Have destroy call freePrefetchedLayers

 Bug: 17208461

 There's a potential race condition between HardwareRenderer.destroy()
 being called (which calls destroyCanvasAndSurface()) and the renderer
 being finalized (which is what calls freePrefetchedLayers), during which
 time it's possible we get a TRIM_MEMORY_COMPLETE and destroy the EGL
 context.

 Fix this race condition by moving stopDrawing() and freePrefetchedLayers()
 into destroyCanvasAndSurface() where they should have been in the first
 place.

 Also, if we hit the assertion failure, dump the current state of
 Caches to try and provide more context for the failure.

Change-Id: Ife0ba3562041e8b08e87e3e13640472b3004eed6

10 files changed, 35 insertions, 14 deletions

diff --git a/libs/hwui/Caches.cpp b/libs/hwui/Caches.cpp
index 5689e17..9855f71 100644
--- a/libs/hwui/Caches.cpp
+++ b/libs/hwui/Caches.cpp
@@ -24,6 +24,7 @@
 #include "Properties.h"
 #include "LayerRenderer.h"
 #include "ShadowTessellator.h"
+#include "RenderState.h"
 
 namespace android {
 
@@ -49,7 +50,7 @@ namespace uirenderer {
 ///////////////////////////////////////////////////////////////////////////////
 
 Caches::Caches(): Singleton<Caches>(),
-        mExtensions(Extensions::getInstance()), mInitialized(false) {
+        mExtensions(Extensions::getInstance()), mInitialized(false), mRenderState(NULL) {
     init();
     initFont();
     initConstraints();
@@ -267,8 +268,11 @@ void Caches::dumpMemoryUsage(String8 &log) {
     log.appendFormat("Current memory usage / total memory usage (bytes):\n");
     log.appendFormat("  TextureCache         %8d / %8d\n",
             textureCache.getSize(), textureCache.getMaxSize());
-    log.appendFormat("  LayerCache           %8d / %8d\n",
-            layerCache.getSize(), layerCache.getMaxSize());
+    log.appendFormat("  LayerCache           %8d / %8d (numLayers = %zu)\n",
+            layerCache.getSize(), layerCache.getMaxSize(), layerCache.getCount());
+    log.appendFormat("  Garbage layers       %8zu\n", mLayerGarbage.size());
+    log.appendFormat("  Active layers        %8zu\n",
+            mRenderState ? mRenderState->mActiveLayers.size() : 0);
     log.appendFormat("  RenderBufferCache    %8d / %8d\n",
             renderBufferCache.getSize(), renderBufferCache.getMaxSize());
     log.appendFormat("  GradientCache        %8d / %8d\n",
diff --git a/libs/hwui/Caches.h b/libs/hwui/Caches.h
index 0482430..726b74d 100644
--- a/libs/hwui/Caches.h
+++ b/libs/hwui/Caches.h
@@ -107,6 +107,7 @@ struct CacheLogger {
 ///////////////////////////////////////////////////////////////////////////////
 
 class RenderNode;
+class RenderState;
 
 class ANDROID_API Caches: public Singleton<Caches> {
     Caches();
@@ -132,6 +133,8 @@ public:
      */
     bool initProperties();
 
+    void setRenderState(RenderState* renderState) { mRenderState = renderState; }
+
     /**
      * Flush the cache.
      *
@@ -431,6 +434,8 @@ private:
     GLuint mBoundTextures[REQUIRED_TEXTURE_UNITS_COUNT];
 
     OverdrawColorSet mOverdrawDebugColorSet;
+
+    RenderState* mRenderState;
 }; // class Caches
 
 }; // namespace uirenderer
diff --git a/libs/hwui/LayerCache.cpp b/libs/hwui/LayerCache.cpp
index 13869aa..efa30ac 100644
--- a/libs/hwui/LayerCache.cpp
+++ b/libs/hwui/LayerCache.cpp
@@ -49,6 +49,10 @@ LayerCache::~LayerCache() {
 // Size management
 ///////////////////////////////////////////////////////////////////////////////
 
+size_t LayerCache::getCount() {
+    return mCache.size();
+}
+
 uint32_t LayerCache::getSize() {
     return mSize;
 }
diff --git a/libs/hwui/LayerCache.h b/libs/hwui/LayerCache.h
index 1b0fc2c..6b93e8f 100644
--- a/libs/hwui/LayerCache.h
+++ b/libs/hwui/LayerCache.h
@@ -87,6 +87,8 @@ public:
      */
     uint32_t getSize();
 
