go
@@ -66,6 +66,12 @@
// If true, optimize for size by removing unused resources. Defaults to false.
Shrink_resources *bool
+ // If true, use optimized resource shrinking in R8, overriding the
+ // Shrink_resources setting. Defaults to false.
+ // Optimized shrinking means that R8 will trace and treeshake resources together with code
+ // and apply additional optimizations. This implies non final fields in the R classes.
+ Optimized_shrink_resources *bool
+
// Flags to pass to proguard.
Proguard_flags []string
@@ -105,6 +111,10 @@
return BoolDefault(d.dexProperties.Optimize.Enabled, d.dexProperties.Optimize.EnabledByDefault)
}
+func (d *DexProperties) resourceShrinkingEnabled() bool {
+ return BoolDefault(d.Optimize.Optimized_shrink_resources, Bool(d.Optimize.Shrink_resources))
+}
+
var d8, d8RE = pctx.MultiCommandRemoteStaticRules("d8",
blueprint.RuleParams{
Command: `rm -rf "$outDir" && mkdir -p "$outDir" && ` +
@@ -351,10 +361,14 @@
r8Flags = append(r8Flags, "-ignorewarnings")
}
+ // resourcesInput is empty when we don't use resource shrinking, if on, pass these to R8
if d.resourcesInput.Valid() {
r8Flags = append(r8Flags, "--resource-input", d.resourcesInput.Path().String())
r8Deps = append(r8Deps, d.resourcesInput.Path())
r8Flags = append(r8Flags, "--resource-output", d.resourcesOutput.Path().String())
+ if Bool(opt.Optimized_shrink_resources) {
+ r8Flags = append(r8Flags, "--optimized-resource-shrinking")
+ }
}
return r8Flags, r8Deps