Clear as much of cc.Module as possible after GenerateBuildActions

Reduce peak memory usage by adding a CleanupAfterBuildActions method
that is called at the end GenerateBuidlActions, nad use it to clear as
much of cc.Module as possible.

This is a temporary measure, eventually the entire module should be
released by blueprint once all interactions are performed through
providers.

Test: all soong tests pass
Change-Id: Idc3390ae4506ff2eef3231691e1de7446067961a

1 files changed, 12 insertions, 0 deletions

diff --git a/android/module.go b/android/module.go
index ecd0f239c..c0abfd0a3 100644
--- a/android/module.go
+++ b/android/module.go
@@ -45,6 +45,14 @@ type Module interface {
 	// For more information, see Module.GenerateBuildActions within Blueprint's module_ctx.go
 	GenerateAndroidBuildActions(ModuleContext)
 
+	// CleanupAfterBuildActions is called after ModuleBase.GenerateBuildActions is finished.
+	// If all interactions with this module are handled via providers instead of direct access
+	// to the module then it can free memory attached to the module.
+	// This is a temporary measure to reduce memory usage, eventually blueprint's reference
+	// to the Module should be dropped after GenerateAndroidBuildActions once all accesses
+	// can be done through providers.
+	CleanupAfterBuildActions()
+
 	// Add dependencies to the components of a module, i.e. modules that are created
 	// by the module and which are considered to be part of the creating module.
 	//
@@ -2387,8 +2395,12 @@ func (m *ModuleBase) GenerateBuildActions(blueprintCtx blueprint.ModuleContext)
 			})
 		}
 	}
+
+	m.module.CleanupAfterBuildActions()
 }
 
+func (m *ModuleBase) CleanupAfterBuildActions() {}
+
 func SetJarJarPrefixHandler(handler func(ModuleContext)) {
 	if jarJarPrefixHandler != nil {
 		panic("jarJarPrefixHandler already set")