+    size_t getCount();
+
     /**
      * Prints out the content of the cache.
      */
diff --git a/libs/hwui/RenderState.cpp b/libs/hwui/RenderState.cpp
index 50b8f39..9948b44 100644
--- a/libs/hwui/RenderState.cpp
+++ b/libs/hwui/RenderState.cpp
@@ -32,10 +32,14 @@ void RenderState::onGLContextCreated() {
     // This is delayed because the first access of Caches makes GL calls
     mCaches = &Caches::getInstance();
     mCaches->init();
+    mCaches->setRenderState(this);
 }
 
 void RenderState::onGLContextDestroyed() {
-    LOG_ALWAYS_FATAL_IF(!mActiveLayers.empty(), "layers have survived gl context destruction");
+    if (CC_UNLIKELY(!mActiveLayers.empty())) {
+        mCaches->dumpMemoryUsage();
+        LOG_ALWAYS_FATAL("layers have survived gl context destruction");
+    }
 }
 
 void RenderState::setViewport(GLsizei width, GLsizei height) {
diff --git a/libs/hwui/RenderState.h b/libs/hwui/RenderState.h
index cd71c73..3915fb5 100644
--- a/libs/hwui/RenderState.h
+++ b/libs/hwui/RenderState.h
@@ -59,6 +59,7 @@ public:
 
 private:
     friend class renderthread::RenderThread;
+    friend class Caches;
 
     void interruptForFunctorInvoke();
     void resumeFromFunctorInvoke();
diff --git a/libs/hwui/renderthread/CanvasContext.cpp b/libs/hwui/renderthread/CanvasContext.cpp
index 0a17e13..967cb6f 100644
--- a/libs/hwui/renderthread/CanvasContext.cpp
+++ b/libs/hwui/renderthread/CanvasContext.cpp
@@ -51,13 +51,14 @@ CanvasContext::CanvasContext(RenderThread& thread, bool translucent,
 }
 
 CanvasContext::~CanvasContext() {
-    destroyCanvasAndSurface();
-    mRenderThread.removeFrameCallback(this);
+    destroy();
     delete mAnimationContext;
-    freePrefetechedLayers();
 }
 
-void CanvasContext::destroyCanvasAndSurface() {
+void CanvasContext::destroy() {
+    stopDrawing();
+    freePrefetechedLayers();
+    destroyHardwareResources();
     if (mCanvas) {
         delete mCanvas;
         mCanvas = 0;
diff --git a/libs/hwui/renderthread/CanvasContext.h b/libs/hwui/renderthread/CanvasContext.h
index 7c27190..5984fd0 100644
--- a/libs/hwui/renderthread/CanvasContext.h
+++ b/libs/hwui/renderthread/CanvasContext.h
@@ -66,7 +66,7 @@ public:
     void processLayerUpdate(DeferredLayerUpdater* layerUpdater);
     void prepareTree(TreeInfo& info);
     void draw();
-    void destroyCanvasAndSurface();
+    void destroy();
 
     // IFrameCallback, Chroreographer-driven frame callback entry point
     virtual void doFrame();
diff --git a/libs/hwui/renderthread/RenderProxy.cpp b/libs/hwui/renderthread/RenderProxy.cpp
index 3d04316..9528874 100644
--- a/libs/hwui/renderthread/RenderProxy.cpp
+++ b/libs/hwui/renderthread/RenderProxy.cpp
@@ -194,13 +194,13 @@ int RenderProxy::syncAndDrawFrame(nsecs_t frameTimeNanos, nsecs_t recordDuration
     return mDrawFrameTask.drawFrame(frameTimeNanos, recordDurationNanos);
 }
 
-CREATE_BRIDGE1(destroyCanvasAndSurface, CanvasContext* context) {
-    args->context->destroyCanvasAndSurface();
+CREATE_BRIDGE1(destroy, CanvasContext* context) {
+    args->context->destroy();
     return NULL;
 }
 
-void RenderProxy::destroyCanvasAndSurface() {
-    SETUP_TASK(destroyCanvasAndSurface);
+void RenderProxy::destroy() {
+    SETUP_TASK(destroy);
     args->context = mContext;
     // destroyCanvasAndSurface() needs a fence as when it returns the
     // underlying BufferQueue is going to be released from under
diff --git a/libs/hwui/renderthread/RenderProxy.h b/libs/hwui/renderthread/RenderProxy.h
index 9e6bcf5..8b8d99c 100644
--- a/libs/hwui/renderthread/RenderProxy.h
+++ b/libs/hwui/renderthread/RenderProxy.h
@@ -73,7 +73,7 @@ public:
     ANDROID_API void setOpaque(bool opaque);
     ANDROID_API int syncAndDrawFrame(nsecs_t frameTimeNanos, nsecs_t recordDurationNanos,
             float density);
-    ANDROID_API void destroyCanvasAndSurface();
+    ANDROID_API void destroy();
 
     ANDROID_API static void invokeFunctor(Functor* functor, bool waitForCompletion);