Keep dex files live in class table

The DexFile.loadClass API allows callers to load classes using a
dex file without having that dex file owned by the specified class
loader. We now add the dex file to the class table to make sure it
stays live until the class loader is unreachable.

Fixes interpreter gcstress test 087 with 64 bit.

Bug: 22720414
Change-Id: Ia4341149f45b6293312f8b275c7a68cea179f718

1 files changed, 11 insertions, 0 deletions

diff --git a/runtime/class_table.cc b/runtime/class_table.cc
index 4b0cbc836c..3ed1c9540d 100644
--- a/runtime/class_table.cc
+++ b/runtime/class_table.cc
@@ -137,4 +137,15 @@ std::size_t ClassTable::ClassDescriptorHashEquals::operator()(const char* descri
   return ComputeModifiedUtf8Hash(descriptor);
 }
 
+bool ClassTable::InsertDexFile(mirror::Object* dex_file) {
+  DCHECK(dex_file != nullptr);
+  for (GcRoot<mirror::Object>& root : dex_files_) {
+    if (root.Read() == dex_file) {
+      return false;
+    }
+  }
+  dex_files_.push_back(GcRoot<mirror::Object>(dex_file));
+  return true;
+}
+
 }  // namespace art