From 4c79fea9efea7cfa739cf5b5f525ddadb28e52a6 Mon Sep 17 00:00:00 2001
From: Andreas Gampe <agampe@google.com>
Date: Thu, 28 Jan 2016 20:11:41 -0800
Subject: [PATCH] Frameworks/base: Stop profiling on uncaught exception

When "handling" an uncaught exception, make an attempt to stop
profiling. In case profiling was active, this will avoid losing
the profiling buffer.

Bug: 26291225
Change-Id: Ie5f5517b46ed89d0456a4aac9d4ff3b713d1d8aa
---
 core/java/android/app/ActivityThread.java          | 10 ++++++++++
 core/java/com/android/internal/os/RuntimeInit.java |  7 +++++++
 2 files changed, 17 insertions(+)

diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index 100e67badb438..99c275cf09a4e 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -4660,6 +4660,16 @@ public final class ActivityThread {
         }
     }
 
+    /**
+     * Public entrypoint to stop profiling. This is required to end profiling when the app crashes,
+     * so that profiler data won't be lost.
+     *
+     * @hide
+     */
+    public void stopProfiling() {
+        mProfiler.stopProfiling();
+    }
+
     static final void handleDumpHeap(boolean managed, DumpHeapData dhd) {
         if (managed) {
             try {
diff --git a/core/java/com/android/internal/os/RuntimeInit.java b/core/java/com/android/internal/os/RuntimeInit.java
index f81658e013442..3b8b7cb2ba2fe 100644
--- a/core/java/com/android/internal/os/RuntimeInit.java
+++ b/core/java/com/android/internal/os/RuntimeInit.java
@@ -86,6 +86,13 @@ public class RuntimeInit {
                     Clog_e(TAG, message.toString(), e);
                 }
 
+                // Try to end profiling. If a profiler is running at this point, and we kill the
+                // process (below), the in-memory buffer will be lost. So try to stop, which will
+                // flush the buffer. (This makes method trace profiling useful to debug crashes.)
+                if (ActivityThread.currentActivityThread() != null) {
+                    ActivityThread.currentActivityThread().stopProfiling();
+                }
+
                 // Bring up crash dialog, wait for it to be dismissed
                 ActivityManagerNative.getDefault().handleApplicationCrash(
                         mApplicationObject, new ApplicationErrorReport.CrashInfo(e));